• 제목/요약/키워드: Melamine

검색결과 235건 처리시간 0.029초

Preparation and characterization of Melamine-Formaldehyde Resin Microcapsules Containing Fragrant Oil

  • Hwang, Jun-Seok;Kim, Jin-Nam;Wee, Young-Jung;Yun, Jong-Sun;Jang, Hong-Gi;Kim, Sun-Ho;Ryu, Hwa-Won
    • Biotechnology and Bioprocess Engineering:BBE
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    • 제11권4호
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    • pp.332-336
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    • 2006
  • In this study, melamine-formaldehyde microcapsules were prepared via in situ polymerization using peppermint oil as a core material, melamine-formaldehyde as the wall material, Tween 20 as the emulsifier, and poly (vinyl alcohol) as a protective colloid. The melamine-formaldehyde microcapsules prepared in this study were then evaluated with regard to their structures, thermal properties, particle size distributions, morphologies, and release behaviors.

Mini-review: 멜라민에 의한 신요로계 결석 (Mini-review; Melamine-related Urinary Stone Disease)

  • 강희경
    • Childhood Kidney Diseases
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    • 제13권1호
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    • pp.21-25
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    • 2009
  • 2008년 말 발생한 멜라민 파동은 멜라민에 오염된 분유를 섭취한 영아들에서 요로계 결석이 발생한 것으로부터 비롯되었다. 멜라민 관련 요로계 결석의 위험인자는 3세 미만의 나이, 많은 멜라민 섭취량과 탈수, 요산의 요 배설량 증가 등의 일반적인 요로계 결석 위험인자의 동반이다. 멜라민 관련 결석은 주 성분이 요산이므로 수분 공급과 소변 알칼리화의 보존적인 치료로 회복되는 경우가 대부분이다.

불소수지를 이용한 분할형 PET/nylon 직물의 발수가공 (Water Repellent Finish for Divided Type PET/Nylon Fabrics with Fluoro Alkyl Resin)

  • Lee, Bang One;Pak, Pyong Ki;Cheong, Yun Suk;Lee, Hwa Sun
    • 한국염색가공학회지
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    • 제9권4호
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    • pp.1-6
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    • 1997
  • Water repellent finish was carried out using water repellent agent(AG-480), melamine resin(Sumitex Resin MK), and catalyst(Sumitex Accelerator ACX). PET/nylon fabrics were treated with melamine resin by pad-dry-cure method and subsequently washed and dried. Durable water repellency was controlled by the melamine resin and catalyst. Water repellency was tested by spray rating method and durability of water repellency were measured by launder-O-meter and pilling tester. The optimum conditions of durable water repellent finish for new synthetic fabric were as follows; concentration of water repellent finishing agent 20g/l; concentration of melamine & catalyst 0.5g/l; curing condition $160^{\circ}$ ${\times}$ 30sec. Water repellency after washing and rubbing is improved by melamine resin and catalyst.

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아민류와 포르말린 혼합액에 의한 실크 생사의 세리신 정착에 관한 연구 (A Study on the Sericin Fixation of Raw Silk Fibers by Fixing with the Mixtures of Various Amines and Formalin)

  • 박건용
    • 한국염색가공학회지
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    • 제21권1호
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    • pp.67-72
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    • 2009
  • To investigate the strong and effective sericin fixing agents and conditions, raw silk fibers were treated with the mixtures of urea-formalin, thiourea-formalin and melamine-formalin as sericin fixing agents, respectively. And the treated raw silk fibers were degummed by the degumming liquors of alkaline detergent and sodium carbonate to confirm the hardness of sericin fixation. The weight of raw silk fibers was decreased in the process of sericin fixation treating at 80$^{\circ}C$ for 60min. The effective sericin fixation was obtained by treating at $60{\sim}80^{\circ}C$ for 15min with the mixture of melamine and formalin. The mixture of melamine and formalin showed an outstanding ability of sericin fixation because the three amino groups of melamine were able to cross-link the hydroxy amino acids of sericin such as serine with the assistance of formalin.

GC/MS를 이용한 담배연기중 Melamine과 Cyanuric Acid 분석 (Analysis of Melamine and Cyanuric Acid in Cigarette Mainstream Using GC/MS)

  • 곽호근;이수현;임흥빈
    • 한국연초학회지
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    • 제31권2호
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    • pp.107-114
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    • 2009
  • In this study, we investigated the existence of melamine and cyanuric acid in cigarette smoke because leaf tobacco contains lots of nitrogen compounds and they are capable of pyrolytic synthesis while smoking. The extraction and derivatization conditions of two compounds were performed according to the procedure of U.S. Food and Drug Administration(FDA). Ky3R4F as reference cigarette was smoked on ISO condition(Puff volumne : 35 ml, duration : 60 sec, Interval : 2 sec). Compared with the results Ky3R4F and standard solution, retention time of two compounds was not corresponded. As a result, we concluded that melamine and cyanuric acid were not existed in cigarette smoke.

요소(尿素)·멜라민·페놀공축합수지(共縮合樹脂)가 합판(合板)의 재질(材質)에 미치는 영향(影響) (Effects of Urea-Phenol-Melamine Copolymer Adhesive on the Plywood Qualities)

  • 이화형;홍승도
    • Journal of the Korean Wood Science and Technology
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    • 제12권1호
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    • pp.38-43
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    • 1984
  • Water soluble urea-melamine-phenol copolymer adhesive manufactured with 80 percent of urea resin contents was manufactured by different molar ratio for a high temperature curing type, and their properties and strengthes were examined through manufactures of plywood with Kapur (Dryobalanops spp.) veneers. The results are summarized as follows: 1. Specific gravities of air dried plywood manufactured from each adhesive ranged from 0.78 to 0.84 and their moisture contents met the KS requirement. 2. In dry and wet shear strength, $U_{80}M_{10}P_{10}$ copolymer resin showed the highest value and urea resin was the lowest, indicating that melamine and phenol were effective for increasing glue shear strength of urea resin. 3. In case of glue shear strength after boiling test, phenolic resin was the nest and melamine was not so effective as phenol on reinforcement of boiling water resistance of urea resin.

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A Method of Measuring Wood Failure Percentage of Wood Specimens Bonded with Melamine-Urea-Formaldehyde Resins Using I mage Analysis

  • KIM, Minseok;PARK, Byung-Dae
    • Journal of the Korean Wood Science and Technology
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    • 제49권3호
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    • pp.274-282
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    • 2021
  • Transparent and colorless melamine-urea-formaldehyde (MUF) resins make it difficult to identify the area of wood failure percentage (WFP) in the fracture surface of bonded wood specimens. Therefore, in this study, we develop a method of measuring WFP after the adhesion strength measurement of MUF resins under shear stress. The fractured wood surface of b lock shear strength (BSS) specimens bonded with cold-setting MUF resins at three melamine contents (20%, 30%, and 40%) was marked black, and then, WFP was accurately measured via image analysis. WFP values measured using this method consistently increased with BSS as the melamine content increased, showing the reliability of this new method. The results suggested that this new method is useful and reliable for measuring the WFP of the fracture surface of wood specimens bonded with colorless adhesives such as urea-formaldehyde, MUF, and melamine-formaldehyde resins.

Melamine계 난연제를 이용한 Nylon6의 난연성 및 물리적 특성 평가 (Evaluation of mechanical properties and non-flammability of Nylon6 using melamine-based halogen-free flame retardant)

  • 김동학;류관석;손영곤
    • 한국산학기술학회논문지
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    • 제7권4호
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    • pp.743-748
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    • 2006
  • 본 논문에서는 연구에서는 Nylon6를 기재로 하여 두 가지 Melamine계 난연제(melamine cyanurate: MC-100 and melamine phosphate:MPP-100)를 사용한 난연 Nylon를 개발하여 난연성 및 물성평가를 수행하였다. 난연Test는 UL-94 측정방법(수직연소 시험방법)을 이용하였고, 물성평가는 만능물성시험기(UTM)를 이용하여 인장강도, 굴곡강도, 굴곡탄성율 등을 측정하였고, 충격강도 시험기를 이용하여 충격강도를 측정하였다. 또한 Nano-clay(Cloisite 30B) 5wt%를 사용하여 물성에 미치는 효과를 관찰하였다. 수지의 난연성 평가결과에 의하면, 난연제의 함량이 5wt% 이상이면 V0급을 얻을 수 있었다. 난연제 함량이 증가함에 따라 인장강도. 굴곡강도는 감소하고, 굴곡탄성율은 증가하였다. MC-100의 경우, 5wt%까지는 Nylon6의 동등 이상의 물성을 유지하였다. Nano-clay의 경우, 분산 상태가 불량하여 기대 수준의 물성 향상과 난연 효과는 얻지 못했다.

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폴리카보네이트 판 위에 Silicates와 Melamine 유도체의 졸-겔 반응을 이용한 하드 코팅 (Hard Coatings on Polycarbonate Plate by Sol-Gel Reactions of Silicates and Melamine Derivative)

  • 김세라;강민경;신영재;오미혜;윤여성;신재섭
    • 폴리머
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    • 제31권6호
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    • pp.485-490
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    • 2007
  • 자동차의 유리를 폴리카보네이트로 대체하기 위하여 폴리카보네이트 판 위에 멜라민 유도체와 실리케이트를 이용하여 졸-겔 과정으로 하드 코팅을 시도하였다. 본 연구에서는 methylated poly(melamine-co-formaldehyde), tetraethoxysilane, phenyltriethoxysilane 등으로부터 졸-겔 과정으로 코팅을 형성하였다. 코팅을 실시하기 전에 코팅의 접착력을 향상시키기 위하여 poly(methyl methacrylate)를 사용하여 폴리카보네이트판 위에 전처리 코팅을 하였다. 가장 우수한 코팅 물성을 나타내는 코팅의 최적 조건을 찾아보았다. 멜라민 유도체를 첨가하였을 때 연필 경도가 증가하였다. 형성된 코팅은 연필 경도 3H의 경도를 나타내었으며, 매우 고른 코팅 표면을 갖고 있었고, 매우 우수한 내마모성을 나타내었다.

생체시료 중 멜라민 화합물의 미량분석법 개발연구 (Establishment of Analytical Methods for Melamine Related Compounds in Biological Samples)

  • 한경문;김진호;조수열;심선보;이진희;이지현;황의선;김성일;조양하;채갑용;권순재;이준호
    • 한국식품위생안전성학회지
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    • 제26권2호
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    • pp.125-141
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    • 2011
  • 본 연구에서는 비료나 수지의 원료물질로 알려진 멜라민이 최근 수입식품 및 가공식품 등에서 검출되어 국제적으로 문제가 되어 생체시료 중 멜라민의 분석법을 확립하고 벨리데이션을 실시하여 신뢰성을 확보하고자 하였다. 생체시료(뇨 및 혈액) 중 멜라민 및 시아누르산 분석을 위해 단백질 침전법, 액체상 추출법으로 불순물을 제거하였고 LC/MS를 이용한 멜라민 최적분석법의 벨리데이션 결과에서 검출한계는 0.2 ng/mL(멜라민), 2.0 ng/mL(시아누르산)이었으며 각 정량범위내의 직선성은 0.9990이상을 가졌다. 뇨및 혈 중 멜라민의 quality control 시료는 0.5 ng/mL, 0.8 ng/mL, 2.0 ng/mL, 3.0 ng/mL으로서 뇨 중 멜라민 및 시아누르산의 정확성은 91.6%-107.6%범위를 나타내었고 정밀성은 2.0%-11.8%으로 나타났다. 혈 중 멜라민 및 시아누르산의 정확성은 94.9%-119.0%범위를 나타내었고 정밀성은 3.7%-13.5%으로 나타났다. 또한, GC/MS를 이용한 멜라민 분석의 검출한계는 5.0 ng/mL(멜라민), 5.0 ng/mL(시아누르산)이었고, 뇨 및 혈중 멜라민의 quality control 시료는 10.0~40.0 ng/mL이었으며, 뇨 및 혈 중 멜라민 및 시아누르산의 정확성은 83.7%~ 10.7% 범위를 나타내었고, 정밀성은 3.5%-13.8% 으로 나타났다.