早强快凝型聚羧酸减水剂的制备与表征

Preparation and characterization of early strength and fast-setting polycarboxylate superplasticizer

采用异丁烯聚氧乙烯基醚(HPEG-4000)、丙烯酸(AA)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)和丙烯酰氧乙基三甲基氯化铵(DAC)等主要原材料,通过自由基溶液聚合制备早强快凝型聚羧酸减水剂。通过正交试验进行工艺优化,确定最佳工艺配方。采用红外光谱和凝胶渗透色谱对其结构进行表征,并对产品的性能进行测试。结果表明,该减水剂的最佳单体用量为:DAC、AMPS、SHS、TGA用量分别为聚醚大单体质量的2.0%、1.5%、1.5%、1.15%。该减水剂对水泥的水化具有促进作用,缩短水泥的凝结时间,提高早期强度,可以替代国外同类产品。

The early strength and fast-setting polycarboxylate superplasticizer are prepared by free radical solution polymerization,and was synthesized by Isobutylene polyoxyethylene ether(HPEG-4000),acrylic acid(AA),2-acrylamido-2-methylpropanes- ulfonic acid(AMPS) and 2-(acryloyloxy) ethyl trimethylammonium chloride(DAC). Process optimization is performed by orthogonal experiments to determine the optimum process recipe. The structure was characterized by infrared spectroscopy and gel permeation chromatography,and the properties of the product were tested. The test results show that the optimal process of the water reducing agent is:the amount of DAC,AMPS,SHS and TGA is 2%,1.5%,1.5% and 1.15% of the mass of polyether macromonomer respectively. The use of the early strength water reducing agent promotes the hydration of the cement, shortens the setting time,improves the early strength,and can replace the foreign similar products.