KR101248626B1 - Eco-friendly deco sheet with excellent formability and printability - Google Patents

Abstract

An eco-friendly decor sheet having excellent moldability is disclosed.
Eco-friendly decor sheet according to the present invention is formed of a surface layer, a back layer and one or more intermediate layers between the surface layer and the back layer, wherein the surface layer and the back layer is formed of a composite resin, each of the intermediate layer is It is characterized by being formed of a composite resin selected from a composite resin, ii) a composite resin and iii) a composite resin.
Iii) composite resin comprising PETG resin (A) and ester resin (C) (where Tg_C < Tg_A)
Ii) a composite resin comprising polyethylene terephthalate (PET) resin (B) and ester resin (C) (where Tg_C < Tg_B)
Iii) Composite resin comprising PETG resin (A), PET resin (B) and ester resin (C) (where Tg_C < Tg_A, Tg_B)

Description

Eco-friendly deco sheet with excellent moldability {ECO-FRIENDLY DECO SHEET WITH EXCELLENT FORMABILITY AND PRINTABILITY}

The present invention relates to a deco sheet used in furniture, sinks, etc. More specifically, it does not cause environmental hormone problems, more eco-friendly than PVC sheets, and excellent moldability Deco sheet that can be molded even when the bending surface is severe It is about.

In materials such as furniture, sinks and doors, coatings and decorative sheets are mainly used for decoration purposes.

In the case of the coating material, there is a UV-curable high gloss coating paint, but only a single color can be realized, and there is a problem of occurrence of yellowing of the applied paint and a decrease in glossiness with time.

In the case of the decoration sheet, a PVC sheet based on vinyl chloride resin (PVC) is mainly used. PVC sheets are widely used in various products due to their low cost and excellent processability, heat deformation, and excellent elongation.

However, in the case of PVC sheets, a large amount of dioxins are generated upon incineration. Such dioxin is a representative environmental hormone, and once produced, does not decompose and remains stable. In this case, if absorbed by the human body will not be discharged well will accumulate in the body. As a result, various cancers occur, and severe reproductive and developmental disorders may occur. In addition, damage to hormone regulation can occur.

Due to the human hazards of the PVC sheet as described above, regulations on various PVC products including the PVC sheet are being applied. In addition to these global trends, regulations are increasingly being strengthened in Korea.

In order to solve these problems, development through environmentally friendly materials has been made, and as a result, polyethylene terephthalate (PET) based PET sheet has been proposed.

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

In addition, the PET sheet may include an excessive amount of additive to secure moldability, but in this case, it is difficult to secure uniform printability.

It is an object of the present invention to provide an environmentally friendly decor sheet that is more environmentally friendly than conventional PVC sheets, and has low molding temperature and wide molding temperature similar to that of PVC.

Eco-friendly deco sheet according to an embodiment of the present invention for achieving the above object is formed of a single layer or two layers, each layer is polyethylene terephthalate glycol (PETG) resin (A) and ester resin ( C) (wherein Tg_C < Tg_A, Tg: glass transition temperature) is formed of a composite resin.

Eco-friendly deco sheet according to another embodiment of the present invention for achieving the above object is formed of a surface layer, a back layer and one or more intermediate layers between the surface layer and the back layer, the surface layer and the back layer is a composite resin Formed,

Each of the intermediate layers is formed of a composite resin selected from the following: i) a composite resin, ii) a composite resin, and iii) a composite resin.

Iii) composite resin comprising PETG resin (A) and ester resin (C) (where Tg_C < Tg_A)

Ii) a composite resin comprising polyethylene terephthalate (PET) resin (B) and ester resin (C) (where Tg_C < Tg_B)

Iii) Composite resin comprising PETG resin (A), PET resin (B) and ester resin (C) (where Tg_C < Tg_A, Tg_B)

Eco-friendly decor sheet according to the present invention is eco-friendly compared to the PVC sheet does not cause environmental hormone problems, it is possible to implement a variety of decorations by using a resin such as PETG excellent printing.

In addition, the eco-friendly decor sheet according to the present invention can be molded without the occurrence of whitening phenomenon in the bent portion even when the bending surface is severe with a wide molding temperature range, low molding temperature, overlay method, the membrane (membrane) method It can be applied to various methods such as lapping, high glossy method.

1 is a schematic cross-sectional view of an eco-friendly decor sheet according to an embodiment of the present invention.
Figure 2 schematically shows a cross-section of the eco-friendly decor sheet according to another embodiment of the present invention.
3 to 6 show the change in elastic modulus according to the temperature of the sheet prepared according to Examples 1 to 4.
Figure 7 shows the change in elastic modulus according to the temperature of the sheet prepared according to Comparative Example 1.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with 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, with reference to the accompanying drawings will be described in detail with respect to the eco-friendly decor sheet according to the present invention.

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

Referring to FIG. 1, the decor sheet of the single layer 110 structure shown is formed of a composite resin. Deco sheet of such a single layer structure can be produced by extrusion using a T-die.

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

In the present invention, PETG resin, because it is an amorphous polymer, there is a characteristic that the whitening phenomenon does not appear in the bent portion even when molding using a membrane (membrane) method. Such PETG resin may be commercially applied to SKYGREEN (manufactured by SK Chemicals), Spectar (manufactured by Eastman), or Eastar (manufactured by Eastman).

However, PETG resin itself is relatively high glass transition temperature (Tg) of about 80 ℃, the sheet based on this has a problem of high molding temperature.

In the present invention, the ester resin serves to lower the glass transition temperature (Tg) and the molding temperature of the PETG resin. For this purpose, the ester resin may be a resin having a relatively low glass transition temperature compared to the PETG resin. have. That is, when the glass transition temperature of PETG resin is Tg_A and the glass transition temperature of ester resin is Tg_C, the ester resin applied to the present invention satisfies Tg_C <Tg_A.

The ester resin may be a polybutylene terephthalate (PBT) resin. PBT resin can use what was obtained by liquid-phase polymerization or solid-state polymerization.

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

On the contrary, when the ester resin is contained in an amount of more than 10 parts by weight based on 100 parts by weight of the total composite resin, the glass transition temperature (Tg) and the molding temperature are excessively low. It causes workability defects to the extent that it becomes impossible, and also the sheet surface workability is degraded.

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

In addition, when the ester-based resin is included in the content ratio in the composite resin, when referring to Figures 3 to 6, the moldable temperature range according to the decrease in elastic modulus may be about 60 ~ 80 ℃.

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

The pigment can be used 1 type or in mixture of 2 or more types of white pigment, black pigment, yellow pigment, blue pigment, red pigment, and green pigment.

In particular, in the case of a white pigment, inorganic particles such as titanium oxide, calcium carbonate, barium sulfate, and magnesium carbonate may be used, and carbon black may be used as a black pigment. In addition, yellow pigments, blue pigments, red pigments, green pigments and the like can also be used without limitation.

The pigment may be added in 0.1 to 30 parts by weight based on 100 parts by weight of the composite resin. When the pigment is added in less than 0.1 part by weight relative to 100 parts by weight of the composite resin, there is a problem that the hiding power, the coloring power falls. On the contrary, when the pigment is added in excess of 30 parts by weight relative to 100 parts by weight of the composite resin, the viscosity of the composite resin may be lowered, which may cause processing problems.

1 illustrates an example of a single layer structure, a composite resin including a PETG resin and an ester resin may also be applied to a deco sheet of a two layer structure. Deco sheet of the two-layer structure can be produced through co-extrusion applying a T-die. The thickness of each layer may be determined according to the discharge amount during coextrusion.

In addition, the sheet produced through extrusion or coextrusion may have a thickness of about 200 ~ 1000㎛ depending on extrusion equipment, process conditions and the like.

Figure 2 schematically shows a cross-section of the eco-friendly decor sheet according to another embodiment of the present invention, shows an example of an eco-friendly decor sheet having a three-layer structure.

Referring to FIG. 2, the illustrated decor sheet includes a surface layer 210, a back layer 220, and an intermediate layer 230. In this case, the intermediate layer 230 may be formed as a single layer, and may also be formed as a multilayer.

At this time, the surface layer 210 and the back layer 220 is preferably formed of a composite resin containing a PETG resin (A) and an ester-based resin (C) (wherein Tg_C <Tg_A). The reason is that the composite resin including PETG resin (A) and ester resin (C) has clear color and excellent gloss, and is excellent in printability, impact resistance and chemical resistance, and can be molded in a wide range of conditions. .

The intermediate layer 230 is not limited to the surface layer 210 and the back layer 220 as described above, and thus may be formed of a composite resin selected from the following iii) composite resin, ii) composite resin and iii) composite resin. Can be.

Iii) composite resin comprising PETG resin (A) and ester resin (C) (where Tg_C < Tg_A)

Ii) a composite resin comprising polyethylene terephthalate (PET) resin (B) and ester resin (C) (where Tg_C < Tg_B)

Iii) Composite resin comprising PETG resin (A), PET resin (B) and ester resin (C) (where Tg_C < Tg_A, Tg_B)

In the i) 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 a PBT resin may be used.

In addition, the ester resin is preferably contained in 3 to 10 parts by weight with respect to 100 parts by weight of each composite resin as described above.

When the ester resin is included in the above range, each of i) the composite resin, ii) the composite resin and iii) the composite resin may have a glass transition temperature (Tg) of 70 ± 3 ℃, the sheet is molded The possible temperature range can be from 60 to 80 ° C.

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

However, when the pigment is applied to all of the surface layer 210, the back layer 220 and the intermediate layer 230, it may cause a cost increase, and when the pigment is applied only to the surface layer 210 or the back layer 220. Since hiding power may be reduced, the pigment is most preferably applied to the intermediate layer 230.

On the other hand, when the intermediate layer is formed of a IX) composite resin, the intermediate layer 230 may be formed 1 to 20 times the thickness of the surface layer 210 or the back layer 220. In this case, since the surface layer 210, the intermediate layer 230, and the back layer 220 have almost the same characteristics, the thickness of the intermediate layer 230 is almost 20 times that of the thickness of the surface layer 210 or the back layer 220. It may have a thick thickness.

On the other hand, when the intermediate layer 230 is formed of ii) a composite resin, it is preferable that the intermediate layer 230 is formed to be 1 to 8 times the thickness of the surface layer 210 or the back 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, crystallization of the PET resin during sheet molding Due to this, whitening may occur.

Deco sheets with three or more layers can also be produced through coextrusion with a T-die. In the case of the three-layer deco sheet, a feed block may be installed before the T-die for co-extrusion, and a three-layer structure may be manufactured using a composite resin from two extruders. When manufacturing the sheet of the three-layer structure, the interlayer thickness ratio may be determined according to the extrusion discharge amount.

As described above, in the present invention, by adding an ester resin having a relatively low glass transition temperature to a resin such as PETG, the glass transition temperature of the resin for producing the decor sheet can be lowered by approximately 10 ° C., and the elastic modulus can be reduced. This decreasing slope can be made small and can have a wider molding temperature range.

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

In addition, the decorative sheet according to the present invention can be molded even if the bend of the surface is severe without the occurrence of whitening phenomenon, the overlay (overlay) method, the membrane (membrane) method, the wrapping (wrapping) method, high gloss (high) It can be applied to various methods such as glossy).

Example

Hereinafter, the characteristics of the silicone pressure-sensitive adhesive composition according to the present invention through the preferred embodiment 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.

Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

1. Manufacture of Sheet

Example 1

30 g of PBT resin was added to 970 g of PETG resin, followed by extrusion compounding, followed by extrusion sheeting to 0.3 mm.

Example 2

50 g of PBT resin was added to 950 g of PETG resin, followed by extrusion compounding, followed by extrusion sheeting to 0.3 mm.

Example 3

70 g of PBT resin was added to 930 g of PETG resin, followed by extrusion compounding, followed by extrusion sheeting to 0.3 mm.

Example 4

100 g of PBT resin was added to 900 g of PETG resin, followed by extrusion compounding, followed by extrusion sheeting at 0.3 mm.

Comparative Example 1

1000 g of PETG resin alone was extrusion sheeted to 0.3 mm.

2. Moldability Evaluation

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

3. Formability Evaluation Results

3 to 6 show the change in elastic modulus according to the temperature of the sheet prepared according to Examples 1 to 4, Figure 7 shows the change in elastic modulus according to the temperature of the sheet prepared according to Comparative Example 1.

In addition, Table 1 shows the moldability and glass transition temperature of the sheet prepared according to Examples 1 to 4 and Comparative Example 1.

[Table 1]

Referring to Table 1 and Figures 3 to 7, the sheet according to Examples 1 to 4 made of a composite resin added with PETG and 3 to 10% by weight of PBT, the elastic modulus lowering temperature range is usually 80 ℃ or less, glass It can be seen that the transition temperature is 70 ± 3 ℃.

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

Therefore, it can be seen that the sheet manufactured according to Examples 1 to 4 compared to the sheet prepared according to Comparative Example 1 can be molded in a low 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: back layer
230: middle layer

Claims (14)

delete delete delete delete delete delete It is formed of a surface layer, a back layer and at least one intermediate layer between the surface layer and the back layer,
The surface layer and the back layer is formed of the following i) composite resin,
Eco-friendly deco sheet, characterized in that each of the intermediate layer is formed of the following iii) composite resin.
Iii) composite resin comprising PETG resin (A) and ester resin (C) (where Tg_C < Tg_A)
Iii) Composite resin comprising PETG resin (A), PET resin (B) and ester resin (C) (where Tg_C < Tg_A, Tg_B)
The method of claim 7, wherein
The ester resin is
Eco-friendly decor sheet, characterized in that the PBT resin.
The method of claim 7, wherein
The ester resin is
Eco-friendly deco sheet, characterized in that included in 3 to 10 parts by weight based on 100 parts by weight of each composite resin.
The method of claim 7, wherein
Each composite resin is
Eco-friendly decor sheet, characterized in that having a glass transition temperature (Tg) of 70 ± 3 ℃.
The method of claim 7, wherein
The sheet is
Further comprising a pigment in at least one layer, wherein the pigment is eco-friendly decor sheet, characterized in that contained in 0.5 to 30 parts by weight based on 100 parts by weight of the composite resin of the layer.
The method of claim 7, wherein
The sheet is
Eco-friendly deco sheet, characterized in that the moldable temperature range of 60 ~ 80 ℃.
delete delete

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