• Title, Summary, Keyword: polyurethane

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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.

Synthesis and Adhesion Properties of Aliphatic Polyurethane Adhesive (지방족 폴리우레탄 접착제의 합성과 접착 특성)

  • Park, Chang-Moo;Choi, Seung-Ok;Jeong, Noh-Hee
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.4
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    • pp.461-469
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    • 2010
  • Polyurethane adhesive is used in various fields as flexible packaging materials including a food packaging field. Therefore, the purpose of this study is synthesis of polyurethane adhesive which uses aliphatic isocyanate, and compares with aromatic isocyanate. The isocyanates for this test are toluene-2,4-diisocyanate(TDI), hexamethylene diisocyanate(HDI), 4,4-dicyclohexyl ethane diisocyanate($H_{12}MDI$), and isophorone diisocyanate(IPDI). And, the effect of any other diisocyanate are evaluated by several methods as for curing rate test, accelerate weathering test, and peel strength test. The polyurethane adhesive using curing catalyst and HDI has adhesion strength of about 560 g/15 mm between aluminium foil and nylon, about 1,520 g/15 mm between nylon and CPP. Those parameters are similar to polyurethane adhesive with TDI. Also, in case of curing rate, those are similar to TDI type polyurethane adhesive. Moreover, data of ${\Delta}E$ as color variation by QUV tester is equal to 4.12, as 48% against those of TDI type.

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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Effects of Polyurethane as Support Material for the Methanogenic Digester of a Two-Stage Anaerobic Wastewater Digestion System

  • Woo, Kyung-Soo;Yang, Han-Chul;Lim, Wang-Jin
    • Journal of Microbiology and Biotechnology
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    • v.12 no.1
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    • pp.14-17
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    • 2002
  • To increase the efficiency of a two-stage anaerobic wastewater digestion system, various polymers were added to the methanogenic reactor as supports. The addition of polyurethane addition (6%, w/v) to the methanogenic reactor facilitated the organic loading rate (2-day Hydraulic Retention Time), higher than that of the conventional methanogenic reactor (6-day HRT). During the operation of the polyurethane-added reactor, a significant decrease in the organic mass in the effluent (COD 5-6 kg/l) was achieved, compared to that of the conventional reactor (COD 15-20 kg/l). The methane gas production rate also improved about 3-fold in the polyurethane-added reactor. More biomass was found to accumulate in the polyurethane-liquid phase (volatile solid, 26-28kg) than in the free-liquid phase (volatile solid, 5- 7 kg/l) after 90 days of operation. A scaled-up experiment with a polyurethane-added 2.5-1 reactor confirmed the previous results, and no adverse effects such as plugging or channeling due to decreased efficiency was observed even after 4 months of operation.

Preparation and Characterization of Lightweight Fillers and Inorganic Flame Retardants are Added Polyurethane Composite Foam (경량 충진제 및 무기계 난연제 첨가 polyurethane 복합발포체 제조 및 특성)

  • Kang, Dong-Rak
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.3
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    • pp.955-960
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    • 2012
  • In this study, pure Polyurethane and commonly used flame retardants $Al(OH)_3$ and $Mg(OH)_2$, the add-in sample and Cloisite Na+, Cloisite 15A added sample of flammability and mechanical properties are compared. Sodium silicate and a mixture of polyurethane that the lightweight filler Vermiculite, Perlite addition of flame retardant and mechanical properties of the sample was confirmed. As a result, the flame retardant additive in the Vermiculite and Perlite in a flame-retardant grade sample except sample were identified. Tensile strength is degrade accord to the filler amount. But, Sodium silicate in the case of the sample add-in, other than confirmed that the sample strength increases.

Fabrication of Silica-Containing Breathable Waterproof Polyurethane Dispersion Film (Silica를 함유하는 Polyurethane dispersion 투습방수 Film의 제조)

  • Shin, Hyun-Ki;Huh, Man-Woo;Yoon, Nam-Sik
    • Textile Coloration and Finishing
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    • v.27 no.2
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    • pp.126-131
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    • 2015
  • Silica-polyurethane hybrid breathable films were prepared and their breathabilities were assessed. Appropriately aggregated silica was prepared through sol-gel reaction of water glass and its particle size ranged 360~500nm. The polyurethane dispersion was prepared by the reaction of isophorone diisocyanate(IPDI) as diisocyanate and polytetramethylene glycol(PTMG) and dimethylol propionic acid(DMPA) as polyol, particle size ranging 30~120nm. The reaction between isocyanate and hydroxyl group to form urethane bonding was checked by the intensity of the stretch peak of isocyanate at $2270cm^{-1}$ in the FT-IR. The silica was incorporated into polyurethane dispersion and casted into film. It was shown that the incorporated silica(1~5wt.%) increased water vapour permeability of the films by 30~100%, and decreased the hydrostatic pressure by 10~40%. From the results, it could be concluded that the appropriate hybridization of silica can increase the breathability of polyurethane dispersion film, while minimizing the loss of hydrostatic pressure.

A Study on Productivity Improvement through Safety Management and Manufacturing Process Reengineering : Case Study in Polyurethane Manufacturer (안전관리 및 생산 공정 개선을 통한 생산성 향상에 관한 연구 : 폴리우레탄 제조업체 사례)

  • Kim, Hyun Soo;Lee, Hyeong-Ryong;Kwon, Ick-Hyun
    • Journal of the Korea Safety Management & Science
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    • v.15 no.4
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    • pp.185-196
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    • 2013
  • Polyurethane is an elastomer polymer, which is flexible, tough and resistant. This material is widely used various fields such as automobile, aeroplane, textiles, construction industries. Currently there exists more than 1,000 manufacturing companies in Korea that are closely related to Polyurethane. In spite of a number of Polyurethane manufacturing companies, there are little attention in academia as well as industries to study the safety and manufacturing process improvement on Polyurethane. In this paper, we consider a case study for the Polyurethane manufacturer to improve productivity by using safety management and manufacturing process reengineering. After careful analysis, we derive three enhancements to increasing the safety and productivity for the target company. Especially, we achieve about 16% productivity improvement in roller manufacturing process by replacing manual stirring job with automated mixing machine.

Dynamic Response of Polyurethane Foam with Density and Temperature Effects (폴리우레탄 폼의 동적 응답에 미치는 밀도 및 온도의 영향)

  • Hwang, Byeong-Kwan;Kim, Jeong-Hyun;Kim, Jeong-Dae;Lee, Jae-Myung
    • Journal of the Society of Naval Architects of Korea
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    • v.56 no.4
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    • pp.291-297
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    • 2019
  • Polyurethane foam is the most efficient, high-performance insulation material, used for liquefied natural gas carrier (LNGC) insulation. Because LNGC is exposed to sloshing impact load due to ship motion of 6 degrees of freedom, polyurethane foam should be sufficient dynamic properties. The dynamic properties of these polyurethane foam depends on temperature and density. Therefore, this study investigates the dynamic response of polyurethane foam for various temperature($25^{\circ}C$, $-70^{\circ}C$, $-163^{\circ}C$) and density($90kg/m^3$, $113kg/m^3$, $134kg/m^3$, $150kg/m^3$) under drop impact test with impact energy of 20J, 50J, and 80J. For dynamic response was evaluated in terms of peak force, peak displacement, absorb energy, and the mechanical property with minimized density effects. The results show the effect of temperature and density on the polyurethane foam material for the dynamic response.

Quantitative Analysis of Relative Adsorption of Disperse Dyes on Polyurethane in Polyurethane-impregnated Polyester Microfibers (폴리우레탄함침 폴리에스터 극세사 소재의 분산염료 염색시 폴리우레탄 성분에 대한 염료의 상대염착률 정량분석)

  • Jun, Heejeong;Park, Suhyeon;Lee, Junheon;Kim, Taekyeong
    • Textile Coloration and Finishing
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    • v.32 no.3
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    • pp.121-127
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    • 2020
  • The analysis method of relative adsorption of disperse dyes on impregnated polyurethane resin and polyester fiber separately was investigated. The solvents for extracting the dyes from polyurethane resin and polyester fiber were determined by acetone and DMF, respectively. By extracting the dyed fibers with acetone at room temperature within 30 minutes, the dyes adsorbed only on the polyurethane resin could be extracted. And then by additional extracting the same fabrics with DMF at 95℃ for longer than 1 hour, the dyes adsorbed on polyester fabrics was extracted. This means that the dyes adsorbed on polyurethane and polyester could be extracted separately and that relative adsorption of the dyes on the both components could be analyzed quantitatively. Using this analysis method, the relative adsorption of a disperse dye was investigated after reduction clearing with various conditions.

Flame Retardant Property of PU by the Addition of Phosphorous Containing Polyurethane Oligomers (폴리우레탄을 인계화합물로 해중합한 올리고머의 난연성)

  • Jung, Sunyoung;Kang, Sungku;Cho, Ilsung;Koh, Sungho;Kim, Younhee;Chung, Yeongjin;Kim, Sangbum
    • Applied Chemistry for Engineering
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    • v.18 no.4
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    • pp.376-380
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    • 2007
  • Used polyurethane (PU) was chemically degraded by the treatment with flame retardants such as tris(1,3-chloro-2-propyl) phosphate (TCPP), triethyl phosphate (TEP), and trimethyl phosphate (TMP). Analysis of FT-IR and P-NMR showed that the degraded products (DEP) contained oligourethanes. Rigid polyurethane foam was produced using the DEP as flame retardants. The flammability and thermal stability of recycled rigid polyurethane were investigated. The mechanical properties such as compressive strength of recycled polyurethane were also studied. The recycled polyurethane reduced flammability and enhanced thermal stability over intrinsic polyurethane. Mechanical strength of recycled polyurethane also shows as high as that of intrinsic polyurethane. In order to evaluate flame retardant properties of the recycled polyurethane foams with various amounts of DEP, heat release rate (HRR) of the foam was measured by cone calorimeter. Scanning electron micrograph of recycled PU showed a uniform cell morphology as a intrinsic PU.