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Carboxylic acid concrete water reducing agent containing unsaturated polyether and its prepn

A concrete water-reducing agent and unsaturated technology, applied in the preparation of the above-mentioned water-reducing agent, in the field of polycarboxylate concrete water-reducing agent, can solve the problems of poor fluidity, large slump loss, environmental pollution, etc., and achieve dispersibility. Good, small slump loss, the effect of simplifying the synthesis process

Inactive Publication Date: 2007-07-18
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a carboxylic acid concrete water reducer containing unsaturated polyether, to overcome the existing water reducer's poor fluidity, large slump loss, and environmental pollution.

Method used

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  • Carboxylic acid concrete water reducing agent containing unsaturated polyether and its prepn
  • Carboxylic acid concrete water reducing agent containing unsaturated polyether and its prepn

Examples

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Effect test

Embodiment 1

[0027] Get 1 molar portion of sodium methacryl sulfonate (B), mix it with 25% sulfonic acid aqueous solution, join in the glass reactor of 250ml equipped with stirrer, thermometer, dropping funnel, reflux condenser, stir and heat up. Take 3.5 molar parts of acrylic acid (A) and 1.5 molar parts of acrylic alcohol ethylene oxide polyether B-400 (C) by molar ratio to make a 25% mixed aqueous solution, acrylic alcohol ethylene oxide polyether B-400 (n=4) the unsaturation value mmol / g≥2, the hydroxyl value mgKOH / g is 150±10. Take ammonium persulfate according to 0.3% of the total mass of the polymer to form a 25% aqueous solution. Add about 1 / 4 ammonium persulfate solution dropwise at 65°C, add the mixed aqueous solution of the polymerization reactant dropwise at 80°C, add the initiator and the mixed aqueous solution dropwise every 0.5h, and add dropwise in 4 times. Heat up after dripping, continue to react at 85-90°C for 4h, cool after the reaction, and neutralize with 40% sodium...

Embodiment 2

[0029] Get 1 molar portion of sodium methacryl sulfonate (B), mix it with 25% sulfonic acid aqueous solution, join in the glass reactor of 250ml equipped with stirrer, thermometer, dropping funnel, reflux condenser, stir and heat up. Take 3 molar parts of methacrylic acid (A) and 1.5 molar parts of acryl alcohol ethylene oxide polyether B-400 (C) in molar ratio to make a 25% mixed aqueous solution, acryl alcohol ethylene oxide polyether B The unsaturation value of -400 (n=4) is mmol / g≥2, and the hydroxyl value mgKOH / g is 150±10. Take ammonium persulfate according to 0.6% of the total mass of the polymer to form a 25% aqueous solution. At 70°C, start to drop about 1 / 4 of the ammonium persulfate solution and about 1 / 4 of the mixed aqueous solution, add the initiator and the mixed aqueous solution dropwise every 0.5h, and finish adding dropwise in 4 times. Heat up after dripping, continue to react at 80-90°C for 4 hours, cool after the reaction, and neutralize with 40% sodium hy...

Embodiment 3

[0031] Get 1 molar portion of sodium methacrylsulfonate (B), mix it with 35% sulfonic acid aqueous solution, join in the glass reactor of 250ml equipped with stirrer, thermometer, dropping funnel, reflux condenser, stir and heat up. Take 3.5 mole parts of acrylic acid (A) and 1.25 mole parts of acrylic acid propylene oxide polyether B-600 (C) in molar ratio to make a 35% mixed aqueous solution, and acryl alcohol propylene oxide polyether B-600 (n =10) the unsaturation value mmol / g≥4.5, the hydroxyl value mgKOH / g is 150±10. Take ammonium persulfate according to 0.3% of the total mass of the polymer to form a 35% aqueous solution. Add about -1 / 5 ammonium persulfate solution dropwise at 65°C, add dropwise about 1 / 5 of the mixed aqueous solution of the polymerization reactant at 70°C, add the initiator and the mixed aqueous solution dropwise every 0.8h, and add dropwise in 5 times use up. Heat up after dripping, continue to react at 85-90°C for 5h, cool after the reaction, and n...

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Abstract

The present invention aims at providing one kind of carboxylic acid concrete water reducing agent containing unsaturated polyether superior to available concrete water reducing agent, which has poor flowability, great slump loss and environmental pollution. The concrete water reducing agent of the present invention is prepared through copolymerization of three kinds of monomer, including unsaturated carboxylic acid, unsaturated sulfonic acid and unsaturated polyether. The concrete water reducing agent of the present invention has high water reducing effect, good flowability, high dispersivity, low slump loss and no environmental pollution.

Description

(1) Technical field [0001] The invention relates to a polycarboxylic acid concrete water reducer, in particular to a carboxylic acid concrete water reducer containing unsaturated polyether, and a preparation method of the above water reducer. (2) Background technology [0002] Concrete superplasticizer is a kind of surfactant, its molecular structure is composed of various hydrophilic groups and hydrophobic groups, etc., and it belongs to water-soluble dispersant. With the development of concrete technology today, admixture is one of the essential components. In other words, the technical level of concrete admixture will directly affect the development of concrete technology and even the development of a country's engineering technology. [0003] From the 1930s to the 1960s, during the application and development of ordinary water reducers, the early water reducers were mainly organic compounds such as sodium rosinate, sodium lignosulfonate, and stearate. It is mainly to im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C04B103/30
Inventor 寿崇琦康杰分邢希学宋南京尚盼
Owner UNIV OF JINAN
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