JP2001105529A - Decorative panel and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] [Problem] To obtain a high-quality print result without being affected by the properties of ink when inkjet printing is performed on a decorative metal panel. SOLUTION: In the decorative panel, a galvanized layer 2, a primer layer 3, and a resin layer 4 are formed on a steel plate 1 (FIG. 1). When ink jet printing is performed on this, the ink is repelled by the resin layer 4 depending on the properties of the ink, and a high quality print result cannot be obtained. In the present invention, an ink absorbing layer 12 containing spherical SiO ₂ particles 10, a polyvinyl acetal resin and a water-soluble acrylic resin is formed on the surface of the resin layer 4. The ink absorbing layer 12 has an ink receiving property. When a pattern or the like is drawn on the ink absorbing layer 12 by ink jet printing, the ink is easily absorbed by the absorbing layer. Further, on the surface of the absorbing layer 12, a transparent protective film 13 for preventing a drawn pattern or the like from being damaged and giving glossiness is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative panel and a method of manufacturing the same, and more particularly, to a decorative metal panel in which a metal plate is covered with a resin layer and patterns and characters are drawn on the surface with ink. The present invention relates to a decorative metal decorative panel in which patterns, characters, and the like are drawn on a decorative metal panel with ink, and which is used for an elevator car, a door, and the like.

[0002]

2. Description of the Related Art As buildings become more sophisticated and fashionable, for example, elevator car walls and doors are required to include:
Metal decorative panels with decorations on the surface of which patterns, characters and the like are drawn have come to be used.

[0003] In such a decorative metal panel, a base resin layer is formed on a decorative metal panel in which a metal plate such as a steel plate is covered with a rust-preventive layer or an adhesive layer in order to enhance color development of ink. Patterns, characters, and the like are drawn on the surface of the resin layer by screen printing or inkjet printing. In addition, a transparent protective film is usually formed on the surface to protect drawn patterns, characters, and the like.

Japanese Patent Application Laid-Open No. 2-59068 describes screen printing on a decorative metal panel, and Japanese Patent Application Laid-Open No. 6-198 describes ink-jet printing.
No. 803, respectively.

[0005]

In general, screen printing requires a lot of complicated processing steps such as masking and exposure for preparing a screen plate, and requires a great deal of time for production.

In particular, in the case of performing multicolor printing, a screen plate having the same number of colors as the number of screen plates is required, and furthermore, a repetitive coating has to be performed.
On the other hand, in the inkjet printing, multicolor printing can be performed at one time, and the number of processes does not increase.

However, in a conventional decorative metal panel, only a resin layer is formed on the surface. Therefore, when drawing by ink jet printing, the ink is repelled by the resin layer depending on the properties of the base layer and the ink. And
There is a problem that a high quality print result cannot be obtained.

[0008] Japanese Patent Application No. 10-9296 proposes a method in which drawing is performed by ink-jet printing after a base treatment that is not easily affected by the properties of the ink is applied. In this case, it takes time to dry the ink.

To solve this problem, Japanese Patent Application No. 10-206425 proposes a method of providing an ink absorbing layer having excellent ink adhesion and drying properties.
Furthermore, the present inventors have conducted intensive studies, and as a result, have found a method that satisfies all of the specifications required for a decorative metal panel, such as the coloring properties of the ink and the adhesion including the protective film which is a transparent resin layer. .

[0010] An object of the present invention is to provide high quality printing without being affected by the properties of ink, even when a pattern, character, or the like is drawn on a metal component of an elevator car by, for example, ink jet printing. An object of the present invention is to provide a decoration which can obtain a result and which is excellent in the coloring properties of the ink and the adhesion as a panel.

[0011]

In order to solve the above-mentioned problems, the present invention is directed to a method in which a metal plate is covered with a resin layer and an ink absorbing layer made of inorganic particles is formed on the resin layer. is there. Further, the particles may be porous particles.

In particular, when a water-soluble resin, which is an ink receptor, is used for the ink absorbing layer, the color developability and sharpness of the ink are improved. When a resin having a hydroxyl group (OH) is included, the adhesive strength is improved. Further, when a transparent protective film is formed on the ink absorbing layer, gloss can be obtained on a drawn pattern or the like, and scratches can be prevented.

[0013] In the manufacturing process, an ink absorbing layer containing inorganic or porous particles, a polyvinyl acetal resin, and a water-soluble acrylic resin is formed on the resin layer covering the metal plate. A step of drawing a pattern or symbol on the ink absorbing layer with an aqueous pigment ink,
Forming a transparent protective film on the ink absorbing layer.

As the inorganic particles contained in the ink absorbing layer, silicon oxide particles having an average particle diameter of 1 to 10 μm are preferably used. Further, the solid content concentration ratio between the polyvinyl acetal resin and the water-soluble acrylic resin is preferably in the range of 1/10 to 5/1. Further, the viscosity of the coating solution used for the transparent protective film on the surface is desirably about 5 to 10 × 10 ⁻³ Pa · S.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view of a metal material. As shown in the figure, the metal-based material is such that a galvanized layer 2, a primer layer 3, and a resin layer 4 are formed on a steel plate 1 as a metal plate.

As the metal plate, for example, iron, aluminum, copper, nickel, lead, magnesium, tin, titanium, zirconium, cobalt, silver, platinum, chromium, tantalum,
Examples include zinc, stainless steel, and alloys in which two or more of them are mixed. Further, they include alloys containing non-metals such as silicon and carbon, but are not limited to those described herein.

As shown in FIG. 2, spherical Si as inorganic particles is formed on the surface of the resin layer 4 made of the metallic material.
An ink absorbing layer 12 composed of O ₂ particles 10 and a mixed resin 11 composed of a polyvinyl acetal resin and a water-soluble acrylic resin is formed.

The ink absorbing layer 12 is an ink receiving layer and has water absorbency and transparency. When a pattern, character, or the like is drawn on the surface with ink, the ink is applied to the ink absorbing layer 1.
2 easily absorbed and not repelled. Further, the absorbed ink is securely held until it is dried inside or on the surface of the ink absorbing layer 12. As a result, a colored pattern with ink can be easily formed.

In this case, it is desirable that the SiO ₂ particles 10, which are inorganic particles, have an oil absorption of about 30 to 50 ml / 100 g. If the oil absorption is less than 30 ml / 100 g, it will not function satisfactorily as an ink receiver.

When the amount is more than 50 ml / 100 g,
As will be described later, after drawing, when the protective film of the transparent resin layer is overcoated, the gas remaining on the particles replaces the solvent of the overcoat and floats on the surface, resulting in the generation of bubbles, And a high quality panel cannot be obtained.

The average particle size of the SiO ₂ particles is 1 to 1
0 μm is desirable. When the average particle size is smaller than 1 μm,
It has been confirmed that the film strength is increased, but the color developability of the ink is reduced. On the other hand, if it is larger than 10 μm, the color developability of the ink is improved, but the film strength is reduced. Preferably, the average particle size is 3 to 5 μm.

The polyvinyl acetal resin mixed in the ink absorbing layer is a polymer obtained by reacting polyvinyl alcohol with an aldehyde to form acetal. Since it is well dissolved in a solvent and the hydroxyl group (OH) reacts and crosslinks, it has high adhesive strength and strength, and adheres well to a polyester resin and SiO ₂ particles which are a resin layer of a metal-based material. On the other hand, a water-soluble acrylic resin functions as an ink receptor, but has no adhesive strength.

As described above, by optimizing the solid content concentration ratio between the polyvinyl alcohol resin and the water-soluble acrylic resin, it is possible to have both functions of the film strength and the ink coloring property. As a result of various studies, this concentration ratio
The range of 1/10 to 5/1 is desirable.

When the concentration ratio is less than 1/10, the film strength is satisfactory, but the color developability of the ink is poor. That is, the original color of the ink does not appear, and it is necessary to apply the ink twice or more. When the concentration ratio is larger than 5/1, the color developability of the ink is satisfied, but the film strength is poor. For example, when a peeling test using a cellophane tape is performed, peeling occurs at the interface between the underlying resin layer and the ink absorbing layer. Preferably, the solid content concentration ratio between the polyvinyl alcohol resin and the water-soluble acrylic resin is in the range of 1/3 to 3/1.

Next, for drawing of patterns, character symbols, etc., either pigment type or dye type inks may be used, but pigment types excellent in weather resistance and color fade resistance are desirable. As an application method, an ink jet system capable of obtaining a high-definition image is desirable.

Transparent protective film 1 to be the final finished surface of panel
Reference numeral 3 is applied as a protective film for obtaining a gloss of a pattern or a character or the like drawn in the previous process, and at the same time, preventing damage due to external force. Usually, it is performed by spray coating.

In this case, as the coating solution, a mixed solution of a resin component, a thinner as a diluent and a curing agent is used.
When the viscosity of this solution is lower than 5 × 10 ⁻³ Pa · S, that is, when there is a large amount of thinner as a diluent, the solution penetrates into the inside of the ink absorbing layer, but the protective film becomes thin because the resin component is small. As a result, gloss cannot be obtained and scratch resistance is poor.

On the other hand, when the solution viscosity is higher than 10 × 10 ⁻³ Pa · S, the protective film is sufficiently thick and has excellent scratch resistance, but the solution hardly penetrates into the inside of the ink absorbing layer. Is stopped at the upper portion of the protective layer, and thus peels off at the interface between the absorbing layer and the protective film. Therefore, the viscosity of the solution is 5
A range of 10 × 10 ⁻³ Pa · S is desirable.

<Embodiment 1> FIG. 3 shows a manufacturing process of a decorative metal panel. 180cm in height as a metal material,
A steel plate having a width of 80 cm and a thickness of about 1.2 mm was used. As shown in FIG. 1, the steel sheet 1 is subjected to electrogalvanizing,
A zinc plating layer 2 is formed on the surface, and a primer layer 3 and a polyester resin layer 4 are further formed thereon.

As a first step, the surface of the panel shown in FIG. 1 is washed with a neutral detergent (S1). After washing, drying was performed with compressed air. Note that washing with an organic solvent such as alcohol or running water washing may be used instead of the neutral detergent.

In the next step, a coating liquid for forming an ink absorbing layer is prepared (S2). Average particle size 3μm, oil absorption 150m
1 / 100g porous SiO ₂ particles (H31 manufactured by Asahi Glass)
0.1 wt%, 3.75 wt% of polyvinyl acetal resin (manufactured by Sekisui Chemical, KW-1), and 1.25 wt% of water-soluble acrylic resin (manufactured by Nippon Pure Chemical, SP-50TF) were mixed with water to form a coating solution. . Therefore, the ratio between the polyvinyl acetal resin and the water-soluble acrylic resin is 3: 1.

In the next step, this coating solution is applied to the surface of the polyester resin 4 by spray coating (S3), and further dried (S4) to have a film thickness of about 30 μm on the metallic material. A transparent film was formed as an ink absorbing layer.

Next, an ink jet printing apparatus (PRP-22, manufactured by Pentel Co., Ltd.) is provided on the surface of the transparent film.
), And inkjet printing was performed (S5) and dried (S6). As a result, arbitrary character symbols, patterns, and the like could be easily drawn without bleeding.

Further, as a transparent protective film, an acrylic resin-based protective layer coating liquid was prepared by mixing 400 g of a resin base material (manufactured by Isamu Paint, Hiart # 3000), 415 g of thinner as a diluent, and 50 g of a curing agent. Spray painting (S7). The viscosity of the coating liquid at this time is 8 × 10 ⁻³ P
a · S.

The image formed through the above-described processes can provide a high-definition image as compared with conventional screen printing and the like, and at the same time, the overcoating of the protective layer increases the scratch resistance due to external force, resulting in a glossy image. An image having excellent properties was obtained.
In addition, the adhesion between the ink absorbing layer and the transparent protective film was good, and a peel test according to JIS K5400 was performed.

<Embodiment 2> Next, Embodiment 2 of the present invention.
An ink-absorbing film similar to the ink-absorbing layer in the first embodiment was applied to an elevator door or a steel plate for a car inner plate, and arbitrary drawing was performed on the surface by inkjet printing.

Thereafter, an acrylic urethane resin was spray-coated as a protective film, dried, and further buffed to finish the surface. In this way, it is possible to easily draw arbitrary patterns, character symbols, and the like on the constituent members of the elevator, and to provide an aesthetically-excellent decoration that gives a favorable impression to people.

In the above description, SiO ₂ particles are exemplified as the inorganic particles, but the present invention is not limited to this. Any particles can be used as long as they can form a porous layer that easily absorbs ink. As such particles, besides SiO ₂ particles, for example, Al ₂ O ₃ , TiO ₂ , ZrO ₂ , WO ₃ ,
Particles such as can also be used.

Similarly, in addition to the water-soluble acrylic resin, examples of the water-soluble resin serving as the ink receptor include epoxy resin, polyvinyl alcohol, cellulose resin, and the like.
Etc. can be used. Further, as the resin for improving the adhesive strength, besides polyvinyl acetal resin, polyamide, polyvinyl acetate, amino resin, silicone resin and the like can be used.

[0040]

As described above, according to the present invention,
Since a transparent ink absorbing layer containing inorganic or porous particles and resin and having water absorption is formed on the resin film covering the metal material, the properties of the ink when performing inkjet printing , And a high-quality print result can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a metal-based material to which the present invention is applied.

FIG. 2 is a schematic sectional view showing a main part of the decorative metal panel of the present invention.

FIG. 3 is a view showing a manufacturing process of the decorative metal panel according to the first embodiment of the present invention.

[Explanation of symbols]

1 steel plate 2 galvanized layer 3 primer layer 4 resin layer 10 spherical SiO ₂ particles 11 polyvinyl acetal resin and a water-soluble mixed resin 12 ink absorbing layer 13 transparent protective film of the acrylic resin

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Masanori Kondo 1070 Ma, Hitachinaka-shi, Ibaraki Pref. Inside Mito Works, Hitachi, Ltd. Inside Mito Works (72) Inventor Yoshishige Endo 502 Kandamachi, Tsuchiura-shi, Ibaraki Pref. AK01B AK01C AK23C AK25C AK41 AR00C AR00D BA04 BA07 BA10A BA10D DE01C DJ00C EH46 EH71 EJ65 GB90 HB31 JA20C JB09C JD14C JN01D YY00C

Claims (10)

[Claims] 1. A decorative panel in which a metal plate is covered with a resin layer, and an ink absorbing layer made of inorganic particles is formed on the resin layer. 2. A decorative panel comprising a metal plate covered with a resin layer, and an ink absorbing layer made of porous particles formed on the resin layer. 3. The decorative panel according to claim 1, wherein the ink absorbing layer contains a water-soluble resin that is an ink receptor. 4. The ink absorbing layer has a hydroxyl group (OH).
The decorative panel according to claim 1, comprising a resin having: 5. A decorative panel in which a metal plate is covered with a resin layer and has a transparent protective film on the surface of the resin layer,
An ink absorbing layer comprising inorganic or porous particles, a water-soluble resin as an ink receptor, and a resin having a hydroxyl group (OH) is formed between the resin layer and the transparent protective film. Decorative panel characterized by the following. 6. An elevator component manufactured for an elevator car using the decorative panel according to claim 1. Description: 7. An inorganic or porous particle and a polyvinyl acetal resin on a resin layer coated on a metal plate.
A step of forming an ink absorbing layer containing a water-soluble acrylic resin, a step of drawing a pattern or a character symbol with an aqueous pigment ink on the ink absorbing layer, and a step of forming a transparent layer on the ink absorbing layer after the drawing step. Forming a protective film. 8. The method according to claim 1, wherein the inorganic particles have an average particle size of 1 to 1.
The method for producing a decorative panel according to claim 7, wherein 0 μm silicon oxide particles are used. 9. The solid content ratio of the polyvinyl acetal resin and the water-soluble acrylic resin contained in the ink absorbing layer is in the range of 1/10 to 5/1.
3. The method for producing a decorative panel according to item 1. 10. The coating solution used as the transparent protective film has a viscosity of 5 to 10 × 10 ⁻³ Pa · S.
10. The method for producing a decorative panel according to 8 or 9.