KR101562697B1 - Eco-friendly deco sheet with excellent formability and printability - Google Patents

Abstract

An eco-friendly decorative sheet excellent in moldability is disclosed.
The eco-friendly decorative sheet according to the present invention comprises a surface layer, a backside layer, and at least one intermediate layer between the surface layer and the backside layer, wherein the surface layer and the backside layer are formed of i) a composite resin, And is formed of a composite resin.
(I) a composite resin comprising a PETG resin (A) and an ester resin (C) (provided that Tg_C < Tg_A)
(Ii) a composite resin containing polyethylene terephthalate (PET) resin (B) and ester resin (C) (provided that Tg_C <Tg_B)

Description

ECO-FRIENDLY DECO SHEET WITH EXCELLENT FORMABILITY AND PRINTABILITY "

The present invention relates to a decorative sheet for use in furniture, a sink, etc. More specifically, it relates to a decorative sheet which is environmentally friendly as compared with a PVC sheet without causing an environmental hormone problem and has excellent moldability, .

Coatings and decorative sheets are mainly used for decorating purposes in furniture, sinks, and doors.

In the case of the coating material, there is a UV curing type high gloss coating paint, but it is possible to realize only a single color, and there is a problem of occurrence of yellowing of the applied paint and decrease of gloss according to time.

In the case of decorative sheets, PVC sheets based on vinyl chloride resin (PVC) have conventionally been used. In the case of PVC sheets, they are widely used in various products due to their low cost and excellent processability, heat change and excellent elongation.

However, in the case of a PVC sheet, a large amount of dioxin is generated when incinerated. Such dioxins are representative environmental hormones, and once produced, they are stable and not degraded. In this case, if it is absorbed by the human body, it will not be released well and accumulate in the body. As a result, it causes various cancers, severe reproductive system disorders and developmental disorders. In addition, damage to the regulatory function of the hormone can occur.

Due to the human hazards of the PVC sheet as described above, various PVC products including PVC sheets are being regulated. Along with these global trends, regulations are being strengthened in Korea.

In order to solve these problems, development is carried out through environmentally friendly materials, and as a result, a PET sheet based on polyethylene terephthalate (PET) is proposed.

In the case of PET sheet, the surface quality is excellent, but it has a higher molding temperature than PVC sheet, and the range of forming temperature is also narrow. That is, the PET sheet is not excellent in moldability.

In addition, in the case of a PET sheet, an excess amount of an additive may be contained in order to ensure moldability. However, in this case, it is difficult to ensure uniform printability.

It is an object of the present invention to provide an eco-friendly decorative sheet which is environmentally friendly as compared with existing PVC sheets, has a low molding temperature and a wide molding temperature as PVC, and is excellent in moldability.

In order to achieve the above object, an eco-friendly decorative sheet according to an embodiment of the present invention is formed of a single layer or two layers, and each layer is formed of polyethylene terephthalate glycol (PETG) resin (A) C) (wherein Tg_C <Tg_A, Tg: glass transition temperature).

According to another aspect of the present invention, there is provided an environmentally friendly decor sheet comprising a surface layer, a back layer, and at least one intermediate layer between the surface layer and the back layer, wherein the surface layer and the back layer comprise: Formed,

Wherein each of the intermediate layers is formed of a composite resin selected from the group consisting of i) a composite resin, ii) a composite resin, and iii) a composite resin.

(I) a composite resin comprising a PETG resin (A) and an ester resin (C) (provided that Tg_C < Tg_A)

(Ii) a composite resin containing polyethylene terephthalate (PET) resin (B) and ester resin (C) (provided that Tg_C <Tg_B)

Iii) a composite resin comprising PETG resin (A), PET resin (B) and ester resin (C) (provided that Tg_C <Tg_A, Tg_B)

The eco-friendly deco sheet according to the present invention does not cause an environmental hormone problem and can be variously decorated by using a resin such as PETG which is eco-friendly and superior in printing property compared with a PVC sheet.

Further, the eco-friendly deco sheet according to the present invention can be formed in a wide molding temperature range, a low molding temperature, and even in the case where the adhered surface is strongly curved, without forming a whitening phenomenon at a bent portion, A wrapping method, a high glossy method, and the like.

1 schematically shows a cross section of an environmentally friendly decor sheet according to an embodiment of the present invention.
2 is a schematic cross-sectional view of an environmentally friendly decor sheet according to another embodiment of the present invention.
Figs. 3 to 6 show changes in modulus of elasticity of the sheet produced according to Examples 1 to 4 with temperature. Fig.
7 shows the change in modulus of elasticity of the sheet produced according to Comparative Example 1 with temperature.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, an eco-friendly decorative sheet according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 schematically shows a cross-section of an environmentally friendly decor sheet according to an embodiment of the present invention, and shows an example of a decor sheet having a single-layer structure.

Referring to Fig. 1, the decor sheet of the illustrated single layer 110 structure is formed of a composite resin. Such a mono-layered decor sheet can be produced through extrusion using a T-die.

At this time, the composite resin forming the single layer (110) structure includes polyethylene terephthalate glycol (PETG) resin and ester resin.

In the present invention, since the PETG resin is an amorphous polymer, whitening does not occur at the bending portion even when the membrane is formed by the membrane method. Such PETG resins are commercially available from SKYGREEN (manufactured by SK Chemical), Spectar (manufactured by Eastman), or Eastar (manufactured by Eastman).

However, the PETG resin itself has a relatively high glass transition temperature (Tg) of about 80 DEG C, and the sheet based thereon has a problem of high molding temperature.

In the present invention, the ester-based resin serves to lower the glass transition temperature (Tg) and the molding temperature of the PETG resin. For this purpose, a resin having a glass transition temperature relatively lower than that of the PETG resin can be used as the ester- have. That is, when the glass transition temperature of the PETG resin is Tg_A and the glass transition temperature of the ester resin is Tg_C, the ester resin used in the present invention satisfies Tg_C <Tg_A.

Such an ester-based resin (polybutylene terephthalate, hereinafter referred to as PBT) resin can be used. As the PBT resin, those obtained by liquid phase polymerization or solid phase polymerization can be used.

The ester-based resin is preferably contained in an amount of 3 to 10 parts by weight based on 100 parts by weight of the entire composite resin. When the ester-based resin is contained in an amount of less than 3 parts by weight based on 100 parts by weight of the total weight of the composite resin, the glass transition temperature (Tg) of the composite resin and the degree of lowering of the molding temperature are insignificant.

On the contrary, when the ester-based resin is contained in an amount of more than 10 parts by weight based on 100 parts by weight of the entire composite resin, the glass transition temperature (Tg) and the molding temperature are excessively lowered, Resulting in a poor processability to such an extent that it becomes impossible, and the sheet surface processability also deteriorates.

When the ester resin is contained in the composite resin in the above-mentioned content ratio, the composite resin may have a glass transition temperature (Tg) of 70 ± 3 ° C. This corresponds to a glass transition temperature of about 10 占 폚 lower than that of PETG resin having a glass transition temperature of about 80 占 폚.

When the ester resin is contained in the composite resin in the above-mentioned content ratio, referring to FIG. 3 to FIG. 6, the moldable temperature range due to the lowering of the elastic modulus may be about 60 to 80 ° C.

On the other hand, the composite resin may further include 0.5 to 30 parts by weight of pigment relative to 100 parts by weight of the composite resin.

The pigment may be a white pigment, a black pigment, a yellow pigment, a blue pigment, a red pigment, a green pigment, or the like, or a mixture of two or more thereof.

Particularly in the case of white pigments, inorganic particles such as titanium oxide, calcium carbonate, barium sulfate, and magnesium carbonate can be used, and carbon black can be used as the black pigment. In addition, yellow pigments, blue pigments, red pigments, green pigments, and the like, which can be readily obtained commercially, can be used without limitation.

The pigment may be added in an amount of 0.1 to 30 parts by weight based on 100 parts by weight of the composite resin. When the pigment is added in an amount of less than 0.1 part by weight based on 100 parts by weight of the composite resin, hiding power and tinting power are deteriorated. On the contrary, when the pigment is added in an amount exceeding 30 parts by weight based on 100 parts by weight of the composite resin, the viscosity of the composite resin is lowered, which may cause processing problems.

Although FIG. 1 shows an example of a single layer structure, the composite resin including PETG resin and ester resin may also be applied to a decor sheet having a two-layer structure. A two-layer decorative sheet can be produced by co-extrusion with a T-die applied. The thickness of each layer can be determined according to the pneumatic discharge volume.

In addition, the sheet produced through extrusion or coextrusion may have a thickness of approximately 200-1000 탆 according to extrusion equipment, process conditions, and the like.

FIG. 2 is a schematic cross-sectional view of an eco-friendly decorative sheet according to another embodiment of the present invention, showing an example of an eco-friendly decorative sheet having a three-layer structure.

2, the illustrated decor sheet includes a surface layer 210, a backside layer 220, and an intermediate layer 230. At this time, the intermediate layer 230 may be formed as a single layer, or may be formed in multiple layers.

At this time, the surface layer 210 and the backside layer 220 are preferably formed of a composite resin including a PETG resin (A) and an ester resin (C) (Tg_C <Tg_A). The reason for this is that the composite resin including the PETG resin (A) and the ester resin (C) has a clear color and an excellent gloss, is excellent in printing property, impact resistance and chemical resistance and can be molded under a wide range of conditions .

The intermediate layer 230 is not limited to the same materials as the surface layer 210 and the backside layer 220 described above and is thus formed of a composite resin selected from i) a composite resin, ii) a composite resin, and iii) .

(I) a composite resin comprising a PETG resin (A) and an ester resin (C) (provided that Tg_C < Tg_A)

(Ii) a composite resin containing polyethylene terephthalate (PET) resin (B) and ester resin (C) (provided that Tg_C <Tg_B)

Iii) a composite resin comprising PETG resin (A), PET resin (B) and ester resin (C) (provided that Tg_C <Tg_A, Tg_B)

In the composite resin, i) the composite resin, ii) the composite resin, and iii) the composite resin, the ester resin serves to lower the glass transition temperature (Tg) and the molding temperature of each composite resin, and PBT resin may be used.

As described above, the ester resin is preferably contained in an amount of 3 to 10 parts by weight based on 100 parts by weight of each composite resin.

(I) the composite resin, (ii) the composite resin, and (iii) the composite resin may each have a glass transition temperature (Tg) of 70 ± 3 ° C., Possible temperature range can be 60 ~ 80 ℃.

In addition, the sheet may further contain 0.5 to 30 parts by weight of pigment in at least one of the surface layer 210, the back layer 220 and the intermediate layer 230, based on 100 parts by weight of the composite resin of the layer. The pigment may be contained in only one layer, or may be included in each layer.

However, when the pigment is applied to both the surface layer 210, the back layer 220 and the intermediate layer 230, the cost may be increased. In the case where the pigment is applied only to the surface layer 210 or the back layer 220 It is most preferable that the pigment is applied to the intermediate layer 230 as the hiding power may be lowered.

Meanwhile, when the intermediate layer 230 is formed of a composite resin, the intermediate layer 230 may be formed to have a thickness of 1 to 20 times the thickness of the surface layer 210 or the backside layer 220. In this case, since the surface layer 210, the intermediate layer 230, and the back layer 220 have substantially the same characteristics, the thickness of the intermediate layer 230 is extremely small, about 20 times the thickness of the surface layer 210 or the back layer 220 It can have a thick thickness.

If the intermediate layer 230 is formed of a composite resin, the intermediate layer 230 may be formed to have a thickness of 1 to 8 times the thickness of the surface layer 210 or the backside layer 220. In this case, since the composite resin constituting the intermediate layer 230 is based on PET, when the thickness of the intermediate layer 230 exceeds 8 times the thickness of the surface layer 210 or the back layer 220, The whitening phenomenon may occur.

Decor sheets having three or more layers can also be produced through co-extrusion with a T-die applied. In the case of a three-layered decor sheet, a three-layer structure can be manufactured using a composite resin from two extruders by installing a feed block before the T-die for co-extrusion. When producing a three-layered sheet, the interlayer thickness ratio can be determined according to the extrusion discharge amount.

As described above, in the present invention, by adding an ester-based resin having a relatively low glass transition temperature to a resin such as PETG, it is possible to lower the glass transition temperature of the resin for producing the decor sheet by about 10 DEG C, Can be reduced to have a wider molding temperature range.

Accordingly, in the present invention, it is possible to produce a decor sheet having a processing temperature and moldability similar to those of PVC without discharging environmental hormones such as PVC.

In addition, the decor sheet according to the present invention can be formed without causing whitening at the curved portion even when the curved surface of the adhered surface is severe, and can be formed by an overlay method, a membrane method, a wrapping method, a high glossy method and so on.

Example

Hereinafter, characteristics of the silicone pressure-sensitive adhesive composition according to the present invention will be described with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

The contents not described here are sufficiently technically inferior to those skilled in the art, and a description thereof will be omitted.

1. Manufacture of sheet

Example 1

30 g of PBT resin was added to 970 g of PETG resin and extrusion compounded, followed by extrusion-sheeting at 0.3 mm.

Example 2

50 g of PBT resin was added to 950 g of PETG resin and extrusion compounded, followed by extrusion-molding at 0.3 mm.

Example 3

70 g of PBT resin was added to 930 g of PETG resin, extrusion compounded, and extrusion-molded at 0.3 mm.

Example 4

100 g of PBT resin was added to 900 g of PETG resin, extrusion compounded, and extrusion-molded at 0.3 mm.

Comparative Example 1

1000 g of PETG resin alone was extruded to 0.3 mm.

2. Formability evaluation

In order to evaluate the formability of the sheet produced according to Examples 1 to 4 and Comparative Example 1, the change and the range of the modulus of elasticity with temperature were measured using DMA (Dynamic Mechanical Analysis).

3. Formability evaluation result

FIGS. 3 to 6 show the change in modulus of elasticity of the sheet prepared according to Examples 1 to 4 according to the temperature, and FIG. 7 shows the change in modulus of elasticity with the temperature of the sheet prepared according to Comparative Example 1.

Table 1 shows the formability and glass transition temperature of the sheet produced according to Examples 1 to 4 and Comparative Example 1. [

[Table 1]

Referring to Table 1 and FIGS. 3 to 7, in the case of the sheet according to Examples 1 to 4 made of a composite resin to which PETG and 3 to 10% by weight of PBT are added, the elastic modulus lowering temperature range is generally 80 ° C or less, It can be seen that the transition temperature is 70 占 占 폚.

On the other hand, in the case of the sheet according to Comparative Example 1 prepared by PETG alone, the elastic modulus lowering temperature range was relatively higher than those of Examples, and the glass transition temperature was 80 占 폚, which was about 10 占 폚 higher than the Examples.

Therefore, in the case of the sheet prepared according to Examples 1 to 4 as compared with the sheet produced according to Comparative Example 1, it can be seen that molding is possible in a lower molding temperature range.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. . Accordingly, the true scope of the present invention should be determined by the following claims.

110: Fault
210: Surface layer
220: backside layer
230: middle layer

Claims (7)

Surface layer; A backside layer; And at least one intermediate layer between the surface layer and the backside layer,
Wherein the surface layer and the back layer are formed of i) a composite resin,
Wherein each of the intermediate layers is formed of the following composite resin: ii) an eco-friendly decor sheet:
(I) a composite resin comprising a PETG resin (A) and an ester resin (C) (provided that Tg_C <Tg_A)
Ii) a composite resin comprising polyethylene terephthalate (PET) resin (B) and ester resin (C) (provided that Tg_C <Tg_B).
The method according to claim 1,
The ester-based resin
(EN) An eco - friendly decorative sheet characterized by being a polybutylene terephthalate (PBT) resin.
The method according to claim 1,
The ester-based resin
And 3 to 10 parts by weight based on 100 parts by weight of each of the composite resins.
The method according to claim 1,
Each of the composite resins
And a glass transition temperature (Tg) of 70 占 폚 to 3 占 폚.
The method according to claim 1,
The sheet
Wherein the at least one layer further comprises a pigment, wherein the pigment is contained in an amount of 0.5 to 30 parts by weight based on 100 parts by weight of the composite resin of the layer.
The method according to claim 1,
The sheet
Wherein the moldable temperature range is from 60 to 80 占 폚.
The method according to claim 1,
The intermediate layer
Wherein the thickness of the surface layer is 1 to 8 times the thickness of the surface layer.

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