Thermally conductive insulating material for high-power LED substrate and preparation method thereof

[0032] This embodiment provides a thermally conductive insulating material for a high-power LED substrate, and the thermally conductive insulating material for a high-power LED substrate is prepared through the following steps:

[0033] (1) In parts by mass, add 30 parts of silicon oxide powder with an average particle size of 10nm to 3 parts of graft modifier maleic anhydride, then add 0.1 part of dispersant to polyacrylamide, and stir for 10 to 15 minutes. Then use ultrasonic dispersion for 20 to 30 minutes to disperse the nano-silica powder in the mixed solvent of maleic anhydride and polyacrylamide to form an emulsion-like dispersion;

[0034] (2) adding the emulsion-like dispersion prepared in the above step (1) to ultrasonic spray drying equipment for spray drying to prepare a powdery composite material containing nano-silicon oxide;

[0035] (3) Add the powdered composite material prepared in the above step (2) together with 7 parts of polypropylene resin powder from the f

[0042] This embodiment also provides a thermally conductive insulating material for a high-power LED substrate. The thermally conductive insulating material for a high-power LED substrate is prepared through the following steps:

[0043] (1) In parts by mass, add 80 parts of alumina powder with an average particle size of 30nm to 20 parts of graft modifier oleic acid, then add 10 parts of dispersant sodium lauryl sulfate, and stir for 10 to 15 minutes, and then use ultrasonic dispersion for 20 to 30 minutes to disperse the nano-alumina powder in the mixed solvent of oleic acid and sodium lauryl sulfate to form an emulsion-like dispersion;

[0044] (2) adding the emulsion-like dispersion prepared in the above step (1) to ultrasonic spray drying equipment for spray drying to prepare a powdery composite material containing nano-silicon oxide;

[0045] (3) Add the powdered composite material prepared in the above step (2) together with 40 parts of polyethylene resin powder from the f

[0052] This embodiment also provides a thermally conductive insulating material for a high-power LED substrate. The thermally conductive insulating material for a high-power LED substrate is prepared through the following steps:

[0053] (1) In parts by mass, add 30 parts of magnesium oxide powder with an average particle size of 50nm to 20 parts of graft modifier acrylic acid, then add 10 parts of dispersant as fatty acid polyethylene glycol ester, and stir for 10 to 15 minutes , and then use ultrasonic dispersion for 20 to 30 minutes to disperse the nano magnesium oxide powder in a mixed solvent of acrylic acid and fatty acid polyethylene glycol ester to form an emulsion-like dispersion;

[0054] (2) adding the emulsion-like dispersion prepared in the above step (1) to ultrasonic spray drying equipment for spray drying to prepare a powdery composite material containing nano-magnesia;

[0055] (3) Add the powdered composite material prepared in the above step (2) together with 40