Preparation method of air entraining agent applied to preparation of modified cassava starch-polycarboxylic acid composite water reducing agent

Abstract

The invention discloses a preparation method of an air entraining agent applied to preparation of a modified cassava starch-polycarboxylic acid composite water reducing agent, and belongs to the fieldof building materials. The preparation method of the air entraining agent comprises the following steps: putting rosin powder, p-toluenesulfonic acid and sodium hydroxide into a reaction kettle, adding water accounting for 50% of the total mass of the mixture A, mixing and stirring for 30 minutes, heating to 80 DEG C, keeping the temperature for 50 minutes, heating to 80 DEG C, and keeping the temperature for 45 minutes; heating the mixed solution A to 85 DEG C, slowly adding pentaerythritol and tall oil, keeping the temperature for 35 minutes, heating to 70-85 DEG C, slowly adding mahogany petroleum sulfonate, and keeping the temperature for 1 hour to obtain the air entraining agent. The air entraining agent has a good air entraining effect, the average pore diameter of air entraining bubbles is small, the durability of concrete is remarkably improved, meanwhile, the workability of the concrete is obviously improved, the slump loss of the concrete is reduced, and the strength of theconcrete is not reduced.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for preparing an air-entraining agent used in the preparation of a modified tapioca starch-polycarboxylic acid composite water reducer. Background technique [0002] In concrete, the use of high-quality air-entraining agents can significantly improve the performance of plastic concrete and hardened concrete, and can also reduce the cost of admixtures and concrete. The research and application of high-quality air-entraining agents is the need and necessity of the development of concrete and its admixtures in my country. The development, promotion and application of air-entraining agents are of far-reaching significance and should be the necessary admixtures for the development of high-performance concrete in the future. However, most existing air-entraining agents have deficiencies such as unreasonable introduction of bubble structure, uneven distribution, unstable bubbl...

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Problems solved by technology

[0007] The purpose of the present invention is to propose a method for preparing an air-entraining agent used in the preparation of modified cassava starch-polycarboxylic acid composite water reducer, so as to solve the unreasonable and unstable bubble structure introduced by the air-entraining agent in the prior art , uneven distribution, inappropriate size and other deficiencies, can not effectively solve the problem of workability of freshly mixed concrete

It can also solve the technical problems that the existing water reducer products are toxic, non-biodegradable, and discharge a large amount of toxic waste liquid during the production process, and it is difficult to meet the requirements of green and environmental protection.

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