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  3. Precious Metal Compounds & Homogeneous Catalysts / 
  4. Hydrosilylation Catalysts (Silicones)
For the Curing and Modification of Silicones

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.

Hydrosilylation Catalysts

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.

Karstedt formula
Karstedt Formula

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.

Broşür: Karstedt Katalizörleri ve Özelleştirilmeleri
 

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 Sonuç

Best Delivery
Quotation
5084054KARSTEDT Concentrate 0,5%68478-92-2Pt0.40 - 0.60 SolutionO[Si(CH3)2CH=CH2]2PtEMEA, APACOnline available
5092513Trimethyl-(methylcyclopentadienyl)­-platin94442-22-5PtSolid(MeCp)PtMe3Request a quote
5125598Karstedt Catalyst 0.5%68478-92-2Pt0.50SolutionO[Si(CH3)2CH=CH2]2PtAMEROnline available
5126966Ashby's Catalyst68585-32-0Pt1.50 - 2.00 SolutionPtC12H24O4Si4AMERRequest a quote
5126969Karstedt Catalyst 16-20%68478-92-2Pt16.00 - 20.00 Solution[Pt2(C8H18OSi2)3]AMEROnline available
5126979Karstedt Catalyst 10%68478-92-2Pt9.50 - 10.50 Solution[Pt2(C8H18OSi2)3]AMEROnline available
5126983Karstedt Catalyst 2%68478-92-2Pt1.95 - 2.05 Solution[Pt2(C8H18OSi2)3]AMEROnline available
5126994Karstedt Catalyst in Xylene 2%68478-92-2Pt1.95 - 2.05 Solution[Pt2(C8H18OSi2)3]AMEROnline available
5126996Karstedt Catalyst in Xylene 5%68478-92-2Pt4.50 - 5.50 Solution[Pt2(C8H18OSi2)3]AMEROnline available
5126998Karstedt Catalyst in Xylene 10%68478-92-2Pt9.50 - 10.50 Solution[Pt2(C8H18OSi2)3]AMEROnline available
5127000Karstedt Catalyst in Toluene 5%68478-92-2Pt4.80 - 5.20 Solution[Pt2(C8H18OSi2)3]AMEROnline available
5127002Karstedt Catalyst in Vinyl Pol68478-92-2Pt0.45 - 0.56 Solution[Pt2(C8H18OSi2)3]AMEROnline available
5127006Karstedt Catalyst Andisel 4%68478-92-2Pt4.00Solution[Pt2(C8H18OSi2)3]AMEROnline available
5127008Karstedt Catalyst Andisel 1%68478-92-2Pt1.00Solution[Pt2(C8H18OSi2)3]AMEROnline available
5127017Karstedt Catalyst Fast Cure 2%68478-92-2Pt2.00 - 2.20 Solution[Pt2(C8H18OSi2)3]AMEROnline available
81147222Dichloro(cycloocta-1,5-diene)­platinum(II)12080-32-9Pt51.00 - 53.00 SolidPtC8H12Cl2EMEA, APACOnline available
81147390KARSTEDT Concentrate 10%68478-92-2Pt9.50 - 10.50 SolutionO[Si(CH3)2CH=CH2]2PtEMEA, APACOnline available
81147413Chloroplatinic Acid 'CPA'26023-84-7Pt39.90 - 40.10 SolidH2PtCl6 · xH2OEMEA, APACOnline available
81147519KARSTEDT Concentrate 20%68478-92-2Pt19.00 - 21.50 SolutionO[Si(CH3)2CH=CH2]2PtEMEA, APACOnline available
81147525KARSTEDT Concentrate 2%68478-92-2Pt1.70 - 2.30 SolutionO[Si(CH3)2CH=CH2]2PtEMEA, APACOnline available
81147528KARSTEDT Concentrate 2% Super Cure68478-92-2Pt1.70 - 2.30 SolutionO[Si(CH3)2CH=CH2]2PtEMEA, APACOnline available

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Bin (Simon) Shang
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+86 21 3357 5679
Ryuichi Karasawa
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Ryuichi Karasawa