PRODUCTION OF BLUE CO-ALUMINATE PIGMENTS FOR INK JET INKS

Abstract

In ceramic industry, ink-jet decoration has been became a widespread technique in recent years because of providing high quality decoration and allowing to use standard color inks. The inks used in inkjet printing are prepared by using submicron-sized pigments (<500 nm). In this study, synthesis of blue Co-aluminate (CoAl2O4) pigment by ceramic method with Co3O4ve Al2O3 raw materials, grinding of stable suspensions that were prepared with addition of 0.3 wt.% Darvan C and 1 wt.% STPP as dispersant in attrition and planetary ball mill and color properties were investigated. In the suspension containing Darvan C in planetary ball mill, higher grinding efficiency were obtained comparing to attrition milling. Blue Co-aluminate pigment was ground successfully to 230 nm after 240 min in planetary ball mill. Although, contamination of ZrO2 comes from balls and grinder, surface charge and isoelectric point of pigments were not affected. It was determined that colour shade changes from blue to turquoise blue with degreasing of particle size of pigments. However, this alteration did not affect the colour shade of pigments after firing. As a result, it was revealed that there is no negative effect of grinding proses on chemical and thermal colour stability on Co-aluminate pigments and Co-aluminate pigments have a using potential in ceramic ink-jet inks by grinding to submicron size. 

Keywords

• Co-Aluminate pigments
• Inkjet decoration
• Grinding
• Colour properties

İNKJET MÜREKKEPLERİ İÇİN MAVİ CO-ALÜMİNAT PİGMENTLERİNİN ÜRETİLMESİ

Abstract

Seramik endüstrisinde inkjet baskılama tekniği, yüksek kalitede dekorlama ve standart renkte mürekkeplerin kullanımına olanak sağlaması açısından gün geçtikçe yaygınlaşan bir dekorlama tekniğidir. Bu teknikte kullanılan mürekkepler mikron altı ( < 500 nm) pigmentler ile hazırlanmaktadır. Bu çalışmada inkjet mürekkep renklerinden biri olan mavi Co-aluminat pigmentinin Co3O4 ve Al2O3 hammaddeleri kullanılarak geleneksel yöntemle sentezlenmesi, tozlardan ağırlıkça % 0,3 oranında Darvan C veya % 1 STPP ilavesiyle kararlı süspansiyonlar hazırlanarak atritör ve eksenel değirmenlerde öğütülebilirliği ve renk özellikleri araştırılmıştır. Darvan C içeren pigment süspansiyonlarının eksenel değirmenle öğütülmesi sonucunda atritör değirmenle öğütülmeye kıyasla daha yüksek öğütme verimi sağlamıştır. Mavi renkli Co-aluminat pigmenti, eksenel değirmenle 240 dak sonunda 230 nm tane boyutuna başarıyla öğütülmüştür. Öğütücü hazne ve bilyelerden ZrO2 kirliliği gelmesine rağmen pigmentlerin yüzey yükü ve izoelektrik noktası etkilenmemiştir. Pigment tozlarının tane boyutu azaldıkça renk tonunda mavi renkten mavi-turkuvaz renge doğru değişim olduğu tespit edilmiştir. Ancak bu değişim, pişirim sonrasında rengin kromasını önemli derecede etkilememiştir. Sonuç olarak öğütme sürecinin, Co-Alüminat pigmentinin kimyasal ve termal renk kararlılığı üzerine olumsuz yönde bir etkisinin bulunmadığı ve Co-aluminat pigmentinin mikron altı boyutlara öğütülerek inkjet mürekkeplerinde kullanılabileceği ortaya çıkartılmıştır.

Keywords

• Co-Alüminat pigmentleri
• İnkjet dekorasyon
• Öğütme
• Renk özellikleri

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