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Production method of high-strength high-modulus PMIA super-short fiber

An ultra-short fiber, high-strength and high-modulus technology, applied in the direction of wet spinning, single-component polyamide rayon, etc., can solve the problems of unsatisfactory strength and modulus of aramid paper, and achieve high strength and modulus. Effect

Active Publication Date: 2010-06-16
YANTAI TAYHO ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Meta-aramid ultra-short fiber is one of the main raw materials used in the production of aramid paper, and has wide application prospects. The strength and modulus of aramid paper produced by ordinary meta-aramid ultra-short fiber are not ideal

Method used

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  • Production method of high-strength high-modulus PMIA super-short fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. Carry out solution polymerization with monomeric isophthaloyl chloride (IPC) and monomeric m-phenylenediamine (MPDA) in the solution of dimethylacetamide, and use calcium hydroxide to neutralize the hydrochloric acid generated by the reaction to obtain spinning silk stock solution;

[0014] The spinning solution used before wet spinning is a low-salt spinning solution. When carrying out the polymerization reaction, isophthaloyl chloride is added once for neutralization. By controlling the amount of isophthaloyl chloride added and adding a suitable terminator, the The inherent viscosity of the spinning dope is 4.3-4.6.

[0015] 2. Wet spinning: After degassing, the spinning stock solution is extruded through a spinneret hole with a diameter of 0.01-2 mm, and the filament is formed through an aqueous solution at a temperature of 20 ° C, and passed through a special drafting machine in a In an aqueous solution containing calcium chloride, draw twice to make it have goo...

Embodiment 2

[0019] 1. In the solution of dimethylformamide, use monomer isophthaloyl chloride (IPC) and monomer m-phenylenediamine (MPDA) to carry out solution polymerization, and use calcium oxide to neutralize the hydrochloric acid generated by the reaction to obtain spinning Stock solution; The logarithmic viscosity of the spinning stock solution is 4.6-4.9.

[0020] 2. Wet spinning: After degassing, the spinning stock solution is re-extruded through a spinneret hole with a diameter of 0.01-2 mm, and a filament is formed through an aqueous solution at a temperature of 40 ° C, and passed through a special drafting machine in a In an aqueous solution containing calcium chloride, the draft is 6 times to make it have good mechanical properties, and the fiber is washed and dried;

[0021] 3. Heat treatment at 400°C on the dried product;

[0022] 4. After heat treatment, the fibers are wound into high-strength and high-modulus meta-aramid filament bundles, and then cut with a special cuttin...

Embodiment 3

[0024] 1. Carry out solution polymerization with monomeric isophthaloyl chloride (IPC) and monomeric m-phenylenediamine (MPDA) in the solution of dimethylacetamide, and use calcium hydroxide to neutralize the hydrochloric acid generated by the reaction to obtain spinning Silk stock solution; the logarithmic viscosity of the spinning stock solution is 5.4-5.7.

[0025] 2. Wet spinning: After degassing, the spinning stock solution is re-extruded through a spinneret hole with a diameter of 0.01-2 mm, and a filament is formed through an aqueous solution at a temperature of 50 ° C, and passed through a special drafting machine in a In an aqueous solution containing calcium chloride, draw 10 times to make it have good mechanical properties, wash and dry the fiber;

[0026] 3. Heat treatment at 450°C on the dried product to further improve the mechanical properties of the fiber;

[0027] 4. After heat treatment, the fibers are wound into high-strength and high-modulus meta-aramid fi...

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Abstract

The invention discloses a preparation method of high-strength high-modulus PMIA super-short fiber, comprising: m-phthaloyl chloride and metaphenylene diamine are adopted in a system of which the sulphonamide compound is an organic solvent to polymerize solution to obtain m-phenyleneisophthalamide (PMIA) solution comprising polymetaphenylene isophthamide as a repeating unit; performing neutralization reaction by calcium oxide or calcium hydroxide to generate hydrochloric acid so as to obtain spinning solution, wherein the logarithmic viscosity number of the spinning solution is 3-6; high-strength high-modulus PMIA super-short fiber of which the length is 0.5-20 mm is prepared by wet spinning, cleaning, heat treatment, winding, cutting off and packaging. The strength and the modulus of the PMIA super-short fiber are greatly improved compared with the existing like products.

Description

technical field [0001] The invention belongs to the field of aramid fiber preparation, in particular to a method for preparing high-strength and high-modulus meta-aramid ultra-short fibers. Background technique [0002] Aramid fiber (Aramid fiber) is a new type of high-tech synthetic fiber, mainly divided into two types, para-aramid fiber (PPTA) and meta-aramid fiber (PMIA), with ultra-high strength, high modulus and durability High temperature, acid and alkali resistance, light weight and other excellent properties, its strength is 5 to 6 times that of steel wire, its modulus is 2 to 3 times that of steel wire or glass fiber, its toughness is 2 times that of steel wire, and its weight is only 1 / of that of steel wire. About 5, at a temperature of 560 ° C, it will not decompose or melt. It has good insulation and anti-aging performance, and has a long life cycle. The discovery of aramid fiber is considered to be a very important historical process in the material industry....

Claims

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Application Information

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IPC IPC(8): D01F6/60C08G69/32D01D5/06
Inventor 宋翠艳宋西全王寅超王学高东
Owner YANTAI TAYHO ADVANCED MATERIALS CO LTD
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