• Title/Summary/Keyword: thermoplastic polyurethane film

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A Study on the Effect of Primer Processing Method on the Mechanical Properties of Impact Relief Air Cushion Materials Prepared through Thermal Film Laminating (프라이머 가공 방법이 열융착 필름 라미네이팅으로 제조한 고충격 대응 에어쿠션 소재의 물성에 미치는 영향 연구)

  • Kim, Ji Yeon;Kim, Hun Min;Min, Mun Hong
    • Textile Coloration and Finishing
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    • v.34 no.3
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    • pp.173-184
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    • 2022
  • In this study, the TPU film was laminated on an aramid fabric or circular knits in order to implement an air cushion material that can respond to high impact forces in case of a fall and is easy to expand. To increase the bonding strength between the fabric layer and the film layer, a primer layer was formed in two ways: one for thermally bonding and laminating PET film and two for coating and aging hot melt type PUR adhesive. The tensile strength of the aramid air cushion was 2.5 times higher than that of the circular knits, but the tensile elongation of the aramid air cushion was very low compared to that of the circular knits. The tear strength of the aramid air cushion was about twice or more superior to that of the circular knits, the primer treatment method was good at A, and the peel strength was excellent at method A. The aramid air cushion was the lightest in weight. Summarizing the above results, it was best to combine the air cushion material with aramid woven fabric and primer treatment method A to cope with the high impact force applied when falling.

Effect of Hot Pressing/Melt Mixing on the Properties of Thermoplastic Polyurethane

  • Lee, Young-Hee;Kang, Bo-Kyung;Kim, Han-Do;Yoo, Hye-Jin;Kim, Jung-Soo;Huh, Jae-Ho;Jung, Young-Jin;Lee, Dong-Jin
    • Macromolecular Research
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    • v.17 no.8
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    • pp.616-622
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    • 2009
  • In-depth understanding of the influence of hot pressing and melt processing on the properties of thermoplastic polyurethane (TPU) is critical for effective mechanical recycling of TPU scraps. Therefore, this study focused on the effects of hot pressing and melt mixing on molecular weight (MW), polydispersity index (PDI), melt index (MI), characteristic IR peaks, hardness, thermal degradation and mechanical properties of TPU. The original TPU pellet (o-TPU) showed two broad peaks at lower and higher MW regions. However, four TPU film samples, TPU-0 prepared only by hot pressing of o-TPU pellet and TPU-1, TPU-2 and TPU-3 obtained by hot pressing of melt mixed TPUs (where the numbers indicate the run number of melt mixing), exhibited only a single peak at higher MW region. The TPU-0 film sample had the highest $M_n$ and the lowest PDI and hardness. The TPU-1 film sample had the highest $M_w$ and tensile modulus. As the run number of melt mixing increased, the peak-intensity of hydrogen bonded C=O stretching increased, however, the free C=O peak intensity, tensile strength/elongation at break and average MW decreased. All the samples showed two stage degradations. The degradation temperatures of TPU-0 sample (359 $^{\circ}C$ and 394 $^{\circ}C$)were higher than those of o-TPU (342 $^{\circ}C$ and 391 $^{\circ}C$). While all the melt mixed samples degraded at almost the same temperature (365 $^{\circ}C$ and 381 $^{\circ}C$). The first round of hot pressing and melt mixing was found to be the critical condition which led to the significant changes of $M_n$/$M_w$/PDI, MI, mechanical property and thermal degradation of TPU.

The Effects of Water-Proof Polyurethane Coating based on Castor oil and TDI on the Starch-Glycerol Film Under Humidity (Castor Oil과 TDI로 합성한 폴리우레탄 방수코팅이 전분-글리세롤 필름의 습도반응특성에 미치는 영향)

  • 양영준;신형철;김대현;나성기;박종신
    • Proceedings of the Korean Fiber Society Conference
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    • 2002.04a
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    • pp.289-292
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    • 2002
  • 전분을 이용한 환경친화성 고분자 플라스틱 재료에는 전분충진형, blend형 등이 있으나, 대체로 전분은 보조재료로 사용된다. 이에 반해 extruder를 이용한 전분발포체나 TPS (Thermoplastic starch) 등은 전분을 주재료로 사용하여 플라스틱 재료를 만드는 것이지만, TPS 필름의 Tg가 실온보다 높아 glassy 상태의 brittle한 성질로 인해 물성이 낮으며, 수분 친화적인 성질로 인해 플라스틱 재료로서의 사용이 제한되는 단점이 있다[1,2]. (중략)

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High Temperature Supercapacitor with Free Standing Quasi-solid Composite Electrolytes (독립형 반고체 복합 전해질을 적용한 고온 수퍼커패시터)

  • Kim, Dong Won;Jung, Hyunyoung
    • Korean Journal of Materials Research
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    • v.29 no.2
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    • pp.121-128
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    • 2019
  • Supercapacitors are attracting much attention in sensor, military and space applications due to their excellent thermal stability and non-explosion. The ionic liquid is more thermally stable than other electrolytes and can be used as a high temperature electrolyte, but it is not easy to realize a high temperature energy device because the separator shrinks at high temperature. Here, we report a study on electrochemical supercapacitors using a composite electrolyte film that does not require a separator. The composite electrolyte is composed of thermoplastic polyurethane, ionic liquid and fumed silica nanoparticles, and it acts as a separator as well as an electrolyte. The silica nanoparticles at the optimum mass concentration of 4wt% increase the ionic conductivity of the composite electrolyte and shows a low interfacial resistance. The 5 wt% polyurethane in the composite electrolyte exhibits excellent electrochemical properties. At $175^{\circ}C$, the capacitance of the supercapacitor using our free standing composite electrolyte is 220 F/g, which is 25 times higher than that at room temperature. This study has many potential applications in the electrolyte of next generation energy storage devices.

Study on the High-Strength Air-Cushion Fabrics for Impact-Relief Application Prepared through Primer Coating and Thermal Film Laminating (프라이머 코팅과 열융착 필름 라미네이팅을 통해 제조한 충격 완화용 고강력 에어쿠션 직물에 관한 연구)

  • Kim, Ji Yeon;Kim, Hun Min;Min, Mun Hong
    • Textile Coloration and Finishing
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    • v.33 no.4
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    • pp.269-279
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    • 2021
  • In this study, the laminating of TPU film after coating of primer adhesive on the fabrics was applied in order to secure the strength to withstand a fall from a higher altitude by increasing the adhesion between the fabric and the film layer. It seems that the fineness of the yarn and the weave construction have a greater effect than the type of the laminating films. The order of superiority of the laminated fabrics by film type and thickness was the same for 1000 denier and 210 denier fabrics, and the tendency was consistent with the order of superiority in the film properties and peel strength tests. The tear strength of laminating fabrics increased three to four times for 1000 denier fabrics compared to the fabric alone, but it decreased by 2 times for the 210 denier fabrics. Summarizing the above results, it is most appropriate to combine 1000d fabric with three types of laminating films(100~200㎛ thickness) of A(0.2T) or B(0.15T) or D(0.1T) considering the air pressure resistance, the impact resistance during the fall, and the durability against damage during use.

Water Vapour Permeable/Water Resistant and Heat Resistant Finishing of Footwear Fabric (신발용 직물의 투습방수 및 내열성 가공)

  • Lee, Jae Ho;Choi, Hae Wook
    • Journal of Adhesion and Interface
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    • v.7 no.3
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    • pp.16-25
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    • 2006
  • Water vapour permeable and water resistant film was laminated to made footwear woven fabric and non-woven fabrics by screen type with thermosetting reactive hot melt adhesive. Optimum conditions of each process were investigated, and the properties of film laminated fabric with optimum conditions are evaluated. The results are as follows. Thermosetting reactive polyurethane hot melt is retain proper heat resistance differently thermoplastic hot melt. Optimum melting adhesive process conditions are as follows ; drum temperature $95^{\circ}C$, hose temperature $97^{\circ}C$, feeding pipe temperature $100^{\circ}C$, screen temperature $105^{\circ}C$, pressure of opposite roller $1kgf/cm^2$, pressure of laminating roller $3kgf/cm^2$, finishing speed 15 m/min, melting temperature $120^{\circ}C$, cooling time 20 s, pressing temperature $130^{\circ}C$, pressing time 30 s. As the thickness of film was increased, the water vapour permeability was decreased but water resistance was increased, and the effect of film is dominant over all the others in the air permeability.

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Study on the Applicability of the Air Cushion Material for Impact Relief through Thermal Bonding of High Strength Fabrics (고강력 직물의 열융착 라미네이팅을 통한 충격 완화용 에어쿠션 소재로의 적용 가능성 검토 연구)

  • Kim, Ji Yeon;Kim, Hun Min;Min, Mun Hong
    • Textile Coloration and Finishing
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    • v.32 no.3
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    • pp.176-183
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    • 2020
  • In order to study wearable air cushion materials capable of responding to massive impact in high-altitude fall situation, high tenacity woven fabrics were bonded by heat only depending on various type of thermoplastic films and then mechanical properties were measured. Tensile strength, elongation, and 100% modulus measurement results for 4 types of films show that TPU-2 has higher impact resistance and easier expansion than PET-1. After thermal bonding, the combination with the highest tensile strength was a material with a TPU-2 film for nylon and a PET-2 film for PET, so there was a difference by type of fabric. The tear strength of the bonded materials were increased compared to the fabric alone, which shows that durability against damage such as tearing can be obtained through film adhesion. All of the peel strengths exceeded the values required by automobile airbags by about 5 times, and the TPU-2 bonded fabric showed the highest value. The air permeability was 0 L/dm2 /min. For both the film and the bonded material, which means tightness between the fabric and the film through thermal bonding. It is expected to be applied as a wearable air cushion material by achieving a level of mechanical properties similar to or superior to that of automobile airbags through the method of bonding film and fabric by thermal bonding.