Multi-layer film with surface touch sense and preparation method and use method of multi-layer film

Abstract

The invention relates to the technical field of automobile inner surface decoration membranes, and particularly discloses a multilayer membrane with surface touch sense and a preparation method and a use method thereof. The multilayer film comprises an ABS (Acrylonitrile Butadiene Styrene) base film, and a background layer, a pattern texture layer, a touch texture layer and a surface protection film which are sequentially formed on the ABS base film, the raw material component of the touch texture layer comprises a double-component coating material, and the double-component coating material comprises a main agent and a hardening agent. The ABS base film has higher toughness, tensile resistance and thermal stability, and can better adapt to subsequent embossing treatment and molding injection molding processes; the background layer provides an excellent substrate and color contrast for printing of the pattern texture layer, and it is ensured that the pattern texture layer can be uniformly and consistently transferred during printing; the pattern texture layer plays a role in decorating and beautifying, and also plays a role in covering an injection molding workpiece; and the touch texture layer made of a specific material is adopted, so that the touch loss of the multilayer film in the subsequent molding injection molding process is lower, and the touch effect is easier to maintain.

Description

Technical Field

[0001] The invention relates to the technical field of decorative film sheets for vehicle interior surfaces, and in particular to a multilayer film with surface tactile sensation and a preparation method and a use method thereof. Background Art

[0002] With the development of society, household appliances, automobiles, mobile phones and other components have adopted a large number of plastic parts. The surface of plastic parts is decorated with molded films with surface tactile effects, which can show a high-quality decorative effect and meet the needs of high-end automobile decoration, especially the needs of automobile interior parts with highly stretched three-dimensional structures.

[0003] At present, the preparation method of multilayer films with surface touch is to emboss the surface of acrylic resin (PMMA) film, or to print a touch coating on the surface of PMMA layer, or to print the touch coating after pattern printing, so that the composite multilayer film has the effect of surface touch. However, due to the physical properties of PMMA, such as brittleness, low tensile strength, low hardness and poor high temperature stability, the touch effect film obtained by embossing on PMMA is difficult to meet the needs of automotive interior parts with highly stretched three-dimensional structure. The method of printing the touch layer on the surface of PMMA layer also has the above problems. In addition, during the injection molding process, the touch layer will show the problem of peeling off and reduced touch under the injection molding pressure. Even if the touch coating is printed after the pattern layer is printed on the PMMA surface, the touch coating on the inside will cause the surface of the multilayer film to be uneven in the subsequent composite process with ABS (acrylonitrile-butadiene-styrene copolymer) base film, and problems such as blistering and unreal composite will occur during the composite process. Although increasing the composite pressure can reduce composite defects, it will also cause loss of touch.

[0004] Patents CN115320193A and CN218876535U print two tactile support layers after printing the pattern layer on the ABS base film. However, the tactile texture layer and the ink pattern film still need to be compounded through the adhesive layer, and there are still problems such as blistering and unreal compounding. In addition, the manufacturing cost is high, the process is complicated, and the production efficiency is low. In the subsequent processing, there is still the effect of reduced tactile sensation caused by injection molding pressure. Therefore, it is still necessary to improve the materials and manufacturing process to develop a new decorative film with surface tactile effect, which has the characteristics of high processing efficiency, good tactile effect, and continuous roll-to-roll production while ensuring that the existing injection molding process remains unchanged and the cost is controllable. Summary of the invention

[0005] In response to the above problems, the present invention provides a multilayer film with surface touch, and a preparation method and a use method thereof. By adjusting the structure of the multilayer film, the manufacturing cost is greatly reduced, and the tactile effect is excellent. It can be used for surface decoration with strong tactile effects such as high-stretch complex three-dimensional structure automobile interiors.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is: In a first aspect, the present invention provides a multilayer film with a surface touch, comprising an ABS base film and a background layer, a pattern texture layer, a tactile texture layer, and a surface protection film sequentially formed on the ABS base film; the raw material components of the tactile texture layer include a two-component coating material, and the two-component coating material includes a main agent and a hardener.

[0007] Compared with the prior art, the multilayer film with surface touch provided by the present invention (hereinafter referred to as the multilayer film) adopts ABS as the base film, which has higher toughness, tensile resistance and thermal stability. The ABS base film is at the bottom layer of the multilayer film, which can better adapt to the subsequent embossing treatment and molding injection molding process, avoid the pattern texture layer and the touch texture layer from directly contacting the molten plastic workpiece, so that the multilayer film can be better molded into a finished workpiece with the molten plastic workpiece; the background layer provides an excellent base and lining color for the printing of the pattern texture layer, ensuring that the pattern texture layer can be uniformly and consistently transferred during printing, so that the color texture of the pattern texture layer is more obvious, the contrast is stronger, and it also plays a role in covering the injection molded workpiece; the pattern texture layer plays a role in decoration and beauty, and at the same time has a covering effect on the injection molded workpiece below; the touch texture layer makes the surface of the multilayer film have a strong real touch effect; the surface protection film is used to protect the touch texture layer. The present invention adopts a touch texture layer of a specific material, so that the touch loss of the multilayer film in the subsequent molding and injection molding process is lower, and the touch effect is easier to maintain.

[0008] Preferably, the thickness of the ABS base film is 250 μm to 500 μm.

[0009] Preferably, the raw material components of the background layer include polymethacrylic resin and polyurethane resin.

[0010] Preferably, the mass ratio of the polymethacrylic resin to the polyurethane resin is 10:(2-8).

[0011] Preferably, the background layer has a thickness of 3 μm to 12 μm.

[0012] The present invention has found through a large number of experiments that when the thickness of the background layer is less than 3 μm, the background layer cannot provide a good base and background color for the pattern texture layer; when the thickness is greater than 12 μm, the cost becomes high, and the amount of solvent in the background layer increases, which is easy to cause delamination and breakage in the subsequent processing process, affecting the service life of the multilayer film.

[0013] Preferably, the raw material components of the pattern texture layer include polymethacrylic resin, polyurethane resin and pigment.

[0014] Preferably, the mass ratio of the polymethacrylic resin, the polyurethane resin and the pigment is 10:(2-8):(0.9-3.6).

[0015] Preferably, the thickness of the pattern texture layer is 1 μm to 5 μm, more preferably 3 μm to 5 μm.

[0016] The present invention has found through a large number of experiments that when the thickness of the pattern texture layer is less than 1 μm, the pattern coverage will be low, and the thin coating will be easily damaged by impurities during printing, thereby affecting the printing effect of the pattern texture layer and the presentation of the pattern texture of the entire product; when the thickness is greater than 5 μm, the cost will become higher, and the residual solvent in the pattern ink will increase, which will easily cause the ink layer to break during subsequent processing, affecting the service life of the multilayer film.

[0017] Preferably, the mass ratio of the main agent to the hardener is 100:(3.8~4.2).

[0018] Preferably, the main agent includes at least one of polyester polyurethane or acrylic polyurethane.

[0019] Preferably, the hardener includes at least one of hexamethylene diisocyanate (HDI) or isophorone diisocyanate (IPDI).

[0020] Preferably, the two-component coating material is Lioduras MOL8020M CN produced by Toyochem.

[0021] Preferably, the tactile texture layer has a thickness of 60 μm to 125 μm, more preferably 60 μm to 100 μm.

[0022] The present invention has found through a large number of experiments that when the thickness of the tactile texture layer is less than 60μm, the tactile sensation will be partially lost during the subsequent lamination (the process of forming a surface protection film) and molding (including high temperature and high pressure molding and injection molding), resulting in a weak tactile sensation and difficulty in meeting customer requirements; when the thickness is greater than 125μm, the cost becomes high, and it is easy to cause adjacent pattern texture layers and surface protection films to be squeezed and damage the multi-layer film structure. At the same time, breakage or delamination between coatings is prone to occur during the processing process, leading to problems such as cracking of the multi-layer film.

[0023] Preferably, the texture depth of the tactile texture layer is 30 μm to 60 μm.

[0024] Preferably, the thickness of the surface protection film is 30 μm to 60 μm.

[0025] The present invention has found through a large number of experiments that when the thickness of the surface protection film is less than 30 μm, the protection of the tactile texture layer is insufficient, and the surface protection film is easily damaged, causing the tactile texture layer to be damaged and contaminated; when the thickness is greater than 60 μm, the cost is high, and the temperature and pressure required for subsequent molding of the multilayer film also become larger, resulting in energy waste.

[0026] Preferably, the surface protection film is made of polyethylene.

[0027] The present invention adopts polyethylene (PE) film as the surface protection film, which has the advantages of low viscosity, stable adhesion, good adhesion, good re-peeling performance, and no residual glue, and can well protect the tactile texture layer on the surface of the multilayer film.

[0028] In a second aspect, the present invention provides a method for preparing the multilayer film having a surface tactile feel, comprising the following steps: S1, printing a background layer on an ABS base film, and printing a pattern texture layer on the background layer; S2, printing a two-component coating material on the pattern texture layer to form a coating with a background color, and after pre-drying, embossing the coating with a tactile texture roller, and after drying and curing, obtaining a tactile texture layer on the pattern texture layer; S3, covering the tactile texture layer with a surface protection film, and rolling up to obtain a multilayer film with a surface tactile feel.

[0029] The method for preparing a multilayer film with a surface tactile feel provided by the present invention forms a uniform tactile texture layer on a pattern texture layer by means of printing-pre-drying-embossing treatment-drying and curing. The present invention obtains a tactile texture layer of a specific material by improving the embossing treatment process, greatly reducing the manufacturing cost, and having an excellent tactile effect, and can be used for surface decoration with a strong tactile effect such as high-stretch complex three-dimensional structure automobile interior. The multilayer film with a surface tactile feel provided by the present invention has a simple preparation process, low cost, high processing efficiency, small tactile loss in the subsequent injection molding process, and can be produced continuously roll-to-roll.

[0030] Preferably, in S1, the method of printing the background layer includes gravure coating or slot extrusion coating.

[0031] The present invention can achieve uniform coating of the background layer within a required thickness through a specific printing method.

[0032] Preferably, in S1, the pattern texture layer is printed by gravure coating.

[0033] For example, in S1, three rollers, five rollers, wire rods, gravure plates, anilox rollers and rubber plates can be used for coating and printing of the pattern texture layer; single-layer or multi-layer overprinting can be used for printing.

[0034] Preferably, in S1, the texture style of the pattern texture layer is a wood grain texture.

[0035] Preferably, in S2, the main agent of the two-component coating material is first added to a solvent for dilution, the obtained diluted main agent is mixed with the hardener of the two-component coating material, and then the printing is performed by slit extrusion coating.

[0036] Further preferably, in S2, the solvent is ethyl acetate.

[0037] Further preferably, in S2, the solid content of the diluent main agent is 30% to 45%, and the viscosity is 60 mPa‧s to 200 mPa‧s.

[0038] The present invention processes the two-component coating material through the above steps, which can further ensure that cracking, deformation, delamination and blistering will not occur during the coating, pre-drying, drying and curing process and the subsequent injection molding process. The thickness of the slit extrusion coating can be achieved in a wide range to meet the uniform coating requirements of the tactile texture layer thickness.

[0039] Preferably, in S2, the pre-drying temperature is 35° C. to 45° C., and the pre-drying time is 4 d to 6 d.

[0040] For example, the material of the tactile texture roller is polytetrafluoroethylene.

[0041] Preferably, in S2, the texture depth of the tactile texture roller is 30 μm to 60 μm.

[0042] Preferably, in S2, the drying and curing temperature is 55° C. to 65° C., and the drying and curing time is 1 day to 3 days.

[0043] For example, in S3, a laminating machine is used to cover the surface protection film on the tactile texture layer.

[0044] In a third aspect, the present invention provides a method for using the multilayer film having a surface tactile feel, comprising the following steps: The multilayer film with a surface tactile feel is molded at 10MPa~30MPa and 120℃~140℃ using a molding device, and then placed in an injection molding device, and a molten plastic workpiece is filled under the ABS base film of the multilayer film with a surface tactile feel, and cooled and shaped to obtain a molded workpiece.

[0045] Preferably, the material of the plastic workpiece is ABS resin or a mixed resin of polycarbonate and ABS.

[0046] For example, after molding, a punching machine is required to punch out the peripheral materials before placing it in the injection molding equipment.

[0047] The present invention adopts INS molding (embedded film injection molding decoration) technology to produce surface decoration with strong tactile effect for high-stretch complex three-dimensional structure automobile interior and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the structure of the multilayer film with surface touch in the present invention; Figure 2 It is a schematic diagram of the structure of the formed workpiece in the present invention; In the figure, 1 represents a surface protection film, 2 represents a tactile texture layer, 3 represents a pattern texture layer, 4 represents a background layer, 5 represents an ABS base film, 6 represents a plastic workpiece, 10 represents a multilayer film with a surface tactile feel, and 100 represents a molded workpiece. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0050] In the present invention, materials not otherwise specified are all commercially available products.

[0051] Example 1 This embodiment provides a multilayer film with surface tactile sensation and a preparation method thereof.

[0052] See also Figure 1 In this embodiment, the multilayer film 10 with a surface touch feeling comprises an ABS base film 5 and a background layer 4, a pattern texture layer 3, a touch texture layer 2, and a surface protection film 1 formed on the ABS base film 5 in sequence. The thickness of the ABS base film 5 is 250 μm, the thickness of the background layer 4 is 3 μm, the thickness of the pattern texture layer 3 is 5 μm, the thickness of the touch texture layer 2 is 80 μm, the texture depth of the touch texture layer 2 is 40 μm, and the thickness of the surface protection film 1 is 50 μm. The mass ratio of the main agent to the hardener in Toyokomei's Lioduras MOL8020M CN is 100:4.

[0053] The method for preparing a multilayer film having a surface tactile feel comprises the following steps: S1, using a gravure coating method, printing polymethacrylic acid resin and polyurethane resin in a mass ratio of 10:2 on an ABS base film 5 to form a background layer 4; S2, using a gravure coating method, printing methacrylic resin, polyurethane resin and pigment in a mass ratio of 10:2:1 on the background layer 4 to form a pattern texture layer 3; S3, adding the main agent into ethyl acetate for dilution to obtain a diluted main agent with a solid content of 35% and a viscosity of 100 mPa‧s; After the diluted main agent and the hardener are evenly mixed, they are printed on the pattern texture layer 3 by slot extrusion coating to form a coating with a background color. After pre-drying at 40°C for 5 days, the coating is embossed with a tactile texture roller with a texture depth of 40 μm, and then dried and cured at 60°C for 2 days to form a tactile texture layer 2. S4, using a laminating machine to cover the PE film on the touch texture layer 2 to form a surface protection film 1; rolling up to obtain a multi-layer film 10 with a surface touch.

[0054] Example 2 This embodiment provides a multilayer film with surface tactile sensation and a preparation method thereof.

[0055] See also Figure 1 In this embodiment, the multilayer film 10 with a surface touch feeling comprises an ABS base film 5 and a background layer 4, a pattern texture layer 3, a touch texture layer 2, and a surface protection film 1 sequentially formed on the ABS base film 5. The thickness of the ABS base film 5 is 300 μm, the thickness of the background layer 4 is 6 μm, the thickness of the pattern texture layer 3 is 5 μm, the thickness of the touch texture layer 2 is 100 μm, the texture depth of the touch texture layer 2 is 50 μm, and the thickness of the surface protection film 1 is 50 μm. The mass ratio of the main agent to the hardener in Toyokomei's Lioduras MOL8020M CN is 100:4.

[0056] The method for preparing a multilayer film having a surface tactile feel comprises the following steps: S1, using a gravure coating method, printing polymethacrylic acid resin and polyurethane resin in a mass ratio of 10:6 on an ABS base film 5 to form a background layer 4; S2, using a gravure coating method, printing methacrylic resin, polyurethane resin and pigment in a mass ratio of 10:6:2.4 on the background layer 4 to form a pattern texture layer 3; S3, adding the main agent into ethyl acetate for dilution to obtain a diluted main agent with a solid content of 40% and a viscosity of 150 mPa‧s; After the diluted main agent and the hardener are evenly mixed, they are printed on the pattern texture layer 3 by slot extrusion coating to form a coating with a background color. After pre-drying at 40°C for 4 days, the coating is embossed by a tactile texture roller with a texture depth of 50 μm, and then dried and cured at 60°C for 2 days to form a tactile texture layer 2. S4, using a laminating machine to cover the PE film on the touch texture layer 2 to form a surface protection film 1; rolling up to obtain a multi-layer film 10 with a surface touch.

[0057] Example 3 This embodiment provides a multilayer film with surface tactile sensation and a preparation method thereof.

[0058] See also Figure 1 In this embodiment, the multilayer film 10 with a surface touch feeling comprises an ABS base film 5 and a background layer 4, a pattern texture layer 3, a touch texture layer 2, and a surface protection film 1 sequentially formed on the ABS base film 5. The thickness of the ABS base film 5 is 400 μm, the thickness of the background layer 4 is 9 μm, the thickness of the pattern texture layer 3 is 4 μm, the thickness of the touch texture layer 2 is 60 μm, the texture depth of the touch texture layer 2 is 30 μm, and the thickness of the surface protection film 1 is 50 μm. The mass ratio of the main agent to the hardener in Toyokomei's Lioduras MOL8020M CN is 100:4.2.

[0059] The method for preparing a multilayer film having a surface tactile feel comprises the following steps: S1, using a slot extrusion coating method, printing polymethacrylic acid resin and polyurethane resin in a mass ratio of 10:8 on an ABS base film 5 to form a background layer 4; S2, using a gravure coating method, printing methacrylic resin, polyurethane resin and pigment in a mass ratio of 10:8:3.2 on the background layer 4 to form a pattern texture layer 3; S3, adding the main agent into ethyl acetate for dilution to obtain a diluted main agent with a solid content of 30% and a viscosity of 60 mPa‧s; After the diluted main agent and the hardener are evenly mixed, they are printed on the pattern texture layer 3 by slot extrusion coating to form a coating with a background color. After pre-drying at 35°C for 6 days, the coating is embossed by a tactile texture roller with a texture depth of 30 μm, and then dried and cured at 55°C for 3 days to form a tactile texture layer 2. S4, using a laminating machine to cover the PE film on the touch texture layer 2 to form a surface protection film 1; rolling up to obtain a multi-layer film 10 with a surface touch.

[0060] Example 4 This embodiment provides a multilayer film with surface tactile sensation and a preparation method thereof.

[0061] See also Figure 1In this embodiment, the multilayer film 10 with a surface touch feeling comprises an ABS base film 5 and a background layer 4, a pattern texture layer 3, a touch texture layer 2, and a surface protection film 1 formed on the ABS base film 5 in sequence. The thickness of the ABS base film 5 is 500 μm, the thickness of the background layer 4 is 12 μm, the thickness of the pattern texture layer 3 is 3 μm, the thickness of the touch texture layer 2 is 120 μm, the texture depth of the touch texture layer 2 is 60 μm, and the thickness of the surface protection film 1 is 50 μm. The mass ratio of the main agent to the hardener in Toyokomei's Lioduras MOL8020M CN is 100:3.8.

[0062] The method for preparing a multilayer film having a surface tactile feel comprises the following steps: S1, using a gravure coating method, printing polymethacrylic acid resin and polyurethane resin in a mass ratio of 10:5 on an ABS base film 5 to form a background layer 4; S2, using a gravure coating method, printing methacrylic resin, polyurethane resin and pigment in a mass ratio of 10:5:3.5 on the background layer 4 to form a pattern texture layer 3; S3, adding the main agent into ethyl acetate for dilution to obtain a diluted main agent with a solid content of 45% and a viscosity of 200 mPa‧s; After the diluted main agent and the hardener are evenly mixed, they are printed on the pattern texture layer 3 by slot extrusion coating to form a coating with a background color. After pre-drying at 45°C for 4 days, the coating is embossed with a tactile texture roller with a texture depth of 60 μm, and then dried and cured at 65°C for 1 day to form a tactile texture layer 2. S4, using a laminating machine to cover the PE film on the touch texture layer 2 to form a surface protection film 1; rolling up to obtain a multi-layer film 10 with a surface touch.

[0063] Comparative Example 1 This comparative example provides a method for preparing a multilayer film with a surface tactile feel (its structure and thickness of each layer are the same as those of Example 2), which is similar to Example 2, except that the raw material components of the tactile texture layer are replaced with dual-cured UV resin, polymethyl methacrylate resin particles with hydrophobic surface treatment, epoxy resin particles and silicon dioxide nanoparticles in a mass ratio of 100:8:5:3. Specifically, the following steps are included: S1~S2 are the same as those in Example 2 and will not be described in detail; S3, adding the raw material components of the tactile texture layer into ethyl acetate to obtain a mixture with a solid content of 40% and a viscosity of 150 mPa‧s; The mixed material is printed on the pattern texture layer 3 by slot extrusion coating to form a coating with a background color, and after pre-drying at 40° C. for 4 days, the coating is embossed by a tactile texture roller with a texture depth of 50 μm, and then dried and cured at 60° C. for 2 days to form a tactile texture layer 2; S4 is the same as in Example 2 and will not be described in detail.

[0064] Comparative Example 2 This comparative example provides a method for preparing a multilayer film with a surface tactile feel (its structure and thickness of each layer are the same as those of Example 2), which is similar to Example 2, except that the raw material components of the tactile texture layer are replaced with dual-cured UV resin and elastomer filler in a mass ratio of 5:1. Specifically, the following steps are included: S1~S2 are the same as those in Example 2 and will not be described in detail; S3, adding the raw material components of the tactile texture layer into ethyl acetate to obtain a mixture with a solid content of 40% and a viscosity of 150 mPa‧s; The mixed material is printed on the pattern texture layer 3 by slot extrusion coating to form a coating with a background color, and after pre-drying at 40° C. for 4 days, the coating is embossed by a tactile texture roller with a texture depth of 50 μm, and then dried and cured at 60° C. for 2 days to form a tactile texture layer 2; S4 is the same as in Example 2 and will not be described in detail.

[0065] Comparative Example 3 This comparative example provides a method for preparing a multilayer film with a surface tactile feel (its structure and thickness of each layer are the same as those of Example 2), which is similar to Example 2, except that the raw material components of the tactile texture layer are replaced with dual-cured UV resin, polystyrene resin particles, silicon dioxide nanoparticles and elastomer filler in a mass ratio of 100:10:3:5. Specifically, the following steps are included: S1~S2 are the same as those in Example 2 and will not be described in detail; S3, adding the raw material components of the tactile texture layer into ethyl acetate to obtain a mixture with a solid content of 40% and a viscosity of 150 mPa‧s; The mixed material is printed on the pattern texture layer 3 by slot extrusion coating to form a coating with a background color, and after pre-drying at 40° C. for 4 days, the coating is embossed by a tactile texture roller with a texture depth of 50 μm, and then dried and cured at 60° C. for 2 days to form a tactile texture layer 2; S4 is the same as in Example 2 and will not be described in detail.

[0066] Comparative Example 4 This comparative example provides a method for preparing a multilayer film with a surface tactile feel (its structure and thickness of each layer are the same as those of Example 2), which is similar to Example 2 and specifically includes the following steps: S1~S2 are the same as those in Example 2 and will not be described in detail; S3, adding the main agent into ethyl acetate for dilution to obtain a diluted main agent with a solid content of 40% and a viscosity of 150 mPa‧s; After the diluted main agent and the hardener are evenly mixed, they are printed on the pattern texture layer 3 by micro-gravure coating to form the tactile texture layer 2; S4 is the same as in Example 2 and will not be described in detail.

[0067] Application Example 1 This application example provides a method for using a multilayer film with a surface tactile feel, comprising the following steps: The multilayer film with a surface feel of Example 1 was molded at 15 MPa and 140° C. using a molding device, and then placed in an injection molding device, and molten polycarbonate and ABS in a mass ratio of 2:3 were filled under the ABS base film of the multilayer film, and cooled and shaped to obtain a molded workpiece.

[0068] Application Example 2 This application example provides a method for using a multilayer film with a surface tactile feel, comprising the following steps: The multilayer film with a surface feel of Example 2 was molded at 25 MPa and 123° C. using a molding device, and then placed in an injection molding device, and molten ABS was filled under the ABS base film of the multilayer film, and cooled to shape to obtain a molded workpiece.

[0069] Application Examples 3~4 Application Examples 3 and 4 respectively provide a method for using a multilayer film with a surface tactile feel, which is similar to Application Example 2, except that the multilayer film is replaced with the multilayer film with a surface tactile feel of Example 3 or Example 4. The remaining operations are the same as those of Application Example 2 and will not be described in detail.

[0070] Application Comparative Examples 1 to 4 Comparative Examples 1 to 4 respectively provide a method for using a multilayer film with a surface tactile feel, which is similar to Example 2, except that the multilayer film is replaced with the multilayer film with a surface tactile feel of Comparative Examples 1 to 4. The remaining operations are the same as Example 2 and will not be repeated.

[0071] Verification test 1. Roughness test The maximum peak-to-valley-to-peak-bottom values ​​(Rz) of the multilayer films with surface touch of Examples 1 to 4, Comparative Examples 1 to 4, and Example 1 of Patent CN115320193A and the formed workpieces of Application Examples 1 to 4, Application Comparative Examples 1 to 4, and Example 1 of Patent CN115320193A were measured by a roughness tester, and the test results are shown in Table 1.

[0072] Table 1 Roughness test results of multilayer films and molded workpieces

[0073] 2. Evaluate physical properties (1) Test method for tactile properties The feeling of contact with the human hand was evaluated according to the following criteria.

[0074] ① Overall touch ○: There is a clear touch.

[0075] △: There is a slight touch.

[0076] ╳: Almost no touch.

[0077] ②Concave and convex touch ○: The shape of each protrusion is distinct and has concave and convex details.

[0078] △: There is slight unevenness.

[0079] ╳: No obvious feeling.

[0080] ③Touch elasticity ○: There is an obvious indentation on the surface after pressing, and the surface recovers slowly.

[0081] △: The surface feels elastic when pressed.

[0082] ╳: No noticeable change when pressing on the surface.

[0083] Table 2 Test results of tactile properties of multilayer films and molded workpieces

[0084] (2) Physical and processing performance test methods High and low temperature cycle resistance test method: Use the following temperature cycle to test the molded workpiece: -35℃±2℃, 5h→23℃±2℃, (50±3)%RH, 0.5h→high temperature condition (90℃), 5h→23℃±2℃, (50±3)%RH, 0.5h→50℃±2℃, (95±3)%RH, 2h→23℃±2, (50±3)%RH, after 0.5h, repeat the sequence again to end.

[0085] Heat aging resistance test method: Place the molded workpiece in a 90℃ high temperature oven for 168h, place it at room temperature for 2h, and then evaluate the appearance and color change.

[0086] Light aging resistance test method: Test according to SAE J2412, irradiation amount 1240kJ / m 2 Test the formed workpiece.

[0087] After the above tests are completed, the appearance and adhesion are evaluated respectively. The appearance is evaluated by visual inspection, and the adhesion is tested by the 100-grid method. The evaluation criteria are as follows: Appearance evaluation criteria: ○: After the test, there are no wrinkles on the surface of the film; no cracks, breaks, whitening, peeling, or swelling on the appearance; no fading of color or gloss change; no blurring, stickiness, or fading on the surface; and no stains on the effective surface; ╳: After the test, wrinkles appear on the surface of the membrane or the appearance is cracked, broken, whitened, peeled, and swollen; the color fades and the gloss changes; the surface state is blurred, sticky, and fades when wiped, and stains appear on the effective surface.

[0088] Adhesion evaluation criteria: ○: 100-grid method, 3M610 tape, make the tape stick to the surface of the molded workpiece sample without bubbles, and then quickly tear off the tape along the surface of the component at a 45° angle without falling off; ╳: Hundred-grid method, 3M610 tape, make the tape stick to the surface of the molded workpiece sample without bubbles, then quickly tear off the tape along the surface of the component at a 45° angle, and one or more small grids will fall off.

[0089] Table 3 Physical and processing properties test results of molded workpieces

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multilayer film having a surface feel, characterized in that: It includes an ABS base film and a background layer, a pattern texture layer, a tactile texture layer, and a surface protection film sequentially formed on the ABS base film; The raw material components of the tactile texture layer include a two-component coating material, and the two-component coating material includes a main agent and a hardener.

2. The multilayer film having a surface tactile feel according to claim 1, characterized in that: The mass ratio of the main agent to the hardener is 100:(3.8-4.2); The main agent includes at least one of polyester polyurethane or acrylic polyurethane, and the hardener includes at least one of hexamethylene diisocyanate or isophorone diisocyanate.

3. The multilayer film having a surface feel according to claim 1 or 2, characterized in that: The two-component coating material is Lioduras MOL8020M CN produced by Toyokomei.

4. The multilayer film having a surface tactile feel according to claim 1, wherein: The thickness of the tactile texture layer is 60 μm to 125 μm; The texture depth of the tactile texture layer is 30 μm to 60 μm; The thickness of the ABS base film is 250 μm to 500 μm; The thickness of the background layer is 3 μm to 12 μm; The thickness of the pattern texture layer is 1 μm to 5 μm; The thickness of the surface protection film is 30 μm to 60 μm.

5. The multi-layer film having a surface tactile feeling according to claim 1, characterized in that: The raw material components of the background layer include polymethacrylic acid resin and polyurethane resin in a mass ratio of 10:(2-8); The raw material components of the pattern texture layer include polymethacrylic acid resin, polyurethane resin and pigment in a mass ratio of 10:(2-8):(0.9-3.6); The material of the surface protection film is polyethylene.

6. The method for preparing a multilayer film having a surface feel according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, printing a background layer on an ABS base film, and printing a pattern texture layer on the background layer; S2, printing a two-component coating material on the pattern texture layer to form a coating with a background color, and after pre-drying, embossing the coating with a tactile texture roller, and after drying and curing, obtaining a tactile texture layer on the pattern texture layer; S3, covering the tactile texture layer with a surface protection film, and rolling up to obtain a multilayer film with a surface tactile feel.

7. The method for preparing a multilayer film having a surface tactile feel according to claim 6, characterized in that: In S2, the main agent of the two-component coating material is first added to a solvent for dilution, the diluted main agent is mixed with the hardener of the two-component coating material, and then the printing is performed by slit extrusion coating.

8. The method for preparing a multilayer film having a surface tactile feel according to claim 7, wherein: In S2, the solvent is ethyl acetate; In S2, the solid content of the diluent main agent is 30% to 45%, and the viscosity is 60mPa‧s to 200mPa‧s.

9. The method for preparing a multilayer film having a surface tactile feel according to claim 6, wherein: In S2, the pre-drying temperature is 35°C to 45°C, and the pre-drying time is 4d to 6d; In S2, the drying and curing temperature is 55°C to 65°C, and the drying and curing time is 1 day to 3 days.

10. A method for using the multilayer film with a surface feel according to any one of claims 1 to 5 or the multilayer film with a surface feel obtained by the method for preparing the multilayer film with a surface feel according to any one of claims 6 to 9, characterized in that: The following steps are involved: The multilayer film with a surface tactile feel is molded at 10MPa~30MPa and 120℃~140℃ using a molding device, and then placed in an injection molding device, and a molten plastic workpiece is filled under the ABS base film of the multilayer film with a surface tactile feel, and cooled and shaped to obtain a molded workpiece.

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