| With the development of ceramic decoration technology,the inkjet printing has become a research hotspot in the field of ceramic.Ceramic inkjet printing inks have a strict requirement on the particle size.Since the red inclusion pigment can't be grinded,the pigment has not yet been applied in ceramic inkjet printing.In this paper,the goal is to prepare red ceramic pigment which can be applied in inkjet printing.Effects of zirconium silicate wrapping cadmium sulphide selenide preparation process condition on particle size,chromaticity were studied.(1)Effects of reaction temperature,reactant solution concentration,calcination atmosphere,temperature,duration and grinding on the structure,performance and particle size of pigment were studied when coprecipitation method was used in the preparation of cadmium sulphide selenide colorant.The main conclusions were as follows:the temperature had a greater effect on the primary grain of cadmium sulphide selenide than the concentration of the reactant solution,while changing the temperature and concentration had a little effect on reducing the particle agglomeration.The agglomeration of cadmium sulphide selenide solid solution calcined in the nitrogen atmosphere was significantly reduced compared with the sample prepared in air.Conventional ball milling treatment did not reduce the particles size and agglomeration.(2)Effects of calcination process and ratio of reactants on the inclusion pigment structure,color performance and particle size were investigated when coprecipitation method was used in preparation of CdSxSe1-x@ZrSiO4 pigment.The main conclusions were as follows:the protective effect on cadmium sulphide selenide was not abvious when the calcination process was carried out no matter in N2 or in graphite crucible,so the inclusion pigment was calcined in air,sacrificing the surface colorant to protect the internal pigment.When the ratio of reactant were Cd:S:Se=4:3:1,Zr:Cd=3:1,the inclusion pigment with red chroma a*value of 29.97 and D50 about 8.25 ?m was prepared by calcining the precursor in air at 1050? for 30min.(3)When CdSxSe1-x@ZrSiO4 pigment was prepared by non-hydrolysis sol-gel method,effects of mineralizer type,calcination temperature on zirconium silicate crystal phase were investigated.Also,effects of calcination temperature and atmosphere on the inclusion pigment structure,crystal phase and performance were studied.The results were as follows:when the mineralizer was NH4VO3,the zirconium silicate was yellowish green or blue-green,which would affect the color of the red pigment.When LiF was used as the mineralizer,the crystal phase prepared by non-hydrolysis sol-gel method could not be prepared stably at high temperature.Although the zirconium silicate precursor had a space grid structure,which was more favorable for wrapping small particlese,due to the corrosion of the cadmium sulphide selenide solid solution by the acid zirconium acetate solution,the chroma of the red inclusion pigment was not ideal.(4)Effects of wrapping process,calcination temperature,atmosphere and material proportion on the structure,performance and particle size of red inclusion pigment were studied when CdSxSe1-x@ZrSiO4 pigment was prepared by hydrolysis coprecipitaion method.The optimum conditions were as follows:at room temperature(25?),the ratio of Zr/Cd was 3:1,the ratio of Si/Zr was 1:1,the zirconia and cadmium sulphide selenide suspension precursor was wrapped by silicate sol prepared by hydrolysis of ethyl orthosilicate with catalysis of ammonia.The CdSxSe1-x@ZrSiO4 pigment with red chroma a*value of 32.04 and particle size D50 about 2 pm could be prepared by calcining the precursor at 1050 0C for 30 min.This preparation process provides an availlable idea for the application of encapsulating materials in inkjet printing. |
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