PC-PET (Polycarbonate-Polyethylene Terephthalate)-based LED (Light Emitting Diode) heat dissipation material containing modified calcium sulfate whisker-carbon nano tube and preparation method of PC-PET-based LED heat dissipation material

A technology of calcium sulfate whiskers and carbon nanotubes, applied in the field of thermally conductive engineering plastics, can solve the problems of low utilization rate of thermally conductive fillers, single conductive shape, long molding process cycle, etc., and achieve good comprehensive mechanical properties and low surface free energy , Improve the effect of performance

Inactive Publication Date: 2016-02-17
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AI-Extracted Technical Summary

Problems solved by technology

[0003] At present, the heat dissipation materials commonly used in LED packaging are mainly metal aluminum or ceramic materials. These materials have some defects in the actual use process. It has problems such as electrical conductivity and single shape. Although ceramic materials are insulating, they have a large specificity and high molding difficulty, which is not conducive to mass production and its application is also limited.
[0004] Composite thermally conductive plastics have gradually attracted the attention of the industry in recent years. First, the plastic itself has the advantages of good insulation, lig...
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The invention discloses a PC-PET (Polycarbonate-Polyethylene Terephthalate)-based LED (Light Emitting Diode) heat dissipation material containing modified calcium sulfate whiskers-carbon nano tubes and a preparation method of the PC-PET-based LED heat dissipation material. Composite plastic is characterized in that high polymer materials such as PC and PET are compounded to be used as thermal conductive plastic base stock, good comprehensive mechanical property is obtained, and insulation and durability are realized; the thermal conductivity of the composite plastic is effectively increased due to added nanocrystalline ceramic powder, calcium sulfate whisker-carbon nano tube composite powder which is doped in the added nanocrystalline ceramic powder and is modified by ionic liquid has low surface free energy and high thermal conductivity, the compatibility of the calcium sulfate whisker-carbon nano tube composite powder with high-polymer plastic is good, and a uniform and efficient thermal conducting network with good thixotropy can be formed in the base stock, so that good heat transfer and heat dissipation effects can be obtained, efficient reinforcing and toughening effects are also obtained, the using performance of the PC-PET-based LED heat dissipation material can be improved, and the PC-PET-based LED heat dissipation material has wide application space in LED packaging.

Technology Topic

Carbon nanotubePolyethylene terephthalate glycol +15


  • Experimental program(1)

Example Embodiment

[0014] The composite material is made from the following raw materials in parts by weight: PC40, PET8, ethylene acrylate maleic anhydride terpolymer 4, calcium sulfate whiskers 8, multi-walled carbon nanotubes 6, nanocrystalline ceramic powder 20, methyl methacrylate Ethoxylated silicone oil 1, hexafluorophosphate imidazole ionic liquid 1, silane coupling agent 1, antioxidant 0.5, light stabilizer 0.1, deionized water 30.
[0015] The preparation method of the composite plastic is:
[0016] (1) First, mix the hexafluorophosphate imidazole ionic liquid with deionized water, heat the oil bath to 50 °C, then stir and mix at a constant temperature for 25 minutes, and then heat up to 70 °C, add calcium sulfate whiskers, multi-walled carbon nanotubes , constant temperature ultrasonic stirring for 3h, after the stirring, the obtained material is completely dried to remove moisture, and the obtained powder is ground and dispersed to obtain ionic liquid modified calcium sulfate whisker/carbon nanotube composite powder;
[0017] (2) Mix PC, PET, ethylene acrylate maleic anhydride terpolymer, nanocrystalline ceramic powder, methyl ethoxy silicone oil, antioxidant, light stabilizer and 0.8 parts by weight of silane coupling agent at high speed After mixing evenly, put them into a twin-screw extruder for granulation to obtain a granulated material for later use;
[0018] (3) Stir and mix the composite powder prepared in step (1) and the remaining amount of silane coupling agent evenly for later use;
[0019] (4) The primary granulation material prepared in step (2) is put into the extruder through the main feeding port, the composite powder in step (3) is fed into the extruder through the side feeding port, extruded, granulated, cooled , that is, a composite thermally conductive material for injection molding is obtained.
[0020] The performance test results of the composite thermally conductive material prepared in this embodiment are:
[0021] project index Tensile strength (MPa) 80.2 Bending strength (MPa) 210 Thermal conductivity (w/mk) 7.0 Flammability rating UL94-V0 Volume resistivity (Ω.cm) >10 13


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