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机构地区:[1]陕西化建工程有限公司,陕西兴平711300 [2]陕西省石油化工研究设计院,陕西西安710054
出 处:《应用化工》2014年第9期1656-1659,共4页Applied Chemical Industry
摘 要:采用聚醚(TPEG)、甲基丙烯酸(MAA)为单体,以过氧化氢为引发剂,十二硫醇为分子量调节剂,在水溶液中共聚合成聚醚接枝的聚羧酸系减水剂。考察了单体摩尔比、引发剂用量、分子量调节剂量、聚合温度及聚合时间等因素对聚醚减水剂分散性能的影响。结果表明,最佳合成工艺条件为:n(MAA): n(TPEG): n(十二硫醇): n(双氧水)=11.20:2.72:0.36:0.20,引发剂用量为单体总质量的0.3%,分子量调节剂占单体总质量的1.0%,反应温度65℃,反应时间4~5 h。在此条件下,合成的减水剂使水泥净浆流动度达到250 mm,对水泥具有良好的分散性。Polyether superplasticizer was synthesized in the water solution by using polyether(TPEG), methacrylic acid(MAA)as monomers,hydrogen peroxide as initiator,dodecyl mercaptan as molecular weight regulator. The influence of molar ratio of monomers,solicitation agents amount,the dosage of dode-cyl mercaptan,the reaction time,and the reaction temperature were discussed. The result showed that the optimal synthesis conditions were determined:n(MAA): n(TPEG): n(dodecanethiol): n(hydrogen per-oxide)= 11. 20: 2. 72: 0. 36: 0. 20,the initiator dosage was 0. 3% of the monomer weight,the dodecyl mercaptan dosage was 1. 0% of the monomer weight,the reaction temperature was 65 ℃ and the reaction time was 4 ~ 5 h. When the cement paste fluidity could reach 250 mm,it had better dispersing ability for cement.
分 类 号:TQ325.6[化学工程—合成树脂塑料工业]
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