• 한국재료학회지
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• 제29권10호
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• pp.639-646
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• 2019

Ink-jet printing is a manufacturing process technology that directly prints a digitalized design pattern onto a substrate using a fine ink jetting system. In this study, environmentally friendly yellow aqueous ceramic ink is synthesized by mixture of distilled water, yellow ceramic pigment and additives for ink-jet printing. The graft polymer, which combines electrostatic repulsion and steric hindrance mechanism, is used as a surfactant for dispersion stability of aqueous ceramic ink. Synthesized ceramic ink with graft polymer surfactant shows better dispersion stability than did ceramic ink with PAA surfactant; synthesized ink also shows desirable ink-jet printability with the formation of a single ink droplet during printability test. Finally, ceramic ink printed on glass substrate and ceramic ink with graft polymer surfactant shows a high contact angle without surface treatment on glass substrate. Consequently, it is confirmed that the ceramic ink with graft polymer surfactant can achieve high printing resolution without additional surface treatment process.

• 한국재료학회지
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• 제27권11호
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• pp.583-589
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• 2017

Ceramic ink-jet printing has become a widespread technology in ceramic tile and ceramicware industries, due to its capability of manufacturing products on demand with various designs. Generally, thermally stable ceramic inks of digital primary colors(cyan, magenta, yellow, black) are required for ink-jet printing of full color image on ceramic tile. Here, we synthesized an aqueous glass-ceramic ink, which is free of Volatile organic compound(VOC) evolution, and investigated its inkjet printability. $CoAl_2O_4$ inorganic pigment and glass frit were dispersed in aqueous solution, and rheological behavior was optimized. The formulated glass-ceramic ink was suitably jetted as single sphere-shaped droplets without satellite drops. After ink-jet printing and firing processes, the printed glass-ceramic ink pattern on glazed ceramic tile was stably maintained without ink spreading phenomena and showed an improved scratch resistance.

• 한국세라믹학회지
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• 제54권6호
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• pp.478-483
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• 2017

The advantage of ceramic ink-jet printing technology is the accurate and fast printing process of digital images for various products. For digital ink-jet printing applications, ceramic ink requires proper viscosity and surface tension, along with dispersion stability of the inorganic pigments. The purpose of this study is the formulation of an environment-friendly ceramic ink with a water-based system; using nano-sized $CoAl_2O_4$ pigment as a raw material, ink should have dispersion stability to prevent nozzle clogging during ink-jet printing process. In addition, the surface tension of the ceramic ink was optimized with the polysiloxane surfactant according to the surface tension requirement (20 - 45 mN/m) for ceramic ink-jet printing; by adjusting the viscosity with poly ethylene oxide, jetting behavior of the ceramic ink was investigated according to changes in the physical features through drop watcher measurement.

• 한국결정성장학회지
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• 제28권3호
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• pp.123-129
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• 2018

고온 열처리 후에도 안정적인 발색 효과를 가지는 디지털 4원색(cyan, magenta, yellow, black; CMYK)의 세라믹 잉크를 활용한 세라믹 잉크젯 프린팅 기술은 다양한 제품의 디지털 이미지를 정확하고 빠르게 인쇄 가능하다는 장점을 가지고 건축 및 세라믹 산업 분야에서 기존 공정을 빠르게 대체하고 있다. 세라믹 잉크젯 프린팅 기술은 무기 안료의 분산 안정성과 함께 적절한 점도와 표면 장력을 필요로 하며 기존에는 이러한 요구조건에 부합하는 유기용매 기반의 잉크가 주로 사용되어져 왔으나 최근에는 VOCs가 발생하지 않는 환경친화적인 세라믹 잉크 소재에 대한 관심이 커지고 있다. 본 연구에서는 $CoAl_2O_4$ cyan 발색 무기안료와 alumino boro-silicate 유리 분말을 사용하여 친환경적인 수계 세라믹 복합잉크를 합성하고, 수계 시스템에서의 유변학적 물성과 분산성을 최적화하여 잉크젯 프린팅 공정에서의 토출성 및 프린팅 특성에 대해 연구하였다. 그 결과, 합성된 수계 세라믹 복합잉크는 점도 및 표면장력 조절을 통해 satellite drop이 발생하지 않는 토출 거동을 보였으며, 유리 기판 위에서도 높은 접촉각으로 인해 잉크 퍼짐 현상이 최소화되며 프린팅되는 것을 확인하였다.

• 한국결정성장학회지
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• 제25권1호
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• pp.20-26
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• 2015

세라믹 잉크젯 기술은 아트타일, 장식용 도자기 등에 이용되고 있으며, 원료의 효율이 높고 낮은 제작비용으로 다양한 이미지를 빠르고 정확하게 인쇄할 수 있다는 장점을 가지고 있다. 잉크젯 프린팅 타일에 나노세라믹안료를 적용하기 위해서는 안정적인 잉크분산성 확보가 필수적이다. 본 논문에서는 잉크젯 인쇄용 수계 pink-red 세라믹잉크의 특성을 보여주고 있다. $CaCr_{0.1}Sn_{0.8}SiO_5$ 안료는 고상법을 이용하여 합성하였고, 잉크 토출 시 잉크젯 헤드의 노즐 막힘을 방지하기 위해 어트리션밀을 이용하여 분쇄한 안료를 사용 하였다. 수계 세라믹잉크 제조 시 $CaCr_{0.1}Sn_{0.8}SiO_5$ 나노안료의 농도는 10 wt%로 고정하였고, sodium dodecyl sulfate(SDS)를 0.4 wt% 첨가 하였을 때 최적의 분산성을 가지는 것을 확인할 수 있었다. 또한 수계 세라믹 잉크의 원활한 토출을 위해 polyvinyl alcohol(PVA)을 0.18 wt% 첨가하여 점도 조절을 하였다. 제조된 pinkred 세라믹 잉크는 토출 시 $180{\mu}s$ 이후 구형의 단일액적을 형성 하는 것을 확인할 수 있었다.

• 한국세라믹학회지
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• 제46권1호
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• pp.41-46
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• 2009

The rheological properties of highly concentrated Ag nano sol depending on particle size were studied. The Ag nano sol was prepared by reducing the Ag ion in aqueous solution. The size of Ag nano particle was controlled by two steps of nucleation and growth, and the thickness of adsorption layer was varied by molecular weight of polyelectrolytes. The polyelectrolytes acted as not only ionic complex agent in ionic state and but also dispersant after formation of Ag nano sol. The effective volume was controlled by combination of varying the molecular weight of polyelectrolytes and the size Ag nano sol. The particle size and the viscosity of nano sol were characterized by particle size analyzer, HR-TEM and cone & plate viscometer. It was found that the 10 nm and 40 nm-sized Ag nano sols were prepared by controlling the nucleation and growth steps, respectively. Finally, we could prepare highly concentrated Ag nano sol over 50 wt%.