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Aspects of Pigment Dispersion related to Usage
Author(s) -
Moll I. S.
Publication year - 1960
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1960.tb02364.x
Subject(s) - flocculation , materials science , dispersion (optics) , pigment , chemical engineering , aqueous solution , mixing (physics) , dilution , fineness , composite material , chemistry , organic chemistry , optics , physics , quantum mechanics , engineering , thermodynamics
Optical and fastness properties are of limited value unless satisfactory dispersion of a pigment can be achieved and maintained. In aqueous systems dispersion and stabilisation can be effected by soluble surface‐active agents, but in non‐aqueous media the degree of stabilisation is much lower. Dispersion of pigments into viscose solution is best achieved by minimising differences existing at the mixing boundary. In pigment printing compositions fineness of particles affects both fabric penetration and pigment binding. Stabilisation of yellow organic pigments with non‐ionic agents is necessary to avoid coagulation of emulsion paints. In non‐aqueous systems mixing procedures are most efficient when conditions allow maximum contribution by the pigment to its own dispersion. The degree of particle flocculation existing in a printing ink is a controlling factor in its behaviour on the paper surface. Seeding arising from milling high‐pigment–low‐resin paint compositions can be reduced by lowering the differential resin concentration at the dilution boundary. Variations in depth of colour caused by differences in film‐forming conditions for paints containing phthalocyanine blue are substantially overcome by surface treatment to reduce flocculation.