International. In a new study, scientists at Nanjing University of Science and Technology, China, prepared and characterized yellow pigment C.I. 12 encapsulated by ball grinding and polymerization in miniemulsion.
The purpose of a recently published work is to encapsulate the aqueous dispersion of the nanoscaled Yellow Pigment C.I. 12 (PY12) with butyl styrene-acrylate resin by polymerization in miniemulsion, the dispersion of PY12 was prepared by grinding balls in the presence of dispersing agent. Extensive analyses were performed to characterize the encapsulated pigments, including TEM, FTIR, UV-vis absorption, CIE L*a*b* color scales, encapsulation efficiency, and UV weathering. The TEM images revealed that the composite particles exhibit a transparent core-layer structure, the uniformity of particle size and encapsulation integrity of encapsulated particles prepared by ultrasonic scattering are superior to those prepared by high-speed shear scattering.
In addition, the FTIR analysis showed that the organic pigment was actually incorporated into the resin layer, but was not simply doped or physically absorbed on the outside. When the PY12 content of the encapsulated particles was 0.6 g, the luminosity value (L*) and yellow value (b*) of the sample reached the maximum and the color performance was the best. The characterization of the encapsulation efficiency revealed that the dispersion and encapsulation efficiency of ultrasonication is higher than that of the high-shear homogenizer, the UV resistance capacity and color stability of the encapsulated PY12 were better than those of the original pigment.
Source: https://www.sciencedirect.com
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