• 제목/요약/키워드: Water-paint

검색결과 131건 처리시간 0.03초

본질안전방폭용 BARRIER에 관한 연구 (A Study on the Barrier of Intrinsic Safety Type)

  • 오진석
    • Journal of Advanced Marine Engineering and Technology
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    • 제28권6호
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    • pp.938-945
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    • 2004
  • Intrinsic safety is generally considered the safest method of operating electrical instrumention in potentially explosive atmospheres. The method of intrinsic safety limits the energy passing into the hazardus area. The energy limitation is provided by the use of safety barriers which are mounted in the safe area. Because of the energy limitation, regardless of the fault in the hazardous area, sufficient energy cannot be released to ignite the explosive atmosphere. The following industries are known to have hazardous locations: chemical. munitions, petrochemical, auto(paint spray booths), grain, waste water, printing, distillers, pharmaceutical. breweries, cosmetics, and utilities. In this paper, a isolator type barrier for ship(LNG, LPG, etc,) and test equipment confidence are proposed. The test equipments are designed for mechanical electrical life time test and vibration. All of test results satisfy the goal and the studied barrier shows the improved confidence.

Anodic Stripping Polarograph에 의한 극미량 게르마늄의 분석(II) (Determination of Trace Germanium by Anodic Stripping Polarography)

  • 최원형;이종무
    • 분석과학
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    • 제5권1호
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    • pp.17-24
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    • 1992
  • Catechol의 유도체인 3, 4-dihydroxybenzoic acid, 3, 4-dihydroxybenzaldehyde, 그리고 adrenaline을 사용하여 게르마늄과 착물을 형성시킨 후 Anodic Stripping Polarography로 정량한 후, 천연물 중의 게르마늄 정량에 적용시켜 분석한 결과 인삼에서 $300{\mu}g/L$, 광천수에서 $210{\mu}g/L$를 검출할 수 있었다.

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Precipitated Calcium Carbonate Synthesis by Simultaneous Injection to Produce Nano Whisker Aragonite

  • Ramakrishna, Chilakala;Thenepalli, Thriveni;Huh, Jae-Hoon;Ahn, Ji Whan
    • 한국세라믹학회지
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    • 제53권2호
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    • pp.222-226
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    • 2016
  • The synthesis of pure calcium carbonate nanocrystals was achieved using a simultaneous injection method to produce nano particles of uniform size. These were characterized using scanning electron microscopy and powder X-ray diffraction. The nano particles were needle-shaped aragonite polymorphs, approximately 100-200 nm in length. The aragonite polymorph of calcium carbonate was prepared using aqueous solutions of $CaCl_2$ and $Na_2CO_3$, which were injected simultaneously into double distilled water at $50^{\circ}C$ and then allowed to react for 1.5 h. The resulting whisker-type nano aragonite with high aspect ratio (30) is biocompatible and potentially suitable for applications in light weight plastics, as well as in the medical, pharmaceutical, cosmetic and paint industries.

인쇄잉크용 로진변성 페놀수지의 분자량 분포에 관한 연구 (Molecular Weight Distribution of Rosin Modified Phenol Resin Used in Media for Printing Varnishes.)

  • 김성빈
    • 한국인쇄학회지
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    • 제7권1호
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    • pp.65-72
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    • 1989
  • Modified phenolics can have a retarding effect on the gelation of wood oil. Modified phenolic resins can be used in media for paint, varnishes, primers, overprinting varnishes, litho, letterpress and rotogravure inks. Varnishes based on rosin phenolic are faster drying, have better durability, are harder and glosser, and have greater resistance to water than ones based on ester gums. These physical properties is concerned with molecular weight distribution of rosin modified phenol resin. This paper was studied about molecular weight distribution of rosin phenolics which were prepared between $130~250^{\circ}C$. The results were as follows: 1) Average molecular weights inereased with increasing reaction temperature. 2) $M_w/M_n$ were from 3.43 to 46.44 with increasing reaction temperature and so the molecular weight distributions were changed from random distribution to broad distribution. 3) The relation ship between intrinsic viscosity and weight average molecular weight was follows: $[{\;}{\;}]={\;}1{\times}{\;}10^{-6}M_w,{\;}M_w=M_w$ 4) Esterification reaction between the acid group of rosin and polyol was started about $230^{\circ}C$$.

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Poly(VAc-co-EA) 공중합체 제조에 있어 보호콜로이드의 영향에 관한 연구 (Effect of protective colloid on the synthesis of Poly(Vinyl acetate-co-Ethyl acrylate))

  • 김남석;김성훈
    • 한국응용과학기술학회지
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    • 제27권2호
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    • pp.216-221
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    • 2010
  • Polyvinyl acetate (PVAc) prepared by emulsion polymerization has broad applications for additive such as paint binder, adhesive for wood and paper due to its low glass transition temperature which help to plasticize substrate resins. Since emulsion polymerization has a disadvantage that surfactant and ionic initiator degrade properties of the product polymer, poly (vinyl acetate-eo-ethyl acrylate) (VAc-EA) was synthesized using potassium persulfate as catalyst and polyvinylalcohol (PVA) as protective colloid to prevent the degradation. The copolymer latex product was internally plasticized and has enhanced adhesion, water resistance during VAc-EA emulsion polymerization. No coagulation and complete conversion occur with the reactant mixture of 10 mmol/L potassium persulfate, 10 mmol/L poly ( vinyl alcohol) (PVA 17). As the concentrations of PVA increase, the viscosity becomes increase.

투습방수용 수분산 폴리우레탄의 합성 및 특성에 관한 연구 - PEG와 DMPA 함량의 영향 - (A Study on the Synthesis and Characterization of Waterborne Polyurethanes for Water Vapor Permeable / Waterproof - Effect of PEG and DMPA Content)

  • Kwak, Yong-Sil;Kim, Eun-Young;Kim, Han-Do
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 2003년도 가을 학술발표회 논문집
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    • pp.42-45
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    • 2003
  • Polyurethane(PU) products are generally used in the automobile, paint, furniture, adhesive, the medical and textile industries. Recently, the increasing acceptance of waterborne polyurethane (WBPU) Is motivated by more stringent environmental requirements, such as the reduction of solvent emissions into the atmosphere [1]. The application for textiles includes suede processing, soft-hand processing, wrinkle-free processing, antistatic processing, sizing and adhesives. (omitted)

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마감재가 시공된 콘크리트에 있어서 염화물 확산계수 산정 방법 (A Calculating Method of Chloride Ion Migration Coefficient in Concrete Coated Finish Materials)

  • 조한규;안재철;강병희;오상균
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2011년도 춘계 학술논문 발표대회 1부
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    • pp.31-32
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    • 2011
  • The purpose of this study is to investigate the amount of chloride penetration into concrete finishing materials. Chloride ion migration test was used rapid infiltration method proposed by 'NT-Build 492'. The kind of coated finishing material is 'None-finished(N)', 'Cement Mortal(M)', 'Water based paint(P)', 'Bone-Tile(B)', 'Repair Mortal(R1)' in this paper.

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거북선 형상의 해상소각선 실용화 가능성에 관한 연구 (A feasibility study on the application of turtle boat form to the incinerating vessel)

  • 이귀주;최영빈
    • 한국해양공학회지
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    • 제11권3호
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    • pp.95-99
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    • 1997
  • In these days, the pollution of marine environment near island at Korean coastal zone caused by the trash human waste and livestocks excreata become intensified. One of the most economic and efficient way to prevent this pollution problem is to set up island circulating incineration system. In this paper, the result of feasibility study on the application of turtle boat hull form to the incinerating vessel has been summarized especially for the resistance and course keeping point of view.

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코팅된 시편과 레이저 빔과의 상호 작용 연구 (Interaction of Beam and Coated Metals at High Power Continuous Irradiation)

  • 김용현;백원계;신완순;여재익
    • 한국군사과학기술학회지
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    • 제14권6호
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    • pp.974-978
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    • 2011
  • The beam-matter interaction with various coating effects has received continued attention in the high power laser community. Previous works suggest that coatings promote target damage when compared to beaming on uncoated surface. Three types of paint coatings(Acrylic urethane, Silicone alkyd and Stealth blend) and a water coat on metals(Al, Ti and STS) are irradiated with a $CO_2$ laser. Both strain and temperature measurements are provided for assessing the instantaneous response characteristics of each coating on different metals. A selective combination of surface coats with metals has proven effective in either preventing or enhancing damage, both thermal and mechanical, associated with focused beaming on a target.

Development of New Edible Pigments using Monascus spp.

  • Cho, Gyu-Seong;Kim, Kwangwook;Park, Won-Jong
    • 한국식품영양학회지
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    • 제32권1호
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    • pp.41-49
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    • 2019
  • Carotene, xanthophyll, carotenoid anthocyan, phycopyrine, chlorophyll, and monascus pigments are used as natural coloring agents since they are more stable to human body than synthetic coloring agents. Among them, monascus pigments are a natural red pigment produced by the Monascus purpureus. For the development of edible paint using natural pigment, Monascus purpureus strain was cultured at a temperature of $35^{\circ}C$ for 15 days on a PDYA plate and liquid medium to produce a red pigment. In addition, a large amount of the red pigment was extracted from Hongkuk Koji in parallel with water extraction and ultrasonic wave extraction. At this time, the yield of ultrasonic extract was 2~4 times higher. Thus, Monascus purpureus strains, etc. were prepared by freeze-drying powder. In conclusion, natural paints made with red pigments have enabled the development of been edible paints that can be used as eco-friendly materials with good viscosity, enhanced spread ability and coloration.