纺长丝用聚乳酸切片的干燥工艺

纺织学报 ›› 2012, Vol. 33 ›› Issue (7): 19-23.

纺长丝用聚乳酸切片的干燥工艺

刘淑强^1，2, 戴晋明², 贾虎生^1，3, 刘旭光³, 许并社^1，3

1. 太原理工大学材料科室民工程学院
2. 太原理工大学轻纺工程与美术学院
3. 新材料界面科学与工程教育部重点实验室（太原理工大学）

收稿日期:2011-08-01 修回日期:2012-03-19 出版日期:2012-07-15 发布日期:2012-07-02
通讯作者: 贾虎生 E-mail:jia_husheng@126.com.cn
基金资助:
教育部长江学者和创新团队发展计划资助项目；太原理工大学青年基金项目

Drying process of polylactic acid chip for spinning filaments

LIU Shu-Qiang^1，2, DAI Jin-Ming², JIA Hu-Sheng^1，3, LIU Xu-Guang³, XU Bing-She^1，3

1. College of Materials Science and Engineering, Taiyuan University of Technology
2. College of Textile & Arts, Taiyuan University of Technology
3. Key Lab of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology)

Received:2011-08-01 Revised:2012-03-19 Online:2012-07-15 Published:2012-07-02
Contact: JIA Hu-Sheng E-mail:jia_husheng@126.com.cn

摘要/Abstract

摘要： 为了研究聚乳酸切片的干燥工艺,采用差示扫描量热法(DSC)测试聚乳酸切片的玻璃化转变温度(Tg)、熔点(Tm)及无定形结构，探讨干燥时间及温度对切片性能的影响关系，并对阶段性干燥进行分析。结果表明：干燥时间越长、干燥温度越高，聚乳酸切片的含水率越低，但板结率会越大，分子量下降越严重；在低温干燥阶段，主要除去切片中大部分水分，高温干燥阶段，主要除去少量内部缔合水。最终得出最佳的三阶段干燥工艺为：80℃,4h；100℃,4h；110℃,20h，使切片的含水率很低，同时又避免了大量板结和分子量下降。

关键词: 聚乳酸 , 干燥工艺 , 含水率 , 黏均分子质量

Abstract: In order to research the drying process of polylactic acid (PLA) chip, the differential scanning calorimetry (DSC) was applied to measure the glass transition temperature (Tg), the melting point (Tm) and the amorphous structure of polylactic acid chip. The effects of drying time and drying temperature on properties of chip were researched. Addition, the stage drying was analyzed. Results show that longer drying time and higher drying temperature, lead to lower moisture content, but more hardened chips and lower viscosity average molecular weight. And results also show that in initial stage, relatively low temperature was applied to remove mostly water of PLA chip, then higher temperature was used to remove small amount of associated water in chip. Finally, the result indicates the optimum three-stage drying process as follows: 80℃, 4h; 100℃, 4h; 110℃, 20h, which led to low moisture content, and avoid much hardened chips and decrease of viscosity average molecular weight.

Key words: polylactic acid , drying process , moisture content , viscosity average molecular weight

中图分类号:

TS 102.5

刘淑强, 戴晋明, 贾虎生, 刘旭光, 许并社. 纺长丝用聚乳酸切片的干燥工艺[J]. 纺织学报, 2012, 33(7): 19-23.

LIU Shu-Qiang, DAI Jin-Ming, JIA Hu-Sheng, LIU Xu-Guang, XU Bing-She. Drying process of polylactic acid chip for spinning filaments[J]. JOURNAL OF TEXTILE RESEARCH, 2012, 33(7): 19-23.

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