聚羧酸大分子的合成及其对石膏强度的影响  

Synthesis of Polycarboxylate Macromolecules and Their Effect on the Strength of Gypsum

作　　者：万秀琴 徐泽跃[2] 徐建华[2] 曹峰[2] 夏咏梅 

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214122 [2]江苏省陶瓷研究所有限公司,江苏宜兴214221

出　　处：《精细化工》2013年第1期113-116,共4页Fine Chemicals

基　　金："十二五"国家科技支撑计划资助项目(2011BAE30B00)~~

摘　　要：以丙烯酸、丙烯酸甲酯、甲基丙烯磺酸钠及烯丙基聚氧乙烯醚为原料,过硫酸铵为引发剂,进行水相自由基共聚反应合成醚型聚羧酸大分子。合成产物对石膏具有明显的缓凝作用。加入质量分数0.2%(以石膏质量计)的合成产物改性的石膏块,养护时间为24 h时,其抗折及抗压强度比纯石膏分别提高31.1%和32.6%,吸水率比纯石膏降低了9.1%。Polycarboxylate macromolecules were synthesized through radical aqueous solution polymerization, using acrylic acid, methacrylate, sodium methallyl sulfonate and allyl polyoxyethylene ether as starting materials, and ammonium persulphate as initiator. The polycarboxylate prolonged the gypsum plaster＇s setting time. The plasters containing 0. 2% polycarboxylate presented an increase of bending strength and compressive strength by 31.1% and 32.6% in 24 h, respectively. The water absorption rate of the modified piaster was 9. 1% lower than that of pure plaster.

关 键 词：聚羧酸大分子 模具 石膏 抗压强度 抗折强度 吸水率 建筑用化学品 

分 类 号：TQ317.9[化学工程—高聚物工业]