KR20010079335A - manufacturing method of artificial hides, natural quality, and that artificial hides - Google Patents

Abstract

PURPOSE: A process for preparing the titled artificial leather improved in compactness of a fine porous layer by impregnating high density sea-island type microfiber nonwoven fabric in a polyurethane resin solution and artificial leather obtained thereby are provided. Whereby, the artificial leather having texture and durability similar to natural leather and excellent air permeability and moisture permeability can be mass-manufactured. CONSTITUTION: This process comprises the steps of: impregnating high density sea-island type microfiber nonwoven fabric in a dimethylformamide solvent system dissolved by a polyurethane resin; forming a fine porous layer(5) by a substitution reaction of water and dimethylformamide and drying; dipping the nonwoven fabric in a sodium hydroxide aqueous solution and removing a polyester component; buffing; dyeing; forming a silver face layer(3) by filling soluble synthetic resin; forming a surface layer(4) by coating a synthetic resin aqueous liquid on the upper part of the silver face layer; and inserting artificial leather into an uneven part of an embossing calendar at 170 to 180deg.C and pressing.

Description

Artificial leather manufacturing method of natural texture and artificial leather manufactured thereby {manufacturing method of artificial hides, natural quality, and that artificial hides}

The present invention relates to a method of manufacturing artificial leather of natural texture and artificial leather manufactured by the same, having a texture and durability similar to that of natural leather, having a fine porous layer formed precisely, having excellent breathability and moisture permeability, and having a smooth surface and various colors. The present invention relates to a manufacturing method and a product capable of producing a large amount of uniform artificial leather.

Since ancient times, natural leather has been used as an indispensable object for our human beings. However, since natural resources are limited, they are not enough to meet the demand, and the supply and demand is gradually decreasing due to various environmental problems and the spread of animal protection movements originating in Europe.

As a result, many artificial and synthetic leathers such as nylon leather, polyvinyl chloride leather, and PU dry type leather appeared in order to find a substitute for natural leather, but physical strength as natural leather The structure, performance, and appearance could not be the same.

In general, a method of manufacturing artificial leather using a nonwoven fabric includes a nonwoven fabric using a mixed fiber made of nylon (nylon) -polystyrene (PS), polyethylene terephthalate (PET) -polystyrene (PS), and the like. Knife-coated a polyurethane solution melted with a water-soluble solvent on the nonwoven fabric that is the bottom of the leather to form a silver layer for the skin of the leather, and the polyurethane on a release paper where the leather pattern is highlighted. PU) solution is coated to make a sheet, and the sheet is bonded to the silver layer by a transfer method, and then solidified polyurethane (PU) solution in water and washed with water, then removing the release paper and dried, the surface of the leather pattern A film is formed, and the lower part of the artificial skin in which the hexahedral layer and the fiber layer of the leather, in which the transfer layer and the silver surface layer are combined, are sequentially laminated. It is completed.

As the existing artificial leather manufactured as described above solidifies and washes the polyurethane (PU) coating layer in water without removing the release paper, in this process, the polyurethane (PU) solvent falls out of the film where the leather pattern is expressed. Polyurethane (PU) coating layer has a problem of not breathable and moisture-permeable because it can not go out and exit only to the fiber layer.

In addition, there is a possibility that the product after the finished product is deteriorated due to poor washing of the solvent at the time of washing, there is also a decrease in durability, there is another problem that the leather itself is not soft and stiff feeling because the microporous layer is not formed. .

Accordingly, the present invention has been made to solve the above problems, a high density (0.2 ~ 0.3 gr / cm 3) sea-island type microfiber nonwoven fabric (nylon / CO-PET; 65) different from the conventional nonwoven fabric / 35) is used to impregnate the polyurethane (PU) resin solution with a concentration of 75 to 100% by one-shot method, which greatly improves the microporous layer density of the netting layer and has breathability and moisture permeability. For the purpose.

In addition, after the buffing (ethylene-vinyl acetate; EVA), latex (latex), polyvinyl alcohol (PVAL), acrylic resin (polymethyl methacrylate (PMMA), polyethylene acid (polyethylene oxide) PO) and amino acid are filled and coated with gravure coating method to increase the density of microporous layer further by filling and coating the silver and epidermal layers. .

1 is a manufacturing process flow chart of the present invention

2 is a block diagram of artificial leather according to the present invention

[Explanation of symbols on the main parts of the drawings]

1: nonwoven fabric 2: mesh layer

3: silver surface layer 4: epidermal layer

5: microporous layer 6: artificial leather

S1: impregnation process S2: elution process

S3: Buffing Process S4: Dyeing Process

S5: Filling process S6: Surface treatment process

S7: Embossing Process S8: Tumbling Process

The present invention relates to a method of manufacturing artificial leather of natural texture and artificial leather manufactured by the same, having a texture and durability similar to that of natural leather, having a fine porous layer formed precisely, having excellent breathability and moisture permeability, and having a smooth surface and various colors. The present invention relates to a manufacturing method and a product capable of producing a large amount of uniform artificial leather.

Hereinafter, described in detail through the drawings illustrating the manufacturing process of the present invention,

Figure 1 shows a manufacturing process flow chart of the present invention is divided into eight steps of the whole process.

First, a high density (0.2-0.3 gr / cm 3) sea-island type microfiber nonwoven fabric (1) is used, and its composition is 65% nylon and polyethylene terephthalate copolymers; -PET) 35%, which is arranged in parallel or in an opposite direction without going through a woven fabric process, and has a felt-like nonwoven fabric (1) bonded by a synthetic resin adhesive to a mesh layer of artificial leather (6). Use 2).

Then, a non-woven fabric (1) was provided with a solution in which 75-100% of a solid content of polyurethane (PU) resin was dissolved in a dimethylformamide (DMF) solvent system used as a solvent for various chemical reactions. The impregnating tank is impregnated with 400 ~ 1000gr of polyurethane (PU) per 1㎡ of nonwoven fabric (1) by one-shot method, and then transferred to a coagulation bath containing water to be immersed in water and dimethylformamide (DMF). The microporous layer 5 can be obtained through a substitution reaction. After that, since the net layer 2 provided with a plurality of microporous layers 5 is provided through a dryer, the impregnation process S1, which is the first process, is completed.

Next, when the mesh layer 2 is immersed in an elution tank containing a strong alkaline corrosive sodium hydroxide solution, the polyester, which is one component of the nonwoven fabric 1, is rapidly eroded and removed. Therefore, the netting layer 2 changes its material into a soft elastic body and completes the second step. This step is referred to as the eluting step (S2).

When the elution step (S2) is finished, the surface of the reinforcement layer (2) is not smooth because the dyeing is not evenly dyed, so to increase the smoothness of the surface of the reinforcement layer (2), the polishing wheel (buff) to the reinforcement layer (2) The third step is completed through a buffing step S3 that is pressed and rotated onto the surface.

In addition, after passing through the buffing step (S3) is subjected to a dyeing process (S4) for applying a dye of various colors to the surface of the netting layer (2), the synthetic resin is non-absorbent to the dye, so that the dye is fixed to the dye The solvent must be mixed with the dye. That is, since the dye is mixed with the polyurethane (PU) to a desired color in a high temperature dyeing machine, the fourth process is completed to obtain the netting layer 2 having excellent coloring and uniform color of the surface.

Then, water-soluble resins ethylene-vinyl acetate (EVA), latex (latex), polyvinyl alcohol (PVAL), acrylic resin (polymethyl methacrylate (PMMA), polyethylene acid (PO) And filling a solution such as amino acid to the level of 1/3 or 1/2 of the thickness of the nonwoven fabric 1 to form the silver layer 3, but using a gravure coater layer 2 layer 2 In the same manner, the dense microporous layer 5 is formed and solidified to complete the filling step S5 which is the fifth step.

Looking at the role of the material to be filled in detail, ethylene vinyl acetate (EVA) and latex (latex) has excellent rubber elasticity to improve the elasticity and flexibility of the silver surface layer (3), polyvinyl alcohol (PVAL) is a silver surface layer ( 3) improves the wear resistance and hygroscopicity of the acrylic resin, acrylic resin (PMMA) serves to help the water and pigmentation, polyethylene acid (PO) also improves the function of the water and cold resistance, and contains amino acids (polypeptide ) Acts as a strong antibacterial agent, preventing corrosion of the resin mixture.

The epidermal layer 4 coated on the upper surface of the silver surface layer 3 is an aqueous solution such as polyurethane (PU), acrylic resin (PMMA), fluororesin, amino acid, etc. by the same gravure coating method as the silver surface layer 3. The surface is coated and then solidified to complete the surface treatment step S6 as a sixth step.

Polyurethane (PU) coated on the epidermal layer (4) has a role of excellent ozone resistance and abrasion resistance, fluorine resin does not invade in strong acid or strong alkaline solvents play a role of preventing aging even after long use. Acrylic resins (PMMA) and amino acids play a role in water resistance and antibacterial activity.

In addition, in order to have a surface pattern of a pattern similar to a variety of natural leather to form a surface pattern by pressing with an embossing calender (embossing calender), wherein the uneven portion of the embossed calendar at the temperature between 170 ~ 180 ℃ By pressing the artificial leather (6) strongly to generate a unique squeeze on the skin layer (4), by replacing the uneven part of the machine to enable the embossing of the desired surface pattern, the embossing process (S7) of the seventh process To complete.

Finally, the tumbling process (S8), which is the eighth process, is made of natural texture by tumbling the surface using a tumbler heated to about 100 ° C. in order to obtain the texture of natural leather. Artificial leather 6 can be obtained.

The artificial leather manufactured through the above process is similar to the texture of natural leather (FULL GRAIN), which is chrome-treated as it is, and the surface is dyed and painted. It can be used for such purposes, and it is expected to play a role in preventing the overfishing of indiscriminate animals because it replaces the demand for limited natural leather.

As described above, the present invention relates to a method of manufacturing artificial leather of natural texture and artificial leather manufactured thereby, impregnating a nonwoven fabric in a polyurethane (PU) resin solution having a concentration of 75 to 100%, and the upper surface thereof. Filled and coated with a variety of synthetic resins in the material has a texture and durability similar to natural leather, the overall microporous layer is formed densely has the effect of obtaining artificial leather excellent in breathability and moisture permeability.

In addition, the surface strength is greater than that of natural leather, wear resistance is excellent, not only a variety of colors, but also easy to work such as cutting, sewing, adhesion, there is another effect that can be uniformity and mass production of the product.

Claims (5)

In the manufacturing method of artificial leather, The high-density island-in-the-sea microfiber (1) is impregnated with a dimethylformamide (DMF) solvent system in which a polyurethane (PU) resin is dissolved, and then a microporous layer is substituted by water and dimethylformamide (DMF) in a coagulation bath After forming (5), the impregnation step (S1) to dry through a dryer, Elution step (S2) in which the non-woven fabric (1) is immersed in a highly corrosive sodium hydroxide solution to quickly erode and remove the polyester component, A buffing process (S3) for pressing and rotating the polishing wheel onto the surface of the nonwoven fabric 1, Dyeing process (S4) of applying a dye of a desired color on the surface of the nonwoven fabric (1), Filling process (S5) of filling the water-soluble synthetic resin to form the silver surface layer (3), Surface treatment step (S6) of forming a skin layer 4 by coating a synthetic resin aqueous solution on the silver surface layer (3), Embossing process (S7) for inserting and pressing the artificial leather (6) to the uneven portion of the embossed calender at a temperature of 170 ~ 180 ℃ to generate a unique mold; Tumbling process (S8) for processing the epidermal layer 4 with the electric heater heated to about 100 ℃, Artificial leather manufacturing method of natural texture, characterized in that consisting of. The method of claim 1, In the impregnation step (S1), a high-density island-in-the-sea microfiber nonwoven fabric (1) is immersed in a solution in which a solid content of polyurethane (PU) resin is dissolved in a dimethylformamide (DMF) solvent system by 75 to 100%. Method of manufacturing artificial leather of natural texture, characterized in that impregnated with a non-woven fabric (1) impregnated with a polyurethane (PU) of 400 ~ 1000gr per square meter. The method of claim 1, The material to be filled in the filling process (S5) is water-soluble resin ethylene-vinyl acetate (EVA), latex (latex), polyvinyl alcohol (PVAL), acrylic resin (polymethyl methacrylate; PMMA), Manufacture of artificial leather of natural texture, characterized in that the polyethylene oxide (PO) and amino acid aqueous solutions are filled to a level of 1/3 to 1/2 of the thickness of the nonwoven fabric (1) to form a silver surface layer (3). Way. The method of claim 1, The material to be coated in the surface treatment process (S6) is a polyurethane (polyurethane), acrylic resin (polymethyl methacrylate (PMMA), fluororesin, fluororesin, amino acid (amino acid) aqueous solution is coated on the upper surface of the silver surface layer (3) (4) is a natural leather artificial leather manufacturing method characterized in that the formation. The high-density island-in-the-sea microfiber (1) is impregnated with a dimethylformamide (DMF) solvent system in which a polyurethane (PU) resin is dissolved, and then a microporous layer is substituted by water and dimethylformamide (DMF) in a coagulation bath (5) was formed, dried through a dryer, and then immersed in a highly corrosive aqueous sodium hydroxide solution to quickly erode and remove the polyester, and then pressed and rotated on the surface of the elastomer to smooth the surface. Then, a dye of a desired color is applied to the surface of the elastic body, and then filled with a water-soluble synthetic resin to form a silver surface layer (3), and then coated with a synthetic resin solution on top of it to coagulate, then the artificial leather ( 6) Artificial leather characterized by having the texture of natural leather, which is manufactured by inserting and pressing to generate a unique mold, and then processing the surface with an electric machine.