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High-molecular-weight macromonomer polyether, polycarboxylate superplasticizer and preparation method thereof

A high molecular weight, macromonomer technology, applied in the fields of organic chemistry and building materials, can solve the problems of low molecular weight, poor viscosity reduction effect, and long reaction time of polycarboxylate superplasticizer monomer polyether. Increase product profitability, reduce residual and side reactions, and improve the effect of reaction conversion

Inactive Publication Date: 2021-03-12
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the low molecular weight of the polycarboxylate water reducer monomer polyether in the prior art, poor viscosity reduction effect, long reaction time, many by-products, and the polycarboxylate produced It is a water reducer monomer polyether with many impurities and high viscosity, which is inconvenient to use, and provides a high molecular weight macromonomer polyether for the preparation of polycarboxylate water reducers.

Method used

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  • High-molecular-weight macromonomer polyether, polycarboxylate superplasticizer and preparation method thereof
  • High-molecular-weight macromonomer polyether, polycarboxylate superplasticizer and preparation method thereof
  • High-molecular-weight macromonomer polyether, polycarboxylate superplasticizer and preparation method thereof

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preparation example Construction

[0042]In a specific embodiment, the present application provides a method for preparing a polycarboxylic acid water reduction agent depleted monomer polyether comprising the steps of: in a reactor with nitrogen and can be a nitrogen bubble device. , The hydroxy ester initiation agent is stirred well, and moisture is detected; then the ethylene oxide, the propanoxide or mixture thereof is added to the appropriate catalyst, so that the weight average molecular weight is 2,400 or more, resulting in high The molecular weight is large. When the moisture is detected, the moisture is less than 0.05% is qualified. If moisture is unqualified, it will cause high impurity content in the product. The impurities are mainly PEG, which will affect the synthesis of the water reducer, which will produce a large amount of foam in the synthesis, and severely affect the water reducer. Demand and other indicators.

[0043] There is currently no related products to be applied to the water repellent mot...

Embodiment 1

[0071] Raw material formulation: 500 hydroxyethyl acrylate, 2.1 potassium hydroxide.

[0072] Preparation method: 500 parts of acrylate hydroxyethyl ester to add a reactor with a ventilator, and the apparatus further comprises emptying and vacuum systems. The stirring was evenly stirred, and the moisture was passed, then stirred, and the mixture was added to the preparation of the potassium hydroxide to prepare the polycarboxylic acid water reduction agent monomer polyether intermediate 1. The prepared polycarboxylic acid-based water reducer monomer polyether intermediate 1 is metered into the high pressure reactor (or the reaction kettle of the ethoxy apparatus) to remove gas blocker components such as oxygen to obtain a high molecular weight. Large monomer polyether intermediate 2.

[0073] 650 part of the propylene oxide is passed, and the reaction temperature is measured by the reaction temperature, preferably from 100 to 145 ° C, no more than 155 ° C. At the same time, the co...

Embodiment 2

[0076] Raw material formula: 500 hydroxylar acid hydroxylate, 2.1 potassium hydroxide.

[0077] Preparation method: 500 servohydroxylar esters were added to the reactor with a venting device, and the apparatus also included emptying and vacuum systems. The stirring was evenly stirred, and the moisture was passed, then stirred, and the mixture was added to the preparation of potassium hydroxide to prepare the polycarboxylic acid-water water reduction agent monomer polyether intermediate. The prepared polycarboxylic acid-based water reducer monomer polyether intermediate 1 is metered into the high pressure reactor (or the reaction kettle of the ethoxy apparatus) to remove gas blocker components such as oxygen to obtain a high molecular weight. Large monomer polyether intermediate 2.

[0078] 650 part of the propylene oxide is passed, and the reaction temperature is measured by the reaction temperature, preferably from 100 to 145 ° C, no more than 155 ° C. At the same time, the contr...

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Abstract

The invention relates to high-molecular-weight macromonomer polyether, which is characterized by being prepared from the following raw material components: (a) hydroxy acrylate; (b) an epoxide; and (c) a catalyst; wherein the epoxide is ethylene oxide, propylene oxide or a mixture of the ethylene oxide and the propylene oxide, and the weight-average molecular weight of the high-molecular-weight macromonomer polyether is 2800-5000. The invention also relates to a preparation method of the high-molecular-weight macromonomer polyether. The invention also relates to a polycarboxylate superplasticizer prepared from the high-molecular-weight macromonomer polyether. The high-molecular-weight macromonomer polyether prepared by the method is low in impurity content, the reaction conversion rate isobviously improved, the yield of a target product is further improved, and the high-molecular-weight macromonomer polyether has the characteristics of environmental protection, safety and benefit win-win. Finally, the high-molecular-weight macromonomer polyether is low in viscosity, and the polycarboxylate superplasticizer prepared from the high-molecular-weight macromonomer polyether has good workability and fluidity.

Description

Technical field [0001] The present application relates to the technical field of organic chemistry and building materials, and more particularly to a high molecular weight large monomer polyether, a polycarboxylic acid water repellent, a polycarboxylic acid water-based polyether, and a high molecular weight polyether polyether. Preparation. Background technique [0002] Wide water reduction is widely used in the construction field, especially for concrete mortar, which can significantly improve the performance of concrete products, reduce the amount of water, shorten the maintenance time. And in recent years, it is widely used in the construction of my country's high-speed railway, and it is also widely used by civil buildings. [0003] The existing water reduction monomer polyether production generally adopts intermittent kettle production. Due to the performance of monomer polyethers during the production process, the product has a high viscosity, low quality, so that a part of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08F283/06C08F220/06C04B24/26C04B103/30
CPCC08G65/2609C08F283/065C04B24/2647C04B2103/302
Inventor 赵鑫杜辉王亚兰季锦卫梁文甜赵梦婷王台
Owner SHANGHAI DONGDA CHEM
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