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Ether-ester copolymerization viscosity-reduction-type polycarboxylate superplasticizer and preparation method thereof

A technology of viscous polycarboxylic acid and water reducing agent, applied in the field of building admixtures, can solve problems such as limitation of wide use, and achieve the effects of improving steric hindrance, improving bleeding, and simple preparation process

Active Publication Date: 2020-01-03
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the viscosity regulator of this technical scheme is mixed in the concrete with 10~30%, and the higher dosage just can bring into play effect, has limited its extensive use

Method used

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  • Ether-ester copolymerization viscosity-reduction-type polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Take each raw material component by the following parts by weight: 70 parts by weight of 4-hydroxybutyl vinyl polyoxyethylene base ether (VPEG molecular weight 4000), 40 parts by weight of methoxy polyethylene glycol methacrylate, 8 parts by weight of acrylic acid, 6 parts by weight of hydroxyethyl acrylate, 2 parts by weight of 4-(1-carboxyvinyl) benzoic acid, 2 parts by weight of unsaturated highly branched small monomers, 0.5 parts by weight of hydrogen peroxide, triacetoxy 0.7 parts by weight of sodium borohydride, 0.35 parts by weight of 3-mercaptoacetic acid-2-methylhexyl ester, 4 parts by weight of potassium hydroxide aqueous solution of 50wt%, 5 parts by weight of aqueous sodium hydroxide solution of 32wt%, and the rest are deionized water , adjusted to 50% solid content.

[0032] (2) Dissolve acrylic acid and 2-methylhexyl 3-mercaptoacetate in 15 parts by weight of deionized water, and adjust the pH to 5.5 to 6.0 with 50 wt % potassium hydroxide aqueous sol...

Embodiment 2

[0037] (1) Weigh 60 parts by weight of each raw material component 4-hydroxybutyl vinyl polyoxyethylene base ether (VPEG molecular weight 4500), 50 parts by weight of methoxypolyethylene glycol methacrylate, acrylic acid 6 parts by weight, 3 parts by weight of hydroxyethyl methacrylate, 3 parts by weight of 4-(1-carboxyvinyl) benzoic acid, 1 part by weight of unsaturated highly branched small monomer, 0.6 parts by weight of sodium persulfate, dihydrochloric acid 0.8 parts by weight of hydrazine, 0.4 parts by weight of 3-mercaptoacetic acid-2-methylhexyl ester, 2 parts by weight of potassium hydroxide aqueous solution of 50wt%, 6 parts by weight of aqueous sodium hydroxide solution of 32wt%, all the other are deionized water, adjusted to 50% solids.

[0038] (2) Dissolve acrylic acid and 2-methylhexyl 3-mercaptoacetate in 15 parts by weight of deionized water, and adjust the pH to 5.5 to 6.0 with 50 wt % potassium hydroxide aqueous solution to obtain the first solution; hydrazi...

Embodiment 3

[0043] (1) Take each raw material component by the following parts by weight: 80 parts by weight of 4-hydroxybutyl vinyl polyoxyethylene base ether (VPEG molecular weight 6000), 25 parts by weight of methoxy polyethylene glycol methacrylate, 7 parts by weight of methacrylic acid, 3 parts by weight of hydroxypropyl acrylate, 5 parts by weight of 4-(1-carboxyvinyl) benzoic acid, 3 parts by weight of unsaturated highly branched small monomers, 0.4 parts by weight of ammonium persulfate, three parts by weight 0.7 parts by weight of sodium acetoxy borohydride, 0.5 parts by weight of 2,4-diphenyl-4-methyl-1-pentene, 3 parts by weight of 50 wt % potassium hydroxide aqueous solution, 32 wt % sodium hydroxide aqueous solution 4 parts by weight, and the rest is deionized water, which is adjusted to 50% solid content.

[0044] (2) Dissolve methacrylic acid and 2,4-diphenyl-4-methyl-1-pentene in 15 parts by weight of deionized water, and adjust the pH to 5.5 to 6.0 with 50 wt % potassium ...

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Abstract

The invention discloses an ether-ester copolymerization viscosity-reduction-type polycarboxylate superplasticizer and a preparation method thereof. Raw materials of the polycarboxylate superplasticizer consist of the following components: 4-hydroxybutyl vinyl polyoxyethylene ether, methoxy polyethylene glycol methacrylate, unsaturated monocarboxylic acid, unsaturated carboxylic ester monomers, 4-(1-carboxyvinyl) benzoic acid, unsaturated highly branched small monomers, an oxidizing agent, a reducing agent, a chain transfer agent, a proper amount of a potassium hydroxide aqueous solution, a proper amount of a sodium hydroxide aqueous solution and deionized water. The unsaturated highly branched small monomer is synthesized and introduced into the polycarboxylate superplasticizer together with the benzene-containing rigid small monomer 4-(1-carboxyvinyl) benzoic acid, so that molecular conformation of the polycarboxylate superplasticizer can be more extended, the steric hindrance effectof the side chain of the polycarboxylate superplasticizer is further improved, and therefore, viscosity of concrete is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to an ether-ester copolymerized viscosity-reducing polycarboxylate water-reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer, as the third generation superplasticizer, has the outstanding advantages of high water reducing rate, good slump retention effect, low dosage and strong designability of molecular structure. At present, the polycarboxylate superplasticizers on the market can well meet the construction requirements of low water-binder ratio concrete due to their high water-reducing rate. The direction of development, the water-binder ratio continues to decrease, the viscosity of the concrete increases accordingly, and the flow speed slows down. The continued use of conventional polycarboxylate superplasticizers cannot solve the problem of concrete construction performance caused by low water-binder ra...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F212/14C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06
Inventor 赖广兴方云辉郭元强赖华珍林艳梅李格丽柯余良钟丽娜张小芳
Owner KZJ NEW MATERIALS GROUP CO LTD
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