Process for producing haematite pigments

Process for producing a haematite pigment having an a* value greater than 20, especially greater than 25, CIELAB units measured as a full shade in alkyd resin to DIN EN ISO 787-25:2007, by reacting iron sulfate with oxygen in the presence of a pigment seed, characterized in thata) water comprisingi)...

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Main Authors SCHAUFLER, LARISSA, KATHREIN, CHRISTINE, ROSENHAHN, CARSTEN, WEBER-CZAPLIK, ANNA
Format Patent
LanguageChinese
English
Published 21.04.2024
Subjects
CHEMISTRY
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
INORGANIC CHEMISTRY
MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES
METALLURGY
NANOTECHNOLOGY
PERFORMING OPERATIONS
SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES
TRANSPORTING
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Summary:Process for producing a haematite pigment having an a* value greater than 20, especially greater than 25, CIELAB units measured as a full shade in alkyd resin to DIN EN ISO 787-25:2007, by reacting iron sulfate with oxygen in the presence of a pigment seed, characterized in thata) water comprisingi) at least one pigment seed selected from the group consisting of FeOOH and Fe2O3 andii) iron sulfateforms an initial charge andb) at least one alkaline earth metal carbonate, especially CaCO3, MgCO3, CaMg(CO3)2 or mixtures thereof andc) oxygen-containing gasare added to the initial charge, where at least 95% by weight of the total amount of iron sulfate used in the process is present in the initial charge a) prior to addition of components b) and c).
Bibliography:Application Number: TW20209101309