超支化减缩剂的合成与性能研究  

Research on synthesis and performance of hyperbranched shrinkage reducing agent

作　　者：彭磊 何文敏[1,2] 赵亚丽 

机构地区：[1]陕西省高性能混凝土工程实验室,陕西渭南714000 [2]陕西铁路工程职业技术学院道桥工程系,陕西渭南714000

出　　处：《新型建筑材料》2017年第9期74-78,共5页New Building Materials

基　　金：渭南市基础研究人才工程基金项目(2015KYJ-3-3);陕西省高性能混凝土工程实验室专项科研基金(G2015-04)

摘　　要：首先以二乙醇胺和丙烯酸甲酯为原料,制备了前驱单体N,N-二羟乙基-3-胺基丙烯酸甲酯,其次以三羟甲基丙烷为反应中心核,采用有核准一步法合成端羟基超支化聚(胺-酯)(HPAE);然后利用丁二酸酐和聚氧乙烯烷基醚合成小分子减缩剂SRA;最后利用小分子减缩剂SRA对HPAE进行端基改性,得到了超支化减缩剂HPAE-SRA。通过IR、羟值、减缩性能等表征测试表明:小分子减缩剂SRA成功地接枝到了HPAE分子表面;HPAE-SRA可以大幅降低水泥胶砂浆的收缩性能,3 d和28 d的砂浆减缩率分别为48.8%和36.6%;减缩剂的掺入对水泥胶砂的抗压强度影响较小,对抗折强度有利。Hyper branched polymer （amine-ester）with terminal alcohol group（HPAE） was synthesized by polycondensation of N, N-diethyol- （prepared by Michael addition reaction of methyl acrylate with diethanolamine） as precursor monomer with trimethylol propane as the core moiety,proceeding in pseude-one-step procedure. The shrinkage reducing agent SRA was synthesized by the suecinic and polyoxyethylene alkyl ether. Finally,it was modified by SRA to obtain HPAE-SRA hyper branched shrinkage reducing admixture. The obtained polymer was characterized by means of IR,hydroxyl value and shrinkage per- formanee tests,which indicated that micro molecule shrinkage reducing admixture grafted to HPAE successfully. It showed that HPAE-SRA can greatly reduce the shrinkage performance of the cement mortar, at the age of 3 days and 28, days,the shrinkage rate were 48.8% and 36.6% respectively,it had a little negative effect on the cement mortar compressive strength,and had favor- able effect on the flexural strength.

关 键 词：减缩剂 超支化聚(胺-酯) 减缩性能 合成 

分 类 号：TU528.042[建筑科学—建筑技术科学]