Membrane multi-coating coating equipment

Abstract

The utility model belongs to the technical field of surface coating, and relates to diaphragm multi-coating coating equipment which comprises a conveying device for unwinding, conveying and winding a diaphragm, and a gravure coating device, an atomization coating device and a drying device which are sequentially arranged along the conveying direction of the diaphragm, the gravure coating device is used for coating first coating liquid on the surface of the diaphragm, and the atomization coating device is used for coating second coating liquid on the surface of the diaphragm. And the atomization coating device covers the outer surface of the coating of the first coating liquid with second coating liquid. According to the equipment, the diaphragm can be coated with two layers of coating liquid in sequence, then overall drying is carried out, the two layers of coating liquid are prevented from being mixed when making contact through atomization coating, the uniformity of the thickness of the diaphragm can be improved, and performance exertion of the coating is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of surface coating, in particular to a diaphragm multi-coating coating device. Background Art

[0002] The production of aramid-coated separators typically involves a multi-layer coating process designed to enhance the separator's mechanical strength, thermal stability, and electrochemical performance. During this process, a coating liquid is uniformly applied to the substrate surface using specialized coating equipment, creating a multi-layer structure to achieve the desired functionality and safety.

[0003] Although existing technologies have made certain progress in the manufacture of aramid-coated diaphragms, there are still some problems that need to be solved urgently: in the multi-layer coating process, mixing may occur between different coating liquids, which will not only affect the uniformity of the coating, but may also reduce the performance of the final product; at the same time, the coating process requires extremely high control of environmental conditions (such as humidity and temperature), and existing technologies are difficult to achieve precise control, which may lead to unstable coating quality.

[0004] Chinese patent CN111545397A discloses a diaphragm coating device, comprising a first coating device, a second coating device, and a third coating device connected in sequence. This device can apply up to three different coatings on the diaphragm. The first coating device is a micro-gravure coating device or a wire rod coating device, the second coating device is an extrusion coating device, and the third coating device is a wire rod coating device. The coating devices here apply relatively viscous materials and the coating thickness is relatively large. If the coating is thin and the material is small, the coating device itself may cause the materials of different layers to mix, resulting in each coating layer failing to perform its respective functions well.

[0005] Therefore, it is necessary to improve the coating equipment to solve the above problems. Utility Model Content

[0006] The main purpose of the utility model is to provide a diaphragm multi-coating coating device, which can use different methods to coat two coating materials on the surface of the diaphragm, avoid mixing of the two coating materials, and ensure the quality of the coating.

[0007] The utility model achieves the above-mentioned purpose through the following technical solution: a diaphragm multi-coating coating device, including a conveying device for unwinding, conveying and rewinding the diaphragm, a gravure coating device, an atomizing coating device and a drying device arranged in sequence along the conveying direction of the diaphragm, the gravure coating device coating the first coating liquid on the surface of the diaphragm, and the atomizing coating device covering the outer surface of the coating of the first coating liquid with a second coating liquid.

[0008] Specifically, the conveying device includes a unwinding roller, several reversing rollers and a winding roller arranged in sequence, and the reversing rollers include at least a first roller located between the gravure coating device and the atomizing coating device and a second roller located between the drying device and the winding roller, and the highest point of the first roller is at the same height as the highest point of the second roller.

[0009] Furthermore, the conveying device also includes a tension roller for controlling the tension of the diaphragm during conveyance.

[0010] The beneficial effects of the technical solution of this utility model are:

[0011] This equipment can give the performance of the diaphragm coating material, among which the gravure printing control is simple. However, because the first coating liquid and the second coating liquid will coexist on the surface of the diaphragm before drying, in order to avoid mixing and scratching the two when they are not solidified, the second coating liquid needs to be applied to the coating of the first coating liquid by atomization spraying. Because at this time, the droplets of the second coating liquid adhere to the coating surface of the first coating liquid with very small force, it will not cause the violent flow of the first coating liquid, thereby protecting the integrity of the coating. After the second coating liquid fully covers the first coating liquid, the interface between the two will be clearer, thereby improving the uniformity of the film thickness and ensuring the performance of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a simplified piping diagram of the diaphragm multi-coating coating equipment of the embodiment.

[0013] The numbers in the figure represent:

[0014] 1-Diaphragm multi-coating coating equipment,

[0015] 11- conveying device, 111- unwinding roller, 112- reversing roller, 112a- first roller, 112b- second roller, 113- winding roller, 114- tension roller,

[0016] 12-Gravure coating device,

[0017] 13- Atomization coating device,

[0018] 14- drying device;

[0019] 2- Diaphragm. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to specific embodiments.

[0021] Example:

[0022] like Figure 1As shown, the utility model is a diaphragm multi-coating coating device, a diaphragm multi-coating coating device 1, including a conveying device 11 for unwinding, conveying and rewinding the diaphragm 2, a gravure coating device 12, an atomizing coating device 13 and a drying device 14 arranged in sequence along the conveying direction of the diaphragm 2, the gravure coating device 12 coats the first coating liquid on the surface of the diaphragm 2, and the atomizing coating device 13 covers the second coating liquid on the outer surface of the coating of the first coating liquid.

[0023] In this embodiment, the first coating liquid contains a filler that improves mechanical strength and thermal stability, such as titanium dioxide or silicon dioxide, while the second coating liquid contains a material that enhances chemical stability and heat resistance, such as a bio-based material or an organosilicon compound. By forming a double-layer coating, the corresponding properties are imparted to the separator 2. The first coating liquid cannot flow outside the second coating liquid, otherwise it will reduce chemical stability and heat resistance. The second coating liquid cannot flow into the first coating liquid, otherwise it will damage mechanical strength and thermal stability. The first and second coating liquids contain relatively high solvent content, and each only forms a thin layer of coating. After drying, the total thickness of the separator is very thin and relatively uniform. Gravure printing is simple to control, but because the first coating liquid and the second coating liquid will coexist on the surface of the diaphragm 2 before drying, it is necessary to avoid mixing and scratching the two when they are not solidified. Therefore, the second coating liquid needs to be applied to the coating of the first coating liquid by atomization spraying. Because at this time, the droplets of the second coating liquid adhere to the coating surface of the first coating liquid with very little force, it will not cause the violent flow of the first coating liquid, thus protecting the integrity of the coating. After the second coating liquid fully covers the first coating liquid, the interface between the two will be clearer. After drying by the drying device 13, a coating body with two coatings can be obtained, which improves the uniformity of the film thickness and ensures the performance of the coating.

[0024] like Figure 1 As shown, the conveying device 11 includes a unwinding roller 111, several reversing rollers 112 and a winding roller 113 arranged in sequence. The reversing roller 112 includes at least a first roller 112a located between the gravure coating device 12 and the atomizing coating device 13 and a second roller 113 located between the drying device 14 and the winding roller 113. The highest point of the first roller 112a is at the same height as the highest point of the second roller 112b.

[0025] The diaphragm 2 is a easily deformed strip of material, so it is typically stored rolled up. Therefore, unwinding and collecting the diaphragm 2 are performed using unwinding rollers 111 and winding rollers 113, and the direction of transport of the diaphragm 2 is controlled by reversing rollers 112 during transport. After the first coating liquid is applied to the surface of the diaphragm 2 and before the two coating liquids solidify, the coating surface must not be contacted by any equipment components, as this would damage the integrity of the coating and the clarity of the interface between the two coatings. Therefore, the first and second rollers 112a, 112b support the front and rear sides of the diaphragm 2, allowing it to remain suspended in a substantially horizontal position as it passes through the atomizing coating device 13 and drying device 14, ensuring the quality of the coating.

[0026] like Figure 1 As shown, the conveying device 11 further includes a tension roller 114 for controlling the tension of the diaphragm 2 during conveyance.

[0027] If the diaphragm 2 cannot remain taut when passing through the gravure coating device 12, the atomizing coating device 13 and the drying device 14, uneven film thickness may occur. Therefore, it is necessary to rely on the tension roller 114 to keep the diaphragm 2 flat, which also ensures the quality of the coating.

[0028] The working process of this equipment is as follows: the rolled diaphragm 2 is unwound from the unwinding roller 111, and the front part passes through the tension roller 114, the gravure coating device 12, the first roller 112a, the atomizing coating device 13, the drying device 14, the second roller 112b and the winding roller 113 in sequence, and the tension roller 114 is used to first tighten the diaphragm 2; the gravure coating device 12, the atomizing coating device 13 and the drying device 14 are preheated, and then the conveying device 11 is started, and the unrolled diaphragm 2 is coated with the first coating liquid by the gravure coating device 12 in sequence, and coated with the second coating liquid by the atomizing coating device 13, and the first coating liquid and the second coating liquid are solidified into two coatings with uniform thickness and clear boundaries by the drying device 14, and finally the coated body is collected again as a coil at the winding roller 113.

[0029] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A diaphragm multi-coating coating device, characterized in that: It includes a conveying device for unwinding, conveying and rewinding the diaphragm, a gravure coating device, an atomizing coating device and a drying device arranged in sequence along the conveying direction of the diaphragm, the gravure coating device coats the first coating liquid on the surface of the diaphragm, and the atomizing coating device covers the second coating liquid on the outer surface of the coating of the first coating liquid.

2. The diaphragm multi-coating coating device according to claim 1, characterized in that: The conveying device includes a unwinding roller, several reversing rollers and a winding roller arranged in sequence, and the reversing rollers include at least a first roller located between the gravure coating device and the atomizing coating device and a second roller located between the drying device and the winding roller. The highest point of the first roller is at the same height as the highest point of the second roller.

3. The diaphragm multi-coating coating device according to claim 2, characterized in that: The conveying device further comprises a tension roller for controlling the tension of the diaphragm during conveyance.

Images