KR20130045591A - High-glossy decorative sheet having improved flexural modulus and scratch resistance - Google Patents

Abstract

The high gloss decoration sheet according to the present invention is to form a pattern using a soft UV curable resin and to form a hard UV cured coating layer thereon provides a deco sheet excellent in both scratch resistance and bending processability.

Description

High-glossy decorative sheet having improved flexural modulus and scratch resistance

The present invention relates to a high gloss decorative sheet and a method for manufacturing the same, and more specifically, using an environmentally friendly UV coating material, forming a multi-layer UV coating layer containing a pattern excellent in scratch resistance and bending processing and its manufacturing It is about a method.

In general, furniture and interior finishes or interior materials of buildings are manufactured using vinyl chloride resin (PVC), polyolefin resin, or polyester resin, which is generally photocured in the case of high gloss products having improved surface transparency and scratch resistance. It is prepared by UV curing using a resin.

For example, a method of manufacturing interior sheets using UV hard coatings and UV curable adhesives has been filed (Application No. 10-2009-0054263), and an environmentally friendly polypropylene film (Application No. 10-2005-0087789) and a polyester film ( Patent No. 10-2007-0054644) has been applied for a technique for producing an environmentally friendly interior sheet with a surface strength by applying a UV curing coating. A technique for applying a pattern to a surface using a UV curable material has also been announced (Application No. 10-2008-0013828). In this case, a pattern is formed on the surface of the UV cured layer using a third film already formed with a pattern. That's the way it is.

However, the techniques disclosed in the related art improve the strength of the surface to provide the scratch resistance and the function of improving the transparency of the surface, but the hardness of the UV cured layer is so large that it does not realize the flexibility of PVC, PP or PET film. There is a disadvantage that the flexibility is too low.

In order to improve this, the modified polyethylene-based resin is used in the upper layer to improve wear resistance, scratch resistance, and stain resistance. The mixed resin of polyurethane resin and modified polyethylene resin is used in the middle layer to improve tensile strength and bending processability. Although a manufacturing method has been reported for a top layer film for eco-friendly decor sheet that can be thermally fused using a mixed resin of urethane and ethylene vinyl acetate resin (application number 10-2005-0043774, registration number 10-0622894), transparency and scratch resistance It is disadvantageous that the cost is lowered than that using the UV curable resin and the manufacturing cost is increased due to the use of three layers of materials.

An object of the present invention is to provide a decor sheet having excellent hardness and surface bending strength by forming a multi-layer UV curable resin layer of different hardness.

In order to solve the above technical problem, the present invention is a hard UV cured layer, a soft UV cured layer and a deco film layer laminated in succession, the hard UV cured layer has a pencil hardness of 2H or more, the soft One UV cured layer provides a high gloss decor sheet characterized by a pencil hardness of HB or less.

According to one embodiment of the present invention, a pressure sensitive adhesive (PSA) layer may be further included between the decor film and the soft UV cured layer, and the usable pressure sensitive adhesive may be a solvent type, a hot melt type, an aqueous type, and a sight. Any type of pressure-sensitive adhesive, such as fire, may be used, and the type of pressure-sensitive adhesive may be selected from acrylic pressure-sensitive adhesives, rubber pressure-sensitive adhesives, epoxy pressure-sensitive adhesives, or mixtures thereof, but is not limited thereto.

According to one embodiment of the present invention, the hard UV cured layer may be selected from resins based on epoxy acrylate and polyester acrylate oligomer, but is not limited thereto.

In addition, according to one embodiment of the present invention, the soft UV cured layer may be selected from a resin containing a urethane acrylate oligomer as a main component, but is not limited thereto.

In addition, according to another embodiment of the present invention, the soft UV cured layer is preferably formed with a pattern, for example, the pattern may be selected from prism, stripe, lenticular, or dot form.

The high gloss decoration sheet according to the present invention is to form a pattern by using a soft UV curable resin and to form a hard UV cured coating layer thereon to provide a deco sheet excellent in both scratch resistance and bending workability, conventional UV It can be easily manufactured using the coating equipment has the advantage that the manufacturing cost is not high. In addition, when the pressure-sensitive adhesive layer is formed on the back of the UV coating layer, it can be easily attached to any material, which is wide and useful.

1 is a cross-sectional view when a UV coating layer having a prism pattern according to an embodiment of the present invention is directly formed on a decor sheet.
2 is a cross-sectional view when the UV coating layer having a prism pattern according to an embodiment of the present invention is combined with a decor sheet through a pressure-sensitive adhesive.
DESCRIPTION OF THE REFERENCE SYMBOLS
1: hard UV coating layer 2: soft UV coating layer
3: decoration sheet 4: adhesive layer

Hereinafter, the present invention will be described in detail.

The present invention relates to a high gloss decoration sheet, characterized by manufacturing a product having excellent surface strength and bending property by combining UV multi-layer coating and UV pattern technology.

In general, the surface hardness is not limited by the specific resin composition because it depends on the type of diluent, the type of initiator, the curing time and the degree of curing, but generally the hardness tends to be inferior in bending processability. After all, the present invention utilizes a multi-coating technology including a pattern form to produce a high gloss decoration sheet excellent in both hardness and bendability.

Specifically, the high gloss decoration sheet according to the present invention is laminated UV cured layer, soft UV cured layer and deco film layer, the hard UV cured layer is a pencil hardness of 2H or more, soft UV cured layer is a pencil hardness It is characterized by being less than HB.

According to one embodiment of the present invention, the hard UV curing layer may be selected from resins based on epoxy acrylate and polyester acrylate oligomer, but is not limited thereto.

In addition, according to one embodiment of the present invention, the soft UV cured layer may be selected from a resin containing a urethane acrylate oligomer as a main component, but is not limited thereto.

The UV coating layer is formed on a conventional decor film, which is not particularly limited as a sheet on which various patterns or patterns are printed on polyvinyl chloride, polyolefin and polyester-based sheets.

The UV cured layer is formed by coating a liquid coating liquid consisting of a UV curable oligomer, a monomer and an initiator in a conventional manner, and then irradiating ultraviolet light to initiate the reaction to cure in a short time. Epoxy acrylate, urethane acrylate and polyester acrylate are used as reactive oligomers. Epoxy acrylate and polyester acrylate have high tensile strength due to high glass transition temperature. And it has a surface hardness but the elongation has a disadvantage in that the formability of the final sheet is inferior. On the other hand, in the case of urethane acrylate, the elongation is relatively high due to the low glass transition temperature, but the mechanical properties such as surface hardness and tensile strength are poor.

These oligomers are generally difficult to use due to their high viscosity, so that reactive monomers are used to lower the viscosity. In some cases, the viscosity is controlled by using a solvent. However, since there are environmental problems and limitations in realizing properties, recently, a UV coating liquid having a solid content of 100% by using a monomer is mainly used. The monomers are classified according to the number of acrylates. In general, there are 1 to 6 acrylates. Reactive monomers are classified into monofunctional, difunctional, trifunctional and multifunctional monomers according to the number of reactors. For monofunctional monomers, 2-EHA (ethtlhexyl acrylate), ODA (Octyl decyl acrylate), 2-HEA (Hydroxyethyl acrylate), etc. Bifunctional monomers include BDDA (Butanediol), NPGDA (Neopentyl Glycol Diacrylate), and EGDMA (Ethylene Glycol Dimethylacrylate). There is this.

The final properties of the UV cured film depend on the type and compounding ratio of the oligomers and monomers. In general, when the hard monomer or oligomer having a high glass transition temperature is used and the crosslinking degree of these oligomers and monomers is increased, the elongation is increased. Is reduced, and moldability is significantly reduced. Therefore, the surface hardness and elongation are adjusted by appropriately adjusting the amount of hard oligomer / monomer and soft oligomer / monomer according to the use of the final product, that is, limiting the simultaneous increase of surface hardness and elongation by changing the composition of oligomer or monomer. There is. We tried to solve the problem by applying soft UV coating on the decor sheet and hard UV coating on it, but the soft coating layer on the lower layer reduces the surface hardness of the hard coating layer on the upper layer, and thus has no great effect.

Accordingly, the present inventors utilize a UV patterning technology to utilize a soft UV curable resin to form a pattern layer such as a prism and lenticura, and when the hard UV curable resin is coated thereon, the surface strength is improved. At the same time, it has been found that a deco sheet film having excellent bendability can be obtained. In this case, the soft UV cured layer in the lower layer has a large contact area with the decor sheet, which increases the adhesive strength with the decor sheet, which is advantageous for increasing the elongation of the entire sheet. The hard UV coating layer in the upper layer is between the soft UV coating layers. It is located and has the effect of covering the surface as a whole improves the scratch resistance of the entire sheet.

In addition, the pattern of the soft UV coating layer according to the present invention is possible without limitation as long as it is a three-dimensional shape, it is usually selected from prism, stripe, lenticular, or dot form. In the case of a pattern, a pattern of various forms can be formed using the pattern roll like a conventional method.

In addition, the UV coatings may be formed by directly coating the decor sheet, or may be combined with the decor sheet of the lower layer by a pressure sensitive adhesive (PSA). In this case, a pressure-sensitive adhesive (PSA) layer may be further included between the decor film and the soft UV cured layer. The pressure sensitive adhesive that can be used may be any type of pressure sensitive adhesive such as solvent type, hot melt type, water based type, and photocurable type. Examples of the type of adhesive include acrylic pressure sensitive adhesive, rubber pressure sensitive adhesive, epoxy pressure sensitive adhesive, and the like. have. .

1 is a cross-sectional view when a UV coating layer having a prism pattern according to an embodiment of the present invention is directly formed on a decor sheet. 2 is a cross-sectional view when the UV coating layer having a prism pattern according to an embodiment of the present invention is combined with a decor sheet through a pressure-sensitive adhesive.

Through the following examples will be described in more detail the present invention. The present embodiment is for illustrative purposes only, and the scope of the present invention is not limited to these examples.

Example  One

First, 30g of TPGDA monomer (Tripropylene Glycol Diacrylate) was added as a diluent to 100g of UV-curable resin (Aekyung Chemical, RS-1658) with a pencil hardness of F in order to produce a soft UV-curable resin, and mixed at room temperature for 1 hour. A soft UV curable resin in which B was prepared.

The soft UV-curable resin prepared above was directly coated onto an oak-colored PVC decorative sheet, and then, a mercury lamp was used for photocuring to form a soft UV-cured layer having a thickness of 10 μm. At this time, the UV irradiation amount was adjusted to 800 mJ / cm ² . At the time of UV curable resin coating, a pattern roll was used to form a pattern layer in the form of a prism. At this time, the prism had a height of 10 μm and an area of 1 mm ² .

The coating layer was directly coated using a hard UV curable resin (Aekyung Chemical, RS-1657) having a pencil hardness of 2H to fill the liquid between prisms, and then cured using a mercury lamp to complete the multi-coating layer.

Example  2

Example 1 except that after forming the UV multi-coating layer on the release paper, the release paper was removed and the backing was coated with a pressure sensitive adhesive (PSA) (trade name GMS 3127 of Cytec, USA), followed by laminating the decor sheet. Is the same as At this time, the thickness of the PSA coating layer was adjusted to be 15 ㎛.

Comparative example  One

It is the same as Example 1 except the hard UV hardened layer was formed on the soft UV hardened layer without a pattern. At this time, the thickness of each layer was adjusted to be 5 ㎛ each.

Comparative example  2

It is the same as Example 1 except using only the soft UV curable resin, and forming the single-coating layer of thickness 10micrometer.

Comparative example  3

It is the same as Example 1 except only using a hard UV curable resin to form a single coating layer having a thickness of 10 ㎛.

Comparative example  4

The soft UV curable resin and the hard UV curable resin were mixed in a weight ratio of 1: 1 for 30 minutes, and then the same as in Example 1 except that a single coating layer having a thickness of 10 μm was formed using the mixed resin.

Comparative example  5

It is the same as Example 1 except not using UV-curable resin and laminating using PVC transparent sheet.

Evaluation example

The surface gloss, scratch resistance and V-cutting and bending workability of the sheet according to the Examples and Comparative Examples were evaluated based on the following evaluation method, and the results are shown in Table 1.

[Assessment Methods]

1. Surface glossiness

The high gloss decoration sheet was placed on black paper, and a 1m fluorescent lamp was installed to classify the film into three grades by observing the glossiness of the film.

○: The surface is smooth and the film finish is constant

Δ: surface is somewhat smooth but unstable

×: almost no surface gloss and poor thickness

2. Scratch resistance

After the scratch test (1kg load, 10 round trips) for # 000 steel wool, the results were classified into 3 grades.

○: No surface damage

Δ: slight surface damage

X: much surface damage

3. Pencil Hardness

After fixing the slope of the high gloss deco sheet to the glass plate and treated with sandpaper parallel to the tip of Mitsubishi pencil, 500kgf, scraped at an angle of 45 degrees to determine the hardness value.

4. V-shaped cutting and bending workability

After forming the V-shaped cutting groove on the upper surface of the high-gloss decoration sheet, check whether it is possible to restore the original flat state by bending and unfolding, and if it is bent without cutting grooves, observe the degree of discoloration of the bent portion and classify it into 3 grades. Classified by.

○: When the V-shaped cutting groove is formed, it is bent and straightened. If there is no cutting groove, there is no discoloration of the bent portion.

Δ: When the V-shaped cutting groove is formed, it is bent and unfolded, but when there is no cutting groove, the discoloration of the bent portion is somewhat observed.

X: When the V-shaped cutting groove is formed, it is not bent and unfolded. If there is no cutting groove, the bent portion discolors to white.

-S: soft UV resin

-H: hard UV resin

-S / H: Soft / hard UV resin 1: 1 mixed resin

As can be seen in the above Examples and Comparative Examples, scratch-resistant when first forming a soft first UV cured layer having a prism shape using a pattern roll and then forming a hard second UV cured layer thereon It can be seen that both performance and bending workability are excellent. In the case of simply forming a two-layer UV coating layer without a pattern (Comparative Example 1), the bending workability is excellent, but the surface hardness decreases under the influence of the soft layer of the lower layer, indicating that the scratch resistance is poor. In addition, when the two resins were mixed to form a single UV coating layer (Comparative Example 4), it can be seen that the bending property and the scratch resistance had respective average level.

Claims (5)

A high gloss decorative sheet in which a hard UV cured layer, a soft UV cured layer, and a decor film layer are sequentially stacked,
The hard UV cured layer has a hardness of 2H or more,
The soft UV cured layer is a high gloss decoration sheet, characterized in that the hardness is less than HB. The method of claim 1,
A high gloss decoration sheet further comprising a pressure-sensitive adhesive (PSA) layer between the decor film and the soft UV cured layer. The method of claim 1,
The pressure-sensitive adhesive is a type of high gloss decoration sheet, characterized in that the solvent type, hot melt type, aqueous type, and photocurable type, the type is selected from acrylic pressure-sensitive adhesive, rubber pressure-sensitive adhesive, epoxy pressure-sensitive adhesive, or a mixture thereof. The method of claim 1,
The soft UV cured layer is a high gloss decoration sheet characterized in that the pattern is formed. 5. The method of claim 4,
The pattern is a high gloss decoration sheet, characterized in that selected from among the prism, stripe, lenticular, or dot form.

Images