JP2015127127A - Melamine decorative material, and method for manufacturing melamine decorative material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a melamine decorative material which can clearly express a decorative pattern, can make fingerprints inconspicuous, and has excellent durability, and to provide a method for producing the melamine decorative material which enables easy production of such a melamine decorative material.SOLUTION: There is provided a melamine decorative material 100, having on its surface a first region 111 composed of a melamine resin X and a second region 112 composed of a low refractive-index material Y having a lower refractive index than that of the melamine resin. Further, the melamine decorative material 100 includes a first layer 110 containing the melamine resin X and the low refractive index material Y, and a second layer 120 containing the melamine resin X and does not contain the low refractive-index material.

Description

  The present invention relates to a melamine decorative material and a method for producing a melamine decorative material.

  Melamine decorative material is a decorative material that uses melamine resin for the surface layer. From the characteristics of melamine resin, it has high surface hardness, abrasion resistance, heat resistance, hot water resistance, contamination resistance, boiling resistance, light resistance, etc. Excellent durability. On the other hand, since the melamine resin has a high refractive index, there is a problem that the cosmetic pattern cannot be clearly expressed and fingerprints are easily noticeable as compared with a cosmetic material made of a resin having a lower refractive index than the melamine resin.

  In order to solve such a problem, a cosmetic material in which a layer made of a material having a lower refractive index than that of the melamine resin is provided on the melamine resin layer has been proposed (for example, see Patent Document 1). . In this way, by providing a layer made of a material having a low refractive index on the melamine resin layer, the cosmetic pattern can be clearly expressed and the fingerprint can be made inconspicuous.

  However, when a layer made of a material having a low refractive index is provided on the melamine resin layer, the melamine resin is not exposed on the surface, so that the above-mentioned characteristics of the melamine resin cannot be obtained. It was.

JP 2009-233878 A

  An object of the present invention is to provide a melamine cosmetic material capable of clearly expressing a decorative pattern, making fingerprints and the like inconspicuous and having excellent durability, and capable of easily producing such a melamine cosmetic material. It is in providing the manufacturing method of a cosmetic material.

Such an object is achieved by the present inventions (1) to (6) below.
(1) On the surface, the 1st area | region comprised with the melamine resin,
And a second region composed of a low refractive index material having a lower refractive index than that of the melamine resin.

  (2) The melamine decorative material according to (1), wherein the ratio of the area occupied by the first region on the surface when viewed in plan is 5% or more and 80% or less.

(3) a first layer containing the melamine resin and the low refractive index material;
The melamine decorative material according to (1) or (2), further including a second layer that includes the melamine resin and does not include the low refractive index material.

  (4) The melamine decorative material according to (3), wherein the thickness of the first layer is 0.01 μm or more and 100 μm or less.

  (5) The melamine decorative material according to any one of (1) to (4), wherein a refractive index of the low refractive index material is less than 1.50.

(6) The method for producing a melamine decorative material according to any one of (1) to (5) above,
Forming a melamine resin layer containing the melamine resin;
Providing a composition containing the low refractive index material on the melamine resin layer, and forming a low refractive index material layer containing the low refractive index material;
While heating the melamine resin layer and the low refractive index material layer, pressurize toward the inner side of each layer, and the second layer composed of the melamine resin, and the melamine resin and the low refractive index material And a step of forming the formed first layer. A method for producing a melamine decorative material, comprising:

  ADVANTAGE OF THE INVENTION According to this invention, a decorative pattern can be expressed clearly, a fingerprint etc. are not conspicuous, and the melamine cosmetic material excellent in durability can be provided.

  Moreover, the manufacturing method of the melamine decorative material which can manufacture such a melamine decorative material easily can be provided.

It is sectional drawing which shows suitable embodiment of the melamine decorative material of this invention. It is process drawing which showed an example of the manufacturing method of the melamine decorative material of this invention.

Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
《Melamine cosmetics》
First, a preferred embodiment of the melamine decorative material of the present invention will be described.

  The melamine decorative material of the present invention can give aesthetics and a high-class feeling by being attached to a building wall, interiors such as elevators and train cars, furniture such as desks and bookshelves.

FIG. 1 is a cross-sectional view showing an embodiment of the melamine decorative material of the present invention.
As shown in FIG. 1, the melamine decorative material 100 is composed of a laminate in which a surface layer 11 and a base material layer 12 are laminated.

Hereinafter, each layer will be described in detail.
<1. Surface layer>
The surface layer 11 is a layer that contributes to design and aesthetics, and is obtained by impregnating a surface layer base material such as decorative paper with a resin such as a melamine resin and drying it.

  As shown in FIG. 1, the surface layer 11 includes a melamine resin X, a first layer 110 including a low refractive index material Y having a refractive index lower than that of the melamine resin X, a melamine resin, and a low refractive index. A second layer 120 containing no material.

  As shown in FIG. 1, the first layer 110 has a first region 111 made of melamine resin X and a second region 112 made of low refractive index material Y on the surface (design surface). ,have.

  Thus, the melamine decorative material of the present invention has a first region composed of melamine resin on the surface and a second region composed of a low refractive index material having a refractive index lower than that of the melamine resin. It has a feature in that.

  By the way, since the melamine resin has a relatively high refractive index of 1.6 to 1.7, reflected light on the surface of the decorative material increases. As a result, incident light to the interior of the decorative material is reduced, and reflected light from the decorative pattern (color information perceived by humans) is reduced, which causes a problem that the decorative pattern cannot be expressed clearly. In addition, the refractive index of the oil / fat component, which is a cause of fingerprints, is about 1.5, and the reflectance is low. In addition, due to the uneven shape of the attached oil / fat component, the fingerprints and the like are conspicuous.

  On the other hand, the melamine decorative material of the present invention has a second region composed of a low refractive index material, so that the decorative pattern can be clearly expressed. Moreover, even when dirt such as fingerprints adheres, dirt such as fingerprints can be made inconspicuous. Furthermore, since the surface of the melamine decorative material has a portion where the melamine resin is exposed (first region), the melamine decorative material has high surface hardness, wear resistance, heat resistance, hot water resistance, and stain resistance. In addition, durability such as boiling resistance and light resistance can be effectively exhibited.

  The ratio of the area occupied by the first region 111 composed of the melamine resin X on the surface of the melamine decorative material 100 when viewed in plan is preferably 5% to 80%, and preferably 5% to 70%. It is more preferable that Thereby, the characteristic of a low refractive index material can be exhibited more effectively, exhibiting the characteristic of a melamine resin.

  The melamine resin X is not particularly limited, and for example, a resin obtained by reacting melamine and formaldehyde in a neutral or weak alkali can be used.

  The reaction molar ratio of formaldehyde to melamine (the value of (molar amount of formaldehyde) / (molar amount of melamine), hereinafter may be simply referred to as “reaction molar ratio”) is not particularly limited. -4.0, preferably 1.0-2.0, more preferably 1.1-1.8, and those obtained by reaction can be suitably used. When the reaction molar ratio is less than the lower limit, unreacted components may increase, resulting in a decrease in storage stability and cost. Moreover, when the said upper limit is exceeded, the resin flexibility fall after hardening may become remarkable. In addition, as a melamine resin, what is contained individually by 1 type can also be used, and what mixed and contained 2 or more types of melamine resins from which a reaction molar ratio, a weight average molecular weight, etc. differ can also be used.

  Moreover, as a melamine resin, commercially available products, such as a melamine resin manufactured by Sumitomo Chemical Co., Ltd., can be used.

  Although the weight average molecular weight of a melamine resin is not specifically limited, It is preferable that it is 200-500, and it is more preferable that it is 250-350. When the molecular weight is smaller than the lower limit, the amount of unreacted components increases, and the storage stability may decrease. Moreover, when larger than the said upper limit, the impregnation property to a base material may fall. The weight average molecular weight can be measured, for example, by GPC (gel permeation chromatography, standard substance: converted to polystyrene).

  The low refractive index material Y is not particularly limited as long as it is a material having a refractive index lower than that of the melamine resin, and includes, for example, a fluorine-containing compound, an acrylic resin, an acrylic urethane resin, a silicon-containing compound, a hollow structure, and a porous surface. Compounds and the like.

Examples of the fluorine-containing compound include polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, perfluoroalkoxy fluororesin, tetrafluoroethylene / hexafluoropropylene copolymer, ethylene / tetrafluoride. Examples thereof include ethylene copolymers, ethylene / chlorotrifluoroethylene copolymers, fluoroethylene / vinyl ether copolymers, fluorine-containing resins such as fluorine urethane resins, and magnesium fluoride (MgF ₂ ).

Examples of the silicon-containing compound include silicone resin and silica (SiO ₂ ).

  In addition, examples of the compound having a hollow structure or a porous surface include hollow silica and porous silica.

  The refractive index of the low refractive index material is preferably less than 1.50, and more preferably from 1.25 to 1.45. Thereby, a makeup pattern can be expressed more clearly. Further, even when fingerprints or the like are adhered, the fingerprints or the like can be more effectively made inconspicuous.

  Note that the first region 111 and the second region 112 are preferably uniformly distributed. That is, when the design surface of the melamine decorative material 100 is visually observed, it is preferable that the mixture of the melamine resin and the low-refractive index material is not visible as appearance unevenness (gloss unevenness or sharpness unevenness). Thereby, a makeup pattern can be expressed more clearly. Further, even when fingerprints or the like are adhered, the fingerprints or the like can be more effectively made inconspicuous. Moreover, durability can be made more excellent.

  The surface layer substrate is a sheet-like substrate having a design surface formed on the first layer 110 side. The material of the surface layer substrate is not particularly limited, and for example, pulp, linter, synthetic fiber, glass fiber, or the like can be used. Further, if necessary, titanium oxide-containing decorative paper containing a pigment such as titanium oxide can be used.

Although the basic weight of a surface layer base material is not specifically limited, It is preferable that it is 40-150 g / m < ² >. When the basis weight is less than the lower limit, coating treatment is difficult due to problems of cutting and wrinkling in the resin impregnation step. On the other hand, when the basis weight exceeds the above upper limit, the impregnation amount of the resin carried by the surface layer base material becomes uneven, which reduces the flexibility of the melamine decorative material 100 and causes a decrease in productivity and cost. There is a case.

  The thickness of the first layer 110 is preferably 0.01 μm or more and 100 μm or less, and more preferably 0.1 μm or more and 50 μm or less. Thereby, the characteristic of a low refractive index material can be exhibited more effectively, exhibiting the characteristic of a melamine resin.

<2. Base material layer>
The base material layer 12 is a layer that supports the surface layer 11, and is bonded to the surface side opposite to the design surface of the surface layer 11.

  Examples of the base material layer 12 include various metal sheets (including metal foils and metal plates), various resin sheets (including resin plates), various cloths, various papers, various wooden boards, plaster boards, and the like, and composites thereof. And laminates.

  As a constituent material of various metal sheets, aluminum, iron, nickel, copper, magnesium, zinc etc. are mentioned, for example, Among these, it can use 1 type or in combination of 2 or more types.

  In addition, the metal sheet may be a sheet-like base material made of a material other than a metal material and the like plated with the metal material.

  The constituent materials of various resins include phenolic resin, epoxy resin, melamine resin, diallyl phthalate resin, urea resin, unsaturated polyester resin, alkyd resin, polyurethane, thermosetting polyimide, thermosetting resin, acrylic resin, polycarbonate, Examples thereof include thermoplastic resins such as polyethylene, polypropylene, polystyrene, polyvinyl acetate, polyolefin, and polyvinyl chloride, and one or more of these can be used in combination.

  Examples of the various papers include kraft paper, cotton linter paper, paper base materials mainly composed of linter and kraft pulp mixed paper, and the like. Further, these paper base materials may be used alone as the base material layer 12, resin impregnated paper obtained by impregnating these paper base materials with resin, titanium oxide-containing paper containing a pigment such as titanium oxide, or the like. May be used as the base material layer 12.

  As various kinds of cloth, a woven cloth or a non-woven cloth obtained by collecting a large number of fibers and processing them into a thin plate shape can be used.

  The fibers are not particularly limited, and examples thereof include inorganic fibers such as alumina fibers, silica fibers, and glass fibers, and chemically synthetic fibers such as cellulose fibers, polyolefin fibers, polyester fibers, and aramid fibers.

  Moreover, as various cloth, what made resin, a pigment, etc. contain in a woven fabric, a nonwoven fabric, etc. may be sufficient.

  Among the above-described materials, as the base material layer 12, it is particularly preferable to use a material made of cloth (glass cloth) made of glass fibers or a prepreg based on glass cloth. Thereby, heat resistance, incombustibility, rigidity, bending workability, etc. can be provided to the melamine decorative material 100.

  Moreover, as glass which comprises a glass cloth, E glass, C glass, A glass, S glass, D glass, NE glass, T glass, H glass etc. are mentioned, for example. Among these, T glass is preferable. Thereby, the thermal expansion coefficient of a glass cloth can be made small.

The weight of the glass cloth is not particularly limited, but if it is necessary to satisfy the “combustible cracks / penetration after combustion” requirement of Article 2-9 of the Building Standards Act The basis weight is preferably 100 g / m ² or more. Moreover, although the upper limit of a weight does not require a restriction | limiting especially, the basic weight of 250 g / m < ² > or less is preferable from the surface of material cost and workability.

  The prepreg is not particularly limited, and for example, the prepreg may be obtained by impregnating the above-mentioned glass cloth with a resin composition containing a thermoplastic resin, a thermosetting resin, or the like.

  The content of the resin composition contained in the prepreg is not particularly limited as long as the interlayer adhesion strength with the surface layer 11 is sufficient for forming the melamine decorative material 100, but the resin composition is a thermoplastic resin. Is used, the prepreg preferably contains 1% by mass or more and 20% by mass or less, and more preferably 1% by mass or more and 10% by mass or less. Moreover, when using a thermosetting resin as a resin composition, it is preferable to contain 1 mass% or more and 20 mass% or less by solid content in a prepreg, and it is more preferable to contain 2 mass% or more and 10 mass% or less. preferable. Thereby, the interlayer adhesive strength of the surface layer 11 and the base material layer 12 can be improved.

  The thermoplastic resin is not particularly limited, and examples thereof include an acrylic resin, a urethane resin, an ethylene vinyl acetate resin, and a styrene butadiene rubber (SBR). Among these, it is preferable to use an acrylic resin and / or a urethane resin.

  The thermosetting resin is not particularly limited, and examples thereof include phenol resin, epoxy resin, oxetane resin, (meth) acrylate resin, unsaturated polyester resin, diallyl phthalate resin, urea resin, and maleimide resin. Among these, a phenol resin is preferable from the viewpoint of nonflammability, heat resistance, and adhesion. These resins can be used alone or in combination.

  The prepreg can be produced by a conventionally known method. For example, the prepreg can be obtained by impregnating a glass cloth similar to the glass cloth described above with a varnish obtained by dissolving the resin composition in a solvent and drying the glass cloth.

  The thickness of the base material layer 12 is preferably 100 μm or more. Thereby, sufficient heat resistance and nonflammability can be imparted to the melamine decorative material 100. Further, the upper limit of the thickness is not particularly limited, but the thickness and weight of the melamine decorative material 100 increase as the thickness increases, and the cost also increases. Therefore, the upper limit of the thickness is set within an allowable range in the design of the final product. The thickness is preferably 350 μm or less. Moreover, when improving bending workability, it is preferable to make it thin, and it is more preferable to set it as 200 micrometers or less.

  In addition, between the surface layer 11 and the base material layer 12, you may have an intermediate | middle layer which joins these. The material constituting the intermediate layer is not particularly limited, but the solid content of the thermoplastic emulsion resin is preferably used. In the present specification, the thermoplastic emulsion resin is an emulsion obtained by dispersing a thermoplastic resin in a solvent. The solid content of the thermoplastic emulsion resin means a component obtained by removing the solvent from the thermoplastic emulsion resin.

  The solid content of the thermoplastic emulsion resin includes components present as emulsion resin particles, has adhesive properties with metals and various materials, and imparts flexibility to the melamine decorative material 100. As a result, the bending workability of the melamine decorative material 100 can be improved.

  The solid content of the thermoplastic emulsion resin is not particularly limited. For example, heat of acrylic resin, urethane resin, vinyl acetate copolymer, urethane acrylic composite particles, styrene butadiene rubber (SBR), nitrile rubber (NBR), or the like. The emulsion particle | grains of a plastic resin are mentioned. Among these, urethane acrylic composite particles are preferable. In the present specification, the urethane-acrylic composite particles mean those having a heterogeneous structure of an acrylic resin and a urethane resin in a single particle. In the present specification, “heterophasic structure” means a structure in which a plurality of phases composed of different types of resins are present in one particle, and examples thereof include a core-shell structure, a localized structure, and a sea-island structure. It is done.

  The melamine decorative material 100 as described above can be bent with a minimum bending radius of 10 mmR or less at normal temperature (usually about 20 to 30 ° C.), but is not particularly limited. The minimum bend radius R is the minimum at which 100% non-defective products can be obtained without causing defects such as cracking even when repeated cold bending is performed in one direction along a mold having a curved portion with a radius R. Means the radius R of the mold.

  Moreover, it is preferable that the whole thickness of the melamine decorative material 100 is 0.4 mm or less. Thereby, the melamine decorative material 100 can perform a bending process more easily.

<Method for producing melamine cosmetic material>
Next, the manufacturing method of the melamine decorative material mentioned above is demonstrated.
FIG. 2 is a process diagram showing an example of a method for producing a melamine decorative material of the present invention.

  First, as shown to Fig.2 (a), the melamine resin layer 120X which impregnated the melamine resin to the surface layer base material is prepared. The surface opposite to the design surface side of the melamine resin layer 120X may be impregnated with the solid content of the thermoplastic emulsion resin.

  The method for impregnating the surface layer base material with the melamine resin is not particularly limited. For example, a resin varnish obtained by dissolving the resin in a solvent is used, for example, a known device such as a spray device, a shower device, a kiss coater, or a comma coater. The method etc. which heat-dry at about 80-130 degreeC after coating are mentioned.

  Next, as shown in FIG. 2B, a composition containing a low refractive index material is applied on the melamine resin layer 120X to form a low refractive index material layer 110Y containing a low refractive index material, thereby forming a surface layer. Material 11 ′ is obtained.

  As the imparting method, a flow coating method, a spin coating method, a printing method, a laminating method, a spray method, a bar coating method, or the like can be used.

  Next, a base material layer forming material 12 ′ for forming the base material layer is prepared and superposed so that the melamine resin layer 120X of the surface layer forming material 11 ′ and the base material layer forming material 12 ′ are in contact with each other (FIG. 2 (c)).

  Next, the surface layer forming material 11 ′ and the base material layer forming material 12 ′ are pressurized toward the inside of each layer while being heated. Accordingly, the low refractive index material layer constituting the low refractive index material layer 110Y is buried in the melamine resin layer 120X, and the melamine resin constituting the melamine resin layer 120X appears on the surface, so that the melamine resin and the low refractive index material And a second layer 120 that includes a melamine resin and does not include a low refractive index material. As a result, a melamine decorative material 100 as shown in FIG. 1 is obtained.

  The conditions for heating and pressurizing (thermocompression bonding) the surface layer forming material 11 ′ and the base material layer forming material 12 ′ are not particularly limited, but are preferably performed at a heating temperature of 130 to 150 ° C. and a pressure of 2 to 8 MPa. The time for thermocompression bonding is preferably 10 to 60 minutes.

  As mentioned above, although preferred embodiment of the melamine decorative material of this invention was described, this invention is not limited to this.

  For example, the melamine decorative material of the present invention is not limited to the form of the melamine decorative material 100 shown in FIG. 1. For example, the base material layer 12 may be omitted or the second layer 120 may be omitted.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example and a comparative example, this invention is not limited to this.

1. Production of melamine cosmetic material (Example 1)
Using a titanium oxide-containing decorative paper (Dai Nippon Printing Co., Ltd.) having a basis weight of 80 g / m ² as the surface layer base material, an emulsion of urethane acrylic composite particles on the side opposite to the design surface of the titanium oxide-containing decorative paper (Manufactured by Chuo Rika Kogyo Co., Ltd., trade name “SU-100”, average particle size: 84 nm, dispersion medium: water) was applied to a solid content of 40 g / m ^2, and then the decorative paper On the design surface side, melamine resin varnish (reaction molar ratio 1.4, resin solid content 50% by mass) was applied at 50 g / m ^2, and then dried for 90 seconds with a 120 ° C. hot air dryer, A melamine resin layer having a resin ratio of 53% and a volatile content of 3% was obtained.

  The melamine resin varnish is prepared by adding raw material melamine and formalin to a reaction kettle at a predetermined blending ratio, adding a catalyst, raising the temperature to the boiling point, performing a reflux reaction, and confirming that melamine dissolution has been completed. When it reached, it was synthesized by adjusting the resin solids by dehydration and cooling.

  On the other hand, a fluororesin (made by Daikin Industries, trade name “Zeffle GK-570”, refractive index after curing: less than 1.50) and a curing agent (made by Asahi Kasei Chemicals, trade name “Duranate TPA-100”) are mixed with NCO / The mixture A was mixed so that the OH molar ratio was 1.0, and diluted with butyl acetate so as to have a solid content of 8.0%, thereby preparing a composition A containing a low refractive index material.

The melamine resin layer was coated with the composition A by a flow coat method and dried at 100 ° C. for 1 minute to form a low refractive index material layer on the melamine resin layer (coating amount after drying: 5 g / m ^2). ).

  A laminate of the obtained melamine resin layer and low refractive index material layer is overlaid with a glass cloth having a thickness of 0.2 mm as a base material layer forming material (trade name “WEA 7628” manufactured by Nanya Plastics), and 140 ° C. Heat-press molding was performed for 40 minutes under the condition of 2 MPa to obtain a melamine decorative material having a thickness of 0.3 mm. In addition, the ratio for which the 1st area | region comprised with the melamine resin in the design surface of the obtained melamine decorative material occupied was 4.5%. Moreover, the thickness of the 1st layer containing a melamine resin and a low-refractive-index material was 5 micrometers.

(Examples 2 to 5)
The content of the low refractive index material in the composition A containing the low refractive index material, the low refractive index material layer so that the proportion of the first region in the design surface of the melamine decorative material becomes the value shown in Table 1 A melamine decorative material having a thickness of 0.3 mm was obtained in the same manner as in Example 1 except that the thickness, the conditions of heat and pressure molding were changed.

(Example 6)
A melamine decorative material having a thickness of 0.3 mm was obtained in the same manner as in Example 3 except that the low refractive index material layer was formed as follows.

  Acrylic resin (manufactured by DIC, trade name “Acridic A-801-P”, refractive index after curing: 1.50) and curing agent (trade name “Duranate TPA-100”, manufactured by Asahi Kasei Chemicals) Mixing was performed so that the OH molar ratio was 1.0, and the mixture was diluted with butyl acetate so as to have a solid content of 1.5% to prepare a composition B containing a low refractive index material.

Composition B was coated on the melamine resin layer by a flow coating method and dried at 100 ° C. for 1 minute to form a low refractive index material layer on the melamine resin layer (coating amount after drying: 1 g / m ^2). ).

(Example 7)
A melamine decorative material having a thickness of 0.3 mm was obtained in the same manner as in Example 3 except that the low refractive index material layer was formed as follows.

  Silicone resin (manufactured by Shin-Etsu Chemical Co., Ltd., trade name “KP-86”, refractive index after curing: less than 1.50) is diluted with isopropyl alcohol so as to have a solid content of 1.5%, and a low refractive index material is included. Composition C was prepared.

Composition C was coated on the melamine resin layer by a flow coating method and dried at room temperature for 1 hour to form a low refractive index material layer on the melamine resin layer (coating amount after drying: 1 g / m ^2). ).

(Example 8)
A melamine decorative material having a thickness of 0.3 mm was obtained in the same manner as in Example 3 except that the low refractive index material layer was formed as follows.

  Melamine resin varnish: 15 g, silica (manufactured by Nissan Chemical Co., Ltd., “Snowtex 50”, refractive index: less than 1.50): 85 g was added and mixed to prepare a composition D containing a low refractive index material. .

The melamine resin layer was coated with the composition D by a spray coating method and dried at 120 ° C. for 1 minute to form a low refractive index material layer on the melamine resin layer (coating amount after drying: 10 g / m ^2). ).
The thickness of the first layer was 10 μm.

(Comparative Example 1)
Using a titanium oxide-containing decorative paper (Dai Nippon Printing Co., Ltd.) having a basis weight of 80 g / m ² as the surface layer base material, an emulsion of urethane acrylic composite particles on the side opposite to the design surface of the titanium oxide-containing decorative paper (Manufactured by Chuo Rika Kogyo Co., Ltd., trade name “SU-100”, average particle size: 84 nm, dispersion medium: water) was applied to a solid content of 40 g / m ^2, and then the decorative paper On the design surface side, melamine resin varnish (reaction molar ratio 1.4, resin solid content 50% by mass) was applied at 50 g / m ^2, and then dried for 90 seconds with a 120 ° C. hot air dryer, A melamine resin layer having a resin ratio of 53% and a volatile content of 3% was obtained.

  The melamine resin varnish is prepared by adding raw material melamine and formalin to a reaction kettle at a predetermined blending ratio, adding a catalyst, raising the temperature to the boiling point, performing a reflux reaction, and confirming that melamine dissolution has been completed. When it reached, it was synthesized by adjusting the resin solids by dehydration and cooling.

  The obtained melamine resin layer is overlaid with a glass cloth having a thickness of 0.2 mm (trade name “WEA 7628”, manufactured by Nanya Plastic Co., Ltd.) as a base material layer forming material, and heated and pressurized at 140 ° C. and 2 MPa for 40 minutes. Molding was performed to obtain a melamine decorative material having a thickness of 0.3 mm.

(Comparative Example 2)
On the layer comprised with the melamine resin of the melamine decorative material obtained similarly to the comparative example 1, the low refractive index material layer was formed as follows.

  Fluoropolymer (Daikin Kogyo, trade name “Zeffle GK-570”, refractive index after curing: less than 1.50) and curing agent (made by Asahi Kasei Chemicals, trade name “Duranate TPA-100”), NCO / OH mole The mixture was mixed so that the ratio = 1.0, and diluted with butyl acetate so as to have a solid content of 4.0% to prepare a composition D containing a low refractive index material.

The composition D is coated on the melamine decorative material of Comparative Example 1 by a flow coating method, dried at 100 ° C. for 1 minute, and cured at room temperature for 7 days, and a low refractive index material layer is formed on the melamine resin layer. It was formed (coating amount after drying: 2 g / m ² ).

  In addition, the ratio for which the 1st area | region comprised with the melamine resin in the design surface of the obtained melamine decorative material occupied was 0%. The thickness of the low refractive index material layer on the surface of the obtained melamine decorative material was 2 μm.

(Comparative Example 3)
The thickness of 0.3 mm was the same as Comparative Example 2 except that the coating amount of the composition D was changed so that the thickness of the low refractive index material layer on the surface of the melamine decorative material became the value shown in Table 1. The melamine cosmetic material was obtained. In addition, the ratio for which the 1st area | region comprised with the melamine resin in the design surface of the obtained melamine decorative material occupied was 0%. The thickness of the low refractive index material layer on the surface of the obtained melamine decorative material was 10 μm.

  Table 1 shows the ratio of the first region, the thickness of the first layer, and the like, such as the types of the low refractive index materials of each Example and each Comparative Example.

2. Test Method (1) Cosmetic Pattern Sharpness The design surfaces of the melamine decorative materials of each Example and each Comparative Example were visually observed from various angles, and evaluation was performed according to the following criteria.

◎: The cosmetic pattern clearly appears clearer than Comparative Example 1 ○: The cosmetic pattern looks clearer than Comparative Example 1 ×: The cosmetic pattern does not appear clear (equal or less than Comparative Example 1)

(2) Fingerprint resistance A fingerprint was attached to the design surface of the melamine decorative material of each example and each comparative example, visually observed, and evaluated according to the following criteria.

◎: The fingerprint is clearly less noticeable than Comparative Example 1 ○: The fingerprint is less noticeable than Comparative Example 1 ×: The fingerprint is noticeable (equal to or less than Comparative Example 1)

(3) Appearance (whitening / turbidity)
The design surfaces of the melamine decorative materials of each Example and each Comparative Example were visually observed from various angles, and evaluated according to the following criteria.

◎: No whitening or turbidity is observed ○: Slight whitening or turbidity is observed, but no problem in practical use ×: Whitening / turbidity is observed

(4) Adhesiveness On the design surface of the melamine decorative material of each example and each comparative example, cellophane tape (manufactured by Nichiban Co., Ltd., trade name “cello tape (industrial,“ cello tape ”is a registered trademark) No. 405 18 mm × 35 m) ) And rub it with your fingers (make sure that the color seen through the tape changes uniformly). Within 5 minutes after pasting, it is peeled off in the direction of 60 degrees and evaluated according to the following criteria.

○: No peeling ×: With peeling

(5) Room temperature bendability (inner bending, outer bending)
The melamine decorative material of each example and each comparative example was bent against a specified R jig and evaluated according to the following criteria.

Inner bending ○: Bent at 4 mmR, no defects such as cracks ×: Bent at 4 mmR, there are defects such as cracks External bending ○: Bent at 10 mmR, no defects such as cracks ×: Bent at 10 mmR, There are defects such as cracks

(6) Surface hardness (pencil hardness) test The melamine decorative material of each Example and each comparative example was evaluated by a pencil hardness test in accordance with JIS K5600.

○: Hardness is 5H or more ×: Hardness is 4H or less

(7) Heat resistance It processed by the method based on the heat resistance test of JISK6902, and the presence or absence of abnormalities, such as a swelling, peeling, and a crack, was confirmed after the test.

○: None ×: Available

(8) Hot water resistance The treatment was performed by a method based on the hot water resistance test of JIS K6902, and after the test, the presence or absence of swelling and whitening was confirmed.

○: None ×: Available

(9) Contamination resistance test It processed by the method based on the contamination resistance test of JISK6902, and after the test, the presence or absence of the contamination material residue on the surface was confirmed.

○: None ×: Available

(10) Light resistance test The color difference ΔE and grade measured by a method based on the light resistance test of JIS K6902 were confirmed, and evaluation was performed according to the following criteria.

△ E
○: After standing for 168 hours ΔE is 3.0 or less ×: After standing for 168 hours ΔE is greater than 3.0 Grade ○: After standing for 168 hours, grade is 3 or more ×: After standing for 168 hours, grade is 2 or less

(11) Wear resistance test The amount of wear and the wear value measured by a method based on the wear resistance test of JIS K6902 were confirmed, and evaluation was performed according to the following criteria.

Wear amount ○: 0.1 g / 100 or less ×: Greater than 0.1 g / 100 Wear value ○: Vertical plane: 150 or more, horizontal plane: 300 or more ×: Vertical plane: smaller than 150, horizontal plane: smaller than 300

(12) Crack resistance test It processed by the method based on the crack resistance test of JISK6902, and after the test, the presence or absence and the grade of a crack were confirmed, and the following reference | standard evaluated.

○: Grade 3 or higher ×: Grade 2 or lower

(13) Boiling resistance test The weight increase rate measured by the method based on the boiling resistance test of JIS K6902 and the appearance after the test were evaluated according to the following criteria.

Weight increase rate ○: 16% or less ×: greater than 16% Appearance after test ○: No swelling or peeling ×: There is swelling or peeling

(14) Dimensional stability test The vertical total change rate and the horizontal total change rate measured by a method based on the dimensional stability test of JIS K6902 were evaluated according to the following criteria.

Vertical change rate ○: 1.1% or less ×: Greater than 1.1% Horizontal change rate ○: 1.4% or less ×: Greater than 1.4%

(15) Exothermic (non-combustible) test Japanese Building General Test Site standard “Fireproof Performance Test / Evaluation Business Method” 4.10 Non-combustible performance test / evaluation method (2) ii) 4.10.2 The exothermic test / evaluation method was used.

The item of the above-mentioned business standard “Fireproofing Performance Test / Evaluation Business Method” describes the performance evaluation method related to the certification based on the provisions of Article 2, Item 9 (non-combustible material) of the Building Standard Law.
Evaluation was performed based on the following criteria.

Total calorific value ○: 8 MJ / m ² or less ×: Greater than 8 MJ / m ² Maximum heat generation rate ○: Maximum heat generation rate does not exceed 200 kW / m ² continuously for 10 seconds or more ×: Does not satisfy the above range Hole / crack ○: There is no crack reaching the through hole or the back surface. ×: There is a crack reaching the through hole or the back surface. The results are shown in Table 2.

  As can be seen from Table 2, the melamine decorative material of the present invention can clearly display the decorative pattern. In addition, the melamine decorative material of the present invention was not easily noticeable with fingerprints and was excellent in various durability. On the other hand, the melamine decorative material of Comparative Example 1 could not display the makeup pattern clearly, and the fingerprints and the like were conspicuous. Moreover, the melamine decorative material of Comparative Examples 2 and 3 did not have sufficient durability.

DESCRIPTION OF SYMBOLS 100 Melamine decorative material 11 Surface layer 11 'Surface layer formation material 110 1st layer 110Y Low refractive index material layer 120X Melamine resin layer 111 1st area | region 112 2nd area | region 12 Base material layer 12' Base material layer formation material 120 1st 2 layers X Melamine resin Y Low refractive index material

Claims (6)

On the surface, a first region composed of melamine resin,
And a second region composed of a low refractive index material having a lower refractive index than that of the melamine resin.   2. The melamine cosmetic material according to claim 1, wherein a ratio of an area occupied by the first region on the surface in a plan view is 5% or more and 80% or less. A first layer comprising the melamine resin and the low refractive index material;
The melamine decorative material according to claim 1, further comprising: a second layer that includes the melamine resin and does not include the low refractive index material.   The melamine decorative material according to claim 3, wherein the first layer has a thickness of 0.01 μm to 100 μm.   The melamine decorative material according to any one of claims 1 to 4, wherein a refractive index of the low refractive index material is less than 1.50. A method for producing a melamine decorative material according to any one of claims 1 to 5,
Forming a melamine resin layer containing the melamine resin;
Providing a composition containing the low refractive index material on the melamine resin layer, and forming a low refractive index material layer containing the low refractive index material;
While heating the melamine resin layer and the low-refractive index material layer, pressurize the inside of each layer, the second layer containing the melamine resin and not containing the low-refractive index material, and the melamine resin And a first layer containing the low refractive index material. A method for producing a melamine cosmetic material, comprising:

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