Coating composition, protective film and metal grid

Abstract

The application relates to a coating composition, a protective film and a metal mesh. The coating composition of the application comprises the following components in mass fractions: 10-30 parts of resin, 0.1-0.5 parts of fluorine surfactant, 0.1-1 part of modified silicone surfactant, 1-3 parts of conductive agent, and 65.5-88.8 parts of organic solvent. Within the mass fraction ranges of the components of the coating composition, the coating composition has good improvement effects on the performance and appearance of metal mesh lines when used for preparing a protective layer on the surface of the metal mesh.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of touch sensing, in particular to a coating composition, a protective film and a metal mesh. BACKGROUND

[0002] In the metal mesh, signal isolation between touch channel areas is generally realized through the design of the trace opening in the virtual trace area. When the size of the opening is too small, the metal mesh lines on both sides of the opening are prone to be broken down. When the size of the opening is too large, it will cause a relatively obvious visual impact on the appearance of the metal mesh, such as the channel trace problem of presenting a bright and dark striped phenomenon. In this regard, a minimum opening distance is usually set on the trace opening size of the virtual trace area of the metal mesh line to ensure that the metal mesh opening is not broken down and to reduce the visual impact of the opening on the metal mesh as much as possible.

[0003] Therefore, the minimum opening distance is particularly important for the performance and appearance of the metal mesh touch sensor, and the visual impact of the traditional minimum opening distance size on the metal mesh is still large under the condition that the metal mesh opening is not broken down. SUMMARY

[0004] Therefore, it is necessary to provide a coating composition, a protective film and a metal mesh. The coating composition of the present application has a good improvement effect on the performance and appearance of the metal mesh line when used to prepare a protective layer on the surface of the metal mesh.

[0005] In a first aspect, the present application provides a coating composition, comprising the following components in mass fractions:

[0006] 10-30 parts of a resin, 0.1-0.5 parts of a fluorine surfactant, 0.1-1 parts of a modified silicone surfactant, 1-3 parts of a conductive agent, and 65.5-88.8 parts of an organic solvent.

[0007] In some embodiments, the modified silicone surfactant includes at least one of a polyester modified silicone surfactant and a polyether modified silicone oil.

[0008] In some embodiments, the modified silicone surfactant includes the polyester modified silicone surfactant and the polyether modified silicone oil, the mass fraction of the polyester modified silicone surfactant is 0.1-0.5 parts, and the mass fraction of the polyether modified silicone oil is 0.1-0.5 parts.

[0009] In some embodiments, the conductive agent includes at least one of polypyrrole and polythiophene.

[0010] In some embodiments, the resin comprises at least one of methyl methacrylate, ethyl acrylate copolymer, polyurethane modified acrylic resin, acrylic polyol resin, and acrylic amino resin.

[0011] In some embodiments, the organic solvent comprises at least one of ethyl lactate, ethyl acetate, propyl acetate, butyl acetate, propylene glycol monomethyl ether, and propylene glycol methyl ether acetate.

[0012] In some embodiments, the coating composition further comprises an inhibitor in a mass fraction of 0.5 parts to 2 parts.

[0013] In some embodiments, the inhibitor comprises at least one of triazole, thiazole, and quinoline.

[0014] In a second aspect, the present application provides a protective film prepared by the coating composition of any one of the above.

[0015] In a third aspect, the present application provides a metal mesh comprising: a metal mesh line and the protective film of the above, wherein the protective film is located on the surface of the metal mesh line.

[0016] The coating composition described above takes resin as a base material, and the addition of an appropriate amount of conductive agent can reduce the surface resistance of the protective layer, improve the anti-breakdown capability of the metal mesh line at the opening, and thus reduce the size of the wiring opening to reduce the influence of the opening size on the appearance of the metal mesh. Meanwhile, through the joint action of an appropriate amount of fluorine surfactant and modified silicone surfactant, the solubility of the conductive agent is enhanced to improve the overall performance of the coating, and the problem of misting during the preparation of the protective layer by the coating composition can be reduced. Within the mass fraction range of each component of the coating composition, the coating composition used for preparing the protective layer on the surface of the metal mesh has good improvement effects on the performance and appearance of the metal mesh line. DETAILED DESCRIPTION

[0017] To make the above objectives, features and advantages of the present application more apparent and understandable, the specific embodiments of the present application are described in detail below. In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0019] In addition, the terms "first", "second", etc. are used herein only to describe various conditions, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0020] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] An embodiment of the present application provides a coating composition, which comprises the following components in mass fraction: 10-30 parts of resin, 0.1-0.5 parts of fluorine surfactant, 0.1-1 parts of modified silicone surfactant, 1-3 parts of conductive agent, and 65.5-88.8 parts of organic solvent.

[0022] The coating composition described above takes resin as a base material, and the addition of an appropriate amount of conductive agent can reduce the surface resistance of the protective layer, improve the anti-breakdown capability of the metal grid line opening, and thus reduce the size of the wiring opening, so as to reduce the influence of the opening size on the appearance of the metal grid. Meanwhile, through the joint action of the appropriate amount of fluorine surfactant and modified silicone surfactant, the solubility of the conductive agent is enhanced to improve the performance of the overall coating, and the problem of misting during the preparation of the protective layer by the coating composition can be reduced. When the coating composition is used to prepare the protective layer on the surface of the metal grid, the performance and appearance of the metal grid line are both improved.

[0023] Optionally, the mass fraction of the resin is 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, or 30 parts. Alternatively, the mass fraction of the resin can also be within a range between any two of the above mass fractions.

[0024] Optionally, the mass fraction of the fluorosurfactant is 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, or 0.5 parts. Alternatively, the mass fraction of the fluorosurfactant can also be within a range between any two of the above mass fractions.

[0025] Optionally, the mass fraction of the modified silicone surfactant is 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, or 1 parts. Alternatively, the mass fraction of the modified silicone surfactant can also be within a range between any two of the above mass fractions.

[0026] Optionally, the mass fraction of the conductive agent is 1 parts, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, or 3 parts. Alternatively, the mass fraction of the conductive agent can also be within a range between any two of the above mass fractions.

[0027] Optionally, the mass fraction of the organic solvent is 65.5 parts, 66 parts, 67 parts, 68 parts, 69 parts, 70 parts, 71 parts, 72 parts, 73 parts, 74 parts, 75 parts, 76 parts, 77 parts, 78 parts, 79 parts, 80 parts, 81 parts, 82 parts, 83 parts, 84 parts, 85 parts, 86 parts, 87 parts, 88 parts, or 88.8 parts. Alternatively, the mass fraction of the organic solvent can also be within a range between any two of the above mass fractions.

[0028] In some embodiments, the fluorosurfactant includes a partially fluorinated alcohol substituted ethylene glycol. The fluorosurfactant can provide very low surface tension in the coating composition, making the coating composition have better wetting, spreading, and leveling properties.

[0029] In some embodiments, the modified silicone surfactant includes at least one of a polyester modified silicone surfactant and a polyether modified silicone oil. The modified silicone surfactant can reduce the surface tension of the coating composition, making the coating composition have excellent substrate wetting effect, being able to prevent shrinkage of the protective film and increase its surface slipperiness. The polyether modified silicone oil can play a role of lubrication and leveling in the coating composition.

[0030] In some embodiments, the modified silicone surfactant includes a polyester modified silicone surfactant and a polyether modified silicone oil.

[0031] In some embodiments, the modified silicone surfactant includes a polyester modified silicone surfactant and a polyether modified silicone oil, the mass fraction of the polyester modified silicone surfactant is 0.1 parts to 0.5 parts, and the mass fraction of the polyether modified silicone oil is 0.1 parts to 0.5 parts.

[0032] Optionally, the mass fraction of the polyester modified silicone surfactant is 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, or 0.5 parts. Alternatively, the mass fraction of the polyester modified silicone surfactant can also be within a range between any two of the above mass fractions.

[0033] Optionally, the mass fraction of the polyether modified silicone oil is 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, or 0.5 parts. Alternatively, the mass fraction of the polyether modified silicone oil can also be within a range between any two of the above mass fractions.

[0034] In some embodiments, the conductive agent includes at least one of a conductive polymer.

[0035] In some embodiments, the conductive agent includes at least one of a polypyrrole and a polythiophene. The addition of the conductive agent can effectively reduce the surface resistance of the protective film, so as to improve the anti-breakdown capability at the openings of the metal mesh lines, thereby realizing a smaller opening size.

[0036] In some embodiments, the resin includes at least one of methyl methacrylate, ethyl acrylate copolymer, polyurethane modified acrylic resin, polyol acrylic resin, and amino acrylic resin. The above resin materials have good adhesion, toughness, durability, and boiling water resistance.

[0037] In some embodiments, the organic solvent includes at least one of ethyl lactate, ethyl acetate, propyl acetate, butyl acetate, propylene glycol monomethyl ether, and propylene glycol methyl ether acetate.

[0038] In some embodiments, the coating composition further includes an inhibitor with a mass fraction of 0.5 parts to 2 parts.

[0039] Optionally, the mass fraction of the corrosion inhibitor is 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, or 2 parts. Alternatively, the mass fraction of the corrosion inhibitor can also be within a range between any two of the above mass fractions.

[0040] In some embodiments, the corrosion inhibitor comprises at least one of triazole, thiazole, and quinoline.

[0041] In some embodiments, the corrosion inhibitor comprises at least one of 2-mercaptobenzothiazole, 8-hydroxyquinoline, and benzothiazole.

[0042] In some embodiments, the coating composition comprises the following mass fractions of the components: 10 parts to 30 parts of the resin, 0.1 parts to 0.5 parts of the fluorine surfactant, 0.1 parts to 1 part of the modified silicone surfactant, 1 part to 3 parts of the conductive agent, 0.5 parts to 2 parts of the corrosion inhibitor, and 65.5 parts to 88.8 parts of the organic solvent.

[0043] In some embodiments, the coating composition comprises the following mass percentages of the components: 10% to 30% of the resin, 0.1% to 0.5% of the fluorine surfactant, 0.1% to 1% of the modified silicone surfactant, 1% to 3% of the conductive agent, and 65.5% to 88.8% of the organic solvent.

[0044] In some embodiments, the raw materials of the coating composition comprise the following mass percentages of the components: 10% to 30% of the resin, 0.1% to 0.5% of the fluorine surfactant, 0.1% to 1% of the modified silicone surfactant, 1% to 3% of the conductive agent, and 65.5% to 88.8% of the organic solvent.

[0045] Yet another embodiment of the present application provides a method for preparing a coating composition, comprising: mixing the following mass fractions of the components: 10 parts to 30 parts of the resin, 0.1 parts to 0.5 parts of the fluorine surfactant, 0.1 parts to 1 part of the modified silicone surfactant, 1 part to 3 parts of the conductive agent, and 65.5 parts to 88.8 parts of the organic solvent.

[0046] Yet another embodiment of the present application provides a protective film prepared by any of the above coating compositions. It can be understood that when the coating composition is used to prepare the protective film, the organic solvent will volatilize, and the other components in the coating composition together constitute the protective film.

[0047] In some embodiments, the protective film comprises the following mass fractions of the components: 10 parts to 30 parts of the resin, 0.1 parts to 0.5 parts of the fluorine surfactant, 0.1 parts to 1 part of the modified silicone surfactant, 1 part to 3 parts of the conductive agent.

[0048] A further embodiment of the present application provides a method for preparing a protective film, comprising: applying the coating composition of any of the above on a substrate; and curing the coating composition to obtain the protective film.

[0049] A further embodiment of the present application provides a metal mesh, comprising: a metal mesh line and the protective film of the above, wherein the protective film is located on the surface of the metal mesh line.

[0050] The following are specific embodiments

[0051] Embodiment 1

[0052] The components of the coating composition include 12% resin, 0.1% fluorine surfactant, 0.1% modified silicone surfactant, 3% conductive agent, and 84.8% organic solvent. The resin in this embodiment is an acrylic resin, and the product model is Paraloid B-48N. The fluorine surfactant in this embodiment is a product with the model DuPont FS31. The modified silicone surfactant in this embodiment is a polyester-modified silicone surfactant, and the product model is BYK 310. The conductive agent in this embodiment is polythiophene, and the product model is CHTA 402. The organic solvent in this embodiment is ethyl acetate.

[0053] The protective film: the protective film in this embodiment is prepared using the coating composition described above, and the components of the prepared protective film include the following components in the following mass fractions: 12 parts of Paraloid B-48N acrylic resin, 0.1 part of DuPont FS31 fluorine surfactant, 0.1 part of BYK 310 polyester-modified silicone surfactant, and 3 parts of CHTA 402 polythiophene conductive agent.

[0054] Embodiment 2

[0055] The components of the coating composition include 12% resin, 0.1% fluorine surfactant, 0.3% modified silicone surfactant, 3% conductive agent, and 84.6% organic solvent. The resin in this embodiment is an acrylic resin, and the product model is Paraloid B-48N. The fluorine surfactant in this embodiment is a product with the model DuPont FS31. The modified silicone surfactant in this embodiment is a polyester-modified silicone surfactant, and the product model is BYK 310. The conductive agent in this embodiment is polythiophene, and the product model is CHTA 402. The organic solvent in this embodiment is ethyl acetate.

[0056] Protective film: The protective film in this example was prepared using the coating composition described above, and the components of the prepared protective film were as follows: 12 parts of Paraloid B-48N acrylic resin, 0.1 part of DuPont FS31 fluorine surfactant, 0.3 part of BYK 310 polyester-modified silicone surfactant, and 3 parts of CHTA 402 polythiophene conductive agent.

[0057] Example 3

[0058] Coating composition components: 20% resin, 0.1% fluorine surfactant, 0.1% modified silicone surfactant, 3% conductive agent, and 76.8% organic solvent. The resin in this example was an acrylic resin, and the product brand was Paraloid B-48N. The fluorine surfactant product brand in this example was DuPont FS31. The modified silicone surfactant in this example was a polyester-modified silicone surfactant, and the product brand was BYK 310. The conductive agent in this example was polythiophene, and the product brand was CHTA 402. The organic solvent in this example was ethyl acetate.

[0059] Protective film: The protective film in this example was prepared using the coating composition described above, and the components of the prepared protective film were as follows: 20 parts of Paraloid B-48N acrylic resin, 0.1 part of DuPont FS31 fluorine surfactant, 0.1 part of BYK 310 polyester-modified silicone surfactant, and 3 parts of CHTA 402 polythiophene conductive agent.

[0060] Example 4

[0061] Coating composition components: 12% resin, 0.1% fluorine surfactant, 0.1% modified silicone surfactant, 2% conductive agent, and 85.8% organic solvent. The resin in this example was an acrylic resin, and the product brand was Paraloid B-48N. The fluorine surfactant product brand in this example was DuPont FS31. The modified silicone surfactant in this example was a polyester-modified silicone surfactant, and the product brand was BYK 310. The conductive agent in this example was polythiophene, and the product brand was CHTA 402. The organic solvent in this example was ethyl acetate.

[0062] Protective film: The protective film in this example was prepared using the coating composition described above, and the components of the prepared protective film were as follows: 12 parts of Paraloid B-48N acrylic resin, 0.1 part of DuPont FS31 fluorine surfactant, 0.1 part of BYK 310 polyester-modified silicone surfactant, and 2 parts of CHTA 402 polythiophene conductive agent.

[0063] Example 5

[0064] Coating composition components: 12% resin, 0.1% fluorine surfactant, 0.1% modified silicone surfactant, 1% conductive agent, and 86.8% organic solvent. The resin in this example was an acrylic resin, and the product brand was Paraloid B-48N. The fluorine surfactant product brand in this example was DuPont FS31. The modified silicone surfactant in this example was a polyester-modified silicone surfactant, and the product brand was BYK 310. The conductive agent in this example was polythiophene, and the product brand was CHTA 402. The organic solvent in this example was ethyl acetate.

[0065] Protective film: The protective film in this example was prepared using the coating composition described above, and the components of the prepared protective film were as follows: 12 parts of Paraloid B-48N acrylic resin, 0.1 part of DuPont FS31 fluorine surfactant, 0.1 part of BYK 310 polyester-modified silicone surfactant, and 1 part of CHTA 402 polythiophene conductive agent.

[0066] Example 6

[0067] Coating composition components: 12% resin, 0.3% fluorine surfactant, 0.1% modified silicone surfactant, 3% conductive agent, and 84.6% organic solvent. The resin in this example was an acrylic resin, and the product brand was Paraloid B-48N. The fluorine surfactant product brand in this example was DuPont FS31. The modified silicone surfactant in this example was a polyester-modified silicone surfactant, and the product brand was BYK 310. The conductive agent in this example was polythiophene, and the product brand was CHTA 402. The organic solvent in this example was ethyl acetate.

[0068] Protective film: The protective film in this example was prepared using the coating composition described above, and the components of the prepared protective film were as follows: 12 parts of Paraloid B-48N acrylic resin, 0.3 parts of DuPont FS31 fluorine surfactant, 0.1 parts of BYK 310 polyester-modified silicone surfactant, and 3 parts of CHTA 402 polythiophene conductive agent.

[0069] Example 7

[0070] Coating composition components: 12% resin, 0.1% fluorine surfactant, 0.1% polyester-modified silicone surfactant, 0.15% polyether-modified silicone oil, 3% conductive agent, and 84.65% organic solvent. The resin in this example was an acrylic resin, and the product brand was Paraloid B-48N. The fluorine surfactant product brand in this example was DuPont FS31. The polyester-modified silicone surfactant product brand in this example was BYK 310. The polyether-modified silicone oil product brand in this example was SI-204A. The conductive agent was polythiophene, and the product brand was CHTA 402. The organic solvent in this example was ethyl acetate.

[0071] Protective film: The protective film in this example was prepared using the coating composition described above, and the components of the prepared protective film were as follows: 12 parts of Paraloid B-48N acrylic resin, 0.1 parts of DuPont FS31 fluorine surfactant, 0.1 parts of BYK 310 polyester-modified silicone surfactant, 0.15 parts of SI-204A polyether-modified silicone oil, and 3 parts of CHTA 402 polythiophene conductive agent.

[0072] Example 8

[0073] Coating composition components: 12% resin, 0.1% fluorine surfactant, 0.2% polyester-modified silicone surfactant, 0.35% polyether-modified silicone oil, 3% conductive agent, and 84.35% organic solvent. The resin in this example was an acrylic resin, and the product brand was Paraloid B-48N. The fluorine surfactant product brand in this example was DuPont FS31. The polyester-modified silicone surfactant product brand in this example was BYK 310. The polyether-modified silicone oil product brand in this example was SI-204A. The conductive agent was polythiophene, and the product brand was CHTA 402. The organic solvent in this example was ethyl acetate.

[0074] Protective film: The protective film in this example was prepared using the coating composition described above, and the components of the prepared protective film were as follows: 12 parts of Paraloid B-48N acrylic resin, 0.1 part of DuPont FS31 fluorine surfactant, 0.2 part of BYK 310 polyester-modified silicone surfactant, 0.35 part of SI-204A polyether-modified silicone oil, and 3 parts of CHTA 402 polythiophene conductive agent.

[0075] Example 9

[0076] Coating composition components: 12% resin, 0.1% fluorine surfactant, 0.1% modified silicone surfactant, 0.15% polyether-modified silicone oil, 3% conductive agent, 1% corrosion inhibitor, and 83.65% organic solvent. The resin in this example was an acrylic resin, and the product brand was Paraloid B-48N. The fluorine surfactant product brand in this example was DuPont FS31. The modified silicone surfactant in this example was a polyester-modified silicone surfactant, and the product brand was BYK 310. The polyether-modified silicone oil product brand in this example was SI-204A. The conductive agent in this example was polythiophene, and the product brand was CHTA 402. The corrosion inhibitor in this example was benzotriazole. The organic solvent in this example was ethyl acetate.

[0077] Protective film: The protective film in this example was prepared using the coating composition described above, and the components of the prepared protective film were as follows: 12 parts of Paraloid B-48N acrylic resin, 0.1 part of DuPont FS31 fluorine surfactant, 0.1 part of BYK 310 polyester-modified silicone surfactant, 0.15 part of SI-204A polyether-modified silicone oil, 1 part of benzotriazole corrosion inhibitor, and 3 parts of CHTA 402 polythiophene conductive agent.

[0078] Comparative Example 1

[0079] Coating composition components: 12% resin, 0.1% fluorine surfactant, 2.5% nanosilica surfactant, and 85.4% organic solvent. The resin in this example was an acrylic resin, and the product brand was Paraloid B-48N. The fluorine surfactant product brand in this example was DuPont FS31. The nanosilica surfactant product brand in this example was NANOPOL C764. The organic solvent in this example was ethyl acetate.

[0080] Protective film: The protective film in this example was prepared using the coating composition described above, and the components of the prepared protective film were as follows: 12 parts of Paraloid B-48N acrylic resin, 0.1 part of DuPont FS31 fluorine surfactant, and 2.5 parts of NANOPOL C764 nano-silica surfactant.

[0081] Comparative Example 2

[0082] Coating composition components: 12% resin, 0.1% fluorine surfactant, 0.1% nano-silica surfactant, 3% conductive agent, and 84.8% organic solvent. The resin in this example was an acrylic resin, and the product brand was Paraloid B-48N. The fluorine surfactant product brand in this example was DuPont FS31. The nano-silica surfactant product brand in this example was NANOPOL C764. The conductive agent in this example was polythiophene, and the product brand was CHTA 402. The organic solvent in this example was ethyl acetate.

[0083] Protective film: The protective film in this example was prepared using the coating composition described above, and the components of the prepared protective film were as follows: 12 parts of Paraloid B-48N acrylic resin, 0.1 part of DuPont FS31 fluorine surfactant, 0.1 part of NANOPOL C764 nano-silica surfactant, and 3 parts of CHTA 402 polythiophene conductive agent.

[0084] Comparative Example 3

[0085] Coating composition components: 12% resin, 0.1% fluorine surfactant, 2.5% modified silicone surfactant, 3% conductive agent, and 82.4% organic solvent. The resin in this example was an acrylic resin, and the product brand was Paraloid B-48N. The fluorine surfactant product brand in this example was DuPont FS31. The modified silicone surfactant in this example was a polyester-modified silicone surfactant, and the product brand was BYK 310. The conductive agent in this example was polythiophene, and the product brand was CHTA 402. The organic solvent in this example was ethyl acetate.

[0086] Protective film: The protective film in this example was prepared using the coating composition described above, and the components of the prepared protective film were as follows: 12 parts of Paraloid B-48N acrylic resin, 0.1 part of DuPont FS31 fluorine surfactant, 2.5 parts of BYK 310 polyester-modified silicone surfactant, and 3 parts of CHTA 402 polythiophene conductive agent.

[0087] Comparative Example 4

[0088] The coating composition components were 12% resin, 0.1% fluorosurfactant, 0.1% modified silicone surfactant, 6% conductive agent, and 81.8% organic solvent. The resin in this example was an acrylic resin, product designation Paraloid B-48N. The fluorosurfactant in this example was product designation DuPont FS31. The modified silicone surfactant in this example was a polyester modified silicone surfactant, product designation BYK 310. The conductive agent in this example was polythiophene, product designation CHTA 402. The organic solvent in this example was ethyl acetate.

[0089] The protective film in this example was prepared using the coating composition described above, and the components of the protective film prepared were as follows: 12 parts Paraloid B-48N acrylic resin, 0.1 part DuPont FS31 fluorosurfactant, 0.1 part BYK 310 polyester modified silicone surfactant, and 6 parts CHTA 402 polythiophene conductive agent.

[0090] Comparative Example 5

[0091] The coating composition components were 12% resin, 0.1% modified silicone surfactant, 3% conductive agent, and 84.9% organic solvent. The resin in this example was an acrylic resin, product designation Paraloid B-48N. The modified silicone surfactant in this example was a polyester modified silicone surfactant, product designation BYK 310. The conductive agent in this example was polythiophene, product designation CHTA 402. The organic solvent in this example was ethyl acetate.

[0092] The protective film in this example was prepared using the coating composition described above, and the components of the protective film prepared were as follows: 12 parts Paraloid B-48N acrylic resin, 0.1 part BYK 310 polyester modified silicone surfactant, and 3 parts CHTA 402 polythiophene conductive agent.

[0093] The mass parts of the components of the protective films prepared in each of the examples and comparative examples above are shown in Table 1 below:

[0094] Table 1

[0095]

[0096] The coating compositions and protective films in each of the examples and comparative examples above were tested as follows:

[0097] (1) Appearance test

[0098] The appearance of the prepared coating composition and the appearance of the protective film formed by coating are observed, and the coating composition is clear and the protective film is normal, which is a pass test.

[0099] (2) Surface resistance test

[0100] The prepared protective film is taken and a sample with a size of 10 cm x 10 cm is prepared, a four-probe resistance meter is used to test the surface resistance of 9 points on the surface of the sample, and the average value is calculated.

[0101] (3) Adhesion test

[0102] The adhesion between the protective film and the substrate and the metal layer:

[0103] After coating the above protective film with a thickness of 2 μm on the surface of the sample with a metal mesh, the adhesion between the protective film and the substrate area and the full metal mesh is tested by the crosshatch method, the specific steps are as follows: using a crosshatch knife to horizontally and vertically cut the specified area, using 3M 610 type tape to paste, after removing the bubbles, tearing off within 1 to 2 seconds, observing the peeling of the protective film in the crosshatch area, if there is no peeling, the test is passed and the test result is recorded as 5B.

[0104] The adhesion between the protective film and the optical adhesive (OCA):

[0105] The protective film is prepared on the front and back surfaces of the metal mesh conductive film, two pieces of the above conductive film with protective film are taken, and they are pasted by OCA glue, then a tensile tester is used to test the tensile value when the two layers of metal mesh conductive film are separated, and the test result is greater than 1800 gf / inch, then the test is passed.

[0106] The pulling force between the protective film and the flexible circuit board (FPC):

[0107] After the preparation of the above protective coating on the upper and lower surfaces of the metal mesh conductive film, the FPC and the link port on the metal conductive film are bound by anisotropic conductive adhesive film (ACF) through hot pressing, after binding, a tensile tester is used for destructive test, when the FPC falls off from the metal mesh conductive film, the force displayed on the tensile tester is defined as the pulling force, and when the pulling force is greater than 500 g / cm, the test is passed.

[0108] (4) Dyne value test

[0109] The surface of the protective film is tested by using A.Shine DYNE TEST type dyne pen, and the dyne value is greater than or equal to 34 mN / m, which is a pass test.

[0110] (5) Water drop angle test

[0111] The water drop angle is tested by a water drop angle tester. If the water drop angle is not more than 80°, it is qualified.

[0112] (6) Optical performance test

[0113] The transmittance, reflectance, haze and chroma b* of the metal mesh product before and after coating the protective film are tested using a lambda 850+UV ultraviolet spectrophotometer. The data before and after coating the protective film are compared. If the transmittance decreases by not more than 1%, the reflectance increases by not more than 1%, the haze increases by not more than 1%, and the chroma b* increases by not more than 0.5, it is qualified.

[0114] The test results of the appearance test, surface resistance test, adhesion test, dale value test, water drop angle test and optical performance test of Examples 1-9 are shown in Table 2 below:

[0115] Table 2

[0116]

[0117] As can be seen from the test results in Table 2, the test results of the protective film prepared in Examples 1-9 all meet the standards.

[0118] The test results of the appearance test, surface resistance test, adhesion test, dale value test, water drop angle test and optical performance test of Comparative Examples 1-5 are shown in Table 3 below:

[0119] Table 3

[0120]

[0121] As can be seen from the test results in Table 3, the addition of nano-silica surfactant in the coating composition of Comparative Example 1 can pass other tests, but the surface resistance is large. The addition of conductive agent in the coating composition of Comparative Example 2 under the premise of using nano-silica surfactant will cause the coating liquid to mist and the coating layer to visually turn white. The content of polyester-modified silicone surfactant in the coating composition of Comparative Example 3 is too high, and the protective film prepared therefrom cannot pass the adhesion test. The content of conductive agent in the composition of Comparative Example 4 is too high, which will cause the surface of the protective film coating to be sticky. The coating composition of Comparative Example 5 does not include a fluorine surfactant, but only includes a polyester-modified silicone surfactant, which can pass other tests, but the water drop angle is too large.

[0122] The protective films in Examples 1-9 and Comparative Example 1 were subjected to electrostatic discharge (ESD) test:

[0123] The metal mesh product with a mesh channel pitch of 12 μm was tested by the ESD gun after the protective film was coated, and the ESD test was performed after the cover glass was attached to the protective film by OCA glue. Specifically, the ESD gun was suspended 3 mm from the metal mesh product, and the voltage discharge was performed at 15 KV, 20 KV, 25 KV, and 30 KV, respectively, 10 times for each test, and then the metal mesh line state was observed.

[0124] The test results are shown in Table 4 below:

[0125] Table 4

[0126]

[0127] As can be seen from Table 4 above, the protective film in Comparative Example 1 applied to the metal mesh product with a mesh channel pitch of 12 μm can only pass the ESD test at 15 KV, the protective films in Examples 1 to 9 can pass the ESD test at 25 KV except for Example 5, and the protective film in Example 5 can pass the ESD test at 20 KV, which may be caused by the lower content of the conductive agent in the protective film in Example 5 compared to other examples.

[0128] Further, the protective films in Comparative Example 1, Example 1, and Example 7 were subjected to limit tests of ESD, i.e., the protective films in Comparative Example 1, Example 1, and Example 7 were coated into the metal mesh products with mesh channel pitches of 5 μm and 8 μm, respectively, and subjected to the ESD test.

[0129] Test Example 1

[0130] The protective film in Comparative Example 1 was coated into the metal mesh products with mesh channel pitches of 5 μm and 8 μm, respectively, and subjected to the ESD standard test, i.e., the contact discharge test at 8 kV and the air discharge test at 15 kV. The sample with a mesh channel pitch of 5 μm failed to pass the standard test, and the sample with a mesh channel pitch of 8 μm passed the standard test. However, for the sample with a mesh channel pitch of 8 μm, only independent tests under each test condition could pass the test, and the contact discharge and the air discharge could not be tested on the same sample.

[0131] The sample with a mesh channel pitch of 8 μm was subjected to the ESD test with a stepwise voltage increase, and the test results were that the contact discharge limit was 14 kV and the air discharge limit was 18 kV.

[0132] Test Example 2

[0133] The protective film in Example 1 was coated into the metal mesh products with mesh channel pitches of 5 μm and 8 μm, respectively, and subjected to the ESD standard test, and both the sample with a mesh channel pitch of 5 μm and the sample with a mesh channel pitch of 8 μm passed the standard test.

[0134] The 5 μm sample and the 8 μm sample are subjected to the step voltage increase ESD test respectively. The test result of the 8 μm sample is that the contact discharge limit is above 14 kV, and the air discharge limit is 22 kV. The test result of the 5 μm sample is that the contact discharge limit is above 14 kV, and the air discharge limit is 18 kV. It can be seen that the protective film in Example 1 can obviously improve the breakdown resistance of the metal mesh, can effectively reduce the mesh channel of the metal mesh from 12 μm to 5 μm, and can better improve the appearance effect of the metal mesh under the premise of meeting the performance requirements.

[0135] Test Example 3

[0136] The protective film in Example 7 is coated into the metal mesh product with the mesh channel spacing of 5 μm and 8 μm respectively, and the ESD standard test is performed. The 5 μm sample and the 8 μm sample can both pass the standard test.

[0137] The 5 μm sample and the 8 μm sample are subjected to the step voltage increase ESD test respectively. The test result of the 8 μm sample is that the contact discharge limit is above 14 kV, and the air discharge limit is 22 kV. The test result of the 5 μm sample is that the contact discharge limit is above 14 kV, and the air discharge limit is 18 kV. It can be seen that the protective film in Example 7 can obviously improve the breakdown resistance of the metal mesh, can effectively reduce the mesh channel of the metal mesh from 12 μm to 5 μm, and can better improve the appearance effect of the metal mesh under the premise of meeting the performance requirements.

[0138] The technical features of the above-described embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the description.

[0139] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims, and the description can be used to explain the content of the claims.

Claims

1. A metal mesh characterized in that, The application relates to a metal mesh line and a protective film. The protective film is prepared by a coating composition. The coating composition comprises the following components in mass fractions: 10-30 parts of a resin, 0.1-0.5 parts of a fluorine surfactant, 0.1-1 parts of a modified silicone surfactant, 1-3 parts of a conductive agent, and 65.5-88.8 parts of an organic solvent. The resin is an acrylic resin; the modified silicone surfactant comprises at least one of a polyester modified silicone surfactant and a polyether modified silicone oil; and the conductive agent comprises at least one of polypyrrole and polythiophene. The modified silicone surfactant comprises the polyester modified silicone surfactant and the polyether modified silicone oil, the mass fraction of the polyester modified silicone surfactant is 0.1-0.5 parts, and the mass fraction of the polyether modified silicone oil is 0.1-0.5 parts.

2. The metal grid of claim 1, wherein, The organic solvent comprises at least one of ethyl lactate, ethyl acetate, propyl acetate, butyl acetate, propylene glycol monomethyl ether and propylene glycol methyl ether acetate.

3. The metal grid of claim 1, wherein, The coating composition further comprises an inhibitor in a mass fraction of 0.5-2 parts.

4. The metal grid according to any one of claims 1 to 3, characterized in that The inhibitor comprises at least one of triazole, thiazole and quinoline.

5. The metal grid of claim 4, wherein, ​

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