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Nano SiO2 coated BN composite powder, preparation method thereof and thermal conductive material

A composite powder and coating technology, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of limited improvement of thermal conductivity of thermally conductive functional materials, affecting the thermal conductivity of boron nitride, and limited improvement of compatibility. To achieve excellent thermal conductivity, promote the cost of preparation, and the effect of rapid heat conduction

Active Publication Date: 2020-08-14
EASTERN LIAONING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the photo of its finished product, SiO 2 The coating layer is thick, and the coating layer is uneven, and there is free SiO with a large particle size 2 Nucleating particles lead to limited compatibility improvement and greatly limit the addition ratio; in addition, the thickness of the coating layer is too thick, and there are large particles of free SiO 2 The isolation effect of nucleation particle attachment greatly affects the thermal conductivity of boron nitride, and the thermal conductivity after addition is not ideal
[0005] As mentioned above, the filling ratio of boron nitride modified by the coating method is extremely limited, and it is generally difficult to exceed 20%, which leads to a very limited improvement in the thermal conductivity of the obtained thermally conductive functional material, and also limits the Exploitation of Boron Nitride Thermal Conductivity

Method used

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  • Nano SiO2 coated BN composite powder, preparation method thereof and thermal conductive material
  • Nano SiO2 coated BN composite powder, preparation method thereof and thermal conductive material
  • Nano SiO2 coated BN composite powder, preparation method thereof and thermal conductive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1). Put 60g of spherical boron nitride into a 2000mL three-necked flask, add 150mL of water, 600mL of absolute ethanol and 0.075g of cetyltrimethylammonium bromide (CTAB), and implement ultrasonic dispersion for 30min;

[0037] (2). Inject 4ml of ammonia water into the three-necked flask and raise the temperature to 40°C;

[0038] (3). Mix anhydrous ethanol and TEOS, and add the mixture dropwise to the three-necked flask three times, each time adding one-third of the total volume of the mixture, after each drop, stir for 1 hour, and then proceed to the next drop Add; continue to react for 10h after the dropwise addition of all the mixed solution is completed;

[0039] The mass ratio of the spherical BN, CTAB, TEOS, water and ETOH is 2:0.0025:1.3:5:27;

[0040] (4). Let the above-mentioned reactants stand for precipitation. After the upper layer appears turbid liquid, tilt the three-necked flask, pour out the upper layer of turbid liquid, and then wash the lower layer wi...

Embodiment 2

[0042] The preparation method is the same as in Example 1, except that no surfactant is added in step ①, and the mass ratio of spherical BN, TEOS, water and ETOH is 2:1.3:5:27; image 3 As shown, the SiO on the surface of spherical BN particles 2 The thickness of the cladding layer is uneven, and there is obvious agglomeration and stacking.

Embodiment 3

[0044] The preparation method is the same as in Example 1, and the mass ratio of spherical BN, CTAB, TEOS, water and ETOH is 2:0.01:1.3:5:27;

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Abstract

The invention provides nano SiO2 coated BN composite powder, a preparation method of the nano SiO2 coated BN composite powder and a thermal conductive material. The nano SiO2 coated BN composite powder is prepared by the following steps of: by taking spherical boron nitride as a modified matrix, dropwise adding a mixed solution of tetraethoxysilane and absolute ethyl alcohol into a mixture of dispersedly mixed spherical BN, absolute ethyl alcohol, a surfactant and water under the condition that the pH value is 8-10, reacting for 6-15 hours under a sealing condition, filtering and drying. As aheat-conducting additive, the maximum addition amount of the obtained heat-conducting material of the heat-conducting epoxy resin and the heat-conducting plastic is 40% of the total mass. The technical scheme has the advantages of larger room for improvement of heat conduction, better thermal conductivity and lower manufacturing cost.

Description

technical field [0001] The invention relates to a new type of nano-coated composite material, in particular to a nano-SiO with high thermal conductivity 2 A composite powder material coated with spherical boron nitride (BN) and a preparation method thereof. Background technique [0002] Boron nitride has a layered structure similar to graphite and has good insulation, high temperature resistance, chemical corrosion resistance and thermal conductivity. Many fields of the existing technology hope to use the thermal conductivity of boron nitride, add it to nylon and other polymer materials to prepare thermally conductive polymer materials, and more are used in electronic components to effectively improve the thermal conductivity of electronic components performance. However, the good lubricity of boron nitride makes its surface inert and has poor compatibility, so it cannot be directly added to polymers or resins, because it is difficult to mix and disperse in polymers or res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/14
CPCC09K5/14
Inventor 邹本雪倪琨刘波李方方刘玉朝刘传华
Owner EASTERN LIAONING UNIV
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