Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Preparation and Properties of DMF-Based Polyurethanes Containing Bio-Polyol/Ester-Polyol for Wet-Type Polyurethane Artificial Leather

습식 인조피혁용 바이오 폴리올/폴리에스터 폴리올을 함유한 DMF 기반 폴리우레탄의 제조 및 물성

  • Sur, Suk-Hun (Department of Organic Material Science and Engineering, Busan National University) ;
  • Choi, Pil-Jun (Korea Institute of Footwear & Leather Technology) ;
  • Ko, Jae-Wang (Korea Institute of Footwear & Leather Technology) ;
  • Park, Ji-Hyeon (Korea Institute of Footwear & Leather Technology) ;
  • Lee, Jae-Yeon (Korea Institute of Footwear & Leather Technology) ;
  • Lee, Young-Hee (Department of Organic Material Science and Engineering, Busan National University) ;
  • Kim, Han-Do (Department of Organic Material Science and Engineering, Busan National University)
  • 서석훈 (부산대학교 유기소재시스템공학과) ;
  • 최필준 (한국신발피혁연구원) ;
  • 고재왕 (한국신발피혁연구원) ;
  • 박지현 (한국신발피혁연구원) ;
  • 이재년 (한국신발피혁연구원) ;
  • 이영희 (부산대학교 유기소재시스템공학과) ;
  • 김한도 (부산대학교 유기소재시스템공학과)
  • Received : 2018.11.21
  • Accepted : 2018.12.21
  • Published : 2019.03.30
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Abstract

Recently, attention has been paid to obtaining bio-polyols from renewable resources. Successful use of these natural ingredients successfully produced in the industry for the synthesis of various polyurethanes is a very important task. In this study, a series of dimethylformamide (DMF) based polyurethanes were synthesized from methylene diphenyl diisocyanate (MDI)/1, 4-butanediol and bio-polyol (polytrimethylene ether glycol based on 1, 3-propanediol : B-POL)/polyester polyol (polyadipate diol based on 1,4-butandiol : H-PET). The effect of different ratio of bio-polyol (B-POL)/polyester polyol (H-PET) on the physical properties of polyurethane was investigated. As the B-POL content in B-POL/H-PET mixture increased, the glass transition of soft segment (Tgs) and tensile strength of polyurethane decreased, however, the elongation at break and tear strength increased. On the other hand, artificial leather was produced by wet process using synthesized DMF-based polyurethanes. It was found that there was almost no difference in the effect of the B-POL/H-PET composition on the average size and density (the number of cells per unit volume) of the porous cells formed in artificial leather. These results show that there is no problem in using bio-polyol (B-POL) based polyurethane for artificial leather produced by wet process.

일련의 dimethylformamide (DMF) 기반 폴리우레탄은 메틸렌 디 페닐 디 이소시아네이트(MDI) 1,4-부탄 디올 및 바이오 폴리올(1,3-프로판 디올: B-POL)에 기초한 폴리 트리 메틸렌 에테르 글리콜/폴리 에스터 폴리올(1,4-부탄디올: H-PET)으로 부터 합성하였다. 본 연구에서는 바이오 폴리올(B-POL)/폴리에스터 폴리올(H-PET)의 조성이 폴리우레탄의 물성에 미치는 영향을 조사하였다. B-POL/H-PET 혼합물의 B-POL 함량이 증가할수록 폴리우레탄의 소프트 세그먼트의 유리전이온도(Tgs)와 인장 강도는 감소하는 반면, 파괴 신도 및 인열 강도는 증가하였다. 한편 합성된 DMF 기반 폴리우레탄을 이용하여 습식공정으로 인조피혁을 제조하였다. 인조피혁에 형성된 다공성 셀의 평균 크기 및 밀도(단위부피당 셀의 수)에 미치는 B-POL/H-PET 조성의 영향의 차이는 거의 없는 것을 알 수 있었다. 이러한 결과들로부터 바이오 폴리올 기반 폴리우레탄을 습식공정으로 제조되는 인조피혁용으로 사용하는데 별 문제가 없음을 알 수 있었다.

Keywords

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Scheme 1. Preparation process of DMF based polyurethanes.

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Figure 1. Viscosity of PUs.

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Figure 2. FT-IR spectra of PUs.

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Figure 3. DSC thermograms of PU films.

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Figure 4. Storage modulus (a), loss modulus (b), and tan delta (c) of PU films.

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Figure 5. TGA (a) and DTG (b) curves of PU films.

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Figure 6. Stress-strain curves of PU films.

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Figure 7. SEM micrographs of wet-type artificial leather based on nonwoven fabrics coated with DMF based polyurethane.

Table 1. Macroglycols used in this study

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Table 2. Sample designation and composition of polyurethanes containing bio polyol

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Table 3. Thermal and mechanical properties of polyurethanes films

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