Dissertation > Excellent graduate degree dissertation topics show

Study on the Mechanism of Cold Pad Batch Dyeing of Silk Fabric with Heterobifunctional(MCT/VS) Reactive Dyes and Alkali

Author: JiangJianTang
Tutor: ShenYiFeng
School: Zhejiang University of Technology
Course: Textile Chemistry and Dyeing and Finishing Engineering
Keywords: Cold pad batch dyeing Silk Different bifunctional reactive (MCT / VS) reactive dyes Hydrolysis reaction Nucleophilic reactions Colorimetry High Performance Liquid Chromatography Fixing alkali
CLC: TS193.632
Type: Master's thesis
Year: 2010
Downloads: 81
Quote: 0
Read: Download Dissertation

Abstract

Cold pad batch dyeing of silk is one of the key technologies to achieve less water and energy staining. Research group pre-batch dyeing process through silk cold-rolled and cold pad batch dyeing equipment transformation, industrialization cold pad batch dyeing silk. Cold pad batch dyeing process with the bath of dye with alkali agent, reactive dyes inevitable to happen in the course of hydrolysis, and Silk reactive groups of reactive dyes, fixed rate stability there is a certain problem; while real silk cold pad batch dyeing common fixing alkali contain large amounts of sodium silicate, although sodium silicate has a good buffering capacity, dye fixing rate, but sodium silicate has adhesiveness, it will affect the fabric handle and on the device contamination. Therefore, this paper conducted a study of reactive dyes in the cold pad batch dyeing conditions hydrolysis performance and reaction with nucleophilic groups fibroin performance, batch dyeing process to provide theoretical guidance for the silk cold-rolled; research and development of new silk cold rolling heap the fixing alkali, has a certain significance to improve the quality of real silk. Silk cold-rolled heap dyeing different bifunctional reactive (reactive dyes containing a chlorine triazinyl and sulfuric acid ester ethyl sulfone) (CI Reactive Blue 222) as the object of study, the use of high performance liquid chromatography (HPLC) and colorimetric different pH values ??at room temperature (20 ℃ ~ 40 ℃) Hydrolysis of the study. The results show that: the alkaline solution at room temperature, the sulfuric acid ester ethyl sulfone first elimination reaction to generate a vinyl sulfone group, and then each of the vinyl sulfone group, and a chloro-triazinyl hydrolysis reaction; but the hydrolysis reaction is not balanced, vinylsulfonyl preferred hydrolysis, elevated temperatures or alkaline increased a chloro-triazinyl and then hydrolysis, hydrolysis of hydrolyzable are generated with the time the vinyl sulfone group, and a chloro-triazinyl dyes. Studied by simulating the reaction the main nucleophilic groups on CI Reactive Blue 222 silk fibroin in silk cold-rolled piles set different pH values ??of the reaction temperature (30 ℃) performance, choice isopropylamine, p-cresol and methanol were simulated silk fibroin its structure similar to the side-chain amino and phenolic hydroxyl and alcoholic hydroxyl. The results show that: CI Reactive Blue 222, the aminolysis reaction the optimum pH value of from 10 to 12; phenolysis reaction of the suitable pH value of from 10 to 11; alcoholysis reaction the optimum pH value is about 11. CI Reactive Blue 222 silk fibroin mainly nucleophilic groups of the comprehensive response capability Sort amino gt; phenolic hydroxyl gt; alcoholic hydroxyl group. According to the distribution and content of dyes with nucleophilic groups reaction and nucleophilic groups on the silk fibroin, determined at 30 ℃, CI Reactive Blue 222 Silk optimum pH of the reaction is 10 to 11, and by true silk cold pad batch dyeing experimental validation. The study also found that different reactive dyes and silk fibroin nucleophilic groups mimetic response capability is not the same, of isopropylamine with different reactive dyes reactive order: different double Reactive Dyes (CI Reactive Blue 222) gt; sulfate ethyl sulfone reactive dye (CI Reactive Blue 19) gt; chloro-s-triazine reactive dyes Red 24 (CI activity); cresol with different reactive dyes reactive order: monochloro triazine reactive dye (CI activity Red 24) gt; the different bifunctional reactive reactive dyes (CI Reactive Blue 222) gt; sulfuric acid ester ethyl sulfone reactive dye (CI Reactive Blue 19); reaction order of methanol with different reactive dyes: a Monochlorotriazine activity dye (CI Reactive Red 24) gt; different the Dual Reactive Dyes (CI Reactive Blue 222) gt; sulfuric acid ester ethyl sulfone live dye (CI Reactive Blue 19). The experiment also found that different double Reactive Dyes (CI Reactive Blue 222) vinyl sulfone hydrolysis hydrolysis dyes, monochloro triazine-based still be able to continue with the nucleophilic groups react. Fixing alkali used for cold pad batch dyeing of silk containing the defect, according to the experimental results of the nucleophilic reaction of the sodium silicate, developed a new type of sodium silicate-free silk cold rolled heap fixing alkali. The alkaline agent has a good pH buffer performance, deep color yield, dyed fabrics feel good.

Related Dissertations

CLC: > Industrial Technology > Light industry,handicrafts > Textile industry,dyeing and finishing industry > Dyeing and finishing industry > Dyeing > A variety of dyeing methods > Synthetic dye staining method > Reactive dyeing methods
© 2012 www.DissertationTopic.Net Mobile