KR100997120B1 - A surface treatment method for artificial leathers, and artificial leathers having the surface treated by the same - Google Patents

Abstract

 The present invention relates to artificial leather, and more particularly, to a surface processing method of artificial leather and an artificial leather having a surface processed by the method.

The artificial leather surface processing method of the present invention and the artificial leather having the surface processed by the above method can express natural patterns without limitation, and work under the same conditions without setting individual conditions according to the fabric SPEC (thickness, density) of the artificial leather. It is possible to reduce the occurrence of defects due to the variation of the pattern (shape and irregularities) according to the deviation of the fabric SPEC according to the working conditions, and to give the emotional effect by inducing the color deviation simultaneously in addition to the pattern and irregularities effect. It works.

Artificial Leather Surface Processing, Etching Techniques, Reduction Cleaning

Description

A surface treatment method for artificial leathers, and artificial leathers having the surface treated by the same

  The present invention relates to artificial leather, and more particularly, to a surface processing method of artificial leather and an artificial leather having a surface processed by the method.

Natural leather is a random and sophisticated three-dimensional entangled structure, and the fiber bundles of collagen fibers composed of ultra-fine fibers are complex and dense, so that the draping, bulkiness, moisture permeability, and fine space between fibers due to flexibility and fineness As a material having advantages such as heat retention, it has been used as a material of the seat of the vehicle, the outer surface of the sofa and the coating material.

However, since natural leather having the above advantages is expensive and cannot be produced as demand, artificial leather having a structure similar to natural leather has been developed for the purpose of replacing natural leather, and this artificial leather is made by needle punching a nonwoven fabric. There is a needle punching felt. The needle punching felt needle punches an expensive special island-in-the-sea microfiber to form a three-dimensional entanglement structure, and forms a micro-porus by using a polyurethane resin to give elasticity, breathability, and moisture permeability.

Here, microfibers used as raw material fibers generally use fibers of 1.0 denier or less, and are composed of two-component sea-island types such as nylon and polyester, polyester and copolyester, nylon and polyethylene, etc. It is mainly used. The microfiber felt thus produced is subjected to a special and complicated process of impregnating a polyurethane resin, coagulating, washing with water, drying, and eluting one component of the fiber in a sodium hydroxide solution. After buffing and coating the polyurethane resin on the surface, it becomes a non-woven artificial leather.

The artificial leather made in this way has a dermis effect similar to that of natural leather, which has the advantages of soft flexibility, fineness, drape, bulkiness, moisture permeability, and warmth due to micro-space between fibers, but the cost burden of using expensive raw materials, It was caused by the deposition of sodium hydroxide solution to make the finer, the complicated process of eluting one of the two components, the environmental wastewater problem, and the productivity reduction problem.

In order to solve this problem, Korean Patent Laid-Open Publication No. 2003-4840 discloses an artificial leather; Impregnating the water-dispersed polyurethane resin first with a moisture content of about 50% on a nonwoven fabric and drying it to form an impregnated fabric; and a water-dispersed polyurethane resin mixed with a thickener on the upper surface of the impregnated fabric. A coating process by coating using a knife cutter to a thickness of the coating cloth, and a process of solidifying the coating cloth via a steam chamber having a temperature condition of about 75 to 100 ° C. over one and two stages; After reversing the 1st and 2nd steam chambers and dehydrating them through a water washing process, it is possible to manufacture artificial leather or to release coated paper with a special pattern formed between steam rollers and silicon rollers. The present invention discloses a method in which specific patterns are formed on the surface of artificial leather by being pressed together and left for about 10 hours at a temperature of about 70 to 80 ° C.

In addition, Korean Patent Publication No. 2008-49169 discloses artificial leather in which irregularities are formed on the surface of water-dispersed polyurethane resin in order to improve durability while forming specific patterns on the surface of artificial leather more clearly than the method disclosed in the patent. A method of producing a method comprising: dispersing a water-dispersed polyurethane resin and water in a weight ratio of 7: 3; Coating a water-dispersed polyurethane resin with a predetermined thickness on a release paper having an uneven pattern engraved on a surface thereof and repeating at least one drying operation in a dry chamber; Applying a water-dispersed urethane adhesive to the dried laminate coated on the release paper and drying in a semi-dry chamber; Bonding the fabric to the dried laminate and applying the adhesive, and compressing the resultant; drying in a semi-dry chamber and then again compressing it with a pressing roller; Disclosed is a method for forming an artificial leather surface pattern for forming a water-dispersed polyurethane resin, which is characterized by a step of releasing a release paper after aging a laminated body incorporating fabric paper in a aging chamber for a predetermined time.

However, in the method for forming a pattern on the surface of the artificial leather, all of the patents are a forced pattern forming method by physical compression in the heat treatment state, there is a limit to the natural pattern representation, the fabric SPEC (thickness, density) of artificial leather It is necessary to set individual condition according to the condition, and there is excessive possibility of defect due to the deviation of the pattern (shape and irregularities) according to the deviation of the fabric SPEC according to the working condition, and the emotional effect by inducing color deviation in addition to the effect of the pattern and irregularities At the same time there was a problem that can not be given.

The present inventors have completed the present invention by developing a technique for forming a pattern on the surface of the artificial leather by the etching method as a result of research efforts to solve the above problems.

Accordingly, an object of the present invention is to have an artificial leather surface processing method and a surface processed by the above method, which can provide a natural leather having a patterned surface formed of more natural lines as well as without limiting natural pattern representation. It is to provide artificial leather.

Another object of the present invention is the artificial leather surface processing method and the method which can form a desired pattern on the artificial leather fabric having different thickness and density under one condition without setting individual conditions according to the fabric SPEC (thickness, density) of artificial leather It is to provide an artificial leather having a machined surface.

It is still another object of the present invention to provide an artificial leather surface processing method of reducing the occurrence of defects caused by the variation of the pattern (shape and irregularities) according to the variation of the fabric SPEC of the artificial leather and the artificial leather having the surface processed by the method. To provide.

It is still another object of the present invention to provide an artificial leather surface processing method capable of simultaneously giving an emotional effect by inducing color deviation in addition to patterns and irregularities, and an artificial leather having a surface processed by the method.

Still another object of the present invention is to provide an artificial leather surface processing method which can easily change the pattern to be formed on the surface of the artificial leather in an inexpensive manner, and an artificial leather having a surface processed by the method.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

The present invention to prepare the artificial leather to achieve the above object; Forming a pattern on the surface of the artificial leather by an etching method; Drying the patterned artificial leather; Reducing and washing the dried artificial leather; And it provides an artificial leather surface processing method comprising the step of washing and drying the reduced washed artificial leather.

In a preferred embodiment, the method further comprises wet treating the dried artificial leather.

In a preferred embodiment, the wet treatment is steamed at 150 to 160 ° C. for 5-8 minutes.

In a preferred embodiment, further comprising the step of dyeing and drying the washed and dried artificial leather.

In a preferred embodiment, the step of forming a pattern on the surface of the artificial leather by an etching method includes the step of preparing an etching aid and screen printing the desired pattern on the surface of the artificial leather with the prepared etching aid.

In a preferred embodiment, the etching aid includes 30 to 50% by weight sodium hydroxide, 30 to 50% by weight alkaline alkaline solution and 10 to 30% by weight water.

In a preferred embodiment, the step of reducing and washing the dried artificial leather is immersed in the artificial leather in a solution tank of pH 7-8 and maintained for 30 seconds to 2 minutes.

In another aspect, the present invention provides an artificial leather characterized in that the processed by the method of any one of claims 1 to 7 having a pattern formed by lines having different thicknesses.

In a preferred embodiment, the line forming the pattern and the surface inside the line have color deviations.

The present invention has the following excellent effects.

First, according to the artificial leather surface processing method of the present invention and the artificial leather having the surface processed by the above method, it is possible not only to express a natural pattern without limitation, but also to provide an artificial leather having a patterned surface formed with more natural lines. can do.

In addition, the artificial leather surface processing method of the present invention can form a desired pattern on the artificial leather fabrics having different thicknesses and densities under one condition without setting individual conditions according to the fabric SPEC (thickness, density) of the artificial leather.

In addition, according to the artificial leather surface processing method of the present invention, the occurrence of defects due to the variation of the pattern (shape and irregularities) according to the variation of the artificial leather fabric SPEC is reduced.

In addition, according to the artificial leather surface processing method of the present invention, in addition to the pattern and irregularities effect, the emotional effect by inducing color deviation can be simultaneously provided.

In addition, according to the artificial leather surface processing method of the present invention, the pattern to be formed on the surface of the artificial leather can be easily changed in an inexpensive manner.

The terms used in the present invention were selected as general terms as widely used as possible, but in some cases, the terms arbitrarily selected by the applicant are included. In this case, the meanings described or used in the detailed description of the present invention are considered, rather than simply the names of the terms. The meaning should be grasped.

Hereinafter, the technical structure of the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Like reference numerals designate like elements throughout the specification.

1 is a process chart for the artificial leather surface processing method according to an embodiment of the present invention, Figure 2 is a photograph of the artificial leather surface processed to form a pattern according to Figure 1, Figure 3 is different according to Figure 1 It is a photograph of an artificial leather surface processed to form a pattern.

Looking at the artificial leather surface processing method according to an embodiment of the present invention with reference to Figure 1, first, artificial leather to be subjected to the surface processing is prepared. The artificial leather prepared here can be used conventionally known artificial leather without limitation to its type and material, but it is preferable to use the chamois (chamude) of the ultra-fine non-woven artificial leather. Chamud made through a special process based on microfiber technology has a beautiful appearance and soft touch, and is excellent in durability, moisture permeability, breathability, comfort and warmth.

In particular, a non-shape artificial leather is preferable for the surface treatment, but in some cases pre-dyed can be used, but it is more preferable to use artificial leather that is not dyed in advance. In order to induce natural color deviation, it is preferable to perform surface treatment and then dyeing process.

Once the artificial leather to be subjected to the surface processing is prepared, a desired pattern is formed on the surface of the prepared artificial leather using a chemical method, that is, an etching method, not a physical method.

To be more specific, first, an etching aid should be prepared, but an etching aid can be used without limitation as long as it is a known etching aid. However, sodium hydroxide may be used in an amount of 30 to 50 wt%, an alkali-based spray solution 30 to 50 wt%, and water. Preferably, the etching aid is prepared to contain 10 to 30% by weight. Here, the type and composition ratio of the components of the etching aid is to maintain the pH of the artificial leather surface and to control to have the most suitable solubility is the optimum composition and numerical range found through a number of experiments.

For example, the preparation process of the etching aid for performing the etching method of the present invention, 40% by weight of sodium hydroxide having a concentration of 48%, 40% by weight alkaline alkaline solution having a 10% concentration, 20% by weight of water After stirring for 20 to 30 minutes at room temperature by addition may be prepared by leaving at room temperature for 2 days to lower the elevated temperature due to the reaction heat.

When the etching aid is prepared, the prepared etching aid is inserted into the screen printing apparatus equipped with the screen on which the pattern to be formed on the surface of the artificial leather is formed, and then the screen is printed on the surface of the artificial leather to be surface-processed with the etching aid to form a pattern. . That is, the printed etching aid changes the surface of the artificial leather, that is, it forms a pattern naturally because the etching aid causes reaction such as melting the artificial leather as the etching aid spreads from the printed portion of the surface of the artificial leather.

As such, the artificial leather having a pattern formed by the etching aid is dried, and the drying step is preferably made by retaining the artificial leather for 2 to 3 minutes at 110 to 130 ° C.

Thereafter, the reduced washing step may be performed to prevent the reaction from being caused by the etching aid in the dried artificial leather, but as shown in the drawing, the wet treatment step may be performed first to highlight the etching effect more naturally. It is preferable. At this time, the wet treatment step may be performed by steaming the dried artificial leather at 150 to 160 ℃ for 5-8 minutes.

The wet synthetic leather is subjected to a reduction and washing step, which submerges the dried artificial leather (or wet and dried artificial leather) in a solution bath having a pH of 7-8 for 30 seconds to 2 minutes. Can be achieved.

Next, a step of washing and drying the reduced-washed artificial leather is performed. The step is performed to remove the reducing agent or the pH adjusting agent used in the reducing-washing step from the artificial leather. Synthetic leather washed at ~ 160 ℃ can be dried for 1 to 2 minutes to dry.

Through the above steps, as shown in FIG. 2, an artificial leather having a processed surface is formed to form a desired pattern on the surface of the artificial leather. In particular, as shown in Figure 2, the artificial leather having a surface processed by the surface processing method of the present invention is not only formed with lines having different thicknesses, but also has a pattern of naturally spread lines to have a more natural texture. .

In addition, when the artificial leather with a pattern formed by washing with water is dyed by a known method and dried, the line forming the pattern and the surface inside the line have a natural color deviation, as shown in FIG. It can be seen that a lovely two-tone color can be given.

As described above, the present invention has been illustrated and described with reference to preferred embodiments, but is not limited to the above-described embodiments, and is provided to those skilled in the art without departing from the spirit of the present invention. Various changes and modifications will be possible.

1 is a process chart for the artificial leather surface processing method according to an embodiment of the present invention

2 is a photograph of artificial leather surface-treated to form a pattern according to FIG.

3 is a photograph of artificial leather surface-treated to form a different pattern according to FIG.

Claims (9)

Preparing artificial leather; Forming a pattern on the surface of the artificial leather by an etching method; Drying the patterned artificial leather; Reducing and washing the dried artificial leather; And Artificial leather surface processing method comprising the step of washing the reduced washed artificial leather. The method of claim 1, Artificial leather surface processing method further comprising the step of wet-processing the dried artificial leather. The method of claim 2, The wet treatment step is artificial leather surface processing method, characterized in that for 5-8 minutes steam treatment at 150 to 160 ℃. The method of claim 1, The artificial leather surface processing method further comprises the step of dyeing the dried artificial leather by washing with water. The method of claim 1, Forming a pattern on the surface of the artificial leather by an etching method comprises the steps of preparing an etching aid and the step of screen printing the desired pattern on the surface of the artificial leather with the prepared etching aid. The method of claim 5, The etching aid is artificial leather surface processing method comprising 30 to 50% by weight of sodium hydroxide, 30 to 50% by weight alkaline alkaline solution and 10 to 30% by weight of water. The method of claim 1, The step of reducing and washing the dried artificial leather is artificial leather surface processing method characterized in that the artificial leather is immersed in a solution tank maintained at pH 7-8 and maintained for 30 seconds to 2 minutes. Artificial leather characterized in that it is processed by the method of any one of claims 1 to 7 having a pattern formed by lines having different thicknesses from each other. The method of claim 8, Artificial leather, characterized in that the line forming the pattern and the surface inside the line has a color deviation.

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