Preparing technics and decoloring mechanism analysis of high-grade dispropriated rosin decoloration

Aimed at the over tint problem of disproportionated rosin in present domestic market, SQH-9 was used as a new decloring reagent, in order to deoxidize and refine disproportionated rosin, which was produced by Guangxi Wuzhou Rosin Ltd. The best decloring technic conditions were decided, including temperature, time and the dosage of decloring reagent, and the decloring mechanism was analyzed with UV as well as IR analyzing methods. Experimental results show that under the best decloring technics, SQH-9 decloring reagent can reduce the Garner color of first-class disproportionated rosin from 7 Garner color number to 2, while reducing the superfine disproportionated rosin from 5 Garner color number to 2, and the UV absorbing curves of ethanol solutions of disproportionated rosin declored by SQH-9 are basically superposing with that of the disproportionated rosin imported from Japan. Also SQH-9 is cheap and available in domestic market, it has good applying prospect in rosin industry.