A kind of preparation method of aramid pulp and the prepared aramid pulp

Abstract

The invention relates to the field of organic fiber and its preparation, in particular to a preparation method of aramid pulp. The preparation method comprises the main steps that aramid fiber is sequentially subjected to corona treatment, humidification treatment, high-speed rotary pulverizer dry-method pulping and other technological processes. The method is short in technological process, low in energy consumption and harmless to the environment and does not adopt solvents and other organic materials, the obtained product is pure and free of impurity contaminations, the average length of the aramid pulp is 0.5-1.5 mm, the specific surface area is 5-12 g / m<2>, the fibrillation degree is high, hairiness is rich, and the preparation method is suitable for the fields such as sealing materials.

Description

technical field [0001] The invention relates to the field of organic fiber and its preparation, in particular to a fiber pulp and its preparation method. Background technique [0002] Aramid pulp is a product of surface fibrillation of aramid fibers. It is fluffy and rich in hairiness. It has high strength, good dimensional stability, high temperature resistance, corrosion resistance, strong toughness, small shrinkage, and wear resistance. Good, large specific surface area and other characteristics, can be used in aramid paper, friction materials, sealing materials and other fields. [0003] At present, the preparation method of aramid pulp is mainly the wet refining method, and its technical route is to cut the aramid filament into the required length, disperse it in a specific medium solution, form a fiber suspension, and then pass through , refining, sieving, filtering, drying, opening and other process steps to obtain the finished product of aramid pulp. This method no...

AI Technical Summary

Problems solved by technology

This method not only has a long process flow, high energy consumption and high production cost, but also when the fiber suspension passes through the metal grinding disc of the wet refiner and is divided into filaments, the metal grinding discs in the refiner directly grind and contact each other. , a small amount of metal debris will be mixed in the product, affecting product performance

[0004] Patent CN 106087411 A discloses a method for preparing modified aramid pulp, which belongs to the dry pulping process, and its technical route is to subject aramid chopped fibers to steam explosion treatment and ionic liquid spray treatment in sequence, Then add jet mill for fibrillation, this method shortens the technological process to a certain extent, but its disadvantages are also obvious: 1. The obtained product is aramid pulp modified by ionic liquid, and the product is not pure, which affects its practical application ; 2. The average length of the obtained modified aramid pulp is 5 mm to 8 mm, and shorter aramid pulp cannot be obtained, which cannot meet the application requirements in fields such as sealing materials

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