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Cleaning method for polyacrylonitrile precursor spinning spinneret

A polyacrylonitrile and spinneret technology, which is applied in spinneret assemblies, textiles and papermaking, etc., can solve the problems of difficult to achieve cleaning effect and long cleaning time.

Active Publication Date: 2013-12-18
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing cleaning methods, either the cleaning time is too long, or it is difficult to achieve the desired cleaning effect

Method used

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  • Cleaning method for polyacrylonitrile precursor spinning spinneret

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] After spinning, remove the spinneret, fix it on a polytetrafluoroethylene holder, and put them together in a beaker.

[0069] Add analytically pure dimethyl sulfoxide (DMSO) solvent into the beaker to completely submerge the spinneret, then put it into an ultrasonic cleaner to start cleaning. The temperature and power of the ultrasonic cleaner were set at 80°C and 100W, respectively. After washing for 2 hours, replace the dimethyl sulfoxide (DMSO) solvent, and wash again according to the above conditions. Repeat this 3 times.

[0070] The dimethyl sulfoxide (DMSO) solvent was replaced with about 67% concentrated nitric acid, and 1 wt% of ultrafine silica particles with a particle size of 5 μm were added for ultrasonic cleaning. The temperature and power of the ultrasonic cleaner were set at 60°C and 100W, respectively. After cleaning for 2 hours, replace the concentrated nitric acid and ultrafine silica particles, and clean again according to the above conditions. R...

Embodiment 2-5

[0076] The same cleaning steps as in Example 1 were adopted, the only change being the conditions shown in Table 1 during the nitric acid ultrasonic cleaning process.

[0077] Table 1

[0078]

[0079] The cleaning effects of Examples 2 to 5 show that the spinneret after cleaning is also detected by an optical microscope, and no clogged spinneret holes are found, which can be used for spinning.

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Abstract

The invention discloses a cleaning method for a polyacrylonitrile precursor spinning spinneret. The cleaning method comprises the step of performing ultrasonic cleaning treatment on the spinneret by nitric acid added with inorganic particles. The invention further discloses a multi-step cleaning method for the polyacrylonitrile precursor spinning spinneret in combination with the cleaning method. The method is short in cleaning time and good in cleaning effect.

Description

technical field [0001] The invention relates to the technical field of maintenance and treatment of polyacrylonitrile raw silk spinning machine parts, in particular to a method for cleaning a polyacrylonitrile raw silk spinning spinneret. Background technique [0002] Carbon fiber has many excellent properties such as low density, high specific strength, high specific modulus, high temperature resistance and corrosion resistance, and has been widely used in various fields of aerospace, national defense and civilian industries. According to the raw material route, carbon fiber can be divided into three types: polyacrylonitrile (PAN)-based, pitch-based and viscose-based. Among them, PAN-based carbon fiber has become a carbon fiber with the fastest development, the highest output, the most varieties and the widest application due to its simple production process, low production cost and excellent mechanical properties. [0003] It is well known that high-quality PAN precursors...

Claims

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Application Information

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IPC IPC(8): D01D4/04
Inventor 欧阳琴陈友汜马洪波莫高明黄显雯杨建行
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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