Chemical Degradation And Microencapsulation Of Reactive Brilliant Red M-3BE

Chapter 1:Reactive molecules in reactive dyes have a strong reactive ability with the hydroxyl of cellulose fibers, amino on polyamide fibers and hydroxyl amino on the protein fibers to form carboxyl covalent bonding. Reactive dyes have been gradually become one of the major dyes. This chapter reviewed the relationship between color and structure of reactive dyes, most used degradation reducing agent and microencapsulating of reactive dyes.Chapter 2:UV-visible molecular absorption spectrometry (UV-Vis) and fluorescence spectroscopy were use to study the spectral characterization at different pH of Reactive Brilliant Red M-3BE, combined with spectral data analysis of its structural features and stability to acid and alkali. And electrochemical analysis method was introduced to determine its redox potential. Absorption spectra of Reactive Brilliant Red M-3BE in aqueous solution showed three absorption bands at 542,289 and 218nm. Fluorescence excitation and emission wavelengths were 522 and 600 nm. Within the pH 2～12, Reactive Brilliant Red M-3BE has no significant changes showed a certain acid stability, and when pH above 12, the spectral changed significantly, showed that the chromophore structure changed in alkali solution.Chapter 3:In the literature several types of sulfur compounds have been selected as reductive degradation agents on the degradation activity of Reactive Brilliant Red M-3BE. Study proved that sodium sulfite, sodium hydrosulfite, sodium thiosulfate and the FAS could not be used alone to the degradation of Reactive Brilliant Red M-3BE, only when FAS and NaOH are used together can produce degradation effect. The mass ratio of FAS and NaOH is 5:2. FAS amount is 60 times of the concentration of Reactive Brilliant Red M-3BE. The degradation time of FAS-NaOH mixed solution is around 10 minutes. The degradation effect can last for no more than 12 hours when exposed at room temperature while more than 20 days hours when under sealed conditionsChapter4:In-situ polymerization and aqueous phase separation of the Reactive Brilliant Red M-3BE for microcapsule inclusion were used. The theory of double emulsion was introduced to the preparation of microcapsules to overcome the difficulty of microencapsulation of water-based system. Firstly, water-based system was emulsified in the oil phase with the formation of W/O system. The formation of oil-based system can use the ordinary methods of microencapsulation to solve the problem of double emulsion stability. Diameter of Reactive Brilliant Red M-3BE microcapsules were between 10～40μm in aqueous phase separation route, and between 5～50μm in in-situ polymerization route with a better package combined effect.