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Method for producing super-hydrophobic polytetrafluoroethylene films through glass template process

A polytetrafluoroethylene and super-hydrophobic technology, which is applied in the field of preparing super-hydrophobic polytetrafluoroethylene films by glass stencil method, can solve the problems of easy wear and tear of imprinting stencils, low reusability, small single production area, etc.

Inactive Publication Date: 2016-10-12
尚蒙科技无锡有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the embossed super-hydrophobic polymer film on the rough surface, the bonding between the embossed template and the polymer film is serious, the embossed template is easy to wear, the reuse rate is low, and the single production area is small. And provide a kind of glass template method to prepare the method for superhydrophobic polytetrafluoroethylene thin film

Method used

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  • Method for producing super-hydrophobic polytetrafluoroethylene films through glass template process
  • Method for producing super-hydrophobic polytetrafluoroethylene films through glass template process
  • Method for producing super-hydrophobic polytetrafluoroethylene films through glass template process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation of ground glass template: (1) Use redox method to make ground glass, using 15-35% sulfuric acid (or hydrochloric acid, nitric acid) with a concentration of 40-60% as oxidant, 5-15% hydrofluoric acid as reducing agent, 40-60% concentration is a mixture of 5-10% ethanol as a buffer and 0.03-0.06% ammonium nitrate as a catalyst, soak for 1-2 hours at room temperature (20-30°C), (2) take out the glass and wash with water Surface residues; (3) Dry the glass surface to obtain textured glass.

[0029] 2. Brush or roll coated with 10% PTFE emulsion (Zhejiang Juhua) on the textured side of the glass plate;

[0030] 3. Dry the ground glass loaded with PTFE emulsion at 90-110℃ for 30-100min;

[0031] 4. Put the dry glass plate with PTFE film into an oven at 300-360℃ for 30min;

[0032] 5. Slowly lower the temperature to 100°C and take out the cured glass plate;

[0033] 6. Gently pull out the polytetrafluoroethylene film at a temperature of 10-50℃ to obtain a super-hydropho...

Embodiment 2

[0036] 1. Preparation of the textured glass template: (1) Configure the redox mixed liquid, including: 100g gallic acid, 305ml ethanolamine, 140ml water, 1.3g pyrazine, 0.24ml FC129 (2) Put the glass in the liquid at room temperature (20 -30℃) Soak for 1-2 hours, then take it out; (3) Wash and clean the surface with water, (4) Dry the textured glass surface;

[0037] 2. Brush or roll coated with 25% PTFE emulsion (Zhejiang Juhua) on the textured side of the glass plate;

[0038] 3. Dry the ground glass with PTFE emulsion at 100°C for 60 minutes;

[0039] 4. Put the dry glass plate with PTFE film into an oven at 320℃ to cure for 20 minutes;

[0040] 5. Slowly lower the temperature to 100°C and take out the cured glass plate;

[0041] 6. Pull out the PTFE film gently at a temperature of 25°C to obtain a super-hydrophobic PTFE film on one side. The static contact angle on the surface is 154 degrees and the rolling angle is 5 degrees;

[0042] 7. The glass template can be reused many times....

Embodiment 3

[0044] 1. Preparation of textured glass template: (1) Configure redox mixed liquid, including: 50g HNO 3 [68%], 30gHF[55%], CH 3 COOH 30 g, 0.6gBr 2 (2) Put the glass in the liquid, soak for 2 hours at room temperature, and take it out; (3) Wash the surface with water, (4) Dry the textured glass surface;

[0045] 2. Use 35% PTFE emulsion (Zhejiang Juhua) to brush or roll on the textured side of the glass plate;

[0046] 3. Dry the ground glass with PTFE emulsion at 100°C for 30 minutes;

[0047] 4. Put the dry glass plate with PTFE film into an oven at 300℃ to cure for 40 minutes;

[0048] 5. Slowly lower the temperature to 100°C and take out the cured glass plate;

[0049] 6. Gently pull out the PTFE film at a temperature of 50°C to obtain a super-hydrophobic PTFE film on one side with a static contact angle of 163 degrees and a rolling angle of 6 degrees;

[0050] 7. The glass template can be reused many times.

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Abstract

The invention discloses a method for producing super-hydrophobic polytetrafluoroethylene films through a glass template process. The method is characterized by producing a ground glass template with roughness of 1.5-10 microns by using a laser etching process, a plasma etching process or an oxidation-reduction process, coating one ground surface of the ground glass template with a 5-35% polytetrafluoroethylene emulsion, drying, curing and tearing off a film when the temperature is reduced to 10-50 DEG C. Through the adoption of the micron-scale ground glass template, the polytetrafluoroethylene films with nanoscale super-hydrophobic surface microstructures can be produced by using internal stress generated on the surfaces of the polytetrafluoroethylene films during curing; the template is free of abrasion; the problems that the adhesion between the stamped template and the polymer film is serious and the reutilization rate of the template is low in the template stamping technology are solved; larger-area nanoscale super-hydrophobic films can be produced; the base thickness can reach 10 microns; the metal surface rust corrosion caused by gas-phase electrochemical reaction is avoided; the production process only comprises drying and curing, is free of emissions and is environmental-friendly.

Description

Technical field [0001] The invention belongs to the technical field of hydrophobic materials, and specifically relates to a method for preparing a super-hydrophobic polytetrafluoroethylene film by a glass template method. Background technique [0002] Super-hydrophobic surface refers to a special surface with a micro-nano-scale structure with a static contact angle greater than 150 degrees and a rolling angle less than 10 degrees. This surface has the basic properties of self-cleaning and anti-fouling, and it is an artificial lotus leaf surface. It can be widely used in a wide range of fields such as electric power, aviation, petrochemical, aviation, wind power, and solar photovoltaic panels. The main solutions are: (1) Self-cleaning function to prevent surface stains and pollution; (2) Anti-corrosion effect: Because of its super-hydrophobicity, it forms an air diaphragm on its surface and water contact surface, so its anti-corrosion performance is improved. [0003] Although som...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L27/18
CPCC08J5/18C08J2327/18C08L27/18C08L2203/16
Inventor 杨得全
Owner 尚蒙科技无锡有限公司
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