Frosted texture film and preparation method thereof

Abstract

The present application relates to a new frosted texture film and a preparation method thereof. The frosted texture film is composed of a substrate layer and a frosted texture coating layer covered thereon, and the frosted texture coating layer is formed by photocuring a specific frosted coating liquid after heat treatment. The frosted coating liquid mainly comprises a solvent-free curing composition and a frosted slurry, wherein the frosted slurry is added with heat-expandable microspheres. The solvent-free curing composition ensures rapid and efficient curing of the coating while avoiding environmental pollution. By adjusting the ratio of each component and the type and quantity of the heat-expandable microspheres, the frosted texture film can adapt to different application scenarios and customer needs. The preparation method includes the steps of preparing a frosted coating liquid, coating, heating treatment and curing. By optimizing parameters and conditions, the sandy tactile and visual beauty can be achieved at a lower coating amount, while improving production efficiency and reducing production costs.

Description

Technical Field

[0001] The present application relates to the technical field of functional films, and in particular to a frosted texture film and a preparation method thereof. Background Art

[0002] As a packaging material that combines visual beauty with tactile sensation, frosted film has shown a wide range of application potential in the packaging field due to its unique sandy feel. Traditionally, the realization of this frosted effect relies on various treatments on the surface of the material to create uneven microstructures. When light is diffusely reflected on these structures, a visual frosted texture is formed. However, as the market's requirements for product experience continue to increase, consumers are no longer satisfied with a single visual requirement, but expect frosted film products to provide a richer and more delicate tactile experience while retaining their elegant appearance.

[0003] At present, the industry has made some progress in improving the touch of frosted films. A common method is to use frosted glue with high light transmittance to create a frosted effect through coating and thermal curing processes. However, this solution has significant environmental pollution problems, because the solvent-based coating liquid will volatilize harmful solvents during the production process, which not only requires the drying equipment to occupy a large space, but also limits the increase in production speed. Another method is to prepare frosted particles of different particle sizes by adjusting the proportion of raw materials, and use coating technology to transfer these particles to the substrate film. Although this method can achieve a frosted effect, in order to obtain a strong frosted touch, large-size particles must be used in combination with a deeper anilox coating roller, which will result in a significant increase in the amount of wet glue applied, thereby pushing up production costs.

[0004] In addition, there is a technical solution for preparing a high-transmittance matte coating using a UV ultraviolet curing system. This solution achieves a matte effect by combining an organic solvent diluent with a UV-curable matte oil resin or matte powder, and has the advantages of high curing efficiency, high coating cross-linking degree, and good scratch resistance. However, the volatilization of solvents is still an environmental and health issue that cannot be ignored, which limits its application in a wider range of fields.

[0005] In summary, the current method of coating and preparing frosted texture films is mainly based on solvent-based formula products, which enhance the frosted touch by generating a height difference between the frosted powder particles and the cured resin through solvent volatilization. However, in pursuit of a stronger frosted feel, this method requires the use of particles with larger particle sizes and matching deeper anilox roller coating, which not only increases the wet coating amount, but also leads to an increase in overall costs. At the same time, once the frosted raised effect in the prior art is formed, it cannot be adjusted, which limits the flexibility and personalized customization capabilities of the product. Therefore, how to maintain the visual beauty of the frosted film while improving its tactile experience and overcoming the problems of environmental pollution, cost control, and lack of flexibility in the prior art is still an urgent problem to be solved in the current field of frosted texture films and their manufacturing methods. Summary of the invention

[0006] The purpose of the present application is to provide a frosted texture film and a preparation process thereof, using a frosted coating liquid containing heat-expandable particles, to achieve a sandy tactile and visual aesthetic effect at a relatively low coating amount by heating, and to quickly cure the frosted coating after thermal expansion, thereby improving overall production efficiency. The frosted texture film of the present application includes a substrate layer and a frosted texture coating formed on the substrate layer, wherein the frosted texture coating is formed by light curing the frosted coating liquid after heating; The frosted coating liquid comprises the following components in mass fractions: 1-90 parts of a solvent-free curing composition and 1-90 parts of a frosted slurry; The frosting slurry includes heat-expandable microspheres.

[0007] In one embodiment, the frosting slurry includes the following components in parts by weight: 1-9 parts of heat-expandable microspheres, 0-6 parts of silicon dioxide, 0.1-1 parts of silane coupling agents, and 0.1-1 parts of wetting and dispersing agents.

[0008] In one embodiment, the heat-expandable microspheres are thermoplastic polymer microspheres, and the thermoplastic polymer is selected from one or a combination of acrylic resin, vinyl chloride, acrylonitrile resin, vinylidene chloride resin, polyamide, polycarbonate, polyethylene, polyimide, polyphenylene ether, and polypropylene.

[0009] In one embodiment, the average particle size of the heat-expandable microspheres before heating is in the range of 10-24 μm, and the average particle size after heating is in the range of 40-80 μm.

[0010] In one embodiment, the heating temperature of the heat-expandable microspheres is in the range of 70°C to 160°C.

[0011] In one embodiment, the solvent-free curing composition comprises the following components in parts by weight: 20-40 parts of solvent-free UV resin and 0.5-2 parts of UV photoinitiator.

[0012] In one embodiment, the solvent-free UV resin is one or a combination of polyurethane acrylate, polyester acrylate, epoxy acrylate, and silicon-modified acrylate, and the UV photoinitiator is one or a combination of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexyl phenyl ketone, and methyl benzoylformate.

[0013] In one embodiment, the substrate layer is one or a combination of PET, PP, NY, PE, PC, PS, and EVA.

[0014] In addition, the present application further provides a method for preparing a frosted texture film, comprising: Prepare frosted coating liquid; Applying the frosted coating liquid on the substrate layer; Heat treatment of the coating; After the heating treatment, it is light-cured to form a frosted texture coating; The frosted coating liquid comprises the following components in mass fractions: 1-90 parts of a solvent-free curing composition and 1-90 parts of a frosted slurry, wherein the frosted slurry comprises thermally expandable microspheres.

[0015] Compared with the prior art, this application has the following beneficial effects: The present application abandons the traditional method of preparing a frosted texture that relies on solvent volatilization and particle size matching, and adopts heat-expandable microspheres as the core component of the frosted texture coating. These microspheres can be controllably expanded to a preset multiple during the heating process. By precisely controlling the temperature of the heating oven and the speed of the production equipment, an outstanding sandy tactile and visual aesthetic effect can be achieved at a lower coating amount. The heat-expandable microspheres in the present application provide greater flexibility and adjustability, making the realization of the frosted texture more precise and controllable.

[0016] The frosted texture film preparation process of the present application adopts a solvent-free curing composition, which avoids the environmental pollution problem caused by solvent volatilization and is more friendly to the production environment and users. The solvent-free system not only reduces the generation and treatment costs of waste, but also reduces the risk of fire during storage and use, thereby broadening the application scenarios and market potential of the product.

[0017] In order to obtain a strong matte feel, traditional technologies often require the use of large-size particles and matching deeper coating rollers, which results in an increase in the amount of wet glue applied and an increase in cost. However, the present application uses small-size heat-expandable microspheres and matches them with a shallower coating roller. After coating, the desired raised feel can be achieved through heating and expansion, which not only reduces the amount of wet glue applied, but also reduces material consumption and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a frosted texture film in an embodiment of the present application; Figure 2 It is a schematic diagram of the process of preparing the frosted texture film in the embodiment of the present application.

[0019] Explanation of reference numerals: 100, substrate layer; 200, matte texture coating layer; 300, thermal expansion type microspheres. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0021] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] With the growing market demand for high-end packaging materials, frosted texture film stands out among many packaging materials with its unique aesthetic effect and tactile experience, becoming an important means to enhance product added value and market competitiveness. The preparation of traditional frosted texture film mainly relies on solvent-based formula and frosted particles with matching particle size, but this method not only has environmental pollution problems, but also has limitations in cost control and tactile adjustment. In order to solve these problems, this application proposes an innovative frosted texture film and its preparation method, please refer to Figure 1 , Figure 1: is a schematic diagram of the structure of the matte texture film in an embodiment of the present application, which contains a matte coating liquid with heat-expandable particles, and can show a sandy tactile and visual aesthetic effect at a lower coating amount by heating. The matte texture film in the present application includes a substrate layer 100 and a matte texture coating 200 formed on the substrate layer 100, and the matte texture coating 200 is formed by photocuring the matte coating liquid after heating treatment, and the matte coating liquid includes the following components in mass fractions: 1-90 parts of a solvent-free curing composition and 1-90 parts of a matte slurry, and the matte slurry includes heat-expandable microspheres 300.

[0024] The matte texture film in the present application is a composite material, and its structure is mainly composed of a substrate layer 100 and a matte texture coating 200 covering the substrate layer 100. The matte texture coating 200 is formed by photocuring a specific matte coating liquid after heat treatment. The formula of the matte coating liquid is formulated and includes two main components: a solvent-free curing composition and a matte slurry. Heat-expandable microspheres 300 are added to the matte slurry. These microspheres expand when heated, thereby forming tiny protruding structures in the coating, giving the film a unique matte touch. In this way, the visual effect of the film is enhanced, while the richness and layering of its touch are improved.

[0025] Due to the use of a solvent-free curing composition, the frosted texture film of the present application does not require the use of solvents during the production process, thereby greatly reducing pollution to the environment. By adding heat-expandable microspheres 300 and expanding them through heat treatment, the frosted texture film of the present application can form a unique frosted raised structure, and a strong sandy touch can be achieved with a lower coating amount, which can reduce the cost of raw materials. By adjusting the mass fraction ratio of the solvent-free curing composition and the frosted slurry, as well as the type and quantity of the heat-expandable microspheres 300, the frosted texture film of the present application can flexibly adapt to different application scenarios and customer needs.

[0026] Specifically, the frosted slurry includes the following components in parts by weight: 1-9 parts of heat-expandable microspheres, 0-6 parts of silicon dioxide, 0.1-1 parts of silane coupling agents, and 0.1-1 parts of wetting and dispersing agents. As the main component of the frosted slurry, the heat-expandable microspheres 300 have a mass fraction of 1-9 parts, which is the key to forming the raised structure in the frosted texture coating 200. The microspheres expand when heated, thereby forming tiny protrusions in the coating. As a high-quality filler, silicon dioxide has an adjustable mass fraction between 0-6 parts. Its addition can not only improve the hardness and wear resistance of the frosted texture coating 200, but also improve the leveling and glossiness of the coating. Silicon dioxide can also serve as a carrier for the heat-expandable microspheres 300, which helps to evenly distribute the microspheres in the coating. The mass fraction of the silane coupling agent is controlled between 0.1 and 1 parts, and its role is to enhance the compatibility and adhesion of the components in the frosted slurry, thereby improving the adhesion between the frosted texture coating 200 and the substrate layer 100. The silane coupling agent can also improve the water resistance and weather resistance of the coating and extend the service life of the product. The role of the wetting and dispersing agent is to ensure that the components in the frosted slurry can be fully wetted and dispersed in the solvent to form a uniform mixture, which helps to improve the uniformity and consistency of the frosted texture coating 200 and reduce defects and flaws in the coating. By accurately controlling the mass fractions of components such as thermal expansion microspheres 300 and silica, the frosted texture film of the present application can form a more delicate and uniform frosted raised structure.

[0027] The silicon dioxide is one or a combination of hydrophobic gas silica and modified hydrophobic gas silica, and its model is one or a combination of two of Evonik TT3300, Evonik TS100, and Cabot TS530. The silane coupling agent is one or a combination of vinyl silane and amino silane. The wetting dispersant is one or a combination of ionic dispersants and high molecular polymer dispersants, and its model is one or a combination of two of TEGO Dispers 651, TEGO Dispers 653, and Mingling Chemical EDAPLAN 711. Specifically, the heat-expandable microspheres 300 are heat-expandable microcapsules (also called yangba powder) or thermoplastic polymer microspheres encapsulating gas, and the thermoplastic polymer is selected from one or a combination of acrylic resin, vinyl chloride, acrylonitrile resin, vinylidene chloride resin, polyamide, polycarbonate, polyethylene, polyimide, polyphenylene ether, and polypropylene. Preferably, the heat-expandable microspheres 300 are hollow acrylic polymer microspheres, and the models are one or a combination of two of Nouryon 031DU40, 043DU80, or Aozhide Chemical LA-4001S.

[0028] Specifically, the average particle size of the heat-expandable microspheres 300 before heating is in the range of 10-24 μm, and the average particle size after heating is in the range of 40-80 μm. The heat-expandable microspheres 300 in the frosted slurry used in the frosted texture film in this application are key components, and the particle size changes before and after heating have been precisely designed and controlled. The average particle size of these microspheres before heating is selected to be in the range of 10-24 μm to ensure that they can be evenly distributed in the coating to form a delicate frosted base. When these microspheres are heated and expanded, their average particle size will increase and the particle size is controlled within the range of 40-80 μm. By precisely controlling the production of a raised structure in the coating, the film material is given a unique frosted touch and visual effect. The average particle size of the microspheres before heating is small, so that they can be evenly distributed in the coating, avoiding the problem of uneven or rough matte texture caused by excessive particle size, which ensures that the final product has a delicate and uniform matte touch. The average particle size of the microspheres increases significantly after heating, forming obvious raised structures. These structures will produce unique visual effects under the irradiation of light, such as light and shadow changes, enhanced layering, etc., thereby improving the aesthetics of the product. Since the microspheres expand to form raised structures after heating, these structures can increase the roughness of the coating surface, thereby improving its wear resistance and durability, and can maintain good performance and appearance during long-term use. By controlling the range of particle size changes of the microspheres before and after heating, the frosting degree and visual effect of the matte texture film can be flexibly adjusted, so that the matte texture film of the present application can adapt to different application scenarios and customer needs. Furthermore, the heating temperature of the heat-expandable microspheres 300 is in the range of 70° C. to 160° C. Within the above temperature range, the expansion of the heat-expandable microspheres 300 can be more controllable and the microspheres can be prevented from rupturing, thereby preventing the convex feeling from becoming a pricking feeling.

[0029] Specifically, the solvent-free curing composition comprises the following components in parts by mass: 20-40 parts of solvent-free UV resin and 0.5-2 parts of UV photoinitiator.

[0030] Specifically, the solvent-free UV resin is one or a combination of polyurethane acrylate, polyester acrylate, epoxy acrylate, and silicon-modified acrylate, and the UV photoinitiator is one or a combination of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexyl phenyl ketone, and methyl benzoylformate.

[0031] Specifically, the substrate layer 100 is one or a combination of PET, PP, NY, PE, PC, PS, and EVA.

[0032] In addition, the present application also provides a method for preparing a frosted texture film, comprising: The frosted coating liquid is prepared, and the specific steps include first turning on the stirrer of the batching container at a stirring speed of 200-300r / min, accurately weighing the UV resin and adding it to the container, adding the UV photoinitiator, and stirring for 10-15min; then, the wetting dispersant and the silane coupling agent are added to the container in turn, the stirring speed is increased to 400-800r / min, and the heat-expandable microspheres 300 and the fumed silica are added in turn, stirring for 1-2h, and finally filtering through a 100-mesh filter to obtain the frosted coating liquid.

[0033] The frosted coating liquid is coated on the substrate layer 100. In the specific implementation steps, the PET film substrate is unrolled and loaded onto the machine, and the frosted coating liquid is coated on the substrate by gravure coating, with a coating amount of 1-10 g / m 2 , coating roller line count 200-80L / inch, coating roller volume 15-60cm 3 / m 2 , the coating environment and coating liquid temperature range are controlled to 20-30°C. Preferably, the coating amount of the frosted coating liquid is 10g / m 2 , coating roller line count 90L / inch.

[0034] The coating is heated. In the specific implementation steps, the film substrate after sizing is driven by the equipment to pass through the high-temperature drying unit. The heating and drying oven is divided into 5 sections with temperature segment control and controllable air intake. The 5-section temperature setting range is controlled to 80-130℃.

[0035] After the frosted texture coating 200 is heat-treated, the expanded particles are clearly visible on the coating, and the surface is dry but still in an uncured state. The resin is then completely cured by ultraviolet light UV curing, thereby completing the preparation of the frosted texture film.

[0036] The frosted coating liquid comprises the following components in mass fractions: 1-90 parts of a solvent-free curing composition and 1-90 parts of a frosted slurry, wherein the frosted slurry comprises thermally expandable microspheres 300 .

[0037] Specifically, the coating method is gravure coating or slit coating in a roll-to-roll manner.

[0038] Specifically, the curing step is performed by ultraviolet light irradiation, and the UV irradiation conditions in the curing area are: 300-500MJ / cm 2 , 3-21 lamps, power on 50-100%, vehicle speed controlled within 20-80m / min. Preferably, UV curing 500MJ / cm 2 , power 100%, speed 40m / min.

[0039] The frosted coating is fully cured by UV curing and can be rolled up directly without sticking to each other. The wear resistance of the frosted texture film after curing is qualified when rubbed back and forth with steel wool for more than 2000 times with a 200g weight. The glossiness of the product is 60° and adjustable from 3-55°.

[0040] This application uses a unique frosted coating liquid containing heat-expandable particles, and successfully achieves a sandy touch and visual beauty at a lower coating amount by precisely controlling the parameters of the heating and drying unit in the coating equipment and the equipment operating speed. At the same time, UV light curing technology is introduced. As a fast and efficient polymerization method, it has extremely high energy utilization, can save up to 90% of energy, and can instantly cure the frosted texture coating 200 after heat expansion, thereby improving production efficiency. In addition, this application uses a solvent-free system, which is not only environmentally friendly, but also the prepared frosted texture film has extremely low odor, which is in line with modern environmental protection concepts. The frosted raised feeling is achieved by shaping the expanded microspheres during the curing process. This innovation allows a strong sandy touch to be obtained at a low coating amount even when a shallow anilox coating roller is used, thereby effectively reducing production costs.

[0041] The following will combine this specific embodiment to further clearly demonstrate the technical solution of the present application and explain the influence of relevant control factors on the technical effect.

[0042] Example 1 A frosted texture film of this embodiment includes the following components in parts by weight: The solvent-free system includes 30 parts of UV resin, 1 part of UV photoinitiator, 1.2 parts of heat-expandable microspheres, 0.5 parts of silicon dioxide, 0.5 parts of silane coupling agent, and 0.6 parts of wetting and dispersing agent.

[0043] The UV resin was EBECRYL®8311, purchased from Allnex.

[0044] The UV photoinitiator was HDMAP, purchased from Allnex.

[0045] The heat-expandable microspheres were 031DU40, purchased from Nouryon.

[0046] The fumed silica was TS100 purchased from Evonik.

[0047] The silane coupling agent was A-174, purchased from Momentive.

[0048] The wetting and dispersing agent was TEGO Dispers 653, purchased from Evonik.

[0049] The specific preparation method comprises the following steps: S1. Stirring speed 200r / min, accurately weigh UV resin and add it into the container, add UV photoinitiator and stir for 10min; then add wetting dispersant and silane coupling agent into the container in turn, increase stirring speed to 600r / min, add thermal expansion microspheres and fumed silica in turn, stir for 2h. Finally, filter through a 100-mesh filter to obtain a frosted texture coating liquid.

[0050] S2. Unwind the PET film substrate and put it on the machine. Apply the frosted coating liquid on the substrate by gravure coating. The coating amount is 8g / m 2 The temperature settings of the five sections of the heating and drying oven are 90°C / 100°C / 120°C / 100°C / 80°C, and after drying, the film is cured by UV irradiation, with the UV power turned on at 100% and the speed at 40 m / min. Finally, the matte texture film is rolled up.

[0051] Example 2 A frosted texture film of this embodiment includes the following components in parts by weight: The solvent-free system includes 30 parts of UV resin, 1 part of UV photoinitiator, 1.2 parts of heat-expandable microspheres, 0.5 parts of fumed silica, 0.5 parts of silane coupling agent, and 0.6 parts of wetting and dispersing agent.

[0052] The UV resin was EBECRYL®8311, purchased from Allnex.

[0053] The UV photoinitiator was HDMAP, purchased from Allnex.

[0054] The heat-expandable microspheres were 031DU40, purchased from Nouryon.

[0055] The fumed silica was TS100 purchased from Evonik.

[0056] The silane coupling agent was A-174 purchased from Momentive.

[0057] The wetting and dispersing agent was TEGO Dispers 653, purchased from Evonik.

[0058] The specific preparation method comprises the following steps: S1. Stirring speed 200r / min, accurately weigh UV resin and add it into the container, add UV photoinitiator and stir for 10min; then add wetting dispersant and silane coupling agent into the container in turn, increase stirring speed to 600r / min, add thermal expansion microspheres and fumed silica in turn, stir for 2h. Finally, filter through a 100-mesh filter to obtain a frosted texture coating liquid.

[0059] S2. Unwind the PET film substrate and put it on the machine. Apply the frosted coating liquid on the substrate by gravure coating. The coating amount is 8g / m 2The temperature settings of the five sections of the heating and drying oven are 100°C / 110°C / 130°C / 110°C / 90°C (compared with Example 1), and after drying, the film is cured by UV irradiation, with the UV power turned on at 100% and the speed at 40 m / min. Finally, the matte texture film is rolled up.

[0060] Example 3 A frosted texture film of this embodiment includes the following components in parts by weight: The solvent-free system includes 30 parts of UV resin, 1 part of UV photoinitiator, 1 part of heat-expandable microspheres (compared with Example 2), 0.5 parts of fumed silica, 0.5 parts of silane coupling agent, and 0.6 parts of wetting and dispersing agent.

[0061] The UV resin was EBECRYL®8311, purchased from Allnex.

[0062] The UV photoinitiator was HDMAP, purchased from Allnex.

[0063] The heat-expandable microspheres were 043DU80 (compared with Example 2), purchased from Nouryon.

[0064] The fumed silica was TS100 purchased from Evonik.

[0065] The silane coupling agent was A-174, purchased from Momentive.

[0066] The wetting and dispersing agent was TEGO Dispers 653, purchased from Evonik.

[0067] The specific preparation method comprises the following steps: S1. Stirring speed 200r / min, accurately weigh UV resin and add it into the container, add UV photoinitiator and stir for 10min; then add wetting dispersant and silane coupling agent into the container in turn, increase stirring speed to 600r / min, add thermal expansion microspheres and fumed silica in turn, stir for 2h. Finally, filter through a 100-mesh filter to obtain a frosted texture coating liquid.

[0068] S2. Unwind the PET film substrate and put it on the machine. Apply the frosted coating liquid on the substrate by gravure coating. The coating amount is 8g / m 2 The temperature settings of the five sections of the heating and drying oven are 100°C / 110°C / 130°C / 110°C / 90°C, and after drying, the film is cured by UV irradiation, with the UV power turned on at 100% and the speed at 40 m / min. Finally, the matte texture film is rolled up.

[0069] Example 4 A frosted texture film of this embodiment includes the following components in parts by weight: The solvent-free system includes 30 parts of UV resin, 1 part of UV photoinitiator, 1.2 parts of heat-expandable microspheres, 0.5 parts of fumed silica, 0.5 parts of silane coupling agent, and 0.6 parts of wetting and dispersing agent.

[0070] The UV resin was EBECRYL®8311, purchased from Allnex.

[0071] The UV photoinitiator was HDMAP, purchased from Allnex.

[0072] The heat-expandable microspheres were 043DU80, purchased from Nouryon.

[0073] The fumed silica was TS100 purchased from Evonik.

[0074] The silane coupling agent was A-174, purchased from Momentive.

[0075] The wetting and dispersing agent was TEGO Dispers 653, purchased from Evonik.

[0076] The specific preparation method comprises the following steps: S1. Stirring speed 200r / min, accurately weigh UV resin and add it into the container, add UV photoinitiator and stir for 10min; then add wetting dispersant and silane coupling agent into the container in turn, increase stirring speed to 600r / min, add thermal expansion microspheres and fumed silica in turn, stir for 2h. Finally, filter through a 100-mesh filter to obtain a frosted texture coating liquid.

[0077] S2. Unwind the PET film substrate and put it on the machine. Apply the frosted coating liquid on the substrate by gravure coating. The coating amount is 8g / m 2 The temperature settings of the five sections of the heating and drying oven are 100°C / 110°C / 130°C / 110°C / 90°C, and after drying, the film is cured by UV irradiation, with the UV power turned on at 100% and the speed at 50 m / min (compared with Example 2). Finally, the matte texture film is rolled up to obtain the above-mentioned film.

[0078] Example 5 A frosted texture film of this embodiment includes the following components in parts by weight: The solvent-free system includes 30 parts of UV resin, 1 part of UV photoinitiator, 0.6 parts of heat-expandable microspheres (compared with Example 4), 0.5 parts of fumed silica, 0.5 parts of silane coupling agent, and 0.6 parts of wetting and dispersing agent.

[0079] The UV resin was EBECRYL®8311, purchased from Allnex.

[0080] The UV photoinitiator was HDMAP, purchased from Allnex.

[0081] The heat-expandable microspheres were 043DU80, purchased from Nouryon.

[0082] The fumed silica was TS100 purchased from Evonik.

[0083] The silane coupling agent was A-174, purchased from Momentive.

[0084] The wetting and dispersing agent was TEGO Dispers 653, purchased from Evonik.

[0085] The specific preparation method comprises the following steps: S1. Stirring speed 200r / min, accurately weigh UV resin and add it into the container, add UV photoinitiator and stir for 10min; then add wetting dispersant and silane coupling agent into the container in turn, increase stirring speed to 600r / min, add thermal expansion microspheres and fumed silica in turn, stir for 2h. Finally, filter through a 100-mesh filter to obtain a frosted texture coating liquid.

[0086] S2. Unwind the PET film substrate and put it on the machine. Apply the frosted coating liquid on the substrate by gravure coating. The coating amount is 8g / m 2 The temperature settings of the five sections of the heating and drying oven are 100°C / 110°C / 130°C / 110°C / 90°C, and after drying, the film is cured by UV irradiation, with the UV power turned on at 100% and the speed at 50 m / min. Finally, the matte texture film is rolled up.

[0087] Comparative Example 1 A frosted texture film of this embodiment includes the following components in parts by weight: The solvent-free system includes 30 parts of UV resin, 1 part of UV photoinitiator, 1.2 parts of heat-expandable microspheres, 0.5 parts of fumed silica, 0.5 parts of silane coupling agent, and 0.6 parts of wetting and dispersing agent.

[0088] The UV resin was EBECRYL®8311, purchased from Allnex.

[0089] The UV photoinitiator was HDMAP, purchased from Allnex.

[0090] The heat-expandable microspheres were 031DU40, purchased from Nouryon.

[0091] The fumed silica was TS100 purchased from Evonik.

[0092] The silane coupling agent was A-174, purchased from Momentive.

[0093] The wetting and dispersing agent was TEGO Dispers 653, purchased from Evonik.

[0094] The specific preparation method comprises the following steps: S1. Stirring speed 200r / min, accurately weigh UV resin and add it into the container, add UV photoinitiator and stir for 10min; then add wetting dispersant and silane coupling agent into the container in turn, increase stirring speed to 600r / min, add thermal expansion microspheres and fumed silica in turn, stir for 2h. Finally, filter through a 100-mesh filter to obtain a frosted texture coating liquid.

[0095] S2. Unwind the PET film substrate and put it on the machine. Apply the frosted coating liquid on the substrate by gravure coating. The coating amount is 8g / m 2 The heating and drying oven was not turned on, and after drying, it was cured by UV irradiation, the UV power was turned on 100%, and the speed was 40 m / min. Finally, the matte texture film was rolled up to obtain the frosted texture film.

[0096] Comparative Example 2 A frosted texture film of this embodiment includes the following components in parts by weight: The solvent-free system includes 30 parts of UV resin, 1 part of UV photoinitiator, 1.2 parts of heat-expandable microspheres, 0.5 parts of fumed silica, 0.5 parts of silane coupling agent, and 0.6 parts of wetting and dispersing agent.

[0097] The UV resin was EBECRYL®8311, purchased from Allnex.

[0098] The UV photoinitiator was HDMAP, purchased from Allnex.

[0099] The heat-expandable microspheres were 031DU40, purchased from Nouryon.

[0100] The fumed silica was TS100 purchased from Evonik.

[0101] The silane coupling agent was A-174, purchased from Momentive.

[0102] The wetting and dispersing agent was TEGO Dispers 653, purchased from Evonik.

[0103] The specific preparation method comprises the following steps: S1. Stirring speed 200r / min, accurately weigh UV resin and add it into the container, add UV photoinitiator and stir for 10min; then add wetting dispersant and silane coupling agent into the container in turn, increase stirring speed to 600r / min, add thermal expansion microspheres and fumed silica in turn, stir for 2h. Finally, filter through a 100-mesh filter to obtain a frosted texture coating liquid.

[0104] S2. Unwind the PET film substrate and put it on the machine. Apply the frosted coating liquid on the substrate by gravure coating. The coating amount is 8g / m 2The temperature settings of the five sections of the heating and drying oven are 130°C / 150°C / 180°C / 150°C / 100°C, respectively. After drying, the film is cured by UV irradiation, with the UV power turned on at 100% and the speed at 40 m / min. Finally, the matte texture film is rolled up.

[0105] The performance test results of the above embodiments and comparative examples are shown in Table 1 below.

[0106] Note: Sandy raised feeling level: + represents low, ++ represents relatively low, ++++ represents average, ++++++ represents very good, and ++++++++ represents excellent.

[0107] According to the test data results shown in Table 1, combined with the formulation design and process parameters, the following results can be obtained: Compared with Example 1, Example 2 increases the drying temperature while keeping the formula materials unchanged. By observing the change in the thickness of the dry film coating, it can be found that within a certain range, the higher the drying temperature, the greater the expansion multiple of the heat-expandable microspheres, which in turn leads to an increase in the dry film thickness, making the sandy touch more intense.

[0108] In Example 3, the model of the heat-expandable microspheres in Example 1 was adjusted to use the 043DU80 model with a larger particle size after expansion, and the drying temperature was increased accordingly. This change further increased the dry film thickness and made the sandy touch more obvious.

[0109] However, in Example 4, when the equipment operating speed is increased while keeping the formula material and drying temperature unchanged, that is, when the heating time in the drying unit is shortened, the final dry film thickness is reduced and the sandy touch is correspondingly weakened, reaching a level similar to that of Example 1.

[0110] Example 5 further explored the effect of the proportion of heat-expandable microspheres on the performance of the dry film. While keeping the drying temperature and the running speed unchanged, the mass of heat-expandable microspheres in the formula material was halved. The results showed that the sandy touch grade was reduced to average, but the particle spacing was significantly increased, and the glossiness of the dry film was also reduced.

[0111] In addition, two groups of comparative examples were set up for comparative analysis. In comparative example 1, although the formula materials were the same as those in Example 1, the drying unit was not turned on, resulting in a lower dry film coating thickness, which was similar to the initial particle size of the heat-expandable microspheres, so there was no obvious convex feeling. In comparative example 2, although the drying unit was turned on, the temperature was set too high, exceeding the theoretical maximum temperature of the heat-expandable microspheres, causing the microspheres to rupture during the expansion process, and the convex feeling became a pricking feeling, and the touch performance was average.

[0112] Based on the analysis of the above embodiments and comparative examples, it can be seen that embodiments 3 and 4 control the heating time of the heat-expandable microspheres by adjusting the operating speed of the equipment, thereby achieving a sandy feel with different protrusions and meeting the diverse needs of the market.

[0113] As can be seen from the foregoing, the present application provides a new frosted texture film and a preparation method thereof, wherein the frosted texture film is composed of a substrate layer and a frosted texture coating layer covered thereon, and the frosted texture coating layer is formed by photocuring a specific frosted coating liquid after heating. The frosted coating liquid mainly comprises a solvent-free curing composition and a frosted slurry, and heat-expandable microspheres are added to the frosted slurry. These microspheres expand when heated, thereby forming tiny protruding structures in the coating, giving the film material a unique frosted touch and visual effect.

[0114] The solvent-free curing composition consists of a solvent-free UV resin and a UV photoinitiator, which ensures the rapid and efficient curing of the coating while avoiding the environmental pollution problems that may be caused by traditional solvent-based resins. In addition to thermal expansion microspheres, additives such as fumed silica, silane coupling agents and wetting dispersants are added to the frosting slurry to further improve the hardness, wear resistance, leveling and glossiness of the coating, while ensuring the uniform distribution of each component in the coating.

[0115] The change in particle size of the heat-expandable microspheres before and after heating has been designed and controlled to ensure the formation of a fine, uniform frosted convex structure in the coating, which not only enhances the visual effect of the film material, but also improves the richness and layering of its touch. At the same time, by adjusting the mass fraction ratio of the solvent-free curing composition and the frosted slurry, as well as the type and quantity of the heat-expandable microspheres, the frosted texture film of this application can flexibly adapt to different application scenarios and customer needs.

[0116] The preparation method includes the steps of preparing a frosted coating liquid, applying the coating liquid on a substrate layer, heating the coating layer, and photocuring the coating layer after the heating treatment. Among them, the coating method is preferably gravure coating or slit coating in a roll-to-roll manner, and the curing method is carried out by ultraviolet light irradiation. By controlling parameters such as the coating amount, the number of coating roller lines, the coating environment, and the temperature of the coating liquid, and optimizing the UV curing conditions, the sandy touch and visual beauty are achieved at a lower coating amount, while also improving production efficiency and reducing production costs. The solvent-free system used in this application is environmentally friendly and the frosted texture film prepared has extremely low odor, which is in line with modern environmental protection concepts. Therefore, the frosted texture film and its preparation method of this application have broad application prospects and market competitiveness in related fields.

[0117] The above is only a specific implementation of the present application, and any other improvements made based on the concept of the present application are deemed to be within the protection scope of the present application.

Claims

1. A frosted texture film, characterized in that: It comprises a substrate layer (100) and a frosted texture coating (200) formed on the substrate layer (100), wherein the frosted texture coating (200) is formed by photocuring a frosted coating liquid after heating; The frosted coating liquid comprises the following components in mass fractions: 1-90 parts of a solvent-free curing composition and 1-90 parts of a frosted slurry; The frosting slurry includes heat-expandable microspheres (300).

2. The frosted texture film according to claim 1, characterized in that: The frosting slurry comprises the following components in parts by weight: 1-9 parts of heat-expandable microspheres (300), 0-6 parts of silicon dioxide, 0.1-1 parts of silane coupling agents, and 0.1-1 parts of wetting and dispersing agents.

3. The frosted texture film according to claim 1, characterized in that: The heat-expandable microspheres (300) are thermoplastic polymer microspheres, and the thermoplastic polymer is selected from one or a combination of acrylic resin, vinyl chloride, acrylonitrile resin, vinylidene chloride resin, polyamide, polycarbonate, polyethylene, polyimide, polyphenylene ether, and polypropylene.

4. The frosted texture film according to claim 3, characterized in that: The average particle size of the heat-expandable microspheres (300) before heating is in the range of 10-24 μm, and the average particle size after heating is in the range of 40-80 μm.

5. The frosted texture film according to claim 3, characterized in that: The heating temperature of the heat-expandable microspheres (300) is in the range of 70°C to 160°C.

6. The frosted texture film according to claim 1, characterized in that: The solvent-free curing composition comprises the following components in parts by mass: 20-40 parts of solvent-free UV resin and 0.5-2 parts of UV photoinitiator.

7. The frosted texture film according to claim 6, characterized in that: The solvent-free UV resin is one or a combination of polyurethane acrylate, polyester acrylate, epoxy acrylate, and silicon-modified acrylate, and the UV photoinitiator is one or a combination of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1-hydroxycyclohexyl phenyl ketone, and methyl benzoylformate.

8. The frosted texture film according to claim 1, characterized in that: The substrate layer (100) is one or a combination of PET, PP, NY, PE, PC, PS, and EVA.

9. A method for preparing a frosted texture film, characterized in that: include: Prepare frosted coating liquid; Applying the frosted coating liquid on the substrate layer (100); Heat treatment of the coating; After the heating treatment, light curing is performed to form a frosted texture coating (200); The frosted coating liquid comprises the following components in mass fractions: 1-90 parts of a solvent-free curing composition and 1-90 parts of a frosted slurry, wherein the frosted slurry comprises thermally expandable microspheres (300).

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