分散剂和超剪切对二氧化硅的协同分散作用
收稿日期: 2022-05-24
网络出版日期: 2023-03-17
基金资助
安徽省重点研究和开发计划资助项目(201904a05020033);安徽省大学生创新创业训练计划项目(S202110359139)
Synergistic dispersion of SiO2 by dispersant and supershear
Received date: 2022-05-24
Online published: 2023-03-17
为了提高纳米二氧化硅粉体的分散性，拓展其应用领域，以丙烯酸（AA）、丙烯酸丁酯（BA）为主单体，丙烯酰胺（AM）为功能单体，经自由基溶液聚合法合成了一系列三元共聚物分散剂。采用红外光谱、核磁共振氢谱等对分散剂的分子结构进行了表征，验证了其结构。将此分散剂应用于二氧化硅纳米粉体的表面改性以提高其分散性，同时考察了外加超剪切力场对纳米二氧化硅粉体的分散效果，研究了分散剂用量、超剪切力场强度和分散时间等因素对纳米二氧化硅平均粒径的影响，优化了工艺参数。激光粒度和透射电镜分析结果表明，在分散剂用量为二氧化硅质量的1%、超剪切设备转速为18 000 r/min、分散时间为30 min条件下，由于分散剂和超剪切的协同作用，纳米二氧化硅悬浮液的分散性能最佳。
刘雪霆 , 毛凌峰 , 胡芸 , 彭溪 , 樊雪梅 , 陈严磊 , 刘文魁 . 分散剂和超剪切对二氧化硅的协同分散作用[J]. 无机盐工业, 2023 , 55(3) : 71 -77 . DOI: 10.19964/j.issn.1006-4990.2022-0321
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
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