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Method for synthesizing polycarboxylic acid high-property water reducer by copolymerization of amidated active monomers

A technology of amidation reaction and copolymerization reaction, which is applied in the field of polycarboxylate high-performance water reducer, can solve the problems of poor dispersion retention, reduce the dependence on preparation methods, reduce production costs, and increase market competitiveness.

Inactive Publication Date: 2011-09-14
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also adjusts the distribution of carboxyl groups on the main chain and the number of ethylene oxide repeating units on the side chain during the synthesis process, which effectively improves the problem of poor dispersion retention generally existing in traditional polycarboxylate superplasticizers. The preparation method of synthetic polycarboxylate high-performance water reducer

Method used

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  • Method for synthesizing polycarboxylic acid high-property water reducer by copolymerization of amidated active monomers
  • Method for synthesizing polycarboxylic acid high-property water reducer by copolymerization of amidated active monomers
  • Method for synthesizing polycarboxylic acid high-property water reducer by copolymerization of amidated active monomers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]120g of amino-terminated polyoxyethylene ether (molecular weight: 2000) was added into the reactor, and when the temperature was raised to 50°C, 0.26g of hydroquinone methyl ether, 12.96g of acrylic acid, 1.84g of concentrated sulfuric acid (concentration of 98 %), and the stirring time of each feeding interval was 10 minutes, when the temperature was raised to 80°C, 26.59g hexanaphthene was added, and the temperature was continued to be raised to 145°C to carry out the amidation reaction, and the reaction obtained water was separated during the reaction, and the reaction 6 After one hour, the cyclohexane was removed by vacuuming to obtain the acryloyl polyoxyethylene ether amine, the product of the amidation reaction; , heat up to 60°C and stir for 20 minutes until it is evenly mixed, then add 6.48g of acrylic acid, 2.76g of mercaptoacetic acid, and 92.24g of potassium persulfate solution with a mass fraction of 15% to the reactor, and stir for 10 minutes between each fe...

Embodiment 2

[0024] The polycarboxylate superplasticizer with a concentration of 45% obtained in Example 1 was stored at 6° C. for 40 days, and its implementation effect was measured.

Embodiment 3

[0026] 180g amino-terminated polyoxyethylene ether (molecular weight is 3000) is added in the reactor, when heating up to 80 ℃, add 0.39g hydroquinone, 7.74g methacrylic acid, 9g phosphoric acid successively in the reactor, and each time Stirring time between additions is 20 minutes. When the temperature rises to 100°C, add 15.02g of toluene, and continue to heat up to 160°C for amidation reaction. During the reaction, the water obtained from the reaction is separated, and the toluene is removed by vacuuming after 2 hours of reaction. , to obtain the amidation reaction product isoacryloyl polyoxyethylene ether amine; add the product isoacryloyl polyoxyethylene ether amine obtained from the above amidation reaction into the reactor, then add 201.51g of water, heat up to 50°C and stir for 30 minutes Treat that it is mixed evenly, add the mixture of 12.9g methacrylic acid and 1.95g itaconic acid, 0.64g mercaptopropionic acid, 6.72g mass fraction to the reactor successively and be ...

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Abstract

The invention discloses a method for synthesizing polycarboxylic acid high-property water reducer by copolymerization of amidated active monomers, belonging to the field of water reducer. In the invention, the polycarboxylic acid high-property water reducer material is prepared by a method of first amidation and second copolymerization, namely, taking a (methyl) acrylic monomer and methoxyl polyoxyethylene ether with the other end containing amino as reactant, preparing a polymerizable monomer by amidation reaction under the action of catalyst, then copolymerizing the polymerizable monomer with the (methyl) acrylic monomer and a chain transfer monomer in water solution under the action of initiator, and then neutralizing with alkaline solution, thus preparing the polycarboxylic acid high-property water reducer. The method is low in cost, environment-friendly and free from pollution and achieves high polymerization degree and strong controllability; by copolymerization of amidated active monomer, an amide structure is introduced into the molecular structure of polycarboxylic acid water reducer, cement can obtain good flowing property, the flowing capacity maintaining capability of neat cement paste is improved obviously, excellent cement adaptivity is shown, and excellent flowing effect can be obtained under low doping quantity and low water-ash ratio.

Description

technical field [0001] The invention relates to the technical field of a polycarboxylate high-performance water reducer for cement concrete, in particular to a specific preparation method for synthesizing a polycarboxylate high-performance water reducer by copolymerization reaction of amidated active monomers. Background technique [0002] As countries in recent years continue to attach importance to and increase the intensity of scientific and technological innovation, my country's economic strength and infrastructure construction are also growing at the same time, and the domestic construction industry is undergoing rapid changes. Buildings with excellent strength and durability and high construction quality A large number of water reducers have emerged, and the performance requirements for concrete high-performance water reducers have been continuously improved, and the demand has also increased year by year, showing a sharp growth trend in recent years. [0003] Facing th...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08G65/00C04B24/26C04B103/30
Inventor 刘晓王子明崔素萍兰明章毛倩瑾王亚丽
Owner BEIJING UNIV OF TECH
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