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A method for preparing graphene by using hyperbranched polyethylene as an auxiliary ball milling method

A technology of hyperbranched polyethylene and ball milling, which is applied in the direction of graphene, chemical instruments and methods, carbon compounds, etc., can solve the problems of low electrical conductivity and limit the application of graphene, and achieve simple methods, easy operation, and mild preparation conditions Effect

Active Publication Date: 2022-02-11
ZHEJIANG UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is low electrical conductivity, which greatly limits the application of graphene prepared by this method.

Method used

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  • A method for preparing graphene by using hyperbranched polyethylene as an auxiliary ball milling method
  • A method for preparing graphene by using hyperbranched polyethylene as an auxiliary ball milling method
  • A method for preparing graphene by using hyperbranched polyethylene as an auxiliary ball milling method

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Comparison scheme
Effect test

Embodiment 0

[0067] Embodiment 0: prepare hyperbranched polyethylene (HBPE)

[0068] In this embodiment, hyperbranched polyethylene can be obtained by using Pd-diimine catalyst to catalyze ethylene, and obtain it by a one-step "chain removal" copolymerization mechanism. The specific preparation process includes the following steps:

[0069] 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 25 ° C. Pd-diimine catalyst in anhydrous grade solvent, stirred and reacted for 24 hours at a temperature of 25°C and an ethylene pressure of 0.1 MPa. After the polymerization was completed, the resulting product was poured into acidified methanol to terminate the polymerization. The obtained polymerization reaction mixture was separated and purified. Obtain hyperbra...

Embodiment 1

[0075] Embodiment 1, Comparative Examples 1 and 2

[0076] 1. Preparation of samples

[0077] (1) embodiment 1: provide a kind of method that prepares graphene with hyperbranched polyethylene as auxiliary ball milling method, it prepares according to the following steps:

[0078] 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).

[0079] Step 2: Weigh 0.416g of hyperbranched polyethylene and dissolve it in 15ml of chloroform.

[0080] Step 3: mix the HBPE solution and natural graphite, put them in a beaker, and add 35ml of chloroform to obtain a mixed solution of natural graphite and HBPE.

[0081] Step 4: Stir the mixture of natural graphite and HBPE, the stirring speed is 300rad / min, and the stirring time is 30min.

[0082] Step 5: Use a blower to remove the solvent in the m...

Embodiment 1、 comparative example 6、 comparative example 7

[0126] 1. Preparation of samples

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Abstract

The invention discloses a method for preparing graphene by ball milling method using hyperbranched polyethylene as an auxiliary agent, which comprises the following steps: (1) mixing a certain amount of natural graphite and hyperbranched polyethylene in a certain organic solvent, fully mixing After being uniform, 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 mill tank to form the second mixture, and ball milling is carried out. During the ball milling process, the hyperbranched polyethylene is assisted Next, 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) ball milling The product is dispersed in an organic solvent, and the high-density polyethylene is removed from the ball-milled product to obtain a graphene dispersion. The method of the invention is simple, easy to operate, low in price, mild in preparation conditions, friendly to the environment and capable of high-efficiency and continuous mass production of graphene.

Description

technical field [0001] The present application relates to the field of graphene preparation, in particular to a method for preparing graphene with hyperbranched polyethylene as an auxiliary agent. Background technique [0002] At present, thermal conductive composite materials are widely used in electronic information, automobiles, heat exchangers, and aerospace equipment. At present, electronic and electrical products are expanding in the direction of small size, light weight, high integration and high power. Therefore, the performance requirements for thermally conductive materials are also rising. In the past, metal materials, such as metals and metal oxides, were usually used, but the use of metal materials has a big disadvantage. Metal materials have poor corrosion resistance, so the application range of metal heat dissipation materials is greatly limited. In recent years, thermally conductive polymers have become more and more widely used because of their stable chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
CPCC01B32/19C01B2204/30
Inventor 徐立新张博远叶会见王彦博
Owner ZHEJIANG UNIV OF TECH
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