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Preparation method of high-thermal-conductivity polyethylene composite material

A composite material and polyethylene technology, which is applied in the field of polymer heat-conducting composite material preparation, can solve the problems of mechanical property decline, cost increase, processing performance deterioration, etc., and achieve the effect of simple preparation process and increased effective concentration

Active Publication Date: 2020-05-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in conventional heat-conducting composite materials, the heat-conducting particles are randomly distributed in the polymer matrix, so a high filler content (volume content > 30%) is often required to form an interconnected heat-conducting network, but high-content heat-conducting fillers bring about increased costs and poor mechanical properties. Problems such as drop and processability deterioration

Method used

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  • Preparation method of high-thermal-conductivity polyethylene composite material
  • Preparation method of high-thermal-conductivity polyethylene composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The mass percentages of the main raw materials are as follows: LDPE 9%; BNNS 10%; UHMWPE 81%.

[0023] The operation steps adopt:

[0024] (1) Preparation of the BNNS-LDPE / UHMWPE mixture: first add LDPE to the rotary rheometer to melt, then add BNNS and UHMWPE and continue mixing for 10 minutes to obtain a BNNS-LDPE / UHMWPE mixture. The mixing temperature, rate and time are 180, respectively. ℃, 100r / min and 10min;

[0025] (2) Compression molding: preheat the BNNS-LDPE / UHMWPE mixture in step (1) at 200° C. for 10 minutes, then hot press at 100 MPa for 10 minutes, and finally cool to room temperature to obtain the target flake product.

Embodiment 2

[0027] Others are the same as in Example 1, the raw material ratio is LDPE 36%; BNNS 10%; UHMWPE 54%;

Embodiment 3

[0029] Others are the same as in Example 1. The raw material ratio is LDPE 90%; BNNS 10%; UHMWPE 0%.

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Abstract

The invention relates to a preparation method of a high-thermal-conductivity polyethylene composite material. The composite material comprises the following raw materials in percentage by mass: 9 to 90% of low-density polyethylene (LDPE), 10% of boron nitride nanosheets (BNNS) and 0 to 81% of ultra-high-molecular-weight polyethylene (UHMWPE). The preparation method comprises the following steps: (1) preparation of a BNNS-LDPE / UHMWPE mixture; and (2) compression molding. According to the invention, the BNNS with high thermal conductivity is used as a thermal conductive filler, the LDPE is takenas a matrix, UHMWPE particles are added, so a BNNS-LDPE continuous phase is selectively distributed on an interface of the UHMWPE, an efficient three-dimensional heat conduction network is constructed under the condition of low BNNS content, and the composite material with high heat conductivity is obtained. The high-thermal-conductivity polyethylene composite material is simple in preparation process, low in production cost and easy to realize large-scale industrial production.

Description

Technical field [0001] The invention relates to the field of preparation of polymer thermally conductive composite materials, in particular to boron nitride nanosheets (hereinafter referred to as BNNS)-low density polyethylene (hereinafter referred to as LDPE) / ultra-high molecular weight polyethylene (hereinafter referred to as UHMWPE) high thermal conductivity polyethylene composite materials The preparation method. Background technique [0002] With the rapid growth of my country's economy and the increasing demand for power, the transmission capacity of power equipment is getting larger and larger, which requires higher and higher insulation and thermal conductivity of transmission equipment. However, the insulation materials of most power equipment have poor thermal conductivity. During long-term operation, the continuous accumulation of heat will cause the equipment performance to decline, shorten the life span, and even cause accidents. Therefore, the development of high t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K7/00C08K3/38C09K5/14B29B7/00B29C43/02
CPCB29B7/002B29C43/02C08K2003/385C08K2201/011C08L23/06C08L2205/025C08L2207/066C08L2207/068C09K5/14C08K7/00C08K3/38
Inventor 贾利川廖常君王国利任俊文赵莉华傅明利王婷婷
Owner SICHUAN UNIV