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A kind of thermoplastic heat-conducting composite material and preparation method thereof

A thermally conductive composite material and a technology for the composite material, applied in the field of thermoplastic thermally conductive composite materials and their preparation, can solve the problems of complex preparation method, electronic restraint, unsuitable for enlarged production, etc., and achieve the effects of simple preparation method and low cost of raw materials

Active Publication Date: 2021-09-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2. Inorganic materials, such as alumina, boron nitride, silicon dioxide, aluminum nitride, etc., most of these materials have a regular crystal structure, internal electrons are bound, and have outstanding heat resistance, insulation and thermal conductivity, but most Inorganic materials are hard and brittle, and molded products have low toughness and are sensitive to defects. They are generally used in fields that do not require high strength
However, the composite material needs to be chemically modified with cationic polyacrylamide or cationic polystyrene, the preparation method is complicated, the cost of raw materials is increased, and it is not suitable for large-scale production

Method used

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  • A kind of thermoplastic heat-conducting composite material and preparation method thereof
  • A kind of thermoplastic heat-conducting composite material and preparation method thereof
  • A kind of thermoplastic heat-conducting composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1. Preparation of polycarbonate / boron nitride thermally conductive composite material PCBN10-MD

[0034] Prepared using the following two-step dilution method:

[0035] (1) The first step of dilution: preparation of PC / BN masterbatch

[0036] Firstly, polycarbonate (PC) was dried at 60° C. for 10 h. Then add a part of PC and hexagonal boron nitride (h-BN) into a high-speed mixer for pre-mixing, and control the mass ratio of PC to h-BN to be 50:50. Extrude the pre-mixed raw materials through a twin-screw extruder at a temperature of 280°C and a screw speed of 40r / min to form strips, then granulate them with a granulator and dry them to obtain h-BN A PC / BN masterbatch with a content of 50 wt%.

[0037] (2) The second step of dilution: preparation of PCBN10-MD

[0038]Add the PC / BN masterbatch with h-BN content of 50wt% and another part of PC into a high-speed mixer for pre-mixing, and control the amount of PC added so that the h-BN content accounts for 10wt% o...

Embodiment 2

[0039] Example 2. Preparation of polycarbonate / boron nitride thermally conductive composite material PCBN20-MD

[0040] Using the same preparation method as in Example 1, the only difference is that in step (2), the amount of PC added is controlled so that the h-BN content accounts for 20wt% of all raw materials to obtain polycarbonate / boron nitride thermally conductive composite material PCBN20- MD.

Embodiment 3

[0041] Example 3. Preparation of polycarbonate / boron nitride thermally conductive composite material PCBN30-MD

[0042] Using the same preparation method as in Example 1, the only difference is that in step (2), the amount of PC added is controlled so that the h-BN content accounts for 30wt% of all raw materials to obtain polycarbonate / boron nitride thermally conductive composite material PCBN30- MD.

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Abstract

The invention discloses a thermoplastic heat-conducting composite material and a preparation method thereof. The thermoplastic heat-conducting composite material of the present invention is a composite material prepared from a heat-conducting masterbatch and thermoplastics, and the heat-conducting masterbatch is prepared from thermoplastics and heat-conducting fillers. Compared with the polycarbonate / boron nitride thermally conductive composite material prepared by the traditional one-step method, the polycarbonate / boron nitride thermally conductive composite material of the present invention has higher thermal conductivity, higher tensile strength, and simultaneously has With excellent thermal stability and excellent comprehensive performance, it has broad application prospects in the fields of electronic appliances, new energy vehicles, heating engineering, heat exchange engineering, and aerospace.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a thermoplastic heat-conducting composite material and a preparation method thereof. Background technique [0002] With the rapid development of electronic information science and technology and high-density assembly technology of printed circuit boards, the volume of electronic components and electronic circuits is constantly shrinking, while the power density and performance are constantly improving, resulting in the heat generated by electronic equipment. to accumulate. If the accumulated heat cannot be dissipated quickly, the working efficiency of the equipment will be restricted and the service life will be shortened. Therefore, in order to ensure the working efficiency and service life of electronic equipment, it is necessary to use high thermal conductivity materials that can quickly dissipate heat. [0003] Traditional heat-conducting materials can be divi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L69/00C08K3/38B29B9/06
CPCB29B9/06C08K3/38C08K2003/385C08K2201/005C09K5/14C08L69/00
Inventor 周生态石优邹华维陈洋刘鹏波梁梅
Owner SICHUAN UNIV