KR20120064497A - Deco-sheet - Google Patents

Abstract

PURPOSE: A decorative sheet is provided to comprise PET-G(Glycol modified polyethylene terephthalate) and PBT(polybutylene terephthalate), thereby obtaining flexibility, thereby providing a decorative sheet capable of being 3-diemnsional membrane molded. CONSTITUTION: A decorative sheet comprises a hard coating layer(140), a first skin layer(120), a base layer(110), and a second skin layer(130) laminated in order. The base layer comprises PET-A. the first skin layer and second skin layer comprises PET-G and PBT. The molar mixing ratio of the PET-G and PBT is 5.5:4.5-7:3. The first skin layer and the second skin layer additionally comprises PCTG. The molar mixing ratio of the PET-G, PBT and PCTG is 5:4:1-6:3:1. Pigment thereof is one of Pigment Yellow and Pigment Blue. The thickness of the first skin layer, the base layer, and the second skin layer is 200-400 μm. The hard coating layer is based on an acrylate copolymer. The thickness of the hard coating layer is 3-10 μm. The decorative sheet is manufactured by membrane-molding.

Description

Deco-Sheet {Deco-sheet}

The present invention relates to a decor sheet, and more particularly, to a decor sheet having excellent flexibility and scratch resistance and stain resistance.

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

Conventionally, decor sheets have been used using polyvinyl chloride resins and combustible polypropylene resins. However, polyvinyl chloride material is excellent in physical properties and formability, but it is inferior in durability and emits a large amount of toxic gas when incinerated, which is classified as an environmentally harmful substance. There was a problem.

In addition, polyolefin-based resins have been used as a material for replacing them, which is difficult to mold and has a poor appearance quality. The olefin resin has excellent heat resistance and mechanical strength, excellent chemical resistance, electrical insulation, and the like, and is widely used in plastic films and sheets for non-toxicity. However, due to the inherent adhesive properties, the olefinic resin may stick to the roll surface during processing of a calender, and in particular, when ductility is imparted, such as polyvinyl chloride molded article for decor sheet, the adhesion becomes more difficult and molding is difficult. The surface and appearance quality of the product is also degraded. In addition, due to the inherent elastic modulus of the olefin-based film there is a problem that the membrane molding is impossible.

Korean Patent Publication Nos. 2002-0011290 and 2002-0011289 disclose a decorating sheet composition capable of calendering by mixing inorganic fillers, antiblocking agents, lubricants and stabilizers with polypropylene and polyethylene resins, but in this case, Using an inorganic filler, the compatibility with the base (Base Resin) is lowered, the mechanical properties of the decor sheet when molding into a product, there is a problem such as poor durability and flammable burning in combustion. In addition, there is a problem of membrane molding due to the high Tg temperature, which is an inherent physical property.

Accordingly, there is a demand for the development of a decor sheet capable of forming a membrane while the decor sheet secures high flexibility, scratch resistance, and contamination resistance.

In order to solve the above problems, an object of the present invention is to provide a decor sheet capable of forming a membrane while maintaining a suitable flexibility.

Another object of the present invention is to provide an environmentally friendly decor sheet excellent in pollution resistance.

In order to achieve the above object, the present invention, in the decor sheet, the hard coating layer, the first skin layer, the base layer and the second skin layer are sequentially stacked from above, the base layer is composed of PET-A, the first skin layer and The second skin layer provides a decor sheet characterized in that PET-G and PBT are mixed.

In another aspect, the present invention provides a decor sheet characterized in that the mixing ratio of the PET-G and PBT is 5.5: 4.5 to 7: 3.

In the present invention, the first skin layer and the second skin layer is PCTG is further mixed, the mixing ratio of PET-G, PBT and PCTG is 5: 4: 1 to 6: 3: 1 molar ratio Provide a sheet.

The present invention also provides a decor sheet characterized in that the pigment using any one of TiO ₂ , Pigment Yellow and Pigment Blue.

In another aspect, the present invention provides a decor sheet, characterized in that the thickness of the first skin layer, the base layer and the second skin layer is 200 to 400㎛.

In another aspect, the present invention provides a decor sheet characterized in that the hard coating layer is a urethane-based acrylate copolymer series.

In another aspect, the present invention provides a decorative sheet, characterized in that the thickness of the hard coating layer is 3 to 10㎛.

In another aspect, the present invention provides a decorative sheet characterized in that it further comprises a protective film layer on the top surface of the hard coating layer.

In another aspect, the present invention provides a decor sheet characterized in that the decor sheet is produced by membrane molding.

Decor sheet according to the present invention has an excellent elongation and high flexibility has the effect that the edges and curved portions are formed smoothly.

In addition, the decor sheet according to the present invention is excellent in scratch resistance of the surface, there is an effect excellent in fouling resistance.

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

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that, in the drawings, the same components or parts have the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

The terms " about ", " substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation to or in the numerical value of the manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

In the present invention, in the decor sheet, the hard coating layer, the first skin layer, the base layer and the second skin layer are sequentially stacked from above, the base layer is composed of PET-A, the first skin layer and the second skin layer is PET -G and PBT are mixed.

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

The decor sheet is composed of a hard coating layer 140, the first skin layer 120, the base layer 110 and the second skin layer 130.

The base layer 110 according to the embodiment of the present invention is composed of amorphous polyethylene terephthalate (PET-A). Since the base layer 110 is made of PET-A, the base layer 110 may be maintained to have excellent thermal stability and transparency.

In addition, the first skin layer 120 and the second skin layer 130 are composed of glycol-modified polyethylene terephthalate (PET-G) and polybutylene terephthalate (PBT).

Glycol modified polyethylene terephthalate (PET-G) resin included in the glycol-modified polyethylene terephthalate (PET-G) is a terephthalic acid (TPA) and ethylene glycol (Ethylene glycol: EG), cyclo It is an amorphous resin copolymerized with hexane dimethanol (CDM), which has excellent processability, moldability and printability, no deformation due to shrinkage, impact resistance, and no chlorine gas in incineration or fire. It is suitable as a material contained in the decor sheet according to the present invention because it has a characteristic free from harmful components such as the like.

The polybutylene terephthalate (PBT) has a property of improving solvent resistance and flexibility when forming a skin layer as a crystalline polymer. That is, there is an effect that the hard coating liquid does not penetrate into the first skin layer 120 when the hard coating layer 140 and the coating. In addition, the solvent resistance is good and this has the advantage that the skin layer is not damaged and the elongation is increased. In addition, the PBT is mixed with the skin layer to lower the molding temperature, thereby increasing high elongation, and improving white turbidity in the decor sheet.

In addition, the PBT used in the present invention preferably has an intrinsic viscosity (IV) of 0.8 to 0.9 dl / g. Mixing with PET-G within the above range is well made and the solvent resistance is good, thereby increasing the elongation without damaging the substrate.

As the first skin layer 120 and the second skin layer 130 are mixed with the PET-G and PBT, the decor sheet of the present invention is ensured flexibility, and thus three-dimensional membrane molding is possible.

In addition, the first skin layer 120 and the second skin layer 130 is preferably polyethylene terephthalate (PET-G) and polybutylene terephthalate (PBT) is mixed in a molar ratio of 5.5: 4.5 to 7: 3, 6: More preferably, it consists of a molar ratio of four. When mixed in the above range Tg for the mixture of PET-G and PBT is lowered, there is an advantage that can be processed at a low temperature during the post-process.

Meanwhile, the first skin layer 120 and the second skin layer 130 may further include PCTG (poly (cyclohexylene dimethylene terephthalate), glycol). In order to mix the PET-G and PBT well, the PCTG may be mixed at the time of mixing to form the first skin layer 120 and the second skin layer 130. The mixing ratio of PCTG to the first skin layer 120 and the second skin layer 130 is preferably PET-G, PBT and PCTG in a 5: 4: 1 to 6: 3: 1 molar ratio. In the above range, the materials are mixed well, and the Tg is lowered, so that the processing is possible even at a low temperature during the post process.

In addition, one or more layers of the first skin layer, the base layer, and the second skin layer may include a pigment, and the pigment may be any one of TiO ₂ , Pigment Yellow, and Pigment Blue.

In addition, the thickness of the three layers of the first skin layer, the base layer and the second skin layer is preferably about 200 to 400㎛. If the thickness of the three layers is less than 200㎛ problem occurs easily when forming the membrane, if the thickness exceeds 400㎛ there is a problem that the processing temperature rise and workability is lowered when forming the membrane.

On the other hand, the first skin layer 120 includes a hard coating layer 140, the hard coating layer 140 may be subjected to a heat-drying hard coating. In the case of the conventional UV curing method, unreacted monomers may remain during the reaction, and cracks are easily generated during the subsequent molding, and thus, membrane molding is impossible. However, the heat-drying hard coating has an advantage of good molding processability even after curing as compared with the UV curing method. The hard coating layer 140 is preferably a urethane-based acrylate copolymer series.

The urethane acrylate copolymer-based hard coating resin is a resin prepared by copolymerization of an acryl-based monomer having a hydroxy group, a urethane-based polyol and an isocyanate, polyether polyol, polyester polyol, polycaprolactone polyol, polybaconate polyol Polyol components such as polybutadiene polyol, aromatic isocyanates such as toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI) or isophorone diisocyanate (IPDI; Isophorone diisocyanate), hexamethylene diisocyanate Aliphatic isocyanates such as (HMDI; Hexamethylene diisocyanate) can be reacted to select an appropriate raw material having elasticity capable of three-dimensional molding and scratch resistance that can withstand external stimuli.

In addition, the thickness of the hard coating layer 140 is preferably about 3 to 10㎛. When the thickness of the hard coating layer 140 is less than 5㎛ may cause a change in the surface gloss of the first skin layer 120 when forming the membrane, there is a problem that the fouling resistance is lowered, if the thickness exceeds 10㎛ and the speed during the surface treatment operation is lowered Cracking may occur in the hard coat layer 140 during membrane formation.

In addition, the upper surface of the hard coating layer 140 may further include a protective film layer to protect the decor sheet (not shown). The material of the protective film layer is not particularly limited, and may be made of transparent PP, PC and PE. The protective film preferably has a thickness of about 5 to 10 μm.

The decor sheet of the present invention is suitable for thermoforming. Thermoforming is a method of forming a shape by heating / softening a sheet of thermoplastic resin and performing a vacuum or a press. The term thermoforming is used in its broadest sense, including various sheet processing techniques, such as vacuum forming, pressure forming, matched mold forming, and combinations thereof. The thermoforming process is in the order 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.

The thermoforming is performed at a pressure of about 1 to 10 atm lower than other competitive methods such as injection molding, blow molding and injection blow molding. Since it is possible to use a mold of a cheap material having a somewhat low strength, it 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 suitable for membrane molding. Membrane forming is a combination of press forming and vacuum forming. Press heating and vacuum forming occur simultaneously after heating.

Deco sheet according to the present invention has the advantage of high flexibility and the edge and curved portion is formed smoothly and excellent elongation, the surface is excellent in scratch resistance, and also excellent in stain resistance.

Hereinafter, embodiments of the present invention will be described in detail.

Example  One

The base layer PET-A was formed by mixing PET-G and PBT in a molar ratio of 6: 4 as the first skin layer and the second skin layer, and the thickness of the base layer was 300 μm. In addition, TiO ₂ was added to the base layer as a pigment. The hard coating layer was made by a thermal drying method and was formed to a thickness of 10㎛ using a urethane-based acrylate copolymer series to prepare a decor sheet, which was prepared by membrane molding.

Example  2

In the same manner as in Example 1, PET-G and PBT were mixed in a molar ratio of 7: 3, and the thickness of the base layer was formed to 400㎛ to prepare a decor sheet.

Example  3

In the same manner as in Example 1, the first skin layer and the second skin layer was further mixed with PCTG, PET-G, PBT and PCTG mixing ratio was 6: 4: 1 to prepare a decor sheet.

Example  4

The same procedure as in Example 3, except that the thickness of the first skin layer, the base layer and the second skin layer was formed to 400㎛ to prepare a decor sheet.

Comparative example  One

In the same manner as in Example 1, the first skin layer and the second skin layer was formed by PET-G alone to prepare a decor sheet.

Comparative example  2

The same procedure as in Example 1, except that the first skin layer, the base layer and the second skin layer was one layer, PET-G alone, the hard coating layer was UV cured, and the press sheet was decorated Prepared.

※ Test method

(1) elongation evaluation

The top layer films for decor sheets were cut into samples of 25 mm width x 100 mm length, respectively. The elongation was measured after facing the film along the direction using 1 kg weight (9.8 N / 2.5 mm) and leaving for 10 minutes.

(2) Scratchability test (pencil hardness test (high load evaluation))

The test was done by the pencil hardness tester. The test was conducted according to JIS K 5600-5-4 except that the tester was set so that the front part of the pencil gave a load of 750 g to the decor sheet when the tester was in the horizontal position.

(3) pollution resistance evaluation

Acid or alkali types (vinegar, coffee, soy sauce, etc.) were dropped on the decor sheet and then wiped off after 24 hours and examined.

1: No trace level

2: The level of traces can be seen in detail (can be identified at 0.30m)

3: level with traces (identifiable at 0.75m distance)

4: level of visible traces (identifiable at 1.5m)

division % Elongation Scratchability (pencil hardness) Pollution resistance evaluation Example 1 230 1H One Example 2 220 2H One Example 3 250 1H One Example 4 235 1H One Comparative Example 1 130 2B 4 Comparative Example 2 150 2B 3

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

Claims (9)

In the decor sheet,
The hard coating layer, the first skin layer, the base layer and the second skin layer are sequentially stacked from above,
The base layer is composed of PET-A, the first skin layer and the second skin layer decor sheet, characterized in that PET-G and PBT are mixed. The method of claim 1,
The PET-G and PBT mixing ratio is a moist ratio of 5.5: 4.5 to 7: 3. The method of claim 1,
The first skin layer and the second skin layer is PCTG is further mixed, PET-G, PBT and PCTG, the mixing ratio of the decor sheet, characterized in that the molar ratio of 5: 4: 1 to 6: 3: 1. The method of claim 1,
The pigment is decor sheet, characterized in that using any one of TiO ₂ , Pigment Yellow and Pigment Blue. The method of claim 1,
Deco sheet, characterized in that the thickness of the first skin layer, the base layer and the second skin layer is 200 to 400㎛. The method of claim 1,
The hard coating layer is a decor sheet, characterized in that the urethane-based acrylate copolymer series. The method of claim 1,
Deco sheet, characterized in that the hard coating layer has a thickness of 3 to 10㎛. The method of claim 1,
Decor sheet, characterized in that it further comprises a protective film layer on the top surface of the hard coating layer. The method of claim 1,
The decor sheet is characterized in that the decor sheet is manufactured by membrane molding.

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