KR101587308B1 - Coating composition, method of antifouling treatment and antifouling substrate - Google Patents

Abstract

Provided are a coating composition, an antifouling treatment method and an antifouling base which can form an antifouling coating film excellent in antifouling property, transparent and practically sufficient durability at low cost.
A compound represented by the formula (1) containing a perfluoroalkylene ether group in a molecular main chain and a hydrolyzable group containing a silicon atom in a side chain, and the solvent is at least one of a fluorinated hydrocarbon and a fluorinated ether The fluorine-based solvent has a boiling point of from 40 캜 to 70 캜 under 1 atm, and the difference between the maximum and minimum values of the boiling points of the fluorine-based solvents mixed is within 25 캜.

Description

TECHNICAL FIELD [0001] The present invention relates to a coating composition, an antifouling treatment method and an antifouling composition,

The present invention relates to a coating composition, an antifouling treatment method and an antifouling base material, and more particularly to a coating composition capable of imparting antifouling properties, an antifouling treatment method, and a cellular phone treated with antifouling by the above method.

The display surface of the mobile phone, the display surface of the liquid crystal panel or the touch panel, and the spectacle lens are attached by sebum, fingerprints, sweat, cosmetics, etc. by human use. Therefore, there is a case where the antifouling treatment is carried out as the surface treatment for preventing the contaminants from attaching well and for easily wiping the contaminants.

In the antifouling treatment, a substance having antifouling property is coated on the surface of the substrate with a thin film. As a raw material of the thin film, a fluoroalkyl resin or a silicone resin is often used. Among them, a compound containing a perfluoropolyether group has a small surface energy and contains an ether bond, It is known to exhibit excellent antifouling properties. When this is coated on a thin film, in order to ensure adhesion between the substrate and the thin film, a raw material is generally obtained by introducing a group capable of hydrolysis into the compound.

For example, Japanese Patent No. 3449070 proposes a method of coating a thin film with a perfluoropolyether-modified silane by a vacuum evaporation method. However, in the vacuum vapor deposition method, an expensive production equipment is required, and the productivity is low, so that there is a problem that the production cost rises. In addition, there is a problem that raw materials capable of being thinned by the vacuum vapor deposition method are limited to those having a molecular weight of about 5000 or less, so that there is a problem that a high-performance long-chain raw material can not be used.

Therefore, a wet coating method such as a dipping method and a spraying method, which can be produced at a low cost, has attracted attention.

However, in the conventional wet coating method, since a desired compound is dissolved in a soluble solvent to be applied to a surface of a base material, but the base compound contains a hydrolyzable group, when the solution is exposed to the atmosphere, And the compound react with each other to cause gelation of the solution or particle formation of the target compound.

Further, in the dip method, since the solution is exposed to the atmosphere for a long time, the deterioration of the solution is remarkable, and there arises a problem that the utilization efficiency of the raw material and the quality of the coating occur, resulting in an increase in the production cost. Further, in the dip method, it is difficult to form a film having practically sufficient durability because the film formed in principle does not deposit outside only one layer of the molecules.

Spraying can shorten the time that the solution is exposed to the atmosphere, so that deterioration of the solution can be avoided. Also, since the productivity is high and the large area is easy, it is a suitable method for mass production.

However, there is a problem that the droplets ejected from the spray nozzle adhere to the surface of the substrate, the wetting is diffused, the solvent is dried, and the objective compound is thinned on the surface, thereby causing the raw polymer to become cloudy and the coating film becoming cloudy.

Japanese Patent No. 3449070

An object of the present invention is to provide a coating composition, an antifouling treatment method and an antifouling base material which are capable of forming an antifouling coating film excellent in antifouling property, transparent and practically sufficient durability at low cost .

The coating composition of the present invention is characterized by being a composition containing a perfluoroalkylene ether group in a molecular main chain and a compound containing a hydrolyzable group containing a silicon atom in a side chain in a solvent. In this composition, the solvent is a mixed solvent of fluorinated solvents containing at least one of a fluorinated hydrocarbon and a fluorinated ether, and the fluorinated solvent has a boiling point of from 40 캜 to 70 캜 at 1 atm. And the difference between the maximum value and the minimum value of the boiling point is within 25 占 폚. In particular, the compound is a compound represented by the following formula (1).

(3)

Wherein Rf is a linear or branched perfluoroalkyl group having 1 to 16 carbon atoms, Y is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, R ¹ is a halogen atom, -OR ³ group, -OCOR ³ group, -OC ( R ³ ) = C (R ⁴ ) ₂ group, -ON = C (R ³ ) ₂ group and -ON = C (R ⁵ ) ₂ group, R ³ represents an aliphatic hydrocarbon group or represents an aromatic hydrocarbon group, R ⁴ represents a hydrogen atom or an alkyl group having a carbon number of 1~3, R ⁵ represents a divalent aliphatic hydrocarbon group having a carbon number of 3~6, q is an integer of 1~50, m is an integer from 0 to 2 , and r represents an integer of 1 to 10.

The fluorine-based solvent for dissolving the compound represented by the formula (1) is 1,1,1,3,3-pentafluorobutane, perfluorohexane, 1,1,1,2,2,3,3,4 , 5,5,5-undecafluoro-4- (trifluoromethyl) pentane, or methylnonafluorobutyl ether.

The anti-fouling treatment method of the present invention is an anti-fouling treatment method for performing an anti-fouling treatment by coating a surface of an inorganic substrate or a surface of an inorganic surface film formed on an inorganic or organic substrate, And the coating on the surface of the film is a coating in which the coating composition of the present invention is applied by a spraying method.

Particularly, the inorganic surface film is an inorganic surface film formed by applying a polysilazane solution by a spray method.

The antifouling base material of the present invention is an antifouling base material having an antifouling layer on the surface of the base material or on the surface of the inorganic surface film formed on the base material, and the antifouling layer is an antifouling layer formed by the antifouling treatment method of the present invention. Particularly, the antifouling base material is a cellular phone having an image display section and having the antifouling layer formed on the surface of the image display section.

The coating composition of the present invention uses a compound represented by formula (1) as a solvent with a specific structure and a plurality of mixed solvents having a specific boiling point as a solvent, so that a coating film having excellent antifouling property, transparency and practically sufficient durability, As shown in Fig.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view showing an example of an embodiment of a cellular phone according to the present invention.
FIG. 2 is a schematic view showing a cross section AA 'of FIG. 1; FIG.

The compound containing a perfluoroalkylene ether group usable in the present invention in the molecular main chain and the hydrolyzable group containing a silicon atom in the side chain is a compound which becomes a solute of a coating composition.

The perfluoroalkylene ether group is represented by the following formula (1-1), and the hydrolyzable group containing the silicon atom is represented by the following formula (1-2).

[Chemical Formula 4]

In the formula (1-1), n represents an integer of 1 to 5, m represents an integer of 0 to 2, and R ¹ represents a hydrolyzable group.

The frequency of the ether linkage in the perfluoroalkylene ether group is not particularly limited, and the repeating unit may be - (OCF ₂ ) -, - (OC ₂ F ₄ ) -, - (OC ₃ F ₆ ) - (OC ₄ F ₈ ) -, and the like, or a perfluoroalkylene ether group formed by combining two or more thereof. It is also preferred that one end of the perfluoroalkylene ether group is a C _n F _2n - group in which n is 1 or more.

The hydrolyzable group containing a silicon atom in the side chain may be a group decomposed by the action of water at the time of forming a coating film in the coating, and is represented by the above formula (1-2).

As R ^1, for example, a halogen atom, -OR ³ group, -OCOR ^{3 group, -OC (R 3) = C} (R 4) 2 ^{group, -ON = C (R 3)} 2 group, -ON = C (R ⁵ ) ₂ group, and the like. Here, R ³ represents an aliphatic hydrocarbon group or an aromatic hydrocarbon group, R ⁴ represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and R ⁵ represents a divalent aliphatic hydrocarbon group having 3 to 6 carbon atoms.

In the present invention, preferred as R ^1, formula (1) with compounds represented by a solute in a capable of suppressing the occurrence of white turbidity than the film chlorine atom, -OCH ₃ group, -OC ₂ H ₅ group.

Preferable examples of the compounds usable in the present invention include compounds represented by the formula (1).

Examples of the linear or branched perfluoroalkyl group having 1 to 16 carbon atoms represented by Rf include a trifluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, a perfluorobutyl group, and a perfluoropentyl group. have.

Examples of the alkyl group having 1 to 3 carbon atoms represented by Y include a methyl group, an ethyl group and a propyl group.

q is an integer of 1 to 50, preferably 18 to 30, more preferably 22 to 26, m is an integer of 0 to 2, preferably 0, and r is an integer of 1 to 10, .

The fluorine compound represented by the formula (1) can be obtained by subjecting a commercial perfluoropolyether to a silane treatment. Such a method is disclosed, for example, in Japanese Laid-Open Patent Publication No. 1-294709.

The fluorine-containing solvent containing at least one of the fluorinated hydrocarbon and the fluorinated ether constituting the component of the mixed solvent usable in the present invention has a boiling point of 40 ° C or more and 70 ° C or less under 1 atm. The difference between the maximum value and the minimum value of the boiling point of the fluorinated solvent in the mixed solvent is within 25 占 폚, preferably within 20 占 폚. The preferred composition of the mixed solvent is a mixed solvent of a fluorinated solvent 1 having a boiling point of 40 ° C or more and 70 ° C or less under 1 atm and a fluorinated solvent 2 having a boiling point within 20 ° C of the boiling point of the solvent 1.

It can be seen that when the coating agent comprising two or more kinds of solvents satisfying the above-mentioned boiling point conditions is spray-coated, unevenness of the film thickness can be suppressed and a transparent film can be obtained.

When a coating agent using one kind of solvent instead of a mixed solvent is coated by a spray method, the coating film tends to be cloudy and the range of conditions for obtaining a transparent thin film (for example, the humidity and temperature of the atmosphere at the time of coating, etc.) Resulting in a high cost process. Further, in the combination of solvents having a difference in boiling point exceeding 25 占 폚, uniformity of the film thickness of the film is impaired and unevenness that can be recognized visually occurs. If a solvent having a boiling point higher than 70 ° C. is used, it takes time to dry. Conversely, if a solvent having a boiling point of lower than 40 ° C. is used, the droplet of the coating composition sprayed from the sprayer is powdered before reaching the substrate, Can not be obtained. Though the mechanism thereof is not clear, by using the above solvent composition, it is possible to suppress the unevenness of the film thickness and to obtain a transparent film.

As the solvent that can be used in the present invention, it is preferable to use 1,1,1,3,3-pentafluorobutane (boiling point: 40 占 폚), perfluoro Hexane (boiling point 56 ° C), 1,1,1,2,2,3,3,4,5,5,5-undecafluoro-4- (trifluoromethyl) pentane (boiling point 56 ° C), methyl It is preferable that two or more kinds of solvents are selected and mixed in nonafluorobutyl ether (boiling point: 61 ° C). Particularly, it is preferable that two or more kinds of solvents having a difference in boiling point within 20 占 폚 are selected and mixed.

It is preferable that the mixing ratio of the mixed solvent is 1% by weight or more, preferably 2% by weight or more, of at least one component relative to the entire mixed solvent. On the other hand, the solvent may be mixed with an auxiliary agent for adjusting various properties such as wettability.

The coating composition of the present invention can be produced by a dip process in which a substrate is immersed in a coating composition, a spray process in which a coating composition is applied to a substrate in spray form, a wet process such as spin coating in which a coating composition is dropped while rotating the substrate, A dry process such as a vacuum evaporation process using a solute of a coating composition, or the like, may be coated by a known method to form an antifouling layer on the surface.

Of these, it can be seen that the antifouling layer formed by spraying is superior in abrasion resistance to other methods. Also, from the viewpoint of utilization efficiency of materials and productivity, the spray method is more advantageous than the other methods. Therefore, the spray method is most preferable as the coating method.

The substrate on which the antifouling layer is formed may be an inorganic substrate or an organic substrate.

Examples of the inorganic substrate include glass, metal, and ceramics. Of these, transparent or semitransparent glass, ceramics and the like are preferable.

Examples of the organic substrate include plastic, rubber, and elastomer. Of these, transparent or semitransparent plastic is preferable, and acrylic resin, polycarbonate resin and the like are particularly preferable.

This is because a transparent or semitransparent substrate is often used for a display portion such as a cellular phone or various display devices, and is a substrate particularly required for forming an antifouling layer.

The shape of the substrate is preferably a film or a sheet, but is not particularly limited. If the coated surface is flat or has a smooth curved surface, it can be used as a substrate for forming an antifouling layer. In addition, other surface treatments such as hard coating, anti-reflection coating, anti-glare coating, etc. may be performed on the substrate in advance.

It is preferable to form the inorganic surface film on the surface of the inorganic substrate or the organic substrate. Particularly, it is preferable to form an inorganic surface film on the surface of the organic substrate. By forming the inorganic surface film, adhesion of the antifouling layer is improved.

As the inorganic surface film, a metal film, a semiconductor film, an oxide film, a nitride film, an oxynitride film, or the like can be selected according to the product specification. The thickness of the inorganic surface film should be a minimum thickness necessary for securing the adhesion of the antifouling coating layer, preferably in the range of 0.01 to 1 mu m, and more preferably in the range of 0.05 to 0.2 mu m. However, when an inorganic film other than the antifouling property is required in the range from the requirement of the product, it is of course possible to use a film having an appropriate thickness.

The formation of the inorganic surface film on the surface of the substrate can be performed by a known formation method such as spraying, sol-gel method, sputtering, CVD or the like.

In the case of forming the antifouling layer of the compound represented by the formula (1), it can be seen that the inorganic surface film applied by the spraying method using the polysilazane solution has practically sufficient abrasion resistance. In addition, from the viewpoint of production cost and productivity, the inorganic surface film forming method of applying the polysilazane solution by the spray method is equivalent to or superior to other methods, and therefore, it is preferable to form the inorganic surface film by this method.

The polysilazane solution is commercially available from AZ Electronic Materials Co., Ltd. The concentration and the kind of solvent may be appropriately diluted and concentrated in accordance with the kind of substrate, film thickness, spraying conditions, and the like. On the other hand, as a carrier gas to be used for spraying the polysilazane solution, a gas which does not contain moisture is suitable, and nitrogen gas is most suitable from the viewpoint of cost. If necessary, the polysilazane-based inorganic film after drying may be allowed to stand in a high-humidity atmosphere, or light or heat energy may be applied to promote the conversion to silica.

The antifouling base of the present invention is an antifouling base which is subjected to the above-mentioned antifouling treatment on the surface of a substrate which is easily adhered to sebum, fingerprints, sweat, cosmetics, etc., such as a display surface of a cellular phone, a display surface of a liquid crystal panel or a touch panel, will be.

Hereinafter, an example of a cell phone in which an antifouling layer is formed using the coating composition of the present invention will be described with reference to the drawings.

Figs. 1 and 2 are views showing an example of a cellular phone.

Fig. 1 shows the entirety of a cellular phone, and includes various operation keys 1 used for communication and the like, various types of information relating to the telephone (telephone number, radio wave condition, battery remaining amount, etc.) ), A microphone (3), and a speaker (4). The image display device 2 specifically includes a liquid crystal display (LCD), an organic electroluminescent display (organic EL display), and the like.

Figure 2 shows the section AA 'of Figure 1. The image display device 2 is provided inside the case 5 of the cellular phone and the transmission window member 6 is provided on the image display device 2. [ The transmission window member 6 is generally made of resin having good light transmittance and made of acrylic, polycarbonate or the like.

In the present invention, an inorganic surface film 6a and an antioxidant layer 6b made of a compound represented by the formula (1) are provided in order in the transmission window member 6.

A transparent inorganic surface film 6a is formed on the transmission window member 6 by a sputtering method. As the material of the inorganic surface film 6a, a polysilazane based inorganic film can be used.

The antifouling layer 6b on the surface can be formed by coating and drying by spraying using a coating composition containing a compound represented by the formula (1) as a solute.

[Example]

The substrate after the antifouling treatment was evaluated by the following method. The evaluation items and the method are explained.

(Evaluation 1) Appearance

The evaluation sample was visually observed in the dark room under the illumination of 500 lux or more of a fluorescent lamp to determine whether the coating was cloudy or stained.

(Evaluation 2) sebum adhesion property

The evaluation sample was visually observed by pressing the cheek against the adhered state of the sebum. The evaluation standard was such that the adhesion state of the untreated sheet glass was poor and the adherence of the sebum was apparently small as compared with this.

(Evaluation 3) sebum removal property

An evaluation sample of the following (evaluation 4) was rubbed lightly ten times reciprocally with a nonwoven fabric made of cellulose (Ben Coat, manufactured by Asahi Chemical Industry Co., Ltd.), and the remaining side of the sebum was visually observed. The evaluation criterion was that the one with almost no sebum was good and the one with obvious sebaceous remained poor.

(Evaluation 4) Abrasion resistance

The contact angle of the slide operation portion with respect to water was measured by pressing a copy paper (super-white ascreated product) with a load of 9.8 N / cm ² on the sample, and the number of slide operations until the contact angle became less than 90 . The test was carried out three times or more, and the average value was evaluated. On the other hand, if the test method has an abrasion resistance of about 50,000 times, it is considered to have practically sufficient abrasion resistance.

On the other hand, as the film thicknesses described in the following examples and comparative examples, the film on the Si (100) substrate formed simultaneously with the evaluation sample was measured with an ellipsometer (DHA-FR manufactured by Mizugi Optical Co., Ltd.). In addition, the contact angle was measured with a contact angle meter (DM100 manufactured by Kyowa Interface Science Co., Ltd.) for the water contact angle of the evaluation sample surface.

Example 1

1 part by weight of a compound represented by the following formula (2) was mixed with 4 parts by weight of perfluorohexane (boiling point: 56 DEG C) and 1,1,1,3,3-pentafluorobutane (boiling point: 40 DEG C) And 195 parts by weight of a mixed solvent. This coating composition was coated on a glass substrate (slide glass S1225, product of Azuwa) by a spray method and dried at 50 DEG C for 30 minutes. The film thickness of the formed antifouling layer was 8.4 nm and the contact angle was 116 °. The outer appearance of the coating film was transparent without any unevenness, and both sebum adhesion and sebum removal were good. The abrasion resistance was 95,763. The results are shown in Table 1.

[Chemical Formula 5]

In the formula (2), the number of repeating units 1-10 of the repeating unit having trimethoxysilane in its side chain represents a mixture of 1 to 10 repeating units.

Example 2

1 part by weight of the compound represented by the formula (2) was mixed with 4 parts by weight of perfluorohexane (boiling point: 56 DEG C) and 1,1,1,2,2,3,3,4,5,5, And 195 parts by weight of 5-undecafluoro (trifluoromethyl) pentane (boiling point 56 ° C) were prepared. This coating composition was coated on a glass substrate (slide glass S1225, product of Azuwa) by a spray method and dried at 50 DEG C for 30 minutes. The film thickness of the formed antifouling layer was 9.2 nm and the contact angle was 115 °. The outer appearance of the film was transparent without any unevenness, and both sebum adhesion and sebum removal were good. The abrasion resistance was 88,140. The results are shown in Table 1.

Example 3

1 part by weight of the compound represented by the formula (2) was dissolved in a mixed solvent of 4 parts by weight of perfluorohexane (boiling point: 56 DEG C) and 195 parts by weight of methyl nano fluorobutyl ether (boiling point: 61 DEG C) Ready. This coating composition was coated on a glass substrate (slide glass S1225, product of Azuwa) by a spray method and dried at 50 DEG C for 30 minutes. The film thickness of the formed antifouling layer was 8.8 nm, and the contact angle was 116 deg. The outer appearance of the film was transparent without any irregularity, and both sebum adhesion and sebum removal were good. The abrasion resistance was 92,598. The results are shown in Table 1.

Example 4

Polysilazane solution (Arc Amica NL120A-05 manufactured by AZ Electronic Material Co., Ltd.) was applied to an acrylic substrate with a hard coat (Acrylate MR-200 manufactured by Mitsubishi Rayon Co., Ltd.) by a spray method and allowed to stand in an air atmosphere for one day To form a polysilazane thin film (film thickness: 93 nm). Thereafter, the coating composition used in Example 2 was coated by a spraying method under the same conditions as in Example 2. The film thickness of the antifouling layer was 8.5 nm and the contact angle was 117 °.

The outer appearance of the film was transparent without any unevenness, and both sebum adhesion and sebum removal were good. The abrasion resistance was 66,031 times.

Comparative Example 1

As a coating composition, 1 part by weight of the compound represented by the formula (2) was dissolved in 199 parts by weight of perfluorohexane (boiling point: 56 DEG C). This coating composition was coated on a glass substrate (slide glass S1225 manufactured by Azuwa Yarn) under the same conditions as in Example 1 by spraying. Appearance of coating was obviously cloudy. Since the outer appearance of the coating film was defective, evaluation of sebum adhesion, sebum removing ability and abrasion resistance was stopped.

Comparative Example 2

1 part by weight of the compound represented by the formula (2) was prepared by dissolving 4 parts by weight of perfluorohexane (boiling point 56 DEG C) and 195 parts by weight of NovecHFE7200 (manufactured by Asahi Glass Co., Ltd., boiling point: 76 DEG C) in a mixed solvent. This coating composition was coated on a glass substrate (slide glass S1225 manufactured by Azuwa Yarn) under the same conditions as in Example 1 by spraying. The appearance of the film was transparent, but a circular shape (stain) was visually recognizable. Since the outer appearance of the coating film was defective, evaluation of sebum adhesion, sebum removing ability and abrasion resistance was stopped.

Comparative Example 3

1 part by weight of the compound represented by the formula (2) was dissolved in a mixed solvent of 4 parts by weight of perfluorohexane (boiling point 56 DEG C) and 195 parts by weight of Florinate FC-40 (boiling point 155 DEG C) manufactured by Sumitomo 3M Co. I prepared it. This coating composition was coated on a glass substrate (slide glass S1225 manufactured by Azuwa Yarn) under the same conditions as in Example 1 by spraying. The outer appearance of the coating was transparent, but an irregular shape (amoeba shape) which can be visually recognized occurred. Since the outer appearance of the coating film was defective, evaluation of sebum adhesion, sebum removing ability and abrasion resistance was stopped.

Comparative Example 4

The coating composition used in Example 2 was directly coated on the acrylic substrate with hard coat used in Example 4 by spraying. The film thickness of the antifouling layer was 9.9 nm, and the contact angle was 116 °. The outer appearance of the coating film was transparent without any unevenness, and both sebum adhesion and sebum removal were good. However, the abrasion resistance was 7,379 times lower.

Comparative Example 5

The solute of the coating composition used in Example 2 was deposited on the glass substrate used in Example 2 by vacuum evaporation. The background pressure of vacuum deposition was 10 < ^-3 > Pa, and the solubility of the coating composition in the glass beaker was increased from room temperature to 500 DEG C over a period of about 30 minutes. The formed film had a film thickness of 7.2 nm and a contact angle of 117 °. The outer appearance of the film was transparent without any unevenness, and both sebum adhesion and sebum removal were good. However, the abrasion resistance was 42,217 times, which was lower than that of Example 2.

Comparative Example 6

The coating composition used in Example 2 was formed on the glass substrate used in Example 2 by dipping. The dip was immersed at room temperature for 24 hours and pulled up at a speed of about 10 mm / sec. The film thickness of the formed film was 5 nm or less and measurement was impossible. The contact angle was 117 °. The outer appearance of the film was transparent without any unevenness, and both sebum adhesion and sebum removal were good. However, the abrasion resistance was 4,701 times lower.

Comparative Example 7

A SiO ₂ thin film (with a thickness of 101 nm) was formed on the acrylic substrate with the hard coat used in Example 4 by the sputtering method. The sputtering was performed by the ion beam method and the Ar ion beam of 700 eV was irradiated to the fused quartz target under the background pressure of 10 ^-3 Pa. Thereafter, the coating agent used in Example 2 was coated by spraying. The film thickness of the antifouling layer was 8.9 nm and the contact angle was 115 °. The outer appearance of the film was transparent without any unevenness, and both sebum adhesion and sebum removal were good. However, the abrasion resistance was lower at 20,558 compared to Example 4. [

The results of the respective Examples and Comparative Examples are summarized in Table 1. In Table 1, the solvent A is perfluorohexane (boiling point 56 ° C), the solvent B is 1,1,1,3,3-pentafluorobutane (boiling point 40 ° C), the solvent C is 1,1,1,3,3- , 1,2,2,3,3,4,5,5,5-undecafluoro (trifluoromethyl) pentane (boiling point 56 DEG C), solvent D was methylnonafluorobutyl ether (boiling point 61 DEG C) Solvent E is NovecHFE7200 (boiling point 76 ° C) manufactured by Asahi Glass Co., Ltd. Solvent F is Florinate FC-40 (boiling point 155 ° C) manufactured by Sumitomo 3M Ltd.

By using the coating composition and the surface treatment method of the present invention, it is possible to form an antifouling film having excellent antifouling property, transparency and practically sufficient durability at low cost, so that it can be used for a cellular phone, a display device and the like.

1 Operation keys
2-image display device
3 microphone (mouthpiece)
4 Speakers
5 cases
6 transmission window member
6a inorganic surface film
6b pentagonal layer

Claims (10)

A composition for coating comprising a perfluoroalkylene ether group in a molecule main chain and a compound having a hydrolyzable group containing a silicon atom in a side chain, the perfluoroalkylene ether group being contained in a solvent, wherein the solvent contains at least one of a fluorinated hydrocarbon and a fluorinated ether And the difference between the maximum value and the minimum value of the boiling point of the fluorine-based solvent in the mixed solvent is within 25 占 폚, the boiling point of the fluorine-
Wherein the fluorine-based solvent is 1,1,1,3,3-pentafluorobutane, perfluorohexane, 1,1,1,2,2,3,3,4,5,5-undecafluoro 4- (trifluoromethyl) pentane, or methylnonafluorobutyl ether. The coating composition according to claim 1, wherein the perfluoroalkylene ether group is represented by the following formula (1-1), and the hydrolyzable group containing the silicon atom is represented by the following formula (1-2).
[Chemical Formula 1]

(Wherein n is an integer of 1 to 5, m is an integer of 0 to 2, and R ¹ is a hydrolyzable group.) The coating composition according to claim 2, wherein the compound is a compound represented by the following formula (1).
(2)

(Wherein Rf is a linear or branched perfluoroalkyl group having 1 to 16 carbon atoms, Y is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, R ¹ is a halogen atom, -OR ³ group, -OCOR ³ group, -OC (R ³ ) = C (R ⁴ ) ₂ group, -ON = C (R ³ ) ₂ group and -ON = C (R ⁵ ) ₂ group, and R ³ represents an aliphatic hydrocarbon group or represents an aromatic hydrocarbon group, R ⁴ represents a hydrogen atom or an alkyl group having a carbon number of 1~3, R ⁵ represents a divalent aliphatic hydrocarbon group having a carbon number of 3~6, q is an integer of 1 to 50, m is from 0 to 2 And r represents an integer of 1 to 10.) The coating composition according to claim 3, wherein R ¹ is at least one group selected from a chlorine atom, -OCH ₃ group, and -OC ₂ H ₅ group. delete The process according to claim 1, wherein the mixed solvent is 1,1,1,3,3-pentafluorobutane, perfluorohexane, 1,1,1,2,2,3,3,4,5,5, Wherein the solvent is a mixed solvent of two kinds of fluorinated solvents selected from 5-undecafluoro-4- (trifluoromethyl) pentane and methyl nonafluorobutyl ether. An anti-fouling treatment method for performing an anti-fouling treatment by coating a surface of an inorganic substrate or a surface of an inorganic surface film formed on an inorganic or organic substrate, wherein the coating on the surface of the inorganic substrate or the surface of the inorganic surface film is a first Wherein the coating composition is coated by a spraying method. 8. The antifouling treatment method according to claim 7, wherein the inorganic surface film is an inorganic surface film formed by applying a polysilazane solution by a spray method. An antifouling base material having an antifouling layer on a surface of a base material or a surface of an inorganic surface film formed on a base material, wherein the antifouling layer is a antifouling layer formed by the antifouling treatment method according to claim 7. The antifouling substrate according to claim 9, wherein the antifouling base material is a cellular phone having an image display section and an inner pore layer formed on a surface of the image display section.

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