• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2011.11a
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• pp.25-25
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• 2011

폴리올레핀 섬유인 폴리프로필렌과 초고분자량 폴리에틸렌 섬유는 경량성, 속건성, 보온성, 고강도와 같은 여러 장점에도 불구하고 융점(폴리프로필렌: 약 $160^{\circ}C$, 초고분자량 폴리에틸렌: 약 $150^{\circ}C$)이 다른 섬유에 비해 낮아 내열성이 약하여 제품으로서의 가공공정이나 사용 시에 고온을 피해야 하는 주의를 필요로 하고, 곁가지가 거의 없어 섬유분자의 구조가 매우 조밀하며 탄소와 수소로만 이루어진 분자구조에 의한 극단적인 소수성성질은 현재 상용화되어 있는 염료와 염색방법으로의 후염 염색이 거의 불가능한 것으로 알려져 왔다. 이에 본 연구팀에서는 폴리프로필렌과 초고분자량 폴리에틸렌 섬유에 염색 가능한 청색염료를 합성하였다. 염료의 합성에는 leucoquinizarine과 alkylamine(hexyl, heptyl, octyl)의 1:2mole 반응을 이용하여 안트라퀴노이드 구조의 알킬기가 치환된 소수성 염료를 합성하였다. 합성된 염료를 섬유에 염색해본 결과 폴리프로필렌의 경우 농색의 색상강도를 나타냈으며 초고분자량 폴리에틸렌에서는 중색의 색상 강도를 보이는 것으로 확인되었다. 견뢰도 측면에서는 폴리프로필렌의 경우 세탁, 마찰 및 일광견뢰도에서 모두 4~5등급 우수한 결과를 보였다. 초고분자량 폴리에틸렌의 경우 4~5등급의 세탁, 마찰 견뢰도를 가지는 것으로 나타났고, 일광견뢰도는 3~4등급으로 비교적 낮게 나타났지만 공업적으로 널리 이용되는 분산염료에 의해 염색된 제품의 일광견뢰도와 비슷한 수준임을 알 수 있었다.

• Textile Coloration and Finishing
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• v.26 no.3
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• pp.173-180
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• 2014

Fall-arrest system have been widely applied to provide a safe stop during fall incidents for occupational activities. This research object to evaluate the energy capacity of fall arrest shock energy absorber lanyard in relation to the used super fiber. In this work, shock energy absorber lanyard was prepared using high tenacity PET, high tenacity PET/P-aramid and high tenacity PET/UHMWPE, respectively. Dynamic load and static load tests based on the Korea fall protection equipment standard(Korea Occupational Safety & Health Agency standard 2013-13) were conducted. Maximum arrest force by dynamic load test of shock energy absorber showed below 6,000N. Also, static strength by static load test of lanyard and rope remains 15,000N and 22,000N for 1 min.

• Textile Coloration and Finishing
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• v.26 no.2
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• pp.106-113
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• 2014

Work-related falls are a major problem in the construction and roofing industries. To avoid serious injury to the worker caused by high decelerations or forces, different systems to absorb the energy of a fall are implemented in personal protective equipment. In this study, shock energy absorber lanyard protection tube was prepared using high tenacity PET fiber, P-aramid fiber, and UHMWPE fiber, respectively. Dynamic load test and static load test, bursting strength test based on the Korea fall protection equipment standard(Korea Occupational Safety & Health Agency standard 2013-13) or conformity European safety test(CE : EN355) were conducted. Especially maximum arrest force by dynamic load test of energy absorber showed below 6,000N.

• Tribology and Lubricants
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• v.39 no.6
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• pp.235-243
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• 2023

This paper presents the fabrication process of water-lubricated plastic bearings. Plastic bearings require good mechanical properties and tribological properties as well as elasticity and shock resistance, especially when lubricated in dirty water conditions. In this study, sleeve-type plastic bearings are produced by winding a prepreg sheet, which primary contains nitrile rubber (NBR)-modified epoxy, self-lubricating fillers, and various types of lattice-structured reinforcing fibers such as carbon, Aramid, and polyethylene terephthalate. A thermosetting epoxy is chemically modified with NBR to impart elasticity and low-friction characteristics in water conditions. Experimental investigations are conducted to examine the mechanical and tribological characteristics of the developed bearing materials, and the results are compared with the characteristics of a commercial plastic bearing (Thordon SXL), well known as a water-lubricated bearing. A Thordon bearing (mainly composed of polyurethane) exhibits an extremely low load-bearing capacity and is thus only suitable for medium loading (1~10MPa). The tribological characteristics of the test materials are evaluated through Falex block-on-ring (LFW-1) friction and wear tests. The results indicate that friction exhibited by the carbon-fiber-reinforced NBR-10wt.%-modified epoxy composite material, incorporated with the addition of 20wt.% UHMWPE and 6wt.% paraffin wax, is lower than that of the Thorden bearings, whereas its wear resistance surpass that of Thorden ones. Because of these features, the load carrying capacity of the fabricated composite (>10MPa) is higher than that of the Thorden bearings. These results confirm the applicability of water-lubricated plastic bearing materials developed in this study.