Preparation method for polysiloxane powder filler, polysiloxane powder filler obtained thereby and application thereof

    公开(公告)号:US12129341B2

    公开(公告)日:2024-10-29

    申请号:US17430573

    申请日:2019-09-29

    发明人: Shuzhen Chen Rui Li

    IPC分类号: C08G77/00 C08G77/12 C08J3/12

    摘要: Disclosed is a preparation method for a polysiloxane powder filler. The method comprises: providing polysiloxane which contains at least 60 wt % of T unit, wherein T unit is equal to R1SiO3-, R1 is a hydrogen atom or an independently selected organic group comprising 1-18 carbon atoms; and performing heat treatment on the polysiloxane under inert gas atmosphere or vacuum conditions, wherein the heat treatment temperature is 250 to 750 degrees, such that silicon hydroxyl groups in the polysiloxane are condensed to obtain a polysiloxane powder filler having a true density greater than or equal to 1.33 g/cm3 and more preferably greater than or equal to 1.34 g/cm3. The polysiloxane powder filler obtained by the described preparation method has low inductivity, low inductivity loss and low radioactivity; and can be used for semiconductor packaging materials, circuit boards and intermediate semi-finished products thereof, and semi-cured sheets or copper clad laminates of high-frequency high-speed circuit boards.