Research In Ultrasonic Wave Applied In Apocynum Venetum-Fiber Dyeing Process

Ultrasonic wave has been applied in the dyeing process of the Apocynum Venetum-fiber in order to improve the dye-uptake and accelerate the dyeing rate. The mechanism has been investigated and discussed. The normal method is firstly used to study the dyeing property of the Apocynum Venetum-fiber dyed with the reactive dyes, the direct dyes and the vat dyes, correspondingly, the ultrasonic wave is applied in the dyeing process of each dye. Then the result and the mechanism of the ultrasonic wave dyeing is investigated. The main research aspects are as follows:1. Under the optimum dyeing condition which including the ultrasonic wave used in the dyeing process and not used in the dyeing process of each dyes, the dyeing property of the reactive dyes (Reactive Black KN-GARC, Reactive Yellow X-R), the direct dyes (Direct Red 12B, Direct Yellow RS) and the vat dyes (Vat Green B, Vat Blue GCDN) dyed the Apocynum Venetum-fiber is studied in detail. The dyeing rate curves are figured out and the dye-uptake rate is calculated orderly. The result of the research shows that the ultrasonic wave applied in the dyeing process can increase the dyeing rate of each dyes, can obviously decrease the dyeing time, can increase the dye-uptake rate , improve even and permeate effects of each dyes.2. The mechanism of the ultrasonic wave improving the dyeing effect is discussed. The X-ray diffraction method is used to measure the crystal linity, the crystal size and the tropism percentage of the fiber treated and untreated with the ultrasonic wave. Then every X-ray diffraction curve is figured out. The result shows that the crystallinity, the crystal size and the tropism percentage of the Apocynum Venetum-fiber which has been treated with the ultrasonic wave for 30 minutes is decreased. Then this mechanism of the ultrasonic wave is studied and discussed.3. The function of the ultrasonic wave on dyeing liquor is studied in the end. The research shows that the particulate size of Vat Green B (C. I.Vat Green 3) in the dyeing liquor has been sharply decreased after treated with the ultrasonic wave for 30 minutes, the diffusing coefficient and the permeating coefficient of the dyes are increased. The same conclusion is found on the research of the direct dyes and the reactive dyes.