Common organotin catalysts

Common organotin catalysts
Organotin compounds are metal organic compounds formed by the direct combination of tin and carbon. The general formula RnSnX4 – (n=1-4, R is alkyl or aromatic). There are two kinds of alkyl tin compounds and aromatic compounds. Its basic structure includes one substituent, two substituents, three substituents and four substituents (referring to the number of R). 10-20% of tin output is used to synthesize organic tin compounds.
Organotin catalysts are usually used in the production of polyurethane and other products, especially in the industries of polyurethane foam, coating, elastomer, adhesive, resin, etc.
Chinese name: organic tin catalyst
Use: production and application of polyurethane foam and coating

Common
Dibutyltin dilaurate
Dibutyl tin dilaurate is a strong gel catalyst, which can be used for elastomer, adhesive, sealant, paint, hard foam, molded foam, RIM, etc. Dibutyltin dilaurate is also a heat stabilizer, mainly used in the processing of PVC soft transparent products, silicone rubber catalyst, and photothermal stabilizer of polyacrylate and phenolic resin.
Stannous octanoate
The basic catalyst for the production of polyurethane foam, room temperature curing silicone rubber, polyurethane rubber, and catalyst for polyurethane coating.
The chemical property is extremely unstable and easy to be oxidized. Stannous caproate is the abbreviation of 2:1 ethyl stannous caproate. 2-ethylic acid reacts with sodium hydroxide to form 2-ethyl-b. Sodium acid and stannous chloride are then heated in an inert solvent for double decomposition reaction. Adding a small amount of antioxidant – 264 in the reaction pot can improve the tin content and stability of 2-ethylhexanoic acid.
Stannous octanoate is soluble in polyols and most organic solvents, but insoluble in alcohol and water. Stannous octanoate can be stored for 12 months, but it must be sealed and stored in a dry place. Stannous octanoate is non-toxic and corrosive, and can be used to manufacture medical supplies.
Di (dodecyl sulfide) dibutyltin
Strong gel catalyst with good hydrolysis stability, catalytic activity higher than dibutyltin dilaurate, stable storage, used for micro control elastomer and hard foam.
Dibutyl tin diacetate
The gel catalyst is mainly used as the curing catalyst of room temperature silicone rubber, especially for the deacetic silicone products; Its characteristic is that its catalytic speed is faster than dibutyltin dilaurate, and it can be used for polyurethane elastomer, spraying rigid polyurethane foam, rigid foam high resilience molding foam, etc.
Because the influence of steric hindrance on catalytic activity decreases with the increase of temperature, using alkyl with larger steric hindrance to replace the group with smaller steric hindrance can make organic tin compounds have higher stability, hydrolysis resistance and delayed catalytic activity. For example, using dioctyl tin instead of dibutyl tin can play a delayed catalytic role. The hydrolysis stability can be improved by replacing dibutyltin dilaurate with dialkyltin dimethyl maleate and dithiol alkyl tin. Tin mercaptans containing large alkyl groups have two functions: high stability and delayed catalysis, such as dioctyl tin mercaptan.