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Reflective film with high diffuse reflectivity and preparation method thereof

A reflective film and diffuse reflection technology, applied in the field of reflective film with high diffuse reflectivity and its preparation, can solve the problems of uneven light and dark, and the backlight module is easy to produce shadows, etc. Effects of size, improved brightness and uniformity

Active Publication Date: 2019-05-14
NINGBO CHANGYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that dark shadows are easily generated in existing backlight modules, the present invention provides a reflective film with high diffuse reflectivity and a preparation method thereof
The reflective film with high diffuse reflectivity provided by the present invention is applied to liquid crystal display backlight modules, especially in short OD backlight modules, which avoids the generation of shadows during use, and solves the problem of uneven brightness of light ("uneven brightness of light and dark light") " has the same meaning as "Shadow")

Method used

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  • Reflective film with high diffuse reflectivity and preparation method thereof
  • Reflective film with high diffuse reflectivity and preparation method thereof
  • Reflective film with high diffuse reflectivity and preparation method thereof

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Embodiment 1

[0049] In the reflective film with high diffuse reflectivity provided by the present invention, the ratio of layer A is 80% of PET chips and 20% of silicon dioxide particles. The ratio of layer B is 90% PET chips, 5% rutile TiO 2 , 2% cyclic olefin copolymer resin, 3% antistatic agent. The coating ratio is 76% solvent (butanone: ethyl acetate = 1:2), 20% acrylate adhesive, 1% aliphatic polyisocyanate, 1% polystyrene particles with a particle size of 15-20 μm, 2% polystyrene particles with a particle size of 5-10 μm, the percentage is weight percentage. The thickness of a layer A accounts for 8% of the total thickness of the reflective film substrate, the thickness of the B layer accounts for 84% of the total thickness of the reflective film substrate, the thickness of the reflective film substrate is 188 μm, and the coating thickness is 20 μm. The relevant properties are shown in Table 2.

Embodiment 2

[0051] In the reflective film with high diffuse reflectivity provided by the present invention, the ratio of layer A is 82% of PET chips and 18% of silicon dioxide particles. The ratio of layer B is 86% PET chips, 7% rutile TiO 2 , 3% cyclic olefin copolymer resin, 4% antistatic agent. The coating ratio is 71% solvent (butanone: toluene = 1:1), 23% water-based polyurethane adhesive, 2% aliphatic polyisocyanate, 1% polymethyl methacrylate particles with a particle size of 20-25 μm , 3% polystyrene particles with a particle size of 10-15 μm, the percentages are weight percentages. The thickness of a layer A accounts for 8% of the total thickness of the reflective film substrate, the thickness of the B layer accounts for 84% of the total thickness of the reflective film substrate, the thickness of the reflective film substrate is 188 μm, and the coating thickness is 20 μm. The relevant properties are shown in Table 2.

Embodiment 3

[0053] In the reflective film with high diffuse reflectivity provided by the present invention, the ratio of layer A is 85% of PET chips and 15% of silicon dioxide particles. The ratio of layer B is 82% PET chips, 9% rutile TiO 2 , 4% polymethylpentene, 5% antistatic agent. The coating ratio is 67% solvent (toluene: ethyl acetate = 1:1), 25% epoxy resin adhesive, 3% aliphatic polyisocyanate, 1% polybutylmethacrylate with a particle size of 25-30μm Ester particles, 4% of polystyrene particles with a particle size of 10-15 μm, the percentage is by weight. The thickness of a layer A accounts for 8% of the total thickness of the reflective film substrate, the thickness of the B layer accounts for 84% of the total thickness of the reflective film substrate, the thickness of the reflective film substrate is 188 μm, and the coating thickness is 20 μm. The relevant properties are shown in Table 2.

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Abstract

The invention relates to a reflective film used in a liquid crystal backlight source, in particular to a reflective film with high diffuse reflectivity and a preparation method thereof. In order to solve the problem that dark shadows are easily generated in the existing backlight module, the present invention provides a reflective film with high diffuse reflectivity and a preparation method thereof. The reflective film includes a reflective film substrate and a coating, the reflective film substrate has an ABA three-layer co-extrusion structure, and the coating is formulated into a coating solution before coating, and the coating solution includes the following Components: solvent 44‑76%, adhesive 20‑35%, isocyanate crosslinking agent 1‑8%, large particle size 1‑5%, large particle size is 15‑30μm; small particle size The particle size is 2-8%, and the particle size of the small-diameter particles is 5-15 μm; the stated percentages are percentages by weight. The reflective film with high diffuse reflectivity provided by the present invention is applied in the backlight module of liquid crystal display, and avoids the generation of dark shadows during use.

Description

technical field [0001] The invention relates to a reflective film used in a liquid crystal backlight source, in particular to a reflective film with high diffuse reflectivity and a preparation method thereof. Background technique [0002] In recent years, the development trend of liquid crystal displays tends to be thinner. At the same time, as one of the important components of liquid crystal displays, the backlight module is also developing in the direction of thinner. The problem of poor quality is easy to appear in the LED display, mainly manifested in the uneven distribution of light in the lit backlight module, and obvious LED light shadows (also called dark shadows) can be observed. This phenomenon seriously hinders the development of thinner backlight modules. . Existing backlight modules, especially short OD backlight modules, are prone to produce dark shadows (OD refers to the distance from the LED light to the diffuser plate in the direct-type backlight module, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/08G02B5/02
CPCG02B5/0226G02B5/0284G02B5/0816
Inventor 金亚东张园园
Owner NINGBO CHANGYANG TECH
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