Stripping Mechanism And Application Research Of Gluconate Montmorillonite Nanobelts

Polymer/layered silicate nanocomposite is an organic/inorganic hybrid composite with many excellent performance. Adding inorganic nano-clay particles makes the mechanical properties, processing performance, barrier properties, thermal stability, etc of composite improved to varying degrees, which leads to good prospects. Montmorillonite is the main component of bentonite. Its layered structure and special features make it easy to peel. Thus montmorillonite has been the most valuable layered silicate material, which has attracted widespread attention of researchers.In this paper, exfoliated gluconate montmorillonite nanobelts were prepared using organic acid. Taking the length of montmorillonite nanobelts as targrt, the effects of dispersion and purification of raw materials, secondary dispersant and rotational speed of the exfoliating process were investigated with statistical method of SEM images. And SEM, XRD, DSC were used to characterize the morphology and basic structure of the product. What’s more, three kinds of water-soluble polymer materials were selected as the main target of applied research. The application effect of gluconate montmorillonite nanobelts was investigatived, and the differences in the application between long nanobelts (length of about36μm) and short nanobelts (length of about5μm) were also researched.The experiment of preparation results showed that:montmorillonite particles are made of montmorillonite nanobelts. The length of stripped montmorillonite nanobelt is longer if the following steps were employed: dispersing bentonite with the wet method, taking middle part of the suspension as purified raw material, using glycerol as secondary dispersant, and with the rotational speed of200r·min-1. In the process of acid activation and loading of alkaline, the drying and grinding procedure were canceled. The canceling of grinding process, adding of secondary dispersant and a lower stirring speed would prevent nanobelts from breaking. Montmorillonite nanoribbons are still layered material with the length of25～70μm, width of1～2μm, thickness less than100nm, and the gluconate was a kind of surface modifier.The experiment of application results showed that: the PVA film modified with long montmorillonite nanobelts (LMNB) was superior to the one modified with short montmorillonite nanobelts (SMNB). When the LMNB dosage was1.5%, both of the tensile strength and elongation at break of the PVA film would increase. Joining of montmorillonite nanoribbons could improve the viscosity of CMC-Na solution. The LMNB could make the CMC-Na solution viscosity improved by26.7%, and the SMNB could make the CMC-Na solution viscosity improved by11.4%. Furthermore, the addition of montmorillonite nanoribbons could enhance the moisture rate of HA solution. When the addition of montmorillonite nanobelts was15%, the moisture rate of HA solution increased by7%, but there was little difference between LMNB and SMNB in the effect of water retention.