Porous ultrafine silica powder with core-shell structure and preparation method thereof

By preparing porous ultrafine silicon powder with a core-shell structure, the problem of poor compatibility between silicon powder and resin was solved, and high mechanical strength, low dielectric properties and thermal stability of copper clad laminate were achieved.

CN120208251BActive Publication Date: 2026-05-01广州豫顺新材料科技有限公司
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
广州豫顺新材料科技有限公司
Filing Date
2025-04-16
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing silicon micropowder and resin systems have poor compatibility, making it difficult to meet the requirements of low expansion coefficient, high mechanical strength and low dielectric constant for copper clad laminates. Traditional surface modification methods have limited effectiveness.

Method used

Porous ultrafine silica powder with a core-shell structure was prepared by sol-gel method. The core was coated with an amorphous porous silica shell. The particle morphology and pore structure were controlled by dispersants and volatile acids to improve sphericity and surface bonding strength.

Benefits of technology

The mechanical strength and dielectric properties of silicon micropowder are improved, the bonding strength with resin is enhanced, and the coefficient of thermal expansion and dielectric constant are reduced, thus meeting the high-performance requirements of copper clad laminates.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN120208251B_ABST
    Figure CN120208251B_ABST
Patent Text Reader

Abstract

The application discloses a kind of porous ultrafine silica powder with core-shell structure and its preparation method, the silica powder includes inner core and the shell of coating on the surface of inner core, the porosity of shell is greater than the porosity of inner core, the ratio of the radius r of inner core and the layer thickness d of shell satisfies 1:0.2~0.6;The silica powder gives consideration to mechanical strength and low dielectric property and high dimensional stability.The preparation method includes: on the basis of conventional silica powder as inner core, by sol-gel method, a layer of amorphous porous silica outer layer is coated, by adding dispersing agent, the agglomeration of particles is inhibited and the sphericity of the obtained porous ultrafine silica powder with core-shell structure is improved, further using the instantaneous high temperature during flash drying makes the surface of particles instantaneous shrinkage, improves the sphericity and surface bonding strength of the porous ultrafine silica powder with core-shell structure, and then the fluidity and mechanical strength of the material are improved.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Core-shell silica and method for producing it

    US20090053524A1