KR20210039740A - Transparent polyester artificial leather and method for manufacturing the same - Google Patents

Abstract

The present invention relates to polyester artificial leather having a light transmitting function and a manufacturing method thereof, the polyester artificial leather comprising: a skin film layer which includes a polyether ester-based copolymer; a printing layer which prints a specific character or a shape on one surface of the skin film layer; and a base substrate layer which is formed in a lower part of the printing layer and is laminated with the printing layer. The skin film layer is characterized by dispersing and mixing fine spherical particles, which are formed by being pulverized with powder, an additive, and a pigment, with the polyether ester-based copolymer which is manufactured by performing condensation polymerization with a terephthalic acid, 1,4-butanediol, and polytetramethylene glycol.

Description

Polyester artificial leather and method for manufacturing the same

The present invention relates to a polyester artificial leather having a light-transmitting function and a method for manufacturing the same, and more particularly, to a polyester artificial leather having a light-transmitting function capable of optically expressing a specific shape and letter when a lighting device is illuminated on the rear side thereof, and It relates to a manufacturing method.

In order to implement a light-transmitting display device, conventionally, a light-transmitting material is mainly used, such as glass or transparent plastic, and a back light is used on the back side. When this lighting device is turned off, no letters or shapes are displayed. The material is displayed in its own color, and when the lighting device on the back is turned on, a specific letter or shape is transmitted through the light to appear on the surface.

However, if a translucent material such as glass or plastic is used as a display device, various patterns, soft textures, free deformability, and impact relief functions cannot be implemented.

In addition, if the artificial leather sheet made of a general polyurethane resin is used, various patterns, soft textures, free deformability and shock-relieving functions can be realized, but the light transmittance is low, so that a specific letter or shape cannot be expressed on the surface. In other words, artificial leather sheets using general polyurethane resins do not have any light transmission, but fine pores are formed by using a resin in which polyurethane and organic solvents (DMF, MEK) are mixed in the manufacturing process. As a result, light is absorbed or the transmittance is lowered, so that the light transmitting function is significantly deteriorated. For this reason, even if a lighting device is installed on the back of a general polyurethane artificial leather sheet, the display effect is hardly seen. In addition, such polyurethane artificial leather has an environmental problem in the manufacturing process and there is a problem of detecting residual harmful solvent substances.

As such a prior document, Patent No. 1680627 (name of the invention: a polyurethane artificial leather sheet for a display having a light-transmitting function) is a light-transmitting polyurethane made by mixing a functional pigment that transmits light through an optical action in a polyurethane resin. Although the conventional light-transmitting problem has been partially improved by forming the stratum, there is still a problem that the light-transmitting function is insufficient.

Korean Patent Registration No. 1680627 (2016.11.23)

Therefore, the object of the present invention is excellent in deformability, durability, light resistance, weather resistance, chemical resistance that can cover various product surfaces while having a pattern, wrinkle effect, and fullness like natural leather, no harmful substances are discharged, and Providing a lighting device is to provide a polyester artificial leather having a light-transmitting function capable of expressing a specific letter or shape on the surface.

Polyester artificial leather having a light-transmitting function according to an embodiment of the present invention for achieving the above object, a skin film layer comprising a polyether ester-based copolymer; A printing layer in which a specific letter or shape is printed on one surface of the skin film layer; And a base substrate layer formed under the printing layer and mixed with the printing layer, wherein the skin film layer is a polyether ester system prepared by condensation polymerization of terephthalic acid, 1,4 butanediol, and polytetramethylene glycol. It is characterized in that fine spherical particles formed by pulverizing powder, additives, and pigments in the copolymer are dispersed and mixed.

In addition, the polyester artificial leather having a light-transmitting function according to the present invention is formed by coating a water-based polyurethane-based polymer resin or a water-based polyester-based polymer resin on one side of the printing layer, and an adhesive layer bonding the base substrate layer and the printing layer It may further include;

In addition, the polyester artificial leather having a light-transmitting function according to the present invention may further include a surface treatment layer formed by coating a water-based polymer resin on an upper portion of the skin film layer.

In addition, in the polyester artificial leather having a light-transmitting function according to the present invention, the light-transmitting pigment is characterized in that 0.1 to 2.0% by weight.

In addition, in the polyester artificial leather having a light-transmitting function according to the present invention, the thickness of the skin film layer is characterized in that 100 ~ 250 ㎛.

In addition, in the polyester artificial leather having a light-transmitting function according to the present invention, the polyether ester-based copolymer has a melting point (Tm) of 150 to 190°C, a hardness of 20 to 30D (SHORE D hardness meter), and a melt flow index (MI). It is characterized in that 10 to 50 g/10min (220°C/2.16 kg) and a recovery rate (RESILIENCE) of 50 to 80%.

A method of manufacturing a polyester artificial leather having a light-transmitting function according to an embodiment of the present invention includes the steps of preparing a skin film layer; Forming a print layer in which a specific letter or shape is printed on one surface of the skin film layer; And forming a base substrate layer under the printing layer; including, wherein the preparing of the skin film layer comprises condensation polymerization of terephthalic acid, 1,4 butanediol, and polytetramethylene glycol to obtain a polyether ester-based copolymer Manufacturing a; And dispersing and mixing fine spherical particles formed by pulverizing the polyether ester-based copolymer with powder, additives, and pigments to prepare a film layer.

In addition, the method of manufacturing a polyester artificial leather having a light-transmitting function according to the present invention, after the step of forming the printing layer, by applying a water-based polyurethane-based polymer resin or a water-based polyester-based polymer resin on one side of the printing layer. It may further include; forming an adhesive layer bonding the base substrate layer and the printing layer.

In addition, the method of manufacturing a polyester artificial leather having a light-transmitting function according to the present invention may further include forming a surface treatment layer by applying a water-based polymer resin on the skin film layer (S50).

In addition, in the method for producing a polyester artificial leather having a light-transmitting function according to the present invention, the light-transmitting pigment is characterized in that 0.1 to 2.0% by weight.

In addition, in the manufacturing method of the polyester artificial leather having a light-transmitting function according to the present invention, the thickness of the skin film layer is characterized in that 100 ~ 250 ㎛.

In addition, in the method of manufacturing a polyester artificial leather having a light-transmitting function according to the present invention, the polyether ester-based copolymer has a melting point (Tm) of 150 to 190°C, a hardness of 20 to 30D (SHORE D hardness meter), and a melt flow index. (MI) 10 to 50 g/10min (220°C/2.16 kg) and a recovery rate (RESILIENCE) of 50 to 80%.

The polyester artificial leather having a light-transmitting function and its manufacturing method according to the present invention exhibit an aesthetic effect like natural leather when there is no light, and when a lighting device is illuminated on the back, optical expression of a specific shape and letter is possible.

In addition, the present invention can be used in automobile interiors, interior materials, home appliance skins, etc., because of its light transmission properties and excellent deformability, durability, light resistance, weather resistance, and chemical resistance.

1 is a cross-sectional view of a polyester artificial leather having a light-transmitting function according to an embodiment of the present invention.
2 is a process flow diagram showing a manufacturing step of a polyester artificial leather having a light-transmitting function according to an embodiment of the present invention.
3 is a photograph of the surface of a polyester artificial leather sheet in a state in which the lighting device is not turned on.
4 is a photograph of the surface of a polyester artificial leather sheet in a state in which the lighting device is turned on.
5 is a cross-sectional photograph of a polyether ester-based copolymer used in the skin film layer according to an embodiment of the present invention.
6 is a cross-sectional photograph of a conventional polyurethane resin used in the skin film layer.

Since the present invention can apply various transformations and have various embodiments, specific embodiments will be described in detail in the detailed description. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all conversions, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, when it is determined that a detailed description of a related known technology may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof does not preclude in advance.

Terms such as first and second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention.

1 is a cross-sectional view of a polyester artificial leather having a light-transmitting function according to an embodiment of the present invention.

Referring to FIG. 1, the polyester artificial leather having a light-transmitting function according to the present invention includes a skin film layer 20, a printing layer 30, and a base substrate layer 50.

The skin film layer 20 is a surface layer of artificial leather using a polyether ester block (BLOCK) copolymer. As a preferred embodiment according to the present invention, the skin film layer 20 may be obtained by dispersing and mixing fine spherical particles formed by pulverizing a polyether ester-based copolymer with powder, additives, and pigments.

Here, the polyether ester-based copolymer is preferably a block copolymer prepared by condensation polymerization of terephthalic acid, 1,4 butanediol, and polytetraethylene glycol. The copolymer has a melting point (Tm) of 130 ~ 220 ℃, preferably 150 ~ 190 ℃, hardness 20 ~ 30 D (hardness meter SHORE D) melt flow index (MI) 10 ~ 50 g / 10min (temperature 220 ℃ / 2.16kg) ), recovery rate (RESILIENCE) 50-80%, elongation at break may be 400-1000%.

Pigments applied to the skin film layer 20 are milled after adding various powders made of inorganic and metal and additives to increase processing stability. The pulverized pigment particles have a fine bead shape to which the additive is adsorbed (COATING), and the size of the particles is uniform. The size of the fine spherical particles can be made into a size of 0.01 ~ 4 ㎛ depending on the basic size and color of inorganic and metal powders.

When the amount of pigment is added in an amount of less than 0.1% by weight, the light transmittance of the skin film layer 20 is increased, so that even if an illumination device is not provided on the back side, a specific pattern and letters of the printing layer 30 are exposed, so that the texture like natural leather is not displayed. Does not. When the amount of the pigment is added in excess of 2.0% by weight, a problem occurs in that a specific pattern and letters of the printing layer 30 do not appear even if a lighting device is provided on the rear surface. Therefore, the translucent pigment is preferably 0.1 to 2.0% by weight.

The printing layer 30 is a layer in which a specific letter or shape is printed on one surface of the skin film layer 20. The print layer 30 is formed by thermally pressing a transfer film on which a specific design is printed on one surface of the skin film layer 20 through a heat transfer device and transferring it to the skin film layer 20.

Due to this printing layer 30, when there is no lighting device, the appearance is like artificial leather, and when the lighting device is supplied, a printed pattern appears.

The base substrate layer 50 is a basic part of artificial leather, and may be a single-component polyester warp-knitted paper, circular-knitted raised paper, non-woven fabric, or polyester sea-island microfiber non-woven fabric, but is not limited thereto.

The base substrate layer 50 is formed under the printing layer 30 and is mixed with the printing layer 30.

The base substrate layer 50 may be selected according to the use of the artificial leather produced by the present invention. Since artificial leather has different mechanical properties required according to its use, it is necessary to select the base substrate layer 50 in consideration of characteristics. For example, in order for artificial leather to have a soft texture, the base substrate layer 50 is a warp knitted fabric made of polyester having a voluminous feel, softness, and fullness, a microfiber nonwoven fabric, a high density nonwoven fabric, and a circular knitted fabric. , Or may be made of a resin-filled nonwoven fabric. The base substrate layer 50 is bonded with a HOT MELT adhesive layer or is capable of maintaining physical properties even if the artificial leather is pressed by temperature and pressure in the process of embossing the artificial leather.

The polyester artificial leather of the present invention includes a skin film layer 20, a printing layer 30, and a base substrate layer 50, and the skin film layer 20 is powdered in a polyether ester-based copolymer. , Additives and pigments are pulverized together to disperse and mix fine spherical particles formed to show better light transmittance than conventional polyurethane artificial leather.

Polyester artificial leather having a light-transmitting function according to another embodiment of the present invention comprises a surface treatment layer 10, a skin film layer 20, a printing layer 30, an adhesive layer 40, and a base substrate layer 50. Includes.

The surface treatment layer is formed by applying a water-based polymer resin coating solution to an upper portion of the skin film layer 20 by 30 g/sqm with a gravure roll, and drying it in a hot air chamber at 120°C. The water-based polymer resin of the surface treatment layer 10 may be 83 to 99.95% by weight of a water-based polyurethane resin or a water-based polyester resin. In addition, an abrasion strength enhancer, which is a silicone-based slip agent, may be added.

It is preferable that the thickness of the surface treatment layer 10 is 1 to 30 µm, and if it is less than 1 µm, there is a problem of weak strength, and if it is more than 30 µm, there is a problem that the touch feeling is deteriorated.

The adhesive layer 40 is formed by coating a water-based polyurethane-based polymer resin or a water-based polyester-based polymer resin on one surface of the printing layer 30, and bonds the base substrate layer 50 and the printing layer 30 to each other.

More specifically, the polyurethane-based adhesive resin is a polymer of aliphatic-based isocyanate and ester-based polyol or a polymer of isocyanate and ether-based polyol, and the aqueous polyester-based adhesive resin is terephthalic acid (TPA) and ethylene glycol. It is a polymer.

The thickness of the adhesive layer 40 is 20 to 150 µm, and if it is less than 20 µm, there is a problem that the adhesive strength is deteriorated, and if it is more than 150 µm, there is a problem that the emotional quality is deteriorated.

The skin film layer 20, the printing layer 30, and the base substrate layer 50 are as described above.

A method of manufacturing a polyester artificial leather having a light-transmitting function according to the present invention will be described with reference to FIG. 2 as follows. Here, Figure 2 is a process flow diagram showing a manufacturing step of the polyester artificial leather having a light-transmitting function according to the present invention.

First, the step (S10) of manufacturing the skin film layer 20 is to prepare the skin film layer 20, which is a surface layer of artificial leather.

The step (S10) of preparing the skin film layer 20 includes condensation polymerization of terephthalic acid, 1,4 butanediol, and polytetramethylene glycol to prepare a polyether ester-based copolymer (S12); And dispersing and mixing fine spherical particles formed by pulverizing powder, additives, and pigments in the polyether ester-based copolymer to prepare a film layer (S14).

To this end, it may be carried out as a film extrusion process through a melt mixing process for dispersibility of the material.

The polyether ester copolymer and the translucent pigment (fine spherical particles formed by pulverizing the powder, additive and pigment together) are compounded (melted and mixed) with a twin screw extruder so that the translucent pigment has high dispersibility in the copolymer. Process. When compounding, the translucent pigment is added in an amount of 0.1 to 2.0% by weight compared to the copolymer, and the processing temperature of the extruder cylinder is maintained at 170 to 220°C.

The pigment particles mixed in the form of fine particles are refracted between the particles and the particles when incident light enters the interior, and is reflected internally to pass through. Due to these optical properties (refraction, absorption, scattering, reflection, etc. of light), it has a soft feeling of light transmittance. At this time, additives used for pulverization of pigments are acrylic, light diffuser, silicone, and calcium carbonate. Any one selected from a dispersant and a fluorescent pigment, a brightener, a titanium, and a matting agent is used, and the dosage is adjusted differently according to the pigment structure characteristics of each color.

The compounded material (copolymer to which a pigment is added) is prepared in the form of a film through a T-Die extruder. The processing temperature of the T-Die extruder is maintained at 170 to 220°C, and the thickness of the skin film layer 20 may be 100 to 250 µm.

The thickness of the skin film layer 20 is correlated with the content of the included pigment, and when it is less than 100 μm, the hiding power is lowered, so that the pattern and letters of the printing layer 30 are easily revealed, and there are difficulties in processing in the post-process, If it exceeds 250㎛, even if illumination is provided, there is a problem that the pattern and letters of the printing layer 30 do not appear, and the quality of emotion is deteriorated.

Next, the step of forming the printing layer 30 (S20) is to form the printing layer 30 by printing a specific letter or shape on one surface of the skin film layer 20.

As a method of printing a specific pattern or character on one surface of the skin film layer 20, one of three methods of transfer film, gravure, and digital printing may be selected. For example, a carrier film and a transfer film with a specific design printed on it can be applied. The transfer film on which a specific design is printed is thermally compressed to one surface of the skin film layer 20 through a heat transfer device, and the printed layer 30 is transferred to the skin film layer 20. After aging the fabric to which the skin film layer 20 and the transfer film are bonded at room temperature for 5 to 24 hours, the carrier film of the transfer film is removed. Through this process, the printing layer 30 is closely adhered to one surface of the skin film layer 20.

And, the step of forming the adhesive layer 40 (S30) is after the step of forming the printing layer 30 (S20), a water-based polyurethane-based polymer resin or a water-based polyester-based polymer on one side of the printing layer 30 The base substrate layer 50 and the printing layer 30 are bonded by applying a resin.

At this time, the water-based polymer resin is applied to one surface of the printing layer 30 by a knife coating method or a gravure coating method. Coating amount is 50 ~ 300g/sqm, and when bonding with the base substrate layer 50, dry with hot air at 70 ~ 150℃ for bonding, or partially dry at 70 ~ 150°C before bonding with the base substrate layer 50 There is a method of bonding with the base substrate layer 50 by matching the adhesive point of the sea bran water-based adhesive layer, and curing it with hot air at 80 to 150°C. After bonding, in order to obtain complete adhesion, it is allowed to stand for 5 to 24 hours in the aging room at 70 to 100°C to induce a sufficient curing reaction.

In the step of forming the base substrate layer 50 (S40), the base substrate layer 50 is formed under the print layer 30.

Thereafter, the step of forming the surface treatment layer 10 (S50) is to form the surface treatment layer 10 by applying a water-based polymer resin on the skin film layer 20.

The above step is preferably performed after the step of manufacturing the skin film layer 20 (S10) or after the step of forming the base substrate layer 50 (S40).

3 is a photograph of the surface of a polyester artificial leather sheet in a state in which the lighting device is not turned on, and FIG. 4 is a photograph of the surface of the polyester artificial leather sheet in a state in which the lighting device is turned on.

3 to 4, according to the polyester artificial leather having a light-transmitting function of the present invention and a method for manufacturing the same, fine pores are not formed in the polyester copolymer according to the present invention, so that the light-transmitting function is improved. In the absence, it exhibits the same aesthetic effect as natural leather. In particular, when the lighting device is illuminated on the back side, the light transmittance is remarkably improved compared to the case where a pigment that transmits light through optical action is mixed with a conventional polyurethane resin. A clearer and clearer display is possible in the optical expression of letters.

In addition, the present invention is light-transmitting and at the same time excellent in deformability, durability, light resistance, weather resistance, and chemical resistance, so that it can be used for automobile interior materials, interior materials, home appliance skins, and the like.

Table 1 below is a comparative example, in order to compare the transmittance according to the present invention, as a comparative example, but instead of the polyether ester-based copolymer in the step (S10) of preparing the skin film layer 20 Polyurethane was prepared and the transmittance was measured. 5 is a cross-sectional photograph of a polyether ester-based copolymer used in the skin film layer according to an embodiment of the present invention, and FIG. 6 is a cross-sectional photograph of a conventional polyurethane resin used in the skin film layer.

division The present invention Comparative example Material of skin film layer Polyether ester system
Copolymer Polyurethane Micropore size No micropore About 150㎛ horizontal, about 55㎛ vertical Total light transmittance (%)
(Tt: Total Transmitted Light) 1.2 0

As shown in Table 1, in the case of a skin film layer in which a pigment is mixed with polyurethane, micropores are formed and the transmittance is very low, whereas in the case of the present invention, the transmittance is 1.2%, which shows a relatively excellent transmittance.

On the other hand, the above detailed description should not be construed as restrictive in all respects and should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

10: surface treatment layer 20: skin film layer
30: printing layer 40: adhesive layer
50: base substrate layer

Claims (12)

A skin film layer comprising a polyether ester-based copolymer;
A printing layer in which a specific letter or shape is printed on one surface of the skin film layer; And
Including; a base substrate layer formed under the printing layer and mixed with the printing layer,
The skin film layer is obtained by dispersing and mixing fine spherical particles formed by pulverizing together a powder, an additive, and a pigment in a polyether ester-based copolymer prepared by condensation polymerization of terephthalic acid, 1,4 butanediol and polytetramethylene glycol. Polyester artificial leather with a characteristic light-transmitting function.
The method of claim 1,
Polyester artificial leather having a light-transmitting function further comprising; an adhesive layer formed by coating a water-based polyurethane-based polymer resin or a water-based polyester-based polymer resin on one side of the printing layer and bonding the base substrate layer and the print layer.
The method of claim 1,
A polyester artificial leather having a light-transmitting function further comprising; a surface treatment layer formed by coating a water-based polymer resin on the upper portion of the skin film layer.
The method of claim 1,
The light-transmitting pigment is a polyester artificial leather having a light-transmitting function, characterized in that 0.1 to 2.0% by weight.
The method of claim 1,
Polyester artificial leather having a light-transmitting function, characterized in that the thickness of the skin film layer is 100 ~ 250 ㎛.
The method of claim 1,
The polyether ester copolymer has a melting point (Tm) of 150 to 190°C, a hardness of 20 to 30D (SHORE D hardness tester), a melt flow index (MI) of 10 to 50 g/10min (220°C/2.16 kg) and a recovery rate (RESILIENCE) ) Polyester artificial leather having a light-transmitting function, characterized in that 50 to 80%.
Preparing a skin film layer;
Forming a print layer in which a specific letter or shape is printed on one surface of the skin film layer; And
Including; forming a base substrate layer under the print layer,
The step of preparing the skin film layer,
Preparing a polyether ester-based copolymer by condensation polymerization of terephthalic acid, 1,4 butanediol, and polytetramethylene glycol; And
A method for producing a polyester artificial leather having a light-transmitting function comprising: dispersing and mixing fine spherical particles formed by pulverizing the polyether ester-based copolymer with powder, additives and pigments to prepare a film layer.
The method of claim 7,
After the step of forming the printing layer,
Applying a water-based polyurethane-based polymer resin or a water-based polyester-based polymer resin on one surface of the printing layer to form an adhesive layer bonding the base substrate layer and the printing layer; of a polyester artificial leather having a light-transmitting function further comprising Manufacturing method.
The method of claim 7,
The method of manufacturing a polyester artificial leather having a light-transmitting function further comprising a step of forming a surface treatment layer by applying a water-based polymer resin on the upper portion of the skin film layer.
The method of claim 7,
The light-transmitting pigment is a method for producing a polyester artificial leather having a light-transmitting function, characterized in that 0.1 to 2.0% by weight.
The method of claim 7,
The method of manufacturing a polyester artificial leather having a light-transmitting function, characterized in that the thickness of the skin film layer is 100 ~ 250 ㎛.
The method of claim 7,
The polyether ester copolymer has a melting point (Tm) of 150 to 190°C, a hardness of 20 to 30D (SHORE D hardness tester), a melt flow index (MI) of 10 to 50 g/10min (220°C/2.16 kg) and a recovery rate (RESILIENCE) ) A method for producing a polyester artificial leather having a light-transmitting function, characterized in that 50 to 80%.

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