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White reflective polyester film and preparation method thereof

A technology of polyester film and white reflection, which is applied in the field of white film, can solve the problems of limited increase in reflectivity and lower stiffness of reflective polyester film, and achieve low heat shrinkage, wide application range, high reflectivity and stiffness Effect

Active Publication Date: 2015-05-13
NINGBO CHANGYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the premise of requiring high reflectivity, it is necessary to increase the amount of inorganic particles in the polyester film, increase the amount of resin incompatible with polyester, etc., and increase the number of reflective interfaces in the polyester film, but due to the increase of inorganic particles The amount of the amount used and the amount of resin incompatible with polyester will reduce the stiffness of the reflective polyester film, and the increase in reflectivity is also extremely limited.

Method used

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  • White reflective polyester film and preparation method thereof
  • White reflective polyester film and preparation method thereof
  • White reflective polyester film and preparation method thereof

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preparation example Construction

[0039] The preparation method of the polyester film for white reflection provided by the invention comprises the following steps: (1) granulation: polyester resin, incompatible resin, inorganic particles, toughening resin, chain extender, nucleating agent and dispersant Mix evenly and carry out twin-screw mixing and granulation to obtain polyester functional masterbatch, polyester resin 25-60%, inorganic particles 15-67%, incompatible resin 15-30%, toughening resin 4-10%, expansion Chain agent 2-4%, nucleating agent 1-3% and dispersant 1-3%; (2) cast sheet: adopt three-layer coextrusion process; For B layer, polyester resin and step (1) obtain The polyester functional masterbatch is mixed according to the proportion, and then the ABA three-layer co-extrusion is melted and plasticized, and the cast sheet is cast; (3) Stretching into a film: the cast sheet obtained in step (2) is stretched longitudinally and transversely , heat setting, winding and packaging to obtain a white re...

Embodiment 1

[0049] In the polyester film for white reflection provided by the invention, the ratio of layer A is 99% of PET chips and 1% of silicon dioxide particles. The proportion of layer B is 66% PET chips, intrinsic viscosity 0.68dL / g, 15% rutile titanium dioxide, 10% polymethylpentene, 5% MAH grafted SEBS (grafting rate ≥ 0.5%), 2% carbonization Diimine, 1% Millad3988 (Milliken Company), 1% PEG (molecular weight: 20,000), and the stated percentages are weight percentages. The thickness of layer A accounts for 6% of the total thickness, and the thickness of layer B accounts for 88% of the total thickness. The thickness of the obtained reflective film is 188 μm, and the relevant properties are shown in Table 1.

Embodiment 2

[0051] In the polyester film for white reflection provided by the invention, the ratio of layer A is 99% of PET chips and 1% of silicon dioxide particles. The ratio of layer B is 56% PET chips, intrinsic viscosity 0.68dL / g, 25% barium sulfate, 10% polymethylpentene, 5% MAH grafted SEBS (grafting rate ≥ 0.5%), 2% carbon dioxide Amine, 1% Millad3988 (Milliken Company), 1% PEG (molecular weight: 20000), the percentages mentioned are weight percentages. A layer accounts for 6% of the total thickness, and B layer accounts for 88% of the total thickness. The thickness of the obtained reflective film is 188 μm, and the relevant properties are shown in Table 1.

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Abstract

The invention relates to a white reflective film, and provides a white reflective polyester film and a preparation method thereof in order to improve the reflectivity and stiffness of the conventional white reflective film. The film adopts an A-B-A three-layer structure, wherein the A-layer structure accounts for 4%-15% of the total thickness, and the B layer accounts for 70%-92% of the total thickness; the A layer comprises 50%-99.9% of polyester resin and 0.1%-50% of inorganic particles; the B layer comprises the polyester resin, the inorganic particles, incompatible resin, toughened resin, a chain extender, a nucleating agent and a dispersing agent; oval cell structures are arranged in the B layer, round resin particles are arranged in cells and adopt core-shell structures, the diameter of each core is 0.01-1 mu m, and the thickness of each shell is 0.01-0.1 mu m; and the thickness of the film is 50-350 mu m. The film has excellent reflectivity and stiffness.

Description

technical field [0001] The present invention relates to a white film, and more specifically, to a white reflective film suitable as a reflective member for a surface light source. 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 adopts a surface light source structure called a side-light type or a direct-light type in order to meet the requirement that the illumination light must uniformly illuminate the entire screen. Among them, the edge-light type, or the backlight type in which the light source is provided on the side with respect to the screen, is suitable for thin liquid crystal displays used in notebook computers and the like that are expected to be thinner and smaller. [0003] In the edge-lit b...

Claims

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Application Information

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IPC IPC(8): B32B27/06B32B27/36B32B5/22C08L67/02C08L23/12C08L23/06C08L23/20C08L45/00C08K13/02C08K3/36C08K3/22C08K3/26C08K3/30C08K5/053B29C69/02
Inventor 金亚东周玉波
Owner NINGBO CHANGYANG TECH
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