KR102229750B1 - Method of preparing nontoxic synthesis leather - Google Patents

Method of preparing nontoxic synthesis leather Download PDF

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KR102229750B1
KR102229750B1 KR1020190145741A KR20190145741A KR102229750B1 KR 102229750 B1 KR102229750 B1 KR 102229750B1 KR 1020190145741 A KR1020190145741 A KR 1020190145741A KR 20190145741 A KR20190145741 A KR 20190145741A KR 102229750 B1 KR102229750 B1 KR 102229750B1
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film
synthetic leather
tpu
polyurethane
heating step
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KR1020190145741A
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Korean (ko)
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엄기천
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엄기천
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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
    • D06N3/12—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
    • D06N3/145—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 two or more layers of polyurethanes
    • 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
    • D06N3/18—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with two layers of different macromolecular materials
    • D06N3/183—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with two layers of different macromolecular materials the layers are one next to the other

Abstract

The present invention relates to a method for manufacturing non-toxic synthetic leather, in which an organic solvent is not used, thereby being environmentally friendly and providing an excellent working environment. Moreover, the present invention provides a method for manufacturing synthetic leather, in which a polyurethane film is laminated on fabric by using film-type thermoplastic polyurethane (TPU) and a hot melt adhesive, thereby providing a method for manufacturing synthetic leather which does not use an organic solvent, is environmentally-friendly, and provides an excellent working environment. According to the present invention, in the manufactured synthetic leather, a shape, a character, a picture, and the like are formed on a bottom surface of a polyurethane film and the bottom surface is laminated with a thermoplastic polyurethane film, so that the shape is not exposed to the outside (skin surface) of the leather. Accordingly, the manufactured synthetic leather can be maintained for a long time without being damaged in the shape or color even by surface scratches, contact with solvents, changes in an external environment, and the like. The method comprises a base preparation step, a first heating step, and a second heating step.

Description

합성 피혁의 제조방법{Method of preparing nontoxic synthesis leather} Manufacturing method of synthetic leather {Method of preparing nontoxic synthesis leather}

본 발명은 합성 피혁의 제조방법에 관한 것으로, 보다 상세하게는 유기 용제를 전혀 사용하지 않아 친환경적이면서 작업 환경이 우수한 합성 피혁의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing synthetic leather, and more particularly, to a method for manufacturing synthetic leather that is eco-friendly and has an excellent working environment since no organic solvent is used.

일반적으로 합성피혁(Synthetic Leather)이라 함은, 얇은 직물, 편성물에 PU(Poly Urethane), PVC(Poly Vinyl Chloride) 등의 합성 수지로 피막을 입힌 것을 말하며, 신발 갑피나 벨트를 비롯하여 가방, 의류 등을 제작하기 위한 합성피혁 원단으로 널리 사용되고 있다.In general, synthetic leather refers to thin fabrics and knitted fabrics coated with synthetic resins such as PU (Poly Urethane) and PVC (Poly Vinyl Chloride).Shoe uppers or belts, bags, clothing, etc. It is widely used as a synthetic leather fabric for manufacturing.

도 1은 현재 일반적으로 사용되고 있는 우레탄계 합성 피혁을 제조하는 공정도이다.1 is a process chart for manufacturing a urethane-based synthetic leather that is currently generally used.

도 1을 참고하면, 이형지(1)위에 폴리우레탄 배합액을 도포한 후(2) 건조하고 다시 경화성 폴리우레탄 접착제(3)를 도포하여 직. 편물(4)을 접합한 다음 용제를 열로써 제거하여 우레탄 피막을 형성한다. 최종적으로 이형지(1)를 제거한다. Referring to FIG. 1, after applying the polyurethane compounding solution on the release paper (1) (2), drying and then again applying a curable polyurethane adhesive (3) to directly. After joining the knitted fabric 4, the solvent is removed by heat to form a urethane film. Finally, the release paper (1) is removed.

도 1의 방법에서는 사용되는 우레탄 수지의 유기용매는 통상 여러 종류가 사용되는데, 통상 건조 공정에서 유기용매는 대부분 작업장 내로 휘산(揮散)되는 문제점이 있었다. 또한, 비점이 높은 유기용매(예를 들면 MEK,DMF)가 사용되는 경우도 있지만, 이 경우에도 유기용매가 합성피혁 내에 잔류하므로 독성 문제가 여전히 제기되었다. In the method of FIG. 1, there are usually several types of organic solvents of the urethane resin used, and there is a problem that most of the organic solvents are vaporized into the workplace in the usual drying process. In addition, organic solvents with high boiling points (for example, MEK, DMF) are sometimes used, but in this case, too, since the organic solvent remains in the synthetic leather, a toxicity problem is still raised.

본 발명은 제조 과정이나 합성 피혁 제품에 독성이나 유해성 문제가 없는 친환경 합성 피혁을 제공하는 것이다.The present invention is to provide an eco-friendly synthetic leather that does not have toxicity or harmfulness problems in the manufacturing process or synthetic leather products.

본 발명의 하나의 양상은 One aspect of the present invention

열가소성 폴리우레탄(TPU) 필름 상에 핫멜트 필름과 원단을 순차로 적층하여 적층 기재를 준비하는 단계 ;Preparing a laminated substrate by sequentially laminating a hot melt film and a fabric on a thermoplastic polyurethane (TPU) film;

상기 적층기재에 80~140℃의 열을 가해 합지하는 제 1 가열 단계 ;A first heating step of laminating by applying heat of 80 to 140° C. to the laminated substrate;

상기 적층기재의 열가소성 폴리우레탄(TPU) 필름 상에 폴리우레탄 필름을 적층한 후 140~160℃의 열을 가해 합지하는 제 2 가열 단계를 포함하는 합성 피혁의 제조방법에 관련된다.It relates to a method for producing synthetic leather comprising a second heating step of laminating a polyurethane film on the thermoplastic polyurethane (TPU) film of the laminated substrate and then applying heat of 140 to 160°C.

본 발명은 필름 형태의 열가소성 폴리우레탄(TPU)과 핫멜트 접착제를 이용하여 원단에 폴리우레탄 피막을 합지하므로 유기 용매 사용 없는 무독성이면서 작업 환경이 우수한 합성 피혁 제조방법을 제공할 수 있다.The present invention can provide a synthetic leather manufacturing method that is non-toxic and excellent in a working environment without the use of organic solvents because a polyurethane film is laminated to a fabric using a film-type thermoplastic polyurethane (TPU) and a hot melt adhesive.

본 발명에서 제조된 합성피혁에서는 모양, 문자 그림 등이 폴리우레탄 필름 저면에 형성되고, 저면이 열가소성 폴리우레탄 필름과 합지되므로 피혁 외측(스킨면)으로 모양이 노출되지 않는다. 따라서, 본 발명에서 제조된 합성 피혁은 표면 긁힘, 용제와 접촉, 외부 환경 변화 등에 의해서도 모양이나 색상이 손상되지 않고 오랜 시간 유지될 수 있다. In the synthetic leather manufactured in the present invention, shapes and characters are formed on the bottom of the polyurethane film, and the bottom is laminated with the thermoplastic polyurethane film, so the shape is not exposed to the outside of the leather (skin surface). Therefore, the synthetic leather produced in the present invention can be maintained for a long time without damage to its shape or color even by surface scratches, contact with a solvent, or changes in external environment.

도 1은 현재 일반적으로 사용되고 있는 우레탄계 합성 피혁을 제조하는 공정도이다.
도 2는 본 발명의 합성 피혁 제조 공정을 나타낸다.
도 3은 본 발명에서 제조된 합성 피혁의 개념도이다.
도 4는 본 발명에서 제조된 합성피혁으로서, 상층의 폴리우레탄 필름(저면에 모양이 프린팅 되어 있음) 일부를 분리시켜 접은 상태를 촬영한 것이다.
도 5는 저면에 별 모양이 프린팅된 폴리우레탄 필름과 이를 적층기재에 합지시켜 제조된 본 발명의 합성피혁을 촬영한 것이다. 1 is a process chart for manufacturing a urethane-based synthetic leather that is currently generally used.
Figure 2 shows the synthetic leather manufacturing process of the present invention.
3 is a conceptual diagram of the synthetic leather manufactured in the present invention.
Figure 4 is a synthetic leather manufactured in the present invention, photographing a folded state by separating a part of the polyurethane film (the shape is printed on the bottom) of the upper layer.
5 is a photograph of a polyurethane film printed with a star shape on the bottom surface and the synthetic leather of the present invention manufactured by laminating the same on a laminated substrate.

이하에서는 첨부한 도면을 참조하여 본 발명의 실시 예를 상세히 설명한다. 본 발명의 실시 예를 설명함에 있어 관련된 공지 기능 또는 구성에 대한 구체적인 설명이 본 발명의 요지를 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명을 생략할 것이다. 또한, 후술 되는 용어들은 본 발명에서의 기능을 고려하여 정의된 용어들로서 이는 사용자, 운용자의 의도 또는 관례 등에 따라 달라질 수 있다. 그러므로 그 정의는 본 명세서 전반에 걸친 내용을 토대로 내려져야 할 것이다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing an embodiment of the present invention, when it is determined that a detailed description of a related known function or configuration may obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention and may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

도 2는 본 발명의 합성 피혁을 제조하는 방법을 도시한 것이다. 도 2를 참고하면, 본 발명의 방법은 적층 기재 준비단계, 제 1 가열단계, 제 2 가열단계를 포함한다.Figure 2 shows a method of manufacturing the synthetic leather of the present invention. Referring to FIG. 2, the method of the present invention includes a step of preparing a laminated substrate, a first heating step, and a second heating step.

상기 적층 기재 준비 단계는 열가소성 폴리우레탄(TPU) 필름(10) 상에 핫멜트 필름(20)과 원단(30)을 적층하는 단계이다. The step of preparing the laminated substrate is a step of laminating the hot melt film 20 and the fabric 30 on the thermoplastic polyurethane (TPU) film 10.

상기 원단(30)은 부직포,직물이나 재생소가죽일 수 있다.The fabric 30 may be a non-woven fabric, a fabric, or recycled cowhide.

상기 재생 소가죽은 본 출원인의 등록특허 10-1963083호를 참고할 수 있다. 예를 들면, 상기 재생 소가죽은 가루, 조각, 부산물 또는 폐기물을 분쇄하여 소가죽 단섬유를 제조하는 단계, 소가죽 단섬유에 폴리에스터 단섬유를 넣어 혼합하는 단계, 혼합된 단섬유를 일정 두께로 압착하여 재생 원단을 제조하는 단계, 재생 원단을 건조시키는 제 1 건조 단계, 환원제 용액에 상기 재생 원단을 침지시키는 단계 및 상기 재생원단을 물로 세척한 후 건조시키는 제 2 건조 단계를 포함할 수 있다. For the regenerated cowhide, refer to Registration Patent No. 10-1963083 of the present applicant. For example, the regenerated cowhide powder, fragments, by-products or wastes are pulverized to produce short cowhide fibers, the step of mixing short polyester fibers into the short cowhide fibers, and mixing the mixed short fibers with a predetermined thickness. It may include a step of preparing a recycled fabric by compressing it with, a first drying step of drying the recycled fabric, a step of immersing the recycled fabric in a reducing agent solution, and a second drying step of drying the recycled fabric after washing it with water. .

상기 소가죽 단섬유와 폴리에스터 섬유는 중량비로 99~85 : 1~15일 수 있다.The cowhide short fibers and polyester fibers may be 99 to 85: 1 to 15 in weight ratio.

상기 환원제 용액은 아황산수소나트륨 수용액일 수 있다.The reducing agent solution may be an aqueous sodium hydrogen sulfite solution.

상기 재생원단 제조단계는 혼합된 단섬유를 일정 두께로 압착하고 수압으로 섬유를 교락(entangling)시켜 재생 원단(부직포)을 제조하는 단계일 수 있다.The manufacturing step of the recycled fabric may be a step of manufacturing a recycled fabric (nonwoven fabric) by compressing the mixed short fibers to a predetermined thickness and entangling the fibers under water pressure.

상기 재생소가죽은 소가죽 단섬유에 내구성과 탄성이 우수한 폴리에스터 단섬유를 사용하므로 강성이나 탄성이 우수하다.The regenerated cowhide is excellent in stiffness and elasticity because polyester staple fibers having excellent durability and elasticity are used for short cowhide fibers.

상기 열가소성 폴리우레탄(TPU) 필름(10)은 공지된 필름일 수 있다. 예를 들면, 상기 TPU 필름은 이소시아네이트와 폴리올의 반응으로 형성된 선형 폴리머인 열가소성 폴리우레탄으로, 녹는점의 온도가 100~160℃, 바람직하게는 140~160℃인 것을 사용하는 것이 바람직하다.The thermoplastic polyurethane (TPU) film 10 may be a known film. For example, the TPU film is a thermoplastic polyurethane, which is a linear polymer formed by the reaction of an isocyanate and a polyol, and it is preferable to use one having a melting point temperature of 100 to 160°C, preferably 140 to 160°C.

상기 열가소성 폴리우레탄(TPU) 필름(10)은 두께가 0.15~0.3mm, 바람직하게는 0.2~0.3mm일 수 있다.The thermoplastic polyurethane (TPU) film 10 may have a thickness of 0.15 to 0.3 mm, preferably 0.2 to 0.3 mm.

핫멜트 필름(20)은 폴리우레탄계 또는 폴리에스테르계일 수 있다. 상기 핫멜트 필름의 녹는점 온도가 열가소성 폴리우레탄(TPU, Thermoplastic Polyurethane) 필름의 녹는점 온도보다 낮은 것이 바람직하다. 예를 들면, 핫멜트 필름(20)의 녹는점은 상기 열가소성 폴리우레탄(TPU, Thermoplastic Polyurethane) 필름의 녹는점 보다 20℃ 이상 낮을 수 있다. The hot melt film 20 may be polyurethane-based or polyester-based. It is preferable that the melting point temperature of the hot melt film is lower than that of the thermoplastic polyurethane (TPU, Thermoplastic Polyurethane) film. For example, the melting point of the hot melt film 20 may be 20° C. or more lower than the melting point of the thermoplastic polyurethane (TPU) film.

상기 핫멜트 필름(20)의 녹는점 온도는 80~140℃, 80~130℃일 수 있다.The melting point temperature of the hot melt film 20 may be 80 to 140°C and 80 to 130°C.

상기 핫멜트 필름(20)은 두께가 0.05~0.15mm일 수 있다.The hot melt film 20 may have a thickness of 0.05 to 0.15 mm.

상기 핫멜트 필름은 녹는점 이상의 온도를 가하면 용융 후 경화되면서 접착력을 발휘할 수 있다. When a temperature higher than the melting point is applied to the hot melt film, the hot melt film may be melted and then cured to exert adhesive strength.

상기 제 1 가열 단계는 상기 적층기재에 80~140℃의 열을 가해 합지하는 단계이다. 상기 방법은 상기 적층기재에 핫 플레이트(hot plate)나 히팅롤러를 사용하여 상기 적층기재에 열과 압력을 가할 수 있다.The first heating step is a step of laminating by applying heat of 80 to 140°C to the laminated substrate. In the above method, heat and pressure may be applied to the laminated substrate using a hot plate or a heating roller.

제 1 가열 단계에서는 상기 적층 기재 중 핫멜트 필름만이 용융 경화되어 양면에 적층된 상기 열가소성 폴리우레탄(TPU) 필름(10)과 원단이 접착된다.In the first heating step, only the hot melt film of the laminated substrate is melt-cured, and the thermoplastic polyurethane (TPU) film 10 and the fabric laminated on both sides are bonded to each other.

상기 제 2 가열 단계는 상기 적층기재의 열가소성 폴리우레탄(TPU) 필름(10) 상에 폴리우레탄 필름의 저면을 적층한 후 140~160℃의 열을 가해 합지하는 단계이다.The second heating step is a step of laminating by applying heat of 140 to 160° C. after laminating the bottom surface of the polyurethane film on the thermoplastic polyurethane (TPU) film 10 of the laminated base material.

상기 폴리우레탄 필름은 폴리이소시아네이트 및 폴리올이 축중합된 경화성 필름으로서, 두께가 0.02~0.20mm일 수 있다.The polyurethane film is a curable film obtained by condensation polymerization of polyisocyanate and polyol, and may have a thickness of 0.02 to 0.20 mm.

상기 제 2 가열 단계는 상기 폴리우레탄 필름 상부를 핫 플레이트(열120도~180℃)로 2~5m/min의 속도로 압착(2kg/㎠~10kg/㎠)한 후 제거되면 하부의 열가소성 폴리우레탄 필름이 용융된 후 경화되면서 상기 우레탄 필름과 접착된다.In the second heating step, the upper part of the polyurethane film is compressed (2kg/㎠~10kg/㎠) with a hot plate (heat 120°C~180℃) at a speed of 2~5m/min and then removed, the thermoplastic polyurethane of the lower part The film is melted and then cured to adhere to the urethane film.

상기 방법은 상기 폴리우레탄 필름의 저면에 모양을 형성 한 후 상기 제 2 가열 단계를 수행할 수 있다. 상기 폴리우레탄 필름의 저면은 상기 열가소성 폴리우레탄 필름상면과 합지될 수 있다. The method may perform the second heating step after forming a shape on the bottom surface of the polyurethane film. The bottom surface of the polyurethane film may be laminated with the top surface of the thermoplastic polyurethane film.

상기 폴리우레탄 필름의 저면에 모양을 형성하는 방법은 공지된 다양한 방법을 이용할 수 있다. 예를 들면, 상기 폴리우레탄 필름 저면에 소정 모양이나 그림, 문자를 컬러 프린팅으로 형성할 수 있다. As a method of forming a shape on the bottom surface of the polyurethane film, various known methods can be used. For example, a predetermined shape, picture, or character may be formed on the bottom of the polyurethane film by color printing.

기존의 승화전사법으로 폴리우레탄 표면에 문양을 형성하는 방법은 폴리우레탄층에 전사지를 붙이고 열과 압력을 이용하여 폴리우레탄 표면에 염료가 스며들게 하는 방식으로서, 폴리우레탄 표면에 문양 형성이 뚜렷이 일어나지 않을 뿐만 아니라 잉크의 점착성이 떨어지고, 전사 후 시간이 지날수록 승화성 염료의 증발에 따라 무늬가 점차로 옅어져 제품의 질을 저하시키는 문제점이 있었다. The conventional sublimation transfer method to form a pattern on the polyurethane surface is a method of attaching a transfer paper to the polyurethane layer and using heat and pressure to allow dye to permeate the polyurethane surface. In addition, there is a problem in that the adhesiveness of the ink is lowered, and as time passes after transfer, the pattern gradually fades as the sublimation dye evaporates, thereby deteriorating the quality of the product.

반면, 본 발명에서 제조된 합성피혁에서는 모양, 문자 그림 등이 폴리우레탄 필름 저면에 형성되고, 저면이 열가소성 폴리우레탄 필름과 합지되므로 피혁 외측(스킨면)으로 모양이 노출되지 않는다. 따라서, 본 발명에서 제조된 합성 피혁은 표면 긁힘, 용제와 접촉, 외부 환경 변화 등에 의해서도 모양이나 색상이 손상되지 않고 오랜 시간 유지될 수 있다. On the other hand, in the synthetic leather manufactured in the present invention, shapes and characters are formed on the bottom of the polyurethane film, and the bottom is laminated with the thermoplastic polyurethane film, so the shape is not exposed to the outside of the leather (skin surface). Therefore, the synthetic leather produced in the present invention can be maintained for a long time without damage to its shape or color even by surface scratches, contact with a solvent, or changes in external environment.

상기 방법은 상기 제 2 가열 단계 이후에 상기 폴리우레탄 필름의 상면에 요철을 이용한 무늬, 문양 또는 패턴을 형성하는 후가공 단계를 포함할 수 있다.The method may include a post-processing step of forming a pattern, pattern, or pattern using irregularities on the upper surface of the polyurethane film after the second heating step.

본 발명의 방법은 필름 형태의 열가소성 폴리우레탄(TPU)과 핫멜트 접착제를 이용하여 원단에 폴리우레탄 피막을 합지하므로 유기 용매 사용 없는 친환경적이면서 작업 환경이 우수한 합성 피혁 제조방법을 제공할 수 있다.The method of the present invention can provide a synthetic leather manufacturing method that is eco-friendly and has an excellent working environment without the use of organic solvents because a polyurethane film is laminated to a fabric using a film-type thermoplastic polyurethane (TPU) and a hot melt adhesive.

다른 양상에서, 본 발명의 합성 피혁은 원단(30), 핫멜트 필름(20), 열가소성 폴리우레탄(TPU) 필름(10) 및 폴리우레탄 필름(40)을 포함한다.In another aspect, the synthetic leather of the present invention includes a fabric 30, a hot melt film 20, a thermoplastic polyurethane (TPU) film 10, and a polyurethane film 40.

상기 원단(30)은 부직포,직물이나 재생소가죽일 수 있다.The fabric 30 may be a non-woven fabric, a fabric, or recycled cowhide.

핫멜트 필름(20), 열가소성 폴리우레탄(TPU) 필름(10) 및 폴리우레탄 필름(40)은 앞에서 상술한 내용을 참고할 수 있다.The hot melt film 20, the thermoplastic polyurethane (TPU) film 10, and the polyurethane film 40 may be referred to as described above.

도 4는 본 발명에서 제조된 합성피혁으로서, 상층의 폴리우레탄 필름(저면에 모양이 프린팅 되어 있음) 일부를 분리시켜 접은 상태를 촬영한 것이고, 도 5는 저면에 별 모양이 프린팅된 폴리우레탄 필름과 이를 적층기재에 합지시켜 제조된 본 발명의 합성피혁을 촬영한 것이다. 도 4와 도 5를 참고하면, 본 발명의 무독성 합성 피혁은 폴리우레탄 필름(40) 저면에 모양이 형성되고, 상기 폴리우레탄 필름(40)의 저면을 열가소성 폴리우레탄(TPU) 필름(10) 상에 합지하므로, 피혁 외측(스킨면)으로 모양이 노출되지 않음을 확인할 수 있다. Figure 4 is a synthetic leather manufactured in the present invention, photographing a folded state by separating a part of the upper layer of the polyurethane film (the shape is printed on the bottom), and Figure 5 is a polyurethane film with a star shape printed on the bottom surface And it is a photograph of the synthetic leather of the present invention manufactured by laminating it on a laminated substrate. 4 and 5, the non-toxic synthetic leather of the present invention has a shape formed on the bottom of the polyurethane film 40, and the bottom of the polyurethane film 40 is on the thermoplastic polyurethane (TPU) film 10. Because it is bonded to, it can be confirmed that the shape is not exposed to the outside of the leather (skin surface).

본 발명이 속하는 기술분야에서 통상의 지식을 가진 자는 본 발명의 본질적인 특성에서 벗어나지 않는 범위에서 변형된 형태로 구현될 수 있음을 이해할 수 있을 것이다. 그러므로 개시된 실시예들은 한정적인 관점이 아니라 설명적인 관점에서 고려되어야 한다. 따라서 본 발명의 범위는 전술한 실시예에 한정되지 않고 특허청구범위에 기재된 내용 및 그와 동등한 범위 내에 있는 다양한 실시 형태가 포함되도록 해석되어야 할 것이다. Those of ordinary skill in the art to which the present invention pertains will appreciate that it may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative point of view rather than a limiting point of view. Therefore, the scope of the present invention is not limited to the above-described embodiments, but should be construed to include the contents described in the claims and various embodiments within the scope equivalent thereto.

Claims (4)

열가소성 폴리우레탄(TPU) 필름 상에 핫멜트 필름과 원단을 순차로 적층하여 적층 기재를 준비하는 단계 ;
상기 적층기재에 80~140℃의 열을 가해 합지하는 제 1 가열 단계 ;
상기 적층기재의 열가소성 폴리우레탄(TPU) 필름 상에 경화성 폴리우레탄 필름의 저면을 적층한 후 140~160℃의 열을 가해 합지하는 제 2 가열 단계를 포함하는 합성 피혁의 제조방법으로서,
상기 방법은 상기 경화성 폴리우레탄 필름의 저면에 모양을 형성 한 후 상기 제 2 가열 단계를 수행하고,
상기 핫멜트 필름의 녹는점은 열가소성 폴리우레탄(TPU) 필름보다 낮고,
상기 제 1 가열 단계는 열을 가해 상기 적층 기재 중 핫멜트 필름만을 용융 시켜 양면에 적층된 상기 열가소성 폴리우레탄(TPU) 필름과 상기 원단을 접착하고,
상기 제 2 가열 단계는 상기 경화성 폴리우레탄 필름 상부를 140~160℃의 온도로 가열 압착하여 하부의 열가소성 폴리우레탄(TPU) 필름을 용융시켜 상기 경화성 폴리우레탄 필름을 상기 적층기재에 합지하는 것을 특징으로 하는 합성 피혁의 제조방법.Preparing a laminated substrate by sequentially laminating a hot melt film and a fabric on a thermoplastic polyurethane (TPU) film;
A first heating step of laminating by applying heat of 80 to 140° C. to the laminated substrate;
A method for producing synthetic leather comprising a second heating step of laminating by applying heat of 140 to 160°C after laminating the bottom of the curable polyurethane film on the thermoplastic polyurethane (TPU) film of the laminated base material,
The method performs the second heating step after forming a shape on the bottom surface of the curable polyurethane film,
The melting point of the hot melt film is lower than that of the thermoplastic polyurethane (TPU) film,
In the first heating step, heat is applied to melt only the hot melt film of the laminated substrate to bond the thermoplastic polyurethane (TPU) film laminated on both sides and the fabric,
In the second heating step, an upper portion of the curable polyurethane film is heated and compressed at a temperature of 140 to 160° C. to melt a lower thermoplastic polyurethane (TPU) film, and the curable polyurethane film is laminated to the laminated base material. Synthetic leather manufacturing method. 삭제delete 제 1항에 있어서, 상기 방법은 상기 제 2 가열 단계 이후에
상기 경화성 폴리우레탄 필름의 상면에 요철을 이용한 무늬, 문양 또는 패턴을 형성하는 후가공 단계를 포함하는 것을 특징으로 하는 합성 피혁의 제조방법.The method of claim 1, wherein the method is after the second heating step
A method for producing synthetic leather comprising a post-processing step of forming a pattern, pattern, or pattern using irregularities on the upper surface of the curable polyurethane film. 제 1항에 있어서, 상기 원단은 재생소가죽인 것을 특징으로 하는 합성 피혁의 제조방법.The method of claim 1, wherein the fabric is recycled cowhide.
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