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Cross-linked polycarboxylic acid water reducing agent and preparation method thereof

A polycarboxylic acid, cross-linked technology, applied in the field of concrete admixtures, can solve the problems of limited number of PEG long side chains, unsatisfactory cement particle dispersion effect, etc., and achieves easy reaction control, good workability, and reaction equipment. simple effect

Active Publication Date: 2012-08-22
ZHUZHOU KAMILE SU BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited number of long side chains of PEG and irreversible cross-linked polymers, the water reducer molecules are not very effective in dispersing cement particles.

Method used

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  • Cross-linked polycarboxylic acid water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In the reaction kettle with good airtightness, under continuous stirring, 1500 kg of methallyl alcohol polyoxyethylene ether with a molecular weight of 2400, 150 kg of polyethylene glycol dimethacrylate with a molecular weight of 400, methacrylic sulfonic acid Sodium 20kg, deionized water 775kg, heat up to 45-50°C, stir for 10min, continue to heat up to 60-62°C, add hydrogen peroxide 5.2kg, then slowly add acrylic acid solution (148kg acrylic acid + 56kg water) and solution (2kg thioglycolic acid + 2.4kg sodium ascorbate + 500kg water), drop it within 3 to 3.5 hours, keep it warm for 1 to 1.5 hours, cool down to 50°C after the reaction, replenish 1000 kg of water, add liquid alkali to neutralize to pH = 6.5 to 7, and obtain poly Carboxylic acid mother liquor.

Embodiment 2

[0029] In the reaction kettle with good airtightness, under continuous stirring, 1500 kg of methallyl alcohol polyoxyethylene ether with a molecular weight of 2400, 200 kg of polyethylene glycol dimethacrylate with a molecular weight of 400, sodium methacrylic sulfonate 20kg, 775kg deionized water, heat up to 45-50°C, stir for 10min, continue to heat up to 60-62°C, add 5.2kg of hydrogen peroxide, then slowly add acrylic acid solution (148kg acrylic acid + 56kg water) and solution (2kg thioglycolic acid + 2.4kg sodium ascorbate + 500kg water), drop it within 3-3.5 hours, keep warm for 1-1.5 hours, cool down to 50°C after the reaction, replenish 1100 kg of water, add liquid alkali to neutralize to pH=6.5-7, and obtain polycarboxylate acid mother liquor.

Embodiment 3

[0031] In the reaction kettle with good airtightness, under continuous stirring, 1500 kg of methallyl alcohol polyoxyethylene ether with a molecular weight of 2400, 150 kg of polyethylene glycol dimethacrylate with a molecular weight of 400, methacrylic sulfonic acid Sodium 20kg, deionized water 775kg, heat up to 45-50°C, stir for 10min, continue to heat up to 60-62°C, add hydrogen peroxide 5.2kg, then slowly add acrylic acid solution (160kg acrylic acid + 56kg water) and solution (2kg thioglycolic acid + 2.4kg sodium ascorbate + 500kg water), drop it within 3-3.5 hours, keep it warm for 1-1.5 hours, cool down to 50°C after the reaction, add water 1050kg, add liquid alkali to neutralize to pH=6.5-7, and obtain polycarboxylate acid mother liquor.

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Abstract

The invention relates to a preparation method of a cross-linked polycarboxylic acid water reducing agent. The molecular weight of the cross-linked polycarboxylic acid water reducing agent is 10000-100000. The preparation method comprises the following steps: sequentially adding methylallylalcohol polyethenoxy ether, polyethyleneglycol dimethyl acrylate, sodium methylacrylsulfonate and deionized water into a reaction kettle with good leak tightness while continuously stirring, heating to 45-50 DEG C, stirring for 10 minutes, continuing heating to 60-62 DEG C, adding oxydol, slowly and dropwisely adding an acrylic acid solution and a chain-transfer agent within 3-3.5 hours, keeping the temperature for 1-1.5 hours, cooling to 50 DEG C after the reaction finishes, supplementing water, and adding liquid alkali to neutralize until the pH value reaches 6.5-7, thereby obtaining the cross-linked polycarboxylic acid water reducing agent of which the solid content is 40%. The invention has the advantages of simple reaction equipment, easily controlled reaction, low cost and the like; and the prepared cross-linked polycarboxylic acid water reducing agent has the advantages of high water reducing rate, favorable workability and high slumping retention.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a cross-linked polycarboxylate water reducer and a preparation method thereof. Background technique [0002] In recent years, with the start of infrastructure projects such as domestic high-speed railways, urban subways, civil aviation airports, and hydropower projects, the polycarboxylate water reducer industry has also grown rapidly. As the requirements for concrete in engineering are becoming more and more stringent, the demand for high-performance concrete is also increasing, and there is an urgent need for new ether polycarboxylate superplasticizer products with better performance and lower cost in China. [0003] At present, there are mainly three types of polycarboxylate water reducers in China: 1. Ester polycarboxylate water reducers, that is, methoxypolyethylene glycol mono(meth)acrylate is used as a polyoxyethylene-based large unit. 2. Ordinary ether polycarboxylate water reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F283/06C04B103/30
Inventor 廖声金
Owner ZHUZHOU KAMILE SU BUILDING MATERIALS
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