Multi-layer film and preparation method of multi-layer film for in-mold transfer printing with surface touch feeling

Abstract

The multi-layer film and a method for preparing a multi-layer film for in-mold transfer with surface touch feeling, which can be used for surface decoration of durable molding parts such as automotive interiors. It includes a surface protection film, an anchoring ink-absorbing layer, a first touch support layer, a second touch support layer, an adhesive layer, a pattern layer, an anchoring ink-absorbing layer, and an ABS film stacked together in sequence; this multi-layer film can be used in automotive interiors and is applicable to the INS processing technology. The touch feeling on the surface of the multi-layer film is obvious before and after processing, and the touch feeling is not weakened significantly during the injection molding process. The multi-layer touch feeling layer used in the present invention enables the surface topography of the workpiece to be more easily maintained during the injection molding process compared to touch feeling ink and embossed touch feeling, and at the same time, the touch feeling layer in the film can ensure that the weather resistance of the overall film is more excellent than that of touch feeling ink and embossed touch feeling, and can be maintained for a long time.

Description

Technical Field

[0001] The present invention relates to a multilayer film and a method for preparing the same, and in particular to a multilayer film, a multilayer film having a surface touch feeling, and a method for manufacturing a multilayer film for in-mold transfer printing. Background Art

[0002] With the development of society, a large number of plastic parts are used in components such as household appliances, automobiles, and mobile phones. Decorating the surface of plastic parts with a formed film sheet having a surface touch feeling effect can exhibit a high-quality decorative effect and meet the needs of high-grade decoration, especially the needs of automotive interior parts having a three-dimensional structure with high stretchability.

[0003] At present, one type of well-known multilayer film with a surface touch feeling is to perform embossing treatment on the surface of an acrylic resin film, or to print a touch feeling coating on the surface of an acrylic resin layer and print a touch feeling coating during the pattern printing process so that the composite multilayer film presents a surface touch feeling effect after lamination.

[0004] However, for the film sheet subjected to touch feeling treatment by the embossing treatment method, during the injection molding process, due to the relatively large injection pressure in the injection process, the touch feeling will be eliminated. The greater the injection pressure, the more obvious the trend of the apparent touch feeling of the molded body being eliminated.

[0005] When printing a touch feeling layer on the surface of an acrylic resin layer, during the injection molding process, the touch feeling layer will be peeled off under the injection pressure.

[0006] When printing a touch feeling coating on the pattern layer, during the lamination process, due to the coating of the inner printed touch feeling layer causing the film to be uneven in appearance, there will be problems such as lamination blistering and uneven lamination during the lamination process. At the same time, the greater the lamination pressure, the more likely the surface topography of the lamination is to be eliminated.

[0007] Therefore, a new method for manufacturing an apparent touch feeling is needed. Through the multilayer film manufactured by this method, while ensuring the existing injection molding process remains unchanged, it also has a stable surface touch feeling presentation.

[0008] Compared with the coating structure and processing technology used in CN102555652A, which is a hot stamping technology and is not applicable to the forming process in the automotive field, and its weather resistance is relatively poor.

[0009] Compared with CN214083561U, which uses a PET substrate, the PET substrate is prone to cracking during the automotive INS forming process and is not applicable to workpieces with relatively complex structures; secondly, a single acrylic photocurable touch feeling coating is used, and the lack of an effective support layer will cause the problem of a significant decrease in touch feeling during the processing. Summary of the Invention

[0010] The problem to be solved by the present invention is to provide a multi-layer film and a manufacturing method thereof in view of the deficiencies of the existing technology. The multi-layer film can be used for surface decoration of durable formed parts such as automotive interiors. The technical solution is as follows:

[0011] A multi-layer film, characterized in that it includes a surface protection film, an anchoring and ink-absorbing layer, a first tactile support layer, a second tactile support layer, an adhesive layer, a pattern layer, an anchoring and ink-absorbing layer, and an ABS film, which are sequentially laminated together. The above-mentioned surface protection film, anchoring and ink-absorbing layer, tactile support layer, and tactile support layer constitute a tactile formation layer; the pattern layer, anchoring and ink-absorbing layer, and ABS film constitute an ink pattern film.

[0012] The present invention also discloses a manufacturing method of a multi-layer film for in-mold transfer, including the following steps:

[0013] Step 1, form an anchoring and ink-absorbing layer on the surface of the surface protection film;

[0014] Step 2, form a tactile support layer on the anchoring and ink-absorbing layer formed in Step 1;

[0015] Step 3, form a tactile support layer on the anchoring and ink-absorbing layer formed in Step 1;

[0016] Step 4, print an anchoring and ink-absorbing layer on the surface of the ABS film;

[0017] Step 5, form a pattern layer on the surface of the anchoring and ink-absorbing layer;

[0018] The above-mentioned pattern layer, anchoring and ink-absorbing layer, and ABS film constitute an ink pattern film.

[0019] Step 6, use an on-line coating and laminating machine to form an adhesive layer on the surface of the pattern layer, and at the same time use an on-line laminating machine to thermally laminate the tactile formation layer and the ink pattern film together online, and form a surface tactile pattern through a molding roller; then, after passing through a nitrogen environment and curing with a UV lamp, a multi-layer film with a tactile feeling is formed.

[0020] In the above multi-layer film, the surface protection film can be composed of PMMA, PC or PP film, and its thickness is 60-125 μm.

[0021] According to an embodiment of the present disclosure, the thickness of the anchoring and ink-absorbing layer is 0.5-2 μm.

[0022] According to an embodiment of the present disclosure, the thickness of the first tactile support layer is 25-40 μm.

[0023] According to an embodiment of the present disclosure, the thickness of the second tactile support layer is 10-15 μm.

[0024] According to an embodiment of the present disclosure, the thickness of the adhesive layer is 8-20 μm.

[0025] According to an embodiment of the present disclosure, the thickness of the ink pattern layer is 3-15 μm.

[0026] According to an embodiment of the present disclosure, the thickness of the anchoring ink-absorbing layer is 0.5-2 μm.

[0027] According to an embodiment of the present disclosure, the thickness of the ABS film is 250-500 μm.

[0028] The present invention also discloses a method for manufacturing a multi-layer film with a surface touch feeling, which is characterized in that:

[0029] Step 1: First, corona-treat the surface of a surface protection film, print an anchoring ink-absorbing layer on the corona-treated side, coat a touch support layer on the surface of the anchoring ink-absorbing layer, and then coat a second touch support layer on the surface of the first touch support layer, so as to form a touch formation layer together.

[0030] Step 2: Use a printing device to sequentially print an anchoring ink-absorbing layer 7 and a pattern layer on one side of the ABS film. The pattern can be one layer or multiple layers. The above pattern layer, anchoring ink-absorbing layer 7 and ABS film form an ink pattern film.

[0031] Step 3: Use an on-line coating compounding machine to on-line coat an adhesive layer on the side of the pattern layer in the ink pattern film. After drying, it is thermally pressed and compounded with the ink pattern film, and then cured by a UV lamp with a radiation dose of 80-150 mJ / cm2 in a nitrogen environment to form a multi-layer film with a touch feeling.

[0032] Step 4: Put this multi-layer film into a molding injection machine for injection molding to obtain a final injection-molded workpiece. At the same time, due to the touch support layer, this workpiece has an obvious and stable surface touch feeling.

[0033] Advantageous effects:

[0034] The multi-layer touch layer used in the present invention makes the surface topography of the workpiece during the injection molding process easier to maintain compared with touch ink and embossed touch, and at the same time, the touch layer in the film can ensure that the weather resistance of the overall film is more excellent than that of touch ink and embossed touch, and can be maintained for a long time. Description of the drawings

[0035] The following will explain various aspects of the present disclosure in more detail in conjunction with the advantageous embodiments of the present disclosure and with reference to the drawings, in which:

[0036] Figure 1Schematic diagram of a multi-layer film 100 with surface tactile sensation according to an embodiment of the present disclosure;

[0037] Figure 2 Schematic diagram of the tactile formation layer 10 according to an embodiment of the present disclosure;

[0038] Figure 3 Schematic diagram of the ink pattern film 20 according to an embodiment of the present disclosure;

[0039] Figure 4 Schematic diagram of the ink pattern film 20 with the adhesive layer 5 thereon according to an embodiment of the present disclosure;

[0040] Figure 5 Schematic diagram of the final formed workpiece 200 formed by a multi-layer film with surface tactile sensation according to an embodiment of the present disclosure.

[0041] 1 is the surface protection film

[0042] 2 is the anchoring ink absorption layer

[0043] 3 is the first tactile support layer

[0044] 4 is the second tactile support layer

[0045] 5 is the adhesive layer

[0046] 6 is the pattern layer

[0047] 7 is the anchoring ink absorption layer

[0048] 8 is the ABS film

[0049] 9 is the plastic workpiece

[0050] 10 is the tactile formation layer

[0051] 20 is the ink pattern film

[0052] 100 is the multi-layer film with surface tactile sensation

[0053] 200 is the formed workpiece Detailed implementation manners

[0054] The present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the present disclosure are shown. However, the present disclosure may be implemented in other different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0055] Figure 1This is the first preferred embodiment of the present disclosure, which provides a multi-layer film with a surface touch feeling. It is characterized by including a surface protection film 1, an anchoring ink-absorbing layer 2, a first touch support layer 3, a second touch support layer 4, an adhesive layer 5, a pattern layer 6, an anchoring ink-absorbing layer 7, and an ABS film 8 stacked together in sequence.

[0056] The surface protection film 1 has a thickness of 60 - 125 μm, and an acrylic resin film, a PP resin film, or a composite film of an acrylic resin film / PC resin film can be selected. Due to its excellent weather resistance and wear resistance, it has excellent protection characteristics on the surface of the multi-layer film. If the thickness of the surface protection film 1 is less than 60 μm, it is extremely easy to break into pieces during printing, the process control is difficult, and it is very difficult to achieve large-scale production. If the thickness is greater than 125 μm, the cost is relatively high, and the temperature and pressure required during molding are large, which also makes it difficult to flatten the composite film during application. The base film of the surface protection film 1 can be an acrylic resin film, a PP resin film, or a composite film of an acrylic resin film / PC resin film with its own PE / PP protection film; or the above-mentioned simple resin base film can also be selected.

[0057] The anchoring ink-absorbing layer 2 is arranged between the surface protection film 1 and the touch support layer 3. Its main function is to provide an excellent base for the coating of the touch support layer 3 and ensure the uniform transfer during the coating process of the touch support layer 3. The components of the anchoring ink-absorbing layer 2 can be formed by one or more materials such as polyester resin, polyurethane resin, epoxy resin, acrylic acid, acrylic acid-modified resin, polyamide, vinyl chloride-vinyl acetate copolymer (EVA), polyvinyl acetate (PVAc), and polyvinyl chloride (PVC), etc., but are not limited thereto. Thermoplastic resin or thermosetting system can be used. The main requirement for the resin of the anchoring ink-absorbing layer 4 is that no cracking, deformation, delamination, or foaming occurs during the coating and printing process, hot pressing and compounding process, and injection molding process. The thickness of the anchoring ink-absorbing layer 2 is 0.5 - 2 μm. If it is less than 0.5 μm, the ink-absorbing effect is not significant, and the retention effect on the pattern and topography is not obvious; if the thickness is greater than 2 μm, the light transmittance decreases, which will affect the color development effect of the pattern layer, the pattern fullness decreases, and at the same time, the shrinkage of the anchoring layer during the curing process will cause the deformation of the entire film.

[0058] The main functions of the described first tactile support layer 3 are to provide tactile support after molding and to maintain tactile stability during the subsequent injection molding process. Its components mainly consist of a dual-curing UV resin and a pressure-resistant support filler. The use of the dual-curing UV resin enables normal combined coating and printing in the early stage, and after molding, it can be cured to maintain the molded texture. At the same time, the one-time UV molding ensures the stability and reliability of curing. The pressure-resistant support filler can be a composition of organic particles and inorganic particles. The role of the organic particle and inorganic particle composition is to provide an obvious supporting effect before and after coating molding to ensure a certain tactile feeling during the subsequent injection molding process against pressure shock. The organic particles in the first tactile support layer 3 can be one or a combination of polymethyl methacrylate resin microparticles, polystyrene resin microparticles, styrene-methyl methacrylate copolymer microparticles, polyethylene resin microparticles, epoxy resin microparticles, polysiloxane resin microparticles, polyvinylidene fluoride resin, or polyvinyl fluoride resin microparticles with hydrophobic or hydrophilic treatment on the surface. The average particle size of the organic particles ranges from 3 to 10 μm. If the particle size of the organic particles is too low, the strength of the entire cured system will be too low, and obvious thixotropy will occur during the molding process. If the particle size of the organic particles is too high, the light shielding degree of the overall coating will increase significantly, which will affect the overall UV curing effect. The inorganic particles in the tactile support layer 3 can be silica nanoparticles, which can prevent the sedimentation of organic particles and increase the fineness of the anti-glare hard coating surface. In the present invention, the average primary particle size (d50) of the applicable silica nanoparticles is about between 5 nm and 30 nm, and the average secondary particle size (d50) is about between 50 nm and 120 nm.

[0059] The thickness of the described first tactile support layer 3 is 25 - 40 μm. If it is less than 25 μm, the deformation after subsequent molding is small, and it is not sufficient to provide a high-level tactile feeling. If the thickness is higher than 40 μm, it is prone to breakage or delamination between coatings during the processing, resulting in problems such as film cracking.

[0060] The main functions of the second tactile support layer 4 are to provide tactile support after molding and to maintain tactile stability during the subsequent injection molding process. At the same time, the second tactile support layer 4 has a certain elasticity to ensure the overall tactile elastic effect. The components of the second tactile support layer 4 mainly consist of a dual-curing UV resin and an elastomer filler. The use of the dual-curing UV resin enables normal combined coating and printing in the early stage, and after molding, it can be cured to maintain the molded texture. At the same time, the one-time UV molding ensures the stability and reliability of curing. The role of the elastomer filler is to ensure that the entire cured coating has a certain elasticity, guaranteeing a certain tactile elasticity. The elastomer filler can be an organic TPU elastomer or an organosilicon elastomer. The thickness of the described second tactile support layer 4 is 10 - 15 μm.

[0061] The components of the adhesive layer 5 are formed by one or more materials of polyester resin, polyurethane resin, epoxy resin, acrylic acid and acrylic modified resin, polyamide and chlorovinyl resin, but are not limited thereto. And the second adhesive layer 50 may also include an isocyanate curing agent. The above-mentioned isocyanate curing agent, for example, can be selected from one or more of the group consisting of hexamethylene diisocyanate (HMDI), toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI) and isophorone diisocyanate (IPDI). The isocyanate curing agent as described above can include a range of 0 to 30 parts by weight relative to 100 parts by weight of the overall above-mentioned adhesive layer coating liquid, preferably limited to a content of the above-mentioned isocyanate curing agent of less than 20 parts by weight to improve formability, and more preferably includes 15 to 20 parts by weight of the above-mentioned isocyanate curing agent. The main function of the adhesive layer 5 is to have a hot-pressing bonding effect with the ABS film 8 during the hot-pressing composite process, so that the above-mentioned coating and the ABS film material are completely composited and bonded into one after the composite process. The thickness of the adhesive layer 5 is between 8 and 20 μm, preferably between 9 and 16 μm.

[0062] The main function of the pattern layer 6 is to provide a decorative effect in the final finished workpiece, and at the same time to provide a covering effect on the subsequent injection molded products. The ink layer 30 can be a pattern layer formed by a single color, two colors, or multiple colors. The pattern layer 6 can be printed using a gravure printing process with a thickness of 3-15μm. If the thickness of the pattern layer is less than 3μm, the coverage of the pattern layer will be low, which will affect the printing effect of the overall pattern layer and the color presentation of the entire product; if the thickness is greater than 15μm, a certain amount of solvent will be present in the ink layer, and bubbles will appear in the subsequent compounding process. After injection molding, the ink layer will be delaminated and broken during the resistance test, resulting in a decrease in overall resistance.

[0063] The anchoring ink-absorbing layer 7 is arranged on the ABS film 8, and its main function is to provide an excellent base for coating the pattern layer 6, and ensure uniform transfer of the pattern layer 6 during coating. The components of the anchoring ink-absorbing layer 7 can be selected from components similar to those of the anchoring ink-absorbing layer 2, and the thickness is controlled at 0.5-2 μm.

[0064] In the multilayer film with surface touch, the thickness of the ABS film 8 is 250-500 microns. The function of the ABS film 8 is that it is the lowest layer of the finished workpiece, and it plays a role of weather protection for the entire workpiece during the workpiece compounding process and injection molding process, and also plays a role of a support body during the compounding process.

[0065] The present invention provides a decorative film, please refer to Figures 1 to 5 , a method for manufacturing a decorative film for in-mold transfer according to a preferred embodiment of the present invention is schematically illustrated in a cross-sectional view.

[0066] The manufacturing method of the present invention is as follows:

[0067] Step 1, as Figure 2 shown, first print an anchoring ink-absorbing layer 2 on the surface protection film 1. The manufacturing method of the anchoring ink-absorbing layer 2 can be carried out by using known coating methods such as anilox roll or gravure.

[0068] In the multi-layer film, the surface protection film 1 can be an acrylic film (PMMA), and the thickness of the PE film 1 is 60 - 125 μm.

[0069] In the multi-layer film, the thickness of the anchoring ink-absorbing layer 2 is 0.5 - 2 μm, preferably controlled between 0.6 - 1 μm.

[0070] Step 2, as Figure 2 shown, form a tactile support layer 3 on the anchoring ink-absorbing layer 2. The manufacturing method of the first tactile support layer 3 can be carried out by using known coating methods such as three-roll, gravure, wire bar, intaglio, anilox roll, and rubber plate.

[0071] In the multi-layer film, the thickness of the first tactile support layer 3 is 25 - 40 μm, and the main resin composition is a dual-curing UV resin, solvents such as ethyl acetate / propyl acetate, and pressure-resistant support fillers of organic and inorganic particles; it is required that no cracking, peeling, and deformation occur on the coating surface during the lamination process.

[0072] Step 3, as Figure 2 shown, form a second tactile support layer 4 on the first tactile support layer 3. The manufacturing method of the second tactile support layer 4 can be carried out by using known coating methods such as three-roll, five-roll, wire bar, intaglio, anilox roll, and rubber plate.

[0073] In the multi-layer film, the thickness of the second tactile support layer 4 is 10 - 15 μm, and the main resin composition is a dual-curing UV resin and an elastomeric filler.

[0074] The above surface protection film 1, anchoring ink-absorbing layer 2, first tactile support layer 3, and second tactile support layer 4 together constitute a tactile formation layer 10.

[0075] Step 4, as Figure 3 shown, print an anchoring ink-absorbing layer 7 on the surface of the ABS film 8. The manufacturing method of the anchoring ink-absorbing layer 7 can be carried out by using known coating methods such as anilox roll or gravure.

[0076] In the multi-layer film, the thickness of the ABS film 8 is 200 - 500 μm.

[0077] In the multi-layer film, the thickness of the anchoring ink-absorbing layer 7 is 0.5 - 2 μm, preferably controlled between 0.6 - 1 μm.

[0078] Step 5, as Figure 3 shown, a pattern layer 6 is formed on the upper surface of the anchoring ink-absorbing layer 7. The manufacturing method of the pattern layer 6 can be manufactured by using well-known coating methods such as three-roll, five-roll, wire bar, gravure, anilox roll, and rubber plate. The ink layer can be a single-color ink layer, a metal pattern layer, or can also be printed by using the method of multi-layer overprinting.

[0079] In the decorative film, the thickness of the pattern layer 6 is 3 - 15 μm. It is preferably controlled between 5.0 - 10.0 μm.

[0080] The above-mentioned pattern layer 6, anchoring ink-absorbing layer 7, and ABS film 8 form an ink pattern film 20.

[0081] Step 6, as Figure 4 shown, using an on-line coating and laminating machine, a paste layer 5 is formed on the surface of the pattern layer 6. The manufacturing method of the paste layer 5 can be manufactured by using well-known coating methods such as three-roll, five-roll, wire bar, gravure, anilox roll, and rubber plate. At the same time, using an on-line laminating machine, the tactile forming layer 10 and the ink pattern film 20 are hot-pressed and laminated together on-line, and a surface tactile pattern is formed through a calender roll; then through a nitrogen environment, it is cured by a UV lamp with a radiation dose of 80 - 150 mJ / cm2 to form a multi-layer film 100 with a surface tactile feeling.

[0082] In the multi-layer film, the on-line laminating process can use the low-temperature laminating technology, which can also be called the on-line laminating process. The temperature is controlled at 80 - 100 °C, and the vehicle speed can be controlled at 10 - 40 m / min; because the adhesive supporting the low-temperature laminating process has a certain viscosity on the surface, 80 - 100 °C is required to volatilize the solvent on the coating surface. If the temperature is too high, the surface of the paste layer will lose its viscosity and cannot be laminated. If the temperature is too low, the solvent cannot volatilize, resulting in problems such as blistering, poor compaction, and delamination in the subsequent lamination. Due to 80 - 100 °C, the vehicle speed should not be too fast. If the vehicle speed is too fast, the solvent cannot volatilize, and the situation of poor compaction in lamination will occur. If the vehicle speed is too low, the composite substrate will be severely deformed under the condition of hot pressing.

[0083] At the same time, the high-temperature laminating technology, which can also be called the off-line laminating process, can also be used. Its temperature is controlled at 220 - 280 °C, and the vehicle speed can be controlled at 40 - 100 m / min. High-temperature lamination generally uses thermoplastic adhesives. Due to the relatively high temperature, the vehicle speed will increase accordingly. If the vehicle speed is too low or the temperature is too high, serious problems of substrate heat deformation will occur. If the temperature is too low or the vehicle speed is too fast, the surface of the adhesive cannot be softened sufficiently, resulting in a lower bonding strength in lamination.

[0084] Step 7, as Figure 5As shown, the final multi-layer film 100 with surface touch is placed in an injection molding machine using an injection molding device, and injection molding is performed to form the final workpiece 200.

[0085] Next, through the preferred embodiments of the present invention, the structure and function of the present invention will be described in more detail. However, this is presented as a preferred example of the present invention and cannot be construed in any sense that the present invention is limited thereto. Contents not described herein can be fully technically analogized by those of ordinary skill in the art, so the description thereof is omitted.

[0086] Example 1

[0087] On a 75-μm-thick acrylic film (PMMA), a 0.6-μm-thick acrylic polyurethane resin composition is coated by means of kiss coating with a gravure roll to form an anchoring ink-absorbing layer.

[0088] On the above-mentioned anchoring ink-absorbing layer, a 40-μm-thick first touch support layer 3 is coated by means of microgravure printing. The resin composition used for the first touch support layer 3 is the resin composition in Table 1.

[0089] On the above-mentioned first touch support layer 3, a 10-μm-thick second touch support layer 4 is coated by means of microgravure printing. The resin composition 2 used for the second touch support layer 4 is the resin composition in Table 2.

[0090] The above-prepared surface protection film 1, anchoring ink-absorbing layer 2, first touch support layer 3, and second touch support layer 4 together constitute a touch-forming layer 10 for standby.

[0091] On the surface of a 250-μm-thick ABS film 8, a 0.6-μm-thick acrylic polyurethane resin composition is coated by means of kiss coating with a gravure roll to form an anchoring ink-absorbing layer 7.

[0092] On the surface of the anchoring ink-absorbing layer 7, a metallic silver layer is printed by means of gravure printing.

[0093] The above-prepared pattern layer 6, anchoring ink-absorbing layer 7, and ABS film 8 constitute an ink pattern film 20.

[0094] Using an on-line coating and laminating machine, on the surface of the pattern layer 6, a 12-μm-thick adhesive layer 5 is formed by means of microgravure coating; at the same time, using an on-line laminating machine, the touch-forming layer 10 and the ink pattern film 20 are hot-pressed and laminated together online, and a surface touch pattern is formed through a calender roll; then, after being cured by a UV lamp with a radiation dose of 150 mJ / cm2 in a nitrogen environment, a multi-layer film with surface touch is formed.

[0095] Using an injection molding device, the above final multi-layer film is placed in an injection molding machine, and injection molding is performed to form the final workpiece.

[0096] Example 2

[0097] On a 100-μm-thick acrylic film (PMMA), an anchoring ink-absorbing layer is formed by coating a 0.6-μm acrylic polyurethane resin composition using gravure printing.

[0098] On the above-mentioned anchoring ink-absorbing layer, a first tactile support layer 3 with a thickness of 25 μm is coated using a slot coating method. The resin composition used for the first tactile support layer 3 is the resin composition in Table 1.

[0099] On the above-mentioned first tactile support layer 3, a second tactile support layer 4 with a thickness of 15 μm is coated using a slot coating method. The resin composition 2 used for the second tactile support layer 4 is the resin composition in Table 2.

[0100] The prepared surface protection film 1, anchoring ink-absorbing layer 2, first tactile support layer 3, and second tactile support layer 4 together constitute a tactile formation layer 10 for standby.

[0101] On the surface of a 400-μm-thick ABS film 8, an anchoring ink-absorbing layer 7 is formed by coating a 0.9-μm acrylic polyurethane resin composition using reverse microgravure.

[0102] On the surface of the anchoring ink-absorbing layer 7, multiple pattern combination layers are printed using gravure printing.

[0103] The prepared pattern layer 6, anchoring ink-absorbing layer 7, and ABS film 8 form an ink pattern film 20.

[0104] Using an on-line coating and laminating machine, a 12-μm-thick adhesive layer 5 is formed on the surface of the pattern layer 6 using microgravure coating; at the same time, using an on-line laminating machine, the tactile formation layer 10 and the ink pattern film 20 are laminated together by hot pressing online, and a surface tactile pattern is formed through a molding roller; then, after being cured by a UV lamp with a radiation dose of 120 mJ / cm² in a nitrogen environment, a multi-layer film with a surface tactile feeling is formed.

[0105] Using an injection molding device, the above-mentioned final multi-layer film is placed in an injection molding machine and injection molded to form a final workpiece.

[0106] Example 3

[0107] On a 125-μm-thick acrylic film (PMMA), an anchoring ink-absorbing layer is formed by coating a 1.1-μm acrylic polyurethane resin composition using gravure printing.

[0108] On the above-mentioned anchoring ink-absorbing layer, a first tactile support layer 3 with a thickness of 35 μm is coated by a three-roll coating method. The resin composition used for the first tactile support layer 3 is the resin composition in Table 1.

[0109] On the above-mentioned first tactile support layer 3, a second tactile support layer 4 with a thickness of 12 μm is coated by a slot coating method. The resin composition 2 used for the second tactile support layer 4 is the resin composition in Table 2.

[0110] The prepared surface protection film 1, anchoring ink-absorbing layer 2, first tactile support layer 3, and second tactile support layer 4 together constitute a tactile formation layer 10 for standby.

[0111] On the surface of an ABS film 8 with a thickness of 360 μm, an anchoring ink-absorbing layer 7 with a thickness of 1.0 μm is coated by a reverse gravure coating method using an acrylic polyurethane resin composition.

[0112] On the surface of the anchoring ink-absorbing layer 7, multiple pattern combination layers are printed by a gravure printing method.

[0113] The prepared pattern layer 6, anchoring ink-absorbing layer 7, and ABS film 8 form an ink pattern film 20.

[0114] Using an on-line coating and laminating machine, on the surface of the pattern layer 6, a paste layer 5 with a thickness of 15 μm is formed by a slot coating method; at the same time, using an on-line laminating machine, the tactile formation layer 10 and the ink pattern film 20 are hot-pressed and laminated together on-line, and a surface tactile pattern is formed through a calender roll; then, after being cured by a UV lamp with a radiation dose of 120 mJ / cm2 in a nitrogen environment, a multi-layer film with a surface tactile feeling is formed.

[0115] Using an injection molding device, the above-mentioned final multi-layer film is placed in an injection molding machine, and injection molding is carried out to form a final workpiece.

[0116] Example 4

[0117] On a polyethylene film (PE) with a thickness of 125 μm, an anchoring ink-absorbing layer is coated by a gravure printing method using an acrylic polyurethane resin composition with a thickness of 0.9 μm.

[0118] On the above-mentioned anchoring ink-absorbing layer, a first tactile support layer 3 with a thickness of 32 μm is coated by a microgravure method. The resin composition used for the first tactile support layer 3 is the resin composition in Table 1.

[0119] On the above-mentioned first tactile support layer 3, a second tactile support layer 4 with a thickness of 12 μm is coated by a slot coating method. The resin composition 2 used for the second tactile support layer 4 is the resin composition in Table 2.

[0120] The prepared surface protection film 1, anchoring ink-absorbing layer 2, first tactile support layer 3, and second tactile support layer 4 together constitute the tactile formation layer 10, reserved for use.

[0121] On the surface of a 400-μm-thick ABS film 8, a 0.9-μm-thick acrylic polyurethane resin composition is coated in a reverse rotation manner using a gravure coater to form the anchoring ink-absorbing layer 7.

[0122] On the surface of the anchoring ink-absorbing layer 7, multiple pattern combination layers are printed using intaglio printing.

[0123] The above-prepared pattern layer 6, anchoring ink-absorbing layer 7, and ABS film 8 form the ink pattern film 20.

[0124] Using an on-line coating and laminating machine, on the surface of the pattern layer 6, a 18-μm-thick adhesive layer 5 is formed using a gravure coater; at the same time, using an on-line laminating machine, the tactile formation layer 10 and the ink pattern film 20 are hot-pressed and laminated together on-line, and a surface tactile pattern is formed through a calender roll; then, after being cured by a UV lamp with a radiation dose of 150 mJ / cm2 in a nitrogen environment, a multi-layer film with a surface tactile feeling is formed.

[0125] Using an injection molding device, the above final multi-layer film is placed in an injection molding machine, and injection molding is carried out to form the final workpiece.

[0126] Comparative Example 1

[0127] After a general 75-μm-thick PMMA substrate coated with printed matter is laminated with a 360-μm-thick ABS film sheet and formed, a surface tactile pattern is formed through a calender roll to make a decorative film for in-mold transfer. It is placed in an injection molding machine, and injection molding is carried out to form the final workpiece.

[0128] Comparative Example 2

[0129] After a general 100-μm-thick PC substrate coated with printed matter is laminated with a 400-μm-thick ABS film sheet and formed, a surface tactile pattern is formed through a calender roll to make a decorative film for in-mold transfer. It is placed in an injection molding machine, and injection molding is carried out to form the final workpiece.

[0130] Table 1 Surface Composition of the First Tactile Support Layer 3

[0131]

[0132] Table 2 Surface Composition of the Second Tactile Support Layer 4

[0133]

[0134] Evaluation of Physical Properties

[0135] The main technical indicators and evaluation methods are as follows:

[0136] The first part, tactile property test method:

[0137] (i) Overall tactile sensation

[0138] Evaluate the feeling of contact with human hands according to the following criteria.

[0139] ○: There is an obvious tactile sensation

[0140] Δ: There is a slight tactile sensation

[0141] ×: There is almost no tactile sensation

[0142] (ii) Concavity and convexity Evaluate the feeling of contact with human hands according to the following criteria.

[0143] ○: The shape of each convexity is obvious and has the details of concavity and convexity.

[0144] Δ: There is a slight unevenness.

[0145] ×: There is no obvious feeling.

[0146] (iii) Tactile elasticity

[0147] ○: There is an obvious indentation after pressing the surface, and the surface recovers slowly.

[0148] Δ: There is a tactile elasticity when pressing the surface.

[0149] ×: There is no obvious change when pressing the surface.

[0150] The second part, physical and processing property test methods:

[0151] Test method for high and low temperature cycle resistance characteristics: The molded parts are subjected to the following temperature cycles, -35°C ± 2°C, 5h → 23°C ± 2°C, (50 ± 3)%RH, 0.5h → high temperature condition (90°C), 5h → 23°C ± 2°C, (50 ± 3)%RH, 0.5h → 50°C ± 2°C, (95 ± 3)%RH, 2h → 23°C ± 2, (50 ± 3)%RH, 0.5h, and then repeat the first four steps in sequence to end.

[0152] Test method for heat aging resistance: Place the molded parts in a high temperature oven at 90°C for 168h, place them at room temperature for 2h, and then evaluate the appearance and color change.

[0153] Test method for light aging resistance: Conduct the test according to SAE J2412, irradiation dose 1240kJ / m 2 for testing.

[0154] After the above tests are completed, evaluate the appearance and adhesion respectively. The appearance is evaluated by visual inspection, and the adhesion is tested by the cross-cut method. The judgment criteria are as follows:

[0155] Appearance evaluation criteria:

[0156] ○: After the test, there are no wrinkles on the surface of the diaphragm; there are no cracks, fractures, whitening, peeling, or swelling in appearance; there is no fading or gloss change in color; there is no blurring, stickiness, or wiping fading on the surface state, and there are no defects such as stains on the effective surface;

[0157] ×: After the test, wrinkles appear on the surface of the diaphragm or there are cracks, fractures, whitening, peeling, or swelling in appearance; there is fading or gloss change in color; the surface state is blurred, sticky, or wiped fading, and there are defects such as stains on the effective surface.

[0158] Adhesion evaluation criteria:

[0159] ○: By the cross-cut method, use 3M610 tape to closely adhere the adhesive tape to the surface of the sample without air bubbles, and then quickly tear off the adhesive tape along the 45-degree direction of the surface of the part, and there is no peeling off;

[0160] ×: By the cross-cut method, use 3M610 tape to closely adhere the adhesive tape to the surface of the sample without air bubbles, and then quickly tear off the adhesive tape along the 45-degree direction of the surface of the part, and there is peeling off in 1 or more small grids.

[0161] Table 3 Test results of the tactile properties of the multi-layer film with surface touch in the examples and comparative examples

[0162]

[0163] Table 4 Test results of the physical properties of the multi-layer film with surface touch in the examples and comparative examples

[0164]

[0165]

[0166] In summary of the above comparison, the present disclosure uses a multi-layer film with surface touch for decoration on the surface of plastic parts, which can show a high-quality decorative effect, and at the same time has an outstanding surface touch, and can meet the needs of current mainstream high-grade decoration, especially the needs of automotive interior parts with three-dimensional stretch forming. The drawn film using this technology has various stretch forming styles, good surface protection, and wear resistance, so it can meet the needs of fields with special requirements for deep stretch forming and durability such as automotive interiors.

[0167] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and all these changes and improvements fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A multilayer film, characterized in that: It is composed of a surface protection film, an anchoring ink-absorbing layer, a first tactile support layer, a second tactile support layer, an adhesive layer, a pattern layer, an anchoring ink-absorbing layer, and an ABS film that are stacked on top of each other from top to bottom and prepared together. Among them, the surface protection film, the anchoring ink-absorbing layer, the tactile support layer, and the tactile support layer form a tactile formation layer; the pattern layer, the anchoring ink-absorbing layer, and the ABS film form an ink pattern film; the thickness of the first tactile support layer is 25 - 40μm; the components of the first tactile support layer 3 are mainly composed of a dual-curing UV resin and a pressure-resistant support filler, and the pressure-resistant support filler is selected as a composition of organic particles and inorganic particles; the thickness of the adhesive layer is 8 - 20μm; the thickness of the pattern layer is 3 - 15μm; the thickness of the anchoring ink-absorbing layer is 0.5 - 2μm: the thickness of the ABS film is 250 - 500μm.

2. The multilayer film according to claim 1, wherein: The surface protection film includes using a PMMA, PC, or PP film, and its thickness is 60 - 125μm.

3. The multilayer film according to claim 1, characterized in that: The thickness of the anchoring ink-absorbing layer is 0.5 - 2μm.

4. The multilayer film according to claim 1, characterized in that: The thickness of the second tactile support layer is 10 - 15μm; the components of the second tactile support layer are mainly composed of a dual-curing UV resin and an elastomer filler.

5. A manufacturing method of a multi-layer film for in-mold transfer printing, including the multi-layer film according to any one of claims 1-4, characterized in that: It includes the following steps: Step 1, form an anchoring ink-absorbing layer on the surface of the surface protection film. Step 2, form a first tactile support layer on the anchoring ink-absorbing layer formed in Step 1. Step 3, form a second tactile support layer on the first tactile support layer formed in Step 2. Form a pattern layer on the ink pattern film, and the pattern layer can be a single-color or multi-color combination pattern. Step 4, print an anchoring ink-absorbing layer on the surface of the ABS film. Step 5, form a pattern layer on the surface of the anchoring ink-absorbing layer. The above pattern layer, anchoring ink-absorbing layer, and ABS film form an ink pattern film. Step 6, use an online coating and laminating machine to form an adhesive layer on the surface of the pattern layer. At the same time, use an online laminating machine to thermally laminate the tactile formation layer and the ink pattern film together online, and form a surface tactile pattern through a molding roller; then, after passing through a nitrogen environment and curing with a UV lamp, form a multi-layer film with a surface tactile feeling.

6. A method for manufacturing a multi-layer film having a surface touch feeling, including the multi-layer film according to any one of claims 1-4, characterized in that: It includes the following steps: Step 1: Corona-treat the surface of a surface protection film, print an anchoring ink-absorbing layer on the corona side, coat and form a first tactile support layer on the surface of the anchoring ink-absorbing layer, and then coat and form a second tactile support layer on the surface of the first tactile support layer, thus together constituting a tactile formation layer. Step 2: Use printing equipment to print an anchoring ink-absorbing layer and a pattern layer on one side of the ABS film in sequence, and the pattern can be one layer or multiple layers; the above pattern layer, anchoring ink-absorbing layer, and ABS film form an ink pattern film. Step 3: Use an online coating and laminating machine to coat the adhesive layer online on the pattern layer side of the ink pattern film. After drying, thermally laminate it with the ink pattern film, form a surface tactile pattern through a molding roller, and cure it with a UV lamp with a radiation dose of 80 - 150mJ / cm2 in a nitrogen environment to form a multi-layer film with a tactile feeling. Step 4: After putting the multi-layer film into an injection molding machine for injection molding, a final injection molded workpiece is obtained. At the same time, due to the touch support layer, this workpiece has an obvious and stable surface touch.

7. Apply the multi-layer film prepared by the manufacturing method of the multi-layer film according to claim 6 to the surface of a plastic part decorated with a molded film sheet having a surface touch effect.

Images