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Abstract To avoid the reaction of calcium iodate Ca(IO3)2 with reducing substances, such as vitamin C (VC) during storage in feeds, microcapsules were prepared by in-situ polymerization with poly (urea-formaldehyde) (PUF) as the shell material and calcium iodate as the core material. Investigate the adsorption behavior of calcium iodate crystals on 3 different types of surfactants (Sodium dodecyl sulfate, cetyltrimethylammonium bromide, octylphenoxypolyethoxyethanol), and observe the effects of 3 types of surfactants on the microcapsule morphology.Optical microscopy, Fourier transform infrared spectrometer and ultraviolet spectrophotometer were used to characterize the microcapsules, and the coating rate and content of calcium iodate were measured. The protective effect of urea-formaldehyde resin on calcium iodate in the Vc solution was tested.The results showed that the adsorption curve of calcium iodate crystals to three kinds of surfactants was s-shaped, and the adsorption amount of CTAB was the highest;The microcapsules prepared with SDBS as surfactant have high enveloped rate, thick wall and regular shape;The intact microcapsule can protect calcium iodate from being reduced by Vc;The coating ratio of microcapsule was 28.6% and the content of calcium iodate was 42.9%.
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Received: 08 January 2021
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2020, Vol. 33 
