JP2008101219A - Method for imparting anti-fogging property - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydrophilic coating technique which can offer anti-fogging properties with maintaining water resistance and wear resistance without irradiating UV rays from the initial stage after the film-making. <P>SOLUTION: The method comprises coating the surface of a substrate with a hydrophilic coating material composition comprising a silicone resin and an organo-zirconium compound. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hydrophilic coating material composition having antifogging properties and a coated product thereof.

A coating film obtained from a coating containing a silicone resin composed of a tetrafunctional alkoxide hydrolyzate and / or a partial hydrolyzate and an inorganic filler has a low contact angle with water and exhibits antifogging properties and high wear resistance. It is known. Moreover, according to patent document 1, after apply | coating a coating material, higher anti-fogging property is acquired by hardening at the baking temperature of 250-350 degreeC.
Furthermore, coating films obtained by applying and curing a coating containing a silicone resin as a main component and containing an optical semiconductor can be expected to have the following various effects and are applied to various substrates.

When light (ultraviolet light) having an excitation wavelength (for example, 400 nm) hits an optical semiconductor, active oxygen capable of oxidatively decomposing organic matter is generated. Therefore, the surface of the base material is coated with a coating containing the optical semiconductor. Is a self-cleaning effect that decomposes carbon-based soil components adhering to the surface (for example, carbon fractions contained in automobile exhaust gas and cigarette dust); malodorous components typified by amine compounds and aldehyde compounds Deodorizing effect that degrades; antibacterial effect that prevents the generation of bacterial components typified by Escherichia coli and Staphylococcus aureus; In addition, when UV light hits a material coated with a coating containing a photo semiconductor on the surface of the base material, the photo semiconductor acts as a hydroxyl radical on the moisture in the air or on the surface of the material by photocatalysis. Hydroxyl radicals decompose and remove organic substances (such as those attached to the material surface and those contained in the material surface) that repel water, thereby reducing the contact angle of water with the material surface and reducing the surface of the material. There is also an effect of improving hydrophilicity (water wettability), which makes it easy to get wet with water (familiarity). From this hydrophilicity-improving effect, the indoor member is expected to have an anti-fogging effect in which glass and mirrors are not easily fogged by water droplets, and the outdoor member is expected to have an anti-fouling effect in which attached dirt is washed away by rainwater. In addition, a material obtained by coating the surface of a base material with a coating containing an optical semiconductor also has an antistatic function due to the photocatalytic action of the optical semiconductor.
JP 2001-146573 A

  However, the above prior art has the following problems. That is, when the silicone resin is mainly composed of a tetrafunctional silicone resin, the hydrophilicity may be insufficient in the initial stage after film formation. When a photo-semiconductor is contained, the photocatalyst is applied after irradiation with ultraviolet rays. Since it takes a certain amount of time for the action to be exerted, the time until the effect of the photocatalytic action is exerted after film formation is not hydrophilic, and it is difficult to become hydrophilic in indoor places where there is no exposure to ultraviolet rays. It was difficult to use. Moreover, in the technique of the said patent document 1, since it is necessary to bake at the temperature of 250-350 degreeC, when apply | coating to a base material with low heat resistance, it cannot be heated, such as apply | coating to the outer wall of a building There is a problem that it cannot be applied when applied to a place.

  Accordingly, an object of the present invention is to provide a hydrophilic coating material composition capable of exhibiting antifogging properties without being irradiated with ultraviolet rays from the initial stage after film formation while maintaining water resistance and abrasion resistance equal to or higher than those of the above-described conventional techniques. And providing its paint.

In order to solve the above problems, the present inventor has made various studies. As a result, if the following specific organometallic compound is blended with the silicone resin, it can be tested that antifogging properties can be exhibited without ultraviolet irradiation from the initial stage of coating formation without reducing water resistance, abrasion resistance, etc. The hydrophilic coating composition and hydrophilic coating product of the present invention were completed.
In the present invention, “hydrophilic” means excellent hydrophilicity from the beginning.
The hydrophilic coating material composition according to claim 1 of the present invention contains a silicone resin and an organic Zr compound.
The hydrophilic coating material composition according to claim 2 of the present invention is the hydrophilic coating material composition according to claim 1 of the present invention, wherein the organic Zr compound is ZrO _n R ¹ _m (OR ² ) _p . It is a compound represented.
(Here, R ¹ and R ² represent the same or different monovalent organic groups or hydrogen atoms, p is an integer of 1 to 4, n is 0 or 1, and 2n + m + p = 4.)
The hydrophilic coating material composition according to claim 3 of the present invention is the hydrophilic coating material composition according to claim 1 of the present invention, wherein the organic Zr compound is Zr (C ₅ H ₇ O ₂ ) ₄ . .

The hydrophilic coating material composition according to claim 4 of the present invention is the hydrophilic coating material composition according to claim 1 of the present invention, wherein the organic Zr compound is Zr (OC ₄ H ₉ ) (C ₅ H). ₇ O ₂ ) (C ₆ H ₉ O ₃ ) ₂ .
The hydrophilic coating material composition according to claim 5 of the present invention is the hydrophilic coating material composition according to any one of claims 1 to 4 of the present invention, wherein the organic Zr compound is mixed with the hydrophilic coating material composition. It is contained in an amount of 0.1 to 30% by weight based on the total solid content.
The hydrophilic coating material composition according to claim 6 of the present invention contains the inorganic filler in the hydrophilic coating material composition according to any one of claims 1 to 5 of the present invention.

The hydrophilic coating material composition according to claim 7 of the present invention is the hydrophilic coating material composition according to claim 6 of the present invention, wherein the inorganic filler is an optical semiconductor.
The hydrophilic coating material composition according to an eighth aspect of the present invention is the hydrophilic coating material composition according to the seventh aspect of the present invention, wherein the optical semiconductor is anatase TiO ₂ .
The hydrophilic coating product according to claim 9 of the present invention includes a coating layer comprising a coating-cured film of the hydrophilic coating material composition according to any one of claims 1 to 8 of the present invention on the surface of the substrate. .

The hydrophilic coating material composition of the present invention exhibits antifogging properties without ultraviolet irradiation from the initial stage after film formation.
Since the hydrophilic coated product of the present invention includes a coating layer composed of a coating-cured film of the hydrophilic coating material composition of the present invention described above, it exhibits antifogging properties without ultraviolet irradiation from the initial stage after film formation.

Silicone resin, which is one of the essential components of the hydrophilic coating material composition of the present invention, is a component used as a binder resin and a film-forming component.
The form of the silicone resin is not particularly limited, and may be, for example, a solution or a dispersion.
The silicone resin is a (partial) hydrolyzate of a hydrolyzable organosilane generally represented by the following formulas (1) to (3). In the present specification, “(partial) hydrolysis” means “partial hydrolysis and / or hydrolysis”.
Si (OR) ₄ (1)
R ¹ Si (OR) ₃ (2)
(R ¹ ) ₂ Si (OR) ₂ (3)
R in the formulas (1) to (3) is not particularly limited as long as it is a monovalent hydrocarbon group, but is preferably a monovalent hydrocarbon group having 1 to 8 carbon atoms, such as a methyl group or an ethyl group. And alkyl groups such as propyl group, butyl group, pentyl group, hexyl group, peptyl group and octyl group. Among these alkyl groups, those having 3 or more carbon atoms may be linear such as n-propyl group, n-butyl group, etc., isopropyl group, isobutyl group, t-butyl group. It may have a branch such as a group. R ¹ in the formulas (2) and (3) is not particularly limited as long as it is a monovalent hydrocarbon group, but is not limited to methyl, ethyl, propyl, butyl, pentyl, hexyl, peptyl. In addition to alkyl groups such as a group and octyl group, for example, γ-glycidoxypropyl group and the like are also exemplified.

Examples of the hydrolyzable organosilane represented by the formula (1) include tetramethoxysilane, tetraethoxysilane, tetra n-propoxysilane, tetraisopropoxysilane, and tetra-t-butoxysilane.
Examples of the hydrolyzable organosilane represented by the formula (2) include γ-glycidoxypropyltrimethoxysilane.
Examples of the hydrolyzable organosilane represented by the formula (3) include γ-glycidoxypropylmethyldimethoxysilane.
Only one type of hydrolyzable organosilane may be used, or two or more types may be used in combination.

A silicone resin is prepared by, for example, adding a necessary amount of water as a curing agent and, if necessary, a catalyst or the like to a hydrolyzable organosilane, and performing (partial) hydrolysis to make a prepolymer. Can do.
A silicone resin is prepared by, for example, adding a necessary amount of water as a curing agent and, if necessary, a catalyst or the like to a hydrolyzable organosilane, and performing (partial) hydrolysis to make a prepolymer. Can do.
The amount of water used for hydrolyzing the hydrolyzable organosilane is not particularly limited. For example, water (H ₂ O) relative to the hydrolyzable group (OR) of the hydrolyzable organosilane. The molar equivalent ratio (H ₂ O / OR) is preferably 0.3 to 5, more preferably 0.35 to 4, and still more preferably 0.4 to 3.5. If the molar equivalent ratio is less than 0.3, hydrolysis does not proceed sufficiently and the cured coating may become brittle. If it exceeds 5, the resulting silicone range tends to gel in a short time. , Storage stability may be reduced.

Further, the catalyst used as necessary when (partially) hydrolyzing the hydrolyzable organosilane is not particularly limited, but an acidic catalyst is preferable from the viewpoint of shortening the time required for the production process. The acidic catalyst is not particularly limited. For example, acetic acid, chloroacetic acid, citric acid, benzoic acid, dimethylmalonic acid, formic acid, propionic acid, glutaric acid, glycolic acid, maleic acid, malonic acid, toluenesulfonic acid, Examples include organic acids such as acids; inorganic acids such as hydrochloric acid, nitric acid, and halogenated silane; acidic sol-like fillers such as acidic colloidal silica and oxidized titania sol. These can be used alone or in combination of two or more.
The (partial) hydrolysis of the hydrolyzable organosilane may be performed by heating (for example, heating to 40 to 100 ° C.) as necessary.

  The (partial) hydrolysis of the hydrolyzable organosilane may be carried out by diluting the hydrolyzable organosilane with an appropriate solvent, if necessary. Such a diluting solvent (reaction solvent) is not particularly limited. For example, lower aliphatic alcohols such as methanol, ethanol, isopropanol, n-butanol, isobutanol; ethylene glycol, ethylene glycol monobutyl ether, ethylene acetate Examples include ethylene glycol derivatives such as glycol monoethyl ether; diethylene glycol derivatives such as diethylene glycol and diethylene glycol monobutyl ether; and diacetone alcohol. One or more selected from the group consisting of these are used. be able to. In combination with these hydrophilic organic solvents, one or more of toluene, xylene, hexane, heptane, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, methyl ethyl ketoxime and the like can be used.

Although the weight average molecular weight (Mw) of the silicone resin used by this invention is not specifically limited, The range of 500-1000 is preferable in polystyrene conversion. If it is less than 500, the silicone resin is unstable, and if it is more than 1000, the coating film cannot maintain sufficient hardness.
The hydrophilic coating material composition of the present invention further contains an organic Zr compound as an essential component in addition to the silicone resin. The organic Zr compound promotes the condensation reaction by dehydration and dealcoholization, increases the cross-linking density of the coating film, improves the adhesion to the base material, hardens the film, and further has hydrophobic, water and water resistance. Has an alkali effect and the like.

As an organic Zr compound,
ZrO _n R ¹ _m (OR ² ) _p
(Here, R ¹ and R ² represent the same or different monovalent organic groups or hydrogen atoms, p is an integer of 1 to 4, n is 0 or 1, and 2n + m + p = 4.)
Is preferably used. Especially when Zr (OC ₄ H ₉ ) ₃ (C ₅ H ₇ O ₂ ) and Zr (OC ₄ H ₉ ) (C ₅ H ₇ O ₂ ) (C ₆ H ₉ O ₃ ) ₂ are used, Even when drying is performed at room temperature after coating, the antifogging property is higher than that in the initial stage in the same manner as when baking is performed at about 300 ° C.

The content of the organic Zr compound is preferably 0.1 to 30% by weight with respect to the total solid content of the hydrophilic coating material composition. If the amount is less than 0.1% by weight, the effect of addition may not be observed. If the amount exceeds 30% by weight, the coating material may be gelled or aggregated.
The hydrophilic coating material composition of the present invention may also contain a filler, if necessary. The filler is not particularly limited, and for example, known fillers such as silica, alumina, inorganic fillers such as inorganic oxides such as optical semiconductors, and organic fillers such as carbon black can be used. Among these, inorganic fillers are particularly preferable from the viewpoints of chemical stability such as solvent resistance and acid resistance, dispersibility in a silicone resin, and abrasion resistance of a cured film. Only 1 type of filler may be used and it may use 2 or more types together.

  The form of silica used as the inorganic filler is not particularly limited, and may be, for example, a powder form or a sol form (colloidal silica). Although it does not specifically limit as said colloidal silica, For example, non-aqueous organic-solvent dispersoid colloids, such as water dispersibility or alcohol, can be used. Generally, such colloidal silica contains 20 to 50% by weight of silica as a solid content, and the amount of silica can be determined from this value. When water-dispersible colloidal silica is used, water present as a component other than solid content in the colloidal silica can be used for (partial) hydrolysis of hydrolyzable organosilane ((partial) hydrolysis. In addition to the amount of water used during The water-dispersible colloidal silica is usually made from water glass, but can be easily obtained as a commercial product. The organic solvent-dispersible colloidal silica can be easily prepared by replacing the water of the water-dispersible colloidal silica with an organic solvent. Such an organic solvent-dispersible colloidal silica can be easily obtained as a commercial product in the same manner as the water-dispersible colloidal silica. In the organic solvent-dispersible colloidal silica, the type of the organic solvent in which the colloidal silica is dispersed is not particularly limited. For example, lower aliphatic alcohols such as methanol, ethanol, isopropanol, n-butanol, and isobutanol; ethylene Examples include ethylene glycol derivatives such as glycol, ethylene glycol monobutyl ether, and ethylene glycol monoethyl ether; diethylene glycol derivatives such as diethylene glycol and diethylene glycol monobutyl ether; and diacetone alcohol. One kind selected from the group consisting of these Alternatively, two or more types can be used. In combination with these hydrophilic organic solvents, one or more of toluene, xylene, hexane, heptane, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, methyl ethyl ketoxime and the like can be used.

The hydrophilic coating material composition of the present invention obtains various functions by the photocatalytic effect described later, and further increases the surface hydrophilicity of the formed coating film by the photocatalytic effect or maintains it for a long period of time. It is preferable that an optical semiconductor is included as the inorganic filler.
The optical semiconductor is not particularly limited. For example, titanium oxide, zinc oxide, tin oxide, iron oxide, zirconium oxide, tungsten oxide, chromium oxide, molybdenum oxide, ruthenium oxide, germanium oxide, lead oxide, cadmium oxide, and oxide. In addition to metal oxides such as copper, vanadium oxide, niobium oxide, tantalum oxide, manganese oxide, cobalt oxide, rhodium oxide, nickel oxide and rhenium oxide, strontium titanate and the like can be given. Among these, the metal oxide is preferable in terms of practical and easy use, and titanium oxide is particularly preferable among the metal oxides because of its photocatalytic performance, curing acceleration performance, safety, availability, and cost. In terms of surface. When titanium oxide is used as an optical semiconductor, the one with a crystal type of anatase type (anatase type) has the strongest photocatalytic performance and curing acceleration performance, and it develops for a long period of time. This is preferable in that the acceleration performance is manifested in a shorter time.

Only one type of optical semiconductor may be used, or two or more types may be used in combination.
In addition, what becomes the raw material of an optical semiconductor can be used if it finally shows the property of an optical semiconductor.
It is known that active oxygen is generated when light (ultraviolet light) having an excitation wavelength (for example, 400 nm) hits an optical semiconductor. Since active oxygen can oxidize and decompose organic substances, carbon-based soil components (for example, automobiles) attached to the surface of the substrate coated with a coating material composition containing an optical semiconductor are coated on the surface of the substrate. Self-cleaning effect for decomposing carbon fractions and cigarettes contained in exhaust gas; Deodorizing effect for degrading malodorous components typified by amine compounds and aldehyde compounds; typified by Escherichia coli and Staphylococcus aureus Antibacterial effect to prevent the generation of fungal components; In addition, when ultraviolet light is applied to the material coated with the coating material composition containing the optical semiconductor on the surface of the base material, the optical semiconductor uses its photocatalytic action to convert moisture in the air or moisture attached to the surface of the material to hydroxyl radicals. This hydroxyl radical decomposes and removes organic substances (such as those attached to the material surface and those contained in the material surface) that repel water, thereby reducing the contact angle of water with the material surface. There is also an effect of improving hydrophilicity (water wettability) that the surface of the material is easily wetted (familiar) with water. From this hydrophilicity-improving effect, the indoor member is expected to have an anti-fogging effect in which glass and mirrors are not easily fogged by water droplets, and the outdoor member is expected to have an anti-fouling effect in which attached dirt is washed away by rainwater. Furthermore, there is an antistatic function by the photocatalytic action of the optical semiconductor, and this function further improves the antifouling effect.

The filler may be in any form as long as it is dispersible in the coating material composition, such as powder, fine particle powder, solution-dispersed sol particles, etc. Curing proceeds in a shorter time, and is more convenient for use.
The dispersion medium to be used is not particularly limited as long as the filler can be uniformly dispersed, and any aqueous or non-aqueous solvent can be used.
The aqueous solvent is not particularly limited. For example, in addition to water alone, hydrophilic organic solvents (for example, lower aliphatic alcohols such as methanol, ethanol, isopropanol, n-butanol, isobutanol; ethylene glycol, ethylene glycol) A mixed solvent of at least one of ethylene glycol derivatives such as monobutyl ether and ethylene glycol monoethyl ether; diethylene glycol derivatives such as diethylene glycol and diethylene glycol monobutyl ether; diacetone alcohol and the like) and water can be used. Among these aqueous solvents, a water-methanol mixed solvent is preferable in view of dispersion stability of the filler and drying property of the dispersion medium after coating. Furthermore, by using an aqueous sol, it can also serve as an acidic catalyst function during (partial) hydrolysis of the hydrolyzable organosilane.

The non-aqueous solvent that can be used as the filler dispersion medium is not particularly limited. For example, at least one selected from the group consisting of the above hydrophilic organic solvents and hydrophobic organic solvents such as toluene and xylene. Various organic solvents can be used. Among these non-aqueous solvents, methanol is preferable in terms of the dispersion stability of the filler and the drying property of the dispersion medium after coating.
The method for uniformly dispersing the filler in the dispersion medium is not particularly limited, and for example, various ordinary dispersion methods using a homogenizer, a disper, a paint shaker, a bead mill and the like can be used.

The method for producing the hydrophilic coating material composition of the present invention is not particularly limited, and each component may be mixed using a normal method and apparatus.
The hydrophilic coated product of the present invention is provided with a coating layer made of a coated and cured film of the hydrophilic coating composition of the present invention on the surface of a substrate.
The method for applying the hydrophilic coating material composition of the present invention is not particularly limited. For example, brush coating, spray coating, dipping (also referred to as dipping or dip coating), roll coating, flow coating (of the substrate) Various usual coating methods such as a flow coating method in which a coating material is poured from the upper part of the coating site, curtain coating, knife coating, spin coating, bar coating, and the like can be selected.

About the hardening method of the coating film of the hydrophilic coating material composition of this invention, a well-known method should just be used and it does not specifically limit. Further, the temperature at the time of curing is not particularly limited, and can range from a room temperature to a heating temperature depending on the desired cured film performance, the heat resistance of the filler and the substrate, and the like.
As a substrate to which the hydrophilic coating material composition of the present invention is applied (which is also a substrate used in the hydrophilic coating product of the present invention), various substrates can be used regardless of organic or inorganic, Although it does not specifically limit, For example, glass, a metal, a plastic etc. are mentioned. These base materials are preferably pre-cleaned so that a coating film can be formed uniformly during coating, or in order to improve adhesion to the coating film. The method is not particularly limited, and examples thereof include alkali cleaning, ammonium fluoride cleaning, plasma cleaning, and UV cleaning.

Hereinafter, the present invention will be described in detail by examples and comparative examples. In Examples and Comparative Examples, unless otherwise specified, “parts” all represent “parts by weight” and “%” all represent “% by weight”. Further, the molecular weight is measured by GPC (gel permeation chromatography), using a standard polystyrene with a calibration curve using HLC8020 manufactured by Tosoh Corporation as a measurement model, and measuring the converted value. The present invention is not limited to the following examples.
<Example 1>
A coating solution was obtained by adding 356 parts of methanol to 208 parts of tetraethoxysilane, mixing 18 parts of water and 18 parts of 0.01N hydrochloric acid, and mixing well using a disper. The obtained liquid was heated in a constant temperature bath at 60 ° C. for 2 hours to adjust the weight average molecular weight to 950, thereby obtaining a silicone resin (A).

Next, a titanium oxide water sol (solid content: 21%, average primary particle size: 20 nm) is added to the silicone resin (A) as a filler component (photo semiconductor) based on the solid content of the photo semiconductor / total silicone resin (condensed compound equivalent). Was added so that the weight ratio was 1.0, and diluted with methanol so that the total solid content was 5% to obtain a basic coating material. A hydrophilic coating material composition was obtained by adding 1% of Zr (OC ₄ H ₉ ) ₃ (C ₅ H ₇ O ₂ ) as an organic Zr compound to the basic coating material solid content.
This was left to stand for 1 hour, and then coated on a glass substrate with a spin coater and baked at 300 ° C. to prepare a hydrophilic coated product.

<Example 2>
In Example 1, the same operation as in Example 1 was carried out except that Zr (OC ₄ H ₉ ) (C ₅ H ₇ O ₂ ) (C ₆ H ₉ O ₃ ) ₂ was added as the organic Zr compound to make it hydrophilic. A coating material composition was obtained. Next, using this hydrophilic coating material composition, a hydrophilic coated product was produced in the same manner as in Example 1.
<Example 3>
In Example 1, a hydrophilic coating material composition was obtained in the same manner as in Example 1 except that the amount of the organic Zr compound added was 20% based on the solid content of the basic coating material. Next, using this hydrophilic coating material composition, a hydrophilic coated product was produced in the same manner as in Example 1.

<Example 4>
In Example 2, a hydrophilic coating material composition was obtained in the same manner as in Example 2 except that the amount of the organic Zr compound added was 20% based on the solid content of the basic coating material. Subsequently, using this hydrophilic coating material composition, a hydrophilic coated product was produced in the same manner as in Example 2.
<Example 5>
In Example 3, a hydrophilic coating material composition was obtained by performing the same operation as in Example 3 except that the drying temperature was 30 ° C. Subsequently, using this hydrophilic coating material composition, a hydrophilic coated product was produced in the same manner as in Example 3.

<Example 6>
In Example 1, silica methanol sol (trade name: methanol silica sol, manufactured by Nissan Chemical Industries, particle size 10 to 20 nm) was used as a filler component with a weight ratio of 0. 0 based on the solid content of filler / total silicone resin (condensed compound equivalent). A hydrophilic coating material composition was obtained in the same manner as in Example 1 except that the amount was 25. Next, using this hydrophilic coating material composition, a hydrophilic coated product was produced in the same manner as in Example 1.
<Comparative Example 1>
In Example 1, a coated product was produced in the same manner as in Example 1 except that the basic coating material was coated on the glass substrate without adding the organic Zr compound to the basic coating material.

<Comparative example 2>
In Example 5, a coated article was produced in the same manner as in Example 5 except that the basic coating material was coated on the glass substrate without adding the organic Zr compound to the basic coating material.
<Comparative Example 3>
In Example 6, a coated product was prepared in the same manner as in Example 6 except that the basic coating material was coated on the glass substrate without adding the organic Zr compound to the basic coating material.
[Evaluation of coating film performance]
The coating film performance of the coated product obtained as described above was evaluated by the following method.

(Contact angle with water)
After forming the coating film, it was sufficiently cooled to room temperature under the condition where it was not exposed to ultraviolet rays, and the contact angle with water was measured.
The evaluation results are shown in Table 1.

  As seen in Table 1, in each of Examples 1 to 6, the contact angle was less than 10 °. On the other hand, in Comparative Examples 1 to 3 in which no organic Zr compound was used, the contact angle exceeded 30 °. From this, it can be seen that by using the organic Zr compound, excellent antifogging properties are exhibited immediately after the coating film is formed.

Claims (9)

  A hydrophilic coating material composition comprising a silicone resin and an organic Zr compound. The hydrophilic coating material composition according to claim 1, wherein the organic Zr compound is a compound represented by ZrO _n R ¹ _m (OR ² ) _p .
(Here, R ¹ and R ² represent the same or different monovalent organic groups or hydrogen atoms, p is an integer of 1 to 4, n is 0 or 1, and 2n + m + p = 4.) The hydrophilic property according to claim 1, wherein the organic Zr compound is a compound represented by ZrO _n R ¹ _m (OR ² ) _p is Zr (OC ₄ H ₉ ) ₃ (C ₅ H ₇ O ₂ ). Coating material composition. The hydrophilic coating material composition according to claim 1, wherein the organic Zr compound is Zr (OC ₄ H ₉ ) (C ₅ H ₇ O ₂ ) (C ₆ H ₉ O ₃ ) ₂ .   The hydrophilic coating material composition in any one of Claim 1 to 4 which contains the said organic Zr compound 0.1 to 30weight% with respect to the total solid of a hydrophilic coating material composition.   The hydrophilic coating material composition according to any one of claims 1 to 5, which also contains an inorganic filler.   The hydrophilic coating material composition according to claim 6, wherein the inorganic filler is an optical semiconductor. The hydrophilic coating material composition according to claim 7, wherein the optical semiconductor is anatase TiO ₂ . A hydrophilic coated product comprising a coating layer comprising a coating film of the hydrophilic coating material composition according to any one of claims 1 to 8 on the surface of a substrate.