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Method for preparing shrinkage reducing agent with water reducing performance

A technology of shrinkage reducing agent and performance, applied in the field of preparation of shrinkage reducing agent, can solve the problem of low water reducing rate, achieve good water reducing performance, good freeze-thaw resistance, and low carbonization speed

Active Publication Date: 2016-11-09
SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above shrinkage reducing agents all have the disadvantage of low water-reducing rate. If the shrinkage-reducing agent has good water-reducing and shrinkage-reducing performance at the same time, the dosage can be reduced to achieve good cost performance and market competitiveness.

Method used

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  • Method for preparing shrinkage reducing agent with water reducing performance
  • Method for preparing shrinkage reducing agent with water reducing performance
  • Method for preparing shrinkage reducing agent with water reducing performance

Examples

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preparation example Construction

[0023] The steps of the preparation method of the shrinkage reducing agent with water-reducing properties in the present invention are as follows:

[0024] Put a certain amount of dipropylene glycol monomethyl ether and catalyst into the reactor, heat up to 90-110°C, put in a certain amount of maleic anhydride, and keep it warm for 4-6 hours; then cool it down to 50-60°C and keep it warm. Add a certain amount of water and unsaturated polyoxyethylene ether monomer, stir until completely dissolved; then put a certain amount of oxidant into the reaction kettle, and stir evenly. Add material A made of unsaturated carboxylic acid and water and material B made of chain transfer agent, reducing agent and water; in the process of dropping, add trifluoroethyl methacrylate in batches, A The dropping time of material is 3-4 hours, and the dropping time of material B is 20-40 minutes longer than that of material A; continue to react for 1-2 hours, then cool down to 30--35°C, add to the al...

example 1

[0036] Put 0.51g of dipropylene glycol monomethyl ether and 0.2g of concentrated sulfuric acid into a 500mL four-necked bottle, heat the oil bath to 90°C, add 4.2g of maleic anhydride, turn on the magnetic stirring, and react for 5h; then cool down to 50°C and keep warm , add 84g of water and 89g of methallyl polyoxyethylene ether to it and stir until completely dissolved; then put 1.6g of 30% hydrogen peroxide into it and stir evenly. Then start to drop the A material made of 9.1g acrylic acid and 21g water and the B material made of 0.2g ascorbic acid, 0.32g mercaptoacetic acid, 0.08g ferrous ammonium sulfate and 30g water; Add 0.02g of trifluoroethyl methacrylate in half an hour, the dropping time of material A is 3-4 hours, and the dropping time of material B is 25 minutes longer than that of material A; continue to react for one and a half hours, add water Dilute to a solid content of 40%, and then neutralize with a 32wt% potassium hydroxide solution to a pH of 6-8 to obt...

example 2

[0038]Put 0.37g of dipropylene glycol monomethyl ether and 0.3g of p-toluenesulfonic acid into a 500L four-necked bottle, heat the oil bath to 95°C, put in 2.5g of maleic anhydride, turn on the magnetic stirring, and react for 4 hours; then cool down Keep warm at 55°C, add 84g of water and 89g of propylene polyoxyethylene ether into it and stir until completely dissolved; then add 3.3g of 30% hydrogen peroxide into it and stir evenly. Then start to drop A material made of 8.1g acrylic acid 3.2g methacrylic acid and 19g water and B material made of 0.05g Diabolite block, 0.31g mercaptopropionic acid, 0.08g mercaptoethanol and 30g water; During the addition process, add 0.17g of trifluoroethyl methacrylate every half hour, the dropping time of material A is 3-4 hours, and the dropping time of material B is 25 minutes longer than that of material A; continue React for one and a half hours, add water to dilute to a solid content of 40%, and add 32 wt% potassium hydroxide solution ...

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Abstract

The invention discloses a method for preparing a shrinkage reducing agent with water reducing performance and particularly relates to the technical field of methods for synthesizing concrete liquid admixtures. According to the method, the method for preparing the shrinkage reducing agent with water reducing performance is achieved on the basis of systematically studying free-radical polymerization principles and optimizing matched monomers. The shrinkage reducing agent is synthesized specifically through firstly, subjecting dipropylene glycol monomethyl ether and maleic anhydride to an esterification reaction in the presence of a catalyst, and then, subjecting an esterification reaction product to copolymerization with an unsaturated double-bond polyoxyethylene ether monomer, unsaturated carboxylic acid and trifluoroethyl methacrylate in an aqueous solution in a redox system. According to the method, concrete can have excellent fluidity, good early strength, relatively low shrinkage reducing percent and good freeze-thaw resistance.

Description

technical field [0001] The invention relates to the technical field of synthetic methods of concrete liquid admixtures, in particular to a preparation method of a shrinkage reducing agent with water-reducing properties. Background technique [0002] Concrete admixtures account for a small proportion in concrete, and most of them are organic substances. Its incorporation combines the principles of organic chemistry and inorganic chemistry to further improve the related properties of concrete according to engineering needs, such as workability and water reduction. Amount, change the mechanical properties of concrete, improve durability; admixtures can also improve the microstructure of concrete, improve the compactness of concrete, so through the study of these admixtures can expand the use of concrete, so that concrete can meet the needs of various construction projects. [0003] Concrete shrinkage reducing agent can solve a difficult problem in construction engineering - con...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F222/06C08F220/06C08F220/02C08F220/22C04B24/26C04B103/30
CPCC04B24/267C04B2103/302C08F283/065C08F222/06C08F220/06C08F220/02C08F220/22
Inventor 倪涛刘昭洋康静董树强
Owner SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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