Water-based UV (ultraviolet) visbreaking protective film

Abstract

The utility model discloses a water-based UV (Ultraviolet) visbreaking protective film which comprises a PET (Polyethylene Terephthalate) film layer, the surface of the PET film layer is coated with the water-based adhesive coating layer, and the thickness of the water-based adhesive coating layer is 2-5 [mu] m; the PE film layer is adhered to the water-based adhesive coating layer; the PE film layer is coated with the bottom coating through a reticulated tube coating machine, and a reticulated surface is formed; and the water-based UV glue coating layer is coated on the bottom coating layer. The PET film layer, the water-based glue coating, the PE film layer, the bottom coating and the water-based UV glue coating are matched to form the protective film, so that the stability of the water-based UV viscosity-reducing glue after being coated is ensured, the glue is not wound or remained, the viscosity-reducing speed is stable, and the adhesive force of the glue layer and the film layer is increased. The water-based UV viscosity-reducing film has good adhesion to a base material, so that the water-based UV viscosity-reducing film has the advantages of good light transmission, fast viscosity reduction, stable stripping force, simple construction, low cost and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of thin films, and in particular relates to a water-based UV viscosity-reducing protective film. Background Art

[0002] PET film is a packaging film with a wide range of properties. It offers excellent transparency and gloss, good airtightness and aroma retention, and moderate moisture resistance, though its moisture permeability decreases at low temperatures. PET film also boasts excellent mechanical properties, with the strongest toughness of all thermoplastics, and significantly higher tensile and impact strength than conventional films. It also offers excellent strength and dimensional stability, making it suitable for secondary processing such as printing and paper bags. Viscosity-reducing PET film is primarily used for injection molding decoration and metal substrate coating.

[0003] Currently, the tensile strength of anti-viscosity films is insufficient to meet the requirements of large-angle bending of metal substrates. The surface coating will peel or crack during stretching, resulting in surface texture deformation or whitening around the edges. Furthermore, the glue used in most anti-viscosity films is solvent-based, which has high environmental requirements. The baking temperature generally requires coating conditions of around 145 degrees, requiring companies to have high-configuration ventilation systems. The production process requires solvent dilution and solvent curing agents, which pollutes the environment and keeps costs high. Furthermore, the unstable bond between the adhesive base and the film base leads to residual adhesive residue. The light transmittance is insufficient, and the light transmittance after curing is less than 93%, resulting in a significant difference in the anti-viscosity effect. Furthermore, when exposed to ultraviolet light of various wavelengths, the light source is not transparent enough, making it impossible to achieve the stable viscosity reduction requirement of reducing the viscosity from 300 grams to 30 grams within five seconds.

[0004] Therefore, a protective film with stable coating, no glue entanglement or glue retention, stable viscosity reduction speed, environmental protection and pollution-free, good adhesion to the substrate, and water-based UV viscosity reduction film that can achieve good light transmittance, fast viscosity reduction, stable peeling force, simple construction and low cost is urgently needed to be studied. Utility Model Content

[0005] In view of this, the technical problem to be solved by the present invention is to provide a water-based UV anti-viscosity protective film, which avoids the troubles of difficult water-based coating, unstable curing stability, unstable bonding between the adhesive base and the film base resulting in easy adhesive residue, insufficient light transmittance, and obvious differences in anti-viscosity effect.

[0006] To solve the above technical problems, the utility model discloses a water-based UV anti-viscosity protective film, which includes a PET film layer with a thickness of 10-48 μm, has good impact resistance and wear resistance, and has stable light transmittance, generally between 90% and 95%. It can better allow more ultraviolet rays to pass through while providing good substrate protection.

[0007] Water-based adhesive coating is applied to the surface of the PET film layer with a thickness of 2-5μm. It uses a mixture of water-based polyurethane and acrylic acid. It is environmentally friendly, low-energy, non-toxic and odorless, and has good tensile adhesion to the film. It dries quickly and has good light transmittance after drying. The de-glossing rate is over 90%;

[0008] PE film layer, PE film layer adheres to the water-based adhesive coating; high light transmittance and good tensile strength;

[0009] The primer layer is applied to the PE film layer through an anilox coater to form a mesh surface; it increases the bonding strength between the adhesive layer and the film, improves the adhesion after applying the glue, and ensures a stable peeling force without residual glue or debonding;

[0010] Water-based UV adhesive coating, water-based UV adhesive coating is applied on the base coating.

[0011] According to one embodiment of the present invention, the above-mentioned primer layer is configured as a polyester glue coating.

[0012] According to one embodiment of the present invention, the PE film layer is thinner than the PET film layer and is provided with a plurality of nano-scale hexagonal meshes.

[0013] According to one embodiment of the present invention, the water-based adhesive coating is selected from water-based polyurethane adhesive and acrylic acid.

[0014] According to one embodiment of the present invention, the thickness of the water-based UV adhesive coating is 3-12 μm.

[0015] Compared with the prior art, the present invention can achieve the following technical effects:

[0016] By combining a PET film layer, a water-based adhesive coating, a PE film layer, a primer, and a water-based UV adhesive coating to form a protective film, the stability of the water-based UV anti-viscosity adhesive after application is improved, preventing adhesive entanglement or residue, achieving a steady anti-viscosity speed, and increasing the adhesion of the adhesive layer and film layer. This excellent adhesion to the substrate allows the water-based UV anti-viscosity film to achieve advantages such as good light transmittance, rapid anti-viscosity, stable peeling force, simple construction, and low cost.

[0017] Of course, any product implementing the present utility model does not necessarily need to achieve all of the above-mentioned technical effects at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a 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 an improper limitation of the present invention. In the drawings:

[0019] Figure 1It is a schematic structural diagram of a water-based UV viscosity-reducing protective film according to an embodiment of the present invention.

[0020] Figure ID

[0021] PET film layer 10, water-based adhesive coating layer 20, PE film layer 30, primer coating layer 40, water-based UV adhesive coating layer 50. DETAILED DESCRIPTION

[0022] The following will describe the implementation of the present invention in detail with reference to the accompanying drawings and examples, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0023] Please refer to Figure 1 , Figure 1 It is a schematic structural diagram of a water-based UV viscosity-reducing protective film according to an embodiment of the present invention.

[0024] As shown in the figure, a water-based UV anti-viscosity protective film includes a PET film layer 10, the thickness of the PET film layer 10 is 10-48 μm; a water-based adhesive coating layer 20, the water-based adhesive coating layer 20 is coated on the surface of the PET film layer 10, and the thickness is 2-5 μm; a PE film layer 30, the PE film layer 30 adheres to the water-based adhesive coating layer 20; a primer layer 40, the primer layer 40 is coated on the PE film layer 30 by a corrugated tube coater to form a mesh surface; and a water-based UV adhesive coating layer 50, the water-based UV adhesive coating layer 50 is coated on the primer layer 40.

[0025] In one embodiment of the present invention, the PET film layer 10 is a protective film substrate with good impact resistance, wear resistance, and stable light transmittance, generally between 90% and 95%. It can better allow more ultraviolet rays to pass through while providing good substrate protection. The water-based adhesive coating 20 uses a mixed composite adhesive of water-based polyurethane and acrylic acid, which is environmentally friendly, low-energy, non-toxic and odorless, and has good tensile adhesion to the film. It dries quickly and has good light transmittance after drying. Its light stripping rate is over 90%, mainly due to the connecting adhesive connecting the first layer of PET film 10 and the third layer of PE film 30. PE film has better light transmittance. PE film uses a large amount of imported polyethylene raw materials with low haze values, so that there are no fogging crystal points when the base coat 40 and the water-based UV adhesive coating 50 are applied, and good light transmittance can be maintained. The light transmittance of the PE film can easily reach over 90%. The tensile strength of the PE film itself enables it to better adhere to the metal substrate.

[0026] The base coat 40 is a polyester adhesive coating that increases the bonding strength between the adhesive layer and the film, improving the adhesion after the adhesive is applied, and providing a stable peeling force without residual adhesive or debonding. The adhesive mesh is formed, giving it excellent tensile strength during use.

[0027] Water-based UV adhesive coating 50 is a water-based UV adhesive coating with reduced viscosity. It consists of 5 parts polyester acrylic, 30 parts UV dual-cure resin, 10 parts light curing agent, 10 parts heat curing agent, 2 parts photosensitive adhesive, a water-based emulsifier, some pH adjuster, and some deionized water. The wet adhesive coating thickness ranges from 3μ to 12μ, depending on the product requirements. After coating, conventional curing at 40°C for 12 hours is required. The product maintains a light-proof peel force of 0.30N to 0.55N. After 5 seconds of exposure to UVA light, the tape peel force is reduced to 0.01N-0.03N, demonstrating a strong viscosity-reducing effect and stable water-based coating.

[0028] In a preferred embodiment, the PE film layer 30 is thinner than the PET film layer and is provided with a plurality of nano-scale hexagonal meshes, which can improve the tensile strength and enhance its durability.

[0029] In summary, the present invention utilizes a PET film layer 10, a water-based adhesive coating 20, a PE film layer 30, a primer layer 40, and a water-based UV adhesive coating 50 to form a protective film. This ensures the stability of the water-based UV adhesive after application, preventing adhesive entanglement and residue, achieving a stable adhesive reduction speed, and increasing the adhesion between the adhesive layer and the film layer. This provides excellent substrate adhesion, resulting in a water-based UV adhesive reduction film with advantages such as good light transmittance, rapid adhesive reduction, stable peeling strength, simple application, and low cost.

[0030] The above description shows and describes several preferred embodiments of the present invention. However, as previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the present invention as taught herein or through the techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A water-based UV anti-viscosity protective film, applied to a metal substrate, characterized in that: include: A PET film layer having a thickness of 10-48 μm; A water-based adhesive coating layer is applied on the surface of the PET film layer and has a thickness of 2-5 μm; A PE film layer, wherein the PE film layer is adhered to the water-based adhesive coating; A primer layer, the primer layer is coated on the PE film layer by a mesh tube coater to form a mesh surface; A water-based UV adhesive coating is applied on the base coating.

2. The water-based UV anti-viscosity protective film according to claim 1, characterized in that: The base coating is a polyester glue coating.

3. The water-based UV viscosity-reducing protective film according to claim 1, characterized in that: The PE film layer is thinner than the PET film layer and is provided with a plurality of nano-scale hexagonal meshes.

4. The water-based UV viscosity-reducing protective film according to claim 1, characterized in that: The water-based adhesive coating is selected from water-based polyurethane adhesive and acrylic acid.

5. The water-based UV viscosity-reducing protective film according to claim 1, characterized in that: The thickness of the water-based UV adhesive coating is 3-12 μm.

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