A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The invention discloses a preparation method of an early-strength polycarboxylate superplasticizer, which comprises the following steps: dissolving a polyether monomer in water, adding hydrogen peroxide, and controlling the temperature of the reaction system at 2-8 DEG C; dropwise adding an aqueous solution A containing acrylic acid, sodium methallyl sulfonate and acrylamide, an aqueous solution Bcontaining mercaptopropionic acid and sodium formaldehyde sulfoxylate and a ferrous sulfate aqueous solution into the reaction system; adding a proper amount of sodium methallyl sulfonate into the reaction system, so that the early strength performance of the water reducing agent can be effectively improved; and after dropwise adding is finished, heating the reaction system to 40-50 DEG C, keeping the temperature for 2-2.5 hours, and then adjusting the pH value to 5-7 to obtain the early-strength polycarboxylate superplasticizer. By controlling the formula of the water reducing agent, the combination mode of dropwise adding reaction raw materials, the dropwise adding time and the reaction temperature, the polyether monomer, acrylic acid and other functional small monomers can be slowly and uniformly polymerized in the reaction process, and the adsorption performance and water reducing performance of synthesized water reducing agent molecules on cement are guaranteed.
本发明公开了一种早强型聚羧酸减水剂的制备方法，包括以下步骤：将聚醚单体溶解于水中，加入双氧水，将反应体系的温度控制在2‑8℃；同时向反应体系中滴加含有丙烯酸、甲基丙烯磺酸钠、丙烯酰胺的水溶液A，含有巯基丙酸、甲醛合次硫酸氢钠的水溶液B及硫酸亚铁水溶液；在反应体系中加入适量的甲基丙烯磺酸钠能有效提升减水剂的早强性能；滴加完毕后，将反应体系升温至40‑50℃保温2～2.5h，然后调节pH至5‑7，即可得到所述早强型聚羧酸减水剂；本发明通过控制减水剂的配方、反应原料滴加时的组合方式、滴加时间、反应温度，使聚醚单体与丙烯酸以及其他功能的小单体在反应时能缓慢均匀聚合，保证合成减水剂分子对水泥的吸附性能与减水性能。
The invention discloses a preparation method of an early-strength polycarboxylate superplasticizer, which comprises the following steps: dissolving a polyether monomer in water, adding hydrogen peroxide, and controlling the temperature of the reaction system at 2-8 DEG C; dropwise adding an aqueous solution A containing acrylic acid, sodium methallyl sulfonate and acrylamide, an aqueous solution Bcontaining mercaptopropionic acid and sodium formaldehyde sulfoxylate and a ferrous sulfate aqueous solution into the reaction system; adding a proper amount of sodium methallyl sulfonate into the reaction system, so that the early strength performance of the water reducing agent can be effectively improved; and after dropwise adding is finished, heating the reaction system to 40-50 DEG C, keeping the temperature for 2-2.5 hours, and then adjusting the pH value to 5-7 to obtain the early-strength polycarboxylate superplasticizer. By controlling the formula of the water reducing agent, the combination mode of dropwise adding reaction raw materials, the dropwise adding time and the reaction temperature, the polyether monomer, acrylic acid and other functional small monomers can be slowly and uniformly polymerized in the reaction process, and the adsorption performance and water reducing performance of synthesized water reducing agent molecules on cement are guaranteed.
本发明公开了一种早强型聚羧酸减水剂的制备方法，包括以下步骤：将聚醚单体溶解于水中，加入双氧水，将反应体系的温度控制在2‑8℃；同时向反应体系中滴加含有丙烯酸、甲基丙烯磺酸钠、丙烯酰胺的水溶液A，含有巯基丙酸、甲醛合次硫酸氢钠的水溶液B及硫酸亚铁水溶液；在反应体系中加入适量的甲基丙烯磺酸钠能有效提升减水剂的早强性能；滴加完毕后，将反应体系升温至40‑50℃保温2～2.5h，然后调节pH至5‑7，即可得到所述早强型聚羧酸减水剂；本发明通过控制减水剂的配方、反应原料滴加时的组合方式、滴加时间、反应温度，使聚醚单体与丙烯酸以及其他功能的小单体在反应时能缓慢均匀聚合，保证合成减水剂分子对水泥的吸附性能与减水性能。
Preparation method of early-strength polycarboxylate superplasticizer
一种早强型聚羧酸减水剂的制备方法
ZHANG LEI (author)
2020-10-23
Patent
Electronic Resource
Chinese
| European Patent Office | 2016
| European Patent Office | 2016
| European Patent Office | 2016
| European Patent Office | 2015