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Polypropylene composite material with high vertical thermal conductivity and excellent mechanical properties and preparation method thereof

A composite material and polypropylene technology, applied in the field of polypropylene composite materials and its preparation, can solve the problems of reducing the isotropy of material thermal conductivity, achieve low production costs, improve mechanical properties, and increase thermal conductivity.

Inactive Publication Date: 2019-12-17
JIANGSU NEW CARBON NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong van der Waals force and π-π interaction between the graphite sheets, the graphite sheets are easy to agglomerate and stack, and the degree of plane orientation is increased, which reduces the isotropy of the thermal conductivity of the material.

Method used

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  • Polypropylene composite material with high vertical thermal conductivity and excellent mechanical properties and preparation method thereof
  • Polypropylene composite material with high vertical thermal conductivity and excellent mechanical properties and preparation method thereof
  • Polypropylene composite material with high vertical thermal conductivity and excellent mechanical properties and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step (1): vacuum-dry polypropylene, flake graphite and spherical graphite at 80°C for 24 hours;

[0040] Step (2): Add 30g of polypropylene, 18.75g of flake graphite and 1.25g of spherical graphite into the internal mixer for melting and mixing at 190°C. During premixing, the rotor speed of the internal mixer is 20rpm, and melt and knead 2min, then the rotor speed was raised to 50rpm, and melted and kneaded for 5min to obtain a blend;

[0041] Step (3) The obtained blend is subjected to melt compression at a pressure of 20 MPa and a temperature of 220° C. for 7 minutes; at a pressure of 20 MPa and at room temperature for 2 minutes to prepare a sheet with a thickness of 500 μm.

[0042] The test results of the samples are shown in Table 1

Embodiment 2

[0044] Step (1): vacuum-dry polypropylene, flake graphite and spherical graphite at 80°C for 24 hours;

[0045] Step (2): Add 30g of polypropylene, 17.5g of flake graphite and 2.5g of spherical graphite into the internal mixer for melting and kneading at 190°C. During premixing, the rotor speed of the internal mixer is 20rpm, and melt and knead 2min, then the rotor speed was raised to 50rpm, and melted and kneaded for 5min to obtain a blend;

[0046] Step (3) The obtained blend is subjected to melt compression at a pressure of 20 MPa and a temperature of 220° C. for 7 minutes; at a pressure of 20 MPa and at room temperature for 2 minutes to prepare a sheet with a thickness of 500 μm.

[0047] The test results of the samples are shown in Table 1

Embodiment 3

[0049] Step (1): vacuum-dry polypropylene, flake graphite and spherical graphite at 80°C for 24 hours;

[0050] Step (2): Add 30g of polypropylene, 15g of flake graphite and 5g of spherical graphite into the internal mixer for melting and mixing at 190°C. During premixing, the rotor speed of the internal mixer is 20rpm, and melt and knead for 2min. Then the rotor speed was increased to 50rpm, melted and kneaded for 5min to obtain the blend;

[0051] Step (3) The obtained blend is subjected to melt compression at a pressure of 20 MPa and a temperature of 220° C. for 7 minutes; at a pressure of 20 MPa and at room temperature for 2 minutes to prepare a sheet with a thickness of 500 μm.

[0052] The test results of the samples are shown in Table 1

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Abstract

The invention discloses a polypropylene composite material with high vertical thermal conductivity and excellent mechanical properties and a preparation method of the polypropylene composite material.The polypropylene composite material is a blend of polypropylene, maleic anhydride grafted polypropylene and various carbon fillers. The various carbon fillers include at least a two-dimensional carbon-based structure and a zero-dimensional carbon-based structure. The polypropylene composite material disclosed by the invention has high heat-conducting property and excellent mechanical property inthe vertical direction, and due to the addition of the two-dimensional filler and the zero-dimensional filler, the plane orientation degree of filler piling can be reduced, and a relatively completemulti-dimensional filler network is formed; the maleic anhydride grafted polypropylene is added to improve the interface adhesion between the carbon fillers and the polypropylene matrix, thereby enhancing the mechanical properties of the polypropylene composite material, and the preparation method only needs common melt mixing equipment and is simple in industrial preparation.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a polypropylene composite material with high thermal conductivity and excellent mechanical properties obtained by hybridizing various fillers and grafting polypropylene with maleic anhydride and a preparation method thereof. Background technique [0002] Plastic heat exchangers have become a research hotspot in recent years due to their low cost, light weight and corrosion resistance, and have been widely used to replace traditional metal heat exchangers. Polypropylene is a general-purpose plastic with excellent mechanical properties and good chemical stability. It is widely used in the fields of electronics, machinery, chemical engineering, and automobile manufacturing. It is an ideal base material for plastic heat exchangers. However, since the thermal conductivity of polypropylene is only 0.2W / (m*K), its application in heat exchangers and other equipment is limited...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L51/06C08K7/00C08K3/04C08K7/18C08K7/06
CPCC08K3/04C08K7/00C08K7/18C08K2201/011C08L23/12C08L51/06C08K3/042C08K7/06C08K3/041
Inventor 李勇进张文军
Owner JIANGSU NEW CARBON NEW MATERIAL TECH CO LTD
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