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Optical composite film and preparation method thereof

A technology of optical composite film and prism film, which is applied in the field of optical composite film, can solve the problems of sticking rolls in passing machines, limited market application, and easy sticking of viscous back coating, so as to enhance the bonding force and save production The effect of equipment cost

Active Publication Date: 2021-03-02
HEFEI LUCKY SCI & TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its technical drawback is that the sticky back coating is prone to sticking when winding, and sticking may occur when passing the machine, so the market application is not wide

Method used

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  • Optical composite film and preparation method thereof
  • Optical composite film and preparation method thereof
  • Optical composite film and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0028] The preparation method of optical composite film of the present invention is carried out according to the following steps:

[0029] (1) prepare back coat: coat back coat coating solution on the lower surface of the second support, coat through micro gravure roll, oven dry; back coat of the present invention is formed through thermosetting, does not have stickiness , can be directly rewinded and set aside. In order to ensure that the back coating is cured to surface dry without stickiness, the minimum degree of curing is an oven temperature of 60°C and an oven drying time of 30s; and, the thermal curing conditions exceed an oven temperature of 140°C and an oven drying time of 90s. There will be edge warping, which will affect the quality; therefore, the present invention sets the oven temperature at 60°C to 140°C, and the oven drying time at 30s to 90s.

[0030] (2) prepare the back coating of the first prism layer and the second prism film and bond: emboss the first pr...

Embodiment 1

[0037] The preparation of optical composite film comprises the following steps:

[0038] (1) prepare the back coating: the polyethylene terephthalate lower surface of 100 μ m is coated with the back coating coating solution, and the portion of each component of the coating solution is: 20g hydroxyacrylic resin (glass transition temperature 30°C); 0.8g polyisocyanate crosslinking agent; 0.4g hydroxyl-containing liquid rubber (glass transition temperature -10°C); 3.8g organic particles (polymethyl acrylate, particle size 5 μm); 75g butanone. Coated by a micro-gravure roller, dried in an oven set at 100°C for 60 seconds; then directly wound up and set aside.

[0039] (2) prepare the back coating of the first prism layer and the second prism film to fit: the first prism layer is embossed on the upper surface of another 100 μm polyethylene terephthalate; and step (1 ) The prepared back coating is unwound, heated in an oven, and the oven heating temperature is set at 60°C; the oven...

Embodiment 2

[0043] The preparation of optical composite film comprises the following steps:

[0044] (1) prepare the back coating: the polyethylene terephthalate lower surface of 125 μm is coated with the back coating coating solution, and the portion of each component of the coating solution is: 35g hydroxyacrylic resin (glass transition temperature 60°C); 5.6g polyisocyanate crosslinking agent; 0.7g isocyanate-containing liquid rubber (glass transition temperature -10°C); 8.7g organic particles (polycarbonate, particle size 1μm); 25g toluene, 25g ethyl acetate . Coated by a micro-gravure roll, dried in an oven set at 140°C for 90s; then directly wound up and set aside.

[0045] (2) prepare the back coating of the first prism layer and the second prism film and stick: emboss the first prism layer on the upper surface of the polyethylene terephthalate of another 125 μm; And step (1 ) The prepared back coating is unwound, heated in an oven, and the oven heating temperature is set at 100°...

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Abstract

The invention relates to an optical composite film and a preparation method thereof, the optical composite film comprises a first prism film and a second prism film from bottom to top, the first prismfilm comprises a first support body and a first prism layer coating the upper surface of the first support body; the second prism film comprises a second support body, a back coating layer coating the lower surface of the second support body, and a second prism layer coating the upper surface of the second support body; and the back coating layer is formed by coating and thermocuring a coating solution consisting of hydroxyl acrylic resin, a polyisocyanate cross-linking agent and liquid rubber through a micro gravure roller. In the preparation process of the optical composite film, the back coating layer is softened under a certain heating condition, and the first prism layer can be directly attached to the back coating layer; and the brightness of the prism films is not influenced on thebasis of ensuring that the back coating layer can be stably attached to the prism layer. The preparation method is simple in process and easy to operate, and has good reprocessing performance.

Description

technical field [0001] The invention relates to the technical field of thin films, in particular to an optical composite film. Background technique [0002] The traditional backlight module is mainly assembled from four films: lower diffusion film, lower prism film, upper prism film, and upper diffusion film. They need to be assembled one by one, which has disadvantages such as long production time, low assembly efficiency, and high defect rate. With the demand for ultra-clear, thin design and higher assembly yield of liquid crystal modules, in order to reduce the thickness of optical films, the use of composite films has emerged in the industry, including DOP (diffusion film and prism film paste) Combination) composite diaphragm, MOP (micro lens prism film and prism film bonding) composite diaphragm, POP (prism film and prism film bonding) composite diaphragm, etc. The application of the composite film can not only reduce the thickness of the optical film, but also the com...

Claims

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Application Information

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IPC IPC(8): G02B5/04G02B5/02
CPCG02B5/045G02B5/0242G02B5/0278
Inventor 王巧韩捷薛飞徐倩倩胡鑫万金龙刘玉磊
Owner HEFEI LUCKY SCI & TECH IND
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