Functional film preparation process and device for realizing metal texture based on film coating silver paste

Abstract

The invention discloses a functional film preparation process for realizing metal texture based on film coating silver paste, which comprises the following steps: S1, selecting a proper film substrate material which can be a high polymer material such as polyethylene glycol terephthalate (PET), polycarbonate (PC) or polypropylene (PP); cleaning the film substrate to remove impurities such as oil stains and dust on the surface; the invention further discloses a functional film preparation device for achieving the metal texture based on the film coating silver paste, the functional film preparation device comprises a base, and a supporting plate is fixedly installed on the bottom wall of the base through a plurality of supporting legs. By reasonably selecting the particle size of the silver powder and optimizing the silver paste formula and the coating process, the prepared thin film has uniform, stable and high-glossiness metal texture and can meet the requirements of the fields of high-end decoration and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of thin film processing, and in particular to a functional thin film preparation process and device for realizing metallic texture based on thin film coating with silver paste. Background Art

[0002] A film is a thin, soft, transparent sheet, usually made of plastic, adhesive, rubber or other materials. Scientifically, a film is a two-dimensional material formed by the deposition of atoms, molecules or ions on the surface of a substrate. The thickness of the film ranges from a single atom to several millimeters. It is widely used in electronics, machinery, printing and other industries.

[0003] However, the existing silver paste coating process still needs to be improved in terms of film uniformity, stability of metallic texture and functional integration.

[0004] Moreover, coating the film with silver paste on its surface will form a conductive metallic coating. This coating not only has a metallic texture, but also has good conductivity and corrosion resistance. It is widely used in electronics, optics, decoration and other fields. After the film is coated with silver paste, it will be dried. In the prior art, most drying devices only dry one side of the film, and the other side is not fully dried, and it cannot be dried evenly, resulting in the silver paste falling everywhere during the winding process. The drying effect is poor and the practicality is insufficient. Therefore, it is necessary to redesign a functional film preparation process and device based on film coating with silver paste to achieve metallic texture in response to the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a functional film preparation process and device based on thin film coating with silver paste to achieve metallic texture.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A process for preparing a functional thin film with metallic texture based on thin film coating with silver paste comprises the following steps:

[0008] S1. Select a suitable film substrate material, wherein the film substrate material may be a polymer material such as polyethylene terephthalate (PET), polycarbonate (PC) or polypropylene (PP);

[0009] Clean the film substrate to remove impurities such as oil, dust, etc. on the surface;

[0010] Cleaning can be done by ultrasonic cleaning with organic solvents, and organic solvents such as ethanol and acetone can be used;

[0011] After cleaning, the film substrate is dried at a temperature of 50-80°C for 10-30 minutes.

[0012] S2. Silver paste is composed of silver powder, binder, solvent and additives. Silver powder is spherical or flake silver powder with a particle size of 0.1-5μm to ensure good conductivity and metallic luster of the silver paste;

[0013] The binder is a thermoplastic resin or a thermosetting resin, such as epoxy resin, acrylic resin, etc., and its mass accounts for 10%-30% of the total mass of the silver paste;

[0014] The solvent is an organic solvent that can dissolve the binder, such as toluene, xylene, etc. The mass of the solvent accounts for 40%-70% of the total mass of the silver paste;

[0015] The additives include dispersants, leveling agents, etc. The dispersants may be polymer dispersants, and the leveling agents may be silicone leveling agents. The total mass of the additives accounts for 1%-5% of the total mass of the silver paste.

[0016] The above ingredients are mixed uniformly in a high-speed disperser according to the proportion, the dispersion speed is 1000-3000rpm, and the dispersion time is 30-60 minutes;

[0017] S3, coating the prepared silver paste on the pre-treated film substrate by blade coating, micro-gravure coating or slit coating. During the coating process, the coating speed is controlled to be 5-20m / min, and the coating thickness is controlled to be 1-10μm according to the required metal texture and functional requirements;

[0018] For blade coating, the angle between the blade and the film substrate is controlled at 30-60 degrees; for micro-gravure coating, the cell depth of the micro-gravure roller is 10-50μm, and the cell density is 50-200 / cm 2 ; For slit coating, the slit width is 0.1-1mm;

[0019] S4, the coated film enters the drying oven for drying, and the drying temperature is controlled in stages;

[0020] First, dry at 60-80℃ for 5-10 minutes to evaporate the solvent, then dry at 100-150℃ for 10-20 minutes to cure the adhesive.

[0021] For thermosetting resin adhesives, post-curing treatment is also required. The post-curing temperature is 150-200°C and the curing time is 20-30 minutes to ensure that the adhesive is fully cured and improve the adhesion and stability of the film.

[0022] S5. The dried and cured film may be post-processed as needed. For example, the surface may be polished to further improve the uniformity and glossiness of the metal texture. The polishing may be performed using sandpaper or a polishing wheel with a grit of 800-2000.

[0023] The surface can also be coated with functional coatings, such as anti-scratch coatings, anti-fingerprint coatings, etc.

[0024] The functional coating can be applied by spraying, dipping, etc., with a coating thickness of 0.1-1 μm.

[0025] The present invention also discloses a functional film preparation device for realizing metallic texture based on film coating with silver paste, comprising a base, a support plate fixedly installed on the bottom wall of the base through a plurality of support legs, a hot air blower fixedly installed on the bottom wall of the base, a blowing hood fixedly installed on the outer wall of an air outlet pipe of the hot air blower, a protective net fixedly installed on the inner wall of the blowing hood, a connecting frame fixedly installed on the upper end surface of the base through a support frame, a drying box fixedly installed on the inner wall of the connecting frame through a lifting mechanism, a limiting plate fixedly installed on the upper end surface of the drying box through a stabilizing mechanism, a limiting roller rotatably installed on the upper end surface of the base through two fixed plates, a screw rotatably installed on the inner wall of the support frame through a moving frame, a motor connected to the screw fixedly installed on the outer bottom wall of the moving frame, a moving sleeve threadedly installed on the outer wall of the screw through a limiting mechanism, a mounting plate fixedly installed on the outer wall of the moving sleeve through a connecting mechanism, a fixed frame fixedly installed on the inner wall of the mounting plate through a buffer mechanism, a lower pressing roller rotatably installed on the inner wall of the fixed frame, and a winding device rotatably installed on the upper end surface of the base through two connecting plates.

[0026] Preferably, the lifting mechanism comprises a cylinder fixedly mounted on the inner wall of the connecting frame, the upper end surface of the support frame is provided with a telescopic opening cooperating with the cylinder, and the telescopic end of the cylinder is fixedly connected to the upper end surface of the drying box.

[0027] Preferably, the stabilizing mechanism comprises two stabilizing rods fixedly mounted on the upper end surface of the drying box, and the two stabilizing rods slide through the supporting frame.

[0028] Preferably, the limiting mechanism comprises a limiting rod fixedly mounted on the inner wall of the moving frame, and the limiting rod slides through the moving sleeve.

[0029] Preferably, the connecting mechanism comprises a connecting rod fixedly mounted on the outer wall of the moving sleeve, and an end of the connecting rod is fixedly connected to the outer wall of the mounting plate.

[0030] Preferably, the buffer mechanism comprises a damping spring telescopic rod fixedly mounted on the inner wall of the mounting plate, and the telescopic end of the damping spring telescopic rod is fixedly connected to the upper end surface of the fixing frame.

[0031] Beneficial effects of the present invention:

[0032] 1. By rationally selecting the silver powder particle size and optimizing the silver paste formula and coating process, the prepared film has a uniform, stable and high-gloss metallic texture, which can meet the needs of high-end decoration and other fields.

[0033] 2. The film prepared by this process can be added with multiple functions through post-processing, such as anti-scratch, anti-fingerprint and other functions, which expands its application range.

[0034] 3. Compared with the traditional metal texture acquisition process, this process has lower cost and is relatively simple and easy to mass produce.

[0035] 4. The organic solvents used in the preparation and coating of silver paste can be dried and recycled reasonably to reduce environmental pollution, which is more environmentally friendly than electroplating and other processes.

[0036] 5. By setting up components such as a hot air blower, an air outlet hood and a protective net, the hot air blower cooperates with the air hood to send hot air to the air outlet duct, and the air outlet duct blows the hot air out of the air hood, thereby drying the lower surface of the film, thereby preventing the silver paste on the surface of the film from falling off due to inadequate drying, affecting the subsequent winding work, and thus achieving uniform drying of the entire surface of the film. The protective net can partially intercept the blown hot air to prevent the film from being blown off due to excessive wind force.

[0037] 6. By setting components such as a screw rod, a limit rod and a damping spring telescopic rod, the moving distance of the lower pressure roller can be adjusted by cooperating with the limit rod when the screw rod rotates, thereby realizing the downward pressure and tightening of different films. The damping spring telescopic rod can prevent the film from being damaged due to excessive tension when the film is pressed, and plays a buffering role, so as to facilitate better film winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic structural diagram of a functional thin film preparation device for achieving metallic texture based on thin film coating with silver paste proposed by the present invention;

[0039] Figure 2 This is a right-side structural schematic diagram of a functional thin film preparation device for achieving metallic texture based on thin film coating with silver paste proposed by the present invention;

[0040] Figure 3 for Figure 1 Schematic diagram of the vertical section structure;

[0041] Figure 4 This is a schematic diagram of a top cross-sectional structure of a functional thin film preparation device for achieving metallic texture based on thin film coating with silver paste proposed by the present invention;

[0042] Figure 5 for Figure 1 A schematic diagram of the structure enlargement at point A;

[0043] Figure 6 for Figure 2 A schematic diagram of the structure at B in FIG.

[0044] Figure 7 for Figure 3 Schematic diagram of the enlarged structure at position C in FIG.

[0045] In the figure: 1 base, 2 supporting legs, 3 supporting plates, 4 hot air blower, 5 blowing hood, 6 protective net, 7 supporting frame, 8 connecting frame, 9 cylinder, 10 drying box, 11 stabilizing rod, 12 limiting plate, 13 fixed plate, 14 limiting roller, 15 moving frame, 16 screw, 17 motor, 18 limiting rod, 19 moving sleeve, 20 connecting rod, 21 mounting plate, 22 damping spring telescopic rod, 23 fixed frame, 24 lower pressure roller, 25 connecting plate, 26 winding equipment. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0047] A process for preparing a functional thin film with metallic texture based on thin film coating with silver paste comprises the following steps:

[0048] S1. Select a suitable film substrate material, wherein the film substrate material may be a polymer material such as polyethylene terephthalate (PET), polycarbonate (PC) or polypropylene (PP);

[0049] Clean the film substrate to remove impurities such as oil, dust, etc. on the surface;

[0050] Cleaning can be done by ultrasonic cleaning with organic solvents, and organic solvents such as ethanol and acetone can be used;

[0051] After cleaning, the film substrate is dried at a temperature of 50-80°C for 10-30 minutes.

[0052] S2. Silver paste is composed of silver powder, binder, solvent and additives. Silver powder is spherical or flake silver powder with a particle size of 0.1-5μm to ensure good conductivity and metallic luster of the silver paste;

[0053] The binder is a thermoplastic resin or a thermosetting resin, such as epoxy resin, acrylic resin, etc., and its mass accounts for 10%-30% of the total mass of the silver paste;

[0054] The solvent is an organic solvent that can dissolve the binder, such as toluene, xylene, etc. The mass of the solvent accounts for 40%-70% of the total mass of the silver paste;

[0055] The additives include dispersants, leveling agents, etc. The dispersants may be polymer dispersants, and the leveling agents may be silicone leveling agents. The total mass of the additives accounts for 1%-5% of the total mass of the silver paste.

[0056] The above ingredients are mixed uniformly in a high-speed disperser according to the proportion, the dispersion speed is 1000-3000rpm, and the dispersion time is 30-60 minutes;

[0057] S3, coating the prepared silver paste on the pre-treated film substrate by blade coating, micro-gravure coating or slit coating. During the coating process, the coating speed is controlled to be 5-20m / min, and the coating thickness is controlled to be 1-10μm according to the required metal texture and functional requirements;

[0058] For blade coating, the angle between the blade and the film substrate is controlled at 30-60 degrees; for micro-gravure coating, the cell depth of the micro-gravure roller is 10-50μm, and the cell density is 50-200 / cm 2 ; For slit coating, the slit width is 0.1-1mm;

[0059] S4, the coated film enters the drying oven for drying, and the drying temperature is controlled in stages;

[0060] First, dry at 60-80℃ for 5-10 minutes to evaporate the solvent, then dry at 100-150℃ for 10-20 minutes to cure the adhesive.

[0061] For thermosetting resin adhesives, post-curing treatment is also required. The post-curing temperature is 150-200°C and the curing time is 20-30 minutes to ensure that the adhesive is fully cured and improve the adhesion and stability of the film.

[0062] S5. The dried and cured film may be post-processed as needed. For example, the surface may be polished to further improve the uniformity and glossiness of the metal texture. The polishing may be performed using sandpaper or a polishing wheel with a grit of 800-2000.

[0063] The surface can also be coated with functional coatings, such as anti-scratch coatings, anti-fingerprint coatings, etc.

[0064] The functional coating can be applied by spraying, dipping, etc., with a coating thickness of 0.1-1 μm.

[0065] Reference Figure 1-7A functional film preparation device for realizing metallic texture based on film coating with silver paste comprises a base 1, a support plate 3 is fixedly installed on the bottom wall of the base 1 through a plurality of support legs 2, a hot air blower 4 is fixedly installed on the bottom wall of the base 1, a blowing hood 5 is fixedly installed on the outer wall of the air outlet duct of the hot air blower 4, a protective net 6 is fixedly installed on the inner wall of the blowing hood 5, a connecting frame 8 is fixedly installed on the upper end surface of the base 1 through a supporting frame 7, a drying box 10 is fixedly installed on the inner wall of the connecting frame 8 through a lifting mechanism, the lifting mechanism comprises a cylinder 9 fixedly installed on the inner wall of the connecting frame 8, a telescopic opening cooperating with the cylinder 9 is opened on the upper end surface of the supporting frame 7, the telescopic end of the cylinder 9 is fixedly connected to the upper end surface of the drying box 10, a limiting plate 12 is fixedly installed on the upper end surface of the drying box 10 through a stabilizing mechanism, the stabilizing mechanism comprises two stabilizing rods 11 fixedly installed on the upper end surface of the drying box 10, the two stabilizing rods 11 slide through the supporting frame 7, and a limiting roller 14 is rotatably installed on the upper end surface of the base 1 through two fixing plates 13.

[0066] The inner wall of the support frame 7 is rotatably mounted with a screw 16 through the moving frame 15, and a motor 17 connected to the screw 16 is fixedly mounted on the outer bottom wall of the moving frame 15. A moving sleeve 19 is threadedly mounted on the outer wall of the screw 16 through a limiting mechanism. The limiting mechanism includes a limiting rod 18 fixedly mounted on the inner wall of the moving frame 15, and the limiting rod 18 slides through the moving sleeve 19. The limiting rod 18 can limit the moving sleeve 19 so that the moving sleeve 19 can only move axially along the outer wall of the screw 16. The outer wall of the moving sleeve 19 is fixedly mounted with a mounting plate 21 through a connecting mechanism. The connecting mechanism includes a connecting rod 20 fixedly mounted on the outer wall of the moving sleeve 19, and the end of the connecting rod 20 is fixedly connected to the outer wall of the mounting plate 21 A fixed frame 23 is fixedly installed on the inner wall of the mounting plate 21 through a buffer mechanism. The buffer mechanism includes a damping spring telescopic rod 22 fixedly installed on the inner wall of the mounting plate 21. The damping spring telescopic rod 22 is a telescopic device that combines damping technology and spring structure. It is mainly used to reduce vibration and impact and provide a smooth telescopic effect. When the spring vibrates, it will consume energy due to friction and external resistance, thereby reducing the vibration amplitude and reducing the impact on the system and the environment. The telescopic end of the damping spring telescopic rod 22 is fixedly connected to the upper end surface of the fixed frame 23. A lower pressure roller 24 is rotatably installed on the inner wall of the fixed frame 23, and a winding device 26 is rotatably installed on the upper end surface of the base 1 through two connecting plates 25.

[0067] When the present invention is used, the end of the coated film is first dried, and then the dried part is wound around the outer wall of the winding device 26. When the film is dried, the cooperation of the multiple supporting legs 2 and the supporting plate 3 can keep the drying process stable. The film is placed between the drying box 10 and the blowing hood 5. The drying box 10 can be moved under the telescopic action of the cylinder 9, so that the drying box 10 can be moved to the upper surface of the film to heat and dry it. Since the drying box 10 is movable, the distance thereof can be adjusted according to the dry state of the film surface, so that the film maintains its quality during the drying process. The hot air blower 4 delivers hot air to the air outlet pipe by cooperating with the blowing hood 5, and the air outlet pipe blows the hot air out of the blowing hood 5, so that the lower surface of the film can be dried, thereby avoiding the silver paste on the surface of the film from falling off due to inadequate drying, which affects the subsequent winding work. The protective net 6 can partially intercept the blown hot air to avoid the film being blown off by excessive wind force.

[0068] When it is necessary to collect the dried film, the dried film can be always on the same horizontal line with the cooperation of the limiting roller 14, and then the motor 17 can drive the screw 16 to rotate. When the screw 16 rotates, it can drive the movable sleeve 19 to move by cooperating with the limiting rod 18. When the movable sleeve 19 moves, it can drive the damping spring telescopic rod 22 to move by cooperating with the connecting rod 20 and the mounting plate 21. When the damping spring telescopic rod 22 moves, it can drive the lower pressing roller 24 inside the fixed frame 23 to move. When the lower pressing roller 24 contacts the surface of the film, the film can be pressed to make the film in a tight state. When the screw 16 rotates, the distance of the lower pressing roller 24 can be adjusted, thereby realizing the downward pressing and tightening of films of different thicknesses. When the film is pressed, the damping spring telescopic rod 22 can prevent the film from being damaged due to excessive tension, and plays a buffering role, so that the winding device 26 can better wind the film. Finally, with the cooperation of multiple components, the film can be made more uniform and sufficient during the drying process, thereby improving the drying effect and drying efficiency of the film and improving the overall quality of the film.

[0069] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A process for preparing a functional thin film with metallic texture based on thin film coating with silver paste, characterized in that: The following steps are involved: S1. Select a suitable film substrate material, wherein the film substrate material may be a polymer material such as polyethylene terephthalate, polycarbonate or polypropylene; Clean the film substrate to remove impurities such as oil, dust, etc. on the surface; Cleaning can be done by ultrasonic cleaning with organic solvents, and the organic solvents may be ethanol, acetone, etc. After cleaning, the film substrate is dried at a temperature of 50-80°C for 10-30 minutes. S2. Silver paste is composed of silver powder, binder, solvent and additives. Silver powder is spherical or flake silver powder with a particle size of 0.1-5μm to ensure good conductivity and metallic luster of the silver paste; The binder is a thermoplastic resin or a thermosetting resin, such as epoxy resin, acrylic resin, etc., and its mass accounts for 10%-30% of the total mass of the silver paste; The solvent is an organic solvent that can dissolve the binder, such as toluene, xylene, etc. The mass of the solvent accounts for 40%-70% of the total mass of the silver paste; The additives include dispersants, leveling agents, etc. The dispersants may be polymer dispersants, and the leveling agents may be silicone leveling agents. The total mass of the additives accounts for 1%-5% of the total mass of the silver paste. Mix the above ingredients in a high-speed disperser according to the proportion, the dispersion speed is 1000-3000rpm, and the dispersion time is 30-60 minutes; S3, coating the prepared silver paste on the pretreated film substrate by blade coating, micro-gravure coating or slit coating; During the coating process, the coating speed is controlled at 5-20m / min, and the coating thickness is controlled at 1-10μm according to the required metal texture and functional requirements; For blade coating, the angle between the blade and the film substrate is controlled at 30-60 degrees; For micro-gravure coating, the cell depth of the micro-gravure roller is 10-50 μm, and the cell density is 50-200 cells / cm 2 ; For slot coating, the width of the slot is 0.1-1 mm; S4, the coated film enters the drying oven for drying, and the drying temperature is controlled in stages; First, dry at 60-80℃ for 5-10 minutes to evaporate the solvent, then dry at 100-150℃ for 10-20 minutes to cure the adhesive. For thermosetting resin adhesives, post-curing treatment is also required. The post-curing temperature is 150-200°C and the curing time is 20-30 minutes to ensure that the adhesive is fully cured and improve the adhesion and stability of the film. S5. The dried and cured film can be post-processed as needed; The surface can also be coated with functional coatings, such as anti-scratch coatings and anti-fingerprint coatings; The functional coating can be applied by spraying, dipping, etc., with a coating thickness of 0.1-1 μm.

2. A method for preparing a functional thin film with metallic texture based on thin film coating with silver paste, comprising a base (1), characterized in that: The bottom wall of the base (1) is fixedly mounted with a support plate (3) via a plurality of support legs (2); a hot air blower (4) is fixedly mounted on the bottom wall of the base (1); a blow hood (5) is fixedly mounted on the outer wall of an air outlet pipe of the hot air blower (4); a protective net (6) is fixedly mounted on the inner wall of the blow hood (5); a connecting frame (8) is fixedly mounted on the upper end surface of the base (1) via a support frame (7); a drying box (10) is fixedly mounted on the inner wall of the connecting frame (8) via a lifting mechanism; a limit plate (12) is fixedly mounted on the upper end surface of the drying box (10) via a stabilizing mechanism; and a limit roller is rotatably mounted on the upper end surface of the base (1) via two fixed plates (13). (14), a screw rod (16) is rotatably mounted on the inner wall of the support frame (7) through a movable frame (15), a motor (17) connected to the screw rod (16) is fixedly mounted on the outer bottom wall of the movable frame (15), a movable sleeve (19) is threadedly mounted on the outer wall of the screw rod (16) through a limiting mechanism, a mounting plate (21) is fixedly mounted on the outer wall of the movable sleeve (19) through a connecting mechanism, a fixed frame (23) is fixedly mounted on the inner wall of the mounting plate (21) through a buffer mechanism, a lower pressure roller (24) is rotatably mounted on the inner wall of the fixed frame (23), and a winding device (26) is rotatably mounted on the upper end surface of the base (1) through two connecting plates (25).

3. The functional thin film preparation device for realizing metallic texture based on thin film coating silver paste according to claim 2, characterized in that: The lifting mechanism comprises a cylinder (9) fixedly mounted on the inner wall of the connecting frame (8); the upper end surface of the supporting frame (7) is provided with a telescopic opening cooperating with the cylinder (9); the telescopic end of the cylinder (9) is fixedly connected to the upper end surface of the drying box (10).

4. The functional thin film preparation device for realizing metallic texture based on thin film coating silver paste according to claim 3, characterized in that: The stabilizing mechanism comprises two stabilizing rods (11) fixedly mounted on the upper end surface of the drying box (10), and the two stabilizing rods (11) slide through the supporting frame (7).

5. The functional thin film preparation device for realizing metallic texture based on thin film coating silver paste according to claim 4, characterized in that: The limiting mechanism comprises a limiting rod (18) fixedly mounted on the inner wall of the moving frame (15), and the limiting rod (18) slides through the moving sleeve (19).

6. The functional thin film preparation device for realizing metallic texture based on thin film coating silver paste according to claim 5, characterized in that: The connection mechanism comprises a connection rod (20) fixedly mounted on the outer wall of the moving sleeve (19), and the end of the connection rod (20) is fixedly connected to the outer wall of the mounting plate (21).

7. The functional thin film preparation device for realizing metallic texture based on thin film coating silver paste according to claim 6, characterized in that: The buffer mechanism comprises a damping spring telescopic rod (22) fixedly mounted on the inner wall of the mounting plate (21), and the telescopic end of the damping spring telescopic rod (22) is fixedly connected to the upper end surface of the fixing frame (23).

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