Flame-retardant polyamide 6 composite fiber and preparation method thereof

A flame-retardant polyamide and composite fiber technology, which is applied in the direction of conjugated synthetic polymer artificial filaments, etc., can solve the problems of monotonous melting point and other problems, and achieve good flame-retardant effect, less flame-retardant addition, and long-lasting flame-retardant effect Effect

Inactive Publication Date: 2015-12-16
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are also shortcomings in the flame retardant modification of copolymerization. Usually, the flame retardant modification of copolymerization is to directly polymerize the monomers of the flame retardant and the polyamide to obtain a random copolymer of the polyamide and the flame retardant. The flame retardant is an important component in the polyamide. Randomly distributed, for random copolymers, as the content of non-crystalline comonomer (flame retardant) increases, the melting point decreases monotonically. 6 fiber, but also need to maintain the high temperature performance of polyamide 6 fiber, which limits the use of polyamide 6 fiber

Method used

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  • Flame-retardant polyamide 6 composite fiber and preparation method thereof
  • Flame-retardant polyamide 6 composite fiber and preparation method thereof
  • Flame-retardant polyamide 6 composite fiber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A preparation method of flame-retardant polyamide 6 composite fiber, specifically comprising the following steps:

[0050] (1) Mix the flame retardant DDP, hexamethylenediamine and water, mix evenly at 50°C for 2 hours under the protection of nitrogen, then stir and react at 90°C for 2 hours, then raise the temperature to 150°C for further polymerization, and finally decompress and vacuumize, and react Finish generating flame retardant prepolymer, it is viscous liquid, number average molecular weight Mn is 1.8×10 3 , the molar ratio of flame retardant DDP, hexamethylenediamine and water is 1:1.1:2, and the two ends of the obtained flame retardant prepolymer are active end groups of carboxyl and amine groups respectively;

[0051] The structure of the flame retardant is:

[0052]

[0053] (2) 90.7 parts by mass of caprolactam, 4.0 parts by mass of water and 0.3 parts by mass of adipic acid are added to the reactor, and N 2 Exhaust the air in the kettle, stir at a sp...

Embodiment 2

[0062] A preparation method of flame-retardant polyamide 6 composite fiber, specifically comprising the following steps:

[0063] (1) Mix the flame retardant CEPPA, hexamethylenediamine and water, mix evenly at 80°C for 3 hours under the protection of nitrogen, then stir and react at 130°C for 3 hours, then raise the temperature to 180°C for further polymerization, and finally decompress and vacuumize, react Finish generating flame retardant prepolymer, it is semi-solid, number average molecular weight Mn is 2.5 * 10 3 , the molar ratio of flame retardant CEPPA, hexamethylenediamine and water is 1:1.2:2.5, and the two ends of the obtained flame retardant prepolymer are active end groups of carboxyl and amine groups respectively;

[0064] The structure of the flame retardant is:

[0065]

[0066] (2) 88.5 parts by mass of caprolactam, 1.5 parts by mass of water and 0.5 parts by mass of adipic acid are added to the reactor, and N 2 Exhaust the air in the kettle, stir at a s...

Embodiment 3

[0075] A preparation method of flame-retardant polyamide 6 composite fiber, specifically comprising the following steps:

[0076] (1) Mix the flame retardant BCPPO, hexamethylenediamine and water, mix evenly at 60°C for 2.5 hours under the protection of nitrogen, then stir and react at 95°C for 2 hours, then raise the temperature to 160°C for further polymerization, and finally vacuumize under reduced pressure, At the end of the reaction, a flame retardant prepolymer is generated, which is a viscous liquid with a number average molecular weight Mn of 2.8×10 3 , the molar ratio of flame retardant BCPPO, hexamethylenediamine and water is 1:1.2:2.1, and the two ends of the obtained flame retardant prepolymer are active end groups of carboxyl and amine groups respectively;

[0077] The structure of the flame retardant is:

[0078]

[0079](2) 92.9 parts by mass of caprolactam, 0.8 parts by mass of water and 0.8 parts by mass of adipic acid are added to the reactor, and N 2 Ex...

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Abstract

The invention relates to a flame-retardant polyamide 6 composite fiber and a preparation method thereof, especially to a method for preparing the flame-retardant polyamide 6 composite fiber by continuously and separately carrying out two-step polymerization on a phosphorus-containing reactive flame retardant to prepare block copolymerized flame-retardant polyamide 6 and then subjecting the block copolymerized flame-retardant polyamide 6 and a fiber forming polymer to melt composite spinning. The method is characterized in that the flame retardant reacts with diamine or dihydric alcohol to produce a flame-retardant prepolymer, then the flame-retardant prepolymer and polyamide 6 prepolymer undergo copolymerization so as to obtain a flame-retardant polyamide 6 material, and finally, after pelletizing of a cast strip, extraction and drying, the flame-retardant polyamide 6 material and the sliced fiber forming polymer are subjected to melt composite spinning so as to prepare the flame-retardant polyamide 6 composite fiber. The flame-retardant polyamide 6 composite fiber prepared by using the method has the characteristics of a small addition amount of the addition, long-lasting flame retardation effect and fluffy and comfortable feel, can be used for preparation of fabric products, and is mainly applicable to knitting wool, blankets, wool fabrics, warm-keeping wadding fillers, silk fabrics, non-woven fabrics, medical and sanitary products, special working clothes, etc.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant polyamide fiber synthesis, and relates to a flame-retardant polyamide 6 composite fiber and a preparation method thereof, in particular to a block-copolymerized fiber containing flame-retardant fiber obtained through continuous two-step polymerization. A flame-retardant polyamide 6 composite fiber of an agent prepolymer and a preparation method thereof. Background technique [0002] Polyamide fiber is called nylon in our country, and it is also called nylon, nylon, capron and so on abroad. As the earliest industrialized variety of synthetic fiber, polyamide 6 fiber has played a pivotal role in civil and industrial fields due to its excellent strength, wear resistance, hygroscopicity, and resilience. However, the limiting oxygen index of polyamide 6 fiber is only about 21%, which belongs to combustible fiber. The research on flame-retardant polyamide 6 composite fiber has become an urgent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/12D01F8/14C08G69/42
Inventor 肖茹刘可李圆圆晏珊王华平王朝生
Owner DONGHUA UNIV
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