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发明公开
CN102115516A 梳形共聚物水泥分散剂的制备方法、所用单体及所得梳形共聚物水泥分散剂 无效 - 撤回

梳形共聚物水泥分散剂的制备方法、所用单体及所得梳形共聚物水泥分散剂
摘要：
本发明涉及梳形共聚物水泥分散剂的制备方法、所用单体及所得梳形共聚物水泥分散剂，所述梳形共聚物水泥分散剂的制备方法为，由单体a和b在水性介质中发生自由基共聚反应，其中单体a用通式(I)表示：单体b用通式(II)表示。优选单体a和b的摩尔比为1∶(1～10)。上述制备方法所得的梳形共聚物水泥分散剂的结构式如(VI)所示。本发明在梳型共聚物水泥分散剂中引入新的单体a，该单体分子结构中具有不饱和活性双键和两条支化聚氧化烯长链，能极大增强水泥颗粒之间的空间位阻作用，提高水泥的分散稳定性。该分散剂制备方法简单，生产操作方便，同时所得梳形水泥分散剂具有掺量低、分散性好、减水率高、坍落度损失小、本体含气量低的优点。
摘要（英）：

The invention relates to a preparation method for a comb-shaped copolymer cement dispersant, a monomer used in the comb-shaped copolymer cement dispersant and the prepared comb-shaped copolymer cement dispersant. The preparation method for the comb-shaped copolymer cement dispersant comprises the following steps: a monomer (a) and a monomer (b) are subjected to free-radical copolymerization in aqueous medium, wherein the monomer (a) is expressed with a general formula (I), and the monomer (b) is expressed with a general formula (II); and the mol ratio of the monomer (a) and the monomer (b) is preferably 1:(1 to 10). The structure formula of the comb-shaped copolymer cement dispersant obtained by the preparation method is shown in (VI). The new monomer (a) is introduced in the comb-shaped copolymer cement dispersant, and the molecular structure of the monomer (a) has an unsaturated reactive double bond and two branching polyoxyalkylene long chains, so that the steric hindrance among cement particles can be greatly enhanced, and the dispersion stability of cement can be enhanced. The preparation method for the comb-shaped copolymer cement dispersant is simple and convenient for production operation, and meanwhile, the prepared comb-shaped copolymer cement dispersant has the advantages of low dosage, good dispersivity, high water-reducing rate, small slump loss and low gas content.

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