Hydrosilylation Catalysts
One of the most important methods to cure and modify silicone is the hydrosilylation reaction under the use platinum-based catalysts.
During the curing process a vinyl component reacts with a crosslinker with multiple Si-H groups to yield an elastic polymer.
The use of platinum as a homogeneous catalyst facilitates the reaction at a very low platinum loading.
Overview of the Most Important Hydrosilylation Catalysts
The well-known Karstedt’s catalyst is the most used hydrosilylation catalyst, as it is highly active, easy to handle and safe to use. The Ashby’s catalyst is more suitable for high temperature curing, commonly used in high temperature extruded silicone systems. The Lamoreaux’ catalyst on the other hand is for example applied for silicone rubbers with improved fire-retardant properties. Lastly there is the hydrosilylation catalyst (MeCp)PtMe3. In contrast to the other three catalysts, it is activated by UV.
Heraeus Precious Metals offers all mentioned hydrosilylation catalysts, with the Karstedt’s catalyst being the most requested and important one.
Karstedt’s Catalysts
Heraeus Precious Metals is a major supplier of Karstedt’s catalysts for the silicones market. Our range of Karstedt’s catalysts provide curing characteristics for every application. The Karstedt’s catalyst can be shipped in various dilutions with solvents to meet customer needs. Heraeus’ catalysts are produced with a narrow variance, which minimizes catalyst waste while delivering constant activity designed for a steady process. The homogeneous Karstedt’s catalysts is typically employed in very low concentrations (30–100ppm) and remains in the silicones. Where homogeneous catalysts are not an option, Heraeus also offers a broad range of suitable heterogeneous catalysts.
Advantages of Karstedt’s Catalyst in Hydrosilylation Reactions
- Fast Reaction
- Full control of curing process
- No volatile by-products
- No shrinkage of the Polymer
Advantages of Heraeus´ Karstedt Catalysts
Heraeus offers customized formulations of the Karstedt’s catalyst tailored to the customer needs. Possible modifications include the activity, viscosity, solvent and platinum content. Further information is included in the brochure below.
|
Low Turbidity |
Super Cure |
Heat Resistant |
|
|---|---|---|---|
| Advantage | Avoid filtration and platinum losses after dilution with silicone polymer | Faster curing time at room temperature | High resistance to heat and stress |
| Shelf life | Standard shelf life | Less shelf life | Longer shelf life |
| Application Example | Transparent silicones | Dental applications | Paper release coating |
UV Curing Catalysts
As an alternative to thermal curing, UV curing with a photoactive catalyst can be utilized for the hydrosilylation reaction. This method is especially useful for the crosslinking of thermally sensitive polymers because no additional heat is required. Moreover, the inclusion of heat-sensitive parts such as electronic parts is enabled. Heraeus offers the UV activated catalyst (MeCp)PtMe3. Applications for UV curing are for example adhesives or dental applications. Benefits include improved curing time for liquid silicone elastomers and a more energy-efficient process because no heating ovens are required.
Catalyst Portfolio for Hydrosilylation of Silicones
21 Results
Product Name | PM Range [%] | Details | ||||
|---|---|---|---|---|---|---|
| 5084054 | 68478-92-2 | KARSTEDT Concentrate 0,5% (O[Si(CH3)2CH=CH2]2Pt) | Pt: 0.40 - 0.60 % | Solution | Details | |
| 5092513 | 94442-22-5 | Trimethyl-(methylcyclopentadienyl)-platin ((MeCp)PtMe3) | Pt: % | Solid | Details | |
| 5125598 | 68478-92-2 | Karstedt Catalyst 0.5% (O[Si(CH3)2CH=CH2]2Pt) | Pt: 0.50 % | Solution | Details | |
| 5126966 | 68585-32-0 | Ashby's Catalyst (PtC12H24O4Si4) | Pt: 1.50 - 2.00 % | Solution | Details | |
| 5126969 | 68478-92-2 | Karstedt Catalyst 16-20% ([Pt2(C8H18OSi2)3]) | Pt: 16.00 - 20.00 % | Solution | Details | |
| 5126979 | 68478-92-2 | Karstedt Catalyst 10% ([Pt2(C8H18OSi2)3]) | Pt: 9.50 - 10.50 % | Solution | Details | |
| 5126983 | 68478-92-2 | Karstedt Catalyst 2% ([Pt2(C8H18OSi2)3]) | Pt: 1.95 - 2.05 % | Solution | Details | |
| 5126994 | 68478-92-2 | Karstedt Catalyst in Xylene 2% ([Pt2(C8H18OSi2)3]) | Pt: 1.95 - 2.05 % | Solution | Details | |
| 5126996 | 68478-92-2 | Karstedt Catalyst in Xylene 5% ([Pt2(C8H18OSi2)3]) | Pt: 4.50 - 5.50 % | Solution | Details | |
| 5126998 | 68478-92-2 | Karstedt Catalyst in Xylene 10% ([Pt2(C8H18OSi2)3]) | Pt: 9.50 - 10.50 % | Solution | Details | |
| 5127000 | 68478-92-2 | Karstedt Catalyst in Toluene 5% ([Pt2(C8H18OSi2)3]) | Pt: 4.80 - 5.20 % | Solution | Details | |
| 5127002 | 68478-92-2 | Karstedt Catalyst in Vinyl Pol ([Pt2(C8H18OSi2)3]) | Pt: 0.45 - 0.56 % | Solution | Details | |
| 5127006 | 68478-92-2 | Karstedt Catalyst Andisel 4% ([Pt2(C8H18OSi2)3]) | Pt: 4.00 % | Solution | Details | |
| 5127008 | 68478-92-2 | Karstedt Catalyst Andisel 1% ([Pt2(C8H18OSi2)3]) | Pt: 1.00 % | Solution | Details | |
| 5127017 | 68478-92-2 | Karstedt Catalyst Fast Cure 2% ([Pt2(C8H18OSi2)3]) | Pt: 2.00 - 2.20 % | Solution | Details | |
| 81147222 | 12080-32-9 | Dichloro(cycloocta-1,5-diene)platinum(II) (C8H12Cl2Pt) | Pt: 51.00 - 53.00 % | Solid | Details | |
| 81147390 | 68478-92-2 | KARSTEDT Concentrate 10% (O[Si(CH3)2CH=CH2]2Pt) | Pt: 9.50 - 10.50 % | Solution | Details | |
| 81147413 | 26023-84-7 | Chloroplatinic Acid 'CPA' (H2PtCl6 · xH2O) | Pt: 39.90 - 40.10 % | Solid | Details | |
| 81147519 | 68478-92-2 | KARSTEDT Concentrate 20% (O[Si(CH3)2CH=CH2]2Pt) | Pt: 19.00 - 21.50 % | Solution | Details | |
| 81147525 | 68478-92-2 | KARSTEDT Concentrate 2% (O[Si(CH3)2CH=CH2]2Pt) | Pt: 1.70 - 2.30 % | Solution | Details | |
| 81147528 | 68478-92-2 | KARSTEDT Concentrate 2% Super Cure (O[Si(CH3)2CH=CH2]2Pt) | Pt: 1.70 - 2.30 % | Solution | Details |
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