新型混凝土聚羧酸类高性能减水剂的合成与表征研究  

Synthesis and characterization on macromonnomer of new polycarboxylate-type high performance superplasticizer for concrete

作　　者：莫祥银[1] 景颖杰[1] 姚杰[1] 邓敏[2] 唐明述[2] 

机构地区：[1]南京师范大学分析测试中心和江苏省生物功能材料重点实验室,江苏南京210097 [2]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《混凝土》2009年第2期80-83,共4页Concrete

基　　金：江苏省自然科学基金项目(2007191SB90098);南京师范大学留学回国人员科研启动基金项目(2006191XLH0132);德意志学术交流基金项目(DAAD Section 423-China,Mongolia)

摘　　要：讨论了新型混凝土聚羧酸类高性能减水剂的中间大分子单体——聚乙二醇甲基丙烯酸酯的合成。通过对不同分子量的聚乙二醇与甲基丙烯酸在不同摩尔比、不同反应温度、不同阻聚剂掺量、不同催化剂掺量、不同反应时间等试验条件下的研究,确定了聚乙二醇分子量为1000、酸醇摩尔比为1.2:1、反应温度为100℃、阻聚剂掺量为0.8%、催化剂掺量为3%、反应时间为6h的甲基丙烯酸全连续滴加的最佳酯化工艺,酯化率为95%以上。此外,通过傅里叶变换红外光谱对大分子单体进行了表征,结果表明已得到预期结构的聚乙二醇单甲基丙烯酸酯大分子单体。Synthesis ofpoly-carboxylic acid water reducer intermediate macromonomer-PEA was discussed.Experiment conditions ofpolyethylene glycol with different molecular weights and acrylic acid under different molar ratios,reaction temperatures,polymerization inhibitor contents, catalyst contents,and reaction time were studied and it was determined to adopt acrylic acid all continuous drip feed esterification process,molecular weight of polyethylene glycol 1 000, molar ratio of acid alcohol 1.2：1, reaction temperature 100℃ ,polymerization inhibitor content 0.8% ,catalyst content 3% ,and reaction time 6 hours,an ideal PEA with esterification rate about 95% could be obtained.In addition,the macromonomer characterization was analyzed by FT-IR.The results show that the macromonomer with polymer structure was obtained assuredly.

关 键 词：混凝土 聚羧酸类减水剂 大分子单体 酯化工艺 傅里叶红外光谱 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]