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The Study on Pretreatment and Yarn Spinning Process of Polysulfonamide (PSA) Fiber

Author: WuYongZuo
Tutor: ChengLongZuo
School: Donghua University
Course: Textile Engineering
Keywords: Polysulfonamide fiber Fiber pretreatment New ring Yarn hairiness Yarn tensile properties
CLC: TS104
Type: Master's thesis
Year: 2011
Downloads: 47
Quote: 0
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Abstract

Polysulfonamide (polysulfonamide, PSA) fiber that Polyphenylsulfone terephthalamide fibers, is currently the only proprietary chemical products. The fiber has good heat resistance, thermal stability and flame retardancy, it's come to fill our grade synthetic fibers resistant to high temperature 250 ℃ blank; excellent thermal, electrical and chemical properties, making it in the industrial textiles has a good application prospect. However, due to the volume ratio of PSA fiber itself has a high resistance, low friction factor, high initial modulus range of physical characteristics, resulting in smooth fiber spinning process is difficult, and ultimately more hairiness, yarn strength is low. In this paper, fiber spinning process PSA series of problems, the use of fiber pretreatment, spinning process optimization and other methods to improve the performance of the fibers can be spun to enhance its value. Fiber pretreatment main purpose is to ensure that changes in the fiber strength and elongation case of little increase fiber surface friction coefficient, thereby increasing the fiber spinning process between cohesion. The subject of the use of fiber pretreatment program for the plasma treatment and alkali (NaOH) solution, through the PSA test to determine the optimal solution for processing fibers compared before and after treatment in the spinning process the fiber and yarn quality differences. In the spinning method, the choice Sirospun, sirofil spinning, compact (gathering) with conventional ring spinning, spinning yarns same specifications, compare the final yarn quality; analysis polysulfonamide fiber using the new ring spinning methods to improve strength and reduce hairiness causes. Experimental results show that the plasma treatment under atmospheric pressure with the treated fiber time, the fiber elongation at break of no significant change; fiber static friction coefficient has increased significantly (22.5% ~ 61.6%); PSA fiber was treated with NaOH, the temperature strength and elongation of the fibers greatest impact, bath ratio of the fibers influence the maximum static friction coefficient. In certain processing conditions, the two kinds of treatment options are possible in ensuring reduced fiber strength and elongation is not the case increase the fiber surface friction coefficient. Plasma treatment due to the current existence of a large number of fiber equipment issues such as whether the industry, the subject of a preliminary inquiry only. Final selection of alkali treatment programs as pretreatment PSA fiber spinning experiments, treatment options: NaOH concentration 20gg / L, bath ratio 1:20, temperature 80 ℃, time 50min. By alkali treatment, the PSA fiber spinning process smoothly than untreated fibers, in strips fluffy issues such as improved, eventually breaking strength of yarn increased 6.4%, 3mm total reduction of 9.5% over hairiness, evenness CV value is determined by 13.71% reduced to 12.13%. Use the same PSA rovings raw materials, using different methods spinning yarn spinning and test performance, the results show that Sirospun, sirofil spinning and tight (agglomeration) spinning can effectively improve the final PSA fiber yarn quality. In this experimental condition, compared with conventional ring, three new breaking strength of yarn ring spinning method were increased by 8%, 4.5% and 9.9%; 3mm or more harmful hairiness were reduced by 43.7%, 46.9% and 30.9 %; yarn evenness CV value also improved, especially Sirofil spun from 13.71% down to 10.11%. Further experiments verify the different pre-tension on the filament sirofil spun into yarn quality impact, the study found, with the pre-tension increases filament yarn breaking strength first increases and then decreases when the pre-tension is when 7cN , the maximum breaking strength of yarn than conventional ring spinning increase of 12.5%. The research results can be optimized in the PSA fiber applications provide some theoretical guidance.

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