KR100510770B1 - Manufacturing method of artificial leather. - Google Patents

Abstract

The present invention relates to a method for producing artificial leather having a short length and smooth surface and high quality appearance and feel.

The present invention is impregnated with a polyurethane solution in the interwoven nonwoven fabric composed of a fiber-forming component and a soluble component, and then dissolved in a soluble component, buffing and post-processing to produce an artificial leather, the polyurethane solution is impregnated The nonwoven fabric is squeezed by passing it between knives, and during the buffing process, a paraffin-based surface treatment agent is applied to the polyurethane impregnated fabric with 10 to 20 g / m 2, and then buffed again to give a unique numeric feeling (slippery touch). To prepare.

Description

Manufacturing method of artificial leather.

The present invention relates to a manufacturing method of artificial leather, in particular, nubuck artificial leather, which has a short cow length and a smooth surface, and which has a high appearance and feel.

Nubuck artificial leather is mainly used for clothing and shoes.

In the prior art of producing silk-yak artificial leather, Japanese Patent Laid-Open Nos. 7-42083, 4-136280, and 7-133592 disclose (3) single spinning fineness by mixing and stretching sea component and island component polymer. To prepare a composite fiber of 5 denier level,

(Ii) Crimping these composite fibers and cutting them to produce short fibers (staples); (i) three-dimensional entanglement of the staples by processes such as carding and needle punching to produce nonwoven fabrics, and (iii) the nonwoven fabrics. After pressing by hot pressing or hot air compression and padded with polyvinyl alcohol aqueous solution, (iii) impregnating the polyurethane solution therein to prepare a polyurethane impregnated cloth having elasticity, (iii) the polyurethane impregnated cloth is a high-temperature fur Treated with a chloroethylene solution or the like to elute the sea component in the impregnated fabric to make the fibers ultra-fine, (i) slicing and initial buffing, and (iii) applying the water-based polyurethane to the initially buffed polyurethane impregnated fabric and then continuing. It has been proposed a method of manufacturing a buckwheat artificial leather by buffing.

Since the prior arts apply water-based polyurethane during the buffing process, it is possible to obtain an effect of improving the surface smoothness of the polyurethane impregnated cloth and strongly supporting the hair. However, the water-based polyurethane applied during the buffing process forms a film and improves the modulus of the wool surface of the final product artificial leather. As a result, there is a problem that the flexibility of the hair is reduced and the feel is rough.

The present invention is to improve the smoothness of the surface of the cow wool to provide a method of manufacturing artificial leather excellent in numeric feeling (smooth surface), short cow length, high-quality appearance and feel.

The present invention relates to a method for producing artificial leather having an excellent noumeri feeling (smooth surface) appearance and feel.

More specifically, the present invention impregnates a polyurethane solution in a nonwoven fabric in which composite fibers composed of a fiber-forming component and a soluble component are impregnated with a polyurethane solution, thereby producing artificial leather by dissolving, buffing and post-processing the soluble component. An artificial leather characterized by squeezing a nonwoven fabric impregnated with a urethane solution (hereinafter referred to as polyurethane impregnated cloth) through a knife, and applying a paraffin-based surface treatment agent to the polyurethane impregnated fabric with a gravure roll during the buffing process. It relates to a manufacturing method of.

Hereinafter, the present invention will be described in detail.

The present invention improves the surface smoothness by passing the polyurethane impregnated cloth between the knives and at the same time during the buffing process by applying a paraffin surface treatment agent to the polyurethane impregnated cloth with a gravure roll or the like 10 to 20 g / ㎡ and then buffing again It is characterized by improving the feeling (slip surface).

First, the fiber-forming component polymer and the usable-release component polymer are mixed and stretched to prepare a composite fiber having a single yarn fineness of 3 to 5 deniers, and then crimped and cut to prepare a composite fiber staple.

In this case, polyamide resin or the like is used as the fiber-forming polymer, and low density polyethylene or copolyester is used as the usable component polymer.

It is preferable that the number of crimps of the composite fiber staples is about 10 to 25 pieces / inch and the length is about 1 to 4 inches.

In the present invention, the polymer type, single yarn fineness, and crimp number and length of the composite fiber staple of the usable component and the fiber forming component are not particularly limited.

Next, the nonwoven fabric is manufactured by interweaving the composite fiber staples three-dimensionally by the opening, carding, and needle punching processes.

The weight, thickness, apparent density, and the like of the nonwoven fabric are appropriately adjusted according to the use.

The prepared nonwoven fabric is shrunk for several minutes with steam or the like.

At this time, the area shrinkage of the nonwoven fabric is preferably about 10%.

The nonwoven fabric is padded in a polyvinyl alcohol aqueous solution and then impregnated with a polyurethane solution to prepare a polyurethane impregnated cloth having elasticity. At this time, the non-woven fabric impregnated with the polyurethane solution (hereinafter referred to as polyurethane impregnated fabric) is passed between the knives to improve the surface smoothness of the polyurethane impregnated fabric. The smoothness of the surface of the polyurethane impregnated cloth should be excellent to prevent the surface treatment agent applied during the buffing process from forming a film on the surface of the wool.

The polyurethane impregnated fabric is treated with a high temperature perchloroethylene solution or the like to elute the sea component in the impregnated fabric to thereby minimize the fibers.

After slicing the polyurethane impregnated fabric, the initial buffing is applied thereto, and a paraffin-based surface treatment agent is applied to the gravure roll or the like, followed by post-processing such as buffing and dyeing to prepare artificial leather.

In the present invention, it is more preferable to apply a paraffin-based surface treatment agent with a gravure roll during the buffing process.

The paraffin-based surface treatment agent used at this time is preferably composed of ether polyurethane, paraffin (polyolefin wax), methyl ethyl ketone and toluene.

Representative composition ratio examples of the paraffinic surface treatment agent used in the present invention are as follows. However, in the present invention, the composition ratio of the paraffinic surface treatment agent is not particularly limited.

-Paraffin Surface Treatment Agent Composition-

Ether-based polyurethane (solid content 30%): 100 parts by weight

Paraffin (polyolefin wax): 20-40 parts by weight

Methyl ethyl ketone: 40-60 parts by weight

Toluene: 40 to 60 parts by weight

The application amount of a paraffin type surface treating agent shall be 10-20 g / m <2>.

When the coating amount is less than 10 g / m 2, the nostalgic feeling (slippery feeling) is not sufficiently improved, and when the coating amount is 20 g / m 2, the noumeri feeling (slippery feeling) is no longer improved, which is uneconomical.

The gravure roll used in the present invention means that a net-shaped intaglio pattern is formed on the roll surface. It is preferable to use a gravure roll of about 5 to 20 mesh.

In the present invention, when the gravure roll is used, the paraffin-based surface treatment agent is applied to the polyurethane impregnated fabric, so that the paraffin-based surface treatment agent is not applied to the entire surface of the impregnated fabric. It is applied to the surface portion part in a dot state. As a result, the paraffinic surface treatment agent can be prevented from forming a film on the surface of the wool.

Therefore, the present invention can improve the feeling of nouri (slip feeling) without deteriorating the softness and feel of the artificial leather's hair, which is excellent in appearance and touch.

Artificial leather can be produced.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited only to the following examples.

Example 1

65 parts by weight of nylon-6 as an island component, 35 parts by weight of low-density polyethylene are mixed, spun and stretched into sea components, and then crimped and cut to give a composite fiber staple of 2 inches long, 3.5 denier single yarns and 18 crimps / inch. Manufacture.

This fiber is opened and carded and needle punched at a punching density of 1000 times / cm 2 to produce a three-dimensional entangled nonwoven fabric having a weight of 600 g / m 2, a thickness of 2.40 mm, and an apparent density of 0.250 g / cm 3.

The nonwoven fabric is shrunk with steam at 100 ° C. for 5 minutes (area shrinkage is 10%) and then padded with an aqueous polyvinyl alcohol solution.

Next, a copolymer-based polyurethane solution having a viscosity of 30% solids of 100,000 cps / 25 ° C. was impregnated into the nonwoven fabric and then passed through two knives to prepare a polyurethane impregnated cloth having a smooth surface. Thereafter, it is solidified, washed with water and dried in a general manner.

The impregnated cloth is immersed in a high temperature perchloroethylene solution and squeezed to decompose and remove the sea component in the composite fiber, thereby minimizing the fibers.

After slicing the ultrafine impregnated cloth into two pieces, the slicing surface is buffed into 240 mesh sandpaper and the surface is buffed once into 400 mesh sandpaper.

Using a 100 mesh gravure roll on a buffing cloth, 15 g / m 2 (based on drying) of the paraffin-based surface treatment agent was applied and then heated and dried at 110 ° C. for 3 minutes.

-Paraffin Surface Treatment Composition-

Ether-based polyurethane (solid content 30%): 100 parts by weight

Paraffin (polyolefin wax): 30 parts by weight

Methyl ethyl ketone: 50 parts by weight

Toluene: 50 parts by weight

After application, buff 4 times with 600mesh sandpaper. Subsequently, artificial leather for garments is manufactured by treating softeners, antistatic agents and the like after dyeing.

The results of evaluating the touch and appearance of the manufactured artificial leather are shown in Table 1.

Comparative Example 1

Non-woven fabric impregnated with polyurethane resin is passed through mangle instead of knife

The artificial leather for garments is manufactured under the same conditions and methods as in Example 1 except for squeezing and applying an aqueous polyurethane solution instead of a paraffinic surface treatment agent during the buffing process. The results of evaluating the touch and appearance of the manufactured artificial leather are shown in Table 1.

<Table 1> Feel and appearance evaluation results

Example 1 Comparative Example 1 touch Soft sense ◎ ○ Wet ○ ○ Noumeri persimmon ◎ × Exterior Tighting effect ○ × Uniformity ○ △

In the present invention, the touch and appearance evaluation of artificial leather is evaluated by 5 artificial leather experts 1 to 5 points, respectively, when the total score is 20 or more, ◎, 15 to 19 points are ○, 10 to 14 points Evaluates as (triangle | delta) and x which is less than 10 points.

Artificial leather produced by the method of the present invention has a smooth appearance of the surface of the wool without deterioration of the softness and feel of the hair, and has a very good feeling of numeri (smooth surface) and has a high-quality appearance and feel.

Claims (2)

In manufacturing artificial leather composed of ultrafine fibers and polyurethane resin, the nonwoven fabric impregnated with polyurethane solution is passed through a knife to squeeze, and a paraffin-based surface treatment agent is applied to the polyurethane impregnated cloth during the buffing process. Method for producing a silk-yak artificial leather, characterized in that buffing again after applying g / ㎡. The method of producing a lapis lazuli artificial leather according to claim 1, wherein the paraffin-based surface treatment agent is composed of ether polyurethane, paraffin (polyolefin wax), methyl ethyl ketone and toluene.