Preparation process and product of touch panel mylar

Abstract

The invention relates to the field of touchpad film materials, and discloses a preparation process of a touchpad mylar and a product. The preparation process of the touch panel mylar comprises the following steps: S1, transferring a texture layer on one side surface of a base material layer by using UV transfer printing glue; s2, carrying out three times of silk-screen printing on the other side surface of the base material layer to sequentially form a first metal ink layer, a second metal ink layer and an insulating ink layer; s3, performing vacuum coating on the texture layer to form a wear-resistant anti-fingerprint layer; and S4, adhering an adhesive layer with a release film to the insulating ink layer, and performing die cutting to obtain the touch panel mylar. The prepared touchpad mylar has good metal texture, wear resistance, smoothness and insulativity, the ink layer and the base material layer are stably attached, the ink layer is not prone to falling off and layering under the use conditions of long-term environment temperature and frequent screen touching of the touchpad mylar, and the touch sensitivity is good.

Description

Technical Field

[0001] This application relates to the field of touchpad film materials, and in particular to a process for preparing touchpad Mylar and a product thereof. Background Technology

[0002] Touchpad Mylar film is a protective film used for touch screens. It is attached tightly to the surface of the touchpad (pressure-sensitive panel) and has good wear resistance, scratch resistance and insulation properties without affecting touch sensitivity. It isolates the static electricity generated by fingers from the touchpad circuitry, preventing electrostatic discharge or short circuits and extending the life of the touchpad. It is widely used in modern electronic products such as laptops, tablets, and touchscreen smartphones.

[0003] The core structure of existing touchpad Mylar sheets is mainly based on transparent PET or transparent PC as the substrate, with a light-shielding ink with metallic texture and insulating properties coated on one side of the substrate. This type of touchpad Mylar sheet has good insulation properties.

[0004] However, under long-term environmental temperature and frequent touch screen use, the Mylar film of this touch panel will frequently experience elastic stress deformation in certain areas. This can cause the ink layer to easily peel off and separate during touch screen operation, reducing the protective performance and sensitivity of the touch screen, and consequently shortening the lifespan of electronic products. Summary of the Invention

[0005] To address the issue that the ink layer of existing touchpad Mylar sheets is prone to peeling and separation during touchscreen use under long-term ambient temperature and frequent touch conditions, which reduces the protective performance and sensitivity of the touchscreen and consequently shortens the lifespan of electronic products, this application provides a manufacturing process and product for touchpad Mylar sheets.

[0006] Firstly, this application provides a manufacturing process for a touchpad Mylar, employing the following technical solution: A manufacturing process for a touchpad Mylar includes the following steps: S1. A textured layer is formed by transferring UV transfer adhesive onto one side of the substrate layer; S2. Perform three screen printing operations on the other side of the substrate layer to form a first metal ink layer, a second metal ink layer and an insulating ink layer in sequence. S3. Vacuum coating is applied to the surface of the texture layer to form a wear-resistant and fingerprint-resistant layer; S4. A release film adhesive layer is laminated onto the surface of the insulating ink layer, and then die-cut to obtain the touch panel Mylar.

[0007] By adopting the above technical solution, in step S1, a textured layer with a frosted texture is formed on one side of the substrate layer using UV transfer adhesive, which improves the texture and wear resistance of the touch panel Mylar. In step S2, a first metallic ink layer, a second metallic ink layer, and an insulating ink layer are formed sequentially on the other side of the substrate layer by screen printing. The screen printing makes the first metallic ink layer and the second metallic ink layer adhere to each other and stably attach to the substrate layer, giving the touch panel Mylar an excellent metallic texture. The insulating ink layer is attached to the surface of the two metallic ink layers, giving the touch panel Mylar good insulation and light-shielding properties. In step S3, a wear-resistant and fingerprint-resistant layer is formed on the surface of the textured layer. Through the synergy between the textured layer and the wear-resistant and fingerprint-resistant layer, the touch panel Mylar is given excellent wear resistance and smoothness. In step S4, an adhesive layer with a release film is laminated onto the surface of the insulating ink layer and die-cut, which facilitates the assembly of the touch panel Mylar with other electronic components and also protects the insulating ink layer. In summary, the touchpad Mylar produced by the manufacturing process of this application has good wear resistance and smoothness, a metallic texture, insulation and light-blocking properties, and stable adhesion between the substrate layer and the ink layer. Under long-term environmental temperature and frequent touch screen use conditions, it is not easy to fall off or delaminate, and has relatively stable touch screen sensitivity.

[0008] Preferably, the total thickness of the first metal ink layer, the second metal ink layer and the insulating ink layer is 20-45 μm.

[0009] Preferably, the thickness of the first metallic ink layer is 7-15 μm, the thickness of the second metallic ink layer is 7-15 μm, and the thickness of the insulating ink layer is 6-15 μm.

[0010] By adopting the above technical solution and optimizing the thickness of the first metal ink layer, the second metal ink layer and the insulating ink layer, it is possible to ensure that the touch panel Mylar has a good metallic texture, light shielding and insulation, while maintaining good adhesion stability under the screen printing process, and is not prone to peeling and separation, thereby improving the touch sensitivity of the touch panel Mylar.

[0011] Preferably, the first metallic ink layer is obtained by curing a first metallic ink, the second metallic ink layer is obtained by curing a second metallic ink, and the insulating ink layer is obtained by curing an insulating ink. Preferably, the first metallic ink, the second metallic ink, and the insulating ink are all composed of 90-95 wt% acrylic base ink and 5-10 wt% ink thinner, wherein the ink thinner is prepared from the following raw materials in parts by weight: 15-25 parts glycidyl methacrylate 3-6 parts of triallyl cyanurate 5-10 parts of polyethylene glycol monomethyl ether acrylate 2-6 parts of 4-hydroxybutylacrylate glycidyl ether Pigment 0.2-0.5 parts.

[0012] By adopting the above technical solution and using acrylic-based ink as the base for the ink layer, the ink layer can better adhere to the substrate layer and remain stable under long-term temperature and frequent use conditions. Adding ink modifiers can adjust the ink's viscosity, drying speed, and flexibility. The resulting first metallic ink layer, second metallic ink layer, and insulating ink layer better meet printing and usage requirements, are more suitable for industrial continuous printing, offer convenient operation, and further improve the quality and stability of the touchpad's Mylar.

[0013] Specifically, glycidyl methacrylate in the ink modifier exhibits good reactivity and adhesion, enhancing the bonding strength between ink layers and between the ink layer and the substrate layer. Triallyl cyanurate provides excellent heat resistance and strength stability, reinforcing the strength of the ink layer. Polyethylene glycol monomethyl ether acrylate and 4-hydroxybutyl acrylate glycidyl ether possess good wetting and flexibility; their combined use helps improve ink flow and printability. These raw materials work synergistically, resulting in ink layers composed of this ink modifier exhibiting better dispersion uniformity, adhesion, flexibility, and abrasion resistance. This further enhances the bonding stability between the ink layer and the substrate, leading to a more stable bond between the substrate layer and the ink layer in the resulting touchpad under long-term ambient temperature and frequent touchscreen use, reducing the likelihood of peeling or delamination.

[0014] Preferably, the acrylic base ink is prepared from 20-30 parts of acrylic resin, 12-18 parts of polyurethane acrylate resin, 8-25 parts of filler, 6-12 parts of diluent monomer, 1-3 parts of leveling agent, 0.1-0.3 parts of defoamer, 30-40 parts of solvent and 0.2-0.4 parts of curing agent. The filler in the first metallic ink and the second metallic ink is aluminum powder, and the filler in the insulating ink is silica.

[0015] By adopting the above technical solutions, acrylic resin possesses excellent weather resistance, chemical corrosion resistance, and adhesion, which can improve the bonding stability of the ink layer; polyurethane acrylate resin has high flexibility and abrasion resistance, which can enhance the flexibility and bonding stability of the ink layer; aluminum powder is used as a filler in the first and second metallic inks to ensure a good metallic texture for the touch panel Mylar; silica is used as a filler in the insulating ink to give the touch panel Mylar excellent light-blocking and insulation properties; diluent monomers can adjust the viscosity of the ink, facilitating screen printing; leveling agents can make the ink flow better during the printing process, forming a smooth ink layer; defoamers can eliminate air bubbles in the ink, ensuring the quality of the ink layer; solvents help dissolve the components, giving the ink suitable fluidity; curing agents can make the ink cure quickly, improving the stability of the ink layer, thereby giving the resulting touch panel Mylar good flexibility and bonding stability.

[0016] Preferably, the thickness of the texture layer is 20-40 μm.

[0017] By adopting the above technical solution, a textured layer of optimal thickness can give the touchpad Myla excellent texture and improve the smooth touch of the touchpad Myla.

[0018] Preferably, the thickness of the wear-resistant and fingerprint-resistant layer is 10-45 nm.

[0019] By adopting the above technical solution, a wear-resistant and fingerprint-resistant layer of optimal thickness can be uniformly and stably attached to the surface of the texture layer, giving the touchpad Myla excellent fingerprint resistance and wear-resistant smoothness.

[0020] Preferably, the thickness of the adhesive layer is 25-50 μm.

[0021] By adopting the above technical solution, the adhesive layer with a better thickness has better air release properties during the bonding process, which enables the touch panel Mylar to be stably bonded and assembled with other electronic components, thereby improving bonding stability.

[0022] Secondly, this application provides a touchpad Mylar, which adopts the following technical solution: A touchpad Mylar, prepared using the above-described manufacturing process.

[0023] By adopting the above technical solution, the touch panel Mylar prepared by the manufacturing process of this application has good wear resistance and smoothness, rich metallic texture, insulation and light blocking properties, and stable adhesion between the substrate layer and the ink layer. Under long-term environmental temperature and frequent touch screen use conditions, it is not easy to fall off or delaminate, and has relatively stable touch screen sensitivity.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. The manufacturing process of the touchpad Myla of this application involves transferring a textured layer to one side of a substrate layer, then screen printing a first metallic ink layer, a second metallic ink layer, and an insulating ink layer on the other side of the substrate layer. A wear-resistant and fingerprint-resistant layer is then vacuum-deposited onto the textured layer surface. Finally, an adhesive layer with a release film is attached to the insulating ink layer surface. The resulting touchpad Myla exhibits good wear resistance and smoothness, a metallic texture, insulation, and light-blocking properties. The substrate layer and ink layer adhere stably, and under long-term ambient temperature and frequent touchscreen use conditions, it is not prone to peeling or delamination, resulting in relatively stable touchscreen sensitivity.

[0025] 2. The first metallic ink layer, the second metallic ink layer, and the insulating ink layer are printed with optimal thicknesses, which allows the ink layers to adhere stably while giving the touchpad Myra excellent metallic texture, light-blocking properties, and insulation. The three ink layers work together to buffer each other, making it less likely for the touchpad Myra to peel off or separate during long-term and frequent use.

[0026] 3. The first metallic ink layer, the second metallic ink layer, and the insulating ink layer are all composed of acrylic base ink and ink modifier. The ink modifier is made of glycidyl methacrylate, triallyl cyanurate, polyethylene glycol monomethyl ether acrylate, 4-hydroxybutyl acrylate glycidyl ether, and colorant, which improves the adhesion stability between the ink layer and the substrate, thereby making the ink layer less prone to peeling and delamination under long-term temperature and frequent use conditions. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the embodiments.

[0028] The following are some of the sources and specifications of the raw materials used in this application. The raw materials used in the preparation examples and embodiments of this application can all be obtained commercially, including but not limited to the following models and manufacturers of raw materials. Raw materials with equivalent performance can also be used: 1. Aluminum powder: particle size 2-5μm; 2. Silica: Fumed silica, particle size 50-100nm; 3. Triallyl cyanurate: CAS No. 101-37-1, content 99%; 4. Polyethylene glycol monomethyl ether acrylate: CAS No. 32171-39-4, content 99%; 5. Acrylic resin: BASF JONCRYL 678; 6. Polyurethane acrylate resin: EBECREL 4491.

[0029] Example of ink preparation Preparation Example 1 Preparation Example 1 discloses an ink conditioner, which is prepared by the following steps: 1.5 kg glycidyl methacrylate, 0.3 kg triallyl cyanurate, 0.5 kg polyethylene glycol monomethyl ether acrylate, 0.6 kg 4-hydroxybutyl acrylate glycidyl ether, and 0.02 kg pigment were mixed evenly at a temperature of 45°C to prepare an ink adjuster.

[0030] Preparation Examples 2-3 The difference between Preparation Example 2-3 and Preparation Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 1 below.

[0031] Table 1. Parameters for Preparation Examples 1-3 Preparation Example 4 The difference between Preparation Example 4 and Preparation Example 1 is that triallyl cyanurate is replaced with glycidyl methacrylate in equal amounts, while the rest is the same as Preparation Example 1.

[0032] Preparation Example 5 The difference between Preparation Example 5 and Preparation Example 1 is that 4-hydroxybutyl acrylate glycidyl ether is replaced with polyethylene glycol monomethyl ether acrylate in equal amounts, while the rest is the same as Preparation Example 1.

[0033] Preparation Example 6 The difference between Preparation Example 6 and Preparation Example 1 is that polyethylene glycol monomethyl ether acrylate is replaced with glycidyl methacrylate in equal amounts, while the rest is the same as Preparation Example 1. Example

[0034] Example 1 Example 1 discloses a manufacturing process for a touchpad Mylar, including the following steps: S1. Using a 0.25mm thick PC transparent film as the substrate layer, a texture layer is formed on one side of the substrate layer using UV transfer adhesive. The thickness of the texture layer is 20-40μm. In this embodiment, the thickness of the texture layer is 20μm. S2. First, screen printing is performed on the other side of the substrate layer using the first metallic ink, and dried at 80°C for 40 minutes to form the first metallic ink layer. Then, screen printing is performed on the first metallic ink layer using the second metallic ink, and dried at 80°C for 40 minutes to form the second metallic ink layer. Finally, insulating ink is screen printed on the second metallic ink layer, and dried at 80°C for 1 hour to form the insulating ink layer. The screen mesh count for screen printing is 300-500 mesh, and in this embodiment, the screen mesh count is 300 mesh. The total thickness of the three ink layers is 20-45 μm, wherein the thickness of the first metallic ink layer is 7-15 μm, the thickness of the second metallic ink layer is 7-15 μm, and the thickness of the insulating ink layer is 6-15 μm. In this embodiment, the thickness of the first metallic ink layer is 10 μm, the thickness of the second metallic ink layer is 10 μm, and the thickness of the insulating ink layer is 12 μm.

[0035] S3. Vacuum coating is performed on the surface of the texture layer using a wear-resistant agent to form a wear-resistant and fingerprint-resistant layer. The thickness of the wear-resistant and fingerprint-resistant layer is 10-45nm, and the thickness of the wear-resistant and fingerprint-resistant layer in this embodiment is 15nm. S4. An adhesive layer with a release film is formed on the surface of the insulating ink layer. The adhesive layer with the release film is PET acrylic mesh adhesive. The thickness of the adhesive layer is 25-50μm. In this embodiment, the thickness of the double-sided adhesive is 50μm. Then, the corresponding edge positions are die-cut to obtain the touch panel Mylar. Among them, the UV transfer adhesive is a commercially available UV transfer adhesive, Gaotu, model 3318B; The wear-resistant agent is commercially available AF anti-fingerprint oil, Jialede Chemical YBS-8220; The first metallic ink, the second metallic ink, and the insulating ink are all composed of 9 kg of acrylic base ink and 1 kg of ink adjuster prepared in Preparation Example 1; The acrylic-based ink is prepared from 2 kg of acrylic resin, 1.2 kg of polyurethane acrylate resin, 0.8 kg of filler, 0.6 kg of diluent monomer (composed of methyl methacrylate, isooctyl acrylate, and β-hydroxyethyl methacrylate in a ratio of 1:1:2), 0.1 kg of leveling agent, 0.01 kg of defoamer, 3 kg of solvent, and 0.02 kg of curing agent (composed of dicyclohexyl peroxide and dilauryl peroxide in a ratio of 3:1). The filler in the first and second metallic inks is aluminum powder, and the filler in the insulating ink is silica. The leveling agent is BYK-333 leveling agent, the defoamer is silicone defoamer DIG810, and the solvent is ethyl acetate.

[0036] Example 2-3 The difference between Examples 2-3 and Example 1 is that the amount of raw materials and the preparation conditions are different. Everything else is the same as Example 1. See Table 2 below for details.

[0037] Table 2. Parameter differences between Examples 1-3 Examples 4-6 The difference between Examples 4-6 and Example 1 is that the source of the ink adjuster is different, as detailed in Table 3 below.

[0038] Table 3. Source of ink conditioning agents in Examples 4-6 Example Source table of ink thinner Example 4 Preparation Example 4 Example 5 Preparation Example 5 Example 6 Preparation Example 6 Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that screen printing in step S1 is replaced with roller coating, while the rest is the same as Example 1.

[0039] Performance testing The performance of the touchpad Myra prepared in Examples 1-6 and Comparative Example 1 was tested below: 1. Adhesion test 1) Initial test at 25℃: For the ink layer of the touch panel Mylar without adhesive layer, a 100-cross test was performed. 3M 600 test tape was used to test the same position three times, and the adhesion level of the ink layer was recorded. 2) Place the touch panel Mylar without the adhesive layer in an environment with a temperature of 85℃ and a humidity of 85% for 7 days. Perform a cross-cut adhesion test on the ink layer of the touch panel Mylar. Use 3M 600 test tape to test the same position three times and record the adhesion level of the ink layer. 2. Capacitance test Using a capacitance tester, the touchpad Mylar is fixed inside the test equipment fixture and tested. A capacitance value of less than 0.3pF is considered qualified. Test and record the test results. The following are the performance test data for Examples 1-6 and Comparative Example 1, as detailed in Table 4 below.

[0040] Table 4 Performance data of the touchpad Myra from Examples 1-6 and Comparative Example 1 Combining Examples 1-3 and Examples 4-6 with Table 4, it can be concluded that the touch panel Mylar prepared using the ink modifier of this application exhibits good insulation properties and is less prone to peeling and separation under long-term use in high-temperature environments, while also demonstrating high touch sensitivity. Compared to Example 1, Examples 4-6 changed the type of ink modifier, resulting in increased capacitance values ​​in the prepared touch panel Mylar, indicating reduced insulation. Furthermore, the adhesion level decreased after the damp heat test, possibly because the ink modifier affected the uniformity and smoothness of the ink layer, reducing the uniformity of filler dispersion and thus lowering the performance of the touch panel Mylar.

[0041] Based on Example 1 and Comparative Example 1, and in conjunction with Table 4, it can be concluded that, compared to Example 1, replacing the screen printing ink layer with roller coating in Comparative Example 1 resulted in an increase in the capacitance value of the touch panel Mylar and a decrease in the adhesion grade after a damp heat test. This indicates that the touch panel Mylar produced using the ink layer of this application combined with the screen printing process has better surface smoothness and adhesion stability, thereby improving the insulation of the touch panel Mylar.

[0042] 3. Abrasion resistance and fingerprint resistance test 1) Test of dynamic friction coefficient The coefficient of dynamic friction of the wear-resistant and fingerprint-resistant layer of the touchpad Mylar prepared in Example 1 was tested and the test results were recorded using a dynamic friction coefficient tester. 2) Water droplet angle test The water droplet angle of the wear-resistant and fingerprint-resistant layer of the touchpad Mylar prepared in Example 1 was tested and the test results were recorded using a water droplet angle tester. 3) Rubber friction test Use an abrasion tester with a load of 500g, and a FABER-CASTELL7017R abrasion test eraser with a stroke of 25mm. Perform the wiping test at a speed of 40 times / min for 100 rounds. Record the degree of transparency of the abrasion-resistant and fingerprint-resistant layer. Test and record the test results. The following are the performance test data of the wear-resistant and fingerprint-resistant layer of the touchpad Mylar obtained in Example 1. Please refer to Table 5 below for details.

[0043] Table 5 Performance data of the wear-resistant and fingerprint-resistant layer of the touchpad Mylar in Example 1 Based on Example 1 and Table 5, it can be concluded that the touchpad Myra of this application has good wear resistance, fingerprint resistance and smoothness.

[0044] In summary, the touchpad Mylar obtained in this application has good wear resistance, fingerprint resistance and smoothness, a metallic texture, insulation and light-blocking properties, and stable adhesion between the substrate layer and the ink layer. Under long-term environmental temperature and frequent touch screen use conditions, it is not easy to fall off or delaminate, and has relatively stable touch screen sensitivity.

[0045] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A manufacturing process for a touchpad Mylar, characterized in that, Includes the following steps: S1. A textured layer is formed by transferring UV transfer adhesive onto one side of the substrate layer; S2. Perform three screen printing operations on the other side of the substrate layer to form a first metal ink layer, a second metal ink layer and an insulating ink layer in sequence. S3. Vacuum coating is applied to the surface of the texture layer to form a wear-resistant and fingerprint-resistant layer; S4. A release film adhesive layer is laminated onto the surface of the insulating ink layer, and then die-cut to obtain the touch panel Mylar.

2. The manufacturing process of a touchpad Mylar according to claim 1, characterized in that, The total thickness of the first metallic ink layer, the second metallic ink layer, and the insulating ink layer is 20-45µm.

3. The manufacturing process of a touchpad Mylar according to claim 2, characterized in that, The thickness of the first metallic ink layer is 7-15µm, the thickness of the second metallic ink layer is 7-15µm, and the thickness of the insulating ink layer is 6-15µm.

4. The manufacturing process of a touchpad Mylar according to any one of claims 1-3, characterized in that, The first metallic ink layer is obtained by curing a first metallic ink, the second metallic ink layer is obtained by curing a second metallic ink, and the insulating ink layer is obtained by curing an insulating ink.

5. The manufacturing process of a touchpad Mylar according to claim 4, characterized in that, The first metallic ink, the second metallic ink, and the insulating ink are all composed of 90-95 wt% acrylic base ink and 5-10 wt% ink thinner, wherein the ink thinner is prepared from the following raw materials in parts by weight: 15-25 parts glycidyl methacrylate 3-6 parts of triallyl cyanurate 5-10 parts of polyethylene glycol monomethyl ether acrylate 2-6 parts of 4-hydroxybutylacrylate glycidyl ether Pigment 0.2-0.5 parts.

6. The manufacturing process of a touchpad Mylar according to claim 5, characterized in that, The acrylic-based ink is prepared from 20-30 parts of acrylic resin, 12-18 parts of polyurethane acrylate resin, 8-25 parts of filler, 6-12 parts of diluent monomer, 1-3 parts of leveling agent, 0.1-0.3 parts of defoamer, 30-40 parts of solvent and 0.2-0.4 parts of curing agent. The filler in the first metallic ink and the second metallic ink is aluminum powder, and the filler in the insulating ink is silica.

7. The manufacturing process of a touchpad Mylar according to claim 1, characterized in that, The thickness of the texture layer is 20-40µm.

8. The manufacturing process of a touchpad Mylar according to claim 1, characterized in that, The thickness of the wear-resistant and fingerprint-resistant layer is 10-45nm.

9. The manufacturing process of a touchpad Mylar according to claim 1, characterized in that, The thickness of the adhesive layer is 25-50µm.

10. A touchpad Mylar, characterized in that, It is prepared by the preparation process described in any one of claims 1-9.

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