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High-performance polycarboxylate water reducing agent and low-temperature one-step preparation method thereof

A technology of polycarboxylate and water reducing agent, applied in the field of concrete admixtures, can solve the problems of high production cost, high reaction temperature, long reaction period and the like, and achieve the effects of simple operation, good dispersion performance and high cost performance

Inactive Publication Date: 2011-04-27
HEBEI SANKAISHENFA SCI & TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has relatively complex process, long reaction cycle, high reaction temperature and high production cost.

Method used

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  • High-performance polycarboxylate water reducing agent and low-temperature one-step preparation method thereof
  • High-performance polycarboxylate water reducing agent and low-temperature one-step preparation method thereof
  • High-performance polycarboxylate water reducing agent and low-temperature one-step preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 345.6 g of deionized water and 433.7 g of macromonomer propylene alcohol polyoxyethylene ether into a 1000 mL four-necked flask equipped with an electric stirrer, a thermometer, a condenser, and a dropping device, and heat and stir to dissolve them.

[0028] At a temperature of 40° C., add 16.05 g of 27.5% hydrogen peroxide and stir evenly.

[0029] Thereafter, 94.7 g of an aqueous acrylic acid solution having a concentration of 70% was added dropwise to the reaction flask over 3 hours. At the same time, a mixed solution of 1.25 g of ascorbic acid, 2.3 g of thioglycolic acid and 110 g of deionized water was added dropwise to the reaction flask within 3.5 hours.

[0030] After the dropping, the reaction was continued at 40° C. for 2.5 hours.

[0031] Use 32% ionic membrane liquid alkali to adjust the pH at 6.0-7.0. Afterwards, it is diluted with water to the required concentration to obtain the product PCA-1.

Embodiment 2

[0033] Add 345.6 g of deionized water and 433.7 g of macromonomer isobutylene alcohol polyoxyethylene ether into a 1000 mL four-necked flask equipped with an electric stirrer, a thermometer, a condenser, and a dropping device, and heat and stir to dissolve them.

[0034] At a temperature of 40° C., add 16.05 g of 27.5% hydrogen peroxide and stir evenly.

[0035] Thereafter, 94.7 g of an aqueous acrylic acid solution having a concentration of 70% was added dropwise to the reaction flask over 3 hours. At the same time, a mixed solution of 1.25 g of ascorbic acid, 2.3 g of thioglycolic acid and 110 g of deionized water was added dropwise to the reaction flask within 3.5 hours.

[0036] After the dropping, the reaction was continued at 40° C. for 2.5 hours.

[0037] Use 32% ionic membrane liquid alkali to adjust the pH at 6.0-7.0. Afterwards, it is diluted with water to the required concentration to obtain the product PCA-2.

Embodiment 3

[0039] Add 345.6 g of deionized water and 433.7 g of macromonomer isopentenol polyoxyethylene ether into a 1000 mL four-necked flask equipped with an electric stirrer, a thermometer, a condenser, and a dropping device, and heat and stir to dissolve them.

[0040] At a temperature of 40° C., add 16.05 g of 27.5% hydrogen peroxide and stir evenly.

[0041] Thereafter, 94.7 g of an aqueous acrylic acid solution having a concentration of 70% was added dropwise to the reaction flask over 3 hours. At the same time, a mixed solution of 1.25 g of ascorbic acid, 2.3 g of thioglycolic acid and 110 g of deionized water was added dropwise to the reaction flask within 3.5 hours.

[0042] After the dropping, the reaction was continued at 40° C. for 2.5 hours.

[0043] Use 32% ionic membrane liquid alkali to adjust the pH at 6.0-7.0. Afterwards, it is diluted with water to the required concentration to obtain the product PCA-3.

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Abstract

The invention discloses a high-performance polycarboxylate water reducing agent and a low-temperature one-step preparation method thereof. In the invention, high-activity isopentene alcohol polyethenoxy ether or isobutylene alcohol polyethenoxy ether large monomer and acrylic acid react in a water solution at a low temperature (30-50 DEG C) to obtain the high-performance polycarboxylate water reducing agent in a two-dropping one-step mode. The water reducing agent has the advantages of high water reducing rate, low doped amount, high dispersity, favorable slump retaining property, wide applicability and high cost performance, and is suitable for various types of cement; and when the water reducing agent is used, more powdered ores and fly ash can substitute cement. The preparation method is simple for operation, and has the advantages of low energy consumption and environmental protection; three wastes are not discharged in the whole production process; and thus, the preparation method is a green synthesis method.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a polycarboxylate high-performance water reducer and a low-temperature one-step preparation method thereof. Background technique [0002] In recent years, my country's construction industry has developed rapidly. The construction of civil, railway, highway, bridge, tunnel, hydropower, seaport, wharf, airport and other national major and key projects cannot do without high-performance concrete, self-compacting concrete, high-strength concrete, High fluidity concrete. The demand for concrete is increasing, the quality requirements are getting higher and higher, and the performance requirements are becoming more and more comprehensive and diversified. Concrete that meets the above requirements is inseparable from high-performance water reducing agents. [0003] At present, the high-performance water reducer is polycarboxylate water reducer. Polycarboxylate high-performance water reducer has...

Claims

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Application Information

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IPC IPC(8): C04B24/24C04B103/30
Inventor 马国栋靳通收王文彬谢红
Owner HEBEI SANKAISHENFA SCI & TECH CORP LTD
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