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Preparation method for hyperbranched polycarboxylic-acid concrete efficient water reducer

A high-efficiency water reducer and polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problems of limited cement dispersion effect, small slump loss, insufficient viscosity reduction effect, etc., to achieve small slump loss and low production cost , The effect of convenient solvent recovery

Active Publication Date: 2015-02-25
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention aims to overcome the problems that the existing polycarboxylate water reducer has limited dispersion effect on cement and insufficient viscosity reduction effect, and provides a preparation method

Method used

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  • Preparation method for hyperbranched polycarboxylic-acid concrete efficient water reducer
  • Preparation method for hyperbranched polycarboxylic-acid concrete efficient water reducer
  • Preparation method for hyperbranched polycarboxylic-acid concrete efficient water reducer

Examples

Experimental program
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Effect test

Embodiment 1

[0044] After fully mixing 48g of polyethylene glycol acrylate (Mn=480g / mol), 49.5g of alkali-neutralized 2-bromomethacrylic acid, 2.87g of cuprous bromide, 6.25g of bipyridyl, 73g of methanol and 73g of water , into N 2 O in the solution 2 discharge, the N 2 Self-condensation vinyl polymerization was carried out under protection, the reaction temperature was 40° C., and the reaction time was 8 hours to obtain a hyperbranched polymer solution. The solvent was removed by rotary evaporation to obtain a hyperbranched polymer with a molecular weight of 17476.

Embodiment 2

[0046] 240g monomer methallyl polyglycol ether (Mn=2400g / mol), 120.5g alkali-neutralized 2-(4-(bromomethyl)phenyl)acrylic acid and 5.74g cuprous bromide , 10.97g three (2-dimethylaminoethyl) amine, 240g toluene fully mixed, pass into N 2 O in the solution 2 discharge, the N 2 Self-condensation vinyl polymerization was carried out under protection, the reaction temperature was 100° C., and the reaction time was 16 hours to obtain a hyperbranched polymer solution. The solvent was removed by rotary evaporation to obtain a hyperbranched polymer with a molecular weight of 35114.

Embodiment 3

[0048] 95g monomer polyethylene glycol methyl ether methacrylate (Mn=950g / mol), 71.6g alkali-neutralized 3-bromo-2-methylenebutanoic acid and 1.02g cuprous bromide, 2.48g After pentamethyldiethylenetriamine, 155.5g methanol and 233g water are fully mixed, N 2 O in the solution 2 discharge, the N 2 Self-condensation vinyl polymerization was carried out under protection, the reaction temperature was 30° C., and the reaction time was 10 h to obtain a hyperbranched polymer solution. The solvent was removed by rotary evaporation to obtain a hyperbranched polymer with a molecular weight of 59877.

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Abstract

The invention provides a preparation method for a hyperbranched polycarboxylic-acid concrete efficient water reducer. The hyperbranched polycarboxylic-acid copolymer is prepared from monomers and b through a self-condensation vinyl polymerization reaction. The produced product has the advantages of low doping amount, high water reducing rate, small slump loss, good cement adaptability, viscosity reduction and the like. By employing self-condensation vinyl polymerization, the synthetic method is simple, the technological requirements are low, the production cost is small, solvent recovery is convenient, and environmental pollution is small.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a hyperbranched polycarboxylic acid that can be used as a high-efficiency water reducer for concrete and a preparation method thereof. Background technique [0002] Cement dispersant (water reducer) has the function of adsorbing on cement particles to inhibit the aggregation of cement particles and improve the dispersibility of concrete during use. [0003] There are many substances used for cement dispersion, including lignin sulfonate, naphthalene sulfonate / formaldehyde polycondensate, phenol / p-aminobenzenesulfonic acid / formaldehyde polycondensate, melamine sulfonate / formaldehyde polycondensate, polycarboxylic acid Comb-like copolymers, etc. [0004] From the perspective of structural characteristics, the former cement dispersants mainly use sulfonic acid groups as adsorption groups, lack effective side chains that provide steric hindrance, si...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/04C08F220/28C04B24/26C04B103/30
Inventor 王秀梅舒鑫刘金芝杨勇张志勇
Owner JIANGSU SOBUTE NEW MATERIALS
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