Transparent heating film, preparation process and application

Abstract

The invention provides a transparent heating film, which comprises a transparent base layer, a first electrode layer, a second electrode layer and a protective layer, and is characterized in that the transparent base layer has conductivity; the two first electrode layers are arranged on the transparent base layer; the second electrode layer is arranged on the first electrode layer; the protective layer completely covers the second electrode layer or the second electrode layer and the first electrode layer; the invention further provides a preparation process and application of the transparent heating film. The transparent heating film can be directly attached to a needed position, glass is prevented from fogging through heat generated by the heating film, more uniform heating of the transparent base layer can be achieved through cooperation of the second electrode layer and the first electrode layer, the second electrode layer or the first electrode layer can be better protected through the protection layer, and the transparent heating film is more uniform in heating. The service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of heating films, and in particular to a transparent heating film, a preparation process and applications. Background Art

[0002] Due to the temperature difference between inside and outside, the glass is prone to fogging up, which can easily block the line of sight. This is especially harmful when moving. For example, the front windshield of a car, once fogged up, will affect driving.

[0003] For non-mobile devices (such as display cabinets, glass windows at home or in factories, etc.), most of them are not treated at present. However, fogging will not only block light and vision, but also form water droplets, and there will be water stains on the glass for a long time. For mobile devices (such as cars), most of them use hot air to blow onto the front windshield to defog under the action of wind heat, but this method has the defect of high energy consumption.

[0004] In view of this, the inventor specially designed a transparent heating film, a preparation process and an application, and this case was thus generated. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a transparent heating film that can be directly attached to transparent glass or mirrors, and the heat generated by the heating film is used to prevent the glass from fogging, thereby overcoming the disadvantages caused by the current glass fogging.

[0006] The second purpose of the present invention is to propose a preparation process of a transparent heating film.

[0007] The third purpose of the present invention is to propose an application of a transparent heating film.

[0008] According to the present invention, a transparent heating film is provided, the transparent heating film comprising: A transparent base layer, wherein the transparent base layer is conductive and has a first area disposed near edges on both sides; A first electrode layer, wherein the first electrode layer has two and is respectively disposed in two first regions; a second electrode layer, wherein the second electrode layer is disposed on the first electrode layer; A protective layer, wherein the protective layer completely covers the second electrode layer or the second electrode layer and the first electrode layer.

[0009] The transparent heating film of the present invention can be directly attached to transparent glass or mirrors, and the heat generated by the heating film can be used to prevent the glass from fogging. The second electrode layer cooperates with the first electrode layer to achieve more uniform heating of the transparent base layer, and the protective layer can better protect the second electrode layer or the first electrode layer, thereby increasing the service life.

[0010] In some embodiments of the present invention, the two first regions are adjacent to any opposite edges of the transparent substrate.

[0011] In some embodiments of the present invention, an adhesive layer is disposed on the surface of the transparent base layer away from the first electrode layer, and the surface of the adhesive layer is covered with an easy-to-tear layer; or a protective film is disposed on the surface of the transparent base layer away from the first electrode layer.

[0012] In some embodiments of the present invention, two wires are further included, and the two wires are respectively connected to the second electrode layer; the transparent base layer adopts any one of an ITO film layer, a nanosilver film layer, a PEDOT film layer, and a CNT film layer, the first electrode layer adopts a silver paste layer, the second electrode layer adopts a copper foil layer, the protective layer adopts a silicone layer, and the protective layer is provided with avoidance holes for the wires to pass through.

[0013] In some embodiments of the present invention, the protective film and the shielding film may be made of PET layers.

[0014] A preparation process of a transparent heating film provided by the present invention comprises the following steps: Step 1, cutting a transparent base layer of a required size, wherein the transparent base layer is conductive, and the middle portion of the transparent base layer is a heating portion, and first areas are reserved on both sides of the heating portion; Step 2: disposing a first electrode layer in the first area of ​​the transparent base layer and close to the heating portion; Step 3, attaching a second electrode layer on the surface of the first electrode layer; Step 4: cutting the silicone, wherein the cut silicone at least completely covers the first area, and fixing it by vulcanization.

[0015] In some embodiments of the present invention, the step 1 further includes attaching a protective film on the heating part.

[0016] In some embodiments of the present invention, in step 4, the portion of the cut silicone not only completely covers the first area, but the remaining portion covers the protective film.

[0017] In some embodiments of the present invention, in step 2, silver paste is printed on the two first regions respectively and naturally solidified to form the first electrode layer. The printing of the silver paste does not necessarily need to completely cover the first regions, and can be printed according to actual needs.

[0018] In some embodiments of the present invention, the second electrode layer is made of copper foil, and the first electrode layer and the second electrode layer form a conductive electrode. Therefore, the conductive electrode is made to have better conduction performance, low loss, and long life by printing silver glue first and then covering it with copper foil tape. Large-size products can also have uniform heating and long life.

[0019] In some embodiments of the present invention, in step one, the size of the transparent base layer is: 18mm*18mm-850mm*2400mm; therefore, the size of the produced transparent heating film is: 18mm*18mm-850mm*2400mm.

[0020] In some embodiments of the present invention, the step 4 further includes a pre-processing step, which includes: Wiping the outer edge of the first area on the transparent substrate with alcohol; Applying a PET treatment agent to the edge of the protective film and the outer edge of the first area on the transparent substrate; The surface of the second electrode layer is coated with a metal treatment agent.

[0021] In some embodiments of the present invention, the method further includes step five of welding one end of the two wires to the two second electrode layers respectively.

[0022] In the step 4, when cutting the silicone, a hole is reserved for welding the wire, and the silicone is set on the transparent base layer by a vulcanizer.

[0023] According to an application of a transparent heating film provided by the present invention, the transparent heating film is applied to automobile windshields, rearview mirrors, lenses, and display windows for demisting and defrosting.

[0024] In some embodiments of the present invention, the transparent heating film has an operating temperature of 40°C-120°C, and a general operating range of 50°C-80°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] in: Figure 1 is a front view of the transparent heating film of the present invention; Figure 2 The present invention Figure 1 A partial enlarged view of Figure 3 is a cross-sectional view of the transparent heating film of the present invention Figure 1 ; Figure 4 The present invention Figure 3 A partial enlarged view of Figure 5 is a cross-sectional view of the transparent heating film of the present invention Figure 2 ; Figure 6 The present invention Figure 5 A partial enlarged view of Figure 7 is a cross-sectional view of the transparent heating film of the present invention Figure 3 ; Figure 8 This is a picture obtained by using only silver glue as an electrode in the experiment; Fig. 9 This is a picture obtained by testing the transparent heating film of the present invention.

[0027] Description of labels: 10. Transparent base layer; 20. First electrode layer; 30. Second electrode layer; 40. Protective layer; 41. Avoidance hole; 50. Wire; 51. Silicone sheet; 60. Protective film; 70. Protective film; 80. Adhesive layer; 90. Easy-tear layer. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] ITO film is a semiconductor material with high conductivity, high visible light transmittance, high mechanical hardness and good chemical stability. It is the most commonly used thin film material for transparent electrodes of liquid crystal displays (LCD), plasma displays (PDP), electroluminescent displays (EL / OLED), touch panels (TouchPanel), solar cells and other electronic instruments. Because ITO film has high conductivity and high visible light transmittance, it is used in the field of heating; a product transparent heating film is developed, and the current experiment is mainly aimed at the uniformity of product heating.

[0030] See also Figures 1 to 7, is a transparent heating film of the present invention, the transparent heating film comprises a transparent base layer 10, a first electrode layer 20, a second electrode layer 30, and a protective layer 40, the transparent base layer 10 is conductive, and a first area is arranged near the edges on both sides, which is not only conductive, but also transparent material can prevent light from being blocked; the first electrode layer 20 has two, and both are arranged on the transparent base layer 10, that is, the first electrode layer 20 has two parts, which are respectively connected to the positive and negative poles of the power supply device, and can be arranged side by side on the transparent base layer 10; the second electrode layer 30 is arranged on the first electrode layer 20; the protective layer 40 completely covers the second electrode layer 30 or the second electrode layer 30 and the first electrode layer 20, specifically, it is necessary to ensure that the protective layer 40 completely covers the surface of the second electrode layer 30 and the side wall parts of the second electrode layer 30 and the first electrode layer 20, so as to improve the service life of the heating film, the width of the second electrode layer 30 can be less than the width of the first electrode layer 20, or can be equal to the width of the first electrode layer 20, and it is more preferred that the width of the second electrode layer 30 is equal to the width of the first electrode layer 20. The transparent heating film of the present invention can be directly attached to the desired position (transparent glass or mirror), and the heat generated by the heating film can be used to prevent the glass from fogging. The second electrode layer 30 cooperates with the first electrode layer 20 to achieve more uniform heating of the transparent base layer 10, and the protective layer 40 can better protect the second electrode layer 30 or the first electrode layer 20, thereby increasing the service life.

[0031] The transparent base layer 10 has two first areas for setting the first electrode layer 20 on its surface on one side. The two first areas are close to any opposite edges of the transparent base layer. Taking the transparent base layer 10 as a rectangle as an example, the two first areas are arranged side by side and close to the edge of the long side or the short side of the transparent base layer 10; taking the transparent base layer 10 as a circle as an example, the two first areas are symmetrically arranged on the arc edge of the transparent base layer 10. Of course, the shape of the transparent base layer 10 can also be a polygon or a fan, etc., and it is selectively set according to actual needs.

[0032] The transparent base layer 10 adopts any one of an ITO film layer, a nano silver film layer, a PEDOT film layer, and a CNT film layer to make the transparent base layer 10 conductive; the two first electrode layers 20 completely cover the two first regions respectively, and adopt a silver paste layer, and the second electrode layer 30 adopts a copper foil layer, and when the first electrode layer 20 is cured and formed, it is directly bonded to the first electrode layer 20. The silver paste material is printed or coated on the two first regions to form the first electrode layer 20. The first electrode layer 20 and the second electrode layer 30 form a conductive electrode. The present invention uses a method of first printing silver paste and then covering the copper foil tape, so that the conductive electrode has better conductive performance, low loss, and high life. Large-size products can also have uniform heating and long life.

[0033] Please refer to Figure 1-3The transparent heating film of the present invention further comprises two wires 50, and the two wires 50 are respectively connected to the second electrode layer 30. The other ends of the two wires 50 can be connected by using a power supply device.

[0034] Please refer to Figure 2 The protective layer 40 is made of a silicone layer, and an avoidance hole 41 for the wire 50 to pass through is set on the protective layer 40. The protective layer 40 is hot-pressed by a vulcanizer. Before forming, the avoidance hole 41 is preset. After hot-pressing, one end of the wire 50 is directly welded to the second electrode layer 30.

[0035] Please refer to Figure 4 In the present invention, the transparent base layer 10 is located on one side of the protective layer 40 and a protective film 60 is arranged. The protective film 60 is located between the two protective layers 40 and is used to provide good protection for the surface of the transparent heating film. The protective film 60 can be a PET layer, and before the protective layer 40 is arranged, the protective film 60 is arranged first, which is beneficial to protect the transparent base layer and prevent the transparent base layer 10 from being affected when the electrode layer and the conductive layer are printed. Furthermore, the protective film 60 can achieve more uniform heating of the transparent base layer, and the protective film 60 can better protect the conductive coating on the transparent base layer of the heating part of the product, thereby improving the service life. When the protective layer 40 is arranged, the protective film 60 can be partially covered to prevent the protective film 60 from falling off and improving the service life.

[0036] Please refer to Figure 5-6 The surface of the transparent base layer 10 away from the first electrode layer 20 is provided with an adhesive layer 80, and the surface of the adhesive layer 80 is covered with an easy-tear layer 90. By removing the easy-tear layer 90, the transparent heating film can be easily attached to the desired position; for details, please refer to Figure 3-4 Another method is: a protective film 70 is set on the surface of the transparent base layer 10 away from the first electrode layer 20. When it is needed, the protective film 70 is torn off and then adhered to the required position with double-sided tape; the protective film 70 can be a PET layer.

[0037] The present invention also provides a process for preparing a transparent heating film, comprising the following steps: Step 1, cutting the transparent base layer 10 of the required size, the transparent base layer 10 is conductive, the middle part of the transparent base layer 10 is a heating part, and the first area is reserved on both sides of the heating part; Step 2: disposing a first electrode layer 20 in the first area of ​​the transparent base layer 10 and close to the heating part, wherein close to the heating part can be understood as the first electrode layer 20 being tightly attached to the edge of the heating part or having a gap between the first electrode layer 20 and the heating part; Step 3: attaching the second electrode layer 30 on the surface of the first electrode layer 20; Step 4: cutting the silicone, wherein the cut silicone at least completely covers the first area, and fixing it by vulcanization.

[0038] Step one also includes attaching a protective film 60 on the heating part. Before applying the PET protective film 60, the conductive surface will be completely exposed to the air during the printing of silver paste and the curing of the silver paste, which is easy to be scratched. The adhesion of dust will cause the conductive surface coating of the ITO film to be damaged, causing uneven heating of the product; the protective film 60 adopts a PET protective film 60 (adhesive film) and is applied by a film laminating machine; the required heating part is covered with the PET protective film 60, and the part of the silver paste electrode is printed in the first area reserved on both sides, so that the heating part used by the product can be fully protected, and the ITO film coating will not be damaged due to scratching or dust adhesion, so that the product heats evenly. In step one, the size of the transparent base layer 10 is: 18mm*18mm-850mm*2400mm; therefore, the specification of the transparent heating film produced is: 18mm*18mm-850mm*2400mm.

[0039] In step 2, silver paste is printed on the two first areas respectively, and naturally solidified to form the first electrode layer 20. The printing of the silver paste does not necessarily need to completely cover the first area, and can be printed according to actual needs. The second electrode layer 30 uses copper foil, and the first electrode layer 20 and the second electrode layer 30 form a conductive electrode. Therefore, the method of printing silver paste first and then covering with copper foil tape is used to make the conductive electrode have better conductive performance, low loss, and high life. Large-size products can also have uniform heating and long life.

[0040] In step 4, the cut silicone not only completely covers the first area, but the remaining part covers the protective film 60; the silicone is vulcanized and bonded to the transparent base layer 10 (i.e., any one of ITO film, nano silver film, PEDOT film, and CNT film) as the electrode protection layer 40. The silicone has the characteristics of thermal conductivity, insulation, soft material, and self-adhesive surface. The vulcanized silicone can fill the gaps, has better heat resistance, long service life, and can achieve better insulation effect. Before step 4, a pretreatment step is also included, which includes: The outer edge of the first area on the transparent substrate is wiped with alcohol; Applying a PET treatment agent to the edge of the protective film 60 and the outer edge of the first area on the transparent substrate; The surface of the second electrode layer 30 is coated with a metal treatment agent.

[0041] The preparation process of the present invention also includes step 5, welding one end of the two wires 50 to the two second electrode layers 30 respectively; in step 4, when cutting the silicone, a hole 41 is reserved for welding the wires 50, and the silicone is set on the transparent base layer 10 by a vulcanizer. The existing method of riveting the wires 50 is prone to poor contact and heating after long-term use; therefore, the wires 50 of the present invention are soldered, the connection is more solid, the conductivity is better, and the connection part does not heat up.

[0042] After the transparent heating film has welded the wire, it is necessary to heat-press a silicone sheet 51 of a size that can wrap the welding position or to apply RTV sealant at the position for curing, so as to protect the wire welding position and achieve the effect of sealing and insulation.

[0043] The invention provides an application of a transparent heating film, which is applied to automobile windshields, rearview mirrors, lenses, and display windows for defogging. The use temperature of the transparent heating film is 40℃-120℃, and the general use range is: 50℃-80℃.

[0044] Compared with using only copper foil or silver glue as electrodes, the transparent heating film of the present invention has better heating uniformity. Specifically: In the case of the same size, the measured pictures of the transparent heating film of the present invention refer to Fig. 9 , and using copper foil tape as electrodes alone, although the resistance is small, the current loss is small, and the whole piece can be heated evenly when making large products, but the life is short and it is easy to be damaged. Bubbles will appear in the electrode parts between the transparent heating film, and the copper foil will be wrinkled and burned. Please refer to Figure 8 If only silver glue is used as the electrode, its life is long, but its high resistance will cause current loss. If it is made into a large size, the electrode is too long and the whole piece cannot be heated evenly, which can easily cause the electrode to heat up.

[0045] To sum up, the transparent heating film of the present invention can be directly adhered to the desired position, and the heat generated by the heating film can be used to prevent the glass from fogging. The second electrode layer cooperates with the first electrode layer to achieve more uniform heating of the transparent base layer, and the protective layer can better protect the second electrode layer or the first electrode layer, thereby increasing the service life.

[0046] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A transparent heating film, characterized in that: The transparent heating film comprises: A transparent base layer, wherein the transparent base layer is conductive and has a first area disposed near edges on both sides; A first electrode layer, wherein the first electrode layer has two and is respectively disposed in two first regions; a second electrode layer, wherein the second electrode layer is disposed on the first electrode layer; A protective layer, wherein the protective layer completely covers the second electrode layer or the second electrode layer and the first electrode.

2. A transparent heating film according to claim 1, characterized in that: The two first regions are adjacent to any opposite edges of the transparent substrate.

3. A process for preparing a transparent heating film, used for preparing a transparent heating film as claimed in any one of claims 1 to 2, characterized in that: The following steps are involved: Step 1, cutting a transparent base layer of a required size, wherein the transparent base layer is conductive, and the middle portion of the transparent base layer is a heating portion, and first areas are reserved on both sides of the heating portion; Step 2: disposing a first electrode layer in the first area of ​​the transparent base layer and close to the heating portion; Step 3, attaching a second electrode layer on the surface of the first electrode layer; Step 4: cutting the silicone, wherein the cut silicone at least completely covers the first area, and fixing it by vulcanization.

4. The process for preparing a transparent heating film according to claim 3, characterized in that: The step 1 also includes attaching a protective film on the heating part.

5. The process for preparing a transparent heating film according to claim 4, characterized in that: In the step 4, the portion of the cut silicone not only completely covers the first area, but the remaining portion also covers the protective film.

6. The process for preparing a transparent heating film according to claim 1, characterized in that: In the step 2, silver paste is printed on the two first regions respectively and naturally solidified to form the first electrode layer.

7. The process for preparing a transparent heating film according to claim 1, characterized in that: In the step 1, the size of the transparent base layer is: 18mm*18mm-850mm*2400mm.

8. The process for preparing a transparent heating film according to claim 1, characterized in that: The step 4 also includes a pre-processing step, which includes: Wiping the outer edge of the first area on the transparent substrate with alcohol; Applying a PET treatment agent to the edge of the protective film and the outer edge of the first area on the transparent substrate; The surface of the second electrode layer is coated with a metal treatment agent.

9. The process for preparing a transparent heating film according to claim 1, characterized in that: The method further comprises step five of welding one end of the two wires to the two second electrode layers respectively.

10. An application of a transparent heating film, characterized in that: The transparent heating film is applied to the car windshield, rearview mirror, lens, display window for demisting and / or defrosting.

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