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Manufacturing method of polyamide 56 industrial yarn for airbags

An airbag and polyamide technology, which is applied in the field of polyamide fiber, can solve the problems of unfavorable airbags, product performance retention time, and high production costs.

Active Publication Date: 2020-10-27
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 of application number 201711378602.2 discloses a copolyamide industrial yarn and its preparation method. Initial modulus, but the addition of modified components will inevitably bring about a decrease in melting point and a decrease in strength, which is unfavorable for the manufacture of airbags
On the other hand, there are also reports of increasing 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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  • Manufacturing method of polyamide 56 industrial yarn for airbags
  • Manufacturing method of polyamide 56 industrial yarn for airbags

Examples

Experimental program
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Effect test

preparation example Construction

[0040] A preparation method of polyamide 56 industrial yarn for airbag, comprising the following steps:

[0041] 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 in the same solvent at 30-80°C to prepare an acid The mass fraction of the acid solution is 30-70wt%; then the amine solution is added to the acid solution under stirring, the molar ratio of the amine group to the carboxyl group is 1 to 1.002:1, the temperature is kept at 50-90°C, and the stirring is continued for 30 After -120min, the resulting mixed solution was cooled to 0-20°C and left to stand 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.

[0042] 2) Prepare the obtained 56 salt into a 30-70wt% aqueous solution, add a nucleating agent and an auxiliary agent, and carry out a polymerization reaction: fir...

Embodiment 1

[0056] The first step: the preparation of 56 salts, dissolving bio-based pentamethylenediamine in ethanol at 75°C to prepare an amine solution with a mass fraction of pentamethylenediamine of 67wt%; Dissolve in the same solvent, and prepare an acid solution with an acid mass fraction of 65wt%; then, under the action of mechanical stirring, add the amine solution into the acid solution, keep the temperature at 80°C, and continue mechanical stirring for 65 minutes , the mixed solution was cooled to 11°C, and stood still for 5 hours. During this process, the 56 salt crystallized and precipitated, and finally the 56 salt was obtained after filtration, washing and drying.

[0057] The second step: the 56 salt obtained in the first step is prepared into a 65wt% aqueous solution, and mixed with talcum powder, the addition amount is 1.5wt%, HOOC (CH 2 ) 4 COOH, the addition amount is 0.1wt%, 4-amino-2,2,6,6-tetramethylpiperidine, the addition amount is 0.5wt%, carry out the polymeriz...

Embodiment 2

[0061] The first step: the preparation of the 56 salt, the bio-based pentamethylenediamine was dissolved in water at 60°C to prepare an amine solution with a mass fraction of pentamethylenediamine of 55wt%; at the same time, adipic acid was dissolved at 65°C , dissolved in the same solvent, and prepared into an acid solution with an acid mass fraction of 55wt%; then under the action of mechanical stirring, the amine solution was added to the acid solution, and the temperature was kept at 75°C. After continuous mechanical stirring for 90 minutes, The mixed solution was cooled to 4°C and allowed to stand for 5 hours. During this process, the 56 salt was cooled and crystallized. Finally, the 56 salt was obtained by filtering, washing and drying.

[0062] The second step: the 56 salt obtained in the first step is formulated into a 60wt% aqueous solution, and the nucleating agent is mixed with sodium dihydrogen phosphate, the addition amount is 1.2wt%, and terephthalic acid, the add...

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Abstract

The invention relates to the field of polyamide fibers, and discloses a manufacturing method of polyamide 56 industrial yarn for airbags. The manufacturing method comprises the steps of a salifying stage, a polymerizing stage, a spinning stage, a drafting stage and the like. According to the manufacturing method, a nucleating agent is added, and therefore the grain size of polyamide 56 can be reduced; orientation and crystallization are conducted in sequence through the saturated water vapor bath drafting working procedure, the hot roller drafting working procedure and the like, the grain sizeof the polyamide 56 is controlled through a heat setting technology, polyamide 56 fibers with the high orientation and the low grain size are obtained, and therefore the polyamide 56 industrial yarnwith the high strength and the low modulus is finally obtained. The obtained product can be widely applied to the field of airbags, and the storage performance and the flexibility of the airbags can be improved.

Description

technical field [0001] The invention relates to the field of polyamide fibers, in particular to a preparation method of polyamide 56 industrial yarn for airbags. Background technique [0002] Fabrics for automotive airbags require fibers to have mechanical properties such as high strength, light weight, and good friction properties. At the same time, they also need to have high melting point, high chemical stability, aging resistance, and small folding volume. Polyamide fiber has the characteristics of high breaking strength, wear resistance ranking the top among general textile fibers, good hygroscopicity, elastic recovery rate and fatigue resistance, etc. It is an ideal material for making airbags and has always occupied the vast majority. market share. There are many varieties of polyamide fibers, the main ones are polyamide 6 and polyamide 66 fibers. Considering the high melting point required by airbags for fibers, the commonly used polyamide variety is polyamide 66. ...

Claims

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Application Information

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IPC IPC(8): D01F6/90D01F1/10D01D1/02D01D5/08D01D5/14D01D5/16D01D10/02
CPCD01F6/90D01F1/10D01D5/08D01D5/16D01D5/14D01D10/02D01D1/02Y02P70/62
Inventor 汤廉徐锦龙王松林
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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