高性能改性密胺减水剂的研究与开发

Study and development of modified Melamine superplasticizer with high performance

采用对氨基苯磺酸钠替代传统的亚硫酸盐作为磺化剂,制得的改性密胺减水剂克服了传统密胺减水剂减水率偏低、保坍性能差等缺点,并且对泥土含量的敏感性大大降低。使用对氨基苯磺酸钠制备密胺减水剂的合成工艺由传统的"四步法"改进为"三步法",操作更为简单可控。通过对比亚硫酸盐和对氨基苯磺酸钠2种磺化剂所制备密胺减水剂的性能,分别对合成过程中的磺化剂用量进行了系统的探索研究。与萘系、脂肪族、氨基磺酸盐系等缩聚型减水剂的性能对比,改性密胺减水剂具有优异的分散和分散保持性能。

Amino benzene sulfonic acid sodium salt is selected as the sulfonating agent instead of sulfite to synthesize the modified melamine superplasticizer. The modified melamine superplastieizer overcomes the drawbacks of traditional melamine superplasticizer such as low water reducing rate and poor dispersion retention ability. And the sensibility to clay content is significantly reduced. The melamine superplasticizer synthesis process using amino benzene sulfonic acid sodium salt is changed from the traditional ＂four steps＂ to ＂three steps＂, the operation is much simple and controllable. Through comparing the properties of melamine superplasticizer prepared by sulfite and amino benzene sulfonic acid sodium salt, the dosage of the sulfonating agents in the synthesis process has been systematically studied. By comparing with the naphthalene series water reducing agent,aiphatic water reducer, amino sulfonate superplasticizer and traditional melamine superplasticizer, the modified melamine superplasticizer presents excellent dispersion and dispersion retention abilities.