Thermoplastic vulcanizates and process to prepare them
A technology of catalyst and composition, which is applied in the field of preparing thermoplastic vulcanizate and thermoplastic vulcanizate premix, and can solve the problems of slow absorption of oil, etc.
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[0038] During the preparation of the encapsulated vulcanization system, additional additives may be mixed with the thermoplastic polymer and the vulcanizing agent or vulcanization activator. These additives are not required, but are preferably in the melt or liquid state for mixing with the thermoplastic polymer and vulcanizing agent or vulcanization activator. If the additive is in liquid form at room temperature, melting is not required.
[0039]The encapsulant is dry blended with EAODM powder and optionally with additional thermoplastic polymer. The encapsulation system can be added in pellet or powder form. Dry mixing is a method known in the art wherein any material that is solid at the dry mixing temperature remains solid during mixing. The oil added in these methods must be liquid to be drawn into the EAODM powder. Preferably, the oil added to the EAODM powder is heated to speed up the absorption process. If the oil is a solid or waxy material at typical room temper...
Embodiment 1
[0093] The high MW EPDM in Example 1 was made in a gas phase fluidized bed process using a metallocene catalyst. The EPDM sample had a calculated polymer Mooney viscosity of approximately 156 and contained 69% ethylene, 26% propylene, 5.1% ENB, and 31% carbon black.
[0094] The formulation in the table below was used in Example 1.
[0095]
[0096] Heat the oil to 95°C on a hot plate. Stir the phenolic resin into the oil for about 10 minutes until dissolved. Polypropylene was cryoground on a ZM-1 ultracentrifugal mill (Brinkmann-Retsch) (using 4mm sieve rings and 24-tooth rotor, and using liquid nitrogen as cryogen) to facilitate laboratory scale extrusion . Add EPDM, PP, Irganox 1076, ZnO, oxidized polyethylene wax, and stannous chloride dihydrate to the Kitchen Aid mixing tank and mix with a pulverizer on the lowest rpm setting for approximately 15 seconds, then add the hot oil / phenolic mixture, and Mix for about 30 seconds. The resulting TPV premix was placed in a ...
Embodiment 2 and comparative example A
[0100]The high MW EPDM used in Example 2 was prepared using a metallocene catalyst in a gas phase fluidized bed pilot plant. The EPDM sample had a calculated polymer Mooney viscosity of approximately 200 Mooney units. EPDM is 64% ethylene, 31% propylene, 5.3% ENB and 36% carbon black. Polypropylene is a nominal 4MFI homopolymer reactor sample in powder form from a gas phase unit.
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