Layered composite aramid fiber paper and preparation method thereof

Abstract

The invention provides aramid fiber paper which is composited in a multi-ratio layering manner and a preparation method of the aramid fiber paper. The layered composite aramid fiber paper comprises a surface layer, a core layer and a bottom layer, and is characterized in that the surface layer and the bottom layer are respectively made of following materials: 60 to 90 parts by weight of aramid fiber chopped fibers and 10 to 40 parts by weight of aramid fiber precipitation fibers; the core layer is made of the following materials: 5 to 40 parts by weight of aramid fiber chopped fibers and 60 to 95 parts by weight of aramid fiber precipitation fibers; the aramid fiber chopped fibers are meta-position aramid fibers or para-position aramid fibers with length being 6 to 10mm and fineness being 1 to 3 deniers; the aramid fiber precipitation fibers are irregular fibrous or thin-film fragmented meta-position aramid fibers; the surface layer and the bottom layer account for 40 to 80 percent of the weight of a piece of paper, and the core layer accounts for 20 to 60 percent of the weight of the piece of paper. By adopting the method, the mechanical performance, the insulation performance, the permeability and the specific surface area of a paper sample can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and relates to the papermaking technology of aramid fiber, in particular to the papermaking technology of special synthetic fiber paper. Background technique [0002] Aramid fiber paper is the most critical link in the industry chain of aramid composite materials. It is a kind of high temperature resistant synthetic fiber paper. It is usually made of aramid chopped fiber and aramid precipitated fiber mixed evenly, and then formed on the paper machine. It is made of paper, and then formed by high-temperature calendering. Because of its excellent thermal stability, flame retardancy, chemical stability and insulation properties, and its light weight and outstanding mechanical properties, it can be used as structural materials, motors, etc. Sheet insulation materials, heat insulation materials, packaging materials, honeycomb materials, etc., are widely used in aerospace, electronic transportation...

AI Technical Summary

Problems solved by technology

The patent adopts multi-layer wet papermaking and then composite molding, which effectively improves the mechanical strength and insulation performance of the paper. However, due to the high content of precipitated fibers and high density of the surface layer and the bottom layer, the air permeability is poor and the specific surface area of ​​the paper sample is reduced. In the process of calendering, there are also phenomena that are not conducive to processing, such as foaming and sticking to the roll.

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