KR20230043307A - Surface treatment including perfluoropolyether-based modified silane compound that can be used for vacuum deposition with electron beam heating and method for forming a coating layer - Google Patents

Abstract

The present invention relates to a surface treatment including a perfluoropolyether-based modified silane compound that can be used for vacuum deposition in an electron beam heating method and a method for forming a coating layer by using the same. To this end, the surface treatment comprises a surface treatment compound and a solvent including perfluoropolyether-based modified silane in the following Chemical Formula 1 and is applied to form a coating layer in a vacuum deposition method. [Chemical Formula 1] Rf-(OCF_2CF_2)p-(OCF_2)q-CF_2CH_2O-(CH_2)n-Si(OR_3)_3. In Chemical Formula 1, Rf is a linear or branched monatomic perfluoroalkyl group with the carbon number being 1 to 4, the ratio of p/q is within the range from 0.4 to 0.8, n is an integer between 3 and 5, and R is an alkyl group of the carbon number being 1 to 4.

Description

SURFACE TREATMENT INCLUDING PERFLUOROPOLYETHER-BASED MODIFIED SILANE COMPOUND THAT CAN BE USED FOR VACUUM DEPOSITION WITH ELECTRON BEAM HEATING AND METHOD FOR FORMING A COATING LAYER}

It relates to a surface treatment agent containing a perfluoropolyether-modified silane compound capable of vacuum deposition by electron beam heating method and a method for forming a coating layer using the same, and in detail, the ratio of perfluoroethylene oxide to perfluoromethylene oxide is 0.4-0.8 And, it relates to a surface treatment agent containing a perfluoropolyether-modified silane compound and a method of forming a coating layer including the same.

In general, perfluoropolyether-containing compounds have physical properties such as oil repellency, chemical resistance, lubricity, release property and antifouling property due to their very low surface energy. Because of these properties, perfluoropolyether-containing compounds are widely used to form water and oil repellent antifouling agents for paper and textiles, lubricants for magnetic recording media, oil repellants for precision machines, release agents, and protective coatings for optical materials. However, since general perfluoropolyether-containing compounds having such characteristics have weak adhesiveness and poor adhesion to the substrate, it is difficult to form a solid coating film firmly bonded to the substrate.

In contrast, silane coupling agents are widely known as a means of establishing a tight bond between an organic compound and the surface of a material such as glass or cloth. The silane coupling agent has an organic functional radical and a reactive silyl radical (typically, an alkoxysilyl radical) in its molecule, and the alkoxysilyl radical is converted into a siloxane through a self-condensation reaction with moisture in the air to form a coating.

At the same time, the silane coupling agent can form a strong coating film having durability by forming chemical and physical bonds with the glass or metal surface. Therefore, in recent years, a perfluoropolyester-modified silane compound using the low surface energy of perfluoropolyether and using the adhesive ability of the silane coupling agent to various substrates is used as a surface treatment agent having an antifouling function. there is.

In Korean Patent Registration No. 10-0959850, in preparing a perfluoropolyether-modified silane compound capable of vacuum deposition, methylene oxide, ethylene oxide, A method of increasing durability against the external environment by imparting propylene is proposed.

In Korean Patent Registration No. 10-2187756, in preparing a perfluoropolyether-modified silane compound capable of vacuum deposition, methylene oxide and pentylene are used as a spacer functional group between a perfluoropolyether functional group and a silane functional group. It suggests a method to increase durability against the external environment by giving

However, the compounds disclosed in the above-described technology have limitations in not sufficiently lowering the friction coefficient, which is a physical property fundamentally required for antifouling coatings on display windows.

1. Korean Patent Registration No. 10-0959850 2. Korean Patent Registration No. 10-2187756

The present invention is intended to solve the above problems, and includes a perfluoropolyether-based modified silane compound that has a sufficiently low friction coefficient, excellent durability, and can be vacuum deposited by electron beam heating method suitable for forming a coating film for display windows. It is to provide a surface treatment agent that does.

In addition, it is to provide a method of forming a coating layer using a surface treatment agent containing a perfluoropolyether-modified silane compound capable of vacuum deposition by the electron beam heating method.

The surface treatment agent including a perfluoropolyether-modified silane compound capable of vacuum deposition by electron beam heating according to an embodiment of the present invention includes a surface treatment compound represented by Chemical Formula 1 below and a solvent.

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ O-(CH ₂ )n-Si(OR ₃ ) ₃ --------------[Formula One]

(The surface treatment compound of Formula 1 is a perfluoropolyether-modified silane compound, a perfluoropolyether-modified silane having a number average molecular weight of 2,000 to 5,000, and a partially hydrolyzed condensate of the perfluoropolyether-modified silane. or a mixture thereof, wherein Rf in Formula 1 is a linear or branched monovalent perfluoroalkyl group having 1 to 4 carbon atoms, the ratio of p/q is in the range of 0.4 to 0.8, and n is 3 to 5 is an integer, and R is an alkyl group having 1 to 4 carbon atoms.)

In one embodiment of the present invention, the coating layer formed of the surface treatment agent has a friction coefficient of 0.03-0.05, and even after the abrasion resistance test using a rubber eraser, the value of the water contact angle falling from the value before the test is 10 ° or less, It is characterized in that even after the rubber eraser abrasion test in an ethanol atmosphere, the value of the water contact angle falling from the value before the test is 10 ° or less.

A coating layer forming method according to an embodiment of the present invention includes preparing a surface treatment agent for forming a coating layer containing a surface treatment compound and a solvent, and forming a coating layer containing the surface treatment compound as a main component, The treatment compound includes a perfluoropolyether-modified silane represented by the following formula (1) and having a number average molecular weight of 2,000 to 5,000, a partially hydrolyzed condensate of the perfluoropolyether-modified silane, or a mixture thereof.

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ O-(CH ₂ )n-Si(OR ₃ ) ₃ --------------[Formula One]

In Formula 1, Rf is a linear or branched monovalent perfluoroalkyl group having 1 to 4 carbon atoms, the ratio of p/q is in the range of 0.4 to 0.8, n is an integer of 3 to 5, and R is 1 carbon atom. It is an alkyl group between 4 to 4.

As an illustrative example, the forming of the coating layer may include evaporating the surface treatment compound by heating the tablet impregnated with the surface treatment agent in a vacuum container and depositing the evaporated surface treatment compound on the surface of the target object to be treated. Include steps.

As an illustrative example, the target object is preferably a display window.

The coating layer has a friction coefficient of 0.03-0.05, and even after the abrasion resistance test using a rubber eraser, the water contact angle is less than 10 ° from the value before the test, and even after the rubber eraser abrasion test in an ethanol atmosphere, the water contact angle is the same as before the test. It is characterized in that the decrease in value is 10 ° or less.

According to the present invention, it is possible to prepare a surface treatment agent for deposition for forming a coating layer having a low friction coefficient, excellent abrasion resistance, and excellent chemical resistance. The method for forming a coating layer using the above-described surface treatment agent can form a coating layer having a low friction coefficient, excellent abrasion resistance, and excellent chemical resistance.

Hereinafter, the surface treatment agent of the present invention and a method of forming a coating layer using the same will be described in more detail. Since the present invention can have various changes and various forms, specific embodiments will be described in detail in the text. However, it should be understood that this is not intended to limit the present invention to the specific disclosed form, and includes all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In this application, terms such as "comprise" or "having" are intended to designate that there is a feature, component, step, process, composition, or combination thereof described in the specification, but one or more other features or components, It should be understood that the presence or addition of any step, process, composition or combination thereof is not precluded.

In addition, unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

Surface treatment agent for coating layer formation

The surface treatment agent including a perfluoropolyether-modified silane compound capable of vacuum deposition by electron beam heating method according to an embodiment of the present invention includes a surface treatment compound represented by Chemical Formula 1 and a solvent.

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ O-(CH ₂ )n-Si(OR ₃ ) ₃ --------------[Formula One]

In Formula 1, Rf is a linear or branched monovalent perfluoroalkyl group having 1 to 4 carbon atoms, the ratio of p/q is in the range of 0.4 to 0.8, n is an integer of 3 to 5, and R is 1 carbon atom. It is an alkyl group between 4 to 4.

The surface treatment compound represented by Chemical Formula 1 of the present invention preferably has a number average molecular weight of 2,000 to 5,000. If the molecular weight is too small, there is a problem in that the compound is not settled on the object to be treated during the vacuum deposition process, and if the molecular weight is too large, there is a problem in that the compound is thermally decomposed. A feature of the present invention is that the p/q ratio is 0.4-0.8. If the ratio of p / q is less than 0.4, excessive manufacturing cost occurs due to instability during manufacture of perfluoropolyether, and if the ratio is greater than 0.8, there is a problem in that the wear resistance of the vacuum deposited coating layer is lowered.

The solvent includes at least one solvent. Examples of the solvent include fluorine-modified aliphatic hydrocarbon solvents (perfluoroheptane, perfluorooctane and perfluorodecane), fluorine-modified aromatic hydrocarbon solvents (m-xylene hexafluoride and benzotrifluoride), fluorine-modified Ether solvents (methylperfluorobutylether and perfluoro(2-butyltetrahydrofuran)), fluorine-modified alkylamine solvents (perfluorotributylamine and perfluorotripentylamine), hydrocarbon solvents (petroleum benzine, mineral spirits, toluene and xylene), and ketone solvents (acetone, methyl ethyl ketone and methyl isobutyl ketone). Among these, it is preferable to use a fluorine-modified solvent from the viewpoint of solubility and wettability.

The surface treatment agent containing perfluoropolyether-modified silane, which is the above-described surface treatment compound, can be coated on an object to be treated to form a coating layer having a low friction coefficient and excellent physical properties such as abrasion resistance and chemical resistance.

The amount of the surface treatment compound included in the surface treatment agent may be 10 to 70% by weight.

Method for forming a coating layer using a surface treatment agent for forming a coating layer

In order to form the antifouling coating layer according to the present invention, first, a surface treatment agent for forming a coating layer containing a surface treatment compound and a solvent is prepared.

The surface treatment compound applied to the surface treatment agent is a perfluoropolyether-modified silane represented by Formula 1 below and having a number average molecular weight of 2,000 to 5,000, a partial hydrolysis condensate of the perfluoropolyether-modified silane, or including mixtures thereof.

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ O-(CH ₂ )n-Si(OR ₃ ) ₃ --------------[Formula One]

In Formula 1, Rf is a linear or branched monovalent perfluoroalkyl group having 1 to 4 carbon atoms, the ratio of p/q is in the range of 0.4 to 0.8, n is an integer of 3 to 5, and R is 1 carbon atom. It is an alkyl group between 4 to 4.

Subsequently, a coating layer containing a surface treatment compound as a main component is formed using a vacuum deposition method. As an illustrative example, the forming of the coating layer may include evaporating the surface treatment compound by heating the tablet impregnated with the surface treatment agent in a vacuum container and depositing the evaporated surface treatment compound on the surface of the target object to be treated. Include steps.

As an illustrative example, the target object is preferably a display window.

The coating layer formed by the above method has a friction coefficient of 0.03-0.05, and even after the abrasion resistance test using a rubber eraser, the value of the water contact angle falling from the value before the test is 10 ° or less, and even after the rubber eraser abrasion test in an ethanol atmosphere, It is characterized in that the value of the water contact angle falling from the value before the test is 10 ° or less. The abrasion resistance test is an abrasion resistance test using a rubber eraser, which uses a method of measuring the water contact angle before and after the abrasion resistance of the coating layer even after 3,000 reciprocations at a speed of 40 times per minute at a weight of 500 g.

Preparation Example 1

100.0 g of the compound of Formula 2 below, 7.2 g of 3-Bromopropene, and 3.4 g of KBr were put in a 250 ml three-necked flask equipped with a cooling tube and a stirrer, and the mixture was stirred at 70° C. for 48 hours. Then, the mixture was extracted with a fluorine-based solvent and washed with dilute sulfuric acid to obtain a compound represented by Chemical Formula 3.

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ OH------------[Formula 2]

(The number average molecular weight is about 2,500, Rf is a perfluoroalkyl group, and the ratio of p/q is 0.4-0.8. )

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ OCH ₂ CHCH ₂ ------------[Formula 3]

(The number average molecular weight is about 2,500, Rf is a perfluoroalkyl group, and the ratio of p/q is 0.4-0.8. )

Subsequently, 50.0 g of the compound represented by Chemical Formula 3, 7.0 g of Trimethoxysilane, 0.01 g of a platinum-based catalyst, and 50.0 g of a fluorine-based solvent, FC-3283, were added to a 250 ml three-necked flask equipped with a cooling tube and a stirrer and incubated at 65° C. for 24 hours. while stirring. After extraction with a fluorine-based solvent, residual solvent was removed in vacuo to obtain a compound represented by Formula 4.

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ O(CH ₂ ) ₃ Si(OCH ₃ ) ₃ --------------[Formula 4]

(The number average molecular weight is about 2,500, Rf is a perfluoroalkyl group, and the ratio of p/q is 0.4-0.8. )

Comparative Preparation Example 1

100.0 g of the compound of Formula 2, 7.2 g of 3-Bromopropene, and 3.4 g of KBr were put in a 250 ml three-necked flask equipped with a cooling tube and a stirrer, and stirred at 70 ° C for 48 hours. Washing with dilute sulfuric acid gave a compound represented by Formula 3.

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ OH------------[Formula 2]

(The number average molecular weight is about 2,500, Rf is a perfluoroalkyl group, and the ratio of p/q is 0.9-1.1. )

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ OCH ₂ CHCH ₂ ------------[Formula 3]

(The number average molecular weight is about 2,500, Rf is a perfluoroalkyl group, and the ratio of p/q is 0.9-1.1. )

Subsequently, 50.0 g of the compound represented by Chemical Formula 3, 7.0 g of Trimethoxysilane, 0.01 g of a platinum-based catalyst, and 50.0 g of a fluorine-based solvent, FC-3283, were added to a 250 ml three-necked flask equipped with a cooling tube and a stirrer and incubated at 65° C. for 24 hours. while stirring. After extraction with a fluorine-based solvent, residual solvent was removed in vacuo to obtain a compound represented by Formula 4.

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ O(CH ₂ ) ₃ Si(OCH ₃ ) ₃ --------------[Formula 4]

(The number average molecular weight is about 2,500, Rf is a perfluoroalkyl group, and the ratio of p/q is 0.9-1.1. )

Preparation Example 2

100.0 g of the compound of Formula 2, 9.02 g of 3-Bromopropene, and 3.4 g of KBr were put in a 250 ml three-necked flask equipped with a cooling tube and a stirrer, and stirred at 70° C. for 48 hours. After extraction with a fluorine-based solvent and washing with dilute sulfuric acid, a compound represented by Chemical Formula 5 was obtained.

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ OH------------[Formula 2]

(The number average molecular weight is about 2,500, Rf is a perfluoroalkyl group, and the ratio of p/q is 0.4-0.8 .)

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ O(CH ₂ ) ₃ CHCH ₂ ------------[Formula 5]

(The number average molecular weight is about 2,500, Rf is a perfluoroalkyl group, and the ratio of p/q is 0.4-0.8. )

50.0 g of the compound represented by Chemical Formula 3, 7.0 g of Trimethoxysilane, 0.01 g of platinum-based catalyst, and 50.0 g of fluorine-based solvent FC-3283 (manufactured by 3M) were added to a 250 ml three-necked flask equipped with a cooling tube and a stirrer, and the temperature was 24 at 65 ° C. Stir for an hour. After extraction with a fluorine-based solvent, residual solvent was removed in vacuo to obtain a compound represented by Formula 6.

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ O(CH ₂ ) ₅ Si(OCH ₃ ) ₃ --------------[Formula 6]

(The number average molecular weight is about 2,500, Rf is a perfluoroalkyl group, and the ratio of p/q is 0.4-0.8.)

Comparative Preparation Example 2

100.0 g of the compound of Formula 2, 9.02 g of 3-Bromopropene, and 3.4 g of KBr were put in a 250 ml three-necked flask equipped with a cooling tube and a stirrer, and stirred at 70° C. for 48 hours. After extraction with a fluorine-based solvent and washing with dilute sulfuric acid, a compound represented by Chemical Formula 5 was obtained.

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ OH------------[Formula 2]

(The number average molecular weight is about 2,500, Rf is a perfluoroalkyl group, and the ratio of p/q is 0.9-1.1 .)

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ O(CH ₂ ) ₃ CHCH ₂ ------------[Formula 5]

(The number average molecular weight is about 2,500, Rf is a perfluoroalkyl group, and the ratio of p/q is 0.9-1.1. )

50.0 g of the compound represented by Chemical Formula 3, 7.0 g of Trimethoxysilane, 0.01 g of platinum-based catalyst, and 50.0 g of fluorine-based solvent FC-3283 (manufactured by 3M) were added to a 250 ml three-necked flask equipped with a cooling tube and a stirrer, and the temperature was 24 at 65 ° C. Stir for an hour. After extraction with a fluorine-based solvent, residual solvent was removed in vacuo to obtain a compound represented by Formula 6.

Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ O(CH ₂ ) ₅ Si(OCH ₃ ) ₃ --------------[Formula 6]

(The number average molecular weight is about 2,500, Rf is a perfluoroalkyl group, and the ratio of p/q is 0.9-1.1. )

Example 1

A surface treatment coating agent was prepared by dissolving 20 parts by weight of the perfluoropolyether-modified alkylsilane (Formula 4) prepared in Preparation Example 1 in a fluorine solvent (FC-3283). After providing 0.5 g of the surface treatment coating agent to a tablet made of steel wool, the solvent was volatilized to prepare a tablet for vacuum deposition. It was heated in a vacuum evaporator and coated on a glass plate to a thickness of about 0.1 to 0.2 nanometers.

Example 2

A surface treatment coating agent was prepared by dissolving 20 parts by weight of the perfluoropolyether-modified alkylsilane (Formula 6) prepared in Preparation Example 2 in a fluorine solvent (FC-3283). After providing 0.5 g of the surface treatment coating agent to a tablet made of steel wool, the solvent was volatilized to prepare a tablet for vacuum deposition. It was heated in a vacuum evaporator and coated on a glass plate to a thickness of about 0.1 to 0.2 nanometers.

Comparative Example 1

A surface treatment coating agent was prepared by dissolving 20 parts by weight of the perfluoropolyether-modified alkylsilane (Formula 4) prepared in Comparative Preparation Example 1 in a fluorine solvent (FC-3283). After providing 0.5 g of the surface treatment coating agent to a tablet made of steel wool, the solvent was volatilized to prepare a tablet for vacuum deposition. It was heated in a vacuum evaporator and coated on a glass plate to a thickness of about 0.1 to 0.2 nanometers.

Comparative Example 2

A surface treatment coating agent was prepared by dissolving 20 parts by weight of the perfluoropolyether-modified alkylsilane (Formula 6) prepared in Comparative Preparation Example 2 in a fluorine solvent (FC-3283). After providing 0.5 g of the surface treatment coating agent to a tablet made of steel wool, the solvent was volatilized to prepare a tablet for vacuum deposition. It was heated in a vacuum evaporator and coated on a glass plate to a thickness of about 0.1 to 0.2 nanometers.

The physical properties of the coating layers obtained in the above-described Examples and Comparative Examples 1 and 2 were evaluated in the following manner.

Test method 1

Abrasion resistance test:

The initial contact angle was measured using a contact angle measuring device (CEO, Phoenix 150). Using an abrasion tester (Daesung Precision Co., Ltd.), 3,000 reciprocations were performed at a speed of 40 times per minute under a condition in which a load of 500 g was applied to the rubber eraser. Then, the contact angle was measured using a contact angle measuring device (CEO, Phoenix 150).

Test method 2

Friction coefficient measurement test:

Using a friction coefficient measuring device (FPT-F1 manufactured by Labthink), copying paper was used as a friction element, and the dynamic friction coefficient was measured according to ASTM D4917. Specifically, in a situation where the glass coated with the surface treatment agent was brought into contact with copy paper and a load of 200 g was applied thereon, the glass was moved at a speed of 150 mm per minute.

Test method 3

Chemical resistance test:

The initial contact angle was measured using a contact angle measuring device (CEO, Phoenix 150). Using an abrasion tester (Daesung Precision Co., Ltd.), 1,000 reciprocations were performed at a speed of 40 times per minute while dropping 95% pure ethanol at a rate of one drop per 5 seconds in a situation where a load of 500 g was applied to the rubber eraser. After sufficiently drying, the contact angle was measured. This can be referred to as a rubber eraser wear test under an ethanol atmosphere.

Referring to Table 1, looking at the contact angle change after the abrasion test, in the case of Examples 1 and 2, it can be seen that the contact angle change is smaller than that of Comparative Examples 1 and 2. Looking at the friction coefficient after the abrasion test, in the case of Examples 1 and 2, it was confirmed that the friction coefficient was about twice or more lower than that of Comparative Examples 1 and 2. In other words, it was confirmed that there is a correlation between the friction coefficient and the change in friction coefficient after the wear test.

Referring to Table 2, looking at the contact angle change after the chemical resistance test, it can be seen that Examples 1 and 2 are sequentially compared with Comparative Example 1 and Comparative Example 2, respectively, are relatively small. This is because in the perfluoropolyether-modified silane surface treatment compound, a small ratio of perfluoroethylene oxide to perfluoromethylene oxide reduces the friction coefficient and improves wear resistance, but does not cause a decrease in chemical resistance. It is something that can be checked.

The surface treatment agent according to the present invention can be used as a functional coating agent for antifouling and the like for optical products such as display windows.

Claims (6)

A surface treatment agent for forming a coating layer, comprising a surface treatment compound having a structure of Formula 1 and containing a perfluoropolyether-modified silane, and a solvent, which is applied to form a coating layer by a vacuum deposition method.
Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ O-(CH ₂ )n-Si(OR ₃ ) ₃ --------------[Formula One]
(The surface treatment compound of Formula 1 includes a perfluoropolyether-modified silane having a number average molecular weight of 2,000 to 5,000, a partial hydrolytic condensate of the perfluoropolyether-modified silane, or a mixture thereof, In 1, Rf is a linear or branched monovalent perfluoroalkyl group having 1 to 4 carbon atoms, the ratio of p/q is in the range of 0.4 to 0.8, n is an integer of 3 to 5, and R is 1 to 4 carbon atoms. It is an alkyl group between.) The method of claim 1, wherein the coating layer formed of the surface treatment agent has a friction coefficient of 0.03-0.05, and even after the abrasion resistance test using a rubber eraser, the value of the water contact angle falling from the value before the test is 10 ° or less, and A surface treatment agent for forming a coating layer, characterized in that even after the rubber eraser abrasion test, the value of the water contact angle falling from the value before the test is 10 ° or less. Preparing a surface treatment agent for forming a coating layer comprising a surface treatment compound of Formula 1 and a solvent; and
A method of forming a coating layer comprising forming a coating layer containing the surface treatment compound as a main component.
Rf-(OCF ₂ CF ₂ )p-(OCF ₂ )q-CF ₂ CH ₂ O-(CH ₂ )n-Si(OR ₃ ) ₃ --------------[Formula One]
(The surface treatment compound of Formula 1 includes a perfluoropolyether-modified silane having a number average molecular weight of 2,000 to 5,000, a partial hydrolytic condensate of the perfluoropolyether-modified silane, or a mixture thereof, In 1, Rf is a linear or branched monovalent perfluoroalkyl group having 1 to 4 carbon atoms, the ratio of p/q is in the range of 0.4 to 0.8, n is an integer of 3 to 5, and R is 1 to 4 carbon atoms. It is an alkyl group between.) The method of claim 3, wherein the forming of the coating layer comprises heating the tablet impregnated with the surface treatment agent in a vacuum container to evaporate the surface treatment compound, and depositing the evaporated surface treatment compound on the surface of the object to be treated. A method of forming a coating layer comprising the step of doing. The method of claim 4, wherein the target object is a window for a display. The third method, wherein the coating layer has a friction coefficient of 0.03-0.05, and even after the abrasion resistance test using a rubber eraser, the value of the water contact angle falling from the value before the test is 10 ° or less, and even after the rubber eraser abrasion test in an ethanol atmosphere, A method of forming a coating layer, characterized in that the value of the water contact angle falling from the value before the test is 10 ° or less.