Super-hydrophobic printing template surface nano coating as well as preparation method and application thereof

Abstract

The invention discloses a super-hydrophobic printing template surface nano coating as well as a preparation method and application thereof, and relates to the technical field of coating preparation, the nano coating is prepared from the following raw materials in parts by weight: 12-20 parts of epoxy acrylate, 4-8 parts of absolute ethyl alcohol, 10-20 parts of deionized water, 72-80 parts of polytetrafluoroethylene emulsion, 2-4 parts of octadecane modified graphene oxide and 0.5-1 part of a dispersing agent; the octadecane modified graphene oxide raw materials comprise n-octadecane and stearyl alcohol modified graphene oxide, and the mass ratio of the n-octadecane to the stearyl alcohol modified graphene oxide is 1: (0.015-0.025); when the nano-coating provided by the invention is applied to the surface of the printing template, the printing template with super-hydrophobicity on the surface can be obtained, and the nano-coating also has excellent antifouling and wear-resistant properties.

Description

Technical Field

[0001] The present application relates to the field of coating preparation technology, and in particular to a super-hydrophobic printing template surface nanocoating and its preparation method and application. Background Art

[0002] With the increasing sophistication of electronic product manufacturing and the rapid development and advancement of chip packaging technology, the requirements and specifications of SMT (surface mount) processes are also becoming increasingly precise. In this process, increasingly sophisticated process parameters are placing higher precision requirements and quality expectations on SMT printing templates.

[0003] Compared to conventional SMT printing templates, precision printing templates for Mini LED packaging have higher technical requirements: the product thickness is thinner than that of conventional SMT printing templates; the opening size is smaller than that of conventional SMT printing templates; the positioning accuracy requirements are higher than that of ordinary SMT printing templates; the hole wall smoothness requirements are higher, and the hole wall and surface must be hydrophobic to ensure that the product has minimal solder paste (or flux) residue after printing. Therefore, to further improve the hole wall smoothness and printing effect of the SMT printing template, a coating is required on the template surface to improve the product printing effect and efficiency.

[0004] However, LED precision printing templates are subject to frequent friction and scratching during use. Due to the insufficient hydrophobicity and wear resistance of existing coatings, it is easy to cause solder paste (or flux) residue and coating wear, which in turn affects the printing quality and the service life of the template. Therefore, there is an urgent need to provide a surface coating with excellent hydrophobicity, anti-fouling and wear resistance for the surface of the printing template. Summary of the Invention

[0005] In order to improve the hydrophobicity, antifouling and wear resistance of the coating, the present application provides a super-hydrophobic printing template surface nano-coating and its preparation method and application.

[0006] The super-hydrophobic printing template surface nano-coating provided in this application adopts the following technical solutions:

[0007] The invention discloses a super-hydrophobic nano coating on the surface of a printing template. The raw materials of the nano coating include, by weight, 12-20 parts of epoxy acrylate, 4-8 parts of anhydrous ethanol, 10-20 parts of deionized water, 72-80 parts of polytetrafluoroethylene emulsion, 2-4 parts of octadecane-modified graphene oxide, and 0.5-1 part of a dispersant.

[0008] By adopting the above technical solution, polytetrafluoroethylene emulsion, as a low surface energy material among polymer materials, has strong hydrophobic properties; n-octadecane, as a long-chain alkyl, reduces the free energy of the graphene surface after combining with graphene oxide, and can significantly increase the hydrophobic properties of its surface; compounding octadecane-modified graphene oxide into polytetrafluoroethylene emulsion can synergistically enhance the effect and obtain a surface with a super-hydrophobic effect, thereby obtaining a nano-coating with super-hydrophobicity; because water droplets can roll off the coating surface quickly, they help to remove tiny solid contaminants on the surface and prevent solder paste (or flux) residues, thereby having excellent anti-fouling and self-cleaning effects; octadecane-modified graphene oxide also has excellent mechanical strength, can effectively enhance the wear resistance of the coating, and improve the service life of the template.

[0009] Preferably, the octadecane-modified graphene oxide raw material includes n-octadecane and stearyl alcohol-modified graphene oxide, and the mass ratio of the two is 1:0.015-0.025.

[0010] By adopting the above technical solution, graphene oxide is first modified with stearyl alcohol, and the hydrophilic groups on the surface of graphene oxide are partially replaced by hydrophobic groups, so that the compatibility between the modified graphene and n-octadecane is significantly improved, so that it can be better composited with n-octadecane.

[0011] Preferably, the stearyl alcohol-modified graphene oxide is composed of the following raw materials in parts by weight: 2-4 parts of pretreated graphene oxide, 30-60 parts of stearyl alcohol, 3-6 parts of triethylamine, 26-52 parts of toluene, and 9-18 parts of N,N-dimethylformamide.

[0012] Preferably, the pretreated graphene oxide is composed of the following raw materials in parts by weight: 1-2 parts of graphene oxide, 27-54 parts of N,N-dimethylformamide, and 160-260 parts of thionyl chloride.

[0013] Preferably, the dispersant is polyvinyl pyrrolidone.

[0014] By adopting the above technical solution, polyvinyl pyrrolidone has excellent dispersibility, which can effectively prevent particles from re-aggregating during the coating preparation and curing process, thereby improving the stability of the coating; at the same time, polyvinyl pyrrolidone can also adjust the rheological properties of the coating and effectively improve the processing performance of the coating.

[0015] The method for preparing the super-hydrophobic printing template surface nanocoating provided in this application adopts the following technical solution:

[0016] The method for preparing a super-hydrophobic printing template surface nanocoating comprises the following steps:

[0017] After uniformly mixing 12-20 parts of epoxy acrylate, 4-8 parts of anhydrous ethanol, and 10-20 parts of deionized water, 72-80 parts of polytetrafluoroethylene emulsion are slowly added dropwise, and ultrasonically vibrate for 10-20 minutes. Then, 2-4 parts of octadecane-modified graphene oxide and 0.5-1 part of a dispersant are added, and ultrasonically vibrate for 15-25 minutes. The mixture is allowed to stand and react at room temperature for 1-2 hours to obtain a polytetrafluoroethylene composite spray liquid. The polytetrafluoroethylene composite spray liquid is applied to the surface of a substrate with a spray gun, and after drying, a nano coating is obtained.

[0018] Preferably, the method for preparing octadecane-modified graphene oxide comprises the following steps:

[0019] After drying n-octadecane and melting it at 65-85° C., the stearyl alcohol-modified graphene oxide is added to the melted n-octadecane, and magnetic stirring is carried out at 65-85° C. and a stirring speed of 450-650 rpm for 3-5 hours. Then, ultrasonic treatment is carried out for 30-50 minutes, and the mixture is cooled at room temperature until solidified to obtain octadecane-modified graphene oxide.

[0020] Preferably, the preparation method of the stearyl alcohol-modified graphene oxide comprises the following steps:

[0021] Mix 2-4 parts of pretreated graphene oxide, 30-60 parts of stearyl alcohol, 3-6 parts of triethylamine, 26-52 parts of toluene, and 9-18 parts of N,N-dimethylformamide, stir at 80-90° C. for 1-3 hours, then reflux for 100-140 hours, filter the obtained solid product, wash, and dry it to obtain stearyl alcohol-modified graphene oxide;

[0022] The method for preparing the pretreated graphene oxide comprises the following steps:

[0023] 1-2 parts of graphene oxide are dispersed in 27-54 parts of N,N-dimethylformamide, 160-260 parts of thionyl chloride are added, and the mixture is treated at 75-85° C. for 10-14 hours. After the reaction is completed, the mixture is washed and dried to obtain pretreated graphene oxide.

[0024] The application of the super-hydrophobic printing template surface nano-coating provided in this application on the surface of LED precision printing template adopts the following technical solutions:

[0025] S1. Select nickel-iron alloy thin layer material;

[0026] S2 S1 selected nickel-iron alloy thin layer material according to the required size cut;

[0027] S3. The nickel-iron alloy thin layer material cut in S2 is used to make holes on the SMT printing template, and polytetrafluoroethylene composite spray liquid is sputtered on the edge of the hole and the inside of the hole wall, and a nano coating is obtained after drying.

[0028] Preferably, the thickness of the nanocoating is 50-90 nanometers.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. This application compounds octadecane-modified graphene oxide into a polytetrafluoroethylene emulsion, and through synergistic effects, a coating with a superhydrophobic effect can be obtained;

[0031] 2. The nanocoating provided by this application has excellent anti-fouling and self-cleaning effects because water droplets can quickly roll off the coating surface, helping to remove tiny solid contaminants on the surface and prevent solder paste (or flux) residue;

[0032] 3. The octadecane-modified graphene oxide provided in this application also has excellent mechanical strength, which can effectively enhance the wear resistance of the coating and increase the service life of the template. DETAILED DESCRIPTION

[0033] The present application is further described in detail below with reference to the embodiments.

[0034] The chemical reagents used in the examples and comparative examples provided by the present invention are all commercially available products, and their brands and manufacturers are as follows:

[0035] Epoxy acrylate, Hubei Xinmingtai Chemical Co., Ltd., 98% HPLC;

[0036] Polytetrafluoroethylene emulsion, Shanghai Xige Biotechnology Co., Ltd.;

[0037] Polyvinylpyrrolidone, Shanghai Aladdin Biochemical Technology Co., Ltd., P110607.

[0038] Preparation Example

[0039] Preparation Example 1

[0040] T1. 1 g of graphene oxide was dispersed in 27 g of N,N-dimethylformamide, 160 g of thionyl chloride was added, and the mixture was treated at 75°C for 10 h. After the reaction, the reaction product was washed with dichloromethane and dried in a vacuum oven at 60°C to obtain pretreated graphene oxide.

[0041] T2. 2 g of the pretreated graphene oxide obtained in T1, 30 g of stearyl alcohol, 3 g of triethylamine, 26 g of toluene, and 9 g of N,N-dimethylformamide were mixed and stirred at 80°C for 3 h, followed by reflux for 140 h. The resulting solid product was filtered, washed several times with ethanol to remove unreacted stearyl alcohol, and dried in a vacuum oven at 55°C to obtain stearyl alcohol-modified graphene oxide.

[0042] T3. After drying 100 g of n-octadecane and melting it at 65°C, 1.5 g of the stearyl alcohol-modified graphene oxide obtained in T2 was added to the molten n-octadecane. The mixture was magnetically stirred at 65°C and 450 rpm for 5 h. The mixture was then ultrasonically cleaned in an ultrasonic cleaner for 30 min. The mixture was cooled at room temperature until solidified, thereby obtaining octadecane-modified graphene oxide.

[0043] Preparation Example 2

[0044] T1. 1.5 g of graphene oxide was dispersed in 40.5 g of N,N-dimethylformamide, 210 g of thionyl chloride was added, and the mixture was treated at 80 ° C for 12 h. After the reaction was completed, the reaction product was washed with dichloromethane and dried in a vacuum oven at 65 ° C to obtain pretreated graphene oxide;

[0045] T2. 3 g of the pretreated graphene oxide obtained in T1, 45 g of stearyl alcohol, 4.5 g of triethylamine, 39 g of toluene, and 13.5 g of N,N-dimethylformamide were mixed and stirred at 85°C for 2 h, followed by reflux for 120 h. The resulting solid product was filtered, washed several times with ethanol to remove unreacted stearyl alcohol, and dried in a vacuum oven at 60°C to obtain stearyl alcohol-modified graphene oxide.

[0046] T3. After drying 100 g of n-octadecane and melting it at 75°C, 1.5 g of the stearyl alcohol-modified graphene oxide obtained in T2 was added to the molten n-octadecane. The mixture was magnetically stirred at 75°C and 550 rpm for 4 h. The mixture was then ultrasonically cleaned in an ultrasonic cleaner for 40 min. The mixture was cooled at room temperature until solidified, thereby obtaining octadecane-modified graphene oxide.

[0047] Preparation Example 3

[0048] T1. 2 g of graphene oxide was dispersed in 54 g of N,N-dimethylformamide, 260 g of thionyl chloride was added, and the mixture was treated at 85 ° C for 14 h. After the reaction was completed, the reaction product was washed with dichloromethane and dried in a vacuum oven at 70 ° C to obtain pretreated graphene oxide;

[0049] T2. 4 g of the pretreated graphene oxide obtained in T1, 60 g of stearyl alcohol, 6 g of triethylamine, 52 g of toluene, and 18 g of N,N-dimethylformamide were mixed and stirred at 90°C for 1 h, followed by reflux for 100 h. The resulting solid product was filtered, washed several times with ethanol to remove unreacted stearyl alcohol, and dried in a vacuum oven at 65°C to obtain stearyl alcohol-modified graphene oxide.

[0050] T3. After drying 100 g of n-octadecane and melting it at 85°C, 1.5 g of the stearyl alcohol-modified graphene oxide obtained in T2 was added to the molten n-octadecane. The mixture was magnetically stirred at 85°C and 650 rpm for 3 h. The mixture was then ultrasonically cleaned in an ultrasonic cleaner for 50 min. The mixture was cooled at room temperature until solidified, thereby obtaining octadecane-modified graphene oxide.

[0051] Preparation Example 4

[0052] The technical feature that distinguishes Preparation Example 4 from Preparation Example 1 is that in Preparation Example 4, the mass of n-octadecane used in T3 is 100 g, and the mass of stearyl alcohol-modified graphene oxide is 2 g.

[0053] Preparation Example 5

[0054] The technical feature that distinguishes Preparation Example 5 from Preparation Example 1 is that in Preparation Example 5, the mass of n-octadecane used in T3 is 100 g, and the mass of stearyl alcohol-modified graphene oxide is 2.5 g.

[0055] Preparation Example 6

[0056] The technical feature that distinguishes Preparation Example 6 from Preparation Example 1 is that in Preparation Example 6, the mass of n-octadecane used in T3 is 100 g, and the mass of stearyl alcohol-modified graphene oxide is 1 g.

[0057] Preparation Example 7

[0058] The technical feature that distinguishes Preparation Example 7 from Preparation Example 1 is that the mass of n-octadecane used in T3 in Preparation Example 7 is 100 g, and the mass of stearyl alcohol-modified graphene oxide is 3 g.

[0059] Example

[0060] Example 1

[0061] After uniformly mixing 12 g of epoxy acrylate, 4 g of anhydrous ethanol, and 10 g of deionized water, 72 g of polytetrafluoroethylene emulsion was slowly added dropwise, and ultrasonic oscillation was performed for 10 minutes. Then, 2 g of octadecane-modified graphene oxide prepared in Preparation Example 1 and 0.5 g of dispersant polyvinyl pyrrolidone were added. After ultrasonic oscillation for 15 minutes, the mixture was allowed to stand at room temperature for 1 hour to obtain a polytetrafluoroethylene composite spray liquid. The polytetrafluoroethylene composite spray liquid was applied to the surface of the substrate with a spray gun, and after drying, a nanocoating was obtained.

[0062] Example 2

[0063] After uniformly mixing 16 g of epoxy acrylate, 6 g of anhydrous ethanol, and 15 g of deionized water, 76 g of polytetrafluoroethylene emulsion was slowly added dropwise, and ultrasonic oscillation was performed for 15 minutes. Then, 2 g of octadecane-modified graphene oxide prepared in Preparation Example 1 and 0.5 g of dispersant polyvinyl pyrrolidone were added. After ultrasonic oscillation for 20 minutes, the mixture was allowed to stand at room temperature for 1.5 hours to obtain a polytetrafluoroethylene composite spray liquid. The polytetrafluoroethylene composite spray liquid was applied to the surface of the substrate with a spray gun, and after drying, a nanocoating was obtained.

[0064] Example 3

[0065] After uniformly mixing 20 g of epoxy acrylate, 8 g of anhydrous ethanol, and 20 g of deionized water, 80 g of polytetrafluoroethylene emulsion was slowly added dropwise, and ultrasonic oscillation was performed for 20 minutes. Then, 2 g of octadecane-modified graphene oxide prepared in Preparation Example 1 and 0.5 g of dispersant polyvinyl pyrrolidone were added. After ultrasonic oscillation for 25 minutes, the mixture was allowed to stand at room temperature for 2 hours to obtain a polytetrafluoroethylene composite spray liquid. The polytetrafluoroethylene composite spray liquid was applied to the surface of the substrate with a spray gun, and after drying, a nanocoating was obtained.

[0066] Example 4

[0067] The difference between Example 4 and Example 1 is that the mass of the octadecane-modified graphene oxide used in Example 4 is 3 g.

[0068] Example 5

[0069] The difference between Example 5 and Example 1 is that the mass of the octadecane-modified graphene oxide used in Example 5 is 4 g.

[0070] Example 6

[0071] The difference between Example 6 and Example 1 is that the mass of the dispersant polyvinyl pyrrolidone used in Example 6 is 0.8 g.

[0072] Example 7

[0073] The difference between Example 7 and Example 1 is that the mass of the dispersant polyvinyl pyrrolidone used in Example 7 is 1 g.

[0074] Example 8

[0075] The difference between Example 8 and Example 1 is that the octadecane-modified graphene oxide used in Example 8 comes from Preparation Example 2, with a mass of 2 g.

[0076] Example 9

[0077] The difference between Example 9 and Example 1 is that the octadecane-modified graphene oxide used in Example 9 comes from Preparation Example 3, with a mass of 2 g.

[0078] Example 10

[0079] The difference between Example 10 and Example 1 is that the octadecane-modified graphene oxide used in Example 10 comes from Preparation Example 4, with a mass of 2 g.

[0080] Example 11

[0081] The difference between Example 11 and Example 1 is that the octadecane-modified graphene oxide used in Example 11 comes from Preparation Example 5, with a mass of 2 g.

[0082] Example 12

[0083] The difference between Example 12 and Example 1 is that the octadecane-modified graphene oxide used in Example 12 comes from Preparation Example 6, with a mass of 2 g.

[0084] Example 13

[0085] The difference between Example 13 and Example 1 is that the octadecane-modified graphene oxide used in Example 13 comes from Preparation Example 7, with a mass of 2 g.

[0086] Comparative Example

[0087] Comparative Example 1

[0088] The difference between Comparative Example 1 and Example 1 is that the mass of the octadecane-modified graphene oxide used in Comparative Example 1 is 1 g.

[0089] Comparative Example 2

[0090] The difference between Comparative Example 2 and Example 1 is that the mass of the octadecane-modified graphene oxide used in Comparative Example 2 is 5 g.

[0091] Comparative Example 3

[0092] The difference between Comparative Example 3 and Example 1 is that the mass of the dispersant polyvinyl pyrrolidone used in Comparative Example 3 is 0 g.

[0093] Comparative Example 4

[0094] The difference between Comparative Example 4 and Example 1 is that the mass of the dispersant polyvinyl pyrrolidone used in Comparative Example 4 is 1.5 g.

[0095] Application Examples

[0096] Application Example 1

[0097] S1. Select nickel-iron alloy thin layer material;

[0098] S2. The nickel-iron alloy thin layer material selected in S1 is cut into a thickness of 0.05mm;

[0099] S3. The nickel-iron alloy thin layer material cut in S2 is used to open a hole on the SMT printing template with a hole diameter of 0.02 mm. The polytetrafluoroethylene composite spray liquid in Example 1 is sputtered on the edge of the hole and the inside of the hole wall, and a nanocoating with a thickness of 50 nm is obtained after drying.

[0100] Application Example 2

[0101] S1. Select nickel-iron alloy thin layer material;

[0102] S2. The nickel-iron alloy thin layer material selected in S1 is cut into a thickness of 0.05mm;

[0103] S3. The nickel-iron alloy thin layer material cut in S2 is used to open a hole on the SMT printing template with a hole diameter of 0.02 mm. The polytetrafluoroethylene composite spray liquid in Example 1 is sputtered on the edge of the hole and the inside of the hole wall, respectively. After drying, a nanocoating with a thickness of 70 nm is obtained.

[0104] Application Example 3

[0105] S1. Select nickel-iron alloy thin layer material;

[0106] S2. The nickel-iron alloy thin layer material selected in S1 is cut into a thickness of 0.05mm;

[0107] S3. The nickel-iron alloy thin layer material cut in S2 is used to open a hole on the SMT printing template with a hole diameter of 0.02 mm. The polytetrafluoroethylene composite spray liquid in Example 1 is sputtered on the edge of the hole and the inside of the hole wall. After drying, a nanocoating with a thickness of 90 nanometers is obtained.

[0108] Application Example 4-16

[0109] The difference between Application Examples 4-15 and Application Example 1 is that the polytetrafluoroethylene composite spraying liquid used in Application Examples 4-16 comes from Examples 2-13, respectively.

[0110] Comparative Application Examples 1-4

[0111] The difference between Comparative Application Examples 1-4 and Application Example 1 is that the polytetrafluoroethylene composite spraying liquid used in Comparative Application Examples 1-4 comes from Comparative Examples 1-4, respectively.

[0112] Performance testing

[0113] 1. Hydrophobicity test: The water contact angle and rolling angle of the nano-coating on the surface of the printing template obtained from Examples 1-15 and Comparative Examples 1-4 were measured using a contact angle meter. Each sample was tested three times in parallel and the average value was taken. The results are shown in Table 1.

[0114] 2. Wear resistance test: Steel wool (size 5mm×2mm×2mm) was used to contact the coating surface of Application Example 1-15 and Comparative Application Example 1-4, and a load of 1kgf was applied. Then, the steel wool was reciprocated at a speed of 140mm / s under this loaded contact state. After 4000 reciprocating cycles, the static contact angle and rolling angle of water were measured. The results are shown in Table 1.

[0115] The specific test results are as follows:

[0116] Table 1 Performance test results

[0117]

[0118] It can be seen from the test results in Table 1 that the water contact angle of the surface of the super-hydrophobic printing template nanocoating provided in the present application is greater than 150°, and the rolling angle is less than 10°, which shows super-hydrophobicity. After the friction resistance test, the water contact angle can still be maintained greater than 150° and the rolling angle is less than 10°, indicating that the nanocoating provided in the present application has excellent wear resistance.

[0119] It can be seen from the test results of Application Examples 1-3 that the nanocoating provided in this application is applied to the surface of the LED precision printing template, which can make the printing template surface superhydrophobic and highly wear-resistant, and the thickness of the nanocoating is preferably 50-90 nanometers.

[0120] It can be seen from the test results of Application Examples 1, 4, and 5 that the formula and preparation process of the nanocoating provided in this application can effectively obtain a nanocoating with superhydrophobicity and wear resistance.

[0121] It can be seen from the test results of Application Examples 1, 6, 7 and Comparative Application Examples 1-2 that when the mass of octadecane-modified graphene oxide in the coating provided by the present application gradually increases, the water contact angle of the coating first increases and then decreases, and the sliding angle first decreases and then increases. Therefore, the preferred weight portion of octadecane-modified graphene oxide is 2-4 parts.

[0122] It can be seen from the test results of Application Examples 1, 8, 9 and Comparative Application Examples 3-4 that when the mass of the dispersant used in the coating provided in the present application gradually increases, the water contact angle of the coating first increases and then decreases, and the rolling angle first decreases and then increases. Therefore, the preferred weight portion of the dispersant is 0.5-1 part.

[0123] It can be seen from the test results of Application Examples 1, 10, and 11 that the formula and preparation process of octadecane-modified graphene oxide provided in this application can effectively obtain a nanocoating with superhydrophobicity and wear resistance.

[0124] It can be seen from the test results of Application Examples 1, 12, 13, 14, and 15 that when the mass ratio of n-octadecane and stearyl alcohol-modified graphene oxide used in the preparation of octadecane-modified graphene oxide in this application is in the range of 1:0.015-0.025, the obtained octadecane-modified graphene oxide can effectively improve the hydrophobicity and wear resistance of the nanocoating, but when the mass ratio of n-octadecane and stearyl alcohol-modified graphene oxide is outside this range, the hydrophobicity and wear resistance of the obtained nanocoating are significantly reduced.

[0125] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. Super-hydrophobic printing template surface nano-coating, characterized by: The nano coating raw materials include, by weight, 12-20 parts of epoxy acrylate, 4-8 parts of anhydrous ethanol, 10-20 parts of deionized water, 72-80 parts of polytetrafluoroethylene emulsion, 2-4 parts of octadecane-modified graphene oxide, and 0.5-1 part of a dispersant.

2. The super-hydrophobic printing template surface nanocoating according to claim 1, characterized in that: The octadecane-modified graphene oxide raw material includes n-octadecane and stearyl alcohol-modified graphene oxide, and the mass ratio of the two is 1:0.015-0.

025.

3. The super-hydrophobic printing template surface nanocoating according to claim 2, characterized in that: The stearyl alcohol-modified graphene oxide is composed of the following raw materials in parts by weight: 2-4 parts of pretreated graphene oxide, 30-60 parts of stearyl alcohol, 3-6 parts of triethylamine, 26-52 parts of toluene, and 9-18 parts of N,N-dimethylformamide.

4. The super-hydrophobic printing template surface nanocoating according to claim 3, characterized in that: The pretreated graphene oxide is composed of the following raw materials in parts by weight: 1-2 parts of graphene oxide, 27-54 parts of N,N-dimethylformamide, and 160-260 parts of thionyl chloride.

5. The super-hydrophobic printing template surface nanocoating according to claim 1, characterized in that: The dispersant is polyvinyl pyrrolidone.

6. The method for preparing a super-hydrophobic printing template surface nanocoating according to any one of claims 1 to 5, wherein: The following steps are involved: After uniformly mixing 12-20 parts of epoxy acrylate, 4-8 parts of anhydrous ethanol, and 10-20 parts of deionized water, 72-80 parts of polytetrafluoroethylene emulsion are slowly added dropwise, and ultrasonically vibrate for 10-20 minutes. Then, 2-4 parts of octadecane-modified graphene oxide and 0.5-1 part of a dispersant are added, and ultrasonically vibrate for 15-25 minutes. The mixture is allowed to stand and react at room temperature for 1-2 hours to obtain a polytetrafluoroethylene composite spray liquid. The polytetrafluoroethylene composite spray liquid is applied to the surface of a substrate with a spray gun, and after drying, a nano coating is obtained.

7. The method for preparing a super-hydrophobic printing template surface nanocoating according to claim 6, wherein: The preparation method of octadecane-modified graphene oxide comprises the following steps: After drying n-octadecane and melting it at 65-85° C., the stearyl alcohol-modified graphene oxide is added to the melted n-octadecane, and magnetic stirring is carried out at 65-85° C. and a stirring speed of 450-650 rpm for 3-5 hours. Then, ultrasonic treatment is carried out for 30-50 minutes, and the mixture is cooled at room temperature until solidified to obtain octadecane-modified graphene oxide.

8. The method for preparing a super-hydrophobic printing template surface nanocoating according to claim 7, wherein: The preparation method of the stearyl alcohol-modified graphene oxide comprises the following steps: Mix 2-4 parts of pretreated graphene oxide, 30-60 parts of stearyl alcohol, 3-6 parts of triethylamine, 26-52 parts of toluene, and 9-18 parts of N,N-dimethylformamide, stir at 80-90° C. for 1-3 hours, then reflux for 100-140 hours, filter the obtained solid product, wash, and dry it to obtain stearyl alcohol-modified graphene oxide; The method for preparing the pretreated graphene oxide comprises the following steps: 1-2 parts of graphene oxide are dispersed in 27-54 parts of N,N-dimethylformamide, 160-260 parts of thionyl chloride are added, and the mixture is treated at 75-85° C. for 10-14 hours. After the reaction is completed, the mixture is washed and dried to obtain pretreated graphene oxide.

9. Application of the super-hydrophobic printing template surface nanocoating according to any one of claims 1 to 5 on the surface of an LED precision printing template, characterized in that: include: S1. Select nickel-iron alloy thin layer material; S2 S1 selected nickel-iron alloy thin layer material according to the required size cut; S3. The nickel-iron alloy thin layer material cut in S2 is used to make holes on the SMT printing template, and polytetrafluoroethylene composite spray liquid is sputtered on the edge of the hole and the inside of the hole wall, and a nano coating is obtained after drying.

10. The use of the super-hydrophobic printing template surface nano-coating according to claim 9 on the surface of an LED precision printing template, characterized in that: The thickness of the nano coating is 50-90 nanometers.

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