High-hydrogen silicone oil exhibits optimal film-forming properties when reacting with platinum-group metal salts (such as chloroplatinic acid), enabling the rapid formation of uniform, stable functional films at low temperatures.
Platinum-group metal salts are currently the preferred catalysts for this process due to their high catalytic efficiency and mild reaction conditions.
For instance, chloroplatinic acid can initiate the cross-linking and curing of the silicone oil at temperatures ranging from ambient to 80°C, making it suitable for precision coating applications. While other metal salts (such as tin or titanium-based compounds) possess some catalytic activity, they are inferior to platinum-group catalysts in terms of film formation rate and uniformity.
Silicone oil films formed via platinum catalysis feature a dense, three-dimensional network structure, resulting in:
Enhanced water resistance: Water contact angles can exceed 110°.
Improved thermal stability: Capable of withstanding short-term thermal shock at temperatures up to 200°C.
Excellent adhesion: Strong bonding to substrates such as glass and metal, minimizing the risk of delamination.
Three sets of comparative experiments are required to determine the optimal formulation:
Testing gradients of platinum salt dosage (recommended concentration range: 0.1%–1%).
Testing combinations of curing temperature and duration (typically within the 50–120°C range).
Comparing substrate surface pretreatment methods (prioritizing plasma treatment or silane coupling agents).
In industrial applications, a combined platinum-tin salt system can be adopted to control costs; this approach maintains film quality while reducing catalyst costs by 30%–50%.