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Phosphate-containing high-adaptability early-strength polycarboxylate superplasticizer, and preparation method and application thereof

An early-strength, polycarboxylic acid technology, applied in the field of high-adaptation early-strength polycarboxylate water reducer and its preparation, can solve the problems of low early strength of concrete, avoid incompatibility problems and achieve good compatibility , The effect of preparation technology is simple

Inactive Publication Date: 2021-05-04
GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of low early strength of concrete mixed with phosphoric acid-based superplasticizers, the present invention provides a highly adaptable early-strength polycarboxylate superplasticizer containing phosphoric acid ester acrylamide functional monomers, in which phosphoric acid Water agent adaptability, amide group neutralizes the retarding effect of phosphate ester, ensuring the early strength of concrete

Method used

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  • Phosphate-containing high-adaptability early-strength polycarboxylate superplasticizer, and preparation method and application thereof
  • Phosphate-containing high-adaptability early-strength polycarboxylate superplasticizer, and preparation method and application thereof
  • Phosphate-containing high-adaptability early-strength polycarboxylate superplasticizer, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A highly adaptable early-strength polycarboxylate water reducer containing phosphate, prepared by the following method:

[0038] 1) The first feeding: mix 810g water and 90g allyl polyoxyethylene ether (M n =1500g / mol) into the reactor, stir to obtain the mass concentration of 10% allyl polyoxyethylene ether aqueous solution, and then add 0.5g mass concentration of 25% hydrogen peroxide to control the temperature of the reactor at 15°C;

[0039] 2) The second feeding: start to add dropwise the mixed solution of 10g acrylic acid and 10g water, then start to add dropwise 6g mixed aqueous solution containing 0.1g sodium formaldehyde sulfoxylate and 0.5g thioglycolic acid in 2 minutes, then start within 10 minutes Add 30 g of a mixed aqueous solution containing 3 g of 2-acrylamido-ethyl phosphoric acid dropwise, the entire dropping time lasts for 2.0 hours, and continue to mature for 0.5 hours after the dropping;

[0040] 3) Product preparation: After the polymerization r...

Embodiment 2

[0042] A highly adaptable early-strength polycarboxylate water reducer containing phosphate, prepared by the following method:

[0043] 1) Feeding for the first time: mix 538g water and 95g isobutylene polyoxyethylene ether (M n =2000g / mol) joins in the reaction kettle, obtains the isobutylene polyoxyethylene ether aqueous solution that mass concentration is 15% after stirring, and then one-time addition of 0.6g mass concentration is 25% sodium persulfate, and the control reaction kettle temperature is 17 ℃;

[0044] 2) The second feeding: start dropwise adding the mixed solution of 13g sodium acrylate and 13g water, then start dropwise adding 8g mixed aqueous solution containing 0.2gL-ascorbic acid and 0.6g mercaptopropionic acid in 3 minutes, then start dropwise adding within 25 minutes 10g mixed aqueous solution containing 1g of 2-acrylamido-propylphosphoric acid, the entire dropping time lasts for 2.5 hours, and the aging is continued for 1.0 hour after the dropping;

[...

Embodiment 3

[0047] A highly adaptable early-strength polycarboxylate water reducer containing phosphate, prepared by the following method:

[0048] 1) Feeding for the first time: mix 233g water and 100g butyl polyoxyethylene ether (M n =3000g / mol) joins in the reaction kettle, obtains mass concentration after stirring evenly and is the butyl polyoxyethylene ether aqueous solution of 30%, then one-time addition of 0.8g mass concentration is 25% potassium persulfate, controls the reaction kettle temperature at 30°C;

[0049] 2) Feeding for the second time: start to add dropwise the mixed solution of 14g methacrylic acid and 14g water, then start to add dropwise 11g mixed aqueous solution containing 0.3g sodium bisulfite and 0.8g sodium methacrylate sulfonate in 4 minutes, then Start to add 30 g of mixed aqueous solution containing 3 g of 2-acrylamido-butylphosphoric acid dropwise within 30 minutes, the whole dropping time lasts for 3.0 hours, and continue to ripen for 1.5 hours after the d...

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Abstract

The invention provides a phosphate-containing high-adaptability early-strength polycarboxylate superplasticizer, and a preparation method and application thereof, and relates to the technical field of concrete admixtures. The phosphate-containing high-adaptability early-strength polycarboxylic acid water reducer is prepared by copolymerizing 90 to 110 parts of unsaturated polyether macromonomer, 10 to 20 parts of unsaturated carboxylic acid and 1 to 6 parts of phosphate-containing acrylamide free radical. A polyacrylic acid derivative and a polyether side chain on the molecular chain of the water reducing agent provide dispersing performance, the phosphate ester-containing polyacrylamide improves the adaptability of the water reducing agent due to the existence of a phosphate group on one hand, and amido balances the retarding effect of the phosphate group on the other hand, and also improves the early strength effect of the product. Therefore, the cement early strength agent has better adaptability and early strength effect when being used for mixing different types of cement and high-mud-content aggregate concrete.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a phosphate-containing high-adaptability early-strength polycarboxylate water reducer and its preparation method and application. Background technique [0002] In the field of civil engineering, polycarboxylate superplasticizers have been widely used to adjust and improve the working performance of concrete, and have gradually developed into an essential basic raw material in the production of high-performance concrete. However, with the increasing awareness of environmental protection in the current society, natural high-quality sand and gravel aggregates are gradually in short supply, and construction recycling waste, machine-made sand, aggregates with high mud content and low-quality fly ash / slag have been widely used in the production of ready-mixed concrete. . However, the high dispersibility of polycarboxylate superplasticizer leads to its low dosage in concret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F230/02C04B24/26C04B103/30
CPCC08F283/065C04B24/246C04B2103/302C08F220/06C08F230/02
Inventor 陈胜利张金龙陈小龙黄福仁钟开红胡贺松
Owner GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD
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