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Low molecular weight polyether water reducing agent, its preparation method and application

A low-molecular-weight polyether and polyether technology, applied in the field of low-molecular-weight polyether and its preparation, can solve the problems of weakening the adsorption of polycarboxylate water-reducers, reducing the working performance of polycarboxylate water-reducers, and reducing slump The effect of degree loss

Active Publication Date: 2013-08-21
广东奥克化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the application of polycarboxylate superplasticizer, the competitive adsorption behavior of clay in inferior sand and gravel weakens the adsorption of cement to polycarboxylate superplasticizer and reduces the working performance of polycarboxylate superplasticizer

Method used

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  • Low molecular weight polyether water reducing agent, its preparation method and application
  • Low molecular weight polyether water reducing agent, its preparation method and application
  • Low molecular weight polyether water reducing agent, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Under negative pressure conditions, add 131 grams of methyl p-hydroxybenzoate and 2.9 grams of catalyst KOH in the autoclave, then carry out nitrogen replacement to the autoclave, start stirring, and the reactor material is heated, when the temperature is 80~100 At ℃, add 10 grams of alkyl ethylene oxide to initiate the polymerization reaction. After the temperature continues to rise and the pressure drops, a total of 1310 grams of alkyl ethylene oxide is continuously and stably added to the reactor. During continuous feeding, the polymerization reaction temperature is controlled at 120 ~ 130°C, after the continuous feeding, carry out the aging reaction at 120-130°C, when the pressure of the kettle no longer drops, start to cool down the reactor material, the temperature drops to 80-90°C, and neutralize it to pH 6 with glacial acetic acid ~7 discharges.

[0032] The samples obtained in the above steps were distilled under reduced pressure to remove low boiling substance...

Embodiment 2

[0034] Under negative pressure conditions, add 166 grams of ethyl p-hydroxybenzoate and 3.86 grams of catalyst KOH to the autoclave, then replace the autoclave with nitrogen, start stirring, and heat the materials in the autoclave. At 100°C, add 10 grams of alkyl ethylene oxide to initiate the polymerization reaction. After the temperature continues to rise and the pressure drops, continuously and stably add a total of 1750 grams of alkyl ethylene oxide to the reactor. During continuous feeding, the polymerization reaction temperature is controlled at 120 ~130°C, after the continuous feeding, carry out the aging reaction at 120~130°C, when the pressure of the kettle no longer drops, start to cool down the reactor material, the temperature drops to 80~90°C, and neutralize it to pH with glacial acetic acid 6~7 discharge.

[0035] The samples obtained in the above steps were distilled under reduced pressure to remove low boiling substances. Then all proceed to esterification uni...

Embodiment 3

[0037]Under negative pressure conditions, add 131 grams of methyl p-hydroxybenzoate and 2.9 grams of catalyst KOH in the autoclave, then replace the autoclave with nitrogen, start stirring, and heat the materials in the autoclave. At 100°C, add 10 grams of alkyl ethylene oxide to initiate the polymerization reaction. After the temperature continues to rise and the pressure drops, continuously and stably add a total of 1310 grams of alkyl ethylene oxide to the reactor. During continuous feeding, the polymerization reaction temperature is controlled at 120 ~130°C, after the continuous feeding, carry out the aging reaction at 120~130°C, when the pressure of the kettle no longer drops, add 10 grams of alkyl propylene oxide to initiate the polymerization reaction, after the temperature continues to rise and the pressure drops, continue Add a total of 48 grams of alkyl propylene oxide to the reactor stably. During the continuous feeding, control the polymerization reaction temperatur...

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Abstract

The invention discloses a low molecular weight polyether with a structure shown in formula (1) and its preparation method. In the formula, R1 and R2 are independently the alkyl of C1-C3 or H, R1 and R2 can be the same or different, m, n and p, q are integers from 0 to 100 respectively, m and n can be the same or different, p and q can be the same or different, and m and p, n and q are not 0 at the same time. According to the preparation method, firstly alkyloxyalkylene is employed to perform oxyalkylation on p-hydroxybenzoate, and then the obtained product and maleic anhydride undergo an esterification reaction, thus obtaining the low molecular weight water reducing agent. The low molecular weight water reducing agent can be directly used as a polycarboxylate water reducing agent, also can be compounded with other types of polycarboxylate water reducing agents, and also can be copolymerized with other alkene monomers to form high molecular weight polycarboxylate water reducing agents. The low molecular weight water reducing agent provided in the invention can reduce concrete slump loss, and weaken the adsorption of clay to a polycarboxylate water reducing agent.

Description

technical field [0001] The invention relates to a low-molecular-weight polyether and a preparation method thereof, more specifically, the invention relates to a low-molecular-weight polyether used in a water reducing agent and a preparation method thereof. Background technique [0002] At present, with the rapid development of the concrete industry, the corresponding research work on concrete superplasticizers is also constantly developing and progressing, especially the development of polycarboxylate superplasticizers, which is a hot research topic at home and abroad. During the application process of polycarboxylate superplasticizer, the competitive adsorption behavior of clay in inferior sand and gravel weakens the adsorption of cement to polycarboxylate superplasticizer and reduces the working performance of polycarboxylate superplasticizer. In order to solve this problem, many scholars have mentioned the method of using sacrificial agents, relying on sacrificial agents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/332C08G65/28C08F283/06C04B24/32C04B24/26C04B103/30
Inventor 朱建民刘兆斌董振鹏仲崇刚周立明范雷
Owner 广东奥克化学有限公司
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