KR102824115B1 - Method for manufacturing 3-Layer structured vegetable-based eco-friendly leather - Google Patents

Abstract

The present invention relates to a method for manufacturing a three-layer structured plant-based eco-friendly leather, wherein the three-layer structured plant-based eco-friendly leather manufacturing method is structurally improved so that texture, elasticity, stretchability, and physical properties can be controlled according to the thickness of the coating of a dimensionally stable resin layer and an elastic resin layer, thereby providing plant-based leather of optimized quality for different applications including clothing, shoes, and bags while meeting the needs of various consumers, and in particular, the method mainly comprises a pretreatment step (S10), a dimensionally stable resin layer coating step (S20), an elastic resin layer coating step (S30), and a color resin layer coating step (S40) so as to enable the color of the plant-based leather to be expressed diversely and precisely using a color resin layer.

Description

{Method for manufacturing 3-Layer structured vegetable-based eco-friendly leather}

The present invention relates to a method for manufacturing a three-layered vegetable-based eco-friendly leather, and more specifically, to a method for manufacturing a three-layered vegetable-based eco-friendly leather, which is structurally improved so that texture, elasticity, stretchability, and physical properties can be adjusted according to the thickness of the coating of a dimensionally stable resin layer and an elastic resin layer, thereby meeting the needs of various users and providing vegetable-based leather of optimized quality for different fields of use, including clothing, shoes, and bags, and in particular, capable of expressing the colors of the vegetable-based leather in a variety of ways and with precision using a color resin layer.

In general, leather is largely divided into natural animal leather, which is recognized as a luxury product, and artificial leather, which is produced recently. Natural leather is preferred over artificial leather because it has a superior texture and is luxurious and durable. However, since the raw hide obtained by slaughtering animals is processed to produce various clothing, accessories, and daily necessities, it has the disadvantages of being expensive and limited in quantity.

In addition, 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 to protect animals spreads, there is a trend of boycotting due to the aversion to using natural leather.

Due to this, the demand for synthetic leather, which is artificially manufactured to replace natural leather, is increasing, and synthetic leather is used as a material in various fields such as living materials such as bags, fashion materials such as wallets and belts, furniture upholstery materials such as sofas, wall or floor materials, medical materials, or various interior materials such as automobile interior materials. However, due to the nature of the material, the problem of environmental pollution is being raised.

In this regard, in the previously disclosed patent publication No. 10-2021-0106643, a leather texture forming composition for vegetable leather, which forms the texture of natural leather on the surface of vegetable leather material, which is a substitute for natural leather, was first proposed: a leather texture forming composition for vegetable leather, which is applied to the surface of the vegetable leather and includes a water-dispersed polyurethane having a particle size of 100 nm to 1500 nm.

However, the above-mentioned prior art aims to provide vegetable leather to replace natural leather and artificial leather by using various plant materials, but since hazardous substances (arylamine, formaldehyde, chlorinated phenols, DMF, etc.) including hexavalent chromium are mainly used in the artificial leather manufacturing process, they are harmful to the human body and cause environmental pollution when disposed of, and in particular, there was a serious problem of water pollution by wastewater due to the use of a large amount of water in the dyeing process.

Accordingly, the present invention has been conceived to solve the above-mentioned problems, and the purpose of the present invention is to provide vegetable leather of optimized quality for different fields of use, including clothing, shoes, and bags, while satisfying the needs of various users by improving the structure so that the texture, elasticity, stretchability, and physical properties can be adjusted according to the thickness of the coating of the dimensionally stable resin layer and the elastic resin layer, and in particular, to provide a method for manufacturing vegetable eco-friendly leather with a three-layer structure that can express the colors of the vegetable leather in a variety of ways and precisely by using a color resin layer.

In order to achieve this purpose, the present invention is characterized by a pretreatment step (S10) of manufacturing a base fabric (10) by immersing a fabric in a natural dye containing a persimmon fermentation liquid, and then performing a dehydration and drying process; a dimensionally stable resin layer coating step (S20) of coating a dimensionally stable resin layer (20) with a thickness of 0.1 mm to 0.5 mm on the surface of the base fabric (10) that has undergone the pretreatment step (S10), and then drying it with hot air at 100°C to 160°C; an elastic resin layer coating step (S30) of coating an elastic resin layer (30) with a thickness of 0.1 mm to 0.5 mm on the dimensionally stable resin layer (20), and then drying it with hot air at 100°C to 160°C; And it is characterized by including a color resin layer coating step (S40) of coating a color resin layer (40) with a thickness of 0.1 mm to 0.5 mm on the elastic resin layer (30) and then drying it with hot air at 100°C to 160°C.

At this time, in the above pretreatment step (S10), the fermented liquid is characterized by an acidity of pH 3 to 3.5.

In addition, it is characterized in that the tannin contained in the fermented liquid in the above pretreatment step (S10) blocks pores in the fiber tissue of the base fabric (10) and binds the fiber tissue, thereby preventing the phenomenon of the dimension-stabilizing resin layer (20) penetrating to the back of the base fabric (10) in the dimension-stabilizing resin layer coating step (S20).

In addition, in the above pretreatment step (S10), the base fabric (10) is dried by hot air while passing through the first to fifth hot air drying chambers in stages at a speed of 3 to 5 M/m, and the first hot air drying chamber is set to 100 to 120°C, the second hot air drying chamber is set to 120 to 140°C, the third hot air drying chamber is set to 140 to 160°C, the fourth hot air drying chamber is set to 160 to 180°C, and the fifth hot air drying chamber is set to 180 to 200°C.

In addition, in the dimension-stabilizing resin layer coating step (S20), the elastic resin layer coating step (S30), and the color resin layer coating step (S40), the base fabric (10) is dried by hot air while passing through the first to fifth hot air drying chambers in stages at a speed of 2 to 3 M/m, and the first hot air drying chamber is set to 100 to 120°C, the second hot air drying chamber is set to 120 to 140°C, the third hot air drying chamber is set to 140 to 160°C, the fourth hot air drying chamber is set to 160 to 180°C, and the fifth hot air drying chamber is set to 140 to 160°C.

In addition, the dimensionally stable resin layer (20) is formed by mixing 28 to 32 parts by weight of at least one vegetable protein selected from gluten, isolated soy protein, hydrolyzed protein, and vegetable amino acids, 18 to 22 parts by weight of liquid natural rubber, 18 to 22 parts by weight of fermented persimmon, 18 to 22 parts by weight of pH 3 to 3.5, and then, based on 100 parts by weight of the liquid natural rubber, 18 to 22 parts by weight of at least one filler selected from powdered cellulose, CMC, high-cell, calcium carbonate, talc, and silicon dioxide, and 8 to 12 parts by weight of at least one drying oil selected from linseed oil, tung oil, poppy oil, safflower oil, soybean oil, hemp seed oil, and castor oil. After that, it is characterized in that it is prepared by mixing 8 to 12 weight parts of emulsifiers selected from soy lecithin, oleic acid, solvabilizer (TWEEN80), and apple surfactant based on 100 weight parts of the drying oil.

In addition, the elastic resin layer (30) is formed of at least one of sodium hydroxide, potassium hydroxide, and potassium carbonate, and is formed by mixing 13 to 17 parts by weight of at least one vegetable protein selected from gluten, isolated soy protein, hydrolyzed protein, and vegetable amino acids, 38 to 42 parts by weight of liquid natural rubber, and 38 to 42 parts by weight of fermented persimmon, with respect to 100 parts by weight of an alkaline aqueous solution having a pH of 10 to 15, and then mixing 8 to 12 parts by weight of at least one drying oil selected from linseed oil, tung oil, poppy oil, safflower oil, soybean oil, hemp seed oil, and castor oil, with respect to 100 parts by weight of the drying oil, and then mixing 8 to 12 parts by weight of at least one drying oil selected from linseed oil, tung oil, poppy oil, safflower oil, soybean oil, hemp seed oil, and castor oil, with respect to 100 parts by weight of the drying oil, soy lecithin, oleic acid, solvylanisers (TWEEN80), and apple surfactants. It is characterized by being provided so as to mix 8 to 12 parts by weight of one or more emulsifiers.

In addition, the color resin layer (40) is formed by at least one of sodium hydroxide, potassium hydroxide, and potassium carbonate, and 13 to 17 parts by weight of at least one vegetable protein selected from gluten, isolated soy protein, hydrolyzed protein, and vegetable amino acids, 28 to 32 parts by weight of liquid natural rubber, 28 to 32 parts by weight of fermented persimmon, 28 to 32 parts by weight of pH 3 to 3.5, based on 100 parts by weight of the liquid natural rubber, and then 8 to 12 parts by weight of at least one drying oil selected from linseed oil, tung oil, poppy oil, safflower oil, soybean oil, hemp seed oil, and castor oil, based on 100 parts by weight of the drying oil, and then 8 to 12 parts by weight of soy lecithin, oleic acid, solvylanisers (TWEEN80), and apple surfactants, based on 100 parts by weight of the drying oil, It is characterized in that it is provided so as to mix 8 to 12 parts by weight of one or more emulsifiers and 1 to 5 parts by weight of one or more coloring agents among natural dyes, organic pigments, and inorganic pigments based on 100 parts by weight of the entire mixture constituting the color resin layer (40).

In addition, based on 100 parts by weight of the entire mixture constituting the dimensionally stable resin layer (20) and the elastic resin layer (30), at least one colorant among natural dyes, organic pigments, and inorganic pigments is mixed in an amount of 0.1 to 0.3 parts by weight so as to form a base color expressed by the dimensionally stable resin layer (20) and the elastic resin layer (30), and after the elastic resin layer coating step (S30), the ratio of the colorant mixed in the color resin layer (40) is determined based on the base color of the base fabric (10) coated with the elastic resin layer (30) within a range of mixing 1 to 5 parts by weight of the colorant.

In addition, it is characterized in that the elastic resin layer (30) is formed thicker than the thickness of the dimensionally stable resin layer (20) coating to add elasticity and flexibility to the base fabric (10), or the dimensionally stable resin layer (20) is formed thicker than the thickness of the elastic resin layer (30) coating to add dimensional stability to the base fabric (10).

According to the above composition and function, the present invention is structurally improved so that the texture, elasticity, stretchability, and physical properties can be adjusted according to the thickness of the dimensionally stable resin layer and the elastic resin layer coating, thereby providing vegetable leather of optimized quality for different fields of use including clothing, shoes, and bags while satisfying the needs of various users, and in particular, there is an effect of being able to express the color of the vegetable leather in a variety of ways and precisely by using the color resin layer.

Figure 1 is a block diagram sequentially showing a method for manufacturing a three-layer structured plant-based eco-friendly leather according to one embodiment of the present invention.
Figure 2 is a schematic diagram sequentially showing a method for manufacturing a three-layer structured plant-based eco-friendly leather according to one embodiment of the present invention.
FIG. 3 is a diagram showing the configuration of a base fabric, a dimensionally stable resin layer, an elastic resin layer, and a color resin layer of a method for manufacturing a three-layer structured plant-based eco-friendly leather according to one embodiment of the present invention.
FIG. 4 is a product photograph showing various colored vegetable leathers manufactured using a method for manufacturing vegetable-based eco-friendly leather with a three-layer structure according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

FIG. 1 is a block diagram sequentially showing a method for manufacturing a three-layered vegetable-based eco-friendly leather according to an embodiment of the present invention, FIG. 2 is a configuration diagram sequentially showing a method for manufacturing a three-layered vegetable-based eco-friendly leather according to an embodiment of the present invention, FIG. 3 is a configuration diagram showing a base fabric, a dimensionally stable resin layer, an elastic resin layer, and a color resin layer of a method for manufacturing a three-layered vegetable-based eco-friendly leather according to an embodiment of the present invention, and FIG. 4 is a product photograph showing various colored vegetable-based leathers manufactured using a method for manufacturing a three-layered vegetable-based eco-friendly leather according to an embodiment of the present invention.

The present invention relates to a method for manufacturing a three-layer structured plant-based eco-friendly leather, wherein the three-layer structured plant-based eco-friendly leather manufacturing method is structurally improved so that texture, elasticity, stretchability, and physical properties can be controlled according to the thickness of the coating of a dimensionally stable resin layer and an elastic resin layer, thereby providing plant-based leather of optimized quality for different applications including clothing, shoes, and bags while meeting the needs of various consumers, and in particular, the method mainly comprises a pretreatment step (S10), a dimensionally stable resin layer coating step (S20), an elastic resin layer coating step (S30), and a color resin layer coating step (S40) so as to enable the color of the plant-based leather to be expressed diversely and precisely using a color resin layer.

1. Preprocessing step (S10)

The pretreatment step (S10) according to the present invention is a step of manufacturing a base fabric (10) by immersing the fabric in a natural dye containing a fermented solution of persimmon and then going through a dehydration and drying process.

The above base fabric (10) is formed of natural fibers including cotton fibers, and when immersed in natural dye, tannin contained in the persimmon fermentation liquid blocks the pores in the fiber tissue of the base fabric (10) and binds the fiber tissue.

Due to this, the phenomenon of the dimensionally stable resin layer (20) penetrating through the back surface of the base fabric (10) is prevented in the subsequent dimensionally stable resin layer coating step (S20), and further, the shrinkage rate of the base fabric (10) is prevented in the dimensionally stable resin layer coating step (S20), the elastic resin layer coating step (S30), and the color resin layer coating step (S40), thereby stabilizing the degree of curvature and preventing the peeling of the coating layer on the fabric, and furthermore, the fabric has antibacterial and deodorizing properties.

That is, the tannin contained in the above fermented persimmon liquid is condensed with a polyphenol component to have a strong binding force with large particle substances (resinous substances, proteins, metal salts), and in particular, the persimmon fermented liquid has starch fermented to make the particles smaller by sugar, so that the texture of the fabric becomes soft, the color development of the persimmon juice is excellent, and the pH is stabilized, so that a separate acidity control operation can be omitted.

At this time, in the above pretreatment step (S10), the acidity of the fermented liquid is pH 3 to 3.5.

The above fermented liquid has an acidity of pH 3 to 3.5, so it neutralizes with a slightly alkaline resin to form a safe pH (neutral), and has strong adhesiveness due to complete curing after coating. In other words, it has the effect of having strong adhesiveness with a slightly alkaline dimensional stability resin during coating.

In addition, if the acidity of the persimmon fermentation liquid is stabilized at pH 3 to 3.5, it is easy to neutralize and remove any alkaline components (sodium hydroxide (NaOH)) remaining in the fabric during refining and sizing, and the color is not cloudy when coloring after pretreatment and a clear color is obtained, and the color of the persimmon fermentation liquid remaining after pretreatment does not change much, so it is easy to reuse.

Meanwhile, if the pH of the persimmon fermentation solution is less than 3.0, the moment the persimmon fermentation solution pretreated fabric comes into contact with the slightly alkaline dimensional stabilizing resin, it reacts with the vegetable protein and liquid natural rubber, causing a coagulation phenomenon, which interferes with the coating process and becomes a factor in the occurrence of defects. In addition, if the pH of the persimmon fermentation solution exceeds 3.5, even if the coating process is performed with a slightly alkaline resin, the neutralization reaction does not occur and the stabilization is not achieved, and the alkalinity is maintained even after the coating process, slowing down the cross-linking of the vegetable protein and liquid natural rubber at the contact surface between the pretreated fabric and the dimensional stabilizing resin, preventing complete curing even after mechanical operation and causing the coating layer to peel off.

In addition, in the above pretreatment step (S10), the base fabric (10) is provided to be dried by hot air while passing through the first to fifth hot air drying chambers in stages at a speed of 3 to 5 M/m.

At this time, the first hot air drying chamber is set to 100 to 120°C, the second hot air drying chamber is set to 120 to 140°C, the third hot air drying chamber is set to 140 to 160°C, the fourth hot air drying chamber is set to 160 to 180°C, and the fifth hot air drying chamber is set to 180 to 200°C.

In this way, as the base fabric (10) is heated stepwise from 100°C to 180 to 200°C by the first to fifth hot air drying chambers and dried with hot air, shrinkage of the fabric due to rapid temperature changes is prevented, and the temperature of the final fifth hot air drying chamber is finely adjusted to precisely complete the desired color development.

2. Dimensional stabilization resin layer coating step (S20)

The dimensionally stable resin layer coating step (S20) according to the present invention is a step of coating a dimensionally stable resin layer (20) with a thickness of 0.1 mm to 0.5 mm on the surface of the base fabric (10) that has undergone the pretreatment step (S10), and then drying it with hot air at 100°C to 160°C.

Here, in the dimension-stabilizing resin layer coating step (S20), the dimension-stabilizing resin layer (20) is coated using a knife coating method.

The above-mentioned dimension-stabilizing resin layer (20) is formed by at least one of sodium hydroxide, potassium hydroxide, and potassium carbonate, and is formed by mixing 28 to 32 parts by weight of at least one vegetable protein selected from gluten, isolated soy protein, hydrolyzed protein, and vegetable amino acids, 18 to 22 parts by weight of liquid natural rubber, 18 to 22 parts by weight of fermented persimmon, 18 to 22 parts by weight of pH 3 to 3.5, and then, based on 100 parts by weight of the above-mentioned liquid natural rubber, 18 to 22 parts by weight of at least one filler selected from powdered cellulose, CMC, high-cell, calcium carbonate, talc, and silicon dioxide, and 8 to 12 parts by weight of at least one drying oil selected from linseed oil, tung oil, poppy oil, perilla oil, soybean oil, hemp seed oil, and castor oil, and then, Based on 100 parts by weight of drying oil, 8 to 12 parts by weight of emulsifiers selected from the group consisting of soy lecithin, oleic acid, solvabilizer (TWEEN80), and apple surfactant are mixed.

Here, the alkaline aqueous solution decomposes vegetable protein to create an emulsion, and when mixed with an acidity regulator and fermented liquid natural rubber, it can prevent coagulation of the liquid natural rubber.

That is, liquid natural rubber can exist stably and maintain a liquid form at pH 3.0 or lower or pH 6.5 or higher, and coagulation occurs within the pH range of 3.0 to 6.5.

In addition, the above vegetable protein is decomposed in a pH 10 alkaline aqueous solution to create an emulsion and adjust the viscosity of the resin, which controls the texture of natural leather, improves the binding force and adhesiveness of the resin, and ensures the safety of the resin.

In addition, the liquid natural rubber is an elastic resinous material, which improves the adhesiveness of the resin and provides texture, elasticity, and stretchability of leather after cross-linking, and can stably exist at pH 3.0 or lower or pH 6.5 or higher to maintain a liquid form, and is formed so that coagulation occurs within other pH ranges (pH 3.0 to 6.5).

In addition, the above-mentioned drying oil has an iodine value of 130 or higher and contains a lot of unsaturated fatty acids, which absorb oxygen and oxidize, polymerize, and condense to stabilize the resin properties so that it is elastic, hard, and does not dissolve well in solvents.

Additionally, the filler provides viscosity control and dimensional stability to the resin.

In addition, the emulsifier has the function of emulsifying the drying oil and evenly dispersing it into each resin, and is provided so that when the resin is dried, the drying oil is evenly combined with the protein, liquid natural latex, fermented sweetener, drying oil, and filler to maintain unity.

Meanwhile, it is desirable to perform a stirring process at 800 to 1,000 rpm for 10 to 20 minutes at each mixing point for each component mixed into the alkaline aqueous solution.

3. Elastic resin layer coating step (S30)

The elastic resin layer coating step (S30) according to the present invention is a step of coating an elastic resin layer (30) with a thickness of 0.1 mm to 0.5 mm on the dimensionally stable resin layer (20), and then drying it with hot air at 100°C to 160°C.

Here, in the elastic resin layer coating step (S30), the elastic resin layer (30) is coated using a knife coating method.

The above elastic resin layer (30) is formed by at least one of sodium hydroxide, potassium hydroxide, and potassium carbonate, and is mixed with 13 to 17 parts by weight of at least one vegetable protein selected from gluten, isolated soy protein, hydrolyzed protein, and vegetable amino acids, 38 to 42 parts by weight of liquid natural rubber, and 38 to 42 parts by weight of fermented persimmon, and then, based on 100 parts by weight of the above liquid natural rubber, 8 to 12 parts by weight of at least one drying oil selected from linseed oil, tung oil, poppy oil, safflower oil, soybean oil, hemp seed oil, and castor oil is mixed, and then, based on 100 parts by weight of the above drying oil, at least one of soy lecithin, oleic acid, solvylanisers (TWEEN80), and apple surfactants is added. It is provided to mix 8 to 12 parts by weight of emulsifier.

Here, the mixture comprising an alkaline aqueous solution, vegetable protein, liquid natural rubber, fermented persimmon, drying oil, and emulsifier constituting the elastic resin layer (30) is the same as the mixture of the dimensionally stable resin layer (20), so a duplicate description is omitted.

Meanwhile, it is preferable to perform a stirring process at 800 to 1,000 rpm for 10 to 20 minutes at each time each compound is mixed into the alkaline aqueous solution.

In addition, the elastic resin layer (30) is formed thicker than the thickness of the dimensionally stable resin layer (20) coating to add elasticity and flexibility to the base fabric (10), or the dimensionally stable resin layer (20) is formed thicker than the thickness of the elastic resin layer (30) coating to add dimensional stability to the base fabric (10).

In this way, by manufacturing vegetable leather with various functions in a simple manner of controlling the coating thickness of the dimensionally stable resin layer (20) and elastic resin layer (30), there is an advantage in that it can provide quality suitable for different fields of use, including clothing, shoes, and bags.

4. Color resin layer coating step (S40)

The color resin layer coating step (S40) according to the present invention is a step of coating a color resin layer (40) with a thickness of 0.1 mm to 0.5 mm on the elastic resin layer (30) and then drying it with hot air at 100°C to 160°C.

Here, in the color resin layer coating step (S40), the color resin layer (40) is coated using a knife coating method.

The above color resin layer (40) is formed by at least one of sodium hydroxide, potassium hydroxide, and potassium carbonate, and is mixed with 13 to 17 parts by weight of at least one vegetable protein selected from gluten, isolated soy protein, hydrolyzed protein, and vegetable amino acids, 28 to 32 parts by weight of liquid natural rubber, 28 to 32 parts by weight of fermented persimmon, 28 to 32 parts by weight of pH 3 to 3.5, and then, based on 100 parts by weight of the liquid natural rubber, 8 to 12 parts by weight of at least one drying oil selected from linseed oil, tung oil, poppy oil, safflower oil, soybean oil, hemp seed oil, and castor oil is mixed, and then, based on 100 parts by weight of the drying oil, at least one of soy lecithin, oleic acid, solvylanisers (TWEEN80), and apple surfactants is mixed. An emulsifier is mixed in an amount of 8 to 12 parts by weight, and at least one colorant among natural dyes, organic pigments, and inorganic pigments is mixed in an amount of 1 to 5 parts by weight based on 100 parts by weight of the total mixture forming the color resin layer (40).

Here, the mixture comprising an alkaline aqueous solution, vegetable protein, liquid natural rubber, drying oil, and emulsifier constituting the color resin layer (40) is the same as the mixture of the dimensionally stable resin layer (20), so a duplicate description is omitted.

Meanwhile, it is preferable to perform a stirring process at 800 to 1,000 rpm for 10 to 20 minutes at each time each compound is mixed into the alkaline aqueous solution.

And, based on 100 parts by weight of the entire mixture constituting the dimensionally stable resin layer (20) and the elastic resin layer (30), at least one colorant among natural dyes, organic pigments, and inorganic pigments is mixed in an amount of 0.1 to 0.3 parts by weight to form a base color expressed by the dimensionally stable resin layer (20) and the elastic resin layer (30), and after the elastic resin layer coating step (S30), the ratio of the colorant mixed in the color resin layer (40) is determined based on the base color of the base fabric (10) coated with the elastic resin layer (30) within a range of mixing 1 to 5 parts by weight of the colorant.

In this way, in the color resin layer coating step (S40), the color of the vegetable leather can be precisely controlled using the color resin layer (40), so that vegetable leather of various colors can be manufactured, as shown in FIG. 4.

In addition, in the dimension-stabilizing resin layer coating step (S20), the elastic resin layer coating step (S30), and the color resin layer coating step (S40), the base fabric (10) is dried by hot air while passing through the first to fifth hot air drying chambers in stages at a speed of 2 to 3 M/m, and the first hot air drying chamber is set to 100 to 120°C, the second hot air drying chamber is set to 120 to 140°C, the third hot air drying chamber is set to 140 to 160°C, the fourth hot air drying chamber is set to 160 to 180°C, and the fifth hot air drying chamber is set to 140 to 160°C.

That is, by setting the drying temperature of the coating layer in the fifth hot air drying chamber lower than that in the fourth hot air drying chamber, the resin layer is stabilized, and shrinkage and deformation of the resin layer due to a rapid temperature difference can be prevented when the coated base fabric (10) is discharged to the outside through the fifth hot air drying chamber.

And, the present invention is formed as a three-layer structure in which the texture, elasticity, stretchability, and physical properties can be controlled according to the coating thickness of the dimensionally stable resin layer (10) and the elastic resin layer (20), and the color is determined by the color resin layer (30) that is finally coated. Here, tannin, liquid natural rubber, and drying agent in the fermented persimmon contained in the dimensionally stable resin layer (20), the elastic resin layer (30), and the color resin layer (40) are mainly composed, and when examining the process in which these components are cured, the tannin in the fermented persimmon goes through a process of curing by polycondensation due to oxidation, cross-linking between isoprene in the liquid natural rubber, and polycondensation due to oxidation of the drying agent.

Accordingly, the bonding between each resin layer is generated by the bonding force between the resin layers as the main components are hardened by heat and oxygen reaction within the machine, that is, the work (process) of applying a separate resin adhesive layer to bond each resin layer by the tannin, liquid natural rubber, and drying agent commonly contained in each resin is omitted, so that the manufacturing process is simplified and the phenomenon of the physical properties being changed by the resin adhesive layer can be prevented, thereby helping to improve the quality of vegetable leather.

Meanwhile, Fig. 2 (a) is a photograph showing a base fabric (10), Fig. 2 (b) is a photograph showing a base fabric (10) that has been pretreated through a pretreatment step (S10), Fig. 2 (c) is a photograph showing equipment for coating resin layers in a dimensionally stable resin layer coating step (S20), an elastic resin layer coating step (S30), and a color resin layer coating step (S40), and Fig. 2 (d) is a photograph showing vegetable leather on which the resin layer coating step has been completed.

In addition, Fig. 4 is a photograph showing vegetable leather manufactured by the manufacturing method of the present invention by color, and since the colors are expressed simply and with high quality, it can satisfy the needs of various consumers, and in particular, since a texture similar to or equivalent to animal leather is expressed, there is an advantage of improved marketability.

10: Base fabric 20: Dimensionally stable resin layer
30: Elastic resin layer 40: Color resin layer

Claims (10)

A pretreatment step (S10) of manufacturing a base fabric (10) by immersing the fabric in a natural dye containing a persimmon fermentation liquid, and then performing a dehydration and drying process; a dimensionally stable resin layer coating step (S20) of coating a dimensionally stable resin layer (20) with a thickness of 0.1 mm to 0.5 mm on the surface of the base fabric (10) that has undergone the pretreatment step (S10), and then drying it with hot air at 100°C to 160°C; an elastic resin layer coating step (S30) of coating an elastic resin layer (30) with a thickness of 0.1 mm to 0.5 mm on the dimensionally stable resin layer (20), and then drying it with hot air at 100°C to 160°C; And a color resin layer coating step (S40) of coating a color resin layer (40) with a thickness of 0.1 mm to 0.5 mm on the elastic resin layer (30) and then drying it with hot air at 100°C to 160°C;
The above-mentioned dimension-stabilizing resin layer (20) is formed by at least one of sodium hydroxide, potassium hydroxide, and potassium carbonate, and is formed by mixing 28 to 32 parts by weight of at least one vegetable protein selected from gluten, isolated soy protein, hydrolyzed protein, and vegetable amino acids, 18 to 22 parts by weight of liquid natural rubber, 18 to 22 parts by weight of fermented persimmon, 18 to 22 parts by weight of pH 3 to 3.5, and then, based on 100 parts by weight of the above-mentioned liquid natural rubber, 18 to 22 parts by weight of at least one filler selected from powdered cellulose, CMC, high-cell, calcium carbonate, talc, and silicon dioxide, and 8 to 12 parts by weight of at least one drying oil selected from linseed oil, tung oil, poppy oil, perilla oil, soybean oil, hemp seed oil, and castor oil, and then, Based on 100 parts by weight of drying oil, 8 to 12 parts by weight of emulsifiers selected from soy lecithin, oleic acid, solvabilizer (TWEEN80), and apple surfactant are prepared.
The above elastic resin layer (30) is formed by at least one of sodium hydroxide, potassium hydroxide, and potassium carbonate, and is mixed with 13 to 17 parts by weight of at least one vegetable protein selected from gluten, isolated soy protein, hydrolyzed protein, and vegetable amino acids, 38 to 42 parts by weight of liquid natural rubber, and 38 to 42 parts by weight of fermented persimmon, and then, based on 100 parts by weight of the above liquid natural rubber, 8 to 12 parts by weight of at least one drying oil selected from linseed oil, tung oil, poppy oil, safflower oil, soybean oil, hemp seed oil, and castor oil is mixed, and then, based on 100 parts by weight of the above drying oil, at least one of soy lecithin, oleic acid, solvylanisers (TWEEN80), and apple surfactants is added. It is provided to mix 8 to 12 weight parts of emulsifier,
The above color resin layer (40) is formed by at least one of sodium hydroxide, potassium hydroxide, and potassium carbonate, and is mixed with 13 to 17 parts by weight of at least one vegetable protein selected from gluten, isolated soy protein, hydrolyzed protein, and vegetable amino acids, 28 to 32 parts by weight of liquid natural rubber, 28 to 32 parts by weight of fermented persimmon, 28 to 32 parts by weight of pH 3 to 3.5, and then, based on 100 parts by weight of the liquid natural rubber, 8 to 12 parts by weight of at least one drying oil selected from linseed oil, tung oil, poppy oil, safflower oil, soybean oil, hemp seed oil, and castor oil are mixed, and then, based on 100 parts by weight of the drying oil, at least one of soy lecithin, oleic acid, solvylanisers (TWEEN80), and apple surfactants is added. It is provided to mix 8 to 12 parts by weight of an emulsifier and mix 1 to 5 parts by weight of at least one colorant among natural dyes, organic pigments, and inorganic pigments based on 100 parts by weight of the total mixture forming the color resin layer (40).
Based on 100 parts by weight of the total mixture constituting the dimensionally stable resin layer (20) and the elastic resin layer (30), at least one colorant among natural dyes, organic pigments, and inorganic pigments is mixed in an amount of 0.1 to 0.3 parts by weight to form a base color expressed by the dimensionally stable resin layer (20) and the elastic resin layer (30).
After the above-mentioned elastic resin layer coating step (S30), the ratio of the colorant mixed in the color resin layer (40) is determined based on the base color of the base fabric (10) coated with the elastic resin layer (30) within the range of mixing 1 to 5 parts by weight of the colorant.
A method for manufacturing a vegetable-based eco-friendly leather having a three-layer structure, characterized in that the elastic resin layer (30) is formed thicker than the thickness of the dimensionally stable resin layer (20) coating to add elasticity and flexibility to the base fabric (10), or the dimensionally stable resin layer (20) is formed thicker than the thickness of the elastic resin layer (30) coating to add dimensional stability to the base fabric (10). In paragraph 1,
A method for manufacturing a three-layer structured plant-based eco-friendly leather, characterized in that the fermented liquid in the above pretreatment step (S10) has an acidity of pH 3 to 3.5. In paragraph 1 or 2,
A method for manufacturing a vegetable-based eco-friendly leather having a three-layer structure, characterized in that in the above-mentioned pretreatment step (S10), tannin contained in the fermented liquid blocks pores in the fiber tissue of the base fabric (10) while binding the fiber tissue, thereby preventing the phenomenon in which the dimension-stabilizing resin layer (20) penetrates to the back of the base fabric (10) in the dimension-stabilizing resin layer coating step (S20). In paragraph 1,
In the above pretreatment step (S10), the base fabric (10) is dried by hot air while passing through the first to fifth hot air drying chambers in stages at a speed of 3 to 5 M/m.
A method for manufacturing a three-layer structured plant-based eco-friendly leather, characterized in that the first hot air drying chamber is set to 100 to 120°C, the second hot air drying chamber is set to 120 to 140°C, the third hot air drying chamber is set to 140 to 160°C, the fourth hot air drying chamber is set to 160 to 180°C, and the fifth hot air drying chamber is set to 180 to 200°C. In paragraph 1,
In the above-mentioned dimension-stabilizing resin layer coating step (S20), elastic resin layer coating step (S30), and color resin layer coating step (S40), the base fabric (10) is dried by hot air while passing through the first to fifth hot air drying chambers in stages at a speed of 2 to 3 M/m.
A method for manufacturing a three-layer structured plant-based eco-friendly leather, characterized in that the first hot air drying chamber is set to 100 to 120°C, the second hot air drying chamber is set to 120 to 140°C, the third hot air drying chamber is set to 140 to 160°C, the fourth hot air drying chamber is set to 160 to 180°C, and the fifth hot air drying chamber is set to 140 to 160°C. delete delete delete delete delete