ATRP ester-based amide block polymer modified polycarboxylic acid water reducer and preparation method thereof

A technology of methacrylate-based amide block and block polymer, which is applied in the field of polycarboxylate water reducing agent and its preparation, can solve the problems of lack of bulk polymerization characteristics and the like, and achieves good slump retention, good descriptiveness, The effect of high water reduction rate

Inactive Publication Date: 2020-03-17
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a part of the aqueous solution as a solvent, which does not have the characteristics of bulk polymerization, and the polymerization product needs to be dried

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] A method for preparing a polycarboxylate water reducer modified by an ATRP ester-based amide block polymer. The total mass of raw materials is 1000 parts, and the mass fraction is about 40%. The preparation process parameters are as follows:

[0037] Vinyl butyl ether polyoxyethylene ether: 374 parts;

[0038] Benzyl methacrylate: 7 parts;

[0039] 4-(acrylamide) benzoic acid: 15 parts;

[0040] N,N,N',N',N"-pentamethyldivinyltriamine: 0.8 parts;

[0041] 2-Bromo-3-methylbutenoic acid methyl ester: 1.3 parts;

[0042] Ferrous bromide: 0.04 parts;

[0043] Phenylphenol polyoxyethylene ether: 2.8 parts;

[0044] The rest is water.

[0045] Step 1: Preparation of ester-based amide modified block: 7 parts of benzyl methacrylate, 15 parts of 4-(acrylamide) benzoic acid, 0.8 parts of N,N,N',N',N"-pentamethyl Divinyltriamine, 0.04 parts of ferrous bromide, phenethylphenol polyoxyethylene ether emulsifier and 300 parts of deionized water were mixed and added into a three-...

example 2

[0048] A method for preparing a polycarboxylate water reducer modified by an ATRP ester-based amide block polymer. The total mass of raw materials is 1000 parts, and the mass fraction is about 40%. The preparation process parameters are as follows:

[0049] Vinyl butyl ether polyoxyethylene ether: 378 parts;

[0050] Benzyl methacrylate: 8 parts;

[0051] Sulfonamide: 13 parts;

[0052] N,N,N',N',N"-pentamethyldivinyltriamine: 0.7 parts;

[0053] Composition of 1-chloro-3-methyl-2-butene and allyl bromide with a mass ratio of 1: 1.5 parts;

[0054] Ferrous bromide: 0.06 parts;

[0055] Composition of sodium 2-acrylamide-2,2-dimethylethanesulfonate and vinyl polyethylene glycol with a mass ratio of 2:1: 3.6 parts;

[0056] The rest is water.

[0057] Step 1: Preparation of ester-based amide modified block: 8 parts of benzyl methacrylate, 13 parts of sulfonamide, 0.7 parts of N,N,N',N',N"-pentamethyldivinyltriamine , 0.06 parts of ferrous bromide, 3.6 parts of 2-acrylamide...

example 3

[0060] A method for preparing a polycarboxylate water reducer modified by an ATRP ester-based amide block polymer. The total mass of raw materials is 1000 parts, and the mass fraction is about 40%. The preparation process parameters are as follows:

[0061] Vinyl butyl ether polyoxyethylene ether: 380 parts;

[0062] Composition of ethylene glycol dimethacrylate and 1,4-butanediol dimethacrylate with a mass ratio of 1:1: 6 parts;

[0063] 4-vinylbenzamide: 9 parts;

[0064] N,N,N',N',N",N"-hexamethacrylate triethylenetetramine: 1.1 parts;

[0065] Methallyl chloride: 1.4 parts;

[0066] Composition of ferrous bromide and cuprous bromide with a mass ratio of 2:1: 0.05 parts;

[0067] Sodium 2-acrylamide-2,2-dimethylethanesulfonate: 3.1 parts;

[0068] The rest is water.

[0069] Step 1: Preparation of ester-based amide modified block: 6 parts of a composition of ethylene glycol dimethacrylate and 1,4-butanediol dimethacrylate in a mass ratio of 1:1, 9 parts of 4 -Ethylene...

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Abstract

The invention discloses an ATRP ester-based amide block polymer modified polycarboxylic acid water reducer and a preparation method thereof. The water reducer is mainly prepared by the following polymerization steps: a first polymerization step: under certain conditions, mixing unsaturated ester monomers, amide monomers, ligands, a catalyst, an emulsifier and water, adding the mixture into a three-neck flask with a mechanical stirring device, controlling the temperature to be 60-80 DEG C, continuously stirring, and dropwise adding an initiator to prepare an ester-based amide modified block polymer I; and a second synthesis step: controlling the temperature at 65-80 DEG C, adding a mixed solution of a polyether macromonomer and water to the ester-based amide modified block polymer I, carrying out a reaction, carrying out heat preservation, adding an alkali liquid to adjust the pH value of the system to about 10, and cooling to obtain the polycarboxylic acid water reducer. The polycarboxylic acid water reducer prepared by the invention adopts ATRP active polymerization, the rate is controllable, the compatibility with cement is better, the shrinkage rate of acted concrete is small, the slump is well maintained, and the performance is superior to that of traditional free radical polymerization.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures for building materials, and in particular relates to a polycarboxylate water reducer modified by an ATRP method ester-based amide block polymer and a preparation method thereof. Background technique [0002] Concrete admixture is a material added before or during concrete mixing to improve the performance of freshly mixed and hardened concrete. It is characterized by less dosage and great effect, so some people compare it to the seasoning in food, and some people say it can play the role of "four or two thousand catties". The application of various concrete admixtures improves many properties of freshly mixed and hardened concrete and promotes concrete. The development of new technology wood has promoted the application of industrial by-products in cementitious material systems, and also helps to save resources and protect the environment. It has gradually become an indispensable fifth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F299/02C04B24/20C04B24/26C04B103/30
CPCC08F299/022C04B24/2658C04B24/20C04B24/2694C04B2103/302
Inventor 陈艳林徐洪飞柯凯
Owner HUBEI UNIV OF TECH
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