KR20250020117A - Manufacturing method of vegetable leather fabric and vegetable leather fabric - Google Patents

Abstract

The present invention relates to a method for manufacturing a vegetable leather fabric and a vegetable leather fabric. More specifically, the present invention relates to a method for manufacturing a vegetable leather fabric and a vegetable leather fabric manufactured by the method, wherein the method comprises the steps of: collecting plant-derived materials; selecting the collected plant-derived materials; drying the selected plant-derived materials; attaching the dried plant-derived materials on a base substrate; and forming a protective layer on the attached plant-derived materials.

Description

MANUFACTURING METHOD OF VEGETABLE LEATHER FABRIC AND VEGETABLE LEATHER FABRIC

The present invention relates to a method for manufacturing vegetable leather fabric and vegetable leather fabric.

Artificial leather (synthetic leather) is used as a substitute for natural leather in various fields such as shoes, clothing, gloves, miscellaneous goods, furniture, interior decoration materials, and automobile interior materials because it can provide a soft texture and unique appearance similar to natural leather, as well as flexibility and elasticity that cannot be expected from natural leather.

However, since the texture of artificial leather is very different from that of natural leather, the molding process to meet the eye level of consumers is becoming more complicated, and the processing molding process through dyeing and bonding is increasing, and as a result, the manufacturing process cost is rapidly increasing. In addition, since hazardous substances including hexavalent chromium (e.g., arylamine, formaldehyde, chlorinated phenols, DMF, etc.) are mainly used in the manufacturing process of artificial leather, they are harmful to the human body and cause environmental pollution when disposed of. In particular, water pollution by wastewater due to the use of a large amount of water in the dyeing process is a serious problem. Therefore, there is an urgent need to develop a manufacturing method for environmentally friendly and ethical leather manufacturing using new materials that can replace natural leather and existing artificial leather.

Onions are a plant belonging to the Allium genus of the Amaryllidaceae family, with 54 million tons of onions produced annually across 3 million hectares worldwide, and production has more than doubled over the past 10 years. In particular, Korea has an average yield of 40 to 60 t/ha, which is considered a high yield along with Japan, Europe, and the United States. However, onion skins have little utility other than as compost, and there is a lack of technology to recycle them into commercial products. Therefore, they are either dumped as vegetable waste or prevented from being used as they are, which causes environmental pollution due to bad odors and rotten water (leachate). Therefore, it is necessary to develop technologies for recycling onion skins.

Embodiments of the present invention provide a method for manufacturing a plant-based leather fabric based on natural materials by utilizing plant-derived materials (e.g., onion skins) in order to solve the above-mentioned problems.

Embodiments of the present invention provide a vegetable leather fabric manufactured by the method for manufacturing a vegetable leather fabric of the present invention, and having a unique pattern and texture of a vegetable-derived material (e.g., onion skin).

Embodiments of the present invention provide a product comprising the vegetable leather fabric of the present invention.

However, the problems to be solved by the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

According to an embodiment of the present invention, a method for manufacturing a vegetable leather fabric may include a step of collecting plant-derived materials; a step of selecting the collected plant-derived materials; a step of drying the selected plant-derived materials; a step of attaching the dried plant-derived materials onto a base substrate; and a step of forming a protective layer on the attached plant-derived materials.

In one embodiment, the plant-derived material is onion skin, and the onion can include at least one or more of a yellow onion, a white onion, a purple onion, a red onion, a pink onion, a cherry onion, a red long onion, a brown onion, an oval red onion, a round Breton onion, a shallot onion, a pecoros onion, or a stem onion, or a combination thereof.

According to one embodiment, the step of drying the selected plant-derived material may be drying the plant-derived material at a temperature of room temperature to 90° C. and for 1 hour to 100 hours without washing.

According to one embodiment, the base substrate may include a first layer, which is a fabric including at least one or more of woven fabrics, knitted fabrics, nonwoven fabrics, felts, meshes, nets, paper and pulp, or a combination thereof; and a second layer including an adhesive on the first layer.

According to one embodiment, the thickness of the base substrate is 500 ㎛ (micrometers) to 5,000 ㎛ (micrometers), the first layer may be a single layer or multiple layers, and the first layer and the second layer may be repeatedly laminated once or twice or more.

According to one embodiment, the second layer may be coated on the first layer with a film; or a dot, a straight line, an oblique line, a circular line, or a mesh pattern, and the second layer has a thickness of 10 ㎛ (micrometers) to 1,000 ㎛ (micrometers), and the second layer may include a hot melt adhesive including at least one or more of a polyester hot melt, a polyamide hot melt, an EVA hot melt, a polyolefin hot melt, a polyurethane hot melt, or a polyethylene hot melt, or a combination thereof.

According to one embodiment, the second layer may further include an additive including alginic acid, glue, hydrogel and casein.

According to one embodiment, the step of attaching the dried plant-derived material onto the base substrate may include arranging the dried plant-derived material on the base substrate and pressing it at a temperature of 50° C. to 90° C.

In one embodiment, the step of attaching the dried plant-derived material onto the base substrate may include attaching the plant-derived material in a single layer or multiple layers, and the plant-derived materials may be arranged in an overlapping joint manner to have an overlapping area of 0.5 mm (millimeters) to 10 mm (millimeters) wide or arranged at a spacing of 0 mm (millimeters) to 5 mm (millimeters).

According to one embodiment, the step of attaching the dried plant-derived material onto the base substrate includes: a first pressing step of arranging the dried plant-derived material on the base substrate and pressing it at a temperature of 50° C. to 90° C.; a step of applying a hot melt adhesive on the plant-derived material after the first pressing step; and a second pressing step of arranging the dried plant-derived material on the hot melt adhesive and pressing it at a temperature of 50° C. to 90° C.; and the applying step and the second pressing step may be repeated once or twice or more.

According to one embodiment, the step of forming a protective layer on the attached plant-derived material may include the step of applying a gel resin composition having a viscosity of 500 to 20,000 (cps/25°C) on the attached plant-derived material; and the step of drying at a temperature of room temperature to 100°C after the applying.

According to one embodiment, the gel resin may include 0.1 wt % to 3 wt % of 2-amino-2-methyl-1-propanol; 0.1 wt % to 3 wt % of octylphenoxypoly(ethoxyethanol); 1 wt % to 10 wt % of 2,2,4-trimethyl-1,3-pentadiol isobutyric acid; 0.05 wt % to 1 wt % of polyethylene glycol; 10 wt % to 60 wt % of acrylic acid polymer; and a balance of solvent.

According to one embodiment, in the step of applying the gel resin composition, a water-repellent composition may be further applied after applying the gel resin composition.

According to an embodiment of the present invention, a vegetable leather fabric may include: a base substrate layer; a plant-derived material layer attached singly or in multiple layers on the base substrate layer; and a protective layer on the plant-derived material layer.

According to one embodiment, the vegetable leather fabric may be manufactured by a method for manufacturing vegetable leather fabric according to embodiments of the present invention.

According to one embodiment, the vegetable leather fabric may be applied to interior products, accessory products, wallpaper, furniture, home appliances, clothing, shoes, hats or bags.

According to one embodiment, the present invention can provide a method for manufacturing a plant-derived leather fabric by recycling plant-derived materials (e.g., onion skins) that are discarded or disposed of as plant-derived waste, and implementing unique characteristics (e.g., texture or pattern) of the plant-derived materials.

According to one embodiment, the present invention can provide a vegetable leather fabric and a product including the same that can implement a unique pattern or texture of a plant-derived material (e.g., onion skin) while having strength, durability, workability, water repellency, and contamination resistance that can be utilized as a fashion material, an interior material, and a building material (e.g., materials for clothing, accessories, furniture, kitchenware, bags, shoes, wallpaper, etc.).

Figure 1 is an exemplary flow chart of a method for manufacturing a vegetable leather fabric of the present invention according to one embodiment of the present invention.
FIG. 2 is an exemplary image showing a vegetable leather fabric (e.g., onion skin-based leather fabric) of the present invention and a product manufactured therefrom according to one embodiment of the present invention.
FIGS. 3A to 3D illustrate a process of a method for manufacturing a plant-derived leather fabric according to an embodiment of the present invention, wherein FIG. 3A is an image of a dried plant-derived material (e.g., onion skin), FIG. 3B is an image of an attached plant-derived material (e.g., onion skin), FIG. 3C is an image of a plant-derived material (e.g., onion skin) to which a protective layer is applied, and FIG. 3D is an image of a dried plant-derived material (e.g., onion skin) after application of a protective layer.

Hereinafter, the method for manufacturing the vegetable leather fabric of the present invention, the vegetable leather fabric, and the product including the vegetable leather fabric will be specifically described with reference to examples and drawings. However, the present invention is not limited to these examples and drawings.

According to one embodiment, FIG. 1 is a process flow diagram of a method for manufacturing a vegetable leather fabric of the present invention, wherein the method for manufacturing a vegetable leather fabric in FIG. 1 may include a step of collecting plant-derived materials (100); a step of selecting the collected plant-derived materials (200); a step of drying the selected plant-derived materials (300); a step of attaching the dried plant-derived materials onto a base substrate (400); and a step of forming a protective layer on the attached plant-derived materials (500).

According to one embodiment, the step (100) of collecting plant-derived materials may be a step of collecting plant-derived materials generated during the harvesting, packaging, and transporting or cooking of the plant-derived materials. According to one embodiment, the plant-derived materials may be plant-derived materials of all varieties that can be cultivated or imported domestically (e.g., onions) or may be appropriately selected according to the harvesting season. For example, the plant-derived material is onion skin, and the onions in the onion skin may include at least one or more of yellow onions, white onions, purple onions, red onions, pink onions, cherry onions, red long onions, brown onions, oval red onions, round Breton onions, shallot onions, pecorose onions, or stem onions, or a combination thereof, but are not limited thereto. Preferably, it may be yellow onions that are highly produced and consumed domestically.

According to one embodiment, the step (200) of selecting the collected plant-derived materials may select plant-derived materials suitable for fabric (e.g., onion skins) from the collected plant-derived materials of step (100) and separate (i.e., cut) and trim the parts that are not suitable for fabric (e.g., parts other than the skins, i.e., roots, leaves, onion pith, etc.).

According to one embodiment, the step (300) of drying the selected plant-derived material may include freeze-drying, room temperature drying, or high-temperature drying of the selected and trimmed plant-derived material (e.g., onion skin). According to one embodiment, the drying may be performed at room temperature (rt) to 90° C.; room temperature (rt) to 80° C.; room temperature (rt) to 60° C.; room temperature (rt) to 50° C.; room temperature (rt) to 30° C.; or at room temperature or high temperature drying. Preferably, the drying may be performed at a temperature of room temperature to 30° C. At the above-mentioned temperature, for 1 hour or more; 10 hours or more; 24 hours or more; 48 hours or more; 60 hours or more; 1 to 100 hours; 1 to 100 hours; 24 to 100 hours; The drying can be performed for 36 hours to 100 hours or 48 hours to 100 hours to remove moisture. In one embodiment, the freeze-drying can be performed at a temperature of -30° C. (sub-zero) to -50° C. (sub-zero) for 1 hour to 10 hours; or 4 hours to 8 hours. Through this drying process, moisture is removed to improve adhesion and durability with the base substrate, prevent mold, bacterial growth, etc. due to residual moisture, and prevent breakage due to excessive drying. Drying of such plant-derived materials (e.g., onion skins) can be performed without washing the onion skins, and can be performed in a dryer, a vacuum dryer, or a freeze-dryer.

According to one embodiment, the step (400) of attaching the dried plant-derived material onto the base substrate may be performed by spreading and arranging a single or a plurality of dried plant-derived materials (e.g., onion peels) on the base substrate (e.g., the second layer) and then applying pressure to attach the dried plant-derived material onto the base substrate. According to one embodiment, the attaching step (400) may be performed by applying a constant pressure and compressing at a temperature of 50° C. to 90° C. Preferably, the temperature is 70° C. to 75° C., and this is to prevent damage to the material due to high temperatures (e.g., 100° C. or higher). For example, the thermal compression may be performed at a pressure of 20 N/mm to 150 N/mm. For example, the compression may be performed using a press machine (e.g., a flat plate heat press machine or an iron), a thermal compression bonding equipment, or a roll-to-roll equipment.

In one embodiment, the base substrate has the function of an adhesive wick and may include a first layer comprising a fabric and a second layer comprising an adhesive on the first layer. In one embodiment, the thickness of the base substrate may be from 500 μm (micrometers) to 5,000 μm (micrometers).

In one embodiment, the first layer can include a fabric comprising at least one or more of a woven fabric, a knitted fabric, a nonwoven fabric, a felt, a mesh, a net, paper, paperboard, or pulp, or a combination thereof. In one embodiment, the woven fabric, the knitted fabric, the nonwoven fabric, the felt, the mesh, the net, paper, paperboard, and the pulp can each include natural fibers, synthetic fibers, or both. The natural fibers can include, but are not limited to, at least one or more of cotton, bamboo, flax, abaca, coir, flax, hemp, jute, ramie, sisal, alpaca wool, angora wool, camel hair, cashmere, mohair, silk, wool, hardwood, softwood, or elephant grass fibers, or a combination thereof.

In one embodiment, the synthetic fiber may include, but is not limited to, at least one or more of polyester, polypropylene (PP), polyethylene (PE), acrylic butadiene styrene (ABS), polycarbonate (PC), nylon, polyvinyl chloride (PVC), polystyrene (PS), polyurethane (PU), polymethyl methacrylate (PMMA), polylactic acid (PLA), polyaramid, polytetrafluoroethylene, rayon, metal (e.g., copper, silver, etc.), glass fiber, metal fiber, graphite fiber, or carbon fiber, or a combination thereof.

In one embodiment, the paper or the pulp may comprise wood pulp (e.g., cellulose or lignin) or a mixture of natural fibers and wood pulp. In another embodiment, the nonwoven fabric may comprise the aforementioned natural fibers, synthetic fibers or both.

According to one embodiment, the knitted fabric may be a warp knit, a circular knit, or the like, but is not limited thereto.

According to one embodiment, the net and mesh may each include the above-mentioned natural fibers, synthetic fibers or both, and the net and mesh may have pore shapes of circles, ellipses or polygons or a combination thereof, and the net may be woven in a mesh shape.

In one embodiment, the first layer includes a single or multiple layers, and in one embodiment, the thickness of the first layer may be from 450 μm (micrometers) to 4,000 μm (micrometers). The first layer may be composed of a plurality of layers of the same or different components. In one embodiment, the first layer and the second layer may be multilayers that are repeatedly laminated once or twice or more. For example, the configuration of the first layer/second layer may be composed by repeating twice or more. For example, in the configuration of the first layer/second layer/the first'layer/the second'layer, the first layer and the first'layer may have different components or thicknesses. Alternatively, the second layer and the second'layer may have different components or thicknesses.

According to one embodiment, the second layer can be applied by impregnating, coating or laminating the first layer onto the first layer. The coating can form a coating film or a specific shape of a pattern (or a pattern film) along the surface of the first layer. For example, the second layer can be coated to form a film (e.g., a film) or a dot, a straight line, a diagonal line, a curved line (e.g., an S or Z shape, a semicircle, etc.), a comb-shaped line, a circular line, or a mesh pattern on the first layer. According to one embodiment, the second layer can be impregnated by penetrating the surface of the first layer by more than 0% to 50%; 5% to 50%; or more than 10% to 50% in the depth direction. According to one embodiment, the thickness of the second layer can be 10 μm (micrometer) to 1,000 μm (micrometer).

According to one embodiment, the second layer includes a hot melt adhesive, which is for bonding to the plant-derived material (e.g., onion skin) through heat compression. Examples of the hot melt adhesive may include a hot melt adhesive including at least one or more of a polyester hot melt, a polyamide hot melt, an EVA (ethylene vinyl acetate (EVA) hot melt, a polyolefin hot melt, a polyurethane hot melt, or a polyethylene hot melt, or a combination thereof. The hot melt adhesive may mean an adhesive that is liquefied at a high temperature using a thermoplastic resin, solidifies after compression, and exhibits adhesive strength. The hot melt adhesive may be made without water or a solvent, or a solvent may be added if necessary. The hot melt adhesive may be a hot melt adhesive that is manufactured by a method known in the art or that can be purchased as a product, and is not specifically mentioned herein.

According to one embodiment, the hot melt adhesive may be a mixture of two or more kinds or three or more kinds, for example, 15 to 85 wt% of a polyester-based hot melt adhesive (e.g., Sika SikaMelt, 9120) and 15 to 85 wt% of a hot melt adhesive other than the polyester-based hot melt adhesive (e.g., a polyamide hot melt adhesive (e.g., Henkel Macromelt, 6208), a polyethylene hot melt (e.g., Haojing, HJ-225EA) and/or an EVA hot melt (GOOD ADHESIVE, YD-6AB) or all of these, wherein the mixing ratio (w/w) is 1: 1: 1). By applying these two or more kinds of hot melt adhesives, it is possible to provide a vegetable leather fabric having excellent durability, strength, etc.

According to one embodiment, the second layer further includes additives including alginic acid, glue, hydrogel, and casein, and includes 1 part by weight to 20 parts by weight based on 100 parts by weight of the hot melt adhesive, and the mixing ratio thereof may be 1:1 to 2:1 to 2:1 to 2 (w/w). The addition of such additives can improve adhesion and durability with plant-derived materials (e.g., onion skins).

According to one embodiment, the second layer may further include natural fibers having an average length of 0.1 mm (millimeters) to 10 mm (millimeters) and thermoplastic resin powder. The thermoplastic resin powder may be included in an amount of 1 part by weight to 20 parts by weight relative to 100 parts by weight of the hot melt adhesive. The natural fibers are included in an amount of 1 part by weight to 20 parts by weight relative to 100 parts by weight of the hot melt adhesive, and the natural fibers are selected from the natural fibers mentioned in the first layer, and a mixing ratio (w/w) of the natural fibers to the thermoplastic resin powder may be 2:1 to 10:1. This can stably maintain the second layer in a thermocompression process and improve adhesion with plant-derived materials (e.g., onion skins). The above thermoplastic resin powder may include at least one or more of polypropylene ether phthalate, polyethylene ether phthalate, polyvinyl chloride, polyurethane-based elastomer, polyester-based elastomer, polyamide-based elastomer, polybutadiene-based elastomer, polyisoprene-based elastomer, or acrylonitrile-based elastomer, or a combination thereof.

According to one embodiment, the additive and the natural fiber and thermoplastic resin powder particles can be mixed with the hot melt adhesive or coated on the second layer.

According to one embodiment, the step (400) of attaching a dried plant-derived material onto a base substrate attaches the plant-derived material (e.g., onion skins) in a single layer or multiple layers, and the plant-derived material (e.g., onion skins) may be arranged continuously on the base substrate, arranged with a spaced gap, or arranged in an overlapping joint manner.

In one embodiment, the plant-derived materials (e.g., onion skins) can be arranged continuously without a gap between them and in contact with each other. For example, the plant-derived materials (e.g., onion skins) can be arranged at a gap of 0 mm (or more than 0 mm) to 5 mm. In one embodiment, the plant-derived materials (e.g., onion skins) can be arranged in an overlapping manner to have an overlapping area of a size (e.g., width) of 0.5 mm (millimeters) to 10 mm (millimeters). In one embodiment, when the plant-derived materials (e.g., onion skins) are configured in multiple layers, the arrangement of the plant-derived materials (e.g., onion skins) in each layer can be selected from the continuous arrangement, the overlapping manner, and the arrangement manner with a gap, respectively, mentioned above. For example, the overlapping manner can be used for lamination using not only the same plane but also the overlapping control of the lower layer and the upper layer. For example, in the case of the above multi-layer, the plant-derived material (e.g., onion skin) of the lower layer can be laminated in an overlapping joint manner to have an overlapping area of 0.5 mm (millimeter) to 10 mm (millimeter) in size (e.g., width).

According to one embodiment, the step (400) of attaching a dried plant-derived material onto a base substrate includes, when laminating multiple layers of plant-derived materials (e.g., onion skins), a first pressing step of spreading and arranging the dried plant-derived material (e.g., onion skins) on the base substrate (e.g., the second layer) and then pressing at a temperature of 50° C. to 90° C.; a step of applying a hot melt adhesive after the first pressing step; and a second pressing step of spreading and arranging the dried plant-derived material (e.g., onion skins) on the hot melt adhesive and then pressing; and the applying step and the second pressing step may be repeated once or twice or more. The hot melt adhesive is selected from the components mentioned in the second layer, and may further include additives, fibers, thermoplastic resins, etc. mentioned in the second layer.

The above first pressing step and the above first pressing step can utilize the pressing conditions mentioned in step (300).

According to one embodiment, the step (400) of attaching a dried plant-derived material to a base substrate may be performed by, when laminating multiple layers of the plant-derived material (e.g., onion skins), spreading and arranging the dried plant-derived material (e.g., onion skins) on the base substrate, laminating multiple layers without applying an additional adhesive, and then pressing. The pressing may utilize the thermocompression process mentioned above.

According to one embodiment, the step (500) of forming a protective layer on the attached plant-derived material may include, after step (400), applying a gel resin composition on the attached plant-derived material (e.g., onion skin) to coat a protective layer (e.g., a transparent gel resin layer). According to one embodiment, the step may include: applying a gel resin composition on the attached plant-derived material (e.g., onion skin); and drying at a temperature of room temperature to 90° C. after the application.

According to one embodiment, the gel resin can be a viscous transparent gel resin (e.g., Gel Medium). For example, the viscosity of the gel resin can be 500 to 20,000; 1000 to 20,000; or 5,000 to 20,000 (cps/25° C.) (average value). The gel resin is elastic, prevents cracking after drying, and can improve the durability of vegetable leather fabric. In addition, it can impart a luster, etc. to the vegetable leather fabric. The viscosity can be obtained by a standard method for measuring the viscosity of a resin composition known in the art. For example, the gel resin comprises 0.1 to 3 wt % of 2-amino-2-methyl-1-propanol; 0.1 to 3 wt % of octylphenoxypoly(ethoxyethanol); The gel resin may include 1 to 10 wt% of 2,2,4-trimethyl-1,3-pentadiol isobutyric acid; 0.05 to 1 wt% of polyethylene glycol; 10 to 60 wt% of acrylic acid polymer; and the remainder of a solvent. In the gel resin, the acrylic acid polymer may be PAA (poly(acrylic acid), formula 1 below) or poly(methyl methacrylate) (PMMA) (formula 2 below). The acrylic acid polymer may have a molecular weight of 10,000 to 500,000 g/mol (or, Mn or Mw).

[Chemical Formula 1]

[Chemical formula 2]

According to one embodiment, the solvent may be water, alcohol, glycol, or the like, and the solvent may be the remainder or 20 wt % to 90 wt % of the gel resin.

According to one embodiment, the gel resin can be applied onto a plant-derived material (e.g., onion skin) and then cured and dried at a temperature of room temperature to 90° C. for 1 hour to 50 hours to form a film (e.g., a transparent gel resin layer).

According to one embodiment, the step (400) of forming a protective layer on the attached plant-derived material may form a transparent gel resin layer and a water-repellent and stain-proof layer on the attached plant-derived material (e.g., onion skin) after the step (300). That is, in the step of applying the gel resin composition, a water-repellent composition may be further applied after applying the gel resin composition.

According to one embodiment, the water-repellent, dirt-repellent and/or waterproofing layer may use a water-repellent composition comprising 50 to 80 wt% of a fluorinated water-repellent agent and an additive (1 to 10 wt%) selected from organic polysilazane, silicone resin, silicone oil and silicone oligomer; and optionally a cross-linking agent or a residual solvent (dimethylacetamide, acetone, methanol or ethanol, water). The silicone oil and silicone oligomer may be applied without limitation as long as they provide a water-repellent, dirt-repellent and/or waterproofing function.

According to one embodiment, the fluorine-based water repellent may include at least one or more of polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer (EPE), tetrafluoroethylene-ethylene copolymer (ETFE), polychlorotrifluoroethylene (PCTFE), chlorotrifluoroethylene-ethylene copolymer (ECTFE), or polyvinylidene fluoride (PVDF), or a combination thereof.

According to one embodiment, the organopolysilazane refers to a compound having a repeating unit composed of Si-N and having a hydrogen atom, an alkyl (e.g., having 1 to 12 carbon atoms), an alkoxy, an aryl functional group (e.g., having 6 to 10 carbon atoms) in a side chain, and a polysilazane having a Si/N ratio of 1.4 or more can be used. Optionally, it can be applied as a solution composed of 5% organopolysilazane and 95% solvent. For example, the organopolysilazane can be products such as KDT Ceraset Polysilazane 20, KDT Ceraset Polyureasilazane, KDT Ceraset DI-200 from KDT (KiON Defense Technologies); DURAZANE 1500 RC, DURAZANE 1500 SC, DURAZANE 1800 from DURAZANE;

According to one embodiment, the silicone resin may include at least one of trimethylsiloxysilicate/cyclotetrasiloxane, trimethylsiloxysilicate/cyclopentasiloxane, trimethylsiloxysilicate/isododecane, and trimethylsiloxysilicate/dimethicone.

According to one embodiment, the thickness of the protective layer is 0.01 mm (millimeters) to 5 mm (millimeters), and the gel resin layer and the water-repellent and dirt-proof layer can each be formed to a thickness of 0.01 mm (millimeters) to 5 mm (millimeters).

According to one embodiment, the “coating” in the present invention may utilize knife coating, spin coating, bar coating, spray coating, etc.

According to one embodiment, “drying” in the present invention may be performed in a dry state (e.g., relative humidity of 30% or less) under indoor exposure, vacuum, atmospheric pressure, in an inert gas atmosphere, or using a dehumidifier.

According to one embodiment, the vegetable leather fabric of the present invention may include a base substrate layer; a plant-derived material (e.g., onion skin) layer attached singly or in multiple layers on the base substrate layer; and a protective layer on the plant-derived material (e.g., onion skin) layer. The composition of each layer is as mentioned in the manufacturing method.

According to one embodiment, the plant-derived material (e.g., onion skin) layer may be single or multiple layers, and each of the plant-derived materials (e.g., onion skin) may have a width of 1 mm (millimeter) to 100 mm (millimeter). That is, the plant-derived material (e.g., onion skin) layer may include two or more kinds of plant-derived materials (e.g., onion skin) having different width sizes.

According to one embodiment, a product comprising the vegetable leather fabric of the present invention may be a building material (e.g., an interior material, an exterior material, a flooring material, or a surface material), an interior product (e.g., a wallpaper), an accessory product, furniture, home appliances, clothing, shoes, a hat, or a bag. For example, as shown in FIG. 2, a bag (pouch) having a unique pattern of a plant-derived material (e.g., onion skin) can be provided using the vegetable leather fabric.

Example 1

The collected plant-derived materials, i.e., onion skins, were selected as clean and suitable for fabric manufacturing, and the onion pith, roots, etc. were removed. Next, they were dried at room temperature (20 ± 5 ℃) for 3 to 4 days. Although it is not necessary to use wind during drying, a dehumidifying function can be used to dry more quickly if rapid drying is required. The dried onion is shown in Fig. 3a. The dried onion skins were attached on the layer to which the adhesive was applied on an adhesive interlining (nonwoven fabric (2 mm)/adhesive layer (1 mm) (composition: Sika SikaMelt, 9120, 60 wt%; and Haojing, HJ-225EA + GOOD ADHESIVE, YD-6AB (1: 1 mass ratio), 40 wt%)) and heat-pressed with an iron heated to a temperature of about 70 ℃ (Fig. 3b). Next, a transparent gel resin (gel medium; Alpha Acrylic Auxiliary Gel Medium - 37926) was sprayed once and dried at room temperature (20 ± 5℃) to 30℃ for 48 hours to form a 0.1 mm thick protective film. The completed vegetable leather fabric can be confirmed in Fig. 3d.

Example 2

The process for applying the transparent gel resin was the same as in Example 1, and a water-repellent composition (40 wt% polytetrafluoroethylene (PTFE), 10 wt% trimethylsiloxysilicate/cyclotetrasiloxane, silicone oil (KF96-1000CS), 10 wt% polysilazane (KDT Ceraset Polysilazane 20) (mass ratio of 1: 1: 2), and the remainder hexane) was sprayed and dried after the transparent gel resin was sprayed and dried (film with a thickness of 0.5 mm) to form a water-repellent, dirt-proof film (thickness of 0.1 mm).

Property Evaluation

1) Tensile strength was measured using the KSK 0520 measurement method.

Example 1 was measured to have a tensile strength of 70 (kgf)) and Example 2 was measured to have a tensile strength of 72 (kgf), and it can be confirmed that both have excellent tensile strength.

2) My contamination assessment

The contamination evaluation is performed by visually checking the degree of each contamination about 50 times using the same contamination source. The contamination sources used were an oil-based ballpoint pen and mustard, which are generally the most difficult to remove (contaminate). The oil-based pen on the upper part of the fabrics of Examples 1 and 2 to which the onion skins were adhered was easily erased with an eraser and fabric/paper towel without using a special cleaner, and in the case of the mustard, it was also cleanly erased without leaving any contamination using the fabric or paper towel without using a special cleaner.

3) Water repellency evaluation

The water repellency evaluation method was to drip water onto the top of the fabric where the onion skin was adhered, and then visually check the shape of the dripped water or the degree of water absorption to evaluate the water repellency. In the fabric of Example 2, the water droplets maintained their original shape even after time passed and were not absorbed into the fabric.

4) Wear resistance evaluation (friction fastness)

Abrasion resistance was evaluated by evaluating dry friction fastness. Two test pieces measuring 25 mm in width and 220 mm in length were taken parallel to the longitudinal direction and fixed to the test stand of the friction tester using the test equipment specified in ISO 105, and the friction bar of the friction tester was covered and fixed with a cotton cloth, each of which was 50 mm in length and width, to conduct the evaluation. After applying a load of 4.9 N (500 gf) to the friction bar, the surface of the test piece was moved back and forth 100 times at a reciprocating speed of 30 times/min and a moving distance of 100 mm, and then the cotton cloth was peeled off to determine the degree of contamination of the cotton cloth using a gray scale for contamination to obtain a grade.

As a result of the experiment, Examples 1 and 2 of the present invention obtained a fastness grade (4 to 5) suitable for fabric.

The present invention can provide a plant-derived material having wear resistance, strength, durability, and also having contamination resistance and water-repellent properties, i.e., a vegetable leather fabric utilizing onion skin.

As such, the present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, such modified or modified examples should fall within the scope of the claims of the present invention.

Claims (14)

A step of collecting plant-derived materials;
A step of selecting from collected plant-derived materials;
A step of drying selected plant-derived materials;
A step of attaching dried plant-derived material onto a base substrate; and
A step of forming a protective layer on the attached plant-derived material;
A method for manufacturing vegetable leather fabric, comprising:
In the first paragraph,
The above plant-derived material is onion skin.
The above onions,
A method for manufacturing a vegetable leather fabric, comprising at least one or more of yellow onions, white onions, purple onions, red onions, pink onions, cherry onions, red long onions, brown onions, oval red onions, round Breton onions, shallot onions, pecorino onions or stem onions, or a combination thereof.
In the first paragraph,
The step of drying the selected plant-derived materials is as follows:
A method for manufacturing vegetable leather fabric, comprising drying plant-derived materials at a temperature of room temperature to 90° C. for 1 to 100 hours without washing.
In the first paragraph,
The above base material is
A first layer comprising a fabric comprising at least one or more of woven fabrics, knitted fabrics, nonwoven fabrics, felt, mesh, netting, paper and pulp, or a combination thereof; and a second layer comprising an adhesive on the first layer.
A method for manufacturing vegetable leather fabric, comprising:
In paragraph 4,
The second layer is coated on the first layer with a film; or a dot, straight line, diagonal line, circular line or mesh pattern;
The thickness of the second layer is 10 ㎛ (micrometer) to 1,000 ㎛ (micrometer),
The above second floor is,
A method for manufacturing vegetable leather fabric, comprising a hot melt adhesive comprising at least one or a combination of a polyester hot melt, a polyamide hot melt, an EVA hot melt, a polyolefin hot melt, a polyurethane hot melt, or a polyethylene hot melt;
In the first paragraph,
The step of attaching the above dried plant-derived material to the base substrate is:
A method for manufacturing vegetable leather fabric, comprising arranging the dried plant-derived material on the base material and pressing it at a temperature of 50°C to 90°C.
In the first paragraph,
The step of attaching the above dried plant-derived material to the base substrate is:
Attaching plant-derived materials in a single layer or multiple layers,
A method for manufacturing a vegetable leather fabric, wherein the plant-derived materials are arranged in an overlapping manner to have an overlapping area of 0.5 mm (millimeters) to 10 mm (millimeters) wide or arranged at a spacing of 0 mm (millimeters) to 5 mm (millimeters).
In the first paragraph,
The step of attaching the above dried plant-derived material to the base substrate is:
A first pressing step of arranging the dried plant-derived material on the base substrate and pressing it at a temperature of 50°C to 90°C;
A step of applying a hot melt adhesive on the plant-derived material after the first pressing step; and
A second pressing step of arranging the dried plant-derived material on the hot melt adhesive and pressing it at a temperature of 50° C. to 90° C.;
Including,
A method for manufacturing vegetable leather fabric, wherein the above-mentioned applying step and the above-mentioned second pressing step are repeated once or twice or more.
In the first paragraph,
The step of forming a protective layer on the above attached plant-derived material is:
A step of applying a gel resin composition having a viscosity of 500 to 20,000 (cps/25°C) on the attached plant-derived material; and
A step of drying at a temperature of room temperature to 100 ℃ after the above application;
which includes,
Method for manufacturing vegetable leather fabric.
In Article 9,
The above gel resin
0.1 to 3 wt% of 2-amino-2-methyl-1-propanol;
0.1 to 3 wt% of octylphenoxypoly(ethoxyethanol);
1 to 10 wt% of 2,2,4-trimethyl-1,3-pentadiol isobutyric acid;
0.05 wt% to 1 wt% of polyethylene glycol;
10 to 60 wt% of acrylic acid polymer; and
residual solvent;
A method for manufacturing vegetable leather fabric, comprising:
In Article 9,
A method for manufacturing vegetable leather fabric, wherein, in the step of applying the gel resin composition, a water-repellent composition is further applied after applying the gel resin composition.
Base substrate layer;
A plant-derived material layer attached singly or in multiple layers on the base substrate layer; and
A protective layer on the above plant-derived material layer;
Including,
Vegetable leather fabric.
In Article 12,
The above vegetable leather fabric is,
A vegetable leather fabric manufactured by the method of any one of claims 1 to 11.
In Article 12,
The above vegetable leather fabric is,
Vegetable leather fabric for use in accessory products, wallpaper, furniture, home appliances, clothing, shoes, hats or bags.