Ultra-high-performance water reducing agent and preparation method thereof

An ultra-high-performance, water-reducing agent technology, applied in the field of concrete admixtures, can solve the problems of rapid concrete slump loss, poor workability of fresh concrete, high concrete viscosity, etc., to increase the steric hindrance effect, reduce viscosity, The effect of improving the water reduction rate

Active Publication Date: 2020-12-01
国检测试控股集团北京有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There is a common problem in the above-mentioned water reducing agents: in the case of low water-binder ratio, the viscosity of freshly mixed concrete is high, and the loss of concrete slump is fast, resulting in poor workability of freshly mixed concrete. In order to solve this technical problem, it is often necessary to Take additional technical measures, such as adjusting the type and proportion of mineral admixtures such as fly ash, adding viscosity regulators, etc.

Method used

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  • Ultra-high-performance water reducing agent and preparation method thereof
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  • Ultra-high-performance water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An ultra-high performance water reducing agent is prepared by the following method:

[0035] (1) 29.05g of propylene oxide and 70.4g of ethylene oxide were added to the reaction vessel, mixed uniformly, and fed with nitrogen; 2 The temperature was raised to 80 °C under a protective atmosphere, and 0.22 g of potassium hydroxide catalyst and 2.26 g of cuprous chloride polymerization inhibitor were added. 2 The temperature was raised to 120°C under a protective atmosphere, the reaction was continued for 3 h, cooled to room temperature, the product was extracted with ethyl acetate, washed 10 times with water, filtered, dried, and the solvent was removed to obtain side chain I.

[0036] (2) 18g of ethylene oxide, 2g of initiator aziridine, 25g of diethanolamino carboxylic acid were mixed in N 2 Under a protective atmosphere, react at 90 °C for 4 h to prepare a polydiethanolaminocarboxylic acid-ethylene oxide adduct, add 20 g L-aspartic acid, and add 20 g of L-aspartic acid ...

Embodiment 2

[0039] An ultra-high performance water reducing agent is prepared by the following method:

[0040] (1) 34.86g of propylene oxide and 74.8g of ethylene oxide were added to the reaction vessel, mixed uniformly, and nitrogen was introduced into the reaction vessel. 2 The temperature was raised to 85°C under a protective atmosphere, and 0.37g of sodium hydroxide catalyst and 2.46g of cuprous chloride polymerization inhibitor were added. 2 The temperature was raised to 100°C under a protective atmosphere, and after continuing the reaction for 2 h, the product was cooled to room temperature, the product was extracted with ethyl acetate, washed with water 12 times, filtered, dried, and the solvent was removed to obtain side chain I.

[0041] (2) by 22g ethylene oxide, 4g initiator aziridine, 10g diethanolamino carboxylic acid in N 2 Under a protective atmosphere, react at 100 °C for 4 h to prepare polydiethanolaminocarboxylic acid-ethylene oxide adduct, add 25 g of L-aspartic acid, a...

Embodiment 3

[0044] An ultra-high performance water reducing agent is prepared by the following method:

[0045] (1) 40.67g of propylene oxide and 79.2g of ethylene oxide were added to the reaction vessel, mixed uniformly, and nitrogen was introduced into the reaction vessel. 2 The temperature was raised to 90 °C under a protective atmosphere, and 0.53 g of potassium oxide catalyst and 3.99 g of cuprous chloride polymerization inhibitor were added. 2 The temperature was raised to 110°C under a protective atmosphere, and the reaction was continued for 4 hours, then cooled to room temperature. The product was extracted with ethyl acetate, washed with water for 10 times, filtered, dried, and the solvent was removed to obtain side chain I.

[0046] (2) 19g ethylene oxide, 3g initiator aziridine, 20g diethanolamino carboxylic acid were mixed in N 2 Under a protective atmosphere, react at 95 °C for 4 h to prepare polydiethanolaminocarboxylic acid-ethylene oxide adduct, add 20 g L-aspartic acid,...

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Abstract

The invention discloses an ultra-high-performance water reducing agent and a preparation method thereof. The preparation method comprises the following steps: carrying out a polymerization reaction onraw materials including epoxypropane/epoxybutane, ethylene oxide and L-aspartic acid to synthesize a side chain I; carrying out a polymerization reaction on raw materials including diethanol amino carboxylic acid, ethylene oxide and L-aspartic acid to synthesize a side chain II; finally, subjecting the side chain I, the side chain II and L-aspartic acid serving as raw materials to a graft polymerization reaction to obtain the ultra-high-performance water reducing agent. According to the invention, polyaspartic acid with good biodegradability is used as a main chain of the water reducing agent, and hyperbranched side chains with special molecular structures are prepared through molecular structure design and synthesis process design, so the green ultra-high-performance water reducing agentis obtained.

Description

technical field [0001] The invention relates to an ultra-high performance water reducer and a preparation method thereof, belonging to the technical field of concrete admixtures. Background technique [0002] Water reducing agent is an indispensable component in the preparation of concrete, and its water reducing rate and the consistency of concrete mixture directly affect the performance of concrete. At present, water-reducing agents for concrete can be divided into three categories. One is ordinary water-reducing agents. The water-reducing rate is generally 8% to 15%. There are mainly lignosulfonate water-reducing agents, which can be divided into the first generation. Water reducing agent; one type is high-efficiency water-reducing agent, the water-reducing rate is generally 15% to 25%, mainly naphthalene-based high-efficiency water-reducing agent and sulfamate high-efficiency water-reducing agent, which can be divided into the second generation of water-reducing agent T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08G65/26C08G65/28C04B24/24C04B103/30
CPCC08G73/10C08G73/1003C04B24/28C08G65/2624C04B2103/302
Inventor 许文英白杰王博秦宪明蔡阳赵佳张嫚陈敏王灵秀海晨晨张少霞
Owner 国检测试控股集团北京有限公司
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