Preparation method of defoaming agent in carbon fiber sizing technology and sizing method

Abstract

The invention provides a preparation method of a defoaming agent in a carbon fiber sizing technology and a sizing method. Dimethicone, acetone or butanone and a non-ionic surface active agent are mixed and stirred evenly, a water bath is increased in temperature, deionized water is added, stirring is continued until viscosity tends to be stable, and cooling and filtering are performed. The defoaming agent is added to form a mixed solution, and accounts for 2-5%o of the total mass of a sizing agent in a carbon fiber sizing tank, the mixing solution is mixed evenly under driving of a circulatingpump, the web of carbon fibers is expanded to be 2-8 times the width of original filament bundles, the carbon fibers pass through the sizing tank at the dipping speed of 0.5-4 m / min and tension of 50g-400 g, dehydration is performed in a drying channel of 120 DEG C-180 DEG C, and carbon fiber finished products are formed by rolling through a filament collecting device. The non-ionic defoaming agent obtained through the method has the advantages of being small in particle size, narrow in distribution, high in stability and environmentally friendly. With the sizing technology, the tensile strength of carbon fiber filaments can be improved, and the interlamination shearing strength of a carbon fiber composite material can be further improved.

Description

technical field [0001] The invention relates to a method for preparing a defoamer, in particular to a method for preparing a defoamer used in a carbon fiber sizing process, and the invention also relates to a carbon fiber sizing method. Background technique [0002] Carbon fiber is an inorganic polymer fiber with a carbon content higher than 90%. It has high axial strength and modulus, no creep, good fatigue resistance, thermal conductivity and electrical conductivity between non-metal and metal, and has excellent fineness. , and a series of excellent properties such as high temperature resistance, corrosion resistance, electrical conductivity, and small expansion coefficient. Because of its excellent performance of high strength, high modulus and light weight, it not only has an irreplaceable position in aerospace, shipbuilding and other fields, but also has an irreplaceable position in automobile transportation, building protection, wind power generation, medical equipment...

AI Technical Summary

Problems solved by technology

[0006] During the sizing process, the circulating flow of the sizing agent in the sizing tank and the rotation of the sizing roller will generate a large number of air bubbles, which will adhere to the surface of the carbon fiber, causing defects in the polymer protective layer on the surface of the carbon fiber, and seriously reducing the overall performance of the carbon fiber.

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