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Polyether amine modified polycarboxylic water reducer and preparation method thereof

A technology of polycarboxylate and polyetheramine, applied in the field of concrete admixtures, can solve problems such as difficult control and harsh conditions, and achieve the effects of improving efficiency, high concrete water reduction rate and shortening reaction time.

Active Publication Date: 2012-06-27
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main branches in the molecular structure of the water reducer are connected by amide bonds, and the water reducing performance is excellent, but the conditions in the process of preparing polymerizable monomers by amidation reaction are harsh and difficult to control

Method used

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  • Polyether amine modified polycarboxylic water reducer and preparation method thereof
  • Polyether amine modified polycarboxylic water reducer and preparation method thereof
  • Polyether amine modified polycarboxylic water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Add 100.0 g of B-2, 50.0 g of itaconic acid and 780.0 g of water into a 2000 ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 80°C. At the same time, 200.0g of ammonium persulfate aqueous solution (obtained by dissolving 20.0g of ammonium persulfate in 180.0g of water), 20.0g of 3-mercaptopropionic acid and 850.0g of B-1 were added dropwise, and the dropping time was controlled at 180 minutes and 150 minutes respectively. And 150 minutes, the reaction temperature is controlled at 78~82 ℃. After the dropwise addition, keep the temperature at 78-82°C for about 60 minutes to complete the polymerization reaction to obtain a polycarboxylic acid copolymer, which is denoted as PC-1, and its weight-average molecular weight is 3800 by GPC test.

[0051] Add 200.0g of polycarboxylic acid copolymer PC-1 and 957.95g of A-1 into a 2000ml four-neck flask equipped with a stirrer, thermometer, condenser and vacuum ...

Embodiment 2

[0053] Add 200.0 g of itaconic acid and 775.0 g of water into a 2000 ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 95°C. At the same time, 200.0g of ammonium persulfate aqueous solution (obtained by dissolving 20.0g of ammonium persulfate in 180.0g of water), 25.0g of 3-mercaptopropionic acid and 850.0g of B-3 were added dropwise, and the dropping time was controlled at 210 minutes and 180 minutes respectively. And 180 minutes, the reaction temperature is controlled at 78~82 ℃. After the dropwise addition, keep the temperature at 78-82°C for about 60 minutes to complete the polymerization reaction to obtain a polycarboxylic acid copolymer, which is denoted as PC-2, and its weight-average molecular weight is 3100 by GPC test.

[0054] Add 200.0g of polycarboxylic acid copolymer PC-2 and 517.5g of A-2 into a 2000ml four-neck flask equipped with a stirrer, thermometer, condenser and vacuum receiving device...

Embodiment 3

[0056] Add 400.0 g of itaconic acid and 780.0 g of water into a 2000 ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 52°C. At the same time, 200.0g of sodium persulfate aqueous solution (obtained by dissolving 20.0g of sodium persulfate in 180.0g of water), 20.0g of 3-mercaptopropionic acid and 600.0g of B-1 were added dropwise, and the dropping time was controlled at 210 minutes and 180 minutes respectively. And 180 minutes, the reaction temperature is controlled at 50~54 ℃. After the dropwise addition, keep the temperature at 50-54°C for about 60 minutes to complete the polymerization reaction to obtain a polycarboxylic acid copolymer, which is denoted as PC-3, and its weight-average molecular weight is 3400 by GPC test.

[0057] Add 200.0g of polycarboxylic acid copolymer PC-3 and 544.9g of A-3 into a 2000ml four-neck flask equipped with a stirrer, thermometer, condenser and vacuum receiving device, gr...

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Abstract

The invention discloses a polyether amine modified polycarboxylic water reducer and a preparation method thereof. The water reducer is a polyether amine modified polycarboxylic acid copolymer which has the weight-average molecular weight of 5,000 to 120,000 and is obtained by performing amidation on polycarboxylic acid copolymer which has the weight-average molecular weight of 1,000 to 30,000 andcomprises 5.0 to 50.00 weight percent of carboxylic structural unit I and a carboxylic structural unit II, and a polyether amine monomer A at the temperature of between 80 and 200 DEG C; the preparation method comprises the following steps of: copolymerizing itaconic acid, and unsaturated carboxylic monomer B under the action of an initiator in a solution at the temperature of between 50 and 100 DEG C to obtain a polycarboxylic copolymer with the molecular weight of between 1,000 and 3,000; and performing amidation on the copolymer and the polyether amine monomer A at the temperature of between 80 and 200 DEG C. The polyether amine modified polycarboxylic water reducer is high in concrete water-reducing rate under the condition of low accretion, and keeps good concrete slump simultaneously.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and relates to a superplasticizer for mortar or concrete, in particular to a novel polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate high-performance water reducer is called the third-generation concrete superplasticizer, which has the advantages of low dosage, high water reducing rate, large degree of freedom in molecular structure design, and environmental friendliness. It has become a concrete admixture in the 21st century Research hotspots and development priorities in the field. [0003] In the patent CN101205127A, a formula of a polycarboxylic acid superplasticizer and its manufacturing method are disclosed. Firstly, polyethylene glycol monomethyl ether and maleic anhydride are esterified under the conditions of the presence of a catalyst and a polymerization inhibitor to form a large single body, and then copolymerize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08G81/02C08F220/06C08F222/06C08F222/02C08F220/28C08F220/56C04B103/30
Inventor 冯中军傅乐峰郑柏存
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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