摘要
以甲基烯丙基聚氧乙烯醚(TPEG)、2-丙烯酰胺-2-甲基丙磺酸(AMPS)、丙烯酸(AA)为主要原料合成了聚羧酸系减水剂。通过正交实验研究了单体配比、引发剂用量等因素对聚羧酸系减水剂分散性能的影响。结果表明,最佳单体配比为:n(AA)∶n(TPEG)∶n(AMPS)=3∶1∶0.15,引发剂过硫酸铵(APS)用量为TPEG质量的0.25%。在最佳配比条件下,考察了反应时间和反应温度对聚羧酸系减水剂性能的影响。在70℃下反应5 h,减水剂对硬石膏的分散性能最佳,硬石膏的初始和2 h的净浆流动度分别为263 mm和255mm,表现出较好的缓凝效果。
The polycarboxylic series of water reducer was synthesized by using methyl allyl polyethenoxy ether（TPEG）,acrylic acid （AA） and 2-acrylamido-2-methyipropanesulfonate sulium （AMPS） as the main materials. Influence of factors of monomer mole ratio, initiator weight on the performances of polycarboxylic water reducer was researched by orthogonal experiment design. Results show that n （AA） ：n （TPEG） ：n （AMPS） =3：1：0.15, initiator （Ammonium persulfate, APS） weight is 0.25% of TPEG weight, the polycarboxylie water reducer has the optimum dispersity performance. Under the above condltlon,we studied the effects of the reaction time and reaction temperature on the performance of polycarboxylic water reducer. The dispersity performance of polycarboxylic water reducer is the best when the reaction temperature is 70℃ and reaction time is 5 hours. The initial paste fluidity reaches 263 mm and the paste fluidity at two hours reaches 255 ram. The polycarboxylic water reducer has better control-release effect.
出处
《新型建筑材料》
北大核心
2015年第12期63-65,73,共4页
New Building Materials
基金
国家自然科学基金项目(51272068)
关键词
硬石膏
聚羧酸系减水剂
分散性
缓凝
anhydrite,polycarboxylate superplasticizers,dispersity,control-released
