KR20230022620A - Manufacturing method of synthetic leather from recycled EVA foam - Google Patents
Manufacturing method of synthetic leather from recycled EVA foam Download PDFInfo
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- KR20230022620A KR20230022620A KR1020210104610A KR20210104610A KR20230022620A KR 20230022620 A KR20230022620 A KR 20230022620A KR 1020210104610 A KR1020210104610 A KR 1020210104610A KR 20210104610 A KR20210104610 A KR 20210104610A KR 20230022620 A KR20230022620 A KR 20230022620A
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- 239000006260 foam Substances 0.000 title claims abstract description 47
- 239000002649 leather substitute Substances 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 91
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 91
- 239000002699 waste material Substances 0.000 claims abstract description 86
- 239000011248 coating agent Substances 0.000 claims abstract description 35
- 238000000576 coating method Methods 0.000 claims abstract description 35
- 239000004744 fabric Substances 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 17
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000010298 pulverizing process Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 12
- 238000004064 recycling Methods 0.000 claims description 11
- 230000032683 aging Effects 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000003475 lamination Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 abstract description 11
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 238000007906 compression Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 6
- 229920003002 synthetic resin Polymers 0.000 description 5
- 239000000057 synthetic resin Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 150000002013 dioxins Chemical class 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000005556 hormone Substances 0.000 description 1
- 229940088597 hormone Drugs 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0061—Organic fillers or organic fibrous fillers, e.g. ground leather waste, wood bark, cork powder, vegetable flour; Other organic compounding ingredients; Post-treatment with organic compounds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
- D06N3/0077—Embossing; Pressing of the surface; Tumbling and crumbling; Cracking; Cooling; Heating, e.g. mirror finish
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
Description
본 발명은 폐 EVA폼을 재활용한 합성피혁의 제조방법에 관한 것으로, 보다 상세하게는 폐 EVA폼을 분쇄 및 처리를 통해 재활용이 가능하고, 이를 통해 기존에 폐 EVA폼을 처리하기 위한 비용 및 환경오염 문제를 절감시킬 수 있는 폐 EVA폼을 재활용한 합성피혁의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing synthetic leather by recycling waste EVA foam, and more particularly, it is possible to recycle waste EVA foam by crushing and treating it, thereby reducing the cost and environment for processing waste EVA foam. It relates to a method for manufacturing synthetic leather by recycling waste EVA foam that can reduce contamination problems.
일반적으로 합성수지폼은 흡음재, 차음재, 단열재, 쿠션재, 보도블럭 등의 여러가지 용도로 각종 산업분야에서 널리 사용되고 있다. 이러한 합성수지 폼으로 이루어진 제품은 그 쓸모를 다하고 폐기되는 과정에서 다량의 폐기물을 발생시킨다. 특히 폐 합성수지폼 조각은 폼 제품의 제조과정 즉, 합성수지 폼 제품을 발포 제조한 후 이를 각 용도에 맞게 적절한 크기 및 형상으로 절단하는 과정에서 조각 형태로 다량 발생된다. 이러한 폐 합성수지폼의 재생기술은 많이 개발되어있는 것에 비해 에틸렌바이닐아세테이트(ethylene-vinyl acetate copolymer, EVA)폼의 경우 재활용하는 기술이 거의 개발되지 않고 있다.In general, synthetic resin foam is widely used in various industrial fields for various purposes such as sound absorbing materials, sound insulating materials, heat insulating materials, cushion materials, and sidewalk blocks. Products made of these synthetic resin foams generate a large amount of waste in the process of being used up and discarded. In particular, waste synthetic resin foam pieces are generated in large quantities in the form of pieces during the manufacturing process of foam products, that is, during the process of foaming and manufacturing synthetic resin foam products and then cutting them into appropriate sizes and shapes for each purpose. While many technologies for recycling waste synthetic resin foam have been developed, technologies for recycling ethylene-vinyl acetate copolymer (EVA) foam have not been developed.
이에 의해 EVA폼을 처리하는 방법으로는 매립이나 소각에 그치게 되는데, 이는 폐기시키는데 많은 비용이 소요될 뿐 아니라 환경을 오염시킨다는 문제점이 있다. 상세하게는 발포된 EVA폼은 단위질량당 부피가 매우 커서 매립이나 소각에 어려움이 많으며, 매립이나 소각처리는 부지나 시설에 제한이 따르고, 다이옥신 등의 인체에 유해한 환경호르몬, 악취 또는 유해가스 등을 발생시켜 환경오염을 일으킨다는 문제점이 있다.As a result, the method of treating the EVA foam is limited to landfill or incineration, which has a problem that it not only takes a lot of money to dispose of, but also pollutes the environment. In detail, the foamed EVA foam has a very large volume per unit mass, so it is difficult to landfill or incinerate. Landfill or incineration is subject to restrictions on site or facility, environmental hormones harmful to the human body such as dioxins, odors or harmful gases, etc. There is a problem that causes environmental pollution by generating.
따라서 이러한 폐 EVA폼 발생 자체를 줄이는 것이 최선이나, 일단 발생된 폐 EVA 폼의 경우 이를 재활용하는 것이 중요한 과제로 대두되고 있다. 특히 폐 EVA폼을 재활용하여 신발의 갑피, 건축의 내장재, 인테리어용 등 다양한 분야에 적용 가능한 기술이 필요한 실정이다.Therefore, it is best to reduce the generation of such waste EVA foam itself, but in the case of waste EVA foam once generated, recycling it has emerged as an important task. In particular, there is a need for a technology that can be applied to various fields such as uppers of shoes, interior materials of buildings, and interiors by recycling waste EVA foam.
본 발명은 상기와 같은 문제점을 해결하기 위해 안출된 것으로, 보다 상세하게는 폐 EVA폼을 분쇄 및 처리를 통해 재활용이 가능하고, 이를 통해 기존에 폐 EVA폼을 처리하기 위한 비용 및 환경오염 문제를 절감시킬 수 있는 폐 EVA폼을 재활용한 합성피혁의 제조방법을 제공하는 것이다.The present invention has been made to solve the above problems, and more specifically, it is possible to recycle waste EVA foam through crushing and processing, and through this, the cost and environmental pollution problems of conventional waste EVA foam processing are reduced. It is to provide a manufacturing method of synthetic leather recycling waste EVA foam that can be reduced.
상기한 목적은, 폐 EVA(ethylene-vinyl acetate copolymer)폼을 폭과 높이가 3cm 이하가 되도록 폐 EVA조각으로 컷팅하는 조분쇄단계; 조분쇄된 상기 폐 EVA조각을 300㎛ 이하가 되도록 폐 EVA분말로 분쇄하는 미분쇄단계; 및 상기 폐 EVA분말과 용액형 폴리우레탄수지를 배합하여 복합 코팅액을 제조하고, 상기 복합 코팅액을 원단 일면에 코팅하여 합성피혁을 제조하는 합성피혁 제조단계;를 포함하는 것을 특징으로 하는 폐 EVA폼을 재활용한 합성피혁의 제조방법에 의해서 달성된다.The above object is a coarse pulverization step of cutting the waste EVA (ethylene-vinyl acetate copolymer) foam into waste EVA pieces such that the width and height are less than 3 cm; A pulverization step of pulverizing the coarsely pulverized waste EVA pieces into waste EVA powder to a size of 300 μm or less; and a synthetic leather manufacturing step of preparing a composite coating solution by mixing the waste EVA powder and a solution-type polyurethane resin, and coating the composite coating solution on one surface of a fabric to produce synthetic leather. It is achieved by a manufacturing method of recycled synthetic leather.
여기서, 상기 미분쇄단계 이후에, 미분쇄된 상기 폐 EVA분말을 거름체를 이용하여 걸러 여러 사이즈로 분류하는 거름단계;를 더 포함하는 것이 바람직하다.Here, after the pulverization step, it is preferable to further include a sieve step of filtering the pulverized waste EVA powder using a sieve and classifying it into various sizes.
또한, 상기 합성피혁 제조단계는, 미분쇄된 상기 폐 EVA분말과 상기 용액형 폴리우레탄 수지가 배합된 상기 복합 코팅액을 1차 민자 이형지의 일면에 도포하는 코팅액 도포단계; 상기 1차 민자 이형지의 일면에 도포된 상기 복합 코팅액의 상부에 상기 원단을 가압착하여 상기 1차 민자 이형지와 상기 원단을 합지시키는 가압착 1차합지단계; 상기 1차 민자 이형지로부터 합지된 상기 원단을 분리하고, 분리된 상기 원단을 2차 패턴 이형지의 일면에 압착하여 합지하는 2차합지단계; 및 합지된 상기 2차 패턴 이형지와 원단을 숙성시키고, 상기 2차 패턴 이형지로부터 합지된 상기 원단을 분리하여 합성피혁을 제조하는 숙성 및 분리단계를 포함하는 것이 바람직하다.In addition, the synthetic leather manufacturing step may include a coating liquid application step of applying the composite coating liquid in which the pulverized waste EVA powder and the solution type polyurethane resin are mixed to one side of a primary private release paper; A first pressure bonding step of bonding the first private release paper and the fabric by pressing the fabric on top of the composite coating liquid applied to one side of the first private release paper; A secondary lamination step of separating the laminated fabric from the primary private release paper and pressing and bonding the separated fabric to one side of the secondary pattern release paper; and an aging and separation step of aging the laminated fabric with the secondary pattern release paper and separating the laminated fabric from the secondary pattern release paper to manufacture synthetic leather.
상술한 바와 같이 본 발명에 따르면, 폐 EVA폼을 분쇄 및 처리를 통해 재활용이 가능하고, 이를 통해 기존에 폐 EVA폼을 처리하기 위한 비용 및 환경오염 문제를 절감시킬 수 있는 효과를 얻을 수 있다.As described above, according to the present invention, the waste EVA foam can be recycled through crushing and processing, and through this, it is possible to obtain an effect of reducing the cost and environmental pollution problems of conventional waste EVA foam treatment.
도 1 및 도 2는 본 발명의 실시예에 따른 폐 EVA폼을 재활용한 합성피혁의 제조방법의 순서도이고,
도 3은 본 발명을 통해 제조된 합성피혁의 사진이다.1 and 2 are flowcharts of a method for manufacturing synthetic leather using waste EVA foam according to an embodiment of the present invention;
3 is a photograph of synthetic leather produced through the present invention.
이하, 본 발명의 기술적 사상을 첨부된 도면을 사용하여 더욱 구체적으로 설명한다. 첨부된 도면은 본 발명의 기술적 사상을 더욱 구체적으로 설명하기 위하여 도시한 일예에 불과하므로 본 발명의 기술적 사상이 첨부된 도면의 형태에 한정되는 것은 아니다.Hereinafter, the technical spirit of the present invention will be described in more detail using the accompanying drawings. Since the accompanying drawings are only examples shown to explain the technical idea of the present invention in more detail, the technical idea of the present invention is not limited to the form of the accompanying drawings.
도 1 및 도 2는 본 발명의 실시예에 따른 폐 EVA폼을 재활용한 합성피혁의 제조방법의 순서도이고, 도 3은 본 발명을 통해 제조된 합성피혁의 사진이다.1 and 2 are flowcharts of a method for manufacturing synthetic leather using waste EVA foam according to an embodiment of the present invention, and FIG. 3 is a photograph of synthetic leather manufactured according to the present invention.
본 발명에 따른 폐 EVA폼을 재활용한 합성피혁의 제조방법은, 도 1에 도시된 바와 같이 조분쇄단계(S100), 미분쇄단계(S200), 거름 단계(S300) 및 합성피혁 제조단계(S400)를 포함한다.As shown in FIG. 1, the method for manufacturing synthetic leather by recycling waste EVA foam according to the present invention includes a coarse grinding step (S100), a fine grinding step (S200), a filtering step (S300), and a synthetic leather manufacturing step (S400). ).
먼저 조분쇄단계(S100)는, 폐 EVA폼을 폭과 높이가 3cm 이하가 되도록 폐 EVA조각으로 컷팅하는 단계를 의미한다. First, the coarsely crushing step (S100) means a step of cutting the waste EVA foam into waste EVA pieces such that the width and height are 3 cm or less.
신발 미드솔, 포장재 또는 건축 내장재 등에서 발생하는 폐 EVA(ethylene-vinyl acetate copolymer)폼은 그대로 재활용 하기에는 큰 사이즈로 이루어져 있기 때문에, 이를 재활용 하기 위해서는 폭과 높이가 3cm 이하가 되는 직육면체 형태의 폐 EVA 조각으로 컷팅하는 조분쇄단계(S100)가 이루어진다. 즉, 폐 EVA폼을 바로 미세한 사이즈로 분쇄할 수는 없기 때문에 전처리하는 과정에 해당한다.Waste EVA (ethylene-vinyl acetate copolymer) foam generated from shoe midsoles, packaging materials, or building interior materials is too large to be recycled as it is. A coarse grinding step (S100) of cutting is performed. That is, since the waste EVA foam cannot be immediately pulverized into a fine size, it corresponds to a pretreatment process.
여기서 폐 EVA폼은 밀도가 0.2g/㎤ 이상 및 경도가 50 이상으로 이루어진 것을 재활용하는 것이 바람직하다. 만약 폐 EVA폼의 밀도가 0.2g/㎤ 미만일 경우 조분쇄단계(S100) 및 후술할 미분쇄단계(S200)에서 폐 EVA폼 및 폐 EVA조각이 열로 인해서 녹았다가 뭉쳐서 원하는 EVA분말을 얻을 수 없다는 문제점이 있으며, 경도가 50 미만일 경우 미분쇄단계(S200) 자체가 원활하게 일어나지 않고 입자 사이즈가 균일하지 못한 폐 EVA분말을 얻게 된다.Here, it is preferable to recycle the waste EVA foam having a density of 0.2 g/cm 3 or more and a hardness of 50 or more. If the density of the waste EVA foam is less than 0.2 g / cm3, the waste EVA foam and the waste EVA pieces are melted and agglomerated due to heat in the coarse grinding step (S100) and the fine grinding step (S200 to be described later). There is a problem, and if the hardness is less than 50, the pulverization step (S200) itself does not occur smoothly, and waste EVA powder having a non-uniform particle size is obtained.
미분쇄단계(S200)는, 조분쇄된 폐 EVA조각을 300㎛ 이하가 되도록 폐 EVA분말로 분쇄하는 단계를 의미한다.The pulverization step (S200) means a step of pulverizing the coarsely pulverized waste EVA pieces into waste EVA powder to be 300 μm or less.
조분쇄단계(S200)를 통해 3cm 이하로 사이즈를 감소시킨 폐 EVA조각을 300㎛ 이하가 되도록 폐 EVA분말로 추가로 미분쇄하는 과정을 거치게 된다. 이와 같이 폐 EVA조각을 잘게 미분쇄하여 폐 EVA분말로 형성한 후, 후술할 단계들을 통해 합성피혁을 제조가능하다. 즉, 3cm 이하의 폐 EVA조각으로는 합성피혁을 성형할 수 없으므로, 추가로 폐 EVA분말로 미분쇄하는 과정을 거치게 된다. 여기서 폐 EVA조각은 300㎛ 이하가 되도록 미분쇄하는데, 만약 폐 EVA분말이 300㎛를 초과할 경우 균일한 표면을 가지는 합성피혁을 제조할 수 없다는 문제점이 있다. 경우에 따라서 더 얇은 두께를 가지는 합성피혁을 제조해야 할 경우, 폐 EVA분말은 150㎛ 이하로 미분쇄될 수도 있다.The waste EVA pieces, the size of which has been reduced to 3 cm or less through the coarse grinding step (S200), are further pulverized into waste EVA powder to be 300 μm or less. In this way, after finely pulverizing waste EVA pieces to form waste EVA powder, synthetic leather can be manufactured through the steps to be described later. That is, since synthetic leather cannot be molded with waste EVA pieces of 3 cm or less, it is additionally subjected to a process of finely pulverizing waste EVA powder. Here, the waste EVA pieces are pulverized to be 300 μm or less, but if the waste EVA powder exceeds 300 μm, there is a problem in that synthetic leather having a uniform surface cannot be manufactured. In some cases, when synthetic leather having a thinner thickness is to be manufactured, the waste EVA powder may be pulverized to 150 μm or less.
이와 같이 폐 EVA조각을 미분쇄하는 방법으로는 미분쇄회전체에 폐 EVA조각을 투입한 후 내부 온도가 150° 이하가 되도록 세팅하고, 미분쇄회전체를 회전시켜 원심력과 구심력을 이용하여 폐 EVA조각을 미분쇄한다. 이때 폐 EVA조각이 미분쇄됨에 의해 발열이 일어나게 되는데, 이로 인해 미분쇄회전체의 내부 온도가 증가하는 것을 방지하기 위해 내부 온도가 150° 이하로 유지되도록 미분쇄회전체와 연결된 배관을 통해 공랭식으로 내부 온도를 낮추도록 구성된다. 만약 미분쇄 단계가 150°를 초과하는 온도에서 이루어질 경우 미립화된 폐 EVA입자가 다시 녹아 뭉치는 현상이 일어나기 때문에 폐 EVA분말의 입자 사이즈 컨트롤이 어렵다는 문제점이 있다.In this way, as a method of pulverizing the waste EVA pieces, the waste EVA pieces are put into the pulverized rotating body, set so that the internal temperature is 150° or less, and then the pulverized rotating body is rotated to use the centrifugal and centripetal force. Crush the pieces. At this time, heat is generated by the pulverization of the waste EVA pieces. In order to prevent the internal temperature of the pulverized rotating body from increasing due to this, air-cooling is performed through a pipe connected to the pulverizing rotating body so that the internal temperature is maintained below 150°. It is configured to lower the internal temperature. If the pulverization step is performed at a temperature exceeding 150°, there is a problem in that it is difficult to control the particle size of the waste EVA powder because the atomized waste EVA particles melt again and agglomerate.
여기서 폐 EVA폼의 밀도가 0.3g/㎤ 이상일 경우 공압 6kgf/cm를 이용하여 추가로 공랭식으로 냉각시키는 것이 바람직하다. 이는 0.3g/㎤ 이상의 밀도에서는 질소를 투입하거나 저온 냉장고를 이용하여 미분쇄단계(S200)를 거치기 전 폐 EVA조각을 -20℃ 내지 -50℃로 냉각시킨 후 투입하여 미분쇄회전체의 내부 온도 상승 방지 및 폐 EAV조각의 분쇄를 더욱 용이하게 한다.Here, when the density of the waste EVA foam is 0.3 g/cm 3 or more, it is preferable to additionally cool it by air-cooling using an air pressure of 6 kgf/cm. At a density of 0.3 g/cm or more, nitrogen is injected or a low-temperature refrigerator is used to cool the waste EVA pieces before going through the pulverization step (S200) to -20 ° C to -50 ° C, and then put them to the internal temperature of the pulverized rotating body. Elevation prevention and pulverization of waste EAV fragments are made easier.
거름단계(S300)는, 미분쇄된 폐 EVA분말을 거름체를 이용하여 걸러 여러 사이즈로 분류하는 단계를 의미한다.The sieving step (S300) means a step of sifting the pulverized waste EVA powder using a sieve and classifying it into various sizes.
폐 EVA분말의 경우 300㎛ 이하의 사이즈로 미분쇄되기는 하지만, 그 안에서도 다양한 사이즈의 폐 EVA분말이 형성될 수 있다. 이는 균일한 내부 및 표면을 가지는 합성피혁을 형성하는 데 방해가 되기 때문에, 경우에 따라서 폐 EVA분말을 여러 사이즈로 분류하기 위해 거름체를 이용하여 폐 EVA분말을 거르는 거름단계(S300)를 포함할 수도 있다. 또한 합성피혁의 용도에 따라서 특정 사이즈의 폐 EVA분말을 원하는 경우 이를 선택가능하도록 개별포장을 위해서도 거름단계(S300)가 추가될 수도 있다.In the case of waste EVA powder, although it is pulverized to a size of 300 μm or less, waste EVA powder of various sizes may be formed therein. Since this hinders the formation of synthetic leather having a uniform interior and surface, in some cases, a filtering step (S300) of filtering the waste EVA powder using a sieve to classify the waste EVA powder into various sizes may be included. may be In addition, a filtering step (S300) may be added for individual packaging so that waste EVA powder of a specific size can be selected according to the use of synthetic leather.
여기서 거름체(sieve)는 300㎛, 150㎛, 50㎛ 등과 같이 다양한 사이즈를 구비할 수 있으며, 해당 거름체들을 이용하여 연속적으로 거름단계(S300)를 수행한 후 여러 사이즈로 분류된 폐 EVA분말을 각각 포장 및 보관하게 된다.Here, the sieve may have various sizes such as 300 μm, 150 μm, 50 μm, etc., and the waste EVA powder classified into various sizes after continuously performing the sieving step (S300) using the sieve are individually packaged and stored.
합성피혁 제조단계(S400)는, 폐 EVA분말과 용액형 폴리우레탄 수지를 배합하여 복합 코팅액을 제조하고, 복합 코팅액을 원단 일면에 코팅하여 합성피혁을 제조하는 단계를 의미한다. 이러한 합성피혁 제조단계(S400)는, 코팅액 도포단계(S410), 가압착 1차합지단계(S420), 2차합지단계(S430), 숙성 및 분리단계(S440)를 포함한다.The synthetic leather manufacturing step (S400) means a step of preparing a composite coating solution by mixing waste EVA powder and a solution-type polyurethane resin, and coating the composite coating solution on one side of the fabric to produce synthetic leather. The synthetic leather manufacturing step (S400) includes a coating liquid application step (S410), a first pressure bonding step (S420), a second bonding step (S430), and an aging and separation step (S440).
코팅액 도포단계(S410)는, 미분쇄된 폐 EVA분말과 용액형 폴리우레탄 수지가 배합된 복합 코팅액을 1차 민자 이형지의 일면에 도포하는 단계를 의미한다. 여기서 용액형 폴리우레탄 수지의 경우, 1액형 폴리우레탄 수지와 2액형 폴리우레탄 수지의 장점을 융합한 1.5액형 폴리우레탄 수지를 사용하는 것이 바람직하다. 1.5액형 폴리우레탄 수지의 경우 1액형 및 2액형의 장점이 융합됨은 물론, 특유의 유연성과 강인성을 모두 갖는 고분자 구조로, 우수한 내구성 및 기계적 물성을 부여할 수 있다. 이러한 1.5액형 폴리우레탄 수지에 폐 EVA분말을 첨가하여 혼합한 복합 코팅액을 형성하고, 형성된 복합 코팅액을 1차 민자 이형지의 일면에 도포한다. 여기서 1차 민자 이형지는 표면이 민무늬로 이루어진 이형지를 의미한다.The coating solution application step (S410) means a step of applying a composite coating solution in which the pulverized waste EVA powder and the solution-type polyurethane resin are mixed to one side of the primary private release paper. In the case of the solution-type polyurethane resin, it is preferable to use a 1.5-component polyurethane resin that combines the advantages of a one-component polyurethane resin and a two-component polyurethane resin. In the case of the 1.5-component polyurethane resin, the advantages of the one-component and two-component polyurethane resins are fused, as well as the polymer structure having both unique flexibility and toughness, which can impart excellent durability and mechanical properties. Waste EVA powder is added to this 1.5-component polyurethane resin to form a mixed composite coating solution, and the formed composite coating solution is applied to one side of the primary private release paper. Here, the primary private release paper means a release paper with a plain surface.
가압착 합지단계(S420)는, 1차 민자 이형지의 일면에 도포된 복합 코팅액의 상부에 원단을 가압착하여 1차 민자 이형지와 원단을 합지시키는 단계를 의미한다. 이때 가압착은 접착과 점착의 중간 단계로 가압착하는 과정에 해당한다. 여기서 원단은 다수의 홀(hole)을 구비하는 원단을 의미하며, 가압착 합지단계(S420)를 통해 원단이 복합 코팅액 방향으로 하강하면서 맞닿도록 압착하여 1차로 합지된다. 홀을 구비한 원단은 복합 코팅액과 가압착되기 때문에 복합 코팅액이 원단의 면 부분에만 코팅되고, 홀 내부까지는 침투되지 않게 된다.The pressure bonding step (S420) means a step of bonding the primary private release paper and the fabric by pressurizing the fabric on top of the composite coating liquid applied to one side of the primary private release paper. At this time, the pre-compression is an intermediate step between adhesion and adhesion, and corresponds to the process of pre-compression. Here, the fabric means a fabric having a plurality of holes, and through the pressure bonding step (S420), the fabric is first laminated by compressing the fabric to come into contact while descending in the direction of the composite coating solution. Since the fabric having the hole is pre-compressed with the composite coating solution, the composite coating solution is coated only on the surface of the fabric and does not penetrate into the hole.
2차합지단계(S430)는, 1차 민자 이형지로부터 합지된 원단을 분리하고, 분리된 원단을 2차 패턴 이형지의 일면에 압착하여 합지하는 단계를 의미하며, 원단 분리시에는 1차 민자 이형지로부터 합지된 원단의 일면으로 복합 코팅액이 전사되어 분리됨을 특징으로 한다. 여기서 분리된 원단 및 2차 패턴 이형지를 합지할 때에는 복합 코팅액이 전사된 면이 2차 패턴 이형지의 일면과 마주보도록 압착되어 합지되는 것이 바람직하다. 이때 압착은 접착과 점착의 중간 단계였던 가압착보다는 접착에 가깝게 압력 및 형태가 유지되는 것이 바람직하다.The second lamination step (S430) refers to a step of separating the laminated fabric from the first private release paper, and pressing and laminating the separated fabric on one side of the second pattern release paper, and when separating the fabric from the first private release paper. It is characterized in that the composite coating liquid is transferred to one side of the laminated fabric and separated. When the separated fabric and the second pattern release paper are laminated, it is preferable that the surface on which the composite coating liquid is transferred faces one surface of the second pattern release paper and then laminated. At this time, it is preferable that pressure and shape are maintained closer to adhesion than temporary compression, which was an intermediate step between adhesion and adhesion.
2차 패턴 이형지와 원단을 압착할 때에는 망글머신(mangle machine)을 이용하여 망글압착이 이루어지게 된다. 여기서 망글머신은 두 개의 롤러로 원단을 압착하여 탈수하는 탈수기 형태로 이루어진다. 망글압착은 2차 패턴 이형지와 원단을 압착할 때 망글머신을 통과하여 압착시키는 방법에 해당하며, 이는 복합 코팅액을 경화하여 원단과의 접착성을 향상시키기 위해 진행된다. 이때 망글압착 조건은 망글머신 내의 온도가 80 내지 130℃로 이루어지며, 압착 시간은 130 내지 300초로 이루어지는 것이 바람직하나 이에 한정되지는 않는다. When the secondary pattern release paper and the fabric are compressed, the mangle compression is performed using a mangle machine. Here, the mangle machine is in the form of a dehydrator that compresses and dehydrates fabric with two rollers. Mangle compression corresponds to a method of compressing the second pattern release paper and fabric by passing through a mangle machine, which is performed to improve adhesion with the fabric by hardening the composite coating solution. At this time, the mangle pressing condition is that the temperature in the mangle machine is 80 to 130 ° C, and the compression time is preferably 130 to 300 seconds, but is not limited thereto.
숙성 및 분리단계(S440)는, 합지된 2차 패턴 이형지와 원단을 숙성시키고, 2차 패턴 이형지로부터 합지된 원단을 분리하여 합성피혁을 제조하는 단계를 의미하며, 분리시 2차 패턴 이형지의 일정 형태의 패턴이 전사되어 합성피혁에 낼 수 있는 패턴 효과가 구현될 수 있도록 한다. Aging and separation step (S440) means a step of aging the laminated secondary pattern release paper and fabric, and separating the laminated fabric from the secondary pattern release paper to manufacture synthetic leather, and the schedule of the secondary pattern release paper during separation The pattern of the shape is transferred so that the pattern effect that can be applied to the synthetic leather can be realized.
여기서 숙성 과정의 경우 80 내지 90℃의 조건에서 22 내지 26시간 숙성되는 것이 바람직하며, 이는 복합 코팅액의 경화성이 증대되고 합성피혁을 열화학적으로 안정화시켜 내구성을 향상시키기 위한 과정에 해당한다. 보다 상세하게는 80℃ 미만의 온도 조건에서 22시간 미만으로 숙성시킬 경우, 경화성 증대가 지연되어 복합 코팅액의 접착성이 현저히 저하되는 문제가 발생할 수 있다. 반면 90℃ 초과의 온도 조건에서 26시간 초과되어 숙성시킬 경우 급속한 경화반응으로 인하여 복합 코팅액 내 기포가 과다하게 발생될 수 있어, 생산성이 저하될 우려가 있다.Here, in the case of the aging process, it is preferable to age at 80 to 90 ° C. for 22 to 26 hours, which corresponds to a process for increasing the curability of the composite coating liquid and thermochemically stabilizing the synthetic leather to improve durability. More specifically, when aged for less than 22 hours at a temperature of less than 80 ° C., the increase in curability is delayed, and thus the adhesiveness of the composite coating solution may be significantly reduced. On the other hand, when aging exceeds 26 hours at a temperature of more than 90 ° C., excessive bubbles may be generated in the composite coating solution due to a rapid curing reaction, which may reduce productivity.
이와 같은 과정을 통해 최종으로 제조되는 합성피혁은 도 2 및 표 1을 통해 결과를 확인할 수 있다. 도 2에 도시된 바와 같이 폐 EVA폼의 색상에 따라 합성피혁에 패턴에 맞는 합성피혁을 얻을 수 있다. 또한 표 1은 사용되는 폐 EVA폼의 밀도와 경도에 따른 미립화 차이를 나타낸 것으로, 밀도가 0.2g/㎤ 이상 및 경도가 50 이상으로 이루어진 폐 EVA폼을 사용하는 것이 바람직함을 확인 가능하다.The synthetic leather finally manufactured through this process can confirm the results through FIG. 2 and Table 1. As shown in FIG. 2, synthetic leather matching a pattern to synthetic leather can be obtained according to the color of the waste EVA foam. In addition, Table 1 shows the difference in atomization according to the density and hardness of the used EVA foam, and it can be confirmed that it is preferable to use the waste EVA foam having a density of 0.2 g/cm3 or more and a hardness of 50 or more.
(g/㎤)density
(g/cm)
(shore A type)Hardness
(shore A type)
이와 같이 본 발명에 따른 폐 EVA폼을 재활용한 합성피혁의 제조방법은, 폐 EVA폼을 분쇄 및 처리를 통해 재활용이 가능하고, 이를 통해 기존에 폐 EVA폼을 처리하기 위한 비용 및 환경오염 문제를 절감시킬 수 있는 이점이 있다.As described above, the manufacturing method of synthetic leather by recycling waste EVA foam according to the present invention can recycle waste EVA foam through crushing and processing, and through this, the cost and environmental pollution problems for treating waste EVA foam can be solved. There are benefits to savings.
본 발명은 상기한 실시예에 한정되지 아니하며, 적용범위가 다양함은 물론이고, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 다양한 변형 실시가 가능한 것은 물론이다.The present invention is not limited to the above embodiments, and the scope of application is diverse, and various modifications and implementations are possible without departing from the gist of the present invention claimed in the claims.
S100: 조분쇄단계
S200: 미분쇄단계
S300: 거름단계
S400: 합성피혁 제조단계
S410: 코팅액 도포단계
S420: 가압착 1차합지단계
S430: 2차합지단계
S440: 숙성 및 분리단계S100: coarse grinding step
S200: pulverization step
S300: filter step
S400: synthetic leather manufacturing step
S410: coating liquid application step
S420: Pre-compression 1st lamination step
S430: 2nd laminating step
S440: Aging and separation step
Claims (3)
조분쇄된 상기 폐 EVA조각을 300㎛ 이하가 되도록 폐 EVA분말로 분쇄하는 미분쇄단계; 및
상기 폐 EVA분말과 용액형 폴리우레탄수지를 배합하여 복합 코팅액을 제조하고, 상기 복합 코팅액을 원단 일면에 코팅하여 합성피혁을 제조하는 합성피혁 제조단계;를 포함하는 것을 특징으로 하는 폐 EVA폼을 재활용한 합성피혁의 제조방법.Coarsely crushing step of cutting the waste EVA (ethylene-vinyl acetate copolymer) foam into waste EVA pieces such that the width and height are less than 3 cm;
A pulverization step of pulverizing the coarsely pulverized waste EVA pieces into waste EVA powder to a size of 300 μm or less; and
Recycling waste EVA foam comprising a; synthetic leather manufacturing step of preparing a composite coating solution by mixing the waste EVA powder and a solution type polyurethane resin, and coating the composite coating solution on one surface of the fabric to manufacture synthetic leather. A method for manufacturing synthetic leather.
상기 미분쇄단계 이후에,
미분쇄된 상기 폐 EVA분말을 거름체를 이용하여 걸러 여러 사이즈로 분류하는 거름단계;를 더 포함하는 것을 특징으로 하는 폐 EVA폼을 재활용한 합성피혁의 제조방법.According to claim 1,
After the pulverization step,
The manufacturing method of synthetic leather recycling waste EVA foam, characterized in that it further comprises a; sifting step of filtering the pulverized waste EVA powder using a sieve and classifying it into various sizes.
상기 합성피혁 제조단계는,
미분쇄된 상기 폐 EVA분말과 상기 용액형 폴리우레탄 수지가 배합된 상기 복합 코팅액을 1차 민자 이형지의 일면에 도포하는 코팅액 도포단계;
상기 1차 민자 이형지의 일면에 도포된 상기 복합 코팅액의 상부에 상기 원단을 가압착하여 상기 1차 민자 이형지와 상기 원단을 합지시키는 가압착 1차합지단계;
상기 1차 민자 이형지로부터 합지된 상기 원단을 분리하고, 분리된 상기 원단을 2차 패턴 이형지의 일면에 압착하여 합지하는 2차합지단계; 및
합지된 상기 2차 패턴 이형지와 원단을 숙성시키고, 상기 2차 패턴 이형지로부터 합지된 상기 원단을 분리하여 합성피혁을 제조하는 숙성 및 분리단계를 포함하는 것을 특징으로 하는 폐 EVA폼을 재활용한 합성피혁의 제조방법.According to claim 1,
The synthetic leather manufacturing step,
A coating liquid application step of applying the composite coating liquid in which the pulverized waste EVA powder and the solution-type polyurethane resin are mixed to one surface of a primary private release paper;
A first pressure bonding step of bonding the first private release paper and the fabric by pressing the fabric on top of the composite coating liquid applied to one side of the first private release paper;
A secondary lamination step of separating the fabric laminated from the primary private release paper and pressing and bonding the separated fabric to one side of the secondary pattern release paper; and
Aging and separation steps of aging the laminated secondary pattern release paper and fabric and separating the laminated fabric from the secondary pattern release paper to produce synthetic leather Synthetic leather recycled from waste EVA foam, characterized in that Manufacturing method of.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100605015B1 (en) | 2005-03-16 | 2006-07-28 | (주)세영아이앤씨 | Foam products using waste foam and method for manufacturing the same |
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| KR100605015B1 (en) | 2005-03-16 | 2006-07-28 | (주)세영아이앤씨 | Foam products using waste foam and method for manufacturing the same |
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