Efficient cleaning method of spinneret plate for mesophase pitch melt spinning

A mesophase pitch and melt spinning technology, which is applied in the direction of spinneret assemblies, textiles and papermaking, and complete sets of equipment for the production of artificial threads, to achieve the effects of shortening drying time, high efficiency, and prolonging life

Inactive Publication Date: 2020-02-21
上海高强高模新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem of efficient cleaning of mesophase pitch melt spinning spinnerets without d

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of efficient cleaning method of mesophase pitch melt spinning spinneret, comprises the following steps:

[0033] S1. After cooling a 200-hole spinneret (hole diameter 0.3mm, aspect ratio 4) disassembled on site to room temperature, the copper knife gently scraped off the mesophase pitch adhered on the surface of the spinneret; the softening point of the mesophase pitch The spinning temperature is 280°C and the spinning temperature is 360°C;

[0034] S2. Put the spinneret treated in step S1 flatly on the self-made spinneret support frame, with the direction of the diversion opening downward (rough opening), and place it in a high-temperature furnace. Nitrogen is passed through the furnace, and the temperature is gradually raised to 390°C and maintained for 1.5 hours;

[0035] S3. After cooling the spinneret treated in step S2 to room temperature, the copper knife gently scrapes off the adhered mesophase pitch on the surface of the spinneret;

[0036] S4. The spi...

Embodiment 2

[0041] A kind of efficient cleaning method of mesophase pitch melt spinning spinneret, comprises the following steps:

[0042] S1. After cooling a 500-hole spinneret disassembled on site (aperture 0.28mm, aspect ratio 2) to room temperature, the copper knife gently scraped off the adhered mesophase pitch on the surface of the spinneret; the softening point of the mesophase pitch is 255°C, and the spinning temperature is 320°C;

[0043] S2. Put the spinneret treated in step S1 flatly on the self-made spinneret support frame, with the direction of the diversion opening downward (rough opening), and place it in a high-temperature furnace. Nitrogen is passed through the furnace, and the temperature is gradually raised to 360°C for 2 hours;

[0044] S3. After cooling the spinneret treated in step S2 to room temperature, the copper knife gently scrapes off the adhered mesophase pitch on the surface of the spinneret;

[0045] S4. The spinneret treated in step S3 is treated with a h...

Embodiment 3

[0050] A kind of efficient cleaning method of mesophase pitch melt spinning spinneret, comprises the following steps:

[0051] S1. After cooling a 500-hole spinneret disassembled on site (aperture 0.28mm, aspect ratio 2) to room temperature, the copper knife gently scraped off the adhered mesophase pitch on the surface of the spinneret; the softening point of the mesophase pitch The spinning temperature is 280°C and the spinning temperature is 360°C;

[0052] S2. Put the spinneret treated in step S1 flat on the self-made spinneret support frame, and place the diversion port downward (rough mouth), and place it in a high-temperature furnace; nitrogen gas is passed through the furnace, and the temperature is gradually raised to 380°C , maintain 1h;

[0053] S3. After cooling the spinneret treated in step S2 to room temperature, the copper knife gently scrapes off the adhered mesophase pitch on the surface of the spinneret;

[0054] S4. The spinneret treated in step S3 is treat...

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Abstract

The invention belongs to the technical field of spinneret plate cleaning in chemical fiber manufacturing industry and discloses an efficient cleaning method of a spinneret plate for mesophase pitch melt spinning. The method includes: cooling the spinneret plate dismantled on site, scraping mesophase pitch on the surface of the spinneret plate, and subjecting the spinneret plate to high-temperaturetreatment in inert gas; cooling the spinneret plate, scraping the mesophase pitch on the surface of the spinneret plate, and subjecting the spinneret plate to salt bath treatment; cooling the spinneret plate, removing molten salt on the surface of the spinneret plate, subjecting the spinneret plate to ultrasonic treatment, and using compressed air to blow the surface of the spinneret plate; drying the spinneret plate, and inspecting. The method has the advantages that the treatment steps in the method are effective solutions for actual problems instead of simply listed and added steps, the cleaning efficiency of the method is much higher than that of existing methods, and adverse influence such as spinneret plate deformation can be avoided. Tests show that the qualification rate of the spinneret plates cleaned by the method can reach 100%.

Description

technical field [0001] The invention belongs to the technical field of spinneret cleaning in the chemical fiber manufacturing industry, and in particular relates to an efficient cleaning method for mesophase pitch melt spinning spinnerets. Background technique [0002] High-performance mesophase pitch-based carbon fiber has the characteristics of high thermal conductivity, high modulus, and high strength. It is a key material monopolized by the United States and Japan. It plays a huge role in nuclear industry, military defense, aerospace and other fields. Mesophase pitch-based carbon fibers are prepared from mesophase pitch at high temperature through a series of processes such as melt spinning, pre-oxidation, carbonization, and graphitization, among which melt spinning is a key step in fiber formation. The thickness of the spinneret for mesophase pitch-based carbon fiber melt spinning is generally about 10mm, and because of its small pore size (between 0.1mm-0.3mm), the asp...

Claims

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Application Information

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IPC IPC(8): D01D4/04D01D13/02
CPCD01D4/04D01D13/02
Inventor 庞守德高强查凌驰
Owner 上海高强高模新材料科技有限公司
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