1, 3-divinyl-1,1,3, 3-tetramethyldisiloxane platinum (0)
CAS No.：68478-92-2
Molecular Formula:O[SI(CH3)SUB>2CH=CH2]2PT
Molecular Weight:381.48
MDL:MFCD00151662
Alias:KARSTEDT CATALYST ;1, 3-divinyl-1,1,3, 3-tetramethyldisiloxane platinum (0)
Chemical Property
Light yellow liquid, insoluble in water, soluble in toluene, xylene, isopropyl alcohol, double vinyl silicone oil. Stable in the air.
Quantity Standard
Bullion Content：0.1% - 5.0%
Usage
Used to catalyze Hydrogen silication reaction
Storage mode
Sealed storage
he liquid silicone rubber becomes an elastic solid under heating conditions or normal temperature conditions, mainly because vinyl silicone and hydrogen-containing silicone under the catalysis of platinum catalyst to make hydrogen silicification reaction happens, the result of reaction is that liquid becomes solid, and the physical properties will not change or will not change for a long time after becoming solid at room temperature and pressure. The reaction is as follows:
Among them, the platinum catalyst has a key role, in the chemical reaction, many times the catalyst and reaction conditions are needed to promote the chemical reaction of two substances, thus becoming another substance. From the equation, we can see that the liquid silicone rubber containing vinyl (unsaturated group) and the liquid silicone rubber containing hydrogen (unsaturated group) are cross-linked into dimethylene (saturated group) under the catalysis of platinum catalyst. When the molecule becomes saturated, it also becomes solid. This is why liquid silica gel can be screen printed on the surface of the garment and then solidified on the surface of the garment after continuous heating for a period of time.
The composition of the platinum catalyst is not complicated,which mainly contains polydimethylsiloxane which is an end-sealing agent to terminate rearrangement in the pyrolysis rearrangement, and its molecular structure is as follows:
Add a trace particle size of fine platinum powder to the end agent, the content is between 0.1% and 5.0%, the specific content depends on the curing speed required by the practical application, the molecular expression is as follows:
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