Composite material with directional arrangement of fillers and preparation method thereof
A technology of directional arrangement and composite materials, which is applied in the field of new materials and its preparation, can solve problems such as directional arrangement of difficult fillers, achieve obvious cooling effect, cheap and easy-to-obtain raw materials, and reduce interface thermal resistance
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Examples
Embodiment 1
[0030] First mix 100g of methyl vinyl silicone rubber and 1g of curing agent (2,4-dichlorobenzoyl peroxide) in a kneader, then add 30g of graphene powder and mix for 2h. The mixture is taken out, and the mixture is repeatedly extruded 10 times with a double-roll mill, etc., with a gap of 0.5mm between the two rollers; and the mixture is extruded into a thin sheet with a thickness less than 0.5mm. The extruded flake mixture is laminated and further pressed into blocks. Slice the block in the vertical direction; heat and pressurize the cut sheet and solidify it to form a graphene silica gel composite heat-conducting material in which graphene is oriented in the axial direction (that is, the direction perpendicular to the plane where the sheet is located).
[0031] The macroscopic morphology of the graphene composite thermal interface material prepared in this example is as follows: image 3 As shown in the optical photos in , the material has good flexibility and elasticity, ca...
Embodiment 2
[0035] First mix 100g of vinyl silicone oil and 1g of curing agent (hydrogen-containing silicone oil) in a kneader, then add 30g of graphene powder and mix for 2h. The mixture is taken out, and the mixture is repeatedly extruded 10 times with a double-roll mill, etc., with a gap of 0.5mm between the two rollers; and the mixture is extruded into a thin sheet with a thickness less than 0.5mm. The extruded flake mixture is laminated and further pressed into blocks. The block is sliced in the vertical direction; the cut sheet is heated, pressurized, solidified and molded to obtain a composite heat-conducting material in which the filler is oriented along the axial direction.
[0036] The macro-morphology and micro-morphology of the thermal interface material prepared in this example are as in Example 1, that is, the filler is evenly distributed in the polymer material matrix. The sheets of the filler are closely connected, showing a more obvious feature of being arranged along th...
Embodiment 3
[0039] First mix 100g of methyl vinyl silicone rubber and 1g of curing agent (2,4-dichlorobenzoyl peroxide) in a kneader, then add 200g of flake boron nitride powder and mix for 2 hours. The mixture is taken out, and the mixture is repeatedly extruded 10 times with a double-roll mill, etc., with a gap of 0.5mm between the two rollers; and the mixture is extruded into a thin sheet with a thickness less than 0.5mm. The extruded flake mixture is laminated and further pressed into blocks. The block is sliced in the vertical direction; the cut sheet is heated, pressurized, solidified and molded to obtain a composite heat-conducting material in which the filler is oriented along the axial direction.
[0040] The macro-morphology and micro-morphology of the thermal interface material prepared in this example are as in Example 1, that is, the filler is evenly distributed in the polymer material matrix. The sheets of the filler are closely connected, showing a more obvious feature o...
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Abstract
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