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Ester-ether mixed structure mud-resistant polycarboxylate superplasticizer and preparation method thereof

A mixed structure, mud-resistant technology, applied in the field of concrete admixtures, can solve the problems of single molecular structure, long synthesis time, poor mud resistance, etc., and achieve the effect of simple process, easy control of reaction conditions, and good slump performance

Inactive Publication Date: 2018-09-04
厦门宏发先科新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of long synthesis time, high energy consumption, single molecular structure and poor mud resistance in the existing preparation technology of mud-resistant polycarboxylate superplasticizer, the present invention provides a kind of polycarboxylate superplasticizer with low dosage and high water reducing rate. , Good anti-mud performance Ester-ether mixed structure anti-mud type polycarboxylate superplasticizer, even if the aggregate has a high mud content, the superplasticizer can still maintain a high water reducing rate

Method used

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  • Ester-ether mixed structure mud-resistant polycarboxylate superplasticizer and preparation method thereof
  • Ester-ether mixed structure mud-resistant polycarboxylate superplasticizer and preparation method thereof
  • Ester-ether mixed structure mud-resistant polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Preparation of mud-resistant polycarboxylate superplasticizer with ester-ether mixed structure

[0028] Raw materials: see Table 1. Among them, the polyether macromonomer is isobutenyl alcohol polyoxyethylene ether (molecular weight 2400); the esterification macromonomer is methoxy polyethylene glycol methyl methacrylate (molecular weight 1200); the unsaturated acid is acrylic acid; the cationic monomer It is methacryloyloxyethyltrimethylammonium chloride; the oxidizing agent is hydrogen peroxide; the chain transfer agent is mercaptoethanol.

[0029] The consumption table (parts by weight) of each composition of table 1 embodiment 1-5

[0030]

Example 1

Example 2

Example 3

Example 4

polyether macromonomer

210

200

180

220

Esterified macromonomer

150

160

180

140

unsaturated acid

33

35

30

40

cationic monomer

2

1

5

1

oxidizing agent

3

4

2

2

...

Embodiment 2

[0037] Example 2: Preparation of mud-resistant polycarboxylate superplasticizer with ester-ether mixed structure

[0038] Raw materials: see Table 1. Among them, the polyether macromonomer is isopentenol polyoxyethylene ether (molecular weight 2400); the esterification macromonomer is methoxy polyethylene glycol methyl acrylate (molecular weight 1200); the unsaturated acid is methacrylic acid; The monomer is acryloyloxyethyltrimethylammonium chloride; the oxidizing agent is ammonium persulfate; the chain transfer agent is thioglycolic acid.

[0039] Preparation method: The dropping time is 3 hours, and the temperature is maintained for 1 hour after the dropping. Other steps are all the same as in Example 1.

Embodiment 3

[0040] Example 3: Preparation of mud-resistant polycarboxylate superplasticizer with ester-ether mixed structure

[0041] Raw materials: see Table 1. The polyether macromonomer is 4-hydroxybutyl vinyl ether (molecular weight 2400); the esterification macromonomer is methoxy polyethylene glycol methyl methacrylate (molecular weight 1200); the unsaturated acid is methacrylic acid ; The cationic monomer is acryloyloxyethyltrimethylammonium chloride; the oxidizing agent is sodium persulfate; the chain transfer agent is 3-mercaptopropionic acid.

[0042] Preparation method: The dropping time is 2.5 hours, and the temperature is maintained for 1 hour after the dropping. Other steps are all the same as in Example 1.

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Abstract

The invention discloses an ester-ether mixed structure mud-resistant polycarboxylate superplasticizer and a preparation method thereof. The superplasticizer is prepared from the following components in parts by weight: 180-220 parts of a polyether macromonomer, 140-180 parts of an esterification macromonomer, 30-40 parts of an unsaturated acid, 1-5 parts of an anionic monomer, 2-4 parts of an oxidant, 0.5-2.5 parts of tartaric acid, 0.5-1.5 parts of a chain transferring agent, 400-500 parts of deionized water and 140-160 parts of 32% sodium hydroxide. The ester-ether mixed structure mud-resistant polycarboxylate superplasticizer has the advantages of being low in admixture amount, high in water reduction rate and good in mud resistance, and even in case of a relatively high mud content ofaggregate, a relatively high water reduction rate can be maintained for the superplasticizer. Meanwhile, the superplasticizer is simple in process, can be prepared under a normal-temperature condition, and is easy in reaction condition control, low in energy consumption and free of pollution.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an ester-ether mixed structure anti-mud polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has the advantages of low dosage, high water reducing rate, good slump retention, and environmental protection. It is widely used in railways, highways, bridges, tunnels, high-rise buildings and other projects. With the rapid growth of concrete usage in recent years, high-quality sand and gravel aggregate resources that meet the requirements of mud content can no longer meet the current needs, so the use of sand and gravel aggregates with high mud content on the market continues to increase. The traditional polycarboxylate superplasticizer is very sensitive to the mud content in the aggregate, because with the increase of the mud content in the aggregate, a part of the polycarboxylate superplasticizer is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/28C08F220/06C08F220/34C08F2/38C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F2/38C08F283/065C08F220/286
Inventor 黄清泉廖惠航郭正辉林成文
Owner 厦门宏发先科新型建材有限公司
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