KR20230001118A - Skin Layer Composition For Synthetic Leather, Synthetic Leather Using The Same, And Method For Manufacturing Synthetic Leather - Google Patents

Abstract

Disclosed are a synthetic leather skin composition forming a skin layer of a synthetic leather fabric, a synthetic leather using the same, and a manufacturing method thereof. The synthetic leather skin composition comprises: polyurethane dispersion (PUD); tree powder which is mixed with the PUD; and a pigment which is mixed with the PUD along with the tree powder to express colors of the synthetic leather fabric. The present invention: can manufacture an eco-friendly synthetic leather using tree powder and PUD; is capable of reducing weight of synthetic leather, and uses natural fiber-reinforced polymer composites to improve biodegradability; in the case of paper mulberry powders or kenaf powders; enables manufacturing of synthetic leather with more excellent antibacterial properties; and ensures carbon emission rights through tree cultivation for obtaining tree powders.

Description

Synthetic leather skin composition and synthetic leather and synthetic leather manufacturing method using the same {Skin Layer Composition For Synthetic Leather, Synthetic Leather Using The Same, And Method For Manufacturing Synthetic Leather}

The present invention relates to a synthetic leather skin composition and synthetic leather and synthetic leather manufacturing method using the same, and more particularly, to a synthetic leather skin composition containing wood powder (wood powder) and synthetic leather and synthetic leather manufacturing method using the same .

In general, leather is a product manufactured through depilation and tanning of skin (raw hide) peeled off from animals, and is obtained from various animals such as crocodiles and lizards as well as mammals such as cows, sheep, goats, horses, pigs, and deer. The obtained skin (shell) is used as a leather material.

Examples of the above-mentioned tanning include chrome tanning, plant tanning, oil tanning, aluminum tanning, and the like, and leather products produced by chrome tanning are known to be the most common.

As described above, leather manufactured using animal skin, that is, animal leather, is called natural leather, and synthetic leather, artificial leather, which is artificially manufactured as a concept relative to natural leather, is a leather substitute (Synthetic Leather, Artificial Leather) It has been developed and used as a substitute for natural leather.

The above-mentioned natural leather is a material that has been loved by people for a long time because of its tough yet soft texture, but as the social atmosphere of animal protection spreads, the number of people who feel reluctance to use natural leather is increasing. In addition, the synthetic leather is cheap and can be applied to various fields, but the problem of environmental pollution has been raised.

The synthetic leather is a type of artificial leather and was developed to replace real leather, that is, natural leather, and is used as a coating or surface material for various products such as automobile seats, bags, wallets, medical materials, and interior materials.

The synthetic leather is a leather made similar to natural leather by layering a plastic layer constituting the skin of synthetic leather on a basic cloth such as cotton or chemical fiber using a polymer compound such as polyurethane as a main raw material, and is tough and trimmed. Since it is easy to do, it is used as a material in various fields, such as a material for household or fashion products such as bags, wallets, and belts, furniture covering materials such as sofas, wall materials or flooring materials, medical materials, and various interior materials such as automobile interior materials.

In recent years, vegetable leather (plant leather) has been commercialized as a new concept of alternative leather that replaces natural leather, that is, a leather substitute, and food made similar to meat by using vegetable meat as a raw material, that is, using vegetable raw materials to produce meat. As it means alternative meat made to feel the taste and texture, the vegetable leather is a fabric (batangji) manufactured using raw materials derived from plants, more specifically, similar leather using a fabric having a cellulose material, that is, an alternative As leather, it refers to leather substitutes (also called 'leather substitutes') that are manufactured using plants.

Examples of vegetable leather materials using cellulose-based fabrics include vegetable leather manufactured using fibers extracted from pineapple leaves or skins (product name: Pinatex, manufacturer: Ananas Anam, UK), and paper mulberry bark, a raw material of Korean paper. Vegetable leather (product name: Haunji, manufacturer: Hanwon Mulsan, Korea), vegetable leather made using mushroom mycelium (product name: Mylo, manufacturer: Bolt Threads, USA), and grape skins, stems, and seeds discarded after making wine. There are various types of products such as vegetable leather (product name: Wineleather, manufacturer: Vegea, Italy), and alternative leather manufactured using plants, that is, vegetable substitute leather, is collectively referred to as vegetable leather.

Among the above-mentioned vegetable leathers, the technique of manufacturing natural vegetable leather after laminating Korean paper using paper mulberry with fabric (fibers such as cotton, hemp, and wool) is registered in Patent No. 10-1524417 (Korean paper in rolls and A fabric manufacturing method in which fabrics are laminated) is disclosed.

And Patent Registration No. 10-1228351 (Fabric using Korean paper impregnated with synthetic resin and its manufacturing method) discloses an invention for manufacturing fabric by impregnating synthetic resin such as polyurethane, polypropylene, polyethylene, polyvinyl chloride, urea, etc. into Korean paper. has been initiated. For reference, Figure 1 is a photograph showing a vegetable leather material in the form of laminating paper mulberry paper to fabric.

As described above, in recent years, leather substitutes (replacement leather) such as synthetic leather and vegetable leather have been used along with natural leather, but animal leather has a problem in terms of animal protection, and synthetic leather (synthetic leather such as PVC and PU) Leather) has been raised as a problem of environmental pollution when discarded after use.

Korea Patent Registration No. 10-1171634, synthetic leather, registered on July 27, 2012 Korean Patent Registration No. 10-2227625, synthetic leather with excellent elongation and sound absorption performance, registered on March 9, 2021 Korean Registered Patent Publication No. 10-1524417, registered on May 22, 2015, manufacturing method of fabric combining Korean paper and fabric in rolls to facilitate mass production

An object of the present invention is to provide a plant material-based synthetic leather skin composition that can be lightweight and has excellent biodegradability, and a synthetic leather and synthetic leather manufacturing method using the same.

One aspect of the present invention is a synthetic leather skin composition for forming a skin layer of synthetic leather fabric: Polyurethane Dispersion (PUD); Wood powder mixed with the water-dispersed polyurethane; And to implement the color of the synthetic leather fabric, it provides a synthetic leather skin composition containing a pigment mixed with the water-dispersed polyurethane together with the wood powder.

The wood powder may have a particle size of 1 μm to 200 μm, more specifically, a particle size of 150 μm or less. The synthetic leather skin composition may include, but is limited to, 20 to 98.9% by weight of the water-dispersed polyurethane, 1 to 30% by weight of the wood powder, and 0.1 to 50% by weight of the pigment, based on the total weight of the composition. It is not. More specifically, the wood powder may be contained in the composition in an amount of 5 to 20% by weight, but is not limited thereto.

Another form of the present invention is: a cloth (Fabric) forming the base of synthetic leather fabric; In addition, synthetic leather including a fabric skin formed on one side of the cloth by the above-described synthetic leather skin composition, that is, synthetic leather using wood powder is provided.

The synthetic leather; It may further include a leather texture surface coating film formed by coating a surface coating agent (leather texture composition) in which polyurethane beads and water-dispersed polyurethane having a particle size of 100 nm to 1500 nm are mixed.

Another aspect of the present invention is: (a) forming a fabric skin by coating the above-described synthetic leather skin composition on one side of a release paper; and (b) step of applying an adhesive to the surface of the fabric skin and laminating a fabric forming the base of the synthetic leather fabric with the fabric skin.

The synthetic leather manufacturing method: Before the step (a), in order to form a leather texture coating film between the release paper and the fabric surface, water-dispersed polyurethane having a particle size of 100 nm to 1500 nm is included on one side of the release paper. It may further include the step (c) of coating the leather texture composition.

After laminating the fabric and the skin of the fabric, a step of separating the release paper from the synthetic leather fabric having the skin of the fabric is performed.

The present invention can realize eco-friendly synthetic leather using wood powder and water-dispersed polyurethane, it is possible to reduce the weight of synthetic leather, and biodegradability is improved by using natural fiber-reinforced polymer composites (NFRP). In the case of paper mulberry powder or kenaf powder, it is possible to implement synthetic leather with better antibacterial properties, and carbon emission rights can be secured through the cultivation of trees to obtain wood powder.

The features and advantages of the present invention may be better understood with reference to the following drawings in conjunction with the detailed description of embodiments of the present invention, of which:
1 is a view schematically showing an embodiment of a synthetic leather fabric using a synthetic leather skin composition according to the present invention;
Figure 2 is a view schematically showing a manufacturing process of the synthetic leather fabric shown in Figure 1;
3 is a view schematically showing another embodiment of a synthetic leather fabric using a synthetic leather skin composition according to the present invention;
Figure 4 is a view schematically showing a manufacturing process of the synthetic leather fabric shown in Figure 3; And
5 is a photograph of a synthetic leather fabric manufactured according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention in which the object of the present invention can be realized in detail will be described with reference to the accompanying drawings. In describing the present embodiments, the same names and the same reference numerals are used for the same components, and additional descriptions thereof are omitted below.

Terms used in this specification are used to describe embodiments of the present invention and are not intended to limit the present invention, and certain components are “applied” or “attached” to other components. When it is referred to as "coated", it may be directly applied, attached, or coated to the other component, but it should be understood that it also includes a coupling relationship in which another component exists in the middle, that is, an indirect coupling relationship.

In this specification, terms such as "include" or "have" mean that features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, and that one or more other features are present. However, it should be understood that the existence of numbers, steps, operations, components, parts, or combinations thereof, i.e., the possibility of addition is not excluded.

First, with reference to FIGS. 1 and 2, an embodiment of the synthetic leather skin composition according to the present invention and synthetic leather and synthetic leather manufacturing method using the same will be described.

One embodiment of the synthetic leather skin composition (hereinafter referred to as 'skin composition') according to the present invention is a composition for forming a skin layer of synthetic leather fabric. The skin composition includes polyurethane dispersion (PUD), and wood powder and a pigment mixed with the polyurethane dispersion.

The water-dispersed polyurethane includes a polyester type and a polyether type depending on the type of polyol used. For example, one embodiment of the present invention is a polyester polyol. and polyether polyol polymerized water-dispersed polyurethane (hereinafter, abbreviated as 'PUD').

By polymerization of the above-mentioned polyester polyol and polyether polyol, the PUD contains a solid content of 20% to 60%, for example, a solid content of 30 to 60%, more specifically, a PUD with a solid content of 30 to 40% Although it may be applied to the present embodiment, the solid content of the PUD applicable to the present invention is not limited thereto.

The method of manufacturing the PUD itself is known, and includes a prepolymer manufacturing step of preparing a prepolymer, and a neutralization step of introducing a neutralizing agent into the prepolymer.

For example, the prepolymer reacts a material that provides an ionic group that enables water dispersion in water, such as polyester polyol, polyether polyol (Polyol), and dimethylol propionic acid (DMPA). It can be manufactured through the process of making.

For reference, the polyol is largely classified into polyester polyol, polyether polyol, and polycarbonate polyol. Examples of solvents used in the prepolymer reaction include NMP (N-methylpyrrolidinone) and acetone. Since the manufacturing method of the PUD described above is well known, an additional description thereof is omitted.

Examples of commercially available water-dispersion polyurethane (PUD) products include various products such as Covestro's Impranil DLP-R, DLU, DLH, and DLC-T.

In addition, the wood powder (Wood Flour) is also called wood flour, and refers to powder made by grinding wood. Currently, various types of wood flour are sold on the market, and an embodiment of the present invention is wood flour mainly used as a heat insulating material or a building material. By using as a synthetic leather manufacturing material, eco-friendly and lightweight synthetic leather can be realized.

In the present specification, eco-friendly synthetic leather can be manufactured using wood flour, and a composition using biocomposite materials (NFRP; Natural Fiber-Reinforced Polymer Composites) that forms the skin layer of synthetic leather fabric, synthetic leather using the same, and The manufacturing method is disclosed.

More specific examples of the wood powder (wood powder) include mulberry powder (paper mulberry powder), which is a raw material of Korean paper, kenaf powder made of kenaf, oak powder (oak powder), etc. Various and limited to specific wood powder It doesn't work. However, in the case of paper mulberry powder or kenaf powder, it is possible to implement synthetic leather with better antibacterial properties. Examples of commercially available wood flour products include various products such as JRS' Lignocel C120.

The pigment is mixed with the PUD together with the wood powder, and the pigment is a component material for realizing the color of the synthetic leather fabric.

Organic pigments and inorganic pigments may be used as the pigment, and as the organic pigment, CI Pigment Red (CI Pigment Red 48:1, 48:2, 48:3, 48:4, 53:1, 53:2, 57:1), CI Pigment Yellow 1, 3, 83, CI Pigment Orange 16, CI Pigment Blue 15:3, 15:6, CI Pigment Blue 15:3, 15:6 Pigment Green 7 (CI Pigment Green 7), Anthraquinone (Indanthrene Blue C.I. Pigment Blue 60), Thioindigo (Thioindigo Magenta C.I. Pigment Vilot38), Perinone Orange (C.I. Pigment Orange 43), Perylene Maroon (Perylene Maroon) C.I. Pigment Red 179), Quinacridone Red C.I. Pigment Violet 19, C.I. Pigment Red 177, Carbon Black Pigment (CI Pigment Black 7), and CI Pigment Green 36 36) and other organic pigments. As the inorganic pigment, titanium dioxide (CI Pigment white 6) exhibiting a white color may be used.

Since the pigment itself is a known material, additional description of the pigment itself is omitted.

The wood powder for an embodiment of the present invention may have a particle size of 1 μm to 200 μm, more specifically, a particle size of 150 μm or less, for example, 50 to 150 μm.

If the wood powder is a large particle exceeding 200㎛, it is difficult to apply cleanly during the coating operation, so a small particle, for example, 150㎛ or less is preferable, but considering the viscosity of the skin composition or difficulty in manufacturing, 20㎛ or more Wood powder may be used, but is not limited thereto.

The skin composition may include 20 to 98.9% by weight of the water-dispersed polyurethane, 1 to 30% by weight of the wood powder, and 0.1 to 50% by weight of the pigment, based on the total weight of the composition (based on 100). It is not limited. Regarding the above-mentioned water-dispersed polyurethane content, if the wood powder is less than 1% by weight, it is difficult to satisfy light weight or eco-friendliness, and if it exceeds 30% by weight, the viscosity of the synthetic leather skin composition may increase, making coating difficult. More specifically, the wood powder may be contained in an amount of 5 to 20% by weight in the skin composition, but is not limited thereto.

Referring to Figure 1, one embodiment (first embodiment) of the synthetic leather according to the present invention, the fabric (10; Fabric) constituting the base layer of the synthetic leather fabric, and the above-described skin composition Synthetic leather including a fabric skin 20 formed on one side of the cloth, that is, artificial leather using wood powder, is an alternative leather material. Of course, the fabric skin 20 may have a structure covered by a surface coating film, for example, a leather texture surface coating film, as in an embodiment described later.

The cloth 10 may be in the form of a fabric or non-woven fabric, and may be made of, for example, a cotton material called shading. In addition, the cloth 10 and the fabric skin 20 may be formed in a laminated structure by an adhesive 30, that is, an integrated structure in an overlapping state.

The first embodiment of the above-described synthetic leather may be manufactured by one embodiment of the following synthetic leather manufacturing method.

Referring to FIG. 2, in the synthetic leather manufacturing method according to an embodiment of the present invention, the above-described skin composition is coated on one side of a release paper (1; Release Paper) to form a fabric skin 20 (a) step ( (S10) and (b) step (S20) of applying the adhesive 30 to the surface of the fabric skin 20 and laminating the base paper of the synthetic leather fabric, that is, the above-described cloth 10 with the fabric skin 20 includes

More specifically, the (a) step (S10) is a step of drying the skin composition after applying the skin composition to a thickness of 200 to 400 μm on the surface of the release paper (1). As an example of the drying conditions, drying may be performed for 2 to 5 minutes in a dry oven at about 130 to 160 ° C., but is not limited thereto, and a person skilled in the art (ordinary technician) It goes without saying that the drying conditions can be variously changed.

And the step (b) (S20) is the step of applying the adhesive 30 on the coating layer formed by the above-described skin composition, that is, the fabric skin 20, and placing the cloth 10 on the adhesive 30 A lamination (combining) step of integrating the fabric 10 and the fabric skin 20 by an adhesive method is included. Accordingly, a synthetic leather fabric having a skin layer, that is, a fabric skin, made of the above-described skin composition may be formed on one side of the release paper 1.

As the adhesive 30, a water-based adhesive is good in consideration of eco-friendliness, and the water-based adhesive may be a water-dispersed polyurethane type using polyether polyol or polyester polyol, but is not limited thereto. . Examples of commercially available water-based adhesives include Lamberti's Rolflex HD17, DAK 07, and ADT 7, which are applied to one side of the fabric skin in an amount of about 80 to 100 μm, but the thickness of the adhesive is not limited thereto. no.

After laminating the fabric 10 and the fabric skin 20, a step of separating the release paper 1 from the synthetic leather fabric having the fabric skin is performed. The release paper 1 is various, such as a product of LINTEC, Japan.

Referring to Figure 3, another embodiment (second embodiment) of the synthetic leather according to the present invention according to the present invention, the fabric (10; Fabric) forming the base layer of the synthetic leather fabric, and the above-described It includes a fabric skin 20 formed on one side of the fabric 10 by the skin composition, and a surface coating film 40 covering the fabric skin 30.

Since the contents described in the above-described first embodiment may be equally applied to the remaining components except for the surface coating layer 40, repeated description is omitted.

In this embodiment, the surface coating film 40 is a leather texture surface coating film formed by coating of water-dispersed polyurethane mixed with polyurethane beads, more specifically, polyurethane beads and particle size of 100 nm to 1500 nm It may consist of a leather texture surface coating film formed by a surface coating agent mixed with water-dispersed polyurethane. That is, the surface coating film can impart a texture similar to that of natural leather to the synthetic leather fabric.

The surface coating film 40 may be formed by a surface coating composition, that is, a leather texture composition, and examples of the leather texture composition are as follows.

The leather texture composition includes PUD (Polyurethane Dispersion) as a surface coating material for forming a natural leather texture on the surface of synthetic leather.

In the water-dispersed polyurethane of the leather texture composition, by polymerization of polyester polyol and polyether polyol, the PUD contains a solid content of from the late 20% to the early and mid-60%, for example, 30 to 60% solid content, more specific examples 35% of PUD may be applied to this embodiment, but the solid content of PUD is not limited thereto.

For reference, natural leather can be classified into aniline leather and pigment leather according to the processing method, and the aniline leather is classified into full aniline leather and semi aniline leather. can be classified.

The above-mentioned full aniline leather is leather that is dyed with aniline dyeing agent for the highest grade raw hide with few scars or scratches on the surface of the leather, and is the highest quality leather with a smooth and slippery texture. It is recognized as the best leather because the inside and outside are dyed in the same color, so the surface of the leather does not have cracks or cracks, it is very soft, and pores and wrinkles remain as they are.

In addition, the semi-aniline leather is mainly used for the next grade of the highest-grade raw hide used as full aniline leather among raw hides, and after dyeing the hide using a dye, the surface is As dyed leather, this also belongs to high-quality leather.

The Pigment 　 Leather is a leather whose surface is finished with a pigment to hide flaws such as wrinkles, scars, insect bites, etc. on the surface of the raw hide and to give a uniform color. There is a downside that the softness is low and the pores or wrinkles are not clear.

The leather texture composition for this embodiment can implement a soft surface texture (soft texture), and further implement a slippery and smooth surface texture. In the leather texture composition, PUD forms a soft texture, which is the texture of high-quality/high-end natural leather, on the surface of an alternative leather material, and in this embodiment, the leather texture composition includes PUD having a particle size of 100 nm to 1500 nm. .

Natural leather appears semi-glossy or matte in terms of gloss, but if the particle size of the PUD contained in the leather texture composition, that is, the particle size of the solid content is less than 100 nm, it can appear glossy, and also improves soft touch at 100 nm or more let it In addition, it is difficult to implement the particle size of the PUD larger than 1500 nm, and the particle size of the PUD is usually prepared within 1500 nm in the synthesis of water-dispersed polyurethane.

More preferably, it is preferable to use a PUD having a particle size of 300 nm to 1000 nm for forming a surface coating film, and a particle size of 300 nm to 1000 nm, for example, an average particle size in the range of 300 nm to 1000 nm. The surface gloss can be more excellently implemented like natural leather, and the touch can also be implemented more smoothly like natural leather.

In other words, a leather texture composition containing PUD having a particle size of 100 nm (0.1 micron) or more, preferably 300 nm or more, can implement a smooth surface texture close to that of natural leather.

Examples of PUD that can be commercially applied to the leather texture composition according to the present embodiment include products provided by Stahl (eg, Relca PD-802, Relca PD-804), and the like. Of course, it can be, but is not limited thereto.

The leather texture composition may further include polyurethane beads mixed with the water-dispersed polyurethane to enhance a soft surface feel like natural leather. The polyurethane beads (PU beads) are auxiliary agents for enhancing soft surface feel, and preferably have an average particle size of 1 μm to 15 μm, but are not necessarily limited thereto.

In other words, in order to further enhance softness, the polyurethane beads may be added to the PUD, and the polyurethane beads may have a particle size (particle size) of 1 to 15 μm (microns).

If the particle size of the polyurethane beads is less than 1 micron, it is difficult to impart a soft surface touch by the polyurethane beads themselves to the leather texture coating film 200, and if the particle size exceeds 15 microns, the surface is not smooth, and rather, a bumpy rough feeling is reduced. can More preferably, polyurethane beads having an average particle size of 1 μm to 10 μm are good for adding smooth surface properties.

In this embodiment, based on 100 parts by weight of the water-dispersed polyurethane, 0 to 40 parts by weight of the polyurethane beads may be contained in the leather texture composition, but is not limited thereto.

When the polyurethane beads exceed the above-mentioned range, the feel of the polyurethane beads becomes more prominent than the texture (soft feel) implemented by the water-dispersed polyurethane. Although the polyurethane beads may exhibit a soft touch (soft touch), if the polyurethane beads exceed the above-described range, they may exhibit a rather hard touch beyond the touch due to the water-dispersed polyurethane. In addition, the polyurethane beads are in the form of particles, and may reduce surface coating power (surface adhesion) when excessively applied.

In addition, the leather texture composition may further include at least one texture adjuvant selected from the group consisting of silicone additives, silicone beads, and wax for a smooth texture.

That is, the leather texture composition may further include at least one material selected from the group consisting of the aforementioned polyurethane beads, silicone additives, silicone beads, and wax.

The silicone additive, silicone beads, and wax can impart a smooth touch (or smooth touch) by lowering the surface friction coefficient so that the surface texture of natural leather can be realized.

As described above, according to the leather texture composition containing PUD, polyurethane beads, silicone additives, silicone beads, and wax, the soft and smooth surface characteristics of natural leather can be implemented.

Therefore, in order to impart a smooth texture to the surface of the alternative leather material, a silicone additive is additionally added to the leather texture composition, or silicone beads or wax having a particle size of 1 μm to 15 μm among organic beads having a low surface friction coefficient are contained. By lowering the surface friction coefficient, it is possible to implement a smooth surface texture. In the case of the silicon beads or wax, a particle size, more specifically, an average particle size of 1 μm to 10 μm is good for implementing smoother surface characteristics.

Examples of commercially available silicone additives include, but are not limited to, Dowcorning's Dowsil 5-7222 Emulsion (High Molecular Weight special silicone emulsion Type) and Dowsil 2-8818 (Aminofunctional silicones Type). .

Examples of commercially available silicon beads include Momentive's Tospearl 120FL and 130FL, but are not limited to the above examples.

Examples of the wax include polytetrafluoroethylene (PTFE) wax and amide-based WAX, but the example of the wax is not limited thereto.

In this embodiment, based on 100 parts by weight of the PUD, the texture adjuvant may be contained in an amount of 0 to 60 parts by weight, but is not limited thereto. More specifically, based on 100 parts by weight of the PUD, the silicone additive may be contained in an amount of 0 to 20 parts by weight, and at least one of the silicone beads and wax may be contained in an amount of 0 to 40 parts by weight.

When the silicone additive exceeds the above-mentioned range, the surface adhesion of the composition according to the present invention may decrease, and when the silicone beads or wax exceed the above-mentioned range, the surface adhesion and texture due to the water-dispersed polyurethane itself decrease. may have an adverse effect.

In addition, the leather texture composition according to the present embodiment may contain a predetermined amount of at least one additive selected from the group consisting of an antifoaming agent, a stabilizer (heat stabilizer, light stabilizer), a leveling agent, and an antioxidant. Since the type or content of the above-mentioned additives can be adjusted as needed by those skilled in the art, additional descriptions will be omitted.

The PUD of the leather texture composition may be mixed with a solvent, such as water, more specifically, distilled water, and a co-solvent (eg, alcohol solvent) may be added. That is, the PUD may be mixed with a solvent such as water or a cosolvent.

The co-solvent may be used in an appropriate amount to control dryness, prevent freezing in winter, and adjust the Minimum Film Forming Temperature (MFFT) of the resin. In general, alcohol solvents such as ethanol or isopropyl alcohol and DEG ( Cosolvents such as glycols such as Diethyleyne glycol and PG (Propylene Glycol) are used.

In the leather texture composition, based on 100 parts by weight of PUD, the solvent may be contained in an amount of 0 to 280 parts by weight, but is not limited thereto. More specifically, based on 100 parts by weight of the PUD, the water may be contained in an amount of 0 to 230 parts by weight, and the cosolvent may be contained in an amount of 0 to 50 parts by weight.

A more specific example of the leather texture composition according to the present invention is, based on the total weight of the composition (100% by weight of the leather texture composition), 30 to 50% by weight of PUD, 0 to 10% by weight of polyurethane beads, and 0 to 15% by weight of texture adjuvant %, antifoaming agent 0.1 to 2% by weight, stabilizer (heat stabilizer, light stabilizer) 0.1 to 5% by weight, leveling agent 0.1 to 2% by weight, antioxidant 0.1 to 2% by weight, and the remaining amount of solvent. For example, as the solvent, 0 to 67% by weight of water (distilled water) and 0 to 15% by weight of a co-solvent (alcoholic solvent) may be included.

In this embodiment, the PUD having a solid content of 35% is exemplified, but not limited thereto, as described above. In addition, the texture adjuvant may include 0 to 5% by weight of a silicone additive and 0 to 10% by weight of a silicone bead or wax based on 100% by weight of the leather texture composition.

In addition, an example of a leather texture composition including both the polyurethane beads and the texture adjuvant described above is 30 to 50% by weight of PUD, 1 to 10% by weight of polyurethane beads, 0.5 to 5% by weight of silicone additives, silicone beads and / Alternatively, 1 to 10 wt% of wax, 0.1 to 2 wt% of antifoaming agent, 0.1 to 2 wt% of heat stabilizer, 0.1 to 2 wt% of light stabilizer, 0.1 to 2 wt% of leveling agent, 0.1 to 2 wt% of antioxidant, water (distilled water) ) 0 to 67% by weight, and 0 to 15% by weight of a cosolvent (alcoholic solvent), and accordingly, an alternative leather product having a soft and smooth surface texture and gloss like a natural leather product can be implemented.

When the PU beads (polyurethane beads), silicone additives, and silicone beads/wax are contained in the composition within the above range, the texture (soft touch) and smooth texture of the water-dispersed polyurethane itself on the surface of the substitute leather are natural leather At the same time, the surface adhesion of the leather texture composition according to the present invention can be secured.

Referring to FIG. 4, in the synthetic leather manufacturing method for the second embodiment described above, step (a) of forming a fabric skin 20 by coating the above-described skin composition on one side of a release paper (1; Release Paper) ( (S10) and (b) step (S20) of applying the adhesive 30 to the surface of the fabric skin 20 and laminating the base paper of the synthetic leather fabric, that is, the above-described cloth 10 with the fabric skin 20 Including, before the step (a), in order to form a leather texture coating film between the release paper and the fabric surface, a water-dispersed polyurethane having a particle size of 100 nm to 1500 nm is included on one side of the release paper (1). It further comprises the step (c) of coating the leather texture composition.

That is, the present embodiment includes the steps of forming a surface coating film 40 by coating a leather texture composition on one side of a release paper, forming a fabric skin 20 by coating a skin composition on the surface coating film 40, and an adhesive ( 30), including the step of laminating the fabric 10 and the fabric skin 20, and separating the release paper 10 from the synthetic leather fabric having the surface coating film after laminating the fabric and the fabric skin is carried out

The surface coating film 40 may be formed by applying the leather texture composition on the release paper 1 and then drying in a dry oven at 130 to 160° C. for 90 to 120 seconds (sec). Since the process after the formation of the surface coating film can be applied in the same manner as described in the manufacturing method of the first embodiment described above, repeated description will be omitted. 5 is a photograph showing the synthetic leather according to the second embodiment, and a surface photograph of the synthetic leather using black pigment.

Hereinafter, manufacturing examples of the fabric skin according to the present invention will be described, and the following specific examples are only exemplified to explain the present invention, and the present invention is not limited to the following examples.

As follows, using the skin composition containing the components described in [Table 1], the fabric skin of the synthetic leather according to Example 1 and Comparative Example 1 was formed and laminated with cotton cloth (Cotton). A water-based adhesive (Rolflex HD17 from Lamberti) was used for lamination of the cotton cloth and the skin of the fabric.

division Example 1 Comparative Example 1 note PUD 82 Impranil DLH, 40% solids
Specific Gravity 1.1 wood flour 15 0 Lignocel C120, particle size 70~150㎛
Bulk density 100~135 g/L pigment 3 Carbon Black 40L (Korea Carbon Black)
Specific gravity 1.7 - 1.9 TOTAL 100 100

After applying the skin composition according to Example 1 and Comparative Example 1 above to release paper (LINTEC, Grade: PXDH Release Paper), dry (drying conditions: drying in a dry oven at 150 ° C for 4 minutes (Min)) to obtain a dry film of 150 μm [Table 2] shows the amount of the skin composition (amount of coating liquid) required for coating a 1 m2 area of fabric (coating area 1 m2) when forming a thick fabric skin.

division Example 1 Comparative Example 1 Solid content (%) 50.8 41.8 Specific gravity of coating solution 0.92 1.04 Specific gravity of solvent (solvent: water) One One Solid content volume ratio 54.7 39.5 Amount of coating liquid required to apply 1㎡ area (kg) 0.252 0.395

The solid volume ratio (SVR: Solid Volume Ratio) of Example 1 and Comparative Example 1 can be calculated by [Equation 1] below, and when forming a fabric skin with a dry film thickness of 150 μm on the fabric, 1 m2 of fabric is applied ( The amount of skin composition (coating liquid amount) required for the coating area 1 m2) can be calculated by the following [Equation 2].

As described in [Table 2], in order to form a fabric skin with a dry film thickness of 150 μm in an area of 1 m2, in the case of Example 1, 0.252 kg is required, and in the case of Comparative Example 1, it can be confirmed that 0.395 kg is required. , In the case of Example 1, the amount of coating solution used (amount of coating solution) can be reduced by about 36% compared to Comparative Example 1.

And after forming a surface coating film on the release paper using a coating composition (surface coating agent) containing the components listed in [Table 3] below, a fabric skin was formed with the skin composition described in [Table 1] thereon, and the fabric skin A synthetic leather fabric was prepared by combining cotton and cotton with a water-based adhesive.

division Comparative Example 1 Example 1 note PUD
Impranil DLP-R 50
Poyester polyol Type (50% solid content),
Particle size less than 50 ㎚, manufacturer: Covestro PUD
Relca PD-804 50
Polyether polyol Type (solid content 35%),
Particle size greater than 300 nm, manufacturer: Stahl Distilled water 27.5
27.5
Joongjae
(ethanol) 5
5
PU bead
7SC 8
8
Particle size 7~8㎛ (micron)
Manufacturer: Lamberti silicone additives
Dowsil 5-7222 Emulsion 2
2
High Molecular Weight special silicone emulsion
Manufacturer: Dowcorning silicone bead
Tospearl 145FL 5
5
Particle size 4-5 microns
Manufacturer: Momentive heat stabilizer
Tinuvin 1130 0.5 0.5 Heat stabilizer and light stabilizer
Manufacturer: BASF light stabilizer
Tinuvin 123-DW 0.5
0.5
Manufacturer: BASF antifoam
Foamex 825 0.5
0.5
Manufacturer: Tego leveling agent
BYK-346 0.5
0.5
Manufacturer: BYK antioxidant
Irganox 245 0.5
0.5
Manufacturer: BASF TOTAL 100 100

Referring to [Table 3], when compared with the coating composition of Example 1, the coating composition of Comparative Example 1 is a composition based on PUD having a particle size of 50 nm or less, and Example 1 contains a PUD having a particle size of 300 nm or more. It is a coating composition.

The results of testing the surface texture (touch) of the product having the surface coating film according to Example 1 and Comparative Example 1 described above were shown in [Table 4].

division Comparative Example 1
Example 1
surface texture
degree of softness 2
5
surface texture
degree of smoothness 4
5

In the surface feel test results, the softness and smoothness were each classified into 5 levels (grades 1 to 5), and the higher the number in the softness, the better the softness, and the higher the number, the better the smoothness. indicates

Referring to [Table 4], it can be seen that Example 1 shows very good surface feel characteristics in both softness and smoothness, but Comparative Example 1 has a inferior surface feel compared to Example 1.

As described above, the preferred embodiments according to the present invention have been reviewed, and the fact that the present invention can be embodied in other specific forms without departing from the spirit or scope in addition to the above-described embodiments requires those skilled in the art. It is self-evident to them.

Therefore, the embodiments described above should be regarded as illustrative rather than restrictive, and thus the present invention is not limited to the above description, but may be modified within the scope of the appended claims and their equivalents.

10: cloth (base paper) 20: fabric epidermis
30: adhesive 40: surface coating film

Claims (10)

As a synthetic leather skin composition for forming a skin layer of synthetic leather fabric:
Polyurethane Dispersion (PUD);
Wood powder mixed with the water-dispersed polyurethane; And
In order to realize the color of the synthetic leather fabric, a synthetic leather skin composition comprising a pigment mixed with the water-dispersed polyurethane together with the wood powder. According to claim 1,
The wood powder is a synthetic leather skin composition having a particle size of 1㎛ to 200㎛. According to claim 2,
The particle size of the wood powder is less than 150㎛ synthetic leather skin composition. According to claim 1,
A synthetic leather skin composition comprising 20 to 98.9% by weight of the water-dispersed polyurethane, 1 to 30% by weight of the wood powder, and 0.1 to 50% by weight of the pigment. According to claim 4,
The wood powder is a synthetic leather skin composition containing 5 to 20% by weight. Fabric forming the base of synthetic leather fabric; And
A synthetic leather comprising a fabric skin formed on one side of the fabric by the synthetic leather skin composition according to any one of claims 1 to 5. According to claim 6,
Synthetic leather further comprising a leather texture surface coating film formed by a surface coating agent in which polyurethane beads and a water-dispersed polyurethane having a particle size of 100 nm to 1500 nm are mixed. (a) forming a fabric skin by coating one side of a release paper with the synthetic leather skin composition according to any one of claims 1 to 5; and
Synthetic leather manufacturing method comprising the step (b) of applying an adhesive to the surface of the fabric skin and laminating a fabric forming the base of the synthetic leather fabric with the fabric skin. According to claim 8,
Before step (a),
In order to form a leather texture coating film between the release paper and the outer skin of the fabric, a step (c) of coating a leather texture composition containing water-dispersed polyurethane having a particle size of 100 nm to 1500 nm on one side of the release paper is further included. Synthetic leather manufacturing method. According to claim 8,
A synthetic leather manufacturing method in which the step of separating the release paper from the synthetic leather fabric having the fabric skin is performed after laminating the fabric and the skin of the fabric.

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