• Title/Summary/Keyword: foam reaction

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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.

A Study on the Reaction Characteristics of Steam Reforming Reaction over Catalyzed Porous Membrane (다공성 촉매 분리막을 이용한 수증기 개질 반응 특성 연구)

  • Hong, Sung Chang;Lee, Sang Moon
    • Applied Chemistry for Engineering
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    • v.25 no.2
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    • pp.198-203
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    • 2014
  • In this study, steam reforming reaction and surface characteristics of Ni metal foam plate were investigated. Valence state of Ni could be changed by pretreatment, and metallic Ni species exposed on surface as a active site play important role in steam reforming reaction. Porous catalytic membrane also was prepared by mixing of Ni metal foam plate and Ni-YSZ catalyst to control the pore size and assign the catalytic function in Ni metal foam plate. In SEM analysis results, Pore size of Ni metal foam plate could be controlled and Ni-YSZ catalyst well dispersed on surface. Ni based porous catalytic membrane had a similar steam reforming activity regardless of space velocity.

Fischer-Tropsch synthesis in the novel system: cobalt metallic foam catalyst and heat-exchanger typed reactor (코발트 금속 폼 촉매와 열교환형 반응기를 이용한 Fischer-Tropsch 합성 반응)

  • Yang, Jung-Il;Yang, Jung Hoon;Ko, Chang-Hyun;Kim, Hak-Joo;Chun, Dong Hyun;Lee, Ho-Tae;Jung, Heon
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.11a
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    • pp.133.2-133.2
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    • 2010
  • Fischer-Tropsch synthesis (FTS) was carried out in heat-exchanger typed reactor with cobalt metallic foam catalyst. Considering the heat and mass transfer limitations in the cobalt catalyst, a Co-foam catalyst with an inner metallic foam frame and an outer cobalt catalyst was developed. The Co-foam catalyst was highly selective toward liquid hydrocarbon production and the liquid hydrocarbon productivity at $203^{\circ}C$ reached to $52.5ml/(kg_{cat}{\cdot}h)$, which was higher than that obtained by the Co-pellet. Furthermore, the heat-exchanger typed reactor was developed to efficiently control the highly exothermic reaction heat. The reaction heat generated in the FTS reaction on the cobalt active site was easily transferred to reactor wall by the metallic foam in the catalyst and the transferred reaction heat was directly removed by the hot oil which circulated the wall side of the heat-exchanger typed reactor.

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Synthesis of Polyurethane Foam at Room Temperature by Controlling the Gelling Reaction Time (겔화 반응 시간 조절을 통한 상온에서의 폴리우레탄 폼 합성)

  • Lee, Hojoon;Oh, Chungik;Liow, Chi Hao;Kim, Soyeon;Han, Youngjoon;Oh, Min-Seok;Joo, Hyeong-Uk;Chang, Soo-Ho;Hong, Seungbum
    • Applied Chemistry for Engineering
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    • v.31 no.6
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    • pp.630-634
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    • 2020
  • We developed a processing recipe to synthesize flexible polyurethane foam with a pore size of 335 ± 107 ㎛. The gelling reaction time was varied from 0 to 30 minutes and the physical properties of the foam were evaluated. The gelling reaction where the polypropylene glycol and tolylene 2,4-diisocyanate (TDI) were reacted to form urethane prepolymer, proceeded until a chemical blowing agent, deionized water, was introduced. Fourier transform infrared (FT-IR) spectra showed that the composition of the foam did not change but the foam height reached a peak value when the gelling reaction time was 10 minutes. We found that increasing the gelling time lessened the coalescence and helped the formation of cells. Lastly, the repeatability of polyurethane foam was confirmed by one-way analysis of variance (ANOVA) by synthesizing ten identical polyurethane foams under the same experimental conditions, including the gelling reaction time. Overall, the new time parameter in-between the gelling and blowing reactions will give extra stability in manufacturing identical polyurethane foams and can be applied to various polyurethane foam processes.

Hydrogen Production with High Temperature Solar Heat Thermochemical Cycle using CeO2/ZrO2 Foam Device (CeO2/ZrO2 Foam Device를 이용한 고온 태양열 열화학 싸이클의 수소 생산)

  • Lee, Jin-Gyu;Seo, Tae-Beom
    • Journal of the Korean Solar Energy Society
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    • v.34 no.6
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    • pp.11-18
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    • 2014
  • Two-step water splitting thermochemical cycle with $CeO_2$ foam device was investigated by using a solar simulator composed of 2.5 kW Xe-Arc lamp and mirror reflector. The hydrogen production of $CeO_2$ foam device depending on reaction temperature of Thermal-Reduction step and Water-Decomposition step was analyzed, and the hydrogen production of $CeO_2$ and $NiFe_2O_4/ZrO_2$ foam devices was compared. As a result, the amount of reduced $CeO_2$ considerably varies according to the reaction temperature of Thermal-Reduction step. and hydrogen production was not much when the amount of reduced $CeO_2$ decreased even if the reaction temperature of Water-Decomposition step was high. Therefore, it is very important to keep the reaction temperature of Thermal-Reduction step high in two-step thermochemical cycle with $CeO_2$.

Numerical analysis on foam reaction injection molding of polyurethane, part B: Parametric study and real application

  • 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.6
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    • pp.258-262
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    • 2016
  • Foam reaction injection molding (FRIM) is a widely used process for manufacturing polyurethane foam with complex shapes. The modified theoretical model for polyurethane foam forming reaction during FRIM process was established in our previous work. In this study, using the modified model, parametric study for FRIM process was performed in order to optimize experimental conditions of FRIM process such as initial temperature of mold, thickness of mold, and injection amount of polymerizing mixture. In addition, we applied the modified model to real application of refrigerator cabinet to determine optimal manufacturing conditions for polyurethane FRIM process.

Endothermic Properties of Liquid Fuel Decomposition Catalyst Using Metal Foam Support (메탈폼 지지체를 이용한 액체연료 분해반응 촉매의 흡열특성)

  • Mun, Jeongin;Kim, Nari;Jeong, Byunghun;Jung, Jihoon
    • Korean Chemical Engineering Research
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    • v.59 no.4
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    • pp.481-486
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    • 2021
  • In a hypersonic vehicle to solve the heat problem generated during flight, a cooling technology is being developed which uses the endothermic effect that appears during the decomposition reaction of the mounted fuel. In this study, the decomposition reaction of n-dodecane fuel was performed using HZSM-5 as a catalyst, and the catalyst was coated on metal foam to maximize the endothermic effect of the catalytic decomposition reaction and suppress coke formation. The reactor was a stainless steel flow reactor with a outer diameter of 1.27 cm, and the reaction temperature was 550 ℃, the reaction pressure was 4 MPa, and the flow rate was 12 ml per minute. As a result of the catalytic decomposition reaction using a catalyst coated with HZSM-5 on the metal foam, the heat sink was 2887 kJ/kg as a maximum, the gas phase conversion rate was 34%, and the amount of coke produced on the metal foam decreased by about 56% as the catalyst was coated compared to the uncoated catalyst.

Physical and Rheological Properties of Thermoplasticized Crosslinked-Polyethylene Foam in Supercritical Methanol

  • Cho, Hang-Kyu;Hong, Soon-Man;Baek, Kyung-Yeol;Koo, Chong-Min;Lee, Hong-Shik;Lee, Youn-Woo
    • Macromolecular Research
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    • v.17 no.12
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    • pp.950-955
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    • 2009
  • The physical and rheological properties of thermoplasticized irradiation-crosslinked polyethylene foam using supercritical methanol treatment were investigated by GPC, FTIR, DSC, WAXS, DMTA and UDS. The polyethylene foam was selectively decrosslinked into thermoplasticized polyethylene in an appropriate supercritical methanol condition without any undesirable side reactions such as oxidation and disproportionation. The thermoplasticization was promoted with increasing reaction temperature to reach completion above $380^{\circ}C$. The supercritical reaction condition affected the crystallization behavior, and mechanical and rheological properties of the decrosslinked polyethylene foam, but not its crystallographic structure or crystallinity.

Adhesion Enhancement of Solvent type and Water Soluble Adhesive Using Atmospheric Plasma (대기압 플라즈마를 이용한 용제형 및 수용성 접착제의 접착력 향상)

  • Jung, Young Sig;Seul, Soo Duk
    • Journal of Adhesion and Interface
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    • v.10 no.3
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    • pp.148-153
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    • 2009
  • An atmospheric plasma pre-treatment method was applied to PU foam, Leather (Action), Rubber to improve its adhesion using solvent and water soluble type pressure sensitive adhesion in atmospheric plate type reactor. In order to investigate the optimum reaction condition of plasma treatment, type of reaction gas (nitrogen), rate of gas flow (30~100 mL/min), and reaction time (0~30 s) were examined in a plate plasma reactor. The result of the surface modification with respect to the treatment procedure was characterized by using SEM. Due to a de-crease of the contact angle of various materials, the greatest adhesion strength was achieved at optimum condition such as flow rate of 100 mL/min, reaction time of 10 second for an atmospheric plasma treatment of the PU foam, EVA foam, Leather (Action) and Rubber also resulted in the improvement of the adhesion.

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