JP6558121B2 - Decorative sheet and decorative board - Google Patents

Description

  The present invention relates to a decorative sheet and a decorative board. These decorative sheets and decorative plates are used, for example, for interior materials and furniture.

Patent Document 1 discloses a polyolefin decorative sheet.
A polyurethane-based backcoat layer is formed on the back surface (adhesive surface) of the polyolefin-based decorative sheet as a back surface primer. Then, the polyurethane backcoat layer is bonded to the surface of the wood substrate with an acrylic resin or vinyl acetate resin aqueous adhesive applied to form a decorative board.

Japanese Patent No. 3147735

The inventors have confirmed that, in recent years, the adhesive for adhering a decorative sheet to a base material is not limited to an aqueous adhesive of acrylic resin or vinyl acetate resin, but a one-part moisture-curing urethane, due to product development, technological trends, etc. It has been found that PUR (Poly Ureethane Reactive) hot melt adhesives such as hot melt adhesives are beginning to be used.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a decorative sheet and a decorative plate having a primer layer that can cope with adhesion with at least a water-based adhesive and a PUR hot melt adhesive. To do.

In order to solve the above problems, a decorative sheet according to one embodiment of the present invention is a decorative sheet having a primer layer on the back surface of a base sheet, and the primer layer includes polyester polyol and vinyl chloride as main components. It consists of a mixture with a vinyl acetate copolymer resin, and silica and cellulose resin having an average particle size of 3 μm or less are added to the main component.
The decorative board according to one aspect of the present invention is a decorative board in which a decorative sheet is bonded to a base material via an adhesive layer made of an aqueous adhesive or a polyurethane-based hot melt adhesive, The decorative sheet is a decorative sheet according to the above aspect.

  According to one aspect of the present invention, a polyester chloride is mixed with a vinyl chloride-vinyl acetate copolymer resin and a silica having a mean particle size of 3 μm or less and a cellulose resin are added to the primer layer of the decorative sheet. It is possible to maintain a stable adhesive strength even if it is bonded to a substrate with any one of an aqueous adhesive and a PUR hot melt adhesive.

It is sectional drawing which shows the laminated structure of the decorative board which concerns on embodiment of this invention.

Next, embodiments of the present invention will be described with reference to the drawings.
Here, the drawings 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. Further, the embodiment described below exemplifies a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention is that the material, shape, structure, etc. of the component parts are as follows. It is not something specific. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.
As shown in FIG. 1, the decorative board of this embodiment is configured by laminating a decorative sheet 1 on an upper surface of a base material 6 with an adhesive layer 5 interposed therebetween. That is, the primer layer 4 constituting the back surface of the decorative sheet 1 is attached to the surface of the substrate 6 with the adhesive constituting the adhesive layer 5.

<Decoration sheet 1>
The decorative sheet 1 is a sheet-shaped decorative material for imparting design properties to the surface of the substrate 6. The decorative sheet 1 is not particularly limited except for the primer layer 4 constituting the back surface.
As shown in FIG. 1, the decorative sheet 1 of the present embodiment has a decorative layer 3 formed on the surface of the base sheet 2 and a primer layer 4 formed on the back surface of the base sheet 2.

The base material sheet 2 of this embodiment is comprised from the resin film, for example, for example, is comprised from sheets, such as polyolefin and polyester. Polyolefin is a kind of plastic (resin), and is composed of only carbon (C) and hydrogen (H) such as polyethylene (PE) or polypropylene (PP), and when burned, water (H ₂ O) and carbon dioxide (CO ₂ ). ) Etc.

Examples of the polyester include polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), and polybutylene naphthalate (PBN). Further, as the base sheet 2, a paper base 6 such as oil-resistant paper having oil resistance can also be used.
The decorative layer 3 is laminated on the surface of the base sheet 2 and is composed of a plurality of layers. The decorative layer 3 includes, for example, a thermoplastic resin layer, a picture layer, and a surface protective layer. However, the layer structure of the decorative layer 3 is not limited to this.

  The thermoplastic resin layer is provided for the purpose of improving the design of the decorative material, and is also referred to as a concealing layer or a full-surface solid layer that imparts the intended color to the surface of the base material sheet 2. A uniform and uniform layer covering the entire side. The thermoplastic resin layer is usually formed with an opaque color in many cases, but it may be formed with colored and transparent to make use of the pattern of the base. Moreover, when taking advantage of the fact that the film is white, it may be formed in a colorless and transparent manner.

The pattern layer imparts design properties with a desired pattern to the surface side of the thermoplastic resin layer, and the type of the pattern is not particularly limited. Examples thereof include a wood grain pattern, a stone pattern, a grain pattern, a tiled pattern, a brickwork pattern, a cloth pattern, a leather pattern, a geometric figure, a character, a symbol, and an abstract pattern.
A surface protective layer is a layer which protects the surface of a printing layer or a pattern layer, and is also called a coating layer (coating layer). The surface protective layer is a uniform and uniform member that covers the entire surface of the surface side of the thermoplastic resin layer or the picture layer. The surface protective layer is not limited, but preferably contains an ionizing radiation curable resin or a two-component curable urethane resin as a resin component. Substantially those formed from these resins are preferred. When the resin layer is formed of an ionizing radiation curable resin or a two-component curable urethane resin, it is easy to improve the abrasion resistance, impact resistance, contamination resistance, scratch resistance, weather resistance, etc. as a decorative material.

<Primer layer 4>
A primer layer 4 is formed on the back surface of the base sheet 2.
The primer layer 4 can be formed by applying a primer (primer) to the back surface of the base sheet 2. The primer applied to the back surface (adhesive surface side) may be referred to as a back surface primer.

The primer is a low-viscosity liquid with a small non-volatile content applied to improve adhesion on the surface of the adherend. When applying an adhesive on the primer layer 4, the adhesive is applied again when the primer is sufficiently dry. The type of primer varies depending on the type of adherend and adhesive.
In the primer layer 4 according to the present embodiment, the main component is a mixture of a polyester polyol and a vinyl chloride-vinyl acetate copolymer resin (hereinafter sometimes referred to as a vinyl acetate resin). A main component refers to 70 mass% or more of the whole, for example.

The mixing ratio of the polyester polyol and the vinyl acetate resin in the mixture is preferably in the range of 90:10 to 70:30 in terms of mass ratio.
In addition, it is preferable that silica, a curing agent, and a cellulose resin are added to the main component resin.
The silica to be added has an average particle size of 3 μm or less and is preferably added in an amount of 0.8 parts by mass or more and 4 parts by mass or less with respect to 100 parts by mass of the main component. It is estimated that the finer the particle size of the silica, the more preferably 0.5 μm or more and 2 μm or less.

The added cellulose resin is preferably added in an amount of 7 to 15 parts by mass with respect to 100 parts by mass of the main component.
Examples of the cellulose resin include cellulose resins having an ester group and cellulose acetate. Cellulose may be natural or artificial.
The added curing agent is preferably added in an amount of 2 to 5 parts by mass with respect to 100 parts by mass of the main component.

<Substrate 6>
The base material 6 is made of, for example, a single plate, plywood, fiberboard, composite material, laminated material, or the like made of cedar, straw, straw, lauan, teak, or the like. In the present embodiment, a medium density fiberboard (MDF) is used as the substrate 6. That is, the base material 6 is an MDF base material. MDF is a type of molded board (fibre board) made of wood fiber, and is obtained by hot-press molding a wooden chip by adding a synthetic resin as an adhesive to a steamed and defibrated wood chip. Compared to particle boards and oriented strand boards (OSB) made of the same wood chip material, the constituent elements (segments) are small, and not only the surface but also the lip portion is smooth. In practice, a particle board or an oriented strand board (OSB) may be used as the substrate 6. Further, as the substrate 6, plastic film, paper, metal, cloth, leather, glass, ceramics, etc. can be used.

<Adhesive layer 5>
The adhesive layer 5 is formed in order to bond the base material 6 and the decorative sheet 1 together. The adhesive layer 5 can be formed, for example, by drying and curing the adhesive.
It does not specifically limit about an adhesive agent, A well-known adhesive agent in the field | area of the decorative sheet 1 can be used. Examples of the adhesive known in the field of the decorative sheet 1 include thermoplastic resins such as polyamide resin, acrylic resin and vinyl acetate resin, and curable resins such as thermosetting urethane resin. Further, a two-component curable polyurethane resin or polyester resin using isocyanate as a curing agent can also be applied.

  Conventionally, as the adhesive layer 5, an aqueous adhesive, particularly an emulsion adhesive has been used. For example, urethane-modified ethylene-vinyl acetate polymer was used as the main agent, and aliphatic isocyanate was used as the curing agent. Water-based adhesives are relatively safe because there is little risk of ignition or toxicity. The emulsion adhesive is an adhesive in which a synthetic resin polymer is uniformly dispersed in water. The emulsion adhesive can be expected to have a throwing effect that penetrates into the gaps of the adherend and cures like a wedge.

  Conditions such as drying temperature and drying time of the water-based adhesive are not particularly limited, and may be appropriately set according to the type of the adhesive. The method of applying the adhesive is not particularly limited, and examples thereof include roll coating, curtain flow coating, wire bar coating, reverse coating, gravure coating, gravure reverse coating, air knife coating, kiss coating, blade coating, smooth coating, and comma coating. The method can be adopted.

  At present, a PUR (Poly Ureethane Reactive) type hot melt adhesive such as a one-component moisture curable urethane hot melt adhesive is newly used as the adhesive layer 5. A hot-melt adhesive is a thermoplastic adhesive that is solid at normal temperature but is applied to an adherend in a liquefied state by heating and melting at about 80 ° C. to 100 ° C., and forms a bond by cooling and solidification. . Curing is fast and no gas is generated because no solvent is used. Among them, the PUR hot melt adhesive is mainly composed of a polyurethane-based uncured resin (prepolymer), and is cured by heating and reacting with moisture (humidity) in the air. Once the reaction is complete, a tough film is formed and exhibits strong adhesion. Since the PUR hot melt adhesive after the reaction is not dissolved again by heat, it is excellent in heat resistance and cold resistance. Moreover, since it has a tough film and strong adhesion performance, the amount of coating can be considerably reduced. As a PUR type hot melt adhesive, for example, “Tyforce FH315” manufactured by DIC Corporation is known. These adhesives may be used.

<Effects and others>
In this embodiment, the primer layer 4 is composed mainly of a mixture of polyester polyol and vinyl acetate resin, and silica and cellulose resin having an average particle size of 3 μm or less are added to the main component.
According to this configuration, the vinyl chloride-vinyl acetate copolymer resin is mixed with the polyester polyol, and the silica and the cellulose resin having an average particle size of 3 μm or less are added to thereby make the manufacturer of the decorative sheet 1 and the decorative sheet 1 thereof. It is possible to provide a decorative board having a stable adhesive strength regardless of whether the decorative board used is different, regardless of whether an adhesive is a water-based adhesive or a PUR hot melt adhesive. Become.

At this time, the mixing ratio of the polyester polyol and the vinyl acetate resin is preferably in the range of 90:10 to 70:30 in terms of mass ratio.
Moreover, it is preferable that a silica is the addition amount of 0.8 to 4 mass parts with respect to 100 mass parts of main components.
Moreover, it is preferable that a cellulose resin is the addition amount of 7 to 15 mass parts with respect to 100 mass parts of main components.
Moreover, it is preferable that 2 to 5 mass parts of hardening | curing agents are added with respect to 100 mass parts of main components.

Examples of the present invention will be described below.
Table 1 shows configurations of the example and the comparative example.

(Example)
As the base material sheet 2 of the decorative sheet 1, a polypropylene resin raw material having a thickness of 0.07 mm is used. The primer layer 4 is mainly composed of a mixture of polyester polyol and vinyl acetate resin, and 1.5 parts by mass of silica having a particle diameter of 2 μm, 10 parts by mass of cellulose, and curing agent 3 with respect to 100 parts by mass of the main component. Primers containing parts by weight were used. This primer was applied to the back surface of the base material sheet 2 of the decorative sheet 1 at a coating amount of 0.9 g / m ² dry and dried to obtain a primer layer 4.
Here, in the above mixture, the mass ratio of the polyester polyol and the vinyl chloride resin was set to 80:20.
Moreover, as the base material 6, the MDF base material 6 of thickness 3mm was used.

(Comparative example)
As the base material sheet 2 of the decorative sheet 1, a polypropylene resin raw material having a thickness of 0.07 mm is used. As the primer layer 4, a primer liquid containing polyester polyol as a main component and containing 9 parts by mass of silica having a particle diameter of 4 μm and 3 parts by mass of a curing agent with respect to 100 parts by mass of the main component was used. This primer solution was applied to the back surface of the base sheet 2 of the decorative sheet 1 at a coating amount of 1.2 g / m ² dry and dried to form a primer layer 4.
Moreover, as the base material 6, the MDF base material 6 of thickness 3mm was used.

(Performance evaluation 1)
The decorative sheet 1 and the substrate 6 were bonded to each other with two types of adhesives, and a peel test was performed.
That is, as the peel test, the decorative sheet 1 was cut into a width of 25 mm and the peel test was performed.
Specifically, after making the back surface primer of each decorative sheet 1 of the example and the comparative example adhere to the base material 6 through each of the aqueous adhesive and the PUR hot melt adhesive, it is forcibly separated. Then, the material breakage state of the decorative sheet 1 was observed. In addition, the peeling strength of the base material 6 and the decorative sheet 1 is 30 N / 25 mm width.

Here, as the aqueous adhesive, a one-part aqueous adhesive composed of a urethane-modified ethylene-vinyl acetate polymer was applied to the surface of the substrate 6.
Further, as a PUR-based hot melt adhesive, a one-component moisture-curing urethane hot melt adhesive was applied to the surface of the substrate 6 with a thickness of 0.04 mm and an application amount of 40 g / m ² dry.
Table 2 shows the test results.

[Evaluation]
The evaluation is as follows.
○: Pass (base material breakage)
×: Fail (raw fabric interface peeling)

As can be seen from Table 1, in the example, when the material breakage state was observed by forcibly peeling, the base material 6 broke the material against both the aqueous adhesive and the PUR hot melt adhesive. It was confirmed that the adhesive strength between the adhesive layer 5 and the primer layer 4 was sufficient. For this reason, in any Example, even if it used any adhesive agent, it was set as the pass.
On the other hand, in the comparative example, when the material breakage state was observed by forcibly peeling, interfacial peeling occurred on the base material 6 for both the aqueous adhesive and the PUR hot melt adhesive, It was rejected.

(Performance evaluation 2)
As the peel test after the environmental test, the following tests (A) to (D) were performed.
(A) After adhering the back surface primer of the decorative sheet 1 of Examples and Comparative Examples to the substrate 6 with an aqueous adhesive, the material was forcibly peeled to observe the material breakage state. This was the same as the test for the water-based adhesive in Performance Evaluation 1.

(B) Next, the back primer of the decorative sheet 1 of Examples and Comparative Examples was adhered to the substrate 6 with a water-based adhesive, left in a 60 ° C. atmosphere for 2000 hours, and then forcibly separated to break the material. The state was observed.
(C) Next, the back primer of the decorative sheet 1 of Examples and Comparative Examples was adhered to the substrate 6 with a water-based adhesive, left in an atmosphere of 80 ° C. for 2000 hours, and then forcibly separated to break the material. The state was observed.

(D) Next, the back primer of the decorative sheet 1 of Examples and Comparative Examples was adhered to the substrate 6 with a water-based adhesive, left in a 100 ° C. atmosphere for 2000 hours, and then forcibly separated to break the material. The state was observed.
Here, as the aqueous adhesive, a one-part aqueous adhesive composed of a urethane-modified ethylene-vinyl acetate polymer was applied to the surface of the substrate 6.
Table 3 shows the test results.

[Evaluation]
The evaluation is as follows.
○: Pass (base material breakage)
Δ: Passed (base material breakage, but part of the original fabric interface peeled)
×: Fail (raw fabric interface peeling)

For the examples, from the results of the above tests (A) to (D), it was confirmed that the base material 6 broke down and the adhesive strength between the adhesive layer 5 and the primer layer 4 was sufficient. Passed.
About the comparative example, about the result of said (B) test, the base material 6 broke the material fundamentally, and interface peeling generate | occur | produced in the polypropylene resin raw material which is the base material 6 of the decorative sheet 1 in part. However, since there was no problem in practical use, it was determined to be acceptable “Δ”.
However, in the comparative example, in each of the above tests (A), (C), and (D), interfacial peeling occurred on the base material 6 and thus failed.

(Performance evaluation 3)
As the peel test after the environmental test, the following tests (I) and (II) were performed.
(I) The back surface primer of the decorative sheet 1 of Examples and Comparative Examples was adhered to the substrate 6 with a water-based adhesive, and a cycle of −20 ° C. atmosphere (2 hours) and 60 ° C. atmosphere (2 hours) Then, after carrying out a cold heat repeated test of 80 cycles, the material was peeled forcibly and the state of material breakage was observed.

(II) The back surface primer of the decorative sheet 1 of Examples and Comparative Examples is adhered to the base material 6 with an aqueous adhesive, the decorative board is cut into a width of 25 mm under an atmosphere of 60 ° C., and one end portion is peeled off from the base material 6. Then, the decorative sheet 1 at the tip is peeled off, a weight of 500 g is applied, and the peeled decorative sheet 1 is left for 1 hour in a state where it is pulled by applying a load of 500 g in the 90 ° direction. The peeling length (peeling distance) was measured.
Table 4 shows the test results.

[Evaluation]
○: Pass (base material breakage)
×: Fail (raw fabric interface peeling)

In any of the decorative sheets 1 of Examples and Comparative Examples, as a result of the (I) cold repetition test, the base material 6 breaks down and the adhesive strength between the adhesive layer 5 and the primer layer 4 is sufficient. As a result, it was accepted.
Here, in Example 3, as a result of the heat-resistant creep test (II), a strain of 1.0 mm was measured. In the comparative example, a strain of 1.0 mm was measured as a result of the heat resistance creep test (II).

(result)
As described above, it is found that the examples based on the present invention have better adhesive strength and environmental resistance for both the water-based adhesive and the PUR hot melt adhesive as compared with the comparative example. It was.
Here, in the Examples, the mass ratio of the polyester polyol and the vinyl acetate resin was set to 80:20. It has been confirmed that even if the mass ratio is changed to 90:10 and 70:30, the same effect as in the above-described embodiment is obtained.

Moreover, about the Example, although 1.5 mass parts of silica with a particle size of 2 micrometers is added, it changes to this and it is the same as an Example even if it changes to addition of addition of 1.5 mass parts of silica with a particle diameter of 3 micrometers It has been confirmed that the effect of. Moreover, even if it changed the addition amount of the silica with a particle size of 2 micrometers in an Example into 0.8 mass part and 4 mass parts, it confirmed that the same effect as said Example was acquired.
Moreover, in the Example, even if it changed the addition amount of the cellulose resin into 7 mass parts and 15 mass parts, it has confirmed that the same effect as said Example was acquired.
Moreover, in the Example, even if it changed the addition amount of the hardening | curing agent to 2 mass parts or 5 mass parts, it has confirmed that the same effect as said Example was acquired.

DESCRIPTION OF SYMBOLS 1 Makeup sheet 2 Base material sheet 3 Makeup layer 4 Primer layer 5 Adhesive layer 6 Base material

Claims (6)

A decorative sheet having a primer layer on the back surface of the base sheet,
The primer layer is composed mainly of a mixture of polyester polyol and vinyl chloride-vinyl acetate copolymer resin, and silica and cellulose resin having an average particle size of 3 μm or less are added to the main component. Characteristic decorative sheet.   2. The decorative sheet according to claim 1, wherein a mixing ratio of the polyester polyol and the vinyl chloride-vinyl acetate copolymer resin is in a range of 90:10 to 70:30 in terms of mass ratio.   The decorative sheet according to claim 1 or 2, wherein the silica is added in an amount of 0.8 parts by mass to 4 parts by mass with respect to 100 parts by mass of the main component.   The said cellulose resin is the addition amount of 7 to 15 mass parts with respect to 100 mass parts of main components, The decorative sheet of any one of Claims 1-3 characterized by the above-mentioned.   Furthermore, 2 to 5 mass parts of hardening | curing agents are added with respect to 100 mass parts of main components, The decorative sheet of any one of Claims 1-4 characterized by the above-mentioned. A decorative sheet is formed by bonding a decorative sheet to a base material via an adhesive layer made of a water-based adhesive or a polyurethane-based hot melt adhesive,
The decorative sheet according to any one of claims 1 to 5, wherein the decorative sheet is the decorative sheet according to any one of claims 1 to 5.

Images