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Polyether amine modified poly carboxylic acid superplasticizer and preparation method thereof

A superplasticizer and polycarboxylic acid technology, applied in the field of concrete admixtures, can solve problems such as harsh conditions and difficult control

Active Publication Date: 2012-07-04
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 poly carboxylic acid superplasticizer and preparation method thereof
  • Polyether amine modified poly carboxylic acid superplasticizer and preparation method thereof
  • Polyether amine modified poly carboxylic acid superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Add 700.0g of water, 700.0g of A-1, 100.0g of B-2 and 20.0g of ammonium persulfate into a 2000ml four-necked flask equipped with a stirrer, a thermometer and a dropping device, and stir to raise the temperature to 50°C. At the same time, add 100.0g reducing agent aqueous solution (obtained by dissolving 10.0g L-ascorbic acid and 10.0g 3-mercaptopropionic acid in 80.0g water) and 380.0g monomer aqueous solution (obtained by dissolving 200.0g B-1 in 180.0g water) respectively. ), the dropping time was controlled at 240 minutes and 210 minutes respectively, and the reaction temperature was controlled at 50-55°C. After the dropwise addition, keep the temperature at 50-55°C for about 60 minutes to complete the polymerization reaction to obtain a carboxylic acid-based polymer, which is designated as PAE-1, and its weight-average molecular weight is 13,800 by GPC.

[0067] Add 200.0g of carboxylic acid-based polymer PAE-1 and 156.4g of C-1 into a 1000ml four-neck flask equippe...

Embodiment 2

[0069] Add 450.0 g of water and 450.0 g of A-2 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, 100.0g aqueous initiator solution (obtained by dissolving 20.0g ammonium persulfate in 80.0g water), 100.0g aqueous solution of chain transfer agent (obtained by dissolving 15.0g 3-mercaptopropionic acid in 85.0g water) and 900.0g mono Body aqueous solution (obtained by dissolving 500.0g B-1 and 50.0g B-3 in 350.0g water), the dropping time was controlled at 240 minutes, 210 minutes and 210 minutes respectively, and the reaction temperature was controlled at 78-82°C. After the dropwise addition, keep the temperature at 78-82°C for about 60 minutes to complete the polymerization reaction to obtain a carboxylic acid-based polymer, which is denoted as PAE-2, and its weight-average molecular weight is 8700 by GPC test.

[0070] Add 200.0g of carboxylic acid-based polymer PAE-2 and...

Embodiment 3

[0072] Add 690.0g of water, 800.0g of A-3 and 10.0g of 35% hydrogen peroxide into a 2000ml four-necked flask equipped with a stirrer, a thermometer and a dropping device, and stir to raise the temperature to 60°C. At the same time, 100.0g reducing agent aqueous solution (obtained by dissolving 5.0g L-ascorbic acid and 10.0g thioglycolic acid in 85.0g water) and 400.0g monomer aqueous solution (obtained by dissolving 200.0g B-1 in 200.0g water) were added dropwise, dropwise The adding time was controlled at 240 minutes and 210 minutes respectively, and the reaction temperature was controlled at 60-65°C. After the dropwise addition, keep the temperature at 60-65°C for about 60 minutes to complete the polymerization reaction to obtain a carboxylic acid-based polymer, which is designated as PAE-3, and its weight-average molecular weight is 18,000 as measured by GPC.

[0073] Add 200.0g of carboxylic acid-based polymer PAE-3 and 36.2g of C-2 into a 1000ml four-neck flask equipped w...

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Abstract

The invention discloses a polyether amine modified poly carboxylic acid superplasticizer and a preparation method of the superplasticizer. The dispersant is a poly carboxylic acid copolymer with weight-average molecular weight of 10,000-120,000, which contains structural unit I originated from polyether, structural unit II originated from carboxyl and structural unit III originated from acylaminopolyether. The preparation method comprises the following steps: adding unsaturated polyether monomer A and unsaturated carboxylic acid monomers into a 50-100 DEG C water solution and carrying out a copolymerization reaction at the presence of a initiator and a chain transfer agent to obtain carboxyl polymer with molecular weight of 5,000-30,000; and allowing the carboxyl polymer and polyether amine monomers to carry out an amidation reaction at temperature of 80-200 DEG C to obtain the final product. The polyether amine modified poly carboxylic acid superplasticizer provided by the inventionstill has high concrete water-reducing rate, and keeps good concrete slump even under a low accretion condition.

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 polycarboxylic acid superplasticizer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer 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 the field of concrete admixture in the 21st century. research hotspots and development priorities. [0003] Patent CN 102101906 A reports a preparation method of an amide / imide type high-concentration polycarboxylic acid-based high-performance water reducer. In this patent, the first step is to acylate the unsaturated acid anhydride and monohydric alcohol amine to obtain the acylated product, and the second step is to catalyze the esterification of p...

Claims

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Application Information

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