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Copolymerized flame-retardant polyamide 66 fiber and preparation method thereof

A flame retardant polyamide and copolymer flame retardant technology, applied in the field of flame retardant polyamide fiber synthesis, can solve problems such as affecting the spinning process of polyamide 66 fibers, limiting the use range of high polymers, and reducing the molecular weight of polymers, and achieves good results. The effect of hand feel and washing resistance, small influence on mechanical properties, and small amount of flame retardant

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

AI Technical Summary

Problems solved by technology

Although the flame retardant modification of copolymerization can achieve a better flame retardant effect, the introduction of flame retardants will inevitably affect the polymerization process of polymer materials, reducing the molecular weight of polymers and affecting the spinning process of polyamide 66 fibers.
In addition, flame retardants are usually randomly distributed in the polymer matrix. For random copolymers, as the concentration of non-crystalline comonomers (flame retardants) increases, the melting point decreases monotonically, that is to say, as the flame retardant With the increase of the additive content, the melting point of the polymer matrix gradually decreases, which limits the scope of use of the polymer.

Method used

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  • Copolymerized flame-retardant polyamide 66 fiber and preparation method thereof
  • Copolymerized flame-retardant polyamide 66 fiber and preparation method thereof
  • Copolymerized flame-retardant polyamide 66 fiber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A preparation method of a copolymerized flame-retardant polyamide 66 fiber, specifically comprising the following steps:

[0037] (1) Mix the flame retardant DDP, hexamethylenediamine with water, mix uniformly at 50°C for 2 hours under nitrogen protection, then stir and react at 90°C for 2 hours, then heat up to 150°C for further polymerization, and finally vacuumize under reduced pressure , after the reaction is completed, a flame retardant prepolymer is formed, which is a viscous liquid with a number average molecular weight Mn of 1.8 × 10 3 , the molar ratio of flame retardant DDP, hexamethylene diamine and water is 1:1.1:2, and both ends of the obtained flame retardant prepolymer are active end groups of a carboxyl group and an amine group respectively;

[0038] The structure of the flame retardant is:

[0039]

[0040] (2) 90 parts by mass of 66 salts and 1 part by mass of adipic acid are made into a 60% aqueous solution, mixed uniformly and added to the autocl...

Embodiment 2

[0048] A preparation method of a copolymerized flame-retardant polyamide 66 fiber, specifically comprising the following steps:

[0049] (1) Mix the flame retardant CEPPA, hexamethylenediamine with water, mix uniformly at 80°C for 3 hours under nitrogen protection, then stir and react at 130°C for 3 hours, then heat up to 180°C for further polymerization, and finally vacuumize under reduced pressure , after the reaction is completed, a flame retardant prepolymer is formed, which is semi-solid and has a number-average molecular weight Mn of 2.5×10 3 , the molar ratio of flame retardant CEPPA, hexamethylene diamine and water is 1:1.2:2.5, and the two ends of the obtained flame retardant prepolymer are respectively a carboxyl group and an amine group active end group;

[0050] The structure of the flame retardant is:

[0051]

[0052] (2) 96.8 parts by mass of 66 salts and 0.2 parts by mass of adipic acid were made into an 80% aqueous solution, mixed uniformly and added to th...

Embodiment 3

[0060] A preparation method of a copolymerized flame-retardant polyamide 66 fiber, specifically comprising the following steps:

[0061] (1) Mix the flame retardant BCPPO and hexamethylenediamine with water, mix uniformly at 60°C for 2.5 hours under nitrogen protection, then stir and react at 95°C for 2 hours, then heat up to 160°C for further polymerization, and finally vacuumize under reduced pressure , the reaction is over to generate a flame retardant prepolymer, which is a viscous liquid with a number-average molecular weight Mn of 2.8×10 3 , the molar ratio of flame retardant BCPPO, hexamethylene diamine and water is 1:1.2:2.1, and the two ends of the obtained flame retardant prepolymer are respectively a carboxyl group and an amine group active end group;

[0062] The structure of the flame retardant is:

[0063]

[0064] (2) 91.8 parts by mass of 66 salts and 0.2 parts by mass of adipic acid were made into a 66% aqueous solution, mixed uniformly and added to the au...

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Abstract

The invention relates to a copolymerized flame-retardant polyamide 66 fiber and a preparation method thereof, especially to a method for preparing the flame-retardant polyamide 66 fiber by preparing a block flame-retardant polyamide 66 copolymer through polymerization of a phosphorus-containing reactive flame retardant, then pelletizing and drying the polyamide 66 copolymer and then carrying out melt 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 reacts with polyamide 66 prepolymer so as to obtain the flame-retardant polyamide 66 copolymer, and finally, the flame-retardant polyamide 66 copolymer is subjected to melt spinning so as to prepare the copolymerized flame-retardant polyamide 66 fiber. The copolymerized flame-retardant polyamide 66 fiber prepared in the invention has excellent mechanical properties, good flame retardation durability and a limit oxygen index of more than 30%. The flame-retardant polyamide 66 fiber can be used for fabricating civil filaments like clothes, carpets, curtains, cloth for furniture, etc. and fabricating industrial filaments like cord fabrics, transport belts, fishing nets, cables, military fabrics, etc.

Description

technical field [0001] The invention belongs to the technical field of flame retardant polyamide fiber synthesis, relates to a copolymerized flame retardant polyamide 66 fiber and a preparation method thereof, in particular to a phosphorus-containing reactive flame retardant prepolymer block copolymerization flame retardant polyamide 66 Fibers and methods of making the same. Background technique [0002] Polyamide fiber is one of the earliest synthetic fibers that have been put into industrial production in the world. As the earliest industrialized variety of synthetic fibers, polyamide 66 fiber has played a pivotal role in both civil and industrial fields due to its good abrasion resistance, moisture absorption, resilience, and dyeability. However, the limiting oxygen index of polyamide 66 fiber is only 21-23%, and its flame retardant performance is poor, which seriously limits its application in various industries. Therefore, the research of flame retardant polyamide 66 f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/80D01F8/12C08G69/42D01D5/08D01D5/12
Inventor 李圆圆肖茹刘可韦俊侃施贻琴王华平
Owner DONGHUA UNIV
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