A support protective film adhesive tape and a method for manufacturing the same

Abstract

The present application relates to a kind of support protective film adhesive tape and its preparation method.The support protective film adhesive tape of the present application is in order from top to bottom antistatic PET film, antistatic acrylic pressure-sensitive adhesive layer, oxidation coating, PET film, polyolefin pressure-sensitive adhesive layer and double-sided antistatic PET release film.The oxidation coating and polyolefin pressure-sensitive adhesive provide excellent water and oxygen barrier properties for support protective film and simultaneously reduce the dielectric constant of the adhesive layer, which can greatly protect flexible OLED display panel;At the same time, it can reduce the evaporation process in OLED display module process, greatly improve the production efficiency of OLED module.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display screen, in particular to a supporting protective film adhesive tape and a preparation method thereof. BACKGROUND

[0002] With the continuous development of display technology, personal wear, 3D curved surface mobile phone and other electronic products, flexible OLED display screen is applied more and more widely. In the production process of OLED flexible screen, the PI substrate is formed by coating slurry on the carrier glass, and then various light emitting layers are evaporated on the surface of the PI substrate to form an OLED display panel area. The PI substrate carrier film of the OLED panel is separated from the glass plate by a laser stripping (LLO) process. The PI substrate film that has been removed from the carrier glass is very thin. It is necessary to deposit an oxidation coating on the surface of the PI substrate by plating to prevent water and oxygen, so as to avoid the influence of water and oxygen on the light emitting layer. At the same time, the PI substrate cannot support the light emitting layer, and it is easy to tear or curl, which causes problems in subsequent operations such as lamination. In the entire flexible OLED structure, there is a layer of back plate film at the bottom, which is also called supporting protective film. The supporting protective film is attached to the back of the OLED panel and plays a reinforcing role. It is used for lamination with the panel and plays a supporting and protective role for the panel to prevent the panel from curling and tearing. And static electricity is easy to produce in the copper bar rubbing experiment, which may cause the characteristics of the thin film transistor in the display module to deviate, so that the transfer output curve deviates, resulting in poor display module after the copper bar rubbing experiment.

[0003] Therefore, it is urgent to provide a new supporting protective film adhesive tape to improve the above-mentioned shortcomings. SUMMARY

[0004] To solve the above technical problems, the present application provides a supporting protective film adhesive tape and a preparation method thereof.

[0005] The present application is realized by the following technical solutions:

[0006] The first object of the present application is to provide a supporting protective film adhesive 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 layer is a silicon oxide coating layer and / or an aluminum oxide coating layer. The silicon oxide coating layer includes a silicon dioxide coating layer. The main role is that the bond length of inorganic materials is smaller than the kinetic diameter of water and oxygen molecules, so as to form an effective barrier layer on the surface of the coating.

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

[0009] In one embodiment of the present application, the thickness of the oxidation coating is 200-500 nm.

[0010] In one embodiment of the present application, the oxidation coating is prepared by magnetron sputtering.

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

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

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

[0014] In one embodiment of the present application, the organic solvent is selected from one or more of ethyl acetate, toluene, and 120# solvent oil.

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

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

[0017] In one embodiment of the present application, the first substrate layer has a transmittance > 89% and a haze < 2%.

[0018] In one embodiment of the present application, the thickness of the first substrate layer is 25-100 μm.

[0019] In one embodiment of the present application, the second substrate layer is an antistatic PET film.

[0020] In one embodiment of the present application, the second substrate layer has a transmittance > 89% and a haze < 2%.

[0021] In one embodiment of the present application, the thickness of the second substrate layer is 50-100 μm.

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

[0023] and / or, the release layer is a double-sided anti-static PET release film layer;

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

[0025] and / or, the thickness of the double-sided anti-static PET release film layer is 25 μm ~ 100 μm.

[0026] The second object of the present application is to provide a preparation method of the support protection film adhesive tape, comprising the following steps:

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

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

[0029] (3) coating an anti-static acrylic pressure-sensitive adhesive layer on the first substrate layer, and then bonding the silicon dioxide coating surface of the second substrate layer obtained in step (1), to obtain the support protection film adhesive tape.

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

[0031] The present application provides a support protection film adhesive tape and a preparation method thereof. By forming an oxidation coating layer on the surface of the support protection film by a magnetron sputtering method, the support protection film is endowed with water and oxygen blocking effect, the film preparation process on the OLED panel PI substrate is reduced, and the yield is improved. The polyolefin pressure-sensitive adhesive has low dielectric constant, and the support protection film has high insulation performance, which blocks the transmission of static electricity to the OLED display panel transistor, reduces the influence of static electricity, and reduces the probability of display module picture failure after copper bar rubbing. DETAILED DESCRIPTION

[0032] The present application will be further described below in conjunction with specific examples, so that those skilled in the art can better understand the present application and implement it. The examples are not limiting to the present application.

[0033] The present application provides a support protection film adhesive 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 oxidation coating is a silicon oxide coating and / or an aluminum oxide coating; the silicon oxide coating includes a silicon dioxide coating; the main role is that the bond length of inorganic material is smaller than the kinetic diameter of water and oxygen molecules, thereby forming an effective barrier layer on the surface of the coating.

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

[0036] Further, the thickness of the oxidation coating is 200-500 nm.

[0037] Further, the oxidation coating is prepared by magnetron sputtering.

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

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

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

[0041] Further, the organic solvent is selected from one or more of ethyl acetate, toluene, and 120# solvent oil.

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

[0043] Further, the first substrate layer is an antistatic PET film.

[0044] Further, the transmittance of the first substrate layer is > 89%, and the haze is < 2%.

[0045] Further, the thickness of the first substrate layer is 25-100 μm.

[0046] Further, the second substrate layer is an antistatic PET film.

[0047] Further, the transmittance of the second substrate layer is > 89%, and the haze is < 2%.

[0048] Further, the thickness of the second substrate layer is 50-100 μm.

[0049] Further, 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 5-15 microns;

[0050] Further, the release layer is a double-sided antistatic PET release film layer.

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

[0052] Further, the thickness of the double-sided antistatic PET release film layer is 25-100 microns.

[0053] In addition, the application provides a preparation method of the support protection film adhesive tape, and the specific steps are as follows:

[0054] (1) A 50-100 micron PET substrate surface is prepared with a 200-500 nm thick silicon oxide coating layer by a magnetron sputtering method.

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

[0056] (3) A 5-15 micron antistatic acrylic pressure-sensitive adhesive layer is coated on the first substrate layer PET film and attached to the silicon dioxide PET substrate surface to obtain the support protection adhesive tape.

[0057] The experimental methods used in the following examples are conventional methods, and the materials, reagents, etc. used are commercially available unless otherwise specified.

[0058] Example 1

[0059] The example provides a support protection film adhesive tape, which is a multilayer structure, including a first substrate layer 50 micron optical grade antistatic PET film layer, an 8 micron antistatic acrylic pressure-sensitive adhesive layer, a 300 nm silicon dioxide coating layer prepared by magnetron sputtering, a second substrate layer 75 micron optical grade PET film layer, a 13 micron polyolefin pressure-sensitive adhesive layer, and a 50 micron double-sided antistatic release film layer.

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

[0061] The first substrate layer is an anti-static PET film purchased from Jiangyin Huameiguang Technology Co., Ltd., HMX50TAG; the second substrate layer is a PET film purchased from Suzhou Mitsubishi Film Technology Co., Ltd., T968J75C; the anti-static acrylic pressure-sensitive adhesive layer is selected from LT-0403A glue of Lvtian New Material Co., Ltd.; the tackifying resin is FTR6100, the antioxidant is antioxidant 1010, and the polybutyl rubber is Yanshan Petrochemical, with a molecular weight of 20W.

[0062] The embodiment also provides a preparation method of the support protection film adhesive tape, including the following steps:

[0063] (1) a 75-micron-thick second substrate layer PET film is selected, and a 300-nm-thick silicon dioxide coating is prepared on the surface of the second substrate layer PET film by a magnetron sputtering method;

[0064] (2) a 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 is coated on the non-silicon dioxide coating surface of the second substrate layer PET film obtained in step (1) to a thickness of 13 microns, and then a double-sided anti-static PET release film is attached;

[0065] (3) an 8-micron-thick anti-static acrylic pressure-sensitive adhesive layer is coated on the first substrate layer anti-static PET film to be attached to the PET substrate surface containing the silicon dioxide coating, so as to obtain the support protection film adhesive tape.

[0066] Embodiment 2

[0067] The embodiment provides a support protection film adhesive tape, which is a multilayer structure and includes a first substrate layer of a 50-micron-thick optical-grade anti-static PET film layer, an 8-micron-thick anti-static acrylic pressure-sensitive adhesive layer, a 300-nm-thick silicon dioxide coating prepared by a magnetron sputtering method, a second substrate layer of a 75-micron-thick optical-grade PET film layer, a 13-micron-thick polyolefin pressure-sensitive adhesive layer, and a 50-micron-thick double-sided anti-static release film layer.

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

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

[0070] The embodiment also provides a preparation method of the support protection film adhesive tape, including the following steps:

[0071] (1) A 300 nm thick silicon dioxide coating was prepared on the surface of a 75 μm second substrate optical grade PET film by magnetron sputtering.

[0072] (2) A layer of polyolefin pressure-sensitive adhesive containing 70 parts polybutyl rubber, 30 parts tackifying resin, 0.3 parts antioxidant and 300 parts organic solvent is coated on the non-silica coating surface of the second substrate layer PET film obtained in step (1), and its thickness is controlled at 13 μm. Double-sided antistatic PET release film is then laminated.

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

[0074] Example 3

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

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

[0077] The preparation method of the 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, similar to Embodiment 1, except that the thickness of the silicon dioxide coating is 200nm;

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

[0081] The preparation method of the 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, similar to Embodiment 1, except that the thickness of the silicon dioxide coating is 300nm;

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

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

[0086] Comparative Example 1

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

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

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

[0090] The comparative example also provides a preparation method of a support protective film adhesive tape, including the following steps.

[0091] (1) A 75-μm second substrate layer of optical-grade PET film is coated 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 controlled at 13 μm, and is attached to a double-sided antistatic PET release film.

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

[0093] Comparative Example 2

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

[0095] The raw materials of the polyolefin pressure-sensitive adhesive include, in terms of mass percentage, 70 parts of polybutyl rubber, 30 parts of tackifying resin B, 0.3 parts of antioxidant, and 300 parts of solvent toluene.

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

[0097] The present comparative example also provides a preparation method of the support protective film adhesive tape, comprising the following steps:

[0098] (1) The surface of the second substrate layer of 75 μm optical grade PET film is selected to prepare a 1000 nm thick silicon dioxide coating layer by a magnetron sputtering method;

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

[0100] (3) An 8 μm thick antistatic acrylic pressure-sensitive adhesive layer is coated on the first substrate layer of the antistatic PET film and attached to the surface of the PET substrate containing the silicon dioxide coating layer, thereby obtaining the support protective film adhesive tape.

[0101] Comparative Example 3

[0102] The present comparative example provides a support protective film adhesive tape, which has a multilayer structure and comprises a first substrate layer of 50 μm optical grade antistatic PET film, an 8 μm thick antistatic acrylic pressure-sensitive adhesive layer, a 0 nm thick silicon dioxide coating layer prepared by a magnetron sputtering method, a second substrate layer of 75 μm optical grade PET film, a 13 μm thick polyacrylic pressure-sensitive adhesive layer and a 50 μm thick double-sided antistatic release film.

[0103] The antistatic acrylic pressure-sensitive adhesive layer can be selected from LT-0403A glue from Lü Tian New Material Co., Ltd., and the polyacrylic pressure-sensitive adhesive is 838 glue from Nanjing Zongyan New Material Co., Ltd.

[0104] The present comparative example also provides a preparation method of the support protective film adhesive tape, comprising the following steps:

[0105] (1) The surface of the second substrate layer of 75 μm optical grade PET film is selected to prepare a 1000 nm thick silicon dioxide coating layer by a magnetron sputtering method;

[0106] (3) An 8 μm thick antistatic acrylic pressure-sensitive adhesive layer is coated on the first substrate layer of the antistatic PET film and attached to the surface of the second substrate layer of the optical grade PET film, thereby obtaining the support protective film adhesive tape.

[0107] Performance test

[0108] The above examples and comparative examples are subjected to the following performance tests:

[0109] (1) Adhesion test: test the second substrate layer + heat-settable substrate layer + acrylic pressure-sensitive adhesive layer, then cut the sample into 25 mm wide x 200 mm long; adhere to the glass plate, slowly reciprocate three times with a pressing device, and place for 20 minutes. Then, put the test plate on the tensile testing machine, fold the lower part of the sample 180°, fix it on the upper clamp, and then peel off at a speed of 300 mm / min. The peeling length is more than 100 mm, and the strength is automatically recorded on the recording paper. The same sample should be measured three times in parallel.

[0110] (2) High temperature static shear: high temperature static shear test is carried out at 80°C with a 1000g weight. (According to 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 water vapor transmission rate tester.

[0113] The test results of the examples 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 high molecular weight and good cohesion, and the static shear displacement is small. The water vapor and oxygen transmission rate of the support protection film without a magnetron sputtered silicon dioxide coating on the PET surface is relatively high; with the increase of the thickness of the silicon dioxide coating, the water vapor and oxygen transmission rate slightly decreases, but the coating adhesion becomes poor. The polyolefin pressure-sensitive adhesive has low dielectric constant and high surface resistance, and the support protection film has high insulation performance, which 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 display module picture failure after copper bar friction.

[0118] Obviously, the above examples are only examples for clarity and do not limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and impossible to exhaust all embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A protective film tape, characterized in that, From top to bottom, they are: first substrate layer, first pressure-sensitive adhesive layer, oxide coating, second substrate layer, polyolefin pressure-sensitive adhesive layer, and release film layer; The oxide coating is a silicon dioxide coating and / or an aluminum oxide coating; The polyolefin pressure-sensitive adhesive layer comprises, by weight, 40-80 parts of polyolefin resin, 20-50 parts of tackifying resin, 0.2-2 parts of antioxidant, and 100-400 parts of organic solvent. A silicon dioxide coating is prepared on the surface of the second substrate layer by magnetron sputtering. The thickness of the oxide coating is 200nm~500nm; The first substrate layer is an antistatic PET film; the second substrate layer is an antistatic PET film; The first pressure-sensitive adhesive layer is an antistatic acrylic pressure-sensitive adhesive layer and / or an antistatic polyurethane pressure-sensitive adhesive; the release film layer is a double-sided antistatic PET release film layer.

2. The supporting 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.

3. The supporting 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.

4. The supporting 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.

5. The supporting 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.

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

7. The supporting protective film tape according to claim 1, characterized in that, The first substrate layer has a transmittance > 89% and a haze < 2%. And / or, the thickness of the first substrate layer is 25μm~100μm; And / or, the transmittance of the second substrate layer is >89%; Haze <2%; And / or, the thickness of the second substrate layer is 50μm~100μm.

8. The supporting protective film tape according to claim 1, characterized in that, The thickness of the antistatic acrylic pressure-sensitive adhesive layer is 5μm~15μm; And / or, the surface resistance of the double-sided antistatic PET release film layer is 10 Ω·cm. 6 Ω~10 10 Ω; And / or, the thickness of the double-sided antistatic PET release film layer is 25μm~100μm.

9. The method for preparing the support protective film tape according to any one of claims 1-8, characterized in that, Includes the following steps: (1) A silicon dioxide coating is prepared on the surface of the second substrate layer by magnetron sputtering; (2) A layer of polyolefin pressure-sensitive adhesive is applied to the non-silica coating surface of the second substrate layer obtained in step (1), and then double-sided antistatic PET release film is laminated. (3) Apply an antistatic acrylic pressure-sensitive adhesive layer to the first substrate layer, and then attach it to the silica coating surface of the second substrate layer obtained in step (1) to obtain the support and protective tape.

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