Superplasticiser for cement granule dispersion and its synthesis method

A technology of superplasticizers and granules, which is applied in the field of dispersants for cement granules, and can solve the problems of easy environmental pollution, long reaction time, and high energy consumption.

Inactive Publication Date: 2006-04-05
SHANGHAI SUNRISE CHEMISTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process requires a long reaction time and consumes a large amount of valuable energy, making the cost of the final product very high
[0008] In U.S. Patent No. 5,432,212, a kind of methoxypolyethylene glycol monoallyl ester and maleic anhydride and cross-linking agent polyoxyethylene have been disclosed as a solvent under the condition that benzoyl peroxide is used as a catalyst. Diallyl ester was reacted at 90°C for 7 hours, and the solvent was removed to obtain a brown copolymer that was solid at room temperature. This water reducer has excellent performance in preventing slump loss, but this process is easy to cause environmental pollution. Pollution and high energy consumption during production

Method used

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  • Superplasticiser for cement granule dispersion and its synthesis method
  • Superplasticiser for cement granule dispersion and its synthesis method
  • Superplasticiser for cement granule dispersion and its synthesis method

Examples

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preparation example Construction

[0026] The monomer a used in the preparation of the copolymer of the present invention will be described below, wherein EO stands for ethylene oxide and PO stands for propylene oxide.

[0027] AE-1: Monoallyl ether of EO adduct (average molecular weight of added EO is 950)

[0028] AE-2: Monoallyl ether of adduct of EO (average molecular weight of added EO is 1200)

[0029] AE-3: Monoallyl ether of EO and PO block adduct (the average molecular weight of added EO is 400, and the average molecular weight of PO is 1500)

[0030] AE-4: Monoallyl ether of EO and PO block adducts (the average molecular weight of added EO is 750, and the average molecular weight of PO is 750)

[0031] AE-5: Monoallyl alcohol ether of adduct of EO (average molecular weight of added EO is 2288)

[0032] AE-6: Monoallyl alcohol ether of the adduct of methanol and EO (the average molecular weight of the added EO is 2288)

[0033] AE-7: Monoallyl alcohol ether of EO and PO block adduct (the average molecular ...

Embodiment 1

[0036] Add 81.5 parts of AE-1 into a 500ml four-necked flask equipped with a stirrer, thermometer and dripping device, while adding 75 parts of deionized water. After stirring and dissolving, add 0.008 parts of ferrous sulfate heptahydrate and 1.5 parts of 30% Of hydrogen peroxide. At 30℃, simultaneously add maleic anhydride solution (8.9 parts of maleic anhydride dissolved in 45 parts of deionized water, after stirring to dissolve, add 0.018 parts of ferrous sulfate heptahydrate and 3.125 parts of 30% hydrogen peroxide) and formaldehyde Sodium sulfite solution (1.81 parts of sodium formaldehyde hyposulfite dissolved in 10 grams of deionized water), the dripping time is controlled at 70 minutes, and the reaction temperature is not higher than 38°C. After the dripping is completed, keep it at 35°C for 30 min, and neutralize it with 25% NaOH to a pH of 6.22.

Embodiment 2

[0038] Add 81.5 parts of AE-2 into a 500ml four-necked flask equipped with a stirrer, thermometer and dripping device, while adding 75 parts of deionized water. After stirring and dissolving, add 0.008 parts of ferrous sulfate heptahydrate and 1.5 parts of 30% Of hydrogen peroxide. At 30℃, simultaneously add maleic anhydride solution (8.9 parts of maleic anhydride dissolved in 45 parts of deionized water, after stirring to dissolve, add 0.018 parts of ferrous sulfate heptahydrate and 3.125 parts of 30% hydrogen peroxide) and formaldehyde Sodium sulfite solution (1.81 parts of sodium formaldehyde hyposulfite dissolved in 10 grams of deionized water), the dripping time is controlled at 70 minutes, and the reaction temperature is not higher than 38°C. After the dripping is completed, keep it at 35°C for 30 min, and neutralize it with 25% NaOH to a pH of 6.22.

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Abstract

The invention discloses a superplasticisers to disperse cement particle, which is prepared with polyalkenylethers and derivative of unsaturated carboxylic acid by initiator of oxido-reduction system. Wherein, there is a ether bond between main and branch chain. The product has better hot stability on high pH value and application process. This invention has wide raw material, low cost, simple technique, and no pollution to environment.

Description

Technical field [0001] The invention relates to a cement particle dispersant and a method for synthesizing the same. Specifically, it is prepared by copolymerizing an allyl alcohol polyether and an unsaturated dicarboxylic acid derivative under a redox system to disperse cement particles. Agent. Background technique [0002] Concrete is a widely used material in bridges, roads, construction and other projects. With the rapid development of the construction industry and water conservancy projects, the performance and dosage of concrete are constantly improving. This is accompanied by an increase in the amount of admixtures used to improve the performance of concrete, among which water-reducing admixtures are the largest amount of admixtures in concrete. [0003] High-performance water-reducing agent is a key material for obtaining high-performance concrete. In addition to having a higher water-reducing effect, it is also required to control the slump loss of concrete and better so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/42C04B24/28C04B24/32
Inventor 郑柏存沈军傅乐峰冯中军
Owner SHANGHAI SUNRISE CHEMISTRY CO LTD
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