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A kind of preparation method of polycarboxylate water-reducing agent for concrete prefabricated components

A technology of prefabricated components and water reducers, which is applied in the field of concrete admixtures, and can solve problems such as excessive air bubbles on the surface, reduced concrete strength in the later stage, and alkali and anti-frost on the surface of concrete products.

Active Publication Date: 2021-05-14
ANHUI CONCH GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the early strength of concrete can be improved through the method of compounding, it will also bring many problems, such as compounding sodium sulfate, which will cause alkali and anti-cream on the surface of concrete products; compounding sodium nitrite will affect the water-reducing effect of polycarboxylic acid The compatibility of the agent, and the composite early strength agent will reduce the later strength of the concrete and affect the durability of the concrete
[0006] In addition, due to the air-entraining properties of the polycarboxylate superplasticizer itself, the surface of the concrete products prepared by the early-strength polycarboxylate superplasticizer for prefabricated components has more air bubbles, which affects its appearance.

Method used

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  • A kind of preparation method of polycarboxylate water-reducing agent for concrete prefabricated components
  • A kind of preparation method of polycarboxylate water-reducing agent for concrete prefabricated components

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A preparation method of polycarboxylate water reducer for concrete prefabricated components, comprising the following steps:

[0043] (1) Put 360g of HPEG-2400 and 200g of deionized water into a four-necked flask, stir evenly, and add 1g of ammonium persulfate;

[0044] (2) Mix 0.55gL-ascorbic acid, 2.0g thioglycolic acid, 40g methacrylic acid, 18g monoethanolamine fumarate and 250g deionized water, stir well to form a mixed solution; control the rate of addition of the mixed solution, within 3h After dropping, continue to stir and react for 2 hours, add 182g of water to obtain a 40% solid polycarboxylate superplasticizer mother liquor;

[0045] (3) Add 50 g of the above-prepared polycarboxylate water-reducer mother liquor to 50 g of water, 10 g of melamine water-reducer, and 0.03 g of defoamer, and stir evenly to obtain a polycarboxylate water-reducer for concrete prefabricated components.

Embodiment 2

[0047] A preparation method of polycarboxylate water reducer for concrete prefabricated components, comprising the following steps:

[0048] (1) Put 360g of HPEG-3000 and 200g of deionized water into a four-necked flask, stir evenly, and add 1.5g of azodiisopropylimidazoline hydrochloride;

[0049] (2) Mix 0.8 g of tartaric acid, 1.0 g of mercaptoethanol, 34 g of acrylic acid, 25 g of monoethanolamine fumarate and 250 g of deionized water, and stir evenly to form a mixed solution; control the rate of addition of the mixed solution, drop it within 3 hours, continue After stirring and reacting for 2 hours, 183.5 g of water was added to obtain a 40% solid polycarboxylate superplasticizer mother liquor;

[0050] (3) Add 50 g of the above-prepared polycarboxylate water reducer mother liquor to 50 g of water, 15 g of melamine water reducer, and 0.05 g of defoamer, and stir evenly to obtain a polycarboxylate water reducer for concrete prefabricated components.

Embodiment 3

[0052] A preparation method of polycarboxylate water reducer for concrete prefabricated components, comprising the following steps:

[0053] (1) Put 360g of HPEG-3000 and 200g of deionized water into a four-necked flask, stir evenly, and add 2.8g of hydrogen peroxide;

[0054](2) Mix 0.9g saffron, 1.0g mercaptoacetic acid, 0.9g mercaptoethanol, 5g fumaric acid, 30g acrylic acid, 35g monoethanolamine fumarate and 250g deionized water, stir well to form a mixed solution; Mix the solution to control the dropping rate, finish dropping within 3 hours, continue to stir and react for 2 hours, then add 196.5g of water to obtain a 40% solid polycarboxylate superplasticizer mother liquor;

[0055] (3) Add 50 g of the above-prepared polycarboxylate water reducer mother liquor to 50 g of water, 18 g of melamine water reducer, and 0.06 g of defoamer, and stir evenly to obtain a polycarboxylate water reducer for concrete prefabricated components.

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Abstract

The invention discloses a preparation method of a polycarboxylate water reducer for concrete prefabricated components, which comprises the following steps: mixing unsaturated polyoxyethylene ether macromonomers with deionized water, stirring evenly, adding an initiator, and continuing Stir; mix unsaturated carboxylic acid, chain transfer agent, monoethanolamine fumarate, reducing agent and deionized water, and stir evenly to prepare a mixed solution, gradually add the mixed solution to the above steps, and the dropwise addition is completed Finally, react for 2 to 4 hours, then add water to adjust the solid content of the system to obtain the mother liquor of polycarboxylate superplasticizer; dilute the mother liquor of polycarboxylate water reducer with water to a mass concentration of 20%, and then mix it with melamine and antifoaming agent are compounded to obtain a polycarboxylate water reducer for concrete prefabricated components. The water-reducing agent has simple preparation process, high water-reducing rate and excellent slump-preserving performance, can greatly increase the early strength and later strength of concrete, and can improve the surface smoothness of concrete products.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a preparation method of a polycarboxylate water reducer for concrete prefabricated components. Background technique [0002] Polycarboxylate superplasticizer, as a new generation of green and environment-friendly high-performance superplasticizer, has excellent compatibility with cement, and has the advantages of low dosage, high water reducing rate and good slump retention. It has been used in the engineering field be widely used. [0003] With the increase of infrastructure construction projects such as railways, highways, and airports, as well as the prefabricated building policy that the country is currently vigorously promoting, the demand for prefabricated components in engineering is increasing. The research is applicable to prefabricated concrete, which can greatly improve the early strength of concrete. The polycarboxylate superplasticizer for pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C04B103/30
CPCC04B40/0039C04B2103/302C04B24/32C04B24/04C04B24/12C04B2103/50C04B22/14C04B24/06C04B24/16C04B24/129C04B22/068
Inventor 熊磊徐文祥肖慧丽王一健沈江平李保军
Owner ANHUI CONCH GRP
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