Polyether amine water reducing agent with controllable and regular molecular structure and preparation method of polyether amine water reducing agent

A technology of polyether amines and molecular structure, which is applied in the field of preparing polywater reducers by combining amine-epoxy ring-opening polymerization and esterification, which can solve the problem of large steric hindrance of unsaturated macromonomers Problems such as the inability of the initiator to initiate and the failure of the macromolecular initiator to achieve rapid and high-efficiency response, good cost performance and competitive advantage, and reduce the difficulty of the reaction

Active Publication Date: 2017-09-26
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of uncontrollable molecular weight, wide molecular weight distribution, and undesignable molecular structure of polycarboxylic acid, but the method has disadvantages such as low efficiency, complicated process, and low product yield. The first step of the two-step reaction produces When the macromolecular ATRP initiator regulates the second-step reaction, there will be a defect that some macromolecular initiators fail, which will cause some macromolecular initiators to fail to initiate
Secondly, when the ATRP initiator initiates the step of unsaturated macromonomer, the steric hindrance of unsaturated macromonomer is large, and the polymerization efficiency is low.
It is difficult to achieve the performance of conventional comb-type polycarboxylate superplasticizers and there is little room for development

Method used

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  • Polyether amine water reducing agent with controllable and regular molecular structure and preparation method of polyether amine water reducing agent
  • Polyether amine water reducing agent with controllable and regular molecular structure and preparation method of polyether amine water reducing agent
  • Polyether amine water reducing agent with controllable and regular molecular structure and preparation method of polyether amine water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 10mol amino-terminated polyether (R 1is methyl, m and n are both zero, p=10, and the weight average molecular weight is 500), 11mol 1,3-butadiene diepoxide is stirred at normal temperature and pressure for 5h to carry out amino-epoxy ring-opening polymerization reaction to realize the grafting of amino-terminated polyether on the main chain into a side chain polymer. After the reaction is completed, after dehydration and drying, add dehydrated dimethyl sulfoxide, then add 22mol malonic anhydride and 0.1mol dimethyl The aminopyridine was subjected to an esterification reaction for 0.5 h to obtain a polyether amine water reducer with a weight average molecular weight of 20,000.

Embodiment 2

[0046] 10mol amino-terminated polyether (R 1 is methyl, m and n are both zero, p=17, and the weight average molecular weight is 800), 10.1mol1,5-hexadiene diepoxide is stirred at normal temperature and pressure for 1h to carry out amino-epoxy ring-opening polymerization Reaction, to realize the grafting of amino-terminated polyether on the main chain into a side chain polymer, after the reaction is completed, after dehydration and drying, add dehydrated tetrahydrofuran, then add 20.1mol malonic anhydride and 0.2mol p-toluenesulfonic acid for esterification The reaction was carried out for 1 hour to obtain a polyetheramine water reducer with a weight average molecular weight of 40,000.

Embodiment 3

[0048] 10mol amino-terminated polyether (R 1 is methyl, m is zero, n=7, p=10, weight average molecular weight is 1000), 10.2mol bis(2,3-epoxycyclopentyl)ether is stirred at normal temperature and pressure for 5h to carry out amino- Epoxy ring-opening polymerization reaction, to realize the grafting of amino-terminated polyether on the main chain to form a side chain polymer. After the reaction is completed, after dehydration and drying, add dehydrated N,N dimethylformamide, and then add 21.1mol Succinic anhydride and 0.3 mol of strongly acidic cation exchange resin were esterified for 1 hour to obtain a polyether amine water reducer with a weight average molecular weight of 50,000.

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Abstract

The invention discloses a polyether amine water reducing agent with a controllable and regular molecular structure. A preparation method of the polyether amine water reducing agent comprises the following steps: adopting an end-amino polyether and diepoxide to have amino-epoxy ring-opening polymerization reaction, obtaining a polymer with the end-amino polyether being grafted on a main chain into a side chain, and then enabling hydroxyl generated in the amino-epoxy ring-opening polymerization reaction to have esterification reaction with organic anhydride to obtain the polyether amine water reducing agent with the controllable and regular molecular structure. The water reducing agent prepared by the invention has the advantages of the existing water reducing agent, is also good in controllability of the production process, less in side reaction, high in applicability to different cement varieties, high in water reducing rate and high in cost performance and competitive advantage.

Description

technical field [0001] The invention relates to the technical field of a water reducer for cement concrete, in particular to a method for preparing a poly water reducer by combining an amine-epoxy ring-opening polymerization reaction and an esterification reaction. Background technique [0002] At present, the high-efficiency water reducers commonly used in the market can be divided into naphthalene-based, melamine-based, and sulfamate-based. Traditional high-efficiency water reducers such as naphthalene, melamine, and sulfamate have large slump changes, complex production processes, high energy consumption, and large environmental pollution. They cannot meet the requirements of the low-carbon economy era, and cannot meet the requirements of concrete construction. and sustainable development needs. With the increasingly higher requirements for the durability and strength of concrete buildings in engineering construction and application, it is required to develop low-volume,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C08G59/22C08G59/24C08G59/14C04B24/28C04B103/30
CPCC04B24/281C04B2103/302C08G59/1438C08G59/22C08G59/24C08G59/5013
Inventor 钱珊珊姜海东王高明胡阳成郑春扬郭兆来
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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