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本体聚合法制备新型粉体早强型聚羧酸减水剂

作者:刘巧玲1,邵琪1,宋沛霖1,逄鲁峰1,2,常青山2,付鹏2,王敏2,郎慧东2

关键字:本体,聚,合法,制备,新型,粉体,早强型,羧酸,减,

 
(1.山东建筑大学 土木工程学院,山东 济南  250100;2.山东华迪建筑科技有限公司,山东 济阳  251400)
摘要:采用本体聚合法,以实验室自制聚醚类大单体HD-5000、丙烯酸(AA)、N,N-二甲基丙烯酰胺(DMAA)为聚合单体,巯基乙酸(TGA)为链转移剂,通过高温分解偶氮二异丁酸二甲酯(AIBME)提供自由基引发聚合反应,合成一种新型粉体早强聚羧酸减水剂PC-Z。通过正交和单因素试验研究了反应温度、引发剂投料方式、链转移剂用量以及引发剂用量对PC-Z性能的影响。结果表明,酸醚比为4,DMAA用量为聚醚类大单体质量的40%时,PC-Z具有最佳的分散性和早强性,PC-Z能明显提高水泥砂浆的早期强度,并且具有较好的水泥适应性。
关键词:本体聚合;粉体聚羧酸减水剂;早强型
中图分类号:TU528.042+.2        文献标识码:A        文章编号:1001-702X(2019)08-0001-04
 
Preparation of early-strength powder polycarboxylic acid superplasticizer by bulk polymerization
LIU Qiaoling1,SHAO Qi1,SONG Peilin1,PANG Lufeng1,2,CHANG Qingshan2,FU Peng2,WANG Min2,LANG Huidong2
(1.School of Civil Engineering,Shandong Jianzhu University,Jinan 250100,China;
2.Shandong Huadi Construction Technology Co. Ltd.,Jiyang 251400,China)
Abstract:A new early-strength powder polycarboxylic acid superplasticizer was synthesized with self-made HD-5000,acrylic acid(AA),N,N-dimethyl acrylamide(DMAA) as monomers and with thioglycolic acid(TGA) as chain transfer agent through high
temperature decomposition azo 2 isobutytic acid dimethyl(AIBME) by the method of bulk polymerization. Through orthogonal test
analysis and single factor analysis,the effects of the reaction temperature,initiator feeding way,dosage of chain transfer agent and dosage of initiator on the properties of Polycarboxylic-Z(PC-Z) were stuided. The experimental results show that PC-Z has the
best dispersive performance and early strength performance when the ratio of acid ether is 4 and the dosage of DMAA is 40%. PC-Z can obviously improve the early strength of cement mortar and has good adaptability of cement. 
Key words:bulk polymerization,powder polycarboxylic acid superplasticizer,early-strength