A high temperature resistant PET protective film

Abstract

The utility model provides a high-temperature resistant PET protective film, which comprises a first antistatic layer, a temperature-resistant layer, a PET substrate, a temperature-resistant barrier layer, a second antistatic layer, an antistatic adhesive layer and a release film which are sequentially arranged. Through the multi-layer structure design, the obtained high-temperature resistant PET protective film has excellent high and low temperature resistance, will not show obvious deformation and shrinkage after being subjected to high temperatures for many times, can effectively block the precipitation of small molecules, and can further ensure that the surface of the adhered object is not polluted, and at the same time, it is antistatic on all four sides, and can play a good antistatic effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of protective films, and in particular relates to a high-temperature resistant PET protective film. Background Art

[0002] Polyethylene terephthalate (PET) protective film is widely used in the 3C industry, mainly for process protection and shipment protection. For protection at room temperature, especially under temperature conditions below 160°C, conventional PET substrates with heat-resistant adhesive layers can meet the requirements, but when the temperature is above 160°C, especially under conditions of long insulation time and multiple high-temperature processes, conventional PET protective films will have serious problems of deformation and shrinkage on the one hand, and white mist or even residual adhesive will precipitate at high temperatures on the other hand. This phenomenon is caused by the poor high-temperature resistance of the glue itself on the one hand, and the small molecules in the PET substrate precipitate under high temperature conditions and run to the surface of the adhesive layer, thereby contaminating the object being pasted.

[0003] At present, many high temperature resistant protective films have been reported in the prior art. For example, CN218910211U discloses a high temperature resistant and highly transparent PET protective film. By adding a layer of temperature resistant coating to the outermost layer of PET, the heat shrinkage rate of the protective film is effectively reduced, the amount of oligomer precipitation after high temperature is reduced, and the transmittance and viscosity of the protective film before and after high temperature are guaranteed. However, it cannot prevent the precipitation of small molecules in PET after high and low temperatures and migration to the surface of the adhesive layer, thereby polluting the object being attached. For another example, CN117625070A discloses a high temperature resistant and low precipitation protective film, including a base film coated with an antistatic coating on both sides, and an adhesive layer and a release film stacked in sequence from one surface of the base film to the outside. By adding carbon nanotubes to the glue, it not only ensures the antistatic performance, but also solves the problem of precipitation of ordinary antistatic agents at high temperatures. However, there is still the problem that the protective film is easy to shrink and deform at high temperatures. At the same time, under multiple high temperatures, the small molecules in PET will still migrate to the surface of the adhesive layer, thereby polluting the object being attached.

[0004] Therefore, in view of the above technical problems, it is urgent to develop a high-temperature resistant PET protective film that will not show obvious deformation and shrinkage under multiple high temperatures and can effectively block the precipitation of small molecules. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a high-temperature resistant PET protective film. The high-temperature resistant PET protective film has excellent high and low temperature resistance through a specific multi-layer structure design. After multiple high temperatures (≥160°C), no obvious deformation or shrinkage will occur. It can also effectively block the precipitation of small molecules, thereby ensuring that the surface of the adhered object is not contaminated. At the same time, it is anti-static on all four sides and can achieve a good anti-static effect.

[0006] In order to achieve the purpose of this utility model, the utility model adopts the following technical solutions:

[0007] In a first aspect, the utility model provides a high temperature resistant PET protective film, which includes a first antistatic layer, a temperature resistant layer, a PET substrate, a temperature resistant barrier layer, a second antistatic layer, an antistatic adhesive layer and a release film which are arranged in sequence.

[0008] The high-temperature resistant PET protective film provided by the utility model comprises a first antistatic layer, a heat-resistant layer, a PET substrate, a heat-resistant barrier layer, a second antistatic layer, an antistatic adhesive layer and a release film which are sequentially arranged; on the one hand, by sequentially arranging the heat-resistant layer and the first antistatic layer outside the PET substrate, not only can the problem of deformation and shrinkage of PET at high temperature (≥160°C) be effectively improved, but also static electricity can be avoided, thereby effectively reducing the film tearing voltage; on the other hand, by arranging the heat-resistant barrier layer between the PET substrate and the antistatic adhesive layer, the precipitation problem of small molecules in the PET substrate under high and low temperature impact environments can be well blocked, thereby ensuring that the surface of the adhered object is not contaminated.

[0009] In summary, the high temperature resistant PET protective film provided by the utility model has excellent high and low temperature resistance and antistatic properties through the reasonable combination of the above-mentioned layers. It can also solve the problems of small molecule precipitation of PET substrate after multiple high temperatures and easy shrinkage and deformation of PET film after multiple high temperatures, ensuring extremely small voltage during the bonding and film tearing process.

[0010] When the high temperature resistant PET protective film provided by the utility model is used, the release film is firstly torn off, and then one side of the antistatic adhesive layer is attached to the surface of the attached object.

[0011] The "high temperature resistant PET protective film" mentioned in the present invention refers to a PET protective film that will not show obvious deformation and shrinkage at a temperature of ≥160°C.

[0012] The utility model has no special requirements on the preparation method of the high temperature resistant PET protective film provided, and the film can be prepared according to conventional methods in the art.

[0013] The utility model has no special requirements on the materials of each layer structure in the high temperature resistant PET protective film provided, all of which are conventional materials in the art and can be purchased through commercial products or prepared according to existing methods.

[0014] Preferably, the thickness of the first antistatic layer and the second antistatic layer are independently 0.1-1 μm, for example, 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm or 1 μm.

[0015] Preferably, the impedance of the first antistatic layer and the second antistatic layer are independently 10 5 ~10 11 Ω, for example 10 5 Ω, 10 6 Ω, 10 7 Ω, 10 8 Ω, 10 9 Ω or 10 10 Ω, etc.

[0016] Preferably, the thickness of the temperature-resistant layer is 2-5 μm, for example, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm or 5 μm.

[0017] Preferably, the heat-resistant layer is a polyurethane heat-resistant layer.

[0018] Preferably, the thickness of the PET substrate is 6 to 200 μm, for example, 6 μm, 10 μm, 20 μm, 40 μm, 60 μm, 80 μm, 100 μm, 120 μm, 140 μm, 160 μm, 180 μm or 200 μm.

[0019] Preferably, the PET substrate is a transparent PET substrate.

[0020] Preferably, the PET substrate is a PET substrate having a shrinkage rate ≤ 2% (e.g., 2%, 1.8%, 1.6%, 1.4%, 1.2%, 1%, 0.8%, 0.6%, 0.4% or 0.2%, etc.) after being kept at 180°C for 60 minutes, and this PET substrate is also an existing material.

[0021] Preferably, the thickness of the temperature-resistant barrier layer is 0.5-3 μm, for example, 0.5 μm, 0.9 μm, 1.3 μm, 1.7 μm, 2.1 μm, 2.5 μm, 2.7 μm or 3 μm.

[0022] Preferably, the temperature-resistant barrier layer is a polyester temperature-resistant barrier layer.

[0023] Preferably, the antistatic adhesive layer has a thickness of 2 to 20 μm, for example, 2 μm, 4 μm, 6 μm, 8 μm, 10 μm, 12 μm, 14 μm, 16 μm, 18 μm or 20 μm.

[0024] Preferably, the antistatic adhesive layer is an acrylic antistatic adhesive layer.

[0025] Preferably, the adhesive surface resistance value of the antistatic adhesive layer is 10 6 ~10 10 Ω, for example 10 6 Ω, 10 7 Ω, 108 Ω, 10 9 Ω or 10 10 Ω, etc.

[0026] Preferably, the peeling force of the antistatic adhesive layer is 5 to 20 g / 25 mm, for example, 5 g / 25 mm, 8 g / 25 mm, 10 g / 25 mm, 12 g / 25 mm, 15 g / 25 mm or 20 g / 25 mm.

[0027] Preferably, the release film is a single silicon release film or a non-silicone release film.

[0028] Preferably, the release film has a thickness of 15 to 75 μm, for example, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm or 75 μm.

[0029] Preferably, the release force of the release film is 5 to 500 g / 25 mm, for example, 5 g / 25 mm, 10 g / 25 mm, 20 g / 25 mm, 50 g / 25 mm, 100 g / 25 mm, 150 g / 25 mm, 200 g / 25 mm, 250 g / 25 mm, 300 g / 25 mm, 350 g / 25 mm, 400 g / 25 mm, 450 g / 25 mm or 500 g / 25 mm, etc.

[0030] Preferably, the impedance values ​​of both sides of the release film are 10 6 ~10 9 Ω, for example 10 6 Ω, 10 7 Ω, 10 8 Ω or 10 9 Ω, etc.

[0031] Compared with the prior art, the utility model has the following beneficial effects:

[0032] (1) The high temperature resistant PET protective film provided by the utility model has excellent high and low temperature resistance and will not show obvious deformation and shrinkage after being subjected to high temperatures for many times.

[0033] (2) The high temperature resistant PET protective film provided by the utility model can effectively block the problem of small molecules in the PET substrate being precipitated under high and low temperature impact environments, and can effectively ensure that the surface of the adhered object is free of residual glue, white mist and other pollution.

[0034] (3) The high temperature resistant PET protective film provided by the utility model can also avoid the generation of static electricity and effectively reduce the film tearing voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1A schematic diagram of the cross-sectional structure of the high temperature resistant PET protective film provided by the utility model;

[0036] Among them, 1 is the first antistatic layer, 2 is the temperature-resistant layer, 3 is the PET substrate, 4 is the temperature-resistant barrier layer, 5 is the second antistatic layer, 6 is the antistatic adhesive layer, and 7 is the release film. DETAILED DESCRIPTION

[0037] In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] The technical solution provided by the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments. Obviously, the specific implementation methods described are only part of the implementation methods of the present invention, rather than all the implementation methods.

[0039] Example 1

[0040] A high temperature resistant PET protective film, the cross-sectional structure diagram of which is as follows Figure 1 As shown, it includes a first antistatic layer 1, a temperature-resistant layer 2, a PET substrate 3, a temperature-resistant barrier layer 4, a second antistatic layer 5, an antistatic adhesive layer 6 and a release film 7 which are arranged in sequence;

[0041] The thickness of the first antistatic layer 1 and the second antistatic layer 5 are both 0.1 μm, and the impedance is 10 7 Ω, the raw material is the anti-static liquid of Suzhou Insai New Material Technology Co., Ltd., model T1106;

[0042] The thickness of the temperature-resistant layer 2 is 3 μm, and the material is commercially available polyurethane resin;

[0043] The thickness of the PET substrate 3 is 50 μm, specifically a transparent PET film purchased from Jiangsu Shuangxing Color Plastic New Materials Co., Ltd., model BOPET-BH-50;

[0044] The thickness of the temperature-resistant barrier layer 4 is 1 μm, and the material is commercially available polyester resin;

[0045] The thickness of the antistatic adhesive layer 6 is 10 μm, the peeling force is 8 g / 25 mm, and the adhesive surface resistance value is 10 9 Ω, the material is acrylic glue from Boyixincheng Polymer Materials Co., Ltd., model BY010;

[0046] The thickness of the release film 7 is 50 μm, the release force of the release surface is 15 g / 25 mm, and the impedance values ​​of both sides are 10 8 Ω, specifically a single silicon release film, purchased from Shandong Huake New Materials Co., Ltd.

[0047] Example 2

[0048] A high temperature resistant PET protective film, whose cross-sectional structure is the same as that of Example 1, comprising a first antistatic layer, a temperature resistant layer, a PET substrate, a temperature resistant barrier layer, a second antistatic layer, an antistatic adhesive layer and a release film arranged in sequence;

[0049] The thickness of the first antistatic layer and the second antistatic layer are both 0.1 μm, and the impedance is 10 7 Ω, the raw material is the anti-static liquid of Suzhou Insai New Material Technology Co., Ltd., model T1106;

[0050] The thickness of the heat-resistant layer is 2 μm, and the material is commercially available polyurethane resin;

[0051] The thickness of the PET substrate is 36 μm, specifically a transparent PET film purchased from Jiangsu Shuangxing Color Plastic New Materials Co., Ltd., model BOPET-BH-36;

[0052] The thickness of the heat-resistant barrier layer is 0.5 μm, and the material is commercially available polyester resin;

[0053] The thickness of the antistatic adhesive layer is 14μm, the peeling force is 8g / 25mm, and the adhesive surface impedance is 10 8 Ω, the material is acrylic glue from Boyixincheng Polymer Materials Co., Ltd., model BY010;

[0054] The thickness of the release film is 36μm, the release force of the release surface is 300g / 25mm, and the impedance value of both sides is 10 8 Ω, specifically non-silicone release film, purchased from Shandong Huake New Materials Co., Ltd.

[0055] Example 3

[0056] A high temperature resistant PET protective film, which differs from Example 1 in that the thickness of the temperature resistant barrier layer is 3 μm, and other structures and parameters are the same as those of Example 1.

[0057] Comparative Example 1

[0058] A PET protective film, which differs from Example 1 in that the first antistatic layer and the second antistatic layer are not provided, and other structures and parameters are the same as those of Example 1.

[0059] Comparative Example 2

[0060] A PET protective film, which differs from Example 1 in that no temperature-resistant layer is provided, and other structures and parameters are the same as those of Example 1.

[0061] Comparative Example 3

[0062] A PET protective film, which differs from Example 1 in that no temperature-resistant barrier layer is provided, and other structures and parameters are the same as those of Example 1.

[0063] Performance Test:

[0064] (1) Thermal shrinkage: Cut the PET protective film into samples of 100 × 100 mm, measure and mark the lengths in the MD and TD directions, remove the release film from the samples and place them in a high-temperature oven. After baking at 180°C for 30 min, take them out and cool them for 30 min. Then place the samples in a high-temperature oven again, bake them at 180°C for 30 min, take them out and cool them for 30 min. Measure the lengths in the MD and TD directions after baking, calculate the shrinkage in the MD and TD directions, and visually observe the flatness.

[0065] (2) Small molecule precipitation: After removing the release film from the PET protective film, stick it evenly on a clean plain glass. Place the plain glass in a high-temperature oven, bake it at 180°C / 30 min, take it out and cool it for 30 min. Place the glass in a high-temperature oven again, bake it at 180°C / 30 min, take it out, cool it for 30 min, remove the high-temperature resistant PET protective film, and visually observe whether there is white fog on the surface of the glass under a strong light.

[0066] (3) Film tearing voltage: Cut the PET protective film into 50 mm wide, place it flat on the table with the release film facing upwards, and tear off the release film in a 180° direction at a tearing speed of 500 mm / min. Measure the voltage value while tearing the film.

[0067] The PET protective films provided in Examples 1 to 3 and Comparative Examples 1 to 3 were tested according to the above test method. The test results are shown in Table 1:

[0068] Table 1

[0069]

[0070] From the data in Table 1, we can see that:

[0071] (1) The heat shrinkage rate of the high temperature resistant PET protective film provided in Examples 1 to 3 in the MD direction is only 1.1 to 1.3%, and the heat shrinkage rate in the TD direction is only 0.1%. The film surface is flat without obvious deformation and no small molecules are precipitated. The film tearing voltage is only 35 to 86 V, indicating that the high temperature resistant PET protective film provided by the utility model has excellent high and low temperature resistance, will not show obvious deformation and shrinkage after multiple high temperature exposures, and can effectively block the precipitation of small molecules, thereby ensuring that the surface of the adhered object is not contaminated, and can also play a good anti-static effect.

[0072] (2) Compared with Example 1, the PET protective film provided in Comparative Example 1 has no first antistatic layer and second antistatic layer, resulting in a film tearing voltage as high as 339 V, and a poor antistatic effect.

[0073] (3) Compared with Example 1, the PET protective film provided in Comparative Example 2 has no heat-resistant layer, so the heat shrinkage rate in the MD direction after multiple high-temperature exposures is as high as 1.6%, and the film is significantly deformed as a whole. At the same time, its high and low temperature resistance is poor.

[0074] (4) Compared with Example 1, the PET protective film provided in Comparative Example 3 does not have a heat-resistant barrier layer, resulting in white fog on the surface of the adhered object after multiple high-temperature exposures, indicating that it cannot effectively block the precipitation of small molecules in the PET film.

[0075] The applicant declares that the utility model illustrates a high temperature resistant PET protective film through the above-mentioned embodiments, but the utility model is not limited to the above-mentioned process steps, that is, it does not mean that the utility model must rely on the above-mentioned process steps to be implemented. The technicians in the relevant technical field should understand that any improvement to the utility model, the equivalent replacement of the raw materials selected by the utility model, the addition of auxiliary components, the selection of specific methods, etc., all fall within the protection scope and disclosure scope of the utility model.

Claims

1. A high temperature resistant PET protective film, characterized in that: The high temperature resistant PET protective film comprises a first antistatic layer, a temperature resistant layer, a PET substrate, a temperature resistant barrier layer, a second antistatic layer, an antistatic adhesive layer and a release film which are arranged in sequence.

2. The high temperature resistant PET protective film according to claim 1, characterized in that: The thickness of the first antistatic layer and the second antistatic layer are each independently 0.1 to 1 μm.

3. The high temperature resistant PET protective film according to claim 1, characterized in that: The thickness of the heat-resistant layer is 2-5 μm.

4. The high temperature resistant PET protective film according to claim 1, characterized in that: The heat-resistant layer is a polyurethane heat-resistant layer.

5. The high temperature resistant PET protective film according to claim 1, characterized in that: The thickness of the PET substrate is 6 to 200 μm.

6. The high temperature resistant PET protective film according to claim 1, characterized in that: The thickness of the heat-resistant barrier layer is 0.5-3 μm.

7. The high temperature resistant PET protective film according to claim 1, characterized in that: The heat-resistant barrier layer is a polyester heat-resistant barrier layer.

8. The high temperature resistant PET protective film according to claim 1, characterized in that: The thickness of the antistatic adhesive layer is 2 to 20 μm.

9. The high temperature resistant PET protective film according to claim 1, characterized in that: The release film is a single silicon release film or a non-silicon release film.

10. The high temperature resistant PET protective film according to claim 1, characterized in that: The release film has a thickness of 15 to 75 μm.

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