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Preparation method of high-strength and low-modulus modified polyamide 56 industrial yarn

A technology of polyamide and industrial yarn, applied in the field of polyamide fiber, which can solve the problems of high technical requirements for fiber production, unguaranteed product stability, and influence on the environment inside the car, so as to improve mechanical properties, reduce entanglement, and improve melt quality. quality effect

Active Publication Date: 2020-09-22
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regulating the molecular chain structure of fibers refers to adding modified monomers or polymers during the polymerization process. For example, the invention patent with application number 201711378602.2 discloses a copolyamide industrial yarn and its preparation method. The initial modulus, but the addition of modified components will inevitably lead to a decrease in melting point and a decrease in strength, which is unfavorable for the manufacture of airbags
It has also been reported to increase flexibility through fabric finishing, but the retention time of product properties obtained by fabric finishing is still a problem, and under high temperature and sunlight conditions, the presence of finishing agents will produce volatile gases, which will affect the car interior environment
The reduction of fibers can significantly improve softness, but the initial modulus does not decrease. At the same time, high-strength and low-denier fibers require high production technology, product stability cannot be guaranteed, and production costs will be higher.

Method used

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  • Preparation method of high-strength and low-modulus modified polyamide 56 industrial yarn

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preparation example Construction

[0043] A preparation method of polyamide 56 industrial yarn for airbag, comprising the following steps:

[0044] 1) Dissolve bio-based pentamethylenediamine in a solvent at 30-80°C to prepare a 30-70wt% amine solution; at the same time, dissolve adipic acid and modified monomers in the same solvent at 30-80°C , prepare an acid solution with an acid mass fraction of 30-70wt%; then add the amine solution into the acid solution under stirring, the molar ratio of amine groups to carboxyl groups is 1-1.002:1, and the temperature is maintained at 50-90 ℃, after stirring continuously for 30-120min, the obtained mixed solution was cooled to 0-20℃, and stood for 2-6 hours, and the precipitated crystals were filtered, washed and dried to obtain the 56 salt. The solvent is one of water, ethanol, methanol and acetonitrile.

[0045] The modified monomer is adipic acid containing branched chain structure, 3-methyl adipic acid, 3-ethyl adipic acid, 3-(1-methylethyl)-adipic acid, 3-tert One...

Embodiment 1

[0059] The first step: the preparation of the 56 salt, the bio-based pentamethylenediamine was dissolved in water at 50°C to prepare an amine solution with a mass fraction of pentamethylenediamine of 40 wt%; at the same time, adipic acid and 3-methylhexyl The diacid is dissolved in water under the condition of 60° C., and is prepared into an acid solution with an acid mass fraction of 45 wt %, wherein the addition of 3-methyladipic acid is 1.5 wt %; then under the action of mechanical stirring , add the amine solution to the acid solution, the addition ratio is 1.001:1 molar ratio of amine group to carboxyl group, keep the temperature at 60°C, keep mechanical stirring for 60min, cool the mixed solution to 5°C, and let it stand for 3 hours, The 56 salt was cooled and crystallized during this process, and finally the 56 salt was obtained after filtration, washing and drying.

[0060] The second step: the 56 salt obtained in the first step is prepared into a 50wt% aqueous solutio...

Embodiment 2

[0064] The first step: the preparation of 56 salt, the bio-based pentamethylenediamine was dissolved in ethanol at 60°C to prepare an amine solution with a mass fraction of pentamethylenediamine of 50wt%; at the same time, adipic acid and 3-ethyl Adipic acid is dissolved in ethanol under the condition of 70° C., and the mass fraction of the acid is prepared into an acid solution with a mass fraction of 55 wt %, wherein the addition of 3-ethyl adipic acid is 3 wt %; Add the amine solution to the acid solution at a ratio of 1:1 molar ratio of amine groups to carboxyl groups, keep the temperature at 70°C, and keep stirring mechanically for 80 minutes, then cool the mixed solution to 5°C and let it stand for 5 hours , 56 salt crystallized during this process, and finally obtained 56 salt by filtering, washing and drying.

[0065] The second step: prepare the 56 salt obtained in the first step into a 55wt% aqueous solution, and add phthalic acid in an amount of 0.1wt%, 4-amino-2,2,...

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Abstract

The invention relates to the field of polyamide fibers, and discloses a preparation method of high-strength and low-modulus modified polyamide 56 industrial yarn. The preparation method comprises stages of salifying, polymerization, spinning, drawing and the like. A modified monomer with the effects of destroying the regularity of molecular chains, reducing the softness of the molecular chains andincreasing the distance between the molecular chains is added into raw materials, so that polyamide 56 is obtained through a melt polymerization and solid or liquid phase viscosity increasing combined mode; and then crystal structures inside the polyamide 56 fibers are regulated and controlled by controlling the processes such as saturated steam bath drawing and hot roller drawing, and the initial modulus of the fibers is reduced while the high strength of the polyamide 56 fibers is maintained.

Description

technical field [0001] The invention relates to the field of polyamide fibers, in particular to a method for preparing high-strength and low-modulus modified polyamide 56 industrial yarns. Background technique [0002] Polyamide 66 fiber has the characteristics of high breaking strength, good wear resistance, good hygroscopicity, elastic recovery rate and fatigue resistance, and is an important fiber variety. With the gradual depletion of non-renewable energy sources, oil prices are constantly fluctuating at high levels, which brings huge risks to polyamide fiber production enterprises. Therefore, more and more people are turning their attention to bio-based materials, among which polyamide 56 The fiber has similar physical and chemical properties to polyamide 66, which can replace the application of polyamide 66 in some fields. [0003] Fabrics for automotive airbags require fibers to have mechanical properties such as high strength, light weight, and good friction propert...

Claims

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Application Information

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IPC IPC(8): D01F6/90D01F1/10D01D5/098D01D10/02C08G69/26C08G69/28
CPCD01F6/90D01F1/10D01D5/098D01D10/02C08G69/26C08G69/28Y02P70/62
Inventor 汤廉王松林徐锦龙
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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