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发明公开
CN106977655A 一种聚羧酸系减水剂及其合成方法和用途 无效 - 撤回

一种聚羧酸系减水剂及其合成方法和用途
摘要：
本发明公开了一种基于聚乙烯基吡咯烷酮合成的新型聚羧酸系减水剂及其合成方法和用途，聚羧酸系减水剂的结构如式I所示，其合成方法包括以下步骤：将聚乙烯基吡咯烷酮、次磷酸钠和丙烯酸溶解于去离子水中，制得滴加液A；将引发剂过硫酸铵溶解于去离子水中，制得滴加液B；将滴加液A和B滴入反应装置中，然后保温反应1～2小时，最后用碱液中和产物至产物pH值为5.0～7.8，得到所述的聚羧酸系减水剂。本发明制备出的新型聚羧酸系减水剂减水效果良好、成本较低，无论是在制备聚乙烯基吡咯烷酮过程中还是在合成减水剂过程中，使用到的溶剂只有水，所以在该新型聚羧酸系减水剂生产过程中，无论是对生产人员和环境都不会造成任何危害。
摘要（英）：

The invention discloses a novel polycarboxylate-type water reducer synthesized based on polyvinyl pyrrolidone as well as a synthetic method and applications thereof. The structure of the polycarboxylate-type water reducer is shown in a formula I, and the synthetic method comprises the following steps: polyvinyl pyrrolidone, sodium hypophosphite, and acrylic acid are dissolved in deionized water, and dropwise adding liquid A is prepared; an initiator ammonium persulfate is dissolved in deionized water, and dropwise adding liquid B is prepared; the dropwise adding liquid A and the dropwise adding liquid B are added into a reaction apparatus dropwise, a reaction with insulation is carried out for 1-2 hours, finally alkali liquor is used for product neutralization till the pH value of the product is 5.0-7.8, and the polycarboxylate-type water reducer is obtained. The novel polycarboxylate-type water reducer has good water reducing effects and low cost; in the processes of preparation of polyvinyl pyrrolidone and synthesis of the water reducer, only water is used as the solvent, so that the production process of the novel polycarboxylate-type water reducer does not cause any harm to production personnel and environment.

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