Optical function board

Abstract

The utility model relates to an optical function board, which comprises a polymer layer for bearing and supporting. The elastomer layer is attached to the polymer layer, and the elastomer layer and the polymer layer are attached in a double-layer co-extrusion mode; the outer surface of the elastomer layer is provided with a microstructure used for brightening, the microstructure is formed through transfer printing, and the polymer layer serves as a supporting structure of the elastomer layer in the transfer printing process. According to the utility model, by utilizing the resilience and wear resistance of the elastic body, the problem that the optical function plate is easy to wear in the preparation and transportation processes is effectively improved. The elastomer and the polymer matrix have good optical performance, the manufacturing cost is low, a high-performance optical functional layer can be prepared, and the wear resistance of the elastomer after crosslinking can be further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an optical function board. BACKGROUND

[0002] As one of the core components of LED television, the optical performance of the backlight module directly affects the brightness, contrast, color restoration and visual experience of the screen. The traditional LED television backlight module mainly relies on brightness enhancement film (BEF) and micro lens film (MLF) to improve the uniformity and brightness of light. That is, UV soft glue is coated and cured on a polyethylene terephthalate (PET) substrate, and the required brightness enhancement and M structure are formed. Or use polystyrene (PS), polymethyl methacrylate (PMMA) or polycarbonate (PC) as a transparent polymer for optical use as a substrate, and directly transfer the microstructure to the polymer surface. The corresponding defects are: the cost of UV glue is high, and it cannot be recycled after curing, which reduces the economy of the scheme. Ordinary optical grade polymers have high hardness and high rigidity, and are easy to wear during preparation, transportation and use, which limits the product yield and transportation. SUMMARY

[0003] In view of the above technical problems, the utility model uses an elastomer as the structure bearing layer of the polymer surface to prepare an optical microstructure plate, providing an excellent application scheme for a new type of microstructure optical function board, and the specific scheme is as follows:

[0004] An optical function board, comprising a polymer layer serving as a bearing support; an elastomer layer attached to the polymer layer, the elastomer layer and the polymer layer being attached by a double-layer co-extrusion method; the outer surface of the elastomer layer has a microstructure for brightness enhancement, the microstructure being transferred, and the polymer layer serving as a support structure for the elastomer layer during the transfer process.

[0005] The optical function board is further designed in that the thickness of the elastomer layer is 50-700 μm, and the thickness of the polymer layer is 300-1000 μm.

[0006] The optical function board is further designed in that the elastomer layer is prepared from any one of ethylene-vinyl acetate copolymer, polyolefin elastomer, thermoplastic elastomer, thermoplastic polyurethane, polyether ester elastomer, polyamide elastomer and ethylene-propylene-diene rubber.

[0007] The optical function board is further designed in that the polymer layer is prepared from any one of polystyrene, polymethyl methacrylate, polyethylene terephthalate, and styrene-methyl methacrylate copolymer.

[0008] Compared with the prior art, the utility model has the beneficial effects that:

[0009] (1) the resilience and wear resistance of the elastomer are utilized to effectively improve the wear problem of the optical functional plate caused in the preparation and transportation process.

[0010] (2) the elastomer and the polymer matrix have good optical properties, and the manufacturing cost is relatively low, so that a high-performance optical functional layer can be prepared.

[0011] (3) the wear resistance of the elastomer can be further improved after crosslinking.

[0012] It is worth noting that the elastomer is very soft and is prone to deformation as an optical layer, which leads to poor picture uniformity, so it is not usually used as an optical functional plate. In the utility model, the rigidity of PS is used as a supporting layer through double-layer co-extrusion, so that the elastomer is not prone to deformation. In addition, the extrusion temperature of the elastomer material is relatively low, which easily causes a large difference in the melt index between the elastomer and the polymer material, making it difficult to co-extrude. Therefore, the elastomer material is not usually used as a material for double-layer co-extrusion molding technology. In the utility model, elastomer materials and polymer materials with similar melt indexes are selected. The parent film of the prior art using UV glue / PET can cause the elastomer to be stuck, which destroys the overall structure. The use of a metal stencil for transfer printing has better results and is easy to separate. The conventional UV glue / PET film is used as a transfer printing parent film. The film is relatively soft and is prone to incomplete embossing structure or embossing deformation during the transfer printing process. The use of a metal stencil can better complete structure transfer printing and is not prone to deformation during the transfer printing process. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic diagram of an embodiment of the utility model.

[0014] Figure 2 is a data table of the optical functional plate of the embodiment and the comparative example of the utility model.

[0015] Figure 3 is a test data table of the optical functional plate of the embodiment and the comparative example of the utility model.

[0016] Figure 4 is a surface microstructure diagram of sample 12 of the embodiment.

[0017] Figure 5 is a surface microstructure diagram of sample 12 of the embodiment after being rubbed by a friction tester for 20 times. DETAILED DESCRIPTION

[0018] The utility model is further described below in combination with the drawings and embodiments:

[0019] For example, Figure 1An optical functional board is shown, comprising a polymer layer 1 for bearing and supporting; an elastomer layer 2 attached to the polymer layer, the elastomer layer is attached to the polymer layer by double-layer co-extrusion; the outer surface of the elastomer layer has a microstructure 3 for brightening, the microstructure is transferred, and the polymer layer acts as a supporting structure for the elastomer layer during the transfer process. Wherein, the thickness of the elastomer layer is 50-700μm, and the thickness of the polymer layer is 300-1000μm.

[0020] The elastomer layer is made of any one or several of ethylene-vinyl acetate copolymer (EVA), polyolefin elastomer (POE), thermoplastic elastomer (TPE), thermoplastic polyurethane (TPU), polyether ester elastomer (TPEE), polyamide elastomer (TPAE), and ethylene-propylene-diene rubber (EPDM).

[0021] The polymer layer is made of any one of polystyrene (PS), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), and styrene-methyl methacrylate copolymer (MS).

[0022] An optical functional board preparation method is shown, comprising the following steps: adding elastomer material to a first extruder, the extrusion temperature is 80-220℃; adding polymer material to a second extruder, the extrusion temperature is 180-260℃; applying double-layer extrusion technology to mix into a double-layer structure at the die; transferring the microstructure on the mold to the elastomer layer by microstructure transfer technology, the temperature of the transfer mold is 80-160℃; placing the double-layer structure board into an oven at 80-160℃ to promote cross-linking, and obtaining the optical functional board with double-layer structure. The elastomer material also contains 0-5% cross-linking agent and 0-5% initiator by mass. The cross-linking agent is any one or several of triallyl isocyanurate (TAIC), methyl allyl isocyanate (TMAIC), trimethylolpropane trimethacrylate (TMPTMA), triallyl cyanurate (TAC), and trimethylolpropane diallyl ether (TMPDE); the initiator is 2-ethylhexyl peroxide t-butyl carbonate (TBEC).

[0023] As shown in Figure 3 , Figure 4 The embodiments are as follows: Embodiment

[0024] 10kg EVA with 100g TAIC and 100g TBEC mixed evenly using a high-speed mixer, added to the first extruder, the extrusion temperature is 80-120℃, 40kg PS is added to the second extruder, the extrusion temperature is 180-200℃, and a double-layer extrusion technology is used to mix into a double-layer structure at the die. The microstructure transfer technology transfers the microstructure on the mold to the elastomer layer, and the transfer mold temperature is 80-120℃. The double-layer structure plate is placed in an oven at 80-120℃ to promote crosslinking, and a double-layer structure plate is obtained.

[0025] Example 2 10kg POE with 100g TAIC and 100g TBEC mixed evenly using a high-speed mixer, added to the first extruder, the extrusion temperature is 100-140℃, 40kg PS is added to the second extruder, the extrusion temperature is 180-200℃, and a double-layer extrusion technology is used to mix into a double-layer structure at the die.

[0026] The microstructure transfer technology transfers the microstructure on the mold to the elastomer layer, and the transfer mold temperature is 100-140℃.

[0027] The double-layer structure plate is placed in an oven at 100-140℃ to promote crosslinking, and a double-layer structure plate is obtained.

[0028] Examples 3, 4, 5, and 6, respectively, 10kg TPE, 10kg TPEE, 10kg TPAE, and 10kg EPDM are added with TAIC 100g, mixed evenly using a high-speed mixer, added to the first extruder, the extrusion temperature is 180-200℃, 40kg PS is added to the second extruder, the extrusion temperature is 180-200℃, and a double-layer extrusion technology is used to mix into a double-layer structure at the die. The microstructure transfer technology transfers the microstructure on the mold to the elastomer layer, and the transfer mold temperature is 140-160℃. The double-layer plate is crosslinked using an irradiation device, and the electron accelerator energy is 1-5MeV. Example

[0029] 10kg TPU is added to the first extruder, the extrusion temperature is 160-180℃, 40kg PS is added to the second extruder, the extrusion temperature is 180-200℃, and a double-layer extrusion technology is used to mix into a double-layer structure at the die.

[0030] The microstructure transfer technology transfers the microstructure on the mold to the elastomer layer, and the transfer mold temperature is 140-160℃.

[0031] Control group

[0032] The UV soft glue is uniformly coated on the PET surface, the microstructure on the mold is transferred to the UV glue by using the transfer technology, and the UV / PET film is obtained by curing under ultraviolet light.

[0033] By Figure 3 The test results combined Figure 4 , Figure 5 It can be seen that the transmittance and brightness decrease after the addition of the elastomer, but compared with the control group 1, the optical performance has no obvious change, and the wear resistance is effectively improved.

Claims

1. An optical functional sheet, characterized by: The application relates to a lightening film, which comprises a polymer layer serving as a bearing support; an elastomer layer attached to the polymer layer, wherein the elastomer layer is attached to the polymer layer through a double-layer co-extrusion mode; and a microstructure for lightening on the outer surface of the elastomer layer, wherein the microstructure is formed through a transfer printing process, and the polymer layer serves as a support structure for the elastomer layer during the transfer printing process.

2. The optically functional sheet according to claim 1, characterized by: The thickness of the elastomer layer is 50-700 mu m, and the thickness of the polymer layer is 300-1000 mu m.

3. The optically functional sheet according to claim 1, wherein: The elastomer layer is prepared from any one of ethylene-vinyl acetate copolymer, polyolefin elastomer, thermoplastic elastomer, thermoplastic polyurethane, polyether ester elastomer, polyamide elastomer and ethylene-propylene-diene rubber.

4. The optically functional sheet according to claim 1, wherein: The polymer layer is prepared from any one of polystyrene, polymethyl methacrylate, polyethylene terephthalate, styrene-methyl methacrylate copolymer.

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