Method for manufacturing artificial leather

Abstract

The present invention relates to a method for manufacturing artificial leather. Provided, according to the present invention, is a method enabling the manufacturing of artificial leather having a rich napped texture and excellent mechanical properties.

Description

Method for manufacturing artificial leather

[0001] The present invention relates to a method for manufacturing artificial leather.

[0002]

[0003] A key factor in determining the quality of suede-like artificial leather is its feel. The rich texture, similar to that of natural leather, is one reason artificial leather is used not only in the fashion and apparel industries, but also in diverse industries such as furniture and automotive seats.

[0004] A method for producing suede-like artificial leather by micronizing sea-island fibers is known in the art. According to this method, a needle-punched nonwoven fabric is produced from sea-island fibers, and then the fibers are subjected to several steps of treatment with an organic solvent to remove the sea-island component and micronize the fibers.

[0005] However, the manufacturing method described above involves the use of potentially hazardous materials, such as boric acid, in the process of removing harmful components from the fibers, and the use of high-concentration organic solvents to increase process efficiency. These process conditions are not only harmful to the human body and the natural environment, but also contribute to the stiffness of the resulting artificial leather and its deterioration in mechanical properties.

[0006] In addition, according to the above manufacturing method, the space occupied by the sea component in the above-mentioned sea-type fiber becomes empty during the ultra-fine process, and therefore, there is a limit to expressing a rich nap with only the sea component.

[0007]

[0008] The present invention provides a method for manufacturing a suede-like artificial leather having a rich texture and excellent mechanical properties.

[0009]

[0010] According to one embodiment of the invention,

[0011] A step for manufacturing a needle-punched nonwoven fabric using a polyamide-polyester split composite yarn;

[0012] A step of shrinking the above needle-punched nonwoven fabric to obtain a shrink fabric;

[0013] A step of obtaining an impregnated cloth by immersing the shrinkage cloth in a solution containing a polymer elastomer;

[0014] A step of treating the above impregnated cloth with an alkaline aqueous solution to obtain an impregnated cloth in which the split composite yarn is made into ultrafine pieces; and

[0015] A step of grinding the surface of the above-mentioned ultra-fine impregnated fabric to obtain artificial leather with a raised texture.

[0016] A method for manufacturing artificial leather, including:

[0017]

[0018] In one embodiment, the polyamide-polyester split composite yarn is a 4-split composite yarn, an 8-split composite yarn, a 16-split composite yarn, or a 32-split composite yarn.

[0019]

[0020] In one embodiment, the polyamide-polyester split composite yarn comprises 20 to 30 wt% polyamide and 70 to 80 wt% polyester.

[0021]

[0022] According to one embodiment, the polyamide-polyester split composite yarn has a fineness of 1.5 denier to 3 denier.

[0023]

[0024] According to one embodiment, the step of obtaining the shrinkage foam is performed by heat treating the needle-punched nonwoven fabric at a temperature of 90° C. to 120° C.

[0025]

[0026] In one embodiment, the impregnated fabric comprises 15 to 35 wt% of the polymer elastomer based on the weight of the impregnated fabric.

[0027]

[0028] According to one embodiment, the alkaline aqueous solution is an aqueous solution containing an alkaline compound at a concentration of 0.5 to 1.5% (w / w).

[0029]

[0030] According to the present invention, a method for producing artificial leather having a rich nap and excellent mechanical properties is provided. The method for producing artificial leather utilizes a polyamide-polyester split composite yarn and performs a micronization process under mild conditions, thereby minimizing the loss of the composite yarn's constituent components, thereby providing artificial leather having a rich nap and excellent mechanical properties.

[0031]

[0032] FIG. 1 is a cross-sectional view schematically showing a cross-section of a polyamide-polyester split composite yarn applied to a method for manufacturing artificial leather according to an embodiment of the invention.

[0033] Figure 2 is an image of a cross-section of a polyamide-polyester split composite fiber according to Example 1 observed using a scanning electron microscope.

[0034] Figure 3 is an image of a cross-section of a sea-type fiber according to Comparative Example 1 observed using a scanning electron microscope.

[0035] <Explanation of symbols>

[0036] 10: Polyamide-polyester split composite yarn

[0037] 1: Polyamide component

[0038] 2: Polyester component

[0039]

[0040] Hereinafter, a method for manufacturing artificial leather according to an embodiment of the invention will be described in more detail.

[0041]

[0042] Unless explicitly stated otherwise in this specification, terminology is used only to describe specific embodiments and is not intended to limit the invention.

[0043] As used herein, the singular forms also include the plural forms unless the context clearly dictates otherwise.

[0044] As used herein, the term "including" means specifying a particular characteristic, region, integer, step, operation, element and / or component, but does not exclude the presence or addition of other particular characteristics, regions, integers, steps, operations, elements, components and / or groups.

[0045] In this specification, terms including ordinal numbers, such as "first" and "second," are used to distinguish one component from another and are not limited by the ordinal numbers. For example, within the scope of the present invention, the first component may also be referred to as the second component, and similarly, the second component may be referred to as the first component.

[0046] As used herein, "denier" is a unit of fineness based on the mass (grams) per 9000 meters of fiber length. For example, 1 denier can be expressed as 1 g / 9000 m, or 0.11 mg / m, or 0.11 tex.

[0047]

[0048] According to one embodiment of the invention,

[0049] A step for manufacturing a needle-punched nonwoven fabric using a polyamide-polyester split composite yarn;

[0050] A step of shrinking the above needle-punched nonwoven fabric to obtain a shrink fabric;

[0051] A step of obtaining an impregnated cloth by immersing the shrinkage cloth in a solution containing a polymer elastomer;

[0052] A step of treating the above impregnated cloth with an alkaline aqueous solution to obtain an impregnated cloth in which the split composite yarn is made into ultrafine pieces; and

[0053] A step of grinding the surface of the above-mentioned ultra-fine impregnated fabric to obtain artificial leather with a raised texture.

[0054] A method for manufacturing artificial leather, including:

[0055]

[0056] As a result of the research of the present inventors, the method for manufacturing the artificial leather can provide an artificial leather having a rich nap and excellent mechanical properties by applying a polyamide-polyester split composite yarn and performing an ultrafine treatment under mild conditions, thereby minimizing the loss of the constituent components of the composite yarn.

[0057] The above polyamide-polyester split composite yarn may be partially split by physical impact during the manufacturing process of the needle-punched nonwoven fabric. Furthermore, during the shrinkage process for the needle-punched nonwoven fabric, and during the process of treating the impregnated fabric with an alkaline aqueous solution, any portion that was not split in the previous steps may be split to complete the process of ultrafine fiberization.

[0058] Through this series of steps, the polyamide-polyester split composite yarn can be made ultrafine under mild conditions, with almost no loss of fiber due to weight loss in the process.

[0059] Accordingly, the manufacturing method according to the embodiment of the invention enables the provision of artificial leather having rich texture and excellent mechanical properties.

[0060]

[0061] According to one embodiment, a step of manufacturing a needle-punched nonwoven fabric using a polyamide-polyester split composite yarn is performed.

[0062] The above steps can be performed by a method of producing a polyamide-polyester split composite yarn, cutting the same to produce single fibers, and needle-punching the single fibers to form a nonwoven fabric.

[0063]

[0064] The above polyamide-polyester split composite yarn (hereinafter referred to as “split composite yarn”) includes a first component that is polyamide and a second component that is polyester, and has a cross-section in which the first component and the second component are adjacent.

[0065] Here, the polyamide may be at least one selected from the group consisting of nylon 6, nylon 66, nylon 46, nylon 11, nylon 12, nylon 610, nylon 612, and copolymers of nylon 6 / 66. And, the polyester may be at least one compound selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polytetrafluoroethylene, and copolymers thereof.

[0066]

[0067] The above-mentioned split composite fiber may be a circular or spherical fiber with a cross-section divided into 4 to 32 parts before splitting.

[0068] As shown in Fig. 1, the split composite yarn (10) has a cross-section (so-called “orange type cross-section”) formed by repeatedly forming a polyamide component (1) and a polyester component (2) in a circumferential direction with the polyamide component (1) as the boundary.

[0069] The above split composite yarn is split to form ultra-fine fibers derived from the polyamide component and ultra-fine fibers derived from the polyester component. That is, each component constituting the split composite yarn independently forms ultra-fine fibers as the split composite yarn splits.

[0070] The number of splits of the above-mentioned split composite yarn can be determined according to the fineness of the split composite yarn and the fineness of the ultrafine fibers. For example, the above-mentioned split composite yarn can be a 4-split composite yarn (A in FIG. 1), an 8-split composite yarn (B in FIG. 1), a 16-split composite yarn (C in FIG. 1), or a 32-split composite yarn (not shown) based on the number of ultrafine fibers derived from the polyester component. Although the splitting property of the above-mentioned split composite yarn tends to improve as the number of splits decreases, it is preferable to increase the number of splits in order to obtain ultrafine fibers having an appropriate level of fineness.

[0071]

[0072] According to one embodiment, the split composite yarn comprises 20 to 30 wt% of polyamide and 70 to 80 wt% of polyester. Considering the splittability of the fiber and the process efficiency, the weight ratio of the polyamide and the polyester in the split composite yarn is preferably 20:80 to 30:70. Alternatively, the volume ratio of the polyamide and the polyester in the split composite yarn may be 20:80 to 30:70. Alternatively, the area ratio of the polyamide and the polyester in the cross-section of the split composite yarn may be 20:80 to 30:70.

[0073]

[0074] The splitting fineness of the above split composite yarn is not particularly limited. However, in order to improve the efficiency of the fiber manufacturing process and the feel of artificial leather, the split composite yarn preferably has a fineness of 1.5 to 3 denier or 1.5 to 2.5 denier.

[0075] In addition, it is preferable that the ultrafine fibers formed by the splitting of the above split composite fiber have a fineness of 0.5 denier or less, or 0.1 denier to 0.5 denier, or 0.1 denier to 0.3 denier, or 0.15 denier to 0.3 denier based on the ultrafine fibers derived from the polyester component.

[0076]

[0077] The above split composite yarn can be obtained by melt spinning a first component of polyamide and a second component of polyester through a composite nozzle of a 4- to 32-split type having a so-called "orange type cross-section" to obtain an unstretched fiber bundle and then stretching the same.

[0078] The method of cutting the above-mentioned split composite yarn into single fibers and forming a nonwoven fabric by needle punching the same is not particularly limited, and can be performed under typical process conditions in the technical field to which the present invention pertains. For example, in the needle punching process, the penetration density of the needle may be 1000 to 3000 PPSC (punching per square centimeter), the stroke per minute of the needle may be 100 to 800 RPM, and the depth of the needle may be 2 to 10 mm.

[0079] The above split composite yarn may be partially split by physical impact during the needle punching process.

[0080]

[0081] Next, a step of shrinking the needle-punched nonwoven fabric to obtain a shrink fabric is performed.

[0082] The above needle-punched nonwoven fabric has an improved density due to shrinkage, and accordingly, the surface hair density of the final product, artificial leather, increases, thereby providing excellent appearance quality and a rich nap.

[0083] According to one embodiment, the step of obtaining the shrinkage cloth is performed by heat-treating the needle-punched nonwoven fabric at a temperature of 90° C. to 120° C. For example, the shrinkage cloth can be obtained by passing the needle-punched nonwoven fabric under steam or hot water for more than 1 minute.

[0084] In the step of obtaining the above shrinkage foam, some of the split composite fibers may be split due to differences in morphological stability between the polyamide and polyester.

[0085]

[0086] Next, a step of immersing the shrinkage foam in a solution containing a polymer elastomer to obtain an impregnated foam is performed.

[0087] The solution containing the polymer elastomer may include a typical polyurethane as the polymer elastomer.

[0088] The impregnated foam can be obtained by immersing the shrinkage foam in a solution containing the polymer elastomer, coagulating it in an appropriate organic solvent (e.g., N,N-dimethylformamide), and drying it.

[0089] According to one embodiment, the impregnated fabric preferably contains 15 to 35 wt%, or 20 to 35 wt%, or 20 to 30 wt% of the polymer elastomer based on the weight of the impregnated fabric. In order to secure the mechanical properties of the artificial leather, it is preferable that the impregnated fabric is provided with 15 wt% or more of the polymer elastomer. However, if the amount of the polymer elastomer provided is excessive, the feel of the artificial leather may become stiff or the nap may be reduced. Therefore, it is preferable that the impregnated fabric is provided with 35 wt% or less of the polymer elastomer.

[0090]

[0091] Next, a step is performed in which the impregnated cloth is treated with an alkaline aqueous solution to obtain an impregnated cloth in which the split composite yarn is made into ultrafine particles.

[0092] In conventional methods for manufacturing artificial leather using sea-island fibers, an extraction step is performed to remove the sea component of the sea-island fibers. However, this extraction step empties the space previously occupied by the sea component, and as a result, the island component alone is limited in its ability to produce a rich, tactile feel.

[0093] In a manufacturing method according to an embodiment of the present invention, in the step of treating the impregnated fabric with an alkaline aqueous solution, the polyamide component and polyester component forming the split composite yarn are not eluted. In the step, portions that were not divided in previous steps (e.g., the step of manufacturing a needle-punched nonwoven fabric and the shrinkage step) are divided through the treatment with the alkaline aqueous solution, and the ultrafine fibers derived from the polyamide component and the ultrafine fibers derived from the polyester component are formed, thereby completing the ultrafine formation. Accordingly, the artificial leather according to the manufacturing method can provide a rich nap and a feel with almost no fiber loss due to weight loss.

[0094]

[0095] According to one embodiment, in the step of obtaining the impregnated fabric in which the split composite fiber is micronized, the alkaline aqueous solution may be an aqueous solution containing an alkaline compound at a concentration of 0.5 to 1.5% (w / w) or 0.5 to 1.0% (w / w). For example, the micronization may be performed using an alkaline aqueous solution having a concentration of 0.5% NaOH.

[0096]

[0097] Next, a step is performed to obtain artificial leather with a nap by grinding the surface of the above-mentioned ultra-fine impregnated fabric.

[0098] The above grinding can be performed by a conventional method using sandpaper. For example, by grinding the surface of the ultra-fine impregnated fabric with sandpaper having a mesh size of #80 to #240, an artificial leather having a nap of an appropriate length can be obtained.

[0099]

[0100] If necessary, a further step of dyeing the above-mentioned leather or artificial leather may be performed.

[0101]

[0102] A manufacturing method according to an embodiment of the invention enables provision of artificial leather having rich texture and excellent mechanical properties.

[0103]

[0104] For example, the artificial leather according to the above manufacturing method has a density of 0.25 to 0.35 g / cm according to the following formula 1. 3 , or 0.26 to 0.30 g / cm 3 , or 0.27 to 0.29 g / cm 3 can represent the fiber density.

[0105] [Formula 1]

[0106] Fiber density (g / cm 3 ) = (Non-woven fabric density) X (Fiber weight ratio of artificial leather)

[0107] Density of nonwoven fabric (g / cm) 3 ) = Unit weight of nonwoven fabric (g / m) 2 ) / Non-woven fabric thickness (mm) x 1000

[0108] Fiber weight ratio of artificial leather = (Weight after extracting polymer elastomer from artificial leather) / (Weight of artificial leather)

[0109] Here, the 'weight after extraction of polymer elastomer from artificial leather' is measured by immersing artificial leather in N,N-dimethylformamide at room temperature for 12 hours or more to extract the polymer elastomer, and then washing and drying the same.

[0110]

[0111] As another example, the artificial leather obtained by the above manufacturing method may exhibit a cantilever strength of 40 to 70 mm, or 45 to 70 mm, or 45 to 65 mm, or 50 to 65 mm according to the cantilever strength test method of ASTM D5732-95.

[0112]

[0113] As another example, the artificial leather according to the above manufacturing method may exhibit a longitudinal tensile strength of 5.0 to 7.0 kgf, or 5.2 to 6.8 kgf, or 5.3 to 6.5 kgf; and a transverse tensile strength of 3.0 to 5.0 kgf, or 3.5 to 4.5 kgf, or 3.5 to 4.3 kgf.

[0114] As another example, the artificial leather according to the above manufacturing method may exhibit a longitudinal tensile elongation of 65 to 90%, or 70 to 85%, or 73 to 85%, or 73 to 80%; and a transverse tensile elongation of 100 to 125%, or 105 to 120%, or 107 to 120%, or 109 to 120%.

[0115] As another example, the artificial leather obtained by the above manufacturing method may exhibit a longitudinal tear strength of 2.5 to 5.0 kgf, or 3.0 to 5.0 kgf, or 3.0 to 4.5 kgf, or 3.5 to 4.5 kgf according to the standard test method of ASTM D2261-13 (2017); and a transverse tear strength of 2.5 to 4.5 kgf, or 3.0 to 4.5 kgf, or 3.0 to 4.0 kgf, or 3.3 to 4.0 kgf.

[0116]

[0117] Hereinafter, preferred embodiments are presented to aid understanding of the invention. However, the following examples are intended only to illustrate the invention and are not intended to limit the invention to these embodiments.

[0118]

[0119] Example 1

[0120] The first component, nylon 6, and the second component, polyethylene terephthalate, were melt-spun through an 8-split type composite nozzle to produce an 8-split type composite yarn (fineness 2.0 denier) having a cross-section as shown in Fig. 1 B and Fig. 2. At this time, the weight ratio of nylon 6 and polyethylene terephthalate was set to 20 wt%: 80 wt%.

[0121] The above-mentioned split composite yarn was crimped to a crimp count of 10 / inch, heat-set, and then cut to 51 mm. The cut composite yarn was subjected to a carding process and a cross-lapping process to form a multi-layer web. Next, the web was needle-punched at a penetration density of 2600 PPSC, a needle stroke per minute of 400 RPM, and a needle depth of 5 mm to produce a needle-punched nonwoven fabric.

[0122] The above needle-punched nonwoven fabric was passed through a steam bath at 105°C for more than 1 minute to obtain a shrinkage fabric.

[0123] The above shrinkage foam was immersed in an N,N-dimethylformamide solution containing polyurethane to obtain an impregnated foam. At this time, the impregnated foam was made to contain 25 wt% of polyurethane solids based on the weight of the impregnated foam.

[0124] The above impregnated cloth was immersed in an alkaline aqueous solution having a concentration of 0.5% (w / w) of NaOH to obtain an impregnated cloth in which the split composite yarn was completely micronized.

[0125] After drying the above impregnated fabric, its surface was ground with #150 mesh sandpaper to obtain artificial leather with a raised texture.

[0126]

[0127] Example 2

[0128] Artificial leather was manufactured in the same manner as in Example 1, except that the weight ratio of nylon 6 and polyethylene terephthalate was changed to 30 wt%:70 wt%.

[0129]

[0130] Example 3

[0131] Artificial leather was manufactured in the same manner as in Example 1, except that the above 8-split composite yarn was manufactured to have a fineness of 1.5 denier.

[0132]

[0133] Example 4

[0134] Artificial leather was manufactured in the same manner as in Example 1, except that the above 8-split composite yarn was manufactured to have a fineness of 3.0 denier.

[0135]

[0136] Example 5

[0137] Artificial leather was manufactured in the same manner as in Example 1, except that nylon 66 was used instead of nylon 6.

[0138]

[0139] Example 6

[0140] The first component, nylon 6, and the second component, polyethylene terephthalate, were melt-spun through a 16-split type composite nozzle to produce a 16-split type composite yarn (fineness 2.0 denier) having a cross-section as shown in C of Fig. 1. At this time, the weight ratio of nylon 6 and polyethylene terephthalate was set to 20 wt%:80 wt%.

[0141] Artificial leather was manufactured in the same manner as in Example 1, except that the 16-split composite yarn was used instead of the 8-split composite yarn.

[0142]

[0143] Example 7

[0144] A 32-split composite yarn (fineness of 3.0 denier) was manufactured by melt spinning the first component, nylon 6, and the second component, polyethylene terephthalate, through a 32-split type composite nozzle. At this time, the weight ratio of nylon 6 and polyethylene terephthalate was set to 20 wt%: 80 wt%.

[0145] Artificial leather was manufactured in the same manner as in Example 1, except that the 32-split composite yarn was used instead of the 8-split composite yarn.

[0146]

[0147] Comparative Example 1

[0148] Two types of alkaline-soluble polyesters were used to produce island-type fibers as shown in Fig. 3 by melt spinning through a sea-type composite nozzle. Polyethylene terephthalate was used as the island component, and co-polymerized polyester was used as the sea component. The weight ratio of the sea component and the island component was 30 wt%:70 wt%.

[0149] The above-mentioned composite fibers were crimped to a crimp count of 10 / inch, heat-set, and then cut to 51 mm. The cut composite yarns were subjected to carding and cross-lapping processes to form a multi-layer web. Next, the web was needle-punched at a penetration density of 2600 PPSC, a needle stroke per minute of 400 RPM, and a needle depth of 5 mm to produce a needle-punched nonwoven fabric.

[0150] The above needle-punched nonwoven fabric was passed through a steam bath at 105°C for more than 1 minute to obtain a shrinkage fabric.

[0151] The above shrinkage foam was immersed in an N,N-dimethylformamide solution containing polyurethane to obtain an impregnated foam. At this time, the impregnated foam was made to contain 25 wt% of polyurethane solids based on the weight of the impregnated foam.

[0152] The above impregnated cloth was immersed in an alkaline aqueous solution having a concentration of 2.5% (w / w) of NaOH to obtain an elution cloth from which the sea component of the above-described sea-island fiber was removed.

[0153] After drying the above-mentioned extract, the surface was ground with #150 mesh sandpaper to obtain artificial leather with a raised texture.

[0154]

[0155] Exam example

[0156] (1) Cross-section of fiber

[0157] The cross-section of the polyamide-polyester split composite fiber according to Example 1 and the cross-section of the island-shaped fiber according to Comparative Example 1 were observed using a scanning electron microscope, and the images are shown in FIG. 2 (Example 1) and FIG. 3 (Comparative Example 1).

[0158]

[0159] (2) Fiber density

[0160] The fiber density of artificial leather was calculated according to Equation 1 below.

[0161] [Formula 1]

[0162] Fiber density (g / cm 3 ) = (Non-woven fabric density) X (Fiber weight ratio of artificial leather)

[0163] Density of nonwoven fabric (g / cm) 3 ) = Unit weight of nonwoven fabric (g / m) 2 ) / Non-woven fabric thickness (mm) x 1000

[0164] Fiber weight ratio of artificial leather = (Weight after extracting polymer elastomer from artificial leather) / (Weight of artificial leather)

[0165] Here, the 'weight after extraction of polymer elastomer from artificial leather' is measured by immersing artificial leather in N,N-dimethylformamide at room temperature for 12 hours or more to extract the polymer elastomer (polyurethane), and then washing and drying the same.

[0166]

[0167] (3) Lectures

[0168] The stiffness (mm) of artificial leather was measured using a cantilever stiffness tester according to the standard test method of ASTM D5732-95.

[0169] A test piece measuring 25 mm in width and 200 mm in length is placed on the horizontal platform of a cantilever bending tester and pressed down with a pressure plate of the same size as the test piece, and allowed to slide at a speed of 10 mm / sec toward the inclined plane of the tester. When one end of the test piece touches the inclined plane, the position of the other end of the test piece is determined, and the distance moved (mm) is expressed as the bending strength. A higher bending strength indicates superior dimensional stability and superior elasticity properties of artificial leather.

[0170]

[0171] (4) Tensile strength and tensile elongation

[0172] Prepare a test piece measuring 50 mm in width and 250 mm in length. Place the upper part of the test piece in the clamp of a tensile testing machine (Instron), and adjust the clamp gap so that a primary load of 1.96 N (200 gf) is applied to the test piece. Pull the test piece at a rate of 200 mm / min and measure the load (kgf) and elongation (%) at break. Perform the test three times in each of the longitudinal and transverse directions of the test piece, and calculate the tensile strength and tensile elongation as the average values.

[0173]

[0174] (5) Tear strength

[0175] Prepare a test piece measuring 40 mm in width and 150 mm in length. Cut a portion of the test piece lengthwise or widthwise according to the standard test method of ASTM D2261-13 (2017), and attach the cut left and right sides to the upper and lower clamps of the tear strength measuring device. Spread the clamps at a speed of 200 mm / min to measure the maximum load (kgf) at which the test piece ruptures. Perform the test three times in each of the lengthwise and widthwise directions of the test piece, and calculate the tear strength as the average value.

[0176]

[0177] Example 1 Example 2 Example 3 Example 4 Fiber density (g / cm 3 )0.2800.2770.2820.276Tensile strength (mm)61555663Tensile strength (kgf)Length direction5.95.56.35.5Width direction4.13.84.33.7Tensile elongation (%)Length direction75807377Width direction110116112118Tear strength (kgf)Length direction3.94.13.84.0Width direction3.43.63.33.5

[0178] Example 5 Example 6 Example 7 Comparative Example 1 Fiber density (g / cm 3 )0.2790.2850.2870.198Temperature (mm)62505132Tensile strength (kgf)Length direction6.15.95.93.6Width direction4.24.24.22.7Tensile elongation (%)Length direction74787965Width direction10911211595Tear strength (kgf)Length direction4.03.83.92.5Width direction3.63.53.62.1

[0179]

[0180] Referring to Tables 1 and 2 above, it was confirmed that the artificial leather according to the examples has a significantly higher fiber density than the artificial leather of Comparative Example 1, and thus has a rich nap while also having excellent dimensional stability and mechanical properties.

[0181]

[0182] Although the present invention has been described above through limited embodiments, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

Claims

1. A step of manufacturing a needle-punched nonwoven fabric using a polyamide-polyester split composite yarn; A step of shrinking the above needle-punched nonwoven fabric to obtain a shrinkage fabric; A step of immersing the shrinkage foam in a solution containing a polymer elastomer to obtain an impregnated foam; A step of treating the above impregnated cloth with an alkaline aqueous solution to obtain an impregnated cloth in which the split composite yarn is made into ultrafine particles; and Step of grinding the surface of the above-mentioned ultrafine impregnated cloth to obtain artificial leather with a raised texture A method for manufacturing artificial leather, comprising:

2. In paragraph 1, A method for manufacturing artificial leather, wherein the polyamide-polyester split composite yarn is a 4-split composite yarn, an 8-split composite yarn, a 16-split composite yarn, or a 32-split composite yarn.

3. In paragraph 1, A method for producing artificial leather, wherein the polyamide-polyester split composite yarn contains 20 to 30 wt% of polyamide and 70 to 80 wt% of polyester.

4. In paragraph 1, A method for manufacturing artificial leather, wherein the polyamide-polyester split composite yarn has a fineness of 1.5 denier to 3 denier.

5. In paragraph 1, A method for manufacturing artificial leather, wherein the step of obtaining the above shrinkage foam is performed by heat treating the needle-punched nonwoven fabric at a temperature of 90° C. to 120° C.

6. In paragraph 1, A method for manufacturing artificial leather, wherein the impregnated fabric contains 15 to 35 wt% of the polymer elastomer based on the weight of the impregnated fabric.

7. In paragraph 1, A method for manufacturing artificial leather, wherein the above alkaline aqueous solution is an aqueous solution containing an alkaline compound at a concentration of 0.5 to 1.5% (w / w).

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