KR20170111892A - artificial leather with improved appreance and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an artificial leather improved in appearance quality, which comprises a bristles formed on a microfibrous nonwoven fabric using a sea chart and dyed and post-processed, wherein a second bristle is formed by using a fabric sandpaper A method for producing artificial leather is provided.
According to the present invention, by using the fabric sandpaper in the process of forming bristles during the production of artificial leather, the length of the bristle becomes longer, the nap density is increased, and the uniformity of the brushed is improved. Therefore, the surface of the artificial leather becomes smooth, Appearance appears.
In addition, since the polyurethane layer, which is an elastic body of the artificial leather, is covered by the bristles thus formed, the occurrence of the non-penetration of polyurethane is suppressed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an artificial leather having improved appearance quality,

The present invention relates to an artificial leather in which bristles are formed in a post-processing step in the production of artificial leather, and the appearance quality is improved by controlling the length and density of the bristles.

In general, a method for producing a nonwoven fabric artificial leather is characterized in that a nonwoven fabric is formed through a nonwoven fabric manufacturing process such as needle punching using a sea chart yarn, a polymeric elastomer is added to the nonwoven fabric and the sea component of the nonwoven sea shell is eluted using an appropriate solvent After which a bristle is formed on the surface, and artificial leather is produced through post-processing for imparting dyeing and functionality to a desired color.

Generally, bristles are developed in a buffing process by using a gold-studded sandpaper such as aluminum oxide, ceramics, or silicon carbide when bristles are formed, but the bristles have a short length and a low nap density, .

In order to overcome this difficulty, some improvements were made by changing the buffing conditions such as the number of sandpaper, the sanding roll speed, and the sanding time. However, there are still limitations in expressing excellent appearance quality.

The artificial leather has a beautiful and luxurious appearance, and it is continuously required to improve its appearance with important physical properties.

Korean Patent No. 0367926 (Title of the Invention: Method of Manufacturing Suede Artificial Leather for Shoes)

The present invention has been made in view of the above-mentioned needs, and an object of the present invention is to provide an artificial leather improved in brass forming method and improved in appearance quality.

In order to solve the above-described problems, the present invention provides a method for producing a sea-island staple fiber, comprising the steps of: Preparing a nonwoven fabric using the sea-island short fibers; Treating the nonwoven fabric with a caustic soda aqueous solution to elute the sea component of the sea-island staple fiber to obtain an eluted foam; Impregnating the eluting foil with a polyurethane elastomer to obtain an elastomer impregnated nonwoven fabric; Impregnating the surface of the elastic-impregnated nonwoven fabric with buffing using sandpaper to obtain a woven fabric having a brushed surface; Dyeing the brushed nonwoven fabric to obtain a dyed nonwoven fabric; And buffing the dyed nonwoven fabric with a fabric sandpaper to form a secondary brushed shape. The present invention also provides a method of manufacturing an artificial leather having improved appearance quality.

According to the present invention, by using the fabric sandpaper during brassiere formation in manufacturing artificial leather, the bristle length becomes long, the nap density increases, and the uniformity of the brushed is improved, so that the surface of the artificial leather becomes smooth, Appearance appears.

In addition, since the polyurethane layer, which is an elastic body of the artificial leather, is covered by the bristles thus formed, the occurrence of the non-penetration of polyurethane is suppressed.

The present invention relates to a nonwoven fabric, which comprises a nonwoven fabric formed by using sea chart yarn, a polymer elastomer being imparted to the nonwoven fabric and a sea component of marine sea leaf of the nonwoven fabric being eluted using a solvent, And then post-processing to impart dyeability and functionality to the nonwoven fabric, characterized in that bristles are formed and the bristles are secondarily brushed again using a fabric sandpaper in the post-processing step .

In this case, the fabric sandpaper is not attached to an abrasive such as a gold steeckle, a sand, etc., but is attached with a fabric, and the fabric may be a cotton, a polyester, a blend of cotton and polyester, Do.

In addition, the fabric of the fabric is twill, the yarn count is 15 to 66 tex for both warp and weft, and the density is preferably 33 to 87 dt / inch for both warp and weft.

The twill twill is a fabric structure in which the intersecting tissue points exhibit a diagonal ridge line. The bristles can be formed by such a tissue point, and the breakage of the bristles can be prevented unlike the case of using the sandpaper with the abrasive material using the gold wire.

If the number is too high, the uniformity of the surface bristles tends to decrease because the fiber fineness increases and the number of the tissue points per area decreases. When the number is too low, the density decreases simultaneously, Can not.

The surface of the artificial leather after dyeing was washed with the fabric sandpaper in an endless type buffing machine and the rotation speed of the sanding roll was 600 to 1000 RPM and the line speed was 2 To 5 m / min.

Since the bristles formed in the first bristle, which is not the concept of the surface grinding, are more uniformly arranged by the tissue point of the fabric sandpaper by the above-mentioned second bristle, The surface smoothness index MIU of the surface is 0.1 to 0.3 탆 (KES SE-SR system, piano wire 50 g load), bristle uniformity index SMD 1.0 to 3.0 탆 (KES SE-SR system, piano wire 50 g load) An artificial leather improved in appearance quality can be produced.

Hereinafter, the present invention will be described in more detail with reference to the following examples and comparative examples.

It is to be understood, however, that the invention is not to be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Will be apparent to those skilled in the art to which the present invention pertains.

[Example 1]

1) Manufacture of sea-island short fibers

Polyester copolymerized with polyethylene terephthalate as a conductive component and 5 mol% of a polyester copolymer containing a metal sulfonate as a sea component was prepared and composite yarn was dispersed so as to have a weight ratio of the isotopic component to a marine component of 70:30 Sea-island filaments were obtained.

Then, the sea-island filament was stretched, crimped and heat-set, and then cut to 51 mm to prepare a sea-island staple fiber.

2) Production of nonwoven fabric

The nonwoven fabric having a weight per unit area of 500 g / m < 2 > was produced by forming a multi-layered web through the carding step and the cross lapping step and then needle punching.

3) Manufacture of eluate

Then, the nonwoven fabric was treated with an aqueous solution of caustic soda having a concentration of 5% by weight to prepare an eluting blanket for forming polyethylene terephthalate ultrafine nonwoven fabric as a component through an elution process of eluting the copolymerized polyester as a sea component.

4) Manufacture of artificial leather

The eluate was immersed in a polyurethane elastic elastomer solution at a concentration of 15% by weight and obtained by dissolving polyurethane in a solvent of dimethylformamide (DMF) at 25 ° C, and the polyurethane was solidified in a 25% by weight aqueous solution of dimethylformamide , Followed by water washing with water to prepare a polyurethane-impregnated nonwoven fabric.

Thereafter, the polyurethane-impregnated nonwoven fabric was subjected to thermal calendering using a roll heated to 130 ° C., and the surface of the nonwoven fabric impregnated with polyurethane was buffed using roughness # 150 sandpaper to form brushed , And dyed in a high-pressure rapid dyeing machine using a disperse dye, followed by washing and drying.

5) Post processing

As the twill weave fabric, the number of yarns was 48 tex and the density was 59 dt / inch in both warp and weft. The sanding roll was rotated at 800 RPM and the line speed was 4 m / min. Brushed and finally, artificial leather was produced.

[Examples 2 to 5]

An artificial leather was produced in the same manner as in Example 1, except that the conditions were changed to the conditions shown in Table 1 below.

[Comparative Examples 1 to 5]

In Example 1, artificial leather was produced in the same manner as in Example 1, except that the conditions were changed to the conditions shown in Table 2 below.

The following test methods were used for the artificial leather produced in the above Examples and Comparative Examples, and the test results are shown in Tables 1 and 2 below.

<Test Method>

1. The smoothness index (MIU) and the uniformity index (SMD)

Using a sheet surface property measuring device (KES SE-SR system, Kato Tech Co., Ltd., Japan) The surface of the artificial leather is scraped along the direction of the brushed with a load of 50 g and a speed of 1 mm / sec using a piano string to measure the force and the vertical movement of the piano string to measure smoothness and uniformity of the surface.

The smoothness is expressed by the average coefficient of friction (MIU), and the uniformity is expressed by the surface roughness (SMD). The units are all 탆. The smoothness of the surface and the higher the uniformity of the bristles, Low smoothness index (MIU) and uniformity index (SMD).

Example 1 Example 2 Example 3 Example 4 Example 5 Sandpaper material Cotton fabrics Cotton fabrics Cotton fabrics Cotton fabrics Cotton fabrics Number (tex) 48 59 15 48 48 Density (dt / inch) 59 84 33 59 59 Buffing condition Sanding roll rotation speed (RPM) 800 800 800 600 1,000 Line speed (m / min) 4 4 4 3 5 MIU (占 퐉) 0.242 0.258 0.293 0.273 0.291 SMD (탆) 2.54 2.88 2.91 2.71 2.88

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Sandpaper material Second brushed Aluminum oxide ceramic Cotton fabrics Cotton fabrics Number (tex) - - - 48 10 Density (dt / inch) - - - 59 25 Buffing condition Sanding roll rotation speed (RPM) - 800 800 1,200 800 Line speed (m / min) - 4 4 2 4 MIU (占 퐉) 0.431 0.450 0.512 0.483 0.410 SMD (탆) 3.49 3.75 4.13 3.90 3.36

From the above Tables 1 and 2, it can be seen that the surface of the artificial leather subjected to the second brushed with the cotton fabric according to the present invention is much reduced in MIU and SMD compared to the case where the second brushed or other sandpaper is used, .

Also, even though the cotton fabric sandpaper is used, it can be confirmed that the degree of improvement in smoothness and uniformity is insignificant when it is out of the conditions according to the present invention.

Claims (6)

Obtaining a short staple fiber by coextruding sea-island fibers, stretching and cutting them;
Preparing a nonwoven fabric using the sea-island short fibers;
Treating the nonwoven fabric with a caustic soda aqueous solution to elute the sea component of the sea-island staple fiber to obtain an eluted foam;
Impregnating the eluting foil with a polyurethane elastomer to obtain an elastomer impregnated nonwoven fabric;
Impregnating the surface of the elastic-impregnated nonwoven fabric with buffing using sandpaper to obtain a woven fabric having a brushed surface;
Dyeing the brushed nonwoven fabric to obtain a dyed nonwoven fabric; And
And forming a second bristle by buffing the dyed nonwoven fabric using a fabric sandpaper. The method according to claim 1,
Wherein the fabric sandpaper is a fabric to which a fabric is attached, and the material of the fabric is selected from cotton, polyester, and a synthetic fiber of cotton and polyester. 3. The method of claim 2,
Wherein the texture of the fabric is twilled. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt; 3. The method of claim 2,
Wherein the fiber count in the fabric is 15 to 66 tex for both warp and weft yarns and the density is 33 to 84 dt / inch for both warp and weft yarns. The method according to claim 1,
The step of forming the second bristles may be performed under the condition that the rotating speed of the sanding roll is 600 to 1000 RPM in the buffing machine and the moving speed is 2 to 5 m / min The method of manufacturing an artificial leather according to claim 1, A method for producing a golf ball having a surface smoothness index MIU of 0.1 to 0.3 占 퐉 (a KES SE-SR system, a piano streak of 50 g load) and a bristle uniformity index SMD of 1.0 to 3.0 占 퐉 (KES SE-SR system, 50g load of piano wire).