KR102469378B1 - Composition for Surface Coating Fabrics or Leather and The Method for Coating Fabrics or Leather - Google Patents

Abstract

The present invention relates to a composition for coating a surface of a fabric, which has advantages of: having excellent coating properties; being harmless to the human body; being environmentally friendly; having a wide range of uses such as for suede, leather, and fabrics, and in particular, improving the texture when coated on suede, leather, and the like; and improving mechanical properties and thermal stability. The composition for coating a surface of a fabric comprises a waterborne polyurethane dispersion, and a water soluble eggshell membrane.

Description

Composition for surface coating of fabric and method for coating fabric using the same {Composition for Surface Coating Fabrics or Leather and The Method for Coating Fabrics or Leather}

The present invention relates to a composition for coating the surface of fabric, and more particularly, to a composition for coating the surface of fabric with excellent touch and good scratch resistance by including a water-soluble egg shell membrane, and a coating method for improving the tactile feel of fabric using the same it's about

Surface treatment is performed on the surfaces of plastics, home appliances, furniture, automobiles, etc. to protect the surface of an article and impart aesthetics. The surface treatment of an article is performed in various ways according to the use and design of the product, and in some cases, a high-gloss surface treatment may be performed, and a matte surface treatment may be performed.

In addition, the coating agent used for surface treatment of articles has resistance to scratches caused by sand and dust (scratch resistance), properties that are not chemically altered by acid rain (acid resistance), and properties that are not damaged by organic solvents such as gasoline. (solvent resistance) and other various performances are required, and sufficient moldability must be secured so that it can be applied uniformly and stably to the surface of the article as much as possible.

High-quality fabrics such as leather and suede are widely used for clothing, bags, shoes, industrial and vehicle materials, etc., but they are vulnerable to moisture and water, and are easily damaged by external friction and flexibility. In order to solve this problem, the surface is coated with a coating agent, and as most solvent-type urethane resins are used, environmental pollution and harm to the human body caused by rare organic compounds generated from products during the manufacturing process have become a problem.

Accordingly, a waterborne polyurethane dispersion (WPU) that does not use a solvent has been developed, but has problems such as a stiff touch, low bending resistance, and yellowing.

In order to solve the problem of the water-dispersed polyurethane, a coating agent with additives such as silica and calcium carbonate has been developed. It deteriorates stain resistance, expands color transfer, and has economic problems as an expensive raw material.

Therefore, there is a need for a composition for coating the surface of a fabric having high mechanical properties and thermal stability while having an excellent overall uniform feel when applied to the fabric.

Patent Document 1. Korean Patent Publication No. 10-2020-0094497

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is a composition for coating the surface of a fabric capable of providing excellent mechanical properties, thermal stability and high-quality tactile properties, and for automobile interior materials coated with these compositions It is to provide a skin material.

Another object of the present invention is to provide a coating method for improving the feel and mechanical properties of fabric.

The present invention, in order to achieve the above object, a water-dispersed polyurethane dispersion (Waterborne polyurethane dispersion, WPU); and a water-soluble eggshell membrane prepared by mixing an eggshell membrane (ESM) with sodium hydroxide and an organic solvent.

According to one embodiment of the present invention, the composition may include 90 to 99.9% by weight of the aqueous polyurethane dispersion and 0.1 to 10% by weight of the water-soluble egg shell membrane.

According to another embodiment of the present invention, the composition may include 98 to 99.5% by weight of the aqueous polyurethane dispersion and 0.5 to 2% by weight of the water-soluble egg shell membrane.

According to another embodiment of the present invention, the water-soluble eggshell membrane may be obtained by mixing an eggshell membrane (ESM) with sodium hydroxide and an organic solvent and stirring at 40 to 80° C. for 1 to 3 hours.

According to another embodiment of the present invention, the organic solvent may be one or more selected from the group consisting of methanol, ethanol, acetone, propanol and butylene glycol.

According to another embodiment of the present invention, the water-soluble eggshell membrane may be neutralized with hydrochloric acid after treatment with sodium hydroxide.

According to another embodiment of the present invention, the fabric may be any one or more selected from the group consisting of artificial leather, natural leather, suede and fabric.

In order to achieve the second object, the present invention provides a skin material for automobile interior materials coated with the fabric surface coating composition.

In order to achieve the third object, the present invention provides a method for coating a fabric comprising forming a coating layer on the surface of the fabric by applying the composition for coating the surface of the fabric to the fabric.

The composition for coating the surface of fabric of the present invention has excellent coating properties, is harmless to the human body, and is environmentally friendly. In addition, it has a wide range of use such as suede, leather, and fabric, and in particular, it has the advantage of improving the feel when coated on suede and leather, and improving mechanical properties and thermal stability.

1 is a SEM image taken using a scanning electron microscope after applying the composition for coating the surface of fabric prepared in Comparative Example 2 to leather.
Figure 2 is a SEM image taken using a scanning electron microscope after applying the composition for fabric surface coating prepared in Comparative Example 3 to leather.
3 is a SEM image taken using a scanning electron microscope after applying the composition for coating the surface of fabric prepared in Comparative Example 4 to leather.
4 is a SEM image taken using a scanning electron microscope after applying the composition for coating the surface of fabric prepared in Comparative Example 5 to leather.
5 is a SEM image taken using a scanning electron microscope after applying the composition for coating the surface of fabric prepared in Example 1 to leather.
6 is a SEM image taken using a scanning electron microscope after applying the composition for coating the surface of fabric prepared in Example 2 to leather.
7 is a SEM image taken using a scanning electron microscope after applying the composition for coating the surface of fabric prepared in Example 3 to leather.
8 is a SEM image taken using a scanning electron microscope after applying the composition for coating the surface of fabric prepared in Example 4 to leather.
9 is a graph of tensile strength (kgf/cm ² ) measured after applying the composition for coating the surface of fabric prepared in Examples 1 to 4 and Comparative Examples 1 to 5 to leather.
10 is a graph of elongation at break (%) measured after applying the composition for coating the surface of fabric prepared from Examples 1 to 4 and Comparative Examples 1 to 5 to leather.
11 is a graph showing thermal stability evaluation results of an egg shell membrane (ESM) without any treatment and a water-soluble egg shell membrane (S-ESM) of Preparation Example 1.
12 is a graph showing the thermal stability evaluation results of the compositions for coating the surface of fabric prepared from Examples 1 to 4 and Comparative Examples 1 to 5.
13 is a graph showing the measurement of the plane friction coefficient for each skin material using a tactile feel evaluator.
14 is a graph showing the plane friction coefficient of each fabric coated with the fabric surface coating composition prepared from Example 4 (S-ESM / WPU 2.0 wt%) and Comparative Example 1 (WPU) measured by a tactile feel evaluator.

Hereinafter, the present invention will be described in detail.

One aspect of the present invention is a water-dispersed polyurethane dispersion; and a water-soluble eggshell membrane prepared by mixing an eggshell membrane (ESM) with sodium hydroxide and an organic solvent.

The composition for coating the surface of fabric of the present invention includes a water-soluble egg shell membrane (S-ESM) together with a water-dispersed polyurethane dispersion, so that excellent touch and feel, as well as excellent mechanical properties and thermal stability can be imparted to the fabric. That is, it is used to protect the surface of fabrics such as artificial leather, natural leather, suede and fabric to protect the fabric from damage and to improve and improve the feel.

The water-dispersed polyurethane dispersion is chemically a general term for polymers having urethane bonds (~NH~COO) in the polymer chain, and is not particularly limited as long as it is widely used commercially using isocyanate and polyol as main raw materials.

The water-dispersed polyurethane dispersion is an eco-friendly material and has the advantage of containing a hydrophilic group in the resin, but has relatively low weather resistance and low thermal stability, poor mechanical properties, and impairs the unique touch of the adherend. .

The isocyanate is selected from the group consisting of hexamethylene diisocyanate (HDI), 4,4-methylene diphenyl diisocyanate (MDI), isophorone diisocyanate (IPDI), and cyclohexyl-1,4-diisocyanate (H12MDI) It may be any one or more, and the polyol may be any one selected from the group consisting of polypropylene glycol (PPG), polyethylene glycol (PEG), polytetramethylene glycol (PTMEG), and polyester glycol.

It may further include a chain extender, and the chain extender includes 1.6-hexanediol (HD), ethylene glycol (EG), 1,4-butanediol (BD), ethylenediamine (EDA), diethylenetriamine (DETA ), triethylenetetramine (TETA), and tetraethylenepentamine (TEPA).

In the present invention, the water-dispersed polyurethane dispersion may have a tensile strength of 200 kgf/cm ² or more according to KSM 6518 in the form of a dry film, and an elongation at break (%) of 700% or more.

The eggshell membrane is a double-layered eggshell membrane present at the boundary between the eggshell and egg white of an egg of one or more birds selected from the group consisting of chicken, duck, quail and ostrich.

The egg shell membrane may be obtained by separating the egg shell membrane from bird eggs and then pulverizing it by a known method such as freeze grinding, low temperature grinding, dry grinding, or the like.

Specifically, the eggshell membrane may be pulverized to 1 to 20 μm, preferably 1 to 10 μm, more preferably 3 to 8 μm, and most preferably 5 μm.

The water-soluble eggshell membrane may be obtained by hydrolyzing an eggshell membrane (ESM) by mixing it with sodium hydroxide and an organic solvent. Specifically, it may be a water-soluble egg shell membrane having excellent hydrophilicity produced by hydrolyzing the disulfide group of an amino acid such as cysteine of the egg shell membrane.

The present invention can solve the problem of waste disposal of discarded eggs by using egg shell membranes separated from discarded bird eggs, so resource recycling is high.

Specifically, the water-soluble eggshell membrane may be obtained by mixing an eggshell membrane (ESM) with an alkali agent such as sodium hydroxide and an organic solvent and stirring at 40 to 80° C. for 1 to 3 hours.

At this time, if the reaction temperature is less than 40 ° C, the hydrolysis of the egg shell membrane is not properly performed, and if it exceeds 80 ° C, the water-soluble egg shell membrane protein is denatured and the effect may be reduced.

In addition, when the reaction time is less than 1 hour, the hydrolysis of the egg shell membrane is not properly performed, and when the reaction time exceeds 3 hours, the water-soluble egg shell membrane protein is excessively decomposed, and the effect may be reduced.

The organic solvent is not particularly limited thereto, but may preferably be any one or more selected from the group consisting of methanol, ethanol, acetone, propanol, and butylene glycol, and more preferably methanol or ethanol.

The water-soluble egg shell membrane is preferably neutralized with hydrochloric acid after sodium hydroxide treatment for mixing with the water-dispersed polyurethane dispersion. In addition, in order to minimize the content of impurities, it is appropriate to carry out a process of separation and purification in a conventional manner after neutralization before introducing.

The fabric surface coating composition includes 90 to 99.9% by weight of the water-dispersed polyurethane dispersion and 0.1 to 10% by weight of the water-soluble egg shell membrane, preferably 98 to 99.5% by weight of the water-dispersed polyurethane dispersion and 0.5 to 2% by weight of the water-soluble egg shell membrane. It may contain weight percent. When the water-dispersion polyurethane dispersion is included below the above range, the properties expressed due to the water-dispersion polyurethane dispersion are not properly expressed, and when the above range is exceeded, the unique touch of the fabric is inhibited, or the weather resistance and thermal stability are relatively , and problems such as deterioration of mechanical properties may occur.

When the water-soluble egg shell membrane is included in an amount less than the above range, the water-dispersible polyurethane dispersion is excessively included, resulting in stiff fabric, impaired tactile feel, relatively low weather resistance and thermal stability, and poor mechanical properties. Problems such as may occur, and when included in excess of the above range, problems such as non-uniform surface morphology or poor mechanical properties may occur.

Therefore, when the water-soluble egg shell membrane is included in an amount of 0.1 to 10% by weight, preferably 0.5 to 2% by weight, it is possible to improve tactile sensation while improving excellent morphology, mechanical properties, and weather resistance without generating a peculiar odor caused by the water-soluble egg shell membrane.

The composition for coating the surface of fabric of the present invention is coated on the surface of fabric to improve weather resistance, tensile strength, elongation at break, thermal stability, etc. of the fabric, and to improve the feel, and the fabric is artificial leather, natural leather, suede and fabric. It may be any one or more selected from the group consisting of.

The coating formed from the composition for coating the surface of fabric of the present invention was 2 to 4 times better in tensile strength and elongation at break compared to the conventional non-treated eggshell membrane added as an additive, especially in the case of elongation at break, water-dispersed poly It was confirmed that the coating formed from the composition for coating the surface of fabric was significantly superior to the coating treated with only the urethane dispersion (WPU).

In addition, in terms of touch, it can be seen that the coating formed from the composition for coating the surface of the fabric gives a touch or touch that is close to a higher quality material.

Therefore, the composition for coating the surface of the fabric described in the present invention can be applied to the fabric to provide a coating having improved mechanical properties and thermal stability as well as a tactile or touch feeling close to that of a high-quality material.

Another aspect of the present invention relates to a skin material for automobile interior materials coated with a fabric surface coating composition.

The skin material for automobile interior materials is not particularly limited as long as it is for automobile interior materials, but may be selected from the group consisting of artificial leather, natural leather, suede, and fabric.

The skin material for automobile interior materials includes a base material and a coating layer made of the composition on the base material. In this case, a primer layer may be further included between the base material and the coating layer. Specifically, as the base material, for example, a leather base material is most often used. To describe the leather base material, the leather base material corresponds to a non-woven fabric of an artificial leather product, and a primer, which is an adhesion reinforcing agent for coating agent treatment on the non-woven fabric, is used. can be placed. The primer is a general adhesion enhancing agent, and is not particularly limited. The composition for coating the surface of the fabric is applied on the primer layer, and a leather product can be obtained by natural drying after application.

In addition to the above composition, various known or well-known components may be optionally added to the composition for coating the surface of a fabric according to the present invention.

The coating of the fabric surface coating composition may be applied by any method standard in the art, such as electronic coating, spraying, electrostatic spraying, dipping, rolling, brushing, and the like. Coatings of the present invention can be applied at dry film thicknesses of 0.01 to 100 μm.

Another aspect of the present invention relates to a method for coating a fabric, which includes forming a coating layer on the surface of the fabric by applying a composition for coating the surface of the fabric to the fabric.

The method may further include coating a primer layer on the fabric to improve adhesion between the fabric and the coating layer.

The primer is a general adhesion enhancing agent, and is not particularly limited.

A fabric having improved mechanical properties and feel may be prepared by applying the composition for coating the surface of the fabric on the fabric or the primer layer and drying the composition.

The application of the present invention may be applied by any method standard in the art, such as electrocoating, spraying, electrostatic spraying, dipping, rolling, brushing, and the like. Coatings of the present invention can be applied at dry film thicknesses of 0.01 to 100 μm.

The fabric is not particularly limited thereto, but is preferably usable as an automobile interior material, and more preferably may be any one selected from artificial leather, natural leather, suede, and fabric, and the surface of the fabric is coated on the surface of the fabric according to the above method. By treating the composition, it is possible to protect the fabric from damage and to improve and improve the feel.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments. However, these examples are intended to explain the present invention in more detail, and it will be apparent to those skilled in the art that the scope of the present invention is not limited thereto.

Preparation Example 1. Preparation of water-soluble egg shell membrane (S-ESM).

After washing the eggshell membrane (ESM) obtained from the eggshell, drying it, the dried eggshell membrane is pulverized at a low temperature to have a particle size of 5, 12, and 17 μm, among which a particle size of 5 μm The egg shell membrane was weighed, and 600 g of an aqueous sodium hydroxide solution having a concentration of 10% per 100 g and 200 g of ethanol (EtOH) were added. That is, it was prepared so that the weight ratio of the dried egg shell membrane material, sodium hydroxide aqueous solution, and ethanol was 1:6:2. Then, the mixture was reacted at 60 °C for 2 hours with stirring. After the reaction, 2 M hydrochloric acid was added to neutralize to pH 7.2-7.4, and the upper liquid was recovered by centrifugation at high speed (9000 rpm). The collected supernatant was placed in a dialysis membrane, dialysis was performed to remove Cl- remaining in the supernatant, and dried at 55 to 60 ° C. to prepare a soluble eggshell membrane (S-ESM).

Examples and Comparative Examples. Preparation of a composition for coating the surface of fabric

A water-soluble polyurethane dispersion (WPU) PUD 2008 purchased from Aekyung Chemical was added with the water-soluble eggshell membrane prepared in Preparation Example 1 according to Table 1 below, and vigorously stirred to prepare a composition for coating the surface of fabric.

division
(weight%) S-ESM ESM WPU Example 1 0.5 - 99.5 Example 2 One - 99 Example 3 1.5 - 98.5 Example 4 2.0 - 98 Comparative Example 1 0 0 100 Comparative Example 2 - 0.5 99.5 Comparative Example 3 - One 99 Comparative Example 4 - 1.5 98.5 Comparative Example 5 - 2.0 98

Experimental Example 1. Morphology of Composition for Fabric Surface Coating

When the composition for coating the surface of fabric prepared from Examples and Comparative Examples was coated, the surface morphology was confirmed by scanning electron microscopy (SEM). Specifically, after each of the compositions for coating the surface of fabric prepared in Examples and Comparative Examples was produced as a flat thin film, SEM images of each coating material were measured using a scanning electron microscope.

1 is a SEM image taken using a scanning electron microscope for a thin film made of the composition for coating the surface of fabric in Comparative Example 2, and FIG. 2 is a scanning electron microscope for a thin film made of the composition for coating the surface of fabric in Comparative Example 3 A SEM image taken using a microscope, Figure 3 is a SEM image taken using a scanning electron microscope for a thin film made of the composition for coating the surface of the fabric of Comparative Example 4, Figure 4 is a surface coating of the fabric of Comparative Example 5 It is a SEM image taken using a scanning electron microscope for the thin film made of the composition for. At this time, the left side is a picture magnified by X5,000 magnification, and the right side is a photo enlarged by X20,000 magnification. bar = 1 µm

1 to 4, it was confirmed that the eggshell membrane was irregularly dispersed on the coating. In particular, it was confirmed that as the content of the eggshell membrane included in the composition increased, the degree of dispersion or aggregation of the eggshell membrane on the thin film was not constant.

5 is a SEM image taken using a scanning electron microscope for a thin film made of the composition for coating the surface of fabric in Example 1, and FIG. 6 is a scanning electron microscope for a thin film made of the composition for coating the surface of fabric in Example 2. A SEM image taken using a microscope, Figure 7 is a SEM image taken using a scanning electron microscope for a thin film made of the composition for coating the surface of fabric in Example 3, Figure 8 is a surface coating of fabric in Example 4 It is a SEM image taken using a scanning electron microscope for the thin film made of the composition for. At this time, the right side is a photo magnified by X5,000 magnification, and the left side is a photo magnified by X20,000 high magnification.

Looking at Figures 5 to 8, it was confirmed that the thin films prepared with the fabric surface coating compositions of Examples 1 to 4 had very regular filler dispersion. In addition, it was confirmed that no dispersion or aggregation of the filler was observed.

Experimental Example 2. Evaluation of mechanical properties of the composition for coating the surface of fabric

After preparing each of the compositions for fabric surface coating prepared in Examples 1 to 4 and Comparative Examples 1 to 5 as a flat thin film, the tensile strength (kgf/cm ² ) and elongation at break for each coating material itself (elongation at break, %) was measured as follows. In Comparative Example 1, as a control, a WPU composition (virgin WPU) not containing an eggshell membrane was fabricated into a flat thin film and then measured.

First, each of the above samples was applied using a hot press device at 160 ° C. and 15 MPa pressure for t90 hours to prepare a specimen for measuring physical properties (2 mm sheet, dumbbell No. 3 specimen (MD direction and TD direction, respectively)). The physical properties were evaluated by the following method, and specifically, the tensile strength was measured by cutting into a dumbbell-shaped No. 3 specimen in the MD direction and the TD direction after processing into a 2 mm sheet (100 mm in width, 100 mm in length), respectively.

Tensile strength (Kgf/cm 2 ) was measured at room temperature with a dumbbell-type No. 3 specimen at a test speed of 500 mm/min in accordance with KSM 6518.

Elongation at break (%) represents the amount of elongation before breaking under certain controlled conditions as a percentage of the initial length. It was measured in the same way as for tensile strength.

9 is a graph of tensile strength (kgf/cm ² ) of thin films prepared from compositions for coating the surface of fabrics of Examples 1 to 4 and Comparative Examples 1 to 5, and according to this, the surface of fabrics of Examples 1 to 4 It can be seen that the thin film prepared from the coating composition has a remarkable tensile strength of 200 kgf/cm ² . The thin film prepared with the composition for coating the surface of fabric in Example 4 had a tensile strength 20 to 30% higher than the others (2 to 4 times better than the comparative example).

On the other hand, the tensile strength of the thin films prepared from the compositions for coating the surface of fabrics of Comparative Examples 2 to 5 was gradually lowered to 50 kgf/cm ² .

Figure 10 is a graph of elongation at break (%) for thin films prepared with compositions for coating the surface of fabrics of Examples 1 to 4 and Comparative Examples 1 to 5, according to which the compositions for coating the surface of fabrics of Comparative Examples 2 to 5 The value of the thin film decreased significantly as the content of the shell membrane increased. In particular, in the case of Comparative Example 5, the elongation at break was 498.4%.

It was confirmed that the thin films prepared with the compositions for coating the surface of fabrics of Examples 1 to 4 were 784% to 825%. It can be seen that this is a higher elongation at break than the conventional aqueous polyurethane dispersion coating agent (Comparative Example 1).

That is, it can be seen that the fabric surface coating compositions of Examples 1 to 4 have mechanical properties similar to or higher than those of the conventional water-dispersed polyurethane dispersion coating agent (Comparative Example 1).

Experimental Example 3. Evaluation of thermal stability (thermal property) of the composition for coating the surface of fabric

The thermal stability of the untreated egg shell membrane, the water-soluble eggshell membrane of Preparation Example 1, and the composition for coating the surface of fabric prepared from Examples 1 to 4 and Comparative Examples 1 to 5 using thermogravimetric analysis (TGA). was evaluated, and the results are shown in FIGS. 11 and 12. TGA was measured in a nitrogen atmosphere, and the heating rate was 10 °C/min.

11 is a graph showing the thermal stability evaluation results of an untreated egg shell membrane (ESM) and a water-soluble egg shell membrane (S-ESM) of Preparation Example 1. Decomposition was confirmed to occur.

12 is a graph showing the thermal stability evaluation results of the compositions for coating the surface of fabric prepared from Examples 1 to 4 and Comparative Examples 1 to 5, according to which, the fabric surface of Examples 1 and Comparative Example 2 having the lowest filler content The coating compositions had decomposition temperatures (T _d ) of 295.98 °C and 302.07 °C, respectively. As the content of the filler increased, the decomposition temperature increased, but it was found to be within 320 ℃.

Therefore, it can be seen that the compositions for coating the surface of fabric prepared from Examples 1 to 4 and Comparative Examples 1 to 5 all have high thermal stability with a decomposition temperature of 290 to 350 °C.

Experimental Example 4. Planar friction evaluation of the composition for coating the surface of fabric

1) Evaluation of plane friction coefficient by skin material

It was confirmed that the degree of tactile sensation can be evaluated by the plane friction coefficient. At this time, samples were prepared from natural leather, suede, and fabric used as skin materials for automobile interior materials. For natural leather, 3 types of corrected grains with different colors were used: semi-aniline as the top grade, Nappa as the high grade, and normal grade (Corrected Grain 1: Dark Gray, Corrected Grain 2). : Beige, corrected grain 3: gray) (corrected grain 1, 2, 3). For the suede, Alcantara (Alcantara S.p.A) and Lamous (Asahi Kasei) were used as non-woven suede, and Rosen (Korea MICRO FIBER) was used as circular suede. As the fabric, a fabric for automobile interior materials (Biptex Co., Ltd.) (Woven) was used.

The degree of tactile feel of fabrics can be evaluated by measuring the plane friction coefficient of natural leather and suede (Polymer (Korea), Vol. 43, No. 1, pp. 77-84 (2019)). For the tactile evaluation, a constant load, speed, and direction were applied to a tactile evaluation device (HEIDON Type 33, SHINTO Scientific) that can simultaneously measure plane friction and vertical load in the X, Y directions through an X, Y, Z 3-axis load cell. A controllable jig was combined. Existing friction evaluators can only evaluate friction in one direction, but this tactile feel evaluator can simultaneously measure plane friction in both X and Y directions under an applied load, so the actual plane friction of the material surface can be quantified. After the sample is attached to the attachment plate, the coefficient of plane friction is measured by sliding the sample in a circular direction on the stage under constant load and speed conditions. Planar friction evaluation was performed at 10 mm/sec in a sample size of 40 mm × 40 mm, a load of 100 g, and a 10 diameter circle method.

13 is a graph showing the measurement of the plane friction coefficient for each skin material using a tactile feel evaluator. According to this, it was confirmed that the higher the grade and material of the skin material, the higher the plane friction coefficient (natural leather > suede > fabric). However, in the case of the same fabric, it was confirmed that the high-grade grade had a lower plane friction coefficient than the general grade (Corrected Grain 1, 2, 3>Semi-aniline=Nappa). Furthermore, even in the case of the same suede material, it can be confirmed that the higher grade has a lower plane friction coefficient (Rosen>Alcantara = Lamous). That is, in the case of the same type of fabric, the higher grade material has a lower plane friction coefficient.

2) Evaluation of plane friction of the composition for coating the surface of fabric

Example 4 (S-ESM / WPU 2.0 wt%), the composition for fabric surface coating prepared from Comparative Example 1 (WPU) was measured for the plane friction coefficient in the same way as described above to evaluate the tactile sensation grade. The results are shown in FIG. 14 .

Specifically, the composition for coating the surface of fabric prepared from Comparative Example 1 (WPU) was prepared as a flat thin film (WPU Film), Example 4 (S-ESM / WPU 2.0 wt%) for coating the surface of fabric prepared Composition for coating the surface of a fabric prepared from a substrate made of a flat thin film (S-ESM/WPU 2.0 wt% Film), Example 4 (S-ESM/WPU 2.0 wt%), and Comparative Example 1 (WPU) Each of the substrates prepared by applying each to the surface of circular suede rosen (Rosen, KOREA MICRO FIBER) (suede) and PVC synthetic leather (leather), respectively, the plane friction coefficient was measured in the same way as above.

14 is a graph showing the plane friction coefficient of each fabric coated with the fabric surface coating composition prepared from Example 4 (S-ESM / WPU 2.0 wt%) and Comparative Example 1 (WPU) measured by a tactile feel evaluator.

According to this, when the surfaces of suede and natural leather are coated with the fabric surface coating composition of Example 4, it can be seen that the plane friction coefficient decreases more than that of suede and natural leather. In the case of the same fabric and material, a decrease in the plane friction coefficient means that it has a higher quality touch. In the case of the conventional coating agent, there was a problem that the texture peculiar to the fabric was lowered. However, the composition for coating the surface of fabric in Example 4 has the advantage of being able to maintain the texture of the fabric at a level similar to that of the original fabric as much as possible, unlike conventional coating agents.

In particular, it was confirmed that the film made of the composition for coating the surface of fabric in Example 4 had a significantly lower coefficient of plane friction than the film made only of the water-dispersible polyurethane dispersion (WPU), and the composition of the present invention was compared to conventional coating agents. It can be seen that the texture of the fabric can be further improved.

Claims (9)

water-dispersed polyurethane dispersion; and
A water-soluble eggshell membrane prepared by mixing an eggshell membrane (ESM) with sodium hydroxide and an organic solvent;
The composition includes 98 to 99.5% by weight of the aqueous polyurethane dispersion and 0.5 to 2% by weight of the water-soluble egg shell membrane,
The water-soluble eggshell membrane is a composition for coating the surface of fabric, characterized in that obtained by mixing an eggshell membrane (ESM) with sodium hydroxide and an organic solvent and stirring at 40 to 80 ° C. for 1 to 3 hours. delete delete delete According to claim 1,
The organic solvent is a composition for coating the surface of fabric, characterized in that at least one selected from the group consisting of methanol, ethanol, acetone, propanol and butylene glycol According to claim 1,
The composition for coating the surface of fabric, characterized in that the water-soluble eggshell membrane is neutralized with hydrochloric acid after treatment with sodium hydroxide. According to claim 1,
The fabric surface coating composition, characterized in that at least one selected from the group consisting of artificial leather, natural leather, suede and fabric. A skin material for automobile interior materials coated with the fabric surface coating composition according to claim 1. A method of coating a fabric comprising applying the composition for coating the surface of a fabric according to claim 1 to a fabric to form a coating layer on the surface of the fabric.

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