• 한국재료학회지
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• 제16권10호
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• pp.599-605
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• 2006

N-(3-triethoxysilylpropyl)-1,4-diaminoanthrquinone-2,3-dicarboximide (TESP-DADI), an organic blue pigment, has been prepared and incorporated into silica solid matrix reacting triethyl orthosilicate (TEOS) via sol-gel method. Morphology and microstructure of resulting hybrid pigment were studied employing SEM and TEM. The micrographs and particle size distributions showed that uniform pigment can be obtained employing TEOS-based sol-gel method forming silica core. Particle size distribution of dispersed pigment in water was examined using the technique of dynamic light scattering. The ensuing pigment dispersion ink was subjected to various physicochemical evaluation such as viscosity, surface tension, inkjet stability, storage stability, and color change as inkjet ink using spectrophotometric, and microscopic techniques.

• 공업화학
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• 제8권2호
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• pp.252-261
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• 1997

여러 종류의 용제와 수지용액에 있어서의 $CaCO_3$ 안료의 분산 안정성을 Dynometer를 이용하여 조사하였다. Dynometer를 이용하여 비교적 단시간에 분산계의 분산 안정성을 평가할 수 있었으며, Dynometer를 이용한 분산 안정성 평가로부터 구한 $CaCO_3$ 안료의 용해성 파라미터, ${\delta}$는 11.62(${\delta}_d=8.04$, ${\delta}_p=5.05$, ${\delta}_h=6.70$)이었다. 안료와 친화력이 약한 용제가 첨가되는 경우 수지 용액내에서의 안료표면에의 수지 흡착층을 증가시켜 수지 용액내에서의 분산 안정성을 증가시켰다. 수지 용액 제조시 소량 첨가된 용제도 안료를 포함한 전체 분산계의 유동성과 분산 안정성에 큰 영향을 미친다는 것을 알 수 있었다.

• 폴리머
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• 제36권1호
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• pp.104-110
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• 2012

LCD 컬러필터에서 안료의 분산은 컬러 강도를 증가시키는 중요한 요소이므로, 안료를 분산시키기 위한 안료 분산제의 첨가는 필수적이라 할 수 있다. 안료 분산제로서의 고분자는 안료와의 친화성을 가지는 anchoring group과 매체와의 혼화성을 가지는 stabilizing group을 포함하고 있다. 원자 이동 라디칼 중합은 잘 규정된 고분자 합성을 가능하게 하는 중합법으로, 이러한 구조를 포함하는 고분자형 안료 분산제를 얻기 위한 적절한 수단이 될 수 있다. Anchor로서 (2-dimethylamino)ethyl methacrylate를, stabilizer로서 oligo(ethylene oxide)methyl ether methacrylate를 각각 선택해 고분자 분산제를 합성하였다. 고분자의 구조 및 조성이 안료 분산에 미치는 영향을 연구하기 위해 다양한 길이의 stabilizing group을 가지는 diblock copolymer를 합성하여 비교하였다.

• 한국수산과학회지
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• 제9권2호
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• pp.111-119
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• 1976

Discoloration of canned boiled oyster namely greening, yellowing and browning often occur separately or associatively in the storage of the product. Greening is mainly caused by the appearance of chlorophyll and its derivatives on the surface around the digestive diverticula of the oyster and yellowing by dispersion of carotenoid. Browning reactions by sugar amino condensation or enzymatic action, tyrosinase, also cause an undesirable color development. In this paper, the stability and the changes in distributional or partitional ratio of chlorophyll and carotenoid pigment of meat vs viscera in raw and canned oyster during six month storage in order to measure the dispersion rate of both pigments between meat and viscera, and to evaluate the feasibility of discoloration of oyster meat. The development of brownish pigment and the toss of free tyrosine in oyster were also determined to compare the readiness of color development. In addition the influence of processing and storage conditions to the dispersion rate and the tendency of discoloration, and finally the effect of inhibitor were discussed. The results showed that greening or yellowing was initiated by the dispersion of chlorophyll or carotenoids from viscera to the meat of oyster, and the dispersion rate of carotenoid was much higher than the chlorophyll's, so that, yellowing appeared a leading reaction of discoloration. The dispersion rate was obviously fastened by raising the temperature in the process of sterilization and storage. Consequently, the low temperature storage could largely retard the occurance of yellowing or greening of oyster meat. The pH control of canned oyster did not seem to affect the dispersion of pigment but significantly did on the stability of the piqments. Browning by the reaction of sugar-amino condensation and enzymatic oxidation of tyrosine was positively detected in canned oyster meat. The development of brownish color was influenced rather by the storage temperature than the heating process. Addition of sodium sulfite in can or treating the boiled oyster with sulfite solution prior to filling seemed possibly inhibit the color development particularly in cold-storaged oyster meat.

• 한국재료학회지
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• 제16권7호
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• pp.422-429
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• 2006

Studies were performed on preparation of organic-inorganic hybrid silica dye in a dispersing ink system. The silica was subjected to surface modification using 3-aminopropyltrimethoxysilane (APTMS) in order to promote the chemical reactivity of the raw silica. On the surfaces of the aminosilane-functionalised silica, red vinylsulfone-containing azo dye was adsorbed. The dye was found to have chemically reacted with the aminosilane-grafted silica surface, which was proven by FT-IR spectra. Studies on morphology and microstructure were performed employing scanning electron microscopy. The SEM micrographs and particle size distributions showed that a homogeneous pigment can be obtained employing silica as a core. Particle size distribution was also examined using the technique of dynamic light scattering. The ensuing pigment was subjected to various physicochemical evaluation such as inkjet property, storage stability, color change as inkjet ink using printer, spectrophotometric, microscopic techniques. Studies on hybrid dyes from the silica surface demonstrated that, in general, stable pigments for inkjet dispersion ink were obtained.

• 한국고분자학회지:고분자과학과기술
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• 제9권6호
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• pp.492-499
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• 1998

• 한국세라믹학회지
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• 제52권6호
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• pp.497-501
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• 2015

Inkjet printing is a widespread technology, offering advantages such as high-quality decoration, a continuous process, and the accurate direct reproduction of patterns or pictures. In inkjet printing technology, the dispersion stability of ceramic ink is one of the most important factors. In this study, the dispersion stability of blue $CoAl_2O_4$ ink for ceramic inkjet printing is systematically investigated. Blue $CoAl_2O_4$ pigment was synthesized by a solid-state reaction and then milled to less than 300nm in size. In order to investigate the influence of the viscosity on the dispersion stability, two types of $CoAl_2O_4$ ceramic inks (termed here Blue L and Blue H) were prepared using different volume ratios of ethylene glycol and ethanol. The Blue L and Blue H ink solutions contained cetyltrimethylammonium bromide(CTAB) as a dispersive agent. The viscosity, surface tension and jetting stability of the $CoAl_2O_4$ ceramic inks were analyzed using a rheometer, a surface tension meter and a dropwatcher. The dispersion stability of the $CoAl_2O_4$ ceramic ink was investigated by a multiple light-scattering method. Blue H, a ceramic ink with higher viscosity, showed much better dispersion stability than the Blue L ceramic ink.

• 한국염색가공학회지
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• 제29권4호
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• pp.202-210
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• 2017

In recent years, the water-based ink have been widely used in various industrial applications due to environmental problems. Dispersibility of the pigment for applications of the water-based ink is the one of the most important technical factors to produce uniform color products. Thus, in this study, the three-roll mill process was used to improve the dispersion of the water-based ink. The results indicated that the three-roll mill reduced the size of pigment particles in the ink more than 50%. In addition, the dispersant showed an important role to maintain the dispersion stability of the pigment in the water-based ink over 120 hours. We also confirmed the optimum contents of the ink stock solution, drying temperature and drying time by the colorimeter and colorfastness tests on produced PET synthetic suedes.

• 공업화학
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• 제19권3호
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• pp.264-269
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• 2008

크롬산납안료입자의 합성과정에서 반응조건의 변화에 따른 입자의 성장특성, 첨가제 첨가에 의한 영향, 그리고 마이크로캡슐화에 관하여 조사하였다. 크롬산납 무기안료의 합성과정에서 생성용액의 pH가 낮을수록, 반응물질의 초기농도가 묽을수록 입자크기가 작은 균일한 분산입자를 얻을 수 있었다. 교반속도가 큰 경우에서 평균입자크기의 감소 및 증가에 대한 변화폭이 크게 나타남을 알 수 있었다. 합성된 크롬산납 안료입자의 숙성과정에 황산알루미늄을 첨가하여 표면처리 함으로써 입자크기의 제어가 가능하였고, 입자의 입도분포 상태를 최적 분산 상태로 유지하는 효과가 있음을 알 수 있었다. 안료입자의 마이크로캡슐화가 진행되는 용액의 pH 범위를 9~10, 반응온도를 $90^{\circ}C$ 이상으로 유지하고 마이크로캡슐화 후 충분한 건조를 통해 입자의 수분함량을 0.5% 이하로 유지할 때 최적의 마이크로캡슐화가 됨을 알 수 있었다.

• Journal of Ceramic Processing Research
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• 제20권6호
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• pp.589-596
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• 2019

Pigments with minute particle sizes, such as carbon black (CB) and pigment red 48:2 (P.R.48:2), are the most important types of pigment and have been widely used in many industrial applications. However, minute particles have large surface areas, high oil absorption and low surface energy. They therefore tend to be repellent to the vehicle and lose stability, resulting in significant increases in viscosity or reaggregation in the vehicle. Therefore, finding the best way to improve the dispersion properties of minute particle size pigments presents a major technical challenge. In this study, minute particle types of CB and P.R.48:2 were treated with nitrogen gas plasma generated via radio frequency-plasma enhanced chemical vapor deposition (RF-PECVD) to increase the dispersion properties of minute particles in deionized (DI) water. The morphologies and particle sizes of untreated and plasma treated particles were evaluated using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The average distributions of particle size were measured using a laser particle sizer. Fourier transform infrared spectroscopy was carried out on the samples to identify changes in molecular interactions during plasma processing. The results of our analysis indicate that N2 plasma treatment is an effective method for improving the dispersibility of minute particles of pigment in DI water.