硬脂酸对磷石膏的改性研究  

Surface modification of phosphogypsum by stearic acid

作　　者：秦军[1,2] 金翠霞[3] 于杰 杨丽萍 

机构地区：[1]喀斯特环境与地质灾害防治教育部重点实验室(贵州大学),贵州贵阳550003 [2]国家复合材改性聚合物材料工程技术研究中心 [3]贵州大学化学工程学院 [4]瓮福集团有限责任公司

出　　处：《无机盐工业》2009年第10期47-49,共3页Inorganic Chemicals Industry

基　　金：国家科技支撑计划课题(2007BAB08B05);喀斯特环境与地质灾害防治教育部重点实验室开放基金课题(2008K-04)

摘　　要：为解决磷石膏的亲水性问题，提高其与聚合物的相容性，采用硬脂酸对磷石膏进行表面改性。以活化指数为指标，确定其最佳改性条件：硬脂酸的用量为磷石膏质量的2％，改性时间为20min，改性温度为60℃，pH为7～8。在最佳改性条件下，改性后磷石膏的活化指数达到100％，完全疏水。对改性前后的磷石膏进行了抽提实验和红外光谱测试，结果表明磷石膏与硬脂酸之间发生了化学键合作用。初步工业实验表明，改性磷石膏可用作聚丙烯树脂的无机填料，且其与聚合物的相容性较好，磷石膏／聚丙烯复合材料的力学性能较纯聚丙烯有所提高。Surface of phosphogypsm was modified with stearic acid to solve the problem of phosphogypsum＇s hydrophilicity and to improve its compatibility with the polymers. With activation index as target,optimum modification conditions were confirmed as follows：dosage of stearic acid was 2% of the mass of phosphogypsum;modification time was 20 min;modi- fieation temperature was 60 ℃ ,and pH was 7 - 8. Activation index of phosphogypsm reached 100% after modification and it became completely hydrophobie under optimum modification conditions. Unmodified and modified phosphogypsum were both tested with the experiments of extraction and infrared absorption spectrum （ IR ）. Test results showed that the chemical bonds were formed between phosphogypsum and stearic acid. Preliminary industrial experiment results showed that modified phosphogypsum could be used as inorganic filler in PP resin, and its compatibility with PP was better. And mechanical properties of phosphogypsum/PP composite material has increased than that of pure PP.

关 键 词：磷石膏 表面改性 硬脂酸 

分 类 号：TQ132.32[化学工程—无机化工]