The direct dye dyeing method of ready-to-wear is suitable for all cotton eddy cloth, half-wall, full-wall or indigo denim. The direct dye dyeing method of ready-to-wear is a new concept of ready-to-wear dyeing. , Selective dyes and additives can produce satisfactory effects at will.
1. At the seam line, the inlays and protruding parts can show a strong sense of contrast
2. The surface with peach skin fluff and the soft feel
3. Good washing and sun-drying firmness
Overall, the ready-to-wear direct dye dye It is an important part of any cotton fabric, regardless of thickness or fabric.
Direct dyes have a strong affinity for cellulose fibers such as cotton, viscose, ketone ammonia, etc. When dyeing, you can dye directly without adding any mottled agent, so it is called a direct dye.
Direct dye can directly dye protein fibers such as silk, wool and synthetic fibers such as nylon in neutral or weak acidic baths, and can also be used for dyeing mixed textiles such as sticky/wool, sticky/breast.
Direct dyes are classified according to their chemical properties, mainly azo dyes. In terms of application habits, dyes with a sun-resistant fastness of level 4 or above are generally called direct sun-resistant dyes; copper salt is used as The direct dye that is post-treated is called direct copper salt dye; while the dye that requires post-treated diazonium dye is called direct diazonium dye.
Since the direct dye structure contains hydrophilic groups such as sulfonate or carboxylate, the water washing fastness is poor. Usually, post-treatment is done with metal salts or color fixatives, which can improve various dyeing fastness to varying degrees.
Simple application of direct dyes; complete chromatography; low price; good uniformity; wide application range. Therefore, it is widely used in the washing and dyeing industry. Commonly known as dyed cotton dye.
1. Properties of direct dyes
(1) Direct dyes are mostly powdery, and dye molecules have hydrophilic groups, so they are easily dissolved in water, and aqueous solutions are generally For clarification.
(2) Adding alkali agents to the dye solution, such as soda ash, can increase the solubility of the dye, thereby reducing the dye’s coloring speed on the fibers and producing a slow dyeing effect.
(3) Adding salt or Yuanming powder to the dye solution can reduce the solubility of the dye to water, thereby increasing the affinity of the dye to fiber, shortening the dyeing time, and producing a dye-promoting effect. Adding excess salt or Yuanming powder to the concentrated solution can cause the dye to salt and precipitate.
(4) Most direct dyes are produced when they encounter magnesium and calcium salts and precipitate from solution. The product is difficult to dissolve in water and consumes dyes. Therefore, soft water is usually required for dyeing.
(5) Generally, direct dyes (azo) are decomposed with reducing agents, destroying the azo group of the chromophore, and forming colorless amino compounds.It cannot be oxidized to restore it, causing the dyed fabric to lose its color. The color remover developed by “Chinese Washing and Dyeing” is made based on this principle.
(6) The properties of the above direct dyes are common to direct dyes. Since many operators of dyeing shops are not professionals, it is difficult to operate correctly, and the knowledge about dyeing cannot be short-term. It is mastered within time, so the Chinese Institute of Washing and Dyeing Technology has developed a special dye suitable for garment counter-dye based on the particularity of garment counter-dyeing.
<br / 2. Main products of direct dyes
<br / (1) Chinese products: Direct grass yellow, direct apricot yellow, direct peach rosy, direct big red, direct snow green
<br / Dirty blue Direct golden camel (yellow brown D3G) Direct grass green Direct smoke
Direct deep smoke Direct sky blue Direct gray Direct blue 2B Direct black G
Direct sun resistant G Direct lake Blue 5B Direct Green BE
Direct Copper Salt Blue 2R Direct Sun-resistant Emerald Blue Direct Sun-resistant Tender Yellow
Direct Red Green Lotus (Purple R) Direct Sun-resistant Fruit Green
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(2) Other products: In my country, there are many manufacturers that produce dyes, and the product performance varies. For washing and dyeing shops with weak professional knowledge, it is difficult to use and dyeing accidents are inevitable. Therefore, I will not introduce them one by one here.
3. Dyeing method of direct dye
Direct dye developed after Bautiago discovered Congo red in 1884. Because they can dye cotton fibers directly without mock agents, they are called direct dyes. The ability of dyes to dye fibers directly is called directness.
Since most washing and dyeing shops are small workshop-style operations, they have neither professional knowledge nor large-scale professional equipment. Therefore, many domestic washing and dyeing companies have developed a variety of clothing dyeing units based on the situation of many domestic washing and dyeing shops to meet their needs.
1. Dyeing cotton fabrics
(1) Weak alkaline bath:
Light color, medium color, dark color
Dye% 0.2-0.6 0.6-1.5 1.5-2.5
Solan ash% 0.5-1 1-2 2
Yuanming powder% 5-10 10-20 20 -30
Bath ratio 1:20-1:30
（2）Neutral bath
Light color medium color dark color
Dye% 0.2-0.6 0.6-1.5 1.5-2.5
Yuanming Powder% 5-10 10-20 20-30
Bath ratio 1:20-1:30
Dyeing method:
1. First dissolve the dye and additives in an appropriate amount of hot water, and add Clean water makes the dye liquid the required bath ratio (ie, the dye liquid is 20 to 30 times the dye liquid is 20 to 30 times the dye). Immerse the dyestuffs that have been soaked and moist (old clothing needs to be treated with color difference) into the dyeing tank to dye. Keep heating while constantly turning, so that the temperature gradually rises to 85-95 degrees Celsius. Continue dyeing for 30 minutes, wait for the temperature to drop slightly, take it out. Wash the float with clean water, dry or dry.
2. Dyeing viscose and ketoammonia fabrics
Direct dyeing viscose fibers and ketoammonia fibers is roughly the same as the cotton fiber method. Therefore, the coloring of fibers is stronger, that is, the direct dye has a high affinity for viscose and ketone ammonia fibers, especially the affinity for ketone ammonia fibers, so it is not suitable for uniform dyeing. Therefore, when dyeing such fibers, light colors are not Add dye aid agent, and the amount of dark dye aid agent is also very small. An appropriate amount of penetration agent and uniform dye should be added to achieve the effect of uniform dyeing, and the amount of dye used is also appropriately reduced. Light medium-dark color
Dye % 0.1-0.5 0.5-2
Permetic agent g/liter 1-1.5 1-1.5
VI Sodium metaphosphate/liter 0.5-1 0.5-1
Yuanming powder/liter 1-4
Emotional dyeing agent % 0.1-0.4
/> Bath ratio 1:20-1:30
Dyeing method:
Full dissolve the dye and additives, add dye bath, and add clean water to the required bath ratio. The dyeing temperature is 40 degrees Celsius. After continuous turning, it gradually heats up to 80-95 degrees Celsius (add Yuanming powder if necessary), then continue dyeing for 1-1.5 hours, cool down to 60-70 degrees Celsius and take it out, wash the float and dry it Or dry.
3. Dyeing of silk fabrics
(1) Acid bath
Light color medium color dark color
Dyeing % 0.5-1 1-2 2-3
Acetic acid (30%) 0.5-1 1-1.5 1.5-2
Or ammonium acetate % 0.2-0.4 0.4-0.6 0.6-0.8
Bath ratio 1:30 -1:40
（2） Neutral bath:
Light color medium color dark color
Dye % 0.5-1 1-2 2-3
Glodge/liter 0.5-1 0.5-1 0.5-1
Yuan Minfenke/1-2
Bath ratio 1:30-1:40
Dyeing method:
First use an appropriate amount of hot water to make the dye and help The agent is fully dissolved in the dye bath, and add water to make the dye liquid the required bath ratio (that is, the dye liquid is 30 to 40 times the dye liquid). When the dye bath temperature is 40 degrees Celsius, immerse the soaked and moistened dye. In the dye bath (old clothing needs to be removed from color difference), continue to heat while constantly turning, heat up to 90-95 degrees Celsius within 15-20 minutes, continue dyeing for 45 minutes, take it out and wash it with clean water and dry it.
Note: (1) If continuous dyeing is required, the soaked and moistened dye can be immersed in the dye bath to dye.
(2) Add 2-3 times, that is, a small amount and multiple times.
(3) When neutral bath dyeing is dark, after 15 minutes of dyeing at 90-95 degrees Celsius, the Yuanming powder must be added before the temperature is reduced to 70-80 degrees Celsius, and then the temperature is increased to 90- 95 degrees Celsius, continue dyeing for 30 minutes.
4. Dyeing of adhesive/wool blended fabrics
There are two methods for direct dyeing of adhesive/wool blended fabrics, namely one bath method and two baths Law. One bath method mostly uses dyes that can dye the same color on wool and viscose fiber. The two-bath method is to dye acid dyes and direct dyes on wool and viscose fibers respectively to achieve the goal of consistent color. The two-bath method should be used to choose a direct dye variety with very few wool sticky colors.
(1) One bath method (2) Two bath method: After the acid dye is dyed with wool, use alkali liquid to adjust the pH value to neutral or weak alkaline, and then Dye viscose with direct dye. When dyeing, an appropriate amount of dyeing agent can be added to control the dyeing rate to achieve the purpose of uniform dyeing.
5. Dyeing of sticky/breast blended textiles
Most varieties of direct dyes are suitable for dyeing of sticky/breast blended textiles, and their dyeing methods mostly use neutral or weak acidic baths. Law.
Light medium-dark
Dye% 0.5-1 1-3
Permetic agent% 0.5-1 0.3-0.5
Yuanming Powder % 0-10 10-15
Aminosulfate % 0.5 0.5-1
Glial acetic acid % 0.5 1
Bath ratio 1:30~1:40
Dyeing method:
Add appropriate amount of hot water to dissolve the dye and additives fully, and then add the dye bath, add clean water to The required bath ratio. The dyeing bath temperature starts to dye at 30℃. After continuous turning, it gradually heats up to 95℃ within one hour. Continue to dye for 30 minutes and cools down to 60-70℃, wash with clean water to fix the color
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