Organobismuth Catalyst product – bismuth isooctanoate can be used as a catalyst for polyurethane elastomers. This catalyst has the advantages of high efficiency, non-toxicity, and green environmental protection. It can replace the currently used heavy metal catalysts such as organotin, lead, and mercury that are highly toxic. It belongs to the field of catalyst preparation technology.
Polyurethane elastomer is a unique kind of polyurethane elastomer, which is composed of soft segments and hard segments alternately inlaid, and contains many Polar polymer with urethane groups. The soft segment is usually composed of oligomer polyols, while the hard segment is usually composed of diisocyanate and small molecule chain extenders. By selecting the appropriate structure and ratio of soft and hard segments, the physical and mechanical properties of polyurethane elastomer can be changed and adjusted within a wide range; and the microphase separation structure formed by the strong electrostatic interaction between hard segments makes Its good biological and blood compatibility, coupled with the fact that polyurethane is easy to process and shape, and can be sterilized by common methods, make it increasingly widely used in the biomedical field.
In the synthesis of polyurethane elastomer, in order to speed up the reaction and achieve rapid curing, it is often necessary to add a catalyst. Commonly used catalysts include tertiary amines, organic tin, organic lead and organic mercury catalysts. Bismuth organic acid is a new non-toxic, green and environmentally friendly catalyst developed in recent years for the synthesis of polyurethane materials. When used in polyurethane elastomers, it has better hydrolysis stability than tin compounds. Application results show that it can significantly reduce the product’s The generation of bubbles can greatly increase the reaction speed. Its reaction mechanism is obviously different from that of organotin. It can promote the reaction of isocyanate group (-NCO) and hydroxyl group (-OH) and avoid the side reaction of -NCO.
It can not only increase the speed of polyurethane synthesis reaction, but also adjust the reactivity of polyols with different relative molecular weights and isocyanates, making the prepared polyurethane preform The polymer has a narrow molecular weight distribution and low viscosity; at the same time, this type of catalyst is also non-toxic, harmless to the human body, and safe, so it can be used to synthesize medical and daily polyurethane materials to replace currently used Catalysts for heavy metals such as organic tin, lead, and mercury that are highly toxic.
Bismuth isooctanoate is a highly efficient organic bismuthCatalyst can be used in the production of polyurethane synthetic leather slurry, coatings, adhesives, sealants, track glue, elastomers, foam plastics and other products. It can also be added to PVC products as a heat stabilizer to improve its heat stability.
