表面改性剂对Zn-Mg-Al水滑石热稳定剂性能影响  

Effect of Surface Modifier on Properties of Zn-Mg-Al Hydrotalcites as Heat Stabilizer

作　　者：周喜 袁浩坤 何鹏 向维望 ZHOU Xi;YUAN Hao-kun;HE Peng;XIANG Wei-wang(College of Food and Chemical Engineering,Shaoyang University,Shaoyang 422000,Hunan,China;Shaoyang Tiantang Addititives Chemical Co.,Ltd,Shaoyang 422002,Hunan,China)

机构地区：[1]邵阳学院食品与化学工程学院,湖南邵阳422000 [2]邵阳天堂助剂化工有限公司,湖南邵阳422002

出　　处：《精细化工》2018年第8期1389-1394,共6页Fine Chemicals

基　　金：湖南省知识产权战略实施专项(2017G412G)~~

摘　　要：以Mg Cl2·6H2O、Zn SO4·7H2O、Na Al O2为原料,对共沉淀法合成的Zn-Mg-Al水滑石进行表面改性,并采用转矩流变仪、静态热老化法评价改性Zn-Mg-Al作为聚氯乙烯（PVC）热稳定剂的性能,重点考察了表面改性剂种类对PVC热稳定性的影响。结果表明,以聚乙二醇为表面改性剂时,制备的改性Zn-Mg-Al水滑石具有较好的热稳定性能,相应PVC流变样品的初期白度为90.20,长期热稳定时间为1863 s。考察了Zn2＋/Mg2＋物质的量比对聚乙二醇改性Zn-Mg-Al水滑石热稳定性能的影响。当n（Zn2＋）︰n（Mg2＋）=1︰3或1︰7时,制备的改性Zn-Mg-Al水滑石可使PVC的长期热稳定时间达到约31 min。热稳定时间为20 min时,聚乙二醇改性Zn-Mg-Al水滑石（白度89.94）抑制PVC的初期着色性能优于Mg-Al水滑石（白度84.87）。Zn-Mg-Al hydrotalcite was prepared from Mg Cl2·6 H2 O 、 Zn SO4·7 H2 O 、 Na Al O2 by coprecipitation and then modified. And the properties of samples used as thermal stabilizer for polyvinyl chloride（PVC） were evaluated by torque rheometer and static thermal aging method. The effects of kinds of surface modifier on the thermal stability of Zn-Mg-Al hydrotalcites were mainly investigated. The results showed that polyethylene glycol modified Zn-Mg-Al hydrotalcite had good thermal stability. The initial whiteness of the corresponding PVC rheological sample was 90.20 and the long-term heat stabilization time was 1863 s. Simultaneously, the effects of Zn2＋/Mg2＋ molar ratio on the thermal stability of polyethylene glycol modified Zn-Mg-Al hydrotalcites were investigated. The modified Zn-Mg-Al hydrotalcite with a Zn2＋/Mg2＋ molar ratio of 1︰3 or 1︰7 could make the long-term thermal stability time of PVC reach about 31 minutes. In addition, polyethylene glycol modified Zn-Mg-Al hydrotalcite enhanced the whiteness value（89.94） compared with Mg-Al hydrotalcite（84.87） when heat stabilization time was 20 min, indicating that polyethylene glycol modified Zn-Mg-Al hydrotalcite could ensure good-initial coloring.

关 键 词：表面改性剂 水滑石 聚乙二醇 热稳定剂 橡塑助剂 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]