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High shearing rate method for spinning poly-terephthaloyl p-phenylenediamine fibre

A technology of poly-p-phenylene terephthalamide and poly-p-phenylene terephthalamide, which is applied in the field of spinning poly-p-phenylene terephthalamide fibers at high shear rates, and can solve production efficiency Low, the polymer solution is not easy to form liquid crystal, and the spinning speed is slow, so as to achieve the effect of increasing the spinning rate, shortening the dissolution and defoaming time, and increasing the spinning speed

Active Publication Date: 2006-03-29
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the common shear rate and shear stress, the polymer solution is not easy to form liquid crystal, so the spinning speed is relatively slow (only 80-150 m / min), and the production efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 1.43 kg of dry PPTA resin with an intrinsic viscosity of 6.5dl / g and 3.5 liters of 100% sulfuric acid into a 10-liter mixing cylinder. After mixing for 20 minutes at 85°C, the mixed material is continuously extruded into a 55mm-long In a twin-screw extruder with a diameter ratio of 60 and a rotational speed of 30rpm, the temperature of the twin-screw is controlled at 85°C. The length of the first half of the screw is 1400mm, and the length of the second half is 1900mm. The PPTA resin is completed in the twin-screw. 2 SO 4 After fully dissolving and removing the air bubbles in the spinning solution, after about 50 minutes, apply high shear stress to the spinning solution that is fully mixed, temperature adjusted, and air bubbles are completely removed at the head of the extruder, and after filtration, After metering pump, to 5.5×10 3 the s -1 The shear rate is sent to the spinneret, the spinneret specification is Φ0.08×300 holes, through the 5mm air gap layer, ente...

Embodiment 2

[0024] Add 1.43 kilograms of dry PPTA resin with an intrinsic viscosity of 4.5dl / g and 3.5 liters of 100% sulfuric acid into a 10-liter mixing cylinder. After mixing for 5 minutes at 85°C, the mixed material is continuously extruded into a tube with a diameter of 25 mm and a length of In a twin-screw extruder with a diameter ratio of 30 and a rotational speed of 10rpm, the temperature of the twin-screw is controlled at 50°C. The length of the first half of the screw is 1500mm, and the length of the second half is 1750mm. The PPTA resin is completed in the twin-screw. 2 SO 4 Fully dissolve the air in the spinning solution and remove the air bubbles in the spinning solution. After about 35 minutes, apply high shear stress to the spinning solution that is fully mixed, temperature-regulated, and the bubbles are completely removed at the head of the extruder. After filtering, After metering pump, to 4.5×10 5 the s -1 The shear rate is sent to the spinneret, the spinneret specific...

Embodiment 3

[0026] Add 1.43 kg of dry PPTA resin with an intrinsic viscosity of 8.5dl / g and 3.5 liters of 100% sulfuric acid into a 10-liter mixing cylinder. After mixing for 20 minutes at 85°C, the mixed material is continuously extruded into a diameter of 145mm. In a twin-screw extruder with a diameter ratio of 80 and a rotational speed of 200rpm, the temperature of the twin-screw is controlled at 100°C. The length of the first half of the screw is 1400mm, and the length of the second half is 1900mm. 2 SO 4 After fully dissolving and removing the air bubbles in the spinning solution, after about 3 minutes, apply high shear stress to the spinning solution that is fully mixed, temperature adjusted, and air bubbles are completely removed at the head of the extruder, and after filtration, After metering pump, to 1.0×10 3 the s -1The shear rate is sent to the spinneret, the spinneret specification is Φ0.08×300 holes, through the 5mm air gap layer, enters the coagulation bath spinning tube,...

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Abstract

The invented method includes the following steps: uniformly mixing PPTA and concentrated sulfuric acid whose concentration is greater than 99% in mixing cylinder, preparing mixed solution in which PPTA content is 14%-24%; making the prepared PPTA mixed solution pass through twin screw extruder, further dissolving to form liquid crystal spinning solution, defoaming, fully mixing and regulating temperature, applying high shear stress to the defoamed PPTA spinning slurry in extruder machine head, filtering and metering, adopting dry-jet wet-spinning process to obtain the invented PPTA fibre.

Description

technical field [0001] The invention relates to a method for spinning poly-p-phenylene terephthalamide fibers, in particular to a method for spinning poly-p-phenylene terephthalamide (PPTA) fibers at a high shear rate. Background technique [0002] Polyparaphenylene terephthalamide fiber is a typical aromatic polyamide fiber, also known as para-aramid fiber or PPTA fiber, which has excellent physical and mechanical properties such as high strength and high modulus, high temperature resistance, and small creep. Performance is a type of high-tech fiber with the fastest development speed in the field of fiber materials in recent years. It is mainly used in industrial textiles, especially many products that require lightweight and high performance. Only this kind of fiber can be used. [0003] In the early 1970s, DuPont first disclosed the use of dry jet-wet spinning PPTA / H in patent USP 3,767,756 2 SO 4 Liquid crystal slurry, spun high-strength and high-modulus PPTA fibers, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00D01F6/60
Inventor 刘兆峰胡祖明尤秀兰潘婉莲陈蕾曹煜彤
Owner DONGHUA UNIV
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