KR20180013668A - Polyester-based deco sheet with feel of glass - Google Patents

Abstract

Provided is a glass-like decorative sheet which is based on a polyester-based resin and consists of a transparent layer and a colored layer. More specifically, provided is a polyester-based decorative sheet which is capable of securing decorative effects by attaching the sheet to automotive interior materials, creates three-dimensional effects and depth in decorative layers or lower colors by including a transparent layer having a glass-like texture, and brings reduction in production costs compared to general acrylic products.

Description

Background Art [0002] Polyester-based deco sheet with feel of glass [

The present invention relates to a polyester textured decor sheet.

In order to realize various surface textures for household appliances, furniture, interior materials for automobiles, etc., various textures are being implemented by using paint coating and printing film adhesion. Among them, glass materials are used as high-grade decorative materials because of the transparency of the material, strong surface hardness, and excellent flatness of the material, as well as a flat surface texture such as a mirror surface and a depth of a color layer and a design layer adhered to the glass bottom surface.

However, due to the nature of fragile materials, handling is complicated, difficulties in cutting / chamfering process, and the weight of the final product due to heavy weight relative to the plastic material, etc., are obstacles to product application.

In order to overcome the disadvantages of glass and to achieve a glass-like texture, acrylic and polycarbonate materials have been partially applied as substitute materials, but due to their high price, they have been restricted to a wide range of applications, overcoming the fragile characteristics of glass And it is required to develop a product which is economical to manufacture compared to acrylic and polycarbonate.

International Publication No. WO 2012/148099 International Publication No. WO 2015/026066

The present invention provides a method for realizing a glass texture based on a polyester-based material including polyethylene terephthalate, thereby reducing manufacturing cost compared to acrylic or polycarbonate.

In order to solve the above problems, (A) a color layer, (b) a transparent layer formed on the color layer and adjacent to the color layer, wherein the ratio of the thickness of the transparent layer to the thickness of the color layer is 2 to 19 : 1, and the color layer and the transparent layer are made of a polyester-based material.

According to one embodiment of the present invention, there is provided a multilayer decorative sheet produced by laminating a colored layer and a transparent or semitransparent monolayer on the basis of a polyester-based resin, or by coextrusion. The transparent or translucent polyester-based monolayer is a key element in showing the color depth sense of the undercolor layers such as glass. It is an amorphous material such as glass that does not interfere with the transmission of light, Or to give a three-dimensional feeling of texture.

According to various embodiments of the present invention, a method of manufacturing a transparent or translucent polyester-based layer as a single layer so as to improve the depth feeling of the color layer to the same level as glass, .

The present invention provides a decorative sheet that can be used in applications where a decorative effect can be realized by attaching sheets such as furniture, automobile interior materials, and the like, and includes a transparent layer similar to the texture of glass, Provides polyester decorative sheet that can reduce manufacturing cost compared to acrylic product.

1 is a schematic view showing a cross-sectional structure of a decor sheet according to an embodiment of the present invention.

(A) a color layer, (b) a transparent layer formed on the color layer and adjacent to the color layer, wherein the ratio of the thickness of the transparent layer to the thickness of the color layer is 2 to 19 : 1, and the color layer and the transparent layer are made of a polyester-based polymer material.

When the thickness is less than the lower limit value of the numerical range of the thickness, the thickness of the transparent layer is relatively small and the glass texture effect is lowered. When the upper limit is exceeded, the thickness of the color layer is relatively small and excessive introduction of color dyes or pigments Further, there may be a problem in the extrusion process which makes it difficult to produce a color layer having a uniform color distribution.

As the effect of the present invention in the present invention, when a layer including a color or a design is placed on the lower surface of a transparent glass, the glass texture means that, due to the difference in refractive index between the amorphous glass and air, And a high degree of flatness of the interface between the glass surface and the under-color layer, and also means that the color layer or the design layer exists deeply under the surface.

An example of the above polyester-based polymer (1) is polyethylene terephthalate.

According to one embodiment, (c) a primer layer formed on the transparent layer and adjacent to the transparent layer, and (d) a protective coating layer formed on the primer layer and adjacent to the primer layer.

According to another embodiment, the transparent layer is a single layer. According to another embodiment, the color layer comprises a design of a single color or a plurality of colors. In the present invention, a single layer is a layer having two or more multi-layer structures made of the same polyester-based polymer having a homogeneous refractive index that can not confirm the interlayer interface due to the difference in refractive index between layers, ≪ / RTI >

According to another embodiment, the degree of gloss (60 degrees) analyzed by ASTM D523 using a gloss meter such as BYK's micro-TRI-gloss is 4% to 100%, particularly preferably 40% % To 100%. According to another embodiment, the total transmittance from the lower portion of the color layer to the upper portion of the transparent layer is 0.1% to 10% as measured according to ASTM D1003 using a device such as COH-400 manufactured by Nippon Denshoku. According to another embodiment, the color brightness (L) value in the direction of the transparent layer of the decor sheet measured according to ASTM E1164 using a machine such as CM-2500D of Minolta Co. is not less than 1% 40% lower.

Numerous examples according to various embodiments of the present invention and numerous comparative examples were prepared and analyzed. As a result, the glass texture and physical properties such as visibility and 3D sensibility of the design of the lower color layer and the shielding property against defects on the surface of the bottom substrate layer (Iii) the degree of gloss observed from above the transparent layer in addition to the ratio of (i) the double layer structure of the transparent layer-color layer, (ii) the thickness ratio of the transparent layer and the color layer, (V) the color brightness index difference between the color layer and the transparent layer should be within a certain range.

That is, (i) a double-layer structure of a transparent layer and a color layer should be provided, (ii) a double-layer structure of a transparent layer and a color layer should be provided, a transparent layer with a thickness ratio of the colored layer is 2 to 19: be 1, and, (iii) a color layer the lower the gloss is also observed in the transparent layer upper in accordance with ASTM D523 should be 40% to 100%, and, (iv) according to ASTM D1003 (V) the color brightness index difference between the color layer and the transparent layer measured in accordance with ASTM E1164 should be 1% to 40%, and only one If any one of the five conditions is not satisfied, the glass texture and the physical properties such as the visibility for the design of the lower color layer and the shielding property against the defect of the surface of the lowermost base layer are lowered as a whole It was OK.

According to another embodiment, the thickness of the decor sheet is 600 to 4,000 mu m. If the thickness is less than the lower limit value of the numerical range of the decorative sheet thickness, there may be a problem that the glass texture and the three-dimensional effect are not effectively revealed. If the upper limit value is exceeded, the polyester resin undergoes microcrystallization during the extrusion process, , A decrease in the transmittance, and a decrease in the sense of depth.

According to another embodiment of the present invention, a primer solution and a hard coating solution are coated on the transparent layer by a microgravure method. According to another embodiment, metal, inorganic or polymer particles having a particle diameter of 0.1 to 1 μm are dispersed in the color layer have. In the color layer, the above-mentioned particles are dispersed, and pearles, matte or semi-light, and fine uneven color are expressed.

According to another embodiment, the color layer and the transparent layer are laminated by an extrusion lamination method or co-extrusion. In other words, in order to realize a glass texture using a plastic material having a low price and high transparency, it is possible to manufacture by two methods. The first is a method of manufacturing a color film of a polyester material including color dyes and pigments by an extrusion method and extrusion laminating the finished color film during a transparent polyester extrusion process to produce a color layer / Layer and a transparent layer polyester material are co-extruded to produce a multilayered sheet.

Hereinafter, the present invention will be described in more detail with reference to Examples and the like, but the scope and content of the present invention can not be construed to be limited or limited by the following Examples. 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 and scope of the present invention as set forth in the following claims. It is natural that it belongs to the claims.

In addition, the experimental results presented below only show representative experimental results of the embodiments and the comparative examples, and the respective effects of various embodiments of the present invention which are not explicitly described below will be specifically described in the corresponding part.

Example

Example

A polyester resin including a master batch based on a polyester resin including a color dye and a pigment, and a polyester virgin raw material were put into respective extruders, and they were extruded under the condition of an extrusion chamber temperature of 270 DEG C, In order to make the two components melt-extruded into a sheet-like structure of a layered structure, they are passed through a feed block and a T-die or connected to different channels of a multi-layered T-die and extruded. And wound up to produce a sheet having a multi-layer structure. In order to achieve the desired effect of the present invention, the ratio of the thickness of the transparent layer to the thickness of the color layer is necessarily 2: 1 or more and 19: 1 or less. In this embodiment, the ratio of the transparent layer to the color layer is 1: mm < / RTI >

The extruded component of the color layer is a polyester-based white color masterbatch of 10% by weight, and the raw material mixed with the virgin polyester resin is discharged at a discharge amount of 100 kg per hour and the transparent layer extruded component is discharged at a discharge amount of 400 kg per hour of the virgin polyester resin Extruded, passed through a flow path of a two-layer structure, passed through a T-die and cooled through a cooling roll to produce a sheet having a thickness of 1 mm, a color layer of 0.2 mm and a transparent layer of 0.8 mm. The primer solution and the hard coating solution were coated on the surface of the sheet by a microgravure method, followed by drying and curing by thermal drying and UV curing, respectively, to form a protective coating layer to prepare a final product.

The gloss of the upper part of the transparent layer was measured according to ASTM D523 using a gloss meter (BYK, micro-TRI-gloss). The total transmittance of the color layer to the transparent layer was measured with COH-400 (Nippon Denshoku) D1003. As a result, the gloss was 92% and the total transmittance was 1.2%.

The color brightness of the decor sheet in the direction of the transparent layer was measured based on the D65 light source using the Minolta CM2500D, and the color brightness index of 84.88 was confirmed. The color brightness of the color layer alone was measured by the same method in the color layer direction, The color brightness index of 92.51 was confirmed. As a result, the color brightness in the direction of the transparent layer was 8.3% lower than that of the color layer.

Comparative Example 1

Except that the same material as the white color layer extruded component was used instead of the transparent layer extruded component to prepare a 1 mm thick sheet composed of a color layer and a single layer and then a protective coating layer was formed to prepare a comparative product Respectively.

The glossiness was 91%, the total transmittance was 0.5%, the color brightness index on the color surface was 92.66 and 92.71, respectively, and the color brightness difference on the upper and lower surfaces was 0.05%.

Comparative Example 2

The final product was prepared by the same process as in the Example except that the color master batch input weight ratio of the color layer extrusion raw material was adjusted to 1% and the same protective coating layer as that of Example was formed on the transparent layer.

It was confirmed that the difference in the color brightness in the direction of the transparent layer and the color layer in the direction of the color layer was 3.5%, the glossiness was 91.5%, the total transmittance was 18%, the color brightness index in the direction of the transparent layer was 73.20 and the color brightness index in the color layer direction was 75.82.

Comparative Example 3

A sheet having a transparent layer of 200 μm, a color layer of 800 μm and a total thickness of 1 mm was prepared by extruding the color layer raw material at an amount of 400 kg per hour and the transparent layer raw material at 100 kg per hour, Coating layer was formed to prepare a comparative product.

The glossiness was 91.8%, the total transmittance was 0.3%, the color brightness index in the transparent layer direction was 92.24, and the color brightness index in the color layer direction was 92.98, and the difference in color brightness in the color layer direction was 0.8%.

Comparative Example 4

A sheet was prepared by the same process as that of Example, except that a 0.4 mm thick sheet was produced by changing the line speed upon extrusion, and then a protective coating layer was formed to prepare a comparative product.

The glossiness was 92%, the total transmittance was 0.6%, the color brightness index in the transparent layer direction was 91.94, and the color brightness index in the color layer direction was 92.77, and the difference in color brightness in the color layer direction was 0.9%.

Test Example 1 and Comparative Test Examples 1 to 4

(1) the texture similarity with glass, (2) the visibility to the design of the lower color layer, (3) the depth or the dimensional sensation, and (4) the shielding property against the defect of the surface of the bottom substrate layer , And 5) uniformity of color distribution.

The sensory test was 50 men and 50 women between 30 and 50 years old. A total of 100 people were asked to complete a one - hour training course before the test so that stable results could be obtained.

The results were as follows. The results were as follows. The results were as follows. The results were as follows. The results were as follows.

Inspection items: ① texture similarity with glass, ② visibility of design of lower color layer, ③ depth or depth of feeling, ④ shielding against defect of surface of bottom layer, ⑤ color distribution uniformity

As described above, the present inventors have analyzed a myriad of embodiments satisfying the following five items and numerical ranges, and a number of comparative examples not satisfying any one of them, It can be derived as a parameter that plays an important role in providing the above inspection items that the deco sheet should have as a whole. In particular, when any one of the following items is not satisfied, the physical properties of the above five inspection items are deteriorated as a whole Respectively.

(ii) the thickness ratio of the transparent layer and the color layer is 2 to 19: 1, (iii) the degree of gloss observed from the top of the transparent layer according to ASTM D523 is 40 % to 100%, (iv) a total decay sheet transmittance of 0.1% to 10% measured from the bottom of the color layer to the top of the transparent layer according to ASTM D1003, (v) the color brightness index difference between the color layer and the transparent layer, measured according to ASTM E1164, %

Claims (7)

(a) a color layer, (b) a decor layer formed on the color layer and including a transparent layer adjacent to the color layer,
The ratio of the thickness of the transparent layer to the thickness of the color layer is 2 to 19: 1,
Wherein the color layer and the transparent layer are made of a polyester-based material. The decorative sheet of claim 1, further comprising (c) a primer layer formed on the transparent layer and adjacent to the transparent layer, and (d) a protective coating layer formed on the primer layer and adjacent to the primer layer. The method of claim 1 or 2, wherein the transparent layer is a single layer,
Characterized in that the color layer comprises a design of a single color or a plurality of colors. 4. The method of claim 3, wherein the gloss of the top of the transparent layer is 4% to 100% as measured according to ASTM D523,
The total transmittance of the decor sheet as analyzed by the transparent layer in the color layer according to ASTM D1003 is 0.1% to 10%
Wherein the difference in color brightness index between the transparent layer and the color blue analyzed according to ASTM E1164 is 1% to 40%. The decor sheet according to claim 4, wherein the thickness of the decor sheet is 600 to 5,000 μm. [6] The method of claim 5, wherein a hard coat layer having a gloss of 4% to 100% is formed on the transparent layer,
Wherein the color layer is formed by dispersing metallic, inorganic or high molecular weight particles having a particle diameter of 0.1 to 1 占 퐉. The decor sheet according to claim 6, wherein the color layer and the transparent layer are laminated by a co-extrusion or extrusion lamination method.

Images