Reactive dyesMainly composed of two parts: active group and dye matrix, and the connection of the two parts can be directly connected, or Connected via abutments.
The molecular structure of reactive dyes is a whole. Changes in the structure of each part will be reflected in all aspects of dye performance. As far as the main factors are concerned, the reactivity of dyes and“dyes一fiber” key generally depends on the structure of the active group. The dye matrix often affects the adhesion, diffusion, color, and luster of the dye. Oral light fastness and other factors have no major impact.
Classification of reactive dyes span>
There are two methods: active group or parent structure sort.
（1)According to activityClassification of sexual groups Because reactive groups are an important part of reactive dyes, their structural properties are extremely closely related to the stability, reaction speed, bond stability and related properties of this type of dyes, so the selection of reactive groups is very important. Moreover, groups that are not easy to hydrolyze, have good stability, are easy to combine with fibers and have good stability after combination should be selected as reactive groups in reactive dyes. Commonly used reactive group reactive dyes can be divided into the following categories.
①TripolychlorinecyanoType reactive dye tothreeJuChlorineCyanideas raw materials,Under the appropriate conditionsDownmake it A reactive dye produced by reacting a chlorine atom with the dye parent. The difference in the number of substitutions by chlorine atoms,AlsoCan It is divided into two types: dichlorotriazepine type and monochlorotriazepine type.
a.Ditriazine type foreign PushianMX and other brands, domesticX type reactive dyes belong to this一Class. Also known as ordinary or cold-dyed reactive dyes.
b.Monochlorotriazine type Pushian abroadH.Ciba clone brand, domestically producedKtype of reactive dyes areIn this category, “font-family: Microsoft Yahei;letter-spacing: 0;font-size: 14px”>beingIt is a thermosetting reactive dye.
This dye is less reactive, but more stable Good, it can be heated to boiling without significant decomposition when dissolved. It needs to be at a relatively highhighColor fixation at high temperature.
②Ethylenesulfone Reactive dyes Foreign brands such as Remazol, domestic onesKN-shaped reactive dyes belong to this category.
ethylenesulfonebase It is the reactive group of this type of dye. The reactivity of the dye is between –Chlorotriazepine and dichloro三Among nitrogen-benzene type reactive dyes. Its main characteristics are:: Very stable in neutral solution,It will not happen even if it is boiled Hydrolysis; good stability to acid and good solubility, but“dyed Material fiber“It has poor resistance to alkaline hydrolysis.
③Other reactive group reactive dyes such as double Reactive group type reactive dye; diazepam (pyrimidine) type reactive dye:2,3 dichloroQuinSix-type reactive dyes;2-chlorobenzene, sulfur-nitrogen reactive dyes, etc.. These reactive dyes,Due to the active group structure They are different and have different characteristics, so they can be suitable for dyeing different dyed objects.
(2) Classification by dye matrix. The dye matrix not only gives reactive dyes different colors and vividness. The dye matrix has an impact on the dyeing performance and dyeing fastness. Great influence, so the selected dye matrix must have one or several sulfonic acid groups to make the dye have better water solubility. However, the dye molecules should not be too large, otherwise the dye will not be easily washed out during hydrolysis and will also affect the diffusion of dye molecules inside the caustic fiber. Mainly include ① azo type、②onionQuinoneType、③phthalateJing typeetc.Type of dye matrix.
pan>-Chlorobenzene, sulfur and nitrogen-based reactive dyes, etc.. These reactive dyes,Due to the active group structure They are different and have different characteristics, so they can be suitable for dyeing different dyed objects.
(2) Classification by dye matrix. The dye matrix not only gives reactive dyes different colors and vividness. The dye matrix has an impact on the dyeing performance and dyeing fastness. Great influence, so the selected dye matrix must have one or several sulfonic acid groups to make the dye have better water solubility. However, the dye molecules should not be too large, otherwise the dye will not be easily washed out during hydrolysis and will also affect the diffusion of dye molecules inside the caustic fiber. Mainly include ① azo type、②onionQuinoneType、③phthalateJing typeetc.Type of dye matrix.
