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Polyether macromonomer, preparation method and application of polyether macromonomer in polycarboxylate superplasticizer
The invention provides a polyether macromonomer, a preparation method and application of the polyether macromonomer in a polycarboxylate superplasticizer, firstly, an initiator is added into a reaction kettle for bottoming, under the nitrogen protection working condition, a catalyst is added for reaction, and an activated initiator is obtained; transferring the activated initiator into a reaction device, heating, starting alkylene oxide feeding and reaction, and continuously feeding alkylene oxide until the set molecular weight is reached, so as to obtain a polyether intermediate; and adding a viscosity reducer, continuing to introduce the alkylene oxide until the material introduction is finished, carrying out heat preservation reaction, and carrying out reduced pressure devolatilization to obtain a polyether macromonomer finished product. According to the invention, by adding the viscosity reducer, the preparation of high-molecular-weight polyether by a one-pot process is realized, so that the viscosity in the polyether production process can be reduced, and the outlet pressure of an external circulating pump and the atomization effect of a nozzle in a reactor are reduced; and special reaction equipment is not needed, and the existing PRESS reactor can meet the requirement for producing the high-molecular-weight polyether macromonomer.
本发明提供了一种聚醚大单体、制备方法及其在聚羧酸减水剂中的应用，首先，将起始剂加入反应釜中打底，在氮气保护工况下，加入催化剂，反应，得到活化起始剂；将活化起始剂转入反应装置，加热，开始环氧烷烃通料，反应，持续通入环氧烷烃直至达到设定分子量，得到聚醚中间体；再加入降粘剂，继续通入环氧烷烃直至通料结束，保温反应，减压脱挥，得到聚醚大单体成品。本发明通过添加降粘剂，实现了“一锅法工艺”进行高分子量聚醚的制备，不仅能够降低聚醚生产过程的粘度，降低外循环泵的出口压力和反应器内喷嘴的雾化效果；而且不需要特殊的反应设备，现有PRESS反应器可以满足生产高分子量聚醚大单体的需求。
Polyether macromonomer, preparation method and application of polyether macromonomer in polycarboxylate superplasticizer
The invention provides a polyether macromonomer, a preparation method and application of the polyether macromonomer in a polycarboxylate superplasticizer, firstly, an initiator is added into a reaction kettle for bottoming, under the nitrogen protection working condition, a catalyst is added for reaction, and an activated initiator is obtained; transferring the activated initiator into a reaction device, heating, starting alkylene oxide feeding and reaction, and continuously feeding alkylene oxide until the set molecular weight is reached, so as to obtain a polyether intermediate; and adding a viscosity reducer, continuing to introduce the alkylene oxide until the material introduction is finished, carrying out heat preservation reaction, and carrying out reduced pressure devolatilization to obtain a polyether macromonomer finished product. According to the invention, by adding the viscosity reducer, the preparation of high-molecular-weight polyether by a one-pot process is realized, so that the viscosity in the polyether production process can be reduced, and the outlet pressure of an external circulating pump and the atomization effect of a nozzle in a reactor are reduced; and special reaction equipment is not needed, and the existing PRESS reactor can meet the requirement for producing the high-molecular-weight polyether macromonomer.
本发明提供了一种聚醚大单体、制备方法及其在聚羧酸减水剂中的应用，首先，将起始剂加入反应釜中打底，在氮气保护工况下，加入催化剂，反应，得到活化起始剂；将活化起始剂转入反应装置，加热，开始环氧烷烃通料，反应，持续通入环氧烷烃直至达到设定分子量，得到聚醚中间体；再加入降粘剂，继续通入环氧烷烃直至通料结束，保温反应，减压脱挥，得到聚醚大单体成品。本发明通过添加降粘剂，实现了“一锅法工艺”进行高分子量聚醚的制备，不仅能够降低聚醚生产过程的粘度，降低外循环泵的出口压力和反应器内喷嘴的雾化效果；而且不需要特殊的反应设备，现有PRESS反应器可以满足生产高分子量聚醚大单体的需求。
Polyether macromonomer, preparation method and application of polyether macromonomer in polycarboxylate superplasticizer
一种聚醚大单体、制备方法及其在聚羧酸减水剂中的应用
FAN SHIMIN (Autor:in) / CHEN FENG (Autor:in) / ZENG JUN (Autor:in) / PAN YUJIE (Autor:in) / MENG FANJUN (Autor:in)
25.07.2023
Patent
Elektronische Ressource
Chinesisch
IPC:
C08G
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
,
Makromolekulare Verbindungen, anders erhalten als durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind
/
C04B
Kalk
,
LIME
/
C08F
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
,
Makromolekulare Verbindungen, erhalten durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind
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