A preparation method of a toughened thermally conductive insulating cyanate resin-based composite material

Abstract

The invention discloses a preparation method of a toughened and heat-conductive insulating cyanate ester resin based composite. The method comprises the following steps: (1) carrying out surface modification on hexagonal boron nitride; (2) preparing an environment-friendly acrylate core-shell toughening agent emulsion; (3) preparing composite particles; and (4) preparing the toughened and heat-conductive insulating cyanate ester resin based composite, namely a boron nitride emulsion treated by using a silane coupling agent is prepared by using a hydrothermal synthesis method, and the compositeparticles are prepared by using a freeze-drying technology. According to the preparation method, the heat conductivity of a cyanate ester composite which can be obtained by adding a small amount of composite particles into a resin matrix is increased, and meanwhile, the excellent mechanical performance of a thermosetting material is kept, so that unexpected toughened and heat-conductive effects are achieved.

Description

technical field [0001] The invention relates to a preparation method of a toughened thermally conductive and insulating cyanate ester resin-based composite material, specifically the preparation of a core-shell structure acrylate polymer, the modification of hexagonal boron nitride, and the cyanate / core-shell toughening agent / Preparation method of boron nitride composite material. It belongs to the field of thermosetting resin modification. Background technique [0002] In recent years, with the rapid development of electronic technology, electronic products are becoming more and more high-frequency and functional, and the requirements for electronic sealing materials are getting higher and higher. Meet the high heat conduction requirements of the rapidly developing modern electronic products. Therefore, it is necessary to develop high thermal conductivity and insulating polymer matrix composites to meet the needs of industry development. Cyanate ester resin has excellen...

AI Technical Summary

Problems solved by technology

In addition, with the increase of BN addition, the thermal conductivity of the composite increases, but the tensile strength decreases

The resin matrix is ​​filled with modified boron nitride filler to improve its thermal conductivity. Although the thermal conductivity of the resin is improved to a certain extent, the comprehensive mechanical properties of the composite material are greatly reduced, which affects its application range.

[0004] At present, the thermal conductivity or toughening of the polymer material matrix is ​​studied separately, such as CN 105884982A applied by this group, the thermal conductive filler uses boron nitride, but as the addition of boron nitride increases, its mechanical properties decrease too much, Can not meet the requirements for the use of engineering plastics

However, the patent CN 104448112A studies the toughening of thermoplastic resins. The core-shell particles prepared by the selected monomers and emulsifiers have a high degree of crosslinking and are not suitable for thermosetting resins.

The surface of boron nitride can be modified with fewer groups, high surface activity, easy agglomeration, and poor compatibility with the matrix. If it is directly added to the matrix without modification, it will have the defects of uneven dispersion and poor compatibility with the matrix. resulting in a lesser increase in thermal conductivity

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