The core function and principle of platinum curing agent
Catalytic curing mechanism
The platinum curing agent activates the vinyl groups (-CH=CH₂) in the silicone rubber molecules and the Si-H bonds in the hydrogen-containing silicone oil, initiating an addition reaction (without the release of small molecule by-products), causing the linear siloxane molecules to cross-link and form a three-dimensional network structure, thus achieving the transformation of the material from liquid to solid.
Advantages: Compared with peroxide curing agents (which may produce odors and corrosive by-products), the products of platinum catalytic curing are purer and more environmentally friendly, making it suitable for scenarios with high safety requirements (such as food contact and medical implants).
Key features
High efficiency: Trace amounts of platinum (typically at the ppm level) can significantly accelerate the reaction and shorten the curing time.
Selectivity: Only catalyzes specific addition reactions, reducing the impact of side reactions on material properties.
Environmental sensitivity: It is prone to "poisoning" and failure by compounds such as sulfur, phosphorus, and amines. The purity of raw materials and the production environment must be strictly controlled.
