CN114555359A

CN114555359A - Decorative film for metal plate and metal decorative plate comprising same

Info

Publication number: CN114555359A
Application number: CN202080071426.XA
Authority: CN
Inventors: 梁世螺; 徐知延; 柳茂善; 任巨赫; 李珉镐; 林京姬
Original assignee: Leerxinghuaos Co ltd
Current assignee: Leerxinghuaos Co ltd
Priority date: 2019-10-11
Filing date: 2020-10-08
Publication date: 2022-05-27
Also published as: KR20210043349A; WO2021071300A1; KR102655183B1

Abstract

The present invention relates to a decorative film for a metal plate and a metal decorative plate using the same, the decorative film for a metal plate comprising: a carrier film; an adhesive layer; a light-curable transparent resin layer disposed between the carrier film and the adhesive layer; a decorative layer disposed between the adhesive layer and the transparent resin layer; and a release type photocurable resin pattern layer disposed between the carrier film and the transparent resin layer.

Description

Decorative film for metal plate and metal decorative plate comprising same

Technical Field

The invention relates to a decorative film for a metal plate and a metal decorative plate comprising the same.

Background

Most of home appliances have various designs on their surfaces, and in particular, plastic products have a design of natural materials such as metal by attaching a decorative sheet to the surface in order to increase the added value thereof. As a conventional method for decorating these Metal plate materials for home electric appliances, there is a Pre-Coated Metal (PCM) method in which a Metal plate material is Coated or painted with a paint or the like before being formed and then formed. However, the PCM type sheet metal decorating method has a characteristic that the appearance of the sheet metal is not sufficiently varied and monotonous.

Although this PCM method is inexpensive, there is a problem that the design cannot be satisfactorily presented, and therefore, to improve this, a vcm (vinyl Coated metal) method has been developed. The VCM method is performed by laminating a polyvinyl chloride (PVC) film on one surface of a decorative film formed as a decorative layer on a polyester film (e.g., PET film) substrate, and then adhering the PVC film to an iron plate. However, since this VCM is made of PET alone, there is a problem that PET is cracked or hollows or falls off due to reliability problems when post-processing is performed.

In addition, in the VCM method, PET is subjected to hollowing or discoloration or a process yield is lowered in a high-temperature or high-humidity environment, and thus moldability is lowered in a process of bending or folding after heat-bonding to an iron plate, and a problem of hollowing or peeling of a decorative film occurs in a post-process such as pressing or folding.

In addition, in a post-processing method in which a metal plate is processed after transferring a decorative film to the metal plate or the like, there is a problem that post-processability such as film tearing or deformation is significantly reduced due to a reduction in elongation of the decorative film.

(patent document 1) Korean patent laid-open No. 2006-78530, "decorative film exhibiting metallic effect"

Disclosure of Invention

Technical problem

As a result of research to solve the above problems, the present inventors have developed an decorative film for a metal plate, which is different from a conventionally used decorative film for a metal plate, and which, when a decorative film for a metal plate, in which a transparent resin layer for protecting a surface is formed on a substrate film, and then a printing layer exhibiting metallic texture or the like and an adhesive layer or a primer layer are sequentially formed on the transparent resin layer, is manufactured and then the metal plate is transferred onto the metal plate, the decorative film for a metal plate to which the decorative film is transferred has a high elongation, and thus, even when the decorative film is attached to the metal plate and then processed, excellent moldability and post-processability can be exhibited.

Accordingly, an object of the present invention is to provide a decorative film for a metal plate and a decorative method of a metal plate, which are improved in the problems of the prior art in which moldability is lowered and hollowing of the decorative film occurs at the time of post-processing such as pressing or bending, and therefore, are more excellent in moldability and post-processing properties than ever before.

In addition, the present invention provides a metal decorative plate manufactured by the method for decorating a metal plate.

Technical problems of the present invention are not limited to the above-mentioned, and a plurality of technical problems not mentioned can be clearly understood from the following by those skilled in the art.

Technical scheme

To this end, the present invention provides a decorative film for a metal plate, comprising: a carrier film; an adhesive layer; a light-curable transparent resin layer disposed between the carrier film and the adhesive layer; a decorative layer disposed between the adhesive layer and the transparent resin layer; and a release type photocurable resin pattern layer disposed between the carrier film and the transparent resin layer.

In addition, the present invention provides a metal decorative plate, comprising: a metal layer; a light-curable transparent resin layer; a primer layer disposed between the metal layer and the transparent resin layer; an adhesive layer disposed between the primer layer and the transparent resin layer; and a decorative layer disposed between the adhesive layer and the transparent resin layer.

Advantageous effects

The decorative film for metal plates of the present invention has higher elongation and superior workability than those of conventionally used decorative films for metal plates, and therefore, even if the decorative film is processed after being attached to a processed metal plate, it can exhibit superior formability and workability, and can improve the problem of occurrence of hollowing of the decorative film for metal plates when post-processing such as pressing or bending is performed, and has an effect of not generating cloudiness or cracks (cracks) on the surface.

Advantageous effects are not limited to the above, and further effects are described in the specification.

Drawings

Fig. 1 is a schematic cross-sectional view of a decorative film for a metal plate.

Fig. 2 is a schematic view of a decoration method of a metal plate.

Fig. 3 is a schematic sectional view of a metal decorative plate.

Detailed Description

The advantages and features of the present invention and methods of accomplishing the same will become apparent with reference to the accompanying drawings and the following description of various embodiments and various experimental examples. The drawings are only for assisting understanding of the technical idea disclosed in the present specification, and the technical idea thereof is not limited to the drawings.

In addition, the present invention is not limited to the following disclosure, which makes it possible to embody various aspects, and the following disclosure makes the present invention more fully disclosed so as to introduce the scope of the present invention to those skilled in the art more fully, and the present invention is defined only by the claims.

When it is judged that the technical points may be confused about the detailed description of the related known art, the detailed description thereof is omitted.

Like reference numerals refer to like elements throughout the specification. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity of illustration.

Although the first, second, etc. are used to describe various constituent elements, these constituent elements are not limited to these terms. These terms are only used to distinguish one component from another component, and unless otherwise stated, the first component may be the second component.

Throughout the specification, unless specifically stated to the contrary, each constituent element may be singular or plural.

Throughout the specification, when a certain part "includes" or "has" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be further included.

Throughout the specification, when a expression "a and/or B" is made, A, B or a and B are indicated unless specifically stated to the contrary, and when a expression "C to D" is made, C or more and D or less are indicated unless specifically stated to the contrary.

When an element (elements) or layer is referred to as being "on" or "over" another element or layer, it can be directly on the other element or layer, or intervening layers or other elements may also be present. When the expression that the element is "directly on" or "directly above" is given, it means that there is no other element or layer in the middle.

As spatially relative terms, "lower", "bottom", "lower", "upper", and the like, as shown, may be used to facilitate describing a relationship between one element or constituent and another element or constituent. Spatially relative terms should be understood to include terms of different orientations of the elements in use or operation in addition to the orientation depicted in the figures.

The present invention will be described in more detail below with reference to the accompanying drawings.

Fig. 1 is a schematic cross-sectional view of an ornamental film 100 for a metal plate. The decoration film 100 for a metal plate of the present invention includes a carrier film 10, a release type photocurable resin pattern layer 21, a photocurable transparent resin layer 20, a decoration layer 30, and an adhesion layer 40. The decorative film 100 for a metal plate has a structure in which a release type photocurable resin pattern layer 21 and a photocurable transparent resin layer 20 are sequentially disposed on a carrier film 10, a decorative layer 30 is disposed on the photocurable transparent resin layer 20, and an adhesive layer 40 is disposed on the decorative layer 30.

In the present invention, the carrier film 10 may be a polyester resin film, a polyolefin resin film, a polyamide resin film, a polyacrylate resin film, a thermoplastic polyurethane resin film, a polycarbonate resin film, an Acrylonitrile-Butadiene-Styrene (ABS) resin film, or the like. Examples of the polyester resin film include a polyethylene terephthalate (PET) resin film, examples of the polyamide resin film include a nylon resin film, and examples of the polyolefin resin film include a polyethylene resin film and a polypropylene resin film.

In the present invention, the thickness of the carrier film 10 may be, for example, about 10 μm or more and less than about 100 μm. When the thickness of the carrier film 10 is less than about 10 μm, it is disadvantageous in terms of processability and handleability of the decorative film for metal plates, and when the thickness of the carrier film 10 is about 100 μm or more, the price competitiveness of the decorative film 100 for metal plates may be reduced. Thus, the thickness of the carrier film 10 may be, for example, about 20 μm to about 80 μm.

In the present invention, the carrier film 10 may be a film that is pre-patterned on the surface thereof, and specifically, a release type photocurable resin pattern layer 21 may be formed on the carrier film 10. At this time, the photo-curable transparent resin layer 20 may be formed on the pattern of the release photo-curable resin pattern layer 21. When the carrier film 10 and the release photocurable resin pattern layer 21 are removed after the decorative film 100 for a metal plate is adhered to the metal plate, the pattern layer (see fig. 3) where the release photocurable resin pattern layer 21 is removed remains on the surface of the photocurable transparent resin layer 20, and thus, a surface texture can be added to the metal decorative plate.

In the present invention, the release photocurable resin pattern layer 21 may include a photocurable resin, preferably including urethane acrylate containing silicone. In the present invention, as described above, the release type photocurable resin pattern layer 21 is formed between the carrier film 10 and the photocurable transparent resin layer 20, and thus, various designs such as a concave-convex feeling can be expressed, and the advantage of improving the transparency of the photocurable transparent resin layer is provided.

In the present invention, the light-curable transparent resin layer 20 may include an acrylate monomer, an acrylate oligomer, and a photoinitiator.

The acrylate monomer may be one or more selected from monofunctional acrylate monomers and multifunctional acrylate monomers.

In this case, the monofunctional monomer may be contained in an amount of 20 to 40 wt% based on the total weight of the transparent resin layer. When the content of the monofunctional monomer satisfies this range, there is an advantage in that the substrate adhesion is excellent.

As the monofunctional acrylate monomer, a monofunctional acrylate monomer having excellent adhesion and a monofunctional acrylate monomer having excellent elongation may be used in combination.

Isobornyl acrylate may be used as the monofunctional acrylate monomer having excellent adhesion. In addition, a relatively high monofunctional monomer having a molecular weight of 250 to 400 or a monofunctional monomer having a Cyclic (Cyclic) structure may be used as the monofunctional Acrylate monomer having excellent elongation, and specifically, one or more selected from the group consisting of Cyclic Trimethylolpropane Acrylate (Cyclic trimethyolpropane Acrylate), Caprolactone Acrylate (Caprolactone Acrylate), phenoxybenzyl Acrylate (Phenoxy benzyl Acrylate), Lauryl Acrylate (laurylacrylate), and Tetrahydrofurfuryl Acrylate (Tetrahydrofurfuryl Acrylate) may be used.

In order to improve both adhesion and elongation, it is necessary to include isobornyl acrylate, which is a monofunctional acrylate monomer excellent in adhesion, and to use one or more of the monofunctional acrylate monomers excellent in elongation in combination.

The isobornyl acrylate (IBOA) may be contained in an amount of 16 to 24 wt% with respect to the total weight of the transparent resin layer. When the content of the monofunctional monomer satisfies this range, there is an advantage in that adhesion is improved.

The monofunctional acrylate monomer having excellent elongation may be contained in an amount of 10 to 15 wt% based on the total weight of the transparent resin layer. When the content of the monofunctional monomer satisfies this range, there is an advantage in that elongation is improved.

The multifunctional monomer may include two or more functional groups, preferably three or more and nine functional groups, and specifically, one or more selected from Trimethylolpropane Triacrylate (TMPTA), 1, 6-hexanediol diacrylate, tripropylene glycol diacrylate, ditrimethylolpropane acrylate, polydipentaerythritol Hexaacrylate, and ethoxylated Hexaacrylate may be used. The multifunctional monomer may be contained in an amount of 5 to 15 wt% with respect to the total weight of the transparent resin layer. When the content of the polyfunctional monomer satisfies this range, there is an advantage in that high surface hardness and solvent resistance can be ensured.

The acrylate oligomer may use one or more selected from epoxy acrylate oligomers and difunctional urethane acrylate oligomers.

The epoxy acrylate oligomer may have a molecular weight of 200 to 10,000, and may be contained in an amount of 5 to 10 wt% with respect to the total weight of the transparent resin layer. When the content of the epoxy acrylate oligomer satisfies this range, there are advantages of high hardness and high flexibility, and excellent curability.

At this time, the difunctional urethane acrylate oligomer may use a difunctional urethane acrylate oligomer having a molecular weight of 2,000 to 100,000, and may include two or more difunctional urethane acrylate oligomers having different molecular weights (weight average molecular weights) from each other, and preferably, a difunctional urethane acrylate oligomer having a low molecular weight of 2,000 to 10,000 and a difunctional urethane acrylate oligomer having a high molecular weight of 30,000 to 100,000 are used together.

The low molecular weight difunctional urethane acrylate oligomer may be contained in an amount of 30 to 40% by weight, relative to the total weight of the transparent resin layer. When the content of the low molecular weight difunctional urethane acrylate oligomer satisfies the range, there are advantages of urethane acrylate, easy handling due to relatively low viscosity, and easy printing decoration as a subsequent process due to good Pigment wetting (Pigment wetting) property.

The content of the high molecular weight difunctional urethane acrylate oligomer may be 10 to 15% by weight with respect to the total weight of the transparent resin layer. When the content of the high molecular weight difunctional urethane acrylate oligomer satisfies this range, there is an advantage in that solvent resistance and surface hardness are increased.

The photoinitiator may have an absorption spectrum at a wavelength of 200 to 400nm, and specific examples thereof include Irgacure 651, Irgacure 184, Irgacure 1173, Irgacure 2959, Irgacure127, Irgacure 907, Irgacure 369, Irgacure 819, Irgacure TPO (all of BASF products), Omnirad 651, Omnirad 184, Omnirad 1173, Omnirad 2959, Omnirad127, Omnirad 907, Omnirad 369, Omnirad 819, and Omnirad TPO (all of IGM Resins products). The photoinitiator may be contained in an amount of 5 to 10 wt% based on the total weight of the transparent resin layer.

The photocurable transparent resin layer of the present invention can be cured by irradiating energy such as ultraviolet rays to the acrylate monomer, the acrylate oligomer, and the photoinitiator, for example, with an irradiation light amount of 100 to 1000mJ/cm²Ultraviolet rays of (1). The photocurable transparent resin layer may still have about 1 to 5 wt% of unreacted acrylate groups remaining after photocuring, and the photoinitiator may also have a trace amount of unreacted photoinitiator remaining.

Fig. 2 is a schematic view of a decoration method of a metal plate, and fig. 3 is a schematic cross-sectional view of a metal decoration plate manufactured by the decoration method of the metal plate of fig. 2. Referring to fig. 2 and 3, in the manufacturing process of the metal decorative sheet 200, the carrier film 10 and the release photo-curable resin pattern layer 21 are removed from the decorative film for metal sheet 100, and the transparent resin layer 20 constitutes one of the outermost layers of the metal decorative sheet 200.

Therefore, the transparent resin layer 20 is required to have chemical resistance, and although the higher the curing density of the transparent resin layer 20, the more the chemical resistance increases, the higher the curing density of the transparent resin layer 20, the higher the possibility of generating cracks on the surface of the transparent resin layer 20 when a normal temperature molding process such as bending (bonding) of the metal decorative sheet 200 is performed.

Therefore, in order to secure chemical resistance based on high curing density and minimize the possibility of generating cracks when performing normal temperature processing by improving toughness (toughens), the present invention utilizes a polymer formed by photocuring an acrylate monomer, an acrylate oligomer, and a photoinitiator, to obtain the transparent resin layer 20.

Referring again to fig. 1, the decoration layer 30 is described, and the decoration layer 30 may be a printing layer and/or a metallic layer. The printed layer may be provided with colour and/or texture. The printed layer can function to impart aesthetic sense to the decorative film 100 for a metal plate by color and/or texture.

The printing layer of the present invention may be a colored layer or a transparent layer. There is no particular limitation on the combination of inks used for forming the colored layer, the printing method, and the like. For example, the colored layer can be formed using one or a mixture of two or more types of printing inks or paints of acrylic type, vinyl chloride-vinyl acetate copolymers, polyurethane type, polyester type, cellulose derivatives type, chlorinated polypropylene type, polyvinyl butyral type, and the like. The texture may be formed on the print layer by a variety of means such as transfer printing, gravure printing, screen printing, offset printing, rotary printing or flexographic printing.

The metallic texture layer of the present invention can play a role of imparting a metallic texture to the decorative film 100 for a metal plate. The metal texture layer can be obtained by depositing a metal material on the transparent resin layer 20 by a method such as Sputtering (Sputtering) or thermal deposition. As a metal material for forming the metal texture layer, tin, indium, aluminum, copper, silver, platinum, chromium, nickel, or an alloy thereof, or the like can be used.

When the decoration layer 30 includes both a printing layer and a metal texture layer, the printing layer may be formed on the metal texture layer. In other words, when the decoration layer 30 includes both the printing layer and the metallic layer, the decoration film 100 for a metal plate may have a structure in which there is a metallic layer between the transparent resin layer 20 and the printing layer.

The thickness of the decorative layer 30 of the present invention may be from about 5nm to about 10 μm. The decoration layer 30 may be formed of a metal texture layer, and may include a laminated structure of a metal texture layer and a printing layer. In this case, the thickness of the metallic texture layer may be about 5nm to about 100 nm.

The decoration layer 30 of the present invention may be formed of a printed layer, and may have a laminated structure of a printed layer and a metal-like layer. At this time, the thickness of the printed layer may be about 0.1 μm to about 10 μm. By maintaining the thickness of the printed layer within this range, the decorative film 100 for a metal plate can achieve a precise printing effect and can ensure drying properties, thereby improving workability and productivity.

Referring to fig. 1 to 3, the adhesive layer 40 functions to adhere the decorative film 100 for a metal plate to the metal plate 80, and particularly, functions to adhere the decorative film 100 for a metal plate to the primer layer 82 of the metal plate 80. The material forming the adhesive layer 40 may be any material that can ensure sufficient adhesion between the decorative film 100 for a metal plate and the primer layer 82 of the metal plate 80, and may include, for example, a polyester-based resin and a curing agent.

Fig. 2 is a schematic view of a decoration method of a metal plate, schematically illustrating a process of transferring the decoration film for a metal plate in fig. 1 onto a metal plate, and fig. 3 is a schematic view of a metal decoration plate obtained by the decoration method of a metal plate in fig. 2.

The decoration method of the metal plate in fig. 2 includes a heating step, an adhesion step, and a removal step, by which the decoration film for metal plate of the present invention can be transferred onto the metal plate. The heating step is shown in fig. 2 (a), and is a step of preparing a metal plate 80 and heating at a predetermined temperature. That is, the heating step is a step of heating the metal plate coated with the primer layer on the metal layer. The metal plate 80 may include a metal layer 81 and a primer layer 82 disposed on the metal layer 81, and the primer layer 82 may be coated on one surface of the metal layer 81. The heating of the metal plate 80 may be performed, for example, at about 200 ℃ to about 350 ℃ for about 5 seconds to about 30 seconds.

The bonding step is a step of bonding the decorative film for metal plate 100 with the primer layer 82 of the metal plate 80 after the heating step, which is shown in (B) of fig. 2. As shown in fig. 2 (B), the adhesion step may be performed such that the adhesion layer 40 and the primer layer 82 are adhered to each other after the decorative film 100 for the metal plate is disposed on the primer layer 82 in such a manner that the adhesion layer 40, the decorative layer 30, the transparent resin layer 20, the release photocurable resin pattern layer 21, and the carrier film 10 are sequentially disposed from the primer layer 82 of the metal plate 80.

The removing step is a step of removing the carrier film 10 and the release photo-curable resin pattern layer 21 from the decoration film for metal plate 100 after the bonding step, and as a product of the removing step, the metal decoration plate 200 in fig. 3 is obtained.

Referring to fig. 3, the metal decorative panel is obtained by the metal panel decoration method, and the metal decorative panel 200 has a structure in which a primer layer 82, an adhesive layer 40, a decorative layer 30, and a transparent resin layer 20 are sequentially disposed on a metal layer 81. As described above, the transparent resin layer 20 is directly in contact with the external environment such as air, and the release photocurable resin pattern layer 21 and the carrier film 10 are not disposed on the transparent resin layer 20.

The metal layer 81 may include one or more selected from GI, EGI, SUS 304, SUS 430, and SUS 201. The metal layer may be different depending on which product is used, and may be different depending on the kind of metal. The thickness of the metal layer may be 1 to 10mm, for example, when a GI steel sheet is used, the thickness may be 5 to 8 mm.

The primer layer 82 may comprise a polyester series primer. The primer contained in the primer layer may be any primer as long as it is a polyester series used in the art. The thickness of the primer layer can be 1-30 μm, and preferably 10-20 μm.

Except for this, the composition of the adhesion layer 40, the decoration layer 30, and the transparent resin layer 20 is the same as that described in the decoration film for metal plates described above.

The depth of the metal decorative sheet of the present invention based on ASTM E643-09 can be 7mm or more, preferably 8mm or more, and most preferably 9mm or more. The depth of the gauge is a depth (mm) of the positioning pin shaft pressed in until a crack (crack) is generated by applying a predetermined pressure in the thickness direction, and a higher value indicates more excellent flexibility (moldability).

In order to measure the depth of the force signal according to ASTM E643-09, for example, on an EGI steel plate or a Stainless steel (Stainless) plate having a thickness of 5mm, after transferring the decorative film for a metal plate to the metal plate, the PET film is removed, and then the value of the depth of the force signal (thickness direction) according to ASTM E643-09 measured may be 7mm or more, preferably 8mm or more, more preferably 9mm or more.

In addition, the transparent resin layer may have a start point of change in gloss based on MEK damage test according to ASTM D5402 of 75 times or more, preferably 85 times or more, more preferably 100 times or more.

The transparent resin layer may have a surface hardness of H or more, preferably 2H or more, in accordance with ASTM D3363.

In addition, the transparent resin layer may include a polymer formed by photocuring a monomer, an oligomer, and a photoinitiator, and the specific contents of the monomer, the oligomer, and the photoinitiator are the same as those described in the above-described decorative film for a metal plate.

Detailed description of the preferred embodiments

The following preferred embodiments are provided to aid in understanding the present invention, the embodiments described below are merely illustrative of the present invention, and it is apparent to those skilled in the art that various changes and modifications can be made within the scope and technical spirit of the present invention, and the changes and modifications fall within the scope of the appended claims.

Example (b): example 1 and comparative examples 1 to 3

Preparation example

According to the combinations shown in table 1, monomers, oligomers, and photoinitiators were mixed in the combinations shown in table 1 (on a weight% basis) to prepare transparent resin liquids of preparation examples 1 to 4.

Table 1:

1)Omnirad 1173

2) IBOA/Rodiya Co Ltd

3) Miramer M1110/Meiyuan special chemical industry

4) Miramer M300/Meiyuan special chemical industry

5) Miramer PU 2100/Meiyuan special chemical industry

6) Miramer PE 230/Meiyuan special chemical industry

7) Miramer UA 5216/American source special chemical industry

Preparation of a decorative film for metal sheets: example 1 and comparative examples 1 to 3

A photocurable resin coating liquid (MO500-UV, Chokwang Paint) consisting of urethane acrylate containing silicone was coated on a polyethylene terephthalate film having a thickness of 30 μm, and coated using a chrome-plated roller formed with a fine concave-convex pattern of 15 μm.

While the coating was performed, the light quantity of the light irradiated to the surface of the polyethylene terephthalate film, which was not coated with the photocurable resin, was 400mJ/cm²To cure the photocurable resin coating liquid, thereby forming a photocurable resin pattern layer. Thereafter, the film was separated from the roll.

Thereafter, the transparent resin solutions of preparation examples 1 to 4 were roll-coated on the patterned polyethylene terephthalate film layer at a thickness of 10 μm while irradiating a light amount of 400mJ/cm to a surface on which a photocurable resin pattern was not formed²And (3) curing the photocurable resin coating liquid to form a photocurable transparent resin layer. At this time, the compound prepared by the preparation example 1 was used as example 1, and the compound prepared by the preparation examples 2 to 4 were used as comparative examples 1 to 3. Then, a print layer prepared using 68 parts by weight of a urethane Ink vehicle (SAMYOUNG Ink, NT-medium), 16 parts by weight of MEK, and 16 parts by weight of a color Ink (SAMYOUNG Ink, NT-color) was formed on the transparent resin layer in a thickness of 1 μ M by using a gravure printing machine, and an adhesive layer of a polyester-series adhesive primer (30 parts by weight of SKC SKYBON _ ES _460M, 35 parts by weight of MEK, 28 parts by weight of toluene, and 7 parts by weight of a polyisocyanate curing agent (DOW, Voranate T-80)) using a polyisocyanate as a curing agent was formed in a thickness of 1 μ M by using a gravure printing machine, thereby preparing a decorative film for a metal plate.

Examples of the experiments

< chemical resistance test of transparent resin layer >

After the decorative films for metal plates of example 1 and comparative examples 1 to 3 were transferred to a metal plate (BN steel company) prepared by coating a polyester adhesion primer (dongkok-KCC iron plate paint, koste primer) on a SUS 430 steel plate having a thickness of 5mm at a thickness of 20 μm, the PET film and the release photocurable resin pattern layer were removed, and thus a sample was prepared.

The samples were dried in an oven at 150 ℃ for 1 minute and then aged in an oven at 50 ℃ for 3 days. An MEK damage test was performed according to ASTM D5402, and after five pieces of cotton wool were stacked and immersed in methyl ethyl ketone for 30 seconds, a plurality of cotton wool soaked with methyl ethyl ketone were reciprocated on the surface of the transparent resin layer by a weight with a load of 3 kg.

The starting point of the occurrence of the gloss change was set as the starting point of the occurrence of the noticeable scratch before and after the chemical resistance test, and is shown in table 2.

Table 2:

categories	Starting point of gloss change
		Example 1	100
Comparative example 1	70
		Comparative example 2	55
Comparative example 3	35

< elongation test of decorative film for Metal plate >

After the decorative films for metal plates of example 1 and comparative examples 1 to 3 were transferred to a metal plate (BN steel company) prepared by coating a polyester adhesion primer (dongkok-KCC iron plate paint, costt primer) on a SUS 430 steel plate having a thickness of 5mm at a thickness of 20 μm, the PET film and the release photo-curable resin pattern layer were removed, and thus a sample was prepared.

According to ASTM E643-09, the depth (mm) of the indentation when a predetermined pressure is applied to the positioning pin in the thickness direction of the specimen until cracking (crack) occurs was confirmed using an apparatus of Erichsen (Erichsen).

Table 3:

table 3 shows the gauge depth of the punch (mm), and it can be confirmed that the gauge depth of example 1 is 9mm or more, and the formability is excellent because the flexibility is excellent. On the other hand, comparative examples 1 to 3 had an instrumental force signal depth of 6 to 7mm, and had poor moldability due to low flexibility, and had whitened surfaces.

< surface hardness test >

The hardness was measured by scratching the surface of the coated test piece with a load of 1kg using a pencil (Mitsubishi Nos. 2B to 2H) according to ASTM D3363, and is shown on the degree of scratching. Hardness values are expressed in terms of pencil lead hardness and concentration.

Table 4:

categories	Surface hardness
		Example 1	2H
Comparative example 1	H
		Comparative example 2	HB
Comparative example 3	F

< T-bending test >

A 50 × 150mm Test piece of the sample was held and fixed by a Mandrel Test Jig (Mandrel Test Jig) having a predetermined diameter so that the coated surface thereof faces outward. And then bending the test piece by 180 degrees, and at the moment, putting the test piece with the same thickness as the test piece into the bent inner gap. According to the number of test pieces, the numbers are marked as 1T, 2T, etc. The results of visually confirming the bent surface after bending are shown in table 5.

Table 5:

as shown in table 5, it was confirmed that in example 1, even when the number of test pieces was two (2T), the bent surface was smooth without cracks (crack) or wrinkles, and in comparative examples 1 to 3, only when the number of test pieces was three (3T), the bent surface was smooth without cracks (crack) or wrinkles.

Although the present invention has been described above with reference to the drawings, the present invention is not limited to the above-described embodiments, and various embodiments different from each other can be combined and made by combining the contents disclosed in the respective embodiments, and it is apparent to those skilled in the art that the present invention can be implemented in other specific forms without changing the technical idea and the essential features of the present invention. The various embodiments described above are therefore to be understood as illustrative in all respects and not restrictive.

Reference numerals

100: decorative film for metal plate

10: carrier film

20: transparent resin layer

21: release photo-curable resin pattern layer

30: decorative layer

40: adhesive layer

200: metal decorative plate

80: a metal plate.

Claims

1. A decorative film for a metal plate, the decorative film comprising:

a carrier film;

an adhesive layer;

a light-curing type transparent resin layer disposed between the carrier film and the adhesive layer;

a decorative layer disposed between the adhesive layer and the transparent resin layer; and

and the light-curing resin pattern release layer is positioned between the bearing film and the transparent resin layer.

2. The decoration film for metal plate of claim 1, wherein the depth of the instrumental force signal in the thickness direction according to ASTM E643-09 is 7mm or more when the decoration film for metal plate obtained by coating a polyester adhesion primer having a thickness of 20 μm on a SUS 430 steel plate having a thickness of 5mm is transferred to the metal plate.

3. The decoration film for metal plate according to claim 1 wherein, the light-curable transparent resin layer has a gloss change time point of 100 times or more as measured by MEK damage test according to ASTM D5402.

4. The decorative film for a metal plate according to claim 1, wherein the surface hardness of the light-curable transparent resin layer according to ASTM D3363 is 2H or more.

5. The decoration film for metal plate of claim 1 wherein, the light-curable transparent resin layer includes a polymer formed by curing an acrylate monomer, an acrylate oligomer and a photoinitiator.

6. The decoration film for metal plate according to claim 5, wherein the acrylate monomer is at least one selected from the group consisting of acrylate monofunctional monomers and acrylate multifunctional monomers.

7. The decoration film for metal plate according to claim 6, wherein the acrylate type monofunctional monomer is at least one selected from the group consisting of isobornyl acrylate (IBOA), cyclotrimethylolpropane acrylate, caprolactone acrylate, phenoxybenzyl acrylate, lauryl acrylate and tetrahydrofurfuryl acrylate.

8. The decoration film for metal plate of claim 6, wherein the acrylate-based multifunctional monomer is at least one selected from the group consisting of trimethylolpropane triacrylate (TMPTA), 1, 6-hexanediol diacrylate, tripropylene glycol diacrylate, ditrimethylolpropane acrylate, polydipentaerythritol hexaacrylate, and ethoxylated hexaacrylate.

9. The decoration film for metal plate according to claim 5, wherein the acrylate-based oligomer is at least one selected from the group consisting of an epoxy acrylate oligomer and a difunctional urethane acrylate oligomer.

10. The decoration film for metal plate according to claim 5 wherein, the photoinitiator has an absorption spectrum at 200 to 400 nm.

11. The decoration film for metal plate of claim 1 wherein, the photo-curable resin pattern release layer comprises urethane acrylate containing silicone.

12. The decoration film for metal plate according to claim 1 wherein, the decoration film for metal plate is transferred to the metal plate.

13. A metal decorative plate comprises a metal plate and a metal plate,

a metal layer;

a light-curable transparent resin layer;

a primer layer disposed between the metal layer and the transparent resin layer;

an adhesive layer disposed between the primer layer and the transparent resin layer; and

a decorative layer disposed between the adhesive layer and the transparent resin layer.

14. The metal decorative plate of claim 13, wherein the metal layer is at least one selected from the group consisting of GI, EGI, SUS 304, SUS 430, and SUS 201.

15. The metal decorative panel according to claim 13, wherein the thickness of the metal layer is 1mm to 10 mm.

16. The metal decorative panel according to claim 13, wherein the primer layer has a thickness of 1 to 30 μm.

17. The metallic trim panel of claim 13 wherein the primer layer comprises a polyester-based primer.