Carbon fiber surface silica dioxide coating preparation method
A silica and carbon fiber technology, applied in fiber processing, plant fibers, textiles and papermaking, etc., can solve the problems of complex equipment, high control process requirements, carbon fiber surface damage, etc., and achieve the effect of smooth and smooth coating
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example 1
[0016] Example 1: Get 208g of tetraethyl orthosilicate, 36g of water, 244g of isopropanol, 10g of glycerin, add hydrochloric acid to make the solution pH=3, after stirring for 2 hours, add 36g of PVA (polyvinyl alcohol) aqueous solution with a mass fraction of 5% , and continue stirring for 1 hour. After the stirring is completed, filter with filter paper to obtain a silicon dioxide precursor solution. The carbon fiber is produced by Jilin Carbon Plant, with a diameter of 6-8μm, and each bundle of carbon fiber has 1000 monofilaments.
[0017] The carbon fiber bundles were soaked in acetone for 2 minutes, rinsed with deionized water and dried, then impregnated with the above-mentioned silica precursor solution for 10 minutes, and the impregnation process was 40 kHz ultrasonic vibration. After taking out the cellulose bundle, dry it at room temperature for 10 minutes, raise the temperature to 200°C at a rate of 4°C per minute, then keep the temperature for 30 minutes, then rais...
example 2
[0018] Example 2: Carbon fiber is the same as Example 1.
[0019] Take 208 g of tetraethyl orthosilicate, 27 g of water, 460 g of ethanol, and 15 g of glycerol, add hydrochloric acid to make the solution pH=2, stir for 2 hours, add 27 g of 5% PVA (polyvinyl alcohol) aqueous solution, and continue stirring for 1 hour . After the stirring is completed, filter with filter paper to obtain a silicon dioxide precursor solution.
[0020] After the carbon fiber bundle was soaked in acetone for 2 minutes, rinsed with deionized water and dried, it was impregnated with the above silica precursor solution for 60 minutes. After taking out the cellulose bundle, dry it at room temperature for 10 minutes, raise the temperature to 180°C at a rate of 4°C per minute, then keep the temperature for 30 minutes, then raise the temperature to 500°C at a rate of 4°C per minute, keep the temperature for 60 minutes, and then cool it naturally. carried out under the protection of argon. The obtained c...
example 3
[0021] Example 3: The silicon dioxide precursor solution is the same as Example 2. Carbon fiber is the same as example 1.
[0022] The carbon fiber bundle is degummed by high-temperature burning, rinsed with deionized water and dried, soaked in 10% (volume concentration) nitric acid for 20 minutes for surface oxidation etching, and impregnated with the above-mentioned silica precursor solution for 30 minutes. The process uses 40kHz ultrasonic vibration. After taking out the cellulose bundle, dry it at room temperature for 10 minutes, raise the temperature to 150°C at a rate of 4°C per minute, then keep the temperature for 60 minutes, then raise the temperature to 450°C at a rate of 4°C per minute, keep the temperature for 60 minutes, and then cool it naturally. carried out under the protection of argon. The obtained carbon fiber with silica coating has a flat and smooth coating on the surface of the monofilament, and its thickness is about 0.3 μm. The thermal oxidation temp...
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