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Super-long slow-release polycarboxylate superplasticizer as well as preparation method and application

A slow-release polycarboxylate and superplasticizer technology, which is applied in the field of polycarboxylate superplasticizers, can solve the problems of loss of fluidity, poor dispersion and retention effect, and inability to fully meet the requirements of concrete for maintaining fluidity for a long time , to avoid evaporation and small slump loss

Pending Publication Date: 2021-07-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary PCE has poor dispersion and retention effect, and gradually loses its fluidity during the long-distance transportation of commercial concrete, and cannot fully meet the requirements of the construction process for maintaining the fluidity of its concrete for a long time in the construction of super high buildings. Released water reducer to meet construction needs

Method used

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  • Super-long slow-release polycarboxylate superplasticizer as well as preparation method and application
  • Super-long slow-release polycarboxylate superplasticizer as well as preparation method and application
  • Super-long slow-release polycarboxylate superplasticizer as well as preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First place 15g of triethyl citrate in a three-necked flask, use DCM as a solvent, then add triethylamine, the mass of triethylamine is equimolar to (meth)acryloyl chloride, slowly drop and dissolve in two Acryloyl chloride of methyl chloride, the molar ratio of acryloyl chloride to triethyl citrate is 1:1.3, about 1 hour after the dropwise addition, the temperature is raised to 25°C, stirred for 5 hours, and then filtered with suction. The product after the above reaction was washed three times with distilled water, dehydrated with anhydrous magnesium sulfate, suction filtered and distilled. The resulting reddish-brown liquid is triethyl citrate with a polymerizable double bond. Add 0.3g of H 2 o 2 , heated to 45°C. A certain amount of mixed solution A (0.15g thioglycolic acid, 0.12g Vc and a small amount of water) and a certain proportion of mixed solution B (3gAA, 1.82g triethyl ester with a polymerizable double bond and a small amount of water) were slowly added ...

Embodiment 2

[0026] First place 15g of trimethyl citrate in a three-necked flask, use dichloromethane as solvent, then add triethylamine, the quality of triethylamine is 1.1 times that of acryloyl chloride, and slowly drop it in an ice-water bath to dissolve in dichloromethane Acryloyl chloride of methane, the molar ratio of acryloyl chloride to trimethyl citrate is 1:1.4, after about 1 hour of dropwise addition, stir at 25°C for 4 hours, and filter with suction. The product after the above reaction was washed three times with distilled water, dehydrated with anhydrous magnesium sulfate, suction filtered and distilled. The resulting reddish-brown liquid is trimethyl citrate with a polymerizable double bond. Add 0.3g of H 2 o 2 , heated to 45°C. A certain amount of mixed solution A (0.15g mercaptoacetic acid, 0.12gVc and a small amount of water) and a certain proportion of mixed solution B (3gAA, 1.82g trimethyl citrate with polymerizable double bonds and A small amount of water), final...

Embodiment 3

[0028] First place 12g of triethyl citrate in a three-necked flask, use dichloromethane as a solvent, then add triethylamine, the quality of triethylamine is 1.1 times that of methacryloyl chloride, slowly drop it in ice bath conditions and dissolve in two Methacryloyl chloride of methyl chloride, the molar ratio of methacryloyl chloride to triethyl citrate is 1:1.3, after about 1 hour of dropwise addition, stir at 30°C for 5 hours, and filter with suction. The product after the above reaction was washed three times with distilled water, dehydrated with anhydrous magnesium sulfate, suction filtered and distilled. The resulting reddish-brown liquid is triethyl citrate with a polymerizable double bond. Add 0.3g of H 2 o 2 , heated up to 50°C. Slowly add a certain amount of mixed solution A (0.15g thioglycolic acid, 0.12gVc and a small amount of water) and a certain proportion of mixed solution B (3gAA, 2.79g triethyl citrate with polymerizable double bonds and a small amount...

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Abstract

The invention discloses a super-long slow-release polycarboxylate superplasticizer as well as preparation method and application. The method comprises steps of addinga polyether macromonomer and water of which the mass is equal to that of the polyether macromonomer into a reactor with a temperature control device, a stirring device and a dropwise adding device, stirring and dissolving, adding H2O2 of which the mass is 1.2% of that of the polyether macromonomer, stirring and heating to 15-40 DEG C, and slowly dropwise adding the mixed solution A and the mixed solution B at the same time within 2 hours, and keeping the temperature to continuously react for 1 hour to obtain the super-long slow-release polycarboxylate superplasticizer. Triethyl citrate or trimethyl citrate is introduced into molecules of the polycarboxylate superplasticizer, due to the fact that the polycarboxylate superplasticizer contains three ester groups and meanwhile is large in steric hindrance and low in hydrolysis rate, carboxylate radicals can be slowly released for a long time, meanwhile, citric acid released through hydrolysis also has a certain retarding effect, through the synergistic effect of the two, the slump retaining performance of concrete is excellent, and the carboxylic ester-containing PCE is gradually hydrolyzed in an alkaline environment of cement paste, so that carboxylate ions are slowly released, and the effect of keeping the fluidity is achieved.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water reducer (PCE), in particular to an ultra-long slow-release polycarboxylate water reducer, its preparation method and application. Background technique [0002] PCE is a new type of high-efficiency concrete water-reducing agent successfully developed in the mid-1980s. It has low dosage, high water-reducing rate, environmental protection and can significantly improve the strength and dispersion performance of concrete. Ordinary PCE has poor dispersion and retention effect, and gradually loses its fluidity during the long-distance transportation of commercial concrete, and cannot fully meet the requirements of the construction process for maintaining the fluidity of its concrete for a long time in the construction of super high buildings. Released water reducer to meet the construction needs. Contents of the invention [0003] In order to overcome the deficiencies of the above-mentio...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/28C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F220/283
Inventor 张光华冯鹏超张万斌
Owner SHAANXI UNIV OF SCI & TECH