Solvent type silicone oil release paper with high-breathability structure

Abstract

The utility model provides a solvent type silicone oil release paper with a highly breathable structure, which comprises a release layer, a laminating layer, a breathable layer, a base paper layer and a protective layer, a plurality of first air holes are arranged in the release layer and the laminating layer, a plurality of second air holes are arranged in the base paper layer, and the protective layer is arranged in the breathable layer. The breathable layer comprises a breathable fiber layer and waterproof breathable film layers arranged on the upper surface and the lower surface of the breathable fiber layer, a plurality of third air holes are formed in the breathable fiber layer, the breathable fiber layer is bent and folded between the waterproof breathable film layers in a corrugated mode, and transverse breathable grooves are defined by the breathable fiber layer and the waterproof breathable film layers. The breathable layer is matched with the first air holes and the second air holes, so that the overall breathability of the release paper can be further improved, the problem that existing release paper is not ideal in breathability is solved, and the problem that the existing release paper is prone to mildewing in the long-term contact process with water vapor is solved through the antibacterial coatings arranged on the upper side and the lower side of the paper layer.

Description

Technical Field

[0001] The utility model relates to the technical field of release paper manufacturing, in particular to a solvent-based silicone oil release paper with a high air permeability structure. Background Art

[0002] The structure of common release paper includes paper layer, coating layer and release layer. The release layer can prevent objects from sticking together, while the coating layer can prevent the silicone oil of the release layer from penetrating into the paper layer and preventing the silicone oil from soaking the paper. When making existing release paper, the coating material is generally sprayed on the surface of the paper layer to form a dense film layer on the surface of the paper layer, which leads to poor air permeability of the release paper. When using release paper with poor air permeability, the paper may stick to the contacted material due to the inability to effectively release moisture and gas, resulting in difficulty in peeling. This will not only affect production efficiency, but also may damage the paper and the contacted material. At the same time, due to the limited gas circulation, the gas in the composite material may not be fully released, which may cause bubbles and bulges in the product, affecting its appearance and performance.

[0003] Based on the above situation, in the prior art, the patent with publication number CN206512521U discloses a multi-layer breathable release paper, including a release paper base paper, the upper surface of the release paper base paper is sprayed with a release layer by spraying, wherein the release layer is sprayed to cover the surface of the release paper base paper, which is not only more uniform, but also does not block the airway of the release paper base paper by the release layer. The surface of the release layer is coated with a breathable film. The utility model uses natural wood fiber paper to make the traditional base paper, which has a porous characteristic as a whole and has better air permeability. At the same time, it is combined with the breathable film, so that the whole is not only breathable, but also the release paper itself The waterproof property of the release paper still exists, but there are still some shortcomings in the use of the release paper in the patent. First, the heat dissipation function is not ideal. Although the patent states that the release layer is covered on the surface of the paper layer by spraying, it will still affect the air permeability of the paper layer to a certain extent. At the same time, if the spraying points are too dense, the silicone oil will penetrate the paper layer, resulting in the strength and stiffness of the paper, which is easy to cause problems such as paper curling and wrinkling. Second, the waterproof and breathable release paper is often in contact with water vapor during use, causing the paper layer to be soaked. The release paper that is in contact with water vapor for a long time is prone to mold, causing the release paper to lose its use value. Utility Model Content

[0004] In view of the technical defects existing in the background technology, the utility model proposes a solvent-based silicone oil release paper with a highly breathable structure to solve the problem of unsatisfactory air permeability of the existing release paper and the problem of easy mold formation due to long-term contact with water vapor. In order to further solve the above technical problems and meet actual needs, the specific technical solutions are as follows:

[0005] A solvent-based silicone oil release paper with a highly breathable structure comprises a release layer, a coating layer, a breathable layer and a base paper layer, wherein the release layer, the coating layer, the breathable layer and the base paper layer are arranged in sequence from top to bottom along the thickness direction of the release paper, a protective layer is arranged on the lower surface of the base paper layer, a plurality of first air holes are arranged in the release layer and the coating layer, a plurality of second air holes are arranged in the base paper layer, the breathable layer comprises a breathable fiber layer and a waterproof breathable film layer arranged on the upper and lower surfaces of the breathable fiber layer, a plurality of third air holes are arranged in the breathable fiber layer, the breathable fiber layer is bent and folded in a corrugated shape between the waterproof breathable film layers, and is enclosed with the waterproof breathable film layer to form a transverse breathable groove.

[0006] Furthermore, the first pores longitudinally penetrate the release layer and the coating layer and are evenly distributed in the release layer and the coating layer, the second pores longitudinally penetrate the base paper layer and are evenly distributed in the base paper layer, and the first pores and the second pores are symmetrically distributed on both sides of the breathable layer.

[0007] Furthermore, the base paper layer includes an antibacterial coating and a paper layer sandwiched between the antibacterial coatings, and the antibacterial coating is a nano silver coating with a thickness of 20 μm-30 μm.

[0008] Furthermore, the release layer is a solvent-based silicone oil coating with a thickness of 40 μm-50 μm.

[0009] Furthermore, the coating layer is a polylactic acid film layer with a thickness of 20 μm-35 μm.

[0010] Furthermore, the breathable fiber layer is a bamboo fiber layer with a thickness of 40 μm-60 μm, and the waterproof breathable membrane layer is a TPU membrane layer with a thickness of 100 μm-150 μm.

[0011] Furthermore, the protective layer is a TPU film layer with a thickness of 100 μm-150 μm.

[0012] The beneficial effects of the utility model are:

[0013] The release paper of the utility model has the characteristics of high air permeability, antibacterial and biodegradability. The air permeable layer is composed of a breathable bamboo fiber layer and a waterproof breathable film layer, both of which are made of breathable materials, which can increase the air permeability of the release paper. The cooperation between the air permeable layer and the first air hole and the second air hole can further increase the overall air permeability of the release paper. The antibacterial coatings arranged on the upper and lower sides of the paper layer can prevent the release paper from getting moldy during long-term contact with water vapor. At the same time, the coating layer and the breathable fiber layer are both made of biodegradable materials, so that most of the release paper as a whole is biodegradable, thereby increasing the environmental friendliness of the release paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is a structural schematic diagram of the utility model.

[0016] Figure 3 For along Figure 2 Middle AA cross section.

[0017] Figure 4 Schematic diagram of the structure of release layer and coating layer.

[0018] Figure 5 Schematic diagram of the base paper layer structure.

[0019] Figure numerals: release layer 1, coating layer 2, breathable layer 3, waterproof breathable membrane layer 31, breathable fiber layer 32, third air hole 33, air groove 34, base paper layer 4, antibacterial coating 41, paper layer 42, protective layer 5, first air hole 6, second air hole 7. DETAILED DESCRIPTION

[0020] The implementation methods of the present invention are described below in conjunction with the accompanying drawings and relevant embodiments. The implementation methods of the present invention are not limited to the following embodiments, and the present invention involves relevant necessary components in this technical field, which should be regarded as common knowledge in this technical field and can be known and mastered by technical personnel in this technical field.

[0021] like Figures 1 to 5 As shown, the utility model provides a technical solution: a solvent-based silicone oil release paper with a highly breathable structure, comprising a release layer 1, a coating layer 2, a breathable layer 3 and a base paper layer 4, wherein the release layer 1, the coating layer 2, the breathable layer 3 and the base paper layer 4 are sequentially arranged from top to bottom along the thickness direction of the release paper, a protective layer 5 is provided on the lower surface of the base paper layer 4, a plurality of first air holes 6 are provided in the release layer 1 and the coating layer 2, a plurality of second air holes 7 are provided in the base paper layer 4, the breathable layer 3 comprises a breathable fiber layer 32 and a waterproof breathable film layer 31 arranged on the upper and lower surfaces of the breathable fiber layer 32, a plurality of third air holes 33 are provided in the breathable fiber layer 32, the breathable fiber layer 32 is bent and folded in a corrugated shape between the waterproof breathable film layer 31, and enclosed with the waterproof breathable film layer 31 to form a transverse breathable groove 34.

[0022] The waterproof breathable membrane layer 31 and the breathable fiber layer 32 constituting the breathable layer 3 are both made of breathable materials. The third air hole 33 is provided through the breathable fiber layer 32 which is bent and folded in a corrugated shape, so that the release paper has breathability. The first air hole 6 and the second air hole 7 are symmetrically arranged on the upper and lower sides of the breathable layer 3, so that the release paper has a porous property in structure, making the release paper more breathable. The antibacterial coating 41 in the base paper layer 4 can prevent the release paper from getting moldy when it is in a humid environment for a long time, thereby further increasing the service life of the release paper. The breathable fiber layer 32 and the waterproof breathable membrane layer 31 enclose a horizontal breathable groove 34 which cooperates with the first air hole 6 and the second air hole 7, which can further increase the breathability of the release paper, and at the same time can also prevent the formation of bubbles when the release paper is attached to the surface of an object, making the release paper more fit.

[0023] Conventional release paper has poor air permeability. When the release paper is attached to the surface of an object over a large area, a number of tiny bubbles will be formed between the release paper and the surface of the object. These bubbles will reduce the release strength of the release paper to a certain extent. The conventional way to remove these tiny bubbles is to use tools such as scrapers to drive these tiny bubbles out from between the release paper and the surface of the object. In the process of driving out the bubbles, if the force is too small, the bubbles cannot be completely driven out. If the force is too large, the release paper may be scratched and ruptured. Therefore, the release paper needs to have high air permeability in structure, and the gas in the tiny bubbles between the release paper and the surface of the object can be discharged through the air permeable structure.

[0024] In order to solve the problem of poor air permeability of conventional release paper, the release paper of the utility model makes corresponding changes in the material composition and structure of the release paper, and makes corresponding air permeability settings on the composition material of the release paper, so that the structure of the release paper also appears to be more reasonable. In order to allow gas to pass through the release paper without being blocked by the composition material, a breathable layer 3 is added between the base paper layer 4 and the coating layer 2 of the release paper, and the breathable layer 3 is also treated with air permeability in terms of material and structure. Similarly, the protective layer 5 is treated with air permeability in terms of material. The waterproof and breathable membrane layer 31 and the protective layer 5 are made of TPU film, and the breathable fiber layer 32 is made of bamboo fiber. Both the TPU film and the bamboo fiber are materials with high air permeability, so that the release paper has certain air permeability in terms of material composition. In order to further enhance the overall air permeability of the release paper, corresponding air permeability settings are made in the structure of the release paper, and holes for air supply are respectively opened on the surface of the release paper by micron-level laser punching technology. The gas passes through the first air holes 6 penetrating the coating layer 2 and the release layer 1 of the release paper, the second air holes 7 penetrating the base paper layer 4, and the third air holes 33 penetrating the breathable fiber layer 32. At the same time, the breathable fiber layer 32 is made into a wavy curved structure through a micron-level injection molding process, so that a breathable groove 34 for gas flow is formed between the waterproof breathable fiber layer 32 and the breathable film layer 31. The first air holes 6, the second air holes 7, the third air holes 33 and the breathable grooves 34 make the release paper breathable in structure, thereby further increasing the overall breathability of the release paper. The protective layer 5 is made of TPU film. On the one hand, it is to protect the antibacterial coating 41. On the other hand, it is to avoid the protective layer 5 covering the surface of the second air hole 7. The protective layer 5 blocks the second air hole 7. The gas can still escape outward through the second air hole 7, thereby ensuring the overall breathability of the release paper in structure. Through the combination of the above-mentioned breathable structure and breathable material, the high breathable structure of the release paper is more reasonable.

[0025] When bubbles exist between the release paper and the surface of an object in the present invention, the gas in the bubble first enters the release paper through the first air hole 6, and then passes through the waterproof breathable membrane layer 31 above the breathable fiber layer 32 to enter the breathable groove 34. A part of the gas moves along the groove body of the breathable groove 34 and escapes from both ends of the groove body of the breathable groove 34. The other part of the gas passes through the breathable groove 34 through the third air hole 33, and then passes through the waterproof breathable membrane layer 31 below the breathable fiber layer 32 to enter the second air hole 7 and escape outward through the second air hole 7, so that the bubbles between the release paper and the surface of the object are discharged, thereby further increasing the contact between the release paper and the surface of the object, increasing the release strength of the release paper, and being more fit when attached to the surface of the object.

[0026] When making the release paper, the bamboo fiber is crushed into nano bamboo fiber particle powder, and then the nano bamboo fiber particle powder is made into a breathable fiber layer 32 with a wavy curved structure by a micron-level injection molding process, and then the breathable fiber layer 32 is perforated by a micron-level laser, so that the third air hole 33 is formed in the breathable fiber layer 32, and then the TPU breathable film is adhered to the upper and lower surfaces of the breathable fiber layer 32 by viscose. When making the base paper layer 4, the silver ion coating can be directly coated on the upper and lower surfaces of the paper layer 42, and the breathable The air layer 3 and the base paper layer 4 are connected by adhesive adhesion and high-pressure pressing, and then a hot-melt polylactic acid material is sprayed on the upper surface of the air permeable layer 3 to form a coating layer 2. The upper surface of the coating layer 2 is coated with solvent-based silicone oil to form a release layer 1. The release paper is then laser-punched at the micron level to form first pores 6 that penetrate the release layer 1 and the coating layer 2 and second pores 7 that penetrate the base paper layer 4. Then, a layer of TPU breathable film is adhered to the lower surface of the base paper layer 4 by adhesive to form a protective layer 5.

[0027] As a preferred embodiment of the present invention, Figures 2 to 5 As shown, the first pores 6 longitudinally penetrate the release layer 1 and the coating layer 2 and are evenly distributed in the release layer 1 and the coating layer 2, the second pores 7 longitudinally penetrate the base paper layer 4 and are evenly distributed in the base paper layer 4, the first pores 6 and the second pores 7 are symmetrically distributed on both sides of the air-permeable layer 3, the first pores 6 and the second pores 7 are channels for gas exchange and escape between the release paper and the surface of the object, the first pores 6 and the second pores 7 make the release paper porous in structure, thereby further increasing the air permeability of the release paper, the first pores 6 and the second pores 7 cooperate with the air-permeable layer 3 in the structure, so that the whole is not only breathable, but also the waterproof property of the release paper itself still exists.

[0028] As another preferred embodiment of the present invention, Figures 2 to 3 As shown, the base paper layer 4 includes an antibacterial coating 41 and a paper layer 42 sandwiched between the antibacterial coatings 41, and the antibacterial coating 41 is a nano silver coating with a thickness of 20μm-30μm. The release paper in the utility model is provided with a waterproof and breathable film layer 31 on the upper and lower sides of the base paper layer 4, which can prevent the release paper from being soaked by water vapor in a humid environment from the longitudinal direction, but a part of the water vapor will still enter the release paper from the side of the release paper and soak the paper layer 42, causing the release paper to mold. The nano silver coating in the antibacterial coating 41 will release silver ions that can kill mold when the paper layer 42 is soaked, thereby preventing the release paper from getting moldy during the natural drying process, thereby increasing the practicality of the release paper for different environments.

[0029] As another preferred embodiment of the utility model, in order to ensure that the release paper has a certain release force, the release layer 1 is a solvent-based silicone oil coating with a thickness of 40μm-50μm. The solvent-based silicone oil has excellent heat resistance, cold resistance, weather resistance, electrical insulation and low surface tension, and can therefore be used as a good release layer 1. The solvent-based silicone oil can have good adhesion to a variety of substrates, so that it can be firmly attached to the substrate, thereby making the release paper have a higher release force. At the same time, the solvent-based silicone oil is easy to process and operate, and can meet various processing requirements. The release layer 1 is usually coated on the surface of the coating layer 2. After the silicone oil coating, the release paper needs to be baked to allow the silicone oil to dry and solidify on the surface of the coating layer 2.

[0030] As another preferred embodiment of the utility model, the coating layer 2 is a polylactic acid film layer with a thickness of 20μm-35μm. Polylactic acid has good film-forming properties and adhesion, so it can be firmly combined with the upper surface of the breathable layer 3 to form a thin film. When producing release paper, the polylactic acid is melted at a temperature of about 175°C, and then the hot-melt polylactic acid is coated on the upper surface of the breathable layer 3. The dried coating is the coating layer 2. The role of the coating layer 2 in the release paper is to prevent the silicone oil in the release layer 1 from penetrating into the breathable layer 3, thereby causing the breathable structure in the breathable layer 3 to be blocked, affecting the breathability of the release paper. At the same time, polylactic acid has a degradable property, which makes the release paper environmentally friendly to a certain extent.

[0031] As another preferred embodiment of the utility model, the breathable fiber layer 32 is a bamboo fiber layer with a thickness of 40μm-60μm. The bamboo fiber material and the TPU waterproof breathable membrane are both breathable materials, so that the breathable layer 3 has good air permeability. The bamboo fiber material has good air permeability and has a certain wear resistance, which can increase the durability of the release paper to a certain extent, thereby extending the service life of the release paper. At the same time, the bamboo fiber has natural antibacterial and antibacterial functions, and cooperates with the nano-silver coating of the antibacterial layer to further prevent the release paper from mold. The bamboo fiber in the breathable fiber layer 32 and the film layer of the coating layer 2 are both degradable, which makes the release paper environmentally friendly.

[0032] As another preferred embodiment of the utility model, the protective layer 5 is a TPU waterproof breathable film with a thickness of 100μm-150μm, and the waterproof breathable film layer 31 is a TPU film layer with a thickness of 100μm-150μm. The protective layer 5 and the waterproof breathable film layer 31 are made of the same material, but have different functions. The waterproof breathable film layer 31 prevents moisture from entering the release paper, causing the inside of the release paper to be wetted and the release paper to lose its use value. The TPU film layer of the protective layer 5 is used on the one hand to protect the antibacterial coating 41 on the lower surface of the base paper layer 4 to prevent the silver ion coating in the antibacterial coating 41 from being worn during the use of the release paper, thereby causing the antibacterial ability of the release paper to decrease. On the other hand, it is used to maintain the overall air permeability of the release paper. The waterproof and breathable property of the TPU waterproof breathable film can be used to prevent the second air hole 7 from being blocked, so that the gas can escape smoothly through the second air hole 7.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A solvent-based silicone oil release paper with a highly air-permeable structure, comprising a release layer (1), a coating layer (2), an air-permeable layer (3) and a base paper layer (4), characterized in that: The release layer (1), the coating layer (2), the breathable layer (3) and the base paper layer (4) are arranged in sequence from top to bottom along the thickness direction of the release paper; a protective layer (5) is provided on the lower surface of the base paper layer (4); a plurality of first air holes (6) are provided in the release layer (1) and the coating layer (2); a plurality of second air holes (7) are provided in the base paper layer (4); the breathable layer (3) comprises a breathable fiber layer (32) and a waterproof breathable film layer (31) arranged on the upper and lower surfaces of the breathable fiber layer (32); a plurality of third air holes (33) are provided in the breathable fiber layer (32); the breathable fiber layer (32) is bent and folded in a corrugated shape between the waterproof breathable film layers (31), and is enclosed with the waterproof breathable film layer (31) to form a transverse breathable groove (34).

2. The solvent-based silicone oil release paper with a highly air-permeable structure according to claim 1, characterized in that: The first pores (6) vertically penetrate the release layer (1) and the coating layer (2) and are evenly distributed in the release layer (1) and the coating layer (2); the second pores (7) vertically penetrate the base paper layer (4) and are evenly distributed in the base paper layer (4); the first pores (6) and the second pores (7) are symmetrically distributed on both sides of the air permeable layer (3).

3. The solvent-based silicone oil release paper with a highly air-permeable structure according to claim 1, characterized in that: The base paper layer (4) comprises an antibacterial coating (41) and a paper layer (42) sandwiched between the antibacterial coatings (41); the antibacterial coating (41) is a nano silver coating with a thickness of 20 μm to 30 μm.

4. The solvent-based silicone oil release paper with a highly air-permeable structure according to claim 1, characterized in that: The release layer (1) is a solvent-based silicone oil coating with a thickness of 40 μm-50 μm.

5. The solvent-based silicone oil release paper with a highly air-permeable structure according to claim 1, characterized in that: The coating layer (2) is a polylactic acid film layer with a thickness of 20 μm-35 μm.

6. The solvent-based silicone oil release paper with a highly air-permeable structure according to claim 1, characterized in that: The breathable fiber layer (32) is a bamboo fiber layer with a thickness of 40 μm-60 μm, and the waterproof breathable membrane layer (31) is a TPU membrane layer with a thickness of 100 μm-150 μm.

7. The solvent-based silicone oil release paper with a highly air-permeable structure according to claim 1, characterized in that: The protective layer (5) is a TPU film layer with a thickness of 100 μm-150 μm.

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