Method for preparing concrete air-entraining agent

A technology of air-entraining agent and concrete, which is applied in the field of preparation of concrete air-entraining agent, can solve the problems of complicated processing technology and high production cost, and achieve the effects of simple processing technology, low production cost and improved other properties

Inactive Publication Date: 2018-04-13
池州市知识产权服务中心有限公司
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Problems solved by technology

[0004] The present invention proposes a kind of preparation method of concrete air-entraining agent in order to overcome above-mentioned emulsion air-entraining agent processing technology of the alkyl hydrogen-containing polysiloxane containing active hydrogen complex and high production cost. Polysiloxane concrete air-entraining agent, polysiloxane concrete air-entraining agent has simple processing technology and low production cost, and has a stable and significant effect on improving the freeze-thaw resistance and durability of concrete. Other properties of concrete can also be improved, and water can be reduced. Heat up

Method used

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preparation example Construction

[0023] combine figure 1 , a preparation method of concrete air-entraining agent, comprising the following steps:

[0024] S1, select ethanol, hydrochloric acid, ethanol and hydrochloric acid are mixed to undergo a substitution reaction to obtain ethyl chloride; the molar ratio of ethanol to hydrochloric acid is 1:1;

[0025] S2. After drying the silicon powder and feeding it with nitrogen, add the ethyl chloride obtained in step S1 for a synthesis reaction, and obtain an alkyl hydrochlorosilane monomer through dedusting, condensation, storage and fractionation; the silicon powder is 1200 mesh; The fractional distillation temperature is 70-80°C;

[0026] S3. Add the alkyl hydrogen-containing chlorosilane monomer obtained in step S2 into an ethanol solvent to undergo a hydrolysis reaction, and undergo oil-water separation, neutralization and drying, and vacuum distillation to obtain an alkyl hydrogen-containing polysiloxane; during neutralization and drying Add desiccant;

[...

Embodiment 1

[0029] A preparation method for concrete air-entraining agent, comprising the following steps:

[0030] S1, select ethanol and hydrochloric acid according to 1:1, mix ethanol and hydrochloric acid to undergo a substitution reaction to obtain ethyl chloride;

[0031] S2. After drying the silicon powder into nitrogen gas, the silicon powder is 1200 mesh, and then add the ethyl chloride obtained in step S1 for a synthesis reaction, and obtain the alkyl hydrochlorosilane monomer through dedusting, condensation, storage, and fractionation. The fractional distillation temperature is 70°C;

[0032] S3. Add the alkyl hydrogen-containing chlorosilane monomer obtained in step S2 into an ethanol solvent to undergo a hydrolysis reaction. After oil-water separation, neutralization and drying, a desiccant is added during the neutralization and drying, and the alkyl hydrogen-containing polysilane is obtained by distillation under reduced pressure. Silicone;

[0033] S4. Add the alkyl hydro...

Embodiment 2

[0035] A preparation method for concrete air-entraining agent, comprising the following steps:

[0036] S1, select ethanol and hydrochloric acid according to 1:1, mix ethanol and hydrochloric acid to undergo a substitution reaction to obtain ethyl chloride;

[0037] S2. After drying the silicon powder into nitrogen gas, the silicon powder is 1200 mesh, and then add the ethyl chloride obtained in step S1 for a synthesis reaction, and obtain the alkyl hydrochlorosilane monomer through dedusting, condensation, storage, and fractionation. The fractional distillation temperature is 80°C;

[0038] S3. Add the alkyl hydrogen-containing chlorosilane monomer obtained in step S2 into an ethanol solvent to undergo a hydrolysis reaction. After oil-water separation, neutralization and drying, a desiccant is added during the neutralization and drying, and the alkyl hydrogen-containing polysilane is obtained by distillation under reduced pressure. Silicone;

[0039] S4. Add the alkyl hydro...

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Abstract

The invention provides a preparation method of concrete air-entraining agent, which relates to the technical field of concrete air-entraining agent production and processing. Hydrochloric acid, ethanol, silicon powder, and emulsifier are used as main raw materials, and are subjected to dust removal, condensation, storage, fractionation, hydrolysis, and oil-water separation. Polysiloxane concrete air-entraining agent can be obtained through processes such as neutralization, drying, and high-speed dispersion. The preparation method of the concrete air-entraining agent of the present invention, the prepared polysiloxane concrete air-entraining agent has simple processing technology and low production cost, has a stable and remarkable effect on improving the freeze-thaw resistance durability of concrete, and other performances of concrete can also be improved to some extent. Reduces heat of hydration.

Description

technical field [0001] The invention relates to the technical field of production and processing of concrete air-entraining agents, in particular to a preparation method of concrete air-entraining agents. Background technique [0002] Adding air-entraining agents to concrete can improve the durability of concrete and the rheological properties of freshly mixed concrete; adjust the setting and hardening performance and gas content of concrete; provide special properties for concrete. The use of air-entraining agent is one of the important measures to ensure the frost resistance and durability of hydraulic concrete. At present, the concrete antifreeze admixtures used at home and abroad mainly include three major types of products: air-entraining agents of various surfactants and air-entraining water reducers. This type of admixtures has been widely used; concrete reactive induction Air agent, which is an emulsion of alkyl hydrogen-containing polysiloxane containing active hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C08G77/12C04B103/30
CPCC04B40/0046C04B2103/304C08G77/12C04B24/42C04B24/32
Inventor 魏柏银
Owner 池州市知识产权服务中心有限公司
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