BOPP热稳定性研究  

Study on Heat Stability of PP for BOPP Film

作　　者：杨伟[1] 李忠明[1] 于庆顺[1] 冯建民[1] 杨鸣波[1] 

机构地区：[1]四川大学高分子材料科学与工程系

出　　处：《中国塑料》2001年第10期43-46,共4页China Plastics

基　　金：国家重点基础研究专项经费资助 (G19990 6 480 5 )

摘　　要：通过HAAKE流变仪和熔体流动速率 (MFR)测试仪对国内常用的几种进口和国产的用于生产双向拉伸聚丙烯薄膜 (BOPP)的专用料的热稳定性能进行了研究。结果表明 :几种物料的热稳定性相差不大 ,但是其中T36F在热、氧、剪切力作用下的稳定性最好 ,其次是FS 30 11和F 2 80 ,PD 382的稳定性较差。进口料PD 382在 2 5 0℃下经过 30min后 ,热降解现象明显 ,可能是由于PD 382等规度较低、分子量分布较小及高相对分子质量级分含量较高。相对而言 ,国产料T36F的降解就弱得多 ,这可能因为国产料等规度较高 ,平均相对分子质量也较大等因素造成的。所以 ,BOPP料生产中 ,不仅应当将等规度控制在合适的范围内 ,而且应当注意控制聚合物的序列结构 ,控制好其相对分子质量分布 ,使其更加均匀 ,以更加有利于物料的成型加工。Stability of several kinds of polypropylene (PP) for biaxially oriented polypropylene(BOPP) was studied by means of a HAKKE rheometer and a melt flow rate tester.Results show that there is not much difference in the stability of the materials,but under heat,oxyen and stress,the stability of T36 F of PP is the best,followed by FS 3011 and F 280 ,and that of PD 382 is the worst.The import PD 382 degrades a lot after 30 minutes at the temperature of 250 ℃ because the degree of its isotacticity is low,its molecular weight distribution is narrow and content of high molecular weight is much.Comparatively,the degradation of T36 F is much lower because of its higher degree of isotacticity and higher average molecular weight.So in the production of PP resin for BOPP films,not only the degree of isotacticity,but also the sequence structure and molecular weight distribution should be well controlled to improve the processability of BOPP films.

关 键 词：双向拉伸聚丙烯 热稳定性 热降解 BOPP 薄膜 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业] O631.31[理学—高分子化学]