PVA/水溶性聚酯混合浆液的浆膜性能探讨

2018-09-10 12:40:43张晨阳沈艳琴武海良
现代纺织技术 2018年3期

张晨阳 沈艳琴 武海良

摘要:研究了不同相对湿度下,PVA1799与水溶性聚酯混合浆膜的吸放湿规律,分析了共混比对混合浆膜吸放湿性能的影响,探讨了回潮率与混合浆膜物理力学性能的关系。结果表明,PVA1799/水溶性聚酯浆料65/35在相对湿度为56%,吸湿平衡回潮率为2.9%时,浆膜综合性能较理想;PVA1799/水溶性聚酯浆料80/20在相对湿度为56%,吸湿平衡回潮率为1.1%时,浆膜综合性能较理想。指出PVA含量高是低湿度下纱线完成可织性的基础。

关键词:回潮率;PVA1799/水溶性聚酯;吸放湿规律;浆膜性能

中图分类号:TS115.2文献标志码:A文章编号:1009-265X(2018)03-0080-04Discussion on Film Property for Blended Size of PVA/Water Soluble Polyester

ZHANG Chenyang, SHEN Yanqin, WU Hailiang

(School of Textile and Materials, Xian Polytechnic University, Xian 710048, China)Abstract:The rules of moisture absorption and desorption for blended film of PVA1799/watersoluble polyester were studied under different relative humidity, and the influences of blending ratio on absorption and desorption property of blended film were analyzed. The relation between moisture regain and physical and mechanical properties of blended film was discussed. The test results show that comprehensive properties of blended film are ideal when relative humidity and equilibrium moisture regain of PVA1799/water soluble polyester size 65/36 is 56% and 2.9% respectively. Comprehensive properties of blended film are ideal when relative humidity and equilibrium moisture regain of PVA1799/water soluble polyester size 80/20 is 56% and 1.1% respectively. It is pointed out that high content of PVA is fundamental to yarn weavability under low humidity.

Key words:moisture regain; PVA1799/water soluble polyester; principles of moisture absorption and desorption; property of film

通信作者:沈艷琴,Email:shenyanqin1208@126.com目前,在经纱上浆所用的浆料中,高分子合成浆料聚乙烯醇(PVA)以其浆膜强韧、耐磨性好等优点仍然占主导地位。但煮浆时间长,浆液易结皮,且退浆困难仍然是PVA的主要缺点,并且PVA浆膜在任何环境程度下都呈现高的内聚力,而这一高的强力在浆纱实际生产工艺中会带来浆纱干分绞困难的现象,严重影响了浆纱质量,表现为浆纱毛羽伏贴性差,不利于纱线在织机上的耐磨性。这就是纺织浆纱工艺中不能单独使用PVA的原因。因此,浆纱工作者在调制浆液、设计浆纱工艺时都将PVA与其他浆料混合使用。而近年来对聚酯浆料缩聚单体的研究过程中,人们相继开发出各种性能改进的新型聚酯浆料。这类浆料的吸湿性和水溶性适中,且再粘性小,不会在钢筘上产生落浆,上浆率相比于其他浆料大为降低,并易于退浆,退浆废液易生物降解,且浆液表面张力低,有很好的渗透性[1]。……

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