Organobismuth is an environmentally friendly PU catalyst, mainly used to replace organotin (and organic The amount of tin added and the same drying speed) to comply with EU export standards. Now many PU products exported to the EU are returned because they cannot pass EU inspection.
Bismuth belongs to Group 15 in the periodic table of elements and is the most metallic element in this group. It is the heaviest stable element in the periodic table. 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.
It has better selectivity for NCO/OH groups, and the mechanical properties of the final product are better; the induction time is short, and the viscosity gradually increases.
1. The combination of bismuth and zinc has a synergistic effect, making the formula and production more flexible, reducing energy consumption, and increasing profits;
2. In a one-component system, liberate the amine shielded by water instead of promoting the interaction between NCO and water React;
3. Promote NCO/OH reaction, avoid NCO side reactions, and reduce CO2 Generate;
4. Can be used alone
5. Safe and environmentally friendly, can replace lead, mercury and tin which are being abolished by legislation;
6. Has better hydrolysis resistance and stability, reducing The selectivity of reaction with water reduces the side reaction between water and NCO groups in aqueous PU dispersion;
Organic Types of bismuth
Bismuth neodecanoate, bismuth isooctanoate, bismuth dilaurate, bismuth naphthenate, bismuth oxide, bismuth nitrate, etc.
At present, bismuth neodecanoate is mainly used in the market. Its application scope includes polyurethane coatings, polyurethane leather, polyurethane adhesives, polyurethane rubber, PU resin slurry, etc.
