Phenyl modified polycarboxylic acid slump retaining agent and preparation method thereof

A technology of polycarboxylic acid and slump-retaining agent, applied in the field of phenyl-modified polycarboxylic acid slump-retaining agent and its preparation, can solve the problems of normal setting, concrete segregation and bleeding, slow strength development, etc. Good properties, good adsorption and dispersion ability, and strong fluidity retention ability

Inactive Publication Date: 2020-05-08
ZHEJIANG COLLEGE OF CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of water reducing agents sold on the market are mainly mixed with a certain proportion of slump-retaining agent and retarder to solve the slump-retaining ability of concrete over time. This method cannot solve the problem fundamentally, and also brings some disadvantages. , such as: concrete segregation and bleeding in a short period of time, failure to condense normally, slow strength development, and real-time control according to the transportation distance, etc.

Method used

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  • Phenyl modified polycarboxylic acid slump retaining agent and preparation method thereof
  • Phenyl modified polycarboxylic acid slump retaining agent and preparation method thereof

Examples

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example 1

[0020] Phenyl-modified polycarboxylic acid slump-retaining agent and its preparation method, the total mass of raw materials is 1000 parts, the mass fraction is 40%, and it is mainly prepared from the following components:

[0021] Vinyl butyl ether polyoxyethylene ether: 352 parts; (4-methyl basic) aimine: 8 parts; acrylic acid: 8 parts; hydroxyethyl acrylate: 27 parts; lauryl peroxide: 0.86 parts; Azodiisoheptanonitrile: 1.63 parts; mercaptoethanol: 1.52 parts; the rest is water, with a total mass of 1000 parts and a solid content of 40%.

[0022] Step (1): Preparation of benzene ring block polymers: Add 8 parts of (4-methyl-based) formimine, 12 parts of hydroxyethyl acrylate and 50 parts of deionized water into the reaction kettle ①, at 40°C Next, evenly drop the initiator, that is, a mixed solution of 0.86 parts of lauryl peroxide and 50 parts of deionized water, and the dropping time is 1 h to obtain a benzene ring block polymer;

[0023] Step (2): Preparation of polycar...

example 2

[0025] Phenyl-modified polycarboxylic acid slump-retaining agent and its preparation method, the total mass of raw materials is 1000 parts, the mass fraction is 40%, and it is mainly prepared from the following components: vinyl butyl ether polyoxyethylene ether: 355 parts; Styrene: 7 parts; Acrylic acid: 12 parts; Hydroxypropyl acrylate: 21 parts; Dibenzoyl peroxide: 1.12 parts; The rest is water, the total mass is 1000 parts, and the solid content is 40%.

[0026] Step (1): Preparation of benzene ring block polymer: Add 7 parts of styrene, 8 parts of hydroxypropyl acrylate and 50 parts of deionized water into the reaction kettle ①, and evenly add the initiator dropwise at 50°C. That is, a mixed solution of 1.12 parts of dibenzoyl peroxide and 50 parts of deionized water was added dropwise for 0.5 hours to obtain a benzene ring block polymer;

[0027] Step (2): Preparation of polycarboxylate slump-retaining agent: Add 355 parts of vinyl butyl ether polyoxyethylene ether and ...

example 3

[0029] Phenyl-modified polycarboxylic acid slump-retaining agent and its preparation method, the total mass of raw materials is 1000 parts, the mass fraction is 40%, and it is mainly prepared from the following components: vinyl butyl ether polyoxyethylene ether: 357 parts; 2-aminostyrene: 6 parts; acrylic acid: 10 parts; hydroxyethyl acrylate: 23 parts; ammonium persulfate: 0.94 parts; dimethyl azobisisobutyrate: 1.57 parts; Water, the total mass is 1000 parts, and the solid content is 40%.

[0030] Step (1): Preparation of benzene ring block polymer: add 6 parts of 2-aminostyrene, 13 parts of hydroxyethyl acrylate and 50 parts of deionized water into the reaction kettle ①, and drop evenly at 45°C Initiator, i.e. a mixed solution of 0.94 parts of ammonium persulfate and 50 parts of deionized water, the dropping time is 0.5h, and the benzene ring block polymer is obtained;

[0031] Step (2): Preparation of polycarboxylate slump-retaining agent: Add 357 parts of vinyl butyl ethe...

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Abstract

The invention relates to a phenyl modified polycarboxylic acid slump retaining agent and a preparation method thereof. The slump retaining agent is mainly prepared from 352-364 parts of a polyether macromonomer, 5-8 parts of a benzene ring monomer, 8-12 parts of acrylic acid, 18-28 parts of alkyl acrylate, 0.68-1.12 parts of an initiator a, 1.48-1.82 parts of an initiator b, 1.32-1.63 parts of a chain transfer agent, and the balance of water, the number of total parts by mass of the slump retaining agent is 1000, and the solid content is 40%. The polycarboxylic acid slump retaining agent prepared through the method is good in adsorption and dispersion capacity and good in fluidity retentivity.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a phenyl-modified polycarboxylic acid slump-retaining agent and a preparation method thereof. Background technique [0002] As a green and environmentally friendly concrete admixture, polycarboxylate superplasticizer has a good dispersion effect. In recent years, in response to the national environmental protection slogan, to create a new type of green economical country, a large number of major commercial concrete mixing plants in urban areas and suburbs have been shut down. Concrete for urban construction needs to be supplied by distant mixing plants. A serious test has come. The long-distance transport of concrete requires the concrete to have a slump retention capacity of more than two hours. In addition to the construction waiting time, the concrete pumping capacity of four to five hours has become the quantitative standard of the mixing station. However, a large number of water redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C08G81/02C04B24/26
CPCC08F283/065C08G81/021C04B24/2694
Inventor 陈树东俞建锋柯凯张言飞何月来石时荣
Owner ZHEJIANG COLLEGE OF CONSTR
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