Washing method for spinneret plate

A spinneret and spinning assembly technology, applied in the field of spinneret cleaning, can solve the problems of many filaments, many polyacrylonitrile raw silk wool, high fiber breakage rate, etc. The effect of fewer filaments and fewer filaments

Inactive Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the spinneret in the prior art is not cleaned cleanly, the gel on the surface of the spinneret sticks to stay, the spinning solution at the outlet of the spinneret hole flows, and the polyacrylonitrile raw silk has many fluffs. , the technical problem of many filaments and high fiber breakage rate; the invention provides a method for cleaning the spinneret; the method has the advantage that the surface of the spinneret will not cause gel sticking due to blockage during the next spinning , can effectively slow down the overflow phenomenon of the spinning solution at the exit of the spinneret hole, and the polyacrylonitrile fiber has the advantages of less wool and broken filaments, and a low broken end rate of the fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Remove the spinneret from the spinning assembly of dry-jet wet spinning, put it into a container filled with dimethylformamide, ensure that the liquid level of dimethylformamide is higher than the upper edge of the spinneret, and the spinneret The outer surface of the container must not touch the bottom of the container. Tighten the mouth of the container with a plastic wrap and a rubber band, put the container into an ultrasonic water bath with a heating function, set the temperature of the water bath to 40°C, and the ultrasonic time to 50 minutes. Turn on the ultrasonic cleaning of the spinneret. After the first pass of cleaning is completed, the container is taken out from the water bath, replaced with new dimethylformamide, and then the second pass of cleaning is started, and the time is still 50 minutes. Repeat this cycle for 6 times. After cleaning, put the spinneret into a vacuum oven at 130° C. for 20 minutes and dry it at a pressure of 0.003 MPa. Finally, th...

Embodiment 2

[0023] Remove the spinneret from the spinning assembly of wet spinning, put it into a container filled with dimethyl sulfoxide, ensure that the liquid level of dimethyl sulfoxide is higher than the upper edge of the spinneret, and the spinneret The outer surface of the container must not touch the bottom of the container. Tighten the mouth of the container with a plastic wrap and a rubber band, put the container into an ultrasonic water bath with a heating function, set the temperature of the water bath to 60°C, and the ultrasonic time to 60 minutes. Turn on the ultrasonic cleaning of the spinneret. After the first pass of cleaning is completed, take out the container from the water bath, replace it with a new dimethyl sulfoxide, and then start the second pass of cleaning, and the time is still 60 minutes. Repeat this cycle for 3 times. After cleaning, put the spinneret into a vacuum oven at 80° C. for 10 minutes and dry it at a pressure of 0.005 MPa. Finally, the gas filte...

Embodiment 3

[0025] Remove the spinneret from the spinning assembly of wet spinning, put it into a container filled with dimethylacetamide, ensure that the liquid level of dimethylacetamide is higher than the upper edge of the spinneret, and the spinneret The outer surface of the container must not touch the bottom of the container. Tighten the mouth of the container with a plastic wrap and a rubber band, put the container into an ultrasonic water bath with a heating function, set the temperature of the water bath to 90°C, and the ultrasonic time to 20 minutes. Turn on the ultrasonic cleaning of the spinneret. After the first pass of cleaning is completed, take out the container from the water bath, replace with new dimethylacetamide, and then start the second pass of cleaning, the time is still 20 minutes. Repeat this cycle for 5 times. After cleaning, put the spinneret into a vacuum oven at 50°C and dry for 5 minutes at a pressure of 0.007 MPa. Finally, the gas filtered by a filter ma...

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Abstract

The invention relates to a washing method for a spinneret plate, and mainly solves the technical problems in the prior art that the spinneret plate cannot be cleanly washed, gel is adhered to the surface of the spinneret plate, a spinning solution at the outlet of a spinneret hole overflows, and polyacrylonitrile protofilament has more broken filaments and more thin filaments and is high in fiber breakage rate. The washing method for the spinneret plate comprises the following steps of disassembling the spinneret plate from a spinning assembly; immersing the spinneret plate in a solvent in a container; then immersing the container in water bath; washing by adopting a mode of combining temperature rising with ultrasound; taking out the spinneret plate after the washing is completed; blowing the surface of the spinneret plate by gas which is precisely filtered after the spinneret plate is dried; completing the washing. According to the technical scheme, the problems are well solved, and the washing method can be used in a device washing process after the spinning of the polyacrylonitrile protofilament.

Description

technical field [0001] The invention belongs to a cleaning method for spinning equipment, in particular to a cleaning method for a spinneret used for producing polyacrylonitrile fibers. Background technique [0002] Polyacrylonitrile-based carbon fiber has the advantages of high specific strength, high specific modulus, high temperature resistance, corrosion resistance and good weaving performance, so it is widely used in many fields such as sports equipment, construction engineering, oil exploration and aerospace. The production process of polyacrylonitrile-based carbon fiber is a systematic and lengthy process, including spinning, pre-oxidation and carbonization. This involves a lot of equipment, including textile equipment and high-temperature treatment equipment. [0003] For fiber quality, the quality of spinning equipment is very important, especially carbon fiber. Such high-quality special fibers are a formidable challenge for spinning equipment. In the spinning equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D4/04
Inventor 王贺团沈志刚屠晓萍李磊赵微微
Owner CHINA PETROLEUM & CHEM CORP
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