KR101401166B1 - Artificial leather - Google Patents

Abstract

TECHNICAL FIELD The present invention relates to an artificial leather which can be used in a field where a high degree of cleanliness is required or a washing and polishing field which does not allow nano-scale fine scratches, by controlling the content of inorganic particles to 200 ppm or less in the production of artificial leather . The artificial leather of the present invention is a nonwoven fabric made of microfine fibers of 0.1 denier or less; And an elastic polymer resin impregnated in the nonwoven fabric, wherein the content of the inorganic particles as a whole is 200 ppm or less.

Description

Artificial leather {

The present invention relates to an artificial leather, and more particularly to an artificial leather made of microfine fibers.

Conventional artificial leather comprises a nonwoven fabric made of fibers and a polymer elastic body impregnated in the nonwoven fabric.

The fibers constituting such artificial leather include inorganic particles such as titanium dioxide for smooth production.

However, such inorganic particles are liable to be detached and thus can not be utilized in fields requiring a high degree of cleanliness. In addition, since such inorganic particles have a high hardness, there is a problem that they can not be utilized in the precision cleaning and polishing fields which do not permit fine scratches at the nano level.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an artificial leather- The present invention provides an artificial leather which can be used for an artificial leather.

In order to accomplish the above object, the present invention provides a nonwoven fabric comprising: a nonwoven fabric made of ultrafine fibers of 0.1 denier or less; And an elastic polymer resin impregnated in the nonwoven fabric, wherein the content of the inorganic particles as a whole is 200 ppm or less.

The present invention has the following effects.

Since the artificial leather according to the present invention can remarkably improve the occurrence of pollution and micro-scratches by controlling the inorganic particles to 200 ppm or less, it is possible to prevent the environment where highly cleanliness is required or even nano- It is applicable to surface processing field.

Accordingly, the artificial leather can be effectively used in the field of cleaning or polishing surfaces of silicon, glass, crystal material, metal, and the like.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Therefore, the present invention encompasses all changes and modifications that come within the scope of the invention as defined in the appended claims and equivalents thereof.

Hereinafter, the artificial leather according to one embodiment of the present invention will be described in detail.

The artificial leather of the present invention includes a nonwoven fabric made of ultrafine fibers of 0.1 denier or less.

The nonwoven fabric may be produced through the following process.

First, sea-island type fibers are produced through a composite spinning process. The component in the sea-island type fibers may be a polyamide or polyester, and the polyester may be polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) or polybutylene terephthalate (PBT). Particularly, since the polyamide has a low modulus of elasticity, it can be effectively used in fields requiring excellent cleaning and polishing properties.

Next, the sea-island fibers are formed into a short fiber shape such as staple fibers through a cutting process. The sea-island fibers in the form of short fibers are subjected to a carding process and a cross lapping process to form a web. Alternatively, a web may be formed directly by a spun bonding process using a sea-island fiber in the form of a long fiber without a cutting process.

The plurality of webs thus formed are bonded to each other by using a needle punch or a water jet punch to complete the nonwoven fabric.

The artificial leather of the present invention includes an elastic polymer resin impregnated in the nonwoven fabric.

The process of impregnating the nonwoven fabric with the elastic polymer resin can be carried out as follows.

The process of impregnating the nonwoven fabric with the elastic polymer resin can be performed by a coating process or a dipping process. Among them, a simple and easy dipping process will be described in detail as follows.

First, the elastic polymer resin may be a polyurethane resin or a silicone resin. The polyurethane resin may be a polycarbonate diol resin, a polyester diol resin or a polyether diol resin alone, or a combination thereof.

The step of immersing the nonwoven fabric in the composition including the elastic polymer resin, the coagulation step of solidifying the elastic polymer resin in the coagulation bath, and the step of washing in the water bath are sequentially performed to complete the impregnation process of the elastic polymer resin . The coagulating solution contained in the coagulation bath may be a mixed solution containing water and dimethylformamide.

Subsequently, microfabricated processes for removing marine components in the sea-island fibers are sequentially performed to complete the artificial leather. Alternatively, the microfabrication process may be performed first, followed by the impregnation process of the elastic polymer resin.

More specifically explaining the microfabrication process, an alkali solution such as a caustic soda aqueous solution is used to elute and remove the above-mentioned sea component from the conjugate fiber composed of a cast component and a sea component. By removing the sea component, the residual islands become microfine fibers. The microfine fibers produced by the microfine process may have a fineness range of 0.1 denier or less in terms of tactile and cleaning effects.

Although the method of producing artificial leather using sea-island fibers has been described above, the present invention is not limited to this. The microfibers are prepared from the beginning, and the nonwoven fabric is manufactured using the microfibers, Impregnation can also be used to produce artificial leather.

The artificial leather thus produced includes an inorganic particle content of not more than 200 ppm as a whole.

Generally, when fibers constituting the nonwoven fabric for artificial leather are produced, inorganic particles such as titanium dioxide of several thousand ppm are added in order to smoothly proceed the production process of the fibers. However, when such an inorganic particle is used for surface processing of an electronic substrate or the like, the inorganic particles are detached on the surface to contaminate the substrate, and a fine scratch is formed on the surface as having a high hardness.

Such artificial leather containing thousands of ppm of inorganic particles can not be used in a field where a high degree of cleanliness is required because inorganic particles can be dropped, and also in a cleaning and polishing field where nanoscale contamination and fine scratches are not allowed It may be difficult to use it.

Accordingly, the artificial leather of the present invention includes an inorganic particle content of not more than 200 ppm as a whole, so that contamination and fine scratches are not generated.

The inorganic particles may have a Mohs hardness of from 6 to 9. The inorganic particles having such high hardness in the above range cause many microstreaks on the surface of the object to be cleaned and polished.

As the inorganic particles added to the fiber production, various materials can be used to improve the processability of the fiber and improve the functionality such as extinction. Particularly, titanium dioxide is an inorganic particle used for producing polyamide or polyester fiber to be. However, the titanium dioxide is incomplete in interfacial fusion so that it can be easily removed from the fiber, thereby causing contamination and having high hardness, so that fine scratches are easily generated. Accordingly, the artificial leather may preferably contain titanium dioxide of 200 ppm or less.

Using the artificial leather as described above, the glass disk was processed for 30 seconds at a pressure of 1 kg / cm 2 and a rotation speed of 800 rpm by using an EDC-1800 processing machine, and then cleaned and dried, and measured using a Nanoscope IIIa AFM manufactured by Veeco The surface roughness of an artificial leather is in the range of 0.1 to 0.7. As described above, the artificial leather has excellent scratch resistance and can be used in fields where nano-scale fine scratches are not allowed.

Hereinafter, embodiments and comparative examples of the present invention will be described in detail. The present invention is to be understood only by the following examples and is not intended to limit the scope of protection of the claims.

Example  One

5 mol% of a polyester unit containing a metal sulfonate is copolymerized with polyethylene terephthalate as a main component and a copolymer polyester not containing titanium dioxide as an inorganic particle is melted to prepare a melt of a sea component, A nylon 6 resin not containing titanium is melted to prepare a melt of an island component. Thereafter, the filament was spin-cast using 50 wt% of the melt of the sea component and 50 wt% of the molten liquid of the lead component to obtain filaments having a single filament fineness of 3 denier and 91 filaments in cross section, and the filament was drawn at a draw ratio of 3.5 And then drawn to produce a filament type sea-island fiber. Thereafter, a crimp process was carried out using the sea-island fibers to have a crimp number of 15 / inch, and the fiber was heat-set at 130 ° C and cut into 50 mm to prepare staple-shaped sea-island fibers.

Thereafter, the web was formed through a carding process and a cross lapping process of the staple-shaped sea-island fibers, and then the webs were subjected to a needle punching process to produce a nonwoven fabric.

Thereafter, the nonwoven fabric was treated with a caustic soda aqueous solution having a concentration of 5 wt% to elute the marine components in the composite fibers, followed by drying at a temperature of 80 ° C to obtain a microfiber artificial leather.

Thereafter, the microfabricated nonwoven fabric was padded with a 5 wt% aqueous solution of polyvinyl alcohol, dried, and the dried nonwoven fabric was immersed in a dimethylformamide (DMF) solvent at a concentration of 10 wt% Of polyurethane solution for 3 minutes. Thereafter, the nonwoven fabric immersed in the polyurethane solution was coagulated in an aqueous solution of dimethylformamide having a concentration of 15% by weight, and was washed with water to obtain a polyurethane-impregnated nonwoven fabric.

Thereafter, a buffing process was performed to produce nap on the surface of the polyurethane-impregnated nonwoven fabric to obtain artificial leather.

Example  2

In Example 1 described above, artificial leather was obtained in the same manner as in Example 1, except that the total amount of titanium dioxide was 200 ppm in the nylon 6 resin as the metallic component and the copolymer polyester as the metallic component.

Comparative Example  One

In Example 1 described above, artificial leather was obtained in the same manner as in Example 1, except that the total amount of titanium dioxide was 3000 ppm in the nylon 6 resin as the metallic component and the copolymer polyester as the metallic component.

Comparative Example  2

In Example 1 described above, artificial leather was obtained in the same manner as in Example 1 except that a total of 300 ppm was added to the nylon 6 resin as the metallic component and the copolymer polyester as the sea component.

The physical properties of the artificial leathers produced by the examples and comparative examples were measured by the following methods and are shown in Table 1 below.

Content of Titanium Elements ( ppm )

The content of the titanium element, which is an inorganic particle contained in the artificial leather, is measured by using an ICP apparatus after collecting a sample of about 0.5 g, pretreating the sample by using a carbonization method.

Process cleanliness

The glass cloth was processed by EDC-1800 processing machine at a pressure of 1 kg / cm < 2 > at a rotation speed of 800 rpm for 30 seconds, and then cleaned and dried using Candelar OSA 6300 KLA Tencor surface fine The number of particles was determined and measured using a reader.

Surface roughness ( Ra )

The surface roughness (nm) was obtained by processing the glass disk using EDC-1800 processing machine at a pressure of 1 kg / cm 2 at a rotation speed of 800 rpm for 30 seconds, using a manufactured artificial leather, and then cleaning and drying it using a Nanoscope IIIa AFM .

division Titanium content (ppm) Surface roughness Ra (nm) Process cleanliness (number of particles) Example 1 0 0.18 67 Example 2 148 0.47 164 Comparative Example 1 1858 0.71 926 Comparative Example 2 261 0.68 442

Claims (5)

A nonwoven fabric made of ultrafine fibers of 0.1 denier or less; And
And an elastic polymer resin impregnated in the nonwoven fabric,
The content of the inorganic particles as a whole is 200 ppm or less,
Wherein the surface roughness (Ra) is 0.1 to 0.7 nm. The method according to claim 1,
Wherein said inorganic particles have a Mohs hardness of from 6 to 9. The method according to claim 1,
Wherein the inorganic particles comprise titanium dioxide. The method according to claim 1,
Wherein the microfine fibers comprise polyamide fibers. delete