Preparation method of environment-friendly and flame-retardant composite hexagonal boron nitride film

Abstract

The invention provides a preparation method of an environment-friendly and flame-retardant composite hexagonal boron nitride film. The preparation method comprises the following steps: selecting and uniformly mixing hexagonal boron nitride particles with different grain sizes, adding a silane coupling agent, obtaining mixed hexagonal boron nitride power, then adding dimethicone, hydroxide composite powder, fumed silica gel and superoxide in the mixed hexagonal boron nitride power in sequence, obtaining a hexagonal boron nitride film semi-finished product, putting the hexagonal boron nitride film finished product into vulcanizing equipment for vacuumizing, pressurizing and shaping, and obtaining an environment-friendly and flame-retardant composite hexagonal boron nitride film finished product. The film prepared by the preparation method integrates high heat conductivity coefficient of hexagonal boron nitride and excellent flame retardancy of the hydroxide composite powder and simultaneously has the functions of environmental friendliness and no electric conduction, and the flame retardant rating is the highest in UL94 standard. The preparation method has the advantages of wide adaptability, simple operation process, major innovation value and practical application prospect.

Description

technical field [0001] The invention relates to an environment-friendly flame-retardant composite hexagonal boron nitride film technology, in particular to a method for preparing a solid hexagonal boron nitride film with a thermal conductivity as high as 10W / M-K obtained after silane treatment. [0002] Background technique [0003] Entering the 21st century, with the rapid development of electronic information products and technologies, the demand for organic materials with high thermal conductivity, electrical insulation and environmental protection and flame retardancy has surged. Faced with this demand, people have successively developed products such as ceramic sheets and alumina-filled silica gel gaskets, but there are several problems in existing such products. [0004] Although ceramic sheets have both high thermal conductivity and electrical insulation, but because of their hard texture, deformation and compression ratio are almost zero, the manufacturing process i...

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Problems solved by technology

[0004] Although ceramic sheets have both high thermal conductivity and electrical insulation, but because of their hard texture, deformation and compression ratio are almost zero, the manufacturing process is very inconvenient, cannot meet the actual consumption needs, and has a certain degree of pollution to the environment; oxidation Although the aluminum-filled silicone gasket has the advantages that ceramic sheets do not have, its thermal conductivity can only hover within 3.0W / M-K, and its flame retardancy level is very low, which cannot meet the actual use requirements