Hot pressing process is an important part of improving the performance of aramid paper-based materials. Temperature and pressure are two important factors affecting the quality of aramid paper. At present, the traditional hot-pressing process is the direct manufacture of paper-made aramid dry paper hot pressing, when the temperature or pressure is too high, the local thermal stress concentration lead to sticky paper roll, paper surface chapped or longitudinal gripping phenomenon, heat Accumulation also leads to the convergence of the molecular chain of aramid fiber, weakening the flexibility of the molecular chain, thereby reducing the elasticity of the aramid paper, elongation and impact resistance, and even local crush and brittle fracture. In addition, the appearance of aramid paper and other properties will also have an impact, such as paper color becomes dark brown, easy to produce static electricity.
Compared to meta-aramid paper, para-aramid paper has a higher specific strength, more resistant to high temperature and easy to moisture, can be used to require more stringent areas. Aramid paper used in high temperature, vibration, reverse strong magnetic field and other environments, the thermal stability of the material and the life of the motor, the use of transformer safety have an important impact. Therefore, it is very important to study the thermal stability and thermal decomposition behavior of para-aramid paper for its development, development and application.
In the field of aramid fiber production, paraformamide fiber development is the fastest, production capacity is mainly concentrated in Japan and the United States, Europe. Such as the United States DuPont Kevlar fiber, the Japanese Teijin's Twaron, Technora fiber, Yantai Taihe new material Taparan (Teplon) fiber. Among them, the United States DuPont, Japan Teijin's production capacity are about 30,000 tons in the para-aramid market in a monopoly position; Yantai Taihe new material in 2011 to achieve the commercial operation of para-aramid, Lun commercial operation in the forefront of the country.
Meta-aramid fiber varieties of the United States DuPont Nomex, Yantai Taihe new material Tametar (Tamida), the Japanese Teijin Conex and so on. The United States DuPont and Yantai Taihe new material is the world's main partner of meta-apex competition, both can produce industrial use of white staple fiber, clothing can be staple fiber, color silk, filament, aramid paper, etc. Performance is relatively close, the degree of differentiation is also comparable, in the environmental protection, safety protection, industrial, electronic appliances, composite materials and other fields launched a wide range of competition.
Aramid paper is made of 100% aramid fiber deep processing of special paper, with high strength and high modulus, low deformation, high temperature, corrosion resistance and a series of excellent performance, is applicable to a variety of areas of high-tech industry paper.
China's strong demand for aramid fiber paper first performance in the field of electrical insulation. Among them, the transformer is currently China's use of aramid insulation paper the most areas. At the same time, China's railway electrification and urban subway, light rail construction is accelerating the pace, including high-power traction transformer, including high-speed trains related equipment put forward higher requirements. The use of aramid paper insulation system of airborne transformers will also usher in an unprecedented opportunity for development.
Aramid paper honeycomb is another important area of China's aramid fiber paper market. As a high-performance lightweight aviation material that has been maturely used in foreign aircraft, the application of aramid paper honeycomb structure in domestic large-scale and high-speed train manufacturing will be higher and higher.