JPS59178249A - Thermal conductive material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermally conductive material having both insulating and thermally conductive properties.

Conventional silicon/rubber kneaded with boron nitride, polyethylene, ethylene-vinyl acetate copolymer (EVA)
Materials made by filling thermoplastic polymers such as aluminum oxide and aluminum hydroxide with aluminum oxide and aluminum hydroxide are used as composite materials that have both insulation and thermal conductivity. Since a large amount of fillers such as aluminum and aluminum hydroxide are contained in the matrix, there is a problem in that mechanical properties such as tensile strength and elongation are extremely reduced.

An object of the present invention is to provide a thermally conductive material that eliminates the drawbacks of the conventional thermally conductive materials and has improved mechanical properties.

The advantage of the present invention is that the copolymer of ethylene and vinyl acetate (EV
A) and a thermoplastic nidistomer as a matrix, aluminum oxide and/or aluminum hydroxide as a filler, and peroxide as a crosslinking agent.The matrix used in the thermally conductive material according to the present invention is flexible and water as the matrix (A). .

For example, ethylene-vinyl acetate copolymer (with a vinyl acetate content of 45% by weight or less) has excellent properties against ultraviolet rays.
EVA) and matrix ω) are thermoplastic nidistomers (elastic polymeric substances) such as natural rubber, synthetic rubber, and polyisobutylene, and these matrices (A) and ω) are used, and aluminum oxide (k-etos) is added to these matrices as a filler. or aluminum hydroxide (A-
#(OH)s) or a mixture of both,
A polyethylene peroxide such as dicumyl peroxide is used as a crosslinking agent, and an antioxidant such as tetrakis[methylene-6-(3',
A polymeric phenol-based hindered phenolic antioxidant such as 5'-tertiary phthyl-4'-hydroxyphenyl) propionate comethane is added as the main ingredient for all of the above,
This is kneaded using a pressure kneader or the like at a pressure of 51 kg/CrI temperature of about 10 DC, and when the kneaded product is molded into a notebook shape or any other shape using a calender, etc., glass fibers and carbon fibers are added as reinforcement.

A thermally conductive material is manufactured by forming the heat conductive material into one piece using a cross-like fabric such as alumina fiber and a backing means such as a polyester non-woven fabric.

Next, regarding the blending ratio of the above-mentioned composite thermally conductive material, if the blending amount of matrix +A) and (+3) is less than 20 inches (weight), sufficient kneading cannot be obtained;
The thermal conductivity decreases when the temperature exceeds 20
~50% (by weight) blending is preferred. Also, the matrix (
The ratio of A) to matrix (B) is preferably 1:1 to 4. If the amount of filler is less than 50% (by weight), the thermal conductivity will decrease, and if it exceeds 80% (by weight), kneading and molding will be insufficient, so it is preferably 50 to 80% (by weight). If the amount of peroxide as a crosslinking agent exceeds 0.54 (weight), the matrix will decompose, so it is preferably 0 to 0.5% (weight). Since the effect of the crosslinking agent decreases, the weight is preferably 0 to 1.0 g6 (weight is preferable).

Characteristic lines of the cross-like woven fabric such as glass fiber, carbon fiber, alumina fiber, etc. or polyester non-woven fabric used as the above-mentioned reinforcing material Any material that satisfies the insulation, thermal conductivity, and mechanical properties that are the objectives of the present invention. Any commercially available fibers having a thickness of, for example, 0.1 to 0.02 m5+ may be used.

Next, examples of sheets of the present invention will be described.

〔Example〕

Samples of the thermally conductive material according to the present invention and a conventional product as a comparative example having the compositions (wt%) shown in Table 1 below were placed in a pressure kneader (Moriyama Manufacturing Co., Ltd.) under pressure conditions of 5 #/ d Heating to a temperature of 100C and kneading under pressure for about 15 minutes, the mixed wire product and the reinforcing material shown in Table 1 were further used to create a sort with a thickness of 0.3 fl using a calender, and then each sheet was The characteristic values were measured and the characteristic values shown in Table 2 were obtained.

24C Table 2 Characteristics values Matrix as a production material as shown in Table 2.

Filler) 7! The product of the present invention, which is made by kneading oxides and antioxidants and lining the sheet material with a cloth made of carbon fiber, glass fiber, alumina fiber, or polyester nonwoven fabric as a reinforcing material, has excellent mechanical properties such as tensile strength and elongation. It is clear that the properties are significantly improved compared to conventional products.

The thermally conductive material according to the present invention can improve mechanical properties and is extremely useful, for example, as a heat dissipation material for electronic and electrical components. It is a thermally conductive material.

Agent: Patent Attorney Sanro Kimura

Claims (1)

[Scope of Claims] 1) A copolymer of ethylene and vinyl acetate and a hot JW nidistomer as a matrix and aluminum oxide and/or aluminum hydroxide as a filler. A thermally conductive material made of a material made of peroxide and antioxidant as a crosslinking agent and a reinforcing material made of fibers. 2) The matrix has a weight of 20 to 50 inches. Filler is 50-80% (by weight, peroxide is O-0.5
% (weight), the antioxidant is 0 to 14 weight), and the Ivf characteristic is that the material is provided with a reinforcing finish. 6) The thermally conductive material according to claim 1, wherein the reinforcing material is a cloth-like fabric such as glass fiber, carbon fiber, or alumina fiber, or a polyester nonwoven fabric.