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Oiling method of polyacrylonitrile raw silk

A technology of polyacrylonitrile and raw silk, which is applied in filament/thread forming, artificial filament cleaning/drying, textile and papermaking, etc. It can solve the problems of uneven oiling and low oiling rate, and achieve uniform oiling , reduce adhesion, improve the effect of oiling rate of raw silk

Active Publication Date: 2021-06-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] One of the technical problems to be solved by the present invention is the problem of uneven oiling and low oiling rate existing in the prior art. A method for oiling polyacrylonitrile precursors is provided. The oiling method has the advantages of oiling The advantages of uniformity, high oiling rate, good spinning stability and dry and densified rollers without sticking oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Preparation of stock solution: Distilled acrylonitrile (AN) and itaconic acid (IA) in a ratio of 97:3, with a solid content of 20%, and azobisisobutyronitrile (AIBN) accounts for 0.4wt% of the comonomer, Add dimethyl sulfoxide (DMSO) as a solvent into the reactor, and react at a constant temperature of 59° C. for 20 hours under the protection of nitrogen to obtain a binary acrylonitrile copolymer spinning solution. Then the spinning solution is decompressed to remove residual monomers and air bubbles, and then filtered through a 5 μm filter material to obtain an acrylonitrile copolymer spinning solution. After testing, the molecular weight is 80021, the molecular weight distribution is 3.34, and the viscosity is 75 Pa·s at 60°C.

[0034] 2. Coagulation forming: The spinning dope is metered by a metering pump, filtered again at 3 μm, extruded through a spinneret and then enters the first coagulation bath. The temperature of the coagulation bath is 20°C, the concentrat...

Embodiment 2

[0042] The polyacrylonitrile raw silk from water washing enters the first oiling process, the mass concentration of the oiling agent in the first oiling process is 1.5%, the temperature is normal temperature, and the excess oiling agent is squeezed by the extrusion roller, then enters the first drying and compacting process The temperature is 75°C, the time is 40s, the obtained raw silk is subjected to steam drawing, the pressure of steam drawing is 0.2Mpa, and the draft ratio is 2 times, the obtained raw silk is subjected to steam heat setting, and then the second Second oiling, the mass concentration of the oil agent in the second oiling is 1%, the raw silk leaving the second oiling is squeezed, and then dried and densified in the second layer, the temperature is 100°C, the time for the second oiling After 10s, the final yarn is collected to obtain high-performance polyacrylonitrile raw silk. The pressure of steam heat setting is 0.2Mpa. The polyacrylonitrile raw silk is even...

Embodiment 3

[0044] The polyacrylonitrile raw silk from water washing enters the first oiling process, the mass concentration of the oiling agent in the first oiling process is 2.5%, the temperature is normal temperature, and the excess oiling agent is squeezed by extrusion rollers, and enters the first drying and compacting process The temperature is 85°C, the time is 20s, and then the second oiling is carried out. The mass concentration of the oiling agent in the second oiling is 3%, and the temperature is normal temperature. Secondary drying and densification, the temperature is 110°C, the time is 50s, the obtained raw silk is steam drawn, the pressure of steam drawing is 0.27Mpa, the draft ratio is 2.3 times, and the obtained raw silk is steam heat-set , and then carry out the third stage of oiling, the mass concentration of the third oiling oil agent is 0.8%, the raw silk leaving the third stage of oiling is extruded, then carries out the third stage of drying and densification, the te...

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Abstract

The invention relates to an oiling method for polyacrylonitrile precursors, which mainly solves the problems of uneven oiling and low oiling rate in the prior art. The oiling method by adopting polyacrylonitrile raw silk includes the steps of oiling and drying and densification, steam drawing, and heat setting; it is characterized in that there are at least two steps of oiling and drying and densification, and at least one of them is in The technical solution that is performed before the steam drawing and heat setting steps and at least one after the steam drawing and heat setting steps can better solve this problem and can be used in the spinning process of polyacrylonitrile precursors.

Description

technical field [0001] The invention relates to an oiling method, in particular to an oiling method for polyacrylonitrile precursors. Background technique [0002] Since the 1950s, developed countries have urgently needed new structural materials and corrosion-resistant materials in order to develop large-scale rockets and artificial satellites and comprehensively improve aircraft performance, so that carbon fibers reappeared on the stage of new materials, and gradually formed PAN-based carbon fibers. The three major raw material systems of viscose-based carbon fiber and pitch-based carbon fiber. Because the production process of PAN-based carbon fiber precursor is simpler than other methods, and the mechanical properties of the product are good, it has been developed rapidly and has become the mainstream of the current production of carbon fiber precursor. [0003] PAN-based carbon fiber precursor has excellent properties such as high strength, high modulus, high temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/096D01D10/06
CPCD01D5/096D01D10/06
Inventor 王贺团沈志刚缪金根赵微微
Owner CHINA PETROLEUM & CHEM CORP
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