| Acrylic fiber is one of the most important textile materials, withhuge production and broad use. Acrylic, polyester and nylon are called asthree big synthetic fibers. Acrylic has many good properties such as feelof wool, good puffiness, good warm heat preservation; and has goodanti-mildew, heatproof performance; bright dyeing; the lightfastness isvery good in all synthetic fibers. But the acrylic fabric, especially theknitting fabric, has bad anti-pilling performance, which seriously affectswearing performance. It is not only inaesthetic in appearance, but also notcomfortable in feeling. Therefore the research on improving acrylicanti-pilling performance is very significant.This main research object is physically modified anti-pilling acrylicfiber which was researched and developed by Shanghai Sinopec. Thiskind of acrylic fiber was produced on the conventional acrylic fiberproduction line with just a little craft changes. Through these changes,certain flaws took place in the acrylic fiber internal structure, which caused some reduce in its breaking strength, breaking work and hookstrength, so as to improve anti-pilling performance of acrylic fiber.Obtaining the following several points through a series of experimentsand its analysis:(1) Testing the anti-pilling level of conventional acrylic fabric andphysically modified acrylic fabric by means of Martindale method in thesame texture, the level was 2 and 4 respectively. Obviously, theanti-pilling performance of physically modified acrylic fabric wassuperior to the conventional acrylic fabric in the condition of the sametexture.(2) Changing test method, rub the conventional acrylic fabric and thephysically modified acrylic fabric with the same texture on Martindaleseparately, in the revolutions of 500, 1000, 1500．.. 3500, 4000, andobserve their fuzz ball situation. Through the experiment, we could noticethat the fuzz ball amount of physically modified acrylic fabric reached thepeak 78/8cm~2 at the revolution of 1000 ,but at the revolution of 4000, itwas only 15/8cm~2 left, so 70．5% of them were rubbed off; But under thesame situation the fuzz ball amount of conventional acrylic fabric reachedthe peak of 138/8cm at the revolution of 2000, at 4000 revolutions, thefuzz ball amount reduces to 100/8cm~2 ,only 27．5% of them were rubbedoff. Thus it can be seen the fuzz ball of the physically modified acrylicfabric fell off more thoroughly and left less fuzz ball. And this was our right goal.(3) Analysis the pilling course from the angle of homeostasis. In fact, thefabric pilling process is a balance between ball forming and ball falling.Through observing the pilling process of physically modified acrylicfabric and the conventional acrylic fabric, we obtained ball forming andfalling speed curvilinear sketch. We could distinguish different stage byspeed relation between ball forming and falling. When the forming speedwas faster than the falling speed, the fuzz ball would become more andmore; when the forming speed was equal to the falling speed, the numberof fuzz ball got to peak or the balance; when the forming speed was lowerthan the falling speed, the fuzz ball would become less and less. The areamargin between two sides of the sketch could intuitively show us the ballfalling extent and the remaining balls of the two kind of fabric. Such ananalysis could better reflect the actual process of pilling, which developeda new way for the research of fabric anti-pilling.(4) Using DMF solution and water-soluble polyurethane solution to dothe optimization anti-pilling finishing on the Conventional acrylic fabricand comparing their anti-pilling performance with the physicallymodified acrylic fabric in the same texture, we could get conclusion asfollow : DMF solution finishing could get better consequence ofanti-Pilling Performance by a big margin, but the condition was difficultto control, and the industrial cost was not conducive to further promotion; Water-soluble polyurethane finishing was better on the improvement ofanti-pilling properties, but could cause worse feel and yellowing on thesurface of the fabric, and adding costs, therefore we it could not bepromoted. By contrast, physically modified acrylic for anti-pilling, didn'tneed a lot of cost increase and obtained an excellent improvement onanti-pilling performance, so it was more suitable for use and promotion.(5) Through the test to several kinds of pure Spinning physicallymodified acrylic fabric which were knitted on flat bed machine, we couldget the conclusion as fellow: the anti-pilling performance of Physicallymodified acrylic fabric was better than the conventional acrylic fabricwith the same texture. Though with same raw materials but with differenttexture the anti-pilling performance would be different. According to theproperties of physically modified acrylic, several kinds of blendedknitting fabrics were developed, experiments shew their anti-pillingperformance was excellent, so we could develop different clothingproducts according to their different characteristics.Jiang lianying(Textile Engineering)Supervised by Professor Gu zhaowen... |
PDF Full Text Request