Organic Tin Series

Organotin catalysts are a type of organic compound containing carbon tin bonds, which play an important role in various fields, especially in the production of polyurethane and other products. The following is a detailed introduction to organotin catalysts:

Definition and Structure

• definitionOrganotin catalysts are metal organic compounds formed by the direct combination of tin and carbon elements, with the general formula RnSnX4- (n=1-4, R is alkyl or aromatic).

• structureOrganotin compounds are mainly divided into two categories: alkyl tin compounds and aromatic compounds. Their basic structures include mono -, di -, tri -, and tetra substituents (referring to the number of R).

purpose

• Production of polyurethane and other productsOrganotin catalysts are widely used in polyurethane foam, coatings, elastomers, adhesives, resins and other industries.

• Specific chemical reactionsSuch as the synthesis of alcohols, acids, ketones, aldehydes, as well as rearrangement reactions of halogenated aromatic hydrocarbons, epoxidation reactions, etc.

Typical types

• Dibutyltin dilaurate: It is a strong gel catalyst, widely used in elastomer, adhesive, sealant, paint, hard foam, molded foam and other fields. At the same time, it can also be used as a heat stabilizer for PVC soft transparent products, a catalyst for silicone rubber, a photothermal stabilizer for polyacrylic adhesives and phenolic resins, etc.

• Stannous octanoate: The basic catalyst for the production of polyurethane foam is also suitable for the catalysis of room temperature curing silicone rubber, polyurethane rubber and polyurethane coating. Although its chemical properties are extremely unstable, it is non-toxic and corrosive, can be stored for 12 months, and can be used to manufacture medical supplies.

• Di (dodecyl sulfide) dibutyltinHas good hydrolytic stability, high catalytic activity, and stable storage, commonly used in micro controlled elastomers and rigid foams.

• Dibutyl tin diacetate Mainly used as a curing catalyst for room temperature silicone rubber, especially suitable for deacetylated silicone products, with a faster catalytic rate than dibutyltin dilaurate.

Preparation and Properties

• Preparation methodThere are various methods for preparing organotin catalysts, including adding organotin organic solution to silica sol or adding oxide powder and preparing them under specific reaction conditions.

• chemical propertyThe catalytic effect of organotin catalysts is based on the good electron affinity and nucleophilic activity of paramagnetic tin ions, which can undergo electrophilic attack reactions with substrates.

advantage

• Compared with traditional catalysts, organotin catalysts have advantages such as high catalytic efficiency, fast reaction rate, mild reaction conditions, and less toxicity or thermodynamic effects on substrates. In addition, its catalyst is easy to prepare, cost-effective, and has a wide range of applications.

summary

Organotin catalysts play an important role in the chemical industry due to their unique chemical structure and wide range of applications. With the deepening of research, its performance and application prospects will be further expanded and optimized.