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Preparation method of low-thermal-shrinkage polyester polyester reflective film

A technology of reflective film and shrinkage rate, applied in the field of optical reflective film, can solve the problems affecting the taste of backlight modules, heat shrinkage of reflective film, etc., and achieve the effect of excellent reflectivity, low heat shrinkage rate, and reduction of heat shrinkage phenomenon.

Active Publication Date: 2017-05-17
NINGBO CHANGYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the LED light bar in the backlight will be on the side of the reflective film. Local high temperature will cause the reflective film to shrink, thus affecting the quality of the backlight module. Therefore, the preparation of low heat shrinkable reflective film is a very important issue.

Method used

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  • Preparation method of low-thermal-shrinkage polyester polyester reflective film
  • Preparation method of low-thermal-shrinkage polyester polyester reflective film
  • Preparation method of low-thermal-shrinkage polyester polyester reflective film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The preparation method of the polyester reflective film with low heat shrinkage provided by the present invention, wherein the polyester reflective film with low heat shrinkage is an ABA three-layer co-extruded structure, and the ratio of the A layer is 95% PET chips and 5% silicon dioxide particles. The proportion of layer B is 76% PET chips, intrinsic viscosity 0.68dL / g, 10% rutile titanium dioxide (inorganic particles), 10% polymethylpentene (incompatible resin), 2% MAH grafted HDPE (grafted branch rate ≥ 0.5%) (toughening resin), 2% acrylic resin (tackifying resin), and the percentages are percentages by weight. The thickness of layer A accounts for 5% of the total thickness, and the thickness of layer B accounts for 90% of the total thickness. The resulting reflective film had a thickness of 188 μm.

[0054] In the method, in the stretching process: the longitudinal stretching ratio is 3.5, and the longitudinal stretching temperature is 80-95°C; the transverse str...

Embodiment 2

[0057] The preparation method of the polyester reflective film with low heat shrinkage provided by the present invention, wherein the polyester reflective film with low heat shrinkage is an ABA three-layer co-extrusion structure, and the proportion of A layer is 95% PET chips and 5% calcium carbonate. The proportion of layer B is 73% PET chips, intrinsic viscosity 0.68dL / g, 10% rutile titanium dioxide, 12% cycloolefin copolymer, 2% MAH grafted SEBS (grafting rate ≥ 0.5%), 3% unsaturated Resin, said percentage is weight percentage. The thickness of layer A accounts for 5% of the total thickness, and the thickness of layer B accounts for 90% of the total thickness. The resulting reflective film had a thickness of 188 μm.

[0058] In the method, in the stretching process: the longitudinal stretching ratio is 4.2, and the longitudinal stretching temperature is 80-95°C; the transverse stretching ratio is 4.2, and the transverse stretching temperature is 100-125°C. In the process ...

Embodiment 3

[0061] The preparation method of the polyester reflective film with low heat shrinkage provided by the present invention, wherein the polyester reflective film with low heat shrinkage is an ABA three-layer co-extruded structure, and the ratio of the A layer is 90% of PET chips and 10% of silicon dioxide particles. The proportion of layer B is 60% PET chips, intrinsic viscosity 0.68dL / g, 15% anatase titanium dioxide, 15% polypropylene, 5% MAH grafted SEBS (grafting rate ≥ 0.5%), 5% acrylic resin , said percentage is a percentage by weight. The thickness of layer A accounts for 5% of the total thickness, and the thickness of layer B accounts for 90% of the total thickness. The resulting reflective film had a thickness of 188 μm.

[0062] In the method, in the stretching process: the longitudinal stretching ratio is 3.8, and the longitudinal stretching temperature is 80-95°C; the transverse stretching ratio is 3.8, and the transverse stretching temperature is 100-125°C. In the ...

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Abstract

The invention relates to an optical reflective film, especially to a preparation method of a low-thermal-shrinkage polyester polyester reflective film. In order to reduce thermal shrinkage of existing polyester reflective films, the invention provides a preparation method of a low-thermal-shrinkage polyester polyester reflective film. The polyester reflective film has an ABA three-layer co-extrusion structure. The B layer of the polyester reflective film has a foam structure therein. The preparation method comprises the following steps: (1) mixing raw materials for preparation of the polyester reflective film, melting and plasticizing, extruding by a three-layer co-extrusion process, and cooling a casting strip; longitudinally stretching the obtained casting strip and then transversely stretching; (2) carrying out heat-setting on the film obtained in the step (1) at the heat-setting temperature of 220-240 DEG C; and cooling and then carrying out heat treatment at the heat treatment temperature of 60-120 DEG C. The reflective film provided by the invention has low thermal shrinkage, excellent reflectivity and high stiffness.

Description

technical field [0001] The invention relates to an optical reflective film, in particular to a preparation method of a polyester reflective film with low heat shrinkage rate. Background technique [0002] In recent years, liquid crystal displays have been widely used as display devices for personal computers, televisions, mobile phones, and the like. These liquid crystal displays (LCDs) display by providing illumination light from a surface light source called a backlight inside. The backlight is mainly composed of a light source, a light guide plate and various optical films, and has the characteristics of high brightness, long life and uniform light emission. Among them, the reflective film is a very important optical film in the optical module. Its function is to reflect the light leaking from the bottom of the light guide plate efficiently and without loss, thereby reducing light loss and energy consumption. Since the reflective film is closely attached to the light gu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B32B5/18B32B37/15B32B37/08B32B38/12B32B38/00
Inventor 金亚东周玉波
Owner NINGBO CHANGYANG TECH
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