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Preparation method of benzene ring-containing sulfonic block modified polycarboxylic acid slump retaining agent

A benzene ring sulfonic acid-based block and slump-retaining agent technology, which is applied in the field of building materials, can solve the problem of low sensitivity and achieve the effects of good adsorption and dispersibility, easy bending, and strong dispersibility

Inactive Publication Date: 2020-04-24
ZHEJIANG COLLEGE OF CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The double ester group is hydrolyzed under the alkaline condition of the cement paste, releasing more carboxyl groups, which can improve the slump performance of concrete. At the same time, the polycarboxylate slump retention agent of this structure can be used in various materials and is less sensitive. Low

Method used

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  • Preparation method of benzene ring-containing sulfonic block modified polycarboxylic acid slump retaining agent
  • Preparation method of benzene ring-containing sulfonic block modified polycarboxylic acid slump retaining agent
  • Preparation method of benzene ring-containing sulfonic block modified polycarboxylic acid slump retaining agent

Examples

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example 1

[0024] The preparation method of the block-modified polycarboxylic acid slump-retaining agent containing benzene ring sulfonic acid groups, the total mass of raw materials is 1000 parts, the mass fraction is 40%, and it is mainly prepared from the following components: styrene: 4 parts; styrene Sodium sulfonate: 12 parts; lauryl peroxide: 0.58 parts; acrylic acid: 11 parts; hydroxyethyl acrylate: 27 parts; vinyl butyl ether polyoxyethylene ether and prenyl alcohol in a mass ratio of 1:2 Composition of polyoxyethylene ether: 342 parts; azobisisoheptanonitrile: 1.43 parts; azobisisobutyrocyanoformyl: 0.73 parts; mercaptoethanol: 1.26 parts; the rest is water.

[0025] Step (1): Preparation of benzene ring sulfonic acid block: add 4 parts of styrene, 12 parts of sodium styrene sulfonate and 50 parts of deionized water into No. Initiator a, the dropping time is 2 hours, react to prepare benzene ring sulfonic acid block polymer i; initiator a is a mixed solution of 0.54-0.76 parts ...

example 2

[0029]The preparation method of the block-modified polycarboxylic acid slump-retaining agent containing benzene ring sulfonic acid groups, the total mass of raw materials is 1000 parts, the mass fraction is 40%, and it is mainly prepared from the following components: 1 with a mass ratio of 1:2 - the composition of allyl-2-fluorobenzene and 1-allyl-4-fluorobenzene: 8 parts; the composition of sodium methacrylsulfonate and sodium vinylsulfonate in a mass ratio of 1:1: 6 parts; dibenzoyl peroxide: 0.56 parts; acrylic acid: 13 parts; hydroxypropyl acrylate: 22 parts; vinyl butyl ether polyoxyethylene ether: 346 parts; 1.34 parts; tert-butyl peroxybenzoate: 1.44 parts; mercaptoethanol: 1.66 parts; the rest is water.

[0030] Step (1): Preparation of benzene ring sulfonic acid group block: add 8 parts of 1-allyl-2-fluorobenzene and 1-allyl-4-fluorobenzene with a mass ratio of 1:2 to No. 1 reactor After the composition of benzene, the composition of 6 parts of sodium methacrylate a...

example 3

[0034] The preparation method of the block-modified polycarboxylic acid slump-retaining agent containing benzene ring sulfonic acid groups, the total mass of raw materials is 1000 parts, the mass fraction is 40%, and it is mainly prepared from the following components: 4-methoxy-2- Vinylaniline: 6 parts; a composition of sodium methacrylsulfonate and 2-acrylamide-2-methylpropanesulfonic acid in a mass ratio of 1:1: 14 parts; lauryl peroxide: 0.71 parts; acrylic acid : 10 parts; hydroxyethyl acrylate: 23 parts; the composition of vinyl butyl ether polyoxyethylene ether and isopentenol polyoxyethylene ether with a mass ratio of 1:2: 342 parts; azobisisoheptanonitrile : 1.66 parts; azobisisobutyronitrile: 1.07 parts; mercaptopropanol: 1.56 parts; the rest is water.

[0035] Step (1): Preparation of benzene ring sulfonic acid group block: Add 6 parts of 4-methoxy-2-vinylaniline and 14 parts of sodium methylpropenesulfonate with a mass ratio of 1:1 to No. 1 reactor After stirring ...

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Abstract

The invention relates to a preparation method of a benzene ring-containing sulfonic block modified polycarboxylic acid slump retaining agent. The polycarboxylic acid slump retaining agent is preparedby adopting a block polymerization method. The preparation method comprises the following steps: copolymerizing a benzene ring-containing monomer and a sulfonic acid monomer under certain conditions to obtain a benzene ring sulfonic block polymer i; the preparation method comprises the following steps: copolymerizing a polyether macromonomer and acrylic acid at normal temperature to obtain a blockpolymer ii, adjusting the ratio of the block polymer i to the block polymer ii, and opening double bonds to prepare the polycarboxylic acid slump retaining agent with the block copolymer by taking hydroxyethyl acrylate as a linking monomer. The polycarboxylic acid slump retaining agent prepared by the invention is prepared by adopting a block method for modification, strong anion groups such as steric hindrance and sulfo groups in a short side chain region are increased by benzene rings to provide anchoring groups, and unsaturated alkyl ester and acrylic acid are connected with a block polymer, so that the water reducing agent has relatively strong slump retaining performance and lasting slurry fluidity.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a preparation method of a block-modified polycarboxylic acid slump-retaining agent containing a benzene ring sulfonic acid group. Background technique [0002] Polycarboxylate superplasticizer is one of the five indispensable components of high-performance concrete. Polycarboxylate superplasticizers form high-molecular copolymers due to the copolymerization of polyether macromonomers and small molecular monomers with terminal double bond structures. , known as the third generation concrete superplasticizer. The polycarboxylate slump-retaining agent containing polyether side chains should have the advantages of green environmental protection, high slump-prevention, large degree of freedom in cement adaptability to wide molecular structure, and significant effect on concrete reinforcement. It has been successfully applied in roads, bridges, dams, tunnels, high-rise build...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F287/00C08F220/20C04B24/16C04B24/22
CPCC08F287/00C04B24/22C04B24/165C04B2103/302C04B2103/308C08F220/20
Inventor 陈树东张言飞柯凯俞建锋郑浩宇余泠毅
Owner ZHEJIANG COLLEGE OF CONSTR
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