Advantages, types and application scope of organobismuth catalysts

Organobismuthcatalyst (DY-20) is a Environmentally friendly polyurethane catalyst is used for 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. . 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 organobismuth catalysts can be cured at room temperature or under heat, making them an excellent alternative to toxic lead, mercury and tin products.

Advantages of organic bismuth:

1. Safe and environmentally friendly, can replace lead and mercury And tin, which is being abolished by legislation;

2. It has better hydrolysis resistance, reduces the selectivity of reaction with water, and reduces the side reactions between water and NCO groups in water-based PU dispersions;

3. Promote NCO/OH reaction, avoid NCO side reactions, and reduce the generation of CO2;

4. In a one-component system, liberate the amine shielded by water and It does not promote the reaction between NCO and water;

5. The combination of bismuth and zinc has a synergistic effect, making the formulation and production more flexible, reducing energy consumption, and increasing profits;

6. Can be used alone Used, or used in combination with amines or other organometallic compounds;

Types of organic bismuth:

Bismuth isooctanoate, bismuth laurate, bismuth neodecanoate, bismuth naphthenate, bismuth oxide, bismuth nitrate, etc. Currently, the three main types used in the market are bismuth isooctanoate, bismuth laurelate, and bismuth neodecanoate.

Application scope of organic bismuth: polyurethane coating, polyurethane leather, polyurethane adhesive, polyurethane rubber, PU resin slurry, etc.