Polycarboxylate water reducing agent by using water as solvent and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of polycarboxylate water reducer, can solve problems such as unpleasant and irritating odor, and achieve the effects of easy control of reaction conditions, simple preparation process and stable performance

Active Publication Date: 2011-05-18
安徽海螺材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the reaction process is simple, the use of mercaptoethanol as a chain transfer agent has an unpleasant pungent odor

Method used

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  • Polycarboxylate water reducing agent by using water as solvent and preparation method thereof
  • Polycarboxylate water reducing agent by using water as solvent and preparation method thereof
  • Polycarboxylate water reducing agent by using water as solvent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 19.61 g of maleic anhydride, 100 g of allyl polyglycol ether with a molecular weight of 2000 and 5.76 g of allyl sodium sulfonate into a four-necked flask, and add deionized water to dissolve. Heat up to 75°C, add dropwise the monomer solution prepared by 100g of allyl polyglycol ether with a molecular weight of 2000, 17.22g of methacrylic acid, 14.2g of acrylamide and deionized water, and 3g of ammonium persulfate The initiator solution prepared with deionized water was added dropwise in 3 hours. After 2 hours of heat preservation, the temperature was lowered to 30°C, and neutralized with 30% sodium hydroxide solution to Ph=7.0 to obtain the polycarboxylate superplasticizer PC -1.

Embodiment 2

[0031] Add 19.61 g of maleic anhydride, 100 g of allyl polyglycol ether with a molecular weight of 2000 and 14.4 g of allyl sodium sulfonate into a four-necked flask, and add deionized water to dissolve. Heat up to 85°C, add dropwise the monomers prepared from 100g of allyl polyglycol ether with a molecular weight of 2000, 14.4g of acrylic acid, 20.07g of 2-acrylamido-2-methylpropanesulfonic acid and deionized water solution, and the initiator solution prepared by 5g ammonium persulfate and deionized water, the dropwise addition was completed in 3 hours, and after 2 hours of heat preservation, the temperature was lowered to 30°C, and neutralized to Ph=7.0 with 40% sodium hydroxide solution to obtain Polycarboxylate superplasticizer PC-2.

Embodiment 3

[0033] Add 19.61 g of maleic anhydride, 120 g of allyl polyglycol ether with a molecular weight of 2400 and 12.6 g of sodium methacrylic sulfonate into a four-necked flask, and add deionized water to dissolve. Heat up to 70°C, add dropwise the monomer solution prepared by 120g of allyl polyglycol ether with a molecular weight of 2400, 17.29g of acrylic acid, 5.68g of acrylamide and deionized water, and 8g of ammonium persulfate and deionized water. The initiator solution prepared with ionized water was added dropwise in 2 hours. After 2 hours of heat preservation, the temperature was lowered to 30°C, and neutralized with 40% sodium hydroxide solution to Ph=7.0 to obtain the polycarboxylate water reducer PC-3 .

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Abstract

The invention belongs to the technical fields of building materials and chemical synthesis, and particularly relates to a polycarboxylate water reducing agent prepared by a one-step method and a preparation process thereof. The efficient polycarboxylate water reducing agent is obtained by directly dripping monomers a, b, c, d and e and performing polymerization reaction on initiator solution. Thewater reducing agent can be widely applied in various concrete projects, and has the advantages of high water reducing rate, good slump holding performance and the like. The method is simple, environmentally-friendly and easy to control, and has good social and economic benefits.

Description

Technical field: [0001] The invention belongs to the technical field of building material additives and chemical synthesis, and specifically relates to a polycarboxylate water reducer prepared by a one-step method and a preparation process thereof. Background technique: [0002] Water reducer is the largest and most widely used admixture in concrete engineering, and its amount accounts for more than 80% of the total amount of admixture. Polycarboxylate superplasticizer has gradually been widely recognized by the concrete industry because of its advantages such as small dosage, high water reducing rate, and good slump retention performance. Especially since 2005, with the introduction of railway regulations on admixtures for highways and passenger dedicated lines, polycarboxylate water reducers have been used in this field, and its annual usage has reached 500,000 tons. At present, polycarboxylate superplasticizers are also being used in other basic construction concrete pro...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F222/06C08F220/06C08F216/14C08F220/54C08F228/02C04B103/30
CPCC04B24/2641
Inventor 严生赵洪义冯恩娟
Owner 安徽海螺材料科技股份有限公司
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