KR20130028342A - Coating composition for surface protective deco sheet - Google Patents

Abstract

PURPOSE: A coating composition for surface-protective decoration sheet is provided to have excellent elongation, hardness, and antifouling property and to have excellent bending processability. CONSTITUTION: A coating composition comprises a solvent, thermosetting resin, and UV-curable resin. The thermosetting resin is polymethyl methacrylate. The UV-curable resin is a urethane acrylate oligomer. The solvent is one or more selected from toluene, propylene glycol methyl ether, methyl ethyl ketone, and dimethyl formamide. A decorative sheet is that a substrate sheet(10), a pattern layer(20), a transparent sheet layer(30), and a surface protection layer(60) are laminated in order. The surface protection layer is formed of the coating composition.

Description

Deco sheet coating composition for surface protection and decor sheet comprising the same {Coating composition for surface protective deco sheet}

The present invention relates to a coating composition for the surface of the decorative sheet and to a decorative sheet comprising the same, more specifically, the coating composition for the surface protective coating composition excellent in elongation, hardness and antifouling even without performing a POST CURE process and a decorative sheet comprising the same To provide.

A deco sheet is for the purpose of surface protection, decoration, etc. of adherends, such as a wooden board, and is used by sticking this to the surface of a adherend. Moreover, the decorative plate obtained by this is used for various building materials, furniture, etc.

As such a decorative sheet, the laminated body which laminated | stacked the base material sheet, a design layer, a synthetic resin layer, etc. is used, for example. These decorative sheets are usually surface protected to protect their outermost surfaces. In particular, in order to improve abrasion resistance, scratch resistance and the like, it is known to use a thermosetting resin or a UV curable resin for the surface protective layer.

But. The surface protective layer has room to improve wear resistance, scratch resistance, and the like. For example, when transporting the manufactured decorative sheet, the surface protective layers of the two decorative sheets are transported by overlapping each other, but when fine dust or the like is interposed between the two surface protective layers, the decorative sheet has its own weight and the dust. The surface protective layer is scratched.

On the other hand, when a surface protection layer is thickened in order to give higher hardness, the bending workability of a decoration sheet, etc. will deteriorate and it will become a cause of whitening phenomenon.

On the other hand, conventionally, the base sheet was manufactured in a semi-cured state by using a UV resin, and then a surface protective layer was attached, molded in a three-dimensional shape, and had to undergo a POST CURE process in order to completely cure again. However, in order to perform this POST CURE process, not only the equipment is required but also the process is complicated.

In addition, if only UV curable resin is contained, surface hardness can be increased, but elongation tends to be deteriorated, which is disadvantageous in forming a three-dimensional solid shape. In order to overcome this problem, there is a method of forming a post cured after forming it into a semi-cured state firstly, but most processors do not have a UV hardening device and the process becomes too complicated. There was a problem.

The present invention has been made to solve the above-described problems, the problem to be solved by the present invention is to provide a coating composition for the surface protection coating composition having excellent elongation, hardness and antifouling even without performing a POST CURE process and a decor sheet comprising the same will be.

In order to achieve the object of the present invention, there is provided a coating composition for protecting the surface of the decor sheet comprising a solvent, a thermosetting resin and a UV curable resin.

According to a preferred embodiment of the present invention, the thermosetting resin may be polymethyl methacrylate (PMMA), the UV curable resin may be a urethane acrylate oligomer.

According to another preferred embodiment of the present invention, it may comprise 5 to 40% by weight of the thermosetting resin and 3 to 15% by weight of the UV curable resin.

According to another preferred embodiment of the present invention, the PMMA may have a molecular weight of 50,000 ~ 150,000.

According to another preferred embodiment of the present invention, the urethane acrylate oligomer includes a bifunctional urethane acrylate oligomer (A) having a molecular weight of 1000 to 5000 and an aliphatic urethane acrylate oligomer (B) having a molecular weight of 1000 to 5000. can do.

According to another preferred embodiment of the present invention, the weight ratio of the bifunctional urethane acrylate oligomer (A) and aliphatic urethane acrylate oligomer (B) may be 3: 1 to 1.5: 1.

According to another preferred embodiment of the present invention, the solvent may be any one or more selected from the group consisting of toluene, propylene glycol methyl ether (PGME), methyl ethyl ketone and dimethylformamide.

According to another preferred embodiment of the present invention, in the decorative sheet laminated in the order of the base sheet, the design layer, the transparent sheet layer and the surface protective layer, the surface protective layer may be formed of the coating composition of the present invention.

According to another preferred embodiment of the present invention, the decor sheet may further include a primer layer on one side or both sides of the transparent sheet layer.

According to another preferred embodiment of the present invention, the thickness of the surface protective layer may be 1 ~ 15 ㎛.

Deco sheet containing the coating composition for the surface protection sheet of the present invention is excellent in elongation, hardness and antifouling even without performing the POST CURE process. Moreover, since it is not necessary to thicken a surface protection layer, it has favorable bending workability (three-dimensional workability).

In addition, since the thermosetting and UV curing materials are included at the same time, it is easy to control the physical properties of the coating liquid and to compensate for the disadvantages. It is possible to produce a decor sheet with excellent elongation and surface hardness characteristics, which are the basic characteristics of decor sheets.

1 is a cross-sectional view of a decorative sheet according to a preferred embodiment of the present invention.

As described above, the conventional coating composition for protecting the surface of the sheet has excellent hardness but low elongation.

Accordingly, the present invention sought to solve the above problems by providing a coating composition for protecting the surface of the decor sheet comprising a solvent, a thermosetting resin and a UV curable resin. Through this, the decor sheet including the coating composition for protecting the surface of the decor sheet of the present invention is excellent in elongation, hardness and antifouling even without performing the POST CURE process. Moreover, since it is not necessary to thicken a surface protection layer, it has favorable bending workability (three-dimensional workability).

In detail, the coating composition for protecting the surface of the decor sheet of the present invention should include both a thermosetting resin and a UV curable resin, and when only one of them is included, elongation and hardness may be reduced to achieve the object of the invention. 1).

Specifically, when only the UV curable resin is used, the hardness property is excellent but the elongation tends to be poor. When only the thermosetting resin is used, the elongation is excellent but the hardness property may be poor.

As the thermosetting resin that can be used in the present invention, PMMA, urethane, or the like can be used. As the UV curable resin, acrylate, urethane acrylate, epoxy acrylate and the like can be used.

Most preferably, however, the use of polymethyl methacrylate (PMMA) as the thermosetting resin and the combination of the urethane acrylate oligomer as the UV curable resin shows remarkably superior properties compared to other combinations (see Table 1). .

In this case, preferably, the thermosetting resin may be 5 to 40% by weight and 3 to 15% by weight of the UV curable resin in 100% by weight of the total coating composition. If the thermosetting resin is less than 5% by weight may cause a problem in elongation characteristics, and if it exceeds 40% by weight may cause problems in hardness. In addition, when the UV curable resin is less than 3% by weight, problems may occur in hardness, and when it exceeds 15% by weight, elongation and turbidity may occur.

According to a preferred embodiment of the present invention, the PMMA used in the present invention may have a molecular weight of 50,000 to 150,000.

According to a preferred embodiment of the present invention, the urethane acrylate oligomer may include a bifunctional urethane acrylate oligomer (A) having a molecular weight of 1000 to 5000 and an aliphatic urethane acrylate oligomer (B) having a molecular weight of 1000 to 5000. have. If the urethane acrylate oligomer includes only the urethane acrylate oligomer (A) may cause a problem that the hardness can be lowered, and if only the aliphatic urethane acrylate oligomer (B), may cause problems such as yellowing have.

The bifunctional urethane acrylate oligomer (A) is preferably a so-called bifunctional urethane acrylate oligomer having two radically polymerizable unsaturated groups in one molecule, and a weight average molecular weight having two or more hydroxyl groups in diisocyanate and one molecule. It is an oligomer whose weight average molecular weights are 1000-5000 which the polyhydric alcohol of 500-2000 and the (meth) acrylate compound which has not only a hydroxyl group at the terminal but also the radically polymerizable unsaturated group bond.

When the urethane acrylate oligomer (A) has a molecular weight of less than 1000, the flexibility of the urethane acrylate cannot be sufficiently exhibited in the resin layer after curing, and the workability in bending processing such as V-cutting and lapping processing and embossing are lowered. . Moreover, when molecular weight exceeds 5000, there exists a possibility that the characteristics, such as contamination resistance, may fall.

The diisocyanate is an aliphatic, alicyclic or aromatic isocyanate having two or more isocyanate groups in one molecule, for example, 2,4-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,6-hexa Methylene diisocyanate,

Isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate, etc. are mentioned.

Examples of the polyhydric alcohol having a weight average molecular weight of 500 to 2000 include polyester polyols, polyether polyols and polycarbonate polyols, and acrylic polyols having hydroxyl groups at both ends. Examples of the polyester polyol include (a) an addition reaction product of a diol compound having an aromatic or spiro ring skeleton with a lactone compound or a derivative thereof or an epoxy compound, (b) a condensation product of a polybasic acid and an alkylene glycol, and (c) There are ring-opening polyester compounds derived from cyclic ester compounds, and these may be used alone or in combination of two or more thereof. Examples of the polyether polyol include polytetramethylene ether glycol, polyethylene glycol and polypropylene glycol. Polyester diols having hydroxyl groups at both ends, which are obtained as a condensation product with alkylene glycol using adipic acid as the polybasic acid of the above (b) and having a weight average molecular weight of 500 to 2000, are preferably in various physical properties. Used.

Moreover, the (meth) acrylate which has not only a hydroxyl group at the terminal but also a radically polymerizable unsaturated group is an ester compound of acrylic acid or methacrylic acid or these derivatives, and has a hydroxyl group at the terminal. Specifically, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxycyclohexyl (meth) acrylate, 5 -(Meth) acrylic acid ester compound having one polymerizable unsaturated group such as hydroxycyclooctyl (meth) acrylate, 2-hydroxy-3-phenyloxypropyl acrylate or the like, or other polymerizable unsaturated groups in one molecule. (Meth) acrylic acid ester compound etc. which have two or more are illustrated.

More preferably, the urethane acrylate oligomer (A) of the present invention is a polyalcohol component comprising a polyester polyol having a weight average molecular weight of 500 to 2000 formed from alkylene glycol and adipic acid, and the diisocyanate component isophoronedi. The oligomer whose weight average molecular weight is 1000-3000 obtained by making isocyanate and making these the acrylate component the hydroxyethyl (meth) acrylic acid ester react is preferable.

The above-mentioned aliphatic urethane acrylate oligomer (B) which can be used in the present invention has radical polymerizable unsaturated groups such as 3 to 15 (meth) acryloyl groups in one molecule, and an aliphatic diisocyanate, a polyfunctional polyol, and It may be a polyfunctional (3 to 15 functional) urethane acrylate obtained by reacting a (meth) acrylate having not only a hydroxyl group at the terminal but also a radical polymerizable unsaturated group.

Examples of the aliphatic diisocyanate include 1,6-hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane diisocyanate and the like.

Moreover, the (meth) acrylate which has the said hydroxyl group and radically polymerizable unsaturated group is 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acryl (Meth) having one polymerizable unsaturated group such as acrylate, 4-hydroxycyclohexyl (meth) acrylate, 5-hydroxycyclooctyl (meth) acrylate, 2-hydroxy-3-phenyloxypropyl acrylate and the like Acrylic ester compound is mentioned.

Meanwhile, the weight ratio of the bifunctional urethane acrylate oligomer (A) and the aliphatic urethane acrylate oligomer (B) may be 3: 1 to 1.5: 1. If it is out of the above range, the hardness may decrease or whitening or cracking may occur (see Table 1).

According to a preferred embodiment of the present invention, the solvent may be any one or more selected from the group consisting of toluene, propylene glycol monomethyl ether (PGME), methyl ethyl ketone, and dimethylformamide.

Moreover, in this invention, you may contain the wax. In the case of containing wax, the sheet surface can be made active. As the wax, for example, a resin wax obtained by dissolving or dispersing resins such as polypropylene and polyethylene in an organic solvent can be used. As an organic solvent, it can select suitably according to the kind of resin to be used, for example among hydrocarbon type, ester type, ketone type, these mixed solvent, etc.

In the present invention, there is no restriction on the content of the wax, but may generally include 3 to 10% by weight.

The coating composition of this invention can be manufactured by mixing each of these components uniformly. The formation method of the surface protection layer by this composition can be performed according to a well-known method, For example, a coating film is formed with the said composition, and it heat-cures and hardens after UV-drying by well-known use conditions, and forms a surface protection layer. can do.

Next, the decorative sheet including the coating composition of the present invention described above will be described with reference to FIG.

As the base sheet 10 to which the coating composition of the present invention is applied, for example, paper, a nonwoven fabric, a thermoplastic resin sheet, a composite material thereof, or the like is used. Examples of the paper include thin paper, kraft paper, fine paper, linter paper, variety paper, sulfate paper, and Korean paper.

Moreover, as a nonwoven fabric, the nonwoven fabric containing fiber, such as polyester resin, an acrylic resin, nylon, vinylon, glass, is mentioned, for example. The basis weight of the paper or nonwoven fabric may be usually about 20 to 100 g / m 2. In addition, the paper or nonwoven fabric may be added with a resin such as acrylic resin, styrene butadiene rubber, melamine resin, urethane resin, or the like, in order to reinforce the interlaminar strength between the fibers or other layers or to prevent the bleeding (papermaking). After resin impregnation or papermaking). In addition, the decorative sheet which used paper (or nonwoven fabric) for a base material sheet becomes a decorative paper.

Examples of the thermoplastic resin sheet include acrylic resins, polyester resins, polyolefin resins, polyvinyl chloride resins, polystyrenes, ABS resins, polycarbonate resins, and polyamide resins. More specifically, following (1)-(4) is mentioned.

(1) Polyolefins such as polyethylene (high density, medium density or low density), polypropylene (isotactic type, or syndiotactic type), polybutene, ethylene-propylene copolymer, ethylene-propylene-butene copolymer, olefin thermoplastic elastomer, etc. System resin.

Further, the olefinic thermoplastic elastomer may include a hard segment made of crystalline polyolefin resin as described above, ethylene-propylene rubber, ethylene-propylene-diene rubber, atactic polypropylene, styrene-butadiene rubber, hydrogenated styrene-butadiene rubber. It is made by mixing soft segments made of elastomer, such as. The mixing ratio of the hard segment and the soft segment is about (soft segment / hard segment) = 5/95 to 40/60 (mass ratio). If necessary, the elastomer component is crosslinked by known crosslinking agents such as sulfur, hydrogen peroxide and the like.

(2) acrylic resins such as polymethyl (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, and methyl (meth) acrylate-styrene copolymer ( Here, (meth) acrylate means acrylate or methacrylate).

(3) Polyester resins, such as a polyethylene terephthalate, a polybutylene terephthalate, an ethylene terephthalate isophthalate copolymer, a polyethylene naphthalate, a polyester thermoplastic elastomer, and an amorphous polyester. In addition, the polyester thermoplastic elastomer may be a block polymer using an aromatic polyester having a high crystal and melting point in a hard segment and an amorphous polyether having a glass transition temperature of -70 ° C. or lower in the soft segment. Polybutylene terephthalate is used for this highly aromatic polyester, for example, polytetramethylene glycol etc. are used for the said amorphous polyether. In addition, an amorphous polyester is typically an ethylene glycol-1,4-cyclohexanedimethanol-terephthalic acid copolymer.

Furthermore, polycarbonate resin, polyvinyl chloride resin, polyamide resin, polyphenylene sulfide, polyether ether ketone and the like can be used.

As the layer structure of the base material sheet 10 of this invention, the paper, nonwoven fabric, a thermoplastic resin sheet, etc. which were mentioned above can be laminated | stacked and used by single layer or two or more layers.

Although the thickness (total thickness in the case of a laminated body) of a base material sheet is not limited, Generally, it may be about 25-500 micrometers.

Next, the design layer 20 will be described. In addition to the patterns of natural materials such as wood grain and bark grain, the design layer may also display letters, symbols, drawings, and the like. When providing a design layer, the formation method, material, a kind of pattern, etc. of a design layer are not specifically limited. Formation of a design layer can be normally formed by well-known printing methods, such as gravure printing, silkscreen printing, offset printing, gravure offset printing, inkjet printing, etc. using ink. The pattern may be, for example, a wood grain, an indentation, a sandstone, a cloth, a tile, a brick, a leather grain, a letter, a symbol, a geometric shape, or a combination of two or more thereof.

The ink used for forming the pattern layer is selected from various additives such as 1) a vehicle containing a binder and the like, 2) colorants such as pigments and dyes, and 3) sieving pigments, stabilizers, plasticizers, catalysts and curing agents suitably added as optional components. It is composed.

The resin of the binder can be appropriately selected depending on physical properties required from a binder such as a thermoplastic resin, a thermosetting resin, and an ionizing radiation curable resin, printing suitability, and the like. For example, cellulose-based resins such as nitrocellulose, cellulose acetate and cellulose acetate propionate; Urethane resins, vinyl chloride-vinyl acetate, in addition to acrylic resins such as poly (meth) acrylate, butyl poly (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate and 2-hydroxyethyl copolymer

Copolymers, polyester resins, alkyd resins and the like can be used singly or in combination thereof.

Moreover, as a coloring agent, inorganic pigments, such as titanium bag, carbon black, iron black, iron group, sulfur lead, ultramarine, organic pigments, such as aniline black, quinacridone red, isoindolinone yellow, and phthalocyanine blue, and titanium dioxide coating Various dyes can be used in addition to bright pigments such as thin powders such as mica and aluminum.

Next, the transparent sheet layer 30 will be described. The transparent sheet layer is not limited as long as it is transparent. Therefore, it includes colorless transparent, colored transparent, translucent, and the like. As the transparent sheet layer, for example, one formed of a thermoplastic resin can be preferably used. Specifically, soft, semi-rigid or hard polyvinyl chloride, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyethylene, polypropylene, ethylene vinyl acetate copolymer, ethylene acrylic acid copolymer, ethylene acrylic acid ester air Copolymer, ionomer, acrylic acid ester, methacrylic acid ester, etc. are mentioned. In this invention, polyolefin resin, such as polypropylene, is especially preferable as a transparent sheet layer.

The transparent sheet layer may be colored as needed. In this case, a coloring material (pigment or dye) can be added and colored with respect to the above-mentioned thermoplastic resin. As the coloring material, known or commercially available pigments or dyes can be suitably used. These can be selected from one kind or two or more kinds. The addition amount of the coloring material can be appropriately set in accordance with a desired color tone or the like.

If necessary, the transparent sheet layer may contain various additives such as fillers, matting agents, foaming agents, flame retardants, lubricants, antistatic agents, antioxidants, ultraviolet absorbers, light stabilizers, radical trapping agents, and soft components (for example, rubbers). It may be.

Flame retardants are added to impart flame resistance. For example, paraffin chloride, tricresyl phosphate, chlorinated oil, tetrachlorophthalic anhydride, tetrabromophthalic anhydride, tetrabromobisphenol A, dibromopropyl phosphate, tri (2,3-dibromopropyl) phosphate , Antimony oxide, hydrous alumina, barium borate and the like can be preferably used.

Antioxidants are added to inhibit or prevent oxidative degradation. For example, alkylphenols, amines, quinones, etc. are preferable.

The ultraviolet absorber absorbs ultraviolet rays in the region having a wavelength of 280 to 450 nm which causes deterioration of the resin (especially polyolefin resin). For example, various ultraviolet absorbers, such as a benzophenone type, a salicylate type, a benzotriazole type, an acrylonitrile type, are mentioned.

All.

Radical trapping agents are added to improve weather resistance by preventing discoloration, cracking, whitening, deterioration of strength due to sunlight and the like. As the radical trapping agent, bis- (2,2,6,6-tetramethyl-4-piperidinyl) sebacate or hindered amine radical trapping agent, piperidyl radical trapping agent and the like are used.

The formation method of a transparent sheet layer is not limited, For example, the method of laminating | stacking a preformed sheet or film to an adjacent layer, The method of coating on an adjacent layer by melt-extruding the resin composition which can form a transparent sheet layer, Any one of the method of laminating with an adjacent layer can be used. In this invention, it is especially preferable to melt-extrude to form a transparent sheet layer. In particular, it is preferable that the transparent sheet layer is melt-extruded and coated with a polyolefin resin. Specifically, on the design layer

The transparent sheet layer can be preferably formed by previously forming an adhesive bond layer in this, and melt-extruding and coating a polypropylene thermoplastic elastomer on this adhesive bond layer. The melt extrusion method may be carried out according to a known method using, for example, a T die or the like.

.

Although the thickness of a transparent sheet layer can be suitably set according to the use of a final product, a usage method, etc., it is generally preferable to set it as about 50-250 micrometers, especially about 20-200 micrometers.

Corona discharge treatment may be performed to the surface (front side) and / or back side of a transparent sheet layer as needed in order to improve adhesiveness with an adjacent layer. The method of corona discharge treatment can be performed in accordance with a well-known method.

In addition, a primer layer may be formed on the surface (front side) and / or the back side of the transparent sheet layer. As a material for forming the primer layers 40 and 50, for example, polyester resin, polyurethane resin, acrylic resin, polycarbonate resin, vinyl chloride / vinyl acetate copolymer, polyvinyl butyral resin, nitrocellulose In addition to resins, compounds such as alkyl titanate and ethyleneimine can also be used. In particular, use of a two-component curable urethane resin is preferable as the primer layer. Fatty acid isocyanates (aliphatic isocyanates) such as hexamethylene diisocyanate (HMDI) as the isocyanates, and acrylic polyols are preferably used as the polyols, because better weather resistance, adhesion and the like are obtained.

Formation of a primer layer is used as it is or in the state melt | dissolved or disperse | distributed in a solvent, A primer layer can be formed by a well-known printing method, a coating method, etc.

In the decorative sheet of the present invention, an adhesive layer (not shown) may be formed between the pattern layer 20 and the transparent sheet layer 30. The adhesive agent used for an adhesive bond layer can be suitably selected from the well-known or commercially available adhesive according to the component which comprises a design layer or a transparent sheet layer. For example, in addition to polyolefin resins, such as polyethylene and a polypropylene, thermosetting resins, such as a polyester resin, a polyurethane resin, and an epoxy resin, are mentioned. These resins can also be used in the state of an emulsion.

Especially, in this invention, a urethane type resin adhesive agent is preferable at the point which can raise heat resistance etc. more. The urethane-based resin adhesive includes a two-component curable urethane resin containing polyol as a main base and an isocyanate as a crosslinking agent (curing agent).

The polyol has two or more hydroxyl groups in the molecule. Examples thereof include polyethylene glycol, polypropylene glycol, acryl polyol, polyester polyol, polyether polyol, polycarbonate polyol, and the like.

As the isocyanate, polyvalent isocyanates having two or more isocyanate groups are used in the molecule. For example, aromatic isocyanates such as 2,4-tolylene diisocyanate, xylene diisocyanate, 4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated diisocyanate Aliphatic (or alicyclic) isocyanates such as phenylmethane diisocyanate are used. Moreover, the adduct or multimer of the said various isocyanate can also be used. For example, the adduct of tolylene diisocyanate, the trimer of tolylene diisocyanate, etc. are mentioned.

Moreover, if necessary, a well-known easy adhesion process, such as a corona discharge process, a plasma process, a degreasing process, a surface roughening process, can also be given to an adhesive surface.

As a bonding method, it can carry out according to a well-known method according to the kind of adhesive agent etc. to be used. For example, by using polyolefin resins such as polyethylene and polypropylene, thermosetting properties such as a method of coating onto a design layer by melt extrusion (extrusion coating method), a polyester resin, a polyurethane resin, an epoxy resin, and the like A crosslinking agent such as isocyanate or amine, a polymerization initiator such as methyl ethyl ketone peroxide, hydroperoxide, azabisisobutyronitrile, or a polymerization accelerator such as cobalt naphthenate or dimethylaniline is added to the resin as necessary. Coating and dry lamination can be used. In addition, in the present invention, a design layer and a transparent sheet layer may be laminated by thermocompression bonding using an adhesive capable of thermocompression bonding.

Moreover, in this invention, well-known easily bonding process, such as a corona discharge process, a plasma process, a degreasing process, and a surface roughening process, can also be given to an adhesive surface as needed.

Although the thickness of an adhesive bond layer changes with a surface protection layer, the kind of adhesive agent, etc., Usually, what is necessary is just about 0.1-30 micrometers.

Next, the surface protection layer 60 will be described. The surface protective layer of the present invention can be cured by forming a coating film of the coating composition of the present invention described above. In this case, the thickness of the surface protective layer is preferably 1 ~ 15㎛.

The surface protection layer (that is, the outermost surface of the decorative sheet) may preferably have an uneven shape by embossing or the like, and more preferably, by wiping the ink to fill the embossed recesses, The surface can be overcoat-treated.

Embossing is performed to give a decorative sheet a predetermined texture, such as a wooden board surface. For example, the acrylic resin is heat-softened on a heating drum, further heated to 160 to 180 ° C. with an infrared radiation heater, and press-molded by an embossing plate provided with a concave-convex shape of a desired shape, followed by cooling fixing. It can use a well-known single | leaf or roto type embossing machine. As uneven | corrugated shape, a wood grain conduit, a relief (an uneven | corrugated shape of a rolled ring), a hairline, a sand grain, a checkered pattern, etc. are mentioned, for example, A desired shape can be suitably selected from these. .

Wiping process means the process which fills ink, scratching the surface with a doctor blade in the recessed part provided by the embossing process. As a wiping ink, the ink which uses a two-component curable urethane resin as a binder can be used normally. In the wiping process, the product value can be increased by expressing a design that is closer to the actual wood grain by performing the rough grain conduit irregularities.

The adherend to which the decorative sheet of the present invention is applied is not limited, and the same one as the known decorative sheet can be used. For example, wood materials, metals, ceramics, plastics, glass, etc. are mentioned. In particular, the decorative sheet of the present invention can be preferably used for wood materials. Specific examples of the wood materials include stone boards made of various materials such as cedar, fir, zelkova, pine, nawang, teak and melapi, wood veneer, wood plywood, particle board, and medium density fiberboard (MDF). Can be.

The decorative sheet of the present invention is laminated on various adherends and the like and used as a decorative plate. A lamination method is not limited, For example, the method of sticking a decorative sheet to an adherend with an adhesive agent, etc. can be used. The adhesive can be appropriately selected from known adhesives depending on the kind of the adherend and the like. For example, butadiene acrylonitrile rubber, neoprene rubber, natural rubber, etc. are mentioned besides polyvinyl acetate, polyvinyl chloride, a vinyl chloride vinyl acetate copolymer, an ethylene acrylic acid copolymer, an ionomer, etc.

The decorative plate thus produced is preferably used for, for example, interior decoration of buildings such as walls, ceilings and floors, surface decoration plates of windows and doors such as window frames, doors, and railings, and surface decoration plates of cabinets such as furniture or pharmacopoeia and office equipment. Can be.

EMBODIMENT OF THE INVENTION Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not interpreted limitedly based on description of this Example.

≪ Example 1 >

First, a coating composition was prepared. Specifically, PMMA (Mw about 100,000) 14% by weight, urethane acrylate oligomer (A) (Miwon Corporation, Miramer3200, Mw 1,900), 4% by weight, urethane acrylate oligomer B (Miwon Corporation, Miramer UA5095, Mw 3,600) 2% by weight %, Photoinitiator (Irgacure 184) 1% by weight, additive 0.5wt% (Polyether modified polydimethylsiloxane, BYK333), PGME and toluene mixed solvent 78.5% by weight (1: 1 volume ratio) was uniformly mixed.

Thereafter, the coating composition prepared on the primer layer 50 of the decor sheet (base sheet, pattern layer, primer layer, transparent resin layer and primer layer) as shown in FIG. The coating was made so that the temperature was set to about 75 ° C. by drying, and the UV light amount was cured at 700 mJ / cm 2 (based on UV A). After curing, the mixture was aged at room temperature for about 6 hours and then aged at 55 ° C. for 12 hours to produce a decor sheet.

<Example 2>

Except for using the urethane acrylate oligomer (A), 5% by weight, 1% by weight of the urethane acrylate oligomer (B) was carried out in the same manner as in Example 1 to prepare a decor sheet.

<Example 3>

Except for using the urethane acrylate oligomer (A), 1% by weight, 5% by weight of the urethane acrylate oligomer (B) was carried out in the same manner as in Example 1 to prepare a deco sheet.

&Lt; Comparative Example 1 &

A decoration sheet was prepared in the same manner as in Example 1 except that 21 wt% of PMMA was added and no urethane acrylate oligomer (A) was used.

Comparative Example 2

Except for using the PMMA, 15% by weight of the urethane acrylate oligomer (A), 5% by weight of the urethane acrylate oligomer (B) was carried out in the same manner as in Example 1 to prepare a deco sheet.

&Lt; Comparative Example 3 &

Except for PMMA, except that silicon was used as the thermosetting resin was carried out in the same manner as in Example 1 to prepare a decor sheet.

&Lt; Comparative Example 4 &

Except for using the urethane acrylate oligomer (A) and urethane acrylate oligomer (B) as a UV curable resin, except that urethane acrylate (Miwon Corporation, PU5000) was used in the same manner as in Example 1 to prepare a decor sheet. .

<Experimental Example>

The following physical properties of the decor sheet of Examples 1 to 3 and Comparative Examples 1 to 4 were evaluated, and the results are shown in Table 1.

Elongation (%)

Elongation was evaluated according to the ASTM-D882 method.

Specifically, 10mm in width and 150mm in length are marked at 10mm intervals in the center and left for 3 minutes on a 100 ° C hot plate, and then the strains of the parts having no abnormality on the surface when pulled from both sides are measured.

It calculates as strain length ((DELTA) L) / initial length (L: 10mm) x100.

2. Pencil Hardness

The Mitsubishi pencil is fixed at 45 degrees to the coated surface and a load of 1,000g is applied, and then the surface is contacted to determine whether scratches have occurred.

3. Antifouling property

After dropping 1 ~ 2 drops of espresso coffee on the coating layer, it is judged to be well wiped when wiped off with water after 24 hours.

4. Adhesiveness

Measurement was made according to ASTM D 3002, 3559.

Specifically, the coating surface is cut to 100 × 100 using the BYK Cross Cut Tester. After attaching the Permacel tape on the lattice-coated surface, observe the surface condition after removal. Count the number of remaining cells out of 100 cells and measure.

5. Appearance

Appearance was recorded after curing, after aging, visual observation of surface irregularities, cracks, whitening phenomenon, and the like when measuring elongation.

Elongation (%) Pencil hardness Antifouling Adhesion Exterior Example 1 250 H Good 100/100 Good Example 2 250 F Good 100/100 all sorts of flowers Example 3 200 H Good 100/100 crack Comparative Example 1 250 B Good 100/100 Good Comparative Example 2 100 H Good 100/100 all sorts of flowers Comparative Example 3 80 F Good 100/100 Good Comparative Example 4 70 2H Good 100/100 crack

As can be seen from Table 1 it can be seen that the decor sheet of Examples 1 to 3 satisfying the conditions of the present invention has excellent physical properties compared to the decor sheet of Comparative Examples 1 to 4 not satisfying this. In addition, the decor sheet of Examples 1 to 3 in which the content of the urethane acrylate oligomers (A) and (B) satisfies the scope of the present invention has excellent physical properties compared to the decor sheets of Comparative Examples 1 and 2 that do not satisfy this. You can see that.

Decorative sheet surface coating composition of the present invention and the decorative sheet including the same can be widely used as a decorative sheet such as furniture.

1O: base sheet 20: pattern layer
30: transparent resin layer 40, 50: primer layer
60: surface protective layer

Claims (11)

A coating composition for decorating the surface of a decor sheet comprising a solvent, a thermosetting resin, and a UV curable resin. The method of claim 1,
The thermosetting resin is a polymethyl methacrylate (PMMA) decorative sheet coating composition for surface protection. The method of claim 1,
The UV curable resin is a coating composition for surface protection surface decor sheet, characterized in that the urethane acrylate oligomer. The method of claim 1,
Deco sheet surface protective coating composition comprising 5 to 40% by weight of the thermosetting resin and 3 to 15% by weight of UV curable resin. The method of claim 2,
The PMMA is a coating composition for surface protection surface decoration sheet characterized in that the molecular weight of 50,000 ~ 150,000. The method of claim 3,
The urethane acrylate oligomer is a coating composition for decorating the sheet surface protection, characterized in that it comprises a bifunctional urethane acrylate oligomer (A) having a molecular weight of 1000 to 5000 (A) and an aliphatic urethane acrylate oligomer (B) having a molecular weight of 1000 to 5000. The method according to claim 6,
A coating composition for decorating a sheet surface protection, wherein the weight ratio of the bifunctional urethane acrylate oligomer (A) and the aliphatic urethane acrylate oligomer (B) is 3: 1 to 1.5: 1. The method of claim 1,
Wherein the solvent is any one or more selected from the group consisting of toluene, PGME (please specify the official name), methyl ethyl ketone and dimethylformamide coating composition for surface protection. Deco sheet laminated in the order of a base sheet, a pattern layer, a transparent sheet layer and a surface protective layer, wherein the surface protective layer is formed of the coating composition of any one of claims 1 to 8. 9. The method of claim 8,
The decor sheet is a decor sheet, characterized in that it further comprises a primer layer on one side or both sides of the transparent sheet layer. 10. The method of claim 9,
Deco sheet, characterized in that the thickness of the surface protective layer is 1 ~ 15 ㎛.

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