Low-warpage UV-resistant reflective film and its preparation method

Abstract

A low-warpage UV-resistant reflective film comprises a core layer. microbubbles are distributed inside the core layer. The core layer is composed of PET, TOPAS6013 produced by Polyplastics Co., Ltd., an ethene-ethyl acrylate-glycidyl methacrylate triblock copolymer and titanium dioxide particles. The low-warpage UV-resistant reflective film also comprises an upper surface layer and a lower surface layer. The upper and lower surface layers are composed of poly2,6-ethylene naphthalate, titanium dioxide and silicon dioxide. The preparation method comprises the following steps: the mixed upper surface layer material, the mixed lower surface layer material and the mixed core layer material are dried respectively, and then are extruded by a single screw extruder respectively, and after coextrusion of the extruded upper surface layer material, the extruded lower surface layer material and the extruded core layer material, the coextrusion materials are drawn longitudinally and then are drawn horizontally. The Low-warpage UV-resistant reflective film can be protected from ultraviolet irradiation, thus avoiding warpage phenomenon. In addition, the aging problem caused by ultraviolet irradiation is avoided.

Description

(1) Technical field [0001] The invention relates to a reflection film and a preparation method of the reflection film. (2) Background technology [0002] A liquid crystal display (LCD, Liquid Crystal Display) has become the most common display technology today. Because LCD has the advantages of environmental protection, low energy consumption, low radiation, soft picture, etc., LCD will be the mainstream display technology in the next few decades. The LCD is a non-luminous display device, which needs a backlight to achieve the display function, so the performance of the backlight will directly affect the image quality of the LCD. [0003] The main components of the backlight system include: light source, light guide plate, and various optical films. At present, there are mainly three types of light sources: EL, CCFL and LED, which can be divided into side-light type and direct-light type according to the different distribution positions of the light source. With the conti...

AI Technical Summary

Problems solved by technology

[0005] However, since the existing reflective films all use PE outer polyethylene terephthalate as the base material, and PET has a certain water absorption rate, the reflective film made of PET as the base material is in the production, processing, During the process of placing or using, it will absorb moisture in the environment, which will cause the deformation and distortion of the diaphragm, which is also called warping or waving in the industry. If it is assembled in a monitor or TV, the picture will be bright and dark. average problem

[0006] Moreover, since PET is not resistant to ultraviolet radiation, when the reflective film made of PET as the matrix resin is used in a liquid crystal display or a TV, especially in a CCFL display or a TV, the reflective film will age. After long-term use, the color of the diaphragm will turn yellow and the diaphragm will become brittle.

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