KR100974450B1 - Method for preparing artificial leather using recycled polyurethane waste and method of preparing recycled polyurethane resin for artificial leather - Google Patents

Abstract

PURPOSE: A method for manufacturing an artificial leather using polyurethane residue and a method for manufacturing a recycled polyurethane resin for the artificial leather are provided to protect environment by performing manufacturing processes through a dry operation without a solvent. CONSTITUTION: Polyurethane residue, which is remained in a bobbin, is collected, and is cut and broken in order to form polyurethane residue-based powder. 10 to 50 weigh% of polyurethane resin-based powder, 50 to 90 weight % of a solvent, including dimethyl acetamide or a mixture of dimethyl acetamide and dimethyl formamide and/or methyl ethyl ketone, are mixed to form a polyurethane residue-based solution. The solution is heated at the temperature of 100 to 150°C under water cut-off state to form a recycled polyurethane resin. The recycled polyurethane resin, a polyester urethane copolymer resin, the solvent, and a pigment are mixed to form a polyurethane resin composition. The composition is applied to the surface of cloth to form a laminate.

Description

Manufacturing method of artificial leather using a polyurethane residue and manufacturing method of the regenerated polyurethane resin for artificial leather TECHNICAL FIELD

The present invention relates to a method for manufacturing artificial leather by recycling the polyurethane residue remaining in the bobbin after weaving a polyurethane fabric, and in particular, recycled polyurethane residue is difficult to recycle compared to polyurethane resin or rubber due to the small plasticity By regenerating it into artificial leather, the cost of residue is drastically reduced. In the case of manufacturing artificial leather by dry process without using solvent, the polyurethane residue is simple and the process can protect the health and environment of workers. It relates to a method of manufacturing artificial leather using.

When weaving a polyurethane fabric, after weaving the fabric by feeding the polyurethane yarn wound on the bobbin to the loom, about 3 to 6% by weight of the bobbin is caused by some reasons such as tension problems between the polyurethane yarn and the loom. Polyurethane yarns remain as residues, and the remaining polyurethane residues are disposed of as they are because they do not have any special use.

Polyurethanes are regulated as designated wastes, and their disposal is very demanding. In addition, it is technically extremely difficult to simply recycle polyurethane by remelting, and recovering waste heat by incineration not only causes secondary pollution but also corrodes incineration facilities. The process is never easy.

Looking at the prior art regarding the reprocessing or recycling method of the conventional waste polyurethane resin or waste polyurethane foam, U.S. Patent No. 5,451,376 discloses finely crushed waste polyurethane foam and injection or injection with filler or polyurethane adhesion promoter. Disclosed are a mechanical regeneration method that constitutes an extruded product, or is properly crushed and compressed to utilize a re-adhesive foam. However, since the filler is also a thermosetting polymer, there is no interaction between the interface with the matrix resin used in the manufacture of the injection or extrusion molded product, and thus the mechanical properties of the extruded product are significantly lowered. It is difficult to do

In addition, US Patent No. 4,159,972 discloses a chemical regeneration method for depolymerizing a polyurethane resin using various solvents. The chemical regeneration method includes a hydrolysis reaction with water, a depolymerization reaction with various glycols, and a depolymerization reaction with amines, and this method has been actively studied due to its high economic efficiency and excellent utility. . However, in the chemical regeneration method, the hydrolysis method is disadvantageous in terms of economical low reaction conversion rate, whereas polyurethane depolymerization is carried out based on glycol depolymerization to prepare regenerated polyol, and the regenerated polyol is reacted with diisocyanates to make polyurethane foam. Attention is being paid to recycling as a raw material.

In addition, a method of decomposing a polyurethane resin by the above chemical method and recycling the decomposition product in polyurethane production has been reported. For example, US Pat. No. 3,404,103 discloses a process for degrading polyurethane foams in the presence of amines and alkali metal oxides or hydroxides or alkaline earth metal oxides, and US Pat. No. 3,708,440 discloses polyisocyanurate foams. A method is disclosed in which a powder is decomposed by heating to 175-250 ° C. in the presence of a mixture of aliphatic diols having 2 to 6 carbon atoms and dialkanolamines having 4 to 8 carbon atoms, and further described in US Pat. No. 4,110,266. Or a process for converting an amine to a polyol by reacting with an amine to convert it to a polyol and reacting the decomposition product containing the mixture of the polyol, urea and amine with an alkylene oxide in an autoclave at about 120 to 140 ° C. have.

In addition, Korean Unexamined Patent Publication No. 2998-32323 also mixes waste polyurethane foam powder with glycol and reacts at 120-300 ° C. in the presence of a catalyst to produce regenerated polyols, the regenerated polyols are mixed with pure polyols and diisocyanates Disclosed is a method for regenerating waste rigid polyurethane foam which forms a polyurethane foam in reaction with and a method for producing a polyurethane foam therefrom.

In accordance with the prior art disclosed above, by recycling or recycling a large plastic waste polyurethane resin or waste polyurethane foam, it is possible to protect the environment and to reduce the cost and waste space for disposal.

However, the prior arts disclosed above relate to methods of reprocessing or recycling waste polyurethane resins or waste polyurethane foams that are not easily polyurethane residues, but are more plastic than polyurethane residues and are easily dissolved and dissociated. Therefore, there is a problem in that the use of the prior art disclosed above is practically extremely difficult in order to recycle the polyurethane residue which is much less plasticized than the polyurethane resin or the polyurethane foam and is very difficult to reprocess or recycle.

Accordingly, there is an urgent need to develop a technology for converting a polyurethane residue having a very low plasticity compared to a polyurethane resin or a polyurethane foam to a useful material.

Therefore, the plasticity of the present invention is reduced and recycled to artificial leather by recycling the polyurethane residue, which is difficult to recycle compared to polyurethane resin or rubber, greatly reducing the cost of the residue treatment, and artificially by a dry process without using a solvent. In the case of manufacturing leather, to provide a dry manufacturing method of artificial leather using a polyurethane residue that can protect the health and environment of workers.

In order to achieve the above object, the present invention comprises the steps of recovering and cutting and shredding the polyurethane residue remaining in the bobbin to form a polyurethane residue powder; 10-50% by weight of the polyurethane residue powder, a solvent for residue dissolving using dimethylacetamide alone or 50-90% by weight of solvent for dissolving residue obtained by mixing dimethylformamide and / or methylethylketone with dimethylacetamide Mixing to form a polyurethane residue solution; Heating the polyurethane residue solution at a degree of order to 100 to 150 ° C. to form a recycled polyurethane resin; And it provides a method for producing a recycled polyurethane resin for artificial leather comprising the step of obtaining by cooling the recycled polyurethane resin.

In addition, in the present invention, dimethylformamide is used in the solvent for dissolving dimethylacetamide or solvent for dissolving 50 to 90 parts by weight of the regenerated polyurethane resin for artificial leather, 10 to 50 parts by weight of polyester urethane copolymer resin, and dimethylacetamide alone. And / or 30 to 70 parts by weight of a solvent for dissolving a resin formed by mixing methyl ethyl ketone, and 5 to 10 parts by weight of a pigment to form a polyurethane resin composition; Coating the polyurethane resin composition on a surface of a fabric to form a laminate in which a polyurethane resin coating layer is laminated; Solidifying the polyurethane resin coating layer by introducing the laminate into a coagulation solution in which dimethylformamide and / or methyl ethyl ketone are mixed in water; And it provides a wet manufacturing method of artificial leather using a polyurethane residue comprising the step of washing the laminate solidified with the polyurethane resin coating layer washed with water.

Separately, the present invention comprises the steps of recovering and cutting and shredding the polyurethane residue remaining in the bobbin to form a polyurethane residue powder; Forming a polymer composition by mixing 10 to 15 parts by weight of the polyurethane residue powder, 70 to 80 parts by weight of a water-soluble acrylic resin melt or a water-soluble polyurethane melt, and 2 to 4 parts by weight of a thickener; Applying the polymer composition to a surface of a fabric to form a laminate; And there is provided a dry manufacturing method of artificial leather using a polyurethane residue comprising the step of heat-treating the laminate at 100 ~ 150 ℃.

The manufacturing method of artificial leather using the polyurethane residue according to the present invention has a low plasticity, and thus, a cost required for the residue treatment by regenerating the polyurethane residue, which is difficult to recycle compared to polyurethane resin or rubber, to artificial leather by a wet process or a dry process. It has the effect of greatly reducing the cost.

In addition, the manufacturing method of artificial leather using the polyurethane residue of the present invention is simple in the case of manufacturing artificial leather by a dry process using no solvent, has the effect of protecting the health and environment of workers.

The present invention recycles the polyurethane residue remaining in the bobbin to produce artificial leather, recovering the polyurethane residue and mixing with a solvent and heating to a constant temperature in the order to form a recycled polyurethane resin, the recycled polyurethane resin A polyurethane resin composition comprising a polyester polyurethane copolymer resin, a solvent, and a pigment coated on a surface of a fabric to form a laminate, and solidifying the laminate to a coagulating solution and washing with water to dry the artificial leather, And recovering the polyurethane residue and mixing with a water-soluble acrylic resin melt or a water-soluble polyurethane melt not a solvent to form a polymer composition, coating the polymer composition on the surface of the fabric to form a laminate, and washing the laminate with water. Provides a method of dry manufacturing artificial leather by heat treatment at a constant temperature without It is technical idea to do.

With reference to Examples, the manufacturing method of the regenerated polyurethane resin for artificial leather is demonstrated in detail.

First, the method for producing a recycled polyurethane resin for artificial leather of the present invention includes the steps of recovering and cutting and shredding the polyurethane residue remaining in the bobbin to form a polyurethane residue powder.

When weaving a polyurethane fabric, after weaving the fabric by feeding the polyurethane yarn wound on the bobbin to the loom, about 3 to 6% by weight of the bobbin is caused by some reasons such as tension problems between the polyurethane yarn and the loom. Polyurethane yarn will remain as a residue.

Recovering the polyurethane residue remaining in the bobbin as described above is used in the production of regenerated polyurethane resin which is an intermediate material of artificial leather, the polyurethane residue recovered from the bobbin to uniformly disperse the polyurethane residue in the polyurethane residue solution Finely divided and crushed to form a polyurethane residue powder, and to produce a recycled polyurethane resin using the polyurethane residue powder.

In addition, the method for producing a regenerated polyurethane resin for artificial leather of the present invention is dimethylformamide and / or in the residue dissolving solvent or dimethylacetamide using only 10 to 50% by weight of the polyurethane residue powder, dimethylacetamide alone Mixing 50 to 90% by weight of a solvent for residue dissolution formed by mixing methyl ethyl ketone to form a polyurethane residue solution.

Specifically, a residue dissolving solvent comprising 10 to 50% by weight of polyurethane residue powder, a residue dissolving solvent using dimethylacetamide alone, or at least one solvent of dimethylformamide and methyl ethyl ketone in dimethylacetamide 50-90 wt% is mixed and uniformly stirred to form a polyurethane residue solution which is an intermediate material for producing a recycled polyurethane resin.

In order to quickly and easily dissolve the polyurethane residue powder obtained by pulverizing the polyurethane residue, dimethylacetamide having excellent solubility in polyurethane must be used as the solvent for dissolving the residue, and dimethylacetamide alone is used to dissolve the residue. Solvent is formed or dimethyl acetamide is mixed with at least one solvent of dimethylformamide and methyl ethyl ketone to form a solvent for residue dissolution.

When the content of the solvent for dissolving the residue contained in the polyurethane residue solution is less than 50% by weight in order to prepare the recycled polyurethane resin, the polyurethane residue is not sufficiently dissolved in the solvent for dissolving the residue. When the content of the solvent for dissolving the residue exceeds 90% by weight, the mechanical properties of the recycled polyurethane resin prepared from the polyurethane residue solution are greatly reduced due to the content of the solvent for dissolving the residue.

In addition, the method for producing a recycled polyurethane resin for artificial leather of the present invention comprises the step of heating the polyurethane residue solution to 100 ~ 150 ℃ in the order state to form a recycled polyurethane resin.

Specifically, a polyurethane residue solution consisting of a polyurethane residue and a solvent is heated to 100 to 150 ° C. for 23 to 25 hours in order to form a regenerated polyurethane resin, but the heating step of the polyurethane residue solution ensures moisture. It is preferable to carry out by using a double reactor capable of heating the bath while blocking, so as to easily control the heating temperature of the polyurethane residue solution to stably thermally decompose the polyurethane residue pulverized product.

If the temperature of heating the polyurethane residue solution to a hot bath to form a recycled polyurethane resin is less than 100 ° C., the polyurethane residue pulverized product of the polyurethane residue solution may not be thermally decomposed, and the temperature of heating the polyurethane residue solution to 150 ° C. If exceeded, a phenomenon in which the polyurethane residue pulverized product of the polyurethane residue solution deteriorates due to high temperature occurs. In addition, if the time for heating the polyurethane residue solution to form a regenerated polyurethane resin is less than 23 hours, the polyurethane residue pulverized product of the polyurethane residue solution is not sufficiently thermally decomposed, and the time for heating the polyurethane residue solution to a bath is If the time exceeds 25 hours, the pyrolysis of the polyurethane residue pulverization of the polyurethane residue solution is completed, so that further bath heating is meaningless.

In addition, the method for producing a recycled polyurethane resin for artificial leather of the present invention includes the step of obtaining by cooling the recycled polyurethane resin.

The regenerated polyurethane resin formed by heating a polyurethane residue solution composed of a polyurethane residue pulverized product and a solvent as described above is cooled by cold air to produce a recycled polyurethane resin for artificial leather.

The artificial leather can be constructed by recycling the manufactured polyurethane resin for artificial leather.

The method for wet-making artificial leather using the recycled polyurethane resin comprised as mentioned above is demonstrated in detail with reference to an Example.

First, the method for producing artificial leather using the polyurethane residue of the present invention is 50 to 90 parts by weight of regenerated polyurethane resin for artificial leather, the polyurethane residue is regenerated, 10 to 50 parts by weight of polyester polyurethane copolymer resin, dimethylacetamide A polyurethane resin composition is prepared by mixing 30 to 70 parts by weight of a solvent for dissolving a resin and 5 to 10 parts by weight of a pigment for dissolving a solvent for dissolving dimethyl acetamide or dimethyl formamide and / or methyl ethyl ketone. Forming.

Specifically, 50 to 90 parts by weight of a recycled polyurethane resin formed by regenerating a polyurethane residue, 10 to 50 polyester polyurethane copolymer resins for improving physical properties such as elongation and tensile strength of artificial leather produced from the recycled polyurethane resin 30 parts by weight to 30 parts by weight of a solvent for dissolving a resin in which dimethyl acetamide is used alone or a solvent for dissolving dimethyl acetamide in at least one solvent of dimethyl formamide and methyl ethyl ketone, and color to artificial leather. 5 to 10 parts by weight of the pigment to provide a mixture and stirred uniformly to form a polyurethane resin composition.

When the content of the polyester urethane copolymer resin mixed in 50 to 90 parts by weight of the recycled polyurethane resin to form the polyurethane resin composition is less than 10 parts by weight, the elongation, tensile strength, etc. of the artificial leather produced from the recycled polyurethane resin It cannot be expected to improve the physical properties, and if the content of the polyester polyurethane copolymer resin mixed in 50 to 90 parts by weight of the recycled polyurethane resin exceeds 50 parts by weight, the polyurethane residue is formed by recycling the polyurethane residue due to the relative decrease in the content of the recycled polyurethane resin. It is difficult to achieve the object of the present invention to provide artificial leather. In addition, when the content of the solvent for dissolving the resin mixed with 50 to 90 parts by weight of the recycled polyurethane resin to form a polyurethane resin composition is less than 30 parts by weight, the recycled polyurethane resin is not properly dissolved in the solvent for dissolving the resin, When the content of the solvent for dissolving the resin mixed with 50 to 90 parts by weight of the recycled polyurethane resin exceeds 70 parts by weight, the content of the solvent for dissolving the resin is excessive, such as the elongation and tensile strength of the artificial leather manufactured from the polyurethane resin composition. Physical properties are lowered. In addition, when the content of the pigment mixed in 50 to 90 parts by weight of the recycled polyurethane resin is less than 5 parts by weight in order to form the polyurethane resin composition, the content of the pigment is insufficient so that the color of the artificial leather manufactured from the polyurethane resin composition If it is not properly expressed and the content of the pigment mixed in 50 to 90 parts by weight of the recycled polyurethane resin exceeds 10 parts by weight, the production cost of the artificial leather produced from the polyurethane resin composition is increased due to the excessive content of the pigment, and the elongation and tension Physical properties, such as strength, fall.

In addition, the manufacturing method of artificial leather using the polyurethane residue of the present invention includes the step of forming a laminate in which the polyurethane resin coating layer is laminated by applying the polyurethane resin composition on the surface of the fabric.

The polyurethane resin composition is coated on one surface or both surfaces of the fabric with a predetermined thickness to form a laminate comprising the fabric and the polyurethane resin coating layer.

As described above, the polyurethane resin coating layer of the laminate composed of the fabric and the polyurethane resin coating layer is wet-solidified to form artificial leather.

In addition, the manufacturing method of artificial leather using the polyurethane residue of the present invention comprises the step of adding the laminate to the coagulation liquid mixed with dimethylformamide and / or methyl ethyl ketone in water to solidify the polyurethane resin coating layer. .

A laminate comprising a fabric and a polyurethane resin coating layer is added to a coagulation solution to wet-solidify the polyurethane resin coating layer to form a laminate having an artificial leather form.

As described above, the coagulating solution for wet coagulating the polyurethane resin coating layer of the laminate is constituted by mixing at least one of dimethylformamide and methyl ethyl ketone which are solvents of polyurethane in water. Then, by controlling the content of dimethylformamide or methyl ethyl ketone in the coagulation solution, the physical properties of the artificial leather constituted from the laminate can be arbitrarily controlled.

In addition, the manufacturing method of artificial leather using the polyurethane residue of the present invention includes the step of washing the laminate solidified with the polyurethane resin coating layer washed with water.

The polyurethane resin coating layer is solidified on at least one surface, and the artificial leather-like laminate is washed with water, and the washed laminate is naturally dried or dried by hot air at a constant temperature. Manufacture leather.

The manufacturing method of artificial leather using the polyurethane residue as described above is less plastic and recycles the polyurethane residue, which is difficult to recycle than polyurethane resin or rubber, and recycles it into artificial leather to protect the environment and to process the residue. Can greatly reduce the

On the contrary, with reference to another embodiment, it will be described in detail with respect to a method for dry manufacturing artificial leather using the polyurethane residue of the present invention.

First, the dry manufacturing method of artificial leather using the polyurethane residue of the present invention includes the step of recovering and cutting and shredding the polyurethane residue remaining in the bobbin to form a polyurethane residue powder.

Recover the polyurethane residue remaining in the bobbin is used for dry manufacturing of artificial leather, finely cut and shredded polyurethane residue recovered from the bobbin so that the polyurethane residue is uniformly dispersed in the artificial leather, the polymer composition of the intermediate material A polyurethane residue powder is formed, and artificial leather is manufactured using the polyurethane residue powder.

In addition, the dry manufacturing method of artificial leather using the polyurethane residue of the present invention is mixed with 10 to 15 parts by weight of the polyurethane residue powder, 70 to 80 parts by weight of water-soluble acrylic resin melt or water-soluble polyurethane melt and 2 to 4 parts by weight of thickener. To form a polymer composition.

In the present embodiment, the polyurethane residue powder is not dissolved in a solvent, but the polyurethane residue powder is mixed with a melt of acrylic resin, which is an artificial leather material, to form a polymer composition that is an intermediate material of artificial leather.

Specifically, by the dry process of mixing and stirring 10 to 15 parts by weight of the polyurethane residue powder, 70 to 80 parts by weight of the water-soluble acrylic resin or water-soluble polyurethane melt formed by melting the water-soluble acrylic resin and 2 to 4 parts by weight of the thickener. A solvent-free polymer composition is formed, wherein the polyurethane residue powder is uniformly dispersed and melted in the water-soluble polyurethane melt.

When the content of the polyurethane residue powder contained in the polymer composition containing 70 to 80 parts by weight of the water-soluble acrylic resin melt or the water-soluble polyurethane melt, which is the largest component, is less than 10 parts by weight, the relative content of the polyurethane residue powder is lowered. It will not be possible to achieve the object of the present invention to provide an artificial leather produced by recycling, if the content of the polyurethane residue powder contained in the polymer composition exceeds 15 parts by weight mechanical properties of the artificial leather manufactured using the polymer composition Is lowered. In addition, when the content of the thickener contained in the polymer composition containing 70 to 80 parts by weight of the water-soluble acrylic resin melt or the water-soluble polyurethane melt as the largest component is less than 2 parts by weight, the elongation and tensile strength of the artificial leather manufactured using the polymer composition. When mechanical properties such as the lowering, the content of the thickener contained in the polymer composition exceeds 4 parts by weight, the polyurethane residue powder is not uniformly dispersed in the polymer composition due to the excessive content of the thickener.

Artificial leather can be constructed using the polymer composition as described above as an intermediate material.

In addition, the dry manufacturing method of artificial leather using the polyurethane residue of the present invention includes the step of forming a laminate by applying the polymer composition on the surface of the fabric.

The polymer composition is coated on one surface or both surfaces of a fabric such as a nonwoven fabric with a predetermined thickness to form a laminate comprising the fabric and a synthetic resin coating layer.

As described above, the synthetic resin coating layer of the laminate composed of the fabric and the synthetic resin coating layer is solidified to form artificial leather.

In addition, the dry manufacturing method of artificial leather using the polyurethane residue of the present invention includes the step of heat-treating the laminate at 100 ~ 150 ℃.

In the present invention, the artificial leather is formed by injecting a laminate composed of a fabric and a synthetic resin coating layer into a coagulating solution to wet-solidify the synthetic resin coating layer to form an artificial leather, but by heat treating the laminate to solidify the synthetic resin coating layer.

Specifically, the artificial body is manufactured by heat-treating at 100 to 150 ° C. by placing a laminate composed of a fabric and a synthetic resin coating layer in an oven or by applying hot air. If the temperature for heat treating the laminate to produce artificial leather is less than 100 ℃ the laminate is not properly dried and settled, if the temperature for heat treatment of the laminate exceeds 150 ℃ artificial heat produced from the laminate due to excessive heat treatment temperature The phenomenon of leather deterioration occurs.

In the dry manufacturing method of artificial leather using the polyurethane residue described above, the regeneration method of the polyurethane residue is recycled to artificial leather by recycling the polyurethane residue, which is less plastic and difficult to recycle than polyurethane resin or rubber. Significantly reduce the cost of treatment, and artificial leather is manufactured by a dry process that does not use a solvent, the process is simple and can prevent workers' health deterioration and environmental damage caused by the solvent.

Hereinafter, with reference to a preferred embodiment, it will be described in detail with respect to dry manufacturing method of artificial leather using the polyurethane residue of the present invention. However, the following examples are only for illustrating the present invention in detail, and do not limit the present invention, the present invention is limited only by the claims.

<Examples>

1. The polyurethane residue remaining in the bobbin was recovered and crushed to form a polyurethane residue powder.

2. 12 parts by weight of the polyurethane residue powder, 74 parts by weight of a water-soluble acrylic resin (manufactured by Unitech Co., Ltd., model name UT-5025) melt, and 2 parts by weight of a thickener (Unitech Co., Ltd.) were mixed and stirred to form a polymer composition.

3. The polymer composition was applied to one surface of a nonwoven fabric, which is a fabric, with a thickness of 0.3 mm to form a laminate.

4. The laminate was placed in an oven, heat treated at 130 ° C. for 1 hour, and then cooled naturally for 30 minutes to prepare artificial leather.

<Comparative Example>

The polyurethane residue remaining in the bobbin is recovered and cut and broken to form a polyurethane residue shredder having a length of 1.0 mm, and the polymer composition is mixed by 5 parts by weight of the polyurethane residue shredder, 94 parts by weight of a water-soluble acrylic resin melt, and 1 part by weight of a thickener. Except for forming the same as in the above embodiment.

Experimental Example

Each artificial leather manufactured by the above Examples and Comparative Examples and a nonwoven fabric which is a substrate of the artificial leather were prepared as samples according to KS M 6518 standard, and each sample was prepared by a universal material tester (model name HUC-CM2-169). Elongation and tensile strength were measured while moving at a speed of 200 m / min), and the measurement results are shown in Table 1 below.

division Example Comparative example Non-woven Shinto (%) 45 38 40 Tensile Strength (㎏f / ㎠) 0.42 0.40 0.32

In Table 1, the artificial leather according to the example was superior to the artificial leather and the nonwoven fabric of the comparative example, and was found to be suitable as a practical artificial leather.

Claims (4)

Recovering and cutting and crushing the polyurethane residue remaining in the bobbin to form a polyurethane residue powder;
10-50% by weight of the polyurethane residue powder, a solvent for residue dissolving using dimethylacetamide alone or 50-90% by weight of solvent for dissolving residue obtained by mixing dimethylformamide and / or methylethylketone with dimethylacetamide Mixing to form a polyurethane residue solution;
Heating the polyurethane residue solution at a temperature of 100 to 150 ° C. to form a recycled polyurethane resin; And
Method for producing a recycled polyurethane resin for artificial leather comprising the step of obtaining by cooling the recycled polyurethane resin. The method of claim 1, wherein the forming of the recycled polyurethane resin is performed for 23 to 25 hours. Dimethylformamide and / or 50 to 90 parts by weight of the regenerated polyurethane resin for artificial leather according to claim 1, 10 to 50 parts by weight of polyester urethane copolymer resin, a resin dissolving solvent or dimethylacetamide using dimethylacetamide alone. Or mixing 30 to 70 parts by weight of a solvent for dissolving a resin obtained by mixing methyl ethyl ketone, and 5 to 10 parts by weight of a pigment to form a polyurethane resin composition;
Coating the polyurethane resin composition on a surface of a fabric to form a laminate in which a polyurethane resin coating layer is laminated;
Solidifying the polyurethane resin coating layer by introducing the laminate into a coagulation solution in which dimethylformamide and / or methyl ethyl ketone are mixed in water; And
Method of manufacturing artificial leather using a polyurethane residue comprising the step of washing the laminate solidified with the polyurethane resin coating layer washed with water. Recovering and cutting and crushing the polyurethane residue remaining in the bobbin to form a polyurethane residue powder;
Forming a polymer composition by mixing 10-15 parts by weight of the polyurethane residue powder, 70-80 parts by weight of a water-soluble acrylic resin melt or a water-soluble polyurethane melt, and 2-4 parts by weight of a thickener;
Applying the polymer composition to a surface of a fabric to form a laminate; And
Method of manufacturing artificial leather using a polyurethane residue comprising the step of heat-treating the laminate at 100 ~ 150 ℃.