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Oiling method of polyacrylonitrile-based carbon fiber precursor

A polyacrylonitrile-based carbon fiber and polyacrylonitrile technology, which is used in filament generation, rayon cleaning/drying, textiles and papermaking, etc. The oil is uniform and the effect of reducing oil sticking to the roller

Active Publication Date: 2021-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is the problem of non-uniform oiling, sticky oil of the drying roller and the problems caused by the stoppage of the device to clean the oil stains and hard lumps in the prior art. It provides an oiling method for polyacrylonitrile-based carbon fiber precursors, This oiling method has the advantages of uniform oiling, good spinning stability, and no sticking of oil to the dry and densified roll

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 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.

[0026] 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

[0034]The polyacrylonitrile raw silk from water washing enters the first oiling process, the oiling concentration of the first oiling process is 1.5%, and the temperature is normal temperature. 75°C, the time is 40s, after drying, the raw silk is soaked and extruded in a water bath, the temperature of pure water is 40°C, and the soaking time is 5s, by adjusting the pressure between the extrusion roller and the oiling bath roller Control the moisture content of the raw silk to 10%, and then carry out the second oiling, the concentration of the second oiling is 3%, the temperature is normal temperature, the raw silk leaving the second oiling is squeezed, and then enters the second drying and densification. The temperature is 120°C, the time is 40s, the oiling rate of the polyacrylonitrile precursor is 1.2%, and the oiling rate difference between the outer and middle of the polyacrylonitrile precursor tow is 0.08%; The oil rate difference is 0.2%, the polyacrylonitrile raw silk i...

Embodiment 3

[0036] The polyacrylonitrile raw silk from washing enters the first oiling process, the oiling concentration of the first oiling process is 2.5%, and the temperature is normal temperature. 85°C, the time is 20s, after drying, the raw silk is soaked in a water bath and squeezed, the pure water temperature is 35°C, the soaking time is 10s, the moisture content of the raw silk is controlled at 16%, and then the second oiling is carried out. The second oiling concentration is 3%, the temperature is normal temperature, the raw silk leaving the second oiling is squeezed, and then enters the second drying and densification, the temperature is 110°C, the time is 50s, and the polyacrylonitrile raw silk is oiled The rate is 1.1%, and the difference in oiling rate between the outside and the middle of the polyacrylonitrile precursor tow is 0.05%; There is no color difference, and the adhesion of the oil agent on the surface of the second drying and densifying roller is not obvious. After...

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Abstract

The invention relates to an oiling method for polyacrylonitrile-based carbon fiber precursors, which mainly solves the problems in the prior art of uneven oiling, sticky oil of drying rollers and the problems caused by shutting down the device to clean oil stains and hard blocks. By adopting an oiling method for polyacrylonitrile-based carbon fiber precursors, including at least two steps of oiling and drying and densification, and at least the polyacrylonitrile precursors after the first oiling and drying and densification are immersed in a water bath Wet, get polyacrylonitrile raw silk with a moisture content of 5% to 20%, and then carry out the technical scheme of second oiling and drying and densification, which solves this problem well and can be used for the production of polyacrylonitrile-based carbon fiber raw silk during spinning.

Description

technical field [0001] The invention relates to an oiling method, in particular to an oiling method for polyacrylonitrile-based carbon fiber 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 modu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D11/00D01D10/06
CPCD01D10/06D01D11/00
Inventor 王贺团沈志刚李磊张静
Owner CHINA PETROLEUM & CHEM CORP
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