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新型聚醚EPEG常温制备保坍型聚羧酸高性能减水剂

作者：周普玉1，王丽秀1，张智达1，李娟1，王江亮2

关键字：新型,聚醚,EPEG,常温,制备,保坍型,聚,羧酸,

　
（1.山西佳维新材料股份有限公司，山西 太原  030000；2.中铁北京工程局集团有限公司，北京  100000）
摘要：采用新型聚醚（EPEG）、丙烯酸、保坍功能小单体、L-抗坏血酸、双氧水、巯基乙酸为主要原料，于常温合成保坍型聚羧酸高性能减水剂（EBT-01）。通过与采用不同醚合成的保坍型聚羧酸减水剂对比结果表明，该新型聚醚（EPEG）具有活性高、合成的产品性能好且稳定等优点。水泥净浆流动度及混凝土试验结果表明，其最佳合成工艺为：常温条件下，酸醚比2.5，酯醚比3.0，引发剂、链转移剂用量分别为单体总质量0.28%、0.45%，滴加时间1 h，滴加结束后于15～35 ℃保温反应0.5 h。将EBT-01与通用减水型聚羧酸高性能减水剂按m（EBT-01）∶m（PC-01）＝4∶6进行复配时，混凝土2 h坍落度基本无损失。 
关键词：新型聚醚（EPEG）；高活性；常温合成；高保坍
中图分类号：TU528.042+.2        文献标识码：A        文章编号：1001-702X（2019）06-0131-04
 
Synthesis and properties of high performance slump-retaining type polycarboxylate superplasticizer with polyether EPEG at room temperature
ZHOU Puyu1，WANG Lixiu1，ZHANG Zhida1，LI Juan1，WANG Jiangliang2
（1.Shanxi Jiawei New Material Co. Ltd.，Taiyuan 030000，China；
2.China Railway Beijing Engineering Bureau Group Co. Ltd.，Beijing 100000，China）
Abstract：In this paper，high performance slump-retaining type polycarboxylate superplasticizer（EBT-01） was synthesized by
using the new polyether，acrylic acid，slump-protecting small monomer，L-ascorbic acid，hydrogen peroxide，and thioglycolic acid as the main raw materials under normal temperature conditions. The new polyether（EPEG） has the advantages of high activity，good performance and stability of the synthesized product by comparison with a lanthanum-type polycarboxylate superplasticizer synthesized by using different ethers. The cement paste fluidity and concrete test results show that the optimal synthesis process parameters are：at room temperature，the ratio of acid to ether is 2.5，the ratio of ester to ether is 3.0，and the amount of initiator and chain transfer agent is 0.28% and 0.45% of total monomer mass respectively，the dropping time is 1 h and the insulation time is 0.5h. The EBT-01 is compounded with the universal high performance polycarboxylate superplasticizer（PC-01） at the ratio of
m（EBT-01）∶m（PC-01）＝4∶6，the 2 h slump of concrete measured at this time has basically no loss.
Key words：new polyether（EPEG），high activity，synthesis under room temperature，high slump-retaining