CN212655728U

CN212655728U - Optical protective film

Info

Publication number: CN212655728U
Application number: CN202020980690.2U
Authority: CN
Inventors: 周永南; 戚荣军
Original assignee: Great Rich Technology Co Ltd
Current assignee: Great Rich Technology Co Ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2021-03-05
Anticipated expiration: 2030-06-02

Abstract

The utility model discloses an optical protection film, including the film, a top layer of film is the polyethylene top layer, and the surface on polyethylene top layer has set gradually corona layer and glue film, and the film is for crowded membrane altogether or including the crowded membrane altogether of polyethylene, and another top layer of film is the nylon layer. The film of the optical protective film is provided with a polyethylene surface layer and a nylon layer, wherein the nylon layer endows the optical protective film with good wear resistance, impact resistance, printing property and solvent resistance, and the tensile strength of the film can be further improved.

Description

Optical protective film

Technical Field

The utility model relates to a protection fields such as highlight working of plastics, backlight unit, cell-phone glass, concretely relates to optical protection film.

Background

The surface bonding protective film of highlight working of plastics, backlight unit, cell-phone glass etc. can reduce the fish tail to its surface in transportation, the assembling process. The traditional optical protective film is a polyethylene single-layer film with an adhesive layer. The single-layer polyethylene has the defect that the tensile strength of the film is poor, and the high temperature in the gluing process can influence the strength and the coating effect of the film.

The improved technical scheme is that the polyethylene film for glass packaging disclosed in CN205972399U comprises a film base film, glue is coated on the corona surface of the film base film, the film base film is composed of three co-extruded polyethylene resin layers, namely an outer polyethylene resin layer, a middle polyethylene resin layer and an inner polyethylene resin layer, the three polyethylene resin layers are completely the same, and adhesive tapes formed by glue coating are in strip-shaped interval distribution. Compared with a single-layer polyethylene film, the multi-layer co-extruded film has good tensile strength by configuring the composition and thickness of each layer of polyethylene, but has poor surface wear resistance, solvent resistance and printing performance.

In addition, CN201933041U discloses a polyethylene protective film, in which the adhesive layer is a polyacrylate pressure-sensitive adhesive layer or a rubber pressure-sensitive adhesive layer, and the two pressure-sensitive adhesives have poor air release properties, and are easy to generate bubbles when adhered to the glass surface, and residual adhesive is easy to remain on the surface of the protected object after the protective film is torn off.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the defect that exists among the prior art, provide an optical protection film, the protection effect is good, has low peeling strength, wear-resisting surface, and solvent resistance and the good characteristics of printability.

Realize above-mentioned technological effect, the utility model discloses a technical scheme does: the utility model provides an optical protection film, includes the film, a top layer of film is the polyethylene top layer, the surface on polyethylene top layer has set gradually corona layer and glue film, the film is for crowded membrane altogether, another top layer of film is the nylon layer.

The preferable technical scheme is that the number of the co-extrusion layers of the co-extrusion film is at least five. The number of the co-extrusion layers of the co-extruded film can be more than five. The barrier layer in the coextruded film may also be EVOH, PVDC, or other known materials.

The preferable technical scheme is that the laminated structure of the film comprises a nylon layer, a first bonding layer, a first polyethylene inner layer, a second polyethylene inner layer and a polyethylene surface layer. As an equivalent alternative, the nylon layer can also be formed by compounding the first adhesive layer and a co-extruded three-layer polyethylene co-extruded film.

The preferable technical scheme is that the adhesive layer is a two-component polyurethane adhesive drying adhesive layer. The two-component polyurethane adhesive drying adhesive layer is an adhesive material as described in Chinese adhesive,

volume

12, 12 nd, 21 nd volume 12 of book, preparation and performance research of two-component PU adhesive for PP or PE, and the main components are polyester polyol, mixed isocyanate, ethyl acetate, isocyanate curing agent and chain extender. The obtained bi-component polyurethane adhesive layer has good adhesiveness and smaller stripping force after gluing and drying.

The preferable technical scheme is that the thickness of the film is 40-80 mu m.

The preferable technical scheme is that the thickness of the glue layer is 5-10 mu m.

The preferable technical scheme is that the number of the co-extrusion layers of the co-extrusion film is seven, and the layered structure of the film comprises a polyethylene outer layer, a first bonding layer, a nylon core layer, a second bonding layer, a first polyethylene inner layer, a second polyethylene inner layer and a polyethylene surface layer. The nylon core layer of the inner layer has good moisture resistance, and under the high-temperature and high-humidity condition, the phenomenon that water vapor penetrates through the film to affect the bonding performance of the glue layer and/or peel off residual glue is avoided.

The utility model has the advantages and the beneficial effects that:

the film of the optical protective film is provided with a polyethylene surface layer and a nylon layer, wherein the nylon layer endows the optical protective film with good wear resistance, impact resistance, printing property and solvent resistance, and the tensile strength of the film can be further improved.

Drawings

FIG. 1 is a schematic view of the structure of an optical protective film according to example 1;

FIG. 2 is a schematic view showing the structure of the optical protective film of example 2;

FIG. 3 is a schematic view of the structure of the optical protective film of example 3;

FIG. 4 is a schematic view of the structure of the optical protective film of example 4;

in the figure: 1. a nylon layer; 2. a first adhesive layer; 3. a first inner polyethylene layer; 4. a second inner polyethylene layer; 5. a polyethylene skin layer; 6. a corona layer; 7. an acrylate pressure sensitive adhesive layer; 8. An outer polyethylene layer; 9. a nylon core layer; 10. a second adhesive layer; 11. drying the adhesive layer by using a double-component polyurethane adhesive; 12. an outer layer of nylon; 13. a nylon core layer.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example 1

As shown in fig. 1, the optical protective film of example 1 includes a film, the film is a five-layer co-extruded film, the layered structure includes a nylon layer 1, a first adhesive layer 2, a first polyethylene inner layer 3, a second polyethylene inner layer 4 and a polyethylene surface layer 5 in sequence, the polyethylene surface layer is subjected to corona treatment to obtain a corona layer 6 with low surface tension, and an acrylate pressure-sensitive adhesive layer 7 is disposed on the surface of the corona layer 6.

Based on embodiment 1, as an equivalent alternative, the nylon layer 1 in the optical protection film is also compounded with the three-layer polyethylene co-extruded film through the first adhesive layer 2.

Example 2

As shown in fig. 2, example 2 is based on example 1, except that the thin film is a co-extruded film, and the number of co-extruded layers of the co-extruded film is seven; the laminated structure of the film comprises a polyethylene outer layer 8, a first bonding layer 2, a nylon core layer 9, a second bonding layer 10, a first polyethylene inner layer 3, a second polyethylene inner layer 4 and a polyethylene surface layer 5. The adhesive layer is a two-component polyurethane adhesive drying adhesive layer 11.

Example 3

As shown in fig. 3, example 3 is based on example 2, in order to enhance the wear resistance of the film, the seven-layer co-extruded layered structure of the film comprises an outer nylon layer 12, a first adhesive layer 2, a nylon core layer 13, a second adhesive layer 10, a first inner polyethylene layer 3, a second inner polyethylene layer 4 and a polyethylene surface layer 5.

Example 4

As shown in fig. 4, example 4 is based on example 1, except that the seven-layer coextruded layered structure of the film is a nylon layer 1, a first adhesive layer 2, and a five-layer polyethylene coextruded film.

Specifically, the thickness of the film is 40-80 μm, and the thickness of the adhesive layer is 5-10 μm.

The method comprises the steps of gluing and drying a two-component polyurethane adhesive drying glue layer, volatilizing a solvent, reacting and curing polyester polyol and isocyanate, controlling the stripping force (generally 5-50 g) of an optical protective film by blending the two-component polyurethane adhesive, having good adhesion and exhaust performance, and simultaneously preventing the protected object from remaining residual glue and generating ghost images, and when the protective film is used for a highlight panel, preventing residual glue and fogging through high temperature and high humidity. The optical protective film has strong adaptability under high and low temperature conditions. Compared with examples 1 and 4, examples 2 and 3 have fewer bubbles generated during the process of attaching the optical protective film to the protected object. The middle film of the optical protective film in the embodiment 1-4 meets the requirement of tensile strength of a double-component polyurethane adhesive under the condition of drying temperature (60-90 ℃).

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides an optical protection film, includes the film, a top layer of film is the polyethylene top layer, the surface on polyethylene top layer has set gradually corona layer and glue film, its characterized in that, the film is crowded membrane altogether, another top layer of film is the nylon layer.

2. The optical protective film according to claim 1, wherein the number of co-extruded layers of the co-extruded film is at least five.

3. The optical protective film according to claim 2, wherein the layered structure of the film is a nylon layer, a first adhesive layer, a first polyethylene inner layer, a second polyethylene inner layer, and a polyethylene surface layer.

4. The optical protective film according to claim 1, wherein the adhesive layer is a two-component polyurethane adhesive baked adhesive layer.

5. The optical protective film according to claim 1, wherein the thickness of the film is 40 to 80 μm.

6. The optical protective film according to claim 1 or 4, wherein the thickness of the adhesive layer is 5 to 10 μm.

7. The optical protective film according to claim 2, wherein the number of the co-extruded layers of the co-extruded film is seven, and the layered structure of the film is a polyethylene outer layer, a first adhesive layer, a nylon core layer, a second adhesive layer, a first polyethylene inner layer, a second polyethylene inner layer and a polyethylene surface layer.