Preparation of Functionalization Spherical Silicon Oxideand and Its Application in Epoxy Molding Compound
The surface functionalization of spherical silica powder was carried out with different silane coupling agents.The crystal struc-ture,surface groups,pore structure,micro-morphology properties of spherical silica powder before and after were characterized by XRD、FTIR、BET,SEM.The particle size and hydrophobic oil absorption properties of the functionalized modified products were charac-terized by laser particle sizer,contact angle and absorption oil value.After the surface functionalization of the spherical silica powder,the crystal structure did not change significantly,the surface area was grafted with organic groups,and the specific surface area was re-duced,and it had good dispersion performance.The results showed that after functionalization,the contact angle was increased from 17° to 125°,and the absorption oil value was decreased from 52.1 mL/100 g to 36.1 mL/100 g.The functional spherical silica powder was used as filler for epoxy sealing material.Spiral flow length,gelation time,bending strength,flash edge and viscosity were investigated.The experimental results indicated that the functionlized spiral flow length of spherical silica powder was increased from 106.7 mm to 134.6 mm,the gelation time was increased from 25 s to 33 s,the flash value was decreased,the bending strength was increased from 142 MPa to 155 MPa,and the viscosity was reduced from 13.31 Pa·s to 8.39 Pa·s.The results show that the functionalized silica pow-der has good compatibility with epoxy resin as well as good dispersion,and improves the application performance of spherical silica pow-der.We found that the silane coupling agents play a key role as a molecular bridge that links spherical silica and epoxy resin.
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