• 패션비즈니스
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• 제20권5호
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• pp.76-86
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• 2016

In this research, the dyeing properies of Amur cork tree on sheep leathers were evaluated. The proper dyeing conditions were identified with K/S values depending on the colorant concentration, dyeing time, dyeing temperature and dye bath pH. For the proper conditions, the changes of color for different mordants(Al, Cu and Fe) were observed as $L^*a^*b^*$ coordinates and H V/C values. The color fastnesses were also examined, and the antimicrobial properties were examined. The results were as follows: For the sheep leather, the optimized dyeing conditions were 300% o.w.f., 40 min., $40^{\circ}C$, and pH 5. The leather color was yellow in the dyeing and mordanting. Although the $L^*a^*b^*$ changed with the mordants and mordanting methods, the overall hue was yellow. The colorfastness to light was reduced compared to original(untreated) sheep leather. The rubbing fastness was generallry satisfactory as 4-5 rating. The dry-cleaning fastness(stain) of leathers were generally at the 4-5 level, but dry-cleaning fastness(fade) was a little reduced compared to original sheep leather. The dyed and pre-mordanted and dyed sheep leather showed excellent antimicrobial properties.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2009년도 춘계학술발표논문집
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• pp.372-375
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• 2009

반도체 봉지재란 실리콘 칩, 골드와이어, 리드프레임 등의 반도체 소지를 열, 수분, 충격으로부터 보호하기 위해 밀봉하는 재료로서 EMC(Epoxy Moding Compound)가 가장 많이 쓰인다. EMC는 기계적, 전기적 성능향상을 위한 무기재료로 실리카(Silica), 열에 의해 경화되어 3차원 경화구조를 형성하는 에폭시수지, 빠른 경화특성을 부여하기 위한 경화제로서의 페놀수지, 유기재료와 무기재료 사이의 결합력을 높이기 위해 커플링제, 카본블랙, 이형성 확보를 위한 왁스(Wax), 착색제(Colorant), 난연제(Flame Retardant)등의 첨가제로 구성되는 복합소재로써 본 연구에서는 에폭시의 유형에 따른 용융 실리카를 주충진재로 하여 각각의 봉지재의 첨가제를 기준으로 할 때 다양한 형태의 친환경 비할로겐계 반응형 난연제를 합성하는 기술을 개발하고 비 할로겐계 및 Sb 계 첨가형 난연제의 혼용 배합을 통해 친환경 EMC용 난연제의 제조기술을 개발하였다. 이들 EMC의 요구특성은 요구특성은 외부환경으로부터 칩 보호, 칩을 전기적으로 절연특성 유지, 칩의 작동시 발생되는 열의 효과적인 방출 특성 유지, 실장(Board Mounting)의 간편성 특성을 확보해야 하는 특성을 지니고 있어 이들 요구특성에 적합한 특성조사가 함께 이루어졌다.

• 대한화장품학회지
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• 제24권3호
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• pp.73-80
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• 1998

This Study was performed to get the suitable oil dispersion agent by assessment of color strength of organic pigment in non-aqueous systems. Organic pigment is used as a color expression material with other body pigments in the make-up products. But occasionally aggregation or agglomeration occurs for the lack of affinity with medium, This function is the cause of disturbing homogeneous dispersion, and then bring about an instability of products. Our study, research of dispersion mechanism between the pigment and oil phase, has been executed to solve this problem, and find a oil dispersion agent having optimum dispersion condition. Generally dispersion is related to between the solid-liquid mutual properties and electrical phenomena associated with solid-liquid interface. This factor is determined to input energy, milling time, optical properties, particle size, rheological properties, etc. Ideal dispersion state is told that coloring primary solid particle is homogeneously dispersed in medium. Good dispersed colorants are strongly and clearly appeared. We are already known that the particle size of organic pigment, chemical properties and viscosity of medium, refractive index. Consequently We determine the affinity of medium and organic pigment by measuring of color strength in the same mechanical condition. UV-VISIBLE RECORDING SPECTRO PHOTOMETER is used for measuring apparatus. We can decided the dispersion level of oil dispersion agent by measuring absorbance of color strength in the visible range that diluted medium for colloid colorant particles.

• 한국세라믹학회지
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• 제36권4호
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• pp.333-342
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• 1999

This research was performed to investigate how the basic glaze change affected colour development at high temperature with a stable colorant (spinel structure CoAl2O4 pigment) The compounded pigment which is widely used for porcelain was also tested for the basic glazes adaptability. The data from the test were recorded in a computer data-base program. Therefore could be easily used in the study related with a pottery field. CoO : Al2O3 system spinel pigment of barium glaze lime glaze zinc glaze lead glaze and talc glaze were chosen for this study. The colors of Cobalt blue bright blue, blue purple were seen at the wave lengths of 455-480nm at the firing temperature of 1250$^{\circ}C$. Stable color were obtained from lime glaze bar-ium glaze zinc glaze. All the information in the database were used to examine all the possible result of the test in the study of porcelain. When the test results database were examined in all temperature ranges the lack of adhesion with the pigment occurred at the temperature of 1150$^{\circ}C$. The lack of adhesion is seen due to vaporization of the lead glaze.

• 동아시아식생활학회지
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• 제14권4호
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• pp.355-362
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• 2004

Studies on extraction and color stability of carotenoids from astringent persimmon(Diospyros kaki) were performed to provide the basic information for the utilization of persimmon pigment as a new source of natural food colorant. The major carotenoids in astringent persimmon were beta-cryptoxanthin, lycopene and beta-carotene. Beta-cryptoxanthin was the first major pigment and lycopene the next. Total carotenoid content in persimmon calculated as beta-carotene equivalent was 107.4 $\mu\textrm{g}$/g. The data indicated that the astringent persimmon was a good source of carotenoid pigment. The physical and chemical stabilities of carotenoid from astringent persimmon were investigated at various conditions of temperature, pH and antioxidant. The effects of oxygen and light on the stability of carotenoid pigment has been investigated. The factors that cause the discoloration were visible light, temperature above 60, pH below 5 and oxygen. Especially, the carotenoid pigment was very sensitive to light and oxygen. Carotenoid stability was much improved with increasing nitrogen concentration in the atmosphere. Persimmon pigments have been found to be most stable at 5∼10. And tocopherol was the most effective inhibitor of the pigment discoloration.

• International Journal of Industrial Entomology and Biomaterials
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• 제29권2호
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• pp.179-184
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• 2014

Silkworm (Bombyx mori ) feces have long been used in the pharmaceutical and food industries as a natural colorant. However, there is limited data on the bioactive compounds that constitute silkworm feces. This research emphasizes the antioxidant activity of different solvent and flavonoid extracts of silkworm feces. The solvents were ethanol, butanol, and water, while the methods utilized included ultrasonification, stirrer, reflux, and reflux after ultrasonification extraction. Results showed that butanol ultrasonification extraction (BUE) yield the lowest extraction (1.75%), while the other methods yielded 7 to 14%. The total polyphenol content utilizing BUE was 3.3 mg TAE/g, while water ultrasonification extraction (WUE) yielded the highest extraction rate with 51.6 mg TAE/g. The total flavonoid content was significantly higher using ethanol reflux extraction (EUE) at 266.8 mg QRE/g BUE, which was 158.3 and 151.3 mg QRE/g. Both DPPH radical scavenging activity and SOD-like (superoxide dismutase) activity, showed significant antioxidant effects. Finally, all other extracts except for BUE had a-glucosidase inhibition at 60%. Therefore, an effective extraction method for physiologically active substances must be selected.

• 패션비즈니스
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• 제16권2호
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• pp.138-150
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• 2012

Nano Inkjet DTP technology, a new technology introduced recently, can be applied to various types of fabric, and pre-treatment process can be omitted, which makes the whole printing process compact. Some important factors for DTP are color difference between the color selected by the designer on PC and the color on the final product and durability of the final fabrics. In this study, the twenty-three trend colors of 2012-2013 F/W suggested by PeclersParis have been picked to be printed on cotton, silk and polyester fabrics, then K/S and ${\Delta}E$ value and color fastness were measured. The results show that dyeability of fabric is varied for each color group, and that also tone of color affect to dyeability when measured for colors in the same group. In general, for all fabric, light fastness, washing fastness and color fastness to sublimation are outstanding. However, because of poor rubbing fastness, additional treatment to fix colorant on fabric is required.

• Journal of Information Display
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• 제12권1호
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• pp.5-10
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• 2011

A novel architecture and proprietary electronic inks were developed to provide disruptive digital-media solutions based on an electrokinetic technology platform. The flexible reflective electronic media (eMedia) was fabricated by imprinting three-dimensional microscale structures with a roll-to-roll manufacturing platform. The HP technologies enable the required attributes for eMedia, such as low power, transparency, print-quality color, continuous levels of gray, and lowcost scalability. Pixelation was also demonstrated by integrating with the prototype oxide thin-film transistor backplane, and the system architecture was further developed by stacking primary-colorant layers for color reflective-display application. The innovations described in this paper are currently being developed further for the eSkins, eSignage, and ePaper applications.

• 한국의류학회지
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• 제29권11호
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• pp.1520-1526
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• 2005

Henna is a natural colorant and has been used to dye hair, skin and leather since civilization began. It has reddish brown to orange shade. The major color components of Henna are Lawsone(2-hydroxy-1,4-naphthaquinone) and Luteolin (3',4',5,7-tetrahydroxy-flavone). In this study, various fibers containing the nitrogen component, especially used fur underwear, were dyed with Henna under various dyeing conditions, then dyeing characteristics, color fastness, and anti-bacterial properties were evaluated. from the results, Henna has good affinity to the chlorinated wool>wool>Pu/nylon>nylon>soybean>silk in decreasing order. The color fastness of the wool fabric dyed with Henna to washing, dry-cleaning, and perspiration showed 4-5 grade. The color fastness to light was 3rd grade. These results are relatively good comparing with other natural dyes. Moreover dyed fabric with Henna showed excellent antibacterial activity.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2011년도 제45차 학술발표회
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• pp.41-41
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• 2011

The aims of this study were to examine the efficacy of phytochemicals of Rumex crispus as anti-oxidant and anti-browning agent. The bioactive properties of Rumex crispus as natural colorants were studied by total phenolic contents, DPPH radical scavenging, ABTS radical scavenging,lipid peroxidation, cell viability, singlet oxygen quenching and photoprotection effect. Among all of the results ($IC_{50}$: the concentration of various extracts required to exert 50% reducing effect), the higher activity of the extract was found in the ethyl acetate and butanol extracts. Anti-browning activity was evaluated by monitoring the change $L^*$, $a^*$, $b^*$ values and total color differences(${\Delta}E$). It was found that ethyl acetate and butanol extracts effectively inhibited browning in apple juice at a concentration below 0.3 mg/ml. Rumex crispus extracts used natural colorants could be of good resources as anti-oxidant and anti-browning agents. The results suggest that our study may contribute to the development of natural and functional materials with potential application to reduce oxidative damage.