Silane compound containing straight-chain perfluoropolyether group and preparation method thereof

Abstract

The invention belongs to the technical field of fluorosilicone polymer materials and surface treatment, and particularly relates to a silane compound containing a straight-chain perfluoropolyether group and a preparation method of the silane compound, the structural formula of the silane compound containing the straight-chain perfluoropolyether group is Rf-CH2-OC (O)-X1-CONQaT2-a (1), and the number-average molecular weight is 500-10000; in the formula, Rf is F (CF2) m-(OC4F8) p-(OC3F6) q-(OC2F4) r-(OCF2) sO-C (Z) F (CF2) n-, p, q, r and s are respectively independent and are integers between 0 and 200, the sum of p, q, r and s is not less than 1, the existence sequence and number of each repeating unit with p, q, r and s and included by brackets are arbitrary in the formula, m and n are integers between 0 and 30, and Z is F or CF3; a is 0 or 1, X1 is a divalent organic group, Q is hydrogen, phenyl or C1-22 alkyl, T is-Y-SiR1jR2-j, and Y is a divalent organic group. According to the silane compound containing the straight-chain perfluoropolyether group and the preparation method of the silane compound containing the straight-chain perfluoropolyether group, an article coated with the silane compound containing the straight-chain perfluoropolyether group has good hydrophobicity, oleophobicity, smoothness, steel wool abrasion resistance and eraser abrasion resistance.

Description

Technical Field

[0001] The invention relates to the technical field of fluorosilicone polymer materials and surface treatment, and in particular to a silane compound containing a linear perfluoropolyether group and a preparation method thereof. Background Art

[0002] With the rapid popularization of smart phones, tablet computers and car central control devices around the world, consumers require the device screen to provide excellent surface sliding properties when they touch the display panel with their fingers. In addition, the touch panel is easily contaminated by skin oil, sweat, cosmetics, etc. In order to form a functional film with better slipperiness and prevent the adhesion of fingerprints and other dirt on the substrate surface, researchers used fluorine-containing polymer compounds with high lubricity and high water and oil repellency.

[0003] When treating substrates, existing silane compounds containing perfluoropolyether groups can form a film layer with anti-fouling, stain removal, wear resistance and scratch resistance on the surface. On the one hand, it is because the perfluoropolyether in the polymer compound has the characteristics of low surface energy and high stability, and on the other hand, the siloxane groups in the molecule can undergo dehydration condensation reaction on the surface of the substrate to form chemical bonds and combine. The surface treatment agent containing the composition is evenly dispersed on the substrate by spraying or vapor deposition, and heated and cured to form a polymer coating with protective function. Since the thickness of the coating is only a few nanometers, it will not affect the surface appearance and light transmittance of the substrate.

[0004] Although the film layer prepared from the silane compound containing perfluoropolyether group currently involved has high wear resistance and can withstand reciprocating wear of steel wool for more than 5,000 times, or even up to tens of thousands of times, so that the surface dynamic friction coefficient of the film layer can be reduced to about 0.05, the perfluoropolyether modified silane compound has the problems of difficult synthesis process, many process steps, long process, special structure of raw materials and difficulty in obtaining, which leads to its high price, high production cost and inconvenience in use. Summary of the invention

[0005] Based on the above-mentioned existing technical problems, the present invention proposes a silane compound containing a linear perfluoropolyether group and a preparation method thereof.

[0006] In the first aspect, the present invention provides a silane compound containing a linear perfluoropolyether group, the structural formula of the silane compound containing a linear perfluoropolyether group is: Rf-CH2-OC(O)-X1-CONQ a T 2-a (1), the number average molecular weight is 500-10000.

[0007] In the structural formula of the above-mentioned silane compound containing a linear perfluoropolyether group, a is 0 or 1, X1 is a divalent organic group, and Q is hydrogen, phenyl or C1-22 alkyl.

[0008] Wherein Rf in the structural formula of the above-mentioned silane compound containing a linear perfluoropolyether group is F(CF2) m -(OC4F8) p -(OC3F6) q -(OC2F4) r -(OCF2) s OC(Z)F(CF2) n -.

[0009] Wherein p, q, r and s are independently and are integers between 0 and 200, the sum of p, q, r and s is not less than 1, the order and quantity of each repeating unit with p, q, r and s enclosed in brackets are arbitrary in the formula, m and n are integers between 0 and 30, and Z is F or CF3.

[0010] Preferably, the T is -Y-SiR1 j R2 3-j , wherein Y is a divalent organic group, R1 is an alkoxy group, a hydroxy group or a group that can be hydrolyzed to a hydroxy group, R2 is a C1-22 alkyl group, hydrogen, a phenyl group or a C1-22 alkyl group, j is independently an integer between 0 and 3, and the sum of j is not less than 1.

[0011] Preferably, the Rf is CF3-(OC2F4) r -(OCF2) s- OCF 2- (2), wherein the sum of r and s is an integer between 10 and 200; or Rf is F(CF2) m -(OC4F8) p -(OC3F6) q -(OC2F4) r -(OCF2) s OC(Z)F(CF2) n -, wherein m is an integer between 1 and 16, n is an integer between 0 and 2, r and s are independently an integer between 1 and 200, and the sum of p, q, r and s is an integer between 10 and 200.

[0012] Preferably, X1 is -(R3) g -X2-(R4) h -, wherein R3 and R4 are independently C1-6 alkyl or substituted C1-6 alkyl; g and h are independently 0 or 1; X2 is -O-, -S-, -(CH2) k -、-CH=CH-、-O(CH2)k O-, -O(CH2O) k -、-(CF2) k -, -Rf'-, -Het-, -Ar- or substituted -Ar-, k is independently an integer between 2 and 100 each time it appears; the -Het- is a cyclic organic compound containing a heteroatom; the -Ar- is an organic compound with aromaticity.

[0013] Preferably, the -Rf'- is

[0014] -(CF2) u -(OC4F8) v -(OC3F6) w -(OC2F4) x -(OCF2) y -OC(Z)F-(CF2) f -, wherein u is an integer between 1 and 16, f is an integer between 0 and 2, x and y are independently an integer between 1 and 200, the sum of v, w, x and y is an integer between 10 and 200, the order and quantity of each repeating unit enclosed in brackets with v, w, x and y in the formula are arbitrary, and Z is F or CF3.

[0015] Preferably, the -Het- is a ring containing a single heteroatom or a ring organic compound containing multiple heteroatoms, the heteroatom is an oxygen atom, a nitrogen atom or a sulfur atom; the -Ar- is o-, m- or p-phenylene, any two positions of which are substituted with nitrogen, oxygen or sulfur atom-containing aromatic groups, and any two positions of which are substituted with condensed ring aromatic groups.

[0016] In a second aspect, the present invention provides a method for preparing a silane compound containing a linear perfluoropolyether group, wherein the preparation method is:

[0017] S1. Perfluoropolyether methyl ester is reacted with an amidation reagent in the presence of a catalyst to convert it into perfluoropolyether acid, which is then reacted with an acyl halide reagent to generate the corresponding perfluoropolyether acyl halide, wherein the structural formula of the perfluoropolyether alcohol is: Rf-COOCH3, the structural formula of the perfluoropolyether acid is: Rf-CONH-X1-COOH(4), and the structural formula of the perfluoropolyether acyl halide is: Rf-CONH-X1-COC1.

[0018] S2. Reacting perfluoropolyether acyl halide with aminosilane coupling agent to obtain a silane compound containing a linear perfluoropolyether group, including a film of a surface treatment agent containing a silane compound containing a linear perfluoropolyether group, the structural formula of which is: Rf-CH2-OC(O)-X1-CONQ a T 2-a (1).

[0019] Specifically, Example 1 of Synthesis of a Silane Compound Containing a Straight-chain Perfluoropolyether Group: The preparation steps are as follows:

[0020] A1. Add 10g of perfluoropolyether modified methyl ester (number average molecular weight 3500-4000) with average composition CF3(OCF2CF2)r(OCF2)sOCF2COOCH3 (sum of r and s is 35-42) into a 100mL single-mouth round-bottom flask equipped with a stirrer, 15ml of 1,3-di(trifluoromethyl)benzene, amidation reagent, and 0.3g of 4-dimethylaminopyridine and stir at room temperature for 2h. After extraction with methanol and water, 9.8g of colorless transparent product was obtained by vacuum distillation, which is the perfluoropolyether carboxylic acid compound: CF3(OCF2CF2)r(OCF2) s OCF2CONHCH2CH2COOH.

[0021] A2. Add 9.8g of the carboxyl perfluoropolyether compound obtained by A1 and 15ml of 1,3-di(trifluoromethyl)benzene to a 100mL single-mouth round-bottom flask equipped with a dropping funnel and a stirring magnet, then add 0.31mL of oxalyl chloride, 0.2ml of DMF dissolved in 5mL of 1,3-di(trifluoromethyl)benzene and slowly drip it from the dropping funnel, then heat it to 50°C and stir for 2h, then slowly drip it into a 100mL single-mouth round-bottom flask equipped with 5ml of 1,3-di(trifluoromethyl)benzene, 4.2mL of diisopropylethylamine, and 4mL of di(3-trimethoxysilylpropyl)amine, and stir at room temperature for 2h. Add 40ml of perfluorohexane, extract three times with 18mL of methanol, and distill the volatile components of the fluorine phase under reduced pressure to obtain a colorless to light yellow product, which is the following perfluoropolyether silane compound A with trimethoxysilane at the end:

[0022] CF3(OCF2CF2) r (OCF2) s OCF2CONHCH2CH2CON[CH2CH2CH2Si(OCH3)3]2.

[0023] Specifically, Example 2 of Synthesis of a Silane Compound Containing a Straight-chain Perfluoropolyether Group: The preparation steps are as follows:

[0024] B1. Add 10g of perfluoropolyether modified methyl ester (number average molecular weight 3500-4000) with an average composition of CF3(OCF2CF2)r(OCF2)sOCF2COOCH3 (the sum of r and s is 35-42) into a 100mL single-mouth round-bottom flask equipped with a stirrer, 15ml of 1,3-di(trifluoromethyl)benzene, an amidation reagent, and 0.3g of 4-dimethylaminopyridine, and stir at room temperature for 2h. After extraction with methanol and water, 9.9g of colorless transparent product was obtained by vacuum distillation, which is a perfluoropolyether carboxylic acid compound: CF3(OCF2CF2)r(OCF2) s OCF2CH2CONHCH2CH2CH2COOH.

[0025] B2. In a 100ml single-mouth round-bottom flask equipped with a dropping funnel and a stirring magnet, add 9.9g of the carboxyl perfluoropolyether compound obtained by B1 and 15ml of 1,3-di(trifluoromethyl)benzene to dissolve it, then add 0.3ml of oxalyl chloride and 0.2ml of DMF dissolved in 5ml of 1,3-di(trifluoromethyl)benzene and slowly drop it in from the dropping funnel. Then heat it to 50℃ and stir for 4h. After cooling to room temperature, slowly drop it into a 100ml single-mouth round-bottom flask equipped with 5ml of 1,3-di(trifluoromethyl)benzene, 4.2ml of diisopropylethylamine and 4.1ml of di(3-trimethoxysilylpropyl)amine, and stir at room temperature for 2h. Add 40 ml of perfluorohexane, extract three times with 18 ml of methanol, and distill the volatile components of the fluorine phase under reduced pressure to obtain a colorless to light yellow product, which is the following perfluoropolyether silane compound B with trimethoxysilane at the end: CF3(OCF2CF2) r (OCF2) s OCF2CH2CONHCH2CH2CH2CON[CH2CH2CH2Si(OCH3)3]2.

[0026] Specifically, Example 3 of Synthesis of a Straight-chain Perfluoropolyether-containing Silane Compound: The preparation steps are as follows:

[0027] C1. Add 10g of perfluoropolyether modified alcohol (number average molecular weight 3500-4000) with average composition CF3(OCF2CF2)r(OCF2)sOCF2CH2OH (sum of r and s is 35-42), 15ml 1,3-di(trifluoromethyl)benzene, 0.555g phthalic anhydride, 0.3g 4-dimethylaminopyridine to a 100mL single-mouth round-bottom flask equipped with a stirrer, and stir at room temperature for 2h. After extraction with methanol and water, vacuum distillation was performed to obtain 10.1g of colorless transparent product, which is a perfluoropolyether carboxylic acid compound: CF3(OCF2CF2)r(OCF2)sOCF2CONHC6H4COOH.

[0028] C2. In a 100ml single-mouth round-bottom flask equipped with a dropping funnel, a thermometer and a stirrer, add 10.1g of the carboxyl perfluoropolyether compound obtained by C1 and 15ml of 1,3-di(trifluoromethyl)benzene to dissolve it, then add 0.3ml of oxalyl chloride and 0.2ml of DMF dissolved in 5ml of 1,3-di(trifluoromethyl)benzene and slowly drop it in from a dropping funnel, then heat to 50°C and stir for 4h, then cool to room temperature and slowly drop it into a 100ml single-mouth round-bottom flask filled with 5ml of 1,3-di(trifluoromethyl)benzene, 4.2ml of diisopropylethylamine and 4ml of di(3-trimethoxysilylpropyl)amine, and stir at room temperature for 5h. Add 40 mL of perfluorohexane, extract three times with 18 ml of methanol, and distill the volatile components of the fluorine phase under reduced pressure to obtain a colorless to light yellow product, which is the following perfluoropolyether silane compound C with trimethoxysilane at the end: CF3(OCF2CF2) r (OCF2) s OCF2CONHC6H4CON[CH2CH2CH2Si(OCH3)3]2.

[0029] In the third aspect, the surface treatment agent proposed by the present invention contains 0.01-30wt% of the silane compound containing a linear perfluoropolyether group, and the remaining components are solvents and additives; wherein the solvent is one or more of nonafluorobutyl methyl ether, nonafluorobutyl ethyl ether, tridecafluorohexyl methyl ether, hydrofluoroether, fluorocarbon compounds, and meta-trifluorotoluene, and the additive is one or more of perfluoropolyethers, organic acids, and organic bases.

[0030] In a fourth aspect, the present invention provides a method for preparing a film of a surface treatment agent containing a linear perfluoropolyether-based silane compound, the preparation method comprising a wet coating method:

[0031] Step 1: dilute the surface treatment agent to a dilution solution with a solid content concentration of 0.1wt%-0.4wt%.

[0032] Step 2: coating or spraying on the plasma-treated substrate and baking, and obtaining a thin film after cooling, wherein the baking temperature is 80-150° C., the baking time is 10-60 minutes, and the final cooling temperature is room temperature.

[0033] Also includes vapor deposition methods:

[0034] Step 1: Prepare the surface treatment agent into pills.

[0035] Step 2: Use an evaporator to load it onto a substrate on which silicon dioxide has been deposited to form a uniform surface coating to obtain a thin film.

[0036] Specifically, Example 1 of the surface treatment agent containing a silane compound of a straight-chain perfluoropolyether group is as follows: the perfluoropolyether-based silane compound A synthesized in Synthesis Example 1 is mixed with hydrofluoroether to a mass concentration of 20% to serve as the surface treatment agent 1; the surface treatment agent 1 is vapor-deposited onto the chemically strengthened glass by a vapor deposition method; at a vacuum pressure of less than 4×10-3Pa, silicon dioxide is first deposited onto the chemically strengthened glass by an electron beam deposition method to form a silicon dioxide film with a thickness of 10nm; and then the surface treatment agent 1 is deposited on each piece of chemically strengthened glass by a vacuum deposition method to a thickness of about 8-10nm; and then the chemically strengthened glass with the deposited film is placed in an environment of 60% humidity and 70°C for 2 hours for curing to form a surface treatment layer.

[0037] Specifically, Example 2 of the surface treatment agent containing a linear perfluoropolyether-based silane compound is as follows: the perfluoropolyether-based silane compound A synthesized in Synthesis Example 1 is mixed with an inert perfluoropolyether in a ratio of 8:2, and then the mixture is adjusted to a mass concentration of 20% with hydrofluoroether to serve as the surface treatment agent 2; the surface treatment agent 2 is vapor-deposited onto the chemically strengthened glass by a vapor deposition method, and at a vacuum pressure of less than 4x10-3Pa, silicon dioxide is first deposited onto the chemically strengthened glass by an electron beam deposition method with a thickness of 10nm to form a silicon dioxide film, and then the surface treatment agent 2 is deposited on each piece of chemically strengthened glass by a vacuum deposition method with a thickness of about 8-10nm; and then the chemically strengthened glass with the deposited film is placed in an environment of 60% humidity and 70°C for 2 hours for curing to form a surface treatment layer.

[0038] Specifically, Example 3 of the surface treatment agent containing a silane compound of a linear perfluoropolyether group is as follows: the perfluoropolyether-based silane compound B synthesized in Synthesis Example 2 is mixed with an inert perfluoropolyether in a ratio of 8:2, and then the mixture is adjusted to a mass concentration of 20% with hydrofluoroether to serve as the surface treatment agent 3; the surface treatment agent 3 is evaporated onto the chemically strengthened glass by a vapor deposition method, and at a vacuum pressure of less than 4x10-3Pa, silicon dioxide is first deposited on the chemically strengthened glass by an electron beam deposition method with a thickness of 10nm to form a silicon dioxide film, and then the surface treatment agent 3 is deposited on each piece of chemically strengthened glass by vacuum deposition with a thickness of about 8-10nm; and then the chemically strengthened glass with the deposited film is placed in an environment of 60% humidity and 70°C for 2 hours for curing to form a surface treatment layer.

[0039] Specifically, Example 4 of the surface treatment agent containing a silane compound of a linear perfluoropolyether group is as follows: the perfluoropolyether-based silane compound C synthesized in Synthesis Example 3 is mixed with an inert perfluoropolyether in a ratio of 8:2, and then the mixture is adjusted to a mass concentration of 20% with hydrofluoroether to serve as the surface treatment agent 4; the surface treatment agent 4 is vapor-deposited onto the chemically strengthened glass by a vapor deposition method, and at a vacuum pressure of less than 4x10-3Pa, silicon dioxide is first deposited onto the chemically strengthened glass by an electron beam deposition method with a thickness of 10nm to form a silicon dioxide film, and then the surface treatment agent 4 is deposited on each piece of chemically strengthened glass by vacuum deposition to a thickness of about 8-10nm; and then the chemically strengthened glass with the deposited film is placed in an environment of 60% humidity and 70°C for 2 hours for curing to form a surface treatment layer.

[0040] Specifically, Example 5 of the surface treatment agent containing a linear perfluoropolyether-based silane compound is as follows: the perfluoropolyether-based silane compound A synthesized in Synthesis Example 1 is mixed with a fluorinated hydrocarbon to a mass concentration of 20% to prepare a surface treatment agent 5; a commercially available spray coating device is used to uniformly spray the surface treatment agent 5 on the chemically strengthened glass at a flow rate of 50 mg / sec and a conveying line speed of 13 mm / sec; before coating, the surface of the chemically strengthened glass is subjected to a plasma treatment; and then the chemically strengthened glass with the spray-treated film is placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0041] Specifically, Example 6 of the surface treatment agent containing a linear perfluoropolyether-based silane compound is as follows: the perfluoropolyether-based silane compound A synthesized in Synthesis Example 1 is mixed with an inert perfluoropolyether in a ratio of 8:2, and then mixed with a fluorinated hydrocarbon to a mass concentration of 20% to prepare a surface treatment agent 6; a commercially available spray coating device is used to uniformly spray the surface treatment agent 5 on the chemically strengthened glass at a flow rate of 50 mg / sec and a conveying line speed of 13 mm / sec; before coating, the surface of the chemically strengthened glass needs to be subjected to a plasma treatment; and then the chemically strengthened glass with the spray-treated film is placed in an environment of 60% humidity and 70°C for 2 hours for curing to form a surface treatment layer.

[0042] Specifically, Example 7 of the surface treatment agent containing a linear perfluoropolyether-based silane compound is as follows: the perfluoropolyether-based silane compound B synthesized in Synthesis Example 2 is mixed with an inert perfluoropolyether in a ratio of 8:2, and then mixed with a fluorinated hydrocarbon to a mass concentration of 20% to prepare a surface treatment agent 7; a commercially available spray coating device is used to uniformly spray the surface treatment agent 5 on the chemically strengthened glass at a flow rate of 50 mg / sec and a conveying line speed of 13 mm / sec; before coating, the surface of the chemically strengthened glass is subjected to a plasma treatment; and then the chemically strengthened glass with the spray-treated film is placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0043] Specifically, Example 8 of the surface treatment agent containing a linear perfluoropolyether-based silane compound is as follows: the perfluoropolyether-based silane compound C synthesized in Synthesis Example 3 is mixed with an inert perfluoropolyether in a ratio of 8:2, and then mixed with a fluorinated hydrocarbon to a mass concentration of 20% to prepare a surface treatment agent 8; a commercially available spray coating device is used to uniformly spray the surface treatment agent 5 on the chemically strengthened glass at a flow rate of 50 mg / sec and a conveying line speed of 13 mm / sec; before coating, the surface of the chemically strengthened glass is subjected to a plasma treatment; and then the chemically strengthened glass with the spray-treated film is placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0044] The beneficial effects of the present invention are:

[0045] 1. Articles coated with silane compounds containing perfluoropolyether groups have good hydrophobicity, oleophobicity, smoothness, resistance to steel wool abrasion and resistance to eraser abrasion.

[0046] 2. The preparation process of silane compounds containing perfluoropolyether groups has the advantages of reduced synthesis difficulty, simplified process steps, good economy, etc. Its advantages are mainly reflected in: the materials involved in the synthesis are all conventional products on the market and are easy to obtain; some conventional chemical reactions are used in the preparation process, and the reaction temperature is 10-50°C, and the conditions are mild and easy to control; fewer steps are required for product synthesis, the separation and purification steps are simpler, and the production cost is more advantageous. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0048] A silane compound containing a linear perfluoropolyether group, the structural formula of the silane compound containing a linear perfluoropolyether group is: Rf-CH2-OC(O)-X1-CONQ a T 2-a (1), the number average molecular weight is 500-10000.

[0049] In the structural formula of the above-mentioned silane compound containing a linear perfluoropolyether group, a is 0 or 1, X1 is a divalent organic group, and Q is hydrogen, phenyl or C1-22 alkyl.

[0050] X1 is -(R3) g -X2-(R4) h -, wherein R3 and R4 are independently C1-6 alkyl or substituted C1-6 alkyl; g and h are independently 0 or 1.

[0051] X2 is -O-, -S-, -(CH2) k -、-CH=CH-、-O(CH2) k O-, -O(CH2O) k -、-(CF2) k In the group of -, -Rf'-, -Het-, -Ar- or substituted -Ar-, k is independently an integer between 2 and 100 each time it occurs.

[0052] -Het- is a cyclic organic compound containing a heteroatom, -Het- is a cyclic organic compound containing a single heteroatom or a cyclic organic compound containing multiple heteroatoms, and the heteroatom is an oxygen atom, a nitrogen atom or a sulfur atom.

[0053] -Ar- is an aromatic organic compound, -Ar- is o-, m- or p-phenylene, any two positions of which are substituted with an aromatic group containing nitrogen, oxygen or sulfur atoms, or any two positions of which are substituted with a condensed ring aromatic group.

[0054] T is -Y-SiR1 j R2 3-j , wherein Y is a divalent organic group, R1 is an alkoxy group, a hydroxy group or a group that can be hydrolyzed to a hydroxy group, R2 is a C1-22 alkyl group, hydrogen, a phenyl group or a C1-22 alkyl group, j is independently an integer between 0 and 3, and the sum of j is not less than 1.

[0055] Wherein Rf in the structural formula of the above-mentioned silane compound containing a linear perfluoropolyether group is F(CF2) m -(OC4F8) p -(OC3F6) q -(OC2F4) r -(OCF2) s OC(Z)F(CF2) n -.

[0056] Wherein p, q, r and s are independently and are integers between 0 and 200, the sum of p, q, r and s is not less than 1, the order and quantity of each repeating unit with p, q, r and s enclosed in brackets are arbitrary in the formula, m and n are integers between 0 and 30, and Z is F or CF3.

[0057] Rf is CF3-(OC2F4) r -(OCF2) s- OCF 2- (2), wherein the sum of r and s is an integer between 10 and 200. Or Rf is

[0058] F(CF2) m -(OC4F8) p -(OC3F6) q-(OC2F4) r -(OCF2) s OC(Z)F(CF2) n -, wherein m is an integer between 1 and 16, n is an integer between 0 and 2, r and s are independently an integer between 1 and 200, and the sum of p, q, r and s is an integer between 10 and 200.

[0059] A method for preparing a silane compound containing a linear perfluoropolyether group, the preparation method comprising:

[0060] S1. Perfluoropolyether methyl ester is reacted with an amidation reagent in the presence of a catalyst to convert it into perfluoropolyether acid, which is then reacted with an acyl halide reagent to generate the corresponding perfluoropolyether acyl halide, wherein the structural formula of the perfluoropolyether alcohol is: Rf-COOCH3, the structural formula of the perfluoropolyether acid is: Rf-CONH-X1-COOH(4), and the structural formula of the perfluoropolyether acyl halide is: Rf-CONH-X1-COC1.

[0061] S2. Reacting perfluoropolyether acyl halide with aminosilane coupling agent to obtain a silane compound containing a linear perfluoropolyether group, including a film of a surface treatment agent containing a silane compound containing a linear perfluoropolyether group, the structural formula of which is: Rf-CH2-OC(O)-X1-CONQ a T 2-a (1).

[0062] Synthesis example one

[0063] The synthesis of silane compounds containing linear perfluoropolyether groups, the preparation steps are as follows:

[0064] A1. Add 10g of perfluoropolyether modified methyl ester (number average molecular weight 3500-4000) with average composition CF3(OCF2CF2)r(OCF2)sOCF2COOCH3 (sum of r and s is 35-42) into a 100mL single-mouth round-bottom flask equipped with a stirrer, 15ml of 1,3-di(trifluoromethyl)benzene, amidation reagent, and 0.3g of 4-dimethylaminopyridine and stir at room temperature for 2h. After extraction with methanol and water, 9.8g of colorless transparent product was obtained by vacuum distillation, which is the perfluoropolyether carboxylic acid compound: CF3(OCF2CF2)r(OCF2) s OCF2CONHCH2CH2COOH.

[0065] A2. In a 100mL single-mouth round-bottom flask equipped with a dropping funnel and a stirring magnet, add 9.8g of the carboxyl perfluoropolyether compound obtained by A1 and 15ml of 1,3-di(trifluoromethyl)benzene to dissolve it, then add 0.31mL of oxalyl chloride and 0.2ml of DMF dissolved in 5mL of 1,3-di(trifluoromethyl)benzene and slowly drop it in from the dropping funnel. Then heat it to 50°C and stir for 2h. After cooling to room temperature, slowly drop it into a 100mL single-mouth round-bottom flask filled with 5ml of 1,3-di(trifluoromethyl)benzene, 4.2mL of diisopropylethylamine and 4mL of di(3-trimethoxysilylpropyl)amine, and stir at room temperature for 2h. Add 40 ml of perfluorohexane, extract three times with 18 ml of methanol, and distill the volatile components of the fluorine phase under reduced pressure to obtain a colorless to light yellow product, which is the following perfluoropolyether silane compound A with trimethoxysilane at the end: CF3(OCF2CF2) r (OCF2) s OCF2CONHCH2CH2CON[CH2CH2CH2Si(OCH3)3]2.

[0066] Synthesis Example 2

[0067] The synthesis of silane compounds containing linear perfluoropolyether groups, the preparation steps are as follows:

[0068] B1. Add 10g of perfluoropolyether modified methyl ester (number average molecular weight 3500-4000) with an average composition of CF3(OCF2CF2)r(OCF2)sOCF2COOCH3 (the sum of r and s is 35-42) into a 100mL single-mouth round-bottom flask equipped with a stirrer, 15ml of 1,3-di(trifluoromethyl)benzene, an amidation reagent, and 0.3g of 4-dimethylaminopyridine, and stir at room temperature for 2h. After extraction with methanol and water, 9.9g of colorless transparent product was obtained by vacuum distillation, which is a perfluoropolyether carboxylic acid compound: CF3(OCF2CF2)r(OCF2) s OCF2CH2CONHCH2CH2CH2COOH.

[0069] B2. In a 100ml single-mouth round-bottom flask equipped with a dropping funnel and a stirring magnet, add 9.9g of the carboxyl perfluoropolyether compound obtained by B1 and 15ml of 1,3-di(trifluoromethyl)benzene to dissolve it, then add 0.3ml of oxalyl chloride and 0.2ml of DMF dissolved in 5ml of 1,3-di(trifluoromethyl)benzene and slowly drop it in from the dropping funnel. Then heat it to 50℃ and stir for 4h. After cooling to room temperature, slowly drop it into a 100ml single-mouth round-bottom flask equipped with 5ml of 1,3-di(trifluoromethyl)benzene, 4.2ml of diisopropylethylamine and 4.1ml of di(3-trimethoxysilylpropyl)amine, and stir at room temperature for 2h. Add 40 ml of perfluorohexane, extract three times with 18 ml of methanol, and distill the volatile components of the fluorine phase under reduced pressure to obtain a colorless to light yellow product, which is the following perfluoropolyether silane compound B with trimethoxysilane at the end: CF3(OCF2CF2) r (OCF2) s OCF2CH2CONHCH2CH2CH2CON[CH2CH2CH2Si(OCH3)3]2.

[0070] Synthesis Example 3

[0071] The synthesis of silane compounds containing linear perfluoropolyether groups, the preparation steps are as follows:

[0072] C1. Add 10g of perfluoropolyether modified alcohol (number average molecular weight 3500-4000) with average composition CF3(OCF2CF2)r(OCF2)sOCF2CH2OH (sum of r and s is 35-42), 15ml 1,3-di(trifluoromethyl)benzene, 0.555g phthalic anhydride, 0.3g 4-dimethylaminopyridine to a 100mL single-mouth round-bottom flask equipped with a stirrer, and stir at room temperature for 2h. After extraction with methanol and water, vacuum distillation was performed to obtain 10.1g of colorless transparent product, which is a perfluoropolyether carboxylic acid compound: CF3(OCF2CF2)r(OCF2)sOCF2CONHC6H4COOH.

[0073] C2. In a 100ml single-mouth round-bottom flask equipped with a dropping funnel, a thermometer and a stirrer, add 10.1g of the carboxyl perfluoropolyether compound obtained by C1 and 15ml of 1,3-di(trifluoromethyl)benzene to dissolve it, then add 0.3ml of oxalyl chloride and 0.2ml of DMF dissolved in 5ml of 1,3-di(trifluoromethyl)benzene and slowly drop it in from a dropping funnel, then heat to 50°C and stir for 4h, then cool to room temperature and slowly drop it into a 100ml single-mouth round-bottom flask filled with 5ml of 1,3-di(trifluoromethyl)benzene, 4.2ml of diisopropylethylamine and 4ml of di(3-trimethoxysilylpropyl)amine, and stir at room temperature for 5h. Add 40 mL of perfluorohexane, extract three times with 18 ml of methanol, and distill the volatile components of the fluorine phase under reduced pressure to obtain a colorless to light yellow product, which is the following perfluoropolyether silane compound C with trimethoxysilane at the end: CF3(OCF2CF2) r (OCF2) s OCF2CONHC6H4CON[CH2CH2CH2Si(OCH3)3]2.

[0074] The surface treatment agent provided by the present invention contains 0.01-30wt% of the silane compound containing a linear perfluoropolyether group, and the remaining components are solvents and additives; the solvent is one or more of nonafluorobutyl methyl ether, nonafluorobutyl ethyl ether, tridecafluorohexyl methyl ether, hydrofluoroether, fluorocarbon compounds, and meta-ditrifluorotoluene, and the additive is one or more of perfluoropolyethers, organic acids, and organic bases.

[0075] The present invention provides a method for preparing a film of a surface treatment agent containing a linear perfluoropolyether-based silane compound, and the preparation method comprises a wet coating method:

[0076] Step 1: dilute the surface treatment agent to a dilution solution with a solid content concentration of 0.1wt%-0.4wt%.

[0077] Step 2: coating or spraying on the plasma-treated substrate and baking, and obtaining a thin film after cooling, wherein the baking temperature is 80-150° C., the baking time is 10-60 minutes, and the final cooling temperature is room temperature.

[0078] Also includes vapor deposition methods:

[0079] Step 1: Prepare the surface treatment agent into pills.

[0080] Step 2: Use an evaporator to load it onto a substrate on which silicon dioxide has been deposited to form a uniform surface coating to obtain a thin film.

[0081] Embodiment 1

[0082] The perfluoropolyether-based silane compound A synthesized in Synthesis Example 1 and hydrofluoroether were prepared into a concentration of 20% by mass to serve as a surface treatment agent 1. The surface treatment agent 1 was evaporated onto the chemically strengthened glass by vapor deposition. Under a vacuum pressure of less than 4×10-3Pa, silicon dioxide was first deposited onto the chemically strengthened glass by electron beam deposition to form a silicon dioxide film with a thickness of 10nm. Then, the surface treatment agent 1 was deposited on each piece of chemically strengthened glass by vacuum deposition to a thickness of about 8-10nm. The chemically strengthened glass with the deposited film was then placed in an environment of 60% humidity and 70°C for 2 hours for curing to form a surface treatment layer.

[0083] Embodiment 2

[0084] The perfluoropolyether-based silane compound A synthesized in Synthesis Example 1 was mixed with an inert perfluoropolyether in a ratio of 8:2, and then adjusted to a mass concentration of 20% with hydrofluoroether to serve as a surface treatment agent 2; the surface treatment agent 2 was evaporated onto the chemically strengthened glass by vapor deposition, and silicon dioxide was first deposited on the chemically strengthened glass with a thickness of 10 nm by electron beam deposition under a vacuum pressure of less than 4×10-3 Pa to form a silicon dioxide film, and then the surface treatment agent 2 was deposited on each piece of chemically strengthened glass by vacuum deposition to a thickness of about 8-10 nm; and then the chemically strengthened glass with the deposited film was placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0085] Embodiment 3

[0086] The perfluoropolyether-based silane compound B synthesized in Synthesis Example 2 was mixed with an inert perfluoropolyether in a ratio of 8:2, and then adjusted to a mass concentration of 20% with hydrofluoroether to serve as a surface treatment agent 3; the surface treatment agent 3 was evaporated onto the chemically strengthened glass by vapor deposition, and silicon dioxide was first deposited on the chemically strengthened glass by electron beam deposition at a vacuum pressure of less than 4x10-3Pa to form a silicon dioxide film with a thickness of 10nm, and then the surface treatment agent 3 was deposited on each piece of chemically strengthened glass by vacuum deposition to a thickness of about 8-10nm; and then the chemically strengthened glass with the deposited film was placed in an environment of 60% humidity and 70°C for 2 hours for curing to form a surface treatment layer.

[0087] Embodiment 4

[0088] The perfluoropolyether-based silane compound C synthesized in Synthesis Example 3 was mixed with an inert perfluoropolyether in a ratio of 8:2, and then adjusted to a mass concentration of 20% with hydrofluoroether to serve as a surface treatment agent 4; the surface treatment agent 4 was evaporated onto the chemically strengthened glass by vapor deposition, and silicon dioxide was first deposited on the chemically strengthened glass with a thickness of 10 nm by electron beam deposition under a vacuum pressure of less than 4×10-3 Pa to form a silicon dioxide film, and then the surface treatment agent 4 was deposited on each piece of chemically strengthened glass by vacuum deposition to a thickness of about 8-10 nm; and then the chemically strengthened glass with the deposited film was placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0089] Embodiment 5

[0090] The perfluoropolyether-based silane compound A synthesized in Synthesis Example 1 was mixed with a fluorinated hydrocarbon to a concentration of 20% by mass to prepare a surface treatment agent 5. A commercially available spray coating device was used to uniformly spray the surface treatment agent 5 on the chemically strengthened glass at a flow rate of 50 mg / sec and a conveying line speed of 13 mm / sec. Before coating, the surface of the chemically strengthened glass was subjected to plasma treatment. The chemically strengthened glass with the spray-treated film was then placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0091] Embodiment 6

[0092] The perfluoropolyether-based silane compound A synthesized in Synthesis Example 1 was mixed with an inert perfluoropolyether in a ratio of 8:2, and then adjusted with a fluorinated hydrocarbon to a mass concentration of 20% to prepare a surface treatment agent 6; a commercially available spray coating device was used to uniformly spray the surface treatment agent 5 on the chemically strengthened glass at a flow rate of 50 mg / sec and a conveying line speed of 13 mm / sec; before coating, the surface of the chemically strengthened glass was subjected to plasma treatment; and then the chemically strengthened glass with the spray-treated film was placed in an environment of 60% humidity and 70°C for 2 hours for curing to form a surface treatment layer.

[0093] Embodiment 7

[0094] The perfluoropolyether-based silane compound B synthesized in Synthesis Example 2 was mixed with an inert perfluoropolyether in a ratio of 8:2, and then adjusted with a fluorinated hydrocarbon to a mass concentration of 20% to prepare a surface treatment agent 7; a commercially available spray coating device was used to uniformly spray the surface treatment agent 5 on the chemically strengthened glass at a flow rate of 50 mg / sec and a conveying line speed of 13 mm / sec; before coating, the surface of the chemically strengthened glass was subjected to plasma treatment; and then the chemically strengthened glass with the spray-treated film was placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0095] Embodiment 8

[0096] The perfluoropolyether-based silane compound C synthesized in Synthesis Example 3 was mixed with an inert perfluoropolyether in a ratio of 8:2, and then adjusted with a fluorinated hydrocarbon to a mass concentration of 20% to prepare a surface treatment agent 8; a commercially available spray coating device was used to uniformly spray the surface treatment agent 5 on the chemically strengthened glass at a flow rate of 50 mg / sec and a conveying line speed of 13 mm / sec; before coating, the surface of the chemically strengthened glass was subjected to plasma treatment; and then the chemically strengthened glass with the spray-treated film was placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0097] Comparative Example 1

[0098] A treatment agent of model OPTOOL UD509 is used as a surface treatment agent (1) prepared with hydrofluoroether to a concentration of 20%. This treatment agent is a prior art: produced by Daikin Industries, Ltd. OPTOOL UD509 is a nano coating composed of a fluorine group and a silicon group. The surface treatment agent (1) is evaporated onto a chemically strengthened glass by a vapor deposition method. Under a vacuum pressure of less than 4×10-3 Pa, silicon dioxide is first deposited onto the chemically strengthened glass by an electron beam deposition method to form a silicon dioxide film with a thickness of 10 nm. Then, the surface treatment agent (1) is deposited on each piece of chemically strengthened glass by a vacuum deposition method to a thickness of about 8-10 nm. The chemically strengthened glass with the deposited film is then placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0099] Comparative Example 2

[0100] A treatment agent of model 2120X is used as a surface treatment agent (2) prepared with hydrofluoroether to a concentration of 20% by mass. This treatment agent is a prior art product produced by Asahi Glass Co., Ltd. The main component of 2120X includes a combination of a fluorine-modified organic group and an active silane group. The surface treatment agent (2) is evaporated onto the chemically strengthened glass by a vapor deposition method. Under a vacuum pressure of less than 4×10-3 Pa, silicon dioxide is first deposited onto the chemically strengthened glass by an electron beam deposition method to form a silicon dioxide film with a thickness of 10 nm. Then, the surface treatment agent (2) is deposited on each piece of chemically strengthened glass by vacuum deposition to a thickness of about 8-10 nm. The chemically strengthened glass with the deposited film is then placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0101] Comparative Example 3

[0102] A treatment agent of model X-71-197 is used as a surface treatment agent (3) prepared with hydrofluoroether to a mass concentration of 20%. This treatment agent is a prior art: Shin-Etsu Chemical Co., Ltd. X-71-197 is a coating containing active silane groups and organic fluorine groups; the surface treatment agent (3) is evaporated onto the chemically strengthened glass by vapor deposition, and at a vacuum pressure of less than 4×10-3 Pa, silicon dioxide is first deposited on the chemically strengthened glass by electron beam deposition to form a silicon dioxide film with a thickness of 10 nm, and then the surface treatment agent (3) is deposited on each piece of chemically strengthened glass by vacuum deposition to a thickness of about 8-10 nm; and then the chemically strengthened glass with the deposited film is placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0103] Comparative Example 4

[0104] A treatment agent of model OPTOOL UD509 is prepared by mixing a fluorinated hydrocarbon with a mass concentration of 20% to prepare a surface treatment agent (4); a commercially available spray coating device is used to uniformly spray the surface treatment agent (4) on the chemically strengthened glass at a flow rate of 50 mg / sec and a conveying line speed of 13 mm / sec; before coating, the surface of the chemically strengthened glass is subjected to plasma treatment; and then the chemically strengthened glass with the sprayed treatment film is placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0105] Comparative Example 5

[0106] A treatment agent of model 2120X is prepared by mixing a fluorinated hydrocarbon with a mass concentration of 20% to prepare a surface treatment agent (5); a commercially available spray coating device is used to uniformly spray the surface treatment agent (5) on the chemically strengthened glass at a flow rate of 50 mg / sec and a conveying line speed of 13 mm / sec; before coating, the surface of the chemically strengthened glass is subjected to plasma treatment; and then the chemically strengthened glass with the sprayed treatment film is placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0107] Comparative Example 6

[0108] A treatment agent of model X-71-197 is prepared by mixing a fluorinated hydrocarbon with a mass concentration of 20% to prepare a surface treatment agent (6); a commercially available spray coating device is used to uniformly spray the surface treatment agent (6) on the chemically strengthened glass at a flow rate of 50 mg / sec and a conveying line speed of 13 mm / sec; before coating, the surface of the chemically strengthened glass is subjected to a plasma treatment; and then the chemically strengthened glass with the sprayed treatment film is placed in an environment of 60% humidity and 70° C. for 2 hours for curing to form a surface treatment layer.

[0109] The surface treatment layers of the comparative example and the first and fifth embodiments were subjected to hydrophobicity and oleophobicity tests, slipperiness tests, and abrasion resistance tests.

[0110] The contact angle of the surface treatment layer to water and the contact angle of n-hexadecane were measured using a contact angle meter model SDC-100. The measurement uncertainty was ±1.3°.

[0111] The smoothness of the surface treatment layer was measured using a friction coefficient meter with a contact area of ​​20 mm x 20 mm, a load of 200 g, a linear speed of 200 mm / min, and a stroke of 35 mm.

[0112] Table 1 Hydrophobicity, oleophobicity and slipperiness test

[0113] Hydrophobicity(°) Oleophobicity(°) Dynamic friction coefficient Test Example 1 114 70 0.025 Test Example 2 116 71 0.020 Test Example 3 116 71 0.019 Test Example 4 117 72 0.021 Comparative Example 1 117 71 0.015 Comparative Example 2 116 69 0.019 Comparative Example 3 117 71 0.021

[0114] Use a friction tester to drive a wear-resistant test rubber strip of model MB006004 and size 6mm to pass back and forth on the surface treatment layer 1000 times, with a load of 1kg, a moving stroke of 40mm, and a moving speed of 40rpm. Then measure the water contact angle, and stop the evaluation when the water contact angle is less than 100 degrees.

[0115] Table 2 Eraser wear resistance

[0116]

[0117] Use a friction tester to drive BONSTAR#0000 steel wool to pass back and forth on the surface treatment layer 3000 times, with a load of 1kg / cm 2 , the moving stroke is 40mm, and the moving speed is 60rpm. Then the water contact angle is measured, and the evaluation is terminated when the water contact angle is less than 100 degrees or 20,000 frictions or the steel wool is damaged.

[0118] Table 3 Steel wool abrasion resistance

[0119]

[0120] It can be seen from Table 1, Table 2 and Table 3 that the surface treatment agent prepared by using the perfluoropolyether compound of the present invention enables the glass substrate treated therewith to have excellent anti-fouling, anti-fingerprint, scratch resistance and wear resistance, and its comprehensive performance is better than that of commercially available products. In addition, the preparation method of the compound of the present invention is simple in process and easy to operate and implement.

[0121] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A silane compound containing a linear perfluoropolyether group, characterized in that: The structural formula of the silane compound containing a linear perfluoropolyether group is: Rf-CH2-OC(O)-X1-CONQ a T 2-a (1) Number average molecular weight is 500-10000; Wherein a in the structural formula of the above-mentioned silane compound containing a linear perfluoropolyether group is 0 or 1, X1 is a divalent organic group, and Q is hydrogen, phenyl or C1-22 alkyl; Wherein Rf in the structural formula of the above-mentioned silane compound containing a linear perfluoropolyether group is F(CF2) m -(OC4F8) p -(OC3F6) q -(OC2F4) r -(OCF2) s OC(Z)F(CF2) n -; Wherein p, q, r and s are independently and are integers between 0 and 200, the sum of p, q, r and s is not less than 1, the order and quantity of each repeating unit with p, q, r and s enclosed in brackets are arbitrary in the formula, m and n are integers between 0 and 30, and Z is F or CF3.

2. A silane compound containing a linear perfluoropolyether group according to claim 1, characterized in that: The T is -Y-SiR1 j R2 3-j , wherein Y is a divalent organic group, R1 is an alkoxy group, a hydroxy group or a group that can be hydrolyzed to a hydroxy group, R2 is a C1-22 alkyl group, hydrogen, a phenyl group or a C1-22 alkyl group, j is independently an integer between 0 and 3, and the sum of j is not less than 1.

3. A silane compound containing a linear perfluoropolyether group according to claim 1, characterized in that: The Rf is CF3-(OC2F4) r -(OCF2) s- OCF 2- (2), wherein the sum of r and s is an integer between 10 and 200; or Rf is F(CF2) m -(OC4F8) p -(OC3F6) q -(OC2F4) r -(OCF2) s OC(Z)F(CF2) n -, wherein m is an integer between 1 and 16, n is an integer between 0 and 2, r and s are independently an integer between 1 and 200, and the sum of p, q, r and s is an integer between 10 and 200.

4. A silane compound containing a linear perfluoropolyether group according to claim 1 or 3, characterized in that: The X1 is -(R3) g -X2-(R4) h -, wherein R3 and R4 are independently C1-6 alkyl or substituted C1-6 alkyl; g and h are independently 0 or 1; X2 is -O-, -S-, -(CH2) k -、-CH=CH-、-O(CH2) k O-, -O(CH2O) k -、-(CF2) k -, -Rf'-, -Het-, -Ar- or substituted -Ar-, k is independently an integer between 2 and 100 each time it appears; the -Het- is a cyclic organic compound containing a heteroatom; the -Ar- is an organic compound with aromaticity.

5. A silane compound containing a linear perfluoropolyether group according to claim 4, characterized in that: The -Rf'- is -(CF2) u -(OC4F8) v -(OC3F6) w -(OC2F4) x -(OCF2) y -OC(Z)F-(CF2) f -, wherein u is an integer between 1 and 16, f is an integer between 0 and 2, x and y are independently an integer between 1 and 200, the sum of v, w, x and y is an integer between 10 and 200, the order and quantity of each repeating unit enclosed in brackets with v, w, x and y in the formula are arbitrary, and Z is F or CF3.

6. A silane compound containing a linear perfluoropolyether group according to claim 4, characterized in that: The -Het- is a ring containing a single heteroatom or a ring organic compound containing multiple heteroatoms, the heteroatom is an oxygen atom, a nitrogen atom or a sulfur atom; the -Ar- is o-, m- or p-phenylene, any two positions of which are substituted with nitrogen, oxygen or sulfur atom-containing aromatic groups, or any two positions of which are substituted with condensed ring aromatic groups.

7. A method for preparing a silane compound containing a linear perfluoropolyether group according to any one of claims 1 to 6, wherein the preparation method comprises: S1, converting perfluoropolyether methyl ester into perfluoropolyether acid by reacting with an amidating agent in the presence of a catalyst, and then reacting with an acyl halide agent to generate a corresponding perfluoropolyether acyl halide, wherein the structural formula of the perfluoropolyether alcohol is: Rf-COOCH3, the structural formula of the perfluoropolyether acid is: Rf-CONH-X1-COOH(4), and the structural formula of the perfluoropolyether acyl halide is: Rf-CONH-X1-COC1; S2. Reacting perfluoropolyether acyl halide with aminosilane coupling agent to obtain a silane compound containing a linear perfluoropolyether group, including a film of a surface treatment agent containing a silane compound containing a linear perfluoropolyether group, the structural formula of which is: Rf-CH2-OC(O)-X1-CONQ a T 2-a (1).

8. The surface treatment agent of a silane compound containing a linear perfluoropolyether group according to claim 7, characterized in that: The surface treatment agent contains 0.01-30wt% of the silane compound containing a linear perfluoropolyether group, and the remaining components are solvents and additives; the solvent is one or more of nonafluorobutyl methyl ether, nonafluorobutyl ethyl ether, tridecafluorohexyl methyl ether, hydrofluoroether, fluorocarbon compounds, and meta-ditrifluorotoluene, and the additive is one or more of perfluoropolyethers, organic acids, and organic bases.

9. A method for preparing a film of a surface treatment agent containing a linear perfluoropolyether-based silane compound according to claim 7-8, the preparation method comprising a wet coating method: Step 1, diluting the surface treatment agent to a solid content concentration of 0.1wt%-0.4wt%; Step 2: coating or spraying on the plasma-treated substrate and baking, and obtaining a thin film after cooling, wherein the baking temperature is 80-150° C., the baking time is 10-60 minutes, and the final cooling temperature is room temperature.

10. A method for preparing a film of a surface treatment agent containing a linear perfluoropolyether-based silane compound according to claims 7-8, wherein the preparation method further comprises a vapor deposition method: Step 1, preparing the surface treatment agent into pills; Step 2: Use an evaporator to load it onto a substrate on which silicon dioxide has been deposited to form a uniform surface coating to obtain a thin film.

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