HIGH-BARRIER POLYPROPYLENE CARBONATE-BASED COMPOSITE FILM MATERIAL AND PREPARATION METHOD THEREOF

摘要

Disclosed are a high-barrier polypropylene carbonate-based composite film material and a preparation method thereof. The film material comprises the following raw materials in parts by weight: 60-95 parts of polypropylene carbonate, 5-20 parts of polyvinyl alcohol, 0.5-10 parts of layered silicate and 5-20 parts of a plasticizer. The degradable high-barrier polypropylene carbonate-based composite film material prepared by modification using polypropylene carbonate as a base material has an oxygen permeability coefficient as low as 25cm3_um.(m2_24h_atm) and a water vapour permeability coefficient as low as 56g/(m2_24h). The material has improved barrier properties, thermal properties and mechanical properties, especially improved the barrier properties while the original characteristics of the base material are maintained and can replace completely high-barrier materials such as polyethylene-vinyl alcohol and is used for the production of various packaging products which require high-barrier.