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Polymer composite material with double network structure and preparation method thereof

A technology of network structure and composite materials, which is applied in the field of network structure polymer composite materials and its preparation, can solve problems such as limited effects, and achieve the effects of low cost, increased electrical conductivity, and improved thermal and electrical conductivity

Active Publication Date: 2017-10-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This phenomenon shows that although this single network structure can improve the thermal conductivity of epoxy resin to a certain extent, the improvement effect is relatively limited.

Method used

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  • Polymer composite material with double network structure and preparation method thereof
  • Polymer composite material with double network structure and preparation method thereof
  • Polymer composite material with double network structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 100 parts of polypropylene (PP) powder, 15 parts of low-temperature expanded graphite (EG) with a flake size of 30-150 μm and 3 parts of multi-walled carbon nanotubes (CNTs) with an average length of 1.5 μm and an outer diameter of 9.5 nm After fully premixed, add it to an internal mixer, and mix for 10 minutes at 190°C and 60 rpm to obtain a polypropylene composite material with a double network structure. After the composite material was molded at 190°C, not only the electrical conductivity and thermal conductivity were tested, the results are shown in Table 1, but also the frozen section was observed with a scanning electron microscope, see figure 2 d, e, f, and TEM observation, see image 3 .

Embodiment 2

[0036] 100 parts of polypropylene (PP) powder, 15 parts of low-temperature expanded graphite (EG) with a flake size of 30-150 μm, and 5 parts of multi-walled carbon nanotubes (CNTs) with an average length of 1.5 μm and an outer diameter of 9.5 nm After fully premixed, add it to an internal mixer, and mix for 10 minutes at 190°C and 60 rpm to obtain a polypropylene composite material with a double network structure. The composite material was molded at 190°C, and the electrical conductivity and thermal conductivity were tested. The results are shown in Table 1.

Embodiment 3

[0038] 100 parts of thermoplastic elastomer polyurethane (TPU) powder, 25 parts of low-temperature expanded graphite (EG) with a flake size of 150-300 μm, and 5 parts of multi-walled carbon nanotubes with an average length of 1.5 μm and an outer diameter of 9.5 nm ( CNTs) were fully premixed and added to the internal mixer, and mixed for 10 minutes under the conditions of 180 ° C and 60 rpm to obtain a polyurethane composite material with a double network structure. The composite material was molded at 180°C, and the electrical conductivity and thermal conductivity performance tests were performed. The results are shown in Table 2.

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Abstract

The invention provides a polymer composite material with a double network structure and a preparation method thereof. The composite material contains filler A and filler B, wherein the size of the filler A is 30-500 μm, and the size of the filler B is 1.0-20 μm. The size ratio of filler A to filler B is at least 20, and the two are evenly distributed in the polymer matrix material and overlap each other to form an interlaced network structure of electrical and thermal conduction paths, and the smaller filler B is distributed in the larger size Filler A forms a loose network structure grid and overlaps each other to form a relatively dense network that runs through it, so that the obtained composite material has a double network structure that is conducive to the movement of electrons and reduces the interface thermal resistance, thereby At the same time, its electrical and thermal conductivity are greatly improved. The method for constructing a double network by utilizing the size difference of two fillers provided by the present invention is not only ingenious in conception, but also simple in operation, and can be produced by using existing polymer material modification processing equipment, with low cost and favorable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of network structure polymer composite material and its preparation, in particular to a polymer composite material with double network structure and its preparation method. Background technique [0002] Smartphones, laptops and other electronic products have completely entered people's daily lives and are closely related to people's lives. However, these products often have problems of poor heat dissipation and electromagnetic pollution. Therefore, polymer composite materials used in these electronic products are required to have excellent thermal conductivity to promote heat dissipation and excellent electrical conductivity to shield electromagnetic waves. [0003] Generally speaking, the thermal conductivity of polymer composites increases linearly with the increase of filler content, and no sudden change will occur near a certain filler content, while the electrical conductivity of polymer composites usua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08L77/02C08L81/02C08L75/04C08L23/12C08K3/04C08K7/24
Inventor 傅强吴凯陈枫
Owner SICHUAN UNIV
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