聚羧酸减水剂的常温合成工艺

发布时间：2018-03-16 14:48

  本文选题：聚羧酸减水剂　切入点：异戊烯醇聚氧乙烯醚　出处：《化工进展》2016年11期 　论文类型：期刊论文

【摘要】：目前聚羧酸减水剂的合成工艺主要以加热为主,低温合成工艺报道较少。本文为了解决这一问题,以异戊烯醇聚氧乙烯醚(TPEG)、丙烯酸(AA)为主要聚合单体,研究分析反应温度、保温时间、A/B液滴加时间、酸醚比、引发剂过硫酸铵用量(APS)等因素对合成减水剂产品性能的影响。并利用正交试验,筛选出常温条件下较优的合成工艺:酸醚比n(AA)∶n(TPEG)=3.5∶1,引发剂过硫酸铵用量(按TPEG单体质量分数计)为0.5%,反应温度30℃,A液滴加2.25h,B液滴加3.5h,保温时间1.5h。合成减水剂产品在水灰比0.29,掺量0.25%的条件下,水泥净浆初始流动度达到240mm,1h后净浆流动度损失5mm,相同掺量下与其他减水剂产品相比具有更好的分散性和分散保持性。
[Abstract]:At present, the synthesis process of polycarboxylic acid water reducer is mainly heated, but less reported at low temperature. In order to solve this problem, isopentenol polyoxyethylene ether (TPEG), acrylic acid (AAA) was used as the main polymerization monomer, and the reaction temperature was studied and analyzed. The effects of different factors, such as the time of adding A / B droplet, the ratio of acid to ether, the amount of ammonium persulfate initiator and so on, on the properties of the synthetic superplasticizer were studied by orthogonal test. The optimum synthetic conditions were as follows: the ratio of acid to ether was 3.5: 1, the amount of ammonium persulfate (based on the mass fraction of TPEG monomer) was 0.5, the reaction temperature was 30 鈩，

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