The advantages of organic bismuth polyurethane catalyst are as follows:
1. Non-toxic, safe and environmentally friendly catalyst, which can replace lead and mercury catalysts and tin catalysts that are being abolished by legislation;
2. Bismuth compound ratio Tin compounds have better hydrolysis resistance, reduce the selectivity of reaction with water, and reduce side reactions between water and NCO groups in aqueous PU dispersions;
3. Promote the NCO-OH reaction and avoid NCO side reactions, especially in one-step systems, to reduce the generation of CO2;
4. In a one-component system, the amine shielded by water is released instead of promoting the reaction between NCO and water;
5. The combination of bismuth and zinc has a synergistic effect , making formulation and production more flexible, reducing energy consumption and increasing profits;
6. Can be used alone, or as an auxiliary catalyst with amines or other organometallic compounds With the use of.
OrganobismuthPolyurethane Catalyst Applications in different systems:
1. In sealants, it is recommended to try BiCAT® H first, with the addition amount starting from Start adjusting at 0.5%. If you feel the curing speed is fast, you can try BiCAT® 8.
2. In spray polyurea elastomer, it is recommended to use BiCAT® 8, BiCAT® 8118 or BiCAT® 8108, with an addition amount of 0.2%-0.5% .
3. BiCAT is recommended for resin slurries
4.Organic bismuth Zinc alloy catalyst BiCAT8 (8% bismuth, 8% zinc) replaces the mercury catalyst, and bismuth provides solidification The required gel speed, high selectivity and high rate to generate polyurethane. As a slower gel catalyst and a better cross-linking catalyst, zinc can reduce the acidity of the system, accelerate the later stage of the reaction, and provide a certain degree of cross-linking. Union. Users can also add BiCATZ (19% zinc) or BiCAT3228 (22% zinc) to the system to increase the zinc in the system, extend the kettle operation time during the induction period, and enhance the post-curing of the product without causing too much impact on the gel time. Big impact. Keep the amount of bismuth unchanged during the adjustment process, and experiment by adding different amounts of zinc to find the most suitable bismuth/zinc ratio for your system within the bismuth/zinc ratio of 1:1 to 1:10.
