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[Chemical Knowledge]：Manufacturing method and process of curing agent

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In the field of raw materials for chemical production, the manufacturing method
of curing agent
1. Introduction

In the production of chemical products, curing agent is an important raw material, widely used in coatings, adhesives, composite materials and other fields. There are many kinds of curing agents and different manufacturing methods. This paper mainly discusses the manufacturing methods of curing agents in the field of chemical production raw materials.

2. curing agent overview

curing agent refers to the liquid or paste resin, rubber, paint, etc. under certain conditions into a solid substance. The selection and use of curing agents are of great significance for improving the performance and quality of products. Common curing agents include amines, acid anhydrides, epoxies, etc.

3. curing agent manufacturing method

1. amine curing agent manufacturing method

amine curing agent is one of the commonly used curing agent, its manufacturing method mainly has the following several kinds:

(1) alcohol amine method: ammonia and alcohol under the action of a catalyst reaction, generating alcohol amine, and then react with aldehydes to obtain amine curing agent. The method is easy to obtain raw materials, easy to operate, but the product purity is low.

(2) chlorinated hydrocarbon method: chlorinated hydrocarbon and amine reaction, generate chlorinated amine, and then through hydrolysis, neutralization and other steps to obtain amine curing agent. The product of this method has high purity, but a large amount of hydrogen chloride waste gas will be produced in the production process.

2. manufacturing method of acid anhydride curing agent

acid anhydride curing agent has high reactivity and chemical resistance, the manufacturing method mainly has the following several kinds:

(1) carboxylic acid method: carboxylic acid and acid anhydride reagent reaction, generating acid anhydride curing agent. The raw materials of this method are easy to obtain, but the reaction conditions are harsh.

(2) Transesterification method: a new acid anhydride curing agent is generated by transesterification reaction between an ester and an acid anhydride. This method is suitable for the preparation of some special structure of the acid anhydride curing agent.

3. manufacturing method of epoxy curing agent

epoxy curing agent has excellent mechanical properties, electrical insulation properties and resistance to chemical corrosion performance, the manufacturing method mainly has the following several kinds:

(1) polyol method: polyol and epichlorohydrin reaction, generating epoxy alcohol, and then react with acid epoxy curing agent. The product of this method has high purity, but a large amount of hydrochloric acid waste gas will be produced in the production process.

(2) amine method: amine and epoxy resin reaction, generating epoxy amine curing agent. The method is easy to obtain raw materials, easy to operate, but the product performance is greatly affected by raw materials.
Precautions in the manufacturing process of
4. curing agent

In the manufacturing process of curing agent, the following matters need to be paid attention to:

1. Control the quality and ratio of raw materials to ensure stable product performance;
2. Strictly control the reaction conditions And the operation process to prevent side reactions and impurities;
3. Regularly maintain and maintain the production equipment to ensure the normal operation of the equipment;
4. Strengthen safety management and environmental protection measures in the production process to ensure production safety and environmental friendliness.

5. conclusion

In short, in the field of chemical production raw materials, the manufacturing method of curing agent is varied, and it is necessary to select the suitable manufacturing method according to the specific product performance and production process. At the same time, in the manufacturing process, attention should be paid to controlling the quality and ratio of raw materials, strictly controlling the reaction conditions and operation process, regularly maintaining and maintaining the production equipment, strengthening the safety management and environmental protection measures in the production process, so as to ensure the product quality and production safety.

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