分散剂和超剪切对二氧化硅的协同分散作用

doi:10.19964/j.issn.1006-4990.2022-0321

Abstract

Abstract:

In order to improve the dispersion of nano SiO₂ powder to extend its application，a series of terpolymer dispersants were synthesized by free radical solution polymerization with acrylic acid（AA） and butyl acrylate（BA） as main monomers and acrylamide（AM） as functional monomer.The molecular structure of the dispersant was characterized by FT-IR and ¹H-NMR，and its structure was verified.The dispersants were applied to the surface modification of nano-SiO₂ powder to promote its dispersion，and the role of super shear force field on the dispersion of nano SiO₂ powder was also studied.The effects of dispersant dosage，the strength of super shear force field and the time of dispersion on the average particle size of nano-SiO₂ were examined，and the process parameters were optimized.The results of laser diffraction particle size analysis and TEM showed that when the mass proportion of dispersant was 1% of SiO₂，the stiring speed of the super shear force field was 18 000 r/min，and the time of dispersion was 30 min，the dispersion performance of nano SiO₂ suspension was the best，which was due to the synergistic effects of dispersant and super shear.

Key words: acrylic acid, copolymer dispersant, surface modification, supershear, nano SiO₂

CLC Number:

TQ127.2

LIU Xueting, MAO Lingfeng, HU Yun, PENG Xi, FAN Xuemei, CHEN Yanlei, LIU Wenkui. Synergistic dispersion of SiO₂ by dispersant and supershear[J]. Inorganic Chemicals Industry, 2023, 55(3): 71-77.

Figures/Tables 11

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Synergistic dispersion of SiO₂ by dispersant and supershear

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