Highly thermally conductive yet highly conformable alumina filled composition and method of making same
A composition, alumina technology, applied in chemical instruments and methods, materials for heat exchange, adhesives, etc., can solve problems such as the adverse effects of elongation and softness
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example 1
[0068] One way to prepare one part of the gel precursor is to mix 7.8 g of VDT-131 (1% methylvinylsiloxane dimethicone at 1000 cSt, Gelester), 23.4 g of PS 445 (10,000 cSt Vinyl-terminated Dimethicone, United Chemical Industries Technologies), 93.6 g of 1000 cSt Dimethicone Fluid (Cean-Etsu), 0.62 g of Benzene Add tert-butyl formate (Aldrich Chemical Company), and 0.62g of vinyltriethoxysilane coupling agent (Galest Company) and other materials into a 250mL beaker, and then use Mix on an overhead mixer for 5 minutes.
[0069] 120.94 g of the gel precursor and 330.0 g of alpha-alumina were poured into a one liter pyrex vessel. The above materials were manually stirred (low specific energy process) using a 2 inch wide brass mixing paddle for 5-6 minutes until the mixture took on a homogeneous appearance. Leave one-third of the mixture and pour the remainder into a 3" diameter two-roll mill with a gear ratio of 6:5. The gap between the two rolls should be adjusted so that the m...
example 2
[0075] Part A 69.73 g made from McGeehan-Newhill 8170 silicone and alpha-alumina blend (30 wt.% C-75 unground / 70 wt.% C-75 fine-grained alumina ) 190.27g was poured into a 400mL beaker. This material was mixed by hand with a 1 inch wide stainless steel mixing pad for 5 to 6 minutes until the mixture took on a homogeneous appearance. Alumina-filled Part B was prepared using the same procedure. The manual stirring procedure is a low specific energy stirring method.
[0076] Braven del Prasti-Cord processed by computer , model DR-2025 was used for stirring. The collation of the data obtained by the mixer uses semi-automatic general data collation software version 4.0. Measurements include instantaneous torque, temperature, and blade speed, while calculation results include the above measurements and total stirring energy. 120 grams of alumina filled Part A was added to a 60 cc Bravendell mixing bowl fitted with roller blades. The material was stirred at 25° C. for 1 hour a...
example 3
[0080] One way to prepare one part of EPDM gel precursor is to mix 34.13 g of EPDM solution with 105 g of C-75 alumina, 0.52 g of phenyltriethoxysilane, and 0.35 g of tert-butyl perbenzoate in Mix in a Bravendel mixing drum. The EPDM solution is composed of 12wt.% Royal Tuf 465 (EPDM, Yuna Oyer), 1wt.% Ignox 1076 antioxidant (Ciba-Gage), 1wt.% isocyanate Triallyl urate, and 86 wt.% of mineral oil (Hytorobrito 380, Witco Ltd.).
[0081] Braven del Prasti-Cord processed by computer Model DR-2051 was used for stirring. The alumina filled EPDM gel precursor was added to an 85 cc Bravendell mixing bowl fitted with cam blades. The material was stirred at 35°C for 1 hour at a rotation speed of 30 rpm (transmission ratio 3:2). For the test piece containing C-75 unground alumina, the agitation torque dropped from 555 to 166 m-grams, a 70% drop. For the test piece containing C-75 fine-grained alumina, the stirring torque dropped from 325 to 212 m-grams, a 35% drop. The mixture h...
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