JP2002179949A - Liquid for forming titania film, method of forming titania film, titania film and member made by using titania film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid for forming a titania film, which is excellent in shelf stability, has high safety because of neutrality, and makes it possible to reveal the ability to decompose organic substances, the stain resistance, the antifogging properties and the drip-proofness of titania by only drying it at a low temperature, although those characteristics can only be revealed so far by heating it at a high temperature. SOLUTION: The liquid for forming a titania film is obtained by reacting hydrogen peroxide with a titanium hydroxide gel prepared from an aqueous titanium compound solution and a basic substance to give a synthetic titania sol solution, and mixing the sol solution with a water-soluble or water-dispersible polyalkylene glycol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a titania film, a liquid for forming a titania film, a method for forming a titania film, a method for forming a titania film, and a titania film used in the fields of protective films, photocatalysts, ultraviolet cut films, and colored coatings of various materials. Related to the members used.

[0002]

2. Description of the Related Art A titania film is formed by applying a powder slurry of titanium oxide or an aqueous solution of titanium chloride or titanium sulfate to a base material, followed by a firing method, or a sol prepared by hydrolysis of a metal alkoxide. Sol-gel method of baking after coating, sputtering method of sputtering titanium oxide target in high vacuum to form a film on the substrate, organic metal and halide of titanium are volatilized and decomposed in electric furnace There are a CVD method in which a film is formed thereon, a plasma spraying method in which solid particles of titanium oxide are melted in plasma generated in the air and beaten on the surface of the substrate.

[0003] Although the method of applying the titanium oxide powder slurry is simple, it is difficult to obtain a dense and good-adhesion film, and the firing temperature is generally high, so that the type of the substrate is considerably limited.
The method of applying an aqueous solution such as titanium chloride or titanium sulfate generates a harmful halogen compound and requires a firing temperature of several hundred degrees or more, and is not used in the above-mentioned application fields.

[0004] The plasma spraying method is a film forming method in which solid particles are melted in plasma and struck against the surface of a base material. The film forming speed is high, but it is difficult to obtain a dense film, and a uniform and highly adherent titanium oxide film is formed. It could not be produced.

[0005] Further, in the sputtering method, the CVD method, and the like, a good film cannot be obtained unless the pressure is reduced, and a reaction vessel capable of evacuating is required. There is a disadvantage that the substrate must be heated to several hundred degrees or more.

[0006] Commercial titania sol produced by the sol-gel method can be applied and impregnated, can be coated over a large area, and has many industrial advantages. However, organic metals such as titanium tetraisopropoxide and tetrabutyl titanate are used. Raw materials are expensive because
In addition, there is a problem that the raw material is chemically unstable, is easily affected by temperature control and atmosphere, and is difficult to handle. In addition, the sol-gel method requires heating at 400 ° C. or higher to remove by baking because an acid or an organic substance is contained in the raw material sol, and is not suitable for a material easily susceptible to acid, and tends to be porous at low-temperature baking. Also, in the titania sol produced by the sol-gel method, acids, alkalis or organic substances are added,
There are disadvantages such as the problem of corrosion of the material to be coated and the necessity of a temperature (400 ° C. or higher) for incineration of organic substances, and the generation of harmful halides and nitrogen oxides during heating and firing.

In order to improve these drawbacks, for example, as proposed in Japanese Patent Application Laid-Open No. Hei 9-71418, an amorphous titania sol having no photocatalytic ability itself is applied to a substrate, followed by heat treatment. Although a method of forming a dense titania film having excellent properties has been proposed, a heat treatment is required, so that the usable base materials and applications are limited. .

For example, Japanese Patent Application Laid-Open No. Hei 9-71418 proposes a method of forming a dense titania film having good adhesion by heating at a relatively low temperature. At least 10 to form
Substrates and applications that can be used are limited because heating at about 0 ° C. is required.

In order to provide a photocatalytic function to a coating film dried at room temperature in order to solve the problem of heating for forming a coating film, a method of applying heat treatment to a titanium sol solution and then applying it to a substrate is disclosed in, for example, JP-A-9-71418. It is proposed in the gazette. However, since the photocatalyst applied by heat treatment in advance is active, if applied as it is, a problem of chalking occurs when the base material is an organic substance.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to form a titania film which is excellent in storage stability, is highly safe because of its neutrality, and can form a titania film having excellent properties at low temperatures. To provide a liquid for use. Another object of the present invention is the organic matter decomposability of titania that was expressed only by heating at a high temperature in the conventional titania film forming method,
It is an object of the present invention to provide a method for forming a titania film which can exhibit stain resistance, anti-fogging property and drip-proof property only by drying at a low temperature. Another object of the present invention is to provide a titania film excellent in the above characteristics and a member provided with the titania film and having the above excellent characteristics.

[Means for Solving the Problems]

The present inventors have conducted intensive studies in view of such a problem, and as a result, by adding and mixing a specific organic substance to a titania sol solution obtained by a specific method having no photocatalytic ability itself, and mixing the same. The present inventors have found that a titania film having a photocatalytic ability can be formed without performing heat treatment at a temperature of not less than ° C, and based on this finding, have completed the present invention.
That is, the present invention provides a titania film formed by mixing a water-soluble or water-dispersible polyalkylene glycol with a titania sol solution synthesized by acting hydrogen peroxide on a titanium hydroxide gel prepared from an aqueous solution of a titanium compound and a basic substance. For liquids. In addition, the present invention relates to a method for forming a titania film, comprising applying or impregnating the above-described liquid for forming a titania film to a substrate, and drying the substrate at a temperature of 100 ° C. or lower. Further, the present invention provides a titania film obtained by the above method and any one selected from an organic substance decomposition function provided with the titania film, a stain prevention function, an ultraviolet absorption function, an anti-fog function and a drip-proof function. It relates to a member having two or more functions.

According to the present invention, a coating film having a photocatalytic function can be obtained without adding a heat treatment at 100 ° C. or higher by simply adding and mixing an organic substance to an amorphous titania sol solution having no photocatalytic ability itself, A one-part titania film-forming liquid that does not require a pretreatment such as a primer for protecting the base material and imparting adhesion is obtained.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In order to solve the above-mentioned problems, in the present invention, a liquid for forming a titania film is obtained by the following means. First, a titanium hydroxide gel called orthotitanic acid was prepared from an aqueous solution of a titanium compound such as titanium tetrachloride or a titanium compound such as titanium sulfate and a basic substance such as ammonia or caustic soda. Next, the precipitate of the titanium hydroxide gel is washed with water by decantation using water, and the titanium hydroxide gel is separated. Further, a transparent viscous liquid is obtained by further reacting hydrogen peroxide to decompose and remove excess hydrogen peroxide. This liquid is considered to be a titania sol solution containing titanium hydroxide in a peroxide state, as described later, and is essentially different from a commercially available titania sol solution. After applying or impregnating a liquid for forming a titania film formed by mixing an organic substance on the substrate,
0 ° C. or lower, preferably 10 to 50 ° C., preferably 30 ° C.
By drying for minutes to 24 hours, a dense titania film having excellent adhesion can be formed. In addition, it is possible to form a titania film having a thickness of 1 μm or more with a single coating with good adhesion without peeling.

The titanium compound is preferably inexpensive and easy to handle, such as sulfates, chlorides, oxalates, and the like. The basic substance causing precipitation of hydroxide is preferably aqueous ammonia, caustic soda, or the like. It is desirable to combine them so that the salt by-produced by the reaction becomes stable and harmless sodium chloride, sodium sulfate or ammonium chloride. The concentration of the titanium compound is not particularly limited, but the reaction is usually performed in a 5 to 80% by weight aqueous solution. The precipitation is preferably performed at a pH of 1 to 3, more preferably about 2, so that impurities such as Fe do not co-precipitate. Also,
The formation of the precipitate is preferably performed at 5 to 40 ° C. for 1 to 24 hours.

The precipitated titanium hydroxide gel (sometimes referred to as orthotitanic acid) is in a gel state polymerized by polymerization of OH and hydrogen bonds, and cannot be used as a coating solution for the titania film as it is. When hydrogen peroxide is applied to this gel, a part of OH becomes a peroxide state and dissolves as peroxotitanate ions, or it becomes a kind of sol in which the polymer chain is divided into low molecules, and the excess hydrogen peroxide Is decomposed into water and oxygen and can be used as a titania sol solution for forming a titania film. Since this titania sol solution contains only oxygen and hydrogen in addition to titanium, only water and oxygen are generated when it is changed to titanium oxide by drying or baking, the carbon component required for the sol-gel method or thermal decomposition method such as sulfates Therefore, a crystalline titania film having a relatively high density can be manufactured even at a lower temperature than in the related art, without removing a halogen component. Also, since the pH is neutral, there is no need to consider the effects on the human body during use and corrosion of the substrate. In addition, hydrogen peroxide acts not only as a sol agent but also as a stabilizer, and has extremely high stability in the room temperature range of the sol and withstands long-term storage. Hydrogen peroxide is preferably 1 to 40% by weight from the viewpoint of safety.
Hydrogen peroxide solution is used, and the amount of addition thereof is preferably titanium hydroxide / hydrogen peroxide = 1 / 0.7 to 1 / 1.5, and more preferably 1 in weight ratio to the solid content of titanium hydroxide gel.
The mixture is allowed to act at 0 to 50 ° C., preferably for 30 minutes to 6 hours. Thereafter, distilled water is added so that the concentration of titanium oxide becomes 0.5 to 3% by weight to obtain a titania sol solution.

As the organic substance to be added to the titania sol solution that can be used in the present invention, a water-soluble or water-dispersible polyalkylene glycol is used in view of the stability of the titania sol solution. Specific examples of the polyalkylene glycol include polyethylene glycol, polypropylene glycol, a polyethylene glycol-polypropylene glycol copolymer, and polytetrahydrofuran. The weight average molecular weight of the polyalkylene glycol is preferably 4,000
0 or less, more preferably 62 to 1,000. The polyethylene glycol-polypropylene glycol copolymer may be any of a random copolymer and a block copolymer. When the weight average molecular weight of the polyalkylene glycol exceeds 4,000, it takes time to dissolve in water, and the workability tends to decrease. The amount of the polyalkylene glycol to be added may be a solid content of 1 in the titania sol solution.
It is preferable to use 0.1 to 5.0 parts by weight based on parts by weight. If the amount of polyalkylene glycol is less than 0.1 part by weight, the photocatalytic ability of the room temperature dried coating film tends to be inferior, and if it exceeds 5.0 parts by weight, the film strength and durability of the room temperature dried coating film tend to be inferior. .

When the titania film forming liquid is applied or impregnated on a substrate, in order to improve the wettability with the substrate,
A compound having an alkyl silicate structure can be added. As a compound having an alkyl silicate structure that can be used in the present invention, polyalkylene glycol-modified polydimethylsiloxane is mentioned as a preferable example. The molecular weight of the polyalkylene glycol-modified polydimethylsiloxane is 1 in terms of weight average molecular weight.
00 to 10,000 is preferable, and 1,000 to 7000
0 is more preferred. A polyalkylene glycol-modified polydimethylsiloxane having a molecular weight of less than 100 tends to have poor wettability with a substrate, and a molecular weight exceeding 10,000 tends to adversely affect the stability of a titanium sol solution. As such a polyalkylene glycol-modified polydimethylsiloxane, for example, those sold under the trade names FZ-2161 and FZ-3751 by Nihon Unica Ltd. can be used. The addition amount of the compound having an alkyl silicate structure is preferably 0.1 to 5.0 parts by weight based on 1 part by weight of the solid content of the titania sol solution.

The titania film obtained by the present invention can be irradiated with ultraviolet rays for the purpose of improving the strength of the coating film.
The irradiation dose of ultraviolet rays, 2J / cm ² or more, preferably to obtain a sufficient coating strength at 2.2~5.4J / cm ^2. As a method for irradiating ultraviolet rays, sunlight, a fluorescent lamp, a black light, a high-pressure mercury lamp, or the like can be used. However, a black light is preferable because a large amount of ultraviolet light can be irradiated in a short time and the apparatus is simple.

The titania film forming liquid of the present invention may contain, if necessary, known surfactants, defoaming agents, coupling agents, dyes, pigments, fillers and the like to such an extent that the properties of the titania film are not impaired. It can also be added.

The substrate used in the film forming method of the present invention is not particularly limited. For example, a thermoplastic resin such as polycarbonate, acrylic resin, polyester resin, ABS resin, polyvinyl chloride, a thermosetting resin, and an ultraviolet curable resin. Mold resin,
Examples include organic materials such as electron beam-curable resins and electron beam-curable resins, glass, ceramics, various metals, and composite materials thereof.

The member provided with the titania film having a photocatalytic function according to the present invention includes water,
Air purifying, anti-fouling, anti-fog, dew-proof, drip-proof, anti-icing, snow-proof, anti-bacterial, anti-mold, anti-algal, anti-odor, anti-dirt function, ultraviolet absorption function, organic matter decomposition function All components that can be included.

As specific examples, various road members such as a road wall panel, a reflector, a traffic sign, a guidance display, and the like,
Interior and exterior materials for buildings, interior and exterior components of vehicles, ships, aircraft, etc., home appliances such as air conditioners, cleaning machines, refrigerators, washing machines, etc. Examples include various kinds of glass such as powder, mirrors, lighting equipment, and tiles.

[0023]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to the examples. In Examples, unless otherwise specified, “%” indicates “% by weight” and “parts” indicates “parts by weight”. Titania sol solution synthesis example as a raw material was dropped four 500 cm ³ and the solution of 2.5 wt% aqueous ammonia chloride titanium 60% solution 5 cm ³ with distilled water, to precipitate titanium hydroxide. After washing with distilled water,
10 cm ^{3 of a} 30% solution of hydrogen peroxide was added and stirred to prepare 70 cm ³ of a yellow viscous liquid (sol solution) containing titanium. Thereafter, distilled water was added so that the concentration of titanium oxide became 1.7% to prepare a titania sol solution. Immediately after the addition of hydrogen peroxide, oxygen is generated and foaming occurs. However, after excess hydrogen peroxide is decomposed, the foaming subsides.
There was no separation or gelation even after months. The pH was neutral at 6.4.

Preparation of Titania Film Forming Liquid Preparation Example 1 Titania sol solution 3 synthesized in the titania sol solution synthesis example
0.15 g of PEG # 300 (trade name, manufactured by NOF CORPORATION, polyethylene glycol, molecular weight 300) is added to 0 g,
The mixture was stirred at 25 ° C. until it became uniform to prepare a titania film forming liquid 1. This solution did not separate or gel even after 6 months under normal temperature and normal pressure. The pH was 6.8 and neutral. Preparation Example 2 Titania sol solution 3 synthesized in the titania sol solution synthesis example
0 g of Pronon 104 (trade name, manufactured by NOF CORPORATION,
0.6 g of polyethylene glycol-polypropylene glycol block copolymer (ethylene unit / propylene unit = 40/60 weight ratio) was added thereto, and the mixture was stirred at 25 ° C. until the mixture became uniform to obtain a titania film forming liquid 2. This solution did not separate or gel even after 6 months under normal temperature and normal pressure. The pH was neutral at 6.7. Preparation Example 3 Titania sol solution 3 synthesized in titania sol solution synthesis example
0 g PEG # 300 (trade name, manufactured by NOF Corporation, molecular weight 3
00) 0.15 g and polyether-modified polydimethylsiloxane FZ-2161 (trade name, manufactured by Nippon Unicar, molecular weight: 5,000, siloxane content: 40% by weight)
5 g was added, and the mixture was stirred at 25 ° C. until the mixture became uniform to obtain a titania film forming liquid 3. This solution did not separate or gel even after 6 months under normal temperature and normal pressure. The pH was 7.1 and neutral. Preparation Example 4 Titania sol solution 3 synthesized in titania sol solution synthesis example
0 g of Pronon 104 (trade name, manufactured by NOF CORPORATION,
Polyethylene glycol-polypropylene glycol block copolymer, ethylene unit / propylene unit = 40/60 weight ratio) and FZ-3751 (trade name, manufactured by Nippon Unicar, polyether-modified polydimethylsiloxane, molecular weight 5,000, siloxane content 40% by weight) ) 0.15 g was added, and the mixture was stirred until the mixture became uniform to obtain a liquid 4 for forming a titania film. This solution is 6
There was no separation or gelation even after months. The pH was 6.9 and neutral.

Comparative Preparation Example 1 The titania sol solution synthesized in the titania sol solution synthesis example was heated at 200 ° C. for 6 hours to crystallize a part of the titania sol (anatase type) to obtain a liquid 5 for forming a titania film. This solution did not separate or gel even after 6 months under normal temperature and normal pressure. The pH was neutral at 7.0. Comparative Preparation Example 2 PEG @ 30 was added to 30 g of the titania sol solution of Comparative Preparation Example 1.
0.15 g of 0 (trade name, manufactured by NOF CORPORATION, polyethylene glycol, molecular weight: 300) was added, and the mixture was stirred at 25 ° C. until uniform to obtain a titania film forming liquid 6. This solution did not separate or gel even after 6 months under normal temperature and normal pressure.
The pH was neutral at 6.7. Comparative Preparation Example 3 PEGｇ30 was added to 30 g of the titania sol solution of Comparative Preparation Example 1.
0 (trade name, manufactured by NOF Corporation, molecular weight: 300) 0.15 g and polyether-modified polydimethylsiloxane FZ-21
0.15 g of 61 (trade name, manufactured by Nippon Unicar, molecular weight: 5,000, siloxane content: 40% by weight) was added, and 25
The mixture was stirred until the mixture became uniform at a temperature of 7 ° C. to obtain a titania film forming liquid 7. This solution did not separate or gel even after 6 months under normal temperature and normal pressure. The pH was 7.2 at neutral.

Evaluation of titania film Preparation of test plate Test plate preparation method: Hitaloid 3004 (trade name, manufactured by Hitachi Chemical Co., Ltd., acrylic polyol, heating residue 50)
%, Hydroxyl value 30 (varnish)) 100 g, CR-95
(Trade name, Ishihara Sangyo, titanium white) 40g, xylene 1
0 g and 100 g of glass beads were put in a mayonnaise bottle and dispersed with a paint shaker for 90 minutes. After the dispersion, the glass beads were separated from the dispersion by filtration with raw silk. After separating the glass beads, Duranate TP
A-100 (trade name, manufactured by Asahi Kasei Kogyo Co., Ltd., HDI adduct non-yellowing isocyanate, NCO% = 23.1)
Was added to 100 g of the dispersion, and the mixture was sufficiently stirred to obtain a paint. The obtained paint was applied using a bar coater # 40 to a treated steel sheet PBN144M (manufactured by Paltec) cut into 10 cm × 10 cm. After the application, it was dried at 20 ° C. for 72 hours to obtain a test plate.

Preparation of titania film-forming test plate The titania film-forming liquid obtained in Preparation Examples 1 to 4 was applied to an air gun (RG-2 manufactured by Anest Iwata Co., Ltd.) on a coated plate so as to have a dry film thickness of about 1 μm. , 0.4 mm in diameter). After the coating, the titania film forming test plates obtained by drying at 20 ° C. for 1 hour were referred to as Examples 1 to 4. The liquid for forming a titania film obtained in Comparative Preparation Examples 1 to 3 was spray-coated on a coated plate so that the dry film thickness was about 1 μm. After the coating, the titania film-forming test plates obtained by drying at 20 ° C. for 1 hour were used as Comparative Examples 1 to 3. The titania sol solution obtained in the titania sol solution synthesis example was spray-coated on the coated plate using an air gun (RG-2, manufactured by Anest Iwata, 0.4 mm in diameter) so that the dry film thickness was about 1 μm. A titania film-forming test plate obtained by drying at 20 ° C. for 1 hour after coating was used as Comparative Example 4.

The titania film forming liquids obtained in Preparation Examples 1 to 4 were applied to an aluminum plate using an air gun (RG-2, manufactured by Anest Iwata, 0.4 mm in diameter) so that the dry film thickness was about 1 μm. Spray painted. 20 ℃ after painting
The titania film forming test plates obtained by drying for 1 hour in Examples 1 to 4 were used as Examples 5 to 8. The liquid for forming a titania film obtained in Comparative Preparation Examples 1 to 3 was coated on an aluminum plate to a dry film thickness of about 1 μm.
m was spray-coated. After painting, 1 at 20 ° C
Comparative Example 5
To 7. The titania sol solution obtained in the titania sol solution synthesis example was dried on an aluminum plate to a dry film thickness of about 1 μm.
Airgun (RG-2, manufactured by Anest Iwata)
Spray coating was performed using a 0.4 mm diameter. After painting, 2
A titania film-forming test plate obtained by drying at 0 ° C. for 1 hour was used as Comparative Example 8.

Evaluation of titania film Organic matter resolution test 1.5 g of red ink (manufactured by Pilot Corporation) diluted 20 times with distilled water was placed on the titania films obtained in Examples 1 to 4 and Comparative Examples 1 to 4. And dried at 25 ° C. for 1 hour. Thereafter, a 20W black light (manufactured by Matsushita Electric Works, model number FL20) from a distance of 5 cm
S.SL-B) was irradiated for a predetermined time, and the degree of disappearance of the color of the red ink was visually confirmed. Table 1 shows the results.

[0030]

[Table 1]

Stain Prevention Test An outdoor exposure test was performed on the titania film forming test plates of Examples 1 to 4 and Comparative Examples 1 to 4 from September 1999 to June 2000. Table 2 shows the results.

[0032]

[Table 2]

The antifouling effect of the coating film was confirmed for all the titania films. However, in Comparative Examples 1 to 3 containing anatase type titanium oxide, the coating film caused chalking. In Comparative Example 3 in which the amount of the polyalkylene glycol added was large, the titania coating film disappeared in the three-month exposure test.

Drip-proof test Using the test plates of Examples 5 to 8 and Comparative Examples 5 to 8, 0.1 cm ³ of distilled water was dropped on the surface of the coating film at 20 ° C. using a microsyringe. Total CA-X
The contact angle was measured using a mold. After measuring the surface contact angle, the surface state of the coating film after wiping water droplets with gauze was visually observed. Table 3 shows the results.

[0035]

[Table 3]

The surface contact angle of the polyethylene glycol-added titania film was found to be 20 ° C. or less at which the anti-fogging and drip-proof functions were exhibited. The coating films containing anatase type titanium oxide of Comparative Examples 5 to 8 were easily peeled off from the substrate.

[0037]

The liquid for forming a titania film obtained according to the present invention is excellent in storage stability and neutral, and therefore has high safety. The titania film obtained by the titania film-forming liquid can exhibit organic matter decomposability, stain resistance, anti-fogging, and drip-proof properties by low-temperature drying, which were expressed only by heating at a high temperature in a conventional titania film. it can. Further, even if it is applied directly on an organic substance, no problem such as chalking is caused. For this reason, it can be used for buildings, automobiles, home appliances, organic coatings, and thermoplastics that could not be heated, and constructions, and is extremely useful as a one-part titania coating that does not use a primer. is there.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C01G 23/08 C01G 23/08 4J038 C08K 3/22 C08K 3/22 C08L 71/02 C08L 71/02 C09D 5 / 00 C09D 5/00 Z 5/16 5/16 171/02 171/02 183/04 183/04 C09K 3/00 112 C09K 3/00 112Z 112F 3/18 3/18 F term (reference) 4D075 BB24Z BB42Z BB46Z BB93Z CA10 CA34 CA37 CA39 CA45 CB07 DA06 DB01 DB13 DB14 DB35 DB37 DB38 DB43 DB48 DB63 DC01 DC05 DC08 DC11 DC15 DC18 DC24 DC38 EA12 EB37 EB43 EB56 EC01 EC08 EC54 4G047 CA02 CC01 CC03 CD02 4G0BAAABAAABAABAABAABAABAABAABAABAA CA01 CA11 DA06 EA08 FB13 FB23 FC03 FC04 4H020 AA01 AA03 AB02 4J002 CH021 CH031 DE136 GH01 HA07 4J038 AA011 AA012 DF021 DF022 DL131 DL132 HA211 HA212 JA0 2 JA03 JC32 KA04 NA05 NA06 NA19 NA26 NA27 PA17 PA18

Claims (7)

[Claims] 1. A titania film formed by mixing a titania sol solution synthesized by reacting hydrogen peroxide with a titanium hydroxide gel prepared from an aqueous solution of a titanium compound and a basic substance and a water-soluble or water-dispersible polyalkylene glycol. liquid. 2. The liquid for forming a titania film according to claim 1, further comprising a compound having an alkyl silicate structure. 3. The liquid for forming a titania film according to claim 1, wherein the ratio of the solid content of the titania sol solution to the organic substance is 1: 0.1 to 1: 5 by weight ratio of the former to the latter. 4. A method for forming a titania film, wherein the liquid for forming a titania film according to claim 1 is applied or impregnated to a substrate and dried at a temperature of 100 ° C. or less. . 5. A method for forming a titania film, wherein the titania film obtained by the method for forming a titania film according to claim 4 is irradiated with ultraviolet rays. 6. A titania film obtained by the method of claim 4 or 5. 7. A titania film according to claim 6, wherein the titania film has one or more functions selected from an organic substance decomposition function, a stain prevention function, an ultraviolet absorption function, an anti-fog function and a drip-proof function. Element.