Supporting protective film adhesive tape and preparation method thereof

Abstract

The invention relates to a supporting protective film adhesive tape and a preparation method thereof. The supporting protective film adhesive tape sequentially comprises an antistatic PET film, an antistatic acrylic acid pressure-sensitive adhesive layer, an oxidation coating, a PET film, a polyolefin pressure-sensitive adhesive layer and a double-sided antistatic PET release film from top to bottom. Wherein the oxidation coating and the polyolefin pressure-sensitive adhesive provide excellent water-blocking and oxygen-blocking performance for the supporting protective film and reduce the dielectric constant of the adhesive layer at the same time, so that the flexible OLED display panel can be greatly protected; and meanwhile, the evaporation process in the manufacturing process of the OLED display module can be reduced, and the production efficiency of the OLED module is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display screens, and in particular to a supporting protective film tape and a preparation method thereof. Background Art

[0002] With the continuous development of display technology, personal wearables, 3D curved mobile phones and other electronic products, flexible OLED display screens are increasingly widely used. In the production process of OLED flexible screens, the PI substrate is formed by coating the slurry on the carrier glass, and then various light-emitting layers are evaporated on the surface of the PI substrate to form the OLED display panel area. The PI substrate carrier film of the OLED panel is detached from the glass plate by the laser lift-off (LLO) process. The PI substrate film that has been removed from the carrier glass by LLO is very thin. It is necessary to deposit a layer of oxide coating on the surface of the PI substrate by coating to play a role in blocking water and oxygen to prevent the influence of water and oxygen on the light-emitting layer. At the same time, the PI substrate cannot play a supporting role for the light-emitting layer, and it is easy to tear or curl, which leads to troubles in subsequent lamination operations. In the entire flexible OLED structure, there is a layer called the backplane film at the bottom, commonly known as the support protective film. The support protective film is attached to the back of the OLED panel and plays a reinforcing role. It is used to attach to the panel and supports and protects the panel to prevent the panel from rolling up and tearing. In addition, static electricity is easily generated in the copper rod friction experiment, which may cause the thin film transistor characteristics in the display module to shift, causing the transfer output curve to shift, thereby resulting in poor image quality in the display module after the copper rod friction experiment.

[0003] Therefore, it is urgent to provide a new support protective film tape to improve the above-mentioned shortcomings. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a support protective film tape and a preparation method thereof.

[0005] The present invention is achieved through the following technical solutions:

[0006] The first object of the present invention is to provide a support protective film tape, which comprises, from top to bottom: a first substrate layer, a first pressure-sensitive adhesive layer, an oxidation coating layer, a second substrate layer, a polyolefin pressure-sensitive adhesive layer and a release film layer;

[0007] The oxidation coating is a silicon oxide coating and / or an aluminum oxide coating. The silicon oxide coating includes a silicon dioxide coating; the main function is that the bond length of the inorganic material is smaller than the kinetic diameter of water and oxygen molecules, thereby forming an effective barrier layer on the coating surface.

[0008] The polyolefin pressure-sensitive adhesive in the polyolefin pressure-sensitive adhesive layer comprises, by weight, 40 to 80 parts of polyolefin resin, 20 to 50 parts of tackifying resin, 0.2 to 2 parts of antioxidant, and 100 to 400 parts of organic solvent.

[0009] In one embodiment of the present invention, the thickness of the oxidation coating is 200nm to 500nm;

[0010] And / or, the oxide coating is prepared by magnetron sputtering.

[0011] In one embodiment of the present invention, the polyolefin resin is selected from one or more of polybutyl rubber, SBS rubber and SIS rubber; the polyolefin resin can also be prepared from one or more of isobutylene, isoprene, butadiene and styrene.

[0012] In one embodiment of the present invention, the tackifying resin includes one or more of rosin resin, terpene resin, C5 series petroleum resin and C9 series petroleum resin.

[0013] In one embodiment of the present invention, the antioxidant is selected from one or more of antioxidant 1010 , antioxidant 1076 and antioxidant 168 .

[0014] In one embodiment of the present invention, the organic solvent is selected from one or more of ethyl acetate, toluene and No. 120 solvent oil.

[0015] In one embodiment of the present invention, the thickness of the polyolefin pressure-sensitive adhesive layer is 10 μm to 30 μm.

[0016] In one embodiment of the present invention, the first substrate layer is an antistatic PET film;

[0017] And / or, the transmittance of the first substrate layer is greater than 89%; the haze is less than 2%;

[0018] and / or, the thickness of the first substrate layer is 25 μm to 100 μm;

[0019] And / or, the second substrate layer is an antistatic PET film;

[0020] And / or, the transmittance of the second substrate layer is greater than 89%; the haze is less than 2%;

[0021] And / or, the thickness of the second substrate layer is 50 μm to 100 μm.

[0022] In one embodiment of the present invention, the first pressure-sensitive adhesive layer is an antistatic acrylic pressure-sensitive adhesive layer and / or an antistatic polyurethane pressure-sensitive adhesive; the thickness of the antistatic acrylic pressure-sensitive adhesive layer is 5 μm to 15 μm;

[0023] And / or, the release layer is a double-sided antistatic PET release film layer;

[0024] And / or, the surface resistance of the double-sided antistatic PET release film layer needs to be 10 6 ~10 10 Ω;

[0025] And / or, the thickness of the double-sided antistatic PET release film layer is 25 μm to 100 μm.

[0026] The second object of the present invention is to provide a method for preparing the support protective film tape, comprising the following steps:

[0027] (1) preparing a silicon dioxide coating on the surface of the second substrate layer by a magnetron sputtering method;

[0028] (2) coating a layer of polyolefin pressure-sensitive adhesive on the non-silicon dioxide coating surface of the second substrate layer obtained in step (1), and then laminating a double-sided antistatic PET release film;

[0029] (3) coating an antistatic acrylic pressure-sensitive adhesive layer on the first substrate layer, and then laminating it to the silicon dioxide coating surface of the second substrate layer obtained in step (1) to obtain the supporting protective tape.

[0030] The above technical solution of the present invention has the following advantages compared with the prior art:

[0031] The present invention provides a support protective film tape and a preparation method thereof. By forming an oxide coating on the surface of the support protective film by magnetron sputtering, the support protective film is given a water and oxygen barrier effect, the coating preparation process on the OLED panel PI substrate is reduced, and the yield rate is improved; the polyolefin pressure-sensitive adhesive with a low dielectric constant is selected, so that the support protective film has a higher insulation performance, blocks the transmission of static electricity to the OLED display panel transistor, reduces the influence of static electricity on it, and reduces the probability of poor picture of the display module after the copper rod friction. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0033] The present invention provides a support protective film tape, which comprises, from top to bottom, a first substrate layer, a first pressure-sensitive adhesive layer, an oxidation coating layer, a second substrate layer, a polyolefin pressure-sensitive adhesive layer and a release film layer;

[0034] The oxide coating is a silicon oxide coating and / or an aluminum oxide coating; the silicon oxide coating includes a silicon dioxide coating; the main function is that the bond length of the inorganic material is smaller than the kinetic diameter of water and oxygen molecules, thereby forming an effective barrier layer on the coating surface.

[0035] The polyolefin pressure-sensitive adhesive in the polyolefin pressure-sensitive adhesive layer comprises, by weight, 40 to 80 parts of polyolefin resin, 20 to 50 parts of tackifying resin, 0.2 to 2 parts of antioxidant, and 100 to 400 parts of organic solvent.

[0036] Furthermore, the thickness of the oxidation coating is 200nm to 500nm;

[0037] Furthermore, the oxide coating is prepared by magnetron sputtering.

[0038] Furthermore, the polyolefin resin is selected from one or more of polybutyl rubber, SBS rubber and SIS rubber; the polyolefin resin can also be prepared from one or more of isobutylene, isoprene, butadiene and styrene.

[0039] Furthermore, the tackifying resin includes one or more of rosin resin, terpene resin, C5 series petroleum resin and C9 series petroleum resin.

[0040] Furthermore, the antioxidant is selected from one or more of antioxidant 1010 , antioxidant 1076 and antioxidant 168 .

[0041] Furthermore, the organic solvent is selected from one or more of ethyl acetate, toluene and No. 120 solvent oil.

[0042] Furthermore, the thickness of the polyolefin pressure-sensitive adhesive layer is 10 μm to 30 μm.

[0043] Furthermore, the first substrate layer is an antistatic PET film;

[0044] Furthermore, the transmittance of the first substrate layer is greater than 89% and the haze is less than 2%;

[0045] Furthermore, the thickness of the first substrate layer is 25 μm to 100 μm;

[0046] Furthermore, the second substrate layer is an antistatic PET film;

[0047] Furthermore, the transmittance of the second substrate layer is greater than 89% and the haze is less than 2%;

[0048] Furthermore, the thickness of the second substrate layer is 50 μm to 100 μm.

[0049] Furthermore, the first pressure-sensitive adhesive layer is an antistatic acrylic pressure-sensitive adhesive layer and / or an antistatic polyurethane pressure-sensitive adhesive; the thickness of the antistatic acrylic pressure-sensitive adhesive layer is 5 μm to 15 μm;

[0050] Furthermore, the release layer is a double-sided antistatic PET release film layer;

[0051] Furthermore, the surface resistance of the double-sided antistatic PET release film layer needs to be 10 6 ~10 10 Ω;

[0052] Furthermore, the thickness of the double-sided antistatic PET release film layer is 25 μm to 100 μm.

[0053] In addition, the present invention provides a method for preparing a supporting protective film tape, and the specific steps are as follows:

[0054] (1) Selecting a 50-100 μm PET substrate surface and preparing a 200-500 nm thick silicon oxide coating by magnetron sputtering;

[0055] (2) A layer of polyolefin pressure-sensitive adhesive containing 40 to 80 parts of polyolefin resin, 20 to 50 parts of tackifying resin, 0.2 to 2 parts of antioxidant, and 100 to 400 parts of organic solvent is applied on the non-silicon oxide coating surface, with a thickness of 10 to 30 μm, and a double-sided antistatic PET release film is attached.

[0056] (3) A 5-15 μm antistatic acrylic pressure-sensitive adhesive layer is coated on the first substrate layer PET film and bonded to the surface of the silica PET substrate to obtain a support protective tape.

[0057] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods, and the materials, reagents, etc. used are all available from commercial sources unless otherwise specified.

[0058] Example 1

[0059] The present embodiment provides a supporting protective film tape, which has a multi-layer structure, including a first substrate layer of a 50μm optical-grade antistatic PET film layer, an 8μm antistatic acrylic pressure-sensitive adhesive layer, a 300nm silica coating prepared by magnetron sputtering, a second substrate layer of a 75μm optical-grade PET film layer, a 13μm polyolefin pressure-sensitive adhesive layer and a 50μm double-sided antistatic release film layer.

[0060] The raw materials of the polyolefin pressure-sensitive adhesive include, by weight percentage, 70 parts of polybutyl rubber, 30 parts of tackifying resin, 0.3 parts of antioxidant, and 300 parts of solvent toluene;

[0061] Among them, the first substrate layer antistatic PET film was purchased from Jiangyin Huamei Optoelectronics Technology Co., Ltd., HMX50TAG; the second substrate layer PET film layer was purchased from Suzhou Mitsubishi Film Technology Co., Ltd., T968J75C; the antistatic acrylic pressure-sensitive adhesive layer was selected from Lutian New Materials Co., Ltd. LT-0403A glue; the tackifying resin was FTR6100, the antioxidant was antioxidant 1010, and the polybutyl rubber was from Yanshan Petrochemical with a molecular weight of 20W.

[0062] This embodiment also provides a method for preparing a supporting protective film tape, comprising the following steps:

[0063] (1) selecting a 75 μm second substrate layer PET film surface to prepare a 300 nm thick silicon dioxide coating by magnetron sputtering;

[0064] (2) coating the non-silicon dioxide coating surface of the second substrate layer PET film obtained in step (1) with a layer of polyolefin pressure-sensitive adhesive containing 70 parts of polybutyl rubber, 30 parts of tackifying resin, 0.3 parts of antioxidant, and 300 parts of organic solvent, with a thickness of 13 μm, and then laminating a double-sided antistatic PET release film;

[0065] (3) A 8 μm antistatic acrylic pressure-sensitive adhesive layer is coated on the first substrate layer antistatic PET film and bonded to the surface of the PET substrate containing the silicon dioxide coating to prepare a support protective film tape.

[0066] Example 2

[0067] The present embodiment provides a supporting protective film tape, which has a multi-layer structure, including a first substrate layer of a 50μm optical-grade antistatic PET film layer, an 8μm antistatic acrylic pressure-sensitive adhesive layer, a 300nm silica coating prepared by magnetron sputtering, a second substrate layer of a 75μm optical-grade PET film layer, a 13μm polyolefin pressure-sensitive adhesive layer and a 50μm double-sided antistatic release film layer.

[0068] The raw materials of the polyolefin pressure-sensitive adhesive include, by weight percentage, 70 parts of polybutyl rubber, 30 parts of tackifying resin, 0.3 parts of antioxidant, and 300 parts of solvent toluene;

[0069] Among them, the antistatic acrylic pressure-sensitive adhesive layer is selected from LT-0403A glue of Lutian New Materials Co., Ltd.; the tackifying resin is FTR6100, the antioxidant is antioxidant 1010, and the polybutyl rubber is from Yanshan Petrochemical, with a molecular weight of 80W.

[0070] This embodiment also provides a method for preparing a supporting protective film tape, comprising the following steps:

[0071] (1) preparing a 300 nm thick silicon dioxide coating on the surface of a 75 μm optical grade PET film as a second substrate layer by magnetron sputtering;

[0072] (2) coating the non-silicon dioxide coating surface of the second substrate layer PET film obtained in step (1) with a layer of polyolefin pressure-sensitive adhesive containing 70 parts of polybutyl rubber, 30 parts of tackifying resin, 0.3 parts of antioxidant, and 300 parts of organic solvent, with a thickness of 13 μm, and laminating a double-sided antistatic PET release film;

[0073] (3) A 8 μm antistatic acrylic pressure-sensitive adhesive layer is coated on the first substrate layer antistatic PET film and bonded to the surface of the PET substrate containing the silicon dioxide coating to prepare a support protective film tape.

[0074] Example 3

[0075] This embodiment provides a support protective film tape, which is similar to Embodiment 1, except that: the thickness of the silicon dioxide coating is 500 nm;

[0076] The raw materials of polyolefin pressure-sensitive adhesive include: 40 parts of polybutyl rubber, 40 parts of tackifying resin, 0.2 parts of antioxidant, and 300 parts of solvent toluene;

[0077] The preparation method of the supporting protective film tape in this embodiment is similar to that in Embodiment 1.

[0078] Example 4

[0079] This embodiment provides a support protective film tape, which is similar to Embodiment 1, except that: the thickness of the silicon dioxide coating is 200 nm;

[0080] The raw materials of polyolefin pressure-sensitive adhesive include: 80 parts of polybutyl rubber, 20 parts of tackifying resin, 2 parts of antioxidant, and 400 parts of solvent toluene;

[0081] The preparation method of the supporting protective film tape in this embodiment is similar to that in Embodiment 1.

[0082] Example 5

[0083] This embodiment provides a support protective film tape, which is similar to Embodiment 1, except that: the thickness of the silicon dioxide coating is 300 nm;

[0084] The raw materials of polyolefin pressure-sensitive adhesive include: 50 parts of polybutyl rubber, 50 parts of tackifying resin, 0.5 parts of antioxidant, and 300 parts of solvent toluene;

[0085] The preparation method of the supporting protective film tape in this embodiment is similar to that in Embodiment 1.

[0086] Comparative Example 1

[0087] This comparative example provides a supporting protective film tape, which has a multi-layer structure, including a first substrate layer of a 50μm optical-grade antistatic PET film layer, an 8μm antistatic acrylic pressure-sensitive adhesive layer, a 0nm silica coating prepared by magnetron sputtering, a second substrate layer of a 75μm optical-grade PET film layer, a 13μm polyolefin pressure-sensitive adhesive layer and a 50μm double-sided antistatic release film layer.

[0088] The raw materials of the polyolefin pressure-sensitive adhesive include, by weight percentage, 70 parts of polybutyl rubber, 30 parts of tackifying resin, 0.3 parts of antioxidant, and 300 parts of solvent toluene;

[0089] Among them, the antistatic acrylic pressure-sensitive adhesive layer can be selected from LT-0403A glue of Lutian New Materials Co., Ltd.; the tackifying resin is FTR6100, the antioxidant is antioxidant 1010, and the polybutyl rubber is from Yanshan Petrochemical, with a molecular weight of 80W.

[0090] This comparative example also provides a method for preparing a supporting protective film tape, comprising the following steps:

[0091] (1) coating a layer of polyolefin pressure-sensitive adhesive containing 70 parts of polybutyl rubber, 30 parts of tackifying resin, 0.3 parts of antioxidant, and 300 parts of organic solvent on the surface of a 75 μm second substrate layer optical-grade PET film, with a thickness of 13 μm, and laminating a double-sided antistatic PET release film;

[0092] (3) A layer of 8 μm antistatic acrylic pressure-sensitive adhesive layer is coated on the first substrate layer antistatic PET film and attached to the other side of the second substrate layer optical grade PET film to prepare a support protective film tape.

[0093] Comparative Example 2

[0094] This comparative example provides a supporting protective film tape, which has a multi-layer structure, including a first substrate layer of a 50μm optical-grade antistatic PET film layer, an 8μm antistatic acrylic pressure-sensitive adhesive layer, a 1000nm silica coating prepared by magnetron sputtering, a second substrate layer of a 75μm optical-grade PET film layer, a 13μm polyolefin pressure-sensitive adhesive layer and a 50μm double-sided antistatic release film layer.

[0095] Calculated by weight percentage, the raw materials of the polyolefin pressure-sensitive adhesive include 70 parts of polybutyl rubber, 30 parts of tackifying resin B, 0.3 parts of antioxidant, and 300 parts of solvent toluene;

[0096] Among them, the antistatic acrylic pressure-sensitive adhesive layer can be selected from LT-0403A glue of Lutian New Materials Co., Ltd.; the tackifying resin is FTR6100, the antioxidant is antioxidant 1010, and the polybutyl rubber is from Yanshan Petrochemical, with a molecular weight of 80W.

[0097] This comparative example also provides a method for preparing a supporting protective film tape, comprising the following steps:

[0098] (1) preparing a 1000 nm thick silicon dioxide coating on the surface of a 75 μm optical grade PET film as a second substrate layer by magnetron sputtering;

[0099] (2) coating a layer of polyolefin pressure-sensitive adhesive containing 70 parts of polybutyl rubber, 30 parts of tackifying resin, 0.3 parts of antioxidant, and 300 parts of organic solvent on the non-silicon dioxide coating surface, with a thickness of 13 μm, and laminating a double-sided antistatic PET release film;

[0100] (3) A 8 μm antistatic acrylic pressure-sensitive adhesive layer is coated on the first substrate layer antistatic PET film and bonded to the surface of the PET substrate containing the silicon dioxide coating to prepare a support protective film tape.

[0101] Comparative Example 3

[0102] This comparative example provides a supporting protective film tape, which has a multi-layer structure, including a first substrate layer of a 50μm optical-grade antistatic PET film layer, an 8μm antistatic acrylic pressure-sensitive adhesive layer, a 0nm silica coating prepared by magnetron sputtering, a second substrate layer of a 75μm optical-grade PET film layer, a 13μm polyacrylic pressure-sensitive adhesive layer and a 50μm double-sided antistatic release film layer.

[0103] Among them, the antistatic acrylic pressure-sensitive adhesive layer can be selected from LT-0403A glue produced by Lutian New Materials Co., Ltd.; the polyacrylic acid pressure-sensitive adhesive is 838 glue produced by Nanjing Zongyan New Materials.

[0104] This comparative example also provides a method for preparing a supporting protective film tape, comprising the following steps:

[0105] (1) coating a polyacrylic acid pressure-sensitive adhesive layer on the surface of a 75 μm second substrate optical-grade PET film with a thickness of 13 μm, and laminating a double-sided antistatic PET release film;

[0106] (3) A layer of 8 μm antistatic acrylic pressure-sensitive adhesive layer is coated on the first substrate layer antistatic PET film and attached to the other side of the second substrate layer optical grade PET film to prepare a support protective film tape.

[0107] Performance Testing

[0108] The present invention performs the following performance tests on the above embodiments and comparative examples:

[0109] (1) Adhesion test: Test the second substrate layer + thermosetting substrate layer + acrylic pressure-sensitive adhesive layer, then cut the sample into 25 mm wide × 200 mm long; fit it on the glass board, and use the pressing device to slowly reciprocate three times for rolling. After leaving it for 20 minutes, install the test board on the tensile testing machine, bend the lower part of the sample 180°, fix it on the upper chuck, and then peel it off at a speed of 300 mm / min. The peeling length is more than 100 mm, and its strength is automatically recorded on the recording paper. The same sample should be measured three times in parallel.

[0110] (2) High temperature static shear: The high temperature static shear test is performed at 80°C with a 1000g weight. (According to the test method GB / T 4851-2014).

[0111] (3) Film tearing static voltage / surface resistance: the test method refers to GB / T 33375-2016.

[0112] (4) Water vapor transmission rate test: Tested by a water vapor transmission rate tester.

[0113] The test results of the embodiments and comparative examples are shown in Table 1:

[0114] Table 1

[0115]

[0116]

[0117] From the test results in Table 1 above, it can be found that in Example 1 and Example 2, the polyolefin has a high molecular weight, good cohesion, and small static shear force displacement. The water vapor and oxygen permeability of the support protective film without magnetron sputtering silica coating on the PET surface is relatively high; as the thickness of the silica coating increases, the water vapor and oxygen permeability decreases slightly, but the coating adhesion becomes worse. Polyolefin pressure-sensitive adhesives have a low dielectric constant and high surface resistance. The support protective film has a high insulation performance, which blocks the transmission of static electricity to the OLED display panel transistor, reduces the impact of static electricity on it, and reduces the probability of poor picture quality in the display module after copper rod friction.

[0118] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A support protective film tape, characterized in that: From top to bottom: a first substrate layer, a first pressure-sensitive adhesive layer, an oxidation coating layer, a second substrate layer, a polyolefin pressure-sensitive adhesive layer and a release film layer; The oxide coating is a silicon oxide coating and / or an aluminum oxide coating; The polyolefin pressure-sensitive adhesive in the polyolefin pressure-sensitive adhesive layer comprises, by weight, 40 to 80 parts of polyolefin resin, 20 to 50 parts of tackifying resin, 0.2 to 2 parts of antioxidant, and 100 to 400 parts of organic solvent.

2. The support protective film tape according to claim 1, characterized in that: The thickness of the oxidation coating is 200nm-500nm.

3. The support protective film tape according to claim 1, characterized in that: The polyolefin resin is selected from one or more of polybutyl rubber, SBS rubber and SIS rubber.

4. The support protective film tape according to claim 1, characterized in that: The tackifying resin includes one or more of rosin resin, terpene resin, C5 series petroleum resin and C9 series petroleum resin.

5. The support protective film tape according to claim 1, characterized in that: The antioxidant is selected from one or more of antioxidant 1010 , antioxidant 1076 and antioxidant 168 .

6. The support protective film tape according to claim 1, characterized in that: The organic solvent is selected from one or more of ethyl acetate, toluene and No. 120 solvent oil.

7. The support protective film tape according to claim 1, characterized in that: The thickness of the polyolefin pressure-sensitive adhesive layer is 10 μm to 30 μm.

8. The support protective film tape according to claim 1, characterized in that: The first substrate layer is an antistatic PET film with a transmittance greater than 89% and a haze less than 2%; and / or, the thickness of the first substrate layer is 25 μm to 100 μm; And / or, the second substrate layer is an antistatic PET film with a transmittance greater than 89% and a haze less than 2%; And / or, the thickness of the second substrate layer is 50 μm to 100 μm.

9. The support protective film tape according to claim 1, characterized in that: The first pressure-sensitive adhesive layer is an antistatic acrylic pressure-sensitive adhesive layer and / or an antistatic polyurethane pressure-sensitive adhesive; the thickness of the antistatic acrylic pressure-sensitive adhesive layer is 5 μm to 15 μm; And / or, the release layer is a double-sided antistatic PET release film layer; And / or, the surface resistance of the double-sided antistatic PET release film layer is 10 6 Ω~10 10 Ω; And / or, the thickness of the double-sided antistatic PET release film layer is 25 μm to 100 μm.

10. The method for preparing the support protective film tape according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) preparing a silicon dioxide coating on the surface of the second substrate layer by a magnetron sputtering method; (2) coating the non-silicon dioxide coating surface of the second substrate layer obtained in step (1) with a layer of polyolefin pressure-sensitive adhesive, and then laminating a double-sided antistatic PET release film; (3) coating an antistatic acrylic pressure-sensitive adhesive layer on the first substrate layer, and then laminating it to the silicon dioxide coating surface of the second substrate layer obtained in step (1) to obtain the supporting protective tape.

Images