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Preparation method of para fanglun slurry cake

A para-aramid pulp and slurry technology, applied in textiles and papermaking, fiber processing, filament/thread forming, etc., can solve the problems of poor comprehensive physical and mechanical properties, low intrinsic viscosity of aramid pulp, long process flow, etc. problems, to achieve the effect of reducing pollution, good physical and mechanical properties, and high viscosity

Inactive Publication Date: 2004-02-18
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This spinning and cutting preparation method not only needs to prepare the polymer spinning solution, but also needs to perform spinning forming, winding and cutting processes, etc. The process is long, requires special cutting equipment, and is expensive.
[0003] CN 1030779 adopts non-spinning method and direct polycondensation fiber-forming method to prepare aramid pulp, and adds some diamine third monomers instead of tertiary amine acid absorbents in the reaction system, which improves the operating environment. However, the prepared para-aramid pulp has low intrinsic viscosity and poor comprehensive physical and mechanical properties.

Method used

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  • Preparation method of para fanglun slurry cake
  • Preparation method of para fanglun slurry cake

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preparation example Construction

[0009] A method for preparing para-aramid pulp, comprising completely dissolving terephthalamide p-phenylene diamide resin in concentrated sulfuric acid with a concentration of 95%-101% to form a slurry, adding the slurry to a coagulation solution, and undergoing intense After stirring, the pulp-like fibers of p-phenylene terephthalamide are directly precipitated, washed and dried to obtain para-aramid pulp. The intrinsic viscosity of the said p-phenylene terephthalamide resin is 2.5-7.5 dl / g. Preferably, the intrinsic viscosity of the p-phenylene terephthalamide resin is 3.5-6.5 dl / g. In the slurry, the concentration of p-phenylene terephthalamide resin is 1%-15%. In the slurry, the concentration of p-phenylene terephthalamide resin is 3% to 8%.

[0010] The coagulation liquid is amide solvent or concentrated sulfuric acid or glycerin or acetic acid with a concentration of 60-85%.

[0011] The amide solvent is an aqueous solution or ethanol solution of N-methylpyrrolidone,...

example 1

[0013] Example 1. the aramid fiber 1414 resin (chemical name: terephthalamide p-phenylenediamine resin) that intrinsic viscosity is 3.5dl / g, in 100% concentrated sulfuric acid, dissolve completely and be formulated with the slurry that concentration is 5%, In 100% acetic acid solution at 20°C, at a stirring rate of 1500 rpm, the slurry rapidly precipitates into pulp-like fibers with a certain length-to-diameter ratio and a large specific surface area, and continues stirring for 2 minutes to wash the precipitate , suction filtration, and drying to obtain para-aramid pulp with rich surface hairiness, the average length is 2mm, and the aspect ratio is about 60-80.

example 2

[0014] Example 2. The aramid fiber 1414 resin that the intrinsic viscosity is 5.1dl / g is completely dissolved in 100% concentrated sulfuric acid and is formulated into a 4% slurry, and the slurry contains 50% glycerin in an aqueous solution at 30°C at 2000 rpm Rapidly precipitate into a pulp shape at a certain stirring rate, continue to stir for 2 minutes, wash the precipitate, filter with suction, and dry to obtain para-aramid pulp with rich surface hairiness, the average length is 2.5-3.5mm, and the aspect ratio It is about 80-90.

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Abstract

A p-aramid fibre pulp is prepared through dissolving the resin "1414" of aramid fibre with a certain characteristic viscosity in concentrated sulfuric acid and high-speed stirring to deposit it. Differential p-aramid fibre pulp can be obtained according to differential use.

Description

technical field [0001] The invention relates to a preparation method of para-aramid pulp. Background technique [0002] US3869430 proposes to use terephthalamide concentrated sulfuric acid liquid crystal solution to spin to prepare PPTA filaments, which are chopped into 20mm long short fibers by special cutting equipment, and then fibrillated and knocked to make the surface of the fibers change. Rough, feathering forms aramid pulp. In addition to the preparation of polymer spinning solution, this spinning and cutting preparation method also needs processes such as spinning forming, winding and cutting. The process is long, requires special cutting equipment, and is expensive. [0003] CN 1030779 adopts non-spinning method and direct polycondensation fiber-forming method to prepare aramid pulp, and adds some diamine third monomers instead of tertiary amine acid absorbents in the reaction system, which improves the operating environment. However, the obtained para-aramid pul...

Claims

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Application Information

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IPC IPC(8): C08J3/02D01D5/40
Inventor 刘兆峰胡祖明吴清基尤秀兰于俊荣陈蕾傅群
Owner DONGHUA UNIV
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