Polypropylene composite material with high thermal conductivity and preparation method thereof
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A composite material and high thermal conductivity technology, which is applied in the field of polypropylene composite materials and its preparation, can solve the problems of low thermal conductivity, low density, and low cost of polymers, so as to improve thermal conductivity, ensure mechanical properties, thermal The effect of high conductivity
Inactive Publication Date: 2016-06-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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[0002] Polymers such as polyethylene, polypropylene, epoxy resin, and polyimide have the advantages of low density, low cost, good che
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Embodiment 1
[0023] Composite materials with different dopamine-modified boron nitride mass fractions were prepared by the following melt blending method:
[0024] 1) Dry all the raw materials in a vacuum drying oven, the drying time is 8-15 hours, and the drying temperature is 80-100°C.
[0025] 2) Disperse 200-300g of boron nitride in 6000-10000ml of deionized water, sonicate for 30-60min, add 5-10g of tris(hydroxymethyl)aminomethane, and then add 10-20g of dopamine hydrochloride to adjust the pH of the solution to 8.5, stirring for 4 to 8 hours, ultrasonically centrifuging the reacted solution with deionized water for 5 to 10 times at a speed of 2000 to 4000 r / min, and drying to obtain dopamine-modified boron nitride.
[0026] 3) Add 8775g polypropylene, 225g maleic anhydride grafted polypropylene, and 3000g / 9000g dopamine-modified boron nitride prepared by the method described in step 2) into the extruder evenly, and extrude the sample after adjusting the temperature and rotating speed...
Embodiment 2
[0031] Composite materials with different dopamine-modified alumina mass fractions were prepared by the following melt blending method:
[0032] 1) Dry all the raw materials in a vacuum drying oven, the drying time is 8-15 hours, and the drying temperature is 80-100°C.
[0033] 2) Disperse 200-300g of alumina in 6000-10000ml of deionized water, sonicate for 30-60min, add 5-10g of tris(hydroxymethyl)aminomethane, and then add 10-20g of dopamine hydrochloride to adjust the pH of the solution to 8.5 , stirred for 4 to 8 hours, and the reacted solution was ultrasonically centrifuged for 5 to 10 times with deionized water at a speed of 2000 to 4000 r / min, and dried to obtain dopamine-modified alumina.
[0034] 3) 8775g polypropylene, 225g maleic anhydride grafted polypropylene, 3000g / 9000g dopamine-modified alumina prepared by the method described in step 2) are evenly added to the extruder, and the extruder is extruded after adjusting the extruder temperature and rotating speed. ...
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Abstract
The invention belongs to the technical field of thermally conductive composite materials, in particular relates to a polypropylene composite material with high thermal conductivity and a preparation method of the polypropylene composite material. The polypropylene composite material is prepared from polypropylene, a dopamine modified filler and maleic anhydride grafted polypropylene; the mass ratio of the polypropylene to the dopamine modified filler to the maleic anhydride grafted polypropylene is (47 percent to 74 percent):(25 percent to 50 percent):(1 percent to 3 percent); the filler is boron nitride, alumina or aluminum nitride. The preparation method is a melt-blending method; the obtained composite material has the advantages of light weight, chemical corrosion resistance, high thermal conductivity and the like; compared with the thermal conductivity (0.24 W/mK) of the conventional polypropylene, the thermal conductivity of the composite material with 25 weight percent of the filler is 4.94 W/mK which is 20.6 times that of the conventional polypropylene, and the thermal conductivity of the composite material with 50 weight percent of the filler is 7.92 W/mK which is 33 times that of the conventional polypropylene; the polypropylene composite material can be synthesized into the thermally conductive composite material with industrial application value, and is applicable to the fields requiring heat transfer and heat management, such as electronic packaging field, LED (light emitting diode) system field, heat exchanger field and motor field.
Description
technical field [0001] The invention belongs to the technical field of heat-conducting composite materials, and in particular relates to a polypropylene composite material with high thermal conductivity and a preparation method thereof. Background technique [0002] Polymers such as polyethylene, polypropylene, epoxy resin, and polyimide have the advantages of low density, low cost, good chemical corrosion resistance, and easy plasticity, but the thermal conductivity of polymers is usually low, generally less than 0.5 W / mK. Adding high thermal conductivity fillers such as carbon-based materials, metal fillers, and ceramic fillers to polymers can significantly increase the thermal conductivity of composites. The new heat-conducting composite material can be widely used in electronics, motors, heat exchangers and other fields. [0003] Polypropylene has excellent properties such as non-toxic, odorless, light weight, good impact strength, good electrical insulation, and easy ...
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