KR20210123910A - Artificial leather and Manufacturing methoud for the same - Google Patents

Abstract

The present invention relates to a manufacturing method of an artificial leather capable of implementing a plurality of figures or characters in a plurality of colors. The present invention relates to the artificial leather and the manufacturing method of the artificial leather capable of manufacturing the artificial leather, wherein an optical pattern is implemented on the artificial leather while maintaining characters, figures and colors for a long period of time by exposing a printing layer to the outside.

Description

Artificial leather and manufacturing method thereof

The present invention relates to a method for manufacturing artificial leather, and more particularly, to an artificial leather capable of expressing various figures and characters without a separate printing or engraving process after manufacturing the artificial leather, and also expressing each figure in a different color. It relates to a method for manufacturing leather.

Background to the present disclosure is provided herein, which does not necessarily imply known art.

In general, artificial leather uses a process of forming a film with a synthetic resin such as PVC or PU (polyurethane) on a release paper with a leather pattern or other predetermined patterns, and then laminating it with a woven, knitted or non-woven fabric using an adhesive. to manufacture In this case, it is manufactured by transferring the shape of a figure or character to the surface of the synthetic resin through a release paper.

Recently, as the demands of consumers who purchase products to which the artificial leather is applied are diversified, there is a request to express various shapes or characters on the artificial leather itself, or to design the shapes in different colors. have.

Conventionally, after manufacturing artificial leather, heat and pressure are applied to the artificial leather to engraving figures or characters such as trademarks or to express the shape requested by consumers by using a printing method. However, since the engraving method requires a separate mold to be manufactured, it is difficult to apply it to a small amount of various varieties. In addition, the screen printing method after manufacturing artificial leather as disclosed in Korean Patent Registration No. 10-0310336 does not smoothly adhere to the skin layer of artificial leather, or even if adhered, the adhesive strength is weakened over time, so that the print quality is prolonged for a long time. There were problems that were difficult to maintain.

1. Republic of Korea Patent Registration No. 10-0310336 (199.02.09)

An object of the present invention is to provide a method for manufacturing artificial leather, which is easy to form various shapes and colors, such as figures or characters, on the surface of artificial leather.

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

One aspect of the present invention provides an artificial leather capable of implementing various colors.

Another aspect of the present invention provides a method for manufacturing artificial leather capable of implementing various colors.

The manufacturing method of artificial leather according to an embodiment of the present invention is:

preparing a release paper (S1);

forming a resin skin layer by applying a resin solution on the release layer of the release paper and drying (S2);

forming a printed layer on the back surface of the resin skin layer opposite to the release layer (S3);

forming an adhesive layer on the printed layer (S4); and

It may include removing the release paper from the resin skin layer to obtain artificial leather (S6).

In the above embodiment, the release paper may include a substrate layer having irregularities formed on the surface and a release layer on the substrate layer.

The base layer includes at least one selected from the group consisting of polystyrene (PS), polypropylene (PP), polyethylene terephthalate (PET), and polyvinylchloride (PVC). can be In addition, the base layer may include a pattern layer provided with irregularities using a photocurable resin on a flat base layer. In this case, the base layer includes at least one selected from the group consisting of polystyrene (PS), polypropylene (PP), polyethylene terephthalate (PET) and polyvinylchloride (PVC). is formed, and the pattern layer is at least one selected from the group consisting of a polyurethane-based, polyacrylate-based, polyepoxy-based, polyurethane-acrylate-based, polyester acrylate-based, polyepoxyacrylate-based and silicone-based UV curable resin. It may be formed including the above.

In the embodiment, the resin skin layer may have a total light transmittance of 70% or more and a haze of 20% or less.

In another embodiment of the present invention, there is provided an artificial leather comprising a resin skin layer having an optical pattern formed thereon, a printing layer, and an adhesive layer in order.

In another embodiment, the resin skin layer may have a total light transmittance of 70% or more and a haze of 20% or less. In addition, a base layer may be further included between the printing layer and the adhesive layer.

In addition, the artificial leather of the other embodiment may further include a fabric composed of one or more selected from woven fabrics, knitted fabrics, or non-woven fabrics.

According to the present invention, not only can various figures or characters be formed on artificial leather, but also various figures or characters can be implemented in various colors, and the artificial leather can be manufactured by simplifying the process.

1 is a cross-sectional view of a release paper used in a method of manufacturing artificial leather according to an embodiment of the present invention.
2 is a cross-sectional view of a release paper including a base layer.
3 is an exemplary view showing a manufacturing method of artificial leather according to an embodiment of the present invention.
4 is an exemplary view showing a cross-sectional structure of artificial leather according to another embodiment of the present invention.

Prior to describing the present invention in detail below, it is to be understood that the terminology used herein is for the purpose of describing specific embodiments and is not intended to limit the scope of the present invention, which is limited only by the appended claims. shall.

In addition, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor may properly define the concept of the term to describe his invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can. However, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art, unless otherwise stated.

Throughout this specification and claims, unless stated otherwise, the term comprise, comprises, comprising is meant to include the stated object, step or group of objects, and steps, and any other object. It is not used in the sense of excluding steps or groups of objects or groups of steps.

On the other hand, various embodiments of the present invention may be combined with any other embodiments unless clearly indicated to the contrary. Any feature indicated as particularly preferred or advantageous may be combined with any other feature and features indicated as preferred or advantageous.

An artificial leather manufacturing method according to an embodiment of the present invention includes the steps of preparing a release paper (S1), applying a resin solution on the release layer of the release paper and drying it to form a resin skin layer (S2); forming a printed layer on the back surface of the resin skin layer opposite to the release layer (S3); forming an adhesive layer on the print layer (S4); and removing a release paper from the resin skin layer to obtain artificial leather (S6).

As illustrated in FIG. 1 , the release paper may include a substrate layer 10 having an uneven surface and a release layer 20 on the substrate layer 10 . The release paper includes a structure capable of excellently transferring figures, characters, or patterns such as natural leather on the surface of artificial leather.

The base layer 10 may have irregularities in units of millimeters (mm) to micrometers (㎛) or irregularities in units of nanometers (nm). When the pattern of the base layer is relatively simple, the base layer 10 is made of polystyrene (PS), polypropylene (PP), polyethylene terephthalate (PET), and polyvinylchloride (PVC). It may be a single layer formed including at least one selected from the group consisting of.

In addition, when the transfer pattern is complicated or a hologram is required, the base layer 10 includes a pattern layer 12 provided with irregularities using a photocurable resin on a flat base layer 11 as shown in FIG. 2 . It may be a multi-layer formed by At this time, the base layer 11 is at least one selected from the group consisting of polystyrene (PS), polypropylene (PP), polyethylene terephthalate (PET) and polyvinylchloride (PVC). In the group consisting of a polyurethane-based, polyacrylate-based, polyepoxy-based, polyurethane acrylate-based, polyester acrylate-based, polyepoxy acrylate-based and silicone-based UV curable resin It may be formed including at least one or more selected.

Regarding the photocurable resin of the pattern layer 12, in order to practice the present invention, a person skilled in the art can appropriately select and use a photocurable resin that can easily form a fine pattern. For example, the photocurable resin composition disclosed in Korean Patent Application Laid-Open No. 10-2014-0111603 (2014.09.19.) and the like may be used for the pattern layer 12 .

On the other hand, in the specification of the present invention, the release paper refers to simultaneously expressing that the base layer or the base layer is derived from a film made of a synthetic resin as well as derived from paper. That is, in the present invention, the release paper is defined as a term including the release film.

The release layer 20 is mainly formed by a method of coating silicon or fluorine, but when implementing a hologram by forming fine irregularities in nanometer units, or when a fine and sophisticated pattern is required, Cr, Al, Ni, Si and As a metal-deposited layer of any one or more selected from the group consisting of alloys containing the same, it may be formed to a thickness of 10 to 1,000 Å. When the metal deposition layer is less than 10 Å, the release effect may be lowered, and when the metal deposition layer exceeds 1,000 Å, the accuracy of the pattern may be impaired. In terms of optimizing the release effect and transfer quality, the preferred thickness of the metal deposition layer may be 300 Å to 800 Å.

As a method of forming the unevenness on the surface of the base layer, a pattern may be formed by imprinting a resin or lithography. can be used

In one embodiment of the present invention, the step (S2) of forming the resin skin layer is a step of applying and drying a resin solution on the release paper, and the resin solution uses a solvent-type resin solution containing an organic solvent and a resin, or A water-soluble resin solution containing water may be used using a water-soluble resin.

The resin solution may have a total light transmittance of 70% or more and a haze of 20% or less. The total light transmittance and haze of the resin solution can be measured using a total light transmittance measuring instrument (NIPPON DENSHOKU, NDH2000) prepared in the form of an optical film. That is, when the resin solution is formed as a skin layer, it has optically transparent or translucent properties, so that the color and shape of the printed layer are transmitted through the skin layer opposite to the release layer and can be visually recognized.

The resin constituting the resin layer may be polyurethane, polyolefin, polyvinyl chloride, silicone, or the like. The organic solvent may be methyl ethyl ketone (Methylethylketone, MEK), dimethylformamide (Dimethylformamide, DMF), and the like.

The resin skin layer may be formed to have an appropriate thickness in consideration of use, durability, and material cost, and may have a thickness in consideration of a visual effect required for the printed layer to be visually recognized.

The step (S2) of forming a resin skin layer by applying a resin solution on the release layer of the release paper and drying it may be performed two or more times using the same or different resins. The meaning of proceeding two or more times may mean laminating the resin skin layer in two or more layers.

Looking at the cross-section of the laminated resin layer, the surface in contact with the release paper is transferred to the pattern embodied in the release paper to form irregularities, but the surface opposite to the release layer may be substantially flat.

The method for manufacturing artificial leather according to an embodiment of the present invention includes forming a printing layer on the back surface of the resin skin layer opposite to the release layer (S3). The formation of the printing layer may be performed in various shapes and colors such as figures and characters to be applied to the artificial leather obtained. Since the surface of the resin layer on which the printing layer is formed is substantially flat, the printing layer can be easily formed by a general printing method. The printed layer may be formed using, for example, inkjet printing or silkscreen printing.

On the other hand, in the manufacturing method of artificial leather according to an embodiment of the present invention, the resin skin layer formed in step S2 is exposed to a predetermined time and temperature to dry before the step (S3) of forming the print layer is performed (S2- 1) may be further included.

The color implemented in the printed layer may be reinforced by the base layer. That is, the method of manufacturing artificial leather according to an embodiment of the present invention may further include optionally forming a base layer on the printed layer (step S3-1) after forming the printed layer and before forming the following adhesive layer. can The base layer may be a substantially applied layer of white ink to reinforce the visibility of colors implemented in the printing layer. However, it is not necessarily white, and any color capable of reinforcing visibility by a color implemented in the printed layer and a complementary color effect, etc. may be used without limitation.

The base layer may further include a second resin layer as well as an application layer. That is, after the formation of the printing layer, the coating layer with white or a color ink capable of reinforcing visibility may be coated, and then the second resin layer may be further coated. The second resin layer may or may not be optically transparent. The color of the second resin layer can be selected according to a color required for artificial leather.

After forming the printed layer implementing various colors, the step (S4) of forming an adhesive layer on the printed layer may be performed. In one embodiment of the present invention, when the base layer alone or the base layer and the second resin layer are further formed on the printed layer, adhesion may be formed on the base layer or the second resin layer. And when the adhesive layer is formed on the second resin layer, the method may further include drying the second resin layer before application of the adhesive layer.

The adhesive layer may be selected according to the structure and use of the artificial leather. In other words, when artificial leather is used for a label of a relatively small size, the adhesive layer may be directly attached to the product. Accordingly, in the artificial leather obtained in the present invention, the structure including the resin skin layer, the printing layer and the adhesive layer can be independently distributed by itself. In this case, the adhesive layer is formed of, for example, hot melt and material, so that the adhesive force is lost during distribution, but the adhesive force can be expressed through heating during adhesion.

If necessary, the method of manufacturing artificial leather according to an embodiment of the present invention may include forming an adhesive layer on the resin skin layer and then laminating it with the fabric (step S5). More specifically, it is a step of applying and drying an adhesive on the resin skin layer to form an adhesive layer, and laminating fabrics such as woven fabrics, knitted fabrics, or non-woven fabrics.

The step of obtaining the artificial leather (S6) is a step of removing the release paper from the resin skin layer to obtain the artificial leather in which the unevenness on the release paper is transferred to the resin skin layer. There is no limitation on the method of removing the release paper, but it can be removed by applying a physical force to tear the release paper.

According to another aspect of the present invention, there is provided an artificial leather having various colors and having an optical effect by a pattern formed on the skin layer.

Referring to FIG. 3 by way of example, the artificial leather according to another embodiment of the present invention includes a resin skin layer, a printing layer, and an adhesive layer on which optical patterns are sequentially formed.

The resin skin layer includes a pattern transferred by a release paper, and the print layer has various colors and shapes formed by a conventional printing method. The resin skin layer may include an optically transparent resin. From the point of view of artificial leather, which is the final product, characters, figures, and their colors implemented in the printed layer located inside the skin layer can be visually recognized through the skin layer. In addition, since the optical irregularities transferred from the release paper are patterned on the skin layer, figures and characters of various colors recognized by the artificial leather can be visualized as shapes having optical properties at the same time. Accordingly, the transparency of the skin layer can be adjusted according to the required visual effect within the degree that the printed layer inside the skin layer can be recognized. For example, the total light transmittance of the skin layer resin may be 70% or more and the haze may be 20% or less.

The artificial leather according to another embodiment of the present invention may optionally include a base layer between the printing layer and the adhesive layer. The base layer is a layer capable of reinforcing the visibility of figures or colors formed on the printing layer, and may be, for example, a layer coated with white ink (or pigment). However, as long as the base layer is a color or a model that can supplement the visibility of a figure or color formed on the print layer, the color or model is not limited. In addition, the base layer may serve to enhance the stability of the printing layer by including an optically transparent resin layer.

The artificial leather according to another embodiment of the present invention may optionally include a second resin layer between the printing layer and the adhesive layer. The second resin layer may be composed of the same or different resin as the resin skin layer. The second resin layer may be optically transparent, but may be composed of an opaque colored resin according to a color to be realized in the artificial leather of the present invention.

In the embodiment of the present invention, when the second resin layer is reinforced, the stability of the printing layer against color change may be higher than when only the base layer is present.

Meanwhile, the base layer and the second resin layer, which may be further included between the printing layer and the adhesive layer, may be included in the artificial leather together, but the base layer or the second resin layer may be selectively included. When the base layer and the second resin layer are included together, the base layer may be applied on the print layer and the second resin layer may exist between the base layer and the adhesive layer.

The adhesive layer may be, for example, hot melt, and the artificial leather including the skin layer, the printed layer and the adhesive layer may be independently distributed.

If necessary, a fabric composed of at least one selected from woven, knitted or non-woven fabric may be distributed in the form of being adhered to the adhesive layer. In this case, the artificial leather may include a skin layer, a printing layer, an adhesive layer and a fabric in order.

Example

Injecting the UV-curable resin composition between the PET film (base layer) with a thickness of 100 microns and the mold with the fine concavo-convex layer (the mold with patterns between 1 μm and 500 μm of the pattern layer and 0.1 μm of the hologram pattern) and pressurized between the rubber rollers to maintain a certain thickness. After irradiating 500 mJ/cm 2 UV rays on the PET surface, the mold was demolded to form fine concavities and convexities on the surface of the PET to form a pattern layer on the PET base layer. The pattern layer was coated with silicone to form a release layer, and a release paper was prepared.

The composition of the ultraviolet curable resin used to form the pattern layer is shown in Table 2 below.

In Table 1, the UV-curable monomer is available from Satomer, and the photopolymerization initiator is available from Ciba.

A transparent PU resin having a total light transmittance of 90% and a haze of 5% was applied on the release paper. It was first applied to a thickness of 10 microns and then applied two more times with the same thickness. After drying the skin layer of the transparent PU resin, a printed layer was formed on the flat surface. The print layer was formed in three colors using silkscreen printing.

After forming the printed layer, a white base layer was applied to a thickness of 2 microns. After that, a white PU resin was further applied to a thickness of 10 microns and dried. (Formation of the second resin layer)

An adhesive layer was formed on the dried second resin layer, the fabric was adhered, and the release paper was separated to prepare artificial leather.

Claims (10)

Preparing a release paper (S1);
forming a resin skin layer by applying a resin solution on the release layer of the release paper and drying (S2);
forming a printed layer on the back surface of the resin skin layer opposite to the release layer (S3);
Forming an adhesive layer on the printed layer (S4) and,
Comprising the step (S6) of obtaining artificial leather by removing the release paper from the resin skin layer, the manufacturing method of artificial leather. The method according to claim 1, wherein the release paper comprises a base layer having irregularities on its surface and a release layer on the base layer. 3. The method of claim 2,
The base layer includes at least one selected from the group consisting of polystyrene (PS), polypropylene (PP), polyethylene terephthalate (PET), and polyvinylchloride (PVC). A method for manufacturing artificial leather 3. The method of claim 2,
The method for producing artificial leather, wherein the base layer includes a pattern layer provided with irregularities using a photocurable resin on a flat base layer. 5. The method of claim 4,
The base layer comprises at least one selected from the group consisting of polystyrene (PS), polypropylene (PP), polyethylene terephthalate (PET) and polyvinylchloride (PVC). become,
The pattern layer includes at least one selected from the group consisting of a polyurethane-based, polyacrylate-based, polyepoxy-based, polyurethane-acrylate-based, polyester acrylate-based, polyepoxyacrylate-based and silicone-based UV curable resin. A method for producing artificial leather, which is formed by The method of claim 1, wherein the resin skin layer has a total light transmittance of 70% or more and a haze of 20% or less. An artificial leather comprising a resin skin layer on which an optical pattern is formed, a printing layer, and an adhesive layer in order. The artificial leather according to claim 7, wherein the resin skin layer has a total light transmittance of 70% or more and a haze of 20% or less. The artificial leather of claim 7, further comprising a base layer between the printing layer and the adhesive layer. The artificial leather according to claim 7, further comprising a fabric composed of at least one selected from woven, knitted or non-woven fabric.

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