Indented pattern color scraping decorative film and preparation method thereof

Abstract

The invention relates to the field of decorative films, in particular to an indented pattern color scraping decorative film and a preparation method thereof.The indented pattern color scraping decorative film comprises a skin feeling functional layer, a pattern developing layer, a supporting strengthening layer and a coloring strengthening layer, the skin feeling functional layer, the pattern developing layer and the supporting strengthening layer are composited into an integrated structure through hot pressing, and micron-sized air guide grooves are formed in the bonding faces of all the layers; the air guide grooves are arranged in parallel along the extending direction of the dimpled grains, the 60-degree glossiness of the surface of the decorative film is less than 3GU, the pencil hardness is greater than 1H, and the texture spacing difference between the outline edge of the dimpled grains and the printed pattern layer is 0.1-0.5 mm, so that the decorative film is endowed with excellent stereoscopic visual effect and physical property. The dimpled grain structure in the skin-touch functional layer is directly formed on the surface of the skin-touch coating, the problem of interlayer dislocation caused by traditional composite embossing is avoided, it is ensured that the dimpled grain outline is clear, the peeling strength between layers is high, bonding is tighter, and no bubble is left on the bonding face between the layers.

Description

Technical Field

[0001] The present invention relates to the field of decorative films, and particularly to a concave embossed scraping color decorative film and a preparation method thereof. Background Art

[0002] In the fields of home decoration and industrial decoration, PVC-based decorative films are widely used as surface coatings for ceiling, wall panel, cabinet surface, floor surface layer and other decorative materials. Such decorative films need to have both aesthetic appearance, wear resistance and environmental protection. They should not only simulate the texture of natural stone, wood grain and other materials, but also meet the requirements of industrial production. Traditional decorative films mostly adopt a single-layer printing combined with surface embossing process, or achieve basic functions through a multi-layer composite structure, but there are obvious limitations in the presentation of three-dimensional effects, interface bonding strength and surface durability.

[0003] 1. The following defects exist in the design of the existing decorative film in the layered composite structure: In the traditional embossing process, due to the difference in thermal shrinkage rate of each layer of materials in the composite film layer, it is easy to cause the embossing contour to be blurred or the interlayer dislocation, affecting the three-dimensional effect. The printed pattern and the embossing are easy to overlap, causing visual chaos and affecting the appearance of the decorative film. Bubbles are easily left during the composite process, reducing the interlayer bonding strength. The bubbles expand at high temperature, easily causing deformation.

[0004] 2. The following defects exist in the traditional process of manufacturing decorative films: The embossing process is usually carried out after the coating is completely cured. High-temperature embossing is easy to cause the coating to soften and deform, with poor consistency and low quality of the concave pattern depth. The composite process mostly adopts one-time high-temperature and high-pressure forming, and bubbles are easy to appear between layers, with insufficient interlayer bonding strength. The surface treatment process is single, the color ink filling rate is low and the bonding with the substrate is not firm. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art solutions, the present invention provides a concave embossed scraping color decorative film, which can effectively solve the technical problems of unclear embossing and easy generation of bubbles inside.

[0006] The technical solution adopted by the present invention to solve its technical problems is:

[0007] A concave embossed scraping color decorative film includes the following structural layers:

[0008] Skin-friendly functional layer: It is composed of a transparent PVC film and a skin-friendly coating. The transparent PVC film is directly coated on the surface of the transparent PVC film. A continuous concave pattern with a depth of 0.1 - 0.5 mm is formed on the side of the skin-friendly coating away from the transparent PVC film through an embossing process;

[0009] Pattern developing layer: It is composed of a PVC base film and a printed pattern. The PVC base film is arranged below the skin-friendly functional layer. The printed pattern forms a basic decorative texture on the surface of the PVC base film through intaglio printing. The texture of the printed pattern and the trend of the concave pattern are arranged non-overlappingly, and the plane projection distance between the two is 0.1 - 0.8 mm;

[0010] Support and strengthening layer: It includes a rigid PVC substrate layer. The rigid PVC substrate layer is located below the pattern developing layer, and its Shore hardness is 70 - 90 HA;

[0011] Coloring and enhancing layer: It is composed of a UV-curable ink layer filled in the concave pattern. There is a transition zone with a thickness of 0.01 - 0.05 mm on the side wall of the concave pattern. The UV-curable ink layer filled in the transition zone forms a gradient edge, and the surface of the ink layer is 0.05 - 0.2 mm lower than the plane of the skin-friendly coating;

[0012] The skin-friendly functional layer, the pattern developing layer and the support and strengthening layer are thermally pressed and compounded to form an integrated structure. Microscopic air guide grooves are provided on the bonding surface of each layer. The air guide grooves are arranged in parallel along the extension direction of the concave pattern. The 60° glossiness of the surface of the decorative film is less than 3 GU, the pencil hardness is greater than 1H, and the contour edge of the concave pattern and the texture spacing difference of the printed pattern layer are 0.1 - 0.5 mm.

[0013] Furthermore, the support and strengthening layer further includes a foamed PVC intermediate layer. The foamed PVC intermediate layer is located between the rigid PVC substrate layer and the transparent PVC face film. The foaming ratio of the foamed PVC intermediate layer is 1.5 - 3 times, and the thickness is 0.2 - 0.6 mm.

[0014] Furthermore, a flame retardant is added to the foamed PVC intermediate layer. The flame retardant is a compound of aluminum hydroxide and a phosphorus-based flame retardant, and the addition amount is 15 - 25 wt%.

[0015] Furthermore, the skin-friendly coating is made of organosilicon-modified polyurethane resin, and its surface is treated by electron beam irradiation to form a microporous structure. The micropore diameter is 5 - 20 μm, and the porosity is 15 - 30%.

[0016] Furthermore, an anti-ultraviolet functional layer is provided on the surface of the skin-friendly functional layer. It is made of a composite of nano-titanium dioxide and fluorocarbon resin, with a thickness of 2 - 8 μm, and the ultraviolet ray blocking rate is greater than 95%.

[0017] In order to overcome the deficiencies of the prior art solutions, the present invention provides a preparation method of a concave embossed scraping color decorative film, which can effectively solve the technical problems of unclear embossing and insufficient bonding strength.

[0018] The technical solution adopted by the present invention to solve its technical problems is:

[0019] A preparation method of a concave embossed scraping color decorative film for producing a concave embossed scraping color decorative film, comprising the following steps:

[0020] Step S1: Coating a skin-friendly coating on the surface of a transparent PVC base film, pre-curing at 80 - 120 °C to form a semi-cured coating, and immediately pressing concave patterns on the surface of the coating through a embossing roller, with the embossing depth being 0.1 - 0.5 mm and the temperature of the embossing roller being controlled at 50 - 70 °C;

[0021] Step S2: Printing a pattern layer on the surface of the PVC base film, using a double-station printing machine to first coat the base color ink and then superpose and print the embossed ink to form a three-dimensional developed texture;

[0022] Step S3: Laminating the skin-friendly functional layer, the pattern developed layer and the rigid PVC substrate layer, and performing compounding in two stages in a hot press:

[0023] The first stage: pre-pressing for 10 - 20 seconds under the conditions of 120 - 140 °C and 2 - 4 MPa to initially form the air guide grooves; the second stage: heating to 170 - 200 °C, pressurizing to 8 - 15 MPa and maintaining for 30 - 90 seconds to complete the melting and bonding;

[0024] Step S4: Using an angled scraper to embed the color ink into the concave patterns with a pressure of 0.3 - 0.8 MPa, and immediately irradiating and curing with a 365 nm UV light source after scraping, with the energy density being 800 - 1500 mJ / cm 2 ;

[0025] Step 5: Spraying a hydrophobic treatment agent on the surface of the scraped skin-friendly coating, and drying with hot air at 60 - 80 °C to form a nano-hydrophobic film;

[0026] Step S6: Performing electron beam extinction treatment on the surface of the composite film, with an irradiation dose of 80 - 200 kGy to form a low-gloss surface of less than 3 GU.

[0027] Further, in step S1, the curing degree of the pre-cured coating is 40 - 60%, the linear pressure of the embossing roller is 50 - 120 N / cm, and it is immediately cooled to 5 - 10 °C for shaping by spraying liquid nitrogen after embossing.

[0028] Further, in step S5, the hydrophobic treatment agent is a perfluoroalkyl siloxane solution, and the spraying thickness is 0.5 - 2.0 μm.

[0029] Further, in step S3, the air guide grooves 7 are formed by die pressing with a pressing plate with a convex structure, the ratio of the convex height to the depth of the air guide grooves is 1:1.2 - 1.5, and the die pressing pressure is 3 - 6 MPa.

[0030] Furthermore, in step S4, the beveled blade edge of the scraper is provided with a wavy microstructure of 0.1 - 0.3 mm, which generates periodic pressure fluctuations during ink scraping, and the fluctuation amplitude is ±15% - 25%.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] 1. Through the layered composite design of the skin - feeling functional layer, pattern developing layer, support strengthening layer, and coloring enhancement layer, the decorative film is endowed with excellent three - dimensional visual effects and physical properties. The concave patterns in the skin - feeling functional layer are directly formed on the surface of the skin - feeling coating, avoiding the interlayer dislocation problem caused by traditional composite embossing and ensuring clear concave pattern contours. The pattern developing layers are arranged non - overlappingly, making the direction of the concave patterns form a spatial complementarity with the printed texture and significantly enhancing the three - dimensional simulation effect. The micron - level air - guiding grooves provided on the bonding surfaces of each layer effectively discharge the interlayer gas during the hot - pressing composite process, reducing the defect of bubble residue, improving the bonding strength between layers, and at the same time avoiding the deformation of the concave patterns caused by gas expansion during high - temperature composite. The transition zone and the gradient edge formed by the UV - cured color ink layer are provided on the side wall of the concave pattern, enabling the natural transition between the color ink layer and the side wall of the concave pattern, making the appearance of the concave pattern more comfortable and eliminating the boundary burr problem of the traditional scraping process.

[0033] 2. By embossing immediately after pre - curing to form a semi - cured coating and combined with the temperature control of the embossing roller, not only can the consistency of the concave pattern depth be ensured, but also the over - softening of the coating caused by high - temperature embossing can be avoided, improving the embossing forming efficiency. Through the two - stage composite process, the skin - feeling functional layer, pattern developing layer, and rigid PVC substrate layer are laminated. The gradient heating and pressurizing method enables the air - guiding grooves to be further melted and combined after being initially formed, with high peel strength between layers, closer combination, and no bubble residue on the bonding surface between layers. First, the base color ink is coated, and then the embossed ink is printed in an overlay manner. Through double - station printing to enhance three - dimensional development and combined with rapid curing by UV light source, the color ink filling rate is high and the curing time is short, effectively improving production efficiency. Through the synergistic effect of spraying nano - hydrophobic thin film and electron beam extinction treatment, the surface of the decorative film has both low - gloss matte texture and anti - fingerprint pollution performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0035] Figure 2 It is a schematic structural diagram of Embodiment 2 of the present invention;

[0036] Reference numerals in the figure: 1 - skin - feeling coating, 2 - transparent PVC face mask, 3 - PVC base film, 4 - rigid PVC substrate layer, 5 - color ink layer, 6 - concave pattern, 7 - anti - ultraviolet functional layer, 8 - foamed PVC intermediate layer. DETAILED DESCRIPTION OF THE INVENTION

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] Embodiment 1

[0039] This embodiment provides a concave embossed scraping color decorative film and a preparation method thereof, specifically as follows:

[0040] A concave embossed scraping color decorative film includes a transparent PVC surface film 2, a skin-friendly coating 1, a PVC base film 3, and a rigid PVC substrate layer 4.

[0041] The transparent PVC surface film 2 is directly coated on the surface of the transparent PVC surface film 2. A continuous concave pattern 6 with a depth of 0.2 mm is formed on the side of the skin-friendly coating 1 away from the transparent PVC surface film 2 through a embossing process. The PVC base film 3 is arranged below the skin-friendly functional layer. The printed pattern forms a basic decorative texture on the surface of the PVC base film 3 through gravure printing, and the texture of the printed pattern is arranged non-overlapping with the trend of the concave pattern 6, and the plane projection distance between the two is 0.6 mm. The rigid PVC substrate layer 4 is located below the pattern developing layer, and its Shore hardness is 70 HA. The concave pattern 6 is filled with a UV-curable ink layer 5. A transition zone with a thickness of 0.03 mm is provided on the side wall of the concave pattern 6. The UV-curable ink layer 5 filled in the transition zone forms a gradient edge, and the surface of the ink layer 5 is 0.1 mm lower than the plane of the skin-friendly coating 1.

[0042] The skin-friendly functional layer, the pattern developing layer, and the support strengthening layer are thermally pressed and compounded to form an integrated structure. Microscopic air guide grooves are provided on the bonding surfaces of each layer, and the air guide grooves are arranged in parallel along the extending direction of the concave pattern 6. The 60° glossiness of the decorative film surface is 2.6 GU, and the pencil hardness is 2H. The contour edge of the concave pattern 6 and the texture spacing of the printed pattern layer differ by 0.1 mm.

[0043] The preparation method includes the following steps:

[0044] Step S1, coat a skin-friendly coating on the surface of the transparent PVC base film 3. After pre-curing at 100 °C to form a semi-cured coating, immediately press the concave pattern 6 on the surface of the coating through an embossing roller. The embossing depth is 0.5 mm, the temperature of the embossing roller is controlled at 68 °C, and the curing degree of the semi-cured coating is 50%-54%;

[0045] Step S2, print a pattern layer on the PVC base film 3. Use a double-station printing machine to first coat the base color ink, and then superimpose and print the relief ink to form a three-dimensional developing texture;

[0046] Step S3: Stack the skin-friendly functional layer, the pattern developing layer, and the rigid PVC substrate layer 4, and laminate them in two stages in a hot press:

[0047] First stage: Pre-press for 15 seconds at 130°C and 3.2 MPa to initially form the air guide grooves with a groove depth of 25 μm and a width of 0.15 mm.

[0048] Second stage: Raise the temperature to 185°C, increase the pressure to 10.5 MPa, and hold for 60 seconds to complete the melt bonding, with a peel strength greater than 11.5 N / mm.

[0049] Step S4: Use an angled squeegee to embed the color ink into the concave grooves 6 at a pressure of 0.3 - 0.8 MPa. The inclination angle of the angled squeegee is 50°. Immediately after scraping the ink, irradiate and cure it with a 365 nm UV light source, with an energy density of 1200 mJ / cm 2 , a curing time of 4 seconds, a color ink filling rate greater than 99.2%, and an adhesion force reaching 5B.

[0050] Step 5: Spray a hydrophobic treatment agent on the surface of the skin-friendly coating 1 after scraping the color, and dry it with hot air at 60 - 80°C to form a nano-hydrophobic film with a thickness of 1.1 μm.

[0051] Step S6: Perform electron beam matting treatment on the surface of the composite film, with an irradiation dose of 155 kGy and a surface glossiness less than 60° of 2.6 GU.

[0052] Example 2

[0053] This example provides a concave-patterned color-scraped decorative film and its preparation method, which are as follows:

[0054] A concave-patterned color-scraped decorative film includes a transparent PVC surface film 2, a skin-friendly coating 1, a PVC base film 3, a rigid PVC substrate layer 4, a foamed PVC intermediate layer 8, and an anti-ultraviolet functional layer 7.

[0055] The transparent PVC surface film 2 is directly coated on the surface of the transparent PVC surface film 2. On the side of the skin-friendly coating 1 away from the transparent PVC surface film 2, continuous concave grooves 6 with a depth of 0.2 mm are formed by a embossing process. The PVC base film 3 is arranged below the skin-friendly functional layer. The printed pattern forms a basic decorative texture on the surface of the PVC base film 3 by gravure printing, and the texture of the printed pattern and the trend of the concave grooves 6 are arranged non-overlappingly, with a planar projection distance of 0.6 mm between the two. The rigid PVC substrate layer 4 is located below the pattern developing layer, with a Shore hardness of 70 HA. The concave grooves 6 are filled with a UV-cured color ink layer 5. There is a 0.03 mm transition zone on the side wall of the concave grooves 6, and the UV-cured color ink layer 5 filled in the transition zone forms a gradient edge, and the surface of the color ink layer 5 is 0.1 mm lower than the plane of the skin-friendly coating 1.

[0056] The foamed PVC intermediate layer 8 is located between the rigid PVC substrate layer 4 and the transparent PVC face mask 2. The foaming ratio of the foamed PVC intermediate layer 8 is 2.1 times, the thickness is 0.42 mm, the bending resilience rate is 92.5%, and it is suitable for covering curved surfaces with a radius greater than 50 mm. A flame retardant is added to the foamed PVC intermediate layer, and the flame retardant is a compound of aluminum hydroxide and a phosphorus-based flame retardant, and the addition amount is 21 wt%.

[0057] The skin-friendly functional layer, the pattern developing layer and the support strengthening layer are thermally pressed and compounded to form an integrated structure. Micron-level air guide grooves are provided on the bonding surfaces of each layer, and the air guide grooves are arranged in parallel along the extension direction of the concave pattern 6. The 60° gloss of the decorative film surface is 2.6 GU, the pencil hardness is 2H, and the texture spacing difference between the contour edge of the concave pattern 6 and the printed pattern layer is 0.1 mm.

[0058] The preparation method includes the following steps:

[0059] Step S1, coat the skin-friendly coating on the surface of the transparent PVC base film 3. After pre-curing at 100 °C to form a semi-cured coating, immediately press the concave pattern 6 on the surface of the coating through a embossing roller. The embossing depth is 0.5 mm, the temperature of the embossing roller is controlled at 68 °C, the curing degree of the semi-cured coating is 50%-54%, and immediately cool it to 10 °C for shaping with liquid nitrogen spraying after embossing;

[0060] Step S2, print the pattern layer on the surface of the PVC base film 3. First coat the background ink with a double-station printing machine, and then superimpose and print the relief ink to form a three-dimensional marble texture. The thickness of the background ink is 10 μm, and the thickness of the relief ink is 18 μm;

[0061] Step S3, laminate the skin-friendly functional layer, the pattern developing layer and the rigid PVC substrate layer 4, and compound them in two stages in a hot press:

[0062] The first stage: pre-press for 15 seconds at 130 °C and 3.2 MPa to initially form the air guide grooves. The groove depth is 25 μm, the width is 0.15 mm, and the vibrating pressure plate is used to mold the air guide grooves with a frequency of 110 Hz and an amplitude of 0.32 mm;

[0063] The second stage: raise the temperature to 185 °C, increase the pressure to 10.5 MPa and maintain for 60 seconds to complete the melt bonding, and the peel strength is greater than 11.5 N / mm;

[0064] Step S4, embed the color ink into the concave pattern 6 with a beveled scraper at a pressure of 0.3-0.8 MPa. The inclination angle of the beveled scraper is 50°. Immediately irradiate and cure with a 365 nm UV light source after scraping the ink, and the energy density is 1200 mJ / cm 2, the curing time is 4 seconds, the color ink filling rate is greater than 99.2%, the adhesion reaches 5B, the distance between the printed pattern layer and the concave pattern 6 is 0.32 mm, the optical interference effect produces dynamic color changes, and the edge of the beveled scraping blade is provided with a wavy microstructure of 0.18 mm, generating periodic pressure fluctuations during ink scraping, with a fluctuation amplitude of ±22%;

[0065] Step 5, spray a hydrophobic treatment agent on the surface of the skin-friendly coating 1 after scraping the color, and form a nano-hydrophobic film through hot air drying at 60 - 80 °C, with the thickness of the nano-hydrophobic film being 1.1 μm;

[0066] Step S6, perform electron beam extinction treatment on the surface of the composite film, with an irradiation dose of 155 kGy and a surface glossiness less than 60° of 2.6 GU.

[0067] In a concave embossed color scraping decorative film and its preparation method of this embodiment, the temperature of the embossing roller is controlled at 68 °C ± 2 °C, which not only ensures the softening degree of the coating to reduce the embossing resistance, but also immediately adopts liquid nitrogen spraying for cooling after embossing, enabling the semi-cured coating to be quickly shaped within 1 - 2 seconds, avoiding the concave pattern rebound deformation caused by thermal relaxation, shortening the cooling time, significantly improving the production efficiency, adding a foamed PVC intermediate layer 8 and an anti-ultraviolet functional layer 7. The foamed PVC intermediate layer 8 makes the decorative film have an excellent elastic recovery rate, is suitable for covering curved substrates, and avoids cracks or delamination caused by bending of traditional rigid materials. The impact resistance strength is increased to 15 - 25 kJ / m 2 , the compression set rate ≤ 5%, can withstand long-term dynamic loads, such as the surface of frequently opened and closed cabinet doors. The foamed intermediate layer 8 can absorb the interlayer stress during the hot pressing and lamination process, reduce the warping deformation caused by the temperature gradient, and improve the dimensional stability of large-scale production. The ultraviolet protection layer 7 can isolate UVB / UVA radiation, inhibit the photodegradation of ink pigments, avoid the texture deterioration caused by fading of traditional decorative films, and the service life is extended by 3 - 5 times compared with ordinary decorative films. The foamed PVC intermediate layer 8 is added with a flame retardant and is suitable for scenarios such as sunrooms and outdoor curtain walls.

[0068] Example 3

[0069] This embodiment provides a concave embossed color scraping decorative film and its preparation method, which are as follows:

[0070] A concave embossed color scraping decorative film includes a transparent PVC face film 2, a skin-friendly coating 1, a PVC base film 3, a rigid PVC substrate layer 4, a carbon fiber reinforced layer, and an anti-ultraviolet functional layer.

[0071] The thickness of the transparent PVC face film 2 is 0.28 mm. The skin-friendly coating 1 is directly coated on the surface of the transparent PVC face film 2 and is made of a polyurethane-silicone composite resin with a thickness of 35 μm. The surface thereof forms a U-shaped concave pattern 6 with a depth of 0.25 mm through an embossing process. The bottom width of the concave pattern 6 is 0.6 mm, and the spacing is 1.8 mm.

[0072] The PVC-based film 3 has a thickness of 0.18 mm, with a gravure-printed geometric texture pattern on the surface. The thickness of the base-color ink is 12 μm, and the thickness of the relief ink is 20 μm. The planar projection distance between the printed texture and the concave pattern 6 is 0.4 mm, forming optical interference fringes.

[0073] The rigid PVC substrate layer 4 has a thickness of 0.58 mm and a Shore hardness of 82 HA. An anti-slip diamond-shaped bump array is provided on the bottom surface. The height of the anti-slip diamond-shaped bumps is 0.4 mm, the side length is 1.2 mm, and the spacing is 2.5 mm. The static friction coefficient is 0.68. The carbon fiber reinforced layer is located between the rigid PVC substrate layer 4 and the foaming layer, with a thickness of 0.15 mm. The length of the chopped carbon fibers is 1.2 mm, and the volume ratio is 8%. The tensile strength is increased to 45 MPa.

[0074] The concave pattern 6 is filled with UV-curable gradient ink. The UV-curable gradient ink is mixed with two or more colors. The air guide grooves on the bonding surface of each layer are arranged in a honeycomb pattern. The depth of the air guide grooves is 30 μm, the width is 0.12 mm, and the spacing is 0.8 mm. After hot-pressing and laminating, the interlayer peel strength is 12.8 N / mm, and the pencil hardness is 2H.

[0075] The preparation method includes the following steps:

[0076] Step S1, coat a skin-friendly coating on the surface of the transparent PVC-based film 3. The viscosity of the skin-friendly coating is 1400 cps, and it is pre-cured at 105 °C to a curing degree of 58%. Use a laser engraving embossing roller with a power of 50 W and a linear speed of 2 m / min to press the concave pattern 6. The embossing depth is 0.25 mm, the roller temperature is 75 °C, and after embossing, it is rapidly cooled to 5 °C with liquid nitrogen, and the cooling rate is 60 °C / s. The R value of the edge of the concave pattern 6 is ≤0.008 mm, the surface roughness Ra = 2.2 μm, and the tactile damping coefficient is 0.35.

[0077] Step S2, use a three-station printing machine:

[0078] In the first station, coat conductive ink with a thickness of 8 μm and a surface resistance of 1×10 3 Ω / □;

[0079] In the second station, print a geometric relief pattern with UV ink containing ceramic particles, with a thickness of 20 μm;

[0080] In the third station, spray an antistatic coating with a thickness of 3 μm and a surface resistance of 1×10 6 Ω / □.

[0081] The electrostatic decay time is ≤0.5 s, suitable for clean room environments.

[0082] Step S3, laminate and composite:

[0083] The first stage: pre-press at 135 °C and 4.5 MPa for 18 s, vibrate the pressing plate, with a frequency of 150 Hz and an amplitude of 0.25 mm to form a honeycomb air guide groove;

[0084] The second stage: final press at 195 °C and 12 MPa for 75 s for interfacial melt bonding.

[0085] The thermal conductivity is increased to 0.85 W / (m·K), which is suitable for coating heat-generating substrates.

[0086] Step S4, adopt a two-stage ink scraping system:

[0087] The first-stage flat-edge squeegee, with a squeegee pressure of 0.7 MPa, fills with luminous color ink;

[0088] The second-stage electromagnetic oscillation squeegee, with an oscillation frequency of 200 Hz and an amplitude of 0.1 mm, compacts the color ink, and the UV curing energy density is 1400 mJ / cm 2 .

[0089] Step 5, spray a hydrophobic treatment agent on the surface of the feel coating 1 after scraping the color, and form a nano-hydrophobic film by hot air drying at 60 - 80 °C, with the thickness of the nano-hydrophobic film being 1.1 μm;

[0090] Step S6, perform electron beam matting treatment on the surface of the composite film, with an irradiation dose of 155 kGy and a surface glossiness less than 60° of 2.6 GU.

[0091] In a dented pattern ink scraping decorative film and its preparation method according to this embodiment, the addition of short carbon fibers increases the tensile strength to 45 MPa, which is 200% higher than that of the pure PVC substrate. At the same time, the density only increases by 5%, from a density of 1.42 g / cm 3 It is increased to 1.49 g / cm 3 , achieving the characteristics of high strength and light weight, and is suitable for large-span decorative plates, such as suspended ceilings. The UV-cured gradient color ink can obtain more realistic patterns, such as marble, jade and other patterns.

[0092] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A decorative film with embossed patterns and scratched colors, characterized in that: The following structural layers are included: Skin-feeling functional layer: It is composed of a transparent PVC mask and a skin-feeling coating. The transparent PVC mask is directly coated on the surface of the transparent PVC mask. The skin-feeling coating is embossed on the side away from the transparent PVC mask to form continuous grooves with a depth of 0.1-0.5mm. Pattern developing layer: It is composed of a PVC base film and a printed pattern. The PVC base film is arranged below the skin-feeling functional layer. The printed pattern is formed on the surface of the PVC base film by gravure printing to form a basic decorative texture. The texture of the printed pattern and the direction of the concave pattern are arranged non-overlappingly, and the plane projection distance between the two is 0.1-0.8mm. Support reinforcement layer: including a hard PVC substrate layer, which is located below the pattern developing layer and has a Shore hardness of 70-90HA; Color enhancement layer: It is composed of a UV curing ink layer filled in the concave grooves, and a transition zone of 0.01-0.05mm is provided on the side wall of the concave grooves. The UV curing ink layer filled in the transition zone forms a gradient edge, and the surface of the ink layer is 0.05-0.2mm lower than the plane of the skin-feel coating; The skin-feeling functional layer, pattern developing layer and supporting reinforcement layer are hot-pressed to form an integrated structure. The bonding surfaces of each layer are provided with micron-level air guide grooves, which are arranged parallel to the extension direction of the grooves. The 60° glossiness of the decorative film surface is less than 3GU, the pencil hardness is greater than 1H, and the texture spacing difference between the contour edge of the groove and the printed pattern layer is 0.1-0.5mm.

2. The embossed pattern scratched decorative film according to claim 1, characterized in that: The supporting and reinforcing layer also includes a foamed PVC middle layer, which is located between the hard PVC substrate layer and the transparent PVC mask. The foaming ratio of the foamed PVC middle layer is 1.5-3 times, and the thickness is 0.2-0.6 mm.

3. The embossed pattern scratched decorative film according to claim 2, characterized in that: The foamed PVC middle layer is added with a flame retardant, which is a compound of aluminum hydroxide and a phosphorus-based flame retardant, and the added amount is 15-25wt%.

4. The embossed pattern scratched decorative film according to any one of claims 1 to 3, characterized in that: The skin-feel coating is made of organosilicon-modified polyurethane resin, and its surface is treated by electron beam irradiation to form a microporous structure with a micropore diameter of 5-20 μm and a porosity of 15-30%.

5. The embossed pattern scratched decorative film according to any one of claims 1 to 3, characterized in that: The anti-ultraviolet functional layer is arranged on the surface of the skin-feeling functional layer. The anti-ultraviolet functional layer is made of nano-titanium dioxide and fluorocarbon resin, has a thickness of 2-8 μm, and has an ultraviolet blocking rate of more than 95%.

6. A method for preparing an embossed pattern scraped decorative film, used for producing the embossed pattern scraped decorative film according to claim 1, characterized in that: The following steps are involved: Step S1: applying a skin-feel coating on the surface of a transparent PVC base film, pre-curing at 80-120° C. to form a semi-cured coating, and then immediately pressing a concave pattern on the coating surface with an embossing roller, the embossing depth being 0.1-0.5 mm, and the temperature of the embossing roller being controlled at 50-70° C.; Step S2: Printing a pattern layer on the surface of the PVC base film, using a double-station printing machine to first apply a base color ink, and then superimpose and print a relief ink to form a three-dimensional development texture; Step S3: Laminating the skin-feeling functional layer, the pattern developing layer and the hard PVC substrate layer in a hot press in two stages: The first stage: pre-pressing for 10-20 seconds at 120-140℃ and 2-4MPa to initially shape the air guide groove; The second stage: heating to 170-200℃, pressurizing to 8-15MPa and maintaining for 30-90 seconds to complete melt bonding; Step S4: Use an angled scraper to embed the color ink into the concave pattern at a pressure of 0.3-0.8 MPa. Immediately after scraping the ink, irradiate with a 365nm UV light source for curing at an energy density of 800-1500mJ / cm 2 ; Step 5: Spray a hydrophobic treatment agent on the surface of the skin-feel coating after coloring, and dry it with hot air at 60-80°C to form a nano hydrophobic film; Step S6: The surface of the composite film is subjected to electron beam extinction treatment with an irradiation dose of 80-200 kGy to form a low gloss surface less than 3 GU.

7. The method for preparing a decorative film with an embossed pattern and scratched color according to claim 6, characterized in that: In step S1, the curing degree of the pre-cured coating is 40-60%, the linear pressure of the embossing roller is 50-120 N / cm, and liquid nitrogen is sprayed to cool to 5-10° C. immediately after embossing to fix the coating.

8. The method for preparing a decorative film with an embossed pattern and scratched color according to claim 6, characterized in that: In step S5, the hydrophobic treatment agent is a perfluoroalkylsiloxane solution, and the spraying thickness is 0.5-2.0 μm.

9. The method for preparing a decorative film with an embossed pattern and a scratched color according to any one of claims 6 to 8, characterized in that: In step S3, the air guide groove 7 is molded by a pressing plate with a protrusion structure, the ratio of the protrusion height to the air guide groove depth is 1:1.2-1.5, and the molding pressure is 3-6 MPa.

10. The method for preparing a decorative film with an embossed pattern and a scratched color according to any one of claims 6 to 8, characterized in that: In step S4, the angled scraper blade edge is provided with a 0.1-0.3 mm wavy microstructure, which generates periodic pressure fluctuations when scraping ink, with a fluctuation amplitude of ±15%-25%.

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