Method for preparing air entraining agent for concrete

An air-entraining agent and concrete technology, which is applied in the field of concrete admixtures, can solve the problems of low concrete strength, poor air bubble quality, unstable air content, etc., and achieve the effects of excellent product performance, simple synthesis process, and improved workability

Active Publication Date: 2010-08-18
深圳市五山新材料股份有限公司
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Problems solved by technology

[0003] Currently commercially available air-entraining agents are mostly rosin soaps, alkylbenzene sulfonates and sodium lauryl sulfate air-entraining agents. Rosin soap air-entraining agents have poo

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  • Method for preparing air entraining agent for concrete
  • Method for preparing air entraining agent for concrete
  • Method for preparing air entraining agent for concrete

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[0018] The invention provides a method for preparing air-entraining agent for concrete. The rosin is crushed and oxidized in the air for about 30 days, and 100 parts of powdered rosin are put into a reaction kettle to be heated and melted; 35 to 100 parts of polyethylene glycol are added at one time, Under the action of the catalyst p-toluenesulfonic acid, the esterification reaction is carried out directly at 160 ° C ~ 230 ° C for 5 hours; after the esterification reaction is completed, the temperature is lowered to 85 ° C ~ 95 ° C and neutralized with liquid alkali, and 0 ~ 50 parts are added The modifying agent is dispersed and emulsified for 0.5h; diluted with tap water to obtain a liquid air-entraining agent with a solid content of 35±1% and a pH value of 8.5-9.5.

[0019] Specifically, the rosin includes primary or secondary rosin, which is pulverized and naturally oxidized until the color of the powder is deepened; then the powdered rosin is melted at 130°C to 160°C, and...

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Abstract

The invention discloses a method for preparing an air entraining agent for concrete, which comprises the following steps: crushing colophony into powder, and oxidizing colophony powder in the air until the color becomes dark slightly; adding the oxidized colophony powder into a reaction kettle, and heating to melt the colophony powder; adding polyethylene glycol, and carrying out esterification reaction at 160-230 DEG C under the catalysis of para-toluenesulfonic acid; neutralizing with liquid caustic soda at 85-95 DEG C, and adding a modifier; and diluting with tap water to obtain the liquid air entraining agent, of which the solid content is 35+/-1% and the pH value is 8.5-9.5. The invention has the advantages of simple synthesis technique and good product performance, and the product does not contain flammable and explosive hazardous article maleic anhydride. By using the air entraining agent, lots of fine, uniform and stable bubbles can be introduced into the concrete. After being compounded with the water reducer, the air entraining agent can obviously improve the concrete workability, enhance the concrete impermeability and frost resistance and reduce the concrete slump loss without reducing the concrete strength.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a preparation method of a concrete air-entraining agent which can significantly improve the durability of concrete. Background technique [0002] Concrete air-entraining agents can improve the workability of concrete, especially the frost resistance and impermeability of concrete, that is, the durability of concrete. Therefore, air-entraining agents are highly valued by engineering circles and scientific research workers. [0003] Currently commercially available air-entraining agents are mostly rosin soaps, alkylbenzene sulfonates and sodium lauryl sulfate air-entraining agents. Rosin soap air-entraining agents have poor solubility, unstable air content, and low concrete strength; Alkylbenzene sulfonates and sodium lauryl sulfate have disadvantages such as poor bubble quality, unstable gas content, and low strength. The present invention adopts a simple synthesis method, does not use fla...

Claims

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Application Information

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IPC IPC(8): C04B24/34C04B103/30
CPCC04B2103/601C04B2103/308C04B24/34C04B2103/304C04B2111/00241C04B40/0039
Inventor 竹国斌丁联合
Owner 深圳市五山新材料股份有限公司
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