Preparation method of spherical silicon dioxide powder filler, powder filler obtained through preparation method and application of powder filler

• Main Authors: HUANG JIANGBO, LI WEN, FANG YUANFENG, WANG KE
• Format: Patent
• Language: Chinese; English
• Published: 01.10.2021
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; COMPOUNDS THEREOF; DYES; INORGANIC CHEMISTRY; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; NON-METALLIC ELEMENTS; PAINTS; POLISHES; USE OF MATERIALS AS ADHESIVES

The invention relates to a preparation method of a spherical silicon dioxide powder filler. The preparation method comprises the following steps: dispersing silicon dioxide particles in a water-containing liquid to obtain a dispersion liquid containing the silicon dioxide particles; adding a siloxane raw material into the dispersion liquid to obtain mixed slurry containing the silicon dioxide particles and the siloxane raw material, wherein the siloxane raw material comprises R1SiX3 silane or a hydrolytic condensation oligomer of the R1SiX3 silane; adding ammonia water into the mixed slurry to obtain spherical polysiloxane particles coated with silicon dioxide particles, wherein the particle size of the silicon dioxide particles is smaller than that of the spherical polysiloxane particles; and calcining the spherical polysiloxane particles in an oxygen-containing atmosphere to obtain the spherical silicon dioxide powder filler. The invention further relates to the powder filler obtained through the method and