Self-repairing waterborne epoxy/asphalt compound waterproof coating and preparation method thereof

A self-repairing waterborne epoxy/asphalt composite waterproof coating and its preparation methodTechnical field

[0001] The present invention belongs to the technical field of D coating, and specifically relates to a self-repairing water-based epoxy/asphalt composite waterproof coating and a preparation method thereof.

Background technique

[0002] At present, the main method of preparing self-healing coatings is to add microcapsules (microspheres) with certain functions. When the coating is damaged, the microcapsules are broken, and the chemical properties of the capsule core material are used to achieve the purpose of repairing the damaged coating. The microcapsules are mainly prepared by in-situ polymerization, using epoxy resin, phenolic resin and other polymers as the wall material to wrap the core material with a certain function to achieve the function of self-repair. Traditional self-healing materials have complex raw materials and cumbersome preparation processes, mainly reactive repairing, so the self-repairing time is longer. The self-healing materials are mostly based on inorganic plugging agents, and various additives and polymer materials are used to prepare microcapsules or emulsions. The inorganic plugging agents are used to quickly plug the leakage, and then the polymer materials are used for repair. The plugging is fast, but The composition is relatively complicated and the preparation process is complicated.

[0003] Publication number CN 105820713A discloses "a self-healing coating for marine ships and a preparation method thereof". It mainly uses raw materials such as urea, formaldehyde, epoxy resin, triethanolamine, ammonium chloride, etc., to prepare microcapsules with self-healing ability through in-situ polymerization. The microcapsules are dispersed in epoxy resin paint and coated on the pre-treated steel sheet of the hull structure. The preparation of reactive microcapsules by in-situ polymerization has a complicated process and a slower repair speed for cracks.

[0004] Publication No. CN 103881465A discloses "microcapsules for self-healing coatings, preparation and application". Among them, the microcapsules use urea and formaldehyde as the wall components, and fluorocarbon resin and epoxy resin are mixed as the core components to obtain microcapsules with a particle size ranging from 300μm to 400μm. The prepared microcapsules and water-based fluorocarbon coatings Mixing is used for coating repair. The reaction type microcapsules are also prepared by in-situ polymerization, and self-repair is completed by the chemical reaction of the core material. It is only the change in raw materials that does not solve the problem of complex process and slow self-repair.

[0005] Publication number CN 105174770A discloses "self-healing materials and preparation methods thereof". The self-healing material includes a self-healing agent and a polymer shell encapsulating the self-healing agent, and the self-healing agent includes silica sol. The patent is a concrete restoration material, which is pre-mixed with concrete. The concrete cracks are repaired by the core material containing silica sol. The raw materials are complex, a large amount of surfactants are required to prepare the microcapsules, and the repair speed is slow, which is not conducive to rapid repair. [0006] Publication number CN 104772086A discloses "an epoxy resin microcapsule and its preparation method". Epoxy resin is mainly used as the raw material of the capsule core, and the inorganic particles that adsorb the curing agent are used as the raw material of the capsule wall. By dispersing the capsule core and capsule wall materials in an aqueous solution, under appropriate conditions, the absorption and absorption of inorganic particles by the capsule core material are used. The curing agent initiates a polymerization reaction on the surface of the capsule core to form epoxy microcapsules with epoxy resin film and inorganic particles as the capsule wall components. The microcapsule emulsion is prepared by a large amount of surfactants, and the wall material needs to absorb a considerable amount of curing agent, which increases the difficulty of preparing the microcapsules. It is also a reactive microcapsule and is not conducive to rapid self-repair.

[0007] Publication number CN 102863192A discloses "a waterproof and leak-proofing material with self-repairing function". It is mainly composed of permeable crystalline functional composite materials, sulfoaluminate cement, bentonite and other admixtures and polymer latex powder. First, it uses the rapid plugging function of bentonite, sulfoaluminate cement and other components, and then exerts the self-repairing effect of the permeable crystalline functional composite. The material can quickly plug leaks, but it uses a wide variety of raw materials and complex ratios. It has drawbacks in popularization and manufacturing, and it is not suitable for coatings.

[0008] Publication No. CN 104944872A discloses "Cement concrete pavement self-repairing material and its preparation method". The formula includes: ordinary Portland cement, sulphoaluminate cement, medium sand, redispersible latex powder, silicone defoamer, cyclodextrin, tartaric acid, cellulose ether, slag powder and fly ash. It is only suitable for cement concrete materials, the material composition is more complicated, and the preparation process is complicated. And it is not suitable for the field of coatings.

[0009] The various self-healing coatings (materials) described above mostly use in-situ polymerized microcapsules as a repairing agent for coating damage. In the preparation process of microcapsules, the raw materials are complicated, the preparation process is cumbersome, and the main chemical reaction is Type repair is the main type, requiring the microcapsule core material to react with certain substances to repair the cracks. The repair speed is slow and the waterproof performance is poor. For self-healing materials based on inorganic plugging agents such as bentonite, the later repair also requires the participation of high-molecular polymers. Although the plugging is fast, there are many kinds of raw materials and additives, the preparation is cumbersome, and they are mostly used in specialized areas. Not suitable for coatings.

Summary of the invention

[0010] The purpose of the present invention is to address the drawbacks of the above-mentioned existing self-healing coatings (materials), and to provide a simple raw material and process to prepare a self-healing water-based epoxy/asphalt composite waterproof coating that can quickly plug and waterproof. [0011] Another objective of the present invention is to provide a preparation method of self-repairing water-based epoxy/asphalt composite waterproof coating. [0012] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a self-repairing water-based epoxy/asphalt composite waterproof coating, including the following raw materials in parts by mass:

[0013] 31 to 19 parts of anionic nitrile latex, 35 to 38 parts of anionic emulsified petroleum pitch, 7 to 9 parts of aqueous epoxy emulsion, 7 to 9 parts of aqueous epoxy curing agent, 1.5 to 3.5 parts of talc, defoamer 0.5 part, microcapsule dispersion 18~21;

[0014] The microcapsule dispersion is composed of the following parts by mass of raw materials:

[0015] 36 parts of polyoxypropylene polyol N220, 64 parts of MDI-50, super absorbent, molten paraffin;

[0016] The preparation method of the microcapsule dispersion is completed according to the following steps:

[0017] The first step, the preparation of polyurethane prepolymer: Weigh 36 parts of the above-mentioned mass parts of polyoxypropylene polyol N220 and place them in a reactor, and dehydrate for 2 hours under the conditions of 120°C and -0.09Mpa, After cooling down to 50°C, add 64 parts of MDI-50, warm up to 60°C and react for 1 hour, then warm up to 80°C and react for 2.5 hours, and finally degas under -0.09Mpa vacuum for 1 hour to obtain -NC0 quality Polyurethane prepolymer with a content of 20%;

[0018] The second step is the preparation of superabsorbent microcapsules: the superabsorbent is placed in the polyurethane prepolymer prepared in step 1, soaked and saturated, and then the superabsorbent containing the polyurethane prepolymer is dispersed in In the molten paraffin, the excess molten paraffin is filtered out, and the superabsorbent microcapsules containing polyurethane prepolymer are prepared by atomizing and rapidly cooling in cold air below 10°C.

[0019] The third step, the preparation of the microcapsule dispersion: weigh 100 parts of water and place it in the dispersing equipment, and then add 194~234 parts of paraffin-coated superabsorbent microcapsules containing polyurethane prepolymer in step two, and disperse Uniformly, a microcapsule dispersion with a solid content of 66 to 70% is prepared.

[0020] A method for preparing the self-repairing water-based epoxy/asphalt composite waterproof coating is completed as follows: [00211 19 to 31 parts of the above-mentioned anionic nitrile latex, 35 to 38 parts of anionic emulsified petroleum asphalt, 7-9 parts of water-based epoxy curing agent, 1.5-3.5 parts of talc powder, 0.5 parts of defoaming agent and 18-21 parts of the microcapsule dispersion prepared in step 3 are placed in a container and mixed and stirred evenly, and then the above-mentioned water-based epoxy is added. 7-9 parts of the emulsion are mixed and evenly stirred again to prepare a self-repairing water-based epoxy/asphalt composite waterproof coating.

[0022] The self-repairing water-based epoxy/asphalt composite waterproof coating prepared by the present invention can be used by spraying or brushing, and the thickness of the coating film can be controlled by the number of brushing.

[0023] In a further preferred manner, the anionic nitrile latex is an anionic nitrile emulsion with a solid content of 48 to 52%;

[0024] In a further preferred manner, the anionic emulsified asphalt is an anionic emulsified petroleum asphalt with a solid content of 48 to 52%.

[0025] In a further preferred manner, the water-based epoxy emulsion is a water-based epoxy emulsion with an epoxy value of 0.21-0.23mol/100g and a solid content of 48-52%;

[0026] In a further preferred manner, the water-based epoxy curing agent is a water-based epoxy curing agent with an amine value of 0.22-0.24 mol/100g and a solid content of 48 to 52%.

[0027] In a further preferred manner, the defoamer is an aqueous defoamer.

[0028] In a further preferred manner, the MDI-50 is 4,V-diphenylmethane diisocyanate with a mass fraction of 50% and 2,4 with a mass fraction of 50%.^Z-A mixture of diphenylmethane diisocyanates;

[0029] In a further preferred manner, the polyoxypropylene polyol is a polyoxypropylene polyol N220 with a relative molecular mass of 2000 and a functionality of 2.

[0030] In a further preferred manner, the said superabsorbent is a superabsorbent resin with a particle size of 30-50 microns. [00311 The present invention uses polyoxypropylene polyol N220 and MDI-50 to prepare a polyurethane prepolymer with a mass content of -NC0 of 20%. Take the superabsorbent with a particle size of 30-50 microns as the core material, immerse it in the polyurethane prepolymer to reach saturation, and then disperse the superabsorbent with the polyurethane prepolymer in the paraffin melt, and filter out the excess After the molten paraffin wax is atomized and rapidly cooled in cold air below 10 Ό to form paraffin-wrapped superabsorbent microcapsules containing polyurethane prepolymer, the microcapsules are dispersed in water to form microcapsules containing superabsorbent microcapsules Capsule dispersion components. Finally, the water-based epoxy resin emulsion is mixed with water-based epoxy curing agent, petroleum asphalt emulsion, nitrile emulsion, microcapsule dispersion, fillers, additives, etc., and cured to form a film to form a self-repairing water-based epoxy/asphalt composite Waterproof coating. When the waterproof coating is scratched and cracked during the actual application process, the superabsorbent microcapsules coated in it will be exposed at the same time. When exposed to water or moisture, the superabsorbent microcapsules will quickly absorb water and expand, and the microcapsules The polyurethane prepolymer contained will also react with water to form cross-linked macromolecules such as urea and biuret. As a result, the superabsorbent and the substrate in the crack will be connected together, so as to achieve rapid crack repair and waterproof penetration. The purpose of leaking, play a quick self-repair and waterproof function. The waterproof coating of the present invention can be widely used in fields such as highways, bridges, tunnels, and civil buildings.

[0032] Therefore, compared with the existing technology, the present invention has the following advantages and positive effects:

[0033] First, a self-repairing water-based epoxy/asphalt composite waterproof coating prepared by the present invention. The self-repairing mechanism includes physical and chemical methods. When the waterproof membrane is scratched or punctured, the high water absorption in the microcapsule Resin will rapidly expand when exposed to water to seal the cracks, and then the polyurethane prepolymer contained in the superabsorbent will react with water to form macromolecular chains, which connect the independent superabsorbent particles and the waterproof material base material at the cracks to form a whole network. Structure to achieve a good self-repair purpose.

[0034] Second, a self-repairing water-based epoxy/asphalt composite waterproof coating prepared by the present invention has a fast self-repairing speed for the scratched coating, and the repairing time of 0.5 mm cracks is less than 30s, and the repairing effect is good. After the crack meets with water again, there will be no leakage, and the puncture resistance and self-healing performance are excellent.

[0035] Third, due to the presence of the epoxy resin component, the waterproof coating of the present invention has good adhesion, peel resistance and high elongation at break to concrete and asphalt substrates, which can effectively prevent " The phenomenon of "water channeling" occurs, achieving good waterproof and anti-seepage effects. It also has good temperature resistance, does not move, flow, or bulge at high temperatures, does not crack at low temperatures, and has good flexibility.

[0036] Fourth, the construction is convenient and flexible. It can be constructed by mechanized spraying or manual painting, which is water-soluble.

It has no adverse effects on construction personnel and the surrounding environment, is environmentally friendly, non-toxic, harmless, and environmentally friendly.

Detailed ways

[0037] The specific embodiments of the present invention are described below.

Example 1

[0039] The self-repairing water-based epoxy/asphalt composite waterproof coating described in this embodiment includes the following raw materials in parts by mass:

[0040] 31 parts of anionic nitrile latex, 35 parts of anionic emulsified petroleum pitch, 7 parts of aqueous epoxy emulsion, 7 parts of aqueous epoxy curing agent, 1.5 parts of talc, 0.5 parts of antifoaming agent, 18 of microcapsule dispersions;

[0041] The microcapsule dispersion is composed of the following mass parts of raw materials:

[0042] 36 parts of polyoxypropylene polyol N220, 64 parts of MDI-50, super absorbent, molten paraffin;

[0043] The preparation method of the microcapsule dispersion is completed according to the following steps:

[0044] The first step, the preparation of polyurethane prepolymer: Weigh 36 parts of the above-mentioned mass parts of polyoxypropylene polyol N220 and place them in a reactor, and dehydrate at 120°C and -0.09Mpa for 2 hours, After cooling down to 50°C, add 64 parts of MDI-50, warm up to 60°C and react for 1 hour, then warm up to 80°C and react for 2.5 hours, and finally degas under -0.09Mpa vacuum for 1 hour to obtain -NC0 quality Polyurethane prepolymer with a content of 20%;

[0045] The second step is the preparation of superabsorbent microcapsules: the superabsorbent is placed in the polyurethane prepolymer prepared in step 1, soaked and saturated, and then the superabsorbent containing the polyurethane prepolymer is dispersed in In the molten paraffin, the excess molten paraffin is filtered out, and the superabsorbent microcapsules containing polyurethane prepolymer are prepared by atomizing and rapidly cooling in cold air below 10°C.

[0046] The third step, the preparation of the microcapsule dispersion: weigh 100 parts of water and place it in the dispersing device, and then add 194 parts of paraffin-wrapped polyurethane prepolymer-containing superabsorbent microcapsules in step two, which are uniformly dispersed, A microcapsule dispersion with a solid content of 66% was prepared.

[0047] In this embodiment, a method for preparing the self-repairing water-based epoxy/asphalt composite waterproof coating is completed as follows:

[0048] 31 parts of the above-mentioned anionic nitrile latex, 35 parts of anionic emulsified petroleum pitch, 7 parts of aqueous epoxy curing agent, 1.5 parts of talc, 0.5 parts of antifoaming agent and 18 parts of the microcapsule dispersion prepared in step 3 Place it in a container and mix and stir evenly, then add 7 parts of the above-mentioned water-based epoxy emulsion and mix and stir again to obtain a self-repairing water-based epoxy/asphalt composite waterproof coating.

[0049] The self-repairing waterborne epoxy/asphalt composite waterproof coating prepared by the present invention can be used by spraying or brushing, and the thickness of the coating film can be controlled by the number of brushing.

[0050] The anionic nitrile latex in this embodiment is an anionic nitrile latex with a solid content of 48%;

[00511 The anionic emulsified asphalt in this embodiment is an anionic emulsified petroleum asphalt with a solid content of 49%.

[0052] The water-based epoxy emulsion in this embodiment is a water-based epoxy emulsion with an epoxy value of 0.21mol/100g and a solid content of 50%;

[0053] The water-based epoxy curing agent described in this embodiment is a water-based epoxy curing agent with an amine value of 0.22 mol/100g and a solid content of 49%.

[0054] The defoamer described in this embodiment is BYK-019 water-based defoamer produced by BYK in Germany.

[0055] The MDI-50 described in this embodiment is 4, V-diphenylmethane diisocyanate with a mass fraction of 50%.

2,4 with a volume fraction of 50%^Z-A mixture of diphenylmethane diisocyanates;

[0056] The polyoxypropylene polyol described in this embodiment is a polyoxypropylene polyol N220 with a relative molecular mass of 2000 and a functionality of 2.

[0057] The superabsorbent described in this embodiment is a superabsorbent resin with a particle size of 32 microns.

Example 2

[0059] The self-repairing water-based epoxy/asphalt composite waterproof coating described in this embodiment includes the following raw materials in parts by mass:

[0060] 19 parts of anionic nitrile latex, 38 parts of anionic emulsified petroleum pitch, 9 parts of aqueous epoxy emulsion, 9 parts of aqueous epoxy curing agent, 3.5 parts of talc, 0.5 parts of defoamer, 21 parts of microcapsule dispersion;

[0061] The microcapsule dispersion is composed of the following parts by mass of raw materials:

[0062] 36 parts of polyoxypropylene polyol N220, 64 parts of MDI-50, super absorbent, molten paraffin;

[0063] The preparation method of the microcapsule dispersion is completed according to the following steps:

[0064] The first step, the preparation of polyurethane prepolymer: Weigh 36 parts of the above-mentioned mass parts of polyoxypropylene polyol N220 and place them in a reactor, and dehydrate for 2 hours under the conditions of 120°C and -0.09Mpa, After cooling down to 50°C, add 64 parts of MDI-50, warm up to 60°C and react for 1 hour, then warm up to 80°C and react for 2.5 hours, and finally degas under -0.09Mpa vacuum for 1 hour to obtain -NC0 quality Polyurethane prepolymer with a content of 20%;

[0065] The second step is the preparation of superabsorbent microcapsules: the superabsorbent is placed in the polyurethane prepolymer prepared in step 1, soaked and saturated, and then the superabsorbent containing the polyurethane prepolymer is dispersed in In the molten paraffin, the excess molten paraffin is filtered out, and the superabsorbent microcapsules containing polyurethane prepolymer are prepared by atomizing and rapidly cooling in cold air below 10°C.

[0066] The third step, the preparation of the microcapsule dispersion: weigh 100 parts of water and place it in the dispersing equipment, and then add 234 parts of paraffin-coated superabsorbent microcapsules containing polyurethane prepolymer in step two, and the dispersion is uniform, A microcapsule dispersion with a solid content of 70% was prepared.

[0067] The preparation method of the self-repairing water-based epoxy/asphalt composite waterproof coating described in this embodiment is completed as follows:

[0068] 19 parts of the above-mentioned anionic nitrile latex, 38 parts of anionic emulsified petroleum pitch, 9 parts of aqueous epoxy curing agent, 3.5 parts of talc, 0.5 part of antifoaming agent and 21 parts of the microcapsule dispersion prepared in step 3 Place it in a container and mix and stir uniformly, then add 9 parts of the above-mentioned aqueous epoxy emulsion and mix and stir uniformly again to prepare a self-repairing water-based epoxy/asphalt composite waterproof coating.

[0069] The self-repairing water-based epoxy/asphalt composite waterproof coating prepared by the present invention can be used by spraying or brushing, and the thickness of the coating film can be controlled by the number of brushing.

[0070] The anionic nitrile latex in this embodiment is an anionic nitrile latex with a solid content of 52%;

[00711 The anionic emulsified asphalt in this embodiment is an anionic emulsified petroleum asphalt with a solid content of 50%.

[0072] The water-based epoxy emulsion in this embodiment is a water-based epoxy emulsion with an epoxy value of 0.22mol/100g and a solid content of 48%;

[0073] The water-based epoxy curing agent described in this embodiment is a water-based epoxy curing agent with an amine value of 0.23 mol/100g and a solid content of 50%.

[0074] The defoamer described in this embodiment is BYK-019 water-based defoamer produced by BYK in Germany.

[0075] The MDI-50 described in this embodiment is 4, V-diphenylmethane diisocyanate with a mass fraction of 50%.

2,4 with a volume fraction of 50%^Z-A mixture of diphenylmethane diisocyanates;

[0076] The polyoxypropylene polyol described in this embodiment is a polyoxypropylene polyol N220 with a relative molecular mass of 2000 and a functionality of 2.

[0077] The superabsorbent described in this embodiment is a superabsorbent resin with a particle size of 38 microns.

Embodiment 3

[0079] The self-repairing water-based epoxy/asphalt composite waterproof coating described in this embodiment includes the following raw materials in parts by mass:

[0080] 30 parts of anionic nitrile latex, 35.5 parts of anionic emulsified petroleum pitch, 7 parts of aqueous epoxy emulsion, 7 parts of aqueous epoxy curing agent, 1.5 parts of talc, 0.5 parts of defoamer, 18.5 parts of microcapsule dispersion;

[0081] The microcapsule dispersion is composed of the following mass parts of raw materials:

[0082] 36 parts of polyoxypropylene polyol N220, 64 parts of MDI-50, super absorbent, molten paraffin;

[0083] The preparation method of the microcapsule dispersion is completed according to the following steps:

[0084] The first step, the preparation of polyurethane prepolymer: Weigh 36 parts of the above-mentioned mass parts of polyoxypropylene polyol N220, place them in a reactor, and dehydrate at 120°C and -0.09Mpa for 2 hours, After cooling down to 50°C, add 64 parts of MDI-50, warm up to 60°C and react for 1 hour, then warm up to 80°C and react for 2.5 hours, and finally degas under -0.09Mpa vacuum for 1 hour to obtain -NC0 quality Polyurethane prepolymer with a content of 20%;

[0085] The second step is the preparation of superabsorbent microcapsules: the superabsorbent is placed in the polyurethane prepolymer prepared in step 1, soaked and saturated, and then the superabsorbent containing the polyurethane prepolymer is dispersed in In the molten paraffin, the excess molten paraffin is filtered out, and the superabsorbent microcapsules containing polyurethane prepolymer are prepared by atomizing and rapidly cooling in cold air below 10°C.

[0086] The third step, preparation of microcapsule dispersion: weigh 100 parts of water and place it in the dispersing equipment, and then add 200 parts of paraffin-wrapped polyurethane prepolymer-containing superabsorbent microcapsules in step two, which are uniformly dispersed, A microcapsule dispersion with a solid content of 66.7% was prepared.

[0087] The preparation method of the self-repairing water-based epoxy/asphalt composite waterproof coating described in this embodiment is completed as follows:

[0088] 30 parts of the above-mentioned anionic nitrile latex, 35.5 parts of anionic emulsified petroleum pitch, 7 parts of water-based epoxy curing agent, 1.5 parts of talc, 0.5 parts of antifoaming agent and 21 parts of the microcapsule dispersion prepared in step 3 Place it in a container and mix and stir uniformly, and then add 7 parts of the above-mentioned water-based epoxy emulsion and mix and stir uniformly again, that is, a self-repairing water-based epoxy/asphalt composite waterproof coating is prepared.

[0089] The self-repairing water-based epoxy/asphalt composite waterproof coating prepared by the present invention can be used by spraying or brushing, and the thickness of the coating film can be controlled by the number of brushing.

[0090] The anionic nitrile latex in this embodiment is an anionic nitrile latex with a solid content of 49%;

[00911 The anionic emulsified asphalt in this embodiment is an anionic emulsified petroleum asphalt with a solid content of 48%.

[0092] The water-based epoxy emulsion in this embodiment is a water-based epoxy emulsion with an epoxy value of 0.21mol/100g and a solid content of 49%;

[0093] The water-based epoxy curing agent described in this embodiment is a water-based epoxy curing agent with an amine value of 0.22mol/100g and a solid content of 50%.

[0094] The defoamer described in this embodiment is Haichuan Chemical A-10 water-based defoamer produced by BYK in Germany.

[0095] The MDI-50 described in this embodiment is 4, V-diphenylmethane diisocyanate with a mass fraction of 50%.

2,4 with a volume fraction of 50%^Z-A mixture of diphenylmethane diisocyanates;

[0096] The polyoxypropylene polyol described in this embodiment is a polyoxypropylene polyol N220 with a relative molecular mass of 2000 and a functionality of 2.

[0097] The superabsorbent described in this embodiment is a superabsorbent resin with a particle size of 40 microns.

Embodiment 4:

[0099] The self-repairing water-based epoxy/asphalt composite waterproof coating described in this embodiment includes the following raw materials in parts by mass:

[0100] 27 parts of anionic nitrile latex, 36 parts of anionic emulsified petroleum pitch, 8 parts of aqueous epoxy emulsion, 8 parts of aqueous epoxy curing agent, 1.5 parts of talc, 0.5 parts of antifoaming agent, 18.5 parts of microcapsule dispersion;

[0101] The microcapsule dispersion is composed of the following parts by mass of raw materials:

[01021 36 parts of polyoxypropylene polyol N220, 64 parts of MDI-50, super absorbent, molten paraffin;

[0103] The preparation method of the microcapsule dispersion is completed according to the following steps:

[01041 The first step, preparation of polyurethane prepolymer: Weigh 36 parts of polyoxypropylene polyol N220 of the above-mentioned mass parts and place them in the reactor, dehydrate for 2 hours under the conditions of 120°C and -0.09Mpa, and cool down After reaching 50°C, add 64 parts of MDI-50, heat up to 60Ό and react for 1 hour, then heat up to 80°C for 2.5 hours, and finally degas under -0.09Mpa vacuum condition for 1 hour to obtain -NC0 mass content 20% polyurethane prepolymer;

[0W5] The second step is the preparation of superabsorbent microcapsules: the superabsorbent is placed in the polyurethane prepolymer prepared in step 1, soaked and saturated, and then the superabsorbent containing the polyurethane prepolymer is dispersed in In the molten paraffin, the excess molten paraffin is filtered out, and the superabsorbent microcapsules containing polyurethane prepolymer are prepared by atomizing and rapidly cooling in cold air below 10°C.

[0106] The third step, the preparation of the microcapsule dispersion: weigh 100 parts of water and place it in the dispersing equipment, and then add 210 parts of paraffin-wrapped superabsorbent microcapsules containing polyurethane prepolymer prepared in step 2, and the dispersion is uniform, A microcapsule dispersion with a solid content of 67.7% was prepared.

[0107] The preparation method of the self-repairing water-based epoxy/asphalt composite waterproof coating described in this embodiment is completed as follows:

[01081 Put 27 parts of the above-mentioned anionic nitrile latex, 36 parts of anionic emulsified petroleum pitch, 8 parts of water-based epoxy curing agent, 1.5 parts of talc, 0.5 parts of defoamer and 21 parts of the microcapsule dispersion prepared in step three. Mix and stir uniformly in the container, then add 8 parts of the above-mentioned water-based epoxy emulsion and mix and stir uniformly again to prepare a self-repairing water-based epoxy/asphalt composite waterproof coating.

[0109] The self-repairing water-based epoxy/asphalt composite waterproof coating prepared by the present invention can be used by spraying or brushing, and the thickness of the coating film can be controlled by the number of brushing.

[0110] The anionic nitrile latex in this embodiment is an anionic nitrile latex with a solid content of 50%;

[0111] The anionic emulsified asphalt in this embodiment is an anionic emulsified petroleum asphalt with a solid content of 51%.

[0112] The water-based epoxy emulsion in this embodiment is a water-based epoxy emulsion with an epoxy value of 0.22mol/100g and a solid content of 49%;

[0113] The water-based epoxy curing agent described in this embodiment is a water-based epoxy curing agent with an amine value of 0.23 mol/100 g and a solid content of 51%.

[0114] The defoamer described in this embodiment is Haichuan Chemical A-10 water-based defoamer produced by BYK, Germany.

[0115] The MDI-50 described in this embodiment is 4,V-diphenylmethane diisocyanate with a mass fraction of 50% and a mass fraction of 4,V-diphenylmethane diisocyanate.

2,4 with a volume fraction of 50%^Z-A mixture of diphenylmethane diisocyanates;

[0116] The polyoxypropylene polyol described in this embodiment is a polyoxypropylene polyol N220 with a relative molecular mass of 2000 and a functionality of 2.

[0Ί Π] The partially water-absorbent agent described in this embodiment is a partially water-absorbent resin with a particle size of 42 microns.

Example 5:

[0119] The self-repairing water-based epoxy/asphalt composite waterproof coating described in this embodiment includes the following raw material composition in parts by mass:

[0120] 25 parts of anionic nitrile latex, 36.5 parts of anionic emulsified petroleum pitch, 8 parts of aqueous epoxy emulsion, 8 parts of aqueous epoxy curing agent, 2.5 parts of talc, 0.5 parts of defoamer, 19.5 parts of microcapsule dispersion;

[0121] The microcapsule dispersion is composed of the following mass parts of raw materials:

[0122] 36 parts of polyoxypropylene polyol N220, 64 parts of MDI-50, super absorbent, molten paraffin;

[0123] The preparation method of the microcapsule dispersion is completed according to the following steps:

[0124] The first step, preparation of polyurethane prepolymer: weigh 36 parts of the above-mentioned mass parts of polyoxypropylene polyol N220 and place them in a reactor, and dehydrate at 120°C and -0.09Mpa for 2 hours, After cooling down to 50°C, add 64 parts of MDI-50, warm up to 60°C and react for 1 hour, then warm up to 80°C and react for 2.5 hours, and finally degas under -0.09Mpa vacuum for 1 hour to obtain -NC0 quality Polyurethane prepolymer with a content of 20%;

[0125] The second step is the preparation of superabsorbent microcapsules: the superabsorbent is placed in the polyurethane prepolymer prepared in step 1, soaked and saturated, and then the superabsorbent containing the polyurethane prepolymer is dispersed in In the molten paraffin, the excess molten paraffin is filtered out, and the superabsorbent microcapsules containing polyurethane prepolymer are prepared by atomizing and rapidly cooling in cold air below 10°C.

[0126] The third step, the preparation of the microcapsule dispersion: weigh 100 parts of water and place it in the dispersing equipment, and then add 222 parts of paraffin-coated superabsorbent microcapsules containing polyurethane prepolymer in step two, and the dispersion is uniform, A microcapsule dispersion with a solid content of 68.9% was prepared.

[0127] The preparation method of the self-healing water-based epoxy/asphalt composite waterproof coating described in this embodiment is completed as follows:

[0128] 25 parts of the above-mentioned anionic nitrile latex, 36.5 parts of anionic emulsified petroleum pitch, 8 parts of aqueous epoxy curing agent, 5.5 parts of talc, 0.5 part of antifoaming agent and 19.5 parts of the microcapsule dispersion prepared in step 3 Place it in a container and mix and stir evenly, then add 8 parts of the above-mentioned water-based epoxy emulsion and mix and stir again to obtain a self-repairing water-based epoxy/asphalt composite waterproof coating.

[0129] The self-repairing water-based epoxy/asphalt composite waterproof coating prepared by the present invention can be used by spraying or brushing, and the thickness of the coating film can be controlled by the number of brushing.

[0130] The anionic nitrile latex in this embodiment is an anionic nitrile latex with a solid content of 52%;

[0131] The anionic emulsified asphalt in this embodiment is an anionic emulsified petroleum asphalt with a solid content of 51%.

[0132] The water-based epoxy emulsion in this embodiment is a water-based epoxy emulsion with an epoxy value of 0.23mol/100g and a solid content of 52%;

[0133] The water-based epoxy curing agent described in this embodiment is a water-based epoxy curing agent with an amine value of 0.24 mol/100 g and a solid content of 50%.

[0134] The defoamer described in this embodiment is Haichuan Chemical A-10 water-based defoamer produced by BYK, Germany.

[0135] The MDI-50 described in this embodiment is 4,V-diphenylmethane diisocyanate with a mass fraction of 50%.

2,4 with a volume fraction of 50%^Z-A mixture of diphenylmethane diisocyanates;

[0136] The polyoxypropylene polyol described in this embodiment is a polyoxypropylene polyol N220 with a relative molecular mass of 2000 and a functionality of 2.

[0137] The superabsorbent described in this embodiment is a superabsorbent resin with a particle size of 45 microns.

Example 6:

[0139] The self-repairing water-based epoxy/asphalt composite waterproof coating described in this embodiment includes the following raw material composition in parts by mass:

[0140] 24 parts of anionic nitrile latex, 37 parts of anionic emulsified petroleum pitch, 8 parts of aqueous epoxy emulsion, 8 parts of aqueous epoxy curing agent, 2.5 parts of talc, 0.5 parts of antifoaming agent, 20 parts of microcapsule dispersion;

[0141] The microcapsule dispersion is composed of the following parts by mass of raw materials:

[0142] 36 parts of polyoxypropylene polyol N220, 64 parts of MDI-50, super absorbent, molten paraffin;

[0143] The preparation method of the microcapsule dispersion is completed according to the following steps:

[0144] The first step, the preparation of polyurethane prepolymer: Weigh 36 parts of the above-mentioned mass parts of polyoxypropylene polyol N220, place them in a reactor, and dehydrate for 2 hours under the conditions of 120°C and -0.09Mpa, After cooling down to 50°C, add 64 parts of MDI-50, warm up to 60°C and react for 1 hour, then warm up to 80°C and react for 2.5 hours, and finally degas under -0.09Mpa vacuum for 1 hour to obtain -NC0 quality Polyurethane prepolymer with a content of 20%;

[0145] The second step is the preparation of superabsorbent microcapsules: the superabsorbent is placed in the polyurethane prepolymer prepared in step 1, soaked and saturated, and then the superabsorbent containing the polyurethane prepolymer is dispersed in In the molten paraffin, the excess molten paraffin is filtered out, and the superabsorbent microcapsules containing polyurethane prepolymer are prepared by atomizing and rapidly cooling in cold air below 10°C.

[0146] The third step, the preparation of the microcapsule dispersion: weigh 100 parts of water and place it in the dispersing equipment, and then add 230 parts of paraffin-wrapped superabsorbent microcapsules containing polyurethane prepolymer in step two, and the dispersion is uniform, A microcapsule dispersion with a solid content of 69.7% was prepared.

[0147] The preparation method of the self-repairing water-based epoxy/asphalt composite waterproof coating described in this embodiment is completed as follows:

[0148] Combine 24 parts of the above-mentioned anionic nitrile latex, 37 parts of anionic emulsified petroleum pitch, 8 parts of aqueous epoxy curing agent, 2.5 parts of talc, 0.5 part of antifoaming agent and 20 parts of the microcapsule dispersion prepared in step 3 Place it in a container and mix and stir evenly, then add 8 parts of the above-mentioned water-based epoxy emulsion and mix and stir again to obtain a self-repairing water-based epoxy/asphalt composite waterproof coating.

[0149] The self-repairing waterborne epoxy/asphalt composite waterproof coating prepared by the present invention can be used by spraying or brushing, and the thickness of the coating film can be controlled by the number of brushing.

[0150] The anionic nitrile latex in this embodiment is an anionic nitrile latex with a solid content of 51%;

[0151] The anionic emulsified asphalt in this embodiment is an anionic emulsified petroleum asphalt with a solid content of 51%.

[0152] The water-based epoxy emulsion in this embodiment is a water-based epoxy emulsion with an epoxy value of 0.22mol/100g and a solid content of 50%;

[0153] The water-based epoxy curing agent described in this embodiment is a water-based epoxy curing agent with an amine value of 0.23 mol/100 g and a solid content of 51%.

[0154] The defoamer described in this embodiment is Airex904W water-based defoamer produced by Tego, Germany.

[0155] The MDI-50 described in this embodiment is 4,V-diphenylmethane diisocyanate with a mass fraction of 50%.

2,4 with a volume fraction of 50%^Z-A mixture of diphenylmethane diisocyanates;

[0156] The polyoxypropylene polyol described in this embodiment is a polyoxypropylene polyol N220 with a relative molecular mass of 2000 and a functionality of 2.

[0¹⁵⁷] The partial water-absorbing agent described in this embodiment is a partial water-absorbing resin with a particle size of 48 microns.

Example 7:

[0159] The self-repairing water-based epoxy/asphalt composite waterproof coating described in this embodiment includes the following raw material composition in parts by mass:

[0160] 20 parts of anionic nitrile latex, 37.5 parts of anionic emulsified petroleum pitch, 9 parts of aqueous epoxy emulsion, 9 parts of aqueous epoxy curing agent, 3.5 parts of talc, 0.5 part of defoamer, 20.5 of microcapsule dispersion;

[0161] The microcapsule dispersion is composed of the following parts by mass of raw materials:

[0162] 36 parts of polyoxypropylene polyol N220, 64 parts of MDI-50, super absorbent, molten paraffin;

[0163] The preparation method of the microcapsule dispersion is completed according to the following steps:

[0164] The first step, the preparation of polyurethane prepolymer: Weigh 36 parts of the above-mentioned mass parts of polyoxypropylene polyol N220, place them in a reactor, and dehydrate at 120°C and -0.09Mpa for 2 hours, After cooling down to 50°C, add 64 parts of MDI-50, warm up to 60°C and react for 1 hour, then warm up to 80°C and react for 2.5 hours, and finally degas under -0.09Mpa vacuum for 1 hour to obtain -NC0 quality Polyurethane prepolymer with a content of 20%;

[0165] The second step is the preparation of superabsorbent microcapsules: the superabsorbent is placed in the polyurethane prepolymer prepared in step 1, soaked and saturated, and then the superabsorbent containing the polyurethane prepolymer is dispersed in In the molten paraffin, the excess molten paraffin is filtered out, and the superabsorbent microcapsules containing polyurethane prepolymer are prepared by atomizing and rapidly cooling in cold air below 10°C.

[0166] The third step, the preparation of the microcapsule dispersion: weigh 100 parts of water and place it in the dispersing device, and then add 225 parts of paraffin-wrapped polyurethane prepolymer-containing superabsorbent microcapsules in the second step, and the dispersion is uniform, A microcapsule dispersion with a solid content of 69.2% was prepared.

[0167] The preparation method of the self-repairing water-based epoxy/asphalt composite waterproof coating described in this embodiment is completed as follows:

[0168] Combine 20 parts of the above-mentioned anionic nitrile latex, 37.5 parts of anionic emulsified petroleum pitch, 9 parts of aqueous epoxy curing agent, 3.5 parts of talc, 0.5 part of antifoaming agent and 20.5 parts of the microcapsule dispersion prepared in step 3 Place it in a container and mix and stir uniformly, then add 9 parts of the above-mentioned water-based epoxy emulsion and mix and stir uniformly again to prepare a self-repairing water-based epoxy/asphalt composite waterproof coating.

[0169] The self-repairing water-based epoxy/asphalt composite waterproof coating prepared by the present invention can be used by spraying or brushing, and the thickness of the coating film can be controlled by the number of brushing.

[0170] The anionic nitrile latex in this embodiment is an anionic nitrile emulsion with a solid content of 49%;

[0171] The anionic emulsified asphalt in this embodiment is an anionic emulsified petroleum asphalt with a solid content of 49%.

[0172] The water-based epoxy emulsion in this embodiment is a water-based epoxy emulsion with an epoxy value of 0.21 mol/100g and a solid content of 49%;

[0173] The water-based epoxy curing agent described in this embodiment is a water-based epoxy curing agent with an amine value of 0.22 mol/100 g and a solid content of 51%.

[0174] The defoamer described in this embodiment is Airex 904W water-based defoamer produced by Tego, Germany.

[0175] The MDI-50 described in this embodiment is 4,V-diphenylmethane diisocyanate with a mass fraction of 50% and a mass fraction of 4,V-diphenylmethane diisocyanate.

2,4 with a volume fraction of 50%^Z-A mixture of diphenylmethane diisocyanates;

[0176] The polyoxypropylene polyol described in this embodiment is a polyoxypropylene polyol N220 with a relative molecular mass of 2000 and a functionality of 2.

[0177] The superabsorbent described in this embodiment is a superabsorbent resin with a particle size of 50 microns.

Example 8:

[0179] The self-repairing water-based epoxy/asphalt composite waterproof coating described in this embodiment includes the following raw materials in parts by mass:

[0180] 24 parts of anionic nitrile latex, 35 parts of anionic emulsified petroleum pitch, 8 parts of aqueous epoxy emulsion, 8 parts of aqueous epoxy curing agent, 3.5 parts of talc, 0.5 part of defoamer, 21 of microcapsule dispersion;

[0181] The microcapsule dispersion is composed of the following parts by mass of raw materials:

[0182] 36 parts of polyoxypropylene polyol N220, 64 parts of MDI-50, super absorbent, molten paraffin;

[0183] The preparation method of the microcapsule dispersion is completed according to the following steps:

[0184] The first step, the preparation of polyurethane prepolymer: weigh 36 parts of the above-mentioned mass parts of polyoxypropylene polyol N220 and place them in a reactor, and dehydrate for 2 hours under the conditions of 120°C and -0.09Mpa, After cooling down to 50°C, add 64 parts of MDI-50, warm up to 60°C and react for 1 hour, then warm up to 80°C and react for 2.5 hours, and finally degas under -0.09Mpa vacuum for 1 hour to obtain -NC0 quality Polyurethane prepolymer with a content of 20%;

[0185] The second step is the preparation of superabsorbent microcapsules: the superabsorbent is placed in the polyurethane prepolymer prepared in step 1, soaked and saturated, and then the superabsorbent containing the polyurethane prepolymer is dispersed in In the molten paraffin, the excess molten paraffin is filtered out, and the superabsorbent microcapsules containing polyurethane prepolymer are prepared by atomizing and rapidly cooling in cold air below 10°C.

[0186] The third step, the preparation of the microcapsule dispersion: weigh 100 parts of water and place it in the dispersing equipment, and then add 212 parts of paraffin-wrapped polyurethane prepolymer-containing superabsorbent microcapsules in the second step, which are uniformly dispersed, A microcapsule dispersion with a solid content of 67.9% was prepared.

[0187] The preparation method of the self-healing water-based epoxy/asphalt composite waterproof coating described in this embodiment is completed as follows:

[0188] Combining 24 parts of the above-mentioned anionic nitrile latex, 35 parts of anionic emulsified petroleum pitch, 8 parts of aqueous epoxy curing agent, 3.5 parts of talc, 0.5 part of antifoaming agent and 21 parts of the microcapsule dispersion prepared in step 3 Place it in a container and mix and stir evenly, then add 8 parts of the above-mentioned water-based epoxy emulsion and mix and stir again to obtain a self-repairing water-based epoxy/asphalt composite waterproof coating.

[0189] The self-repairing water-based epoxy/asphalt composite waterproof coating prepared by the present invention can be used by spraying or brushing, and the thickness of the coating film can be controlled by the number of brushing.

[0190] The anionic nitrile latex in this embodiment is an anionic nitrile latex with a solid content of 51%;

[0191] The anionic emulsified asphalt in this embodiment is an anionic emulsified petroleum asphalt with a solid content of 50%.

[0192] The water-based epoxy emulsion in this embodiment is a water-based epoxy emulsion with an epoxy value of 0.23mol/100g and a solid content of 48%;

[0193] The water-based epoxy curing agent described in this embodiment is a water-based epoxy curing agent with an amine value of 0.23 mol/100 g and a solid content of 51%.

[0194] The defoamer described in the present embodiment is Airex904W water-based defoamer produced by Tego, Germany.

[0195] The MDI-50 described in this embodiment is 4,V-diphenylmethane diisocyanate with a mass fraction of 50%.

2,4 with a volume fraction of 50%^Z-A mixture of diphenylmethane diisocyanates;

[0196] The polyoxypropylene polyol described in this embodiment is a polyoxypropylene polyol N220 with a relative molecular mass of 2000 and a functionality of 2.

[0197] The superabsorbent described in this embodiment is a superabsorbent resin with a particle size of 35 microns.

[0198] The self-repairing water-based epoxy/asphalt composite waterproof coating of this embodiment refers to the standard of "JC/T 975-2005 Waterproof Coating for Roads and Bridges", and its various properties are tested as shown in Table 1:

[0199] Table 1. Self-repairing waterborne epoxy/asphalt composite waterproof coating film performance index

[0200]

<td></td><td colspan="2">project name</td><td>Technical index</td>

<td>1</td><td colspan="2">Solid content,/%</td><td></td>

<td>2</td><td colspan="2">Tack-free time/li, 25Γ</td><td>•^e-&gt;4</td>

<td>3</td><td colspan="2">Drying time/h, 25 °C</td><td>ΐί 12</td>

<td>4</td><td colspan="2">Heat resistance/160Ό</td><td>No flow, sliding, dripping</td>

<td>5</td><td colspan="2">4. Permeable M'./O.SMpa, 3Omin</td><td>No water seepage</td>

<td>6</td><td colspan="2">Low temperature flexibility/-20Ό</td><td>No cracks, no breaks</td>

<td>7</td><td colspan="2">Tensile strength/Mpa</td><td>??1.0</td>

<td>8</td><td colspan="2">Elongation at break/%</td><td>2?-800</td>

<td rowspan="4">9</td><td rowspan="4">Fiber</td><td>Tensile strength retention rate/%</td><td></td>

<td>Elongation at break/%</td><td>&gt; 800</td>

<td>Low temperature flexibility/-20Ό</td><td>No cracks, no breaks</td>

<td>Quality increase/%</td><td>^2.0</td>

<td rowspan="5">10</td><td rowspan="5">Heat-must change</td><td>Retention rate of controlled tensile strength/%</td><td></td>

<td>Elongation at break/%</td><td>^600</td>

<td>Low temperature flexibility/-20 °C</td><td>No cracks, no breaks</td>

<td>Heating expansion rate/%</td><td>1.0</td>

<td>Quality increase/%</td><td>ίί 1.0</td>

<td>11</td><td colspan="2">Bonding strength with cement concrete/ Mpa</td><td>0.6</td>

<td>12</td><td colspan="2">Crack self-repair time of about 0.5mm</td><td>s?3(Js</td>