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Star-shaped polycarboxylate superplasticizer with controllable molecular structure and preparation method thereof

A technology of star-shaped polycarboxylic acid and molecular structure is applied in the field of concrete admixtures, which can solve the problems of insufficient initial dispersion performance and high concrete viscosity.

Active Publication Date: 2020-07-07
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention aims to overcome the problems of insufficient initial dispersing performance of the above-mentioned cement dispersant for low water-to-binder ratio, high early viscosity of concrete, etc., and provides a controllable molecular structure with easy-to-obtain raw material sources, low production cost and simple production process. Star polycarboxylate water reducer and preparation method thereof

Method used

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  • Star-shaped polycarboxylate superplasticizer with controllable molecular structure and preparation method thereof
  • Star-shaped polycarboxylate superplasticizer with controllable molecular structure and preparation method thereof
  • Star-shaped polycarboxylate superplasticizer with controllable molecular structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Step 1) Add 60.0g of ethylenediamine and 452.6g of 2-(phenylthioformylthio)propionic acid into the reactor, under the protection of nitrogen, heat up to 60°C, add 0.26g of concentrated sulfuric acid, and continue to heat up to At 80°C, keep the temperature for 6 hours, then cool down to obtain the acylated product C.

[0061] Step 2) In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen inlet tube, add 51.2g of acylated product C, 14.4g of acrylic acid, 19.6g of hydroxyethyl acrylate phosphate, 200g of polyethylene glycol Monomethyl ether acrylate (Mn=500g / mol), 1.43g of azobisisobutylamidine hydrochloride, and 190.2g of water were mixed, stirred to form a uniform monomer aqueous solution, and N 2 O in the solution 2 discharge, the N 2 A reversible addition-fragmentation chain transfer polymerization reaction was carried out under protection at a reaction temperature of 50°C for 12 hours to obtain a star-shaped polycarboxylate wat...

Embodiment 2

[0063] Step 1) Add 51.5g of diethylenetriamine and 698.5g of 4-cyano-4-(phenylthioformylthio)valeric acid into the reactor, raise the temperature to 60°C under the protection of nitrogen, and add 7.5g Benzenesulfonic acid, continue to heat up to 110°C, keep the temperature constant for 3h, and cool down to obtain the acylated product C.

[0064] Step 2) In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen inlet tube, add 47.1g of acylated product C, 17.2g of methacrylic acid, 39.2g of hydroxyethyl acrylate phosphate, 200g of polyethylene Glycol monomethyl ether methacrylate (Mn=1000g / mol), 3.03g of 4,4'-azobis(4-cyanovaleric acid), and 303.5g of water were mixed and stirred to form a uniform monomer aqueous solution. Access to N 2 O in the solution 2 discharge, the N 2 The reversible addition-fragmentation chain transfer polymerization reaction was carried out under protection, the reaction temperature was 60°C, and the polymerization ...

Embodiment 3

[0066] Step 1) Add 51.5g of diethylenetriamine and 838.1g of 4-cyano-4-(phenylthioformylthio)pentanoic acid into the reactor, raise the temperature to 60°C under the protection of nitrogen, and add 17.8g For 4-dimethylaminopyridine, continue to heat up to 90° C., keep the temperature constant for 5 hours, and cool down to obtain the acylated product C.

[0067] Step 2) In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen inlet tube, add 47.1g of acylated product C, 20.0g of dimethacrylic acid, 21.0g of hydroxyethyl methacrylate phosphate, Mix 200g ethoxylated polypropylene glycol polytetramethylene glycol monomethacrylate (Mn=2000g / mol), 5.76g azobisisobutylamidine hydrochloride, and 288.1g water, and stir to make a uniform aqueous monomer solution , into N 2 O in the solution 2 discharge, the N 2 The reversible addition-fragmentation chain transfer polymerization reaction was carried out under protection, the reaction temperature was ...

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Abstract

The invention provides a star-shaped polycarboxylic acid cement dispersant with a controllable molecular structure and a preparation method of the star-shaped polycarboxylic acid cement dispersant. The star-shaped polycarboxylate superplasticizer with the controllable molecular structure is a star-shaped RAFT chain transfer agent obtained by performing amidation / imidization reaction of polyethylene polyamine and a carboxyl-containing chain transfer agent, and then carrying out reversible addition-fragmentation chain transfer polymerization with unsaturated acid, unsaturated phosphate and an unsaturated macromonomer to obtain the star-shaped polycarboxylate superplasticizer with the controllable molecular structure. The product produced by the invention has the advantages of low mixing amount, high water reducing rate, small slump loss, good cement adaptability, remarkable reduction of slurry viscosity at low water-binder ratio and the like. Reversible addition-fragmentation chain transfer polymerization is adopted, the synthesis method is simple, the production process is clean, and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a star-shaped polycarboxylic acid with controllable molecular structure that can be used as a high-performance water reducer for concrete and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, modern buildings show a trend of super-long-span and super-high-rise development, which puts forward higher requirements for the strength and durability of concrete. Adding high-performance polymer dispersant to concrete is the most effective, economical and convenient technical way to reduce the amount of cement, improve the utilization rate of industrial waste residue, and achieve high durability and performance improvement of concrete. Polycarboxylate superplasticizer has become an important component of modern high-performance concrete because of its excellent water-reducing and dispersing pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F230/02C08F222/06C08F220/06C08F2/38C04B24/26C04B103/30
CPCC08F283/065C08F2/38C04B24/246C04B2103/30C08F2438/03C08F230/02C08F222/06C08F220/06
Inventor 刘加平王秀梅冉千平舒鑫杨勇张建纲严涵赵红霞
Owner JIANGSU SOBUTE NEW MATERIALS
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