Continuous supply and deposition system for fingerprint-resistant film raw material for vacuum coating

Abstract

The application discloses a kind of for winding vacuum coating anti-fingerprint film raw material continuous supply and deposition system, comprising: discharging unit, medium unit, evaporation unit and receiving unit;The medium unit with anti-fingerprint coating solution is adsorbed in the inside winding between the discharging unit and receiving unit, the medium unit is continuously provided to the evaporation unit by the action of the discharging unit and receiving unit, so that the anti-fingerprint coating solution in the medium unit is heated and evaporated onto the target film material.The anti-fingerprint film raw material continuous supply and deposition system for winding vacuum coating provided by the application adopts evaporation organic medium mode instead of traditional pill evaporation feeding mode, which can realize uninterrupted anti-fingerprint film raw solution supply, not only guarantees continuous industrial production, but also avoids the phenomenon that traditional evaporation blocking mode causes coating chamber to be contaminated due to frequent replacement of AF pills, greatly improves enterprise production efficiency and improves product economic benefits.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to a continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating. Background Technology

[0002] With the rapid development of consumer electronics such as automotive displays, smartphones, and VR / AR, the design and application of optical films have seen explosive growth in demand. Because the surface of optical films is sensitive to the external environment, an anti-fingerprint (AF) coating is typically added to the surface to provide hydrophobic / oleophobic, stain-resistant, scratch-resistant, and even antibacterial effects. Currently, the mainstream dry evaporation process for anti-fingerprint films uses a barrier boat to deposit anti-fingerprint film pellets. The barrier boat technique involves evaporating pellets from an evaporation source and then condensing them onto the surface of an upper substrate to form a film.

[0003] A heat-resistant boat is heated by connecting it to a power source, thereby heating and evaporating the film material carried inside the boat. Patent CN 212199399 U discloses a film deposition structure where a tungsten wire is bent into an inverted U-shape at the center, and the entire tungsten wire is wrapped with a spiral aluminum structure, with the inner ring of each aluminum ring in contact with the tungsten wire. This deposition mechanism is simple, but under prolonged deposition conditions, the heating wires tend to alloy with each other, adhering to the substrate and affecting film quality. Patent CN113373411 A provides a deposition source unit, deposition source, and nozzle for the deposition source that can maintain a high film formation rate while ensuring the directional nature of the evaporated material. However, this component has very high requirements for industrial manufacturing capabilities and cost, which is not conducive to industrial production. Furthermore, the non-continuous raw material supply, non-uniform film surface evaporation rate, and intermittent manual feeding defects in the heat-resistant mechanism lead to low efficiency in continuous roll-to-roll deposition. From the perspective of enterprise production efficiency and economic benefits, the development and improvement of the continuous anti-fingerprint film raw material supply and deposition mechanism in roll-to-roll vacuum coating equipment is of great significance.

[0004] Therefore, it is now necessary to improve existing technologies to provide more reliable solutions. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating, which addresses the shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating, comprising: a feeding unit, a medium unit, an evaporation unit, and a receiving unit; the medium unit, which adsorbs anti-fingerprint coating liquid inside, is wound between the feeding unit and the receiving unit, and the medium unit is continuously supplied to the evaporation unit through the action of the feeding unit and the receiving unit, so that the anti-fingerprint coating liquid inside the medium unit is heated and evaporated onto the target film material.

[0007] Preferably, the material of the media unit is polypropylene, polyamide, or modified polydimethylsiloxane.

[0008] Preferably, the material of the mediating unit is modified polydimethylsiloxane, which is prepared by the following method:

[0009] S1. Mix the polydimethylsiloxane prepolymer (the main agent and the curing agent are mixed uniformly at a mass ratio of 10:1) and stir for 1-3 hours;

[0010] S2. Mix the product from step S1 with an organic pore-forming agent, degas under vacuum, heat, and then injection mold.

[0011] S3. Add the product obtained in step S2 to hydrogen peroxide solution, soak, remove, and obtain the medium unit material.

[0012] Preferably, the curing agent is one or more of siloxane / polysiloxane resins.

[0013] Preferably, the organic pore-forming agent is one or more of polyethylene glycol, polyvinyl alcohol, and polyvinyl butyral.

[0014] Preferably, the media unit is prepared by the following method:

[0015] S1. Mix the polydimethylsiloxane prepolymer (the main agent and the curing agent are mixed uniformly at a mass ratio of 10:1) magnetically for 1-3 hours at 30°C and 45%RH.

[0016] The polydimethylsiloxane prepolymer comprises a main agent and a curing agent in a mass ratio of 10:1. The main agent comprises 64-66 wt% methyl vinylcyclosiloxane, 32-33 wt% dimethylvinyl silica and / or trimethyl silica, and 0.19-0.2 wt% ethylbenzene. The curing agent comprises 55%-65 wt% dimethyl-methylhydrogen (siloxane and polysiloxane), 22%-27 wt% hydrogen-terminated dimethyl (siloxane and polysiloxane), 11%-14 wt% dimethylvinyl silica and / or trimethyl silica, and 1%-3 wt% methyl vinylcyclosiloxane.

[0017] S2. Mix the product from step S1 with an organic pore-forming agent, degas under vacuum, heat to 100°C, then raise the temperature to 150°C at a rate of 10°C / min, hold for 30 minutes, and then injection mold.

[0018] S3. Add the product obtained in step S2 to a hydrogen peroxide solution with a mass fraction of 5-10% at 40-50℃, soak for 10 minutes, and then remove it to obtain the media unit material.

[0019] Preferably, the evaporation unit provides a vapor deposition temperature of 100-250°C and 10 -3 Vacuum degree of vapor deposition (Pa);

[0020] The feeding speed of the feeding unit is controlled at 0.1-1 m / min; the receiving speed of the receiving unit is controlled at 0.1-1 m / min.

[0021] Preferably, the medium unit is subjected to an immersion treatment to allow it to absorb the anti-fingerprint coating liquid. The immersion treatment method is as follows: the medium unit is immersed in an anti-fingerprint coating liquid with a mass fraction of 0.5-3% for 10-30 minutes, and then dried at 70-90°C.

[0022] Preferably, the anti-fingerprint coating liquid comprises perfluoropolyether and perfluorocyclic ether, wherein the mass fraction of perfluoropolyether is 1-4%.

[0023] Preferably, the continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating further includes a tension control unit disposed between the unloading unit and the receiving unit.

[0024] The beneficial effects of this invention are:

[0025] The present invention provides a continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating. It adopts an organic medium vapor deposition method instead of the traditional pellet evaporation feeding method, which can realize uninterrupted supply of anti-fingerprint film raw materials. This not only ensures continuous industrial production, but also avoids the phenomenon of contamination of the coating chamber caused by frequent replacement of AF pellets in the traditional anti-evaporation method. This greatly improves the production efficiency of enterprises and enhances the economic benefits of products.

[0026] In this invention, a medium unit made of a special material is used to continuously supply the anti-fingerprint coating liquid, thereby achieving the effect of automatically adding AF liquid. This is easy to operate, convenient, and efficient. The medium unit material has a honeycomb-like porous structure, a large specific surface area, strong adsorption capacity, and is reusable. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating according to the present invention;

[0028] Figure 2 The images show the microstructure and partial scanning electron microscope images of the media unit material prepared in Example 1 of this invention.

[0029] Figure 3 The stress-strain curve of PDMS, the medium unit material prepared in Example 1 of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1—Discharging unit; 2—Tension control unit; 3—Media unit; 4—Evaporation unit; 5—Receiving unit. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to embodiments, so that those skilled in the art can implement it based on the description.

[0033] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0034] Unless otherwise specified, the experimental methods used in the following examples are conventional methods. Unless otherwise specified, the materials and reagents used in the following examples are commercially available. For examples where specific conditions are not specified, conventional conditions or conditions recommended by the manufacturer are followed. For reagents or instruments whose manufacturers are not specified, they are all commercially available products.

[0035] Reference Figure 1 This invention provides a continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating, comprising: a feeding unit 1, a tension control unit 2, a medium unit 3, an evaporation unit 4, and a receiving unit 5; the medium unit 3, which adsorbs anti-fingerprint coating liquid inside, is wound between the feeding unit 1 and the receiving unit 5, and the medium unit 3 is continuously supplied to the evaporation unit 4 through the action of the feeding unit 1 and the receiving unit 5, so that the anti-fingerprint coating liquid inside the medium unit 3 is heated and evaporated onto the target film material.

[0036] In a preferred embodiment, the feeding unit 1 includes components such as a feeding roller. The feeding roller is driven by a servo motor, which controls the feeding speed. The material of the feeding unit 1 needs to have good corrosion resistance, high strength, thermal stability, and wear resistance. 201, 304, and 316 stainless steel can be selected, with 304 and 316 stainless steel being preferred, and 316 stainless steel being more preferred. The feeding speed is controlled at 0.1-1 m / min.

[0037] In a preferred embodiment, the tension control unit 2 comprises several tension rollers to apply appropriate tension, ensuring that the medium does not loosen or deform during transmission. During operation, the tension is controlled between 40-80 N.

[0038] In a preferred embodiment, the evaporation unit 4 controls the evaporation temperature via a heating wire to ensure that the anti-fingerprint coating liquid inside the medium unit 3 is successfully evaporated onto the film material. The evaporation process parameters are: evaporation vacuum degree 10⁻³ Pa, evaporation temperature 100-250℃, and evaporation medium travel speed 0.1-1.0 m / min.

[0039] In a preferred embodiment, the receiving unit 5 includes components such as a receiving roller, used to recycle the medium unit 3 after vapor deposition. The material of the receiving unit 5 needs to have good corrosion resistance, high strength, thermal stability, and wear resistance. 201, 304, and 316 stainless steel can be selected, preferably 304 or 316 stainless steel, and more preferably 316 stainless steel. The receiving speed is controlled at 0.1-1 m / min.

[0040] In a preferred embodiment, the material of the mediating unit 3 is polypropylene, polyamide, or modified polydimethylsiloxane. In a further preferred embodiment, the material of the mediating unit 3 is modified polydimethylsiloxane, which is prepared by the following method:

[0041] S1. Mix polydimethylsiloxane (PDMS) prepolymer (main agent and curing agent are mixed at a mass ratio of 10:1) magnetically for 1-3 hours at 30°C and 45% RH. The curing agent includes, but is not limited to, one or more aliphatic polyamines, alicyclic polyamines, low molecular weight polyamides, modified aromatic amines, and resins. The secondary crosslinking effect of PDMS and the curing agent can be used to improve and control the Young's modulus of PDMS, thereby increasing its elasticity. In a preferred embodiment, the polydimethylsiloxane prepolymer comprises a main agent and a curing agent in a mass ratio of 10:1. The main agent comprises 64-66 wt% methyl vinylcyclosiloxane, 32-33 wt% dimethylvinyl silica and / or trimethyl silica, and 0.19-0.2 wt% ethylbenzene. The curing agent comprises 55%-65 wt% dimethyl-methylhydrogen (siloxane and polysiloxane), 22%-27 wt% hydrogen-terminated dimethyl (siloxane and polysiloxane), 11%-14 wt% dimethylvinyl silica and / or trimethyl silica, and 1%-3 wt% methyl vinylcyclosiloxane.

[0042] S2. The product from step S1 is mixed with an organic pore-forming agent, vacuum degassed, heated to 100°C, and then increased to 150°C at a rate of 10°C / min, held for 30 minutes, and then injection molded. The organic pore-forming agent is one or more of polyethylene glycol, polyvinyl alcohol, and polyvinyl butyral. Due to the weak thermal stability of the pore-forming agent, it escapes entirely in gaseous form during the heat treatment process, resulting in a large number of porous structures on the thermally stable PDMS polymer.

[0043] S3. Add the product obtained in step S2 to a 5-10% hydrogen peroxide solution at 40-50℃ and soak for 10 minutes. Remove the product to obtain the medium unit material, and then prepare it into medium units (such as rolls, wires, etc.) according to actual size requirements. After the microporous structure of the PDMS surface is formed in step S2, it needs to be further modified with functional groups. Since the adsorption properties of porous PDMS are mainly affected by oxygen-containing functional groups (-OH, -COOH, -C=O, etc.), the functional group modification method can change the chemical properties of the porous carbon surface and improve the adsorption performance of anti-fingerprint liquid.

[0044] In a preferred embodiment, the media unit 3 is subjected to an immersion treatment to allow it to absorb the anti-fingerprint coating liquid. This immersion treatment involves soaking the media unit 3 in an anti-fingerprint coating liquid with a mass fraction of 0.5-3% for 10-30 minutes, followed by drying at 70-90°C. The anti-fingerprint coating liquid comprises perfluoropolyether and perfluorocyclic ether, wherein the mass fraction of perfluoropolyether is 1-4%.

[0045] The above is the general concept of the present invention. Detailed embodiments are provided below to further illustrate the present invention.

[0046] Example 1

[0047] In the continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating provided in this embodiment, the material of the medium unit 3 is prepared by the following method:

[0048] S1. The polydimethylsiloxane (PDMS) prepolymer was magnetically stirred for 2 hours at 30°C and 45% RH. The polydimethylsiloxane (PDMS) prepolymer was Dow Corning SYLDGARD 184, which consisted of a main agent and a curing agent, mixed at a mass ratio of 10:1.

[0049] The main components of the main agent include methyl vinylcyclosiloxane (64-66 wt%), dimethyl vinyl silica and trimethyl silica (32-33 wt%), and ethylbenzene (0.19-0.2 wt%); the main components of the curing agent include dimethyl-methylhydrogen (siloxane and polysiloxane) (55%-65 wt%), hydrogen-terminated dimethyl (siloxane and polysiloxane) (22%-27 wt%), dimethyl vinyl silica and trimethyl silica (11%-14 wt%), and methyl vinylcyclosiloxane (1%-3 wt%).

[0050] S2. The product from step S1 is mixed with an organic pore-forming agent, vacuum degassed, heated to 100°C, and then heated to 150°C at a rate of 10°C / min, held at that temperature for 30 min, and then injection molded. The organic pore-forming agent is polyethylene glycol.

[0051] S3. Add the product obtained in step S2 to a 7% hydrogen peroxide solution at 45°C, soak for 10 minutes, and then remove it to obtain the material used in medium unit 3.

[0052] Reference Figure 2 The images show the microstructure and partial scanning electron microscope (SEM) images of the media unit material prepared in Example 1. The images reveal that the PDMS surface is relatively smooth and exhibits a non-uniform porous structure, which consists of channels left after the decomposition of the pore-forming agent. The partial SEM images clearly show that the PDMS material has a honeycomb-like void structure composed of micropores of varying diameters. This structure helps increase the specific surface area of ​​the material and improve its adsorption capacity. The microstructure will serve as an organic medium for loading anti-fingerprint liquid.

[0053] Reference Figure 3 The figure shows the stress-strain curve of the medium unit material prepared in Example 1. It can be seen from the figure that the curve of the modified porous PDMS after being repeatedly compressed 100 times under a pressure of 40% deformation is basically the same as the curve of its initial state. This shows that the PDMS elastic rope has good elasticity and no deformation, and further proves the reusability of the modified porous PDMS elastic rope.

[0054] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details.

Claims

1. A continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating, characterized in that, include: The unit includes a feeding unit, a medium unit, an evaporation unit, and a receiving unit. The medium unit, which contains anti-fingerprint coating liquid, is wound between the feeding unit and the receiving unit. The feeding unit and the receiving unit continuously supply the medium unit to the evaporation unit, so that the anti-fingerprint coating liquid inside the medium unit is heated and vaporized onto the target film. The media unit is prepared by the following method: S1. Stir the polydimethylsiloxane prepolymer magnetically for 1-3 hours at 30°C and 45%RH. The polydimethylsiloxane prepolymer comprises a main agent and a curing agent in a mass ratio of 10:

1. The main agent comprises 64-66 wt% methyl vinylcyclosiloxane, 32-33 wt% dimethylvinyl silica and / or trimethyl silica, and 0.19-0.2 wt% ethylbenzene. The curing agent comprises 55%-65 wt% dimethyl-methylhydrogen (siloxane and polysiloxane), 22%-27 wt% hydrogen-terminated dimethyl (siloxane and polysiloxane), 11%-14 wt% dimethylvinyl silica and / or trimethyl silica, and 1%-3 wt% methyl vinylcyclosiloxane. S2. Mix the product from step S1 with an organic pore-forming agent, degas under vacuum, heat to 100°C, then raise the temperature to 150°C at a rate of 10°C / min, hold for 30 minutes, and then injection mold. S3. Add the product obtained in step S2 to a hydrogen peroxide solution with a mass fraction of 5-10% at 40-50 °C, soak for 10 min, remove, and obtain the medium unit material.

2. The continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating according to claim 1, characterized in that, The organic pore-forming agent is one or more of polyethylene glycol, polyvinyl alcohol, and polyvinyl butyral.

3. The continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating according to claim 1, characterized in that, The evaporation unit provides a deposition temperature of 100-250°C and 10 -3 Vacuum degree of vapor deposition in Pa; The feeding speed of the feeding unit is controlled at 0.1-1 m / min; the receiving speed of the receiving unit is controlled at 0.1-1 m / min.

4. The continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating according to claim 1, characterized in that, The medium unit is subjected to an immersion treatment to allow it to absorb the anti-fingerprint coating liquid. The immersion treatment method is as follows: the medium unit is immersed in an anti-fingerprint coating liquid with a mass fraction of 0.5-3% for 10-30 minutes, and then dried at 70-90 ℃.

5. The continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating according to claim 4, characterized in that, The anti-fingerprint coating liquid includes perfluoropolyether and perfluorocyclic ether, wherein the mass fraction of perfluoropolyether is 1-4%.

6. The continuous supply and deposition system for anti-fingerprint film raw materials for roll-to-roll vacuum coating according to claim 1, characterized in that, It also includes a tension control unit located between the feeding unit and the receiving unit.

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