A UV transfer printing process for a high-wear matte-finish laptop frame

Abstract

This application relates to the field of surface treatment technology, and more specifically, to a UV transfer printing process for a high-wear-resistant matte-textured laptop frame. The process involves: 1) applying a wear-resistant UV double-curing adhesive to a laptop frame substrate, heating to remove the solvent, forming a pre-cured adhesive layer; 2) bonding a pre-formed matte-textured and electroplated transfer film to the pre-cured adhesive layer on the laptop frame substrate, followed by UV transfer, peeling, and then applying another layer of wear-resistant UV double-curing adhesive for curing, resulting in a high-wear-resistant matte-textured laptop frame. The wear-resistant UV double-curing adhesive is composed of the following raw materials by weight percentage: 3-8 parts functional dispersion; 30-40 parts polyurethane acrylate resin; 10-20 parts reactive diluent; 1-3 parts UV initiator; and 0.1-0.5 parts thermal initiator. This application offers advantages such as good transfer effect and wear resistance.

Description

Technical Field

[0001] This application relates to the field of surface treatment technology, and more specifically, it relates to a UV transfer process for a highly wear-resistant matte-textured laptop computer frame. Background Technology

[0002] In the field of printing technology, the manufacturing of laptop frames is crucial. As a core exterior component and protective structure of the device, the laptop frame not only needs excellent mechanical protection, but its surface finish also directly impacts the product's market competitiveness. With the development of personalized and high-end consumer electronics, frame designs that combine matte and metallic textures have become mainstream industry demands. This is significant for improving the overall quality and user experience of laptops, satisfying consumers' pursuit of high-quality, personalized electronic products. Moreover, in today's increasingly competitive market, an excellent frame design can help a product stand out and capture a larger market share.

[0003] Currently, the choice of materials for laptop frames mainly revolves around lightweight design, low cost, and ease of processing. Among these, plastic materials, due to their advantages of light weight, easy molding, and high cost-effectiveness, are widely used in laptop frame manufacturing. Commonly used plastic materials include polycarbonate (PC), polyethylene terephthalate (PET), and polymethyl methacrylate (PMMA). However, plastic materials themselves have a smooth surface and lack a metallic feel, failing to meet consumers' demands for a high-end appearance.

[0004] To address this issue, the industry typically employs two surface treatment processes to achieve a matte metallic finish on plastic frames. One is a surface coating process, which involves depositing a metallic coating on the plastic frame surface and then applying a matte finish to create a matte metallic texture. The other is a UV transfer process. This process first involves evenly coating the surface of the laptop's plastic frame with UV adhesive to form a UV adhesive layer. Then, a transfer film with a pre-made matte texture and electroplated finish (the UV texture transfer and electroplating are performed sequentially on a separate PET film, etc.) is tightly bonded to the UV adhesive layer. Finally, UV light is used to cure the UV adhesive, and the release layer of the electroplated transfer film is peeled off, thus giving the plastic frame a matte metallic finish.

[0005] However, existing processes have significant drawbacks. In surface coating processes, because the surface of plastic materials is non-polar or weakly polar, while the metal coating is strongly polar, the large difference in polarity between the two results in weak adhesion between the coating and the plastic substrate. This leads to unstable coating adhesion, easy peeling, and poor wear resistance. Furthermore, the uniformity of the matte finish during the coating process is difficult to control precisely, easily resulting in inconsistent surface gloss, localized bright or dark areas, affecting the consistency of the product's appearance.

[0006] While UV transfer printing can improve the adhesion between the decorative layer and the plastic substrate to some extent and alleviate the problem of easy plating peeling, the UV adhesive shrinks during curing. The shrinkage rate mismatch between the plastic substrate, the UV adhesive layer, and the electroplated transfer film leads to a decrease in the replication accuracy of the matte metallic texture during the transfer process. This results in a significant deviation between the matte metallic texture of the frame surface after transfer and the intended texture of the electroplated transfer film. Furthermore, the internal stress generated by shrinkage can further affect the bonding stability between the UV adhesive layer and the substrate and decorative layer, potentially leading to cracking, peeling, and decreased wear resistance of the decorative layer after long-term use. In short, current technology struggles to simultaneously achieve a matte metallic finish on plastic laptop frames, maintain the bonding stability between the decorative layer and the substrate, and ensure adequate wear resistance. Summary of the Invention

[0007] The purpose of this application is to avoid a significant deviation between the matte metallic texture of the outer frame surface after UV transfer and the preset texture of the electroplated transfer film, and to reduce the possibility of detachment after long-term use, thereby providing a UV transfer process for a high-wear-resistant matte texture laptop outer frame.

[0008] A UV transfer printing process for a highly wear-resistant matte-textured laptop frame is achieved through the following method: 1) Apply wear-resistant UV double-curing adhesive to the outer frame substrate of the laptop computer, heat to remove the solvent, and form a pre-cured adhesive layer; 2) The pre-made matte textured transfer film and electroplated transfer film are bonded to the pre-cured adhesive layer on the laptop frame substrate, and then UV transfer is performed. After peeling, wear-resistant UV double-curing adhesive is applied and cured to obtain a highly wear-resistant matte textured laptop frame. The wear-resistant UV dual-curing adhesive is composed of the following raw materials by weight percentage: 3-8 parts of functional dispersion; 30-40 parts of polyurethane acrylate resin; 10-20 parts of reactive diluent; 1-3 parts of UV initiator; 0.1-0.5 parts of thermal initiator; The functional additive is composed of 3-8 parts of a functional dispersion, 2-5 parts of acryloyloxyfunctionalized oligosiloxane, and 1-5 parts of 1,1,3,3-tetramethyl-1,3-divinylsilazane. The functional dispersion is obtained by dispersing the functional monomer in a solvent. The functional monomer is one or more of acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane, methacryloyloxyethyl trimellitic anhydride, and bis(methacryloyloxyethyl)pyromellitic dianhydride, and at least one of them is acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane.

[0009] The technical solution of this application, from a process perspective, involves applying a wear-resistant UV dual-curing adhesive and then heating to remove the solvent to form a pre-cured adhesive layer. This avoids solvent residue affecting the matte metallic texture after transfer, ensuring that the final product's texture is highly consistent with the preset effect of the transfer film, with uniform gloss and clear texture. It also prevents adhesive layer displacement and wrinkles during bonding, reducing the risk of decorative layer detachment. The UV transfer and peeling operations can accurately replicate the matte texture of the electroplated transfer film. The process is simple, highly controllable, improves production efficiency, reduces costs, and is suitable for mass production.

[0010] From a raw material perspective, polyurethane acrylate resin can bond well with the substrate, improving the wear resistance of the frame surface; reactive diluents can adjust viscosity, reduce curing shrinkage, and improve the density and adhesion of the adhesive layer; UV initiators and thermal initiators work synergistically to achieve dual curing, strengthening the adhesion between the adhesive layer and the substrate and decorative layer, and improving the hardness and wear resistance of the adhesive layer; functional dispersions ensure uniform dispersion of each component, providing a good environment for synergistic reactions; acryloyloxyfunctionalized oligosiloxanes improve the density and flexibility of the adhesive layer, forming a wear-resistant layer, improving wear resistance and stain resistance, and optimizing the matte metallic texture; 1,1,3,3-tetramethyl-1,3-diethylenesilazane improves the adhesion between the adhesive layer and the substrate and optimizes the leveling properties of the adhesive layer; functional monomers enhance the performance of the adhesive layer and the transfer texture, giving the frame both a delicate matte texture and a full metallic sheen. Overall, this process achieves the advantages of excellent and stable texture, strong adhesion that is not easy to peel off, and outstanding wear resistance.

[0011] Preferably, the temperature for heating to remove the solvent in step 1) is above 80°C and the time is within 10 minutes.

[0012] It can ensure that a large amount of solvent is removed, avoid excessive decomposition of thermal initiator leading to cross-linking or copolymerization of a large number of monomers, and prevent excessive reaction from affecting the stability of the electroplated layer on the laptop frame.

[0013] Preferably, the transfer conditions in step 2) are:

[0014] Under these transfer conditions, the electroplated layer can be tightly and stably bonded to the pre-cured adhesive layer on the surface of the laptop frame. Furthermore, the pre-cured adhesive layer further cures, ensuring stable adhesion between the electroplated layer and the laptop frame surface, preventing detachment or wear during later use. Simultaneously, the solution described in claim 1 avoids the defects of existing processes, guaranteeing transfer effect and bonding stability. Laptop frames treated with this process can accurately replicate the matte texture of the electroplated transfer film, exhibiting excellent and stable texture, strong adhesion, resistance to detachment, and outstanding wear resistance.

[0015] Preferably, the functional monomer is composed of acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane, methacryloyloxyethyl trimellitic anhydride, and di(methacryloyloxyethyl)pyromellitic dianhydride in a weight ratio of 1:(0.5-0.8):(0.2-0.5).

[0016] A wear-resistant UV dual-curing adhesive is applied to the outer frame substrate of a laptop computer. Heating removes the solvent, forming a pre-cured adhesive layer. This prevents solvent evaporation from affecting the matte metallic texture after transfer, ensures tight adhesion, and reduces the risk of decorative layer detachment. An electroplated transfer film is then bonded to the pre-cured adhesive layer for UV transfer, allowing for precise texture replication. The process is simple, highly controllable, and improves production efficiency while reducing costs. The components of the wear-resistant UV dual-curing adhesive work synergistically: polyurethane acrylate resin enhances wear resistance; reactive diluents reduce curing shrinkage and improve density and adhesion; and UV and thermal initiators achieve dual curing effects. Functional additives ensure uniform dispersion of components, improving the adhesive layer's density, flexibility, wear resistance, and stain resistance, while optimizing leveling and bonding. Functional monomers enhance the adhesive layer's performance and the transferred texture.

[0017] Based on this, acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane, methacryloyloxyethyl trimellitic anhydride, and bis(methacryloyloxyethyl)pyromellitic anhydride are compounded in a specific weight ratio to achieve a synergistic effect, further improving the overall performance. This makes the surface texture and matte effect formed after transfer very close, and the adhesion on the substrate is stable, avoiding wear and tear on the outer frame during use, thus improving its practicality and production quality.

[0018] Preferably, the solvent is ethyl acetate and / or butyl acetate.

[0019] This process combines coating a wear-resistant UV dual-curing adhesive onto a laptop frame substrate, heating to remove solvent to form a pre-cured adhesive layer, bonding the pre-cured adhesive layer with transfer effect and high wear resistance to perform UV transfer printing, and then peeling off the release film. It also utilizes a wear-resistant UV dual-curing adhesive composed of functional dispersion, polyurethane acrylate resin, reactive diluent, UV initiator, and thermal initiator, along with appropriate proportions of functional additives and monomers. The use of ethyl acetate and / or butyl acetate as solvents ensures complete solvent evaporation during the heating solvent removal step, leaving no residue that could affect subsequent performance. This guarantees that the final laptop frame possesses both excellent and stable high-gloss and matte composite metallic texture, strong adhesion, and outstanding wear resistance.

[0020] Preferably, the activating diluent is one or a combination of more than one of tripropylene glycol diacrylate, 1,6-hexanediol diacrylate, pentaerythritol triacrylate, and N-vinylcaprolactam.

[0021] The activating diluent not only adjusts the viscosity of the adhesive, making it easier to coat evenly, but its active groups can also undergo cross-linking reactions with the active groups of polyurethane acrylate resin and other components during UV curing and heat curing, forming a dense three-dimensional cross-linked network. This effectively reduces volume shrinkage during the adhesive curing process, solving the problems of transfer texture deviation and adhesive layer cracking caused by curing shrinkage in existing UV transfer printing processes, while further improving the density and adhesion of the adhesive layer.

[0022] Preferably, the UV initiator is one or a combination of more than one of 2-hydroxy-2-methyl-1-phenylpropanone, 1-hydroxycyclohexylphenyl ketone, 2-methyl-2-(4-morpholino)-1-[4-(methylthio)phenyl]-1-propanone, 2,4,6-trimethylbenzoyl diphenylphosphine oxide, and bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide.

[0023] A wear-resistant UV dual-curing adhesive, composed of functional dispersion, polyurethane acrylate resin, reactive diluent, UV initiator, and thermal initiator, is coated onto the laptop's outer frame substrate. Heating removes the solvent, forming a pre-cured adhesive layer. This prevents solvent evaporation from affecting the matte metallic texture after transfer, ensures tight adhesion, and reduces the risk of decorative layer detachment. The UV initiator and thermal initiator work synergistically to achieve a dual-curing effect. During the solvent removal process, the thermal initiator promotes the thermal curing of some components to form a pre-cured adhesive layer. 2-hydroxy-2-methyl-1-benzene is selected as the pre-cured adhesive layer. One or more of the following can be used as UV initiators: acetone, 1-hydroxycyclohexylphenyl ketone, 2-methyl-2-(4-morpholino)-1-[4-(methylthio)phenyl]-1-propanone, 2,4,6-trimethylbenzoyl diphenylphosphine oxide, and bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide. These can promote the complete curing of the adhesive under UV irradiation, further strengthening the adhesion between the adhesive layer and the substrate and decorative layer, improving the hardness and wear resistance of the adhesive layer, and preventing the decorative layer from peeling off and the adhesive layer from breaking during long-term use.

[0024] Preferably, the thermal initiator is one or a combination of multiple of benzoyl peroxide, azobisisobutyronitrile, dicumyl peroxide, cumyl hydroperoxide, and azobisisoheptanenitrile.

[0025] In the UV transfer printing process for high-wear-resistant matte laptop frames, one or more of the following are selected as thermal initiators: benzoyl peroxide, azobisisobutyronitrile, dicumyl peroxide, cumyl hydroperoxide, and azobisisoheptanenitrile. These initiators work synergistically with the UV initiator to achieve a dual curing effect of "thermal pre-curing + UV complete curing." The thermal initiator is activated during the solvent removal process in step 1), causing some components to undergo a thermal curing reaction, forming a stable pre-cured adhesive layer. This creates favorable conditions for subsequent bonding with the transferred electroplated film. In step 2), under UV irradiation, the UV initiator is activated, driving the adhesive to complete complete curing. This further strengthens the adhesion between the adhesive layer and the substrate and decorative layer, improves the hardness and wear resistance of the adhesive layer, and prevents the decorative layer from peeling off and the adhesive layer from breaking during long-term use.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. In terms of process, after applying wear-resistant UV double-curing adhesive to the laptop's outer frame substrate, the solvent is removed by heating to form a pre-cured adhesive layer. This completely eliminates the risk of solvent residue and prevents bubbles and uneven surfaces caused by solvent evaporation during subsequent UV transfer and curing. It ensures that the matte metallic texture of the final product is highly consistent with the preset effect of the electroplating transfer film, with uniform gloss and clear texture. At the same time, the appropriate adhesion and hardness of the pre-cured adhesive layer can prevent the adhesive layer from shifting and wrinkling when bonding the electroplating transfer film, ensuring a tight bond and reducing the risk of decorative layer peeling off from the source. 2. The UV transfer and peeling operation utilizes the stability of the pre-cured adhesive layer to accurately replicate the matte texture of the electroplated transfer film. The process is simple and highly controllable. Compared with traditional coating processes, it does not require complex equipment and post-processing steps, which can significantly improve production efficiency, reduce production costs, and ensure high product appearance consistency, making it suitable for large-scale mass production. 3. The wear-resistant UV dual-curing adhesive features a scientifically formulated composition with significant synergistic effects, effectively addressing issues such as curing shrinkage and weak adhesion, while enhancing wear resistance. Polyurethane acrylate resin serves as the core film-forming component, improving the wear resistance of the outer frame surface; reactive diluents adjust viscosity and reduce curing shrinkage, enhancing the density and adhesion of the adhesive layer; UV initiators and thermal initiators work synergistically to achieve dual curing, strengthening the adhesive layer's bonding strength, hardness, and wear resistance; functional additives optimize adhesive layer performance, improve transfer effects, and enhance anti-detachment and wear resistance; functional monomers synergistically strengthen adhesive layer performance and transfer texture, resulting in a product with excellent and stable texture, strong adhesion, resistance to detachment, and outstanding wear resistance. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the embodiments.

[0028] Acryloyloxyfunctionalized oligosiloxane: Crosile 7270; The molecular structure of 1,1,3,3-tetramethyl-1,3-divinylsilazane is as follows; ; Polyurethane acrylate resin, Zhanxin EBECRYL8213; The molecular structure of acryloyloxypropyl-glycidyl oxypropyl cage-type polysilsesquioxane is as follows: ; The molecular structure of methacryloyloxyethyl trimellitic anhydride is as follows: ; The molecular structure of bis(methacryloyloxyethyl)pyromellitic anhydride is as follows: .

[0029] Preparation Example 1 A wear-resistant UV dual-curing adhesive is obtained by the following method: Functional dispersion: 10 parts by weight of functional monomer (acryloyloxypropyl-glycidoxypropyl cage polysilsesquioxane) are completely dissolved in 10 parts by weight of solvent (ethyl acetate) to obtain functional dispersion.

[0030] Functional additives: Weigh 5 parts of functional dispersion, 3 parts of acryloyloxyfunctionalized oligosiloxane, and 2 parts of 1,1,3,3-tetramethyl-1,3-divinylsilazane by weight and mix them evenly to obtain functional additives.

[0031] Weigh out 35 parts by weight of polyurethane acrylate resin, 18 parts by weight of reactive diluent, 2 parts by weight of UV initiator, 0.2 parts by weight of thermal initiator, and 5 parts by weight of functional additives and put them into a mixing device. Stir at 100 r / min for 20 min to ensure that the mixture is fully homogeneous and wear-resistant UV dual-curing adhesive.

[0032] The activating diluent is composed of tripropylene glycol diacrylate, 1,6-hexanediol diacrylate, pentaerythritol triacrylate, and N-vinylcaprolactam in a weight ratio of 1:0.2:0.3:0.5.

[0033] The UV initiator is composed of 2-hydroxy-2-methyl-1-phenylpropanone (photoinitiator 1173), 1-hydroxycyclohexylphenyl methyl ketone (photoinitiator 184), and 2,4,6-trimethylbenzoyl diphenylphosphine oxide (photoinitiator TPO) in a weight ratio of 1:0.5:0.5.

[0034] The thermal initiator is composed of benzoyl peroxide and azobisisobutyronitrile in a weight ratio of 3:1.

[0035] Preparation Example 2 The difference between Preparation Example 2 and Preparation Example 1 lies in the amount of raw materials used, as detailed below: Functional additives: Weigh 3 parts of functional dispersion, 5 parts of acryloyloxyfunctionalized oligosiloxane, and 1 part of 1,1,3,3-tetramethyl-1,3-divinylsilazane by weight and mix them evenly to obtain functional additives.

[0036] By weight, the composition includes 30 parts polyurethane acrylate resin, 10 parts reactive diluent, 1 part UV initiator, 0.5 parts thermal initiator, and 8 parts functional additives.

[0037] Preparation Example 3 The difference between Preparation Example 3 and Preparation Example 1 lies in the amount of raw materials used, as detailed below: Functional additives: Weigh 8 parts of functional dispersion, 6 parts of acryloyloxyfunctionalized oligosiloxane, and 2 parts of 1,1,3,3-tetramethyl-1,3-divinylsilazane by weight and mix them evenly to obtain functional additives.

[0038] Weigh out 40 parts by weight of polyurethane acrylate resin, 20 parts by weight of reactive diluent, 3 parts by weight of UV initiator, 0.1 parts by weight of thermal initiator, and 3 parts by weight of functional additives.

[0039] Preparation Example 4 The difference between Preparation Example 4 and Preparation Example 1 is that the functional monomer is composed of acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane and methacryloyloxyethyl trimellitic anhydride in a weight ratio of 1:1.

[0040] Preparation Example 5 The difference between Preparation Example 5 and Preparation Example 1 is that the functional monomer is composed of acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane and bis(methacryloyloxyethyl)pyromellitic dianhydride in a weight ratio of 1:1.

[0041] Preparation Example 6 The difference between Preparation Example 6 and Preparation Example 1 is that the functional monomer is composed of acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane, methacryloyloxyethyl trimellitic anhydride, and di(methacryloyloxyethyl)pyromellitic dianhydride in a weight ratio of 1:0.5:0.5.

[0042] Preparation Example 7 The difference between Preparation Example 7 and Preparation Example 1 is that the functional monomer is composed of acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane, methacryloyloxyethyl trimellitic anhydride, and di(methacryloyloxyethyl)pyromellitic dianhydride in a weight ratio of 1:0.6:0.4.

[0043] Preparation Example 8 The difference between Preparation Example 8 and Preparation Example 1 is that the functional monomer is composed of acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane, methacryloyloxyethyl trimellitic anhydride, and di(methacryloyloxyethyl)pyromellitic dianhydride in a weight ratio of 1:0.8:0.2.

[0044] Preparation of comparative examples The difference between Comparative Example 1 and Preparation Example 1 is that the functional dispersion was replaced with an equal amount of acryloyloxyfunctionalized oligosiloxane.

[0045] The difference between Comparative Example 2 and Preparation Example 1 is that the acryloyloxyfunctionalized oligosiloxane is replaced by an equal amount of 1,1,3,3-tetramethyl-1,3-divinylsilazane.

[0046] The difference between Comparative Example 3 and Preparation Example 1 is that 1,1,3,3-tetramethyl-1,3-diethylenesilazane is replaced in equal amounts with acryloyloxyfunctionalized oligosiloxane.

[0047] The difference between Comparative Example 4 and Example 1 is that the functional monomer is the dual-terminated silane coupling agent KH550.

[0048] The difference between Comparative Example 5 and Example 1 is that the functional additives were replaced with an active diluent in equal amounts. Example

[0049] Example 1 A UV transfer printing process for a highly wear-resistant matte-textured laptop frame is achieved through the following method: 1) Apply abrasion-resistant UV double-curing adhesive to the laptop's outer frame substrate, with a coating amount of 20g / m². 2 Then it enters the curing device, and under vacuum conditions, with a vacuum degree of -0.01MPa, it is heated to 100℃ and kept at that temperature for 5 minutes. At this time, the solvent (ethyl acetate) is completely removed, and a pre-cured adhesive layer is formed on the surface of the laptop computer's outer frame substrate. 2) The pre-prepared matte textured and electroplated transfer film (matte textured PET electroplated film, gloss level 28%, test angle 60°, electroplated silver layer with an average thickness of 2 micrometers) is bonded to one side of the pre-cured adhesive layer on the laptop's outer frame substrate. Under an inert atmosphere, the transfer roller temperature is 75℃, the transfer pressure is 0.5MPa, the transfer contact time is 30s, and the wavelength is 365nm; the curing energy is 1200mJ / cm, the light intensity is 300mW / cm², and then UV transfer is performed. After drying in a 130℃ oven for 2 minutes and cooling to 30℃, the release film (PET film) of the electroplated transfer film is peeled off. Then, a wear-resistant UV double-curing adhesive is applied to the electroplated layer at a coating amount of 20g / m². 2Then it enters the dual device of heat curing and UV curing. Under vacuum conditions, vacuum degree -0.01MPa, negative pressure, temperature 100℃, time 5min, wavelength 365nm; curing energy 1200mJ / cm, light intensity 300mW / cm², curing, a wear-resistant layer is formed on the electroplated layer, resulting in a highly wear-resistant matte textured laptop frame.

[0050] Examples 2-8 The difference between Examples 2-8 and Example 1 lies in the source of the wear-resistant UV dual-curing adhesive, as detailed below: Table 1. Sources of the abrasion-resistant UV dual-curing adhesives in Examples 1-8

[0051] Comparative Example Comparative Examples 1-5 The difference between Comparative Examples 1-5 and Example 1 is that the source of the wear-resistant UV dual-curing adhesive is different, as shown in Table 2 below; Table 2 shows the sources of the abrasion-resistant UV dual-curing adhesives used in Comparative Examples 1-5.

[0052] Comparative Example 6 The difference between Comparative Example 6 and Example 1 is that no pre-curing is performed. The specific process is as follows: Abrasion-resistant UV dual-curing adhesive is applied to the laptop's outer frame substrate at a coating weight of 20 g / m². 2 Under vacuum conditions (vacuum degree -0.01MPa, negative pressure, temperature 100℃, time 5min, wavelength 365nm), curing energy 1200mJ / cm, light intensity 300mW / cm², a cured adhesive layer is formed on the surface of the laptop's outer frame substrate. 2) The pre-prepared matte textured and electroplated transfer film (matte textured PET electroplated film, gloss level 28%, test angle 60°, electroplated silver layer with an average thickness of 2 micrometers) is bonded to one side of the cured adhesive layer on the laptop's outer frame substrate. Under an inert atmosphere, the transfer roller temperature is 75℃, the transfer pressure is 0.5MPa, the transfer contact time is 30s, and the wavelength is 365nm; the curing energy is 1200mJ / cm, and the light intensity is 300mW / cm², followed by UV transfer. Then, it is dried in a 130℃ oven for 2 minutes. After cooling to 30℃, the release film (PET film) of the electroplated transfer film is peeled off, and then abrasion-resistant UV double-curing adhesive is applied to the electroplated layer at a coating amount of 20g / m². 2Then it enters the dual device of heat curing and UV curing. Under vacuum conditions, vacuum degree -0.01MPa, negative pressure, temperature 100℃, time 5min, wavelength 365nm; curing energy 1200mJ / cm, light intensity 300mW / cm², curing, a wear-resistant layer is formed on the electroplated layer, resulting in a highly wear-resistant matte textured laptop frame.

[0053] Performance testing Experiment 1: Gloss Measurement Testing standards and conditions: The test shall be conducted in accordance with the national standard GB / T 9754-2025 Determination of specular gloss at 20°, 60° and 85° for paints and varnishes without metallic pigments, with the measurement angle set at 60°.

[0054] Test subject: The gloss of the transfer layer surface of the high wear-resistant matte textured laptop frame samples prepared in Examples 1-8 and Comparative Examples 1-6 was measured. When the gloss was in the range of 25-30, it was recorded as qualified.

[0055] Data processing: Calculate the rate of change of coating relative to gloss, using the following formula: Gloss change rate (%) = |G1-G0| / G1×100% In the formula: G1 is the gloss of the transfer film that has been pre-made with a matte texture and electroplated; G0 is the surface gloss measurement value of Examples 1-8 and Comparative Examples 1-6.

[0056] Experiment 2: Texture effect after transfer For changes in appearance and texture, the texture of the transfer layer on the surface of the high wear-resistant matte textured laptop frame prepared in Examples 1-8 and Comparative Examples 1-6, and the relative deviation of the surface texture from the original master film (the transfer film that has been pre-made into a matte texture and completed electroplating) in terms of macroscopic morphology, microscopic geometric features (such as depth and spacing) and two-dimensional distribution pattern, are all controlled within ±5%, and are considered qualified.

[0057] Experiment 3: Wear Resistance 3-1. Abrasion resistance: Refer to GB / T5237-2008, use the sand drop method, and record the time it takes for the bottom to penetrate. If the penetration time is greater than 120 minutes, it is considered qualified.

[0058] 3-2. Durability: The high wear-resistant matte laptop frames prepared in Examples 1-8 and Comparative Examples 1-6 were placed in a double 85% (humidity 85% temperature 85℃) aging chamber for 1000 hours. After being removed, they were placed at 50% humidity and 28℃ for 24 hours. The wear resistance was then tested using the method in 3-1. The time when the bottom showed through was recorded, and the bottom showing time retention rate before and after aging was calculated.

[0059] Table 3. Experimental data of Examples 1-8 and Comparative Examples 1-6

[0060] The experimental data above show that the functional additive used in this application is composed of 3-8 parts of functional dispersion, 2-5 parts of acryloyloxyfunctionalized oligosiloxane, and 1-5 parts of 1,1,3,3-tetramethyl-1,3-divinylsilazane; and the functional dispersion is obtained by dispersing the functional monomer in a solvent, wherein the functional monomer is one or more of acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane, methacryloyloxyethyl trimellitic anhydride, and bis(methacryloyloxyethyl)pyromellitic dianhydride. The compound, at least one of which is acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane, has a final gloss level within 25-30%, a small gloss change rate, a small difference in texture effect after transfer (deviation within ±5%), good abrasion resistance (transparency time of more than 120 minutes), and a transparency retention rate of more than 90% after double 85 test. Therefore, compared with comparative examples 1-6, it is better in terms of matte effect retention, adhesion stability and abrasion resistance, further improving its practicality.

[0061] This specific embodiment is merely an explanation of this application and is not intended to limit it. Those skilled in the art, after reading this specification, may make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A UV transfer printing process for a high-wear-resistant matte-textured laptop frame, characterized in that, It is obtained by the following method: 1) Apply wear-resistant UV double-curing adhesive to the outer frame substrate of the laptop computer, heat to remove the solvent, and form a pre-cured adhesive layer; 2) The pre-made matte textured transfer film and electroplated transfer film are bonded to the pre-cured adhesive layer on the laptop frame substrate, and then UV transfer is performed. After peeling, wear-resistant UV double-curing adhesive is applied and cured to obtain a highly wear-resistant matte textured laptop frame. The wear-resistant UV dual-curing adhesive is composed of the following raw materials by weight percentage: 3-8 parts of functional dispersion; 30-40 parts of polyurethane acrylate resin; 10-20 parts of reactive diluent; 1-3 parts of UV initiator; 0.1-0.5 parts of thermal initiator; The functional additive is composed of 3-8 parts of a functional dispersion, 2-5 parts of acryloyloxyfunctionalized oligosiloxane, and 1-5 parts of 1,1,3,3-tetramethyl-1,3-divinylsilazane. The functional dispersion is obtained by dispersing the functional monomer in a solvent. The functional monomer is one or more of acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane, methacryloyloxyethyl trimellitic anhydride, and bis(methacryloyloxyethyl)pyromellitic dianhydride, and at least one of them is acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane.

2. The UV transfer printing process for a high-wear-resistant matte-textured laptop frame according to claim 1, characterized in that: In step 1), the temperature for heating to remove the solvent is above 80°C and the time is within 10 minutes.

3. The UV transfer printing process for a high-wear-resistant matte-textured laptop frame according to claim 1, characterized in that, The UV transfer conditions in step 2) are as follows: under an inert atmosphere, the transfer roller temperature is 60℃-75℃, the transfer pressure is 0.3MPa-0.6MPa, the transfer contact time is less than 30s, and the wavelength is 365nm-395nm; the curing energy is 800-1500 mJ / cm², and the light intensity is 200-400mW / cm². According to claim 1, the UV transfer printing process for a high wear-resistant matte textured laptop frame is characterized in that: the functional monomer is composed of acryloyloxypropyl-glycidyloxypropyl cage-type polysilsesquioxane, methacryloyloxyethyl trimellitic anhydride, and di(methacryloyloxyethyl)pyromellitic dianhydride in a weight ratio of 1:(0.5-0.8):(0.2-0.5).

4. The UV transfer printing process for a high-wear-resistant matte-textured laptop frame according to claim 1, characterized in that: The solvent is ethyl acetate and / or butyl acetate.

5. The UV transfer printing process for a high-wear-resistant matte textured laptop frame according to claim 1, characterized in that: The activating diluent is one or a combination of more than one of the following: tripropylene glycol diacrylate, 1,6-hexanediol diacrylate, pentaerythritol triacrylate, and N-vinylcaprolactam.

6. The UV transfer printing process for a high-wear-resistant matte textured laptop frame according to claim 1, characterized in that: The UV initiator is one or a combination of more of the following: 2-hydroxy-2-methyl-1-phenylpropanone, 1-hydroxycyclohexylphenyl ketone, 2-methyl-2-(4-morpholino)-1-[4-(methylthio)phenyl]-1-propanone, 2,4,6-trimethylbenzoyl diphenylphosphine oxide, and bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide.

7. The UV transfer printing process for a high-wear-resistant matte textured laptop frame according to claim 1, characterized in that: The thermal initiator is one or a combination of multiple of benzoyl peroxide, azobisisobutyronitrile, diisopropylbenzene peroxide, cumene hydroperoxide, and azobisisoheptanenitrile.

Images