What are the classifications of accelerators?

Accelerators are a type of chemical substance widely used in industrial production, mainly used to accelerate or optimize specific chemical reactions or processes. According to their application fields and chemical characteristics, accelerators can be divided into various types, and the following are their main classifications and characteristics:

1. Rubber accelerator

Rubber accelerators are mainly used in the rubber vulcanization process, which can accelerate the crosslinking reaction between the vulcanizing agent and rubber molecules, thereby shortening the vulcanization time and reducing the vulcanization temperature. Common rubber accelerators include sulfonamides, thiazoles, thiurams, etc. Among them, sulfonamides are the most widely used due to their excellent comprehensive performance.

2. Accelerator for epoxy resin

Epoxy resin accelerators include fatty amines, anhydrides, polyetheramines, and latent catalysts. These accelerators can accelerate the curing reaction of epoxy resin and improve its performance.

3. Accelerator for polyurethane adhesive

Polyurethane adhesive accelerators mainly include amine and tin accelerators, such as triethylenediamine and dibutyltin dilaurate, which can optimize the curing process of polyurethane.

4. Accelerator for phenolic resin adhesive

Phenolic resin accelerators include stannous chloride, ferric chloride, etc., which can accelerate the curing reaction of phenolic resin.

5. Accelerator for unsaturated polyester resin adhesive

This type of accelerator includes cobalt cyclic alkane and cobalt isooctanoate, mainly used in the curing process of unsaturated polyester resins.

6. Fermentation promoter

Fermentation promoter is a composite preparation composed of yeast extract, enzyme preparation, and inorganic salts, widely used in biotechnology fields such as alcohol fermentation and starch sugar production。

7. Penetration enhancers

Penetration enhancers are mainly used to improve the efficiency of drug penetration through the skin, and ideal penetration enhancers should have characteristics such as no irritation, no pharmacological activity, and stable physicochemical properties.

8. Other accelerators

Promoters for fast curing acrylic structural adhesives, such as NA-22 and tetramethylthiourea.

Accelerator for anaerobic adhesive: such as N, N-dimethyl-p-methylaniline, triethylamine, etc.