KR20090056513A - Artificial leather and method of manufacturing the same - Google Patents

Abstract

Artificial leather and a manufacturing method thereof are provided to offer improved appearance and color development with excellent light fastness by preventing discharge of dyes to the outside of a product. Artificial leather has an elastomer in which ultrafine fibers of which single fastness is 0.001~0.3 denier, are interwoven. The artificial leather includes one kind or more of blue dyes, one kind or more of yellow dyes, and one kind or more of red dyes. The light fastness of the leather is 4 grade or more and lightness is 15 or less. The elastomer is one selected from polyurethane resin and polyurea resin. The blue dye is one or more selected from CI Disperse Blue 56 and CI Disperse Blue 60.

Description

Artificial leather and method of manufacturing the same

The present invention relates to a vehicle artificial leather and a manufacturing method thereof having excellent light fastness, more specifically, excellent color fastness to prevent the dye from being discharged out of the surface of the product during use, greatly improving the color development and appearance, The present invention relates to a vehicle artificial leather and a method of manufacturing the same, which can prevent a problem of contaminating clothes of a passenger.

Artificial leather is composed of a nonwoven fabric in which microfibers are intertwined three-dimensionally and a polymer elastomer impregnated in the nonwoven fabric. The artificial leather has excellent feel, light effect and drape, and has a soft texture and unique appearance similar to that of natural leather. BACKGROUND ART It is widely used as a sheet skin material or interior material of a vehicle (hereinafter, referred to as "vehicle") for transportation such as trains and ships.

In addition, recently, the artificial leather material is recognized as a highly sensitive material, and the application to the vehicle is increasing day by day, and aesthetic elements such as a soft lighting effect are becoming very important.

Artificial leather (abbreviated as "vehicle artificial leather"), which is used as a vehicle material, requires durability and form stability against friction and external forces, and can be transferred to dyed dyes and surfaces to prevent contamination of passengers' clothes. To ensure good light fastness.

In particular, vehicle artificial leather is required to be more excellent light fastness because the time to be exposed to daylight increases.

Artificial leather is typically a structure composed of a nonwoven fabric made of microfiber and a polymer elastomer impregnated in the nonwoven fabric.

When the artificial leather is dyed with dye, dye particles penetrate into each of the microfiber and the polymer elastomer to express color.

However, the dye particles penetrated into the microfiber do not escape well to the surface of the product even when exposed to sunlight, but the dye particles penetrating into the polymer elastomer having a porous structure easily escape to the surface of the product when exposed to sunlight, resulting in deterioration of color and appearance. There was a problem such as contaminating the clothes of the occupants.

In order to solve the conventional problems as described above, as a conventional technique for imparting light fastness to artificial leather, Korean Patent Laid-Open Publication No. 2005-0084795 and Korean Patent Laid-Open Publication No. 2004-0029264 include polymer elastomers and / or ultrafine fibers that constitute artificial leather. Although the original method of adding carbon black or an organic pigment in the fiber is disclosed, the conventional methods have a problem in that the color can not be varied because it adopts an original method rather than dyeing, although it improves light fastness.

An object of the present invention is to provide a vehicle artificial leather that can solve all of the above conventional problems.

The present invention is to provide a vehicle artificial leather that is excellent in light fastness to prevent the dye is discharged out of the surface of the product during use, greatly improving the color development and appearance, and also prevents the problem of contamination of the clothes of the passengers due to dye transfer. .

In addition, the present invention is to provide a method for manufacturing the vehicle artificial leather.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

First, the artificial leather for vehicles according to the present invention is an artificial leather impregnated with a polymer elastomer in a nonwoven fabric in which microfibers having a single yarn fineness of 0.001 to 0.3 denier are intertwined with each other, one or more blue dyes and one or more yellow dyes. And one or more types of red dyes, each having a light fastness of 4 or more, and having a lightness of 15 or less.

In addition, the vehicle artificial leather according to the present invention, including the one or more blue-based dyes, one or more yellow-based dyes, and one or more red-based dyes, the light fastness measured by the method described below is a grade 4 or more, Lightness) is 15 or less.

The artificial leather mentioned above is a structure in which a polyurethane resin is impregnated between polyester microfibers. Therefore, it is very important to control the dyeability of polyester microfiber and polyurethane resin for dyeing artificial leather having high fastness. If there are a lot of dyes in the polyurethane resin part after completion of dyeing process, due to the low glass transition temperature of polyurethane resin, 'bleeding' phenomenon is produced in which disperse dyes, which are crystalline after dyeing, are discharged to the surface of fiber. Since the problem of deterioration arises, the selection of the dye which does not have the said problem is important.

The blue dye includes one or more selected from CI Disperse Blue 56 and CI Disperse Blue 60.

The red dye includes one or more selected from CI Disperse Red 82, CI Disperse Red 167, and CI Disperse Red 167: 1.

The yellow dye comprises CI Disperse Yellow 64.

The CI mentioned here stands for Color Index, a salt / pigment guide created by relevant chemists from the Society of Dyers and Colurists in the UK and the American Association of Textile Chemists and Colorists in the United States. The salt / pigment name, application, chemical structure and main suppliers are mentioned here. For example, if it starts with CIDisperse, it means a disperse dye listed in the color index, and if it starts with CI acid, the color index ( Acid dyes listed in the Color Index.

The particle size of the dye constituting the dye combination is preferably 0.7 to 1.0 mu m.

If the particle size of the dye is less than 0.7 µm, light fastness is poor. If the particle size exceeds 1.0 µm, dye penetration into the fiber is difficult, resulting in uneven cracking and dye fastness.

The polymer elastomer is a polyurethane resin, a polyurea resin, or the like, and a polyurethane resin is most preferable in view of workability.

The ultrafine fibers are polyamide fibers, polyester fibers, and the like, but the present invention does not specifically limit the kind of ultrafine fibers.

Single yarn fineness of the ultrafine fibers is 0.001 ~ 0.3 denier.

If the single yarn fineness is less than 0.001 denier, the strength of the artificial leather is lowered. If the single yarn fineness is more than 0.3 denier, the touch and lighting effect of the artificial leather is lowered.

In the present invention, various physical properties of artificial leather for vehicles are evaluated by the following method.

Light fastness Daylight fastness )

A 340 nm light source is irradiated to a sample with the light quantity of 0.55 W / m <2> by SAE J 1885 method, and it measures.

Lightness

Measured using a CCM (Computer Color Matching) device. Specifically, after irradiating light of 380 ~ 780 ㎚ to the sample to collect and amplify the reflected light to obtain a blackness (Lightness).

A blackness of 0 represents black and 100 represents white.

In the manufacturing method of artificial leather for vehicles having excellent light resistance according to the present invention, a polymer elastic body is impregnated in a nonwoven fabric in which microfibers having a single yarn fineness of 0.001 to 0.3 denier are entangled with each other, and the microfine fibers are formed on the surface of the wool. It is characterized in that the artificial leather having a structure is dyed with a dye combination comprising at least one blue dye, at least one yellow dye and at least one red dye.

The content of the blue dye, the yellow dye and the red dye in the dye combination is preferably 1 to 35% by weight.

Next, an example of a method of manufacturing the vehicle artificial leather according to the present invention will be described in detail.

First, in the present invention, the island-in-the-sea composite fiber composed of sea component which is an alkali-soluble copolyester and island components having a single yarn fineness of 0.001 to 0.3 denier is dispersed in the sea component, and then opened, carded, cross-wrapped and Needle punching produces a nonwoven fabric.

Next, the composite sheet impregnated with the polymer elastic body in the nonwoven fabric and then treated with an aqueous alkali solution to elute the sea component to the composite sheet impregnated with the polymer elastic body in the nonwoven fabric intertwined microfibers having a single yarn fineness of 0.001 ~ 0.3 denier Manufacture.

Meanwhile, in the present invention, the nonwoven fabric prepared as described above may be first treated with an aqueous alkali solution to elute the sea component, and then impregnated with the polymer elastomer.

Alkali-soluble copolyester which is the above-mentioned sea component has polyethylene terephthalate as a main component, and as an additional component, molecular weight 400-20000, most preferably 1000-4000 polyethylene glycol, polypropylene glycol, 1,4-cyclohexanedicar Acids, 1,4-cyclohexanedimethanol, 1,4-cyclohexanedicarboxylate, 2,2-dimethyl-1,3-propanediol, 2,2-dimethyl-1,4-butanediol, 2, 2,4-trimethyl 1,3-propanediol and copolyester obtained by copolymerizing 25% by weight or less of one or two or more selected from adipic acid.

Polyurethane resins, polyurea resins, polyacrylic acid resins, and the like may be used as the polymer elastomer, but polyurethane resins are preferable in terms of processed tablets, abrasion resistance, and hydrolysis resistance.

The weight ratio of the fibrous base composed of the polymer elastomer / fine fiber is preferably 10/90 to 70/30.

When the weight ratio of the polymer elastomer is less than 10% by weight, the cushioning property is too low, and when it exceeds 70% by weight, the feel and light effect are too low.

The method of filling the polymer elastomer may be applied by wet coagulation or dry coagulation after impregnating and / or applying the organic solvent solution or the aqueous dispersion of the polymer elastomer to the nonwoven fabric.

As an organic solvent of a high molecular elastic body, toluene, acetone, methyl ethyl ketone, etc. other than polar solvents, such as dimethylformamide, dimethylacetamide, and dimethyl sulfoxide, can be used.

Next, a composite sheet prepared as described above and impregnated with a polymer elastic body impregnated into the microfiber nonwoven fabric, and into a dye combination comprising at least one blue dye, at least one yellow dye, and at least one red dye. It is dyed to manufacture artificial leather for vehicles.

Vehicle artificial leather of the present invention described above has excellent light fastness to prevent the dye from being discharged out of the surface of the product during use, greatly improving the color development and appearance, and can also prevent the problem of contamination of the occupant's clothes due to dye transfer. .

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

However, the present invention is not limited by the following examples.

Example  One

The island-in-the-sea composite fiber (single-fiber fineness: 0.05 denier of the island component) composed of the sea component of the alkali-soluble copolyester and 70 island components of the polyester resin dispersed and dispersed in the sea component is cut to a length of 50 mm to form short fibers. After the lamination web of the islands-in-the-sea composite short fibers was manufactured through a carding and cross wrapper process, needle punching was performed to prepare a nonwoven fabric of the islands-in-sea composite fiber.

Next, the prepared nonwoven fabric was impregnated with 40% by weight of polyurethane resin to the nonwoven fabric, and then wet-coagulated, and then dissolved in seawater components in the island-in-the-sea composite fiber by treating with an aqueous alkali solution (caustic soda solution). Prepared.

Next, the composite sheet was buffed using a brush, followed by (i) 30% by weight of a blue dispersion dye composed of CI Disperse Blue 56 and CI Disperse Blue 60, and (ii) CI Disperse Red 82, Vehicle artificial by dyeing with 35% by weight of red disperse dye consisting of CI Disperse Red 167 and CI Disperse Red 167: 1 and 35% by weight of yellow disperse dye with CI Disperse Yellow 64 Leather was manufactured.

The particle size of each of the blue dispersion dye, the red dispersion dye, and the yellow dispersion dye is 0.8 μm.

The results of evaluating various physical properties of the manufactured artificial leather for cars are shown in Table 1.

Comparative Example  One

Vehicle artificial leather was prepared in the same manner as in Example 1 except that the buffed composite sheet of Example 1 was dyed only with CI Disperse Blue 56.

The results of evaluating various physical properties of the manufactured vehicle artificial leather are shown in Table 1.

Comparative Example  2

A vehicle artificial leather was manufactured in the same manner as in Example 1, except that the buffed composite sheet of Example 1 was dyed only with CI Disperse Red 82.

The results of evaluating various physical properties of the manufactured vehicle artificial leather are shown in Table 1.

Comparative Example  3

Vehicle artificial leather was prepared in the same manner as in Example 1, except that the buffed composite sheet of Example 1 was dyed only with CI Disperse Yellow 64.

The results of evaluating various physical properties of the manufactured vehicle artificial leather are shown in Table 1.

division Light fastness (class) Blackdo Example 1 Grade 5 12 Comparative Example 1 Level 3 30 Comparative Example 2 Level 3 28 Comparative Example 3 Level 3 32

The present invention has excellent light fastness to prevent the dye from being discharged out of the surface of the product during use, greatly improving the color development and appearance, it is also possible to prevent the problem of contamination of the clothes of the occupant due to the dye transfer.

Claims (8)

In an artificial leather in which a polymer elastic body is impregnated in a nonwoven fabric in which microfibers having a single yarn fineness of 0.001 to 0.3 denier are interwoven with each other, the artificial leather includes at least one blue dye, at least one yellow dye, and at least one red dye. , Light fastness of more than 4 grades, artificial leather, characterized in that the lightness (lightness) is 15 or less. The artificial leather according to claim 1, wherein the polymer elastomer is one selected from a polyurethane resin and a polyurea resin. The artificial leather of claim 1, wherein the blue dye comprises at least one selected from CI Disperse Blue 56 and CI Disperse Blue 60. The method of claim 1, wherein the red dye comprises at least one selected from CI Disperse Red 82, CI Disperse Red 167 and CI Disperse Red 167: 1. Artificial leather characterized in that. The artificial leather of claim 1, wherein the yellow dye comprises CI Disperse Yellow 64. The artificial leather according to claim 1, wherein the particle size of the dye constituting the dye combination is 0.7 to 1.0 mu m. 1 or more kinds of artificial leather having a structure in which a microelastic fiber having a single yarn fineness of 0.001 to 0.3 denier is impregnated with a polymer elastic body in the interwoven nonwoven fabric, and the microfine fibers are formed on the surface to form wool. , Dyeing method of artificial leather, characterized in that dyed with a dye combination comprising at least one yellow dye and at least one red dye. The method of manufacturing artificial leather according to claim 7, wherein the content of the blue dye, the yellow dye and the red dye in the dye combination is 1 to 35% by weight.