Base film of optical conductive film as well as preparation method and application of base film

Abstract

The invention provides an optical conductive film base film and a preparation method and application thereof, and the optical conductive film base film comprises a core layer, a first surface layer and a second surface layer; the first surface layer and the second surface layer are respectively arranged on two sides of the core layer to form a three-layer composite structure; the core layer comprises 90wt% of basic polyester resin and 10wt% of UV modified polyester resin, the first surface layer comprises 85wt% of basic polyester resin and 15wt% of anti-blocking agent resin, and the second surface layer is basic polyester resin. The prepared optical conducting film base film is suitable for producing conducting films needing to be plated with copper wires, the yield of downstream products can be increased, and the stability of product quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of optical thin films, and more specifically, to a preparation method and application of an optical conductive film base film. Background Art

[0002] At present, optical polyester films are widely used as base films for light diffusers, prisms, touch panels, etc. of LCD components. Biaxially oriented polyester films have good performance in formability, mechanical properties, thermal properties, electrical properties and chemical resistance, and can be used for different purposes, such as optical films, electrical insulation films, barrier films, release films, protective films, agricultural mulch films, packaging materials and thermal insulation films.

[0003] However, when polyester film is used as a conductive film base film, copper wire needs to be plated on the base film to form a conductive layer. There are often defects such as excessive protrusions on the film surface microstructure and precipitates carried by the polyester itself, which lead to copper wire breakage, resulting in low downstream yield and low stability of the output module. In the process of processing copper wire, ordinary corona base film has insufficient adhesion and the adhesion decreases over time. In the process of plating copper wire, an optical adhesive needs to be coated on the substrate, and in the subsequent drying process, the substrate itself needs to have anti-UV blocking properties. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] The technical problem to be solved by the present invention is that the existing conductive film base film has a problem that the microstructure protrusions on the surface of the film are too high, resulting in the breakage of the copper wire.

[0006] (II) Technical solution

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] In the first aspect, the present invention provides an optical conductive film base film, comprising a core layer, a first surface layer and a second surface layer; the first surface layer and the second surface layer are respectively arranged on both sides of the core layer to form a three-layer composite structure; wherein the core layer comprises 90wt% of a basic polyester resin and 10wt% of a UV modified polyester resin, the first surface layer comprises 85wt% of a basic polyester resin and 15wt% of an opening agent resin, and the second surface layer is a basic polyester resin.

[0009] Preferably, the opening agent resin is composed of PET resin and a polymer optical film opening agent, wherein the polymer optical film opening agent includes at least one of silicon oxide, calcium carbonate, and barium sulfate.

[0010] Preferably, the particle size of the polymer optical film opening agent is less than 2 μm.

[0011] In a second aspect, the present invention further provides a method for preparing an optical conductive film base film, which is used to prepare the optical conductive film base film described in any one of the above technical solutions, and the preparation method comprises the following steps:

[0012] The base polyester resin and the UV modified polyester resin are mixed in a weight ratio of 90:10 and fed into a main extruder to be melted to form a melt. The base polyester resin and the opening agent resin are mixed in a weight ratio of 85:15 and fed into an auxiliary extruder to be melted to form a melt. The base polyester resin is fed into another auxiliary extruder to be melted to form a melt. The melt is extruded through a co-extrusion die, cooled by a cooling roller to form a cast sheet, and the cast sheet is longitudinally stretched, coated by an online coater after longitudinal stretching, and then transversely stretched and heat-set in an oven to obtain the optical conductive film base film.

[0013] Preferably, the method further comprises the following steps:

[0014] The precipitates on the surface of the optical conductive film base film are removed by a dust suction device and a dust sticking roller;

[0015] The optical conductive film base film is rolled up and slit to form a film roll.

[0016] Preferably, the heating extrusion temperature of the melt is 270°C to 285°C, and the cooling temperature of the cooling roller is 30°C or less.

[0017] Preferably, the longitudinal stretching ratio is 3.3 to 4.2 times, and the transverse stretching ratio is 3.5 to 4 times.

[0018] Preferably, the oven comprises a first section, a second section, a third section and a fourth section connected in sequence, the first section is a drying zone with a heating temperature of 105°C to 120°C, the second section is a transverse stretching zone with a heating temperature of 120°C to 140°C, the third section is a shaping zone with a heating temperature of 230°C to 250°C, and the fourth section is a cooling zone with a heating temperature of 50°C to 130°C.

[0019] Preferably, the online coating machine applies an aqueous coating liquid, which includes the following components by mass fraction: 90% desalted water, 7% polymethyl methacrylate solution and 3% additives, wherein the additives include at least one of a wetting agent, a defoaming agent, a solvent and an opening agent.

[0020] In the third aspect, the present invention also provides an application of an optical conductive film base film described in any one of the above technical solutions or an optical conductive film base film obtained by the preparation method of the optical conductive film base film described in any one of the above technical solutions in the field of conductive film base films, wherein the second surface layer is used for plating metal wires to form a conductive layer.

[0021] (III) Beneficial effects

[0022] The above technical solution of the present invention has at least the following advantages:

[0023] 1. In the present invention, the core layer includes 90wt% of basic polyester resin and 10wt% of UV modified polyester resin, and the UV modified polyester resin can improve the UV blocking rate of the optical conductive film base film finally prepared, so that the optical conductive film base film can meet the requirements of a specific preparation process; the first surface layer includes 85wt% of basic polyester resin and 15wt% of opening agent resin, and the opening agent resin can improve the anti-sticking performance of the optical conductive film base film, and prevent the two adjacent layers of film from sticking together when the optical conductive film base film is rolled up; the second surface layer is the basic polyester resin, and the second surface layer serves as the processing surface of the optical conductive film base film, and metal wire can be plated thereon to achieve the conductive performance of the optical conductive film base film. Since it does not contain a polymer optical film opening agent, no excessive protrusions will be formed on its surface, and the plated metal wire will not be broken when the metal wire is plated, thereby improving the yield rate of downstream products and the stability of product quality.

[0024] 2. In the present invention, before the polyester film is rolled up, foreign matters on the film surface are cleaned by a specific cleaning method. The specific cleaning method includes using a dust suction device with air blowing, which first blows up foreign matters on the film surface and then sucks them away by the air suction device. A dust sticking roller is installed after the dust suction device to remove precipitates on the film surface. At the same time, a filter with a mesh size of 50-200 is installed at the return air outlet of the circulating fan in the shaping area and cooling area of ​​the horizontal drawing oven to reduce the oligomers falling on the film. This ensures that higher oligomers or precipitates will not adhere to the polyester film to meet the process requirements of the downstream metal plating wire. DETAILED DESCRIPTION

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly located on the other element or indirectly located on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0027] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" and the like to indicate directions or positional relationships are only for the convenience of describing the present invention, and do not indicate that a device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating relative importance or indicating the number of technical features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The specific implementation of the present invention is described in more detail below in conjunction with specific embodiments:

[0029] The embodiment of the present invention provides an optical conductive film base film, comprising a core layer, a first surface layer and a second surface layer; the first surface layer and the second surface layer are respectively arranged on both sides of the core layer to form a three-layer composite structure; wherein the core layer comprises 90wt% of a basic polyester resin and 10wt% of a UV modified polyester resin, the first surface layer comprises 85wt% of a basic polyester resin and 15wt% of an opening agent resin, and the second surface layer is a basic polyester resin. Preferably, the viscosity of the basic polyester resin is controlled between 0.64 and 0.69, which can reduce the load (such as environmental load, external force load, etc.) on the polyester resin during extrusion molding, and can reduce the heat generated by shearing processing to avoid thermal decomposition of the resin. Specifically, the main component of the UV modified polyester resin is polyethylene terephthalate, and additives such as ultraviolet absorbers (such as benzophenone and benzotriazole compounds), hindered amine light stabilizers, and nanomaterials (such as nano titanium dioxide or nano zinc oxide) are added. Through the combination of these components, the UV modified polyester resin can provide effective ultraviolet protection, extend the service life of the product, and maintain its appearance and performance; preferably, the UV blocking wavelength of the UV modified polyester resin must meet the requirements of the UV lamp during downstream processing, and the light transmittance of the UV modified polyester resin after being made into a film reaches more than 89%. The first surface layer and the second surface layer can be the same thickness or different thicknesses. The first surface layer is used as a non-processing surface, and the second surface layer is used as a processing surface.

[0030] In one embodiment, the opening agent resin is composed of PET resin and a polymer optical film opening agent, wherein the polymer optical film opening agent includes at least one of silicon oxide, calcium carbonate, and barium sulfate. The mass ratio of the polymer optical film opening agent to the total resin is 100 to 500 ppm. When the particle content of the polymer optical film opening agent is small, the anti-sticking effect is poor, the polyester film layer is easy to stick, and it is not easy for the polyester film to be rolled up. When the content of the polymer optical film opening agent is too high, the transmittance of the polyester optical film will be reduced. In particular, when the particle size of the polymer optical film opening agent is large, the surface of the film produced is larger. Preferably, the particle size of the polymer optical film opening agent is less than 2 μm, preferably 0.5 to 2 μm. If the particle size of the polymer optical film opening agent is higher than 2 μm, after the film is made, the particles are too high on the surface of the film, and the haze of the film is large, causing the copper wire to break during downstream processing, and the haze causes the finished product to be unsightly.

[0031] In one embodiment, the particle size of the polymer optical film opening agent is less than 2 μm.

[0032] The embodiment of the present invention further provides a method for preparing an optical conductive film base film, which is used to prepare any one of the optical conductive film base films in the above embodiments, and the preparation method comprises the following steps:

[0033] The base polyester resin and UV modified polyester resin are mixed in a weight ratio of 90:10 and fed into the main extruder to form a melt. The base polyester resin and the opening agent resin are mixed in a weight ratio of 85:15 and fed into an auxiliary extruder to form a melt. The base polyester resin is fed into another auxiliary extruder to form a melt. The melt is extruded through a co-extrusion die, cooled by a cooling roller to form a cast sheet, and the cast sheet is longitudinally stretched. After longitudinal stretching, it is coated by an online coater, and then transversely stretched and heat-set in an oven to obtain an optical conductive film base film. Specifically, longitudinal stretching can be performed by single-point or multi-point stretching, and infrared lamps are used for heating during stretching. After longitudinal stretching, a D-bar coating roller and a slit nozzle are used for spraying, and the water-based resin is pre-configured in advance. Then it enters the oven for transverse stretching. The oven includes the first section, the second section, the third section and the fourth section connected in sequence. The first section is a drying zone with a heating temperature of 105°C to 120°C, which dries the water-based coating applied by the online coater and preheats the film; the second section is a transverse stretching zone with a heating temperature of 120°C to 140°C, and the transverse stretching ratio (TD) is preferably 3.5 to 4 times; the third section is a shaping zone with a heating temperature of 230°C to 250°C, which performs thermal curing on the film to stabilize the molecular structure and stabilize the various properties of the film; the fourth section is a cooling zone with a heating temperature of 50°C to 130°C. The stretching temperature and stretching ratio significantly affect the molecular orientation, and therefore affect the glass transition temperature and the hard amorphous structure content. The longitudinal stretching ratio refers to the ratio of the length after stretching to the length before stretching, that is, the length after stretching / the length before stretching. However, when calculated in an actual continuous process, in the case of roll-to-roll longitudinal stretching (stretching in the longitudinal direction), the ratio of the roller speed after stretching to the roller speed before stretching can be used as the stretch ratio. In the case of transverse stretching (stretching in the transverse direction) using an oven, the ratio of the width of the tenter outlet (the widest part of the tenter) to the width of the inlet can be defined as the stretch ratio.

[0034] In one embodiment, the following steps are also included:

[0035] The precipitates on the surface of the optical conductive film base film are removed by a dust suction device and a dust sticking roller;

[0036] The optical conductive film base film is rolled up and slit to form a film roll. Specifically, during the high-temperature treatment process such as stretching and shaping of the polyester film, oligomers will be formed and attached to the surface of the film, thereby causing defects in the film itself and causing wire breakage during downstream copper wire processing. In order to ensure the quality of the optical polyester film itself, in a preferred embodiment of the present application, before the polyester film is rolled up, foreign matter on the film surface is cleaned by a specific cleaning method. The cleaning method includes using a dust suction device with air blowing. The dust suction device first blows up foreign matter on the film surface and then sucks the foreign matter away by an air suction device. A dust-sticking roller is installed after the dust suction device to remove precipitates on the surface of the film. At the same time, a filter with a mesh size of 50-200 is installed at the return air outlet of the circulating fan in the shaping area and cooling area of ​​the horizontal pulling oven to reduce the oligomers falling on the film.

[0037] In one embodiment, the heating extrusion temperature of the melt is 270°C to 285°C, and the cooling temperature of the cooling roller is below 30°C.

[0038] In one embodiment, the longitudinal stretching ratio is 3.3 to 4.2 times, and the transverse stretching ratio is 3.5 to 4 times.

[0039] In one embodiment, the oven includes a first section, a second section and a third section connected in sequence, the first section is a drying zone with a heating temperature of 105°C to 120°C, the second section is a transverse stretching zone with a heating temperature of 120°C to 140°C, and the third section is a shaping zone with a heating temperature of 230°C to 250°C.

[0040] In one embodiment, the online coating machine applies an aqueous coating liquid, which includes the following components by mass fraction: 90% desalted water, 7% polymethyl methacrylate solution and 3% additives, wherein the additives include at least one of a wetting agent, a defoaming agent, a solvent and an opening agent.

[0041] An embodiment of the present invention also provides an application of an optical conductive film base film of any one of the above embodiments or an optical conductive film base film obtained by the preparation method of any one of the above embodiments in the field of conductive film base films, wherein the second surface layer is used for plating metal wires to form a conductive layer.

[0042] To demonstrate the effects of the optical conductive film base film provided by the present invention, the following are specific examples and comparative examples provided by the present invention:

[0043] Example 1

[0044] The base polyester resin and UV modified polyester resin are mixed in a ratio of 90:10 and enter the main extruder (twin-screw extruder). The base polyester resin and the opening agent resin containing silicon oxide are mixed in a ratio of 85:15 and enter two auxiliary extruders (twin-screw extruders). After melting at 280°C, the melt flows out of the co-extrusion die head and is cooled to below 30°C by a cold roller. Then, longitudinal stretching is first performed, with a longitudinal stretching ratio (MD) of 3.4 times and a stretching temperature of 82°C; online coating, the aqueous coating liquid is deionized water, main liquid, and auxiliary agent in a ratio of 90:7:3; then transverse stretching is performed, with a stretching temperature of 124°C and a transverse stretching ratio (TD) of 3.6 times; then heat setting at 240°C, and relaxation of 3% to 5% of the transverse track for stress release to obtain the result. Rolling and slitting to obtain an optical conductive film base film with a thickness of 50um. Specifically, the base polyester resin is polyethylene terephthalate (PET) with a viscosity of 0.68. In the silicon oxide-containing opening agent resin, the mass ratio of the polymer optical film opening agent to the total resin is 300 ppm, and the particle size of the polymer optical film opening agent is 1.5 μm.

[0045] Example 2

[0046] The base polyester resin and UV modified polyester resin are mixed in a ratio of 90:10 and enter the main extruder (twin-screw extruder). The base polyester resin and the opening agent resin containing silicon oxide are mixed in a ratio of 85:15 and enter an auxiliary extruder (twin-screw extruder). The base polyester resin enters another auxiliary extruder (twin-screw extruder). After melting at 280°C, the melt flows out of the co-extrusion die head and is cooled to below 30°C by a cold roller. Then, longitudinal stretching is first performed, with a longitudinal stretching ratio (MD) of 3.4 times and a stretching temperature of 82°C; online coating, the aqueous coating liquid is deionized water, main liquid, and auxiliary agent in a ratio of 90:7:3; then transverse stretching is performed, with a stretching temperature of 124°C and a transverse stretching ratio (TD) of 3.6 times; then heat setting at 240°C, and relaxation of 3% to 5% of the transverse track for stress release to obtain the optical conductive film base film. Rolling and slitting are performed to obtain the optical conductive film base film, the thickness of which is 50um. Specifically, the base polyester resin is polyethylene terephthalate (PET) with a viscosity of 0.68. In the silicon oxide-containing opening agent resin, the mass ratio of the polymer optical film opening agent to the total resin is 300 ppm, and the particle size of the polymer optical film opening agent is 1.5 μm.

[0047] Example 3

[0048] Based on Example 1, this example further adds the following solution on the basis of Example 1: a dust suction device is installed on the cooling roller before winding, and a dust sticking roller is installed after the dust suction device to remove precipitates on the surface of the film.

[0049] Example 4

[0050] Based on Example 1, this embodiment further adds the following solution on the basis of Example 1: a 100-mesh filter is installed at the return air outlet of the oven. In the oven, when the polyester film is heated and horizontally stretched, some particles will evaporate into the air. The filter is installed at the return air outlet of the oven. The filter can filter out the PET particles in the air to prevent them from adhering to the polyester film after horizontal stretching.

[0051] Example 5

[0052] The base polyester resin and UV modified polyester resin are mixed in a ratio of 90:10 and enter the main extruder (twin-screw extruder). The base polyester resin and the opening agent resin containing silicon oxide are mixed in a ratio of 85:15 and enter an auxiliary extruder (twin-screw extruder). The base polyester resin enters another auxiliary extruder (twin-screw extruder). After melting at 280°C, the melt flows out of the co-extrusion die head and is cooled to below 30°C by a cold roller. Then, longitudinal stretching is first performed, with a longitudinal stretching ratio (MD) of 3.4 times and a stretching temperature of 82°C; online coating, the aqueous coating liquid is deionized water, main liquid, and auxiliary agent in a ratio of 90:7:3; then transverse stretching is performed, with a stretching temperature of 124°C and a transverse stretching ratio (TD) of 3.6 times; then heat setting at 240°C, and relaxation of 3% to 5% of the transverse track for stress release to obtain the optical conductive film base film. Rolling and slitting are performed to obtain the optical conductive film base film, the thickness of which is 50um. Specifically, the base polyester resin is polyethylene terephthalate (PET), and its viscosity is 0.68. In the silicon oxide-containing opening agent resin, the mass ratio of the polymer optical film opening agent to the total resin is 300ppm, and the particle size of the polymer optical film opening agent is 1.5μm. A dust suction device is installed on the cooling roller before winding, and a dust sticking roller is installed behind the dust suction device to remove the precipitate on the surface of the film. A 100-mesh filter is installed at the return air outlet in the horizontal pulling oven.

[0053] Comparative Example 1

[0054] Based on Example 5, the difference between this comparative example and Example 5 is that the base polyester resin and the UV modified polyester resin are mixed in a ratio of 90:10 and enter the main extruder (twin-screw extruder), and the base polyester resin and the silicon oxide-containing opening agent resin are mixed in a ratio of 85:25 and enter two auxiliary extruders (twin-screw extruders) respectively.

[0055] Comparative Example 2

[0056] Based on Example 5, the difference between this comparative example and Example 5 is that the base polyester resin and the UV modified polyester resin are mixed in a ratio of 90:10 and enter the main extruder (twin-screw extruder), the base polyester resin and the silicon oxide-containing opening agent resin are mixed in a ratio of 85:25 and enter an auxiliary extruder (twin-screw extruder), and the base polyester resin directly enters another auxiliary extruder (twin-screw extruder).

[0057] Comparative Example 3

[0058] Based on Example 5, the difference between this comparative example and Example 5 is that the base polyester resin and the UV modified polyester resin are mixed in a ratio of 90:10 and enter the main extruder (twin-screw extruder), and the base polyester resin and the silicon oxide-containing opening agent resin are mixed in a ratio of 85:5 and enter two auxiliary extruders (twin-screw extruders) respectively.

[0059] Comparative Example 4

[0060] Based on Example 5, the difference between this comparative example and Example 5 is that the base polyester resin and the UV modified polyester resin are mixed in a ratio of 90:10 and enter the main extruder (twin-screw extruder), the base polyester resin and the silicon oxide-containing opening agent resin are mixed in a ratio of 85:5 and enter an auxiliary extruder (twin-screw extruder), and the base polyester resin directly enters another auxiliary extruder (twin-screw extruder).

[0061] Examples 1-5 and Comparative Examples 1-4 were evaluated by the following test methods.

[0062] (1) Light transmittance: Test standard ASTM D1003.

[0063] (2) Haze: Test standard ASTM D1003.

[0064] (3) UV blocking rate: test standard ASTM D1003.

[0065] (4) Thermal shrinkage: Test standard ASTM D1204 (150°C, 30 min).

[0066] (5) Number of defective spots: The inspection method is to set the CCD parameters on the BOPET production line and set the defect detection size to 0.1 mm and above. The CCD system automatically counts the number of defective spots exceeding 0.1 mm per roll and converts it into the number of defective spots per square meter.

[0067] (6) Winding effect: mainly evaluates the winding condition of the film. ◎ means that the winding end surface is neat, without bumps and concave points, and the film surface is flat; 0 means there are slight bumps and concave points; △ means there are serious bumps and concave points or the film surface is uneven, which has affected normal use.

[0068] (7) Processing surface protrusion: The processing surface is the surface of the second surface layer. The PET finished film roll with good winding effect is sent to the client to verify the processing surface protrusion. The surface particle protrusion is measured with a conjugate focus microscope. The number of particles with protrusions exceeding 2um per unit area is counted and recorded.

[0069] The test results are shown in the following table:

[0070]

[0071] According to the above test results, we can know that:

[0072] In Examples 1-4 and Comparative Examples 1-4, when the ratio of the opening agent is extremely low and the equipment is not optimized, a good winding effect is not achieved. When the ratio of the opening agent is high, either the surface particles protrude too much or the haze exceeds the customer's standard range (the customer requires a haze of ≤1.2), and the best use effect cannot be achieved.

[0073] Therefore, in this invention, Example 5 adds an appropriate proportion of opening agent resin to the non-processed surface, coats the processed surface with water-based resin, adds UV special polyester material to the main extrusion, coats the water-based resin online after longitudinal stretching, adds a dense filter screen to the horizontal pulling oven, and adds a dust removal device before winding, so as to achieve a special polyester film that meets the expectations, which can be used for downstream customers to process the copper-plated wire into the required conductive film for use in touch screens.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical conductive film base film, characterized in that: It includes a core layer, a first surface layer and a second surface layer; the first surface layer and the second surface layer are respectively arranged on both sides of the core layer to form a three-layer composite structure; wherein the core layer includes 90wt% of a basic polyester resin and 10wt% of a UV modified polyester resin, the first surface layer includes 85wt% of a basic polyester resin and 15wt% of an opening agent resin, and the second surface layer is a basic polyester resin.

2. The optical conductive film base film according to claim 1, characterized in that: The opening agent resin is composed of PET resin and a polymer optical film opening agent, wherein the polymer optical film opening agent includes at least one of silicon oxide, calcium carbonate, and barium sulfate.

3. The optical conductive film base film according to claim 2, characterized in that: The particle size of the polymer optical film opening agent is less than 2 μm.

4. A method for preparing an optical conductive film base film, characterized in that: For preparing the optical conductive film base film according to any one of claims 1 to 3, the preparation method comprises the following steps: The base polyester resin and the UV modified polyester resin are mixed in a weight ratio of 90:10 and fed into a main extruder to be melted to form a melt. The base polyester resin and the opening agent resin are mixed in a weight ratio of 85:15 and fed into an auxiliary extruder to be melted to form a melt. The base polyester resin is fed into another auxiliary extruder to be melted to form a melt. The melt is extruded through a co-extrusion die, cooled by a cooling roller to form a cast sheet, and the cast sheet is longitudinally stretched, coated by an online coater after longitudinal stretching, and then transversely stretched and heat-set in an oven to obtain the optical conductive film base film.

5. The method for preparing an optical conductive film base film according to claim 4, characterized in that: The following steps are also included: The precipitates on the surface of the optical conductive film base film are removed by a dust suction device and a dust sticking roller; The optical conductive film base film is rolled up and slit to form a film roll.

6. The method for preparing an optical conductive film base film according to claim 4, characterized in that: The heating extrusion temperature of the melt is 270° C. to 285° C., and the cooling temperature of the cooling roll is 30° C. or less.

7. The method for preparing an optical conductive film base film according to claim 4, characterized in that: The longitudinal stretching ratio is 3.3 to 4.2 times, and the transverse stretching ratio is 3.5 to 4 times.

8. The method for preparing an optical conductive film base film according to claim 4, characterized in that: The oven includes a first section, a second section, a third section and a fourth section which are connected in sequence, wherein the first section is a drying zone with a heating temperature of 105°C to 120°C, the second section is a transverse stretching zone with a heating temperature of 120°C to 140°C, the third section is a shaping zone with a heating temperature of 230°C to 250°C, and the fourth section is a cooling zone with a heating temperature of 50°C to 130°C.

9. The method for preparing an optical conductive film base film according to claim 4, wherein: The online coating machine applies a water-based coating liquid, which includes the following components by mass fraction: 90% desalted water, 7% polymethyl methacrylate solution and 3% auxiliary agent, wherein the auxiliary agent includes at least one of a wetting agent, a defoaming agent, a solvent and an opening agent.

10. Application of the optical conductive film base film according to any one of claims 1 to 3 or the optical conductive film base film obtained by the preparation method of the optical conductive film base film according to any one of claims 4 to 9 in the field of conductive film base films, wherein the second surface layer is used for plating metal wires to form a conductive layer.

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