Preparation method of liquid silicone rubber for packaging light-emitting diode

The invention relates to a preparation method of liquid silicone rubber for packaging a light-emitting diode, and belongs to the technical field of high-molecular materials. The preparation method comprises the following steps of: mixing vinyl-terminated hyperbranched polysiloxane with phenyl hydrogen-containing silicone oil, and then sufficiently and uniformly stirring to obtain first mixed liquid; adding an inhibitor and a catalyst to the first mixed liquid; sufficiently and uniformly stirring to obtain second mixed liquid; and vacuumizing the second mixed liquid till no bubble is generated to obtain the transparent liquid silicone rubber. The transparent liquid silicone rubber obtained by uniformly mixing the vinyl-terminated hyperbranched polysiloxane which substitutes for linear polysiloxane with the phenyl hydrogen-containing silicone oil and then adding the inhibitor and the catalyst has good flowability, is high in refractive index and light transmittance after being solidified and is suitable for being used as a packaging material in the field of electronic industry and especially suitable for packaging the light-emitting diode.