High-viscosity liquid, support film, preparation method of high-viscosity liquid and preparation method of support film, and OLED module

Abstract

The embodiment of the invention provides high-viscosity glue, a supporting film, a preparation method and an OLED module, and relates to the technical field of high polymer material films. The high-viscosity liquid comprises the following components in parts by weight: modified acrylic resin, a solvent, a surface additive, an additive and a curing agent; wherein the Tg of the modified acrylic resin is-60 to-30 DEG C, the molecular weight of the modified acrylic resin is 20-80 thousand, and the storage modulus of the modified acrylic resin is 0.1-0.15 Mpa; the surface auxiliary agent comprises polyester modified polydimethylsiloxane; the additive comprises transparent polyethyleneimine with the molecular weight of 50000-50000. The supporting film comprises a body release layer, a body adhesive layer, a body base material layer, a back protection adhesive layer and a back protection base material layer which are sequentially stacked from bottom to top, wherein the body adhesive layer is formed by coating and curing the high-viscosity liquid. The adhesive layer formed by the high-viscosity adhesive liquid is excellent in adhesiveness and good in aging resistance, the supporting film can stably play a supporting and protecting role, and the working stability of the OLED module is improved.

Description

Technical Field

[0001] The present application relates to the technical field of polymer material films, and in particular to a high-viscosity adhesive liquid, a support film, a preparation method and an OLED module. Background Art

[0002] In the field of polymer thin film technology, OLED (Organic Light-Emitting Diode) module is an important optoelectronic display technology. OLED module usually includes multiple components such as upper cover glass, OLED light-emitting layer, lower support film, etc. Among them, the lower support film is an important component of the OLED module. Its main function is to support the OLED light-emitting layer to prevent the OLED light-emitting layer from being deformed or damaged due to its own weight. It also plays a role in preventing abnormalities in the subsequent process of the OLED module.

[0003] The existing lower support film has a glue layer for sticking to the OLED light-emitting layer, but this glue layer has some problems in practical applications: the adhesiveness of the glue layer is difficult to meet high requirements, and the stability needs to be improved; the aging resistance of the glue layer of the support film is insufficient, especially in harsh environments such as long-term high temperature and high humidity, the cohesion of the glue layer is easy to decrease, resulting in insufficient adhesion. The above problems are prone to peeling and falling off of the glue layer, resulting in the failure of the support function of the lower support film, which has an adverse effect on the working stability of the OLED module.

[0004] Therefore, the lower support film of the existing OLED module has obvious deficiencies in adhesion and aging resistance, and needs to be further improved. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a high-viscosity adhesive liquid, a support film, a preparation method and an OLED module. The adhesive layer has excellent adhesion and good aging resistance. The support film can stably play a supporting and protective role, thereby improving the working stability of the OLED module.

[0006] In a first aspect, the embodiment of the present application provides a high viscosity adhesive liquid, which includes, by weight: 90 to 100 parts of modified acrylic resin, 50 to 90 parts of solvent, 0.05 to 1 part of surface additive, 0.01 to 0.2 parts of additive, and 0.05 to 5 parts of curing agent;

[0007] The modified acrylic resin has a Tg of -60 to -30°C, a molecular weight of 200,000 to 800,000, and a storage modulus of 0.1 to 0.15 MPa; the surface additive includes polyester-modified polydimethylsiloxane; and the additive includes polyethyleneimine with a molecular weight of 50,000 to 90,000.

[0008] In the above technical scheme, the high-viscosity adhesive liquid corresponding to the formation of the adhesive layer contains a high-temperature resistant silicone surface additive polyester modified polydimethylsiloxane, which has high thermal stability, is suitable for thermosetting adhesive liquid systems, and improves aging resistance; and the surface additive can significantly reduce the surface tension of the adhesive liquid, increase the wetting of the adhesive liquid to the substrate layer, prevent coating shrinkage holes, and effectively improve the adhesion of the adhesive layer.

[0009] The high viscosity adhesive also contains polyethyleneimine as an additive, which further improves the adhesion of the adhesive layer. The amine groups in polyethyleneimine can form hydrogen bonds with the hydroxyl groups in the substrate layer, and can also form ionic bonds with the carboxyl groups and other strong polar groups on the surface of the substrate layer after corona or plasma treatment, thereby enhancing the bonding between the adhesive and the substrate layer, and can solve the problem of poor adhesion caused by the substrate layer being left for attenuation or failure after corona or plasma treatment. In addition, the additive polyethyleneimine contains highly reactive primary and secondary amine groups, which can react with the epoxy compounds in the adhesive, increasing the aging resistance of the adhesive layer and maintaining long-term stable adhesion of the adhesive layer.

[0010] In a possible implementation, the solvent includes a mixture of one or more of ethyl acetate, butyl acetate, acetone, butanone, and toluene;

[0011] The curing agent includes one or more mixtures of diisocyanate, polyisocyanate, modified polyisocyanate, epoxy compound, and modified epoxy compound.

[0012] In the second aspect, an embodiment of the present application provides a support film, which includes a main body release layer, a main body adhesive layer, a main body substrate layer, a back adhesive layer and a back substrate layer stacked in sequence from bottom to top, and the main body adhesive layer is formed by coating and curing the high-viscosity adhesive liquid provided in the first aspect.

[0013] In the above technical solution, the adhesive layer has excellent adhesion and good aging resistance, and the formed support film can stably play a supporting and protective role.

[0014] In a possible implementation, the thickness of the main adhesive layer is 10 to 20 μm, and the surface impedance is 10 12 ~10 16 Ω, peel force>1000gf / 25mm.

[0015] In a possible implementation, the thickness of the main substrate layer is 23-150 μm, the transmittance is ≥90%, and the haze is ≤2%; the thermal shrinkage after baking at 150° C. for 30 min is <0.3% in the TD direction and <0.8% in the MD direction;

[0016] The main substrate layer has an antistatic layer on one side, and the antistatic layer is close to the backing adhesive layer. The thickness of the antistatic layer is 0.02-0.1 μm, and the impedance value is 10 4~10 7 Ω;

[0017] The main substrate layer is subjected to double-sided plasma or corona surface treatment, and the double-sided surface tension is ≥42 dyne / cm.

[0018] In the above technical scheme, the main substrate layer is an optical film with high transmittance, low heat shrinkage, single-sided antistatic, and double-sided plasma or corona surface treatment; the surface tension of the main substrate layer is relatively high, and it is matched with a surface additive that significantly reduces the surface tension of the adhesive, thereby increasing the wetting of the adhesive on the main substrate layer, preventing coating shrinkage holes, and effectively improving the adhesion of the adhesive layer.

[0019] In a possible implementation, the thickness of the main release layer is 25 to 50 μm, the release force at room temperature is 5 to 15 g / 25 mm, and the release surface impedance is 10 4 ~10 9 Ω, non-release surface impedance is 10 4 ~10 7 Ω.

[0020] In a possible implementation, the thickness of the back protection substrate layer is 23 to 50 μm;

[0021] Both sides of the back protection substrate layer have an antistatic layer, the thickness of the antistatic layer is 0.01 to 0.05 μm, and the surface impedance value is 10 4 ~10 9 Ω;

[0022] The surface of the back-protecting substrate layer close to the back-protecting adhesive layer is subjected to corona treatment, and the surface tension is ≥38 dyne / cm.

[0023] In a possible implementation, the thickness of the backing adhesive layer is 8 to 15 μm, and the surface impedance is 10 9 ~10 11 Ω, peeling force is 4~10gf / 25mm;

[0024] The components of the low-viscosity adhesive liquid corresponding to the backing adhesive layer include, by weight: 80-100 parts of acrylic resin, 0.5-3 parts of ionic liquid antistatic agent, 0.01-0.2 parts of accelerator, 0.5-1.5 parts of retarder, 60-100 parts of solvent, and 1-3 parts of curing agent.

[0025] In a third aspect, an embodiment of the present application provides a method for preparing the support membrane provided in the second aspect, which comprises the following steps:

[0026] A high viscosity adhesive liquid is coated on one side of the main substrate layer, and after heating and curing, the main release layer is laminated and subjected to a aging treatment to obtain a support film main body;

[0027] A low-viscosity adhesive is coated on one side of the backing substrate layer, and after being heated and cured, a release film is laminated, and a curing treatment is performed. The release film is torn off and transferred to the other side of the main substrate layer of the supporting film body.

[0028] In a fourth aspect, an embodiment of the present application provides an OLED module, comprising an upper cover glass, an OLED light-emitting layer, and a lower support film stacked in sequence from top to bottom, wherein the lower support film is the support film provided by the second aspect and the main body release layer is torn off, and the main body adhesive layer is used to adhere to the OLED light-emitting layer.

[0029] In the above technical solution, the lower supporting film can stably play a supporting and protective role, thereby improving the working stability of the OLED module. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of the structure of a support membrane provided in an embodiment of the present application.

[0032] Icon: 111-main body substrate layer; 112-main body adhesive layer; 113-main body release layer; 121-back protection substrate layer; 122-back protection adhesive layer. DETAILED DESCRIPTION

[0033] In the field of polymer thin film technology, OLED (Organic Light-Emitting Diode) module is an important optoelectronic display technology. OLED module usually includes multiple components such as upper cover glass, OLED light-emitting layer, lower support film, etc. Among them, the lower support film is an important component of the OLED module. Its main function is to support the OLED light-emitting layer to prevent the OLED light-emitting layer from being deformed or damaged due to its own weight. It also plays a role in preventing abnormalities in the subsequent process of the OLED module.

[0034] The existing lower support film usually consists of two parts, namely the support film body and the back protective film of the support film body. The support film body is mainly made of a high-viscosity layer, which provides sufficient adhesion to ensure that the support film can be stably attached to the PI substrate of the OLED light-emitting layer without falling off or separation of the adhesive layer, thereby supporting the flexible PI substrate and preventing curling. The back protective film is usually made of an adhesive layer with low tearing force, and its main purpose is to protect the support film body and avoid damage in subsequent processing.

[0035] Since the lower support film needs to have high adhesion and be stably attached to the PI substrate and ensure that it will not fall off, in order to play a supporting and anti-curling role, there are high requirements for the adhesion of the support film adhesive layer, but the adhesion of the existing adhesive layer is difficult to meet the high requirements. In addition, the existing adhesive layer is not resistant to aging, especially in harsh environments such as long-term high temperature and high humidity, the cohesion of the adhesive layer is easy to decrease, resulting in insufficient adhesion. Therefore, it is necessary to improve the adhesive layer to improve its adhesion and aging resistance.

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0037] The high viscosity adhesive liquid, support film, preparation method and OLED module of the embodiments of the present application are described in detail below.

[0038] The embodiment of the present application provides a high viscosity adhesive solution, which includes, by weight: 90 to 100 parts of modified acrylic resin, 50 to 90 parts of solvent, 0.05 to 1 part of surface additive, 0.01 to 0.2 parts of additive, and 0.05 to 5 parts of curing agent;

[0039] The modified acrylic resin has a Tg of -60 to -30°C, a molecular weight of 200,000 to 800,000, and a storage modulus of 0.1 to 0.15 MPa.

[0040] The surface additive includes an organosilicon surface additive, specifically a polyester-modified polydimethylsiloxane of a high temperature resistant system. For example, the surface additive is BYK-314 from BYK Chemical.

[0041] The additive includes transparent polyethyleneimine with a molecular weight of 50,000 to 90,000. For example, the additive is Nippon Shokubai EPOMIN P-1050.

[0042] In one possible implementation, the solvent includes a mixture of one or more (at least two) of ethyl acetate, butyl acetate, acetone, butanone, and toluene; illustratively, the solvent is a mixture of ethyl acetate:toluene in a mass ratio of 7:3.

[0043] The curing agent includes one or more (at least two) of diisocyanate, polyisocyanate, modified polyisocyanate, epoxy compound, and a mixture of modified epoxy compounds. Exemplarily, the curing agent is an aliphatic multifunctional epoxy resin.

[0044] Please see Figure 1 An embodiment of the present application provides a support film, which includes a main body release layer 113, a main body adhesive layer 112, a main body substrate layer 111, a backing adhesive layer 122 and a backing substrate layer 121 stacked in sequence from bottom to top, and the main body adhesive layer 112 is formed by coating and curing the high-viscosity adhesive liquid of the aforementioned embodiment.

[0045] In the embodiment of the present application, the main body adhesive layer 112 is an acrylic adhesive layer. In a possible implementation, the thickness of the main body adhesive layer 112 is 10 to 20 μm, and the surface impedance is 10 12 ~10 16 Ω, peel force>1000gf / 25mm.

[0046] In the embodiment of the present application, the main substrate layer 111 is selected from an optical substrate with high transmittance, low heat shrinkage, single-sided antistatic, double-sided plasma or corona surface treatment. In a possible implementation, the thickness of the main substrate layer 111 is 23-150 μm, the transmittance is ≥90%, and the haze is ≤2%; the heat shrinkage rate of baking at 150°C for 30 minutes is less than 0.3% in the TD direction and less than 0.8% in the MD direction; the main substrate layer 111 has an antistatic layer on one side, and the antistatic layer is close to the backing adhesive layer 122, the thickness of the antistatic layer is 0.02-0.1 μm, and the impedance value is 10 4 ~10 7 Ω; the main substrate layer 111 is subjected to double-sided plasma or corona surface treatment, and the double-sided surface tension is ≥42 dyne / cm. For example, the main substrate layer 111 is a model of Toray 75QTS2.

[0047] In a possible implementation, the thickness of the main release layer 113 is 25-50 μm, the release force at room temperature is 5-15 g / 25 mm, and the release surface impedance is 10 4 ~10 9 Ω, non-release surface impedance is 10 4 ~10 7 Ω.

[0048] In the embodiment of the present application, the back protection substrate layer 121 can be made of a common optical substrate. In a possible implementation, the thickness of the back protection substrate layer 121 is 23 to 50 μm; both sides of the back protection substrate layer 121 have an antistatic layer, the thickness of the antistatic layer is 0.01 to 0.05 μm, and the surface impedance value is 10 4 ~10 9 Ω; the surface of the back protection substrate layer close to the back protection adhesive layer 122 is corona treated, and the surface tension is ≥38dyne / cm.

[0049] In a possible implementation, the thickness of the backing adhesive layer 122 is 8 to 15 μm, and the surface impedance is 10 9 ~10 11 Ω, peeling force is 4~10gf / 25mm;

[0050] The components of the low-viscosity adhesive liquid corresponding to the backing adhesive layer 122 include, by weight: 80-100 parts of acrylic resin, 0.5-3 parts of ionic liquid antistatic agent, 0.01-0.2 parts of accelerator, 0.5-1.5 parts of retarder, 60-100 parts of solvent, and 1-3 parts of curing agent.

[0051] The present application provides a method for preparing the support membrane of the above embodiment, which comprises the following steps:

[0052] A high viscosity adhesive liquid is coated on one side of the main substrate layer, and after heating and curing, a main release layer is laminated and subjected to a aging treatment to obtain a support film main body;

[0053] A low-viscosity adhesive is applied to one side of the backing substrate layer, and after being heated and cured, a release film is applied, and a curing treatment is performed. The release film is torn off and transferred to the other side of the main substrate layer of the supporting film body.

[0054] As an embodiment, the method for preparing the support membrane comprises the following steps:

[0055] S1. Preparation of the support film body: on the non-antistatic surface of the main substrate layer (exemplarily, the non-antistatic surface of the monoclonal antibody 75QTS2 with a thickness of 75 μm), a high-viscosity adhesive layer (exemplarily, the adhesive thickness is 13 μm) is coated by a comma blade or a slit coating process, and then heated in an oven for curing reaction (exemplarily, cured in a four-section oven, and the oven temperature is set to 80°C to 100°C to 130°C to 110°C). After the adhesive surface is cured, a release film with a double-sided antistatic coating (exemplarily, a double-sided antistatic release film with a gram weight of 5 to 13 g) is coated as the main release layer. After the semi-finished product structure is formed, it is subjected to a aging treatment at a temperature of 40 to 60°C for 2 to 4 days (exemplarily, after winding, it is placed in an aging room at 60°C for 4 days). The high-viscosity adhesive layer forms a corresponding main adhesive layer, and the support film body is manufactured through the above steps.

[0056] S2. Preparation of back guard: one side of the back guard substrate layer is provided with an antistatic layer, and the other side is coated with a layer of low-viscosity adhesive liquid by a comma scraper or a micro-concave roller (exemplarily, the low-viscosity adhesive liquid is coated on one side of the 38μm double-sided antistatic optical PET film with a surface tension ≥38dyne / cm, and the adhesive thickness is 12μm), and then heated in an oven for curing reaction (exemplarily, cured in a four-section oven, and the oven temperature is set to 70℃~90℃~120℃~100℃). After the adhesive surface is cured, a layer of low-weight release film is attached (exemplarily, a release film with a gram weight of 5-10g is attached), and a aging treatment is carried out at 40-60℃ and 3-5 days (to ensure the adhesion stability of the low-viscosity back guard, it is preferably aged for 3 days from April to September and 5 days from October to March; exemplarily, after winding, it is placed in a aging room at 60℃ for 4 days) to make a back guard.

[0057] S3. Transfer the back protection: Tear off the release film of the back protection and transfer it to the antistatic surface of the base material layer of the support film body that is not coated with glue to play a surface protection role and form a finished product structure.

[0058] The present application does not require the execution order of step S1 and step S2, which can be executed one after the other or simultaneously.

[0059] An embodiment of the present application provides an OLED module, which includes an upper cover glass, an OLED light-emitting layer, and a lower support film stacked in sequence from top to bottom. The lower support film adopts the support film of the aforementioned embodiment and the main body release layer is torn off, and the lower support film is adhered to the OLED light-emitting layer using the main body adhesive layer.

[0060] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0061] Example 1

[0062] S1. Use a micro-concave roller coating process to apply the low-viscosity adhesive liquid on the side of the 38μm double-sided antistatic optical PET film (backing substrate layer) with a surface tension ≥38dyne / cm. The adhesive thickness is 12μm. Curing is carried out in a four-section oven with the oven temperature set at 70℃~90℃~120℃~100℃. After leaving the oven, a release film with a gram weight of 10g is attached. After being rolled up, it is placed in a curing room at 60℃ for 5 days.

[0063] The low viscosity adhesive liquid composition of the back cover includes by weight:

[0064]

[0065]

[0066] Among them, the low-viscosity acrylic resin is Toyo Ink STS0204, the accelerator is Toyo Ink BXX3778-10, the retarder is Toyo Ink BXX5638, the curing agent is Toyo Ink BXX6269, the ionic liquid antistatic agent is Gutong GT-100F, and the solvent is ethyl acetate.

[0067] S2. Use a slit coater to coat the high-viscosity adhesive liquid of the support membrane body on the non-antistatic surface of the 75μm monoclonal antibody 75QTS2 (main substrate layer). The adhesive thickness is 13μm. Curing is carried out in a four-section oven with the oven temperature set at 80℃~100℃~130℃~110℃. After exiting the oven, a double-sided antistatic main release film with a gram weight of 10g is attached. After winding, the film is aged in a 60℃ aging room for 4 days.

[0068] The high viscosity liquid of the support membrane body comprises, by weight:

[0069]

[0070] Among them, the modified acrylic resin is TP246 from South Korea's TTT Company; the curing agent is aliphatic multifunctional epoxy resin, brand ERISYS GE-60 from Huntsman; the surface additive is BYK-314 from BYK Chemical; the additive is EPOMIN P-1050 from Japan Catalyst; and the solvent is a mixture of ethyl acetate: toluene with a ratio of 7:3.

[0071] S3. After the backing and the support film body are matured, they are cooled at room temperature for 3 days, the release film of the backing is torn off, and the backing is attached to the main substrate layer of the support film body to make a support film product.

[0072] Example 2

[0073] The structural composition and process route of the backing are the same as those of Example 1, and the difference from Example 1 is that the high viscosity liquid composition of the support film body includes, by weight:

[0074] Example 3

[0075] The difference from Example 1 is:

[0076] The high viscosity liquid of the support membrane body comprises, by weight:

[0077] Example 4

[0078] The difference from Example 1 is:

[0079] The high viscosity liquid composition of the support membrane body is calculated by weight:

[0080] Comparative Example 1

[0081] The difference from Example 1 is:

[0082] The composition of the adhesive solution of the support membrane is calculated by weight:

[0083]

[0084]

[0085] The surface additive of Comparative Example 1 is BYK-342 polyether-modified polydimethylsiloxane.

[0086] Comparative Example 2

[0087] The difference from Example 1 is:

[0088] The composition of the adhesive solution of the support membrane is calculated by weight:

[0089]

[0090] The additive of Comparative Example 2 is polyethyleneimine with a molecular weight of 10,000 produced by Japan Catalyst, brand SP-200.

[0091] Test items:

[0092] The following tests are performed without the backing adhesive layer and the backing substrate layer.

[0093] 1. Peeling force at room temperature: refer to GB / T 2792-2014 standard, the tensile testing machine is KJ-1065B tensile testing machine, and the steel plate is KJ6001A.

[0094] 2. Adhesion of adhesive layer: refer to ASTM D3359-23 standard, adopt cross-cut tape test, multi-blade cutting knife with spacing of 1mm-11 teeth, tape model 3M610.

[0095] 3. Holding force at room temperature: refer to GB / T 4851-2014; test temperature is room temperature, test plate is SUSA, and hanging weight is 1kg.

[0096] 4. High temperature retention: refer to GB / T 4851-2014; test temperature 90℃, test board SUSA, hanging weight 1kg.

[0097] 5. Double 85 holding force: refer to GB / T 4851-2014, the experimental environment is temperature 85℃, humidity 85%, test board SUSA, hanging weight is 1kg.

[0098] The following table shows the test results of the embodiments and comparative examples.

[0099]

[0100] Combined with the results in the above table, it can be seen that the lower supporting layer finally formed by the adhesive layer obtained by coating the high-viscosity adhesive liquid of the embodiment of the present application not only has excellent adhesive layer adhesion, but also has strong aging resistance, especially good high temperature retention.

[0101] In summary, the adhesive layer formed by the high-viscosity adhesive liquid in the embodiment of the present application has excellent adhesion and good aging resistance, and the support film can stably play a supporting and protective role, thereby improving the working stability of the OLED module.

[0102] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high viscosity adhesive solution, characterized in that: The composition comprises, by weight: 90 to 100 parts of modified acrylic resin, 50 to 90 parts of solvent, 0.05 to 1 part of surface additive, 0.01 to 0.2 parts of additive, and 0.05 to 5 parts of curing agent; The modified acrylic resin has a Tg of -60 to -30°C, a molecular weight of 200,000 to 800,000, and a storage modulus of 0.1 to 0.15 MPa; the surface additive includes polyester-modified polydimethylsiloxane; and the additive includes transparent polyethyleneimine with a molecular weight of 50,000 to 90,000.

2. The high viscosity adhesive according to claim 1, characterized in that: The solvent includes one or more mixtures of ethyl acetate, butyl acetate, acetone, butanone, and toluene; The curing agent includes one or more mixtures of diisocyanate, polyisocyanate, modified polyisocyanate, epoxy compound, and modified epoxy compound.

3. A support membrane, characterized in that: It comprises a body release layer, a body adhesive layer, a body substrate layer, a backing adhesive layer and a backing substrate layer which are stacked in sequence from bottom to top. The body adhesive layer is formed by coating and curing the high-viscosity adhesive liquid as claimed in claim 1 or 2.

4. The support membrane according to claim 3, characterized in that: The thickness of the main adhesive layer is 10 to 20 μm, and the surface impedance is 10 12 ~10 16 Ω, peel force>1000gf / 25mm.

5. The support membrane according to claim 3, characterized in that: The thickness of the main substrate layer is 23-150 μm, the transmittance is ≥90%, and the haze is ≤2%; the thermal shrinkage rate after baking at 150° C. for 30 minutes is <0.3% in the TD direction and <0.8% in the MD direction; The main substrate layer has an antistatic layer on one side, and the antistatic layer is close to the backing adhesive layer. The thickness of the antistatic layer is 0.02-0.1 μm, and the impedance value is 10 4 ~10 7 Ω; The main substrate layer is subjected to double-sided plasma or corona surface treatment, and the double-sided surface tension is ≥42 dyne / cm.

6. The support membrane according to claim 3, characterized in that: The thickness of the main release layer is 25-50 μm, the release force at room temperature is 5-15 g / 25 mm, and the release surface impedance is 10 4 ~10 9 Ω, non-release surface impedance is 10 4 ~10 7 Ω.

7. The support membrane according to claim 3, characterized in that: The thickness of the back protection substrate layer is 23 to 50 μm; Both sides of the back protection substrate layer have an antistatic layer, the thickness of the antistatic layer is 0.01 to 0.05 μm, and the surface impedance value is 10 4 ~10 9 Ω; The surface of the back-protecting substrate layer close to the back-protecting adhesive layer is subjected to corona treatment, and the surface tension is ≥38 dyne / cm.

8. The support membrane according to claim 3, characterized in that: The thickness of the backing adhesive layer is 8 to 15 μm, and the surface impedance is 10 9 ~10 11 Ω, peeling force is 4~10gf / 25mm; The components of the low-viscosity adhesive liquid corresponding to the backing adhesive layer include, by weight: 80-100 parts of acrylic resin, 0.5-3 parts of ionic liquid antistatic agent, 0.01-0.2 parts of accelerator, 0.5-1.5 parts of retarder, 60-100 parts of solvent, and 1-3 parts of curing agent.

9. A method for preparing a support membrane according to any one of claims 3 to 8, characterized in that: It includes the following steps: The high viscosity adhesive liquid is coated on one side of the main substrate layer, and after heating and curing, the main release layer is laminated and subjected to a aging treatment to obtain a support film main body; A low-viscosity adhesive is coated on one side of the backing substrate layer, and after being heated and cured, a release film is laminated, and a curing treatment is performed. The release film is torn off and transferred to the other side of the main substrate layer of the supporting film body.

10. An OLED module, characterized in that: It includes an upper cover glass, an OLED light-emitting layer, and a lower support film stacked in sequence from top to bottom. The lower support film is a support film as described in any one of claims 3 to 8, and the main body release layer is torn off, and the main body adhesive layer is used to adhere to the OLED light-emitting layer.

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