Polycarboxylic acid water reducing agent

A technology of water reducing agent and polycarboxylic acid, applied in the field of polycarboxylic acid water reducing agent, can solve problems such as poor slump retention performance

Active Publication Date: 2013-04-10
北京慕湖新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invented polycarboxylate cement dispersant has a high water reducing rate and can also improve the early strength of concrete, but the inventive polycarboxylate cement dispersant has poor slump retention performance

Method used

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  • Polycarboxylic acid water reducing agent
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  • Polycarboxylic acid water reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 25.0g of A-1, 60.0g of water, and 5.0g of 30% hydrogen peroxide into a 500ml four-necked flask equipped with a stirrer, a thermometer and a dropping device, and stir to raise the temperature to 65°C. At the same time, 21.6g vitamin C aqueous solution (obtained by dissolving 0.4g vitamin C, 1.2g 3-mercaptopropionic acid in 20.0g water) and 159.0g monomer aqueous solution (obtained by 50.0g B-1, 10.0g C-1, 21.0 gD-1 mixed with 78.0 g of water), the dropping time was controlled at 210 minutes and 180 minutes respectively, and the reaction temperature was controlled at 63-67°C. After the dropwise addition, keep the temperature at 63-67°C for 30 minutes to complete the polymerization reaction. After the heat preservation is completed, lower the temperature to below 50°C and add 44.4g of 30% NaOH aqueous solution to obtain the polycarboxylate superplasticizer PC-1 of the present invention, which has a solid content of 42.5% and a weight average molecular weight of 107,500...

Embodiment 2

[0038] Add 10.0 g of A-2, 50.0 g of water, and 5.0 g of 30% hydrogen peroxide into a 500 ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 65°C. At the same time, 22.1g vitamin C aqueous solution (obtained by dissolving 0.6g vitamin C, 1.5g 3-mercaptopropionic acid in 20.0g water) and 146.0g monomer aqueous solution (obtained by 65.0g B-1, 1.0g C-1, 30.0g D -1 dissolved in 50.0 g of water), the dropping time was controlled at 210 minutes and 180 minutes respectively, and the reaction temperature was controlled at 63-67°C. After the dropwise addition, keep the temperature at 63-67°C for 30 minutes to complete the polymerization reaction. After the heat preservation is completed, lower the temperature to below 50° C. and add 37.0 g of 30% NaOH aqueous solution to obtain the polycarboxylate superplasticizer PC-2 of the present invention, which has a solid content of 45.6% and a weight average molecular weight ...

Embodiment 3

[0040] Add 25.0 g of A-3, 50.0 g of water, and 5.0 g of 30% hydrogen peroxide into a 500 ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 65°C. At the same time, 22.1g of vitamin C aqueous solution (obtained by dissolving 0.6g of vitamin C and 1.5g of 2-mercaptopropionic acid in 20.0g of water) and 200.0g of monomer aqueous solution (from 50.0g of B-2 and 10.0g of C-2, 21.0 g D-2 was dissolved in 78.0 g of water), the dropping time was controlled at 180 minutes and 150 minutes respectively, and the reaction temperature was controlled at 63-67°C. After the dropwise addition, keep the temperature at 63-67°C for 30 minutes to complete the polymerization reaction. After the heat preservation is completed, lower the temperature to below 50°C and add 42.0 g of 30% sodium hydroxide aqueous solution to obtain the polycarboxylate water reducer PC-3 of the present invention, which has a solid content of 48.8% and a ...

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Abstract

The invention discloses a polycarboxylic acid water reducing agent which is prepared by copolymerizing 10-25 wt% of monomer A, 50-65 wt% of monomer B, 1-10 wt% of monomer C and 21-30 wt% of monomer D in a 50-100 DEG C water solution in the presence of an initiator and a chain-transfer agent, wherein the sum of the weight percents of the monomers A, B, C and D is 100%; the monomer A is unsaturated polyether; the monomer B is unsaturated acid, unsaturated acid anhydride or mixture thereof; the monomer C is unsaturated siloxane; and the monomer D is a unsaturated monomer with double bond, excluding the monomers A, B and C. When being used in mortar or concrete, the water reducing agent has the advantages of high water reducing rate, high slump holding capacity and low gas content.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and relates to a water reducer for mortar or concrete, in particular to a polycarboxylate water reducer. Background technique [0002] Water reducer is an essential chemical admixture to improve slag-based cementitious materials and concrete products. It can significantly improve the workability, compactness, strength and durability of products at a low water-cement ratio. comprehensive performance. Polycarboxylate water reducer is the third generation water reducer product, it can not only greatly improve the comprehensive performance of slag-based cementitious materials and concrete, but also has the characteristics of low dosage, green environmental protection, large degree of freedom of molecular structure, etc. The application prospect is extremely broad. At present, the research on polycarboxylate water reducers at home and abroad mainly focuses on the following aspects: (1) r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/40C04B103/30
Inventor 马清沛
Owner 北京慕湖新材料技术有限公司
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