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Organotin catalyst

Organotin catalyst
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The organotin compound is a metal organic compound formed by direct bonding of tin and carbon. There are two types of alkyl tin compounds and aromatic compounds. 10-20% of the tin production is used to synthesize organotin compounds. Organotin catalysts are commonly used in the production of polyurethanes and other products, especially in the polyurethane foam, coatings, elastomers, adhesives, resins and other industries.
1. Common organotin catalysts:
1) Dibutyltin dilaurate A strong gel catalyst for elastomers, adhesives, sealants, coatings, rigid foams, molded foams, RIM, etc.
Dibutyltin dilaurate is also a heat stabilizer, mainly used in the processing of PVC soft-transparent products, silicone rubber catalysts, polyacrylamide and photothermal stabilizers for phenolic resins.
2) Stannous octoate is used as a catalyst for the production of polyurethane foam, a catalyst for room temperature curing silicone rubber, urethane rubber and polyurethane coating.
The chemical properties are extremely unstable and highly susceptible to oxidation. Stannous octoate is an abbreviation for 2:1 ethyl stannous hexanoate. 2-Ethyl acid is reacted with sodium hydroxide to form 2-ethyl B. Sodium 1 is then prepared by metathesis reaction with stannous chloride in an inert solvent, and a small amount of antioxidant -264 is added to the reaction pot to increase the tin content and stability of 2-ethylhexanoic acid.
Stannous octoate is soluble in polyols and most organic solvents, insoluble in alcohols and water. Stannous octoate can be stored for 12 months, but must be sealed and stored in a dry place. Stannous octoate is non-toxic and corrosive and can be used in the manufacture of medical supplies.
3) Di-(dodecylsulfide) dibutyltin is a strong gel catalyst with good hydrolytic stability. Its catalytic activity is more stable than that of dibutyltin dilaurate, and it is used for micro-controlling elastomers and rigid foams.
4) Dibutyltin diacetate gel catalyst, mainly used as a room temperature silicone rubber curing catalyst, especially suitable for deacetic acid type silicone products; characterized by faster catalytic speed than dibutyltin dilaurate, which can be used for polyurethane elastomers, Spray hard polyurethane foam, hard foam high resilience molded foam, etc.
2. The influence of steric hindrance on the catalytic activity of other organotin catalysts decreases with the increase of temperature. The substitution of the sterically hindered alkyl group for the group with smaller steric hindrance makes the organotin compound have higher stability. Sexual, hydrolysis resistant, and delayed catalytic activity, such as the replacement of dibutyltin with dioctyltin, can delay the catalysis. Hydrolysis stability can be improved by using dialkyltin dimaleate or alkyltin dithiolate in place of dibutyltin dilaurate. The tin thiolate containing a large alkyl group has two functions of high stability and delayed catalysis, such as dioctyltin thiolate.
3. Dilution solvents for organotin catalysts There are many solvents for diluting organotin catalysts, such as esters, ketones, and benzenes. Commonly used are polyether, ethyl acetate, ethylene glycol, diethylene glycol, or PPG and T9 mixed in a certain ratio. The laboratory is usually diluted with DPG.

The organotin compound is a metal organic compound formed by direct bonding of tin and carbon. Formula RnSnX4-(n=1-4, R is an alkyl group or an aromatic group). There are two types of alkyl tin compounds and aromatic compounds. Its basic structure has a substituent, a disubstituted, a trisubstituted, and a tetrasubstituted (referring to the number of R). 10-20% of the tin production is used to synthesize organotin compounds.
Organotin catalysts [1] are commonly used in the production of polyurethanes and other products, especially in polyurethane foams, coatings, elastomers, adhesives, resins and other industries.

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