Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation methods of alkaline polyether monomer and polycarboxylate water reducer
The invention relates to the technical field of concrete admixtures, and in particular, relates to preparation methods of a polyether monomer and a polycarboxylate water reducer. The polyether monomeris prepared by the following method: 1) in the presence of a basic catalyst, reacting an unsaturated compound with at least one active hydrogen atom with alkylene oxide to obtain an alkoxylation product I; and 2) in the presence of a basic catalyst, reacting the alkoxylation product I with alkylene oxide to obtain an alkoxylation product II, wherein the reaction temperature of the alkoxylation product I and alkylene oxide in the step 2) is 25 DEG C or above. The polyether monomer prepared by the method disclosed by the invention has good polymerization activity and high double bond retentionrate, has lower synthesis temperature than common polyether monomers, can be stored and used for a long time without neutralization, and simplifies the synthesis process steps of the polyether monomer.
本发明涉及混凝土外加剂的技术领域，特别涉及到一种聚醚单体及聚羧酸减水剂的制备方法。所述聚醚单体采用如下方法制备：1)在碱性催化剂的存在下，使具有至少一个活性氢原子的不饱和化合物与烯化氧反应，得到烷氧基化产物I；2)在碱性催化剂的存在下，将烷氧基化产物I与烯化氧反应，得到烷氧基化产物II；其中，步骤2)中烷氧基化产物I与烯化氧的反应温度在25℃以上。本发明的方法制备得到的聚醚单体具有很好的聚合活性，高的双键保留率，比普通聚醚单体更低合成温度，不需要中和便可长期保存使用，简化了聚醚单体合成工艺步骤。
Preparation methods of alkaline polyether monomer and polycarboxylate water reducer
The invention relates to the technical field of concrete admixtures, and in particular, relates to preparation methods of a polyether monomer and a polycarboxylate water reducer. The polyether monomeris prepared by the following method: 1) in the presence of a basic catalyst, reacting an unsaturated compound with at least one active hydrogen atom with alkylene oxide to obtain an alkoxylation product I; and 2) in the presence of a basic catalyst, reacting the alkoxylation product I with alkylene oxide to obtain an alkoxylation product II, wherein the reaction temperature of the alkoxylation product I and alkylene oxide in the step 2) is 25 DEG C or above. The polyether monomer prepared by the method disclosed by the invention has good polymerization activity and high double bond retentionrate, has lower synthesis temperature than common polyether monomers, can be stored and used for a long time without neutralization, and simplifies the synthesis process steps of the polyether monomer.
本发明涉及混凝土外加剂的技术领域，特别涉及到一种聚醚单体及聚羧酸减水剂的制备方法。所述聚醚单体采用如下方法制备：1)在碱性催化剂的存在下，使具有至少一个活性氢原子的不饱和化合物与烯化氧反应，得到烷氧基化产物I；2)在碱性催化剂的存在下，将烷氧基化产物I与烯化氧反应，得到烷氧基化产物II；其中，步骤2)中烷氧基化产物I与烯化氧的反应温度在25℃以上。本发明的方法制备得到的聚醚单体具有很好的聚合活性，高的双键保留率，比普通聚醚单体更低合成温度，不需要中和便可长期保存使用，简化了聚醚单体合成工艺步骤。
Preparation methods of alkaline polyether monomer and polycarboxylate water reducer
一种碱性聚醚单体及聚羧酸减水剂的制备方法
LI HUAWEI (Autor:in) / ZHAO YUYANG (Autor:in) / GUO XIAOFENG (Autor:in) / NIU FENG (Autor:in) / CHEN YANG (Autor:in) / ZHANG JUN (Autor:in) / LI LEI (Autor:in) / LI FANG (Autor:in)
08.09.2020
Patent
Elektronische Ressource
Chinesisch
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