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Fireproof yarn high in limit oxygen index, preparation method of fireproof yarn and fabric of fireproof yarn

A technology of limiting oxygen index and yarn, applied in the field of high limiting oxygen index fireproof yarn and its preparation, can solve the problems of complex process, unsmooth sliver making, poor cohesion, etc., and achieve simple process and strong operability. Effect

Inactive Publication Date: 2015-11-11
SHANGHAI LABON TECHNICAL FIBER CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

This blending dissolution process is complex and costly;
[0005] At present, the blending of polyacrylonitrile preoxidized fiber and aramid fiber is generally used in the market to improve the spinnability and strength of polyacrylonitrile preoxidized fiber, but the LOI of aramid fiber is about 28, and the LOI of the fabric increases with the amount of aramid fiber. However, due to the poor cohesion of the polyacrylonitrile preoxidized fiber, the sliver making will not be smooth during the blending process, and the problems of polyacrylonitrile preoxidized fiber velvet and pulverization will occur. The production rate is only 70-80%

Method used

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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  • Fireproof yarn high in limit oxygen index, preparation method of fireproof yarn and fabric of fireproof yarn
  • Fireproof yarn high in limit oxygen index, preparation method of fireproof yarn and fabric of fireproof yarn

Examples

Experimental program
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Effect test

preparation example Construction

[0033] see figure 2 , the preparation method of high limit oxygen index fireproof yarn, comprises the steps:

[0034] (1) Preparation of polyacrylonitrile preoxidized short fibers

[0035] The polyacrylonitrile preoxidized fiber is subjected to surface deoiling, primary crimping, spinning oil impregnation, secondary crimping, drying and setting, and cutting to obtain polyacrylonitrile preoxidized short fibers with excellent cohesion;

[0036] (2) Preparation of fireproof yarn with high limiting oxygen index

[0037] The polyacrylonitrile preoxidized short fiber prepared in step (1) is blended with the flame-retardant and high-temperature-resistant short fiber to obtain a fireproof yarn with a high limiting oxygen index.

Embodiment 1

[0040] The 320,000-denier polyacrylonitrile preoxidized fiber is deoiled in a 3-meter-long deoiling bath containing 1% sodium dodecylsulfonate surfactant at a temperature of 85°C, and then crimped for the first time to obtain the number of crimps The fiber tape is 3-4 pieces / cm. After dipping in a 3-meter-long mixed oil water bath containing antistatic agent, softener and emulsifier at a temperature of 85 ° C, it is curled for the second time to obtain the number of crimps. It is a fiber tape of 8 pieces / cm, dried and heat-set and cut into 51mm long polyacrylonitrile pre-oxidized fiber for future use. The fiber shows obvious curl and fluffy state.

Embodiment 2

[0042] Take the polyacrylonitrile pre-oxidized staple fiber prepared in Example 1 and para-aramid fiber blended according to the ratio of 85:15, through conventional methods such as blowing, carding, drawing, slubbing, fine spinning, doffing, and twisting, etc. In the ring spinning process, the yarn 40Nm / 2 containing 85% polyacrylonitrile preoxidized fiber is spun, and it is woven into a plain weave fabric. The limiting oxygen index LOI is 42% and the fabric production rate is 95.2%.

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Abstract

The invention discloses fireproof yarn high in limit oxygen index. The fireproof yarn is formed by blending polyacrylonitrile pre-oxidation short fibers and flame-retardant high-temperature-resistant short fibers, wherein the polyacrylonitrile pre-oxidation short fibers account for more than 80% of the whole fireproof yarn high in limit oxygen index by mass. The invention further discloses fabric woven by the fireproof yarn high in limit oxygen index. The problems that pre-oxidation fibers are poor in spinning property and likely to break, and polyacrylonitrile pre-oxidation fiber yarn and fabric thereof can not be woven by the pre-oxidation fibers are solved.

Description

technical field [0001] The invention relates to the technical field of textiles, in particular to a high limiting oxygen index (LOI) fireproof yarn, a preparation method and a fabric thereof. Background technique [0002] Polyacrylonitrile pre-oxidized fiber is obtained by treating polyacrylonitrile fiber with specific equipment and pre-oxidation process. The carbon content is higher than 55%, and the LOI is generally higher than 40%. No shrinkage, no droplet, but also has good electrical insulation, heat insulation and arc resistance, it is an ideal fire retardant material, but the surface of the fiber is smooth, and the cohesion between the fibers is very small , resulting in poor spinnability, which brings difficulty to spinning and weaving. In response to this problem, domestic and foreign scholars have also made various attempts, but the results are not satisfactory. [0003] In USP2007148455, it is reported that the raw material polyacrylonitrile preoxidized fiber to...

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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Patent Type & Authority Applications(China)
IPC IPC(8): D02G3/44D02G3/04D06M13/256D06M13/262D06M13/292D06M101/28
Inventor 尤秀兰尤松陈洪新
Owner SHANGHAI LABON TECHNICAL FIBER CO LTD
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