High-elongation low-modulus para-aramid fiber and preparation method thereof

A para-aramid fiber, low modulus technology, applied in fiber chemical characteristics, dry spinning, wet spinning, etc., can solve the problems of low production capacity, stable production that has not yet been achieved in batches, high elongation, etc.

Inactive Publication Date: 2021-04-23
YANTAI TAYHO ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the stable production of para-aramid fibers with high elongation and low modulus material properties has not yet been realized in batches
Aiming at the problem of low production capacity due to insufficient development of high-elongation and low-modulus para-aramid fiber technology, a method was developed to solve the unstable control of fiber elongation and modulus in the traditional dry-jet wet spinning process. The process method is an important problem that technicians need to solve urgently

Method used

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  • High-elongation low-modulus para-aramid fiber and preparation method thereof

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preparation example Construction

[0034] The invention discloses a preparation method of high-elongation and low-modulus para-aramid fibers, which comprises the following steps:

[0035] (a) Using concentrated sulfuric acid as a solvent, the poly-p-phenylene terephthalamide (PPTA) raw material is formulated into a polymer mixed solution with a mass percentage of 15% to 20%, and the dissolution time is 1 to 4 hours, and then Stand still under vacuum for 2-6 hours for defoaming to obtain spinning solution;

[0036] (b) The spinning solution is extruded and pushed under a pressure above 5MPa. After filtering, it passes through a spinneret with a pore size of 0.080mm. fiber;

[0037] Preferably, the pressure of extrusion is 5-20 MPa.

[0038] Preferably, the high-elongation low-modulus para-aramid fiber preparation step (a) of the PPTA raw material has a viscosity-average molecular weight of 40,000 to 49,000 and an intrinsic viscosity of 6.0 to 7.5 dL / g;

[0039] Wherein, the PPTA raw material is prepared through...

Embodiment 1

[0053] A preparation method of high-elongation low-modulus para-aramid fiber, comprising the steps of:

[0054] (1) Add anhydrous calcium chloride and N-methylpyrrolidone (NMP) into the reactor at a weight ratio of 4:100, then add an appropriate amount of p-phenylenediamine (PPD), and stir at room temperature for 30 minutes;

[0055] (2) The jacket of the reactor is cooled by a refrigerant to lower the temperature of the system to -15° C., add the first batch of terephthaloyl chloride (TPC) which is 20% of the total amount, and continue to stir for 30 minutes;

[0056] (3) Make the temperature of the system drop to -15°C again, add the second batch of TPC which is 80% of the total amount, and stir rapidly. After the reaction system appears gel, climbs rods, and is crushed again, stop the reaction to obtain PPTA , wherein the total molar ratio of adding PPD in step (1) and TPC added in two batches in steps (2) and (3) is 1:1. Finally, the obtained viscosity-average molecular w...

Embodiment 2

[0060] A preparation method of high-elongation low-modulus para-aramid fiber, comprising the steps of:

[0061] (1) Add anhydrous calcium chloride and N-methylpyrrolidone (NMP) into the reactor in a ratio of 20:100 by weight, then add an appropriate amount of p-phenylenediamine (PPD), and stir at room temperature for 30 minutes;

[0062] (2) The jacket of the reactor is cooled by cooling medium, so that the temperature of the system drops to 0° C., and the first batch of terephthaloyl chloride (TPC) which is 40% of the total amount is added, and the stirring is continued for 30 minutes;

[0063] (3) Make the temperature of the system drop to 0°C again, add the second batch of TPC which is 60% of the total amount, and stir rapidly. After the reaction system appears gel, climbs rods, and is crushed again, stop the reaction to obtain PPTA. Wherein the total molar ratio of adding PPD in step (1) and adding TPC in two batches in steps (2) and (3) is 1:1.05. Finally, the obtained v...

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Abstract

The invention discloses a high-elongation low-modulus para-aramid fiber and a preparation method thereof, and belongs to the field of aramid fibers and preparation methods thereof. Low-temperature solution polycondensation and dry-jet wet spinning processes are adopted, so that the problem of non-uniform distribution of polymerization molecular weight is mainly solved, and the distribution of the polymerization molecular weight in a narrower range is realized; a para-aramid spinning process is designed and optimized and a coagulating bath temperature process is set to realize production continuity, and parameters such as fiber orientation degree, nascent fiber mechanical property and the like are controlled to optimize a production process; process setting of temperature in post-treatment processes such as para-aramid washing and drying is carried out, fiber crystallization parameters in a fiber stretching process are controlled, and product performance is improved. The para-aramid fiber obtained based on the preparation method has the elongation at break of greater than or equal to 3.5%, the initial elastic modulus of 80-88 Gpa and the breaking strength of greater than or equal to 20.5 cN/dtex, and meets the application requirements of para-aramid in the fields of automobile rubber tubes, tires and conveyor belts.

Description

technical field [0001] The invention belongs to the field of aramid fiber and its preparation method, and relates to a high-elongation and low-modulus para-aramid fiber and its preparation method. Background technique [0002] The full name of para-aramid is polyparaphenylene terephthalamide (PPTA), which is a kind of organic synthetic fiber with high strength and high modulus. It is widely used in bulletproof, tires, rubber products (automotive hoses and conveyor belts), Important fields such as outdoor optical cables and advanced composite materials are important basic materials for the construction of aerospace, national defense and military industries. The reinforcing materials used in the traditional rubber hose, tire, and conveyor belt manufacturing industries include steel wire, polyester, rayon, and nylon. These reinforced materials are no longer able to meet the requirements of the product to withstand higher pressure and temperature, as well as the harsh working e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/04D01D5/06D01D10/02D01F6/60C08G69/32
CPCC08G69/32D01D5/04D01D5/06D01D10/02D01F6/605
Inventor 高殿飞马千里邱召明杜志林孙宇孙德卫尚晴
Owner YANTAI TAYHO ADVANCED MATERIALS CO LTD
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