How to distinguish wool reactive dyes from acid dyes

Most of the wool reactive dyes are alkaline reactive groups, which react with the amino acids of wool.

Therefore, the wool reactive dye must have a weak alkali dyeing aid before it is dyed. Acid dyes, on the other hand, are dyed in a strong acid environment. Acidic dyes are close to ionization.

Reactive dyes, also known as reactive dyes. It is a type of dye that reacts chemically with fibers during dyeing. This kind of dye molecule contains groups that can react with fibers, and when dyeing, the dye reacts with the fibers, and the covalent bonds are formed between the two to form a whole, so that the washing resistance and friction fastness are improved.

Reactive dyes are a new class of dyes. Advantages of reactive dyes.

Reactive dyes are composed of parent dyes, binding groups and active groups, so that they can form a strong covalent bond with fibers when used, and have a series of characteristics that other cellulose fiber dyes cannot match, and establish their position as the focus of the development and use of dyes for cellulose fibers, which is prominently manifested in the following four aspects:

Reactive dyes are one of the best alternatives to banned dyes and other types of cellulose dyes such as sulfur dyes, ice dyes and vat dyes.

2) Reactive dyes can obtain a high level of firmness, especially wet fastness, with economical dyeing process and simple dyeing operation.

3) Reactive dyes have a wide chromatograph, bright color, excellent performance and strong applicability, and their hue and performance are basically suitable for the requirements of the market for fibers and clothing.

Reactive dye. There are nine main types according to different reaction groups, namely: (1) dichlorotriazine type. For example, China's X-type active focal dridy, foreign products such as Procion

mx。(2) Monochlorotriazine type. Such as K-type reactive dyes in China, foreign products such as Procion

d。(3) Vinyl sulfone type. Such as our KN type reactive dyes, foreign products such as remazol. (4) Monochlorotriazine and vinylsulfone double reactive groups. Such as China's M-type live dyes, foreign products such as Sumifix

supra。(5) Dichlorotriazine type A. For example, China's KE type is a reactive dye, and foreign products such as Procion

h-e。(6) Dichlorotriazine type B. Such as China's KP-type reactive dyes, foreign products such as Procion

sp。(7) Phosphonic acid type. Such as China's p-type reactive dyes, foreign products such as Procion

t。(8) Difluoromonochloropyrimidine.

Type. Such as China's F-type reactive dyes, foreign products such as drimarene

r,drimarene

k。(9) Pyridine carboxylic acid triazine type. Such as China's R-type reactive dyes, foreign products such as Kayacelon.

1. The pH value of the dye bath.

When the pH value of the solution is low, the wool is positively charged, and the wool has more opportunities to combine with inorganic anions (chloride ions or sulfate ions) and dye anions, and the wool is easy to dye.

Therefore, controlling the pH value of the dye bath also controls the amount and speed of wool adsorption dyes. In the dyeing process, adding acid increases the concentration of hydrogen ions in the dyeing bath, making the wool easier to dye, and can be added in batches to achieve the purpose of leveling.

Different acids are selected according to the type of dye reed, such as sulfuric acid for strong acid bath staining, acetic acid for weak acid bath dyeing, and ammonium acetate or ammonium sulfate can be used for neutral bath dyeing.

Second, the addition of electrolytes.

The effect of adding electrolytes during wool dyeing is related to the pH value of the dyeing bath. That is, when the pH value of the dyeing bath is below the isoelectric point of wool, the wool and the dye are mostly combined with salt bonds, and the electrolyte is added to slow the dyeing; When the pH value of the dyeing bath is higher than the isoelectric point of wool, the wool and the dye are mostly combined with hydrogen bonds and van der Waals force, and the electrolyte is added to promote dyeing.

3. Temperature. The relative molecular weight of acid dyes is about 300 800. At general staining concentrations and at room temperature, the dye rarely aggregates.

However, the acidic dyes dyed in the weak acid bath and neutral bath will aggregate at room temperature, and only higher temperatures or even boiling dyeing can be used to reduce the aggregation tendency of the dye.

The greater the tendency of dye aggregation, the more significant the effect of temperature. Increasing the temperature can also promote the wool puffing, which is conducive to the diffusion of the dye to the inside of the fiber, and when it is above 50, increasing the temperature has a significant effect on the fiber puffing.

The scale layer of wool is a great obstacle to the diffusion of the dye, so dyeing needs to be boiled and extended. In order to avoid uneven dyeing, the dyeing temperature should be low at the beginning of the dyeing, and then gradually heated to boiling. Controlling the temperature rise is important for leveling.

Summary. According to your question, what Xiaoyu will give you here is: The leveling agent used to dye wool with weak acid dyes generally has:

1. Sodium ammonium glucosamate: it can increase the coloring strength of the dye on the wool, so that the dye can better penetrate into the fiber, thereby improving the coloring stability and wear resistance of the dye. 2. Trisodium phosphate:

It can promote the tinting strength of the dye, improve the fixation force of the dye, and make the dyeing more stable. 3. Sodium bicarbonate: it can inhibit the oxidation and fracture of the dye, make the dyeing strength of the dye stronger, and make the dyeing more stable.

4. Sodium sulfate: It can enhance the coloring strength of the dye, so that the dye can evenly penetrate into the fiber, thereby improving the coloring stability and wear resistance of the dye. 5. Sodium polyphosphate:

It can promote the penetration of the dye, enhance the tinting strength of the dye, and make the dyeing more stable. Dear, I hope mine can help you! Have a great day!

I'm sorry I don't understand, but can you elaborate on that?

According to your question, what Xiaoyu will give you here is: the leveling agent used for dyeing wool with weak acid dyes generally has: 1. Sodium ammonium glucogluconate:

It can increase the tinting strength of the dye on the wool, so that the dye can better penetrate into the fiber, thereby improving the dye's dying stability and abrasion resistance. 2. Trisodium phosphate: it can promote the coloring power of the dye, improve the fixation force of the dye, and make the dyeing more stable.

3. Sodium bicarbonate: it can inhibit the oxidative fracture of the dye, make the coloring strength of the dye stronger, and make the dyeing more stable. 4. Sodium sulfate:

It can enhance the tinting strength of the dye, so that the dye evenly penetrates into the fiber, thereby improving the dye's coloring stability and abrasion resistance. 5. Sodium polyphosphate: it can promote the penetration of dyes, increase the coloring power of strong dyes, and make dyeing with rotten relatives more stable.

Dear, I hope mine can help you! Have a great day! 

It is recommended to use acidic dyes or reactive dyes.

The synergistic effect of reactive dyes two baths dyeing wool. A large number of reactive dyes were selected to dye the wool first, and then the disperse dyes were used to overdye, and by measuring the soaping fastness and dyeing effect, it was found that the reactive dyes of some structures dyed wool greatly improved the dyeing performance of disperse dyes on wool, so that the dyed wool had excellent wet fastness, uniform dyeing and deepening effect. Reactive dyes form covalent bonds with wool fibers to give wool color, and compared with undyed wool, the dyeing properties of wool change greatly, making disperse dyes easier to dye and dye wool, and the fastness is also significantly improved.

Dyes such as acid dyes traditionally used for wool dyeing have problems in terms of wet fastness, color brightness and environmental pollution. New dyes and dyeing methods are being studied and applied at home and abroad.

Generally, acid dyes are used, but it is easy to dye flowers, be very careful, the temperature should be appropriate, below 70 degrees in the degree minutes, 70-90 with 1 degree minutes, 90-100 degrees for minutes, keep warm for 45-90 minutes, add acidic leveling agent, but do not add acetic acid-sodium acetate or ammonium sulfate as a buffer, you can add pH value sliding agent (such as Wuxi Evergrande Xijin Chemical production of PH value sliding agent H-2197) 1-2g L, the effect is very ideal.

It is best to use natural plant dyes. Both are natural and blend better.

Wool dyes are generally dyed with acid dyes!

Reactive dyes or acid dyes are fine.

Strong acidic dyes.

The earliest development of an acid dye, required to be dyed in a strong acid dyeing bath, its molecular structure is simple, the molecular weight is low, contains sulfonic acid group or carboxyl group, the affinity for wool is not large, can be evenly moved on wool, dyed evenly, so it is also called acid leveling dye, but the color light is not deep, the washing fastness is poor, and the wool is damaged during dyeing, and the wool feel after dyeing is poor. Such as Acid Red G (i.e. Acid Red 1).

Weakly acidic dyes.

Weakly acidic dyes are generated by increasing the molecular weight, introducing aryl sulfone groups or introducing long carbon chains in strongly acidic dyes. The molecular structure is more complex, the affinity for wool is larger, it can dye wool in weak acidic medium, there is no damage to wool, the color light is deeper, and the fastness is improved, but it is not uniform. Such as weakly acidic brilliant blue raw (i.e. acid blue 80).

Acidic medium dyes.

After being treated with certain metal salts (such as chromium salts, copper salts, etc.) as mordants, acid dyes that form metal complexes on fabrics. The mordant dyeing procedures are more complicated, but you can get dyes with better performance such as light resistance, washing resistance, and friction fastness, such as acid medium black T (i.e., medium black 11).

Acidic complexing dyes.

It is formed by the complexation of certain acid dyes with metals such as chromium and cobalt. Soluble in water, its dyes have excellent lightfastness and lightfastness. Its dye parent is similar to an acidic medium dye, but in the preparation of the dye, metal atoms have been introduced into the azo dye molecule, and the ratio of the metal atom to the dye molecule is 1:

1, so it is also known as 1:1 metal complex dye. There is no need to use mordant for dyeing.

Such as acid complex yellow gr (i.e. acid yellow 99). Another type of acidic complex dye molecule does not contain sulfonic acid groups, but contains sulfonamide groups and other hydrophilic groups, and the ratio of metal atoms to dye molecules in the molecule is 1:2, so it is also called 1:

2. Metal-complexed dyes. It is dyed in neutral or weakly acidic media, so it is called a neutral dye. Such as neutral gray 2BL (i.e. acid black 60).

Acid dyes include azo type, anthraquinone type, triaryl methane type, etc., but most of them belong to azo dyes. The production of acid complex dyes is similar to that of general dyes, but a process of complexing with metals must be added, such as neutral ash 2BL, which is first diazotized by 2-aminophenol-4-sulfonamide, coupled with 1-acetamino-7-naphthol, and then complexed with sodium chromium salicylate.

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Linyi Donglong Dye Technology Co., Ltd. independently produced acidic, cationic and other dyes in 1988.

Introduction: Acid dyes are a class of water-soluble dyes with acidic groups on the structure, which are dyed in acidic media. Most of the acid dyes contain sodium sulfonate salt, which can be soluble in water, with bright color and complete chromatography.

The acid dye chromatography is complete, the color is bright, and the fastness to sunlight and wet treatment varies greatly with different dye varieties. Compared with direct dyes, acid dyes have a simple structure and lack a long common double bond and a homoplanar structure, so they lack directness to cellulose fibers and cannot be used for dyeing cellulose fibers. Different types of acid dyes have different dyeing properties due to their different molecular structures, and the dyeing methods used are also different.

Classification: Acid dyes are divided into strong acidic, weakly acidic, acidic medium, acidic complexing dyes and so on according to their different chemical structures and dyeing conditions.

Uses: Mainly used for wool, silk and nylon dyeing, can also be used for leather, paper, ink, etc. It generally has no tinting strength for cellulose fibers.

Introduction: Basic dye, basic dye(s), also known as salt-based dyes. Dyes that can be dissociated to form cationic pigments in aqueous solution, so they are classified as cationic dyes.

It is characterized by bright color, magnificent fluorescence (mainly rose, yellow, orange and other colors), and strong tinting strength, with a small amount of dye can obtain a deep and intense color. The color fastness and light fastness are poor, but it has good fastness to acrylic fiber (polyacrylonitrile fiber). Basic dyes do not color cellulose fibers.

Uses: Due to the poor color fastness to light and washing after dyeing fibers with alkaline dyes, it is now rarely used for dyeing fabrics, mainly used for coloring and manufacturing lakes of stationery and paper.

Summary. Hello, glad to answer for you. The pH value of neutral dyes wool is generally acidic dyes, but it is easy to dye flowers, be very careful, raise the temperature to the appropriate source, below 70 degrees in the degree of 2113 minutes, 70-90 with 1 degree minutes, 90-100 degrees for minutes, keep warm for 45-90 minutes, add acid 5261 leveling agent, but do not add acetic acid-sodium acetate or ammonium sulfate as a buffer, you can add pH sliding agent (such as Wuxi Evergrande Xijin 4102 chemical 1653 ph sliding agent H-2197) 1-2g l, the effect is very ideal.

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Hello, I'm glad to answer for you. The pH value of neutral dyes wool is generally acidic dyes, but it is very regrettable that Hu Yi dyes flowers, be very careful, raise the temperature to the appropriate source, 2113 minutes below 70 degrees, 70-90 degrees with 1 degree minutes, 90-100 degrees with minutes, keep warm for 45-90 minutes, add acid 5261 sex leveling agent, but do not add acetic acid-sodium acetate or ammonium sulfate as a buffer, you can add pH sliding agent ( For example, Wuxi Evergrande Xijin 4102 Chemical Engineer 1653 produced the pH level of the pre-shot sliding agent H-2197) 1-2g L, the effect is very ideal.

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