Preparation of β-Type and γ-Type C.I.Pigment Red 170
In this paper,the solvent recrystallization process of C.I.Pigment Red 170 was studied.And the effect of heat treatment time on the pigment properties when pigmentation was carried out in methanol and ethanol solvents was investigated.The results showed that the crystalline form of C.I.Pigment Red 170 was transformed from α-type to β-type during the pigmentation in methanol and ethanol,respectively.After hydrothermal treatment and pigmentation in methanol,the crystalline form of C.I.Pigment Red 170 changed from α-type to γ-type.After solvent pigmentation,the C.I.Pigment Red 170 showed a small particle size(0.752 μm),an enhanced hydrophilicity and increased vividness and fluidity.And the tinting intensity could reach up to 195.31%.
C.I.Pigment Red 170crystal typepigmentationsolvent
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