JP2002173642A - Stainproof painting agent composition for surface of structure and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stainproof painting agent composition capable of exhibiting hydrophilicity and stainproof property directly after the painting on the surface of a structure without needing an acid treatment or the like, excellent in storage stability, drying property and handleability, and capable of forming paint film excellent in adhesivity and transparency, and having good appearance, and to provide a method for manufacturing the composition. SOLUTION: An organo silicate of the general formula 1 (wherein, R is a 1-10C hydrocarbon group; and n is an integer of >=1) is hydrolyzed in the presence of an acid catalyst so that the amount of hydrolyzing water is 60-600 pts.wt. based on 100 pts.wt. of the Si in the organo silicate in terms of SiO2, and a water-containing diluent is added to the obtained hydrolyzate so that the water content after the adjustment is 600-4,000 pts.wt. based on 100 pts.wt. of the Si in the organo silicate in terms of SiO2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition for preventing contamination of a surface of a structure used for preventing the surface of the structure from being stained. The present invention relates to a coating composition for preventing contamination of a surface of a structure, which is applied to a surface of the structure to prevent the surface of the structure from being contaminated as much as possible by soot and exhaust gas, and a method for producing the same.

[0002]

2. Description of the Related Art Pollutants such as smoke and exhaust gas adhere to the surface of structures such as buildings, especially painted surfaces of buildings that are constantly exposed to pollution sources such as smoke and exhaust gas outdoors. Also, if these pollutants adhere to the painted surface of the building, they will flow out during rainfall and appear as black streaks on the painted surface, significantly impairing the appearance of the painted surface of the building. is there.

Therefore, conventionally, as a method for preventing such contamination of the painted surface of a building as much as possible, a fluorine-based coating agent obtained by adding an alkyl silicate or a condensate thereof to a hydrophobic fluororesin paint is used. It has been proposed (JP-A-8-120211, JP-A-8-120212,
JP-A-8-176,304).

[0004] However, these fluorine-based coating agents can improve the contamination to some extent by adding an alkyl silicate or a condensate thereof, but the surface exhibits hydrophilicity due to the highly hydrophobic fluororesin paint. It takes a long time to complete the process, the antifouling resistance in the initial stage after the formation of the coating film is low, rain streaks easily adhere in the very early stage, and the contamination of the painted surface of the building cannot be completely prevented. For this reason, it must be said that the expectation of pollution prevention is temporarily disappointed.

[0005] Recently, it has been found that it is more effective to make the material more water-friendly (hydrophilic) for the purpose of low-contamination and non-contamination (published on February 10, 1995). Monthly Building Materials News, pp. 18-19). The reason is that the hydrophilic coating has a lower electric resistance and is harder to be charged, so it is difficult for dirt and dirt to adhere, and even if dirt or dirt adheres, it does not easily fit into the coating, so it is difficult to enter the coating, When rainwater hits, dirt is replaced by rainwater and flows down.

[0006] As a method for obtaining such a hydrophilic coating film, an undercoat is applied, and an organosilicate and / or a condensate thereof is blended with an organic silicon-curable solvent-based coating on the undercoat. A method has been proposed in which an overcoating material having a contact angle of water of 70 ° or less on the surface of a cured coating film after treatment is applied and then cured (JP-A-7-136,584).
And Japanese Patent No. 2,869,443). However, in this method, in order to impart hydrophilicity to the top coat, the surface of the cured coating film after application must be subjected to an acid treatment, which causes a problem that the number of treatment steps increases and the cost increases.

Further, as a method for preventing contamination caused by dust and oily components on the surface of the overcoat film, an organosilicate is coated on the surface of the structure in the presence of an acid catalyst in terms of the conversion of Si atoms in the organosilicate to SiO _{2 in} terms of SiO _2. It has also been proposed to apply a hydrolysis reaction product obtained by hydrolysis with 3 to 70 parts by weight of water with respect to parts by weight (JP-A-7-13).
No. 6,583). However, in this method,
Due to the small amount of water used for hydrolysis, the alkoxy group remains in the obtained hydrolyzate, and even if it is hydrolyzed with moisture in the air with the passage of time after coating, hydrophilicity may be obtained, Immediately after coating, hydrophilicity cannot be obtained, and as a result, a sufficient effect of preventing contamination may not be obtained.

[0008]

Accordingly, the present inventors have provided hydrophilicity to the surface of a cured coating film without the need for such acid treatment, and provided excellent stain resistance to the surface of the structure. As a result of intensive studies on a coating composition for preventing contamination of the surface of the structure that can be exerted, the organosilicate is hydrolyzed with water that does not gel in the presence of a hydrolysis catalyst, and then the obtained hydrolysis reaction is performed. The moisture control composition, which is obtained by diluting the product with a water-containing diluent and adjusting the water content to a predetermined level, exhibits hydrophilicity immediately after painting and exhibits excellent stain resistance, as well as storage stability and drying properties. They have found that they have excellent handleability and that they can form a coating film with good appearance as well as excellent adhesion and transparency to the cured coating film, and completed the present invention.

It is therefore an object of the present invention, immediately after the coating on the structure surface without the need for special processing of the acid treatment or the like can be rendered hydrophilic, thereby stain with excellent structural surface While being able to demonstrate the nature,
At the same time, it has excellent storage stability and drying properties, is excellent in handling, and has excellent adhesion and transparency, and can form a good-looking coating film. An object of the present invention is to provide a coating composition.

Another object of the present invention is to impart hydrophilicity to a surface of a structure immediately after coating without requiring special treatment such as acid treatment, and to provide stain resistance, storage stability, and the like. handling, and to provide a manufacturing method of adhesion, and infection preventive coating composition of the structure surface is excellent in transparency can be formed a good coating film appearance.

[0011]

That is, the present invention provides a compound represented by the following general formula (1):

Embedded image (Wherein, R represents a hydrocarbon group having 1 to 10 carbon atoms, and may be the same or different from each other;
n shows the integer of 1 or more. The organosilicate represented by) in the presence of a hydrolysis catalyst relative terms of SiO ₂ to 100 parts by weight of the organosilicate in Si atom 60-6
After hydrolyzing with water having a hydrolysis water content of 00 parts by weight and adding a water-containing diluent to the obtained hydrolysis reaction product, the water content is adjusted to 10% of SiO _{2 in} terms of Si atoms in the organosilicate.
It is a coating agent composition for preventing contamination of the surface of a structure, wherein the water content is adjusted to be in a range of 600 to 4000 parts by weight with respect to 0 parts by weight, and the obtained water adjusting composition is contained as a main component. The present invention is also a method for producing such a coating composition for preventing contamination of the surface of a structure.

In the present invention, examples of the organosilicate represented by the general formula (1) include an alkyl group, an allyl group, and an aryl group as the hydrocarbon group R. More specifically, for example, an alkyl group As methyl, ethyl, n-propyl, iso-propyl, n-butyl, is
o-butyl group, tert-butyl group, n-pentyl group, iso-pentyl group, neo-pentyl group, n-hexyl group, iso-hexyl group, etc., and allyl groups such as phenyl group, toluyl group, xylyl group, and naphthyl And a vinyl group as the aryl group. Among them, an alkyl group having 1 to 4 carbon atoms is particularly preferable from the viewpoint of easy hydrolysis.

In the above organosilicate, even if it is a monomer of n = 1, n = 2 to 2
Even condensate 10, further it may be a mixture thereof.

The coating composition for preventing contamination according to the present invention is characterized in that the organosilicate is hydrolyzed in the presence of a hydrolysis catalyst in an amount of from 60 to 600 parts by weight of hydrolyzed water based on 100 parts by weight of Si atoms in terms of SiO ₂ in the organosilicate. After the addition of a water-containing diluent to the resulting hydrolysis reaction product, the water content is adjusted to the Si content of the Si atoms in the organosilicate.
Moisture is adjusted to be in the range of 600 to 4000 parts by weight with respect to 100 parts by weight in terms of O ₂ , and the obtained water adjusting composition is the main component.

Here, the amount of hydrolyzed water used to hydrolyze this organosilicate is 60 parts per 100 parts by weight of Si atoms in the organosilicate in terms of SiO _2.
"-600 parts by weight" is not less than the theoretical amount at which the organosilicate can be completely hydrolyzed, and is such an amount that the obtained hydrolysis reaction product does not gel, preferably 12 parts by weight.
The amount is preferably from 0 to 400 parts by weight. If the amount of the hydrolyzed water is less than 60 parts by weight, the hydrolysis does not proceed sufficiently, and a problem that desired hydrophilicity cannot be obtained occurs. Conversely, if the amount of the hydrolyzed water is more than 600 parts by weight, the hydrolyzate tends to gel. Is not preferred. The amount of hydrolyzed water refers to the total amount of water present in the reaction system when hydrolyzing the organosilicate, and is not limited to water added as a reactant to the hydrolysis reaction system. It refers to the total amount of water including water introduced into the reaction system together with the hydrolysis catalyst or together with the reaction solvent.

The hydrolysis catalyst used in the hydrolysis reaction of the organosilicate is not particularly limited, but is preferably a mineral acid such as nitric acid, sulfuric acid, hydrochloric acid or phosphoric acid, or a formic acid,
Acid catalysts such as organic acids such as acetic acid. The amount of the hydrolysis catalyst used is, for example, in the case of an acid catalyst, usually 0.01 to 5% by weight, preferably 0.05 to 2% by weight in the reaction system. On the contrary, when the amount exceeds 5% by weight, the hydrolysis reaction product is liable to gel, and the control of the reaction becomes difficult.

Further, in the hydrolysis reaction of the organosilicate, it is preferable to use a reaction solvent which can dissolve the organosilicate and water in the reaction system with each other.
The reaction solvent is not particularly limited as long as it can dissolve both of them. However, in view of handling properties at the time of coating, alcohols are preferable, and specific examples thereof include ethyl alcohol and iso-propyl alcohol. And butyl alcohol. The amount of this reaction solvent used is
The amount is usually 100 to 3000 parts by weight, preferably 200 to 2000 parts by weight, based on 100 parts by weight of Si atoms in the organosilicate in terms of SiO _2.
If the amount is more than 10 parts by weight, the reaction will be insufficient and the reaction rate will be slow.

After the hydrolysis reaction product obtained by this hydrolysis reaction is added with a water-containing diluent and adjusted to have a water content of 600 to 4000 parts by weight based on 100 parts by weight of Si atoms in the organosilicate in terms of SiO _2. Parts, preferably 10
00-3500 parts by weight, more preferably 1500-30
The water content is adjusted so as to be within the range of 00 parts by weight, and the obtained water content adjusting composition is used as the main component of the coating composition for preventing contamination of the structure surface of the present invention. Here, if the water content after the adjustment is less than 600 parts by weight, there is a problem that the alkoxy group is finally left and desired hydrophilicity cannot be obtained, and if it is more than 4000 parts by weight, the storage stability becomes poor. There is a problem that the product life is shortened and the product life is shortened.

The water-containing diluent used for the water content adjustment is not particularly limited as long as it can dissolve the hydrolysis reaction product and water with each other, but an organic solvent-water system is preferably used. As the solvent, alcohols, especially ethyl alcohol, iso-propyl alcohol,
Butyl alcohol and the like are preferred. Further, the coating composition of the present invention, for the purpose of adjusting the viscosity or drying speed of the coating film as necessary, ethyl alcohol, isopropyl alcohol, alcohols such as butyl alcohol,
Other solvents such as a solvent having a high viscosity and a solvent having a high boiling point may be added.

The surface of a structure to which the coating composition for preventing contamination of the present invention is applied includes, for example, surfaces of inorganic materials such as concrete, fiber reinforced concrete, slate and glass, acrylic resins, fluororesins, polyurethane resins, and the like. A film molded from a resin such as polyester resin, polycarbonate resin, vinyl chloride resin, polyethylene resin,
Surface of organic materials such as resin molded products such as sheets and rubber products, surface of metal materials such as aluminum, iron, stainless steel, zinc steel plate and steel plate, and surface of organic-inorganic composite materials such as organic-inorganic composite materials such as fiber-reinforced resin In addition, on the surface of these inorganic materials, organic materials, and organic-inorganic composite materials, a coating layer selected from a fluororesin paint, a polyurethane resin paint, an acrylic resin paint, a polyester resin paint, and an aqueous resin paint is provided in advance. Painted surface and the like. The surface of these structures may be directly coated with the coating composition of the present invention, or may be coated after being subjected to a surface treatment such as a primer or after undercoating.

The coating composition for preventing pollution of the present invention is used, for example, for building exterior panels, tents, waterproof sheets, windshield sheets, building sheets, roofing materials, skylights, concrete walls, water storage tanks, tanks, shutters, and sashes. Dirt on various outdoor goods such as building members such as building exterior walls, guard rails, pedestrian bridges, exterior panels, translucent boards, soundproof walls, signs, side walls of expressways, tunnel walls, railway viaducts, bridges, and other road members. By coating on a place where the occurrence is easy, it is possible to prevent the occurrence of dirt for an extremely long time.

The coating composition for preventing contamination of the present invention can be easily applied by a usual coating method, for example, by brush coating, roller coating, spray coating, flow coater, gravure coater, or spin coating. .
Also, the drying method may be room temperature or may be heated,
A dried film can be obtained in a shorter time by heating.

Although the coating composition for preventing contamination of the present invention contains a large amount of water, the reason why the hydrolysis reaction product stably exists without gelling is not necessarily clear, When the organosilicate is completely hydrolyzed, and the organosilicate is previously hydrolyzed with reaction water to such an extent that the hydrolysis reaction product does not gel, and polycondensed, the hydrolysis product formed by the reaction in the hydrolysis reaction product Is dispersed in a water-containing solvent in a spherical colloidal state, and when a large amount of water is added thereto, the hydrolysis reaction product in the colloidal state initially undergoes a polymerization reaction to form a polymer, It is considered that this polymer is hydrolyzed by an equilibrium reaction with a large amount of water, and as a result, it is present relatively stably despite the presence of a large amount of water.

[0024]

The present invention will be specifically described below based on examples and comparative examples. Example 1 In a 500 ml three-necked flask, an oligomer of ethyl silicate (trade name: ES-4, manufactured by Tama Chemical Industry Co., Ltd.)
0, average polymerization degree 4-5) 40 g and ethanol 88 g were charged and uniformly mixed, and 21.6 g of pure water and 28 g of 6 wt% -nitric acid as a catalyst were added thereto, and the mixture was reacted under heating and reflux for 4 hours. After cooling, a hydrolysis reaction product (first reaction product) was obtained.

Next, a water-containing diluent obtained by sufficiently stirring and mixing 190 g of isopropyl alcohol and 430 g of pure water was added to the obtained first reaction product, and further mixed by stirring. A coating composition was obtained.

Example 2 Methyl silicate oligomer (trade name: MS, manufactured by Tama Chemical Industry Co., Ltd.) was used instead of ES-40 in the first reaction solution.
A coating composition of Example 2 was prepared in the same manner as in Example 1, except that 31.4 g of -51, average degree of polymerization 3 to 4) was added.

Example 3 A coating composition of Example 3 was prepared in the same manner as in Example 1 except that 272 g of pure water in the water-containing diluent was used.

Example 4 A coating composition of Example 4 was prepared in the same manner as in Example 1 except that the amount of pure water in the water-containing diluent was changed to 112 g.

Example 5 Example 1 was repeated except that the amount of pure water in the water-containing diluent was changed to 48 g.
In the same manner as in the above, a coating composition of Example 5 was prepared.

Comparative Example 1 40 g of ES-40 was placed in a 1500 ml three-necked flask.
88 g of ethanol, 190 g of isopropyl alcohol, and 650 g of pure water were charged and uniformly mixed, and then 28 g of 6 wt% -nitric acid was added. The mixture was reacted under heating and reflux for 4 hours, but the reaction solution gelled on the way.

Comparative Example 2 Unlike the water-containing diluent used in Example 1, except that only 19 g of isopropyl alcohol was used as the diluent.
A coating composition of Comparative Example 2 was prepared in the same manner as in Example 1.

[Test Results / Verification of Example] Example 1 above
Each coating composition of Comparative Examples 2 to 5 and Comparative Example 2 was verified.
The storage stability was as follows: the coating composition was sealed in a container, kept at a temperature of 40 ° C. for 3 months, returned to room temperature, and observed in the container. ◎: No change was observed. :
It was evaluated in four stages: slightly white, Δ: turbid white, and ×: gelled. Further, the coating composition was applied on a glass plate, and the drying property, the transparency, and the appearance were visually observed. Drying properties ◎: 1 hour after completely dry-deposited, and ×: 1 hour after without drying and film forming was evaluated in two stages, also the transparency, ◎: clear after 1 hour △: Slightly whitish after 1 hour, ×: Whitish after 1 hour, and evaluated as 3 grades. Coating appearance: 外 観: Completely formed after 1 hour, and ×: One hour later, the powder was evaluated without drying or film formation.
Table 1 shows the above results.

[0033]

[Table 1]

Further, as shown in Table 2, on a substrate, an aluminum plate, a PVC plate, or a polycarbonate plate to which a solvent fluororesin paint, a solvent polyurethane resin paint, a baked fluororesin paint, and a baked polyester resin paint were applied, respectively. The coating compositions of Examples 1 to 6 and Comparative Example 2 were applied at a rate of 0.03 kg / m ² to prepare test pieces of Examples 1 to 5 and Comparative Example 2.

With respect to the test pieces obtained in Examples 1 to 5 and Comparative Example 2, the painted surfaces were exposed outdoors, and an outdoor exposure test was performed. Evaluation of dirt by this outdoor exposure test
The difference in brightness after exposure and before exposure after 6 months △ was L ^*.
The measurement of this lightness difference is performed by a colorimeter (C
R-300), ◎: -2 or more, ：: -2 to -5,
Δ: -5 to -8 and ×: -8 were evaluated based on the following criteria.
It should be noted that the brightness difference ΔL * indicates that the larger the numerical value, the less the stain.

The initial contact angle before outdoor exposure was measured as the degree of hydrophilicity. The contact angle was measured by dropping 0.02 cc of deionized water onto the painted surface and using a contact angle measuring device (trade name: CONTACT-ANGLE manufactured by Kyowa Chemical Co., Ltd.).
The contact angle of a water droplet was measured at 20 ° C. using a METER CA-A type). Table 2 shows the results of these three-point average values.

[0037]

[Table 2]

As is clear from the results in Tables 1 and 2, the coating compositions obtained in Examples 1 to 5 were coated with the coating composition obtained by using the coating composition. The dirt is replaced by the rainwater and flows down, and the contamination resistance is exhibited for a long period of time, so that the contamination of the structure surface can be effectively prevented.

Comparative Example 3 In a 2000 ml three-necked flask, 40 g of the same ethyl silicate oligomer as used in Example 1, 88 g of ethanol and 190 g of isopropyl alcohol were charged and uniformly mixed. 6wt
%-Nitric acid 28g was added and reacted under heating and reflux for 4 hours.
After cooling, a hydrolysis reaction product (coating agent composition) having a water content of 3,000 parts by weight based on 100 parts by weight of SiO _{2 in} terms of Si atoms in the organosilicate was finally obtained.

Comparative Example 4 The same methyl silicate oligomer used in Example 2 was used in place of the ethyl silicate oligomer.
A coating composition of Comparative Example 4 was prepared in the same manner as in Comparative Example 3 except that 4 g of the coating composition was used. Finally, the water content was 3000 parts by weight based on 100 parts by weight of Si atoms in the organosilicate in terms of SiO _2. did.

Comparative Example 5 In the same manner as in Comparative Example 3, except that the amount of pure water used was changed to 293 g, the final water content was 2,000 parts by weight based on 100 parts by weight of Si atoms in the organosilicate in terms of SiO _2. Was prepared.

[Test Results / Verification of Example] Example 1 above
Each of the coating agent compositions of Comparative Examples 3 to 5 and Comparative Examples 3 to 5
Adhesion, initial hydrophilicity (contact angle), 3 months before outdoor exposure
Coating appearance, hydrophilicity (contact angle) was evaluated after further 6
Evaluation of appearance and stain of coating film before and after outdoor exposure for one month (brightness difference
L ^*), Hydrophilicity (contact angle) was verified. The results are shown in Table 3.
You.

At this time, outdoor exposure, contact angle and lightness difference ΔL
The measurement of ^* and the evaluation of the appearance of the coating film were carried out by coating a solvent fluororesin paint (paint A; trade name: Atomseflon H) or solvent polyurethane resin paint (paint B; trade name: Atomix product name: Lifetex #) on the substrate. 70) is 3
The composition was applied under the condition of a single coating of 0 μm to form a coated surface, and the coating composition of each of Examples 1 to 3 and Comparative Examples 3 to 5 was applied on the coated surface at a rate of 0.03 g / m ^2. each example 1
3 and Comparative Examples 3 to 5 were prepared and performed.

As for the adhesion, each of the above Examples 1 to 5 was used.
JIS K5400 for the test pieces of Comparative Examples 3 to 5 and Comparative Examples 3 to 5.
Measured by the X-cut tape method according to 5.3, 10: No peeling was observed, 8: No peeling was observed at the intersection, and slight peeling was observed at the X-cut part, 6: Intersection of the X-cut part From 1.5mm or less in any direction is recognized,
4: Peeling of 1.5 mm or more and 3.0 mm or less is observed in any direction from the intersection of the X cuts. 2: Peeling is observed in most of the X cuts, 0: Compared with the X cuts The evaluation was made from the viewpoint of large peeling.

In the outdoor exposure test, as shown in FIG. 1, a test piece having an inclined surface of 45 ° at the top and a vertical surface at the bottom (the angle between the vertical surface and the inclined surface: 135)
°) was prepared, and the appearance of the coating film was evaluated on a vertical surface, and the contamination of the coating film was evaluated on an inclined surface. The appearance of the coating film after this outdoor exposure was visually observed, ◎: no rain streaks were observed at all, ○: thin rain streaks were partially observed, Δ: clear rain streaks were partially observed, X: Evaluation was made in four steps: rain streaks were observed on the entire surface.

[0046]

[Table 3]

[0047]

Industrial Applicability The coating composition for preventing contamination of the present invention can impart hydrophilicity to the surface of a structure immediately after coating without requiring special treatment such as acid treatment. While exhibiting excellent contamination resistance on the surface,
At the same time, it has excellent storage stability and drying properties, is excellent in handleability, and is excellent in adhesion and transparency, and can form a coating film with good appearance.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the shape of a test piece used for evaluating the appearance of a coating film and stains on the coating film in an outdoor exposure test.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hideo Sekiguchi 12-1, Ekimae Honcho, Kawasaki-ku, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture, 17th floor of Tower Reverk, Kawasaki Station, inside Tama Chemical Industry Co., Ltd. (72) Katsuyuki Miyazato Tokyo 3-9-6 Funato, Itabashi-ku, Atomics Inc. (72) Inventor Hideo Tateno 3-9-6, Funato, Itabashi-ku, Tokyo, Atomics Inc. (72) Inventor Ichiro Ishikawa 3-, Funato, Itabashi-ku, Tokyo 9-6, Atomics Inc. F term (reference) 4J038 DL021 KA06 LA02 NA01 NA05 NA12 PB05 PC02 PC03 PC04 PC08

Claims (6)

[Claims] [Claim 1] The following general formula (1) (Wherein, R represents a hydrocarbon group having 1 to 10 carbon atoms, and may be the same or different from each other;
n shows the integer of 1 or more. The organosilicate represented by) in the presence of a hydrolysis catalyst relative terms of SiO ₂ to 100 parts by weight of the organosilicate in Si atom 60-6
After hydrolyzing with water having a hydrolysis water content of 00 parts by weight and adding a water-containing diluent to the obtained hydrolysis reaction product, the water content is adjusted to 10% of SiO _{2 in} terms of Si atoms in the organosilicate.
A coating composition for preventing contamination of the surface of a structure, wherein the water content is adjusted to be in a range of 600 to 4000 parts by weight with respect to 0 parts by weight, and the obtained water adjusting composition is contained as a main component. . 2. The amount of hydrolyzed water introduced into the hydrolysis reaction system is 1 in terms of SiO _{2 in} terms of Si atoms in the organosilicate.
The coating composition according to claim 1, wherein the amount is 120 to 400 parts by weight based on 00 parts by weight. 3. The water content after the adjustment is S in the organosilicate.
1000 to 100 parts by weight of i-atom in terms of SiO ₂
The coating composition for preventing surface contamination of a structure according to claim 1 or 2, which is 3500 parts by weight. 4. The structure according to claim 1, wherein the surface of the structure has a coating layer selected from a fluororesin coating, a polyurethane resin coating, an acrylic resin coating, a polyester resin coating and an aqueous resin coating. A coating composition for preventing contamination of an object surface. 5. The structure according to claim 1, wherein the base material is formed of any material selected from metal, glass, enamel, ceramics, concrete, wood, and plastic.
5. The coating composition for preventing contamination of a surface of a structure according to any one of items 4 to 4. 6. The following general formula (1): (Wherein, R represents a hydrocarbon group having 1 to 10 carbon atoms, and may be the same or different from each other;
n shows the integer of 1 or more. The organosilicate represented by) in the presence of a hydrolysis catalyst relative terms of SiO ₂ to 100 parts by weight of the organosilicate in Si atom 60-6
After hydrolyzing with water having a hydrolysis water content of 00 parts by weight and then adding a water-containing diluent to the obtained hydrolysis reaction product, the water content is adjusted to 100 parts by weight of Si atoms in the organosilicate in terms of SiO _2. A method for producing a coating composition for preventing surface structure contamination, comprising adjusting the water content to be in the range of 600 to 4000 parts by weight with respect to the water content, and incorporating the obtained water content adjusting composition as a main component.