LED (light-emitting diode) high-thermal-conductivity composite material and preparation method thereof
A composite material and high thermal conductivity technology, which is applied in the field of LED high thermal conductivity composite materials and preparation, can solve the problems of high price of metal materials, low molding efficiency, and non-environmental protection, and achieve easy injection molding processing, low cost, and resource saving. Effect
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[0033] The preparation method of the LED high thermal conductivity composite material is characterized in that it comprises the following steps:
[0034] 1) Use a coupling agent to carry out surface treatment on the flaky inorganic filler, add flaky inorganic filler to the base material with nylon resin, and place it in a ball mill to mix evenly;
[0035] 2) Add the powdered inorganic filler and flame retardant to the mixture obtained in step 1), and place it in the ball mill again to mix evenly;
[0036] 3) When the mixture obtained in step 2) is preheated to 60-80°C, add a compatibilizer, and place it in a ball mill again to mix evenly;
[0037] 4) Put the mixed raw materials in step 3) into twin-screw extruders for granulation, and pack them into bags; wherein the content of each component is 60-90wt.% nylon resin as the matrix material, treated with a coupling agent After mixing 5-30wt.% flake inorganic filler and powdered inorganic filler, 2-10wt.% flame retardant and 0....
Embodiment 1
[0039] Select 70% matrix material granular nylon (PA46) and 20% flake graphite to carry out surface treatment with silane coupling agent at 25°C, and then place them in a ball mill for uniform mixing; then add 5% thermally conductive filler silicon carbide and 3% inorganic Add the halogenated flame retardant into the ball mill and mix evenly again to test its flame retardant grade; then heat the above mixture to 70°C, add 2% maleic anhydride (MAH) compatibilizer, mix again in the ball mill evenly, and test its thermal conductivity performance and physical and mechanical properties, and analyze its microstructure (such as figure 1 Shown); Finally, carry out extruding granulation by twin-screw extruder after 270 ℃, cool to normal temperature and pack, the specific data of the physical property parameter of gained product are as shown in table 1.
[0040] Table 1
[0041] Performance indicators of thermally conductive composite materials
Embodiment 2
[0043] Select 75% base material nylon (PA66) and 15% flake graphite to use titanate coupling agent for surface treatment at 25°C, and then place them in a ball mill for uniform mixing; then add 5% thermally conductive filler silicon carbide and 2% Add the aluminum-magnesium flame retardant into the ball mill and mix it evenly again to test its flame retardant grade; then heat the above mixture to 80°C, add 3% glycidyl methacrylate (GMA) graft compatibilizer, and put it in the ball mill again Mix evenly in the medium, test its thermal conductivity and physical and mechanical properties, and analyze its microstructure; finally, it is extruded and granulated by a twin-screw extruder at 275 ° C, and cooled to room temperature for packaging.
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