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Method for Preventing Skinning of Spinning Dope Conveying Pipe

A spinning dope and conveying tube technology, which is applied in textiles and papermaking, spinneret assemblies, feeding solution to spinnerets, etc., can solve the problems of easy skinning of the spinning dope conveying tube, and avoid the phenomenon of skinning. , the effect of preventing skin formation

Active Publication Date: 2017-09-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that in the prior art, after the spinning dope delivery pipe is cleaned, there is a problem that the spinning dope delivery pipe is easy to skin, and a new method for preventing the spinning dope delivery pipe from skinning is provided.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 20% of the pipeline volume of dimethyl sulfoxide in the pipeline between the polymerization tank and the single tank, the single tank to the defoaming tank, the defoaming tank to the filter, and the filter to the spinning metering pump, and then flush into Nitrogen with a water content of 1 ppm and a purity of 95% is controlled at an absolute pressure of 100 KPa, and the temperature of the spinning dope delivery pipeline is kept at 20°C. Drain dimethyl sulfoxide from the system before next use. During the spinning process, the pre-spinning pressure is stable, the clogging of the spinneret caused by the skinning phenomenon is obviously alleviated, and the thickness of the tow is uniform.

Embodiment 2

[0018] Add the dimethyl sulfoxide of 50% pipeline volume in the pipeline between polymerization still to single-off still, single-off still to degassing still, degassing still to filter, filter to spinning metering pump, flush into the pipeline containing then The water content is 100 ppm, the nitrogen gas with a purity of 97%, its absolute pressure is controlled at 300 KPa, and the temperature of the spinning dope delivery pipeline is kept at 40°C. Before the next use, the nitrogen pressure is released to normal pressure, and the dimethyl sulfoxide is drained from the system. During the spinning process, the pre-spinning pressure is stable, the clogging of the spinneret caused by the skinning phenomenon is obviously alleviated, and the thickness of the tow is uniform.

Embodiment 3

[0020] Add 90% of the pipeline volume of dimethyl sulfoxide to the pipeline between the polymerization kettle, the singleton removal kettle, the singleton removal kettle to the defoaming kettle, the defoamer to the filter, and the filter to the spinning metering pump, and then flush into the pipeline containing The water content is 10 ppm, and the nitrogen gas with a purity of 99.99% is controlled at an absolute pressure of 500 KPa, and the temperature of the spinning dope delivery pipeline is kept at 60°C. Before the next use, the nitrogen pressure is released to normal pressure, and the dimethyl sulfoxide is drained from the system. During the spinning process, the pre-spinning pressure is stable, the clogging of the spinneret caused by the skinning phenomenon is obviously alleviated, and the thickness of the tow is uniform.

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PUM

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Abstract

The invention relates to a method for preventing a spinning-solution conveying pipe from crusting, and mainly solves the problem that a polymeric spinning-solution conveying pipe in the prior art crusts after being washed. The method disclosed by the invention comprises the following steps of adopting at least one solvent containing dimethyl sulfoxide, dimethyl formamide, dimethylacetamide, injecting the solvent in the spinning-solution conveying pipe, and controlling the volume of the solvent in the spinning-solution conveying pipe to account for 20-95% of that of the conveying pipe; and injecting carrier gas in the spinning-solution conveying pipe, and controlling the absolute pressure to be 100-1000 KPa. The technical scheme that the carrier gas and the solvent are discharged before the spinning-solution conveying pipe is reused is adopted, so that the problem is well solved, and the method can be used in the industrial production from the end of washing the spinning-solution conveying pipe to the reuse of the spinning-solution conveying pipe.

Description

technical field [0001] The invention relates to a method for preventing skinning of a spinning dope delivery pipe, more specifically, the invention relates to a method for preventing skinning of a polyacrylonitrile-based carbon fiber spinning dope delivery pipe after cleaning. Background technique [0002] Carbon fiber is a new type of carbon material with a carbon content greater than 90%. Because of its high specific strength and specific modulus, excellent high temperature resistance, and chemical corrosion resistance, it is widely used in military, civil, aviation and aerospace fields. Has been widely used. The output of carbon fiber prepared by using polyacrylonitrile-based copolymer as a precursor has reached more than 90% of the total output of carbon fiber, which is an important method for preparing carbon fiber. [0003] In the production process of polyacrylonitrile-based carbon fiber precursors, the spinning stock solution after polymerization needs to go through...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D4/04D01D1/09
CPCD01D1/09D01D4/04
Inventor 李磊沈志刚屠晓萍王贺团肖士洁
Owner CHINA PETROLEUM & CHEM CORP
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