A kind of graft copolymerization high-performance polycarboxylate water-reducer of ternary block macromonomer and its preparation method

A ternary block and macromonomer technology, used in the field of concrete admixtures, can solve the problems of poor slump retention and no slow release properties of water reducers, and achieve excellent slump retention, low air content, adaptable effect

Inactive Publication Date: 2017-01-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water reducer has the characteristics of good air-entraining performance, small size of bubbles introduced into the concrete, uniform distribution, and high water reducing rate, which can improve the durability of concrete. However, the water reducer has poor slump retention performance and has no certain sustained release

Method used

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  • A kind of graft copolymerization high-performance polycarboxylate water-reducer of ternary block macromonomer and its preparation method
  • A kind of graft copolymerization high-performance polycarboxylate water-reducer of ternary block macromonomer and its preparation method
  • A kind of graft copolymerization high-performance polycarboxylate water-reducer of ternary block macromonomer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of the above-mentioned three-element block macromonomer graft copolymerization high-performance polycarboxylate water reducer, the specific steps are as follows:

[0036] A three-necked flask equipped with a stirrer was placed in a temperature-controlled electric heating mantle, and 155.1 g of isopentenol polyoxyethylene ether with a molecular weight of 2600, 27.4 g of ternary block polyether, 25.2 g of maleic anhydride and 200 g of water were added, Stir evenly and heat up to 75°C; then add 7 g of ammonium persulfate at one time, and simultaneously add dropwise 10.15 g of an aqueous solution of ascorbic acid (which contains 0.15 g of ascorbic acid) and 10.3 g of an aqueous solution of thioglycolic acid (which contains 0.3 g of thioglycolic acid), and after 4 hours After the dropwise addition is completed (the dropping rate is about 0.4ml / min), continue to insulate and mature for 1 hour, add 60g of 30% NaOH solution to neutralize the pH of the syst...

Embodiment 2

[0040] The preparation method of the above-mentioned three-element block macromonomer graft copolymerization high-performance polycarboxylate water reducer, the specific steps are as follows:

[0041] Place the three-necked flask equipped with a stirrer in a temperature-controlled electric heating mantle, add 146g of isopentenol polyoxyethylene ether with a molecular weight of 5500, 36.5g of ternary block polyether, 25.2g of maleic anhydride and 200g of water, and stir evenly , the temperature was raised to 75°C; then 7g of ammonium persulfate was added at one time, and at the same time, 10.15g of an aqueous solution of ascorbic acid (which contained 0.15g of ascorbic acid), and 10.3g of an aqueous solution of thioglycolic acid (which contained 0.3g of thioglycolic acid) were added dropwise, and after 4 hours, the Complete (dropping speed is about 0.4ml / min), continue to heat preservation and aging for 1 hour, add 60g of 30% NaOH solution to neutralize the pH of the system to 6...

Embodiment 3

[0045] The preparation method of the above-mentioned three-element block macromonomer graft copolymerization high-performance polycarboxylate water reducer, the specific steps are as follows:

[0046] Place the three-necked flask equipped with a stirrer in a temperature-controlled electric heating mantle, add 122.6 g of isopentenol polyoxyethylene ether with a molecular weight of 2600, 41.1 g of ternary block polyether, 25.2 g of maleic anhydride and 200 g of water, and stir Evenly, the temperature was raised to 75°C; then 7g of ammonium persulfate was added at one time, and at the same time, 10.15g of an aqueous solution of ascorbic acid (which contained 0.15g of ascorbic acid) and 10.3g of an aqueous solution of thioglycolic acid (which contained 0.3g of thioglycolic acid) were added dropwise. After the addition is completed (the dropping rate is about 0.4ml / min), continue to heat and ripen for 1 hour, add 60g of 30% NaOH solution to neutralize the pH of the system to 6-7, an...

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Abstract

The invention discloses a ternary block macromonomer graft copolymerization high-property polycarboxylic acid water-reducing agent and a preparation method thereof. The preparation method comprises the following steps: dissolving a ternary block polyether macromonomer, a non-block polyether macromonomer and maleic anhydride into deionized water; then continuously stirring at a certain temperature, and respectively adding an initiating agent, a reducing agent and a chain transfer agent; and after the reaction is completed, regulating pH to neutrality to obtain the ternary copolymerization high-property polycarboxylic acid water-reducing agent. The water-reducing agent disclosed by the invention can enable the concrete to achieve higher flowing property under the condition of lower water cement ratio; because epoxy propane contained in the ternary block polyether macromonomer has an agglomeration effect and has high space steric effect, the synthesized polycarboxylic acid system water-reducing agent has more excellent dispersing retentivity, the water-reducing agent has lower air content when being used for the concrete, and the water-reducing agent is a multifunctional and high-adaptability high-property water-reducing agent which integrates water reduction, slump loss resistance and low air entrainment into a whole.

Description

technical field [0001] The invention relates to a three-element block macromonomer graft copolymerization high-performance polycarboxylate water reducer and a preparation method thereof, belonging to the field of concrete admixtures. Background technique [0002] With the development of modern science and technology and production, especially the concept of "high-performance concrete", the use of concrete pays more attention to the durability, workability and adaptability of concrete in harsh environments, which requires the water reducer to have Certain air entrainment and good slump retention. The new high-efficiency polycarboxylate concrete superplasticizer must adopt the principle of molecular design to meet the needs of people to prepare low-water-binder ratio, high-strength, and high-durability concrete. The polycarboxylate high-efficiency water reducer with comb-shaped molecular structure is suitable for the preparation of high-strength and ultra-high-strength concre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C08F283/06C08F222/06
Inventor 马保国王允栋黄健谭洪波方晨炜戚长亚
Owner WUHAN UNIV OF TECH
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