High transparent polyester film and process for producing the same

Abstract

The high transparency polyester film contains nano level silica of grain size 20-50 nm and micron level silica of grain size 1.2-2.0 microns. The nano level silica accounts for 50-2000 ppm of total polyester film weight, and the micron level silica 1-300 ppm. The production process of the high transparency polyester film includes the first preparation of silica suspension, the subsequent conventional polymer producing course to produce polyester slice, and final conventional melting extrusion of the slice and bi-directional stretching. The product of the present invention has high transparency, waterproof property, blocking property, heat resistance and antiaging property.

Description

Technical field: [0001] The invention relates to a polymer compound, in particular to a polyester film, especially a highly transparent polyester film and a production method thereof. Background technique: [0002] Due to its excellent physical and mechanical properties, electrical insulation and heat resistance, good transparency and toughness, polyester film is widely used in packaging, tapes, electrical insulation, printing, drawing, photosensitive, labels and other fields. [0003] The slippage of the film surface has a great influence on the processing of polyester films, especially thin films, so controlling the slippage of the film surface is a basic requirement for film production. The slippage of the film surface is usually controlled by adding additives to increase the roughness of the film surface. The additives are usually inert particles such as silicon dioxide, clay, aluminum silicate, calcium phosphate and glass balls. However, while the addition of these add...

AI Technical Summary

Problems solved by technology

The film of the present invention can be applied to fields such as laser anti-counterfeiting trademarks, card protection films, decorations, etc. The present invention is compared with the prior art, because introducing nano-scale silicon dioxide particles into the polymer not only makes the strength of the polymer, The mechanical and physical properties such as rigidity and toughness have been significantly improved, and because of the small particle diameter and good light transmittance, the density of the plastic has been increased, and the light transmittance, water resistance, barrier property, heat resistance and aging resistance of the plastic have been improved. At the same time, due to the introduction of micron-sized silica, the problem of poor winding and slitting performance of the polyester film in the prior art is solved