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China Direct Brown Dye Suppliers - Direct Brown 2 Factory | C.I. No. 2429-82-5 Brown Powder
Product Characteristics
Direct Brown 2 is a classic di-azo direct dye, widely recognized for its warm red-brown hue and straightforward dyeing process across multiple substrates.
Physical and Chemical Properties
Solubility
Water Solubility
Direct Brown 2 has good water solubility. Its solubility in hot water is higher than that in cold water. The aqueous solution appears deep red-brown.
Organic Solvents
Direct Brown MM dissolves in ethanol and shows a light red-brown color. It is slightly soluble in acetone and insoluble in other organic solvents.
Dissolution Tip
Dissolve in 50–70℃ warm water and stir to facilitate the dyeing process.
Acid-base Stability
Alkali Resistance
Direct Brown 2 has moderate alkali resistance: stable at pH 7–10, and prone to precipitation when pH is above 11.
In Concentrated Acids & Bases
In concentrated sulfuric acid: forms a purple solution; after dilution, produces red-brown precipitate. In concentrated hydrochloric acid: dark brown solution. In concentrated caustic soda: orange-brown.
Coloring Characteristics
Color Tone
Pure red-brown (warm brown), rich in hue, with a slight red tint.
Affinity & Dyeing Rate
Strong affinity for cotton, viscose, hemp, and non-woven fabrics. Medium dyeing rate; good uniformity, average migration, sensitive to salt.
Color Fastness Indicators (Reference)
Sunlight Fastness
Grade 3
Use with caution for outdoor products
Water Wash Fastness
Grade 2–3
Dry Friction Fastness
Grade 4
Wet Friction Fastness
Grade 3
Core Advantages and Limitations
Advantages
- Unique Color Tone: Pure red light brown, warm and natural, ideal for retro and earth tone styles.
- Good Water Solubility: Cold and hot soluble, simple dyeing process, no clumping.
- Moderate Alkali Resistance: Suitable for pH ≤ 10 systems; compatible with neutral and weakly alkaline products.
- High Cost Performance: Affordable price, suitable for regular coloring and color blending.
Limitations
- Average Sun Resistance: Only Grade 3; long-term outdoor use is prone to fading.
- Weak Wash Fastness: Wet washing is prone to color loss; control dosage for high-cleanliness products.
- Poor Removability: Temperature and salt must be controlled during dyeing to avoid color bleeding.
Application Scope
Industrial Coloring
Direct Brown MM is used for paper (packaging paper, art paper), leather (shoe upper leather), water-based color paste, bamboo and wood fiber coloring.
Textile Printing & Dyeing
Direct Brown 2 is used for light brown coloring in cotton, viscose, linen and blended fabrics, suitable for blending smoky and coffee colors. Also used for silk and nylon coloring — no mordant agent required, simple process.
Usage Process
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1Mixing Dissolve in 50–70℃ warm water, stir evenly and filter before use.
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2Dosage 3–8 parts per million (0.3–0.8 g/kg); 5 parts per million is sufficient for full red light brown.
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3pH Control Maintain a stable pH of 8–10; avoid strong alkaline environments.
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4Compatibility Direct Brown MM has good compatibility with non-ionic and anionic surfactants.
Frequently Asked Questions
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QWhat is Direct Brown 2 and how is it classified?Direct Brown 2 (also known as Direct Brown MM) is a classic di-azo direct dye. It belongs to the direct dye category and is widely used for coloring cellulose-based fibers such as cotton, viscose, and hemp, as well as paper and leather substrates.
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QWhat is the best way to dissolve Direct Brown 2?The recommended method is to dissolve Direct Brown 2 in warm water at 50–70℃ while stirring continuously until fully dissolved, then filter before use. This prevents clumping and ensures a uniform dye bath. Avoid using cold water, as solubility is significantly lower at lower temperatures.
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QWhat pH range is safe for Direct Brown 2 dyeing?Direct Brown 2 is stable in the pH range of 7–10. It is suitable for neutral to weakly alkaline dyeing systems. When the pH exceeds 11 (strongly alkaline), the dye tends to precipitate and lose effectiveness. Always monitor and control pH throughout the dyeing process.
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QIs Direct Brown 2 suitable for outdoor or sunlight-exposed products?Direct Brown 2 has a sunlight fastness of only Grade 3, which means it offers limited resistance to UV exposure. It is not recommended for products that will be exposed to prolonged direct sunlight, such as outdoor textiles or signage. For such applications, consider dyes with higher light fastness ratings.
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QWhat substrates can be dyed with Direct Brown 2?Direct Brown 2 has strong affinity for cotton, viscose, hemp, non-woven fabrics, paper (packaging and art paper), leather (shoe upper leather), bamboo and wood fibers, and water-based color pastes. It can also be used for silk and nylon without the need for a mordant agent, making the process simpler.
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QHow does Direct Brown 2 perform in terms of wash fastness?The water wash fastness of Direct Brown 2 is rated at Grade 2–3, which is considered moderate. Wet washing can cause some color loss, particularly in high-cleanliness applications. To minimize bleeding, it is advisable to control the dye dosage and avoid excessive washing temperatures. For products requiring superior wash fastness, additional fixation treatments may be considered.