Super-hydrophilic coating material based on sulfonyl modified silane and preparation method of super-hydrophilic coating material

Abstract

The invention discloses a super-hydrophilic coating material based on sulfo-modified silane and a preparation method thereof. The preparation method comprises the following steps: reacting sultone with nitrogen-containing silane to prepare a super-hydrophilic monomolecular layer material; the long-acting hydrophilic coating which is environment-friendly, ultrathin in film layer and covalently bonded with the high-silicon substrate is developed, and is suitable for antifogging and self-cleaning treatment of substrates such as glass and surface high-silicon plastic; the formation of the super-hydrophilic film can only depend on hard connection adhesion formed by condensation of silane coupling agent silicon hydroxyl and substrate silicon hydroxyl; reaction point locations on the surface of the substrate are limited, so that some redundant silane coupling agents are only stacked together, the sulfonic compound is extremely easy to dissolve in water, redundant materials can be removed through washing, and finally a layer of functional monomolecular film is left; the method has the advantages of mild reaction conditions, environmental protection, ultrathin film layer, simple construction and the like, and is suitable for anti-fog or anti-pollution treatment in the fields of optical glass, medical equipment and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of surface modification, and more particularly to a super-hydrophilic coating material based on sulfonic acid group-modified silane and a preparation method thereof. Background Art

[0002] The composition of hydrophilic coatings is inseparable from several key components: first, polymers, as the core component, can ensure the uniform distribution of the coating and significantly improve the hydrophilicity of the surface of the object; second, cross-linkers, this material is responsible for building a three-dimensional network of the coating, thereby enhancing the hardness and durability of the coating; in addition, fillers are also widely added to improve the consistency and hardness of the coating, making it more durable; the synergistic effect of these components gives hydrophilic coatings excellent wetting properties, wear resistance and chemical corrosion resistance, making it very useful in surface coatings of various materials such as glass, metal, and plastic.

[0003] The defects of existing technologies are as follows: pollution problem: traditional hydrophilic coatings use fluorinated solvents or heavy metal catalysts, which are not environmentally friendly; the film layer is too thick: the physical coating method results in a film thickness of >200nm and a transmittance drop of >5%; substrate limitations: high-silicon plastics on the surface (usually silicone resin coatings are used to harden the plastic surface, and its SiO2 content is >25%wt) have low surface energy, and conventional silanes are difficult to bond stably. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a super-hydrophilic coating material based on sulfonic acid-modified silane and a preparation method thereof.

[0005] A super-hydrophilic coating material based on sulfonic acid group-modified silane is obtained by coating a hydrophilic modifier on the surface of a substrate, baking and curing the substrate, and then washing the substrate with water.

[0006] Furthermore, the substrate is a substrate containing silicon dioxide or a substrate having a silicon dioxide content greater than 25% in the surface layer.

[0007] Furthermore, the substrate includes glass, any substrate with silicon dioxide plated on the surface, and a plastic substrate with a surface coated with a resin containing silicon dioxide.

[0008] Furthermore, the hydrophilic modifier includes 0.5% WT to 10% WT of modified silane, 0.01% WT to 5% WT of spreading agent, 0.05% WT to 2% WT of pH buffer, and the rest is hydrolysis solution.

[0009] Furthermore, the raw materials of the modified silane include sultone and silane containing a nucleophilic nitrogen atom.

[0010] Furthermore, the sultone is one or a combination of propane sultone and butane sultone, the silane containing a nucleophilic nitrogen atom is a silane containing a primary amine / secondary amine / pyridyl group, and the molar ratio of the sultone to the silane containing a primary amine / secondary amine / pyridyl group is 1:0.3 to 1:1.5.

[0011] Furthermore, the hydrolysis solution is an alcohol-water composite solution, the volume ratio of alcohol to deionized water in the alcohol-water composite solution is 1:0.5 to 1:20, the alcohol includes one or more of ethanol, methanol, isopropanol, and n-butanol, the pH of the hydrolysis solution is 3 to 6, and the pH value is adjusted by acetic acid, toluenesulfonic acid, dilute hydrochloric acid, citric acid, etc.

[0012] Furthermore, the spreading agent is a combination of one or more of polyether-modified silicone, Shin-Etsu KF-6011, BYK-345, and TEGO Glide435; and the pH buffer is an organic sulfonic acid buffer, such as a combination of one or more of 4-hydroxyethylpiperazineethanesulfonic acid, propanesulfonic acid pyridinium salt, and hydroxypropanesulfonic acid pyridinium salt.

[0013] A method for preparing a super-hydrophilic coating material based on sulfonic acid modified silane, the specific preparation steps are as follows: Step 1: adding propane sultone or butane sultone and a silane containing a primary amine / secondary amine / pyridyl group into a reactor for a ring-opening reaction to obtain a modified silane; Step 2: preparing a hydrolysis solution, adding the hydrolysis solution to the modified silane, stirring at a constant temperature until dissolved, adding a spreading agent and a pH buffer, and stirring at a constant temperature for 0.5 to 24 hours to obtain a hydrophilic modifier; Step 3: performing surface activation treatment on the substrate to obtain a pretreated substrate; Step 4: evenly coating the hydrophilic modifier on the pretreated substrate surface, performing a baking and curing treatment to form a coating on the substrate surface; Step 5: Wash the surface of the substrate with deionized water or wipe the surface of the substrate with a wet cloth to obtain a super-hydrophilic coating material based on sulfonic acid modified silane on the surface of the substrate.

[0014] Furthermore, in step 1, the reaction conditions are: inert gas protection, reaction at room temperature to 120°C for 1 to 12 hours, the reactant is cooled, filtered, and purified by solvent washing to obtain modified silane; in step 2, the constant temperature is: room temperature to 80°C; in step 3, plasma activation treatment is performed on the surface of the substrate, and the plasma treatment conditions are: using O2 / argon mixed gas, power of 50 to 1000W, time of 30 to 300s, and generating Si-OH density ≥3 / nm 2 In step 4, the curing conditions are: baking at 60-150°C for 0.5-24 hours.

[0015] Technical effects and advantages of the present invention: 1. The super-hydrophilic coating material based on sulfonic acid-modified silane prepared by the present invention is prepared by reacting sultone with nitrogen-containing silane to form a super-hydrophilic monolayer material. The present invention develops an environmentally friendly, ultra-thin film that is covalently bonded to a high-silicon substrate and is suitable for anti-fog and self-cleaning treatment of substrates such as glass and high-silicon plastics. The basic principle of the present invention is to chemically modify the surface of the substrate. Because the modifier does not contain any film-forming substances, the formation of the super-hydrophilic film can only rely on the hard connection formed by the condensation of the silanol groups of the silane coupling agent and the silanol groups of the substrate. Because the reaction sites on the substrate surface are limited, some excess silane coupling agents will simply stack together. Even if these silane coupling agents self-polymerize, they cannot form a strong connection with the base film layer (the silane coupling agent layer that reacts and connects to the substrate). Moreover, sulfonic acid compounds are highly soluble in water, so the excess material can be removed by washing with water or wiping with a wet cloth, ultimately leaving a functional monolayer. 2. The present invention uses a sultone to react with a silane coupling agent containing a nucleophilic nitrogen atom to prepare a silane coupling agent having a super-hydrophilic group through a ring-opening reaction of the lactone; the sulfonic acid group is super-hydrophilic, and the siloxane becomes reactive after hydrolysis, capable of modifying a substrate containing silanol groups; the product after the synthesis reaction is cooled, stored cold, and filtered to obtain a solid; and then washed with a solvent to obtain a purified solid product; the synthesized product of the present invention is prepared into a liquid preparation after hydrolysis, which contains some functional additives but does not contain any film-forming material; the functions of the functional additives are mainly to increase the storage stability of the liquid, spreadability on the surface after coating, and promote the spontaneous arrangement of the super-hydrophilic silane coupling agent with the super-hydrophilic groups facing outward and the silanol groups facing inward, thereby promoting silanol condensation; substrate surface activation and coating: the silicon-containing substrate is subjected to plasma treatment or chemical oxidation to activate the silanol groups on the substrate surface, and the substrate is coated with a modifier and then baked to condense the silanol groups to form a monomolecular film. DETAILED DESCRIPTION

[0016] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0017] Example 1 A method for preparing a super-hydrophilic coating material based on sulfonic acid modified silane, the specific steps are as follows: Step 1: Synthesis of modified silane n-Hexane was used as the solvent, propane sultone and aminopropyltriethoxysilane were added to the reactor in a molar ratio of 1:1.2, and the volume ratio of the solvent to the reactants was 3:1. Under nitrogen protection, the reaction was carried out at 80°C for 5 hours. After the reaction, the mixture was cooled to room temperature, filtered and washed three times with ethanol to obtain a white solid modified silane.

[0018] Step 2: Preparation of hydrophilic modifier Prepare a hydrolysis solution: mix isopropanol and deionized water in a volume ratio of 1:3, and adjust the pH to 5 with citric acid; add the modified silane (2% WT) prepared in step 1, a spreading agent BYK-345 (0.1% WT), and a pH buffer agent propanesulfonic acid pyridinium salt (0.2% WT) to the hydrolysis solution in sequence, and stir at a constant temperature of 60°C for 4 hours to obtain a uniform and transparent hydrophilic modifier.

[0019] Step 3: Substrate surface activation treatment A plastic substrate coated with silicon dioxide was selected and plasma treated with an O2 / Ar mixed gas under the following conditions: power 100W, time 150s. After treatment, the Si-OH density on the substrate surface was ≥4 / nm².

[0020] Step 4: Coating and curing The hydrophilic modifier is evenly coated on the surface of the activated substrate by spraying, and is placed in an oven and baked at 100° C. for 2 hours to fully condense the silanol groups.

[0021] Step 5: Water washing and purification The substrate surface is rinsed with deionized water to remove unbonded silane coupling agent, and finally a superhydrophilic monomolecular film is formed on the substrate surface.

[0022] Performance Testing Contact angle: The water contact angle measured by contact angle meter is less than 5°; Light transmittance: Spectrophotometer test shows that the light transmittance loss is only 0.8%; Durability: After 2000 friction tests (using a friction tester: the friction head is wrapped with a dust-free cloth moistened with deionized water, the friction contact area is approximately 1 square centimeter, a 500-gram weight load, a stroke of 3 cm back and forth is counted as one time, and the speed is 60 times per minute), the coating has no obvious shedding; Application scenarios: Suitable for anti-fouling treatment of medical device surfaces.

[0023] Example 2 A method for preparing a super-hydrophilic coating material based on sulfonic acid modified silane, the specific steps are as follows: Step 1: Synthesis of modified silane Using acetonitrile as solvent, propane sultone and 2-(2-pyridyl)ethyltrimethoxysilane were mixed in a molar ratio of 1:1. Under nitrogen protection, the mixture was heated to boiling and refluxed for 8 hours. The reaction product was cooled, filtered, and washed with n-butanol for purification to obtain a light yellow modified silane.

[0024] Step 2: Preparation of hydrophilic modifier Prepare a hydrolysis solution: mix ethanol and deionized water in a volume ratio of 1:10, adjust the pH to 4 with toluenesulfonic acid; add modified silane (2% WT), spreading agent TEGO Glide 435 (0.1% WT), and pH buffer 4-hydroxyethylpiperazineethanesulfonic acid (0.2% WT), and stir at a constant temperature of 40°C for 12 hours to prepare a hydrophilic modifier.

[0025] Step 3: Substrate surface activation treatment Ultra-white glass was ultrasonically cleaned in an optical glass cleaner for 5 minutes, and after rinsing the surface cleaner with deionized water, it was dried at low temperature. Plasma treatment was performed using an O2 / Ar mixed gas under the following conditions: power 100W, time 150s, and the Si-OH density on the substrate surface after treatment was ≥4 / nm².

[0026] Step 4: Coating and curing The hydrophilic modifier was evenly coated on the surface of the substrate by dip coating and baked at 80° C. for 1 hour to promote the silanol condensation reaction.

[0027] Step 5: Water washing and purification The substrate was rinsed with deionized water to remove the unreacted silane coupling agent and obtain a superhydrophilic coating.

[0028] Performance Testing Contact angle: Water contact angle <3°, reaching super hydrophilic standard; Film thickness: The film thickness was measured by a refractometer and was about 50 nm; Chemical resistance: After 500 alcohol wipes (tested using a friction tester: the friction head is wrapped with a dust-free cloth moistened with anhydrous ethanol, the friction contact area is approximately 1 square centimeter, a 500-gram weight load, a stroke of 3 cm back and forth is counted as one, and the speed is 60 times per minute), the coating remains intact; Application scenario: Suitable for anti-fouling treatment of outdoor display screen surfaces.

[0029] Comparative Example 1 (traditional silane coupling agent) Step 1: Preparation of hydrophilic modifier Non-ionic surfactant polyether-modified silane (CAS No.: 67674-67-3) was directly used to prepare a hydrolysis solution (ethanol / water volume ratio 1:1, pH = 4).

[0030] Step 2: Coating preparation The hydrolyzed solution was coated on a plasma-activated glass substrate (activation conditions were the same as in Example 1) and baked at 100° C. for 3 hours.

[0031] Test results Contact angle: >10°, significantly insufficient hydrophilicity; Adhesion: After washing, the coating falls off over a large area; Transmittance loss: 1.5%, optical performance is significantly reduced.

[0032] Comparative Example 2 (addition of film-forming resin) Step 1: Preparation of hydrophilic modifier Aqueous hydroxylated acrylic dispersion (Bayhydrol XP 2701, Covestro) was diluted with deionized water to a concentration of 10%.

[0033] The aqueous hydroxy acrylic acid dispersion dilution was added dropwise to the hydrophilic modifier of Example 1; the mass ratio of the hydrophilic modifier to the aqueous hydroxy acrylic acid dispersion dilution was 8:1; after the addition, the mixture was magnetically stirred (500 rpm, 30° C.) for 2 hours.

[0034] Step 2: Coating preparation The coating and curing conditions were the same as in Example 1.

[0035] Test results Film thickness: >150nm, transmittance loss reaches 4.2%; Contact angle fluctuation: 5°~10°, unstable hydrophilicity; Water washing residue: Part of the film-forming resin remains on the surface of the substrate.

[0036] The sources of raw materials in the examples and comparative examples are as follows: n-hexane was purchased from Sinopharm Chemical Reagent Co., Ltd., with a national medicine code of 80068618; acetonitrile was purchased from Sinopharm Chemical Reagent Co., Ltd., with a national medicine code of 400641646; propane sultone was purchased from 1,3-propane sultone of Wuhan Rongcan Biotechnology Co., Ltd.; aminopropyltriethoxysilane was purchased from Sinopharm Chemical Reagent Co., Ltd., with a national medicine code of XW0191930206; 2-(2-pyridyl)ethyltrimethoxysilane was purchased from Shanghai Yuanye Biotechnology Co., Ltd., with a product number of T22623; n-butanol was purchased from Sinopharm Chemical Reagent Co., Ltd., Sinopharm code: 10005208; anhydrous ethanol was purchased from Sinopharm Chemical Reagent Co., Ltd., Sinopharm code: 10009218; isopropyl alcohol was purchased from Sinopharm Chemical Reagent Co., Ltd., Sinopharm code: 80109218; citric acid was purchased from Sinopharm Chemical Reagent Co., Ltd., Sinopharm code: 10007117; toluenesulfonic acid was purchased from Sinopharm Chemical Reagent Co., Ltd., Sinopharm code: XW01619252501; spreading agent BYK-345 was purchased from Dongguan Hongrui Chemical Co., Ltd., model: BYK345; spreading agent TEGO Glide 435 was purchased from Guangzhou Haoquan Chemical Technology Co., Ltd., model: TEGO Glide435; pH buffer propanesulfonic acid pyridinium salt was purchased from Shanghai Yuanye Biotechnology Co., Ltd., item number: S62068; pH buffer 4-hydroxyethylpiperazineethanesulfonic acid was purchased from Hubei Xindesheng Material Technology Co., Ltd., item number: DS, brand: Desheng.

[0037] in conclusion Examples 1-2 further demonstrate the applicability of the present invention to various substrates and process conditions by adjusting the sultone and silane types. The resulting superhydrophilicity, light transmittance, and durability significantly outperform conventional technologies. Comparative Examples 1-2 demonstrate that sulfonic acid group modification, plasma activation, and the absence of film-forming agents are key elements in achieving the present invention's ultrathin, highly adhesive, and environmentally friendly coatings.

[0038] The comparison between the present invention and existing patents is shown in Table 1: As can be seen from the table above, the present invention's super-hydrophilic coating material based on sulfonic acid-modified silane is prepared by reacting sultone with nitrogen-containing silane to form a super-hydrophilic monolayer material. The present invention has developed an environmentally friendly, ultra-thin, long-lasting hydrophilic coating that is covalently bonded to a high-silicon substrate and is suitable for anti-fog and self-cleaning treatment of substrates such as glass and high-silicon plastics. The present invention realizes super-hydrophilic surface construction through the following steps: Synthesis of sulfonic acid grafted modified silane: Propane sultone or butane sultone reacts with a silane containing a nucleophilic nitrogen atom (such as aminopropyltriethoxysilane). The sultone is ring-opened to generate a modified silane (a silane coupling agent containing a sulfonic acid group). Preparation of hydrophilic modifier: hydrolyze the modified silane in an alcohol-water system, add a stabilizer and a spreading aid to form a storage-stable hydrophilic modifier; Substrate surface activation and coating: Plasma treatment or chemical oxidation is performed on silicon-containing substrates (such as glass, substrates coated with silicon dioxide, and plastic substrates containing silicon) to activate the surface silanol groups. After coating with a modifier and baking, the silanol groups condense to form a monomolecular film. Water washing and purification: Taking advantage of the good water solubility of sulfonic acid groups, water is used to remove unbonded coupling agents and retain the super-hydrophilic monolayer membrane; The present invention has the advantages of mild reaction conditions (yield ≥ 95%), environmental protection (water / alcohol solvent), ultra-thin film layer (transmittance loss < 1%), simple construction, etc., and is suitable for anti-fog or anti-fouling treatment in the fields of optical glass, medical equipment, etc. The present invention adopts a reaction between sultone and a silane coupling agent containing a nucleophilic nitrogen atom to prepare a silane coupling agent having a super-hydrophilic group through a ring-opening reaction of the lactone; the sulfonic acid group has super-hydrophilicity, and the siloxane has reaction activity after hydrolysis, and can modify a substrate containing a silanol group; the product after the synthesis reaction is cooled, stored in cold, and filtered to obtain a solid; and then washed with a solvent to obtain a purified solid product; The synthetic product of the present invention is hydrolyzed to prepare a liquid preparation, which contains some functional additives but does not contain any film-forming substances. The functions of the functional additives are mainly to increase the storage stability of the liquid, spreadability on the surface after coating, promote the spontaneous arrangement of the super-hydrophilic silane coupling agent with the super-hydrophilic groups facing outward and the silanol groups facing inward, and promote the condensation of the silanol groups. The basic principle of the present invention is to chemically modify the surface of the substrate. Since the modifier does not contain any film-forming substances, the formation of the super-hydrophilic film can only rely on the hard connection formed by the condensation of the silanol groups of the silane coupling agent and the substrate. Because the reaction sites on the substrate surface are limited, some excess silane coupling agents will simply stack together. Even if these silane coupling agents self-polymerize, they cannot form a strong connection with the base film layer (the silane coupling agent layer that reacts and connects with the substrate). In addition, sulfonic acid compounds are highly soluble in water, so the excess material can be removed by washing with water or wiping with a wet cloth, ultimately leaving a functional monomolecular film. Therefore, when preparing the film layer, this technology is independent of the coating method. The dry film can be thicker or thinner, and ultimately only the base film layer is left. The thickness of the film layer is fixed and depends on the molecular structure of the silane coupling agent, not the coating method. Considering the uneven surface microstructure of the substrate after plasma treatment, and the possibility that the silane coupling agent connected to the substrate may also be connected to another silane coupling agent molecule at the same time, the film thickness may reach 60 nanometers; the plasma treatment of the present invention has an impact on the effect of the implementation of this technology and is used as a preferred method; The core materials of this invention are: sultone + a silane coupling agent containing a nucleophilic nitrogen atom (mainly aminosilane and pyridylsilane) = a silane coupling agent grafted with a sulfonic acid group; the basic film-forming principle: the surface of the substrate is chemically modified with a single molecule, and the substrate surface reacts with a single molecule or a partially condensed silane coupling agent molecular cluster. There is no film-forming material in the system, and the final film layer is also a discontinuous film; the coating method and curing principle: thermal curing condensation, one-time coating, and cleaning after curing.

[0039] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A super-hydrophilic coating material based on sulfonic acid modified silane, characterized in that: A hydrophilic modifier is coated on the surface of a substrate, and after baking and curing, the substrate is washed with water to obtain a super-hydrophilic coating material based on sulfonic acid group-modified silane on the surface of the substrate.

2. The super-hydrophilic coating material based on sulfonic acid modified silane according to claim 1, characterized in that: The substrate is a substrate containing silicon dioxide or a substrate with a silicon dioxide content greater than 25% in the surface layer.

3. The super-hydrophilic coating material based on sulfonic acid modified silane according to claim 2, characterized in that: The substrate includes glass, any substrate with silicon dioxide plated on its surface, and a plastic substrate with a surface coated with a resin containing silicon dioxide.

4. The super-hydrophilic coating material based on sulfonic acid modified silane according to claim 1, characterized in that: The hydrophilic modifier comprises 0.5% WT to 10% WT of modified silane, 0.01% WT to 5% WT of spreading agent, 0.05% WT to 2% WT of pH buffer, and the rest is hydrolysis solution.

5. The super-hydrophilic coating material based on sulfonic acid modified silane according to claim 4, characterized in that: The raw materials of the modified silane include sultone and silane containing a nucleophilic nitrogen atom.

6. The super-hydrophilic coating material based on sulfonic acid modified silane according to claim 5, characterized in that: The sultone is one or a combination of propane sultone and butane sultone, the silane containing a nucleophilic nitrogen atom is a silane containing a primary amine / secondary amine / pyridyl group, and the molar ratio of the sultone to the silane containing a primary amine / secondary amine / pyridyl group is 1:0.3 to 1:1.

5.

7. The super-hydrophilic coating material based on sulfonic acid modified silane according to claim 4, characterized in that: The hydrolysis solution is an alcohol-water composite solution, the volume ratio of alcohol to deionized water in the alcohol-water composite solution is 1:0.5 to 1:20, the alcohol includes one or more of ethanol, methanol, isopropanol, and n-butanol, the pH of the hydrolysis solution is 3 to 6, and the pH value is adjusted by acetic acid, toluenesulfonic acid, dilute hydrochloric acid, and citric acid.

8. The super-hydrophilic coating material based on sulfonic acid modified silane according to claim 4, characterized in that: The spreading agent is a combination of one or more of polyether-modified silicone, Shin-Etsu KF-6011, BYK-345, and TEGO Glide 435; the pH buffer is an organic sulfonic acid buffer, such as a combination of one or more of 4-hydroxyethylpiperazineethanesulfonic acid, propanesulfonic acid pyridinium salt, and hydroxypropanesulfonic acid pyridinium salt.

9. A method for preparing a super-hydrophilic coating material based on sulfonic acid modified silane, characterized in that: The specific preparation steps are as follows: Step 1: adding propane sultone or butane sultone and a silane containing a primary amine / secondary amine / pyridyl group into a reactor for a ring-opening reaction to obtain a modified silane; Step 2: preparing a hydrolysis solution, adding the modified silane to the hydrolysis solution, stirring at a constant temperature until dissolved, adding a spreading agent and a pH buffer, and stirring at a constant temperature for 0.5 to 24 hours to obtain a hydrophilic modifier; Step 3: performing surface activation treatment on the substrate to obtain a pretreated substrate; Step 4: evenly coating the hydrophilic modifier on the pretreated substrate surface, performing a baking and curing treatment to form a coating on the substrate surface; Step 5: Wash the surface of the substrate with deionized water or wipe the surface of the substrate with a wet cloth to obtain a super-hydrophilic coating material based on sulfonic acid modified silane on the surface of the substrate.

10. The method for preparing a super-hydrophilic coating material based on sulfonic acid modified silane according to claim 9, characterized in that: In step 1, the reaction conditions are: inert gas protection, reaction at room temperature to 120°C for 1 to 12 hours, the reactant is cooled, filtered, and purified by solvent washing to obtain modified silane; in step 2, the constant temperature is: room temperature to 80°C; in step 3, plasma activation treatment is performed on the surface of the substrate, and the plasma treatment conditions are: using O2 / argon mixed gas, power of 50 to 1000W, time of 30 to 300s, and generating Si-OH density ≥3 / nm 2 In step 4, the curing conditions are: baking at 60-150°C for 0.5-24 hours.

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