聚羧酸系超塑化剂合成及其对水泥基材料性能的影响(英文)  

SYNTHESIS OF POLYCARBOXYLATE-TYPE SUPERPLASTICIZER AND ITS EFFECTS ON THE PERFORMANCE OF CEMENT-BASED MATERIALS

作　　者：李顺[1] 文梓芸[1] 王恒昌[1] 

机构地区：[1]华南理工大学材料科学与工程学院,特种功能材料教育部重点实验室,广州510640

出　　处：《硅酸盐学报》2008年第7期884-889,共6页Journal of The Chinese Ceramic Society

摘　　要：采用酯化工艺合成了一种含聚氧化乙烯基的聚乙二醇单甲醚单甲基丙烯酸酯,以该单体和甲基丙烯酸、2-丙烯酰胺-2-甲基丙磺酸、丙烯酸乙酯、丙烯酰胺等单体合成了聚羧酸系超塑化剂。用红外光谱和凝胶渗透色谱表征了其分子结构及分子量分布,研究了聚羧酸系超塑化剂对水泥基材料的分散性、分散保持能力及抗压强度的影响,用zeta电位法讨论了其分散和分散稳定作用机理。结果表明:所合成的聚羧酸系超塑化剂有利于水泥强度的稳定发展,具有良好的分散保持能力,其分散性及分散保持能力与聚合单体的摩尔比、官能团种类和聚氧化乙烯侧链的长度有关。聚羧酸系超塑化剂的掺量(质量分数)为0.3%时,90min内水泥净浆流动度保持率高达98.1%。A polyethylene glycol methyl ether methyl acrylate （MPEGMA） with polyoxyethylene （PEO） group was synthesized by using an esterification reaction technique. Then, polycarboxylate-type superplasticizers （PCSPs） were synthesized by copolymerization from MPEGMA, methyl acrylic acid （MAA）, 2-acrylamido-2-methylpropanesulfonic acid （AMPS）, ethyl acrylate （EA） and acrylamide （AM）. The molecular structure and molecular mass distribution of the PCSPs were characterized by infrared （IR） spectrum and gel permeation chromatography （GPC）, respectively. The effects of the PCSPs on the dispersibility, dispersion retention stability and compressive strength of cement-based materials were investigated. The mechanisms of dispersion ability and dispersion retention stability of the PCSPs were investigated using the zeta potential method. The results show that the PCSPs are advantageous to the strength development of cement, and have excellent dispersion retention stability. The dispersibility and dispersion retention stability are correlated with the mole ratio of polymerized monomers, the type of functional groups and the length of the PEO side chain. The fluidity retention ratio of the cement paste by minislump spread test with 0.3% （in mass） PCSPs reached 98.1% in 90 rain.

关 键 词：聚羧酸系超塑化剂 合成参数 分子量及其分布 分散性 分散保持能力 

分 类 号：TU528.2[建筑科学—建筑技术科学]