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Preparation methods of alkaline polyether monomer and polycarboxylate water reducer

A technology of polycarboxylic acid and water reducer, which is applied in the field of concrete admixtures, and can solve problems such as increasing difficulty and reducing production efficiency

Pending Publication Date: 2020-09-08
联泓(江苏)新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These limitations undoubtedly increase the difficulty of applying this method to a large-scale production process and significantly reduce the production efficiency

Method used

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  • Preparation methods of alkaline polyether monomer and polycarboxylate water reducer
  • Preparation methods of alkaline polyether monomer and polycarboxylate water reducer
  • Preparation methods of alkaline polyether monomer and polycarboxylate water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Put vinyl glycol ether into a stainless steel high-pressure reaction kettle, the input amount is 564.46g, add 3.63g of potassium hydroxide solid, replace with nitrogen, then turn on the heating under stirring, and start to slowly pass into the reactor after the temperature rises to 110°C Add 2638.55g of ethylene oxide to carry out polymerization reaction, maintain the temperature at 110°C, and keep the pressure relatively constant at about 0.3MPa until all the ethylene oxide is added into the reactor and keep it warm for about 1 hour until the pressure of the reactor no longer drops. After vacuuming and degassing, the temperature was lowered to 80° C., and the material was discharged to obtain intermediate 1 with a molecular weight of 482.

Embodiment 2

[0070]Put diethylene glycol monovinyl ether into a stainless steel high-pressure reaction kettle, the input amount is 217.84g, add 1.15g of potassium hydroxide solid, replace with nitrogen, then turn on the heating under stirring, and start slowly to the reactor after the temperature rises to 110°C Introduce 935.97g of ethylene oxide into the reactor for polymerization, maintain the temperature at 110°C, and keep the pressure relatively constant at about 0.3MPa, until all the ethylene oxide is added into the reactor, and keep it warm for about 1 hour, until the pressure of the reactor no longer drops Time. After vacuuming and degassing, the temperature was lowered to 80° C., and the material was discharged to obtain intermediate 2 with a molecular weight of 675.

Embodiment 3

[0072] Put vinyl glycol ether into a stainless steel high-pressure reaction kettle with an input amount of 367.21g, add 3.81g of potassium hydroxide solid, replace with nitrogen, then turn on the heating under stirring, and start to slowly pass into the reactor after the temperature rises to 110°C Add 2974.06g of ethylene oxide to carry out polymerization reaction, maintain the temperature at 110°C, and keep the pressure relatively constant at about 0.3MPa until all the ethylene oxide is added into the reactor and keep it warm for about 1 hour until the pressure of the reactor no longer drops. After vacuuming and degassing, the temperature was lowered to 80° C., and the material was discharged to obtain intermediate 3 with a molecular weight of 768.

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Abstract

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.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a preparation method of an alkaline polyether monomer and a polycarboxylate water reducer. Background technique [0002] As an important combination part of modern concrete, polycarboxylate superplasticizer has been widely used in the field of concrete engineering technology due to its excellent advantages such as low dosage, high slump retention, and large degree of freedom in molecular design. Currently widely used polycarboxylic acid water-reducing monomers include methallyl polyoxyethylene ether (HPEG) and prenol polyoxyethylene ether (TPEG). According to reports, the polycarboxylate mother liquor synthesized by using HPEG monomer has high water reduction but poor slump retention performance, and the concrete is easy to bleed and segregate. Poor adaptability. Due to the continuous increase in environmental protection supervision and strict control over the minin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F2/38C04B24/26C04B103/30
CPCC08F283/065C08F2/38C04B24/2694C04B2103/302
Inventor 李华威赵余徉郭晓峰牛峰陈阳张俊李磊李方
Owner 联泓(江苏)新材料研究院有限公司
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