Abstract
NaOH solutions with different concentration were used to pre-treat YPs (yellow pigments) in order to investigate surface modification effects on stability and particle size of pre-treated yellow pigments (PYPs). The coupling agent KH550 was used to treat PYP10 (yellow pigment pre-treated with 10% NaOH) to be compared for PYPs. The YPs (yellow pigments) were pre-treated by NaOH solutions and rinsed with C2H5OH, then the filtrates and residues were analysed by spectrophotometer and laser granularity analyser; The filtrates are stratified after the PYPs rinsed with C2H5OH. Microscope and Natural settling experiment were used to analyse the particle size and stability in residues. The results show that the particle size of wet PYPs decreased with the concentration of NaOH, and the particle size of PYP30 was smaller than that of PYP10-KH550 (PYP10 treated with 5% KH550). The laser granularity analyser results show that the particle size of dry PYPs increased with the concentration of NaOH. The settle time of PYPs in water indicated that the stability of PYPs increased with the concentration of NaOH and PYP10-KH550 has the poorest stability. These results indicated that PYP30 has smallest particles and best stability, and it has the potential to be used in industry.
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