KR100843612B1 - Decoration sheet - Google Patents

Abstract

A decoration sheet is provided to improve storage modulus by using both a polyolefin color film layer and a glycol modified PET-G(Polyethylene Terephthalate) transparent film layer and to execute membrane and vacuum molding due to high storage modulus. A decoration sheet is composed of a polyolefin color film layer, a print layer, an adhesive layer, a glycol modified PET-G transparent film layer, a primer layer formed on one or both surfaces of the color film layer, and a surface treated layer. The thickness of the glycol modified PET-G transparent film layer is 100~400 micrometers. The polyolefin color film layer contains polypropylene or polyethylene. The primer layer contains polyurethane or polyisocyanate. The print layer contains polyester or polyisocyanate. The surface treated layer contains acrylate or polyurethane.

Description

Decoration sheet

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

Figure 2 is a graph showing the measurement of the change in storage modulus with temperature changes for the decor sheet composed of conventional polyolefin-based film only.

Figure 3 is a graph showing the measurement of the change in storage modulus of the decoration sheet according to the temperature change according to another embodiment of the present invention.

Figure 4 is a deco sheet consisting of a conventional PVC-based film, a deco sheet consisting only of a conventional glycol-modified polyethylene terephthalate (PET-G) -based film and storage according to temperature changes for the deco sheet according to another embodiment of the present invention It is a graph shown in order to compare the change of elastic modulus.

The present invention relates to a decor sheet, and more particularly, to a decor sheet that can implement the effect of securing the molding holding force capable of membrane molding and vacuum molding, while ensuring the appropriate flexibility.

In general, a decoration sheet (hereinafter referred to as a 'deco sheet') means a sheet for expressing various decorations such as wooden patterns and abstract patterns on furniture such as dressers and sinks.

Plasticized polyvinyl chloride materials, which are conventionally used for decorative sheets, have excellent physical properties and moldability. However, polyolefin resins, which have emerged as alternative materials for chemical products that may cause environmental problems, are difficult to form. There is a problem of poor appearance quality.

The olefin resin has excellent heat resistance and mechanical strength, excellent chemical resistance and electrical insulation, and is widely used for plastic films and sheets due to its nontoxicity. However, due to the inherent adhesive properties, such general propylene resins stick to the roll surface during calendering, and in particular, when ductility is imparted, such as plasticized polyvinyl chloride molded articles for decor sheets, the adhesion becomes more difficult and the molding is difficult. Since the surface and appearance quality of the product is also deteriorated, it is required to develop a product having excellent molding stability and surface quality for calendar molding. In addition, due to the intrinsic elastic modulus of the olefin-based film, membrane molding and vacuum molding are impossible, and low storage elastic modulus at low temperature does not provide a desired molding holding force.

Some of the polypropylene-based resin compositions developed to be calenderable so far have excellent moldability, but these resins are not ductile and have low heat resistance, such as plasticized polyvinyl chloride, or have limitations on the resin composition to secure molding stability. (Hanhwa Talc, Japan Idemitsu Et 4.0 wt% or less), which has the disadvantage of deteriorating the surface quality. If the surface quality is required to be improved, it is necessary to change raw materials or adjust the production speed, and cost increases due to the addition of expensive raw materials or lower productivity due to production speed control. In addition, even if the surface quality is secured, due to the lack of ductility of the polypropylene-based resin, cracks may occur when forming the membrane, there is a problem that the molding is impossible due to the lack of elastic modulus. In addition, when the decor sheet is formed of a conventional glycol-modified polyethylene terephthalate (PET-G) -based film, there is a problem that the flexibility is poor.

Accordingly, it is an object of the present invention to provide a decor sheet capable of vacuum molding and membrane molding while ensuring adequate flexibility.

In order to achieve the above object, the present invention provides a decor sheet comprising a polyolefin-based color film layer, a printing layer, an adhesive layer, a glycol-modified polyethylene terephthalate (PET-G) -based transparent film layer.

The decor sheet may further include a primer layer, and the primer layer may be formed on one or both sides of the colored film layer.

The decor sheet may further include a surface treatment layer.

Preferably, the decor sheet is a primer layer / polyolefin-based colored film layer / primer layer / printing layer / adhesive layer / glycol modified polyethylene terephthalate (PET-G) -based transparent film layer / surface treatment layer, polyolefin-based colored film layer / Primer layer / printing layer / adhesive layer / glycol modified polyethylene terephthalate (PET-G) type transparent film layer / surface treatment layer or primer layer / polyolefin-based color film layer / printing layer / adhesive layer / glycol modified polyethylene terephthalate It has a structure of a (PET-G) -based transparent film layer / surface treatment layer.

Preferably, the thickness of the glycol-modified polyethylene terephthalate (PET-G) transparent film layer is 100 to 400㎛.

The polyolefin-based colored film layer may include polypropylene or polyethylene.

The primer layer may include polyurethane or polyisocyanate.

The print layer may comprise polyurethane or polyvinyl.

The adhesive layer may comprise polyester or polyisocyanate.

The surface treatment layer may include an acrylate or polyurethane.

The decor sheet according to the present invention can implement the effect of ensuring the molding holding force that can be vacuum molding and membrane molding, while ensuring the appropriate flexibility.

Hereinafter, the present invention will be described in more detail.

The decor sheet of the present invention includes a polyolefin-based color film layer, a printing layer, an adhesive layer, a glycol-modified polyethylene terephthalate (PET-G) -based transparent film layer. The decor sheet according to the present invention by using a polyolefin-based colored film layer and a glycol-modified polyethylene terephthalate (PET-G) -based transparent film layer together, the storage modulus is higher than when the decor sheet is composed only of the existing polyolefin-based film Is improved. Thus, as the storage modulus is improved in the decor sheet according to the present invention, membrane molding and vacuum molding are possible. In addition, since the glycol-modified polyethylene terephthalate (PET-G) -based film has a high storage modulus at a low temperature, the molding holding force at room temperature after molding is superior to the case where the decor sheet is composed only of the existing polyolefin-based film.

In addition, since the decor sheet of the present invention includes a polyolefin-based colored film layer, it is more flexible than a decor sheet made of only a glycol-modified polyethylene terephthalate (PET-G) -based film as a colored film layer and / or a transparent film layer. Can be added further.

That is, the decor sheet of the present invention introduces a structure in which a polyolefin-based film and a glycol-modified polyethylene-telephthalate (PET-G) -based film are laminated to form an elastic modulus and a polyolefin-based resin of a glycol-modified polyethylene-telephthalate (PET-G) -based resin. Flexibility You can get both advantages. As a result, the decor sheet according to the present invention has a molding holding force due to the sufficient elastic modulus in the room temperature portion, the elastic modulus is sharply reduced after about 65 ~ 70 ℃, has a moldability.

Deco sheet according to the present invention can be formed by stacking a multi-layered film, in addition to the polyolefin-based color film layer and glycol-modified polyethylene terephthalate (PET-G) -based transparent film layer, the printing layer, adhesive layer, etc. Include. Preferably, it may further include a primer layer, a surface treatment layer and the like. The multi-layered decoration sheet according to the present invention may be further known in the art and may further comprise a layer constituting the multi-layered decoration sheet. More preferably, a primer layer is formed on one side or both sides of the colored film layer.

Preferably, the decor sheet according to the present invention is a primer layer / polyolefin-based colored film layer / primer layer / printing layer / adhesive layer / glycol modified polyethylene terephthalate (PET-G) -based transparent film layer / surface treatment layer, polyolefin-based Colored film layer / primer layer / printing layer / adhesive layer / glycol modified polyethylene terephthalate (PET-G) based transparent film layer / surface treatment layer or primer layer / polyolefin based colored film layer / printed layer / adhesive layer / glycol modified polyethylene It may have a structure of a telephthalate (PET-G) -based transparent film layer / surface treatment layer.

Hereinafter, the respective layers will be described in more detail the role.

The colored film layer serves to add hiding power and provide gas barrier property.

The primer layer is generally formed using a material such as polyurethane or polyisocyanate, and the adhesive layer is generally formed using a material such as polyester or polyisocyanate, and the printing of the printing layer and glycol-modified polyethylene terephthalate (PET -G) serves to improve adhesion with the transparent film layer.

A printing layer is generally formed using materials, such as a polyurethane and polyvinyl, and can give a design, such as a neck pattern / abstract pattern, and can give characteristics of heat resistance, light resistance, and weather resistance.

Glycol modified polyethylene terephthalate (PET-G) resins included in the glycol-modified polyethylene terephthalate (PET-G) -based transparent film layer include terephthalic acid (TPA) and ethylene glycol (EG). ), An amorphous resin copolymerized with cyclohexanedimethanol (CHDM), with excellent processability, formability and printability, no deformation due to shrinkage, impact resistance, and chlorine gas generated during incineration or fire. It is suitable as a resin for film layers contained in the decor sheet according to the present invention, since it has a characteristic of having no harmful components such as environmental hormones.

The glycol-modified polyethylene terephthalate (PET-G) -based transparent film layer comprising such a glycol-modified polyethylene terephthalate (PET-G) resin is intended to protect the lower printed layer and may also impart light resistance and weather resistance and provide gas. Block it.

The surface treatment layer is generally formed using a material such as acrylate, and laminated in order to impart stain resistance, scratch resistance, light resistance, weather resistance, and the like.

In the decor sheet of the present invention, preferably, the thickness of the polyolefin-based colored film layer is about 40 to about 250 mu m. When the thickness of the polyolefin-based colored film layer is less than 40 μm, there is a problem in that the appearance effect is lowered due to a decrease in printability and lack of hiding power, and when it exceeds 250 μm, there is a problem in that productivity is reduced due to a speed decrease during gravure printing.

Preferably, the thickness of the primer layer is about 3 to about 10 mu m. When the thickness of the primer layer is less than 3㎛, the adhesive force with the upper transparent film layer may be weak, if the thickness exceeds 10㎛ the working speed may be lowered.

Preferably, the thickness of the printed layer is about 3 to about 10 μm. If the thickness of the printed layer is less than 3㎛, there is a problem that can not express a variety of patterns, if it exceeds 10㎛ there is a problem that the work speed is lowered due to lack of drying of the printed layer.

Preferably, the thickness of the adhesive layer is about 3 to about 8 μm. When the thickness of the adhesive layer is less than 3㎛, there is a problem in that the adhesive strength of the polyolefin-based colored film layer and the transparent film layer tube is weak, if it exceeds 8㎛ there is a problem of lowering the working speed.

Preferably, the thickness of the glycol-modified polyethylene terephthalate (PET-G) -based transparent film layer is about 100 to about 400㎛. When the thickness of the glycol-modified polyethylene terephthalate (PET-G) -based transparent film layer is less than 100㎛, there is a problem of low temperature elastic modulus during membrane molding and vacuum molding, if the thickness exceeds 400㎛ and the processing temperature rise during membrane molding operation and There is a problem that the workability is degraded.

Preferably, the thickness of the surface treatment layer is about 3 to about 10 mu m. When the thickness of the surface treatment layer is less than 3㎛, there is a problem that the surface glossiness change and contamination resistance of the transparent glycol polyethylene terephthalate layer during membrane molding and vacuum molding is reduced, and when the surface treatment layer exceeds 10㎛, the speed decrease and There is a problem that the crack occurs in the surface treatment layer when forming the membrane.

The decor sheet of the present invention is suitable for thermoforming, in particular for vacuum forming. Thermoforming is a method of heating / softening a thermoplastic resin sheet or film and making a shape by vacuum or press. The term thermoforming is used in a broad sense including various sheet processing techniques such as vacuum forming, pressure forming, matched mold forming and combinations thereof. Common thermoforming processes consist of feeding, clamping, heating, shaping, cooling and trimming. When the sheet obtained mainly by extrusion or the like is fed to a molding machine, it is completely clamped to the mold, and heated to a molding temperature, followed by shaping by heating or vacuum. When the molding is completed, the molded product is obtained through appropriate cooling and trimming processes.

Thermoforming is performed at a relatively low pressure (typically 1-10 atmospheres) compared to other competitive methods such as blow molding, injection molding and injection blow molding. It is possible to use a mold of cheap material, which is somewhat inferior in strength, and thus can be molded at a minimum cost even in a large volume. In addition, parts with extremely thin sidewalls or sufficiently low thickness-to-area ratios have extremely short molding time and can efficiently mass-produce a large amount of parts, resulting in high molding satisfaction that is unlikely to be expected by other molding methods. There is an advantage that it can.

In addition, the decor sheet of the present invention is particularly suitable for membrane molding. Membrane forming is a combination of press forming and vacuum forming. After heating, pressure forming and vacuum forming occur simultaneously.

Hereinafter, with reference to the accompanying drawings to illustrate a multi-layered decoration sheet according to the present invention will be described in more detail. It is only intended to more clearly understand the present invention and is not intended to limit the scope of the present invention.

1 is a cross-sectional view of a decorative sheet according to an embodiment of the present invention. The decor sheet of Figure 1 has a structure of a primer layer / polyolefin-based color film layer / primer layer / printing layer / adhesive layer / glycol modified polyethylene terephthalate (PET-G) -based transparent film layer / surface treatment layer. A primer layer is formed on each of the upper and lower portions of the polyolefin colored film layer, and the upper primer layer is a layer for improving adhesion between the colored film layer and the printing layer, and the lower primer layer is a multilayer structure decorative sheet of the present invention. When adhering to the adherend (MDF, PB, PVC, PP, etc.), it serves to increase the adhesive force between the adherend and the decor sheet. In fact, in the absence of the upper primer layer, a phenomenon may occur in which the glycol-modified polyethylene terephthalate (PET-G) transparent film layer and the polyolefin colored film layer are peeled off in use. In the absence of the lower primer layer, peeling with the adherend may occur.

Hereinafter, the structure and effects of the present invention will be described in more detail with specific examples and comparative examples, but these examples are only intended to more clearly understand the present invention and are not intended to limit the scope of the present invention.

Example  One

First, polypropylene and polyethylene were used as raw materials, and a composition for a colored film layer containing an antioxidant, an ultraviolet stabilizer, and a pigment was prepared as an additive. For the composition, kneading was carried out using a twin screw extruder (45 mm diameter) set at 230 ° C. to prepare pellets for the resin composition. The colored film layer was shape | molded the pellet of each obtained resin composition through the calender shaping | molding apparatus.

On the other hand, 2 parts by weight of the coating film forming agent, 18 parts by weight of a mixed solvent of methyl ethyl ketone and toluene were mixed with 100 parts by weight of the polyurethane copolymer to obtain a primer composition. Separately, 100 parts by weight of a hexamethylene diisocyanate (HMDI) as a curing agent was mixed with 100 parts by weight of a mixture of xylene, methyl ethyl ketone and butyl acetate as a solvent to prepare a curing agent composition. Immediately before applying to the colored film layer as the adherend, the primer composition and the curing agent composition were mixed at 100: 5 to obtain a primer treatment composition. Gravure knife coating the primer treatment composition at a coating speed of 30 m / min below the colored film as an adherend, and dried to form a surface treatment film to a thickness of 5㎛. The same primer layer as the primer is formed on the colored film upper layer. 50 parts by weight of a vinyl copolymer, 50 parts by weight of a vinyl copolymer, 5-15 parts by weight of a pigment for coloration, methyl ethyl ketone as a diluent, and an IPA mixed solvent 18 weight part was mixed and the ink composition was obtained. The ink composition was formed through gravure printing on the colored film on which the primer layer, which is an adherend, was formed. In order to form an adhesive layer on the printed layer again, 40 parts by weight of an ethyl acetate (EA) mixed solvent as a diluent was mixed with 100 parts by weight of a polyester copolymer to obtain an adhesive composition.

Separately, 100 weight part of polyisocyanate which is a hardening | curing agent was mixed at 100: 5, and the adhesive composition was obtained just before apply | coating to a to-be-adhered body. A gravure knife coating of the adhesive treatment composition on the print layer, which is an adherend, at a coating speed of 30 m / min, and dried to form a surface treatment film having a thickness of 5 μm.

Meanwhile, glycol modified polyethylene terephthalate (PET-G) resin is obtained by copolymerizing terephthalic acid (TPA), ethylene glycol (EG), and cyclohexanedimethanol (CHDM). Pellets of the resin composition are melt-extruded, and the melt-extruded glycol modified polyethylene terephthalate (PET-G) is manufactured by molding a sheet using a cold casting roll. In the melt extrusion may be carried out by a conventional method consisting of a melt extruder, T-DIE and casting (CASTING), the melt extruder (single screw extruder or twin screw extruder) Any of these may be used

Glycol modified polyethylene terephthalate (PET-G) thus formed is laminated with the adhesive having the adhesive composition formed thereon at a speed of 30 m / min.

After embossing the whole sheet, 40 weight part of methyl ethyl ketones which are diluents were mixed with 100 weight part of polyacrylate copolymers, and the surface treatment composition was obtained. Separately, 100 parts by weight of the curing agent hexamethylene diisocyanate (HMDI) was mixed with 100 parts by weight of the total weight of the solvents xylene, methyl ethyl ketone and butyl acetate to prepare a curing agent composition. The surface treating agent composition and the curing agent composition were mixed at 100: 5 to obtain a surface treating agent composition. A gravure knife coating of the surface treatment composition on the transparent film layer, which is an adherend, at a coating speed of 20 m / min, and dried to form a surface treatment film having a thickness of 5 μm. Deco sheet cross section of the final result was formed as shown in FIG.

Comparative example  One

Deco film was manufactured in the same structure as in Example 1 except that the transparent film was formed using a polyolefin resin.

Comparative example  2

The colored film layer was formed using a polyvinyl chloride-based resin, and the decorate film was manufactured in the same structure as in Example 1 except that the transparent film was formed using the polyvinyl chloride-based resin.

Comparative example  3

The colored film layer was formed using PET-G, and the decor film was manufactured in the same structure as in Example 1 except that the transparent film was formed using PET-G.

(Evaluation of storage modulus)

Storage elastic modulus was measured for the decor sheet prepared in Example 1, Comparative Examples 1 to 3 using Universal V4.2E TA Instruments (manufactured by TA Instruments).

FIG. 2 is a graph showing measured data with respect to temperature in the case of Comparative Example 1 which is a decor sheet composed of an olefinic film. As shown in FIG. 2, the decor sheet of Comparative Example 1 has a constant decrease in storage modulus as the temperature increases from low temperature to high temperature. In this case, membrane molding and vacuum molding are impossible. In addition, as shown in Figure 2, it can be seen that the decorative sheet composed of the olefin-based film of Comparative Example 1 has a low storage modulus at low temperature, it can not have the desired molding holding force during molding.

3 shows a relatively high storage modulus of elasticity from about 75 ° C. after the decorative sheet of Example 1, and drops rapidly from about 75 ° C. to about 85 ° C. FIG. The change behavior of storage modulus according to the temperature of the decor sheet of Example 1 is suitable for membrane forming and vacuum forming. That is, membrane molding and vacuum molding are possible at the temperature of about 75 ° C to about 85 ° C. The rapid storage modulus drop in the range of molding temperature (about 75 ℃ to about 85 ℃) to minimize the restoring force after molding to maintain a constant shape after membrane molding and vacuum molding. In addition, the decoration sheet of Example 1 has a high storage modulus even at low temperatures, as shown in Figure 3, when the return to room temperature after molding the product at a high temperature, by maintaining a high elastic modulus again, it is possible to maintain the shape of the product have.

4 shows the case of Example 1, Comparative Example 2 and Comparative Example 3 in one graph for comparison.

Deco sheet according to the present invention can implement the effect of ensuring the molding holding force that can be capable of vacuum molding and membrane molding, while ensuring the appropriate flexibility.

Claims (10)

Deco sheet comprising a polyolefin-based color film layer, a printing layer, an adhesive layer, a glycol-modified polyethylene terephthalate (PET-G) transparent film layer, the thickness of the glycol-modified polyethylene terephthalate (PET-G) transparent film layer Deco sheet, characterized in that 100 to 400㎛. The decor sheet of claim 1, further comprising a primer layer formed on one or both surfaces of the colored film layer. The decor sheet of claim 1, further comprising a surface treatment layer. The method of claim 1, wherein the decor sheet is a primer layer / polyolefin-based colored film layer / primer layer / printing layer / adhesive layer / glycol modified polyethylene terephthalate (PET-G) -based transparent film layer / surface treatment layer, polyolefin-based colored Film layer / primer layer / printing layer / adhesive layer / glycol modified polyethylene terephthalate (PET-G) based transparent film layer / surface treatment layer or primer layer / polyolefin based colored film layer / printed layer / adhesive layer / glycol modified polyethylene tele Deco sheet, characterized in that it has any one of a structure of a phthalate (PET-G) transparent film layer / surface treatment layer. delete The decor sheet according to any one of claims 1 to 4, wherein the polyolefin-based color film layer comprises polypropylene or polyethylene. The decor sheet according to claim 2 or 4, wherein the primer layer comprises polyurethane or polyisocyanate. The decor sheet according to any one of claims 1 to 4, wherein the printed layer comprises polyurethane or polyvinyl. The decor sheet according to any one of claims 1 to 4, wherein the adhesive layer comprises polyester or polyisocyanate. The decor sheet according to claim 3 or 4, wherein the surface treatment layer comprises acrylate or polyurethane.

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