Method for modifying surface of BN (boron nitride) powder, modified BN and polymer composite material
A composite material and boron nitride powder technology, which is applied in the field of composite material preparation technology, can solve the problem of large interface thermal resistance between BN and polymer matrix, and achieve the effects of insulation, high thermal conductivity, machinability, easy realization, and easy availability of raw materials
Inactive Publication Date: 2014-04-02
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Problems solved by technology
[0005] The purpose of the present invention is to modify the surface of the most common BN powder through a simple and easy surface modification method to improve its compatibility with the polymer matrix and solve the problem of large thermal resistance at the interface between BN and the polymer matrix. problems, and provide a simple, green, non-toxic and non-polluting preparation method for high thermal conductivity insulating polymer matrix composites
Method used
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Effect test
Embodiment 1
[0031] Add 20g of BN into 200ml of 0.1M ammonium persulfate solution, stir for 1h, transfer the mixture into a closed reaction kettle, heat to 100°C, stir for 48h, cool, wash and filter, and dry in an oven for 24h to obtain the modified nitriding New functional groups appear in boron powder, such as figure 1 , and dispersed uniformly in the polymer matrix.
Embodiment 2
[0033] Add 40g of BN to 600ml of 30% hydrogen peroxide, stir for 2 hours, transfer the mixture into a closed reaction kettle, heat to 120°C, stir for 24 hours, cool, wash and filter, then dry in an oven for 48 hours to obtain the modified boron nitride New functional groups appear in the powder, and they are uniformly dispersed in the polymer matrix.
Embodiment 3
[0035] Add 100g of BN into 4600ml of 30% hydrogen peroxide, stir for 2 hours, transfer the mixture into a closed reaction kettle, heat to 140°C, stir for 48 hours, cool, wash and filter, then dry in an oven for 48 hours to obtain the modified boron nitride New functional groups appear in the powder, and they are uniformly dispersed in the polymer matrix.
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Abstract
The invention relates to a method for modifying the surface of BN (boron nitride) powder, modified BN and a polymer composite material. The BN nano powder serves as a raw material, a strong oxidizer serves as a modifier, and a hydrothermal preparation process is adopted to modify the surface of BN to prepare the modified BN. The raw material is simple, available, and low in cost; the preparation process is simple, harmless and environment-friendly; the modified BN is uniformly dispersed in a polymer base, the compatibility of the modified BN with the polymer base is greatly improved, the problem that the thermal resistance of the BN with the interface of the polymer base is solved, and the thermal conductivity of the polymer is greatly improved; and the composite material has both high insulativity, high thermal conductivity and good machinability.
Description
technical field [0001] The invention relates to a simple and easy method for modifying boron nitride and its preparation process with polymer composite materials, which belongs to the field of polymer-based composite materials. The method for modifying boron nitride is simple and efficient, and its compounding with polymer The process cost is low, green and environment-friendly, and it is a composite material preparation process suitable for large-scale production. Background technique [0002] With the rapid development of microelectronics high-density assembly and integration technology, the assembly density of electronic equipment has been rapidly increased, which will lead to a sharp increase in the heat generated per unit area, resulting in a significant reduction in the working efficiency and service life of electronic components. In order to ensure the normal operation of electronic equipment, excess heat must be removed in a timely manner. Therefore, heat dissipatio...
Claims
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IPC IPC(8): C08L79/08
Inventor 黄晓张国军谢滨欢
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI