Polyester reflecting film and preparation method thereof

Abstract

The invention relates to a polyester reflecting film and a preparation method thereof. The polyester reflecting film comprises one or more surface layers and a middle porous core layer; the core layer comprises the following components in parts by weight: 40-90 parts of polyester slices, 1-55 parts of methyl isobornyl acrylate copolymers with epoxy groups, 0.05-1 part of a heat stabilizer and 0.05-1 part of a light stabilizer; and the surface layers comprise the following components: 80-95 parts of polyester slices, 5-20 parts of inorganic particles, 0.05-1 part of heat stabilizer and 0.05-1 part of light stabilizer, wherein the methyl isobornyl acrylate copolymers with epoxy groups have a glass transition temperature higher than 130 DEG C; and the grain size of the dispersing phase of the copolymer in the polyester matrix is 0.05 micron to 2.0 microns. According to the polyester reflecting film and the preparation method thereof, the methyl isobornyl acrylate copolymers with epoxy groups are used as pore-forming agent, so that the polyester reflecting film has the characteristics of being simple in formula, low in manufacturing cost, low in hot-shrinkage rate and good in mechanical performances.

Description

technical field [0001] The invention relates to a polyester reflective film and a preparation method thereof, belonging to the technical field of polyester reflective films. Background technique [0002] In recent years, polyester reflective films have been widely used in the fields of liquid crystal display reflectors, projection screens, planar light source components, and lighting reflectors. Polyester reflective film is a film with a porous core layer, high reflectivity, high whiteness, low light transmittance, good shading effect, and high strength. It is widely used in liquid crystal display (LCD) reflective film, LED lighting, advertising boxes and other fields. [0003] The white polyester reflective film is formed by co-extrusion and biaxial stretching after adding inorganic particles, incompatible polymer heat stabilizers and light stabilizers to polyester. For example, patent applications US20100086736, EP 2221336 A1, US20100086736 A1, US 2010 / 0285302 A1, US2010...

AI Technical Summary

Problems solved by technology

However, thermoplastic polyester elastomers It is a block copolymer containing polyester hard segment and polyether soft segment, its glass transition temperature is only 12°C, and due to the relatively large amount of dispersant added, the thermal shrinkage rate of the polyester reflective film increases and the mechanical properties decrease

Furthermore, when the existing polyester reflective film is made, it is necessary to uniformly mix polyester, incompatible polymers and dispersants through strong shearing, so there is still a problem of polyester degradation during masterbatch processing, which will also cause polyester The mechanical properties of the ester reflective film decreased, and the thermal shrinkage increased

With the development of high-power LED lighting equipment, the requirements for thermal shrinkage and mechanical properties of polyester reflective films will be higher and higher. However, the incompatible polymers and dispersants in polyester reflective films are currently use, which limits its application in fields such as high-power LED lighting

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