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Preparation method of ester early-strength polycarboxylic acid water reducing agent

An early-strength, polycarboxylic acid technology, applied in the field of building materials, can solve problems such as reducing 28d strength, achieve superior early-strength performance, promote hydration, and accelerate the formation of results.

Active Publication Date: 2013-12-18
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there are many problems in the application of composite early-strength superplasticizers. Some early-strength agents contain chlorine salts, and chlorine-containing admixtures are prohibited from being used in reinforced concrete and prestressed concrete structural engineering, and although the composite type Early strength water reducer can increase the early strength of concrete, but also reduce its 28d strength

Method used

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  • Preparation method of ester early-strength polycarboxylic acid water reducing agent

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Embodiment 1

[0021] (1) Amidation reaction: In parts by mass, 86.09 parts of methyl acrylate, 105.14 parts of diglycolamine and 0.96 parts of sodium hydroxide were placed in reactor A, and kept at 70°C for 3 hours to obtain amide small Alcoholamine monomer NP. The molar ratio of methyl acrylate and diglycolamine is 1:1, and the amount of sodium hydroxide is 0.5% of the total mass of methyl acrylate and diglycolamine.

[0022] (2) Esterification reaction: in parts by mass, 100.00 parts of polyethylene glycol monomethyl ether with a molecular weight of 1000, 51.65 parts of methacrylic acid, 2.27 parts of concentrated sulfuric acid and 0.76 parts of hydroquinone were placed in reaction kettle B , at 130° C. for 3 hours to obtain the esterified macromonomer MP. The molar ratio of polyethylene glycol monomethyl ether and methacrylic acid is 1:6, and the consumption of concentrated sulfuric acid and hydroquinone are 1.5% and 0.5% of the total mass of polyethylene glycol monomethyl ether and met...

Embodiment 2

[0025] (1) Amidation reaction: In parts by mass, 128.17 parts of butyl acrylate, 49.67 parts of triethanolamine and 1.78 parts of sodium hydroxide were placed in reaction kettle A, and kept at 80°C for 4 hours to obtain amide small alcohol amine mono Body NP. The molar ratio of butyl acrylate and triethanolamine is 3:1, and the amount of sodium hydroxide is 1% of the total mass of butyl acrylate and triethanolamine.

[0026] (2) Esterification reaction: in parts by mass, 120.00 parts of polyethylene glycol monomethyl ether with a molecular weight of 1200, 43.05 parts of methacrylic acid, 4.08 parts of concentrated sulfuric acid and 1.63 parts of diphenylamine were placed in reaction kettle B, and The temperature was kept at 120° C. for 5 hours to obtain the esterified macromonomer MP. The molar ratio of polyethylene glycol monomethyl ether and methacrylic acid is 1:5, and the dosages of concentrated sulfuric acid and diphenylamine are 2.5% and 1% of the total mass of polyethy...

Embodiment 3

[0029] (1) Amidation reaction: In parts by mass, 116.12 parts of hydroxyethyl acrylate, 40.80 parts of diethanol monoisopropanolamine and 3.14 parts of sodium hydroxide were placed in reactor A, and kept at 90°C for 2 hours, The amide small alcohol amine monomer NP is obtained. The molar ratio of hydroxyethyl acrylate and diethanol monoisopropanolamine is 4:1, and the amount of sodium hydroxide is 2% of the total mass of hydroxyethyl acrylate and diethanol monoisopropanolamine.

[0030] (2) Esterification reaction: in parts by mass, 200.00 parts of polyethylene glycol monomethyl ether with a molecular weight of 2000, 34.44 parts of methacrylic acid, 8.21 parts of concentrated sulfuric acid and 3.52 parts of phenothiazine were placed in reactor B, Keep the temperature at 110° C. for 4 hours to obtain the esterified macromonomer MP. The molar ratio of polyethylene glycol monomethyl ether and methacrylic acid is 1:4, and the consumption of concentrated sulfuric acid and phenothi...

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Abstract

The invention discloses a preparation method of an ester early-strength polycarboxylic acid water reducing agent. The technical scheme is as follows: the preparation method comprises the following steps: preparing amide small monomer by amidation reaction, preparing esterified big monomer by esterification reaction, and carrying out free radical copolymerization with other unsaturated monomers to obtain the ester early-strength polycarboxylic acid water reducing agent. The product has excellent early-strength property, and can effectively enhance the early strength of the concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of an ester early-strength polycarboxylate water reducer. Background technique [0002] Polycarboxylate superplasticizer is a new type of concrete additive, which can improve the fluidity of concrete mixture, or greatly reduce the water consumption of concrete mixture while maintaining the same fluidity, so it is indispensable for the preparation of high-performance concrete components. [0003] Due to the free radical polymerization preparation method adopted by polycarboxylate superplasticizer, products used in different projects can be obtained by means of molecular design and molecular tailoring. It has been widely used in various engineering fields. With the development of social economy, the demand for prefabricated components and high-strength pipe piles has increased, and there is a large demand for early-strength polycarboxyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/06C08F228/02C08F220/58C08F220/54C04B24/16C04B103/30
Inventor 方云辉林艳梅林庆昌柯余良沈建荣张小芳罗小峰郭鑫祺麻秀星
Owner KZJ NEW MATERIALS GROUP CO LTD
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