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Preparation method of high-branching retardation type polycarboxylic acid water reducing agent

A technology of retarded polycarboxylate and high branching, applied in the field of retarded polycarboxylate superplasticizers, can solve the problems of high mud content and failure to meet the requirements, and achieve excellent dispersion effect, simple method, The effect of improving reaction efficiency

Active Publication Date: 2015-09-23
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

These three methods can only solve common problems, but once you encounter building materials with high mud content and poor materials, there are still some defects in trying to solve the problem through the above methods, and it is far from meeting the requirements

Method used

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  • Preparation method of high-branching retardation type polycarboxylic acid water reducing agent
  • Preparation method of high-branching retardation type polycarboxylic acid water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Preparation of high-branched copolymerization products containing azido groups: 10mol hydroxymethyl acrylate, 10mol p-chloromethylstyrene and 0.01mol CuBr / pentamethyldiethylenetriamine (PMDETA) (wherein CuBr and PMDETA The molar ratio is 1:1) through redox reaction to carry out atom transfer radical polymerization (ATRP) reaction for 30min, add 10.1mol sodium azide and stir for 30min, after desalination, obtain molecular weight 3000 and branching degree 10 containing azide Nitrogen-based highly branched copolymerization product;

[0026] 2) Preparation of alkynyl polyethylene glycol monomethyl ether: gradually add 10.1 mol of sodium hydride powder to 10 mol of polyethylene glycol monomethyl ether with a molecular weight of 400 at 10°C, and add a certain amount of 10.1 mol after reacting at room temperature for 30 minutes Propylene bromide, then stirred and reacted for 30min to obtain alkynyl polyethylene glycol monomethyl ether after desalination;

[0027] 3) Prepar...

Embodiment 2

[0029] 1) Preparation of high-branched copolymerization products containing azido groups: 10mol hydroxyethyl acrylate, 1mol p-bromomethylstyrene and 0.11mol CuCl / HMTETA (the molar ratio of CuCl to HMTETA is 1:2) were passed through Oxidation-reduction reaction carries out atom transfer radical polymerization (ATRP) reaction 35min, adds 11mol sodium azide in stirring reaction 40min, after desalting, obtain molecular weight and be 3500 and branch degree be 14 to contain the azide group highly branched copolymerization product;

[0030] 2) Preparation of alkynyl polyethylene glycol monomethyl ether: gradually add 11 mol of sodium hydride powder to 10 mol of polyethylene glycol monomethyl ether with a molecular weight of 500 at 20°C, and add a certain amount of 11 mol of propyne after reacting at room temperature for 30 minutes Bromine, then stirred and reacted for 40min to obtain alkynyl polyethylene glycol monomethyl ether after desalination

[0031] 3) Preparation of high-branc...

Embodiment 3

[0033] 1) Preparation of high-branched copolymerization products containing azido groups: 10mol hydroxy-n-butyl acrylate, 8mol chloromethylated polystyrene resin (CMPS) and 0.2mol CuBr / tetrakis[(2-pyridyl)methyl Base] Ethylenediamine (TPEN) (the molar ratio of CuBr to TPEN is 1:2) undergoes atom transfer radical polymerization (ATRP) reaction by redox reaction for 40min, adds 11mol sodium azide and stirs for 120min, after desalination The obtained molecular weight is 5000 and the degree of branching is 20 containing the azide group hyperbranched copolymerization product;

[0034]2) Preparation of alkynyl polyethylene glycol monomethyl ether: gradually add 10.5 mol of sodium hydride powder to 10 mol of polyethylene glycol monomethyl ether with a molecular weight of 800 at 35°C, and add a certain amount of 11 mol of propyne after reacting at room temperature for 30 minutes bromine, then stirred and reacted for 50min to obtain alkynyl polyethylene glycol monomethyl ether after de...

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Abstract

The invention discloses a preparation method of a high-branching retardation type polycarboxylic acid water reducing agent. The preparation method comprises the following steps: firstly, preparing a high-branching copolymerization product containing an azide group; secondly, preparing alkynyl methoxy polyethylene glycol; thirdly, performing a click chemical reaction between the high-branching copolymerization product containing the azide group and alkynyl methoxy polyethylene glycol to obtain the high-branching retardation type polycarboxylic acid water reducing agent. The molecular weight of the high-branching copolymerization product containing the azide group is controlled, the product performance is adjusted by the degree of branching and the molecular weight of methoxy polyethylene glycol, the reaction is quick, the efficiency is high, the water reducing agent is nontoxic and pollution-free, and the operation is simple and convenient. The polycarboxylic acid water reducing agent prepared according to the preparation method is a functional polycarboxylic acid high-efficiency water reducing agent, and has the advantages of being strong in concrete adaptability, high in water reducing rate, long in slump retaining time, and stable in product performance.

Description

technical field [0001] The invention relates to the technical field of a retarded polycarboxylate water reducer for cement concrete, in particular to a method for preparing a highly branched retarded polycarboxylate water reducer by using ATRP and click chemical reaction. Background technique [0002] With the rapid development of high-performance concrete, higher and higher requirements are put forward for concrete performance and raw materials, especially for "small slump" concrete, which puts extremely high requirements on polycarboxylate superplasticizer. After recent years of development and technological updates, domestic polycarboxylate water reducers have made great progress, but still rely on the method of overdosing water reducers to compensate for the loss of concrete slump over time. Once the concrete mix ratio has been fixed and the initial slump of the concrete is required to be within a certain range, the dosage of the polycarboxylate superplasticizer has to b...

Claims

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Application Information

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IPC IPC(8): C08G83/00C08F220/28C08F212/14C08G65/48C04B24/24
Inventor 钱珊珊石宇丁蓓王毅姜海东郑春扬
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD