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Method for preparing high-heat-dissipation polymer material by taking hyperbranched polyethylene as additive through ball milling method

A technology of hyperbranched polyethylene and polymer materials, which is applied in the field of preparing high heat dissipation polymer materials, can solve the problems that limit the application of polymer materials, and achieve the effects of less defects, simple methods, and environmental friendliness

Active Publication Date: 2021-06-01
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the application of polymer materials in many aspects is limited to a certain extent.

Method used

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  • Method for preparing high-heat-dissipation polymer material by taking hyperbranched polyethylene as additive through ball milling method
  • Method for preparing high-heat-dissipation polymer material by taking hyperbranched polyethylene as additive through ball milling method
  • Method for preparing high-heat-dissipation polymer material by taking hyperbranched polyethylene as additive through ball milling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 0

[0047] Example 0: Synthesis of HBPE

[0048] In this embodiment, there are many types of hyperbranched polyethylene. Exemplarily, hyperbranched polyethylene can be obtained by using a Pd-diimine catalyst to catalyze ethylene and obtain it by a one-step "chain removal" copolymerization mechanism. The specific preparation process Include the following steps:

[0049] Under the protection of nitrogen, add ethylene gas into the reaction vessel and ensure that there is no oxygen and water in the instrument. At the same time, ensure that the ethylene gas fills the entire reaction vessel. The solvent is anhydrous solvent, and the temperature is controlled at 5 ~ 35 ° C. Then add Pd-diimine catalyst dissolved in anhydrous solvent, stirred and reacted for 6 to 72 hours at a temperature of 5 to 35°C and an ethylene pressure of 0.01 to 0.8 MPa. After the polymerization, pour the obtained product into acidified methanol to terminate the polymerization , the obtained polymerization reacti...

Embodiment 1

[0059] Embodiment 1, comparative example 1, comparative example 2

[0060] 1. Preparation of samples

[0061] (1) Embodiment 1 provides a kind of method with hyperbranched polyethylene as auxiliary agent exfoliating graphene, and it is prepared according to the following steps:

[0062] Step 1: Weigh 5g of natural graphite at normal temperature (the manufacturer is SigmaAldrich Company of the United States, the specification is 99.5%, and other examples and comparisons such as no special instructions also use this natural graphite).

[0063] Step 2: Weigh 0.416g of hyperbranched polyethylene (the mass ratio to graphite is 1:12), and dissolve it in 15ml of chloroform.

[0064] Step 3: Mix the HBPE solution and natural graphite, put it in a beaker, and add 35ml of chloroform

[0065] Step 4: Stir the mixture of natural graphite and HBPE, the stirring speed is 300rad / min, and the stirring time is 30min.

[0066] Step 5: Use a blower to remove the solvent in the mixed solution....

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Abstract

The invention discloses a method for preparing a heat dissipation polymer material by taking hyperbranched polyethylene as an auxiliary agent through a ball milling method, wherein the method comprises the following steps: (1) mixing a certain amount of natural graphite and hyperbranched polyethylene in a certain organic solvent, and removing the solvent after fully and uniformly mixing to form a first mixture; (2) mixing and stirring the first mixture and high-density polyethylene, then putting the mixture into a ball-milling tank to form a second mixture, performing ball-milling treatment, and stripping natural graphite into few-layer graphene and adhering the few-layer graphene to the surface of the high-density polyethylene under the assistance of hyperbranched polyethylene in the ball-milling process to obtain a ball-milled product, wherein the high-density polyethylene is granular high-density polyethylene with a porous surface; and (3) taking out the ball-milled product, and hot-pressing into sheets to obtain the heat dissipation polymer material. The method disclosed by the invention is simple, easy to operate, low in price, mild in preparation condition, environment-friendly and capable of efficiently, continuously and massively producing the high-heat-dissipation polymer material.

Description

technical field [0001] The present application relates to the field of preparation of heat dissipation polymers, in particular to a method for preparing high heat dissipation polymer materials. Background technique [0002] Due to its good corrosion resistance, cheap price, light weight and easy processing and molding, polymer materials have been widely used in the fields of chemical industry, energy, electronic device heat dissipation, electronic information, electrical engineering and aerospace, and have shown a wide range of applications. prospect. [0003] Compared with metal materials, there is still a big gap in the thermal conductivity and electrical conductivity of polymer materials. Therefore, the application of polymer materials in many aspects is limited to a certain extent. However, this problem is effectively solved by adding different high thermal conductivity fillers (such as graphite, nano-graphite flakes, copper powder, carbon nanotubes, etc.) to blend and...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K3/04
CPCC08L23/06C08L2205/02C08L2207/062C08K3/042
Inventor 徐立新张博远叶会见蒋慧蕾胡书杰
Owner ZHEJIANG UNIV OF TECH
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