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A method for preparing high heat dissipation polymer material by using hyperbranched polyethylene as an auxiliary 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 fewer defects, simple methods, and mild preparation conditions

Active Publication Date: 2022-03-18
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for preparing high heat dissipation polymer material by using hyperbranched polyethylene as an auxiliary ball milling method
  • A method for preparing high heat dissipation polymer material by using hyperbranched polyethylene as an auxiliary ball milling method
  • A method for preparing high heat dissipation polymer material by using hyperbranched polyethylene as an auxiliary ball milling method

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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 Sigma Aldrich Company of the United States, the specification is 99.5%, and other examples and comparisons, for example, have no special instructions, and this natural graphite is also used).

[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 i...

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Abstract

The invention discloses a method for preparing a heat-dissipating polymer material by ball milling with hyperbranched polyethylene as an auxiliary agent, comprising the following steps: (1) mixing a certain amount of natural graphite and hyperbranched polyethylene in a certain organic solvent, After fully mixing, the solvent is removed to form the first mixture; (2) the first mixture is mixed with high-density polyethylene and then put into a ball milling tank to form the second mixture, and ball milling is carried out. During the ball milling process, the hyperbranched polyethylene Under the assistance of natural graphite, the natural graphite is exfoliated into oligolayer graphene and adheres to the surface of high-density polyethylene to obtain a ball-milled product; the high-density polyethylene is granular, surface-porous high-density polyethylene; (3) The ball-milled product is taken out, and hot-pressed into a sheet to obtain a heat-dissipating polymer material. The method of the invention is simple, easy to operate, low in price, mild in preparation conditions, friendly to the environment, and can efficiently and continuously produce high heat dissipation polymer materials in large quantities.

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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Patent Type & Authority Patents(China)
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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