Preparation method of high-silica fiber cotton felt applied to automobile sound insulation pad

The invention relates to the technical field of high-silica fiber cotton felts of automobile sound insulation pads, and discloses a preparation method of a high-silica fiber cotton felt applied to an automobile sound insulation pad, and the preparation method comprises the following steps: S1, selecting proper high-silica fibers, and placing the high-silica fibers in a container for pretreatment; s2, an acetone solution is poured into the container containing the high-silica fibers, then uniform stirring is conducted, then a silane coupling agent is poured into the container, uniform stirring is conducted, and soaking is conducted for 2 h; s3, taking out the soaked high-silica fibers, and airing the high-silica fibers; s4, collecting the aired high-silica fibers through a cotton collecting machine provided with a negative pressure fan; s5, the collected high-silica fibers are subjected to primary opening through a cotton feeding weighing machine, and then the high-silica fibers subjected to primary opening ar