JP2016168787A - Decorative sheet and decorative material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative sheet that has heat shielding properties and can prevent warpage due to infrared light.SOLUTION: A decorative sheet 10 is produced by providing a top coat layer 19 on one surface of a coloring base material layer 11. A polyolefin resin is used as the coloring base material layer 11, an acrylic urethane resin containing a triazine ultraviolet absorber is used as the top coat layer 19, and a thickness of the top coat layer 19 is set at 5 g/mor more and 10 g/m or less with the amount of coating of the solid content. A printing layer 13 is provided between the coloring base material layer 11 and the top coat layer 19, and the printing layer 13 contains an azomethine azo pigment as a black pigment.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a decorative sheet used as a building material and a decorative material using the decorative sheet. In addition, the decorative sheet and the decorative material of the present invention are suitable for exterior use used outdoors.

  A decorative sheet is used for various uses such as indoor and outdoor buildings and furniture and furniture as a building material that is inexpensive and excellent in processability. Among such decorative sheets, an exterior decorative sheet used outdoors is used by being attached to the surface of an exterior decorative steel sheet such as an entrance. The exterior decorative sheet is required to have weather resistance higher than that of the interior decorative sheet.

  As decorative sheets having high weather resistance, decorative sheets using olefin-based materials are currently in practical use. The weather resistance is evaluated by actual outdoor exposure and accelerated weather resistance test. The weather resistance of a decorative sheet using an olefin-based material satisfies a practical condition. Such a decorative sheet is described in Patent Documents 1 to 3, for example.

JP 2013-86451 A JP 2013-23748 A JP 2014-172197 A

  However, the existing exterior decorative sheet was evaluated for weather resistance against ultraviolet light of sunlight, and although it was formulated, weather resistance against infrared light was not considered. In the exterior decorative sheet, heat is stored by absorbing infrared light, and expansion is caused by the stored heat being transmitted to the base material of the decorative sheet. When the base material of the decorative sheet expands, the decorative material to which the decorative sheet is bonded is warped, and the beauty of the building material and the function of protecting the building are deteriorated.

  This invention is made | formed in view of such a point, and it aims at providing the decorative sheet and cosmetics which have heat insulation and can prevent the curvature by infrared light.

In order to solve the above problems, a decorative sheet of one embodiment of the present invention is provided with a coating layer on one surface of a colored base layer, the colored base layer is made of a polyolefin-based resin, and the coating layer is a triazine-based ultraviolet ray. It consists of an acrylic urethane-based resin containing an absorbent, and the thickness of the coating layer is 5 g / m ² or more and 10 g / m ² or less in terms of solid content, and between the colored substrate layer and the coating layer It has a printing layer, and the printing layer contains an azomethine azo pigment as a black pigment.

  In order to solve the above problems, the decorative material of one embodiment of the present invention is formed by bonding the decorative sheet containing an azomethine azo pigment as a black pigment in the printed layer to a base material.

  According to one embodiment of the present invention, a azomethine azo pigment is included as a black pigment in a colored base material layer. Therefore, a decorative sheet and a cosmetic material that have heat shielding properties and can prevent warpage due to infrared light are provided. be able to.

It is sectional drawing which shows the structure in one Embodiment of a decorative material.

Hereinafter, a decorative sheet and a decorative material according to an embodiment of the present invention will be described.
(Cosmetic materials)
FIG. 1 is a cross-sectional view for explaining a decorative material 1 of the present embodiment. The decorative material 1 includes a base material 20, a decorative sheet 10 that is bonded to the base material 20, and a first adhesive layer 21 that bonds the base material 20 and the decorative sheet 10.
The decorative material 1 of the present embodiment increases the transmittance of the printing layer 13 with respect to infrared light having a wavelength of 0.7 μm to 1000 μm, and reflects the transmitted infrared light by the colored base material layer 11, whereby the base material 20. Prevents heat storage.

(Decorative sheet)
The decorative sheet 10 is provided with a top coat layer 19 as a coating layer of the present embodiment on one side of the colored substrate layer 11. That is, the decorative sheet 10 is provided in order from the thermoplastic resin base material 11 side, the colored base material layer 11, the printing layer 13, the overlay film layer 15, the second adhesive layer 17, and the top as the coating layer of this embodiment. A coat layer 19 is provided. Here, in the description of the present embodiment, for each layer constituting the decorative material 1 and the decorative sheet 10, the side on which the printed layer 13 is formed on the basis of the colored base material layer 11 is defined as one surface (upper surface, upper surface). ) And the side on which the first adhesive layer 21 and the base material 20 described later are provided will be described as the other surface (lower surface, lower surface).

Hereinafter, each layer of the decorative sheet 10 will be described.
<Colored substrate layer>
As the colored base material layer 11, one made of a polyolefin resin is used. As the colored base material layer 11, a translucent material or a colored material can be selected depending on the application.

  By using a polyolefin-based resin for the colored base material layer 11, the decorative material 1 is different from the fluorine-based resin, and even if it is incinerated, there is no problem. As the polyolefin-based resin, polyethylene, polypropylene, or a modified resin thereof is generally used, but a polypropylene-based resin is preferable in consideration of surface hardness, heat resistance, and the like. There are two types of polypropylene-based resins, random copolymerization and homo-based resins, both of which can be used depending on the application.

  Moreover, you may add a ultraviolet absorber (benzotriazole type | system | group, a triazine type | system | group, a benzophenone series etc.) to the colored base material layer 11 as a weather-resistant prescription. The addition amount may be added according to the desired weather resistance, but is 0.1% to 10%, preferably 1% to 5% with respect to the resin solid content. Among the ultraviolet absorbers, 2- (2-hydroxy-5-tert-butylphenyl) -2H-benzotriazole, 2- (5-methyl-2-hydroxyphenyl) benzotriazole, 2- [ 2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2- (3,5-di-t-butyl-2-hydroxyphenyl) benzotriazole, 2- (3 -T-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3,5-di-t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3 , 5-Di-t-amyl-2-hydroxyphenyl) benzotriazole, 2- (2′-hydroxy-5′-t-octylphenyl) ben Examples thereof include zotriazole and the like, mixtures thereof, modified products, polymers, and derivatives.

  Examples of triazines include 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol, 2- [4-[(2-hydroxy -3-dodecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2- [4-[(2-hydroxy-3) -Tridecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4dimethylphenyl) -1,3,5-triazine, 2,4-bis (2,4-dimethylphenyl)- 6- (2-Hydroxy-4-iso-octyloxyphenyl) -s-triazine and the like, a mixture, a modified product, a polymer, and a derivative thereof can be used. Furthermore, as the benzophenone series, octabenzone, modified products thereof, polymers and derivatives can be used.

  Further, a hindered amine light stabilizer may be added in order to prevent the resin itself from being deteriorated by light, heat, water or the like. The added part may be added according to the desired weather resistance, but is 0.1% to 10%, preferably 1% to 5% with respect to the resin solid content. As a hindered amine light stabilizer, bis (1,2,2,6,6-pentamethyl-4-piperidyl) [[3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl] methyl] Butyl malonate, bis (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, methyl (1,2,2,6,6-pentamethyl-4-popperidinyl) sebacate, bis (2) decanedioate , 2,6,6-tetramethyl-1 (octyloxy) -4-piperidinyl) ester, mixtures thereof, modified products, polymers, derivatives, and the like.

  The colored base material layer 11 can be obtained by appropriately blending the above materials and molding it into a film by an extrusion molding method, an inflation molding method, a calendar molding method, or the like. The thickness of the colored base material layer 11 is suitably about 30 μm to 120 μm in consideration of the ease of adhesive bonding processing, weather resistance, transparency, and the like.

In the present embodiment, the colored base material layer 11 may contain a pigment for increasing the reflectance of infrared light in the colored base material layer 11.
As the pigment to be contained in the colored substrate layer 11, at least one of isoindolinone, disazo, polyazo, diketopyrrolopyrrole, quinacridone, phthalocyanine, and titanium oxide is used.

That is, in this embodiment, heat shielding property improves by making the colored base material layer 11 contain, for example, 23 parts by mass or more of titanium oxide.
Moreover, when using a titanium oxide as a hiding layer for the colored base material layer 11, the sum total of content of the titanium oxide as a hiding layer and the added titanium oxide should just be 23 mass parts or more. Moreover, when the coloring base material layer 11 contains 23 mass parts or more of titanium oxide as a concealing layer, it is not necessary to add titanium oxide any more.
However, when the amount of titanium oxide added to the colored base material layer 11 increases, the titanium oxide affects the film quality of the colored base material layer 11. For this reason, suitable content of the titanium oxide of the colored base material layer 11 is 23 to 50 mass parts.

  In the present embodiment, as shown in FIG. 1, the titanium oxide layer 111 may be provided by applying titanium oxide to the surface of the colored base layer 11 on the printed layer 13 side. Even when the titanium oxide layer 111 is provided, if the colored base material layer 11 contains 23 parts by mass or more of titanium oxide by the titanium oxide layer 111, the heat shielding property to the base material 20 by the colored base material layer 11 is improved. To do. Under such conditions, the thickness of the titanium oxide layer 111 is preferably 5 μm to 10 μm. Instead of the titanium oxide layer 111, a layer made of the above pigment (isoindolinone, disazo, polyazo, diketopyrrolopyrrole, quinacridone, phthalocyanine) may be provided.

<Print layer>
The printed layer 13 is provided for the purpose of imparting a desired decorative design to the target decorative sheet. In the present invention, a printing layer 13 having an appropriate pattern is provided on the surface of the colored substrate layer 11 by means such as a printing method.

  The print layer 13 is provided using a colorant (ink) suitable for the colored base material layer 11. Specifically, if the colored substrate layer 11 is a polypropylene resin, a mixture of a urethane resin and vinyl chloride = vinyl acetate copolymer resin is preferably used.

  As the colorant, an azomethine azo pigment is particularly used as a black pigment. Thereby, the absorption of infrared rays into the printing layer 13 is reduced, the heat storage function is suppressed, and the infrared reflectance as a decorative sheet can be increased.

[Azomethine azo pigments]
The azomethine azo pigments have a diazonium group that is a reaction compound of tetrachlorophthalimide and aminoaniline, and those having a particle diameter of 0.1 to 0.3 μm are particularly suitable. By using these, characteristics such as absorption in the visible part and reflection in the infrared part are remarkably exhibited.
The inventors of the present invention printed a wood grain pattern using the above colorants, and measured the total infrared light transmittance of the printed layer 13. According to this measurement, the transmittance of light having a wavelength of 0.781 μm to 2.5 μm was 80% or more. More detailed data of the transmittance of each pigment will be shown later.

  In addition, for the printing layer 13, for example, extender pigments, plasticizers, dispersants, surfactants, tackifiers, adhesion assistants, drying agents, heat stabilizers, weathering stabilizers, curing agents, curing accelerators. Various additives such as an agent or a curing retarder can also be added as appropriate.

  The method for forming the printing layer 13 is not particularly limited, and various conventional printing methods such as a gravure printing method, an offset printing method, a screen printing method, a flexographic printing method, an electrostatic printing method, and an ink jet printing method are used. can do. In addition, for example, in the case of a solid surface, in addition to the above-described various printing methods, for example, roll coating method, knife coating method, air knife coating method, die coating method, lip coating method, comma coating method, kiss coating method, flow coating method Various coating methods such as a dip coating method can also be used. In addition, for example, a hand-drawn method, ink-sink method, photographic method, laser beam or electron beam drawing method, partial vapor deposition method or etching method of metal or the like, or a combination of these methods can of course be performed.

  Further, prior to the formation of the printing layer 13, as necessary, the surface of the colored substrate layer 11 may be subjected to a surface treatment such as corona treatment, ozone treatment, plasma treatment, ionizing radiation treatment, dichromate treatment, anchor or primer treatment. The adhesion between the colored base material layer 11 and the printing layer 13 can also be improved.

  There are no particular restrictions on the type of pattern that the printed layer 13 constitutes, and a wood grain pattern, stone pattern, cloth pattern, abstract pattern, geometric pattern, etc. that have been widely used in the field of decorative sheets, or simple coloring. In the case of aiming at color adjustment, it may be a solid color. In short, any desired picture can be adopted depending on the intended use of the decorative sheet.

<Overlay film layer>
For the overlay film layer 15, a resin as a material is selected in consideration of interlayer adhesion with the colored base material layer 11 and the print layer 13. Specifically, if the colored substrate layer 11 is any one of a homopolypropylene resin, a random polypropylene resin and a polyethylene resin, any one of the same homopolypropylene resin, random polypropylene resin and polyethylene resin is selected. Is done. In addition, it is preferable to add an ultraviolet absorber and a hindered amine light stabilizer to the overlay film layer 15.

  In addition, when the overlay film layer 15 becomes a surface layer without providing the top coat layer 19 as an upper layer, it is preferable to use a polymethylmethacrylic resin as the overlay film layer 15. At this time, it is preferable to add an ultraviolet absorber and a hindered phenolic antioxidant to the overlay film layer 15. Further, in consideration of interlayer adhesion with the printing layer 13, the printing layer 13 is attached to the printing layer 13 with an adhesive made of at least one of acrylic resin, polyester resin, vinyl chloride = vinyl acetate copolymer resin. Combined.

  The overlay film layer 15 needs to have transparency that allows at least the printed layer 13 on the other surface side to be seen through, and is most preferably colorless and transparent. Also good. As long as this is the case, the overlay film layer 15 may contain a colorant and a filler.

  The surface of the overlay film layer 15 (one surface or the other surface) can be appropriately provided with an emboss having a desired pattern as necessary. There is no particular limitation on the type of embossed pattern, and for example, it may be various patterns such as wood grain (particularly conduit pattern), stone texture, fabric texture, Japanese paper texture, geometric pattern, etc. It may be a simple matte shape, grain shape, hairline shape, suede tone or the like. Further, the design can be further improved by synchronizing these embossed patterns with the pattern of the printed layer 13, but if not necessary, the pattern of the printed layer 13 may be out of sync. Embossing of a pattern including both a pattern synchronized with and a pattern not synchronized can be provided.

  The embossing method is not particularly limited, but a mechanical embossing method using a metal embossing plate is the most common. Also, there is no particular limitation on the formation time of the embossing, and any time can be selected from before, simultaneously with, or after the lamination of the transparent acrylic resin film 5 with the colored substrate layer 11. Embossing of the same or different pattern can be performed multiple times at a plurality of times selected from each time.

The thickness of the overlay film layer 15 is preferably about 50 to 150 μm, more preferably about 70 to 100 μm.
As a method for forming the overlay film layer 15, for example, an extrusion molding method, an inflation molding method, a calendar molding method, a cast molding method, or the like can be used.

<Second adhesive layer>
The second adhesive layer 17 is provided for the purpose of allowing adhesion between the overlay film layer 15 and the top coat layer 19 by a dry laminating method and developing adhesive strength between both layers. Adhesive made of urethane resin with polyester resin as the main chain is adopted. As an adhesive made of a urethane resin, a polyester polyol type and a two-part urethane resin adhesive of hexamethylene diisocyanate, tolylene diisocyanate, and a mixture thereof as a curing agent and coated with a thickness of 2 μm to 10 μm after drying, etc. Can be used.

  For the second adhesive layer 17, depending on the intended use of the decorative sheet, for example, an antioxidant, an ultraviolet absorber, a light stabilizer, a heat stabilizer, a plasticizer, a lubricant, an antistatic agent, a flame retardant, One or more conventionally known various additives such as fillers may be added.

<Topcoat layer>
The top coat layer 19 is prepared by adding an ultraviolet absorber and a hindered amine light stabilizer to acrylic polyol as a main resin and hexamethylene diisocyanate as a curing agent. As the ultraviolet absorber, a triazine ultraviolet absorber is used.

  Examples of the triazine ultraviolet absorber include 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol, 2- [4-[(2- Hydroxy-3-dodecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2- [4-[(2-hydroxy- 3-tridecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4dimethylphenyl) -1,3,5-triazine, 2,4-bis (2,4-dimethylphenyl) -6- (2-hydroxy-4-iso-octyloxyphenyl) -s-triazine and the like, mixtures, modified products, polymers, and derivatives thereof can be used. Furthermore, as the benzophenone series, octabenzone, modified products thereof, polymers and derivatives can be used.

The thickness of the top coat layer 19 is 5 g / m ² or more and 10 g / m ² or less in terms of solid content. Still more preferably 6 g / ^{m 2} or more 9 g / ^{m 2} or less. Thereby, versatility, such as the coating property of the topcoat layer 19 of this embodiment and storage, becomes high.

  Further, in the present embodiment, the coating layer is the topcoat layer 19 that is the uppermost layer of the decorative sheet 10, but the present embodiment is not limited to the coating layer being the topcoat layer 19. For example, the coating layer below the top coat layer 19 may contain a triazine-based ultraviolet absorber, or another coating layer may be appropriately provided on the coating layer containing the triazine-based ultraviolet absorber.

<Base material>
The base material 20 is used by attaching (laminating) the decorative sheet 10 to the surface. The base material 20 includes various materials such as a metal base material and a wood base material. An example of the metal base material is an Alpolic material. The Alpolic material is an aluminum resin composite plate in which a resin material is sandwiched between metal plates that have been subjected to surface processing such as painting or mirror finishing. As the metal plate, aluminum, galvalume steel plate, stainless steel, titanium or the like is used. As the resin material, polyethylene alone or a material obtained by adding an inorganic material to polyethylene is used.

Moreover, as a wood-type base material, MDF (medium density fiberboard), a plywood, a particle board etc. are used, for example.
For attaching the sheet 3 to the base material 20, for example, an appropriate adhesive such as urethane or vinyl acetate is used.

<First adhesive layer>
As the 1st contact bonding layer 21, if it is a well-known adhesive used for bonding of the decorative sheet for floors and a base material, what kind of thing may be used. In the present embodiment, for example, the first adhesive layer 21 can be formed using a reactive hot-melt adhesive. In particular, the first adhesive layer 21 may be formed using a two-component polyurethane adhesive among reactive hot-melt adhesives. Among such first adhesive layers 21, in the present embodiment, it is particularly preferable to use a member that has been certified non-combustible according to the regulations of the Japan Wallcovering Association.
The first adhesive layer 21 may contain an ultraviolet absorber or a light stabilizer. The thickness of the first adhesive layer 21 is preferably about 5 μm to 50 μm.

  According to this embodiment described above, since the azomethine azo black pigment is used as the black pigment, the light transmittance in the printed layer is higher than that of the existing decorative sheet. Since the infrared light transmitted through the printing layer 13 is reflected by the colored base material layer, heat is not transmitted to the base material 20, and heat storage of the base material 20 can be prevented. And by preventing the heat storage of the base material 20, it is possible to obtain a cosmetic material 1 that is less likely to be warped by sunlight even when used outdoors.

In the present embodiment, an acrylic urethane-based resin is used as the topcoat layer 19, a triazine-based ultraviolet absorber having good compatibility with this is used, and the solid content coating amount is 5 g / m ² or more. It is possible to form a coating film that is excellent in ultraviolet shielding power and does not deteriorate even over time. Moreover, the coating film without a crack of a surface protective layer can be formed also at the time of the lamination to an uneven | corrugated | grooved part by making solid content application amount into 10 g / m < ² > or less.

The embodiment described above exemplifies a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention is based on the material, shape, structure, arrangement, etc. of the component parts. It is not specific to the above. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.
In addition, it should be noted that the drawings in the embodiments are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the above description.

Next, an embodiment of the present invention will be described with reference to FIG.
Example 1
In Example 1, 3 parts by weight of a hindered phenolic antioxidant, 1 part by weight of an ultraviolet absorber, 1 part by weight of a hindered amine light stabilizer, and 23 parts by weight of titanium oxide as a colored base material layer were added to 100 parts by weight of a polypropylene resin. This was added to form a film having a thickness of 70 μm.

<Formation of printing layer>
Next, as a printing layer 13 on one surface of the colored substrate layer 11, 100 parts by mass of a urethane resin and a vinyl chloride-vinyl acetate copolymer resin mixed in a ratio of 7: 3 are added to hexamethylene diisocyanate and isophorone diisocyanate. 3 parts by mass of a curing agent mixed in a ratio of 2: 8 was added, and an azomethine azo resin having an average particle size of 0.2 μm as an isoindolinone, polyazo, phthalocyanine and black pigment (manufactured by Dainichi Seikagaku Corporation) 3 parts by mass of Chromofine Black A-1103 ") was added to form an ink, and a conduit pattern was formed by gravure printing.

<Formation of overlay film layer>
Next, the overlay film layer 15 was formed on the printing layer 13. The overlay film layer 15 is formed into a film by melt extrusion with 100 parts by mass of a random polypropylene resin added with 0.5 parts by mass of a benzotriazole UV absorber and 0.3 parts by mass of a hindered amine light stabilizer. It was produced by doing. The thickness of the overlay film layer 15 after drying was 70 μm.

<Formation of topcoat layer>
Next, a top coat layer 19 was formed on one surface of the overlay film layer 15. The topcoat layer 19 was formed by coating 10 parts by weight of hexamethylene diisocyanate, 5 parts by weight of a triazine-based ultraviolet absorber and 5 parts by weight of a hindered amine light stabilizer with respect to 100 parts by weight of the acrylic polyol. The top coat layer 19 was 6 g / m ² in terms of solid content, and the thickness was 9 μm.

(Example 2)
Example 1 except that the pigment of the colored base layer 11 in the decorative sheet 10 of Example 1 was replaced with 2 parts by mass of diketopyrrolopyrrole, 2 parts by mass of quinacridone, 1 part by mass of phthalocyanine, and 23 parts by mass of titanium oxide. Thus, a decorative sheet 10 of Example 2 was produced.

(Comparative Example 1)
A decorative sheet 10 of Comparative Example 1 was produced in the same manner as in Example 1, except that the azomethine azo resin was replaced with carbon black as the black pigment of the printing layer 13 in the decorative sheet 10 of Example 1.

<Evaluation>
The decorative sheets obtained in Example 1, Example 2 and Comparative Example 1 were evaluated for heat shielding performance, heat storage performance and weather resistance, respectively.
[Heat insulation performance]
As an evaluation of the heat shielding performance, it was measured using a method for measuring the solar reflectance of a coating film defined in JIS standard, K5602. The measurement was performed using a spectrophotometer UV3600 (product name) manufactured by Shimadzu Corporation. And according to the regulation of JIS standard K5602, if the solar reflectance of the coating film was 40% or more, it was evaluated as “◯”, and if it was 40% or less, it was evaluated as “x”.

[Heat storage performance]
As an evaluation of the heat storage performance, a decorative sheet was bonded to one surface of an uncoated steel sheet having a length of 21 cm, a width of 29.7 cm, and a thickness of 0.5 mm to prepare a test piece. Then, a halogen bulb is installed at a position 15 cm away from the surface immediately above the surface of the test piece, and the temperature of one side and the other side of the test piece is changed every minute while irradiating with halogen light for 120 minutes. The maximum temperature was measured and recorded.

[Weatherability]
The accelerated weather resistance of the decorative sheet was evaluated using a metal halide lamp type ultra-accelerated weather resistance tester (Daipura Wintes Co., Ltd.). The test was performed under the conditions of a metal halide lamp irradiance of 650 W / m ² and a black panel temperature (test piece temperature) of 53 ° C. And after irradiation, the case where there was no remarkable change in the test piece was evaluated as “◯”, and the case where cracking or peeling of the surface resin layer (topcoat layer) occurred was evaluated as “x”.
Such an accelerated weather resistance test method is defined in JIS standard K5602.

  Table 1 summarizes the evaluation of the heat shielding performance, the heat storage performance, and the weather resistance. According to Table 1, the decorative sheets of Example 1 and Example 2 using an azomethine azo resin as a black pigment both obtained an evaluation of “◯” for weather resistance and heat shielding performance. On the other hand, although the decorative sheet of the comparative example obtained an evaluation of “◯” for the weather resistance, it was evaluated as “×” for the heat shielding performance.

  Moreover, about the thermal storage performance, although the test piece of Example 1 and Example 2 and all became 60 degreeC, the temperature of the test piece of the comparative example rose to 70 degreeC. Such a difference is considered to be caused by the fact that Example 1 and Example 2 use the black pigment of the azomethine azo resin, while the comparative example uses carbon black as the black pigment.

In addition, the inventors of the present invention apply the top coat layer by coating so that the solid content is 5 g / m ² or less and the solid content is 10 g / m ² or more. evaluated. Further, the inventors of the present invention evaluated the weather resistance and heat shielding properties by adding a resin other than the benzotriazole-based resin to the top coat layer. In this evaluation, the inventors of the present invention obtained results similar to those shown in Table 1.

Furthermore, the inventors of the present invention measured the transmittance of each ink used in the printed layer. The printing ink has an infrared light transmittance of 40% or more. Therefore, since the pattern printing layer 2 transmits infrared light, and the colored thermoplastic resin layer 1 reflects the transmitted infrared light, the heat storage action due to the heat of infrared light is reduced.
Here, as a method for measuring the transmittance of the ink (printing ink), for example, a pigment is dispersed so as to have a weight of 1 g / m ² with respect to a 25 μm-thick biaxially stretched PET film (Lumirror S50 manufactured by Toray Industries, Inc.). The transmittance of 860 measuring points is measured every 2 nm with a spectrophotometer UV3600 manufactured by Shimadzu Corporation, and the total value of transmittance (% T) of each wavelength. There is a method in which the division result obtained by dividing the value by the number of measurement points is used as the infrared light transmittance. That is, it is calculated by the formula “transmittance of infrared light = total measured transmittance (% T) of infrared wavelengths (782 nm to 2500 nm)” ÷ number of measurement points (860) ”.
From the above results, it can be seen that the inks used in Example 1 and Example 2 have a high transmittance for infrared light.

  The decorative base material and decorative sheet of the present invention described above are suitable for outdoor use because they do not easily warp even when exposed to sunlight.

DESCRIPTION OF SYMBOLS 1 Cosmetic material 10 Cosmetic sheet 11 Colored base material layer 13 Print layer 15 Overlay film layer 17 2nd adhesive layer 19 Topcoat layer 20 Base material 21 1st adhesive layer 111 Titanium oxide layer

Claims (4)

A coating layer is provided on one side of the colored substrate layer, the colored substrate layer is made of a polyolefin resin, the coating layer is made of an acrylic urethane resin containing a triazine ultraviolet absorber, and the coating layer Is 5 g / m ² or more and 10 g / m ² or less in terms of solid content,
A decorative sheet having a printing layer between the colored base layer and the coating layer, wherein the printing layer contains an azomethine azo pigment as a black pigment.   2. The colored substrate layer according to claim 1, wherein the one surface has a film containing at least one pigment of isoindolinone, disazo, polyazo, diketopyrrolopyrrole, quinacridone, phthalocyanine, and titanium oxide on the one surface. Makeup sheet.   The makeup according to claim 1, wherein the colored substrate layer contains at least one pigment of isoindolinone, disazo, polyazo, diketopyrrolopyrrole, quinacridone, phthalocyanine, and titanium oxide on the one surface side. Sheet.   A decorative material comprising the decorative sheet according to any one of claims 1 to 3 bonded to a base material.

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