Coating agent composition

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention is used as a treatment agent for the outer wall and inner wall of buildings and structures, especially for concrete surfaces, or as a coating agent for shoji surface, and is used for preventing the generation of black mold, deodorizing, waterproofing, sterilizing, etc., and molds and algae in water. The present invention relates to a coating agent composition capable of preventing the growth of mold and suppressing the growth of grass.

【0002】

[Conventional technology]

Generally, as a chemical agent for preventing the generation of black mold or the like, a water-soluble organic or inorganic fungicide or the like is used. This chemical agent such as an antifungal agent permeates into the outer wall from the surface of the outer wall of a building or a structure to prevent the generation of black mold or the like.

【0003】

On the other hand, as a chemical agent that adsorbs an odorous component such as methyl mercaptan in a refrigerator, a deodorant such as activated carbon is used.

【0004】

[Problems to be Solved by the Invention]

However, since the conventional fungicide is water-soluble, it has a great effect, but since it is water-soluble, it may flow out due to rainwater or the like, so it is necessary to spray the fungicide on a regular basis. It was extremely costly.

【0005】

Further, since the conventional deodorant only adsorbs an odor component on the porous activated carbon, when the saturated adsorption amount is reached after a certain period of time, the deodorizing effect is not achieved and it is necessary to replace it regularly. there were.

【0006】

[Means for solving problems]

The present invention has been proposed in view of the above-mentioned conventional drawbacks, and relates to a coating agent composition characterized by mixing fine granular transparent titanium oxide of 1 μm or less with a resin emulsion.

【0007】

BEST MODE FOR CARRYING OUT THE INVENTION

First, each component of the finely granular transparent titanium oxide of 1 μm or less and the resin emulsion used in the present invention will be described.

【0008】

The finely granular transparent titanium oxide having a size of 1 μm or less is titanium dioxide having a photocatalytic reaction function, and is not titanium dioxide having a unit of several μm that has been conventionally used for applications such as pigments. As for this transparent titanium oxide, ultrafine particles of 0.005 to 0.1 μm are already widely and stably supplied to the market. When this transparent titanium oxide is exposed to ultraviolet rays, it is separated into electrons (-) and holes (+), and the formed holes change oxygen in the air into active oxygen (OH radicals), and this active oxygen is said to be persistent. Carbon dioxide (CO)₂ ) And water or hydrogen. That is, transparent titanium oxide is an n-type semiconductor and causes a photochemical reaction when irradiated with light having an energy of bandgap (anatase: 3.2eV, rutile 3.0eV) or more (antase is 387 nm or less, rutile is ultraviolet light of 413 nm or less). , Electron-hole pairs are generated, and electrons move to the inside and holes move to the surface. The holes react with a small amount of water on the surface to generate hydroxyl radicals with strong oxidizing power. The photocatalytic action of this transparent titanium oxide allows the reaction to proceed sufficiently if there is light energy equivalent to that of the sun's rays, and the effect is maintained semipermanently.

【0009】

The finely granular transparent titanium oxide also has a function of decomposing the black mold that has already propagated on the outer wall surface of the structure to purify the outer wall surface, and decomposes organic substances that are nutrients for the black mold to cause the black mold. Suppresses the growth of. In addition, weed seeds are prevented from germinating from the outer wall surface of the structure, and the growth of germinated plant buds is suppressed by a photocatalytic oxidation reaction. Since this transparent titanium oxide is not water-soluble, its effect is maintained semi-permanently even if it is exposed to rainwater or the like as in the conventional antifungal agent, or even if it is not sprayed regularly.

【0010】

Since the dilute water is water, the resin emulsion does not have to worry about fire (compared to many flammable organic solvents), has low toxicity, does not have the unpleasant odor of organic solvents, and dries quickly. The coating film has the characteristics of high alkali resistance and high water vapor permeability. Specifically, for example, a vinyl acetate-based (ethylene-vinyl acetate copolymer system or a vinyl chloride-vinyl acetate copolymer-based copolymer) is preferable. ) Emulsion, styrene-butadiene emulsion, acrylic emulsion and the like can be appropriately selected and used. In general, vinyl acetate (copolymerization) emulsions are excellent in water resistance, water wash resistance, etc., styrene-butadiene emulsions are excellent in alkali resistance and water resistance, and have low permeability, and acrylic emulsions are weather resistant. It has the characteristics of being excellent in properties and abrasion resistance, but it may be appropriately selected according to the object to be coated and the application.

【0011】

The resin emulsion is basically in a state of containing fine bubbles, and when the object is coated with an appropriate thickness, the water content, which is the dispersion medium (solvent) of the emulsion, evaporates. Since fine continuous voids in units of μm are generated, the function of the fine granular transparent titanium oxide is exhibited.

【0012】

Various additives and the like may be added to the coating composition of the present invention containing the above two components as basic components, if necessary. For example, for the purpose of imparting high antibacterial properties to the object to be coated, a silver-based inorganic antibacterial agent incorporating silver may be blended inside the crystal such as zeolite having an ion exchange function, calcium phosphate, zirconium phosphate or the like. However, activated carbon may be added or any other component may be used in combination for the purpose of imparting a high deodorizing effect to the object to be coated. For example, when zeolite or activated carbon having fine voids and adsorbability is blended, adsorbed organic substances, odorous components, bacterial cells, molds, algae, etc. can be decomposed, and antibacterial effect, deodorizing effect, and cleaning effect can be obtained. Etc. are all dramatically improved by the synergistic effect of the combined use. Moreover, although the adsorbent usually loses its adsorbing ability when it reaches the saturation amount, the transparent titanium oxide decomposes the organic substances adsorbed by the adsorbent one after another, so that it is not necessary to replace the adsorbent regularly.

【0013】

Further, in the coating agent composition of the present invention, when the slurry in which the fine-grained transparent titanium oxide is uniformly mixed with the resin emulsion is prepared, the fine-grained transparent titanium oxide is uniformly dispersed without being agglomerated. If the above is taken into consideration, it can be prepared (manufactured) extremely easily with a general emulsification disperser without any particularly difficult process and without using a special device.

【0014】

Furthermore, the coating agent composition of the present invention may be coated on any object by any known method. For example, the surface of zeolite or activated carbon may be coated as an object, or the surface of white granules (stone or the like) having high light reflection may be coated. However, after coating the coating agent composition, it is desirable to perform a drying treatment at a temperature of 70 ° C. or lower, for example, room temperature. When dried at a temperature of 70 ° C or higher, the resin in the resin emulsion softens and melts due to heat even if continuous voids are formed, covering the surface of fine-grained transparent titanium oxide, and the effects such as antibacterial properties are fully exhibited. It disappears.

【0015】

The components constituting the coating agent composition of the present invention, the preparation method, and the film forming method thereof have been described above, but various functions of the coating agent composition of the present invention will be described below.

【0016】

First, it can be used for antibacterial treatment. The transparent titanium oxide contained in the coating composition of the present invention has a very strong oxidizing power as described above, and therefore has high antibacterial properties against methicillin-resistant Staphylococcus aureus (MRSA), Escherichia coli, and Pseudomonas aeruginosa. Has.

【0017】

It can also be used for deodorizing treatment. Since the transparent titanium oxide contained in the coating agent composition of the present invention has a deodorizing function, a deodorizing device that combines a honeycomb-shaped activated carbon surface coated with the coating agent composition of the present invention and a lamp fan or the like. Can be used to remove odorous components such as methyl mercaptan in the refrigerator. In this method, the odor component is first adsorbed on the activated carbon, and when ultraviolet rays and heat rays are applied to the activated carbon, the odor can be desorbed and decomposed by photodeodorization. This deodorizing device is also effective for acetaldehyde, which is a typical indoor odor, and can also be applied to room air conditioners and air purifiers.

【0018】

Furthermore, it can also be used for decomposing marine spilled oil. For example, when the coating agent composition of the present invention is coated on the glass surface and exposed to the marine outflow oil, the crude oil adsorbed on the titanium oxide surface can be oxidatively decomposed and removed.

【0019】

It can also be used to purify the atmosphere. The coating agent composition of the present invention is coated on the surface of a sheet-like molded product in which activated carbon as an adsorbent and a small amount of iron oxide are kneaded into a porous fluororesin to prepare highly volatile trichloroethylene, tetrachloroethylene, etc. When a persistent underground pollutant is gasified and acted on, it can be decomposed by the strong oxidizing power of iron oxide, and nitrogen oxides in the atmosphere also become nitric acid on the surface of titanium oxide and can be removed by washing with water.

【0020】

In addition, it can also be used to purify water. By coating the surface of activated carbon with the coating composition of the present invention, halomethane in tap water and organic halogens, phenols, ethylene glycols, and polyvinyl alcohols in wastewater can be removed by decomposition instead of adsorption on activated carbon. Although it is difficult to decompose the above-mentioned organic substances by a usual method, the strong oxidizing power of titanium oxide enables these oxidative decompositions.

【0021】

[Example]

500 parts by weight of all-acrylic type one-component crosslinked emulsion, 125 parts by weight of fine-grained transparent titanium oxide (average particle size 0.007 μm), and antibacterial agent (zeolite with ion exchange function, calcium phosphate, zirconium phosphate, etc. inside the crystal 20 parts by weight of a silver-based inorganic antibacterial agent incorporating silver) and 500 parts by weight of water were mixed to prepare a uniform mixed slurry.

【0022】

The mixed slurry (coating agent composition) was spray-painted on the surface of the hardened tile to form a thin film of 1 μm or less and dried at 65 ° C. In the antibacterial test, 0.5 ml of bacterial solution (MRSA, Escherichia coli, green pus) was dropped onto the sample, cultured under fluorescent light at 37 ° C for 24 hours, and then the bacterial solution was sterilized with phosphate buffer. Was washed out, and the viable cell count in the washed out test solution was measured by the dilution plate method using a medium for measuring the number of bacteria. 10 at the start of the test⁵ An order of viable cell counts was confirmed, but not detected after 24 hours. That is, a high antibacterial effect was confirmed.

【0023】

[Effect of the invention]

As described above, since the coating agent composition of the present invention contains fine-grained transparent titanium oxide of 1 μm or less, it can be used for prevention of black mold generation, deodorization, sterilization and the like.

【0024】

Further, since the fine granular transparent titanium oxide of 1 μm or less used in the present invention is not water-soluble, it does not flow out even when it is used for exposure to rainwater, or it is used for preventing the growth of mold and algae in water. Can also be used.

【0025】

Furthermore, since fine-grained transparent titanium oxide of 1 μm or less is an inorganic substance, it is highly safe, and unlike various adsorbents, it does not have a saturated amount, so it does not need to be replaced regularly and is semi-permanent. The effect can be maintained, and its practical value is extremely high.

【0026】

Moreover, when various adsorbents are blended in the coating agent composition of the present invention, organic substances, odorous components, bacterial cells, molds, algae, etc. adsorbed by the adsorbent can be decomposed by transparent titanium oxide, resulting in antibacterial effect and deodorization. Both the effect and the cleaning effect are dramatically improved by the synergistic effect of the combined use. Further, although the adsorbent usually loses its adsorbing ability when it reaches the saturation amount, it is not necessary to replace the adsorbent regularly because the transparent titanium oxide decomposes the organic substances adsorbed by the adsorbent one after another.