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

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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 applic

Method used

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

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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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