JP6511949B2 - Decorative sheet and decorative board - Google Patents

Description

  The present invention relates to a decorative sheet and a decorative board that can be used for interior materials, furniture, and the like.

  At present, Patent Document 1 discloses a polyolefin-based decorative sheet. On the back surface (adhesive surface) of this polyolefin-based decorative sheet, a polyurethane-based backcoat layer as a back surface primer is formed, and this polyurethane-based backcoat layer is an acrylic resin or the like coated on the surface of a wood substrate By bonding with a vinyl acetate resin aqueous adhesive, the polyolefin decorative sheet and the wood substrate can be firmly bonded.

Patent No. 3147735 gazette

  However, at present, due to the customer's convenience (product development, technical trend), etc., the adhesive for the decorative sheet is not limited to the aqueous adhesive of acrylic resin or vinyl acetate resin, but one-component moisture curing urethane hot melt PUR (Poly Urethane Reactive) -based hot melt adhesives such as adhesives are beginning to be used. Therefore, it is required to develop a back surface primer that can be used for any adhesive, in order to correspond to both of the conventionally used water-based adhesive and the PUR hot melt adhesive which is newly used. ing.

  The present invention has been made in view of the above-mentioned circumstances, and provides a decorative sheet and a decorative board using a back surface primer which can be used for any adhesive containing an aqueous adhesive and a PUR hot melt adhesive. The purpose is

  In order to solve said subject, the decorative sheet which concerns on 1 aspect of this invention is stuck on the surface of the base material in which the adhesive bond layer which consists of either an aqueous adhesive and a polyurethane (PUR) type | system | group hot-melt adhesive was provided. In the decorative sheet to be combined, a primer layer made of either an acrylic urethane resin or a polycarbonate resin is provided on the back surface of the polyolefin sheet to be the adhesive surface.

  According to one aspect of the present invention, when laminating the decorative sheet to the substrate, the use of a back surface primer that can be used for any adhesive, including aqueous adhesives and PUR-based hot melt adhesives, Advantageously, stable adhesive strength can be maintained whether an aqueous or PUR-based hot melt adhesive is used.

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

Embodiment
Hereinafter, an embodiment of the present invention will be described with reference to the attached drawings. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimension, the ratio of the thickness of each layer, and the like are different from actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description.
In addition, the embodiments described below illustrate apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention includes materials, shapes, structures, and arrangements of component parts. Etc. are not specified in the following. 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, in the decorative board according to the embodiment of the present invention, the adhesive layer 2, the primer layer (adhesion layer) 3 and the decorative sheet 4 are formed in this order on the surface of the substrate 1. It is formed. That is, the decorative board which concerns on this embodiment laminates the decorative sheet 4 on the surface of the base material 1 through an adhesive agent and a primer (primer). For example, an adhesive is applied to the surface of the substrate 1 to form the adhesive layer 2, a primer is applied to the back surface (adhesion surface) of the decorative sheet 4 to form the primer layer 3, and the adhesive layer 2 and the primer layer 3 And the back surface of the substrate 1 and the back surface of the decorative sheet 4 are bonded.

(Base 1)
The base material 1 is, for example, a veneer made of cedar, rattan, rattan, rawan, teak or the like, plywood, fiber board, composite material, laminated wood, or the like. In the present embodiment, a medium density fiber board (MDF) is used as the substrate 1. That is, the substrate 1 is an MDF substrate. The MDF is a type of molded board (fiber board) made of wood fiber as a raw material, and a wood chip is steamed and fibrillated, and a synthetic resin as an adhesive agent is added to the wood chip to form a plate. Compared with particle board and oriented strand board (OSB) which use the same wood chip material as a raw material, the component (segment) is small and not only the surface but also the end of the wood is smooth. In practice, a particle board or an oriented strand board (OSB) may be used as the substrate 1. Moreover, as the base material 1, a plastic film, paper, metal, cloth, leather, glass, ceramic, etc. can be used.

(Adhesive layer 2)
An adhesive layer 2 is formed on the substrate 1. The adhesive layer 2 is formed to bond the base 1 and the decorative sheet 4 together. The adhesive layer 2 can be formed, for example, by drying and curing the adhesive.

  The adhesive is not particularly limited, and an adhesive known in the field of decorative sheets can be used. Examples of known adhesives in the field of decorative sheets include thermoplastic resins such as polyamide resins, acrylic resins and vinyl acetate resins, and curable resins such as thermosetting urethane resins. In addition, a two-part curable polyurethane resin or polyester resin having an isocyanate as a curing agent can also be applied.

  Conventionally, an aqueous adhesive, in particular an emulsion adhesive, has been used as the adhesive layer 2. 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. Water-based adhesives are relatively safe because they do not pose a risk of fire or toxicity. An emulsion adhesive is an adhesive in which a polymer of a synthetic resin is uniformly dispersed in water. The emulsion adhesive penetrates into the gap of the adherend and can be expected to have an anchoring effect of curing like a wrinkle.

  The conditions such as the drying temperature and the drying time of the aqueous adhesive are not particularly limited, and may be appropriately set according to the type of the adhesive. The application method of the adhesive is not particularly limited. For example, roll coat, curtain flow coat, wire bar coat, reverse coat, gravure coat, gravure reverse coat, air knife coat, kiss coat, blade coat, smooth coat, comma coat, etc. The method can be adopted.

  At present, a PUR (Poly Urethane Reactive) -based hot melt adhesive such as a one-component moisture-curable urethane hot melt adhesive is newly used as the adhesive layer 2. A hot melt adhesive is a thermoplastic adhesive which 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. . It cures quickly and no gas is generated because it does not use a solvent. Among them, PUR-based hot melt adhesives contain polyurethane-based uncured resin (prepolymer) as a main component, and after heat dissolution, react with moisture in the air (moisture) to be cured. Once the reaction is completed, a strong film is formed to exert strong adhesion. The PUR-based hot melt adhesive after the reaction is not melted again by heat, so it is also excellent in heat resistance and cold resistance. In addition, since it has a strong film and a strong adhesive performance, it is possible to considerably reduce the coating amount. As PUR-based hot melt adhesives, for example, "Tyforce FH 315" manufactured by DIC Corporation is known.

(Primer layer 3)
A primer layer 3 is formed between the adhesive layer 2 and the decorative sheet 4. The primer layer 3 can be formed by applying a primer (primer) to the decorative sheet 4. In addition, the primer apply | coated to the back surface (adhesive surface) of the decorative sheet 4 is called back surface primer. The primer is a low viscosity liquid with low non-volatile content applied to improve the adhesion of the surface of the adherend. When an adhesive is applied on the primer layer 3, the adhesive is applied when the primer is sufficiently dry. The type of primer varies depending on the type of adherend and adhesive. As the primer, for example, a urethane resin primer consisting of an acryl modified urethane resin (for example, a block copolymer of acryl and urethane) or the like, and a urethane-cellulose resin (for example, a mixture of urethane and nitrification cotton) with hexamethylene diisocyanate added And the like.

  The primer layer 3 which concerns on this embodiment uses the primer which consists of either an acryl urethane type resin and a polycarbonate-type resin. The primer layer 3 according to the present embodiment can be used for any adhesive regardless of whether the adhesive layer 2 is water-based adhesive or PUR-based hot melt adhesive.

(Cosmetic sheet 4)
The decorative sheet 4 is a sheet-like decorative material for providing the base 1 with a design. As the decorative sheet 4, it is possible to optionally use a decorative sheet generally used in circulation. In addition, various materials usable as the decorative sheet can be used as long as there is no inhibiting factor.
In the present embodiment, a polyolefin-based decorative sheet is used as the decorative sheet 4. 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 it is burned, it becomes water (H2O) and carbon dioxide (CO2) etc. Resin.
Although not shown, the decorative sheet 4 is formed, for example, by laminating a print layer, a picture layer, and a resin layer in this order on the surface side of a film that is a base material of the sheet. Moreover, a primer is coated on the back surface side of the film used as the base material of a sheet, and the primer layer 3 is formed. However, in practice, as the decorative sheet 4, a single-colored decorative material or the like having no pattern layer can be appropriately selected.
The film serving as the base material of the sheet is a film formed of polyester or the like by a calendar method, an inflation method, a T-die extrusion method or the like. Examples of the polyester include polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN) and the like. Moreover, paper base materials, such as oil-resistant paper which has oil resistance, can also be used as a base material of a sheet | seat.
The print layer is provided for the purpose of enhancing the design of the decorative material, and is also referred to as a masking layer or an all-solid layer giving the intended color to the surface of the film, and uniformly covers the entire surface of the film. It is a uniform member. The printed layer is usually formed in an opaque color in many cases, but may be formed in a colored and transparent manner, and may take advantage of the pattern possessed by the substrate. Moreover, when taking advantage of the fact that the film is white, it may be colorless and transparent.
The design layer is for imparting a design with a desired design on the surface side of the print layer, and the type of design etc. is not particularly limited. For example, grain patterns, grain patterns, grain patterns, tile patterns, brick pile patterns, grain patterns, skin patterns, geometric figures, characters, symbols, abstract patterns and the like can be mentioned.
The resin layer is also referred to as a surface protection layer or a coating layer (coating layer) for protecting the surface of the printing layer or the pattern layer, and a uniform uniform member covering the entire surface of the printing layer or the pattern layer. It is. Although the resin layer is not limited, it is preferable to contain an ionizing radiation curable resin or a two-component curable urethane resin as a resin component. Substantially, those formed of these resins are preferred. When the resin layer is formed of the ionizing radiation curable resin or the two-component curable urethane resin, the abrasion resistance, impact resistance, contamination resistance, scratch resistance, weather resistance and the like of the cosmetic material can be easily improved.

(Effect of this embodiment)
According to the present embodiment, the following effects can be obtained.
(1) The decorative sheet according to the present embodiment is a decorative sheet to be bonded to the surface of a substrate provided with an adhesive layer comprising either an aqueous adhesive or a polyurethane (PUR) hot melt adhesive. The primer layer which consists of either an acryl urethane type resin and a polycarbonate-type resin is provided in the back surface of the polyolefin type sheet used as this.
Thus, when using the back surface primer which can be used for any adhesive agent including an aqueous adhesive and a PUR-based hot melt adhesive when laminating the decorative sheet to the substrate, the aqueous adhesion is made by the convenience of the customer side. Even when either an agent or a PUR-based hot melt adhesive is used, stable adhesive strength can be maintained.

(2) In the decorative board according to the present embodiment, the adhesive layer, the primer layer, and the decorative sheet are formed in this order on the base material. The adhesive layer is formed of either an aqueous adhesive or a polyurethane (PUR) based hot melt adhesive. The primer layer is formed of either an acrylic urethane resin or a polycarbonate resin. The decorative sheet is a polyolefin-based sheet.
Thus, when using the back surface primer which can be used for any adhesive agent including an aqueous adhesive and a PUR-based hot melt adhesive when laminating the decorative sheet to the substrate, the aqueous adhesion is made by the convenience of the customer side. Even when either an agent or a PUR-based hot melt adhesive is used, stable adhesive strength can be maintained.

<Other embodiments>
Although the present invention has been described by the above embodiments, it should not be understood that the description and the drawings, which form a part of this disclosure, limit the present invention. Various alternative embodiments, examples and operation techniques will be apparent to those skilled in the art from this disclosure. That is, in practice, the present invention is not limited to the above-described embodiment, and changes in the scope without departing from the scope of the present invention are included in the present invention.

Hereinafter, Examples 1 to 3 of the present invention and comparative examples thereof will be described. Table 1 shows the details of Examples 1 to 3 of the present invention and their comparative examples.

Example 1
As the substrate 1, an MDF substrate having a thickness of 3 mm is used. As a film used as a base material of decorative sheet 4, a polypropylene resin original fabric with a thickness of 0.07 mm is used. As a primer layer 3, 3.8 mass% of silica having a particle diameter of 2 μm was added, and an acrylic urethane resin having a glass transition point of 102 ° C. containing 10 parts by mass of a curing agent with respect to 100 parts by mass of a main agent was coated 1 It coated on the back surface of the film used as the base material of the decorative sheet 4 by 3 g / m < ² > dry.

(Example 2)
As the substrate 1, an MDF substrate having a thickness of 3 mm is used. As a film used as a base material of decorative sheet 4, a polypropylene resin original fabric with a thickness of 0.07 mm is used. As the primer layer 3, a polycarbonate urethane resin containing 4 parts by mass of a curing agent with respect to 100 parts by mass of the main agent is applied to the back surface of a film to be a substrate of the decorative sheet 4 at an application amount of 0.9 g / m ² dry. did.

(Example 3)
As the substrate 1, an MDF substrate having a thickness of 3 mm is used. As a film used as a base material of decorative sheet 4, a polypropylene resin original fabric with a thickness of 0.07 mm is used. A polyester urethane-based and vinyl chloride-vinyl acetate copolymer-based system containing 1.5 parts by mass of silica having a particle diameter of 2 μm as the primer layer 3 and containing 3 parts by mass of a curing agent with respect to 100 parts by mass of the main agent System) The resin was applied to the back surface of the film serving as the base of the decorative sheet 4 at a coating amount of 0.9 g / m ² dry.

(Comparative example)
As the substrate 1, an MDF substrate having a thickness of 3 mm is used. As a film used as a base material of decorative sheet 4, a polypropylene resin original fabric with a thickness of 0.07 mm is used. As a primer layer 3, 9 mass% of silica having a particle diameter of 4 μm is added, and a polyester urethane resin containing 3 parts by mass of a curing agent based on 100 parts by mass of a main agent is coated at a coating amount of 1.2 g / m ² dry It coated on the back of the film used as the base material of 4.

［評価］
○：合格（基材材破）
△：合格（基材材破だが一部原反界面剥離）
×：不合格（原反界面剥離） (Performance evaluation 1)
As a peeling test, the decorative sheet 4 was incised at a width of 25 mm and subjected to the peeling test. Specifically, after the back surface primers of Examples 1 to 3 of the present invention and its comparative example are adhered to each of the water-based adhesive and the PUR-based hot melt adhesive, they are forcibly peeled to break the material. Observed. In addition, the peeling strength of the base material 1 and the decorative sheet 4 is 30 N / 25 mm width.
Here, a one-component aqueous adhesive composed of a urethane-modified ethylene-vinyl acetate polymer was applied to the surface of the substrate 1 as an aqueous adhesive.
In addition, as a PUR-based hot melt adhesive, a one-component moisture-curable urethane hot melt adhesive was applied to the surface of the substrate 1 with a thickness of 0.04 mm and a coating amount of 40 g / m ² dry.
Table 2 shows the test results.

[Evaluation]
○: Pass (base material breakage)
合格: Passed (base material broken but part of the original interface peeled off)
X: Fail (raw surface peeling)

In Example 1 and Example 2, when the material peeling state is observed by forced peeling, the base material 1 is broken for both the water-based adhesive and the PUR hot-melt adhesive, Since the adhesive strength between the adhesive layer 2 and the primer layer 3 was confirmed to be sufficient, it was regarded as a pass.
In Example 3, when the material peeling state was observed by forced peeling, the base material 1 was broken for both the water-based adhesive and the PUR hot melt adhesive, and the adhesive layer 2 was obtained. Since the adhesive strength with and the primer layer 3 was confirmed to be sufficient, it was considered as a pass.
In the case of the comparative example, when the material breakage state was observed by forcibly peeling, since interfacial peeling was generated in the base material 1 for both the water-based adhesive and the PUR hot-melt adhesive, the rejection and did.

［評価］
○：合格（基材材破）
△：合格（基材材破だが一部原反界面剥離）
×：不合格（原反界面剥離） (Performance evaluation 2)
The following tests (A) to (E) were conducted as peeling tests after the environmental test.
(A) After the back surface primers of Examples 1 to 3 of the present invention and its comparative example were adhered to an aqueous adhesive, they were forcibly peeled to observe a scraped state. This is similar to the test for water-based adhesive in Performance Evaluation 1.
(B) The back surface primer of each of Examples 1 to 3 of the present invention and its comparative example was adhered to an aqueous adhesive and left for 2000 hours in a 40 ° C. atmosphere, and then forcibly peeled to observe a broken state .
(C) The back surface primer of each of Examples 1 to 3 of the present invention and its comparative example was adhered to an aqueous adhesive, and left for 2000 hours under an atmosphere of 60 ° C. .
(D) The back surface primer of each of Examples 1 to 3 of the present invention and its comparative example was adhered to an aqueous adhesive, left in an atmosphere at 80 ° C. for 2000 hours, and then forcibly peeled to observe a broken state. .
(E) The back surface primer of each of Examples 1 to 3 of the present invention and its Comparative Example was adhered to an aqueous adhesive, and left for 2000 hours under an atmosphere of 100 ° C. .
Here, a one-component aqueous adhesive composed of a urethane-modified ethylene-vinyl acetate polymer was applied to the surface of the substrate 1 as an aqueous adhesive.
Table 3 shows the test results.

[Evaluation]
○: Pass (base material breakage)
合格: Passed (base material broken but part of the original interface peeled off)
X: Fail (raw surface peeling)

About Example 1, as a result of all the tests of the above (A) to (E), it can be confirmed that the substrate 1 is broken and the adhesive strength between the adhesive layer 2 and the primer layer 3 is sufficient. And I passed the exam.
In Example 2, as a result of all the tests (A) to (E) described above, it is possible to confirm that the base material 1 is broken and the adhesive strength between the adhesive layer 2 and the primer layer 3 is sufficient. And I passed the exam.
In Example 3, as a result of all the tests (A) to (E) described above, it can be confirmed that the substrate 1 was broken and the adhesive strength between the adhesive layer 2 and the primer layer 3 was sufficient. And I passed the exam.
In the comparative example, the base material 1 was broken as a result of the test of (B) above, and it was confirmed that the adhesive strength between the adhesive layer 2 and the primer layer 3 was sufficient. Moreover, in the above test (C), the base material 1 basically broke, and interfacial peeling occurred in part of the polypropylene resin raw fabric which is the base material of the decorative sheet 4, but it is a problem in practical use Because I did not pass it. However, since the interfacial peeling occurred in the substrate 1 as a result of each of the tests (A), (D) and (E) described above, it was rejected.

［評価］
○：合格（基材材破） (Performance evaluation 3)
The following tests (I) and (II) were conducted as peeling tests after the environmental test.
(I) The back surface primer of Examples 1 to 3 of the present invention and its comparative example is adhered to an aqueous adhesive, and one cycle is performed under an atmosphere of -20 ° C (2 hours) and under a 60 ° C atmosphere (2 hours). After the 80 cycles of the thermal cycle test were conducted, the material was forcibly exfoliated and the broken state was observed.
(II) The back surface primer of Examples 1 to 3 of the present invention and its comparative example is adhered to an aqueous adhesive, the decorative board is cut to a width of 25 mm under an atmosphere of 60 ° C., and one end is peeled off from the substrate 1; The decorative sheet 4 at the leading end is peeled off, a 500 g weight is placed thereon, and the peeled decorative sheet 4 is left in a stretched state with a load of 500 g in the 90 ° direction for 1 hour. The peeling length (peeling distance) of
Table 4 shows the test results.

[Evaluation]
○: Pass (base material breakage)

In any of Examples 1 to 3 of the present invention and its comparative example, as a result of the above-mentioned cold heat repeated test of (I), the base material 1 is broken and the adhesive strength between the adhesive layer 2 and the primer layer 3 is It was accepted because it was confirmed that it was sufficient.
About Example 1 of this invention, the distortion of 1.1 mm was measured as a result of the above-mentioned heat-resistant creep test of (II).
About Example 2 of this invention, the distortion of 2.3 mm was measured as a result of the above-mentioned heat-resistant creep test of (II).
About Example 3 of this invention, the distortion of 3.5 mm was measured as a result of the above-mentioned heat-resistant creep test of (II).
About the comparative example of this invention, the distortion of 4.8 mm was measured as a result of the above-mentioned heat-resistant creep test of (II).

(result)
Thus, Examples 1 to 3 of the present invention have better adhesive strength and environmental resistance to both the water-based adhesive and the PUR hot-melt adhesive as compared to the comparative example.

1 substrate 2 adhesive layer 3 primer layer (adhesive layer)
4 makeup sheet

Claims (10)

In the decorative sheet adhesive layer made of either an aqueous adhesive and a polyurethane-based hot melt adhesive bonded to the surface of the provided substrate, the primer layer is provided on the back surface of the polyolefin sheet comprising an adhesive surface Yes,
The primer layer is formed of a polyester urethane-based and vinyl chloride-vinyl acetate copolymer-based resin containing 1.5 parts by mass of silica having a particle diameter of 2 μm and containing 3 parts by mass of a curing agent with respect to 100 parts by mass of a main agent. decorative sheet, characterized in that is. The adhesive layer comprises the aqueous adhesive.
The decorative sheet according to claim 1, wherein the aqueous adhesive contains a urethane-modified ethylene-vinyl acetate polymer. Primers in decorative sheet bonded to the surface of the water-based adhesives or Ranaru adhesive layer is provided substrate, the back surface of the polyolefin sheet comprising an adhesive surface, consisting of either acrylic urethane resin and a polycarbonate urethane resin Layers are provided ,
The decorative sheet characterized in that the aqueous adhesive contains a urethane-modified ethylene-vinyl acetate polymer . The cosmetic according to claim 3 , wherein the primer layer is formed of an acrylic urethane resin added with 3.8% by mass of silica having a particle diameter of 2 μm and containing 10 parts by mass of a curing agent with respect to 100 parts by mass of a main agent. Sheet. The decorative sheet according to claim 3 , wherein the primer layer is formed of a polycarbonate urethane resin containing 4 parts by mass of a curing agent with respect to 100 parts by mass of a main agent. An adhesive layer, a primer layer and a decorative sheet are formed in this order on the substrate,
The adhesive layer is formed of either an aqueous adhesive or a polyurethane-based hot melt adhesive.
The primer layer is formed of a polyester urethane-based and vinyl chloride-vinyl acetate copolymer-based resin containing 1.5 parts by mass of silica having a particle diameter of 2 μm and containing 3 parts by mass of a curing agent with respect to 100 parts by mass of a main agent. ,
The decorative sheet is a polyolefin sheet. The adhesive layer is formed by the aqueous adhesive.
The decorative board according to claim 6, wherein the aqueous adhesive contains a urethane-modified ethylene-vinyl acetate polymer. An adhesive layer, a primer layer and a decorative sheet are formed in this order on the substrate,
The adhesive layer is formed of a urethane-modified ethylene-vinyl acetate polymer ,
The primer layer is formed of either an acrylic urethane resin or a polycarbonate urethane resin.
The decorative sheet is a polyolefin sheet. 9. The cosmetic according to claim 8 , wherein the primer layer is formed of an acrylic urethane resin added with 3.8% by mass of silica having a particle diameter of 2 μm and containing 10 parts by mass of a curing agent with respect to 100 parts by mass of a main agent. Board. The decorative board according to claim 8 , wherein the primer layer is formed of a polycarbonate urethane resin containing 4 parts by mass of a curing agent with respect to 100 parts by mass of a main agent.

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