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Polyether-based polycarboxylic acid series hyper-dispersant and synthetizing method

A technology of polyether-based polycarboxylic acid and hyperdispersant, which is applied in the field of cement concrete hyperdispersant and its synthesis, polyether-based polycarboxylic acid hyperdispersant and its synthesis, and can solve the problem of large slump loss and environmental problems. Pollution, few practical applications, etc.

Inactive Publication Date: 2009-09-16
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the 1960s to the early 1980s, it was the development stage of high-efficiency water reducers. At this stage, the water reducers were mainly represented by naphthalene series. The water rate is higher, but the concrete slump loss is faster, and it needs to be compounded to meet different construction requirements, but the water reducing agent after compounding has an impact on the development of the early strength of concrete
In addition, this product uses a large amount of formaldehyde and concentrated sulfuric acid to synthesize, which seriously pollutes the environment during the production process.
[0005] The performance of melamine series water reducer is slightly better than that of naphthalene series, but the price of this product is high, it is difficult to store, the loss of slump is large, the concrete is viscous, and its practical application is seldom
The product has excellent performance but the process is complex and causes great pollution to the environment
Due to the long production cycle, the production cost is high

Method used

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  • Polyether-based polycarboxylic acid series hyper-dispersant and synthetizing method
  • Polyether-based polycarboxylic acid series hyper-dispersant and synthetizing method
  • Polyether-based polycarboxylic acid series hyper-dispersant and synthetizing method

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preparation example Construction

[0030] The monomer A used in the preparation process of the copolymer of the present invention will be described below, wherein stands for polyoxyethylene, Represents a polyoxypropylene group.

[0031] A-1: Allyl polyglycol ether (added The average molecular weight of 400);

[0032] A-2: Allyl polyglycol ether (added The average molecular weight of 1000);

[0033] A-3: Allyl polyglycol ether (added The average molecular weight of 1300);

[0034] A-4: Allyl polyglycol ether (added The average molecular weight of 2000);

[0035] A-5: Allyl polyglycol ether (added The average molecular weight of 2400);

[0036] A-6: Allyl polyglycol ether (added The average molecular weight of 5000);

[0037] A-7: Allyl polyglycol ether (added The average molecular weight of 2000, The average molecular weight of 400);

[0038] A-8: Allyl polyglycol ether (added The average molecular weight of 1000, The average molecular weight of 1400);

[0039] Monomer B used in the ...

Embodiment 1

[0041] Add 25.4gA-1 and 63.5gA-2 into a 500ml four-neck flask equipped with devices such as stirring, temperature controller, and raw material dropping, and add 100g of deionized water at the same time, stir and dissolve while heating, and raise the temperature to 55±2°C. After the monomer A is dissolved, add 0.005g of ferrous sulfate and 0.3g of 35% hydrogen peroxide. At 55±2°C, add acrylic acid solution (20g acrylic acid dissolved in 5g water) and sodium ascorbate solution (0.4g sodium ascorbate dissolved in 30g deionized water) dropwise at the same time, the dropping time is controlled at 4 hours, and the reaction temperature remains unchanged . After the dropwise addition, continue to keep warm for 30 minutes, then cool to below 40°C, add sodium hydroxide to neutralize to pH=6.8, add water to dilute to 40%, and obtain a colorless transparent solution. After testing, the average molecular weight is 48000, and the density is 1.06g / ml.

Embodiment 2

[0043]Add 35.3gA-2 and 53.5gA-4 into a 500ml four-neck flask equipped with devices such as stirring, temperature controller, and raw material dropping, and add 100g of deionized water at the same time, stir and dissolve while heating, and raise the temperature to 60±2°C. After the monomer A is dissolved, add 0.006g of ferrous sulfate and 0.3g of 35% hydrogen peroxide. At 60±2°C, add acrylic acid solution (20g acrylic acid dissolved in 5g water) and sodium ascorbate solution (0.4g sodium ascorbate dissolved in 30g deionized water) dropwise at the same time, the dropping time is controlled at 4 hours, and the reaction temperature remains unchanged . After the dropwise addition, continue to keep warm for 30 minutes, then cool to below 40°C, add sodium hydroxide to neutralize to pH=6.8, add water to dilute to 40%, and obtain a colorless transparent solution. After testing, the average molecular weight is 45000, and the density is 1.06g / ml.

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Abstract

The invention provides a polyether-based polycarboxylic acid series hyper-dispersant which is prepared by copolymerization of polyethlene glycol and unsaturated carboxylic acid or the ramification under the action of redox system catalyst, and a synthesizing method which belongs to the water reducing agent field. The method uses the new type redox catalyst, synthesizes a polyether-based hyper-dispersant with high efficiency. The method has simple processing technique, conquers difficult operation caused by low reaction temperature and energy waste caused by high temperature. The hyper-dispersant and the synthesizing method have advantages of environmental-friendly, low energy consumption and low cost.

Description

technical field [0001] The invention relates to a cement concrete hyperdispersant and its synthesis method, in particular, it is prepared by copolymerizing allyl polyethylene glycol and unsaturated carboxylic acid or its derivatives under the action of redox system catalyst. The invention discloses a polyether-based polycarboxylic acid hyperdispersant and a synthesis method thereof, belonging to the field of concrete admixtures. Background technique [0002] Cement concrete hyperdispersant, also known as high-efficiency water reducer, is an indispensable building material product in the process of engineering construction, and is called the fifth component of concrete. The development of cement concrete dispersants has a long history and has gone through several stages: [0003] In 1935, American E.W. Scripture first developed lignosulfonate superplasticizer. The water reducing rate of this series of water reducing agents is relatively low, but they are still used because ...

Claims

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Application Information

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IPC IPC(8): B01F17/44C09K23/44
CPCC04B24/32C04B2103/408
Inventor 马临涛王少江鲁一晖陈改新纪国晋刘晨霞
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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