| HS Code | 182468 |
| Productname | Neutral Phosphorus-free Soaping Agent RH-NB-2253 |
| Producttype | Neutral phosphorus-free soaping agent |
| Appearance | Colorless to light yellow transparent liquid |
| Ionicnature | Nonionic/anionic |
| Phvalue | 6.0-8.0 |
| Watersolubility | Easily soluble in water |
| Solidcontent | ≥40% |
| Phosphoruscontent | 0% |
| Neutrality | Neutral |
| Stability | Stable under normal storage conditions |
| Application | Soaping and washing after reactive dyeing |
| Packaging | 125 kg plastic drum |
| Shelflife | 12 months |
As an accredited Neutral Phosphorus-free Soaping Agent RH-NB-2253 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | RH-NB-2253 is supplied in 125 kg plastic drums or 1,000 kg IBC totes, suitable for industrial handling. |
| Container Loading (20′ FCL) | 20′ FCL container loading: Neutral Phosphorus-free Soaping Agent RH-NB-2253 packed in sealed drums, palletized, secured, and labeled for safe transport. |
| Shipping | Neutral Phosphorus-free Soaping Agent RH-NB-2253 is typically shipped in sealed plastic drums or IBC containers with regulation-compliant labels. Handle as a general industrial chemical unless the SDS states otherwise; keep containers closed, protect from extreme temperatures, and prevent leakage during transport. |
| Storage | Store Neutral Phosphorus-free Soaping Agent RH-NB-2253 in its original, tightly closed container in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and incompatible materials. Protect from freezing and extreme temperatures. Keep separate from food, feed, and drinking water. Follow label instructions, observe shelf life, and use stock first-in, first-out. |
| Shelf Life | RH-NB-2253 typically has a 12-month shelf life when stored sealed in a cool, dry, well-ventilated place away from direct sunlight. |
On a continuous open-width washing range processing pad–dry–pad–steam reactive-dyed cotton poplin at 40–80 m/min, the transition from alkaline fixation to soaping is controlled by a two-stage counterflow box arrangement. In the first soaping compartment, RH-NB-2253 is metered at 1.5–2.5 g/L, and the second compartment is maintained at 0.5–1.5 g/L through counterflow from the second box to the first. Box temperatures are held at 85–95 °C with a residence time of 10–20 s per compartment; drop-tank conductivity and pH sensors trigger replenishment when pH exceeds 7.5. The absence of phosphate builders prevents calcium phosphate scale on guide rollers, which is a documented failure mode on hard-water lines when conventional phosphate-based soaping agents are used. Hydrolysed reactive dye extracted during this step is removed from the counterflow before it can redeposit onto selvedge folds; final whiteness of cotton ground is evaluated by AATCC 61-2013 accelerated laundering followed by spectrophotometric assessment of multifibre staining. Compliance for this cold-to-hot washing sequence is normally benchmarked against ZDHC MRSL v3.1 and OEKO-TEX ECO PASSPORT criteria; alkylphenol ethoxylate absence is verified by ISO 18254-1:2016. The downstream output is woven shirting, twill workwear, and sateen sheeting.
Soft-flow dyeing machines processing single jersey or interlock with 5–12% elastane require lower soaping temperature than pure cotton to protect elastane tenacity; the bath is kept at 90–95 °C rather than 98 °C. RH-NB-2253 is added at 1.0–2.0 g/L after a cold rinse and a neutralisation step using acetic acid to pH 6.5–7.5. The liquor ratio is typically 1:8–1:12, and the soaping cycle lasts 12–20 min, with a second identical bath where deeply saturated shades require lower residual hydrolysed dye. High-turbulence nozzle pressure of 0.5–1.2 bar and fabric speed of 200–350 m/min increase mechanical removal of unfixed reactive dye; without a low-foaming neutral dispersant, foam collapses pump suction and causes rope tangling. The neutral pH of the soaping bath reduces hydrolytic attack on the vinyl-sulphone dye–cellulose bond in the presence of residual cationic fixatives used on adjacent batches. Wash fastness for these knit goods is assessed by ISO 105-C06:2010 A1S using cotton and nylon multifibre; the measured staining and change in colour are referenced to buyer-specific minimum grades. The phosphate-free composition also supports effluent compliance in dyehouses operating under ZDHC wastewater guidelines. The processed fabrics are converted into underwear, T-shirts, leggings, and infant apparel where Oeko-Tex Standard 100 Class I controls are applied.
After a 12–16 h cold pad batch fixation at 25–30 °C for reactive-dyed cotton twill bottomweights, the residual alkali and silicates present in the batching liquor are substantially higher than in continuous pad-steam operation. The batched roll is unrolled on an open-width range, and a dedicated acid neutralisation bath with acetic acid at 0.5–1.0 g/L precedes the first soaping section; this prevents the neutral soaping agent from being exhausted by mineral alkalinity before it can disperse hydrolysed dye. In the soaping boxes, RH-NB-2253 is charged at 2.0–4.0 g/L, because the unfixed dye load after long batching can be materially higher depending on dye depth and fixation conditions. Temperatures of 90–95 °C and extended residence of 20–35 s per box are used, with mechanical counter-roller squeezing and counterflow water movement. Phosphate-free operation avoids magnesium ammonium phosphate precipitates that can accumulate on padder rolls when high-hardness water carries magnesium and calcium into the wash train. The end products are chinos, cotton canvas workwear, and heavy twill bottomweights; the fabric is subsequently dried and tested according to ISO 105-C06:2010 C1S, with particular attention to edge-to-centre shade uniformity after roll storage.
Vertical package dyeing machines handling cotton yarn on perforated cones or cheeses must manage differential pressure across the yarn column to prevent unlevel soaping. In this configuration, RH-NB-2253 is applied at 1.0–2.5 g/L in a two-bath sequence after the reactive dyeing cycle; each soaping bath is held at 90–95 °C for 15–25 min. Package density is normally controlled at 350–400 g/L, and the main pump is reversed every 2–4 min to equalise inside-to-outside flow. Neutral soaping reduces the risk of alkaline hydrolysis of the dye–fibre bond in high-density package centres where flow is limited and trapped alkali is difficult to rinse. Foam formation is a critical parameter because foam pockets in the package column cause channeling and cross-shade variance; the agent is dosed through a side tank with slow addition over 5–7 min to avoid pump cavitation. After soaping, the yarn is hot rinsed at 70–80 °C and neutralised to pH 6.0–7.0. The dyed yarn is wound onto knitters’ packages or warp beams and converted into jersey knit, socks, and sweater bodies. Because producer-published data for this exact high-density package configuration with the product is limited, a laboratory-scale package unit should be used to validate differential pressure at the intended liquor ratio before bulk runs.
| Configuration | Machine type | Liquor ratio or fabric speed | RH-NB-2253 dosage | Soaping temperature | Critical control point |
|---|---|---|---|---|---|
| Continuous pad-steam woven shirting | Open-width wash range | 40–80 m/min | 1.5–2.5 g/L first box; 0.5–1.5 g/L second box | 85–95 °C | pH ≤ 7.5; counterflow conductivity |
| Exhaust cotton–elastane knit | Soft-flow jet | 1:8–1:12 | 1.0–2.0 g/L | 90–95 °C | Nozzle pressure 0.5–1.2 bar; foam collapse |
| Cold pad batch cotton bottomweights | Open-width range after batching | 20–35 s residence per box | 2.0–4.0 g/L | 90–95 °C | Residual alkali before soaping; pH 6.5–7.5 |
| Package yarn | Vertical package dye machine | Package density 350–400 g/L | 1.0–2.5 g/L | 90–95 °C | Differential pressure; pump reversal 2–4 min |
| Digital inkjet printed fabric | Continuous washing line | 30–60 s residence per compartment | 1.0–2.0 g/L | 60–80 °C first; 80–90 °C second | Thickener film swelling; ground staining |
| Garment dyeing | Rotary drum | 1:20–1:30 | 1.0–2.5 g/L | 80–90 °C | Drum speed 15–20 rpm; metal trim compatibility |
When reactive dye inks on pretreated cotton or viscose are fixed with saturated steam at 101–103 °C for 10–12 min, the subsequent washing sequence must remove high concentrations of unfixed ink from the residual alginate or synthetic thickener film without staining unprinted ground areas. RH-NB-2253 is metered into the first hot soaping compartment of a continuous inkjet washing line at 1.0–2.0 g/L and held at 60–80 °C; this lower temperature prevents premature swelling of the thickener film that would trap hydrolysed dye. The second soaping compartment is run at 80–90 °C with the same dosage, followed by cold overflow rinses. Because printable fabric often carries an acid-donor or alkaline pretreatment that is sensitive to high pH, neutral soaping avoids disturbing the pretreatment chemistry of unprinted areas, which reduces ground yellowing and staining. The extracted hydrolysed reactive dye is removed by counterflow and filtered through a 50–100 µm drum filter before entering the drainage manifold. Compliance for printed textile auxiliaries is typically assessed under OEKO-TEX ECO PASSPORT and GOTS 7.0; APEO absence is confirmed by ISO 18254-1:2016. End products are printed cotton lawn for sample yardage, viscose soft signage, and cotton-rich home textiles with high white-ground contrast.
Garment dyeing in rotary drum machines introduces a different mechanical shear regime than fabric dyeing, and the soaping stage must remove hydrolysed reactive dye from seams, rib cuffs, and textile labels without damaging metal buttons, zipper tapes, or elastane neck tapes. RH-NB-2253 is dosed at 1.0–2.5 g/L after the reactive dyeing bath is dropped and the load is cold-rinsed; the soaping bath is heated to 80–90 °C and held for 15–20 min, with drum rotation set to 15–20 rpm depending on machine diameter. Liquor ratio in garment drums is typically 1:20–1:30, which increases the amount of unfixed dye released into the bath; a second soaping bath is required for dark shades such as black, navy, and deep burgundy. The neutral pH of the bath protects polyurethane elastane from alkaline degradation and reduces the risk of colour bleeding from dyed-to-match polyester sewing threads. Phosphate-free operation also simplifies effluent management in small-batch garment dyehouses that discharge to municipal treatment systems. Wet and dry crocking grades are evaluated using ISO 105-X12:2016, and accelerated laundering uses AATCC 61-2013 1A for hand-wash programs. The outputs are garment-dyed T-shirts, sweatshirts, hoodies, and casual dresses with a characteristically washed appearance.
| Control point | Reference standard or framework | Measured parameter | Application area |
|---|---|---|---|
| Phosphate and APEO restriction | ZDHC MRSL v3.1 | Phosphate content; alkylphenol ethoxylates | All downstream |
| Textile process chemical certification | OEKO-TEX ECO PASSPORT | APEO by ISO 18254-1:2016 | All downstream |
| Organic textile auxiliaries | GOTS 7.0 | Banned phosphate and nonylphenol ethoxylate | Organic cotton goods |
| Domestic and commercial laundering | ISO 105-C06:2010 | Multifibre stain and shade change | All dyed fabrics |
| Accelerated laundering | AATCC 61-2013 | 2A or 1A depending end-use | Garments and knits |
| Colour fastness to rubbing | ISO 105-X12:2016 | Dry and wet crocking | Garment dyeing |
Lyocell and modal knits acquire surface fibrillation and wet abrasion damage when processed in high-turbulence jet machines under alkaline conditions; soaping after reactive dyeing is therefore carried out at 80–90 °C with a dosage of 0.5–1.5 g/L. The lower temperature and neutral pH minimise fibre swelling and mechanical bruising while still removing hydrolysed monofunctional and bifunctional reactive dye. In a soft-flow jet with low nozzle pressure 0.3–0.6 bar and fabric speed 150–250 m/min, the bath is drained after dyeing, cold-rinsed twice, and then soaped for 10–15 min. A single soaping bath is generally sufficient for light and medium shades; heavy black or navy shades require a second bath at 0.5–1.0 g/L. Because regenerated cellulosic fibres have lower wet tenacity than cotton, the agent’s low-foaming character is more critical here: foam bubbles collapse into the fabric rope and create shock-loading on fibre surfaces. The end products are modal leggings, lyocell blouses, and regenerated cellulosic underwear. Colour fastness and fibre damage are evaluated by ISO 105-C06:2010 and microscopic fibre evaluation after 5 launderings.
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Neutral Phosphorus-free Soaping Agent RH-NB-2253 is a water-dilutable textile auxiliary formulated for the post-dyeing wash-off of unfixed and hydrolyzed reactive dye from cellulosic substrates. The model designation RH-NB-2253 identifies a neutral-buffered, phosphorus-free product within the manufacturer’s soaping-agent portfolio, supplied as a low-viscosity liquid for exhaust and continuous washing systems. Total phosphorus in the concentrate is typically below the reporting threshold of 0.1 mg/L as measured by inductively coupled plasma optical emission spectrometry after acid digestion in accordance with ISO 11885. The product is dosed at 0.5–3.0 g/L in wash baths where residual alkali from reactive dye fixation may still be present, and it does not require separate addition of acetic acid for pH neutralization when feed-water alkalinity is within typical surface-water ranges. Published plant-specific data for this exact designation are limited, so the following discussion relies on standard test methods and machine-class behavior rather than proprietary production results.
In exhaust applications on overflow dyeing machines with liquor ratios from 1:5 to 1:12, RH-NB-2253 is introduced after the fixation bath has been drained and the substrate has received at least one cold overflow rinse. The first soaping bath is maintained at 80–95 °C for 10–20 min, followed by a warm rinse at 50–60 °C. Hydrolyzed reactive dye removal is monitored by measuring the absorbance at the λmax of the dyestuff in the final rinse, with complete clearance defined as an absorbance value indistinguishable from blank rinse water. On air-jet machines, low-foam behavior is evaluated by the Ross–Miles method according to ISO 696:1981; foam height at 50 °C should remain below 50 mm at the recommended concentration to avoid pump cavitation and fabric lift loss.
The liquid formulation is specified by appearance, pH of a 1% aqueous solution, density at 20 °C, kinematic viscosity at 25 °C, and water miscibility. pH is measured with a calibrated glass electrode according to ISO 10523:2008 and is maintained within 6.0–8.0 for most production lots. Density measured by oscillating U-tube according to ISO 15212-1:1998 is normally between 1.00 g/cm³ and 1.10 g/cm³. Kinematic viscosity measured by capillary viscometer according to ISO 3104 is typically below 500 mm²/s at 25 °C, which permits direct metering by piston or peristaltic dosing pumps without pre-dilution. Storage stability is evaluated in sealed polyethylene containers at 5–35 °C; under these conditions the product remains homogeneous for at least 12 months. Freeze-thaw exposure below 0 °C can produce reversible turbidity or gel formation, and the concentrate should be restored to 20–25 °C under low-shear mixing before withdrawal. Prolonged storage above 40 °C is not recommended because oxidative degradation of the nonionic surfactant fraction may shift pH by more than 0.3 pH units and reduce dispersing efficiency.
The product can be diluted with water at ambient temperature; however, hard water containing more than 300 mg/L CaCO₃ should be pre-softened before concentrate dilution, because high hardness may reduce the cloud point of the nonionic component and cause wax-like separation on dosing lines. The diluted working solution exhibits shear-thinning behavior under high turbulence; viscosity recovery is rapid after passage through the jet nozzle, which minimizes localized deposition on guide rollers and heat-exchanger surfaces.
| Parameter | Test method | Typical specification |
|---|---|---|
| Appearance at 25 °C | Visual transmission | Clear to slightly hazy liquid |
| pH at 1% aqueous solution | ISO 10523:2008 | 6.0–8.0 |
| Density at 20 °C | ISO 15212-1:1998 | 1.00–1.10 g/cm³ |
| Kinematic viscosity at 25 °C | ISO 3104 | Below 500 mm²/s |
| Total phosphorus | ISO 11885 | Below 0.1 mg/L |
| APEO | EN ISO 18254-1:2016 | Not detectable at 20 mg/kg |
Alkaline soaping agents are traditionally used because high pH conditions swell cellulosic fiber and ionize residual carboxyl groups, promoting electrostatic repulsion between the substrate and sulfonated hydrolyzed dye. However, a neutral pH of 6.0–7.5 is sufficient for desorption when the soaping agent provides a polymeric dispersing component that adsorbs onto the dye molecule and suppresses redeposition. The rate-limiting step in wash-off is not simple dye solubility but transfer of hydrolyzed dye from the fiber surface boundary layer into the bulk bath. The boundary layer is governed by flow velocity, temperature, and the osmotic gradient created by the dispersant. In mercerized cotton, pore diameter and surface charge density differ from unmercerized cotton, but a near-neutral wash bath reduces alkali-induced fiber damage and avoids the need for subsequent acid neutralization. Published kinetic data for RH-NB-2253 specifically are limited; comparative studies of neutral polymeric soaping agents on reactive-dyed cotton show that equivalent final wash fastness to ISO 105-C10:2006 can be obtained when the soaping temperature is increased by 5–10 °C relative to a strongly alkaline control.
Suppression of redeposition is evaluated by adding hydrolyzed dye to the soaping bath at 2% on the weight of fabric and measuring the resulting CIE L* and chroma of white adjacent fabric according to ISO 105-C10:2006. The evaluation is conducted on multipurpose adjacent multifibre fabric. A neutral soaping agent with effective dispersing power yields a staining grade of 4–5 or better on cotton and polyester adjacent strips, even in the presence of 5 g/L sodium sulfate. This performance is relevant because the first soaping bath in exhaust dyeing may contain residual salt concentrations from the fixation stage.
In combination with bifunctional reactive dyes containing vinyl sulfone and monochlorotriazine groups, the neutral pH profile of RH-NB-2253 reduces the risk of alkali-catalyzed cleavage of the dye–fiber bond during prolonged soaping. This is particularly important for turquoise and phthalocyanine chromophores, which are sensitive to over-washing in alkaline baths at high temperature. The product is compatible with acid-liberating finishing agents used after washing, provided the final rinse pH is controlled. It is not recommended for use in alkaline reduction clearing of disperse dye on polyester or in one-bath scouring/bleaching operations, because the required pH and redox conditions exceed the designed pH buffer capacity of the formulation.
At liquor ratios above 1:15, the concentration of hydrolyzed dye in the soaping bath is often diluted, but dye redeposition onto white or contrasting areas of the textile can still occur through hydrophobic interaction between dye aggregates and the fiber surface. This is observed in garment dyeing machines and winch vessels with low mechanical interchange. The dispersing component of RH-NB-2253 maintains hydrolyzed dye in the aqueous phase; its effectiveness can be quantified by a redeposition index derived from the reflectance decrease on nylon, polyester, and cotton undyed fabric after a blank soaping cycle containing 0.01 g/L hydrolyzed dye. A redeposition index above 0.8 reflectance units is considered unacceptable in this evaluation; the product is designed to maintain redeposition below this threshold at the recommended dose. Machine configuration can change this value, and published data for this specific configuration is limited.
High liquor ratios also reduce mechanical shear, so the product’s low-foam character becomes less critical. Conversely, package dyeing machines with high liquor velocities and pump ratings above 2.0 bar differential pressure can generate foam from residual surfactants. The Ross–Miles foam volume of RH-NB-2253 at recommended concentration is specified by comparison to a defoamed reference; a foam height below 50 mm at 50 °C after 5 min is the typical acceptance value, preventing pump air-binding and uneven liquor circulation through the yarn package.
| Characteristic | RH-NB-2253 | Alkaline phosphorus-containing reference |
|---|---|---|
| pH at 1% aqueous solution | 6.0–8.0 | 10.0–12.0 |
| Total phosphorus | Below 0.1 mg/L by ISO 11885 | Usually 1.0–5.0% w/w as phosphonate/phosphate |
| Foam height at 50 °C | Below 50 mm by ISO 696:1981 | Often 80–150 mm |
| Required neutralization after dyeing | Not required for standard reactive cotton | Required before or after soaping to control pH |
| Risk of phosphate scale on package dyeing heat exchangers | Absent phosphorus-related scale | Present at water hardness above 150 mg/L CaCO₃ |
The comparison is based on standardized test conditions: a package of 1.0 kg bleached cotton yarn dyed with 3% o.w.f. C.I. Reactive Black 5, fixed with sodium silicate/sodium hydroxide, and washed in a laboratory package dyeing machine with a liquor ratio of 1:10. The rate of temperature increase to the soaping stage is 2 °C/min, soaping time is 20 min, and rinse water is softened to 50 mg/L CaCO₃. After the complete wash-off sequence, color fastness to washing is tested according to ISO 105-C10:2006. In these standardized conditions, RH-NB-2253 produces adjacent-fabric staining grades equal to or better than the alkaline reference, with lower total phosphorus discharge in the combined wash effluent.
Because dyehouse effluent phosphorus limits in many regions are below 1.0 mg/L total phosphorus for direct discharge or below 0.5 mg/L for sensitive receiving waters, replacement of phosphated soaping agents is a practical compliance measure. RH-NB-2253 is formulated to fall below the analytical reporting limit for phosphorus, but actual effluent phosphorus load also depends on the dyestuff, salt, and process auxiliaries. The contribution of the soaping agent to chemical oxygen demand is similar to that of other surfactant-based wash-off agents; wastewater treatment operators should measure COD according to ISO 6060:1989 and dissolved organic carbon according to ISO 8245:1999 during full-scale trials.
Under the EU Ecolabel criteria for textile products, the absence of phosphorus-containing builders does not automatically guarantee ecolabel compliance. APEO, chlorophenols, and specific amine residues are controlled separately; the formulation should be accompanied by a supplier declaration confirming compliance with REACH Annex XVII and the ZDHC MRSL. For textile auxiliary chemicals, screening for nonylphenol ethoxylates is carried out by EN ISO 18254-1:2016 or equivalent solvent extraction and LC-MS/MS detection; reporting limits are commonly 20 mg/kg. RH-NB-2253 should be required to show non-detectable APEO at that limit.
Residual sodium sulfate or sodium chloride from reactive dyeing can reduce the cloud point of nonionic surfactants and cause phase separation in the soaping bath if the product is nonionic. RH-NB-2253 is designed to tolerate electrolyte concentrations up to 20 g/L sodium sulfate at 85 °C; above this level, the first soaping bath should be diluted or drained earlier. Cloud-point depression is evaluated by heating a 1% product solution in synthetic hard water containing 5 g/L sodium sulfate and observing clarity; the acceptance criterion is no visible turbidity below 90 °C. If turbidity occurs, higher water flow or shorter exchange interval is required. High salt content also increases the density difference between the wash bath and the package, requiring pump curves to be adjusted; the product does not alter liquor viscosity sufficiently to affect pump power at the recommended dosage.
For pad-steam and continuous open-width washing, the product is introduced in the first and second compartments at 1.0–3.0 g/L. The wash-box temperature is held at 85–95 °C, and countercurrent water flow is set at 2–4 L/kg of fabric. The final cold rinse contains 0.2–0.5 g/L of product to prevent redeposition of dye from the rinse water. The washing effect is judged by extractable dye remaining in a boiling 25% dimethylformamide/water mixture; the extraction is measured spectrophotometrically at the dye’s λmax. This method is not standardized, so plant correlation with fastness tests is required.
RH-NB-2253 is not intended for reactive dyebath scouring in strong alkali, vat dye soaping with hydrosulfite, or reduction clearing of disperse dyes with sodium dithionite. Under reducing conditions, sulfur-containing reducing agents can interact with the polymeric dispersant and produce sulfurous by-product odors. It is also not recommended for use with cationic aftertreatment agents in the same bath, because anionic/nonionic components can form complexes that lower the aftertreatment fixation level. If a cationic fixing agent is required, the substrate should be rinsed completely and the bath changed before aftertreatment.
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