Direct Brown 227

Direct Brown 227 is a water-soluble direct dye primarily formulated for cellulose substrates (cotton, viscose, paper). It delivers a warm brown shade with good substantivity, easy application in exhaust and pad dyeing processes, and is commonly used in textile, paper and printing applications where economical, level brown shades are required.

TRADE NAME:Direct Yellow Brown N-D3G,Direct Fast Catechine GNB

Key features

• Fiber affinity: high substantivity for cellulosic fibers (cotton, rayon); limited affinity for nylon and acrylic without mordants.
• Application methods: suitable for exhaust dyeing, pad dyeing, continuous/thermosol processes and pigment-like printing pastes.
• Leveling: good inherent leveling — provides uniform shade on knitted and woven goods with proper auxiliaries.
• Fastness profile: generally moderate washfastness and lightfastness; improves with after-treatments and crosslinking agents.
• Compatibility: compatible with common direct-dye auxiliaries (salt, leveling agents, carriers); avoid strong reducing agents.
• Typical processing window: performs well in neutral to slightly alkaline liquor; exhaustion accelerated by salt and gentle heating.
• Dose & shade build: economical — suitable for lighter goods at low %OWF and for deeper shades with incremental dosing.
• End-uses: apparel, home textiles, industrial fabric and paper coloration where stable brown tones are needed.
• Storage & handling: store dry in a cool, ventilated area; avoid moisture to preserve flow and dispersibility.

Application:

Direct Brown 227 Apply to the cellulose fiber dyeing and printing.

Technical Specifications

• ‍CAS NO: 76930-14-8
• Molecular Formula: C32H24N9NaO7S
• Molecular Weight: 701.65
• Shade: Brown.‍

FAQ

Which dyeing method gives the most level shade?

Exhaust dyeing at a controlled temperature rise with appropriate salt and a non-ionic leveling agent typically yields the most uniform shade. For knit fabrics, shorter liquor ratios and gradual heating help avoid streaking; for woven goods, pad-batch can be used but requires careful pad pick-up control and a subsequent leveling/standoff step.

What are typical processing recommendations (pH, temperature, auxiliaries)?

Typical dyeing is carried out in neutral to slightly alkaline liquor. Temperature profiles vary by process — many users see consistent performance at 80–100°C in exhaust dyeing; pad dyeing/continuous processes follow standard fixation profiles. Sodium chloride or sodium sulfate may be used to promote exhaustion; avoid strong reducing environments that will reduce the dye chromophore.

Can Direct Brown 227 be used for printing?

Yes — it can be formulated into direct-dye printing pastes for cotton and paper. For printing, control paste viscosity, apply a uniform drying/fixation schedule, and include after-wash and fixation steps to remove unfixed dye. For high-fastness prints, consider a post-fixation resin or combined pigment printing approach.

How should I store and handle this dye safely?

Store the powder in sealed, moisture-resistant containers in a cool, dry, well-ventilated area away from strong oxidizers or reducers. Use standard PPE (gloves, dust mask) when handling powders. For regulatory and MSDS specifics, consult the supplier’s safety data sheet before scale use.

What small-scale lab checks should I run before production?

Conduct a 1–2 kg lab run to verify shade build (dose vs. %OWF), exhaustion curve (time/temperature), leveling on actual fabric constructions, and fastness tests (wash, rub, light). Also test compatibility with your washing and finishing chemistries — small differences in auxiliaries can change fastness and hand feel.