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

Abstract

The application discloses a super-hydrophobic printing template surface nano coating and a preparation method and application thereof, relates to the field of coating preparation technology, and the raw materials of the nano coating include 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 dispersing agent in terms of weight parts; the raw materials of the octadecane modified graphene oxide include n-octadecane and stearic alcohol modified graphene oxide, and the mass ratio of the two is 1:0.015-0.025; the nano coating provided by the application is applied to the surface of a printing template, so that a printing template with a super-hydrophobic surface can be obtained, and the printing template also has excellent antifouling and wear resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating preparation technology, in particular to a super-hydrophobic printing template surface nano-coating and a preparation method and application thereof. BACKGROUND

[0002] With the development of increasingly precise electronic product manufacturing and the rapid development and progress of chip packaging technology, the requirements and indicators of SMT (Surface Mounting, also known as Surface Mounting) process are also developing in the direction of more and more precision. In this process, increasingly precise process parameters put forward higher precision requirements and quality expectations for SMT printing templates.

[0003] Compared with conventional SMT printing templates, Mini LED packaging precision printing templates 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 position precision requirement is higher than that of ordinary SMT printing templates; the hole wall smoothness requirement is higher, and the hole wall and surface are required to have hydrophobic properties to ensure that as little solder paste (or flux) as possible remains after product printing. Therefore, in order to further improve the hole wall smoothness and printing effect of the SMT printing template, a coating needs to be applied on the surface of the template to improve the printing effect and efficiency of the product.

[0004] However, during the use of the LED precision printing template, it will be subjected to frequent friction and scratching. Due to the insufficient hydrophobicity and wear resistance of the existing coating, it is easy to cause solder paste (or flux) residue and coating wear, thereby affecting the printing quality and service life of the template. Therefore, it is urgent to provide a surface coating with excellent hydrophobicity, stain resistance and wear resistance for the surface of the printing template. SUMMARY

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

[0006] The super-hydrophobic printing template surface nano-coating provided by the present application adopts the following technical scheme:

[0007] The super-hydrophobic printing template surface nano-coating, the raw materials of the nano-coating include 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 dispersant.

[0008] By adopting the technical scheme, the polytetrafluoroethylene emulsion is a low surface energy material in a high polymer material, and has strong hydrophobicity; the n-octadecane is combined with the graphene oxide to reduce the free energy of the graphene surface, and can significantly increase the hydrophobicity of the surface; the n-octadecane modified graphene oxide is compounded into the polytetrafluoroethylene emulsion, and can have synergistic effect to obtain a surface with super-hydrophobic effect, so that the nanometer coating with super-hydrophobicity is obtained; because the water droplets can quickly roll off the surface of the coating, the micro solid pollutants on the surface can be removed, and the tin paste (or flux) residue can be prevented, so that the anti-pollution and self-cleaning effects are excellent; the n-octadecane modified graphene oxide also has excellent mechanical strength, and can effectively enhance the wear resistance of the coating and improve the service life of the template.

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

[0010] By adopting the technical scheme, the stearic alcohol is used to modify and modify the graphene oxide first, the hydrophilic groups on the surface of the graphene oxide are partially replaced by hydrophobic groups, the compatibility between the modified graphene and the n-octadecane is significantly improved, and the n-octadecane can be better compounded with the n-octadecane.

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

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

[0013] Preferably, the dispersant is polyvinylpyrrolidone.

[0014] By adopting the technical scheme, the polyvinylpyrrolidone has excellent dispersing property, can effectively prevent the particles from re-aggregating during the preparation and curing of the coating, and thus improve the stability of the coating; meanwhile, the polyvinylpyrrolidone can also adjust the rheological property of the coating, and effectively improve the processing property of the coating.

[0015] The preparation method of the super-hydrophobic printing template surface nanometer coating provided in the application adopts the following technical scheme:

[0016] The preparation method of the super-hydrophobic printing template surface nanometer coating includes the following steps:

[0017] Mixing 12-20 parts of epoxy acrylate, 4-8 parts of anhydrous ethanol, 10-20 parts of deionized water uniformly, slowly drop into 72-80 parts of polytetrafluoroethylene emulsion, ultrasonic oscillation for 10-20 min, then add 2-4 parts of octadecane modified graphene oxide and 0.5-1 part of dispersant, ultrasonic oscillation for 15-25 min, then stand for reaction at room temperature for 1-2 h, to obtain polytetrafluoroethylene composite spraying liquid; the polytetrafluoroethylene composite spraying liquid is sprayed on the surface of the substrate by a spray gun, and after drying, a nano coating is obtained.

[0018] Preferably, the preparation method of the octadecane modified graphene oxide comprises the following steps:

[0019] After drying the n-octadecane, melting it at 65-85℃, adding the stearyl alcohol modified graphene oxide into the melted n-octadecane, magnetic stirring at 65-85℃ and a stirring speed of 450-650 rpm for 3-5 h, then ultrasonic treatment for 30-50 min, and cooling to solidification at room temperature, the octadecane modified graphene oxide is obtained.

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

[0021] Mixing 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, stirring at 80-90℃ for 1-3 h, then refluxing for 100-140 h, filtering the obtained solid product, washing and drying to obtain the stearyl alcohol modified graphene oxide;

[0022] The preparation method of the pretreated graphene oxide comprises the following steps:

[0023] Dispersing 1-2 parts of graphene oxide in 27-54 parts of N,N-dimethylformamide, adding 160-260 parts of thionyl chloride, treating at 75-85℃ for 10-14 h, after the reaction is completed, washing and drying to obtain the pretreated graphene oxide.

[0024] The application provides the application of the super-hydrophobic printing template surface nano coating in the precise printing template surface of an LED, and the following technical scheme is adopted:

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

[0026] S2. Cutting the nickel-iron alloy thin layer material selected in S1 into a desired size;

[0027] S3. The cut nickel-iron alloy thin layer material in S2 is opened on the SMT printing template, and polytetrafluoroethylene composite spraying liquid is sputtered on the edge of the opening and the inner part of the hole wall respectively, and after drying, a nano coating is obtained.

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

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

[0030] 1. The present application modifies octadecane modified graphene oxide into polytetrafluoroethylene emulsion, which can obtain a coating with super-hydrophobic effect through synergistic effect;

[0031] 2. The nano coating provided by the present application can help to remove the tiny solid pollutants on the surface and prevent the tin paste (or flux) from remaining, because the water droplets can quickly roll off the surface of the coating, thereby having excellent anti-pollution and self-cleaning effect;

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

[0033] The present application will be further described in detail below in combination with examples.

[0034] The chemical reagents used in the examples and comparative examples provided by the present application are all commercially available goods, and their brand and manufacturer are as follows:

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

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

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

[0038] Preparation Example

[0039] Preparation Example 1

[0040] T1. Disperse 1g of graphene oxide in 27g of N,N-dimethylformamide, add 160g of thionyl chloride, and treat at 75℃ for 10h. After the reaction is completed, wash the reaction product with dichloromethane, and dry in a vacuum oven at 60℃ to obtain pretreated graphene oxide.

[0041] T2. 2 g of the pretreated graphene oxide from T1, 30 g of stearyl alcohol, 3 g of triethylamine, 26 g of toluene, 9 g of N,N-dimethylformamide were mixed and stirred at 80 °C for 3 h, then refluxed for 140 h, the solid product was filtered, the product was 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. 100 g of n-octadecane was dried, melted at 65 °C, 1.5 g of stearyl alcohol-modified graphene oxide from T2 was added to the melted n-octadecane, magnetically stirred at 65 °C with a stirring speed of 450 rpm for 5 h, then ultrasonically treated in an ultrasonic cleaner for 30 min, and cooled to solidification at room temperature to obtain 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, 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 from T1, 45 g of stearyl alcohol, 4.5 g of triethylamine, 39 g of toluene, 13.5 g of N,N-dimethylformamide were mixed and stirred at 85 °C for 2 h, then refluxed for 120 h, the solid product was filtered, the product was 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. 100 g of n-octadecane was dried, melted at 75 °C, 1.5 g of stearyl alcohol-modified graphene oxide from T2 was added to the melted n-octadecane, magnetically stirred at 75 °C with a stirring speed of 550 rpm for 4 h, then ultrasonically treated in an ultrasonic cleaner for 40 min, and cooled to solidification at room temperature to obtain 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, 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 from T1, 60 g of stearyl alcohol, 6 g of triethylamine, 52 g of toluene, 18 g of N,N-dimethylformamide were mixed and stirred at 90 °C for 1 h, then refluxed for 100 h, the solid product obtained was filtered, the product was washed several times with ethanol to remove unreacted stearyl alcohol, and after drying in a vacuum oven at 65 °C, stearyl alcohol-modified graphene oxide was obtained;

[0050] T3. 100 g of n-octadecane was dried, melted at 85 °C, 1.5 g of stearyl alcohol-modified graphene oxide obtained from T2 was added to the melted n-octadecane, and stirred at 85 °C at a stirring speed of 650 rpm for 3 h, then ultrasonically treated in an ultrasonic cleaner for 50 min, and cooled to solidification at room temperature to obtain octadecane-modified graphene oxide.

[0051] Preparation Example 4

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

[0053] Preparation Example 5

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

[0055] Preparation Example 6

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

[0057] Preparation Example 7

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

[0059] Example

[0060] Example 1

[0061] Mix 12 g of epoxy acrylate, 4 g of anhydrous ethanol, 10 g of deionized water uniformly, then slowly drop into 72 g of polytetrafluoroethylene emulsion, ultrasonic oscillation for 10 min, then add 2 g of octadecane modified graphene oxide prepared by preparation example 1, 0.5 g of dispersant polyvinylpyrrolidone, ultrasonic oscillation for 15 min, then stand at room temperature for 1 h, the obtained polytetrafluoroethylene composite spraying liquid; the polytetrafluoroethylene composite spraying liquid is sprayed on the surface of the substrate by a spray gun, and after drying, a nano coating is obtained.

[0062] Example 2

[0063] Mix 16 g of epoxy acrylate, 6 g of anhydrous ethanol, 15 g of deionized water uniformly, then slowly drop into 76 g of polytetrafluoroethylene emulsion, ultrasonic oscillation for 15 min, then add 2 g of octadecane modified graphene oxide prepared by preparation example 1, 0.5 g of dispersant polyvinylpyrrolidone, ultrasonic oscillation for 20 min, then stand at room temperature for 1.5 h, the obtained polytetrafluoroethylene composite spraying liquid; the polytetrafluoroethylene composite spraying liquid is sprayed on the surface of the substrate by a spray gun, and after drying, a nano coating is obtained.

[0064] Example 3

[0065] Mix 20 g of epoxy acrylate, 8 g of anhydrous ethanol, 20 g of deionized water uniformly, then slowly drop into 80 g of polytetrafluoroethylene emulsion, ultrasonic oscillation for 20 min, then add 2 g of octadecane modified graphene oxide prepared by preparation example 1, 0.5 g of dispersant polyvinylpyrrolidone, ultrasonic oscillation for 25 min, then stand at room temperature for 2 h, the obtained polytetrafluoroethylene composite spraying liquid; the polytetrafluoroethylene composite spraying liquid is sprayed on the surface of the substrate by a spray gun, and after drying, a nano coating is obtained.

[0066] Example 4

[0067] The difference between example 4 and example 1 is that the mass of 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 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 dispersant polyvinylpyrrolidone 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 dispersant polyvinylpyrrolidone used in example 7 is 1 g.

[0074] Example 8

[0075] Example 8 differs from Example 1 in that the octadecane-modified graphene oxide employed in Example 8 is from Preparation Example 2 and has a mass of 2 g.

[0076] Example 9

[0077] Example 9 differs from Example 1 in that the octadecane-modified graphene oxide employed in Example 9 is from Preparation Example 3 and has a mass of 2 g.

[0078] Example 10

[0079] Example 10 differs from Example 1 in that the octadecane-modified graphene oxide employed in Example 10 is from Preparation Example 4 and has a mass of 2 g.

[0080] Example 11

[0081] Example 11 differs from Example 1 in that the octadecane-modified graphene oxide employed in Example 11 is from Preparation Example 5 and has a mass of 2 g.

[0082] Example 12

[0083] Example 12 differs from Example 1 in that the octadecane-modified graphene oxide employed in Example 12 is from Preparation Example 6 and has a mass of 2 g.

[0084] Example 13

[0085] Example 13 differs from Example 1 in that the octadecane-modified graphene oxide employed in Example 13 is from Preparation Example 7 and has a mass of 2 g.

[0086] Comparative Example

[0087] Comparative Example 1

[0088] Comparative Example 1 differs from Example 1 in that the octadecane-modified graphene oxide employed in Comparative Example 1 has a mass of 1 g.

[0089] Comparative Example 2

[0090] Comparative Example 2 differs from Example 1 in that the octadecane-modified graphene oxide employed in Comparative Example 2 has a mass of 5 g.

[0091] Comparative Example 3

[0092] Comparative Example 3 differs from Example 1 in that the dispersant polyvinylpyrrolidone employed in Comparative Example 3 has a mass of 0 g.

[0093] Comparative Example 4

[0094] Comparative Example 4 differs from Example 1 in that the dispersant polyvinylpyrrolidone used in Comparative Example 4 has a mass of 1.5 g.

[0095] Application Example

[0096] Application Example 1

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

[0098] S2. Cut the thin layer of nickel-iron alloy material selected in S1 to a thickness of 0.05 mm;

[0099] S3. Open holes in the thin layer of nickel-iron alloy material cut in S2 on an SMT printing template, with a hole diameter of 0.02 mm, and sputter the polytetrafluoroethylene composite spray liquid in Example 1 on the edge of the opening and the inner wall of the hole, respectively, to obtain a nanometer coating layer with a thickness of 50 nanometers after drying.

[0100] Application Example 2

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

[0102] S2. Cut the thin layer of nickel-iron alloy material selected in S1 to a thickness of 0.05 mm;

[0103] S3. Open holes in the thin layer of nickel-iron alloy material cut in S2 on an SMT printing template, with a hole diameter of 0.02 mm, and sputter the polytetrafluoroethylene composite spray liquid in Example 1 on the edge of the opening and the inner wall of the hole, respectively, to obtain a nanometer coating layer with a thickness of 70 nanometers after drying.

[0104] Application Example 3

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

[0106] S2. Cut the thin layer of nickel-iron alloy material selected in S1 to a thickness of 0.05 mm;

[0107] S3. Open holes in the thin layer of nickel-iron alloy material cut in S2 on an SMT printing template, with a hole diameter of 0.02 mm, and sputter the polytetrafluoroethylene composite spray liquid in Example 1 on the edge of the opening and the inner wall of the hole, respectively, to obtain a nanometer coating layer with a thickness of 90 nanometers after drying.

[0108] Application Examples 4-16

[0109] Application Example 4-15 differs from Application Example 1 in that the polytetrafluoroethylene composite spray liquid used in Application Example 4-16 is 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 is from Comparative Examples 1-4, respectively.

[0112] Performance detection test

[0113] I. Hydrophobicity test: the water contact angle and the rolling angle of the nano coating on the surface of the printed template obtained from Application Examples 1-15 and Comparative Application Examples 1-4 are detected using a contact angle measuring instrument, each sample is tested in parallel for 3 times, and the average value is taken, and the results are shown in Table 1.

[0114] II. Abrasion resistance test: the steel wool (size 5mm x 2mm x 2mm) is contacted with the coating surface of Application Examples 1-15 and Comparative Application Examples 1-4, a load of 1kgf is applied, and then the steel wool is reciprocated at a speed of 140mm / s under the condition of this applied load contact, and the static contact angle and the rolling angle of water are measured after 4000 reciprocations, and the results are shown in Table 1.

[0115] The specific detection results are as follows:

[0116] Table 1 Performance detection results

[0117]

[0118] As can be seen from the detection results in Table 1, the water contact angle of the super-hydrophobic printed template surface nano coating provided by the present application is greater than 150°, and the rolling angle is less than 10°, which has super-hydrophobicity, and after the friction resistance test, the water contact angle is still greater than 150°, and the rolling angle is less than 10°, which shows that the nano coating provided by the present application has excellent abrasion resistance.

[0119] As can be seen from the detection results of Application Examples 1-3, the nano coating provided by the present application applied to the surface of the LED precision printed template can make the surface of the printed template have super-hydrophobicity and strong abrasion resistance, and the thickness of the preferred nano coating is 50-90 nanometers.

[0120] As can be seen from the detection results of Application Examples 1, 4 and 5, the formula and preparation process of the nano coating provided by the present application can effectively obtain a nano coating with super-hydrophobicity and abrasion resistance.

[0121] As can be seen from the detection results of Application Examples 1, 6, 7 and Comparative Application Examples 1-2, 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 rolling angle first decreases and then increases, so the weight of the octadecane modified graphene oxide is preferably 2-4 parts.

[0122] From the detection results of application examples 1, 8, 9 and comparative application examples 3-4, it can be seen that when the mass of the dispersing agent used in the coating provided by the application gradually increases, the water contact angle of the coating first increases and then decreases, and the rolling angle first decreases and then increases, so the weight of the dispersing agent is preferably 0.5-1 parts.

[0123] From the detection results of application examples 1, 10, 11, it can be seen that the formula and preparation process of octadecane modified graphene oxide provided by the application can effectively obtain a nano coating with superhydrophobicity and wear resistance.

[0124] From the detection results of application examples 1, 12, 13, 14, 15, it can be seen that when the mass ratio of n-octadecane to stearic alcohol modified graphene oxide used to prepare the octadecane modified graphene oxide 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 nano coating, but when the mass ratio of n-octadecane to stearic alcohol modified graphene oxide is outside this range, the hydrophobicity and wear resistance of the obtained nano coating obviously decrease.

[0125] The specific embodiments are only an explanation of the application, and are not a limitation of the application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the application, they are protected by the patent law.

Claims

1. The use of a superhydrophobic printed stencil surface nanocoating on a LED precision printed stencil surface, characterized in that: The application relates to a preparation method of a super-hydrophobic printing template surface nano coating. S1. selecting a thin layer of nickel-iron alloy material; S2. cutting the thin layer of nickel-iron alloy material selected in S1 into pieces with required sizes; S3. drilling holes in the thin layer of nickel-iron alloy material cut in S2 on an SMT printing template, and respectively spraying polytetrafluoroethylene composite spraying liquid on the edges of the holes and the inner walls of the holes, and obtaining a nano coating after drying; The polytetrafluoroethylene composite spraying liquid is prepared from a nano coating raw material; The nano coating raw material comprises 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; The octadecane modified graphene oxide raw material comprises n-octadecane and stearic alcohol modified graphene oxide, and the mass ratio of the two is 1:0.015-0.025; The stearic alcohol modified graphene oxide is composed of the following raw materials in parts by weight: pretreated graphene oxide 2-4 parts, stearic alcohol 30-60 parts, triethylamine 3-6 parts, toluene 26-52 parts and N,N-dimethylformamide 9-18 parts; The pretreated graphene oxide is composed of the following raw materials in parts by weight: graphene oxide 1-2 parts, N,N-dimethylformamide 27-54 parts and thionyl chloride 160-260 parts.

2. The use of a superhydrophobic printed stencil surface nanocoating according to claim 1 for LED precision printed stencil surfaces, characterized by: The dispersant is polyvinylpyrrolidone.

3. The use of a superhydrophobic printed stencil surface nanocoating according to claim 1 for LED precision printed stencil surfaces, characterized by: The preparation method of the super-hydrophobic printing template surface nano coating comprises the following steps: 12-20 parts of epoxy acrylate, 4-8 parts of anhydrous ethanol and 10-20 parts of deionized water are uniformly mixed, then 72-80 parts of polytetrafluoroethylene emulsion is slowly dropped, ultrasonic oscillation is carried out for 10-20 min, then 2-4 parts of octadecane modified graphene oxide and 0.5-1 part of a dispersant are added, ultrasonic oscillation is carried out for 15-25 min, then the mixture is left to react at room temperature for 1-2 h, and the obtained polytetrafluoroethylene composite spraying liquid is obtained; the polytetrafluoroethylene composite spraying liquid is sprayed on the surface of a substrate by using a spray gun, and after drying, a nano coating is obtained.

4. The use of a superhydrophobic printed stencil surface nanocoating according to claim 3 for LED precision printed stencil surfaces, characterized by: The preparation method of the octadecane modified graphene oxide comprises the following steps: After the n-octadecane is dried and treated, it is melted at 65-85 DEG C, the stearic alcohol modified graphene oxide is added into the melted n-octadecane, magnetic stirring is carried out at 65-85 DEG C and a stirring speed of 450-650 rpm for 3-5 h, then ultrasonic treatment is carried out for 30-50 min, and the mixture is cooled to solidification at room temperature, and the octadecane modified graphene oxide is obtained.

5. The use of a superhydrophobic printed stencil surface nanocoating according to claim 4 for LED precision printed stencil surfaces, characterized by: The preparation method of the stearic alcohol modified graphene oxide comprises the following steps: 2-4 parts of pretreated graphene oxide, 30-60 parts of stearic alcohol, 3-6 parts of triethylamine, 26-52 parts of toluene and 9-18 parts of N,N-dimethylformamide are mixed, stirring is carried out at 80-90 DEG C for 1-3 h, then reflux reaction is carried out for 100-140 h, the obtained solid product is filtered, washed and dried, and the stearic alcohol modified graphene oxide is obtained; The preparation method of the pretreated graphene oxide comprises the following steps: The 1-2 parts of graphene oxide is dispersed in 27-54 parts of N,N-dimethylformamide, 160-260 parts of thionyl chloride is added, and treated at 75-85℃ for 10-14h. After the reaction is completed, the pretreated graphene oxide is obtained after washing and drying.

6. The use of a superhydrophobic printed stencil surface nanocoating according to claim 1 for LED precision printed stencil surfaces, characterized by: The thickness of the nano coating is 50-90 nanometers.

Images