Release film coating preparation system

Abstract

The utility model discloses a release film coating and a preparation system, the preparation system is used for coating and curing on the surface of a release film base film (1) to form a layer of release film coating (2), the preparation system comprises a discharging roll (100) for releasing the release film base film (1), a blade coating device (200) is arranged at the downstream of the discharging roll (100), and the blade coating device (200) is arranged at the downstream of the discharging roll (100). A low-temperature heating roller (301), a medium-temperature heating roller (302) and a high-temperature heating roller (303) are sequentially arranged at the downstream of the blade coating equipment (200); uV curing equipment (400) is arranged at the downstream of the high-temperature heating roller (303), and a receiving roll (500) for winding the coated release film base film (1) is arranged at the downstream of the UV curing equipment (400). According to the utility model, the special release film coating preparation system is designed and provided, so that the release film coating with high flatness can be continuously prepared and obtained on the surface of the release film base film.

Description

Technical Field

[0001] This utility model relates to a release film coating preparation system. Background Technology

[0002] CN 110239185 B discloses a release film for MLCCs. This prior art mentions the need for release films with flatness and uniform thickness in the field of precision electronics manufacturing. The starting point of this prior art is to improve the base film of the release film to reduce the surface roughness of the base film and have a smoother surface.

[0003] CN 112375437 B discloses a release film substrate, comprising a polyester film and an activated coating. The activated coating includes an acrylic resin, a dimethyl silylated silica surfactant, an ethanolamine surface etchant, a polyquaternary ammonium salt surfactant bactericide, a water-insoluble carbonate, a melamine curing agent, and a propylene glycol solvent. This prior art release film substrate features a porous, hydrophilic activated coating formed on the surface of the polyester film, significantly enhancing the surface activity and hydrophilicity of the release film substrate, which facilitates tight bonding with silicone oil-based release agents and prevents release agent detachment. However, the porous coating increases surface roughness, making it difficult to control the uniformity of the coating's smoothness and thickness.

[0004] Therefore, for precision manufacturing fields such as MLCC release films, achieving a high degree of surface flatness requires improving the uniformity of existing release film coatings. On the other hand, current technologies lack a continuous fabrication system for preparing high-flatness release film coatings on release film substrates. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a release film coating preparation system to reduce or avoid the problems mentioned above.

[0006] To solve the above-mentioned technical problems, this utility model proposes a preparation system for release film coating, which is used to coat and cure a release film coating on the surface of a release film base film to form a release film coating. The preparation system includes a release roll for releasing the release film base film, a coating device downstream of the release roll, and a low-temperature heating roller, a medium-temperature heating roller, and a high-temperature heating roller sequentially downstream of the coating device. A UV curing device is located downstream of the high-temperature heating roller, and a take-up roll for winding the coated release film base film is located downstream of the UV curing device.

[0007] Preferably, the inlet of the scraping device is connected to the outlet of the coating liquid delivery tank.

[0008] Preferably, the inlet of the coating liquid delivery tank is connected to the stirring vessel for preparing the coating liquid.

[0009] Preferably, the heating temperature of the low-temperature heating roller is set to 50-60℃, the heating temperature of the medium-temperature heating roller is set to 90-110℃, and the heating temperature of the high-temperature heating roller is set to 130-150℃.

[0010] Preferably, the coating speed of the scraper coating equipment is 20m / min-40m / min.

[0011] This invention designs and proposes a dedicated release film coating preparation system, which can continuously prepare and obtain a release film coating with high flatness on the surface of the release film base film. Attached Figure Description

[0012] The accompanying drawings are intended only to illustrate and explain this application and do not limit the scope of this utility model.

[0013] Figure 1 The diagram shown is a structural schematic of a release film according to a specific embodiment of the present invention.

[0014] Figure 2 The diagram shown is a structural schematic of a system for preparing a release film coating according to a specific embodiment of the present invention. Detailed Implementation

[0015] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, specific embodiments are now described with reference to the accompanying drawings. Identical components are denoted by the same reference numerals.

[0016] As described in the background art, for release films requiring high flatness in precision manufacturing, a feasible solution is to coat the base film surface of the release film with a coating of uniform thickness to improve the overall flatness of the release film base film.

[0017] In view of this, the present invention provides an improved release film coating for coating and curing on the surface of the release film base film, which can obtain a highly flat surface for attaching the release agent layer and makes it easier to obtain a uniform coating thickness.

[0018] like Figure 1 The diagram shown illustrates the structure of a release film according to a specific embodiment of the present invention. (See also...) Figure 1 The release film of this utility model includes a release film substrate 1 made of PET, a release film coating 2 of this application formed by coating and curing the surface of the release film substrate 1, and a release agent layer 3 coated on the surface of the release film coating 2. Both the release film substrate 1 and the release agent layer 3 can be prepared using materials conventional in the art. The key to this application is the proposed optimized release film coating 2.

[0019] In one specific embodiment of this utility model, the release film coating 2 of this utility model may be composed of the following components in parts by weight: 60-80 parts by weight of modified acrylic resin, 20-30 parts by weight of fluorinated modified polyurethane dispersion, 2-4 parts by weight of surface fluorinated modified siloxane particles, 0.8-1.5 parts by weight of perfluoropolyether (PFPE) polyurethane acrylate, 0.3-0.5 parts by weight of ethoxylated polyether, and 8-10 parts by weight of three-component curing agent.

[0020] The three-component curing agent is composed of the following components in weight percentage: 20-30% hexamethylene triisocyanate, 40-60% polyether polyol, and 10-20% polyurea.

[0021] Among them, modified acrylic resin is used as the basic film-forming component. It is preferably a modified acrylic resin containing hydroxyl and phosphate groups, which can improve the adhesion to the base film and at the same time give the coating better self-leveling and chemical stability.

[0022] In one specific embodiment, the modified acrylic resin is composed of the following components in parts by weight: 10-15 parts by weight of hydroxyethyl methacrylate (HEMA), 3-5 parts by weight of phosphate dihydrogen methacrylate (MAPA), 30-40 parts by weight of methyl methacrylate (MMA), 30-40 parts by weight of butyl acrylate (BA), 2-5 parts by weight of glycidyl acrylate (GMA), 75-160 parts by weight of ethyl acetate, 7-20 parts by weight of p-methoxyphenol (MEHQ), and 37-105 parts by weight of azobisisobutyronitrile (AIBN).

[0023] In another specific embodiment, the modified acrylic resin described above can be prepared by the following steps: Ethyl acetate solvent is added to a reactor equipped with stirring and reflux condenser, heated to 60-70°C, and stirred stably. HEMA, MAPA, MMA, BA, and GMA are uniformly mixed according to the specified ratio to form a monomer mixture. The polymerization inhibitor MEHQ is added to prevent premature polymerization. The monomer mixture with added MEHQ and AIBN initiator are added dropwise through a separatory funnel to the reactor containing ethyl acetate, with the addition time controlled within 2-3 hours to ensure complete monomer reaction. After the addition is complete, the temperature is raised to 80-90°C, and the reaction continues for 2-3 hours to complete the polymerization. After the reaction is complete, the mixture is cooled to room temperature, filtered to remove insoluble matter, and a transparent or slightly yellow modified acrylic resin solution is obtained for later use. The performance indicators of the prepared modified acrylic resin are as follows: solid content approximately 40-50%; hydroxyl value 60-90 mg KOH / g; acid value 20-30 mg KOH / g; molecular weight (Mw): 10000-30000 g / mol.

[0024] Furthermore, the fluorinated modified polyurethane dispersion is also used as a basic film-forming component, preferably a fluorinated modified polyurethane hydrophobic structure, which makes the surface of the coating smoother after curing, while improving weather resistance and wear resistance.

[0025] In one specific embodiment, the fluorinated modified polyurethane dispersion may be a mixture of an aqueous polyurethane and a fluoroketone compound. Specifically, for example, the aqueous polyurethane may be selected from BASF's Aqua PU series, and the fluoroketone compound may be selected from nonafluoro-4-(trifluoromethyl)-3-pentanone, such as 3M's Novec 1230 Fluorochemical.

[0026] In another specific embodiment, the mixture ratio of the aqueous polyurethane and the fluoroketone compound (e.g., nonafluoro-4-(trifluoromethyl)-3-pentanone) is: 95%-99.5% by weight of the aqueous polyurethane (e.g., BASF's Aqua PU) and 0.5%-5% by weight of the fluoroketone compound (e.g., nonafluoro-4-(trifluoromethyl)-3-pentanone).

[0027] Furthermore, the surface-fluorinated modified siloxane particles are fluorinated modified siloxanes (particle size: 20-50nm), which not only enhances the mechanical properties of the coating, but also avoids filler agglomeration that leads to surface roughness.

[0028] Specifically, the surface-fluorinated modified siloxane particles can be, for example, siloxane composites with surface-fluorinated modified FluoroSiloxane from INDOMET (Germany); or surface-fluorinated modified silica nanoparticles (F-SiNPs) from NanoComposix (USA).

[0029] Furthermore, perfluoropolyether polyurethane acrylates are used to improve the spreadability and surface smoothness of coatings, avoiding streaks or ripples. Specifically, perfluoropolyether polyurethane acrylates can be selected from, for example, Cytonix's FluorAcryl 1939 perfluoropolyether (PFPE) polyurethane acrylate.

[0030] Furthermore, ethoxylated polyethers are used to improve the wettability of substrate surfaces and reduce paint buildup after coating. Specifically, ethoxylated polyethers can be selected from, for example, BYK-356 ethoxylated polyether wetting agent from BYK Corporation.

[0031] In one specific embodiment of the present invention, the release film coating 2 of the present invention can be prepared and formed on the surface of the release film substrate 1 by the following steps.

[0032] For example, the coating liquid is prepared first. The specific steps are as follows: Add the previously prepared modified acrylic resin to a stirred tank, stirring at 100-300 rpm, while gradually adding the fluorinated modified polyurethane dispersion. Add perfluoropolyether polyurethane acrylate and ethoxylated polyether to the stirred tank, maintaining a stirring speed of 100-300 rpm to ensure uniform mixing. While maintaining the stirring speed, gradually add the surface-fluorinated modified siloxane particles to the stirred tank. After addition, stir at high speed for 5-10 minutes at 1000-3000 rpm to ensure the particles are uniformly dispersed in the coating liquid. Add the mixed three-component curing agent to the coating liquid, stirring at 300-500 rpm to ensure uniformity.

[0033] Then, the prepared coating liquid is applied to the surface of the release film base film 1. The specific steps are as follows: using a blade coating device, the coating liquid is evenly applied to the substrate surface. Coating speed: 20m / min-40m / min.

[0034] Next, the coating undergoes segmented heating and curing. The specific steps are as follows: After coating, the film is first heated by a low-temperature heating roller at 50-60℃ to extend the leveling time, allowing the coating to spread completely and improving its uniformity. Then, the film enters a medium-temperature heating roller at 90-110℃ to control the solvent evaporation rate and prevent surface defects caused by excessive evaporation. Finally, the film enters a high-temperature heating roller at 130-150℃ to ensure complete cross-linking and a smooth surface.

[0035] Finally, the coating is UV cured. The specific steps are as follows: after passing through a high-temperature heated roller, the film layer enters a UV curing device for curing. After heat drying, the coating still retains a certain degree of fluidity. UV curing at this point effectively improves the surface quality of the coating, enhancing surface smoothness and wear resistance, and preventing surface defects caused by environmental factors. In the coating formulation of this invention, the modified acrylic resin contains double bond structures such as acrylates (e.g., glycidyl acrylate, GMA), which can undergo cross-linking and curing through a free radical reaction initiated by UV light. In perfluoropolyether polyurethane acrylate (PFPE-acrylate), the PFPE ends contain acrylate groups, which can rapidly cross-link under UV light to form a highly dense coating. In one specific embodiment, a low-dose UV light source with a wavelength of 365nm (200mJ / cm²) can be used for UV curing. 2 To avoid overheating or surface shrinkage of the coating due to excessive ultraviolet radiation.

[0036] Furthermore, this application also proposes a method specifically for Figure 1 The continuous preparation system for release film coating 2 shown is as follows: Figure 2 As shown. Specifically, the preparation system of this application is used to coat and cure a release film coating 2 on the surface of the release film base film 1. The preparation system includes a release roll 100 for releasing the release film base film 1, a coating device 200 downstream of the release roll 100, and a low-temperature heating roller 301, a medium-temperature heating roller 302, and a high-temperature heating roller 303 sequentially downstream of the coating device 200. A UV curing device 400 is located downstream of the high-temperature heating roller 303, and a take-up roll 500 for winding the coated release film base film 1 is located downstream of the UV curing device 400.

[0037] Furthermore, as shown in the figure, the inlet of the coating device 200 can also be connected to the outlet of the coating liquid delivery tank 201. The coating liquid is continuously supplied to the coating device 200 through the coating liquid delivery tank 201.

[0038] Furthermore, as mentioned above, the inlet of the coating liquid delivery tank 201 can also be directly connected to the stirring vessel 202 for preparing the coating liquid. The stirring vessel 202 can continuously prepare the coating liquid, and then continuously output the coating liquid to the scraping device 200.

[0039] Furthermore, as mentioned above, the heating temperature set for the low-temperature heating roller 301 is 50-60℃, the heating temperature set for the medium-temperature heating roller 302 is 90-110℃, and the heating temperature set for the high-temperature heating roller 303 is 130-150℃.

[0040] Furthermore, as mentioned above, the coating speed of the coating equipment 200 is 20m / min-40m / min.

[0041] The superior performance of the release film coating of this invention will be further described in detail below through specific embodiments.

[0042] Example 1

[0043] Formula: Modified acrylic resin: 65 parts by weight, fluorinated modified polyurethane dispersion: 25 parts by weight, surface fluorinated modified siloxane particles: 3 parts by weight, perfluoropolyether (PFPE) polyurethane acrylate: 1.2 parts by weight, ethoxylated polyether: 0.4 parts by weight, three-component curing agent: 9 parts by weight.

[0044] Process parameters: Coating speed: 25 m / min, Leveling zone temperature: 60℃, Initial drying zone temperature: 100℃, Curing zone temperature: 140℃, UV curing: 365nm, 200mJ / cm 2 Coating thickness: 15μm.

[0045] Performance parameters: Adhesion: 4B (tape test); Abrasion resistance: Taber abrasion test: 10mg; UV resistance: After 2000 hours of QUV accelerated aging, the surface showed no obvious yellowing; Surface smoothness: Ra = 0.15μm.

[0046] Example 2

[0047] Formulation: Modified acrylic resin: 70 parts by weight, fluorinated modified polyurethane dispersion: 22 parts by weight, surface fluorinated modified siloxane particles: 2.5 parts by weight, perfluoropolyether (PFPE) polyurethane acrylate: 1.0 part by weight, ethoxylated polyether: 0.3 parts by weight, three-component curing agent: 8 parts by weight.

[0048] Process parameters: Coating speed: 30 m / min, Leveling zone temperature: 50℃, Initial drying zone temperature: 90℃, Curing zone temperature: 130℃, UV curing: 365nm, 250mJ / cm 2 Coating thickness: 12μm.

[0049] Performance parameters: Adhesion: 5B (tape test), Abrasion resistance: Taber abrasion test: 8mg, Chemical resistance: After immersion in 5% hydrochloric acid for 48 hours, there is no obvious corrosion or fading, Surface smoothness: Ra = 0.18μm.

[0050] Example 3

[0051] Formula: Modified acrylic resin: 80 parts by weight, fluorinated modified polyurethane dispersion: 20 parts by weight, surface fluorinated modified siloxane particles: 3 parts by weight, perfluoropolyether (PFPE) polyurethane acrylate: 1.5 parts by weight, ethoxylated polyether: 0.5 parts by weight, three-component curing agent: 10 parts by weight.

[0052] Process parameters: Coating speed: 20 m / min, Leveling zone temperature: 55℃, Initial drying zone temperature: 95℃, Curing zone temperature: 135℃, UV curing: 365nm, 220 mJ / cm 2 Coating thickness: 20μm.

[0053] Performance parameters: Adhesion: 4B (tape test), Abrasion resistance: Taber abrasion test: 12mg, Weather resistance: No obvious aging, after 1000 hours of QUV accelerated aging, Color difference ΔE≤2, Surface smoothness: Ra=0.17μm.

[0054] Example 4

[0055] Formula: Modified acrylic resin: 75 parts by weight, fluorinated modified polyurethane dispersion: 25 parts by weight, surface fluorinated modified siloxane particles: 2 parts by weight, perfluoropolyether (PFPE) polyurethane acrylate: 1.0 part by weight, ethoxylated polyether: 0.3 parts by weight, three-component curing agent: 9 parts by weight.

[0056] Process parameters: Coating speed: 35 m / min, Leveling zone temperature: 60℃, Initial drying zone temperature: 100℃, Curing zone temperature: 145℃, UV curing: 365 nm, 240 mJ / cm 2 Coating thickness: 10μm.

[0057] Performance parameters: Adhesion: 5B (tape test), Abrasion resistance: Taber abrasion test: 7mg, Chemical resistance: No significant change after immersion in ethanol for 48 hours, Surface smoothness: Ra = 0.16μm.

[0058] Example 5

[0059] Formula: Modified acrylic resin: 60 parts by weight, fluorinated modified polyurethane dispersion: 30 parts by weight, surface fluorinated modified siloxane particles: 4 parts by weight, perfluoropolyether (PFPE) polyurethane acrylate: 0.8 parts by weight, ethoxylated polyether: 0.5 parts by weight, three-component curing agent: 8 parts by weight.

[0060] Process parameters: Coating speed: 25 m / min, Leveling zone temperature: 50℃, Initial drying zone temperature: 90℃, Curing zone temperature: 130℃, UV curing: 365nm, 220mJ / cm 2 Coating thickness: 18μm.

[0061] Performance parameters: Adhesion: 4B (tape test), Abrasion resistance: Taber abrasion test: 11mg, UV resistance: after 2000 hours of QUV accelerated aging, the surface showed no obvious yellowing, and the surface smoothness was Ra = 0.18μm.

[0062] Example 6

[0063] Formula: Modified acrylic resin: 70 parts by weight, fluorinated modified polyurethane dispersion: 30 parts by weight, surface fluorinated modified siloxane particles: 2 parts by weight, perfluoropolyether (PFPE) polyurethane acrylate: 1.0 part by weight, ethoxylated polyether: 0.4 parts by weight, three-component curing agent: 8 parts by weight.

[0064] Process parameters: Coating speed: 28 m / min, Leveling zone temperature: 58℃, Initial drying zone temperature: 95℃, Curing zone temperature: 140℃, UV curing: 365nm, 230mJ / cm 2 Coating thickness: 16μm.

[0065] Performance parameters: Adhesion: 5B (tape test), Abrasion resistance: Taber abrasion test: 9mg, Chemical resistance: No significant change after immersion in acetic acid solution for 48 hours, Surface smoothness: Ra = 0.15μm.

[0066] The above embodiments provide different combinations of formulations and process parameters, all of which can achieve excellent coating performance.

[0067] Comparative Example 1 (corresponding to Example 1): Perfluoropolyether (PFPE) polyurethane acrylate is omitted.

[0068] Formulation: Modified acrylic resin: 65 parts by weight, fluorinated modified polyurethane dispersion: 25 parts by weight, surface fluorinated modified siloxane particles: 3 parts by weight, ethoxylated polyether: 0.4 parts by weight, three-component curing agent: 9 parts by weight.

[0069] Process parameters: Coating speed: 25 m / min, Leveling zone temperature: 60℃, Initial drying zone temperature: 100℃, Curing zone temperature: 140℃, UV curing: 365nm, 200mJ / cm 2 Coating thickness: 15μm.

[0070] Performance parameters: Adhesion: 3B; Abrasion resistance: Taber abrasion test: 20mg; UV resistance: After 2000 hours of QUV accelerated aging, obvious yellowing occurred; Surface smoothness: Ra = 0.35μm.

[0071] Comparative Example 2 (corresponding to Example 2): Surface fluorinated modified siloxane particles are omitted.

[0072] Formulation: Modified acrylic resin: 65 parts by weight, fluorinated modified polyurethane dispersion: 25 parts by weight, perfluoropolyether (PFPE) polyurethane acrylate: 1.2 parts by weight, ethoxylated polyether: 0.4 parts by weight, three-component curing agent: 9 parts by weight.

[0073] Process parameters: Coating speed: 25 m / min, Leveling zone temperature: 60℃, Initial drying zone temperature: 100℃, Curing zone temperature: 140℃, UV curing: 365nm, 200mJ / cm 2 Coating thickness: 15μm.

[0074] Performance parameters: Adhesion: 3B, Abrasion resistance: Taber abrasion test: 25mg, UV resistance: After 2000 hours of QUV accelerated aging, the surface yellows significantly, and the surface smoothness: Ra = 0.45μm.

[0075] Comparative Example 3 (corresponding to Example 3): Ethoxylated polyether is omitted.

[0076] Formula: Modified acrylic resin: 65 parts by weight, fluorinated modified polyurethane dispersion: 25 parts by weight, surface fluorinated modified siloxane particles: 3 parts by weight, perfluoropolyether (PFPE) polyurethane acrylate: 1.2 parts by weight, three-component curing agent: 9 parts by weight.

[0077] Process parameters: Coating speed: 25 m / min, Leveling zone temperature: 60℃, Initial drying zone temperature: 100℃, Curing zone temperature: 140℃, UV curing: 365nm, 200mJ / cm 2 Coating thickness: 15μm.

[0078] Performance parameters: Adhesion: 4B, Abrasion resistance: Taber abrasion test: 15mg, UV resistance: After 2000 hours of QUV accelerated aging, the surface showed no obvious yellowing, and the surface smoothness was Ra = 0.5μm.

[0079] Comparative Example 4 (corresponding to Example 4): The three-component curing agent is omitted.

[0080] Formulation: Modified acrylic resin: 65 parts by weight, fluorinated modified polyurethane dispersion: 25 parts by weight, surface fluorinated modified siloxane particles: 3 parts by weight, perfluoropolyether (PFPE) polyurethane acrylate: 1.2 parts by weight, ethoxylated polyether: 0.4 parts by weight.

[0081] Process parameters: Coating speed: 25 m / min, Leveling zone temperature: 60℃, Initial drying zone temperature: 100℃, Curing zone temperature: 140℃, UV curing: 365nm, 200mJ / cm 2 Coating thickness: 15μm.

[0082] Performance parameters: Adhesion: 2B, Abrasion resistance: Taber abrasion test: 40mg, UV resistance: After 2000 hours of QUV accelerated aging, obvious yellowing occurs, Surface smoothness: Ra=0.55μm.

[0083] Comparative Example 5 (corresponding to Example 5): Modified acrylic resin omitted.

[0084] Formulation: Fluorine-modified polyurethane dispersion: 25 parts by weight, surface fluorinated modified siloxane particles: 3 parts by weight, perfluoropolyether (PFPE) polyurethane acrylate: 1.2 parts by weight, ethoxylated polyether: 0.4 parts by weight, three-component curing agent: 9 parts by weight.

[0085] Process parameters: Coating speed: 25 m / min, Leveling zone temperature: 60℃, Initial drying zone temperature: 100℃, Curing zone temperature: 140℃, UV curing: 365nm, 200mJ / cm 2 Coating thickness: 15μm.

[0086] Performance parameters: Adhesion: 3B, Abrasion resistance: Taber abrasion test: 30mg, UV resistance: After 2000 hours of QUV accelerated aging, the surface yellows significantly, and the surface smoothness: Ra = 0.6μm.

[0087] Comparative Example 6 (corresponding to Example 6): Fluorine-modified polyurethane dispersion omitted.

[0088] Formula: Modified acrylic resin: 65 parts by weight, surface fluorinated modified siloxane particles: 3 parts by weight, perfluoropolyether (PFPE) polyurethane acrylate: 1.2 parts by weight, ethoxylated polyether: 0.4 parts by weight, three-component curing agent: 9 parts by weight.

[0089] Process parameters: Coating speed: 25 m / min, Leveling zone temperature: 60℃, Initial drying zone temperature: 100℃, Curing zone temperature: 140℃, UV curing: 365nm, 200mJ / cm 2 Coating thickness: 15μm.

[0090] Performance parameters: Adhesion: 2B, Abrasion resistance: Taber abrasion test: 50mg, UV resistance: After 2000 hours of QUV accelerated aging, the surface yellows significantly, and the surface smoothness: Ra = 0.65μm.

[0091] The coating formulation and process of this invention, through careful selection and optimization of components, significantly improve the smoothness and other properties of the coating. A comparison of Examples 1-6 with Comparative Examples 1-6 clearly demonstrates the impact of formulation and process optimization on coating performance.

[0092] For example, in the coating formulation of this invention, modified acrylic resin is one of the basic components of the coating, providing good film-forming properties and abrasion resistance, while also possessing good crosslinking ability. In the embodiments, by selecting suitable reactive monomers and adding appropriate amounts of modifiers (such as HEMA and MAPA), the leveling and adhesion of the resin were optimized, thereby improving the surface smoothness of the coating. In the comparative examples and comparative cases, it can be seen that modified acrylic resin plays a crucial role in improving the uniformity and smoothness of the coating surface.

[0093] Fluorine-modified polyurethane dispersions introduce fluorine, which helps reduce the surface energy of the coating, thereby improving its water resistance, weather resistance, and stain resistance. Furthermore, the fluorine-modified components improve the smoothness of the coating, resulting in a smoother surface and preventing localized blistering or cracking. In Examples 1-6, by optimizing the amount of fluorine-modified polyurethane dispersion and the ratio of other components, the surface smoothness of the coating was effectively improved.

[0094] Surface-fluorinated modified siloxane particles enhance coating hardness and improve wear resistance, while also improving coating leveling. Their surface treatment enhances compatibility with other components, further promoting coating uniformity and surface smoothness. By optimizing particle dispersibility and selecting appropriate addition amounts, the surface quality of the coating can be significantly improved, avoiding rough or uneven coating surfaces.

[0095] The introduction of perfluoropolyether polyurethane acrylate not only improves the water resistance and weather resistance of the coating, but also further enhances its smoothness. The flexibility of the perfluoropolyether molecular chain allows the coating to flow well during curing, eliminating bubbles and surface unevenness. An appropriate amount of perfluoropolyether plays a crucial role in the examples, particularly in improving coating thickness and surface smoothness.

[0096] The three-component curing agent consists of hexamethylene isophorone triisocyanate, polyether polyol, and polyurea. The ratio of these components optimizes the curing process of the coating, enabling uniform cross-linking at high temperatures and resulting in better mechanical properties and surface smoothness. By appropriately adjusting the curing agent, the cross-linking density of the coating can be effectively controlled, thereby avoiding unevenness defects on the coating surface.

[0097] In summary, the formulation and process of this invention, through the combination of modified acrylic resin, fluorinated modified polyurethane dispersion, and surface-fluorinated modified siloxane particles, improve the smoothness, adhesion, and abrasion resistance of the coating. By optimizing the ratio of the curing agent and the coating process, good smoothness and consistency of the coating are ensured during the curing process. The introduction of perfluoropolyether polyurethane acrylate further enhances the water resistance and leveling properties of the coating, ensuring a smoother surface and reducing roughness. Through the improvements in the formulation and process of this invention, the smoothness, adhesion, abrasion resistance, and weather resistance of the release film coating are significantly improved, meeting the high standards required by industries such as high-end electronics manufacturing.

[0098] Those skilled in the art should understand that although the present invention has been described with reference to multiple embodiments, not every embodiment contains only one independent technical solution. This description is provided merely for clarity; those skilled in the art should understand the specification as a whole and consider the technical solutions involved in each embodiment as being able to be combined with each other to form different embodiments to understand the scope of protection of the present invention.

[0099] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A release film coating preparation system for coating and curing a release film coating (2) on the surface of a release film base film (1), characterized in that, The preparation system includes a feed roll (100) for releasing the release film base film (1), a coating device (200) is provided downstream of the feed roll (100), and a low-temperature heating roller (301), a medium-temperature heating roller (302) and a high-temperature heating roller (303) are sequentially provided downstream of the coating device (200); a UV curing device (400) is provided downstream of the high-temperature heating roller (303), and a take-up roll (500) for winding the coated release film base film (1) is provided downstream of the UV curing device (400).

2. The release film coating preparation system as described in claim 1, characterized in that, The inlet of the scraping device (200) is connected to the outlet of the coating liquid delivery tank (201).

3. The release film coating preparation system as described in claim 2, characterized in that, The inlet of the coating liquid delivery tank (201) is connected to the stirring vessel (202) for preparing the coating liquid.

4. The release film coating preparation system as described in claim 1, characterized in that, The heating temperature set for the low-temperature heating roller (301) is 50-60℃, the heating temperature set for the medium-temperature heating roller (302) is 90-110℃, and the heating temperature set for the high-temperature heating roller (303) is 130-150℃.

5. The release film coating preparation system as described in claim 1, characterized in that, The coating speed of the scraping device (200) is 20 m / min-40 m / min.

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