• Title, Summary, Keyword: polyurethane

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Recycling of Polyurethane Scraps (폴리우레탄 스크랩의 재활용)

  • Kim, Han-Na;Lee, Dai-Soo
    • Elastomers and Composites
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    • v.47 no.2
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    • pp.104-110
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    • 2012
  • Depending on the states of polyurethane scraps generated in the production sites of polyurethane or recycling center of polyurethane scraps, appropriate recycling technologies can be employed for the recycling of resources. In this study, recycling technologies for the polyurethane scraps were classified into physical recycling, chemical recycling, and energy recycling and reports in the literatures were discussed.

Numerical analysis on foam reaction injection molding of polyurethane, Part A: Considering re-condensation of physical foam agent

  • Han, HyukSu;Nam, Hyun Nam;Eun, Youngkee;Lee, Su Yeon;Nam, Jeongho;Ryu, Jeong Ho;Lee, Sung Yoon;Kim, Jungin
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.26 no.5
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    • pp.209-214
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    • 2016
  • Foam reaction injection molding (FRIM) is a widely used process for manufacturing polyurethane foam with complex shapes. Numerical model for polyurethane foam forming reaction during FRIM process has been intensively investigated by a number of researchers to precisely predict final shapes of polyurethane foams. In this study, we have identified a problem related with a previous theoretical model for polyurethane foam forming reaction. Thus, previous theoretical model was modified based on experimental and computational results.

Effect of high molecular weight isocyanate contents on manufacturing polyurethane foams for improved sound absorption coefficient

  • Sung, Giwook;Kim, Jung Hyeun
    • The Korean Journal of Chemical Engineering
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    • v.34 no.4
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    • pp.1222-1228
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    • 2017
  • Noises generated in automobile compartments can be controlled by utilizing sound absorption and insulation materials such as polyurethane foams. Polyurethane foams are synthesized by varying polymeric methylene diphenyl diisocyanate (MDI) content for exploring the effect of high functional isocyanate on cellular and acoustic properties. The use of polymeric MDI affects polyurethane matrix modulus and drainage flow rate of the foams, and it also has strong effects on cell structure and air flow resistance (AFR). The highest sound absorption coefficient is achieved at the optimum amount of the polymeric MDI. Therefore, the optimum amount of polymeric MDI content is recommended to achieve not only high sound absorption coefficient but also high transmission loss from the polyurethane foams.

Study on Thermal and Physical Properties of One-component Curable Hybrid Polyurethane Elastomer (1액 경화형 하이브리드 폴리우레탄 탄성체의 열적, 물리적 특성에 관한 연구)

  • Mok, Dong Youb;Kim, In-Soo;Kim, Dong Ho;Kim, Gu Ni
    • Elastomers and Composites
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    • v.47 no.4
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    • pp.318-328
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    • 2012
  • In this study, the one-component curable polyurethane resin was manufactured using blocked isocyanate and hybrid technology. To prepare the one-component curable hybrid polyurethane, silica hybrids including hydroxyl group was synthesized, and the size, shape and distribution of hybrid particle in polyurethane resin were confirmed. Then the dissociation property, mechanical property and molding property of blocked isocyanate were investigated. The dissociation property of blocked isocyanate in one-component curable polyurethane became better as the heating temperature and treatment time increased. The synthesized silica hybrid had spherical appearance and size of 23~27 nm in diameter, and it was observed that the hybrid particles were homogeneously distributed in polyurethane structure. In the case of hybrid polyurethane, the mechanical property, anti-abrasion and thermal property were higher than those of general polyurethane, and it was observed that the mechanical property was maintained when the plasticizer was introduced.

Synthesis and Characteristics of Cationic Polyurethane-Acrylates as a Retention Aid (양이온성 폴리우레탄-아크릴레이트계 보류향상제의 합성 및 특성)

  • Han, Chul;Kim, Doo-Won;Yoon, Doo-Soo;Kim, Sun;Hong, Wan-Hae;Kim, Jung-Gyu
    • Elastomers and Composites
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    • v.39 no.3
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    • pp.209-216
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    • 2004
  • Two types of polyurethane-acrylate polymer were synthesized by reaction of 2-hydroxyethyl methacrylate(HEMA), acrylamide(AA), and polyurethane prepolymer. Water-soluble cationic polyurethane/acrylate retention aids were prepared by using polyurethane-acrylate, benzyl chloride and distilled water. The retention, drainage and strength properties of the retention aids were investigated. The retention of cationic polyurethane/acrylate type retention aids maintained around 70 % regardless of nm. COD value of white water was much reduced by adding the retention aids to it. Drainage property was also improved by addition of the retention aids. In addition, specific compression strength of the paper was improved a little by addition of the retention aids. PU-HEMA type showed better performance than PU-AA in terms of compression strength of the paper.

A Study on the Handle of Cotton Fabric treated with Chitosan Polyurethane Mixed Solution by KES (I) (키토산-폴리우레탄 혼합용액(混合溶液)으로 처리(處理)된 면직물(綿織物)의 KES에 의한 태분석(態分析) (I))

  • Yoon, Se-Hee;Jeon, Dong-Won;Kim, Jong-Jun
    • Journal of Fashion Business
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    • v.8 no.1
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    • pp.141-155
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    • 2004
  • Chitosan, the natural biodegradable polymer derived from chitin by de- acetylation, has been widely applied to the textile finishing processes for excellent anti-microbial characteristic and handle improvement of fabric. The purpose of this study is to investigate the change of handle when cotton fabric is treated with chitosan-polyurethane mixed solution. The viscosity values of chitosan solutions were 8cps and 50cps, and the wet-pick-up% was maintained at 90%. In case of mixing with water soluble polyurethane, the mixture ratio of chitosan and polyurethane was settled on the solid content ratio of 1:0, 1:0.5, 1:1, 1:2. Also the change of physical properties by neutralization in NaOH solution was studied. The results can be summarized up as follows : 1. Extensibility(EM) and tensile energy(WT) of cotton fabric treated with chitosan are decreased, but bending rigidity(B) is remarkably increased. With the addition of polyurethane, the decrease of EM and WT is weakened and the increase of B is weakened. The case of neutralization is similar to the case of polyurethane addition. 2. By treating fabric with chitosan, FUKURAMI(Fullness and softness) is decreased, but KOSHI(Stiffness), SHARI(Crispness), HARI(Anti-drape Stiff ness) are increased. With the addition of polyurethane, the decrease of FUKURAMI is diminished and the increase of KOSHI, SHARI, HARI are diminished. 3. As the viscosity of chitosan solution increased, the air permeability value increased. The addition of polyurethane decreased the air permeability.

Preparation and Properties of Aniline Terminated Waterborne Polyurethane/Multi-walled Carbon Nanotube Composite Coating Solutions (Aniline Terminated Waterborne Polyurethane/Multi-walled Carbon Nanotube 복합 코팅 용액의 제조 및 물성)

  • Hong, Min Gi;Kim, Byung Suk;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.50 no.3
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    • pp.403-409
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    • 2012
  • Polyurethane prepolymers were prepared from poly (carbonate diol), isophrone diisocyanate, and dimethylol propionic acid. Then, aniline terminated waterborne polyurethane dispersion (ATWPUD) was synthesized by capping aniline on the NCO group of the prepolymer. Subsequently, ATWPUD was mixed with multi-walled carbon nanotube (MWCNT) to yield coating solutions, and the mixture was coated on the polycarbonate substrate. The surface resistance ($10^{7.6}{\sim}10^{7.7}{\Omega}/cm^2$) of coating films from ATWPUD showed better conducting properties than that ($10^{10.9}{\Omega}/cm^2$) from pure waterborne polyurethane dispersion (WPUD) when MWCNT was mixed. Also, the surface resistance of coating films was increased, but the pencil hardness and adhesion were decreased with increasing the amount of MWCNT added in the ATWPUD.

Preparation and Properties of Aminosilane Terminated Waterborne Polyurethane (Aminosilane Terminated 수분산 폴리우레탄 코팅 용액의 제조 및 특성)

  • Shin, Yong Tak;Hong, Min Gi;Choi, Jin Joo;Lee, Won Ki;Lee, Gyoung Bae;Yoo, Byung Won;Lee, Myung Goo;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.48 no.4
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    • pp.434-439
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    • 2010
  • NCO terminated polyurethane prepolymers were synthesized from isophorone diisocyanate(IPDI), poly(tetramethyleneglycol)(PTMG) and dimethylol propionic acid(DMPA). Subsequently, aminosilane terminated prepolymers were prepared by capping the NCO groups of polyurethane prepolymers with different moles of aminopropyl triethoxysilane(0~0.02 mole) as a coupling agent. The average particle size of the silylated polyurethane solutions increased with increasing APS content. Also, the prepared coating films showed better thermal stability and pencil hardness than pure waterborne polyurethane.

Study of NCO Index and Ripening Condition on Physicochemical Properties of Solvent-less Polyurethane Formulations (NCO 지수와 숙성 조건에 따른 무용제형 폴리우레탄 인조피혁의 물리 화학적 특성에 관한 연구)

  • Eun, Jong Hyun;Lee, Joon Seok;Yoo, Ho Wook;Bae, Han Jo
    • Textile Science and Engineering
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    • v.56 no.2
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    • pp.112-117
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    • 2019
  • In this study, we investigated the chemical and physical properties of polyurethane artificial leather. Polyurethane artificial leather was prepared from polyol, diisocyanate, a chain extender, a catalyst, and nylon circular knit fabric. After manufacturing the artificial leather, the properties of six different samples were investigated according to their NCO index and ripening temperature. The equivalence ratios of the isocyanates (NCO) to polyols containing a hydroxyl group are referred to as the NCO index. Samples with an NCO index of 1.0, 1.4, and 1.8 were synthesized by changing the weight ratio of diisocyanate. Polyurethane artificial leathers were synthesized by varying the ripening temperature at room temperature and $60^{\circ}C$. As the NCO index increased, the number of unreacted NCO functional groups increased, thereby improving the physical properties of polyurethane artificial leathers. When the samples were prepared at a ripening temperature of $60^{\circ}C$, the surface of the polyurethane artificial leather changed, and the physical properties improved.

The Sewability of polyurethane coated fabrics (폴리우레탄 코팅포의 봉제성능)

  • 신혜원;이정순
    • Journal of the Korean Society of Clothing and Textiles
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    • v.25 no.2
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    • pp.350-357
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    • 2001
  • In this study, seam strength, seam elongation and seam efficiency of polyurethane coated fabrics were examined under various sewing conditions using three kinds of fabrics, four kinds of sewing threads and three kinds of stitch lengths. And the sewability of polyurethane coated fabrics were evaluated by FAST system. The results were as follows: 1. Seam strength decreased with the increase of stitch length. The loop strength of sewing thread and the type of base fabric than the type of coated surface had an effect on seam strength. 2. Seam elongation also decreased with the increase of stitch length and was affected by the type of base fabric. The tensile elongation of polyurethans coated fabric had an effect on seam elongation. 3. Sean efficiency also was related to stitch length, the type of base fabric, and seam strength. The suitable seam efficiency was within 50%∼65% in which polyurethane coated fabric and sewing thread broke at the same time. Therefore PS thin and PPC thin sewing threads and 3mm stitch length were suitable to polyurethane coated fabrics. 4. The relaxation shrinkage(RS) of polyurethane coated fabric was smaller than the smallest value of control chart in FAST system. And the extensibility(E) and the shear rigidity(G) were larger than the largest value.

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