Maximum quantity allowed is 999
Platinum-catalyzed curing of silicones is widely used in the production of release coatings and silicone rubber products and is applied across various fields, ranging from industrial applications to medical materials and everyday consumer products such as cookware.1) Among silicone curing catalysts, platinum catalysts for hydrosilylation (e.g., Karstedt catalyst) are well known.2) Karstedt catalyst offers advantages such as high activity and ease of handling; however, they also have drawbacks, including the high cost of platinum and poor selectivity. In addition, during silicone manufacturing, it is extremely difficult to recover platinum catalysts incorporated into the resin, and as a result, most of the platinum is not recovered or reused. Furthermore, conventional platinum catalysts are prone to deactivation through a phenomenon known as "poisoning," in which their activity is reduced by reaction with components containing heteroatoms such as nitrogen, sulfur, and phosphorus. This makes it difficult to add additives or functional groups containing these elements to the material. The iron catalyst (Product No. B6618), which does not contain rare metals, exhibits high activity in hydrosilylation reactions while overcoming the drawbacks of conventional platinum catalysts.3)
This product has been commercialized under the technical instruction of Professor Masahiro Kamitani, and under an invention license by Kitasato University.
When a mixture of poly(methylhydrosiloxane) (HA) and a methylvinylsiloxane–dimethylsiloxane copolymer (VA) reacts in the presence of the iron catalyst (Product No. B6618), cured silicone rubber is formed. Reducing the catalyst loading increases the curing time; however, the curing reaction proceeds even at a catalyst concentration as low as 1 ppm. The color of the cured silicone rubber depends on the amount of the iron catalyst: at 100 ppm, a yellowish-brown rubber is obtained, whereas at 1 ppm, an almost colorless rubber is obtained.
