摘要
将磷钨酸原位包埋在SiO2的三维网络中,制备得到SiO2负载磷钨酸催化剂(PW12/SiO2);在该催化剂作用下以甲氧基聚乙二醇和甲基丙烯酸为原料合成了甲氧基聚乙二醇甲基丙烯酸酯;通过正交实验确定了优化条件:n(AA)/n(PEG)=3,催化剂质量分数为1%(以醇酸总质量计),阻聚剂质量分数1%(以醇酸总质量计),酯化时间10 h,在该条件下,酯化率达93.6%,产率为83.46%。在高负载量下,磷钨酸在载体上仍然高度分散且没有晶相堆积,反应中催化剂活性组分溶脱量少,催化剂重复使用6次,催化活性未明显降低。
Methoxy polyethylene glycol methacrylate-styrene polymer was synthesized with phosphotungstic acid supported on silica（PW12/SiO2）.The catalyst was prepared by putting tungstophosphoric acid into the three dimensional structure of silica.The optimized conditions for the esterification were determined with orthogonal experiments as：molar ratio of methoxy polyethylene glycol to methacrylic acid was 1∶3,amount of catalyst and inhibitor were 1% and 1%,respectively（according to the mass of PEG and acrylic acid）,reaction time was 10 h,the esterification rate could reach 93.6% and the yield was up to 83.46%.Under high loading amount,phosphotungstic acid has a great degree of dispersion on silica,and without surface packing of bulk phosphotungstic acid.The catalyst has a low desorption on the reaction and still has a excellent catalytic efficiency after using six times.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2011年第1期93-96,共4页
Fine Chemicals
基金
江苏省高等学校科技创新团队资助项目(苏教科[2007]5号)~~
关键词
甲氧基聚乙二醇丙烯酸酯
负载磷钨酸
催化剂
酯化率
精细化工中间体
methoxy polyethylene glycol methacrylate
supported phosphotungstic acid
catalyst
esterification rate
fine chemical intermediates
