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Method for directly preparing low-fineness protofilament after dry-jet wet spinning and drying

A technology of dry-jet wet spinning and drying, which is applied in stretch spinning, textile/flexible product manufacturing, fiber treatment, etc. It can solve the problems of large steam waste, uneven oiling, and blowing off of oil, etc. Achieve the effects of reducing preparation costs, broadening production, and large drawability

Pending Publication Date: 2022-08-02
ZHONGFU SHENYING CARBON FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, steam drafting also has some problems. For example, due to the large amount of steam wasted in the steam drafting process, the oil on the surface of the fiber is easily blown off during the steam drafting process, resulting in uneven oiling and the maximum K value of steam drafting. There are problems such as upper limit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Through the dry jet wet spinning process, different forms of drafting are implemented in the spinning, water washing, water drawing and drying sections. In the spinning section of dry-jet wet spinning, the solid content of the raw solution is 16%, the viscosity of the raw solution is 65pa.s, the draft ratio is 4.5 times, and the height of the air layer is 4mm. Controlled at 32°C. The temperature of dry-spraying-wet-spinning coagulation is 5°C, and the coagulation concentration is 25%. The washing tank has 14 stages, the drafting ratio is 1.25 times, and the washing temperature is 45°C. There are 3 levels of water drafting, the total multiple of water drafting is 3.0 times, the temperature of water drafting is 75 ℃, and the multiples in the water drafting tank of each level are drawn in the form of gradually decreasing. The oiling section adopts composite silicone oil emulsion, and the emulsion concentration is 1.0%. In the drying section, there are 5 drying areas, th...

Embodiment 2

[0021] Through the dry jet wet spinning process, different forms of drafting are implemented in the spinning, water washing, water drawing and drying sections. In the spinning section of dry jetting and wet spinning, the solid content of the raw solution is 15%, the viscosity of the raw solution is 60pa.s, the drafting ratio is 5.0 times, and the height of the air layer is 1mm. Controlled at 34°C. The temperature of dry-spraying-wet-spinning coagulation is 10°C, and the coagulation concentration is 25%. The washing tank has 14 stages, the drafting ratio is 1.30 times, and the washing temperature is 50°C. There are 4 levels of water drafting, the total multiple of water drafting is 3.4 times, the temperature of water drafting is 85 ℃, and the multiples in the water drafting tank of each level are gradually reduced for drafting. The oiling section adopts composite silicone oil emulsion, and the emulsion concentration is 1.0%. In the drying section, there are 5 drying areas, t...

Embodiment 3

[0023] Through the dry jet wet spinning process, different forms of drafting are implemented in the spinning, water washing, water drawing and drying sections. In the spinning section of dry jet and wet spinning, the solid content of the raw solution is 18.0%, the viscosity of the raw solution is 45pa.s, the draft ratio is 4.0 times, and the height of the air layer is 6mm. Controlled at 32°C. The temperature of dry-spraying-wet-spinning coagulation is 10°C, and the coagulation concentration is 30%. The washing tank has 10 stages, the drafting ratio is 1.23 times, and the washing temperature is 48°C. There are 3 levels of water drafting, the total multiple of water drafting is 3.2 times, the temperature of water drafting is 75°C, and the multiples in the water drafting tank of each level are drafted in the form of gradually decreasing. The oiling section adopts composite silicone oil emulsion, and the emulsion concentration is 1.2%. In the drying section, there are 5 drying ...

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Abstract

The invention discloses a method for directly preparing low-fineness protofilaments after dry-jet wet spinning and drying. According to the method, a dry-jet wet spinning process is adopted, and the low-fineness protofilament is prepared through the working sections of spinning, coagulating bath forming, washing, water drawing, oiling and drying, and after drying, direct winding is carried out. Based on the characteristics of a dry-jet wet spinning process, different forms of drafting are respectively implemented in the sections of spinning, washing, water drawing and drying, the low-fineness protofilament with the K value of 0.5-50K and the fineness of 0.8-1.3 dtex can be prepared after drying, the monofilament strength of the protofilament can reach 6.5-11cN / dtex, the steam drafting section is omitted, and the production range of the protofilaments with different K values is widened.

Description

technical field [0001] The invention belongs to the field of carbon fiber preparation, and relates to a method for directly preparing low-fineness filaments after drying by dry-spraying and wet-spinning. Background technique [0002] As a new spinning technology in the spinning industry, dry-jet wet spinning has the incomparable advantages of wet spinning and dry spinning. By comparing the disadvantages of wet spinning and the existing technical conditions of dry-jet wet spinning, it is found that by reasonably controlling the coagulation conditions of dry and wet spinning, the draft ratio of the precursor and the oxycarbonization process, homogeneous, high-strength products can be successfully prepared. , High modulus carbon fiber. [0003] At present, the preparation of carbon fiber precursors by dry jet wet spinning requires a series of processes of spinning, coagulation, washing, water drawing, oiling, drying, and steam drawing. In order to prepare low denier raw silk....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): D01D5/00D01D5/14D01F6/18
CPCD01D5/00D01D5/14D01F6/18Y02P70/62
Inventor 陈秋飞刘栋杨瑞庄二祥
Owner ZHONGFU SHENYING CARBON FIBER
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