Method for improving thermal conductivity of flaky aluminum oxide/polymer composite sheet induced by electric field
A flaky alumina, electric field induction technology, applied in the field of composite materials, insulation and heat dissipation substrates, can solve problems affecting thermal conductivity and other problems, and achieve the effect of improving thermal conductivity
Inactive Publication Date: 2021-08-20
BAISE UNIV
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Problems solved by technology
[0005] Aiming at the problem that the random orientation of flake alumina in the flake alumina / polymer composite sheet affects the thermal conductivity, an electric field is provided to induce the orientation dispersion of flake alumina, thereby improving the thermal conductivity of the flake alumina / polymer composite sheet coefficient method
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specific Embodiment approach 2
[0028] (1) Add 70 grams of granular silicone-modified phenolic resin (including about 3 grams of solid amine curing agent) and 20 grams of epoxy resin to the mixer, with an average particle size of D 50 910 grams of flaky α-alumina of 20 microns, mixed evenly;
[0029] (2) Put the homogeneous mixture of silicone-modified phenolic resin, epoxy resin and flaky alumina into the twin-screw mixing, plasticizing and granulating integrated machine, knead and plasticize at 110°C for 4 hours, and granulate to obtain half Cured flaky alumina / polymer composite particles;
[0030] (3) The composite particles are added to an electric field induction injection molding machine for injection molding, and the distance between the mold cavities is controlled to be 100 microns. Turn on the AC power supply, adjust the electric field intensity to 8kV / mm, the flaky alumina in the molten composite material will be polarized, and the rotational orientation will occur due to the negative charge. Aft...
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Abstract
The invention discloses a method for inducing flaky aluminum oxide in a polymer composite material by an electric field. The flaky aluminum oxide is oriented and dispersed in a direction parallel to an induced electric field, namely, the flaky aluminum oxide is oriented and dispersed in a direction vertical to the surface of a sheet, so that the thermal conductivity of the flaky aluminum oxide / polymer composite sheet in the vertical direction is improved; the thickness of the sheet layer of the flaky aluminum oxide is nanoscale, and the surface of the sheet layer is micron-scale; the flake aluminum oxide is polarized by an electric field to form an electric dipole moment, and the dipole moment causes a torsional moment to the flake aluminum oxide. According to the method for orientating and dispersing the flaky aluminum oxide in the polymer based on electric field induction, the obtained composite sheet has anisotropy in the aspects of electrical performance, optical performance, mechanical performance and thermal performance, and is particularly suitable for improving the thermal conductivity perpendicular to the sheet surface direction, so that the application prospect in the field of copper-clad laminated boards is wide.
Description
technical field [0001] The invention relates to the fields of composite materials, insulating and heat-dissipating substrates, and in particular to a preparation method of an insulating heat-conducting composite sheet. Background technique [0002] The composite sheet based on thermally conductive particles and polymers has unique advantages in terms of thermal conductivity, flexibility, insulation, bonding force and processing temperature, and is an ideal insulation layer for aluminum-based copper-clad laminates (referred to as aluminum substrates). choose. Although the thermal conductivity of polymer composite sheets added with α-alumina, aluminum nitride, boron nitride, silicon carbide and other heat-conducting particles can be increased to 1-3W / (m•K), with the gradual development of electronic packaging technology With the development in the direction of miniaturization, high density, multi-function and high reliability, the power density increases accordingly, and the ...
Claims
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IPC IPC(8): C08J3/00C08L61/06C08L61/14C08L63/00C08K7/00
CPCC08J3/00C08J2361/06C08K7/00C08J2361/14C08J2463/00
Inventor 陈振兴卿培林王玺徐敬尧刘建韦修恺黎成武陈柳伊卢东宁
Owner BAISE UNIV