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Preparation method of crystalline flake graphite filled polypropylene high-thermal-conductivity composite material and mold

A flake graphite and composite material technology, applied in the field of polymer composite materials, can solve the problems of low thermal conductivity, high radial thermal conductivity of composite materials, increase thermal conductivity anisotropy of composite materials, etc., so as to improve the vertical orientation degree of effect

Active Publication Date: 2022-03-25
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the thermal conductivity of this type of thermal conductive composite material in my country is not high, about 3.0-3.3W / m·K, especially during the processing and molding process, graphite is very easy to form a single plane (radial) orientation, resulting in the composite material The radial thermal conductivity is generally high, while the axial (vertical) thermal conductivity is generally not high, and even increases the thermal anisotropy of the composite material, thus limiting the application of this type of thermal conductive composite material in heat exchange technology

Method used

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  • Preparation method of crystalline flake graphite filled polypropylene high-thermal-conductivity composite material and mold
  • Preparation method of crystalline flake graphite filled polypropylene high-thermal-conductivity composite material and mold
  • Preparation method of crystalline flake graphite filled polypropylene high-thermal-conductivity composite material and mold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Add 0.2 parts by mass of coupling agent KH-550 to absolute ethanol with 4 parts by mass, ultrasonicate for 30 minutes, and mix evenly with 30 parts by mass of graphite flakes with a particle size of 15 μm at high speed, and then place them in a high-temperature drum Dry in an air drying oven at 110°C for 1 hour.

[0032] Step 2: Prepare the treated flake graphite, polypropylene S2040 with 50 parts by mass, polypropylene 230 with 20 parts by mass, antioxidant 1010 with 0.7 parts by mass, flow agent with 1 part by mass, 0.7 parts by mass The lubricant zinc stearate is mixed at high speed, and then mixed with an open mill. The mixing conditions: gap adjustment and mixing times are as follows: 3 grids 8 times, 5 grids 2 times, 7 grids 2 times, 9 grids 2 times , 11 grids 2 times; the temperature of the mill is: the front roller is 185°C, and the rear roller is 180°C. After the mixing is completed, a uniform masterbatch is obtained.

[0033] Step 3: Put the masterbat...

Embodiment 2

[0035] Step 1: 40 parts by mass of polypropylene K1035, 20 parts by mass of polypropylene 1937, the coupling agent is KH-560, the rest of the conditions are the same as in Example 1, and the amount of materials used is shown in Table 1.

[0036] Step 2: the antioxidant is antioxidant 1076, the lubricant is calcium stearate, and all the other conditions are the same as in Example 1.

[0037] Step 3: The steps are the same as in Example 1.

[0038] The detailed ratio is shown in Table 1 below:

[0039] Table 1 Flake graphite filled polypropylene high thermal conductivity composite material formula

[0040] components parts by mass Coupling agent KH-560 0.3 Absolute ethanol 6 flake graphite 40 Polypropylene K1035 40 Polypropylene 1937 20 Antioxidant 1076 0.6 flow agent 1 Zinc stearate 0.6

Embodiment 3

[0042] Step 1: 35 parts by mass of polypropylene 1940, 20 parts by mass of polypropylene M2600, the coupling agent is NDZ-102, the rest of the conditions are the same as in Example 1, and the amount of materials used is shown in Table 2.

[0043] Step 2: The antioxidants are antioxidant 1076 and antioxidant 168, and the rest of the conditions are the same as in Example 1.

[0044] Step 3: Put the masterbatch into the mold and melt it at high temperature. Under the pressure injection of the plunger, pass through the lower die and the upper die with an opening height of 0.5mm at a uniform speed along the horizontal and vertical directions respectively. The molding pressure is 7Mpa, and the other conditions are the same as Example 1 is the same.

[0045] The detailed ratio is shown in Table 2 below:

[0046] Table 2 Flake graphite filled polypropylene high thermal conductivity composite material formula

[0047] components parts by mass Coupling agent NDZ-102 ...

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Abstract

According to the preparation method of the crystalline flake graphite filled polypropylene high-thermal-conductivity composite material, the crystalline flake graphite filled polypropylene high-thermal-conductivity composite material comprises the following components in parts by mass: 30-85 parts of crystalline flake graphite, 15-70 parts of polypropylene, 0.5-2 parts of a coupling agent, 0.1-1 part of an antioxidant, 0.5-2 parts of a flowable agent and 0.2-1 part of a lubricant, and the crystalline flake graphite filled polypropylene high-thermal-conductivity composite material is prepared by adopting an injection-compression molding method. Comprising the following steps: adding a formula amount of coupling agent into absolute ethyl alcohol, performing ultrasonic treatment, uniformly mixing with a formula amount of crystalline flake graphite at a high speed, and drying at a high temperature; mixing the treated crystalline flake graphite, the polypropylene, the antioxidant, the flowing agent and the lubricating agent according to the formula ratio at a high speed, and mixing by using an open mill to obtain a uniform master batch; and filling the master batch into a mold for high-temperature melting, and under the pressure injection of a pressure injection core, enabling the master batch to pass through a mold orifice in the horizontal or vertical direction at a uniform speed and enter a cavity of the mold for pressure injection molding, thereby obtaining the composite material. The vertical orientation degree of the crystalline flake graphite in the composite material is improved in an injection-compression molding manner, so that the axial thermal conductivity of the composite material is improved.

Description

technical field [0001] The invention relates to a preparation method and a mold of a flake graphite-filled polypropylene high thermal conductivity composite material, belonging to the field of polymer composite materials. Background technique [0002] Thermally conductive materials are widely used in chemical, pharmaceutical, metallurgical and other fields. For a long time, metal materials have been chosen as thermally conductive materials. However, due to the poor corrosion resistance of metal materials, easy scaling, and high maintenance costs, their application range is limited. Therefore, it is very important to develop polymer-based thermally conductive materials that are corrosion-resistant, scale-inhibiting, and easy to process. [0003] Flake graphite filled polypropylene high thermal conductivity composite material has become a research hotspot in polymer-based thermal conductivity materials due to its many advantages such as corrosion resistance, light weight, low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/14C08L53/00C08K7/00C08K3/04C08K9/06C08K5/134C08K5/098B29C43/58B29C43/36
CPCC08L23/12C08L23/14C08L53/00B29C43/36B29C43/58B29C2043/5816B29C2043/5808C08K7/00C08K3/04C08K9/06C08K5/1345C08K5/098
Inventor 周海军李彦涛张贺广刘德居李肖建王铮铮陈孝起张芬周萌萌杨淑兰
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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