• Title/Summary/Keyword: 에폭시화

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Development of Epoxy Injection Machine for Electronic Lighters (전자라이터용 에폭시 정량 공급장치의 개발)

  • Park, Jung-Su;Jung, Won;Chang, Seok-Jin
    • Proceedings of the Korea Society for Industrial Systems Conference
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    • 2000.05a
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    • pp.95-99
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    • 2000
  • 본 연구는 전자라이터용 에폭시 정량공급장치의 개발에 관한 것으로써 기존의 수작업에 의한 생산을 자동화함으로 하여 품질의 균일화를 도모하고 또한 납기준수를 위한 생산성향상에 기반을 둔 개발로서 전자라이터의 핵심 부품이라고 할 수 있는 Piezo igniter 절연부에 에폭시를 정량으로 주입할 수 있게 함으로서 품질 및 생산목표를 달성하고 기업의 이윤을 극대화하는데 초점을 맞추었다.

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Effects of Thermal and Electrical Conductivity of Al(OH)3 Functionalized Graphene/Epoxy Composites by Simple Sol-Gel Method (졸-젤 법을 이용한 Al(OH)3 처리된 그래핀/에폭시 복합체의 열 및 전기전도 특성 분석)

  • Kim, Ji-Won;Im, Hyun-Gu;Han, Jung-Geun;Kim, Joo-Heon
    • Polymer(Korea)
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    • v.36 no.1
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    • pp.22-28
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    • 2012
  • Functionalized graphene/epoxy composites were prepared to miprove thermal conductivities of epoxy composites and to maintain electrical insulating property. Graphene oxide (GO) was prepared using Hummers method, and then GO was reacted with aluminum isopropoxide to functionalize $Al(OH)_3$ layer onto GO surface by a simple sol-gel method (Al-GO). GO and Al-GO were characterized by X-ray photoelectron spectroscopy, field emission scanning electron microscopy and transmission electron microscopy. The analyses confirm that GO was coated with a large and dense coverage of $Al(OH)_3$. GO and Al-GO (1 and 3 wt%) were embedded in bisphenol A (DGEBA) to investigate the effects of electrical insulating property. Electrical resistivity showed that Al-GO had better insulating property than GO. Further, the thermal conductivity of GO and Al-GO/epoxy composites was higher than that of neat epoxy resins. In particular, the thermal conductivity of Al-GO/bisphenol F (DGEBF) improved by 23.3% and Al-GO/DGEBA enhanced by 21.8% compared with pure epoxy resins.

Properties of Epoxy-Modified Mortars with Alkali Activators and Ground Granulated Blast Furnace Slag (알칼리자극제 및 고로슬래그미분말을 병용한 에폭시수지 혼입 폴리머 시멘트 모르타르의 성질)

  • Kim, Wan-Ki
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.25 no.1
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    • pp.85-92
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    • 2021
  • The purpose of this study is to investigate the properties of hardener-free epoxy-modified mortars(EMMs) using ground granulated blast furnace slag(GGBFS) and alkali activators. The hardener-free EMMs with a GGBFS content of 20% using 4 types of alkali activators were prepared with various polymer-binder ratios, and tested for strengths, water absorption, carbonation depth, chloride ion and H2SO4 penetration depth. The conclusions obtained from the test results are summarized as follows: The compressive strength of the EMMs with a GGBFS content of 20% attains a maximum at a polymer-binder ratio of 10%. The flexural strength of the hardener-free EMMs using Ca(OH)2 as a alkali activator is improved with increasing polymer-binder ratios. However, the flexural strength of the EMMs using NaCO3, Na2SO4 and Li2CO3 is gradually decreased with increasing polymer-binder ratios. Regardless of the type of alkali activator, the water absorption, chloride ion penetration and carbonation depth are remarkably decreased with increasing polymer-binder ratios due to the epoxy film formed in the EMMs. The H2SO4 penetration depth of the hardener-free EMMs with a GGBFS content of 20% is gradually increased with increasing polymer-binder ratio. In this study, the properties of hardener-free EMMs using Ca(OH)2 as a alkali activator are more excellent than those of other alkali activators.

Carbonization of Pitch-coated Glass Fibers on Thermal Conductivity of Epoxy Composites (피치 코팅된 유리섬유의 탄화가 에폭시 복합재료의 열전도도에 미치는 영향)

  • Beom, Seung-Won;Lee, Seul-Yi;Lee, Ji-Han;Park, Sang Hee;Park, Soo-Jin
    • Composites Research
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    • v.26 no.5
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    • pp.315-321
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    • 2013
  • In this work, pitch-carbonized glass fibers were prepared for reinforcement of composites. The influence of acid functionalization of the fibers on the morphological, mechanical, and thermal properties of fiber-reinforced epoxy matrix composites was investigated. The acid functionalization of the fibers led to 10 and 150% increases in the mechanical and thermal properties, respectively, as compared to carbon fiber-reinforced composites. This can be attributed to the superior orientation of fiber structures and good interfacial interactions between fillers and epoxy matrix, resulting in enhanced degree of dispersion and formation of thermally conductive paths in the functionalized composites.

Design and Characterization of Low Viscosity Epoxy Based on Flame Retardant Phosphorus Epoxy (난연성 인계 에폭시를 기반으로 한 저점도 에폭시 설계 및 특성 분석)

  • Park, Jun-Seong;Woo, Je-Wan
    • Applied Chemistry for Engineering
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    • v.32 no.4
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    • pp.449-455
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    • 2021
  • Composite materials are substances that are configured to have excellent physical properties by combining the properties of a single substance, and are in the limelight as materials that exceed the performance of metals and polymers. However, it has the disadvantages of long cycle time and high unit price, and much research is being performed to overcome these disadvantages. In this study, we developed an epoxy resin curing agent that can shorten the time required for mass production of composite materials, and tried to expand the applicability of objections by imparting flame retardancy. The epoxy resin used as a basic substance utilized two types of bisphenol F and resorcinol structure, which was further modified using 9,10-dihydro-9-oxa-10-phosphaphenantrene-10-oxide (DOPO) to impart flame retardancy. Triethylphosphate (TEP) and bis [(5-ethyl-2-methyl-1,3,2-dioxaphosphorinan-5-yl)methyl] methyl phosphonate P,P'-dioxide (FR-001) were used as additives, seven kinds of compositions were blended, thermal characteristics (gelation time, glass transition temperature) and flame retardant performance were evaluated. We successfully developed an epoxy matrix that can be applied to high pressure resin transfer molding (HP-RTM) process.

Selective Reduction of ${\alpha},\;[\beta}$-Epoxy Ketones with Zinc Borohydride (수소화붕소 아연에 의한 에폭시케톤의 선택환원)

  • Nung Min Yoon;Jahyo Kang
    • Journal of the Korean Chemical Society
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    • v.19 no.5
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    • pp.355-359
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    • 1975
  • Reduction of epoxy ketones with zinc borohydride proceeds selectively to the corresponding epoxy alcohols in good yields. Thus we obtained 3,4-epoxy-4-methyl-2-pentanol($79.8{\%}$), trans-isophorol oxide ($89.5{\%}$), trans-2-benzal-cyclohexanol oxide ($84.1{\%}$) and trans-chalcol oxide ($97.9{\%}$, crude) from the corresponding epoxy ketones.

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Design/Manufacturing/Test of Curved Actuator LIPCA Composed of Piezoelectric Ceramic and Fiber Composite Layers (압전 세라믹과 섬유복합재료 층으로 구성된 곡면형 경량 작동기 LIPCA의 설계/제작 및 성능시험)

  • Sin, Seok-Jun;Kim, Ju-Sik;Gu, Nam-Seo;Park, Hun-Cheol;Gwak, Mun-Gyu;Yun, Gwang-Jun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2000.06a
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    • pp.1268-1272
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    • 2000
  • 본, 논문에서는 카본/에폭시, PZT 세라믹 박판, 글래스/에폭시 층으로 이루어진 곡면형 복합재료 작동기(LIPCA)의 설계, 제작 및 성능실험에 대한 연구 성과를 제시하고 있다. LIPCA의 큰 요점은 기존 THUNDER의 성능을 유지하면서 이를 경량화 하기 위하여 THUNDER의 금속 층을 상대적으로 가벼운 섬유 강화 복합재료로 대체하는 것이다. 이러한 경량화 작업으로 LIPCA는 기존 THUNDER 보다 약 $30{\sim}40%$ 정도의 무게를 감소시킬 수 있으며, 복합재료의 특성에 따라 설계의 유연성을 가질 수 있는 장점이 있다. 또한, 에폭시 수지를 사용함으로써 접착제 없이 평판 몰드에서 오토클레이브에서 $177^{\circ}C$로 경화되어, 탈형된 후 충분한 곡률을 형성하였다. 작동 성능 실험에서, LIPCA는 기존 THUNDER보다 작동변위가 향상됨을 보였다.

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Crosslink Density and Dynamic Mechanical Characteristics of Epoxy-Nanocomposites according to Silane Treatment (실란처리에 따른 에폭시-나노콤포지트의 가교밀도 및 동적기계적특성 연구)

  • Park, Jae-Jun;Kim, Jong-Min;Lee, Dae-Kyoon;Baek, Kwan-Hyun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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    • pp.255-255
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    • 2009
  • 에폭시수지에 유기화된 층상실리케이트 나노입자를 충진하여 에폭시-나노콤포지트 제조하였다. 에폭시-나노콤포지트는 열적, 기계적 특성이 매우 우수한 콤포지트로서 실란처리에 따른 동적 기계적 특성 (Dynamic Mechanical Analysis)과 가교밀도와의 관계를 조사였다. 나노입자의 충진함량은 3wt%로 충진하였고, Silane Coupling Agent는 에폭시실란으로서 3-Glycidoxypropyltrimethoxysilane이 사용되었다. 실란처리함량은 0.5, 1, 1.5 wt%로서 적용하여 제조된 샘플이다. DMA Storage modulus특성으로 glass state($40^{\circ}C$)에서는 원형에폭시의 경우 2054, 실란처리되지 않은 나노콤포지트 3967, 실란처리된 나노콤포지트는 4867MPa을 나타내었다. rubbery state($140^{\circ}C$)에서는 원형에폭시의 경우 1458, 실란처리되지 않은 경우 2506, 실란처리된 나노콤포지트는 2638MPa을 나타내었다. 또한 실란처리함량에따른 가교밀도변화는 0.5wt%에서는 0.803, 1 wt%에서는 0.671, 1.5wt%에서는 $0.762[mol/cm^3]$이로서 에폭시원형과 실란미처리된 나노콤포지트 그리고 실란처리된 나노콤포지트순으로 glass state와 rubbery state에서의 특성이 크게 향상된 결과를 얻었다. 이는 실란이 고분자와 무기물사이의 결합력을 강화시켜 열적기계적 특성향상을 가져 오는 것으로 볼 수 있다. 가교밀도의 실란처리함량의 변화에 있어서 과량의 함량 첨가는 에폭시와 나노층상실리게이트 표면처리된 잔유량이 오히려 특성의 저하를 가져오는 것으로 볼 수 있다.

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Effect of Polyurethane on Fracture Toughness in CTBN/PU/Epoxy (CTBN/PU/Epoxy의 파괴인성에서 폴리우레탄의 영향)

  • Kim, Jong Seok;Hong, Suk Pyo
    • Applied Chemistry for Engineering
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    • v.9 no.2
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    • pp.172-176
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    • 1998
  • Epoxy adduct carboxyl terminated butadiene acrylonitrile(CTBN) was prepared by blending of CTBN and epoxy resin. CTBN/PU/epoxy was prepared from polyurethane(PU), epoxy resin, and CTBN. The CTBN/PU/epoxy using 5 wt% of CTBN content showed shifting damping peak as PU content increased. It suggested that CTBN/PU/epoxy had good compatibility for all composition at 5 wt% of CTBN content. But miscibility of CTBN/PU/epoxy decreased with the increase of the CTBN content. PU content for maximum flexural properties of CTBN/PU/epoxy was 10 wt%, but decreased with the increase of the PU content. The fracture toughness of CTBN/epoxy was improved by addition of the PU. Fracture surfaces of CTBN/PU/epoxy showed the shear deformation and generation of stress whitening which is associated with the cavitation. Cavitation in the CTBN and shear defomation in the PU modified epoxy matrix are the toughening mechanisms for CTBN/PU/epoxy.

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Recent Trend for Performance Improvement of Epoxy Resin (에폭시 수지의 물성 향상을 위한 최근 동향)

  • Jang, Jyong-Sik
    • Applied Chemistry for Engineering
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    • v.2 no.4
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    • pp.301-310
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    • 1991
  • Epoxy resins have been widely used for many applications along with good processibility. However, epoxy resin systems have poor hot/wet performance properties and brittleness after resin curing and have limited to apply for environmental resistant materials. In order to improve the toughness of epoxy resin, this review article deals with incorporation method of rubber and high performance thermoplastics into the matrix resin. In addition, molecular design of epoxy resin and modification of thermoplastic have been introduced for improving hot/wet properties of epoxy resin.

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