Preparation of Montmorillonite Nanobelts Modified with Gluconic Acid
Exfoliated gluconic acid montmorillonite nanobelts were prepared via an organic acid modification method. The effects of dispersion methods and purification sites of raw materials, the secondary dispersant species and shear rate on the length of montmorillonite nanobelts were investigated. In addition, the application of products ware also explored. The results show that longer stripped montmorillonite nanobelts can be obtained when the following process is employed: disperse bentonite with a wet method; use the middle part of the suspension as a raw material; use glycerol as a secondary dispersant and apply a shear rate of 20.94 s?1 . SEM results demonstrate that montmorillonite nanobelts prepared are 25~70 μm in length, 1~2μm in width,and less than 100 nm in thickness. Mechanical grinding during pretreatment and modification can break the montmorillonite nanobelts. A push force from the internal reaction and a pull force from solvents exist in the preparation process and balanced forces can prevent montmorillonite nanobelts from breaking. Add montmorillonite nanobelts with average length of 36μm in aqueous solution of CMC and PVA film can increase the CMC solution viscosity by 26.7% and increase the PVA film elongation rate by 28.6%, which were both better than that of adding short montmorillonite nanobelts with average length of 5μm.
国家科技期刊平台
NSTL
万方数据
维普
