1. Organic Bismuth
Bismuth belongs to Group 15 in the periodic table of elements. It is a highly metallic element in this group and a heavy and stable element in the periodic table of elements. Bismuth compounds have green and safe properties such as low cost, easy handling, low toxicity and low radioactivity. In the past 10 years, both the synthesis of new organobismuth compounds and the research on organobismuth compounds in organic synthesis, catalysts and biomedicine have been at a leading level. Rapid development stage. 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 organic bismuth catalysts can be cured at room temperature or heated. They are an excellent choice to replace toxic lead, mercury and tin products, and are currently widely used at home and abroad.
2. Classification of organic bismuth: Organic bismuth can be divided into bismuth isooctanoate, bismuth dilaurate, bismuth neodecanoate, bismuth naphthenate, bismuth oxide, bismuth nitrate, etc. Currently, three types of products are mainly used in the market: bismuth isooctanoate, bismuth dilaurate, and bismuth neodecanoate.
3. Advantages of organic bismuth
1. Safe and environmentally friendly, it can replace lead Mercury and tin, which are being abolished by legislation;
2. Can be used alone or in combination with amines or other organometallic compounds;
3. Promote NCO/OH reaction and avoid NCO Side reactions, reducing the generation of CO2;
4. The combination of bismuth and zinc has a synergistic effect, making the formula and production more flexible, reducing energy consumption, and increasing profits;
5. In single In the component system, the amine shielded by water is released instead of promoting the reaction between NCO and water;
6. Organobismuth has better hydrolysis resistance and stability, reduces the selectivity of reaction with water, and reduces side reactions between water and NCO groups in aqueous PU dispersions.
