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Preparing method for polycarboxylic admixture

A technology of admixture and polycarboxylic acid, applied in the field of concrete water reducing agent, can solve problems such as bleeding, and achieve the effects of controlling bleeding, increasing water reducing effect and good dispersibility

Inactive Publication Date: 2015-11-11
云南森博混凝土外加剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two technical solutions are to increase the length of the branch chain and improve the dispersion performance of the product. Although the slump protection effect is good, it is easy to cause bleeding.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of preparation method of polycarboxylic acid additive, comprises the weight parts of following component:

[0036] Macromonomer (methacryl polyoxyethylene ether): 350 parts,

[0037] Maleic anhydride: 10 parts,

[0038] Deionized water: 350 parts,

[0039] Solution A: mercaptopropionic acid: 1 part, ascorbic acid: 0.5 part, deionized water: 80 parts;

[0040] Solution B: hydroxyethyl ester: 25 parts, fumaric acid: 5 parts, hydrogen peroxide: 1 part, deionized water: 60 parts;

[0041] The preparation method of the present invention is:

[0042] (1) Put the macromonomer methacryl polyoxyethylene ether, maleic anhydride, and deionized water in parts by weight into the reactor, stir until fully dissolved, and heat up to 55-60°C for later use;

[0043] (2), raise the temperature in the reaction kettle in step (1) to 60-63°C, start to add solution A dropwise, and add solution B dropwise after 30 minutes;

[0044] (3), after the temperature is controlled at 60-62 ...

Embodiment 2

[0046] A kind of preparation method of polycarboxylic acid additive, comprises the weight parts of following component:

[0047] Macromonomer (methacryl polyoxyethylene ether): 360 parts,

[0048] Maleic anhydride: 8 parts,

[0049] Deionized water: 360 parts,

[0050] Solution A: mercaptopropionic acid: 1.5 parts, ascorbic acid: 0.5 parts, deionized water: 80 parts;

[0051] Solution B: hydroxyethyl ester: 26 parts, fumaric acid: 4 parts, hydrogen peroxide: 1.5 parts, deionized water: 64 parts;

[0052]The preparation method of the present invention is:

[0053] (1) Put the macromonomer methacryl polyoxyethylene ether, maleic anhydride, and deionized water in parts by weight into the reactor, stir until fully dissolved, and heat up to 55-60°C for later use;

[0054] (2), raise the temperature in the reaction kettle in step (1) to 60-63°C, start to add solution A dropwise, and add solution B dropwise after 30 minutes;

[0055] (3), after the temperature is controlled at 6...

Embodiment 3

[0057] A kind of preparation method of polycarboxylic acid additive, comprises the weight parts of following component:

[0058] Macromonomer (methacryl polyoxyethylene ether): 380 parts,

[0059] Maleic anhydride: 12 parts,

[0060] Deionized water: 380 parts,

[0061] Solution A: mercaptopropionic acid: 1.5 parts, ascorbic acid: 0.8 parts, deionized water: 85 parts;

[0062] Solution B: hydroxyethyl ester: 28 parts, fumaric acid: 6 parts, hydrogen peroxide: 2 parts, deionized water: 66 parts;

[0063] The preparation method of the present invention is:

[0064] (1) Put the macromonomer methacryl polyoxyethylene ether, maleic anhydride, and deionized water in parts by weight into the reactor, stir until fully dissolved, and heat up to 55-60°C for later use;

[0065] (2), raise the temperature in the reaction kettle in step (1) to 60-63°C, start to add solution A dropwise, and add solution B dropwise after 30 minutes;

[0066] (3), after the temperature is controlled at 6...

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Abstract

The invention provides a preparing method for a polycarboxylic admixture and belongs to the field of concrete water reducing agents. According to the admixture, macromonomer methyl allyl polyethenoxy ether and maleic anhydride carry out a polymerization reaction in a redox system, mercapto propionic acid, hydroxyethyl acrylate and fumaric acid are added, branched chains are enlarged by means of the polymerization reaction in deionized water, and side chains are introduced, so that a molecular structure forms a comb-like structure with hydrophily functional groups such as -SH, -OH and -COOH. By controlling the quantity, temperature and time of the raw materials, the dispersing performance of the admixture is good; meanwhile, the phenomenon of bleeding hardening of concrete can be improved. The quantity of admixtures used in the concrete is small, the admixture can have good dispersity while the water reduction effect is improved, duration is long, slump loss is small, and the amount of adopted cement is reduced.

Description

technical field [0001] The invention relates to the field of concrete water reducers, in particular to a preparation method of a polycarboxylic acid admixture. Background technique [0002] my country is a developing country, and many places are currently carrying out infrastructure construction. Concrete as a building material is essential, and at the same time, water reducing agents for concrete have also undergone rapid development. Most of the current water reducing agents are anionic surfactants, such as lignosulfonate, naphthalenesulfonate formaldehyde polymer, etc. The water reducing agent can disperse the cement particles after being added to the concrete mixture, which can improve its workability, reduce the unit water consumption, improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save cement. [0003] Polycarboxylate superplasticizer is a new type of high-performance superplasticizer. Polycarboxylate high-performance superplas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F222/06C08F222/02C08F4/40C08F2/38C04B24/26C04B103/30
Inventor 阿光强郭海
Owner 云南森博混凝土外加剂有限公司
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