Short carbon fiber-staple glass fiber hybrid reinforced rubber-based sealing composite material and preparation technique thereof

Abstract

The invention relates to a reinforced rubber based sealing composite materials and the preparation technology, in particular to a short carbon fiber-glass short fiber carbon fiber assorted reinforced rubber based sealing composite materials and the preparation technology. The invention adopts the assorted fiber of short carbon fiber-glass short fiber carbon fiber as the reinforcing fiber to optimize the formula of high temperature resistant NAFC materials on the basis of research of carbon fiber surface processing technology, and optimize the technological parameters of material rolling and sheet-shaping and forming to develop a new type NAFC material; the long term usage temperature can reach 350 DEG C within a year and the long term usage temperature reaches above 250 DEG C within three years which is expected to be used to replace asbestos rubber plate under severe working conditions.

Description

Technical field [0001] The invention relates to a reinforced rubber-based sealing composite material and a preparation process thereof, in particular to a short carbon fiber-glass short fiber hybrid reinforced rubber-based sealing composite material and a preparation process thereof. Background technique [0002] For more than 100 years, asbestos rubber sheet (CAF) has become the most widely used sealing gasket in the process industry due to its good elasticity, heat resistance, creep relaxation resistance, chemical corrosion resistance and high mechanical strength. Material. However, since the 1970s, a large number of studies have shown that asbestos is a strong carcinogen. When its products are produced and used, asbestos microfibers with a diameter of less than 3 μm are easily suspended in the air and inhaled by the human body, which is extremely harmful. For the purpose of human health and environmental protection, many developed countries have legislated to prohibit th...

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Problems solved by technology

Since then, the NAFC material developed by Xie Sujiang et al. using the improved compressed asbestos process and aramid pulp reinforcement still has a certain gap in performance compared with similar foreign products, and there is no advantage in price.

In 1998, Xi'an Jiaotong University mainly used aramid fibers instead of asbestos fibers to develop NAFC materials, but there was also the problem of low cost performance.

From 2001 to 2004, the Fluid Sealing and Measurement and Control Technology Research Office of Nanjing University of Technology successively developed aramid fiber and aramid fiber / pre-oxidized silk reinforced NAFC materials by molding method, and made certain breakthroughs. The developed aramid fiber / pre-oxidized silk The short-term maximum service temperature of hybrid reinforced NAFC materials reached 250°C; from 2005 to 2006, the research laboratory conducted experimental research on the improved calendering process of NAFC sheets, and developed aramid pulp-short glass fiber reinforced NAFC materials. And according to the thermal weight loss rate of the material, it is predicted that its long-term service temperature within one year will reach 300°C. Although it meets the needs of general engineering practice, it still cannot fully meet the requirements of the petrochemical industry for the life of non-metallic gaskets at high temperatures (above 200°C). 3+ years required

Among the commonly used substitute asbestos fibers, slag wool has good tensile strength, oil resistance, and solvent resistance, but its service temperature is not high; glass fiber has high tensile strength and elastic modulus, and heat resistance (softening temperature (550~850℃), solvent resistance, chemical corrosion resistance and dimensional stability are all outstanding, and the price is low, but its brittleness is relatively large, processing performance and adhesion to rubber are poor; aramid fiber has very good High strength, no brittleness, resistance to almost various chemical solvents and drugs, but the price is high, and the long-term use temperature does not exceed 200 ° C; carbon fiber has excellent high temperature resistance (carbon fiber can be used in non-oxidizing media at 1000 ° C fashion Keep stable) and dimensional stability, high specific strength, high modulus, and has the best chemical corrosion resistance, organic solvent resistance and self-lubrication, is an excellent high temperature resistant NAFC material reinforced fiber

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