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Organobismuthcatalyst is anenvironmentally friendly polyurethane catalyst, used in the catalytic synthesis of polyurethane resins, adhesives, coatings, elastomers and other fields. Bismuth belongs to Group 15 in the periodic table of elements. It is the most metallic element in this group and the heaviest stable element in the periodic table of elements.
What is the difference between organobismuth and organotin?
Organotin compounds are metal organic compounds formed by the direct combination of tin and carbon elements. General formula RnSnX4-n (n=1-4, R is alkyl or aryl). There are two types of alkyl tin compounds and aromatic compounds. Its basic structure includes one-substituted, two-substituted, three-substituted and four-substituted (referring to the number of R). 10-20% of tin production is used to synthesize organotin compounds.
The main uses are: used as catalysts, stabilizers (such as dimethyltin, dioctyltin, tetraphenyltin), agricultural pesticides, and fungicides (such as dibutyltin, tributyltin, Butyltin, triphenyltin) and coatings and antifungal agents for daily necessities. In the natural environment, these compounds will decompose rapidly due to the interaction with heat, light, water, oxygen, ozone, etc. After entering the body, it is easily absorbed by the small intestine or skin, especially the trisubstituted form, which is most easily absorbed and distributed in the liver, kidneys and brain. The liver-based microsomal drug metabolizing enzyme system in the body dealkylates and dearomatizes very quickly. The biological half-life of the trisubstituted form is 3-11 days. After dealkylation, it becomes a disubstituted form or a monosubstituted form, which makes it difficult to pass the brain-blood barrier and remains in the brain for a longer time.
Organobismuth compounds have low cost, easy handling, low toxicity and low Radioactive and other green safety features. In the past 10 years, both the synthesis of new organobismuth compounds and the research of organobismuth compounds in organic synthesis, catalysts and biomedicine have been in a stage of rapid development. Organic bismuth products produced in advanced foreign countries have a history of more than 30 years and have been supplied to the European and American markets for many years. These environmentally friendly organobismuth catalysts can be cured at room temperature or under heat, making them an excellent alternative to toxic lead, mercury and tin products.
