Method for preparing high-heat-conductivity boron nitride reinforced polymer based composite material

A composite material and polymer technology, which is applied in the field of preparation of high thermal conductivity boron nitride reinforced polymer matrix composite materials, can solve the problems of complex process, long cycle time, poor uniform dispersion of polymers, etc., and achieve excellent thermal conductivity, molding Low shrinkage and excellent heat resistance

Active Publication Date: 2017-02-01
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing boron nitride-reinforced polymer-based composite materials with suitable interfacial bonding strength and excellent thermal performance, so as to solve the problems of complex existing processes, long cycle time and low thermal conductivity of the obtained composite materials. , and aims to broaden the application range of composite materials, improve the thermal and mechanical properties of materials, and solve the problems of poor alignment of boron nitride and poor uniform dispersion of polymers in existing boron nitride / polymer composite materials.

Method used

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  • Method for preparing high-heat-conductivity boron nitride reinforced polymer based composite material
  • Method for preparing high-heat-conductivity boron nitride reinforced polymer based composite material
  • Method for preparing high-heat-conductivity boron nitride reinforced polymer based composite material

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preparation example Construction

[0065] The preparation method of composite material of the present invention comprises the following steps:

[0066] a) under the action of a double-center mixing and dispersing machine, mixing layered hexagonal boron nitride powder and polymer powder, so that the polymer powder evenly adheres to the surface of the boron nitride powder to obtain a mixture;

[0067] b) Vibrating the mixture obtained in step a) on a rotary vibrating table, so that the lamellar boron nitride powder realizes the preferential arrangement of the lamellar direction;

[0068] c) vacuum hot pressing the mixture subjected to step b) transverse vibration to obtain the composite material.

[0069] In another preferred example, the polymer is polyethylene, polypropylene, nylon, polyimide, polyphenylene sulfide.

[0070] In another preferred example, the mixing is carried out under the action of a double-center mixing and dispersing machine. The mixing speed is 1000-2000 rpm, and the mixing time is 30-120...

Embodiment 1

[0100] Example 1 Preparation of Boron Nitride Reinforced Polymer Matrix Composite Material 1

[0101] A: Measure the following components according to the following volume ratio:

[0102] Boron nitride powder 40vol%

[0103] Polyethylene powder 60vol%

[0104] B: After mixing the powder, put it into a double-center mixing and dispersing machine and stir for 30s, and the rotation speed is controlled at 1200rpm. The obtained mixture was put into a precision pressing mold, and after being uniformly vibrated on a rotary vibration table for 30 minutes, the rotational speed of the lateral vibration was 162 rpm.

[0105] C: After assembling the sample in step B with a mold, put it into a vacuum hot-press furnace, evacuate until the vacuum degree is below 200Pa, heat up to 150°C at a heating rate of 8°C / min, and perform hot pressing. The pressure is 20MPa, keep the pressure for 20min, then cool to room temperature with the furnace.

[0106] The high-temperature treated sample was ...

Embodiment 2

[0109] Example 2 Preparation of Boron Nitride Reinforced Polymer Matrix Composite Material 2

[0110] Same as Example 1, the difference is: the volume fraction of boron nitride powder is 30vol.%.

[0111] The measured thermal conductivity of the sample (whichever is the highest) is 8.78W / m.K, and the flexural strength is 32MPa.

[0112] The density is 1.345g / cm 3 , the thermal diffusivity in the vertical direction is 4.049mm 2 / s, the thermal diffusivity in the parallel direction is 1.707mm 2 / s.

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Abstract

The invention relates to a method for preparing a boron nitride reinforced polymer based composite material. The method comprises the steps of mixing laminar hexagonal boron nitride powder and polymer powder so as to obtain a mixture, then, vibrating the mixture on a rotary type vibrating table, and then, carrying out vacuum hot-pressing, thereby obtaining the boron nitride reinforced polymer based composite material. The composite material prepared by the method provided by the invention has the advantages that the heat conductivity is high, the mechanical properties are good, the preparation method is simple, the controllability is high, the forming time is short, and long-time curing is not required.

Description

technical field [0001] The invention belongs to the field of engineering polymer composite materials. Specifically, it relates to a preparation method of boron nitride reinforced polymer matrix composite material with high thermal conductivity. Background technique [0002] With the rapid development of the electronic technology industry, more and more heat is dissipated per unit area, and the miniaturization of equipment reduces the effective heat dissipation area, which puts forward stricter requirements on the performance of thermal management materials. The development of electronic packaging materials and thermal conductivity are an important part, requiring materials with high thermal conductivity, low expansion coefficient, light weight, and low cost. [0003] Polymer-based composite materials have the advantages of light weight, low price, and convenient processing in this respect. However, due to the low thermal conductivity of the polymer itself, the heat dissipa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L77/06C08L79/08C08L81/02C08L23/12C08K7/00C08K3/38C09K5/14B29C43/56B29C43/32
CPCB29C43/32B29C43/56B29C2043/561C08K3/38C08K7/00C08K2003/385C08L2201/08C09K5/14C08L23/06C08L77/06C08L79/08C08L81/02C08L23/12
Inventor 马洪兵江南白华薛晨李进卢威褚伍波
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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