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Nano RAFT (reversible addition-fragmentation chain transfer) reagent, preparation method thereof and application of nano RAFT reagent in polycarboxylate superplasticizer
The invention provides a nano RAFT (Reversible Addition-Fragmentation Chain Transfer) reagent, a preparation method thereof and application of the nano RAFT reagent in a polycarboxylic acid water reducer, alkyl trimethyl ammonium chloride is used as a surfactant micelle template, under an alkaline heating condition, orthosilicate and organic alkoxy silane are subjected to a co-condensation reaction, and nano silicon dioxide particles coated with the RAFT reagent on the surface, namely the nano RAFT reagent, are generated. The polyether macromonomer and the unsaturated acid are adopted as reaction monomers, free radical polymerization is initiated through a redox system, the synthesized nano RAFT reagent is used as a special chain transfer agent, and the synthesized polycarboxylate superplasticizer has high early strength performance and excellent dispersing performance and achieves an excellent application effect in concrete tests.
本发明提供了一种纳米RAFT试剂及其制备方法和在聚羧酸减水剂的应用，以烷基三甲基氯化铵为表面活性剂胶束模板，在碱性加热条件下，正硅酸酯类与有机烷氧基硅烷发生共缩合反应，生成表面包覆着RAFT试剂的纳米二氧化硅颗粒，即纳米RAFT试剂。本发明采用聚醚大单体、不饱和酸作为反应单体，通过氧化还原体系引发自由基聚合反应，使用合成的纳米RAFT试剂作为特种链转移剂，合成的聚羧酸减水剂具有较强的早强性能以及优异的分散性能，在混凝土试验中取得了优异的应用效果。
Nano RAFT (reversible addition-fragmentation chain transfer) reagent, preparation method thereof and application of nano RAFT reagent in polycarboxylate superplasticizer
The invention provides a nano RAFT (Reversible Addition-Fragmentation Chain Transfer) reagent, a preparation method thereof and application of the nano RAFT reagent in a polycarboxylic acid water reducer, alkyl trimethyl ammonium chloride is used as a surfactant micelle template, under an alkaline heating condition, orthosilicate and organic alkoxy silane are subjected to a co-condensation reaction, and nano silicon dioxide particles coated with the RAFT reagent on the surface, namely the nano RAFT reagent, are generated. The polyether macromonomer and the unsaturated acid are adopted as reaction monomers, free radical polymerization is initiated through a redox system, the synthesized nano RAFT reagent is used as a special chain transfer agent, and the synthesized polycarboxylate superplasticizer has high early strength performance and excellent dispersing performance and achieves an excellent application effect in concrete tests.
本发明提供了一种纳米RAFT试剂及其制备方法和在聚羧酸减水剂的应用，以烷基三甲基氯化铵为表面活性剂胶束模板，在碱性加热条件下，正硅酸酯类与有机烷氧基硅烷发生共缩合反应，生成表面包覆着RAFT试剂的纳米二氧化硅颗粒，即纳米RAFT试剂。本发明采用聚醚大单体、不饱和酸作为反应单体，通过氧化还原体系引发自由基聚合反应，使用合成的纳米RAFT试剂作为特种链转移剂，合成的聚羧酸减水剂具有较强的早强性能以及优异的分散性能，在混凝土试验中取得了优异的应用效果。
Nano RAFT (reversible addition-fragmentation chain transfer) reagent, preparation method thereof and application of nano RAFT reagent in polycarboxylate superplasticizer
一种纳米RAFT试剂及其制备方法和在聚羧酸减水剂的应用
ZHU XUERUI (author) / CHEN FENG (author) / WANG YU (author) / JIANG DACHAO (author) / QIAN SHANSHAN (author) / SONG NANJING (author) / SI HONGZHEN (author) / HUANG WEIXING (author) / WEN LIXIN (author) / ZHAO YAN (author)
2024-06-14
Patent
Electronic Resource
Chinese
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