Emulsion paint as well as preparation method and application thereof

Latex paint and its preparation method and application technology field

[0001] The present invention belongs to the field of building materials, and specifically relates to a latex paint and its preparation method and application.

Background technique

[0002] At present, most latex paints on the market do not focus on the absorption and decomposition functions of formaldehyde. A small part of the anti-formaldehyde latex paints have a single anti-formaldehyde mechanism and cannot achieve short-term effective and long-term sustained anti-formaldehyde effects. Moreover, if an emulsion with a low solid content is used for the odor removal effect, the paint film is not water-resistant, has poor water-proof performance, and has insufficient wash resistance, which can easily cause damage to the appearance of the paint film. The main component of latex paint on the market is styrene-acrylic emulsion or other emulsions. Although the existing emulsions used for latex paint have the advantages of alkali resistance, oil resistance, water resistance, heat resistance, good adhesion, and transparent film, they have poor aging resistance. However, it has poor performance, weather resistance and color retention. Therefore, it is necessary to improve the weather resistance and aging resistance of emulsion latex paint. At present, the common methods on the market to improve the weather resistance and aging resistance of interior wall latex paint are to add weather-resistant additives, stabilizers or use colored pigments and fillers. However, this usually affects the overall performance and scope of use of the paint. Therefore, there is an urgent need to pass Other process methods are used to enhance the weathering and aging resistance of latex paint.

Contents of the invention

[0003] In order to overcome at least one technical problem existing in the above-mentioned prior art, one of the purposes of the present invention is to provide a modified titanium dioxide.

[0004] The second object of the present invention is to provide a preparation method of modified titanium dioxide.

[0005] The third object of the present invention is to provide a latex paint.

[0006] The fourth object of the present invention is to provide a preparation method of latex paint.

[0007] The fifth object of the present invention is to provide the application of the above-mentioned modified titanium dioxide and/or latex paint in the decorative field

In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] A first aspect of the present invention provides a modified titanium dioxide, which is titanium dioxide graft-modified by a silane coupling agent and N-aminoethylpiperazine.

Preferably, the modified titanium dioxide includes the following parts by weight of preparation raw materials: 35 to 45 parts of titanium dioxide, 5 to 10 parts of alcohol solution, 5 to 10 parts of silane coupling agent, 5 parts of N-aminoethylpiperazine ~10 parts, catalyst 0.5~2 parts, water 25~35 parts.

[0011] Preferably, the titanium dioxide is rutile titanium dioxide.

[0012] Preferably, the alcohol liquid is a polyol.

[0013] Preferably, the polyol is selected from at least one of ethylene glycol, propylene glycol, glycerin, and butylene glycol.

[0014] Preferably, the catalyst is polyoxyethylene alkyl phenyl ether.

[0015] Preferably, the silane coupling agent is y-glycidoxypropyltrimethoxysilane.

[0016] A second aspect of the present invention provides a method for preparing the modified titanium dioxide provided by the first aspect of the present invention, comprising the following steps:

(1) titanium dioxide, alcohol liquid, silane coupling agent, part of water, catalyst are mixed and reacted to prepare titanium dioxide grafted with silane coupling agent;

The titanium dioxide grafted with the silane coupling agent, N-aminoethylpiperazine, and residual water are mixed and reacted to obtain the

The modified titanium dioxide.

[0019] Preferably, the mixing reaction temperature in step (1) is 50~70°C.

[0020] Preferably, the mixing reaction time in step (1) is 3~10h.

[0021] Preferably, the mixing reaction temperature in step (2) is 70~100°C.

[0022] Preferably, the mixing reaction time in step (2) is 2~5h.

The present invention adopts a semi-continuous synthesis method. First, titanium dioxide with abundant hydroxyl groups on the surface is coupled with a silane coupling agent (for example: γ-glycidyl etheroxypropyltrimethoxysilane, i.e. KH-560 silane coupling agent). agent) to carry out a grafting reaction, and then graft it with N-aminoethylpiperazine (i.e. AEP, which has an amino group and can effectively improve weather resistance), and control the addition amount of catalyst and initiator, reaction temperature and time , optimized the appropriate raw material ratio, and produced a modified titanium dioxide pigment and filler (i.e. modified titanium dioxide) with high grafting rate and stable and good weather resistance.

[0024] The third aspect of the present invention provides a latex paint, including the modified titanium dioxide, diatomite and nanometer titanium dioxide provided in the first aspect of the present invention.

[0025] Preferably, the diatomaceous earth is Celite 499. Diatomite is a microporous material with high specific surface area and excellent physical adsorption capacity. The micropores in diatomite can physically adsorb formaldehyde.

Preferably, the latex paint includes the following components by weight: 3 to 6 parts of diatomite, 22 to 26 parts of modified titanium dioxide, 0.8 to 1.2 parts of nanometer titanium dioxide, 30 to 40 parts of emulsion, and 11 parts of filler ~17 parts, 5.6~12 parts of additives, 14~18 parts of solvent.

[0027] Preferably, the emulsion is selected from at least one of styrene-acrylic emulsion, acetic-acrylic emulsion, tertiary acrylic emulsion, and tert-acetic acid emulsion; further preferably, the emulsion is a styrene-acrylic emulsion.

[0028] Preferably, the nano titanium dioxide is rutile nano titanium dioxide. Nano-titanium dioxide is a nano-titanium dioxide photocatalyst with low odor, low VOC and high catalytic efficiency. It is easily dispersed in water and has good stability. It can catalytically decompose formaldehyde adsorbed on the surface under visible light irradiation, effectively and permanently reducing indoor formaldehyde. content.

Preferably, the styrene-acrylic emulsion is prepared by core/shell copolymerization, and the self-generated seed method is used to synthesize a highly elastic styrene-acrylic emulsion with an inner hydrophilic core, an outer hydrophobic shell, and an inner hard and outer soft structure. , excellent water resistance and wash resistance. Further preferably, the styrene-acrylic emulsion is Rohm and Haas SF 508M.

[0030] Preferably, the filler includes at least one of hydrophobically modified hydroxyethyl cellulose, calcium carbonate, and calcined kaolin.

[0031] Preferably, the filler includes 0.3~0.5 parts of hydrophobically modified hydroxyethyl cellulose. The present invention uses hydrophobically modified hydroxyethyl cellulose to improve the splash resistance and leveling properties of the latex paint.

[0032] Preferably, the hydrophobically modified hydroxyethyl cellulose is Hydraulon Ashland HE10K.

[0033] Preferably, the filler includes 6 to 8 parts of calcium carbonate.

[0034] Preferably, the mesh number of the calcium carbonate is 800~1000 mesh.

[0035] Preferably, the calcium carbonate is calcite powder, which has high whiteness and good fluidity.

[0036] Preferably, the filler includes 5 to 8 parts of calcined kaolin. The invention uses calcined kaolin, and utilizes the characteristics of the calcined kaolin to make the latex paint have good plasticity, adhesion and weather resistance. In addition, the present invention uses calcined kaolin, which can also achieve physical adsorption of formaldehyde gas and further reduce the content of indoor formaldehyde gas.

[0037] Preferably, the filler includes the following components by weight: 0.3~0.5 parts of hydrophobically modified hydroxyethyl cellulose, 6~8 parts of calcium carbonate, and 5~8 parts of calcined kaolin.

[0038] Preferably, the auxiliary agent includes a dispersant, a defoaming agent, a pH regulator, a film-forming auxiliary agent, an anti-freezing and thawing auxiliary agent, and a leveling auxiliary agent.

At least one of an agent, an antifungal agent, a preservative, a covering polymer, and a wetting agent.

[0039] Preferably, the auxiliary agent includes 1.5~2.5 parts of dispersant.

Preferably, the dispersant is a polycarboxylic acid sodium salt dispersant; the polycarboxylic acid sodium salt dispersant has low foaming properties, and can improve the fluidity of the latex paint, and has a stable latex paint slurry Excellent performance in viscosity. Further preferably, the dispersant is Sanopco SN-5040.

[0041] Preferably, the auxiliary agent includes 0.5 to 1.5 parts of defoaming agent.

[0042] Preferably, the defoaming agent is a mineral oil defoaming agent. The foaming agent in the present invention can improve the storage stability of the latex paint, has a fast bubble breaking rate and strong defoaming ability. Further preferably, the defoaming agent is BASF FoamstarST 2410AG.

[0043] Preferably, the auxiliary agent includes 0.2 to 0.4 parts of pH adjuster.

Preferably, the pH regulator is a potassium hydrocarbyl silicate pH regulator, and further preferably, the pH regulator is WACKER BS168. The pH regulator in the present invention is odorless, low VOC, and can be stored Good stability and excellent pH stability.

[0045] Preferably, the auxiliary agent includes 0.3~0.5 parts of film-forming auxiliary agent.

Preferably, the film-forming aid is an alcohol ether film-forming aid, an alcohol ester film-forming aid or a combination thereof, and is further preferably an alcohol ether film-forming aid or an alcohol ester film-forming aid. A low-odor, VOC-free type among alcohol ester film-forming aids; more preferably a low-odor, VOC-free type among alcohol ester film-forming aids; more preferably Dow Coasol 290PLUS, which has low odor and no VO emissions. .

[0047] Preferably, the auxiliary agent includes 0.3~0.5 parts of anti-freezing and thawing auxiliary agent. The anti-freeze and thaw additive in the present invention can improve the freeze-thaw stability of the latex paint and improve the stain resistance of the latex paint. Preferably, the anti-freezing and thawing additive does not contain APE and organic solvents, that is, the anti-freezing and thawing additive is an anti-freezing and thawing additive for water-based coatings.

[0048] Preferably, the anti-freezing and thawing auxiliary agent is a phosphate anti-freezing and thawing auxiliary agent; further preferably, the anti-freeze and thawing auxiliary agent is Rhodia FT-100.

[0049] Preferably, the auxiliary agent includes 0.3~0.5 parts of leveling auxiliary agent.

Preferably, the leveling aid is a water-soluble nonionic associative rheology modifier; the leveling aid used in the present invention can improve the flow and leveling properties of the latex paint, so that the latex paint has excellent Flow and leveling, uniform film-forming properties, gloss development and high thickening efficiency. The leveling aid in the present invention has low odor and does not contain solvents.

[0051] Preferably, the leveling aid is selected from Rohm and Haas RM-8W, Acrysol RM 12W or a combination thereof.

[0052] Preferably, the auxiliary agent includes 0.4 to 0.6 parts of antifungal agent.

Preferably, the antifungal agent is an antifungal agent with diuron as the active ingredient; further preferably, the antifungal agent is Sol ACTICIDE IPW 50, and the antifungal agent in the present invention is formaldehyde-free, Zero VOC, meets environmental protection requirements.

[0054] Preferably, the auxiliary agent includes 0.1 to 0.3 parts of preservatives.

[0055] Preferably, the antifungal agent is a preservative with 1,2-benzisothiazolin-3-one as the active ingredient; further preferably, the antifungal agent is Dow 551S preservative. The antifungal agent has a wide applicable pH range, is completely compatible with the water-based latex paint system of the present invention, can effectively avoid contamination by yeast, mold and other types of microorganisms, does not release any formaldehyde, and does not contain organic halogens and heavy metals.

[0056] Preferably, the auxiliary agent includes 2 to 5 parts of covering polymer.

[0057] Preferably, the covering polymer is selected from hollow polymer microspheres. The covering polymer in the present invention can significantly improve the covering power and wash resistance of the paint film. Further preferably, the covering polymer is Lepa Cool^TMThe Youchuang E.

[0058] Preferably, the auxiliary agent includes the following components by weight: 1.5~2.5 parts of dispersant, 0.5-1.5 part of defoaming agent

parts, 0.2~0.4 parts of pH regulator, 0.3~0.5 parts of film-forming aids, 0.3~0.5 parts of anti-freezing and thawing aids, 0.3~0.5 parts of leveling aids, 0.4~0.6 parts of antifungal agents, 0.1~0.3 parts of preservatives parts, covering polymer 2 to 5 parts.

[0059] Preferably, the wetting agent is an alcoholic nonionic surfactant. The wetting agent used in the present invention is a low-foam, low-odor, APEO-free, low-alcohol nonionic surfactant, which has excellent penetrating power and the ability to reduce surface tension. Further preferably, the wetting agent is Sanopco SN-WET 996.

The latex paint formula in the present invention uses diatomite and nanometer titanium dioxide for compound use. Diatomite has a large amount of microporous structure and high specific surface area, allowing it to absorb formaldehyde in the air more efficiently, and then the formula The nanometer titanium dioxide added can catalytically oxidize and decompose the adsorbed formaldehyde under visible light irradiation. The present invention uses two mechanisms of physical adsorption and chemical catalytic decomposition, and the compound addition of diatomite and nano-titanium dioxide can achieve short-term high-efficiency and long-term sustained anti-formaldehyde effects. In addition, the latex paint in the present invention uses anti-freezing and thawing additives and film-forming aids, preservatives, antifungal agents, emulsions and other ingredients to synergize, making the latex paint green, environmentally friendly and low-odor.

[0061] A fourth aspect of the present invention provides a preparation method for the latex paint provided by the third aspect of the present invention, which includes the following steps: mixing each component of the latex paint to prepare.

[0062] Preferably, the preparation method includes the following steps:

S1: Mix part of the solvent, part of the auxiliary agent, filler, diatomite, nano titanium dioxide, and titanium dioxide to obtain a mixed slurry, the fineness of the mixed slurry does not exceed 50 μm;

S2: After mixing the mixed slurry, remaining solvent, remaining auxiliaries, and emulsion, the latex paint is prepared.

[0065] The fifth aspect of the present invention provides the application of the modified titanium dioxide provided by the first aspect of the present invention and/or the latex paint provided by the third aspect of the present invention in the field of decoration.

The beneficial effects of the present invention are: the modified titanium dioxide in the present invention grafts a silane coupling agent and N-aminoethylpiperazine on titanium dioxide, so that the modified titanium dioxide has excellent oxidation aging resistance and Weather resistance.

The latex paint in the present invention adopts modified titanium dioxide to make it have excellent weather resistance, oxidative aging resistance and excellent storage stability, and by grafting a silane coupling agent and N-aminoethylpiperazine to titanium dioxide and will not adversely affect other properties of latex paint. The present invention uses diatomite and nano-titanium dioxide in combination, and the two work synergistically to achieve short-term and efficient formaldehyde removal and long-term sustained formaldehyde removal. In addition, the synergistic effect between the raw materials in the present invention can make the latex paint have excellent construction properties, weather resistance and aging resistance, storage stability, low temperature resistance, acid and alkali resistance, water resistance and washing resistance, etc., and the When used, latex paint does not emit toxic and harmful gases such as VOC, formaldehyde, and benzene, and does not contain heavy metals. It can achieve low or even no odor, and is environmentally friendly and harmless to the body.

Description of the drawings

[0068] Figure 1 is a process flow chart for the preparation of modified titanium dioxide.

Fig. 2 is the preparation process flow chart of the latex paint in embodiments 1 to 5.

Detailed ways

[0070] The specific implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto. It should be pointed out that any process that is not specifically described in detail below can be implemented or understood by those skilled in the art with reference to the existing technology. If the manufacturer of the reagents or instruments used is not indicated, they are all conventional products that can be purchased commercially.

The raw material information used in the embodiments of the present invention and comparative examples is as follows:

KH-560 is a silane coupling agent, and its chemical name is: γ-glycidyloxypropyltrimethoxysilane; OP-10 is polyoxyethylene alkylphenylaldehyde; Aep is n-aminoethylpiper The titanium dioxide pigment and filler is rutile ultra-fine titanium dioxide, and its trade name is: Lomon R-996. The dispersant is Sanopco SN-5040; the defoaming agent is BASF FoamstarST 2410AG; the burnt kaolin is Super Brand DG-80; the activated diatomite is Celite 499; the modified nano-titanium dioxide is rutile nano-titanium dioxide, purchased from: Ningbo Jiwei Nano New Material Technology Co., Ltd.; the modified hydroxyethyl cellulose is Yaspanlong Ashland HE 10K; the calcium carbonate is 1000 mesh ultra-fine calcite powder from Guangfu Building Materials; the pH regulator is WACKER BS168; Cheng The membrane additive is Dow Coasol290PLUS; the anti-freeze and thaw additive is Rhodia FT-100; the leveling additive is Rohm and Haas RM-8W; the antifungal agent is Sol ACTICIDE IPW 50; the preservative is Dow 551s anti-corrosion The styrene-acrylic emulsion is Rohm and Haas SF 508M; the covering polymer is LepacoolTM Excellent E.

[0073] The formula of the modified titanium dioxide (i.e., titanium dioxide 1, titanium dioxide 2, titanium dioxide 3, titanium dioxide 4, titanium dioxide 5, titanium dioxide 6) used in the embodiment of the present invention is as shown in Table 1 below:

The formula of table 1 modified titanium dioxide (unit: parts by weight)

<td>raw material</td><td>Titanium dioxide 1</td><td>Titanium dioxide 2</td><td>Titanium dioxide 3</td><td>Titanium dioxide 4</td><td>Titanium dioxide 5</td><td>Titanium dioxide 6</td>

<td>Deionized water</td><td>35</td><td>32</td><td>30</td><td>35</td><td>35</td><td>30</td>

<td>Titanium dioxide pigments and fillers</td><td>35</td><td>42</td><td>45</td><td>40</td><td>40</td><td>45</td>

<td>Ethylene glycol</td><td>10</td><td>10</td><td>8</td><td>10</td><td>8</td><td>5</td>

<td>KH-560</td><td>10</td><td>6</td><td>5</td><td>8</td><td>8</td><td>10</td>

<td>0P-10</td><td>2</td><td>2</td><td>2</td><td>2</td><td>2</td><td>2</td>

<td>AEP</td><td>8</td><td>8</td><td>10</td><td>5</td><td>7</td><td>8</td>

<td>total</td><td>100</td><td>100</td><td>100</td><td>100</td><td>100</td><td>100</td>

[0076] Referring to the preparation process flow diagram of modified titanium dioxide in Figure 1, the preparation method of the above-mentioned modified titanium dioxide includes the following steps:

(1) KH560 grafting: a four-necked flask equipped with condenser, stirrer, dripping device and thermometer is placed in a constant temperature water bath, and a certain amount of deionized water, titanium dioxide, ethylene glycol, KH560, Polyoxyethylene alkylphenyl aldehyde (0P-10), heated to 60 °C, dispersed under stirring and allowed the system to fully react for 4 hours. After the reaction, the precipitate was washed with deionized water and filtered.

(2) AEP grafting: Place the four-necked flask equipped with condenser, stirrer, dripping device and thermometer in a constant temperature water bath, add a certain amount of deionized water, wash and filter out The solid precipitation and AEP were heated to 80°C, dispersed under stirring, and allowed to fully react for 3 hours. After the reaction, the precipitate was washed with deionized water, filtered, and dried to obtain modified titanium dioxide.

Observe the appearance of the modified titanium dioxide prepared according to the above formula and preparation process, and use an infrared spectrometer to test the AEP grafting rate of the modified titanium dioxide. The specific test results are as shown in Table 2 below:

[0080] The appearance and grafting rate test results of table 2 modified titanium dioxide

<td>Modified titanium dioxide</td><td>Exterior</td><td>AEP grafting rate (%)</td>

<td>Titanium dioxide 1</td><td>No abnormality</td><td>3.78</td>

<td>Titanium dioxide 2</td><td>No abnormality</td><td>1.74</td>

<td>Titanium dioxide 3</td><td>No abnormality</td><td>0.93</td>

<td>Titanium dioxide 4</td><td>No abnormality</td><td>2.64</td>

<td>Titanium dioxide 5</td><td>No abnormality</td><td>1.91</td>

<td>Titanium dioxide 6</td><td>No abnormality</td><td>0.87</td>

Embodiment 1~5

Embodiments 1 to 5 provide a kind of latex paint respectively, and its formula is shown in Table 3 below respectively:

The formula of the latex paint in table 3 embodiments 1 to 5 (unit: parts by weight)

[0085]

<td>raw material name</td><td>Example 1</td><td>Example 2</td><td>Example 3</td><td>Example 4</td><td>Example 5</td>

<td>water</td><td>183</td><td>16,1</td><td>15.3</td><td>14</td><td>14</td>

<td>Dispersant</td><td>2</td><td>2</td><td>2</td><td>2</td><td>2</td>

<td>Defoaming agent</td><td>1</td><td>1</td><td>1</td><td>1</td><td>1</td>

<td>Burnt kaolin clay</td><td>5</td><td>5</td><td>4</td><td>4</td><td>3</td>

<td>activated diatomaceous earth</td><td>3</td><td>3</td><td>4</td><td>5</td><td>5</td>

<td>Modified nano titanium dioxide</td><td>1</td><td>1</td><td>1</td><td>1</td><td>1</td>

<td>Modified hydroxyethyl cellulose</td><td>0.3</td><td>0.3</td><td>0.4</td><td>0.4</td><td>0.5</td>

<td>Modified titanium dioxide 1</td><td>22</td><td>22</td><td>24</td><td>24</td><td>26</td>

<td>calcium carbonate</td><td>7</td><td>7</td><td>6</td><td>5</td><td>4</td>

<td>pH regulator</td><td>0.4</td><td>04</td><td>0.3</td><td>03</td><td>0.3</td>

<td>Film-forming additives</td><td>0.4</td><td>0.5</td><td>0.4</td><td>04</td><td>0.4</td>

<td>Anti-freeze and thaw additives</td><td>0.4</td><td>05</td><td>0.4</td><td>04</td><td>0.4</td>

<td>Leveling aid</td><td>0.5</td><td>0.5</td><td>0.5</td><td>0.3</td><td>0.3</td>

<td>Antifungal agent</td><td>0.5</td><td>0.5</td><td>0.5</td><td>0.5</td><td>0.5</td>

<td>preservative</td><td>0.2</td><td>0.2</td><td>02</td><td>0.2</td><td>0.2</td>

<td>Styrene acrylic lotion</td><td>33</td><td>35</td><td>36</td><td>37.5</td><td>38.4</td>

[0086]

<td>masking polymer</td><td>5</td><td>5</td><td>4</td><td>4</td><td>3</td>

<td>total</td><td>100</td><td>100</td><td>100</td><td>100</td><td>100</td>

With reference to the preparation process flow chart of the latex paint in Figure 2, the latex paint in Examples 1 to 5 is prepared by the following preparation method, and the specific steps are:

premixing stage: add part of the water, start the disperser, adjust the rotation speed to 700r/min, and add the dispersant and part of the defoaming agent, stir for 1 min, add the fired kaolin, activated diatomite, modified Stir the nano titanium dioxide for 2 minutes, then add modified hydroxyethyl cellulose, adjust the speed to 1200r/min, then add modified titanium dioxide 1 and calcium carbonate in sequence, and adjust the height and speed of the disperser while adding the powder. As well as the feeding speed, ensure that the powder does not accumulate. After feeding the powder, add the pH regulator and adjust the rotation speed to 1500r/min. Disperse at high speed for 15 minutes and then take a sample to check the fineness. When the fineness is below 50μ1n

, you can proceed to the next step;

Thinning stage: adjust the rotating speed to 900r/min, add film-forming aids, anti-freezing and thawing aids, preservatives, leveling aids, styrene-acrylic emulsion, remaining defoaming agent and remaining water in sequence, and stir In 5 minutes, the basic performance test of the finished product can be carried out. After passing the test, the latex paints in Examples 1 to 5 are respectively prepared.

[0090] Performance test:

(1) Main technical index test

[0092] According to the detection items and detection methods recorded in the following table 4, respectively test whether the latex paint in embodiments 1 to 5 meets the requirements of the main technical indicators, and the specific test results are as shown in table 5.

[0093]

Table 4 main technical index test items and test methods

<td>Test items</td><td>standard</td><td>Detection method</td>

<td>status in container</td><td>Stir and mix without lumps; in a uniform state</td><td>GB/T 9756-2018</td>

<td>Constructability</td><td>The second construction road is barrier-free</td><td>GB/T 9756-2018</td>

<td>Paint film appearance</td><td>normal</td><td>GB/T 9756-2018</td>

<td>Drying time (surface dry/h)</td><td>W2</td><td>GB/T 1728-2020</td>

<td>Contrast ratio (%)</td><td>Three 0.95</td><td>GB/T 9756-2018</td>

<td>Water resistance (96h)</td><td>No abnormality</td><td>GB/T 9265-2009</td>

<td>Alkali resistance (48h)</td><td>No abnormality</td><td>GB/T 1733-1993</td>

<td>Low temperature stability</td><td>Does not deteriorate</td><td>GB/T 9266-2008</td>

<td>Low temperature film forming property</td><td>No abnormality in film formation at 5°C</td><td>GB/T 9756-2018</td>

<td>Washing resistance</td><td>6000 times</td><td>GB/T 9756-2018</td>

Test results of main technical indicators of latex paint in Table 5 Examples 1 to 5

[0095]

[0096]

<td>Test items</td><td>standard test</td><td>Example 1</td><td>Example 2</td><td>Example 3</td><td>Example 4</td><td>Example 5</td>

<td>status in container</td><td>Stir and mix without lumps: uniform state</td><td>Stir and mix without any lumps: in a uniform state</td><td>Stir and mix without any lumps: in a uniform state</td><td>Stir and mix without lumps: uniform state</td><td>Stir and mix without lumps: uniform state</td><td>Stir and mix without lumps; in a uniform state</td>

<td>Constructability</td><td>Barrier-free construction</td><td>Barrier-free construction</td><td>Barrier-free construction</td><td>Barrier-free construction</td><td>Barrier-free construction</td><td>Barrier-free construction</td>

<td>Paint film appearance</td><td>normal</td><td>normal</td><td>normal</td><td>normal</td><td>normal</td><td>normal</td>

<td>Drying time (surface dry a1)</td><td>&lt;2</td><td>2.0</td><td>2.0</td><td>2.0</td><td>2.0</td><td>2.0</td>

<td>Contrast ratio (%)</td><td>&gt;95</td><td>95.7</td><td>955</td><td>96.0</td><td>95.7</td><td>963</td>

<td>Water resistance (96h)</td><td>No abnormality</td><td>No abnormality</td><td>No abnormality</td><td>No abnormality</td><td>No abnormality</td><td>No abnormality</td>

<td>Alkali resistance (48 h)</td><td>No abnormality</td><td>No abnormality</td><td>No abnormality</td><td>No abnormality</td><td>No abnormality</td><td>No abnormality</td>

<td>Low temperature stability</td><td>Does not deteriorate</td><td>Does not deteriorate</td><td>Does not deteriorate</td><td>Does not deteriorate</td><td>Does not deteriorate</td><td>Does not deteriorate</td>

<td>Low temperature film forming property</td><td>5.0 film formation without abnormality</td><td>5.0 film formation without abnormality</td><td>5.0 film formation without abnormality</td><td>5-7 film formation without abnormality</td><td>5. (2 There is no abnormality in film formation</td><td>5-7 film formation without abnormality</td>

<td>Washing resistance</td><td>&gt;6000 times</td><td>&gt;6500</td><td>&gt;6500</td><td>&gt;7000</td><td>&gt;7ϋϋϋ</td><td>&gt;7500</td>

[0097] As can be seen from Table 5, the latex paints in Examples 1 to 5 of the present invention have excellent stability, construction performance, water resistance, alkali resistance, low temperature resistance, washing resistance and other properties.

(2) Environmental performance test

According to the inspection items and test methods recorded in the following table 6, the environmental performance indicators such as VOC, benzene, toluene, free formaldehyde and other volatile gases, heavy metals and other environmental performance indicators in the latex paint in Examples 1 to 5 are detected respectively. The specific test results are as follows As shown in Table 6.

Table 6 environmental performance testing items and testing methods

[0101]

<td>Test items</td><td>GB18582-2008 limited value</td><td>Detection method</td><td>Example 1 to Example 5</td>

<td>Volatile organic compounds (CVOC) aldehydes</td><td>&lt;120</td><td>GB/T20284-2006</td><td>None of them inspected the mountain</td>

<td>Sum of waste, toluene, ethylbenzene and xylene (mg/KG)</td><td>&lt;300</td><td>GB/T23990-2009</td><td>None were detected</td>

<td colspan="2">Free formaldehyde (mg/KG)</td><td>&lt;100</td><td>GB/T23990-2009 was not detected</td>

<td rowspan="4">Heavy metals (mg/KG)</td><td>soluble lead</td><td>&lt;90</td><td>GB/T23991-2009 was not detected</td>

<td>Soluble cadmium</td><td>&lt;75</td><td>No towels checked</td>

<td>Soluble chromium</td><td>&lt;60</td><td>None were detected</td>

<td>nJ'soluble mercury</td><td>&lt;60</td><td>None were detected</td>

[0103] As can be seen from Table 6, the latex paints in Examples 1 to 5 of the present invention do not contain components such as VOC, benzene, toluene, ethylbenzene, xylene, formaldehyde, heavy metals, etc. that are harmful to the environment.

Weather resistance and aging resistance performance test

[0105] According to the detection items and detection methods recorded in the following table 7, the artificial weather aging resistance and coating temperature change resistance of the latex paint in Examples 1 to 5 were tested respectively. The specific test results are as shown in the following table 8.

[0106] Table 7 weather resistance and aging resistance performance test requirements

<td>Test items</td><td>standard</td><td>Detection method</td>

<td>Resistance to artificial weathering - white and light colors</td><td>No blistering, peeling, or cracking for 600 hours</td><td>GB/T 9755-2014</td>

<td>Coating resistance to temperature degeneration (3 cycles)</td><td>No abnormality</td><td>GB/T 9755-2014</td>

The weather resistance and aging resistance test results of the latex paint in table 8 embodiments 1 to 5

<td>Test item B</td><td>standard</td><td>Example 1</td><td>Example 2</td><td>Example 3</td><td>Example 4</td><td>Example 5</td>

<td>Resistance to artificial weathering - white and light colors</td><td>No blistering, peeling, or cracking for 600 hours</td><td>600</td><td>600</td><td>650</td><td>650</td><td>700</td>

<td>Coating resistance to temperature degeneration (3 cycles)</td><td>No abnormality</td><td>No abnormality</td><td>No abnormality</td><td>No abnormality</td><td>No abnormality</td><td>No abnormality</td>

[0110] As can be seen from Table 8, the latex paint in Examples 1 to 5 has excellent weather resistance and aging resistance, specifically: it can be without blistering, falling off, or cracking for more than 600h during the artificial weather aging resistance test. And after three coatings of temperature change resistance, the paint film showed no abnormalities.

Wil] Formaldehyde resistance performance test

[0112] Take the finished latex paint prepared in Examples 1 to 5 as a test sample, and conduct formaldehyde resistance test respectively. The specific test method is: apply an equal amount of latex paint to the inner wall of the sealed test glass box, and then set the same amount of latex paint in the box. In an initial formaldehyde concentration environment of 0.8 mg/h1, the short-term (7 days) and long-term (30 days) formaldehyde concentrations were tested respectively. The specific test results are shown in Table 9: [0113] Latex paint in Examples 1 to 5 of Table 9 Anti-formaldehyde performance test results

<td>Test items</td><td>Example 1</td><td>Example 2</td><td>Example 3</td><td>Example 4</td><td>Example 5</td>

<td>Formaldehyde content (25°C, 7 days)</td><td>0.61mg/m³</td><td>0.63mg/m³</td><td>0.57mg/m³</td><td>0.53mg/m³</td><td>0+53mg/n?</td>

<td>Formaldehyde content (25°C, 30 days)</td><td>0.23mg/m^J</td><td>0.23mg/m³</td><td>0.24mg/m³</td><td>0,23 mg/m³</td><td>0₊23mg/m³</td>

As can be seen from Table 9, the latex paint in Examples 1 to 5 of the present invention has short-term and long-term continuous formaldehyde removal effects, and the short-term formaldehyde absorption effect is related to the amount of active diatomite, and the long-term formaldehyde absorption effect is related to modified nanometer titanium dioxide. Related.

[0116] The use of modified titanium dioxide 2-5 in the latex paint of the present invention can achieve basically the same technical effect as the use of modified titanium dioxide 1.

[0117] To sum up, the latex paint in the present invention has excellent stability, construction performance, water resistance, alkali resistance, low temperature resistance, washing resistance and other properties, and in terms of environmental protection performance, various harmful substances are "undetected" "out", which is far lower than the limit value in the GB 18582-2008 standard, and in terms of weather resistance and aging resistance, it can reach the technical indicators of excellent products in the artificial weather aging resistance of exterior wall latex paint, and has the ability to continuously remove formaldehyde in the short and long term. The effect can achieve "clean smell" in the construction site, reduce environmental pollution, and be more environmentally friendly.

[0118] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-described embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various modifications can be made without departing from the purport of the present invention. kind of change. In addition, the embodiments of the present invention and the features in the embodiments may be combined with each other without conflict.