Preparation process for composite of rare earth modified carbon-fibre/polytetrafluoroethylene
A technology of polytetrafluoroethylene and composite materials, which is applied in the field of preparation of rare earth modified carbon fiber/polytetrafluoroethylene composite materials, can solve the problems of poor interfacial bonding force, poor processing performance, and large fiber damage of composite materials, and achieve improved interface Good binding force, low cost and good wear resistance
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Embodiment 1
[0023] The raw materials used include: polytetrafluoroethylene, SM021-F type produced by Shanghai Chlor-Alkali Chemical Co., Ltd.; carbon fiber, uncoated polyacrylonitrile-based high-strength type, produced by Jilin Carbon Plant.
[0024] The weight percentages of each component of the rare earth modifier are as follows:
[0025] Lanthanum chloride: 2%, ethanol: 93%, ethylenediaminetetraacetic acid (EDTA): 2%, ammonium chloride: 1%, nitric acid: 0.5%, urea: 1.5%.
[0026] The carbon fiber is pretreated first, and ablated in a muffle furnace at 450°C for 1 hour, so that the residual organic matter on the surface is below 1%. Then, the above-mentioned rare earth modifier was used to treat the carbon fiber in the modifier at room temperature for 2 hours, filtered, and dried.
[0027] The processed carbon fiber is chopped into short fibers of 6 mm, and mixed with the matrix resin by mechanical stirring, the mass percentage of carbon fiber is controlled to be 15% of the mixed powd...
Embodiment 2
[0031] The raw materials used are: polytetrafluoroethylene: SM021-F type produced by Shanghai Chlor-Alkali Chemical Co., Ltd.; carbon fiber: T-300, coated surface treated carbon fiber, produced by Toray Corporation of Japan.
[0032] The weight percentage of each component of the rare earth modifier: 7% of cerium chloride; 76% of ethanol; 9% of ethylenediaminetetraacetic acid (EDTA); 5% of ammonium chloride; 1% of nitric acid; 2% of urea.
[0033] Pre-treat the carbon fiber first, and ablate it in a muffle furnace at 550°C for 0.5 hours, so that the residual organic matter on the surface is below 1%. Then, the above-mentioned rare earth modifier was used to treat the carbon fiber in the modifier at room temperature for 3 hours, filtered, and dried.
[0034] The processed carbon fiber is chopped into short fibers of 10mm, mechanically blended with polytetrafluoroethylene powder, the mass percentage of carbon fiber is 30% of the mixed powder, and then the mixed powder is put int...
Embodiment 3
[0037] The materials are the same as in Example 1, except that the ratio of the rare earth modifier is changed: 10% of lanthanum oxide; 82% of ethanol; 5% of ethylenediaminetetraacetic acid (EDTA); 2% of ammonium chloride; 0.5% of nitric acid;
[0038]The carbon fibers are pretreated first, and ablated in a muffle furnace at 600°C for 0.5 hours, so that the residual organic matter on the surface is below 1%. Then, the above-mentioned rare earth modifier was used to treat the carbon fiber in the modifier at room temperature for 4 hours, filtered, and dried.
[0039] The processed carbon fiber is chopped into short fibers of 15mm, mechanically blended with polytetrafluoroethylene powder, the mass percentage of carbon fiber is 23% of the mixed powder, and then the mixed powder is put into a stainless steel mold for hot pressing , press molding on the press, the pressure is controlled at about 50MPa, and the time is 40 minutes. The process of pressurization and pressure relief is ...
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Abstract
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