超支化减缩剂的合成与性能研究

发布时间：2018-03-30 03:23

本文选题：减缩剂　切入点：超支化聚(胺-酯)　出处：《新型建筑材料》2017年09期

【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。
[Abstract]:In this paper, the precursor monomer N (N) -dihydroxyethyl -3-aminoacrylate was prepared from diethanolamine and methyl acrylate as raw materials, followed by trihydroxymethyl propane as the reaction center nucleus. Hydroxy-terminated hyperbranched poly (Amin-Ester HPAEN) was synthesized by an approved one-step method, followed by the synthesis of small molecule reducer SRAs using succinic anhydride and polyoxyethylene alkyl ether. Finally, the terminal group modification of HPAE was carried out by using small molecule reducer SRA. The hyperbranched shrinkage reducer HPAE-SRA. through the values of IR, hydroxyl, The results show that SRA grafted to the surface of HPAE can reduce the shrinkage of cement mortar by 48.8% and 36.6% respectively for 3 days and 28 days, and the addition of shrinkage reducer can reduce the shrinkage of mortar by 48.8% and 36.6% respectively, and the shrinkage of cement mortar can be reduced by 3 days and 28 days after grafting with HPAE-SRA on the surface of the cement mortar, the results show that the shrinkage reduction rate of the mortar is 48.8% and 36.6% respectively. The influence on the compressive strength of cement mortar is small, The resistance to bending strength is favorable.
【作者单位】：陕西省高性能混凝土工程实验室;陕西铁路工程职业技术学院道桥工程系;
【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)
【分类号】：TU528.042

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