High-temperature-resistant protective film without edge adhesive residue

Abstract

The utility model relates to the technical field of high-temperature-resistant protective films, in particular to a high-temperature-resistant protective film without edge adhesive residues, which comprises a base material layer, a high-temperature-resistant barrier layer, an adhesive layer and a release film which are sequentially connected in a composite mode from top to bottom. And the plurality of flaky adhesive layers are discontinuously arranged between the high-temperature-resistant barrier layer and the release film. The high-temperature-resistant barrier layer is coated between the base material and the adhesive layer, so that a good effect of preventing small molecules from being separated out is achieved, and the surface of a pasted object is prevented from being polluted; due to the design of the sheet-shaped adhesive layer, the adhesive layer can be prevented from being mechanically damaged by a cutter in the die cutting process, and the problem of adhesive residue on the die cutting edge is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature resistant protective films, and particularly relates to a high-temperature resistant protective film without edge residual glue. Background Art

[0002] In the 3C industry, for the processing and protection of screen display glass, especially for the processing of curved glass. Glass processing generally goes through one or more high-temperature processes to meet the product usage requirements. In this process, high-temperature resistant protective films are used to protect the whole or part of the glass to avoid problems such as pollution, scratching, erosion, and over-processing. At the same time, the protective film cannot cause secondary pollution to the glass itself, so high requirements are put forward for the protective film.

[0003] Currently, protective films are widely used in the 3C industry, mainly for process protection and shipping protection. For protection at room temperature, conventional PET or PE protective films can meet the requirements; but in the process of glass processing, it often needs to go through high-temperature processes, even multiple high-temperature processes, and the size of the protective film is smaller than the glass to be pasted. In this case, on the one hand, some small molecules in the substrate are likely to precipitate at high temperatures and contaminate the glass surface; on the other hand, edge glue marks will remain on the glass at the edges of the protective film, and these glue marks are difficult to clean and must be cleaned with a strong alkaline cleaning agent through a brush. For special material curved glass, on the one hand, due to the curved glass, the pressure of the brush cannot be too high during the transmission and cleaning process, and on the other hand, due to some special material glasses, such as microcrystalline glass, strong alkaline solvents cannot be used for the cleaning agent, resulting in incomplete cleaning of the glue marks around the glass. The conventional method is to use special equipment to polish the glass to clean the residual glue on the surface, but this will cause a large waste of labor and working hours, high costs, and increase the transportation risk.

[0004] Conventional pressure-sensitive adhesive protective films need to be die-cut into sheet materials of specific shapes and then pasted onto the glass for use. After the die-cut protective film is pasted onto the glass and then goes through high-temperature or multiple high-temperature processes, difficult-to-clean residual glue will remain on the glass surface around the edges, and small molecules in the substrate are prone to precipitate and also contaminate the glass surface. For example, CN218910211 U discloses a high-temperature resistant and highly transparent PET protective film. By adding a temperature-resistant coating on the outermost layer of the PET, the thermal shrinkage rate of the protective film is effectively reduced, the precipitation amount of oligomers after high temperature is reduced, and the light transmittance and viscosity of the protective film before and after high temperature are ensured. However, it cannot prevent small molecules in the PET from migrating to the surface of the adhesive layer after high and low temperatures, thereby contaminating the back-pasted object; but the adhesive surface is a complete adhesive surface, not a sheet adhesive layer, and die-cutting will mechanically damage the adhesive layer, resulting in residual glue at the edges around. Summary of the Utility Model

[0005] In view of the above shortcomings of the prior art, the utility model provides a high temperature resistant protective film without residual adhesive at the edge. Through a special coating process, a multi-layer protective film is prepared, including a substrate layer, and the lower surface of the substrate layer is a high temperature resistant barrier layer, a sheet-shaped high temperature resistant adhesive layer and a release film layer. By coating the high temperature resistant barrier layer between the substrate and the adhesive layer, it plays a good role in blocking the precipitation of small molecules, ensuring that the surface of the attached object is not contaminated; the intermittently arranged sheet-shaped adhesive layer design can prevent the adhesive layer from being mechanically damaged by the tool during the die-cutting process, effectively solving the problem of residual adhesive at the die-cutting edge.

[0006] Technical Solution

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The utility model provides a high temperature resistant protective film without edge residual adhesive, which comprises a substrate layer and an adhesive layer. The adhesive layer is composed of a plurality of sheet-like adhesive layers, and the plurality of sheet-like adhesive layers are intermittently arranged on the substrate layer.

[0009] Furthermore, it also includes a high temperature resistant barrier layer, which is arranged between the substrate layer and the adhesive layer, and the sheet-like adhesive layer is intermittently arranged on the high temperature resistant barrier layer.

[0010] Furthermore, it also includes a release film, which is arranged on the side of the adhesive layer away from the substrate layer.

[0011] Furthermore, a high-temperature resistant protective film without residual adhesive on the edges includes a substrate layer, a high-temperature resistant barrier layer, an adhesive layer and a release film which are compositely connected in sequence from top to bottom, wherein the adhesive layer is composed of a plurality of sheet-like adhesive layers, and the plurality of sheet-like adhesive layers are intermittently arranged between the high-temperature resistant barrier layer and the release film.

[0012] Furthermore, the substrate layer is made of PET film or PI film, and the thickness of the substrate layer is 2-200 um.

[0013] Furthermore, the high temperature resistant barrier layer is a polyester resin layer, and the thickness of the high temperature resistant barrier layer is 0.5-5 um.

[0014] Furthermore, the adhesive layer adopts a high temperature resistant adhesive, the adhesive layer is an acrylic adhesive, an organic silicone adhesive, or a polyurethane adhesive, and the thickness of the adhesive layer is 1-30 um.

[0015] Furthermore, the peeling force of the high temperature resistant protective film is 1-100g / 25mm;

[0016] Furthermore, the planar shape of the sheet-like adhesive layer is a rectangle, a square, an ellipse, a trapezoid, a circle or other irregular shapes, and a plurality of the sheet-like adhesive layers are arranged discontinuously.

[0017] Further, the release film is a single-silicon release film or a non-silicon release film, with a thickness of 15-75 um and a release force of 5-500 g / 25 mm;

[0018] The release film is made of PET material and can be a common non-antistatic release film, a back-release film, a release-side antistatic release film or a double-sided antistatic release film;

[0019] The impedance of the antistatic layer of the release film is 10 5 -10 11 Ω.

[0020] Further, by using a special coating process, the sheet adhesive layer is directly coated on the surface of the high-temperature barrier layer of the substrate. After drying and curing in an oven, the release film is laminated to form the above-mentioned structural protective film.

[0021] Further, the spacing between the sheet adhesive layers is 1-100 mm.

[0022] Beneficial effects

[0023] The technical solution provided by the present utility model has the following beneficial effects compared with the known public technology:

[0024] (1) By using a special coating process, the effect of sheet gluing is achieved, forming intermittently arranged sheet adhesive layers, and through the design of different engraving sizes, protective films or tapes with different adhesive layer shapes are prepared;

[0025] (2) According to the size of the glass to be processed, die-cutting tools are matched to ensure that the die-cut size is 0.1-5 mm larger than the size of the sheet adhesive layer around, so as to ensure the integrity of the adhesive surface and prevent mechanical damage. After laminating the glass and passing through the high-temperature process, no residual glue or glue marks will be left around; the design of no glue around is convenient for tearing, and no tear-handle design is required during die-cutting.

[0026] (3) The high-temperature barrier layer is a highly dense coating, which can effectively prevent the migration and precipitation of small molecules in the substrate layer to the surface of the adhesive layer, ensuring that neither the adhesive surface nor the glue-free area will contaminate the back-attached glass. Description of the drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1This is a schematic structural diagram of a high temperature resistant protective film without edge residual glue of the utility model;

[0029] Figure 2 This is a schematic diagram of the planar structure of a high temperature resistant protective film without edge residual adhesive of the utility model;

[0030] Figure 3 This is a schematic diagram of the structure described in Example 1;

[0031] Figure 4 This is a schematic diagram of the structure described in Example 2.

[0032] The numbers in the figure represent:

[0033] 1-substrate layer; 2-high temperature resistant barrier layer; 3-adhesive layer; 31-sheet adhesive layer; 4-release film. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] The utility model is further described below in conjunction with embodiments.

[0036] like Figure 1 and 2 As shown, a high temperature resistant protective film without edge residual adhesive comprises a substrate layer 1 and an adhesive layer 3, wherein the adhesive layer 3 is composed of a plurality of sheet-like adhesive layers 31, and the plurality of sheet-like adhesive layers 31 are intermittently arranged on the substrate layer.

[0037] As a preferred embodiment of the above embodiment, it further includes a high temperature resistant barrier layer 2 , wherein the high temperature resistant barrier layer 2 is disposed between the substrate layer 1 and the adhesive layer 3 , and the sheet adhesive layer 31 is intermittently arranged on the high temperature resistant barrier layer 2 .

[0038] In the above embodiment, it further includes a release film 4 , and the release film 4 is arranged on the side of the adhesive layer 3 facing away from the substrate layer 1 .

[0039] A high temperature resistant protective film without residual adhesive on the edges comprises a substrate layer 1, a high temperature resistant barrier layer 2, an adhesive layer 3 and a release film 4 which are compositely connected in sequence from top to bottom. The adhesive layer 3 is composed of a plurality of sheet-like adhesive layers 31, and the plurality of sheet-like adhesive layers are intermittently arranged between the high temperature resistant barrier layer and the release film.

[0040] The substrate layer 1 is made of PET film or PI film, and the thickness of the substrate layer is 2 - 200 um.

[0041] The high-temperature barrier layer 2 is a polyester resin layer, and the thickness of the high-temperature barrier layer 2 is 0.5 - 5 um. The high-temperature barrier layer is a commercially available polyester resin.

[0042] The adhesive layer 3 uses a high-temperature resistant adhesive, and the thickness of the adhesive layer 3 is 1 - 30 um.

[0043] The planar shape of the sheet-like adhesive layer 31 is rectangular, square, oval, trapezoidal, circular or other irregular shapes, and several of the sheet-like adhesive layers 31 are arranged discontinuously.

[0044] The release film 4 is a single-silicon release film or a non-silicon release film, with a thickness of 15 - 75 um and a release force of 5 - 500 g / 25 mm.

[0045] The release film 4 is made of PET material; the impedance of the antistatic layer of the release film 4 is 10 5 -10 11 Ω.

[0046] The distance between the sheet-like adhesive layers 31 is 1 - 100 mm.

[0047] The peel force of the high-temperature resistant protective film is 1 - 100 g / 25 mm.

[0048] (I) Embodiment

[0049] Embodiment 1:

[0050] A high-temperature resistant protective film without edge residual glue, which includes a substrate layer 1, a high-temperature barrier layer 2, an adhesive layer 3 and a release film 4 that are sequentially compounded and connected from top to bottom. The adhesive layer 3 is composed of several sheet-like adhesive layers 31, and several of the sheet-like adhesive layers 31 are discontinuously arranged between the high-temperature barrier layer 2 and the release film 4;

[0051] Substrate layer, select a 50 um transparent PET film; high-temperature barrier layer, thickness 2 um; adhesive layer is an acrylic adhesive, thickness of the adhesive layer 10 um; release film layer is a transparent release film, thickness 50 um, release force of the release surface 20 g / 25 mm.

[0052] Among them, the material of the high-temperature barrier layer is a commercially available polyester resin;

[0053] The manufacturer and model of the acrylic adhesive are: the material is acrylic glue from Boyixincheng High Polymer Materials Co., Ltd., model BY010;

[0054] The release film is purchased from Shandong Huake New Materials Co., Ltd.;

[0055] The sheet-shaped adhesive layer is rectangular, with dimensions of 60mm * 140mm, a spacing of 20mm, a chamfer radius of 8mm at the four corners, a non-adhesive area with a width of 20mm and a height of 8mm at the middle bang position, and a chamfer radius of 1mm at the four corners of the bang. Specifically, as shown in Figure 3 the figure.

[0056] Example 2:

[0057] A high-temperature resistant protective film without edge residual glue, which comprises a substrate layer 1, a high-temperature resistant barrier layer 2, an adhesive layer 3 and a release film 4 that are sequentially compounded and connected from top to bottom. The adhesive layer 3 is composed of several sheet-shaped adhesive layers 31, and several said sheet-shaped adhesive layers 31 are arranged discontinuously between the high-temperature resistant barrier layer 2 and the release film 4;

[0058] The substrate layer is a 36um transparent PET film; the high-temperature resistant barrier layer has a thickness of 3um; the adhesive is an organosilicon adhesive with an adhesive layer thickness of 18um; the release film layer has a thickness of 75um, a release force of 450g / 25mm on the release surface, and a back impedance value of 10^9Ω.

[0059] Among them, the material of the high-temperature resistant barrier layer is a commercially available polyester resin;

[0060] The manufacturer of the organosilicon adhesive is Dow Corning;

[0061] The release film is purchased from Shandong Huake New Materials Co., Ltd.;

[0062] The sheet-shaped adhesive layer is rectangular, with dimensions of 50mm * 150mm, a spacing of 25mm, and a chamfer radius of 8mm at the four corners. Specifically, as shown in Figure 4 the figure.

[0063] Comparative Example 1:

[0064] The difference from Example 1 is only that: the adhesive layer is a whole-surface structure.

[0065] Comparative Example 2:

[0066] The difference from Example 1 is only that: there is no high-temperature resistant barrier layer.

[0067] (2) Performance testing

[0068] Test method for the performance of residual glue and small molecule precipitation around after high temperature: After removing the release film from the protective film, stick it flat on a clean plain glass. Place the plain glass with the protective film on it in a high-temperature oven. After baking at 180°C for 30 minutes, take it out and cool for 30 minutes. Then place the glass in the high-temperature oven again. After baking at 180°C for 30 minutes, take it out. After cooling for 30 minutes, remove the protective film and visually observe the appearance of the glass surface under a strong light to check whether there is residual glue around and whether there is white fog (small molecule precipitation) on the whole surface.

[0069] Peeling force measurement method: Cut the protective film into strips with a width of 25 mm and a length of 200 mm. Tear off the release film of the strip, stick it flat on the test steel plate, roll the strip back and forth 3 times with a 2 kg roller, and after placing it for 20 min, use a peeling force testing machine to test. The peeling speed is 300 mm / min. The peeling force data of 3 strips are tested, and the average value is calculated.

[0070] The performance test results are shown in the following table:

[0071]

[0072]

[0073] For the high-temperature resistant protective film prepared by Example 1 and Example 2, during use, the protective film is cut by a die-cutting tool. The die-cutting tool cuts along the outer peripheral side of the sheet-shaped adhesive layer, and the outer peripheral edge of the die-cut size is larger than the size of the sheet-shaped adhesive layer. Then, the protective film is attached to the object to be attached. Since the die-cut size is larger than the size of the sheet-shaped adhesive layer around, the integrity of the adhesive surface is ensured, and mechanical damage will not be caused. After bonding to the glass and passing through the high-temperature process, no residual glue or glue marks will be left around; the design of no glue around is convenient for tearing off, and no tear-off hand design is required during die-cutting. In addition, for the adhesive layer with an integral sheet structure, there are residues around; for those without a high-temperature resistant barrier layer, small molecules are precipitated after high temperature.

[0074] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-temperature resistant protective film without edge residual glue, characterized in that It comprises a substrate layer (1) and an adhesive layer (3), wherein the adhesive layer (3) is composed of a plurality of sheet-like adhesive layers (31), and the plurality of sheet-like adhesive layers (31) are arranged discontinuously on the substrate layer.

2. The high-temperature resistant protective film without edge residual glue according to claim 1, characterized in that, It also includes a high temperature resistant barrier layer (2), wherein the high temperature resistant barrier layer (2) is arranged between the substrate layer (1) and the adhesive layer (3), and the sheet-like adhesive layer (31) is intermittently arranged on the high temperature resistant barrier layer (2).

3. A high-temperature resistant protective film without edge residual glue according to claim 1 or 2, characterized in that, It also includes a release film (4), wherein the release film (4) is arranged on the side of the adhesive layer (3) facing away from the substrate layer (1).

4. The high-temperature resistant protective film without edge residual glue according to claim 1, characterized in that, The substrate layer (1) is made of PET film or PI film, and the thickness of the substrate layer is 2-200 um.

5. The high-temperature resistant protective film without edge residual glue according to claim 2, characterized in that, The high temperature resistant barrier layer (2) is a polyester resin layer, and the thickness of the high temperature resistant barrier layer (2) is 0.5-5 um.

6. The high-temperature resistant protective film without edge residual glue according to claim 1, characterized in that, The adhesive layer (3) is made of a high temperature resistant adhesive, and the thickness of the adhesive layer (3) is 1-30 um.

7. The high-temperature resistant protective film without edge residual glue according to claim 1, characterized in that, The planar shape of the sheet-like adhesive layer (31) is a rectangle, a square, an ellipse, a trapezoid, a circle or other irregular shapes, and a plurality of the sheet-like adhesive layers (31) are arranged discontinuously.

8. The high-temperature resistant protective film without edge residual glue according to claim 3, characterized in that, The release film (4) is a single silicon release film or a non-silicon release film, with a thickness of 15-75 um and a release force of 5-500 g / 25 mm.

9. The high-temperature resistant protective film without edge residual glue according to claim 3, characterized in that, The release film (4) is made of PET material; the antistatic layer impedance of the release film (4) is 10 5 -10 11 Ω.

10. A high-temperature resistant protective film without edge residual glue according to claim 1, characterized in that, The spacing between the sheet-like adhesive layers (31) is 1-100 mm; The peeling force of the high temperature resistant protective film is 1-100g / 25mm.

Images