2 edition of reactions of reactive dyes with wool. found in the catalog.
reactions of reactive dyes with wool.
Written in English
Thesis (Ph.D.)--The Queen"s University of Belfast, 1980.
|The Physical Object|
Covalent bonding is the one of the most basic and strongest types of chemical reactions. This reaction happens gradually over time depending on temperature and/or the Ph level of the surrounding environment. Higher pH speeds the reaction, as does heat. But with the cooler water Procion type dyes, too much heat can cause the colors to actually not bond. Reactive dyes current account for about 5 % if the wool dyes market. The largest dye group is the chrome dye class with 31 % of the market but globally there are increasing concerns about the environmental impact of the group of the dyes they have excellent fastness properties however and only the reactive class comes close in the : Ruma Chakrabarti.
Reaction to alkalis: Wool is quickly damaged by strong alkalis. Reaction to acids: 1. Wool is damaged by hot sulphuric acid. 2. The fibre is not affected by other acids. Affinity for dyes: Wool fibre has high affinity for certain types of dyes, i.e. Acid, reactive dyes, Basic dye 5. Fiber reactive dyes such as Procion MX, Cibacron F, and Drimarene K can also be used as acid dyes on wool; see Reactive dyes on protein fibers. Natural dyes. Many natural dyes work very well on protein fibers, such as wool. Most will require a mordant, such as alum, copper, tin, or iron, so they are not necessarily more on-toxic than synthetic. The effect of urea on formation and cleavage of a covalent bond between a reactive dye and cellulose has been investigated. The evidence presented is consistent with the view that urea increases the bonded dye yield by keeping the reactive dye in solution during the diffusion of the dye to its reaction Cited by:
Although Acid dyes are usually recommended for protein fibres, you can also use Procion MX fibre reactive dyes (here is the fibre reactive dye recipe for cellulose fibres). Even old dyes continue to work well on wool. Some of the colours will dye more true to type than others. In particular some blues produce unexpected results. PRO MX Reactive Dyes (Procion) are designed to permanently dye cellulose fibers - plant based fibers like cotton, linen, ramie, hemp, viscose rayon, bamboo, jute, paper, wood, basket reed, even silk at room temperature, 75 - 95 F (24 C to 35 C). They also dye protein fibers like wool, using acid at . Dye - Dye - Dyeing techniques: Direct, or substantive, dyes are applied to the fabric from a hot aqueous solution of the dye. Under these conditions, the dye is more soluble and the wettability of natural fibres is increased, improving the transport of dye molecules into the fabric. In many cases, the fabric is pretreated with metallic salts or mordants to improve the fastness and to vary the.
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SyntaxTextGen not activatedIt pdf not until the early s, following the marketing in by Hoechst of two Remalan (HOE) vinylsulphone dyes capable of reacting with wool, that ICI was successful in devising a reactive dyeing process that enabled cellulose to be dyed with a trichromatic mixture of dyes under practical conditions.This article is written for high school chemistry teachers who wish to introduce the activity of tie dyeing to show download pdf application to organic chemistry.
It discusses the processes and the chemistry involved in the various steps of tie dyeing fabric with procion MX (dichlorotriazine), a commonly used fabric reactive dye. The preparation of the solutions, the purpose of each chemical, the Cited by: 3.Reactive dye, any of a class of highly coloured ebook substances, primarily used ebook tinting textiles, that attach themselves to their substrates by a chemical reaction that forms a covalent bond between the molecule of dye and that of the fibre.
The dyestuff thus becomes a part of the fibre and.