KR20050028137A - Manufacturing method for artificial leather having silver particles - Google Patents

Abstract

A manufacturing method of artificial leather is characterized by adhering silver particles on the leather, giving the leather antibacterial property and bactericidal property semi-permanently, coating release paper with a solvent type resin composition added silver colloid solution in a dry type manufacturing method and adding the silver colloid solution to a water mangle in a wet type manufacturing method. Artificial leather manufactured out of release paper formed patterns with a dry type method is obtained by the steps of: mixing methyl ethyl ketone, dimethyl formamide, a toner and dyes or pigment with solvent type polyurethane resin to make a resin composition; adding a silver colloid solution to the resin composition, followed by agitating a mixture; coating the release paper with the resin composition added silver colloid solution, followed by drying the release paper to form a surface layer; coating an upper side of the surface layer with an adhesive to form an adhesive layer; and then adhering a back sheet on the adhesive layer, followed by drying the back sheet. The artificial leather manufactured out of fabric, non-woven fabric, high density non-woven fabric and superfine fiber non-woven fabric with a wet type method is obtained by the steps of: mixing the dimethyl formamide, the toner and the dyes or the pigment with the solvent type polyurethane resin to make an infiltrating solution; soaking the non-woven fabric in the infiltrating solution; dipping the infiltrated fabric in a coagulating bath mixed water and the dimethyl formamide to coagulate the polyurethane resin absorbed into the infiltrated fabric; putting the silver colloid solution to a water mangle, followed by agitating the silver colloid solution with water; passing the infiltrated fabric through the water mangle, followed by dehydrating the infiltrated fabric; and then drying the infiltrated fabric.

Description

MANUFACTURING METHOD FOR ARTIFICIAL LEATHER HAVING SILVER PARTICLES}

The present invention relates to a method of manufacturing artificial leather to which silver particles are fixed, and more particularly, by semi-permanently fixing fine silver particles of nano-meter scale having antibacterial and bactericidal effect during processing of artificial leather. The present invention relates to a method for preparing artificial leather to which silver particles may have antibacterial and bactericidal effects.

The antimicrobial properties of finely pulverized fine particles of metal elements such as mercury, silver, copper, cadmium, chromium, nickel, lead, cobalt and zinc have been well known since ancient times. However, despite the long history of the utility of metal powders, most of the metals except silver are heavy metals and cannot be applied to products that directly affect the human body. In the case of silver, it is harmless to the human body, and when it is made of fine particles, it has been tried to apply it to many products.

Silver's antibacterial activity depends on its surface area. Therefore, many forms of crushing silver into fine particles are used. As a method for utilizing silver as a fine particle, there is a method of producing silver colloid in the form of extremely small particle size by electrically decomposing silver in a solution or dissolving the monovalent ions of silver in a solution and then chemically reducing the silver. Another method is to adsorb and immobilize silver on silica or zeolite having a large specific surface area. Among them, a liquid reduction method of dissolving silver salts such as silver nitrate in a solvent and then reducing silver ions by adding a reducing agent such as hydrazine, boron hydride and sodium salt to form a colloidal solution is widely used. Distilled water, ethanol, ethylene glycol are mainly used as a solvent used at this time.

As such, the excellent sterilization and antibacterial effects of silver are well known, and the fields to which the silver is applied are also various. In particular, the method of coating silver particles on fabrics such as artificial leather is mainly applied by adding silver colloid to the raw materials of artificial leather or by applying silver colloid solution directly to the final product using artificial leather, but the effect does not last long. It is shown.

When the artificial leather is wet, it is subjected to several washing and dehydration processes. Therefore, silver particles added to the raw material of the artificial leather are mostly lost, so that the product manufactured by the artificial leather cannot effectively exhibit antibacterial and sterilizing ability. There is a problem. In addition, when the silver particles are directly applied to the final product using the artificial leather has a disadvantage that the silver particles are lost by the washing performed by the user using the product, the antibacterial and sterilization ability can not be sustained for a long time.

Accordingly, an object of the present invention is to provide a method for producing artificial leather which can exert antibacterial and sterilizing ability semi-permanently by fixing silver particles to artificial leather at a suitable stage for wet or dry manufacturing method of artificial leather.

That is, in the dry manufacturing method of artificial leather, the solvent-type resin composition to which silver colloidal solution is added is also included on a release paper, thereby providing a method of manufacturing artificial leather having a continuous antibacterial and sterilizing ability. In addition, by adding a silver colloidal solution to the water mangle (expansion-compression dehydration process) in the wet manufacturing method of artificial leather, to provide a method of manufacturing artificial leather that is not separated after the silver particles are fixed.

According to a preferred embodiment of the present invention in order to achieve the above object of the present invention, by using a release paper having a predetermined pattern formed on the surface of the artificial leather by sequentially laminating the skin layer, the adhesive layer and the back sheet by a dry process In the manufacturing method, a step of preparing a resin composition by mixing methyl ethyl ketone, dimethylformamide, toner and a dye or pigment of a predetermined color to a solvent-type polyurethane resin, adding a silver colloidal solution to the resin composition and stirring And applying the resin composition to which the silver colloidal solution is added to the release paper to a predetermined thickness and drying to form a skin layer, applying an adhesive to a top of the skin layer to a predetermined thickness to form an adhesive layer and the adhesive layer. Attaching the back sheet and drying the artificial particles are silver particles comprising the step of drying The production method of the leather is provided.

Preferably, the manufacturing method may further include adding a silver colloidal solution to the urethane ink and stirring to form an ink composition, and printing the ink composition on the lower portion of the epidermal layer. In addition, the manufacturing method may further include adding a silver colloidal solution to the urethane-based surface treating agent and stirring to form a surface treating agent composition, and surface treating the epidermal layer with the surface treating agent composition.

At this time, the silver colloidal solution is added to 0.01 ~ 10wt% based on the polyurethane resin.

According to another preferred embodiment of the present invention in order to achieve the above object of the present invention, by impregnating the solvent-type resin composition by a wet process using a woven fabric, a general nonwoven fabric, a high-density nonwoven fabric, which is a commercially supported substrate, artificial 1. A method of manufacturing leather, the method comprising: mixing an dimethylformamide, a toner, and a dye or a pigment of a predetermined color with a solvent-type polyurethane resin to form an impregnation solution; forming the impregnation cloth by dipping the nonwoven fabric in the impregnation solution; Immersing the impregnated cloth in a coagulation bath mixed with water and dimethylformamide to solidify the polyurethane resin absorbed in the impregnated cloth, and putting a silver colloidal solution into a water mangle in which a compression crimping and dehydration process is performed; Dewatering and passing the impregnated fabric passed through the coagulation bath through the water mangle and the war Provided is a method for producing artificial leather to which silver particles are fixed, comprising the step of drying the impregnated cloth through the mangle.

Preferably, the method further comprises the step of adding a silver colloidal solution to the urethane ink and stirring to form an ink composition and printing the ink composition on the dried impregnated fabric. In addition, the manufacturing method further includes the step of adding a silver colloidal solution to the urethane-based surface treatment agent to form a surface treatment agent composition and the step of treating the surface of the dried impregnated cloth with the surface treatment agent composition.

At this time, the silver colloidal solution is added to 0.01 ~ 10wt% based on the polyurethane resin.

According to the manufacturing method of the artificial leather fixed silver particles according to the present invention, by fixing the silver particles to the artificial leather in a step suitable for the wet or dry manufacturing method of artificial leather artificial leather capable of exhibiting antibacterial and sterilizing ability semi-permanently It can manufacture. That is, in the dry manufacturing method of artificial leather, by including the solvent-type resin composition to which the silver colloidal solution is added to the release paper, it is possible to manufacture artificial leather having a continuous antibacterial and sterilizing ability. In addition, by adding a silver colloidal solution to the water mangle in which the expansion-compression-dehydration process is performed in the wet manufacturing method of artificial leather, it is possible to manufacture artificial leather which is not detached after the silver particles are fixed.

Hereinafter, with reference to the accompanying drawings will be described in detail a manufacturing method of artificial leather is fixed silver particles according to the preferred embodiments of the present invention, the present invention is not limited or limited by the following embodiments.

Example 1

The artificial leather according to the first embodiment of the present invention is formed by sequentially applying a skin layer and an adhesive layer on a release paper embossed with a predetermined pattern, and then drying, and forming a commercial woven fabric, a general nonwoven fabric, and a high density on the adhesive layer. It is completed by attaching a back sheet such as a nonwoven fabric or a microfiber nonwoven fabric and then separating the release paper.

In order to form the epidermal layer, 100 wt% of a solvent type polyurethane (PU, polyurethane) resin was dispersed in a mixed solvent of 40 wt% of methyl ethyl ketone (MEK, methylethylketone) and 10 wt% of dimethylformamide (DMF, dimethylformamide), followed by stirring. In the mixed solvent in which the polyurethane is dispersed, a resin composition is further prepared by mixing a mixture of 30 wt% of a toner, which is a filler, and an additive of additives such as dyes and antioxidant stabilizers for coloring.

In order to impart antimicrobial and bactericidal effects to the artificial leather, a silver colloidal solution in which nano-meter-sized silver particles are dispersed is added and stirred. At this time, the silver colloidal solution is added 1.5wt% based on 1000ppm solution.

The resin composition to which the silver colloidal solution is added is coated on the release paper using a knife coater, and then dried at about 80 to 100 ° C. At this time, the resin composition is applied in an amount of 130g / ㎡, the thickness is about 0.02mm to form a skin layer.

Subsequently, an urethane-based adhesive is applied and dried on the skin layer to volatilize the solvent contained in the adhesive to form an adhesive layer. Subsequently, the back sheet is attached to the adhesive layer and the release paper is separated to prepare an artificial leather intermediate product.

The intermediate product may be used as a product as it is, may be further performed to improve the quality. That is, the color of the artificial leather can be adjusted by printing on the skin layer with a urethane-based ink. At this time, a silver colloidal solution may also be added to the ink. In addition, a surface treatment such as gloss is applied to the surface of the epidermal layer using a urethane-based surface treatment agent. Also in this case, a silver colloidal solution can be added and used for the said surface treating agent.

Example 2

The artificial leather according to the second embodiment of the present invention is completed by impregnating a sheet such as a commercial woven fabric, a general nonwoven fabric, a high density nonwoven fabric, or a microfiber nonwoven fabric in a solvent type polyurethane resin composition, and then solidifying and drying.

In order to prepare an impregnation solution for impregnating the sheet, 100 wt% of a solvent type polyurethane (PU, polyurethane) resin is dispersed in a solvent of 100 wt% of dimethylformamide (DMF, dimethylformamide), followed by stirring. In the mixed solvent in which the polyurethane is dispersed, an impregnation solution is prepared by mixing 15 wt% of a toner, a filler, and 2 wt% of a mixture of an additive such as a dye and an antioxidant stabilizer.

When the sheet is impregnated into the impregnation solution, the impregnation solution is absorbed by the porous sheet to form an impregnation cloth. Subsequently, the impregnated cloth enters a coagulation bath in which water and dimethylformamide are mixed at a ratio of 1: 9. When the impregnating cloth is allowed to react in the coagulation bath for about 50 minutes, coagulation of the polyurethane resin occurs due to the incompatibility of water and the polyurethane resin. That is, the water in the coagulation bath is diffused into the impregnating cloth, the dimethylformamide in the impregnation cloth is diffused into the coagulation bath to remove the dimethylformamide in the impregnation cloth, and at the same time the polyurethane resin is phase separated from the water. Thereby forming porous pores.

Subsequently, the impregnated fabric passed through the coagulation bath is subjected to expansion, compression, and dehydration process, which is a washing process. The expansion crimping and dehydration process is passed through the impregnating cloth through a water mangle containing a mixture of additives such as water repellent, antistatic agent, softening agent, and paste solution in water, and dewatered by using a cylinder pressure. The remaining dimethylformamide is removed. At this time, in order to give an antibacterial and bactericidal effect to the artificial leather, a silver colloidal solution formed by dispersing silver particles having a nanometer size is added to the water mangle container and stirred. The silver colloidal solution is added 1.5wt% based on 1000ppm solution.

After the dehydration process, the impregnated fabric is dried to prepare artificial leather.

The artificial leather can be used as a product as it is, may be further performed an additional process to improve the quality. That is, the color of the artificial leather can be adjusted by printing on the skin layer with a urethane-based ink. At this time, a silver colloidal solution may also be added to the ink. In addition, a surface treatment such as gloss is applied to the surface of the epidermal layer using a urethane-based surface treatment agent. Also in this case, a silver colloidal solution can be added and used for the said surface treating agent.

Figure 1 shows a surface micrograph of the artificial leather according to the present embodiment, Figure 2 shows a spectrum analysis component analysis of the artificial leather shown in FIG.

Referring to FIGS. 1 and 2, the synthetic leather is analyzed by using a field emission scanning electron microscope (FE-SEM, Field Emission, Scanning, Electron Microscope) as shown in the following table.

Element Weight (%) Atomic (%) C 41.06 54.96 O 37.18 37.36 Si 1.97 1.13 Ti 19.34 6.49 Ag 0.45 0.07 Total 100%

That is, in Table 1 and the artificial leather it can be seen that the silver particles contained 0.45% based on the weight ratio.

Test results using the artificial leather sterilization power is shown in the table below.

Strain 1 Initial bacterial count 1.3 × 24 hours later <10 Bacterial reduction rate 99.9% Strain 2 Initial bacterial count 1.5 × 24 hours later <10 Bacterial reduction rate 99.9%

In Table 2, strain 1 is Staphylococcus aureus (ATCC 6538) and strain 2 is Escherichia coil (ATCC 25922). In addition, the test conditions were measured for the bacteria after shaking culture for 24 hours at 35 ± 1 ℃. As shown in Table 2, it can be seen that in the artificial leather to which silver particles are fixed, 99.9% of bacteria disappear after 24 hours and are almost completely sterilized.

As described above, according to the manufacturing method of artificial leather to which silver particles are fixed, the antimicrobial and sterilizing ability can be exhibited semi-permanently by fixing silver particles to artificial leather at a stage suitable for wet or dry manufacturing method of artificial leather. Artificial leather can be produced. That is, in the dry manufacturing method of artificial leather, by including the solvent-type resin composition to which the silver colloidal solution is added to the release paper, it is possible to manufacture artificial leather having a continuous antibacterial and sterilizing ability. In addition, by adding a silver colloidal solution to the water mangle in which the expansion-compression-dehydration process is performed in the wet manufacturing method of artificial leather, it is possible to manufacture artificial leather which is not detached after the silver particles are fixed.

In the above described the manufacturing method of artificial leather to which silver particles are fixed according to a preferred embodiment of the present invention, the present invention is not limited by the above-described embodiment and the gist of the present invention claimed in the following claims Those skilled in the art to which the present invention pertains will appreciate that various modifications can be made without departing from the scope of the present invention.

1 is a surface micrograph of an artificial leather according to a second embodiment of the present invention.

2 is a spectral graph of the component analysis of the artificial leather shown in FIG.

Claims (8)

In the method of manufacturing artificial leather by sequentially laminating the skin layer, the adhesive layer and the back sheet by a dry process using a release paper having a predetermined pattern formed on the surface, Preparing a resin composition by mixing methyl ethyl ketone, dimethylformamide, toner and a dye or pigment of a predetermined color with a solvent type polyurethane resin; Adding and stirring a silver colloidal solution to the resin composition; Applying the resin composition to which the silver colloidal solution is added to the release paper to a predetermined thickness and drying to form a skin layer; Applying an adhesive to the upper portion of the skin layer to a predetermined thickness to form an adhesive layer; And A method of manufacturing artificial leather to which silver particles are fixed, comprising attaching and drying the back sheet to the adhesive layer. The method of claim 1, Adding a silver colloidal solution to the urethane ink and stirring to form an ink composition; And And printing the ink composition on a lower portion of the skin layer. The method of claim 1, Adding a silver colloidal solution to the urethane-based surface treatment agent and stirring to form a surface treatment composition; And Surface treatment of the skin layer with the surface treatment agent composition, characterized in that the manufacturing method of artificial leather fixed silver particles. The method of claim 1, wherein The silver colloidal solution is a manufacturing method of artificial leather with silver particles are fixed, characterized in that 0.01 ~ 10wt% is added based on the polyurethane resin. In the method of manufacturing artificial leather by impregnating the solvent type resin composition by a wet process using a woven fabric, a general nonwoven fabric, a high density nonwoven fabric, a microfiber nonwoven fabric which is a commercially supported substrate, Preparing an impregnation solution by mixing dimethylformamide, toner and a dye or pigment of a predetermined color with a solvent type polyurethane resin; Forming the impregnation fabric by dipping the nonwoven fabric in the impregnation liquid; Solidifying the polyurethane resin absorbed by the impregnating cloth by dipping the impregnating cloth into a coagulation bath in which water and dimethylformamide are mixed; Putting the silver colloidal solution into a water mangle in which the expansion crimping and dehydration process is performed and stirring with water; Dewatering after passing the coagulation cloth passed through the coagulation bath through the water mangle; And A method for producing artificial leather to which silver particles are fixed, comprising the step of drying the impregnated fabric passed through the water mangle. The method of claim 5, wherein Adding a silver colloidal solution to the urethane ink and stirring to form an ink composition; And The method of claim 1, further comprising the step of printing the ink composition on the dried impregnated fabric. The method of claim 5, wherein Adding a silver colloidal solution to the urethane-based surface treatment agent and stirring to form a surface treatment composition; And A method for producing artificial leather to which silver particles are fixed, further comprising the step of treating the surface of the dried impregnated fabric with the surface treating agent composition. The method according to claim 5, wherein The silver colloidal solution is a manufacturing method of artificial leather with silver particles are fixed, characterized in that 0.01 ~ 10wt% is added based on the polyurethane resin.