Colored release film and preparation system thereof

Abstract

The colored release film comprises a base material layer (10) and a release agent layer (20), the base material layer (10) is a transparent polyester film of a single-layer or multi-layer structure, the release agent layer (20) is colored, the thickness of the base material layer (10) is 12-100 microns, and the thickness of the release agent layer (20) is 0.5-2 microns. The utility model further provides a color release film preparation system. According to the colored release film prepared by the preparation system disclosed by the invention, the colored release agent layer can be observed from the outer side through the transparent substrate layer, so that the color can be visually felt, and phenomena such as release agent residue or fogging of the release agent can be observed through human eyes; therefore, the quality condition of the release film can be visually obtained without arranging complex tests in advance, real-time monitoring can be achieved, residual errors can be corrected in time, and the like, and the method is of great help to control the product quality in real time.

Description

Technical Field

[0001] The utility model relates to a colored release film and a preparation system thereof. Background Art

[0002] CN 112375437 B discloses a release film substrate, comprising a polyester film and a washcoat, wherein the washcoat is formed on the surface of the polyester film, and a silicone oil release agent is coated on the surface of the washcoat to form a release agent layer; the washcoat comprises the following components: 80-100 parts by weight of acrylic resin, 1-2 parts by weight of dimethyl silylate silica, 10-15 parts by weight of ethanolamine, 0.5-0.8 parts by weight of polyquaternary ammonium salt, 5-10 parts by weight of non-water-soluble carbonate, 1-2 parts by weight of melamine, and 80-100 parts by weight of propylene glycol. The porous hydrophilic washcoat formed on the surface of the polyester film of the prior art greatly improves the surface activity and hydrophilicity of the release film substrate, is conducive to close combination with the silicone oil release agent, and can prevent the release agent from detaching.

[0003] CN 112661995 B discloses a release film for polarizer, comprising a release film substrate and a release agent layer coated on the surface of the release film substrate, wherein the release agent layer is made of a UV-curable release agent prepared from the following raw materials in parts by weight: 60-140 parts by weight of polybutadiene polyurethane, 45-85 parts by weight of polyacrylate resin, 10-25 parts by weight of hydroxypropyl methacrylate, 25-55 parts by weight of trifluoroethyl methacrylate active monomer diluent, 25-55 parts by weight of octadecyl methacrylate active monomer diluent, and 1-5 parts by weight of an initiator of 2-hydroxy-2-methyl-1-phenyl-1-propanone. The UV-curable release agent of the prior art is a UV-curable release agent without silicone oil component, does not require high-temperature baking, has no silicone oil seepage, and eliminates the phenomenon that the PAS glue is pulled up due to the transfer of silicone oil component.

[0004] The release films in the prior art are usually colorless and transparent, and it is sometimes difficult to distinguish whether the release film is applied to the product.

[0005] CN 219544202 U discloses a blue PE double-sided release film, comprising a nano-scale carbon sponge layer and a blue PE film arranged on both sides of the nano-scale carbon sponge layer, a transparent film is arranged on the side of the blue PE film on both sides away from the nano-scale carbon sponge layer, a corona layer is arranged on the side of the transparent film away from the blue PE film, a release layer is arranged on the corona layer, and the release layer is a UV curing nano-mixture coated on the corona layer. The release film substrate of the prior art adopts a blue PE film, which can be easily identified by color.

[0006] Blue PE film is almost the most common film in the film field. Because PE is easily oxidized and turns blue, in order to keep the PE film colorless, it is necessary to add antioxidants to it to delay oxidation. Therefore, the price of colorless PE film is usually higher than that of blue. In short, the general impression is that the quality of blue PE film is worse than that of colorless PE film.

[0007] Except for the blue PE film, the films of other materials are usually colorless. Therefore, to prepare a colored release film, pigments are usually added to the film as the base material, so that the base film presents different colors. For example, the colored release films on the market are usually prepared from base films of various colors such as yellow, red, green, blue, and gray.

[0008] In the field of electronic product technology, the use of adhesive bonding is becoming more and more common. It is also common to bond release films of different colors on the surface of the adhesive layer to distinguish different surfaces. For example, CN 116023866 A discloses a highly weather-resistant ultra-thin adhesive sticker that is easy to attach, including a blue release film, AB glue and a transparent release film arranged in sequence from top to bottom, and the two opposite sides of the AB glue are both sticky. The blue release film used in the prior art is easy to remove quickly when used later.

[0009] As mentioned above, the release film in the prior art is generally colorless, and the color of the colored release film comes from the dyeing of the release film substrate. However, since the release agent on the surface of the release film substrate is generally colorless, it is difficult to distinguish whether the release agent remains after the colored release film is removed.

[0010] For example, CN 113155822 A discloses a method for testing the anti-fogging performance of a silicone release agent, including weighing a sample to be tested, covering with paper, stirring the sample, curing the release agent, dyeing the cover paper, and comparing the dyed sample with a standard sample, thereby intuitively obtaining the anti-fogging performance result of the test sample. The cover paper used in the prior art is a plant fiber material paper, and the dye used for dyeing is a dye that can color the fiber, such as Shirlastain A fiber identification agent or malachite green dye, etc. The working principle of the prior art is that under a suitable stirring state, the silicone release agent will form an aerosol that overflows from the liquid surface and is adsorbed on the cover paper of the stirring container, and the cover paper adsorbed with the cured release agent is used for dyeing, because the silicone release agent and the paper fiber will show different colors when encountering the dye, thereby obtaining the amount of release agent on the cover paper and reflecting the quality of the anti-fogging performance of the measured sample.

[0011] It can be seen from the prior art that the release agent is difficult to observe and distinguish in an intuitive way, and requires additional complex processes for prior testing. However, even if a release agent that meets the composite quality requirements can be obtained, the residue of the release agent is still difficult to distinguish during actual use, and quality control can only be carried out through testing. Summary of the invention

[0012] The technical problem to be solved by the present application is to provide a colored release film and a preparation system thereof, so as to reduce or avoid the above-mentioned problems.

[0013] In order to solve the above technical problems, the present application proposes a colored release film, comprising a substrate layer and a release agent layer, wherein the substrate layer is a transparent polyester film of a single-layer or multi-layer structure, the release agent layer is colored, the thickness of the substrate layer is 12-100 μm, and the thickness of the release agent layer is 0.5-2 μm.

[0014] The present application also proposes a color release film preparation system, wherein the color release film includes a substrate layer and a release agent layer, wherein the preparation system at least includes a release agent preparation device, wherein the outlet of the release agent preparation device is connected to the inlet of a coating device, the outlet of the coating device is connected to the inlet of a vacuum defoaming device, and the outlet of the vacuum defoaming device is connected to the inlet of a curing device; wherein the release agent prepared by the release agent preparation device is conveyed to a coating device for coating the release agent on the surface of the substrate layer, the substrate layer coated with the release agent is conveyed from the coating device to a vacuum defoaming device for defoaming the release agent, and the release film after the vacuum defoaming treatment is conveyed to a curing device for curing the release agent by ultraviolet light irradiation under nitrogen conditions.

[0015] Preferably, the release agent preparation equipment comprises at least a release agent mixing tank for polyurethane acrylate, 6 (ethoxy) trimethylolpropane triacrylate, diacetone alcohol, tridecafluorooctyl acrylate, a solid particle mixture of surface-modified modified pigments and benzophenone, wherein the release agent mixing tank is provided with a magnetic stirring device.

[0016] Preferably, the preparation system further includes a device for modifying the inorganic pigment, including: a pigment mixing tank for adding the inorganic pigment to the polyvinyl alcohol aqueous solution; the pigment mixing tank further includes an input pipeline for adding sodium tripolyphosphate; the outlet of the pigment mixing tank is connected to a freeze-drying spray device; the solid particle mixture prepared by the freeze-drying spray device is input into the inlet of the release agent preparation device.

[0017] The colored release film prepared by the preparation system of the present application can observe the colored release agent layer from the outside through the transparent substrate layer, so that the color can be visually felt, and the release agent residue or the fogging of the release agent can be observed by the human eye. Therefore, the quality of the release film can be intuitively obtained without arranging complicated tests in advance, and real-time monitoring can be achieved and residual errors can be corrected in time, which is of great help in real-time control of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are only intended to illustrate and explain the present application, and do not limit the scope of the present application.

[0019] Figure 1 Shown is a schematic structural diagram of a colored release film according to a specific embodiment of the present application.

[0020] Figure 2 Shown is a schematic structural diagram of a system for preparing a colored release film according to another specific embodiment of the present application.

[0021] Figure 3 Shown are the available Figure 2 The schematic structural diagram of the inorganic pigment modification processing device of the preparation system shown. DETAILED DESCRIPTION

[0022] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation of the present application is now described with reference to the accompanying drawings, wherein the same components are numbered the same.

[0023] In view of the technical problems described in the background technology, the present application proposes a colored release film, such as Figure 1 As shown, it includes a substrate layer 10 and a release agent layer 20, wherein the substrate layer 10 is made of a transparent polyester film of a single-layer or multi-layer structure, and the release agent layer 20 is made of a colored release agent added with a colored pigment.

[0024] The use of a transparent substrate layer 10 facilitates observation of the colored release agent layer 20 from the outside, so that the color can be visually felt. If the substrate layer is not transparent, the color cannot be seen, and there is no so-called colored release film. In addition, the use of a colored release agent allows the human eye to observe the release agent residue or the fogging of the release agent, so that the quality of the release film can be intuitively obtained without arranging complex tests in advance, and real-time monitoring can be achieved and residual errors can be corrected in a timely manner, which is of great help in real-time control of product quality.

[0025] In a specific embodiment of the present application, the thickness of the substrate layer 10 is 12-100 μm, and the thickness of the release agent layer 20 is 0.5-2 μm.

[0026] In another specific embodiment of the present application, the colored release agent is prepared from the following components in parts by weight: 100-200 parts by weight of polyurethane acrylate, 60-80 parts by weight of 6(ethoxy)trimethylolpropane triacrylate, 20-40 parts by weight of diacetone alcohol, 30-50 parts by weight of tridecafluorooctyl acrylate, 2.5-4.5 parts by weight of a solid particle mixture of modified pigments, and 3-5 parts by weight of benzophenone.

[0027] The modified pigment is preferably an inorganic pigment that has been surface-modified, such as one of alkali-resistant inorganic pigments such as red iron oxide, cadmium sulfide, ultramarine, or a mixture thereof. Although inorganic pigments are not as bright in color as organic pigments, they are cheap and easy to obtain. Moreover, inorganic pigments are relatively easier to disperse and are easy to maintain their original color after surface modification. In addition, alkali-resistant inorganic pigments are easy to change color after oxidation, making it easy to identify whether the release film is falling off or deteriorating.

[0028] Furthermore, the surface modification treatment step of the modified pigment includes: adding 10-20 parts by weight of inorganic pigment to 100-200 parts by weight of polyvinyl alcohol aqueous solution, stirring continuously for 60-120 minutes to fully disperse; then adding 6-8 parts by weight of sodium tripolyphosphate and stirring continuously for 60-120 minutes to fully mix to obtain a dispersed mixture; finally, freeze-drying and spraying the dispersed mixture to obtain a solid particle mixture of the modified pigment with surface modification treatment. The content of polyvinyl alcohol in the polyvinyl alcohol aqueous solution is 10wt%-15wt%.

[0029] Example 1

[0030] 100 parts by weight of polyurethane acrylate, 60 parts by weight of 6 (ethoxy) trimethylolpropane triacrylate, 20 parts by weight of diacetone alcohol, 30 parts by weight of octyl tridecafluoroacrylate, and 2.5 parts by weight of a surface-modified solid particle mixture (iron oxide red) were uniformly mixed, 3 parts by weight of benzophenone were added, and magnetic stirring was performed for 120 seconds to obtain a release agent. The release agent was uniformly coated on the surface of a substrate layer with a thickness of 12 μm, vacuum defoamed for 1 hour, and cured by ultraviolet light under N2 conditions for 180 seconds to form a release agent layer, and the thickness of the release agent layer was measured to be 0.5 μm.

[0031] Comparative Example 1

[0032] The release film was prepared by the same process as in Example 1, except that 6 (ethoxy) trimethylolpropane triacrylate was removed from the release agent component, and the contents of other components were adjusted. The specific components were: 140 parts by weight of polyurethane acrylate, 20 parts by weight of diacetone alcohol, 50 parts by weight of tridecafluorooctyl acrylate, 2.5 parts by weight of a modified pigment solid particle mixture (iron oxide red), and 3 parts by weight of benzophenone.

[0033] Example 2

[0034] 150 parts by weight of polyurethane acrylate, 70 parts by weight of 6 (ethoxy) trimethylolpropane triacrylate, 30 parts by weight of diacetone alcohol, 40 parts by weight of octyl tridecafluoroacrylate, and 3.0 parts by weight of a surface-modified solid particle mixture (cadmium sulfide) were uniformly mixed, 4 parts by weight of benzophenone were added, and magnetic stirring was performed for 180 seconds to obtain a release agent. The release agent was uniformly coated on the surface of a substrate layer with a thickness of 50 μm, vacuum defoamed for 1.5 hours, and cured under N2 conditions by ultraviolet light for 240 seconds to form a release agent layer, and the thickness of the release agent layer was measured to be 1 μm.

[0035] Comparative Example 2

[0036] The release film was prepared by the same process as in Example 2, except that diacetone alcohol was removed from the release agent component, and the contents of other components were adjusted. The specific components were: 170 parts by weight of polyurethane acrylate, 80 parts by weight of 6 (ethoxy) trimethylolpropane triacrylate, 40 parts by weight of acrylate tridecafluorooctyl ester, 3.0 parts by weight of a surface-modified solid particle mixture (cadmium sulfide), which were uniformly mixed, and 4 parts by weight of benzophenone were added.

[0037] Example 3

[0038] 200 parts by weight of polyurethane acrylate, 80 parts by weight of 6 (ethoxy) trimethylolpropane triacrylate, 40 parts by weight of diacetone alcohol, 50 parts by weight of acrylate tridecafluorooctyl ester, and 4.5 parts by weight of a surface-modified solid particle mixture (ultramarine) were uniformly mixed, 5 parts by weight of benzophenone were added, and magnetic stirring was performed for 240 seconds to obtain a release agent. The release agent was uniformly coated on the surface of a substrate layer with a thickness of 100 μm, vacuum defoamed for 2 hours, and cured by ultraviolet light under N2 conditions for 300 seconds to form a release agent layer, and the thickness of the release agent layer was measured to be 2 μm.

[0039] Comparative Example 3

[0040] The release film was prepared by the same process as in Example 3, except that 13-fluorooctyl acrylate was removed from the release agent component, and the contents of other components were adjusted. The specific components were: 230 parts by weight of polyurethane acrylate, 90 parts by weight of 6 (ethoxy) trimethylolpropane triacrylate, 50 parts by weight of diacetone alcohol, 4.5 parts by weight of a surface-modified solid particle mixture (ultramarine) were uniformly mixed, and 5 parts by weight of benzophenone was added.

[0041] The parameter performances of the above embodiments and comparative examples are shown in the following table.

[0042]

[0043] Examples 4-6 and Comparative Examples 4-6

[0044] The components of the modified pigments of Examples 1-3 were adjusted and tested for performance. The weight parts of the components of the modified pigments of Examples 4-6 and Comparative Examples 4-6 are shown in the following table.

[0045]

[0046] Among them, comparative example 4 does not use polyvinyl alcohol aqueous solution, so it cannot be prepared by dispersion spraying, but only fully mixes iron oxide red and sodium tripolyphosphate into a solid particle mixture. Comparative example 5 does not add sodium tripolyphosphate, and comparative example 6 reduces the amount of polyvinyl alcohol and sodium tripolyphosphate. The particle size of the inorganic pigment is selected to be 10-15nm.

[0047] Through the aforementioned modification process, a solid particle mixture was prepared and applied to the release films of Examples 1 to 3, respectively. Among them, Example 4 and Comparative Example 4 were used for the release film of Example 1, Example 5 and Comparative Example 5 were used for the release film of Example 2, and Example 6 and Comparative Example 6 were used for the release film of Example 3.

[0048] The color distribution uniformity of the release films of Examples 4-6 and Comparative Examples 4-6 was tested respectively, and the index was the average density of color spots per 10 square centimeters (pieces / 10cm 2 ), wherein the values ​​of Examples 4-6 are all less than 0.1, and the values ​​of Comparative Examples 4-6 are 8.6, 5.4, and 2.3, respectively. Among them, the pigment dispersion of Comparative Example 4 is not good enough, and the agglomeration is more serious. The colors of Comparative Examples 5 and 6 are obviously lighter than those of Examples 5 and 6, and the color of Comparative Example 5 is almost colorless, and the reason is unknown.

[0049] In addition, in view of the colored release film and preparation method proposed in the present application, the present application further proposes a corresponding colored release film preparation system.

[0050] like Figure 2 As shown, the preparation system of the colored release film of the present application at least includes a release agent preparation device 100, the outlet of the release agent preparation device 100 is connected to the inlet of the coating device 200, the outlet of the coating device 200 is connected to the inlet of the vacuum defoaming device 300, and the outlet of the vacuum defoaming device 300 is connected to the inlet of the curing device 400; wherein, the release agent prepared by the release agent preparation device 100 is conveyed to the coating device 200 for coating the release agent on the surface of the substrate layer, the substrate layer coated with the release agent is conveyed from the coating device 200 to the vacuum defoaming device 300 for defoaming the release agent, and the release film after the vacuum defoaming treatment is conveyed to the curing device 400 for curing the release agent by ultraviolet light under nitrogen conditions.

[0051] Furthermore, if Figure 2As shown, the release agent preparation equipment 100 at least includes a release agent mixing tank 101 for a solid particle mixture of polyurethane acrylate, 6 (ethoxy) trimethylolpropane triacrylate, diacetone alcohol, tridecafluorooctyl acrylate, surface-modified modified pigments, and benzophenone, wherein the release agent mixing tank 101 is provided with a magnetic stirring device 102.

[0052] Furthermore, if Figure 3 As shown, the preparation system of the colored release film of the present application may also include a device for modifying the inorganic pigment, including: a pigment mixing tank 110 for adding the inorganic pigment to the polyvinyl alcohol aqueous solution; the pigment mixing tank 110 further includes an input pipe 112 for adding sodium tripolyphosphate; the outlet of the pigment mixing tank 110 is connected to a freeze-drying spray device 114; the solid particle mixture prepared by the freeze-drying spray device 114 is input into the inlet of the release agent preparation device 100, that is, the inlet of the release agent mixing tank 101 of the release agent preparation device 100.

[0053] Those skilled in the art should understand that although the present application is described in the form of multiple embodiments, not every embodiment contains only one independent technical solution. Such description in the specification is only for the sake of clarity, and those skilled in the art should understand the specification as a whole and regard the technical solutions involved in each embodiment as being able to be combined into different embodiments to understand the scope of protection of the present application.

[0054] The above description is only an illustrative embodiment of the present application and is not intended to limit the scope of the present application. Any equivalent changes, modifications and combinations made by any technician in the field without departing from the concept and principle of the present application shall fall within the scope of protection of the present application.

Claims

1. A colored release film, comprising a substrate layer (10) and a release agent layer (20), characterized in that: The substrate layer (10) is a transparent polyester film of a single-layer or multi-layer structure, the release agent layer (20) is colored, the substrate layer (10) has a thickness of 12-100 µm, and the release agent layer (20) has a thickness of 0.5-2 µm.

2. A system for preparing a colored release film, the colored release film comprising a substrate layer (10) and a release agent layer (20), the substrate layer (10) being a transparent polyester film of a single-layer or multi-layer structure, the release agent layer (20) being colored, the substrate layer (10) having a thickness of 12-100 µm, the release agent layer (20) having a thickness of 0.5-2 µm, and characterized in that: The preparation system at least comprises a release agent preparation device (100), wherein the outlet of the release agent preparation device (100) is connected to the inlet of a coating device (200), the outlet of the coating device (200) is connected to the inlet of a vacuum defoaming device (300), and the outlet of the vacuum defoaming device (300) is connected to the inlet of a curing device (400); wherein the release agent prepared by the release agent preparation device (100) is transported to the coating device (200) for coating the release agent on the surface of a substrate layer (10), the substrate layer (10) coated with the release agent is transported from the coating device (200) to the vacuum defoaming device (300) for defoaming the release agent, and the release film after the vacuum defoaming treatment is transported to the curing device (400) for curing the release agent by ultraviolet light irradiation under nitrogen conditions.

3. The preparation system according to claim 2, characterized in that: The release agent preparation device (100) comprises at least a release agent mixing tank (101) for a mixture of solid particles of polyurethane acrylate, 6 (ethoxy) trimethylolpropane triacrylate, diacetone alcohol, tridecafluorooctyl acrylate, a surface-modified modified pigment, and benzophenone, wherein the release agent mixing tank (101) is provided with a magnetic stirring device (102).

4. The preparation system according to claim 2, characterized in that: The preparation system further comprises a device for modifying the inorganic pigment, comprising: a pigment mixing tank (110) for adding the inorganic pigment to the polyvinyl alcohol aqueous solution; the pigment mixing tank (110) further comprises an input pipeline (112) for adding sodium tripolyphosphate; the outlet of the pigment mixing tank (110) is connected to a freeze-drying spray device (114); and the solid particle mixture prepared by the freeze-drying spray device (114) is input into the inlet of the release agent preparation device (100).

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