Allyl polyglycol ether polycarboxylic acid water reducer and synthetic method thereof

A technology based on polyethylene glycol ether and polycarboxylate, which is applied in the field of polycarboxylate water reducer for concrete and its synthesis, can solve the problems of low conversion rate of maleic anhydride and precipitation of maleate, and achieve the goal of maintaining Good slump performance, improved polymerization activity, and reduced cost

Inactive Publication Date: 2012-08-01
CHANGZHOU INST OF CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] What the present invention is to solve is that the conversion rate of maleic anhydride is not high in the polymerization reaction, and the product will have problems such as precipitation of maleate after standing for a period of time, and provides an allyl polyethylene glycol ether polycarboxylic acid reducing Synthesis method of water agent

Method used

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  • Allyl polyglycol ether polycarboxylic acid water reducer and synthetic method thereof
  • Allyl polyglycol ether polycarboxylic acid water reducer and synthetic method thereof
  • Allyl polyglycol ether polycarboxylic acid water reducer and synthetic method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add the maleic anhydride of 2000g allyl polyglycol ether (molecular weight is 2000), the maleic anhydride of 196g, the deionized water of 2000g in the reactor that is equipped with stirrer, thermometer, dropping device, reflux cooler, heat to complete Dissolve, adjust the pH of the reaction system to 4.5 with 210 g of 40% sodium hydroxide solution, then add 1.5 g of ferrous ammonium sulfate, and heat the system to 100°C. With the mixed solution of 36g acrylic acid, 20g 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and 2000g deionized water, after adjusting the pH of the mixed solution to 4.5, and 108g concentration of 35% hydrogen peroxide were added dropwise at the same time Into the reactor, the dropwise addition time is 5h. After the dropwise addition, keep warm for 2h, then naturally cool to 30°C, adjust the pH to 6 with 30% sodium hydroxide solution, and adjust the solid content of the product to 40%. Record the sample as PC-1.

Embodiment 2

[0040] Add the maleic anhydride of 2000g allyl polyglycol ether (molecular weight is 2000), the maleic anhydride of 196g, the deionized water of 2000g in the reactor that is equipped with stirrer, thermometer, dropping device, reflux cooler, heat to complete Dissolve, adjust the pH value of the reaction system to 3.0 with 150 g of sodium hydroxide solution with a mass concentration of 40%, then add 1.5 g of ferrous ammonium sulfate, and heat the system to 100°C. With the mixed solution of 36g acrylic acid, 20g 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and 2000g deionized water, after adjusting the pH of the mixed solution to be 3.0, it is 35% hydrogen peroxide with 108g concentration to be added dropwise to In the reactor, the dropwise addition time is 5h. After the dropwise addition, keep warm for 2h, then naturally cool to 30° C., adjust the pH to 6 with 30% sodium hydroxide solution, and adjust the solid content of the product to 40%. Record the sample as PC-2.

Embodiment 3

[0042] Add the maleic anhydride of 2000g allyl polyglycol ether (molecular weight is 2000), the maleic anhydride of 196g, the deionized water of 2000g in the reactor that is equipped with stirrer, thermometer, dropping device, reflux cooler, heat to complete Dissolve, adjust the pH of the reaction system to 6.0 with 400 g of 40% sodium hydroxide solution, then add 1.5 g of ferrous ammonium sulfate, and heat the system to 100°C. With the mixed solution of 36g acrylic acid, 20g 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and 2000g deionized water, after adjusting the pH of the mixed solution to 6.0, and 108g concentration of 35% hydrogen peroxide were added dropwise at the same time Into the reactor, the dropwise addition time is 5h. After the dropwise addition, keep warm for 2h, then naturally cool to 30°C, adjust the pH to 6 with 30% sodium hydroxide solution, and adjust the solid content of the product to 40%. Record the sample as PC-3.

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Abstract

The invention discloses a synthetic method of an allyl polyglycol ether polycarboxylic acid water reducer. According to the method, allyl ether polyethylene glycol macromers, maleic anhydride (MA), acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and the like are used as main raw materials, a water-soluble hydroperoxide is used as an initiator, a transition metal salt is used as a catalyst, and polymerization is initiated in a specific pH range (2.5-6.0). The method makes the content of maleic acid in a polymer be greatly improved, the water reduction effect be good, and the product cost be greatly reduced and the product applicability be extensive especially replacing parts of acrylic acid by maleic acid, so the method is convenient for industrialized production and popularization.

Description

technical field [0001] The invention relates to a polycarboxylate water-reducer for concrete and a synthesis method thereof, in particular to an allyl polyethylene glycol ether polycarboxylate water-reducer and a synthesis method. Background technique [0002] Polycarboxylate superplasticizers are known as the third-generation high-performance superplasticizers for their excellent performance and environmental protection features. At present, the main research products are ester and ether polycarboxylate superplasticizers. Ester polycarboxylate superplasticizers mainly use (meth)acrylic acid and (meth)acrylic acid polyethylene glycol ester macromonomers as raw materials, and the price of raw materials is high. Although these products have excellent performance, their cost performance is slightly lower than Naphthalene superplasticizer. The main raw materials of ether polycarboxylate superplasticizers are allyl polyethylene glycol and maleic anhydride. The price of ether pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F290/06
Inventor 陆居山贾树勇王公应王红丹
Owner CHANGZHOU INST OF CHEM
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