溶胶原位沉积法制备硅化微晶纤维素及其粉体性能研究

Preparation of Silicified Microcrystalline Cellulose by Sol In-situ Deposition and Its Powder Properties

关键词:  溶胶原位沉积法  硅化微晶纤维素  SiO₂  正硅酸乙酯

Key Words:sol in-situ deposition  silicified microcrystalline cellulose  SiO₂  ethyl orthosilicate

摘要:本研究采用溶胶原位沉积法在微晶纤维素（MCC）表面形成SiO₂，制备了硅化微晶纤维素（SMCC）。结果表明，随着共溶剂中异丙醇量的增加，SiO₂粒径减小且粒径分布更加均匀；当异丙醇为共溶剂，正硅酸乙酯添加量为0.8 mg/L时，自制SMCC性能最佳；表面被SiO₂基本均匀覆盖，且比表面积大于进口SMCC；自制SMCC和原料MCC的整体粒径分布无明显差异，但自制SMCC的各项粉体综合性能指标均优于原料MCC及国产SMCC，且接近于进口SMCC。

Abstract:In this study， sol in-situ deposition method was used to form SiO₂ on the surface of microcrystalline cellulose （MCC） to prepare silicified microcrystalline cellulose （SMCC）. The results showed that as the amount of isopropanol in the co-solvent increased， the particle size of SiO₂ decreased and the particle size distribution became more uniform. When isopropanol was used as co-solvent and ethyl orthosilicate was added at 0.8 mg/L， self-made SMCC had the best performance. The surface of self-made SMCC was basically evenly covered by SiO₂， and the specific surface area of SMCC was larger than that of imported SMCC. There was no significant difference in the overall particle size distribution of self-made SMCC and raw MCC， but the comprehensive performance indicators of self-made SMCC were better than raw MCC and domestic SMCC， and were close to imported SMCC.