Measurement of Particle Size Distribution of Phthalocyanine Blue by Centrifugal Sedimentation Method
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概要
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The pretreating and centrifugal conditions which are necessary for the measurement of particle size distribution of phthalocyanine blue by the ICI/Joyce Loebl disc centrifuge are described.<BR>To determine the optimum pretreating condition for the aqueous phthalocyanine blue dispersion, the dispersing conditions by a mixer or the ultrasonic wave (treating time, 'rotation number of mixer, ultrasonic output power, etc.) and the change in dispersibility with time are investigated in the presence of Triton X-100 as a suitable dispersing agent. Further, the effects of the components of the dispersion medium and the spin fluid on the dispersibility in the "buffered layer" technique are investigated and the particle size distributions obtained under the suitable condtions thus selected are compared with that of the homogeneous technique. Ultrasonic wave treatment by high output power (above 400W) and for long time (one hr. or more) in the presence of an appropriate amount of a suitable dispersing agent is highly effective, or probably essential for obtaining the most stable and the best dispersion of the pigment consisting of primary particles. In the case of the dispersion pretreated as above, the change in dispersibility with time is not observed. The particle size distributions of the pigment obtained under the suitable conditions of the "buffered layer" technique coincide well with that of the homogeneous technique. It is further confirmed by the electron microscopic observation and BET nitrogen adsorption method that the particle size distribution of the primary particles is obtained under the proper conditions only of applying ultrasonic wave pretreatment of extremely high power and long time.
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