KR20030037756A - Grain type artificial leather and preparing method thereof using ultra micro fiber non woven suede - Google Patents

Abstract

PURPOSE: Grain type artificial leather is characterized by natural-like leather appearance and texture, improved physical properties, air permeability, the good wearing feel, excellent horizontal strength and tearing strength and deodorization of an oiling agent. And a manufacturing method thereof using superfine yarn non-woven suede is provided. CONSTITUTION: The grain type artificial leather is comprises: a base layer(2) comprising dividing type superfine yarn or sea-island type superfine yarn having 0.0001-0.20denier; a surface layer(3), a grain layer laid raisings in the same direction; a binder coating layer(4) formed on the surface layer(3); a color spray coating layer(5); and a top coating layer(6).

Description

GRAIN TYPE ARTIFICIAL LEATHER AND PREPARING METHOD THEREOF USING ULTRA MICRO FIBER NON WOVEN SUEDE}

The present invention relates to a method for producing a grain-type artificial leather using a grain-type artificial leather and a micro-microfiber non-woven suede, and more specifically, to a conventional super-microfiber nonwoven suede surface silver (grain: Grain layer) By layering, the present invention relates to a method for producing artificial leather of a so-called Nappa or Marble type surface smoothly and smoothly processed, and a grain-type artificial leather produced accordingly.

If leather is classified according to its surface shape, Nappa type coated with silver surface and processed smoothly and smoothly, Sued (commonly known as 'tax') type which is buffed and brushed silver surface, By weakly buffing can be divided into a Marble type representing the intermediate degree between the Napa type and the Sued type. The suede type is further divided into a nubuck, a relatively short bellow, and a medium suede having a relatively long brushed length according to the length of the brushed brush. The main species of natural leather is nappa (grain) type.

When leather is classified according to materials and processing methods, it is roughly classified into natural leather and synthetic leather.

Natural leather is divided into grain layer and split layer by screening the hairs of animal hair such as sheep, cattle or pigs into hairs of a certain thickness, and then sorting them into an emulsion preparation process, an emulsion process, and a finish. Manufactured through a very complex and diverse processing step consisting of the process, it is generally elegant and has a high quality and aesthetic, but it is expensive, heavy, has a peculiar chemical treatment smell, easy to grow mold, weak strength, It has a weak disadvantage in water.

Synthetic leather is a leather made of artificial materials that mimics the appearance of natural leather. Artificial leather or artificial leather may be used without distinction, but may also be used separately.

Artificial leather is referred to in the art as 'leja', a synthetic resin layer such as polyurethane or polyvinyl chloride or the like is formed on a substrate such as knitted fabric or a fiber by wet or dry to form a grain-type silver cotton Then, after performing a printing step such as gravure printing or coloring to form a surface protective film. However, artificial leather can be manufactured only by grain type due to the use of the film coating method, and because of its inferior appearance and texture, it is not only easily distinguished from natural leather, but also has problems such as poor breathability and inferior strength. Due to its low price, its added value is low. In addition, it is not possible to adopt the surface spray coloring coating method, the top coating method, etc., which are essentially used for natural leather, and also cannot perform the high temperature surface treatment method such as ironing, so that the appearance and texture of natural leather Had a problem that could never be expected.

The artificial leather as a conventional synthetic leather to supplement the above-mentioned disadvantages of artificial leather is a porous layer buffing type that forms a wet porous layer of controlled size and length on the surface by the above-described wet method and then buffs it. It can be distinguished into a nylex suede type of buffing cloth impregnated with a microfiber or ultramicrofiber nonwoven fabric developed in the present invention and then buffed. The buffing is usually performed in a cylindrical or belt type by using a buffing roll wound with sandpaper to impart a suede effect such as nubuck, suede, bellow, and the like.

However, artificial suede of the porous layer buffing type still has a problem in that it exhibits only inferior appearance and texture that fall short of natural leather. In addition, the suede of brushed buffing type is recognized as a product having high added value which is close to suede type natural leather in terms of surface touch, volume, etc., and the physical properties are also superior to that of natural leather. Products that have been used for dyeing are commercially available (for example, Kuraray Co., Ltd. "Amara", Toray Co., Ltd. "Exen", Japan Asahikasei Co., Ltd. "Ramos", etc.) Since the thickness is constantly adjusted by buffing after needle punching, there is a problem that the grain type cannot be manufactured and only the sued type can be manufactured.

The demand for natural or synthetic leather is concentrated on grain (napa) type, and the market share of suede type is relatively small, so the appearance and texture such as surface touch and volume are similar to the grain (napa) type of natural leather. Development of artificial leather has been requested in the art.

However, despite the request from the art as described above, the conventional grain type artificial leather has an inherent problem that its appearance and texture are far shorter than that of natural leather, and if the surface spray dye coating method applied to the natural leather is applied, Since the coating liquid passes between the fibers, the coating is not coated, and at the same time, it is vulnerable to heat, and thus there is a problem in that ironing cannot be performed at all, and conventional brushed type suede itself has raised hairs. Being a suede, it has been recognized that it is impossible to make a grain (napa) type leather having a smooth and smooth surface.

Accordingly, the first object of the present invention is to provide a grain (napa) type artificial leather that is similar in nature and its appearance and texture to the extent that it is difficult to distinguish.

A second object of the present invention is to provide a method for producing a grain (napa) type artificial leather according to the first object described above.

According to a preferred aspect of the present invention for achieving the first object of the present invention, a base layer comprising a segmented and island-type ultrafine yarn of 0.0001 ~ 0.20 denier; An epidermal layer formed with the raised surface of the upper surface of the substrate layer lying in the same direction; Binder layer on the epidermal layer; Color spray coating layers; And a top coating layer: the weight is 250-380 g / m ² , the tensile strength is 8.0-15 kg / cm, the tear strength is 4.0-5.0 kg / cm, and the air permeability is 0.8-1.2 cm ³ / cm ^2. A grain type artificial leather is provided, which is sec.

According to a preferred aspect of the present invention for achieving the second object of the present invention, the substrate layer providing step consisting of divided and / or island-in-the-sea ultrafine yarn of 0.0001-0.20 denia having a brush length of 0.01 ~ 0.10mm; A hair removal and depletion step of treating the substrate layer under a pressure of 20 to 35 tons / cm ² , a temperature of 140 to 180 ° C., and a roll passing speed of 10 to 30 m / min; And a binder coating step for preventing re-establishing of the brush and imparting the texture of the natural leather.

1 is a cross-sectional view of the grain type artificial leather of the present invention.

2 is a schematic diagram illustrating a manufacturing method of the present invention.

Fig. 3A is an enlarged plan view of the suede surface of the ultra-fine microfiber suede substrate used in the present invention, Fig. 3B is an enlarged cross-sectional view of the suede side, and Fig. 3C is a diameter comparison diagram of the ultrafine fibers and the hair.

-Explanation of symbols for the main parts of the drawings-

1: artificial leather of the present invention 2: ultra-fine fiber substrate

3: pressed and consumed layer 4: binder coating layer

5: dye coating layer 6: top coating layer

7: base material 10: water-repellent assembly

11: padding roll 12: water repellent coating roll

13: water repellent 14: water repellent

15: guide roll 20: washing assembly

21, 27: guide roll 22, 23, 28: nip roll

24: support roll 25: washing tub

26: washing liquid 30, 80: drying assembly

31,81 tenter 32,33 nip roll

40: press and exhaust assembly 41: press roll

42: heating roll 50: binder spray coating assembly

51: coating liquid spraying line 52: nozzle

53: coating booth 60: ironing assembly

61,62: Iron Roll 70: Color Spray Coating Assembly

71: coating liquid injection line 72: nozzle

73: coated boot 110, 120: winding roll

The present invention is an artificial leather substrate having a functional property such as surface touch and appearance very similar to the grain type natural leather by performing the consumption and compression treatment and the binder coating treatment on the suede surface of the ultra-microfiber composite filament suede (基材) ) And then apply the spray coating method that can be applied only to the natural leather as it is to the artificial leather base as described above, thereby providing a completely new type of grain type artificial which has physical properties exceeding the natural leather and almost completely complements the disadvantages of the natural leather. Provide leather.

In other words, the present invention is made by changing the suede surface on which the brushed surface of the ultra-microfiber synthetic fiber suede substrate having an appearance and texture that is much similar to that of the suede type natural leather is formed into a grained surface (silver surface) than any of the known substrates. In addition, by coating the surface with the same coating as natural leather, the appearance and texture are almost indistinguishable from natural leather, while its physical properties are superior to natural leather, It offers an entirely new type of artificial leather that perfectly complements the high price, high weight, smell of treatment chemicals, tearing and water susceptibility.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

First, Figure 1 is a schematic cross-sectional view of the grain type artificial leather (1) of the present invention, the microfiber substrate (2), skin layer (3), binder coating layer (4), color spray coating layer (5) and top coating layer in order from the bottom (6) is formed.

In the drawings, each layer is illustrated as clearly distinguishable, but this is for convenience of explanation and illustration, and in reality, each boundary may not be obvious, and each layer penetrates into another layer.

The microfiber substrate 2 is composed of 0.0001-0.20 denia, preferably 0.001-0.07 denia, divided and / or island-in-the-sea microfiber yarns, such as woven fabrics such as plain weave, twill weave, and runner weave, such as tricot or media. Any of the same knitted form, a filamentous form such as Nylex, a polyurethane processing, an acrylic treatment, or a felt nonwoven form may be used, but a filamentous form or a nonwoven form may be preferable in consideration of ease of dyeing. have.

FIG. 3A is an enlarged plan view of the sued surface (napping surface) side of the ultra-microfiber suede substrate used in the present invention, and it can be seen that numerous raisings are formed, and FIG. 3B is FIG. A suede enlarged cross-sectional view of the sued substrate can identify the raised part such as hair, and FIG. 3C shows a comparison of the diameter of the microfiber and the hair. The left side is a single hair and the right side is a microfiber.

On the upper surface of the substrate 2, a skin layer 3 is formed in which a plurality of raised hairs extending from the substrate 2 are laid in the same direction. A layer of 0.0001-0.20 denia microfibers having a brushed length of 0.01-0.10 mm, preferably 0.02-0.05 mm, lying in a constant direction, wherein the skin layer 3 presses the substrate 2 at a pressure of 20-35 tons / It is a layer subjected to hair loss and exhaustion under conditions such as cm ² , a temperature of 140 to 180 ° C., and a roll passage speed of 10 to 30 m / min. It is important that the skin layer 3 is slightly microfiber brushed (not shown) to be fused to the surface of the substrate 2 while the surface of the substrate 2 does not undergo substantial physicochemical changes, and this condition is the thickness of the substrate layer. The optimum value may need to be selected by a trial-and-error technique because it may be changed by various parameters such as temperature, material, substrate layer, outside air temperature, and brushing length. When excessively applied and consumed or delayed through the substrate 2, the surface of the substrate 2 is directly melted and hardened to form a hardened layer. In this case, the substrate 2 becomes excessively stiff and becomes uncommercial. Be cautious as it may result. In addition, care should be taken because too low the shaping pressure and consumption temperature, or too fast a speed of passage of the substrate 2, may cause a problem that the brushing does not lie down sufficiently or becomes upright again.

In order to permanently fix the epidermal layer 3 to which the napping is laid in a predetermined direction on the surface of the base material 2 by the above-mentioned shaping and depletion treatment, the cationic binder is coated, and then the binder is cured by ironing to bind the binder coating layer. (4) is formed. As the binder, a polyurethane-based and / or acrylic copolymer may be used, and may include oil and / or wax. In addition, the binder coating layer 4 may be used by mixing a pigment conventionally used in the art for the cover effect and natural color expression. The binder used in the binder coating layer 4 is preferably cationic so as to exhibit good binding with the ultrafine yarn, but is not excluded from being nonionic or anionic.

A color spray coating layer 5 is formed on the binder coating layer 4 described above, which is exactly the same as the layer used in a normal natural leather processing process, and is matched to the color required by the business community and the consumer. It is a layer for producing a two tone effect or the like.

The top coating layer 6 is formed on the color spray coating layer 5, and the top coating layer 6 is a layer applied to provide durability by adjusting the glossiness of the surface of the fabric and increasing wear resistance, water resistance, bending resistance, and the like. It is a layer formed tolerantly in the treatment of natural leather.

The grain type artificial leather 1 according to the present invention is not limited thereto, but generally has a weight of 250 to 380 g / m ² , a tensile strength of 8.0 to 15 kg / cm, and a tear strength of 4.0 to 5.0 kg / cm. The air permeability is in the range of 0.8 to 1.2 cm ³ / cm ² · sec.

The grain type artificial leather of the present invention having the layer structure as described above has the appearance and texture very similar to the grain type natural leather, and is thus almost indistinguishable from the grain natural leather, and its physical properties surpass those of the natural leather. At the same time, it completely compensates for the disadvantages of natural leather, such as high price, high weight, odor of processed chemicals, tear and water.

Figure 2 is a schematic diagram illustrating a manufacturing method of the present invention, the grain type artificial leather according to the invention substrate providing step, water repellent step, washing step, drying step, pressing and consuming step, binder coating step, ironing step, color It is illustrated schematically that it can be produced via the spray coating step, the drying step, and the like.

A. Substrate provision step:

A substrate 7 composed of divided and / or island-in-the-sea microfibers having a brushed length of 0.01 to 0.10 mm, preferably 0.02 to 0.05 mm, preferably 0.0001 to 0.20 denia, preferably 0.001 to 0.07 denia, is wound on the take-up roll 110. Provided by us. Since the type of substrate and the like have been described above, the description is no longer necessary.

B. Water repellent treatment steps:

In the water repellent treatment step, the substrate 7 is treated with a water repellent so that the dye does not penetrate into the floor during dyeing, so that the coating can be smoothed.

The water repellent assembly 10 is passed through the substrate 7 through the nip between the water repellent coating roll 12 and the padding roll 11 having one end immersed in the water repellent liquid 14 of the water repellent tank 13. The water repellent fluid 14 is coated on the substrate 7. In the figure, reference numeral 15 is a guide roll.

Such a water repellent treatment is a process commonly used in the art, and the water repellent is Dupont's trade name Teflon, 3M's scotchgard, OLEOPHBOL, FC-5102, Asahi Kasei's fluorine-based water repellent, etc. Can be purchased commercially and used. The initial water repellency is at least 80%, preferably at least 90%. The treatment temperature may be post-water repellent treatment by the bathing method or roll type at 80-170 degreeC, Preferably it is 90-150 degreeC. In order to increase the water repellency, a bathing method using a synthetic repellent water repellent may be effective. Although not shown in FIG. 2, the water-repellent treatment is performed by mixing 1-5 wt% water repellent, about 0.1-1 wt% antistatic agent and a small amount of other additives, etc. in water in a state where dyeing and washing with a bath are completed. It can be carried out by passing at a rate of about 5 ~ 15m / min at the above temperature.

C. Washing Steps:

This step can be used to give a soft texture, such as natural leather, and about 1 to 5% by weight of softener (Conk) and 1 to 3% by weight of antistatic agent are mixed with water at room temperature, then immersed and Turn minutes, preferably 15-25 minutes, you can get a soft base like natural leather. How soft the paper is made is directly related to the softness of the final artificial leather. In particular, this step removes dye residues and contaminants remaining in the syntheses.

The washing assembly 20 washes the tub 25 by alternately passing the water-repellent substrate 7 guided by the guide roll 21 between the plurality of nip rolls 22, 23 and the support roll 24. It washes by passing through the wash liquid 26 as described above. In the figure, reference numeral 27 is a guide roll, and 28 is a nip roll.

D. Drying Steps:

In the drying step, the drying assembly 30 is flattened and dried in a tenter 31. The substrate 7 which has passed through the tenter 31 is transferred to the pressing and consuming steps via the nip rolls 32 and 33.

E. Condensation and Consumption Stages:

The substrate 7 in the sued state via the washing step (or via the washing step and the drying step) passes through the pressing and consuming assembly 40 composed of the pressing roll 41 and the heating roll 42. The base material 7 is subjected to hair removal and depletion under conditions such as a pressure of 20 to 35 tons / cm ² , a temperature of 140 to 180 ° C., and a roll passing speed of 10 to 30 m / min. (See FIG. 1) is formed, and since the length of the brushing, the brushing, and the waste treatment have been mentioned in detail above, further description thereof will be omitted.

F. Binder Spray Coating Steps:

In the binder spray coating step, the cationic binder is coated in order to permanently fix the epidermal layer 3 (see FIG. 1), which is formed of the brushed bed lying in a constant direction in the pressing and consuming steps.

The binder coating assembly 50 is composed of a booth 53 and a coating liquid spray line 51 and a nozzle 72 installed therein. Coating of the binder may be carried out by various known methods, but continuous spray coating is preferable in view of minimizing the effects on lying down and considering process efficiency and the like.

Although the above-described binder has been described above, in more detail, the binder used in the binder spray coating step may use any of those based on a polyurethane-based polymer or an acrylic copolymer, and cationics commonly used in the art. , Anionic or nonionic pigments, and waxes, oils and the like.

This binder coating exhibits not only the effect of fixing the epidermal layer 3 by brushing permanently, but also the surface covering effect and the expressive effect of natural color.

As the above-mentioned binder, but not limited to, it is preferable to use a cationic polyurethane binder, which will fix the napping and give the surface texture and appearance of the natural leather, and commercially, for example, an aliphatic polyurethane cationic binder The brand name PU-340 of Ve-Pi, Italy can be used.

In addition, in order to maximize the sealing effect, in addition to the above-mentioned aliphatic polyurethane cationic binder, a cationic compact binder (e.g., a brand name as a mixture of polyurethane / acryl copolymer / wax, etc. of Dai Nippon Ink Chemicals, Japan), LCC Cation Bottom AZ-5 ) Can be mixed. When using such a cationic compact binder, the ratio of the above cationic polyurethane binder: cationic compact binder is 1: 0.5 to 1: 2.5 by weight, preferably 1: 1 to 1: 2.

In addition, in the binder coating liquid, oils, in particular cationic oils, may be added to increase the bulkiness of the coating and to impart chemical resistance. Such oils are commercially available and include, for example, the trade name Eukesol Oil Ground, a cationic oil emulsion from BASF, Germany. When used, the ratio of cationic polyurethane binder: cationic oil is 1: 0.5 to 1: 2.5 by weight, preferably 1: 1 to 1: 2.

In addition, wax components, especially cationic waxes, may be added to give a natural feel and a soft, silky touch. Such oils are commercially available and include, for example, the trade name Vepiwax FG, a weak cationic synthetic wax from VE-Pi, Italy. When used, the ratio of cationic polyurethane binder: wax is 1: 0.5 to 1: 1.5 by weight, preferably 1: 0.8 to 1: 1.2.

It is also possible to use a mixture of cationic, nonionic and anionic pigments conventionally used in the art for the cover effect and natural color expression, preferably cationic pigments. Such pigments are also commercially available, such as K-series pigments from VE-Pi, Italy. When used, the ratio of cationic polyurethane binder: pigment is arbitrary but in the weight ratio of about 1: 0.2-1: 1.0.

As described above, the binder coating liquid, the amount of use thereof, the number of injections, and the like may be easily adjusted to various parameters such as the type of leather to be manufactured, the requirements of the consumer, and the like.

In the case of the nappa type, it may be desirable to mix all of the above components, but in the case of the marble type, it may be preferable not to add a cationic compact binder. In addition, in the case of napa type, it may be desirable to inject 1 to 3 times in an amount of 2 to 5 g in one injection, and in the case of marble type, it is preferable to inject 1 to 3 times in an amount of 2 to 4 g in one injection. You can, but this is arbitrary.

In addition, the binder may be used after dilution with a solvent to have a viscosity suitable for spraying.

G. Ironing Steps:

The substrate 7 having the binder coated thereon is between the nips of a pair of cylindrical roll irons 61 and 62 at a temperature of 100 to 145 ° C, preferably 120 to 138 ° C, which constitute the ironing assembly 60. The binder coating smoothly seals and covers the surface of the substrate 7 by passing it at a moving speed of 30 to 70 m / min under a pressure of 20 to 50 bar, preferably 25 to 40 bar, further improving the feel and texture of the natural leather. Can be shown.

In addition to the smooth type, the roll irons 61 and 62 described above may use a high-cell punch iron roll or embossing roll, which makes pores of natural leather, if necessary.

H. Color Spray Coating Steps:

The color spray coating assembly 70 is configured in the same manner as the binder coating assembly 50 described above, and includes a boot 73 and a coating liquid spray line 71 and a nozzle 72 installed therein. Color spray coating is carried out using known methods and color spray solutions applied to grain type natural leather.

Color spray coating, as in the case of natural leather manufacturing, is a step for producing effects such as color and two-tone effect required by the consumer, and the substrate 7 of various colors is made.

Unlike the continuous case as shown in FIG. 2, in the case of batch treatment, the fabric is blown to the injection pressure by using an automatic injection machine capable of low pressure injection, so that the coating may be unbalanced, so that the defect does not occur. There is a need.

Color spraying is generally performed three to four times continuously, but the number of spraying may be arbitrarily increased or decreased depending on the color or coating cover state.

I. Drying Steps:

In the drying step, the substrate 7 is spread out and dried in the tenter 71 of the drying assembly 70. The base material 7 which has passed through the tenter 71 will pass through a nip roll (not shown). The tenter 71 is provided with various types of heating means (not shown) such as a heater, a gas dryer, a ceramic electric dryer, a high frequency oscillation dryer, and the like.

The drying temperature may be suitable 60 ~ 100 ℃, preferably about 90 ℃. Such heating conditions can be appropriately changed depending on the external temperature, humidity, and the like. In addition, the drying speed may be adjusted according to the injection amount per one injection number, and is generally dried in the tenter 71 having a length of about 8-14 m.

J. Top Coating Steps:

The topcoating step (not shown in FIG. 2) can be performed using a coating assembly similar to the binder spray assembly 50 or the color spray coating assembly 70, adjusting the gloss of the substrate 7 surface and abrasion resistance. In order to increase the water resistance, the flex resistance, and the like to make the durable base material 7. Such top coatings are known in the field of natural leather processing and the top coating liquids are also known. Although the top coating liquid differs depending on the substrate 7, nitrocellulose top lockers are generally used, and polyurethane top lockers are used when strong durability is required.

K. Complete Ironing Steps:

Although not shown in FIG. 2, the artificial leather substrate 7 having all the processing steps completed is ironed by using an iron roll for adjusting gloss and controlling surface roughness and smoothness according to an item or a consumer's request. It adds value to the finished product.

Generally, it is ironed with a cylindrical wool felt iron, and when it is required to have a shiny gloss, it is a private iron ironing using a smooth roll, and when it is made of a dull type, a mesh (sand) )) Finish with iron roll.

L. Finishing Steps:

The grain-type artificial leather fabric finished according to the manufacturing method of the present invention is cut to a predetermined dimension or wound using a take-up roll 120.

In cutting, it is possible to mark the gauge dimension using the gauge and to record the production yield.

So far, the production of grain-type artificial leather according to the present invention has been described on the basis of a continuous manufacturing method, but each of the above steps can be produced in a batch manner, of course. However, in order to increase the work efficiency and to maintain a better even surface state, it is preferable to perform the continuous winding process. According to the continuous winding process, not only the quality improvement but also the cutting loss caused by cutting can be reduced a lot, which is more preferable.

Hereinafter, the present invention will be described in more detail with reference to Examples, but these Examples are only described as the best embodiment for illustrating the present invention, it should be understood that it is not intended to limit the present invention.

(Example)

Example 1 Preparation of Napa Type Artificial Leather

0.01 denier, and even if the dividing type of microfiber-based blankets (average brushed length 0.03mm) (trade name Nylex, black) as the needle-like polyurethane also 1m ² as a water repellent agent containing 3M's FC-5102 3% by weight of the antistatic agent is 0.5% by weight The water-repellent treatment was carried out by immersion for 6 seconds in a water-repellent bath containing an aqueous solution having a temperature of 95 ° C. (initial water repellency of 93%).

Subsequently, the substrate was washed and softened by rotating at a rate of 100 rpm per minute for 20 minutes in water at about 30 ° C. containing 3% by weight of a softener manufactured by Conk and 2% by weight of an antistatic agent. The washed substrate was rolled and pressed for 3 seconds under conditions of a pressure of 28 tons / cm ² and a temperature of 160 ° C.

The roll pressed substrate was prepared by using a cationic polyurethane binder (10 wt% (Italy, Ve-Pi, trade name PU-340), a cationic compact binder (15 wt% of Japan, Dai Nippon Ink Chemicals, trade name LCC Cation Bottom AZ-5), 15% by weight of nonionic oil (Germany, BASF, trade name Eukesol Oil Ground), 10% by weight of cationic wax (Italy, VE-Pi, trade name Vepiwax FG), 7% by weight of cationic pigment (Italy, VE-Pi, K- 2) and spray coating the binder coating liquid consisting of the residual solvent twice in an amount of 4 g in one spraying, and then pressing it at a pressure of 30 bar with a cylindrical smooth roll iron having a surface temperature of 135 ° C of 3,200 mm diameter. Pressed for seconds.

Subsequently, a color spray coating liquid consisting of commonly used black pigment for natural leather, acrylic / polyurethane binder, oil, wax and water, etc., known in the natural leather industry, was spray-coated three times in an amount of 5 g per spray, and then 90 It was dried sufficiently at 캜.

Natural coating industry-known conventional top coating liquid (butyl acetate / ethyl cellosolve / oil touch / silicon-containing nitrocellulose-based lacquer) was coated once in an amount of 3 g per spraying, and then 3,200 mm diameter wool felt iron Ironed by roll.

Example 2 Preparation of Marble Type Artificial Leather

10 wt% cationic polyurethane binder (Italy, Ve-Pi, trade name PU-340), 15 wt% nonionic oil (Germany, BASF, trade name Eukesol Oil Ground) ), 10% by weight of a cationic wax (Italy, VE-Pi, trade name Vepiwax FG), 7% by weight of a cationic pigment (Italy, VE-Pi, K-2), and a binder coating liquid consisting of a residual solvent Spray coating twice in an amount of 3 g, and then pressed for 1.2 seconds with a cylindrical smooth roll iron having a surface temperature of 135 ° C. of 3,200 mm diameter at a pressure of 30 bar.

Subsequently, after spraying three times the color spray coating liquid commonly used in processing of the natural leather industry known in the natural leather industry in an amount of 5 g per one spraying, and then sufficiently drying at 90 ° C., in the processing of the marble natural leather known in the natural leather industry. A conventional topcoating solution (cellosolve mixture / oil touch / silicone containing polyurethane top locker) was coated once in an amount of 2 g per spray and then ironed with a 3,200 mm diameter wool felt iron roll.

Test Example 1 Sensory Evaluation of Texture by Appearance and Surface Touch

Thirty persons, each male and female in their 20s to 40s, were blind-tested for their appearance evaluation and touching texture evaluation of black grain type artificial leather and black cowhide natural leather prepared in Example 1 of the present invention. The results are shown in Table 1 below.

In the evaluation method, the appearance was evaluated by visual observation only without a touch, and then the texture was evaluated by touching, and both evaluations were performed independently (the number is the number of evaluation personnel).

Exterior Texture Best Good usually Poor Best Good usually Poor Artificial leather of Example 1 9 17 3 One 0 18 9 3 Natural leather 6 18 4 2 3 24 2 One

From the results of Table 1, the grain-type artificial leather according to the present invention has an amazing result showing the appearance that is more real than the genuine natural leather in appearance, and hardly inferior to the natural leather even in the texture evaluation by touch. It was confirmed that excellent results were obtained.

Test Example 2: Evaluation of Physical Properties

Table 2 shows the physical property results obtained by requesting the grain-type artificial leather and the natural leather in Test Example 1 from the Korea Textile Inspection & Testing Institute (KOTITI).

Item Example 1 Natural Leather Test Methods Weight (gr / m ² ) 318.5 492.2 KS K 0514 Tensile Strength (W) (kg / cm) Tensile Strength (L) (kg / cm) 12.38.2 9.120.6 KS M 6888 Tear Strength (Horizontal) (kg / cm) Tear Strength (Horizontal) (kg / cm) 4.54.4 2.52.6 KS M 6888 Air permeability (cm ³ / cm ² ㆍ sec) 1.0 Less than 0.05 KS K 0570 thickness 0.84 mm 1.0 mm

From the results in Table 2, it can be seen that the physical properties of the grain type artificial leather of the present invention almost completely compensate for the disadvantages of natural leather.

As described above, the grain type artificial leather of the present invention manufactured according to the manufacturing method of the present invention is an entirely new concept of grain type artificial leather combining the appearance and texture of natural leather and the advantages of synthetic fiber products.

The grain-type artificial leather of the present invention is almost indistinguishable from the appearance of natural leather, and the texture is almost cool, and its physical properties almost completely cover the disadvantages of natural leather. Specifically, natural leather has little breathability, while the grain type artificial leather of the present invention has relatively high breathability compared to natural leather and its weight is only about 65% compared to natural leather, so the appearance is elegant and luxurious. Wearing is not only good at lightness, but also excellent in lateral strength, especially at high tear strength, so it is not easily torn and free from the disgusting smell peculiar to chemicals added in the tanning process in natural leather. There is this.

Accordingly, the present invention is expected to create a new demand in the field of leather by providing a grain-type artificial leather that exceeds the natural leather in terms of function, while surpassing that of the natural leather. It is expected to satisfy consumer's desire for natural leather as an environmentally friendly material that opens up the possibility of solving the problem of animal protection and natural leather processing industry, which is inherently environmental pollution industry.

In addition, it is expected to be able to provide a way to the natural leather industry of stagnation and at the same time, to position itself as a new product material of synthetic fiber products.

Claims (20)

A base layer composed of 0.0001-0.20 denia split type and island-in-the-sea ultrafine yarns, a skin layer as a grain layer formed by raising the upper surface of the base layer in the same direction, and the aforementioned A grain type artificial leather comprising a binder coating layer formed over the skin layer. A base layer composed of a divided and island-in-the-sea ultrafine yarn of 0.0001 to 0.20 denia; An outer skin layer as a grain layer in which the raised surface of the upper surface of the base material layer is formed in the same direction; A binder coating layer formed on the skin layer; Color spray coating layers; And Composed of top coating layer Grain type artificial leather. The grain type artificial leather according to claim 1 or 2, wherein the artificial leather has a weight of 250 to 380 g / m ² and an air permeability of 0.8 to 1.2 cm ³ / cm ² · sec. The grain type artificial leather according to claim 1 or 2, wherein said artificial leather has a tensile strength of 8.0 to 15 kg / cm and a tear strength of 4.0 to 5.0 kg / cm. The grain-type artificial leather according to claim 1 or 2, wherein the skin layer of the artificial leather is formed by superficial hair removal and depletion treatment of 0.0001-0.20 denia having a length of 0.01-0.10 mm. . The grain type artificial leather according to claim 1 or 2, wherein the base layer is in the form of a woven fabric, a knitted fabric, a fiber, or a nonwoven fabric. The grain type artificial leather according to claim 1 or 2, wherein the binder coating layer is a polyurethane and / or an acrylic copolymer layer. 8. The grain type artificial leather according to claim 7, wherein said binder coating layer also comprises a pigment. The grain type artificial leather according to claim 1 or 2, wherein the grain is Napa or Marble type artificial leather. Method for producing a grain type artificial leather comprising the following steps: (A) providing a base layer composed of divided and / or island-in-the-sea ultrafine fibers of 0.0001-0.20 denia having a brushed length of 0.01-0.10 mm; (B) a hair removal and depletion step of treating the substrate layer under a pressure of 20 to 35 tons / cm ² , a temperature of 140 to 180 ° C., and a roll passing speed of 10 to 30 m / min; And (C) Binder coating step to prevent re-establishment of brushed and to give texture of natural leather. The method of producing a grain type artificial leather according to claim 10, wherein the binder is a cationic polyurethane. The method for producing a grain type artificial leather according to claim 10, wherein the binder is a cationic polyurethane and an acrylic copolymer as a main agent, and the ratio of both is 1: 0.5 to 1: 2.5 by weight. The method of producing a grain-type artificial leather according to any one of claims 10 to 12, wherein the ratio of the cationic polyurethane binder: pigment in which the binder is further included in the pigment is 1: 0.2 to 1: 1.0 by weight. The method of claim 10, wherein the binder comprises an oil and a wax, and the ratio to the cationic polyurethane binder described above is in weight ratios of 1: 0.5 to 1: 2.5 and 1 :, respectively. A method for producing a grain type artificial leather in the range of 0.5 to 1: 1.5. 11. The method of claim 10, further comprising the step (D) water repellent treatment at a temperature of 80 ~ 170 ℃ subsequent to the substrate layer providing step, the initial water repellency of 80% or more. The method according to claim 15, wherein (E) the washing step is further performed subsequent to the water repellent treatment step, and the washing step comprises stirring and dipping for 10 to 100 minutes in a room temperature washing liquid including an antistatic agent and a softening agent. The manufacturing method of the grain type artificial leather which becomes. The grain type artificial leather according to claim 10 or 15, further comprising (F) ironing at a temperature of 100 to 145 ° C and a pressure of 20 to 50 bar following the color spray coating step described above. Manufacturing method. 18. The method of claim 17, wherein the ironing in the ironing step is performed through a nip of a pair of cylindrical iron rolls, wherein at least one of the pair of cylindrical iron rolls is smooth, high cell punched or embossed. Manufacturing method of grain type artificial leather. 18. The process according to claim 17, subsequent to the above ironing step, a known (G) color spray coating step, (H) drying step, (I) topcoating step and (J) finished ironing step applied to natural leather. Method for producing a grain-type artificial leather to perform more. The method for producing a grain type artificial leather according to claim 10, wherein said grain is Nappa or Marble type artificial leather.