• Journal of the Korean Society of Propulsion Engineers
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• v.24 no.5
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• pp.84-90
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• 2020

The adhesion strength of two konds of solid propellants(primary propellant/secondary propellant) was studied by coating agent of adhesion composition composed of organic solvent, curing agent, and cure catalyst. The coating agent using FeAA, cure catalyst, resulted propellant breaking at more 0.14 wt% and interface breaking at less 0.10 wt%. The TPB cure catalyst of confirmed the result of the interface breaking immediately after curing of the secondary propellant. In addition, the coating agent using TPB was found to increase the adhesion strength between the primary propellant and the secondary propellant over time.

• Proceedings of the KAIS Fall Conference
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• 2000.10a
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• pp.237-240
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• 2000

본 연구에서는 비스페놀 A, 에피크로로히트린을 반응시킨 에폭시 기본주제를 중심으로 경화제, 희석제, 충진제, 촉매 등을 배합하여 토목, 건축용 반고체형 에폭시 접착제를 개발하였다. 여기서 특히 에폭시 주제와 희석제의 종류 및 배합비율에 따른 기본 물성, 접착성능 등을 측정하였다. 상온 경화 특성을 측정하기 위하여 경화시 간을 측정한 결과 희석제의 종류와 관계없이 희석제의 양이 증가할수록 경화시간이 증가하고 경화온도도 증가하는 경향을 알 수 있었으며 촉매의 양이 적을 경우가 경화시간이 빠른 것을 알 수 있었다. 또한 경화 시간은 30분 내지 40분 정도로 상온에서 사용할 수 있을 것으로 기대한다. 접착력 시험 결과는 촉매의 양이 적당한 때 가장 좋은 접착력을 나타내고 희석제 중에서 HDGE의 경우가 가장 좋은 접착력을 나타내었고 희식제의 양이 증가할수록 접착력은 증가하였다. 실리카와 철분을 섞어 반고체형 에폭시 접착제를 제조한 경우 기존의 제품보다 우수한 접착력을 나타내었다. 따라서 본 연구에서 개발한 반고체형 접착제는 제조공정 코스트 등에 대한 검토와 함께 제품화하여 토목, 건축 분야의 콘크리트 균열 접착, 볼트와 콘크리트의 접합, 목재의 접합 등에 간편하게 사용될 수 있으며, 배합물질과 비율에 따라 전기전자. 토목건축, 자동차산업 등의 산업용 접착제로서 응용될 수 있을 것으로 기대된다.

• Composites Research
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• v.17 no.4
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• pp.40-46
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• 2004

A single lap shear test was used to investigate the effects of the ratio of a catalyst to a self-healing agent and curing temperature on the bond performance of autonomic polymer composites. DCPD (dicyclopentadiene), ENB (5-ethylidene-2-norbornene), and their mixture were used as self-healing agents and bis(triclohexylphosphine) benzyllidine ruthenium (IV) dichloride Grubbs' catalyst was used as a catalyst. During the experiments, the catalyst ratios of 1.0wt% and 0.5wt% were applied to DCPD, the catalyst ratio of 0.lwt% was applied to ENB, and the catalyst ratio of 0.5wt% was applied to the mixtutes of DPCD and ENB. In addition, the curing temperatures of $25^{\circ}C$, $60{\circ}C$, and $80^{\circ}C$ were considered. According to the results, the higher catalyst ratio and the longer curing time were required to obtain more stabilized bond shear strength of DCPD. ENB with a lower catalyst ratio was cured faster than DCPD. Unlike DCPD, ENB stabilized after a steady fall from its peak as the curing time increased. Moreover, the mixtures of DCPD and ENB revealed similar curing behavior to ENB, but the increase in mixture ratio of ENB to DCPD caused curing process to be faster. Also the increase in curing temperature caused the bond shear strength to be higher and the curing time to be quicker.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1997.04a
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• pp.215-220
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• 1997

본 연구는 추진제 연소관 내부에 도포 되는 내열재 라이닝 공정을 최적화하기 위해 라이너 Premix 반응성을 실험하고 그결과를 토대로 Premix 저장조건을 설정하였다. HX-계열의 Bonding agent를 사용하는 LH-2, LH-5, LH-6 라이너를 선택하여 각각 20, 30, $40^{\circ}C$하에서 5주간 저장후 경화제와 경화촉매를 주입하고 초기점도를 측정하여 반응성을 예측하였다. 그 결과 Bonding agent로 HX-868을 사용하는 LH-5, LH-6 라이너가 HX-752를 사용하는 LH-2보다 반응성이 빠르며, 경화제와 경화촉매로 DDI와 T-12를 사용하는 LH-5 라이너가 IPDI와 $Fe(AA)_3$를 사용하는 LH-6 라이너 보다 반응성이 빠르게 나타났다. 이러한 저장온도와 기간에 따른 반응성을 토대로 공정 적용시 급격한 점도 상승에 의한 작업의 불안정성을 피하기 위해 일정 점도를 초과하지 않는 라이너 Premix 저장조건을 설정하였고, 향후에는 Bonding agent로. HX-868을 사용하는 LH-5, LH-6 라이너는 보다 공정성이 양호한 HX-752로 바꾸어 주는 것이 바람직 할 것이다.

• Journal of the Korean Society of Propulsion Engineers
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• v.26 no.6
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• pp.28-33
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• 2022

In this study, the curing characteristics of commonly used Hydroxyl terminated polybutadiene(HTPB)-based solid propellant according to the curing temperature and Equivalent ratio change were investigated. In addition, the effect of curing reaction according to their ratio and content in the Triphenyl bismuth(TPB), Maleic anhydride(MA) and Magnesium oxide(MgO) catalyst systems was confirmed. Finally, moisture was added for each propellant mixing process to check the effect of moisture on propellant curing.

• Journal of the Korean Applied Science and Technology
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• v.35 no.1
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• pp.151-156
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• 2018

As industry and medicine developed, many people became interested in the quality of life. As the concern for health became higher, vegetarian or vegetable oils became more popular than meat. With the development of processes primarily using nickel catalysts today, the shelf life of vegetable oils has increased and mobility has become more convenient. Currently nickel catalysts for the curing of oil are dominated by foreign companies in the world market. On the other hand, the mass production technology of domestic nickel catalyst is backward, and the entire amount is imported from foreign countries. Therefore, there is a need for active research and development of a catalyst that can be commercialized in korea. In this study, nickel as a main active catalyst was used as a base for hydrogen curing reaction, and the effect of rare earth on catalytic activity was investigated. A certain amount of rare earths could induce the dispersion of nickel to increase efficiency and use as co-catalyst.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2001.04a
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• pp.109-109
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• 2001

• Applied Chemistry for Engineering
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• v.5 no.4
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• pp.743-747
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• 1994

The catalytic effects of carboxylic acid and dibutyltin dilaurate(DBTL) on the curing rate of acrylic polyol with isocyanate prepolymer were investigated. In this work reaction of a biuret type aliphatic isocyanate with acrylic polyol follows the second order reaction in the thin film state. Carboxylic acid of acrylic polyol has a strong catalytic effect on the isocyanate groups and influences greatly on curing rate, also DBTL is more effective catalysis on acrylic polyol without carboxylic acid than with carboxylic acid.

• Korean Journal of Materials Research
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• v.5 no.5
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• pp.606-610
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• 1995

Diglycidyll ether of bisphenol A(DGEBA)/4, 4'-methylene dianiline(MDA)계에 반응성 첨가제 malononitrile(MN)을 첨가하면 내충격성은 크게 향상되나 반응속도는 감소하게 된다. 에폭시 수지의 경화반응은 에폭시기가 개환되어 생성되는 히드록시기가 촉매로 작용하는 자촉매 반응이며, 외부에서도입된 히드록시기도 같은 효과를 나타낸다. 따라서 본 연구에서는 DGEBA/MDA/MN 계의경화 반응속도를 증가시키기 위해 히드록시기를 가진 촉매로서 hydroquinone(HQ)을 도입하였고 이들 계의경화특성 및 열적성질을 고찰하였다. HQ가 첨가됨으로 인해 활성화 에너지는 감속하고 속도상수는 증가하였으며, 발열곡선에서 반응 시작온도가 낮아졌다. 이 결과로부터 HQ가 반응 가속제로 작용하고 있음을 알 수 있다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2008.11a
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• pp.231-236
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• 2008

The well-defined copolymers derived from Epichlorohydrin(ECH), Tetrahydrofuran(THF) were synthesized by Cationic ring-opening polymerization(CROP) with 1,4-Butandiol, a initiator, and $BF_3THF$ Complex, a catalyst via Activated monomer mechanism, which could lead to hydroxyl-terminated polyethers. The molecular weight of polymers were dependant on the ratio of [monomer]/[diol], Copolymer structures were controlled by monomers feed ratio, ECH and THF added. This polymers were functionalized from Chlorine group to Azide group using $S_N2$ reaction. Synthesized polymers were found to be as the prepolymer for polyurethane. Polyurethane was synthesized in the presence of N-100/IPDI mixture, a curing agent, and TPB(triphenyl bismuth)/MA(Maleic anhydride) mixture, a catalyst system. The curing behavior and mechanical properties of polyurethane after mixing with various prepolymer’s composition and the molecular weight were studied.