CIPDB › China Industry › Chemicals › Pigment & Dye

Reactive Dyes Dyestuff Dyes Ground Color Discharge Print Series¹

Preview:

Product Description Product IntroductionWe have annual production capacity of more than 150,000 tons, including 100,000 tons of disperse dyestuff and 30,000 tons of reactive dyestuff. Reactive Dyes: Ground color Discharge print seriesNo.Dye NameGround color(Pad dyeing60g/l)Whitedischargesolubilityg/l(50oC)Sunlightfastness(Xenon lamp)(1/1)Washingfastness(CH/CO)Sweatfastness(Alkali)Rub fastness(Dry/wet)IronfastnessFastness tochlorine water1Reactive Bright Yellow GD 1804-54-544-54-544-53-42Reactive Yellow GD 1604-54-544-54-544-53-43Reactive Golden Yellow 2RD 20064-544-54-544-534Reactive Orange 5RD 18064-5443-4353-45Reactive Scarlet 2GD 2004-543-44-543-44-536Reactive Rosy Red 2BD 1604-54-544-54-544-53-47Reactive Red BD 160443-4443-4438Reactive Brilliant blue GD 1804-54-544-54-5443-49Reactive Deep blue GD 1204-54-544-54-5443-410Reactive Navy blue BD 1804-54-544-54-544-5311Reactive Black RD 2004-54-544-54-534-53-412Reactive Black GD 20054-544-54-5353-4 Ground color Discharge print seriesProcess flow of Reactive Dye Ground color Discharge print:Ground color dip dyeing or Pad dyeing ---→ stentering ---→ printing ---→ Drying ---→ Steaming ---→ Countercurrent boiling wash ---→ post-processingDischarge print method:1, White discharge paste 2, VAT Dye discharge paste Rongalite150g Discharge reduction DyeXg Water150g Rongalite100-200g potassium carbonate100g Glycerin50-100g Brightener2-5g potassium carbonate150g WaterXg Whitener W50-100g printing and dyeing adhesive200-400g WaterYg printing and dyeing adhesive200-400g 1000g 1000g3, SteamingSteaming by High temperature of saturated steam 102-105 DHS C, 15 minutes, or 130 DHS C, 8 minutes.4, Countercurrent boiling wash Reactive dyes, also known as reaction dyes, are a new type of water-soluble dyes that emerged in the 1950s. Reactive dye molecules contain active groups that can react with hydroxyl groups in cellulose fibers and amino groups in protein fibers, forming covalent bonds during dyeing to create "dye-fiber" compounds. Reactive dyes have bright colors, good leveling properties, simple dyeing methods, high dyeing fastness, a full range of color varieties, and low costs. They are mainly used for dyeing and printing on cotton, hemp, viscose, silk, wool, and their blended fabrics.Reactive dyes, also called reaction dyes, contain chemically active groups that can form covalent bonds with cotton and wool fibers in aqueous solutions. They have high wash fastness.Based on different active groups, reactive dyes can mainly be divided into two types:1. Symmetrical Triazine Type: In this type of reactive dye, the chlorine atom in the active group has relatively active chemical properties. During dyeing, the chlorine atom is replaced by the cellulose fiber in an alkaline medium and becomes a leaving group. The reaction between the dye and the cellulose fiber is a bimolecular nucleophilic substitution reaction.2. Vinyl Sulfone Type: This type of reactive dye contains vinyl sulfone groups (D-SO2CH=CH2) or beta-hydroxyethyl sulfone sulfate esters. During dyeing, the beta-hydroxyethyl sulfone sulfate ester undergoes an elimination reaction in an alkaline medium to form a vinyl sulfone group, which then reacts with the cellulose fiber through a nucleophilic addition reaction to form a covalent bond. These two types of reactive dyes are the most produced main reactive dyes in the world. To improve the fixation rate of reactive dyes, in recent years, two active groups have been introduced into the dye molecules, known as double-active dyes. Besides dyes for cellulose fibers, reactive dyes for protein fibers (such as silk and wool) have also been developed.Process:Reactive dyeing methods include padding and exhaustion dyeing. The most commonly used method for dyeing cotton with reactive dyes is exhaustion dyeing, which can be further divided into one-bath one-step, one-bath two-step, and two-bath methods. A: One-bath one-step method involves dyeing in an alkaline bath, where dyeing and fixation occur simultaneously. This method is simple, short in time, and convenient to operate, but due to simultaneous adsorption and fixation, the dye cannot diffuse after fixation, resulting in poor uniformity and penetration. B: One-bath two-step method first dyes in a neutral bath until the dye uptake approaches equilibrium, then adds an alkali agent to adjust the pH to the fixation pH (usually 11), allowing the dye to form covalent bonds with the fiber. The one-bath two-step method is a more reasonable dyeing method for reactive dyes in exhaustion dyeing, providing high dye uptake and fixation rates, as well as good uniformity, making it commonly used for cotton knitwear dyeing.Advantages:Reactive dyes, composed of parent dyes, linking groups, and active groups, form strong covalent bonds with fibers during use, offering several advantages over other cellulose fiber dyes, such as sulfur dyes and vat dyes, including: (1) Reactive dyes are one of the optimal alternatives to banned dyes and other cellulose-based dyes such as sulfur dyes, ice dyes, and vat dyes. (2) These dyes enable the attainment of high-level fastness properties-particularly wet fastness-through economical dyeing processes and simple operations. (3) Reactive dyes demonstrate broad chromatic ranges, vibrant colors, superior performance, and strong adaptability, with their color characteristics and technical specifications aligning closely with market demands for textiles and apparel. (4) They are specifically designed for dyeing and printing applications in innovative cellulose-based products like Lyocell fibers.However, the main technical challenges of reactive dyes are as follows: (1) Insufficient utilization efficiency (typically 60%-70%), resulting in substantial colored wastewater with chromaticity exceeding thousands of times and COD levels ranging from 8,000 to 30,000 ppm. Concentrated wastewater COD values surpass 50,000 ppm. (2) To suppress surface charges on fibers, reactive dyes require significant electrolyte consumption during use, which not only increases labor intensity but also causes chloride ion concentrations in wastewater to exceed 100,000 ppm, significantly complicating wastewater treatment. (3) Certain color fastness properties fail to meet market requirements, such as lightfastness to sweat, wet rubbing fastness, and the sunfastness of azo-based red and blue dyes in light shades. (4) There is limited availability of dark-colored alternatives to sulfur-based and reduction dyes.Functional Properties: Reactive dyes, composed of a parent dye, coupling group, and reactive group, form strong covalent bonds with fibers during application. This unique mechanism grants them unparalleled characteristics that cellulose-based dyes cannot match, establishing their prominence in the development and utilization of cellulose fiber dyes. These advantages are primarily reflected in four aspects: (1) Reactive dyes serve as the optimal alternative to banned dyes and other cellulose-specific dyes such as sulfur dyes, ice-dye dyes, and reduction dyes. (2) They enable high-level fastness properties-particularly wet fastness-through economical dyeing processes and simple operations. (3) Featuring a wide chromatic spectrum, vibrant colors, superior performance, and broad applicability, reactive dyes closely align with market demands for fiber and textile requirements. (4) They are suitable for dyeing and printing new cellulose-based products like Lyocell fibers. The primary approach to addressing technical challenges in reactive dyes involves enhancing their adsorption and fixation rates. The most effective method involves introducing two active groups-either different or identical-to the dye molecules, particularly the former approach: incorporating two reactive groups: chlorine and triazine, along with vinyl sulfone. These novel reactive dyes, composed of the two different active groups combined with suitable parent dyes and linking groups, not only retain the inherent advantages of each component-such as low acid hydrolysis rates, high bond stability during acidic hydrolysis, excellent washability, good fastness properties, and minimal difference between adsorption and fixation rates-they also exhibit synergistic effects. These include superior resistance to acid hydrolysis and peroxide washing, higher fixation rates, broader dyeing temperature ranges, improved color reproducibility, and suitability for medium-temperature dyeing, low-temperature dyeing, short-time dyeing, and high RFT dyeing. Consequently, these reactive dyes now account for two-thirds of all reactive dyes used in dyeing applications, making them the dominant choice for calendered and immersion dyeing processes in cotton textiles.Dyeing requires attention to the following points during use: 1. The selection of primary colors is important, considering their solubility, directness, diffusion, compatibility, sensitivity under normal dyeing conditions, fixation behavior, and washfastness, to ensure a quick balance between directness and diffusion of dyes, and a reasonable balance among directness, diffusion, fixation behavior, and washfastness. 2. When dyeing light to medium shades, especially light shades, azo red dyes and azo blue dyes have poor lightfastness, failing to meet market demands, so careful selection is needed. Using lightfastness enhancers requires experimentation; generally, using UV absorbers to improve the lightfastness of reactive dyes is not very effective. 3. When dyeing deep shades, many varieties have poor wet rubbing fastness, failing to meet market requirements, so careful use is needed. Improving the wet rubbing fastness of dyed cotton materials mainly depends on the basic dyeability of cotton, including surface structure, surface organization, smoothness, and coarseness, which are directly related to the quality of raw cotton and cotton yarn and the pretreatment of cotton fibers. 4. For market demands on the composite fastness of textiles, such as sweat-lightfastness, alkaline wet lightfastness, and alkaline wet lightfastness with peroxides, there are still some issues with these reactive dyes, requiring experimental selection. These issues are also the focus of current research and development on heterobifunctional reactive dyes.Acid dyes have a complete color range and bright colors, mainly used for dyeing and printing protein fibers such as wool and silk, and polyamide fibers. They can also be used for coloring leather, paper, cosmetics, and ink, and are occasionally used to manufacture food colorants and pigment lakes. Due to their low directness to cellulose fibers, acid dyes are generally not used for cellulose fibers.Structurally, most acid dyes are sodium salts of aromatic sulfonic acids, with azo and anthraquinone chromophores being predominant. Other chromophores include triarylmethane, oxazine, xanthene, indigo, quinoline, phthalocyanine, and nitrosoamine. Among these, azo acid dyes lead in variety and quantity, particularly monoazo and diazo types, covering yellow, orange, red, navy, and black varieties. Anthraquinone acid dyes have good lightfastness and bright colors, mainly purple, blue, and green dyes, with blue being the most important. Some anthraquinone acid dyes can enhance brightness in acid mordant dyeing. Triarylmethane acid dyes are mainly red, purple, blue, and green, generally have poor lightfastness, some bright blue varieties are not resistant to oxygen bleaching, but have very intense colors and good wet treatment fastness. Oxathioxanthene acid dyes have similar color properties and application performance to triarylmethane dyes, usually not used alone, mainly for color enhancement in acid mordant dyeing.Part of Our Customer: Company IntroductionSuzhou Trillion Shine Import & Export Co.,Ltd (Trillion Shine) is a leading Chinese supplier of dyestuff, and we also provide services for sourcing all related products of dyestuff industry from China, we have been involving in the dyestuff industry since 2003. Relying on Chinese complete industry Chain and enjoying price advantages, we provide customers with premium products, reasonable prices,and on-time services. Trillion Shine has a professional technique team who has been in this industry for more than 22 years, consists of advanced mechanics, engineers and professors. Powerful technical capabilities extend our core competence to analysis of customer's demand and provide customer with satisfying service. Trillion Shine has already established business relations with customers from South America, North America, Europe, Middle East, Southeast Asia and South Asia, obtained the customer affirmation and faith. The good faith manner,the premium quality product, the exquisite service and the customer first principle are Trillion Shine's service objective. Trillion Shine sincerely wish to establish stable business relationship with customers all over the world, please feel free to contact with us.

× More Keyword ..

× More Menu ..

×

Manufacturing & Processing Machinery

×

Industrial Equipment & Components

×

Tools & Hardware Products