A kind of preparation method of inorganic nanosheet/plastic laminated barrier film

Abstract

The invention provides a preparing method of inorganic nanosheet / plastic lamination barrier thin film. Inorganic nanosheets and plastic serve as raw materials of the inorganic nanosheet / plastic lamination barrier thin film. The preparing method comprises the steps that firstly, a layer of uniform and transparent ultrathin film is formed on the water surface by the inorganic nanosheets, then the inorganic nanosheet ultrathin film is transferred to the surface of plastic film, and then multiple pieces of plastic film covered with the inorganic nanosheet ultrathin film are stacked and integrallyheated or pressurized. The preparing method is characterized in that the inorganic nanosheet ultrathin film formed on the water surface is utilized to prepare the inorganic nanosheet / plastic lamination barrier thin film, wherein each piece of inorganic nanosheet ultrathin film effectively blocks gas permeation, and high barrier performance is generated under the joint effect of multiple pieces ofinorganic nanosheet ultrathin film. The preparing technology is simple, and the prepared inorganic nanosheet / plastic lamination barrier thin film can be used for sealed packaging of products like medical apparatuses and food.

Description

technical field [0001] The invention relates to the field of nanomaterial science and technology, in particular to the preparation of inorganic nanosheets / plastic barrier films. Background technique [0002] With the development of the packaging industry, people's requirements for packaging materials are gradually increasing. Packaging materials need to have a high barrier ability to gas, and also need to have high mechanical properties, excellent chemical stability and thermal stability to meet the high-temperature sterilization and low-temperature storage requirements of the contents. Due to easy processing and low price, plastics are widely used in various packaging materials; however, due to the small intermolecular force, plastics have poor barrier properties to gases or other small molecules, especially when the packaging is food, medicine, etc. For substances that are very sensitive to oxygen and water vapor, ordinary plastic packaging materials often have problems o...

AI Technical Summary

Problems solved by technology

Among them, the cost of vacuum evaporation of metal oxides is high; the barrier properties of multi-layer co-extruded composite films are still difficult to meet the requirements of many applications; filling inorganic nanoparticles by solution blending or melt blending, it is often difficult to uniformly disperse inorganic nanoparticles in the film , and the orientation is difficult to control, and it is distributed in an unreturned state, which makes the improvement of the barrier properties of the plastic film limited