Enhanced polycarboxylate superplasticizer and preparation method thereof

A polycarboxylic acid, enhanced technology, applied in the field of enhanced polycarboxylic acid water reducing agent and its preparation, can solve the problems of affecting the enhancement effect and strength stability, poor stability and adaptability, difficult to be effectively promoted, etc. Good adaptability, enhanced stability, improved pore structure and effect of interface structure

Active Publication Date: 2019-04-05
福建路桥翔通建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no product in the domestic market that directly synthesizes enhanced polycarboxylate superplasticizer through molecular structure design.
Concrete reinforcing agents prepared by compounding methods have relatively poor stability and adaptability due to complex components and compati...

Method used

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  • Enhanced polycarboxylate superplasticizer and preparation method thereof
  • Enhanced polycarboxylate superplasticizer and preparation method thereof
  • Enhanced polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Esterification reaction: with 100g methacrylic acid (MAA), 200g triethanolamine, 4.4g catalyst (concentrated sulfuric acid) and 0.4g inhibitor (by hydroquinone and phenothiazine by the mass ratio of 0.8:1.2 Composition) into the reactor, under constant stirring (stirring rate is 150rpm, the same below), raise the temperature of the reactor to 110°C and react for 5h, then cool to 35°C, add 2g of alkali (potassium hydroxide) to obtain The reaction product of functional monomers.

[0029] (2) Copolymerization reaction: 150g methallyl polyoxyethylene ether (TPEG, number average molecular weight is 2500g / cm 3 ) and 180g of distilled water were added to a four-necked flask, and the temperature was raised to 45°C with stirring. After the TPEG was completely dissolved, 0.9g of a chain initiator (ammonium persulfate) was added, and then 12g of acrylic acid and 8g of acrylic acid containing The reaction product of the esterified functional monomer and the mixed solution of 1...

Embodiment 2

[0031] (1) Esterification reaction: with 100gMAA, 200g diethanol monoisopropanolamine, 4.4g catalyst (being specifically concentrated sulfuric acid) and 0.35g polymerization inhibitor (by hydroquinone and phenothiazine by the quality of 1.2:0.8 Specific composition) into the reactor, under constant stirring, the temperature of the reactor was raised to 130°C for 3 hours, then cooled to 50°C, and 1.5g of alkali (sodium hydroxide) was added to obtain a reaction product containing esterified functional monomers.

[0032] (2) Copolymerization reaction: 150g TPEG (the number average molecular weight is 2300g / cm 3 ) and 180g of distilled water were added to a four-necked flask, and the temperature was raised to 70°C with stirring. After the TPEG was completely dissolved, 1.0g of chain initiator (potassium persulfate) was added, and then 12g of acrylamide and 8g of acrylamide obtained in step (1) were added dropwise. Contain the reaction product of esterified functional monomer and t...

Embodiment 3

[0034](1) Esterification reaction: 100g MAA, 235g triisopropanolamine, 4.0g catalyst (specifically concentrated sulfuric acid) and 0.3g polymerization inhibitor (composed of hydroquinone and phenothiazine in a mass ratio of 1:1 ) into the reaction kettle, and under constant stirring, the temperature of the reaction kettle was raised to 120° C. for 4 hours, cooled to 40° C., and 2 g of alkali (potassium hydroxide) was added to obtain a reaction product containing an esterification functional monomer.

[0035] (2) Copolymerization reaction: 150g TPEG (the number average molecular weight is 2400g / cm 3 ) and 180g of distilled water were added to a four-necked flask, and the temperature was raised to 55°C with stirring. After TPEG was completely dissolved, 1.0g of chain initiator (sodium persulfate) was added, and then 15g of acrylic acid and 12g of acrylic acid containing The reaction product of the esterified functional monomer and the mixed solution (mixed solution A) of 20g wat...

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Abstract

The invention belongs to the field of water reducing agents and particularly discloses an enhanced polycarboxylate superplasticizer and a preparation method thereof. The method includes: (1) subjecting, by weight, 50-150 parts of methacrylic acid, 50-250 parts of an alcohol amine compound, 1-5 parts of a catalyst and 0.1-3 parts of a polymerization inhibitor to esterification reaction at 110-130 DEG C for 3-5h, cooling to 35-50 DEG C, and adding alkali to obtain a reaction product containing an esterified functional monomer; (2) subjecting, by weight, 100-200 parts of methyl allyl polyoxyethylene ether, 10-20 parts of unsaturated carboxylic acid and 5-20 parts of the reaction product containing the esterified functional monomer and obtained in the step (1) to polymerization reaction in existence of, by weight, 0.5-1.5 parts of a chain initiator and 0.4-0.8 part of a chain transfer agent to obtain mother liquor of the enhanced polycarboxylate superplasticizer. The enhanced polycarboxylate superplasticizer is capable of promoting hydration reaction of cement, enabling complete hydration of large cement particles, promoting hydration product growth, improving a porous structure and aninterface structure and improving concrete structural compactness and is high in adaptability and stability.

Description

technical field [0001] The invention belongs to the field of water reducers, and in particular relates to a reinforced polycarboxylate water reducer and a preparation method thereof. Background technique [0002] As a new functional admixture proposed by domestic scholars and manufacturers in recent years, concrete reinforcing agent not only has better performance of concrete mixture, but also can save 10-15% of cement consumption. According to the records of existing data, the main function of concrete reinforcing agent is to reduce the surface energy of cement through high dispersion, improve the dispersion of cement aggregate particles, and promote the hydration of cement, thereby increasing the strength of concrete and reducing the amount of cement; The second is to use various reinforcing components to promote the tricalcium aluminate (C 3 A) and tetracalcium aluminoferrite (C 4 The hydration of AF) plays a role in stimulating the activity of cement, increasing the st...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F222/22C08F220/06C08F220/56C04B24/26C04B103/30
CPCC04B24/2694C08F283/065C04B2103/302C08F222/103C08F222/102
Inventor 康净鑫陈吓敏黄永毅
Owner 福建路桥翔通建材科技有限公司
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