JP2022093499A - Decorative sheet and decorative plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative sheet and a decorative plate capable of maintaining stable adhesive strength.

SOLUTION: A decorative sheet 1 includes a primer layer 6 laminated on one side of a base material sheet 2. A decorative plate 100 is formed through adhering a substrate 10 on the decorative sheet 1 by an adhesive layer 20. The adhesive layer 20 contains an aqueous adhesive or a polyurethane-based hot-melt adhesive. The primer layer 6 contains: a mixture body obtained by blending an urethane resin, a vinyl chloride-vinyl acetate copolymer resin, and a cellulosic resin at a mixture ratio of 70:20:10 by mass; and a silica added to the mixture body. An average particle diameter of the silica is within a range of 2 to 4 [μm], inclusive. An added amount of the silica is within a range of 20 to 60 pts. mass, inclusive, based on the mixture body 100 pts. mass.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a decorative sheet and a decorative board used for improving the design of the interior and exterior of a building (residential or non-residential).

Conventionally, as a decorative sheet used for improving the design of interiors and exteriors of buildings (residential and non-residential), for example, there is a technique described in Patent Document 1.
The technique described in Patent Document 1 is a polyolefin-based decorative sheet in which a polyurethane-based backcoat layer is formed as a backside primer on the back surface (adhesive surface). Then, in the technique described in Patent Document 1, the polyurethane-based backcoat layer is bonded to the surface of the wood base material with an aqueous adhesive of acrylic resin or vinyl acetate resin to form a decorative board.

Japanese Patent No. 3147735

In many cases, a decorative layer or the like is formed by printing a pattern on a decorative sheet with an ink obtained by mixing urethane and a vinyl chloride-vinyl acetate copolymer resin.
However, as in the technique described in Patent Document 1, ink is printed on a decorative sheet manufactured by forming a decorative layer or the like printed with ink on a film raw material such as polypropylene (PP) or polyethylene (PE). Later, there is a high possibility that the wound sheets will stick to each other.
Therefore, when the decorative sheet is stored in the form of a roll, the original films are in close contact with each other and blocking occurs. If the blocking strength is increased, problems such as ink peeling and film raw fabric cutting may occur when the print roll is peeled off.
The present invention has been made focusing on the above-mentioned problems, and an object of the present invention is to provide a decorative sheet and a decorative board capable of maintaining stable adhesive strength.

In order to solve the above problems, one aspect of the present invention is a decorative sheet provided with a primer layer laminated on one surface of a base sheet. The primer layer was added to a mixture of a urethane resin, a vinyl chloride-vinyl acetate copolymer resin, and a cellulose resin in a mixing ratio of 70:20:10 by mass ratio, and to the mixture. Includes silica. The average particle size of silica is in the range of 2 μm or more and 4 μm or less, and the amount of silica added is in the range of 20 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the mixture.
Further, in order to solve the above-mentioned problems, one aspect of the present invention is a decorative board formed by attaching a substrate to a decorative sheet with an adhesive layer, and the adhesive layer faces the decorative sheet of the substrate. It is laminated on the surface and contains a water-based adhesive or a polyurethane-based hot melt adhesive.

According to one aspect of the present invention, the urethane resin, the vinyl chloride-vinyl acetate copolymer resin, and the cellulose resin are mixed with respect to the primer layer of the decorative sheet, and the average particle size is within the range of 2 μm or more and 4 μm or less. Add silica. This makes it possible to provide a decorative sheet and a decorative board capable of maintaining stable adhesive strength.

It is sectional drawing which shows the structure of the decorative sheet and the decorative board of the 1st Embodiment of this invention.

The first embodiment of the present invention will be described below with reference to the drawings. In the description of the drawings referred to in the following description, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the plane dimensions, the ratio of the thickness of each layer, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following explanation. In addition, it goes without saying that the drawings include parts having different dimensional relationships and ratios from each other.

Further, the first embodiment shown below exemplifies a non-combustible decorative plate for embodying the technical idea of the present invention, and the technical idea of the present invention describes the materials of constituent parts and their components. The shape, structure, arrangement, etc. are not specified to the following. The technical idea of the present invention can be modified in various ways within the technical scope specified by the claims described in the claims. Further, the directions of "left and right" and "up and down" in the following description are merely definitions for convenience of explanation, and do not limit the technical idea of the present invention. Therefore, for example, if the paper surface is rotated 90 degrees, "left and right" and "up and down" are read interchangeably, and if the paper surface is rotated 180 degrees, "left" becomes "right" and "right" becomes "left". Of course, it becomes.

(First Embodiment)
Hereinafter, the first embodiment of the present invention will be described with reference to the drawings.
(Veneer)
The configuration of the decorative board 100 will be described with reference to FIG. 1.
As shown in FIG. 1, the decorative board 100 includes a substrate 10, an adhesive layer 20, and a decorative sheet 1, and one surface of the substrate 10 (in FIG. 1, the upper surface of the substrate 10). That is, the decorative sheet 1 is bonded to the substrate 10 by using the adhesive layer 20 laminated on the surface of the substrate 10 facing the decorative sheet 1.

(substrate)
The substrate 10 is formed of, for example, a veneer, plywood, fiber board, composite material, laminated lumber or the like using cedar, cypress, oak, lauan, teak or the like as materials.
In the first embodiment, a case where a medium density fiberboard (MDF) is used as the substrate 10 will be described. That is, the substrate 10 included in the decorative board 100 of the first embodiment is an MDF base material.
MDF is a type of molded board (fiber board) made from wood fiber, which is made by steaming and defibrating wood chips, adding synthetic resin as an adhesive, and hot-pressing into a plate shape. .. Further, MDF has smaller components (segments) than particle board or oriented strand board (OSB) made of the same wood chip as a raw material, and not only the surface but also the end portion is smooth.
As the substrate 10, a particle board or an oriented strand board (OSB) may be used. Further, as the substrate 10, it is also possible to use a plastic film, paper, metal, cloth, leather, glass, ceramics and the like.

(Adhesive layer)
The adhesive layer 20 is formed by, for example, drying and curing the adhesive, and contains a water-based adhesive or a polyurethane-based hot melt adhesive.
Water-based adhesives are relatively safe with less risk of ignition and toxicity. Then, as the water-based adhesive, for example, an emulsion adhesive can be used.
The emulsion adhesive is an adhesive in which a polymer of a synthetic resin is uniformly dispersed in water, and has an anchoring effect of penetrating into the gaps of an adherend and hardening like a wedge. As the emulsion adhesive, for example, a urethane-modified ethylene-vinyl acetate polymer is used as a main agent, and an aliphatic isocyanate is used as a curing agent.

The conditions such as the drying temperature and the drying time of the water-based adhesive are not particularly limited, and may be appropriately set according to the type of the adhesive.
As the polyurethane-based hot-melt adhesive, for example, a one-component moisture-curable urethane hot-melt adhesive or the like (manufactured by DIC Corporation: "Tyforce FH315" or the like) can be used.
The hot melt adhesive is solid at room temperature, but is applied to the adherend in a liquefied state by heating and melting in the range of 80 [° C.] or more and 100 [° C.] or less, and forms a bond by cooling solidification. It is a thermoplastic adhesive. In addition, the hot melt adhesive cures quickly and does not use a solvent, so it does not generate gas.

In particular, the polyurethane-based hot melt adhesive contains a polyurethane-based uncured resin (prepolymer) as a main component, and after being heated and dissolved, reacts with moisture (moisture) in the air and cures. Then, once the reaction is completed, a tough film is formed and a strong adhesive force is exhibited. In addition, the polyurethane-based hot-melt adhesive that has completed the reaction is not melted by heat again, and is therefore excellent in heat resistance and cold resistance. Furthermore, since the polyurethane-based hot melt adhesive has a tough film and strong adhesive performance, it is possible to reduce the coating amount.
The method for forming the adhesive layer 20 is not particularly limited. For example, a roll coat, a curtain flow coat, a wire bar coat, a reverse coat, a gravure coat, a gravure reverse coat, an air knife coat, a kiss coat, a blade coat, a smooth coat, a comma coat and the like can be used.

(Cosmetic sheet)
The configuration of the decorative sheet 1 will be described with reference to FIG. 1.
The decorative sheet 1 is a sheet-shaped decorative material for imparting design to one surface of the substrate 10.
As shown in FIG. 1, the decorative sheet 1 includes a base sheet 2, a decorative layer 4, and a primer layer 6. Further, in the decorative sheet 1, the primer layer 6 is laminated on one surface of the base sheet 2 (the lower surface of the base sheet 2 in FIG. 1), and the other surface of the base sheet 2 (FIG. 1). Inside, the decorative layer 4 is laminated on the upper surface of the base sheet 2).
The configuration of the decorative sheet 1 excluding the primer layer 6 is not particularly limited.

(Base sheet)
The base material sheet 2 is a sheet-like layer formed by using a resin film.
The resin film forming the base material sheet 2 is not particularly limited, and a known resin film can be used.
That is, as the resin film forming the base sheet 2, for example, a polyolefin-based resin, an ethylene-vinyl acetate copolymer, or a sacrifice thereof, a polyolefin such as an ethylene- (meth) acrylic acid (ester) copolymer or the like. It is possible to use a system copolymer. In addition to this, the resin film forming the base material sheet 2 includes, for example, polyester resin, acrylic resin such as polymethylmethacrylate, polyamide resin, styrene resin, fibrous derivative, chlorine resin, and fluorine resin. It is possible to use resin or the like.

As the above-mentioned material, a simple substance or a selected mixture of two or more kinds, a copolymer, a composite, a laminate, or the like can be appropriately used.
In particular, in manufacturing using a melt extrusion device, in consideration of productivity, environmental compatibility, mechanical strength, durability, price, etc., it is more preferable to use a polyolefin resin as the resin film forming the base sheet 2. preferable. Further, the resin film forming the base sheet 2 may be colored by mixing a pigment to set the base color according to the design of the decorative sheet 1.

In the first embodiment, as an example, a case where the base sheet 2 is formed by using a polyolefin-based resin or a polyester-based resin will be described.
Polyolefin is a kind of plastic (resin), and is composed only of carbon (C) and hydrogen (H) such as polyethylene (PE) or polypropylene (PP), and when burned, it is water (H2).
It is a resin that becomes O) and carbon dioxide (CO2).
As the polyolefin-based resin, for example, polyethylene, polypropylene, polybutene, polymethylpentene and the like can be used.

As the polyester-based resin, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyarylate, polycarbonate, copolymerized polyester and the like can be used.
As the copolymerized polyester, for example, 1,4-cyclohexanedimethanol copolymerized polyethylene terephthalate resin (commonly known as “PET-G”) can be used.
As the polyamide resin, for example, 6-nylon, 6,6-nylon, 6,10-nylon, 12-nylon and the like can be used.
As the styrene-based resin, for example, polystyrene, AS resin, ABS resin and the like can be used.

As the fibrin derivative, for example, cellulose acetate, nitrocellulose and the like can be used.
As the chlorine-based resin, for example, polyvinyl chloride, polyvinylidene chloride or the like can be used.
As the fluororesin, for example, polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer and the like can be used.
As the base material sheet 2, for example, a paper base material such as oil-resistant paper having oil resistance can be used.

(Cosmetic layer)
The decorative layer 4 is a layer in which a pattern for imparting design to the decorative sheet 1 is formed by printing, and is composed of a plurality of layers. The plurality of layers constituting the decorative layer 4 include, for example, a thermoplastic resin layer, a pattern layer, and a surface protective layer, and the layer structure of the decorative layer 4 is not limited to this.
The thermoplastic resin layer is provided for the purpose of enhancing the design of the decorative material, and is also called a concealing layer that gives an intended color to the surface of the base sheet 2 or a solid layer on the entire surface, and is also called a base sheet 2. It is a uniform and uniform layer that covers the other surface of the entire surface.
Further, the thermoplastic resin layer is usually formed in an opaque color, but it may be formed in a colored transparent state to make the best use of the pattern of the base. Further, the thermoplastic resin layer may be formed colorless and transparent when taking advantage of the white color of the film.

The pattern layer imparts a design property with a desired pattern to the surface of the thermoplastic resin layer opposite to the surface facing the base sheet 2, and the type of the pattern is not particularly limited. ..
As the pattern, for example, a wood grain pattern, a stone grain pattern, a sand grain pattern, a tiled pattern, a brick pile pattern, a cloth grain pattern, a leather squeezing pattern, a geometric figure, a character, a symbol, an abstract pattern, etc., where the decorative sheet 1 is used. It is possible to select a pattern suitable for.
The printing ink forming the decorative layer 4 is not particularly limited in consideration of printability, weather resistance, and the like, and known printing inks can be used.
Therefore, as the printing ink forming the decorative layer 4, for example, letterpress ink, flat plate ink, intaglio gravure ink, stencil screen ink, and the like can be used. Further, as the printing ink forming the decorative layer 4, for example, any of oil ink, solvent ink, and water-based ink can be used from the system of the medium.

As the resin component used for the printing ink forming the decorative layer 4, for example, any one of casein, den powder, polyvinyl alcohol, hydroxyethyl cellulose, water-soluble salt, latex, and polyethylene-based Dispurgegon can be used.
Examples of the water-soluble salt include a sodium carboxymethyl cellulose salt; a water-soluble salt of a styrene-maleic acid-based copolymer and a water-soluble salt (meth) acrylic ester-based (co) heavy of an inbutylene-maleic acid-based copolymer. It is possible to use a combined water-soluble salt. In addition to this, as the water-soluble salt, for example, a water-soluble salt of a styrene- (meth) acrylic ester-based copolymer can be used.

As the latex, for example, a water-soluble alkyd resin or the like; a styrene-butagen copolymer latex, a (meth) acrylic ester-based copolymer latex, or a styrene- (meth) acrylic ester-based copolymer latex can be used. .. In addition to this, as the latex, for example, (meth) acrylic ester-butagen-based copolymer latex, ethylene-vinyl acetate-based copolymer latex, and ethylene- (meth) acrylic ester-based copolymer latex can be used. Is.

Further, by blending a pigment in combination with the printing ink forming the decorative layer 4, it is possible to enrich the expression of the pattern. Further, by adding an ultraviolet absorber, a light stabilizer, or the like to the printing ink forming the decorative layer 4, it is possible to improve the weather resistance.
As a pattern printing method, known printing methods such as gravure printing, offset printing, silk screen printing, and inkjet printing can be used.
In particular, when the same color is colored on the entire surface, a coating method or apparatus may be used in addition to the above-mentioned printing method.

The surface protective layer is a layer that protects the surface of the pattern layer, and is also called a coat layer (coating layer).
Further, the surface protective layer is a thermoplastic resin layer or a uniform and uniform member that covers the entire surface of the pattern layer.
The material of the surface protective layer is not particularly limited, but preferably contains an ionizing radiation curable resin or a two-component curable urethane resin as a resin component, and is formed from these resins. Is preferable.
When the surface protective layer is formed of an ionizing radiation curable resin or a two-component curable urethane resin, the abrasion resistance, impact resistance, stain resistance, scratch resistance, weather resistance, etc. of the decorative material are improved. It is possible.

(Primer layer)
The primer layer 6 is formed by applying a primer (primer) to one surface of the base sheet 2. Further, the primer layer 6 formed on one surface of the base sheet 2 may be referred to as a back surface primer.
The primer is a low-viscosity liquid with a low non-volatile content, which is applied to improve the adhesiveness of the surface of the adherend. When the adhesive is applied on the primer layer 6, the adhesive is applied again when the primer is sufficiently dried. The type of primer differs depending on the type of adherend and adhesive.

In the first embodiment, the main components of the primer layer 6 are a urethane resin, a vinyl chloride-vinyl acetate copolymer resin (hereinafter, may be referred to as "vinyl acetate resin"), and a cellulose resin. It is assumed that the composition is formed by containing a mixture of and. The main component represents, for example, 70% by mass or more of the whole.
The mixing ratio of the urethane resin, the vinyl chloride-vinyl acetate copolymer resin, and the cellulose resin in the mixture is 70:20:10 in terms of mass ratio.
Examples of the cellulose resin include cellulose resins having an ester group and cellulose acetate. Cellulose may be natural or artificial.
The amount of the cellulose resin added is in the range of 3 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the mixture.

Further, silica and a curing agent are added to the resin as the main component.
The average particle size of silica is in the range of 2 [μm] or more and 4 [μm] or less.
The amount of silica added is in the range of 20 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the mixture.
The amount of the curing agent added is in the range of 2 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the mixture.

The above-mentioned first embodiment is an example of the present invention, and the present invention is not limited to the above-mentioned first embodiment, and even if it is an embodiment other than this embodiment, it relates to the present invention. Various changes can be made according to the design, etc., as long as they do not deviate from the technical idea.

(Effect of the first embodiment)
In the case of the decorative sheet 1 of the first embodiment, the primer layer 6 is mixed with a urethane resin, a vinyl chloride-vinyl acetate copolymer resin, and a cellulose resin in a mixing ratio of 70:20:10 by mass ratio. Add the body and silica having an average particle size in the range of 2 [μm] or more and 4 [μm] or less. In addition to this, the amount of silica added is set within the range of 20 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the mixture.
As a result, it becomes possible to provide the decorative sheet 1 capable of maintaining stable adhesive strength.

Further, in the case of the decorative plate 100 of the first embodiment, the adhesive layer 20 for attaching the decorative sheet 1 to the substrate 10 is laminated on the surface of the substrate 10 facing the decorative sheet 1, and is a water-based adhesive or a polyurethane-based adhesive. Contains hot melt adhesive.
As a result, it is possible to provide a decorative plate 100 capable of maintaining stable adhesive strength even when the decorative sheet 1 is attached to the substrate 10 with a water-based adhesive or a polyurethane-based hot melt adhesive. It will be possible.

As described below, with reference to FIG. 1 of the first embodiment, the performance evaluation of the adhesive strength of the decorative board of the example and the decorative board of the comparative example will be described using a peeling test. Table 1 shows the configurations of Examples and Comparative Examples and the test results.

(Example 1)
The decorative board of Example 1 has the following configuration.
Substrate: MDF base material with a thickness of 3 mm Base material sheet: Main component of a 0.07 mm thick polypropylene resin raw fabric primer layer: Mixing ratio of a mixture of urethane resin, salted vinegar resin, and cellulosic resin: Urethane System resin 70: Salt and vinegar resin 20: Cellulose resin 10
Amount of primer applied: 0.6 or more [g / m ² dry] 0.9 [g / m ² dry] or less Addition amount of curing agent: 3 parts by mass of silica with respect to 100 parts by mass of the mixture Addition amount: 33 parts by mass with respect to 100 parts by mass of the mixture Average particle size of silica: 2 [μm]
The amount of silica added is set to 100 parts by mass of the organic resin contained in the paint.

(Example 2)
The decorative board of Example 2 has the same configuration as the decorative board of Example 1 except that the amount of silica added is 50 parts by mass with respect to 100 parts by mass of the mixture.
(Example 3)
The decorative board of Example 3 has the same configuration as the decorative board of Example 1 except that the average particle size of silica is 4 [μm].
(Example 4)
The decorative plate of Example 4 is the same as that of Example 1, except that the amount of silica added is 50 parts by mass with respect to 100 parts by mass of the mixture and the average particle size of silica is 4 [μm]. It has the same structure as a decorative board.

(Comparative Example 1)
The decorative board of Comparative Example 1 has the same configuration as the decorative board of Example 1 except that the amount of silica added is 8 parts by mass with respect to 100 parts by mass of the mixture.
(Comparative Example 2)
The decorative board of Comparative Example 2 has the same configuration as the decorative board of Example 1 except that the amount of silica added is 17 parts by mass with respect to 100 parts by mass of the mixture.
(Comparative Example 3)
The decorative plate of Comparative Example 3 is of Example 1 except that the amount of silica added is 17 parts by mass with respect to 100 parts by mass of the mixture and the average particle size of silica is 4 [μm]. It has the same structure as a decorative board.

(Performance evaluation)
The following tests were conducted as peeling tests after the environmental test.
The primer layer provided in the decorative boards of Examples and Comparative Examples is adhered to the substrate with an aqueous adhesive. Then, after cutting the decorative board to a width of 25 [mm] in an atmosphere of 60 [° C.], one end portion is peeled off from the base material, the decorative sheet at the tip portion is peeled off, and a weight of 500 [g] is placed. Further, the peeled decorative sheet was left for 1 hour in a state of being pulled by applying a load of 500 [g] in the 90 [°] direction, and the peeling length (peeling distance) between the base material and the decorative sheet was measured.

(Evaluation results)
In Examples 1 to 4, the peeling distance was 1.0 [mm]. In Comparative Example 1 and Comparative Example 3, the peeling distance was 1.5 [mm], and in Comparative Example 2, the peeling distance was 2.0 [mm].
Therefore, it was confirmed that the decorative sheet and the decorative board of the example can maintain stable adhesive strength as compared with the decorative sheet and the decorative board of the comparative example.

The decorative sheet and decorative board of the present invention are used for interiors such as floors, walls and ceilings of buildings, surface decorative materials for furniture and various cabinets, surface decorative materials for fittings, and surface decorative materials used for vehicle interiors and the like. It is possible.

1 ... decorative sheet, 2 ... base sheet, 4 ... decorative layer, 6 ... primer layer, 10 ... substrate, 20 ... adhesive layer, 100 ... decorative board

Claims (3)

A decorative sheet provided with a primer layer laminated on one surface of a base sheet.
The primer layer is a mixture of a urethane resin, a vinyl chloride-vinyl acetate copolymer resin, and a cellulose resin in a mixing ratio of 70:20:10 by mass ratio, and is added to the mixture. Including silica,
The average particle size of the silica is in the range of 2 μm or more and 4 μm or less.
The decorative sheet is characterized in that the amount of silica added is in the range of 20 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the mixture. The decorative sheet according to claim 1, wherein the amount of the cellulose resin added is in the range of 3 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the mixture. A decorative board formed by attaching a substrate with an adhesive layer to the decorative sheet according to claim 1 or 2.
The adhesive layer is laminated on the surface of the substrate facing the decorative sheet, and is characterized by containing a water-based adhesive or a polyurethane-based hot melt adhesive.

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