Properties of flexible polyurethane foams prepared from recycled polyols obtained by glycolysis of polyurethane wastes

( Liang Jingyu ),이대수 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

The flexible polyurethane (PU) foam wastes can be depolymerized by glycolysis and the polyols for the PU foams can be recovered. However, the incorporations of the recovered polyols to the flexible PU foam systems are limited due to the high reactivity resulting from the amine derivatives in the recovered polyols. In this study. amines in the recovered polyols were modified by the formylation reaction and the effects of the deaminated recycled polyols on the properties of flexible PU foams were investigated. The recycled polyols could be incorporated into the polyols for the flexible PU foams up to 50% (by wt.) of polyols. It was found that the flexible PU foams prepared from the mixture of recycled polyol and virgin polyol displayed the higher air permeability compared with the flexible PU foams prepared from the virgin polyol.

다양한 폴리올을 갖는 수분산 폴리우레탄의 특성 비교

서석훈(Suk-Hun Sur),이영희(Young-Hee Lee),박차철(Cha-Cheol Park),김한도(Han-Do Kim) 한국청정기술학회 2018 청정기술 Vol.24 No.3

우레탄수지에서 캐비테이션 저항을 높이기 위한 Polyol의 영향

이익수,김낙주,박대원,Lee, Iksoo,Kim, Nackjoo,Pak, Daewon 한국응용과학기술학회 2014 한국응용과학기술학회지 Vol.31 No.4

본 연구에서는 캐비테이션에 의한 부식에 강한 도료를 개발하기 위하여 고탄성의 우레탄 수지에 내마모 성능을 향상시키기 위한 첨가제로서 Polypropylene glycol(PPG), Polycarbonate diol(PCD), Polycaprolactone polyol(PCL-1), Polycaprolactone-tetramethylene glycolether(PCL-2) 등 4가지 종류의 Polyol을 첨가하여 제조한 도료의 물성과 캐비테이션 저항성을 평가하였다. 합성된 도료의 물성을 비교한 결과 Polyol 중에서는 PCD을 첨가한 경우 경도와 내마모성이 높아 캐비테이션 저항성이 높을 수 있는 물성을 가진 것으로 나타났으나 고점도를 가지고 있어서 도료화에 어려움이 있을 것으로 예상되어 점도가 낮은 도료를 위하여 PCL-1을 적절한 첨가제로 선정하였다. PCL-1이 첨가된 도료의 캐비테이션 저항성을 평가한 결과 저항성이 높은 것으로 나타났고 SEM을 이용하여 표면 분석을 통한 기공의 침식현상을 관찰하였다. In this study, a new paint which is able to resist the cavitation erosion is tried to be developed by using urethane added with polyol such as poly propylene glycol(PPG), poly carbonate diol(PCD), polycaprolactone polyol (PCL-1), and poly caprolactone-tetramethylene gylcolether polyol(PCL-2). The new paint synthesized by adding polyol was characterized with physical properties and resistivity to cavitation erosion. Among polyol, the prepolymer added with PCD showed high hardness and wear resistance. However, due to too high in viscosity, the prepolymer added with PCL-1 was selected as a paint. The paint added with PCL-1 showed high resistivity to cavitation erosion and its surface was monitored by using Scanning Electron Microscope.

polyester polyol/변성폴리올과 MDI에 의한 prepolymer 제조 및 이를 이용한 우레탄 foam의 제조에 미치는 polyester polyol량의 영향

박찬영,김민정,류기정,이원기 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1

polyester polyol과 acrylic polyol을 혼합 사용하여 PU 발포체를 제조한 후 물성을 측정하는 데 있어서 acrylic polyol 함량 변화에 따른 인장강도, 경도 및 인열강도 등의 기계적 성질에 미치는 영향을 검토하였다. 또한 acrylic polyol함량에 따른 FT-IR, 형태학적 변화 및 내가수분해성의 변화를 측정하여 이들 간의 상관관계를 규명하였다. 이러한 물성 이외에도 시차주사칼로리미터, 열중량분석, 동적기계적 분석장비 등을 이용하여 foam의 중요한 특성인 열적 성질을 측정하였다. 즉 DSC를 사용하여 acrylic polyol함량에 따른 Tg의 변화, TGA를 사용하여 acrylic polyol함량 변화에 따른 열안정성 검토 및 DMA를 사용하여 acrylic polyol함량 변화에 따른 저장탄성율과 tan δ 등의 물성을 검토하였다.

우레탄수지에서 캐비테이션 저항을 높이기 위한 Polyol의 영향

이익수,김낙주,박대원 한국유화학회 2014 한국응용과학기술학회지 Vol.31 No.4

본 연구에서는 캐비테이션에 의한 부식에 강한 도료를 개발하기 위하여 고탄성의 우레탄 수지에 내마모 성능을 향상시키기 위한 첨가제로서 Polypropylene glycol(PPG), Polycarbonate diol(PCD), Polycaprolactone polyol(PCL-1), Polycaprolactone-tetramethylene glycolether(PCL-2) 등 4가지 종류의 Polyol을 첨가하여 제조한 도료의 물성과 캐비테이션 저항성을 평가하였다. 합성된 도료의 물성을 비교한 결과 Polyol 중에서는 PCD을 첨가한 경우 경도와 내마모성이 높아 캐비테이션 저항성이 높을 수 있는 물성을 가진 것으로 나타났으나 고점도를 가지고 있어서 도료화에 어려움이 있을 것으로 예상되어 점도가 낮은 도료를 위하여 PCL-1을 적절한 첨가제로 선정하였다. PCL-1이 첨가된 도료의 캐비테이션 저항성을 평가한 결과 저항성이 높은 것으로 나타났고 SEM을 이용하여 표면 분석을 통한 기공의 침식현상을 관찰하였다. In this study, a new paint which is able to resist the cavitation erosion is tried to be developed by using urethane added with polyol such as poly propylene glycol(PPG), poly carbonate diol(PCD), polycaprolactone polyol (PCL-1), and poly caprolactone-tetramethylene gylcolether polyol(PCL-2). The new paint synthesized by adding polyol was characterized with physical properties and resistivity to cavitation erosion. Among polyol, the prepolymer added with PCD showed high hardness and wear resistance. However, due to too high in viscosity, the prepolymer added with PCL-1 was selected as a paint. The paint added with PCL-1 showed high resistivity to cavitation erosion and its surface was monitored by using Scanning Electron Microscope.

폴리올법을 이용한 미립 코발트 분말 합성

Kim, Dong-Jin,Chung, Hun-Saeng,Woo, Sang-Duck,Lee, Jae-Jang 한국결정성장학회 2001 韓國結晶成長學會誌 Vol.11 No.6

균질한 형상, 좁은 입도분포 그리고 순도가 높은 미립 금속분말은 첨단산업분야에서 응용분야가 점차 확대되고 있다. 본 연구에서는 Polyol법을 이용한 마이크론 크기의 단분산 코발트 분말을 합성하였다 Polyol이 환원제 역할을 하였다. 반응온도, 반응시간, 분산제첨가 및 전구체의 농도 등을 변화시켜 코발트의 입자 크기, 형상 그리고 응집현상을 제어하고자 하였다. 최적의 합성조건은 E.G/DiE/G 부피비 1:4,$Co(OH)<_{2}$polyol 몰비 0.08~0.32 반응온도 $210^{\circ}C$, PVP/Co$(OH)_2$ 몰비 0.4이었다. Fin metal particles of uniform shape, narrow size distribution and high purity are increasingly needed for specific uses in high tech industrial applications. Polyol process for the preparation of monodispersed cobalt powders in micron size is described. In this process in inorganic precursor is reduced in liquid polyol under controlled conditions. The reducing agent is the polyol itself and reaction parameters such as the traction temperature, reaction time, addition of protective agent and concentration of the precursor are varied for controling particles size, shape and agglomeration of the metal particles. An optimum synthesis condition was achieved at E.G/DiE/G volume ratio 1:4,Co$(OH)_{2}$polyol molar ratio 0.08~0.32 reaction temperature $210^{\circ}C$, PVP/Co$(OH)_{2}$ molar ratio 0.4.

Acrylic Polyol 함량을 달리한 폴리우레탄 제품의 형태학적 열적 및 동적,기계적 성질

김태성 ( Tae Sung Kim ),박찬영 ( Chan Young Park ) 한국고무학회 2013 엘라스토머 및 콤포지트 Vol.48 No.4

acrylic polyol로 개질한 polyester형 polyurethane foam을 quasi prepolymer법으로 제조하였다. 열적 및 동적·기계적 성질은 thermal gravimetric analysis 및 dynamic mechanical analysis에 의하여 분석하였다. 또한 유리전이온도는 differential scanning calorimeter로 측정하였다. Acrylic polyol 함량이 증가함에 따라 TGA에 의해 측정한 열적 안정성은 약간 감소하였다. 그리고 acrylic polyol 함량이 증가함에 따라 저장 탄성률은 증가한 반면에 tan delta 값은 감소하였다. Polyester type polyurethane foam modified with acrylic polyol was prepared by quasi prepolymer method. Thermal and dynamic mechanical properties of polyurethane foam were analysed by thermal gravimetric analysis(TGA) and dynamic mechanical analysis(DMA). Also, glass transition temperature was measured by differential scanning calorimeter( DSC). As acrylic polyol contents were increased, thermal stability measured by TGA was slightly decreased. Storage modulus was increased and tan delta was decreased with increasing of acrylic polyol contents.

Characteristics of polycarbonate polyol from carbon dioxide for thermoplastic polyurethane

( Alagi Prakash Kallappa ),최예진,홍성철,( Ghorpade Ravindra ) 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

Carbon dioxide (CO₂) is becoming an increasingly crucial synthetic feedstock for chemicals and polymers, since it is abundant, cheap, and non-toxic. In present study, commercially available polyols from CO₂ and polyether polyol were successfully incorporated into thermoplastic polyurethanes (TPUs). The thermal, mechanical, and shape memory properties of the TPUs were compared with those of traditional TPUs from petroleum-based polyether polyol such as poly(tetrahydrofuran). Compared with the petroleum-based polyol TPUs, the CO₂-based TPUs exhibited increased glass transition temperature, moduli, and favorable shape memory properties, demonstrating harder and tougher elastomers. In addition, TPUs from CO₂-based polyols exhibited enhanced electrochemical corrosion resistance at room temperature compared with that of polyether-based polyol. These findings suggested that CO₂-based TPUs are promising alternatives to conventional TPUs.

Prepolymer와 Resin Premix로 부터 제조된 Polyurethane Foam의 기계적 성질

김태성 ( Tae Sung Kim ),박찬영 ( Chan Young Park ) 한국고무학회 2013 엘라스토머 및 콤포지트 Vol.48 No.3

polyester형 polyurethane foam은 낮은 내가수분해성을 가지므로 quasi prepolymer법에 의한 acrylic polyol을 사용함으로써 극복될 수 있다. acrylic polyol을 함유한 polyurethane foam은 acrylic polyol 함량이 증가함에 따라 인장강도와 경도가 증가하였다. 하지만 split 인열강도와 인열강도는 약간씩 변화되었다. polyurethane foam의 내가수분해성은 인장강도의 손실 백분율로 측정하였으며 acrylic polyol 함량이 25.5g에서 102g으로 증가함에 따라 향상되었다. Polyester type polyurethane foam has low hydrolysis resistance. It was overcome with addition of acrylic polyol by quasi prepolymer method. Tensile strength and hardness of polyurethane foam contained acrylic polyol was increased with increasing of acrylic polyol contents. But split tear strength and tear strength was slightly changed. Hydrolysis resistance of polyurethane foam was measured by loss % of tensile strength. It was improved with increasing of acrylic polyol contents from 25.5g to 102g.

Polycarbonate polyol from sustainable feedstock for thermoplastic polyurethane

( Alagi Prakash Kallappa ),최예진,홍성철 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0

Carbon dioxide (CO2) is becoming increasingly important synthetic feedstock for chemicals and polymers, since it is abundant, low-cost, and non-toxic. Utilization of CO2 as a sustainable precursor for polyurethane (PU) is becoming a prime attention in polymer industry. In present study, commercially available polyol from CO2 and polyether polyol were successfully incorporated into thermoplastic polyurethanes (TPUs). The thermal and mechanical properties of the TPUs were compared with those of traditional TPUs from petroleum based polyols such as poly(tetrahydrofuran) and polypropylene glycol. The TPUs exhibited increased glass transition temperature and moduli with the CO2 based polyols, demonstrating harder and tougher elastomers in comparison with that from petroleum based polyols. These findings suggest that CO2 based TPUs will be promising alternative to conventional TPUs, enabling new applications of the ecofriendly material in high value added technologies.