Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Acid anhydride low-sensitive polycarboxylic acid water reducing agent as well as preparation method and application thereof
The invention provides an anhydride low-sensitive polycarboxylate superplasticizer as well as a preparation method and application thereof, maleic monoester subjected to alcoholysis of maleic anhydride and ethylene oxide are subjected to ring opening polymerization to prepare an intermediate, carboxyl in maleic ester is esterified by ethylene oxide, part of carboxylic acid is protected, main chain cross-linking is prevented, and the anhydride low-sensitive polycarboxylate superplasticizer is prepared. The quality of the polymer is improved; later-stage precipitation is prevented; the slump retaining performance of the slump retaining agent is further improved by protecting carboxyl through esterification, so that the doping amount of the slump retaining agent in the application process of the water reducing agent is lower, and the effect is more obvious. Compared with the prior art, the high-conversion-rate low-sensitivity viscosity reduction type mother liquor is synthesized through copolymerization of the isopentenol polyoxyethylene ether, the maleic anhydride and the functional monomer of the maleic anhydride, the solid content of a base solution and the use amount of a catalyst are adjusted, so that the high-conversion-rate low-sensitivity viscosity reduction type mother liquor can be subjected to a polymerization reaction at the normal temperature, and the reaction energy consumption at the normal temperature is low. The maleic anhydride functionalized intermediate participates in the free radical polymerization reaction, and the monomer conversion rate of the reaction product is generally higher than 80%.
本发明提供了一种酸酐低敏感型聚羧酸减水剂及其制备方法和应用，使用马来酸酐醇解后马来酸单酯与环氧乙烷开环聚合制备中间体，利用环氧乙烷对马来酸酯中羧基进行酯化，保护一部分羧酸，防止主链交联的产生，进而提高聚合物质量防止后期沉淀的产生；并且通过酯化保护羧基进一步提高其保坍性能，使之在减水剂应用过程中保坍剂掺量更低，效果更明显。与现有技术相比，本发明使用异戊烯醇聚氧乙烯醚与马来酸酐及其功能化单体共聚合成出一种高转化率低敏感降粘型母液，调整底液固含，催化剂用量，使本发明可在常温下发生聚合反应，常温下反应能耗低。本发明使用马来酸酐功能化后中间体参与自由基聚合反应，其反应产物单体转化率普遍高于80％。
Acid anhydride low-sensitive polycarboxylic acid water reducing agent as well as preparation method and application thereof
The invention provides an anhydride low-sensitive polycarboxylate superplasticizer as well as a preparation method and application thereof, maleic monoester subjected to alcoholysis of maleic anhydride and ethylene oxide are subjected to ring opening polymerization to prepare an intermediate, carboxyl in maleic ester is esterified by ethylene oxide, part of carboxylic acid is protected, main chain cross-linking is prevented, and the anhydride low-sensitive polycarboxylate superplasticizer is prepared. The quality of the polymer is improved; later-stage precipitation is prevented; the slump retaining performance of the slump retaining agent is further improved by protecting carboxyl through esterification, so that the doping amount of the slump retaining agent in the application process of the water reducing agent is lower, and the effect is more obvious. Compared with the prior art, the high-conversion-rate low-sensitivity viscosity reduction type mother liquor is synthesized through copolymerization of the isopentenol polyoxyethylene ether, the maleic anhydride and the functional monomer of the maleic anhydride, the solid content of a base solution and the use amount of a catalyst are adjusted, so that the high-conversion-rate low-sensitivity viscosity reduction type mother liquor can be subjected to a polymerization reaction at the normal temperature, and the reaction energy consumption at the normal temperature is low. The maleic anhydride functionalized intermediate participates in the free radical polymerization reaction, and the monomer conversion rate of the reaction product is generally higher than 80%.
本发明提供了一种酸酐低敏感型聚羧酸减水剂及其制备方法和应用，使用马来酸酐醇解后马来酸单酯与环氧乙烷开环聚合制备中间体，利用环氧乙烷对马来酸酯中羧基进行酯化，保护一部分羧酸，防止主链交联的产生，进而提高聚合物质量防止后期沉淀的产生；并且通过酯化保护羧基进一步提高其保坍性能，使之在减水剂应用过程中保坍剂掺量更低，效果更明显。与现有技术相比，本发明使用异戊烯醇聚氧乙烯醚与马来酸酐及其功能化单体共聚合成出一种高转化率低敏感降粘型母液，调整底液固含，催化剂用量，使本发明可在常温下发生聚合反应，常温下反应能耗低。本发明使用马来酸酐功能化后中间体参与自由基聚合反应，其反应产物单体转化率普遍高于80％。
Acid anhydride low-sensitive polycarboxylic acid water reducing agent as well as preparation method and application thereof
一种酸酐低敏感型聚羧酸减水剂及其制备方法和应用
GUI CAN (Autor:in) / QIN YONG (Autor:in) / ZENG JUN (Autor:in) / PAN YUJIE (Autor:in) / FAN SHIMIN (Autor:in) / MENG FANJUN (Autor:in)
31.12.2024
Patent
Elektronische Ressource
Chinesisch
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