Polycarboxylate superplasticizer aiming at slow initial reaction of high-grade concrete and preparation method thereof

A concrete and high-grade technology, applied in the field of concrete admixtures, can solve the problems of increasing the workload of mixing plant personnel, prolonging the concrete production time, and affecting the normal construction of the construction site, so as to improve the viscosity of concrete, increase the water-reducing rate and retention , the effect of increasing the conversion rate

Active Publication Date: 2020-03-17
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

Recently, technicians have encountered another problem in verifying the formula of high-grade concrete. Usually, high-grade concrete can be completely produced after 60-90 seconds of mass production when ready-mixed. Unable to discharge materials, increasing the amount of admixture can not improve, and bleeding and segregation will easily occur in the later stage, which will virtually prolong the concrete production time, affect the normal construction of the site, and increase the workload of the mixing plant personnel, etc.
[0003] The relevant patents and literatures of polycarboxylate superplasticizers that are specially designed for high-grade concrete with slow initial reaction have not been reported.

Method used

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  • Polycarboxylate superplasticizer aiming at slow initial reaction of high-grade concrete and preparation method thereof
  • Polycarboxylate superplasticizer aiming at slow initial reaction of high-grade concrete and preparation method thereof
  • Polycarboxylate superplasticizer aiming at slow initial reaction of high-grade concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The polycarboxylate water-reducer and its preparation method aiming at the slow initial response of high-grade concrete according to the present invention comprise the following steps:

[0031] 1) Dissolve 100 g of betaine and 77 g of acryloyl chloride in 100 mL of DMF, react in an ice-water bath (0° C.) for 2 hours at a constant temperature, and remove the solvent to obtain modified betaine.

[0032] 2) Dissolve 100 g of glucose and 50 g of acryloyl chloride in 90 mL of DMF, react in an ice-water bath (0° C.) at a constant temperature for 2 h, and remove the solvent to obtain glucosyl acrylate.

[0033] 3) At room temperature, dissolve 260g of ethylene glycol monovinyl polyglycol ether, 22g of modified betaine, 5g of glucosyl acrylate, 20g of methacrylic acid, and 3.8g of potassium persulfate in 366g of deionized water to prepare A1 solution;

[0034] 4) Dissolve 20g of methacrylic acid and 3.2g of mercaptoethanol in 60g of deionized water to prepare B1 solution;

[...

Embodiment 2

[0038] The polycarboxylate water-reducer and its preparation method aiming at the slow initial response of high-grade concrete according to the present invention comprise the following steps:

[0039] 1) Dissolve 100 g of citric acid and 47 g of acryloyl chloride in 90 mL of DMF, react in an ice-water bath (0° C.) at a constant temperature for 2 h, and remove the solvent to obtain citric acid acrylate.

[0040] 2) At room temperature, dissolve 260g ethylene glycol monovinyl polyglycol ether, 5g modified betaine, 30g citric acid acrylate, 20g fumaric acid, 0.7g hydrogen persulfide, 2.0g ammonium persulfate in 384g deionized water, configured as A2 solution;

[0041] 3) Dissolve 20g of acrylic acid and 3.2g of mercaptoacetic acid in 60g of deionized water to form B2 solution;

[0042] 4) Dissolve 1.5g vitamin C in 70g deionized water to prepare C2 solution;

[0043] 5) Add B2 and C2 to the A2 solution at a constant speed, the time for B2 to be added is 2 hours, and the time fo...

Embodiment 3

[0045] The polycarboxylate water-reducer and its preparation method aiming at the slow initial response of high-grade concrete according to the present invention comprise the following steps:

[0046]1) Dissolve 100 g of molasses and 50 g of acryloyl chloride in 90 mL of DMF, react in an ice-water bath (0° C.) at a constant temperature for 2 h, and remove the solvent to obtain molasses acrylate.

[0047] 2) At room temperature, 260g ethylene glycol monovinyl polyglycol ether, 18g modified betaine, 24g molasses acrylate, 20g 2-acrylamide-2-methylpropanesulfonic acid, 3.6g ammonium persulfate, Dissolve in 395g deionized water to make A3 solution;

[0048] 3) Dissolve 20g of methacrylic acid and 3.2g of mercaptopropionic acid in 60g of deionized water to form B3 solution;

[0049] 4) Dissolve 1.5g E51 in 70g deionized water to prepare C3 solution;

[0050] 5) Add B3 and C3 to the A2 solution at a constant speed, the time for B2 to be added is 2 hours, and the time for C2 to be ...

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PUM

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Abstract

The invention relates to a polycarboxylate superplasticizer aiming at slow initial reaction of high-grade concrete and a preparation method thereof. The polycarboxylate superplasticizer is formed by free radical polymerization of ethylene glycol monovinyl polyethylene glycol ether, unsaturated acid, modified betaine, unsaturated ester, a chain transfer agent, an initiator and a reducing agent. Proper novel functional monomer modified betaine and unsaturated ester containing polyhydroxy or polycarboxyl are introduced into a polycarboxylic acid side chain, so that the cement dispersing speed ofpolycarboxylic acid is increased, the problem of slow initial reaction of high-grade concrete is solved, the working performance of the concrete is improved, and the advantages of ethylene glycol monovinyl polyethylene glycol ether monomers are exerted.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer with slow initial reaction for high-grade concrete and a preparation method thereof, belonging to the technical field of concrete admixtures. Background technique [0002] The rapid development of social economy has created a broader market for the construction industry. At the same time, it also requires concrete to develop in the direction of high strength and super strength. gelling material. A high amount of cementitious material and a small amount of water will lead to high viscosity of concrete and difficult pumping, which is a problem often encountered in high-grade concrete. Recently, technicians have encountered another problem in verifying the formula of high-grade concrete. Usually, high-grade concrete can be completely produced after 60-90 seconds of mass production when ready-mixed. Unable to discharge materials, increasing the amount of admixtures can not improve, and bleeding and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/34C08F220/20C08F220/06C08F220/28C08F222/02C08F220/58C04B24/26C04B103/30
CPCC08F283/065C04B24/2647C04B24/2658C04B2103/302C08F220/34C08F220/20C08F220/06C08F222/02Y02W30/91
Inventor 阿光强阿光城陈志翔徐顺涛王磊
Owner 云南森博混凝土外加剂有限公司
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