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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, achieve low cost, facilitate popularization and application, and improve thermal and electrical conductivity.

Active Publication Date: 2016-01-20
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 fillers A and fillers B, wherein the size of the fillers A is 30 to 500 microns and the size of the fillers B is 1.0 to 20 microns; the size ratio of the fillers A to the fillers B is at least 20; the fillers A and the fillers B are uniformly distributed in a polymer base material, are in mutual overlap joint and penetrate through to form a conductive and heat-conducting access with a staggered network structure; the fillers B with the smaller size are distributed in grids of a loose network structure formed by the fillers A with the large size and are in mutual overlap joint to form a relatively dense network, and the inner part of the obtained composite material has a double-network structure which is good for moving electrons and reducing interface heat resistance, so that the conductive and heat-conducting performances are greatly improved at the same time. A method for constructing double networks by using the size difference of the two types of fillers has an ingenious concept and an operation method is simple; existing high molecular material modified machining equipment is used for realizing production; the method has low cost and is easy to popularize and apply.

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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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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