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Method for synthesizing allyl polyether-type high-performance water reducing agent

A technology of allyl polyether and synthesis method, which is applied in the field of preparing high-performance concrete water-reducers, can solve the problems of complex preparation process, long production cycle, and high cost of polycarboxylate water-reducers, and achieve performance without being affected , easy operation, and the effect of improving polymerization activity

Inactive Publication Date: 2008-07-23
ZHEJIANG LAOHUSHAN BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of the polyether water reducer obtained by the synthesis method does not contain ester bonds, but contains ether bonds and functional groups such as carboxyl groups, amido groups, and sulfonic acid groups; effectively solves the problem of complex preparation process of polycarboxylate water reducers and high cost. Long production cycle and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]Add 16 parts of water to the reaction vessel equipped with stirring, condensation, and effluent reflux. When the temperature is at 40°C, add 1.5 parts of maleic anhydride, and add 0.3 parts of sodium hydroxide solution with a mass percentage concentration of 50%. Perform pre-neutralization. Dissolve 0.25 parts of acrylic acid, 0.05 parts of 2-acrylamide-2-methylpropanesulfonic acid, and 1 part of allyl polyethylene glycol ether (n=18) into 25 parts of water in sequence, and stir well to form a light yellow transparent Monomer mixed solution. Dissolve 0.063 parts of ammonium persulfate in 35 parts of water, raise the temperature to 70°C, and add the monomer mixed solution and initiator aqueous solution dropwise, respectively. The monomer mixed solution was added dropwise in 45 minutes, and the initiator aqueous solution was added dropwise in 60 minutes. Keep the blocking reaction at 70°C for 1 hour. Dissolve 0.027 parts of ammonium persulfate into 15 parts of water, st...

Embodiment 2

[0029] Add 13.4 parts of water to the reaction vessel equipped with stirring, condensation, and effluent reflux, add 2 parts of maleic anhydride at a temperature of 45°C, add 1 part of sodium hydroxide solution with a mass percentage concentration of 30%, and pre-neutralize the maleic anhydride. and processing. 1 part of allyl polyglycol ether (n=23) was added. Dissolve 0.15 parts of acrylic acid, 0.15 parts of acrylamide, and 0.05 parts of sodium (meth)allyl sulfonate into 22.3 parts of water, and stir evenly to obtain a transparent solution. Dissolve 0.147 parts of ammonium persulfate in 46.7 parts of water, raise the temperature to 80°C, and add the monomer solution and the aqueous initiator solution dropwise, respectively. The monomer mixed solution was added dropwise in 90 minutes, and the initiator aqueous solution was added dropwise in 90 minutes. Keep at 80°C to block the reaction for 2 hours. Dissolve 0.063 parts of ammonium persulfate into 20 parts of water, stir ...

Embodiment 3

[0031] Add 8.9 parts of water to the reaction vessel equipped with stirring, condensation, and effluent reflux. When the temperature is at 50°C, add 3.5 parts of maleic anhydride, and add 1.2 parts of sodium hydroxide solution with a mass percentage concentration of 50%. Anhydrides are pre-neutralized. Dissolve 0.5 parts of acrylic acid, 0.05 parts of 2-acrylamide-2-methylpropanesulfonic acid, and 1 part of allyl polyglycol ether (n=45) into 15.6 parts of water in sequence, and stir well to form a light yellow transparent Monomer mixed solution. Dissolve 0.13 parts of ammonium persulfate in 31.2 parts of water, raise the temperature to 85°C, and add the monomer mixed solution and initiator aqueous solution dropwise, respectively. The monomer mixed solution was added dropwise in 150 minutes, and the initiator aqueous solution was added dropwise in 180 minutes. Keep the blocking reaction at 85°C for 1 hour. Dissolve 0.06 parts of ammonium persulfate into 13.4 parts of water, ...

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Abstract

The invention relates to a synthetic method for an allyl polyether-type high efficiency water reducing agent, belonging to the field of water reducing agent. The synthetic method utilizes allyl polyoxyethylene ether monomer, maleic-anhydride, and a mixture with one or more of (methyl) sodium allylsulfonate, 2-acryl amide-2-methylpropanesulfonic acid, itaconic acid, acrylic acid and acrylamide for obtaining polyether-type high efficiency water reducing agent by initiating one-step polymerization through inorganic peroxides in water solution system, the final structure of the water reducing agent comprises no ester bond, carboxyl, amide, sulfonic group and other functional groups. The synthetic method for an allyl polyether-type high efficiency water reducing agent has the advantages of having applicability for various concrete constructions; having simple and easy process control and non-pollution; resolving the disadvantages of lower polymerization activity of allyl polyether monomer, and resolving the ubiquitous low temperature crystallization problem of allyl polyether-type high performance water reducing agent; and realizing obtaining higher dispersity and preserving degree in low-dosage, particularly, having good dispersion performance on the condition of extremely low water cement ratio.

Description

technical field [0001] The invention relates to the technical category of preparing a high-performance water reducer for concrete, in particular to a specific synthesis method of an allyl polyether type water reducer. Background technique [0002] In recent years, with the continuous increase of my country's investment in infrastructure construction, the development of the domestic construction industry is also changing with each passing day, and the demand for concrete superplasticizers is also increasing year by year. Faced with the real problem of high-efficiency superplasticizer foreign raw materials being expensive, the domestic raw material market has been established and is becoming more and more mature. Therefore, my country's construction industry urgently needs high-efficiency water reducer technology and products that adapt to the domestic market and high-performance concrete technology and fully realize the localization of raw materials. [0003] Most of the tra...

Claims

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Application Information

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IPC IPC(8): C08F290/06C04B24/32C04B103/30
Inventor 王子明王晓丰兰明章崔素萍王亚丽
Owner ZHEJIANG LAOHUSHAN BUILDING MATERIALS
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