| HS Code | 542267 |
| Product Name | Self-emulsified Block Silicone Oil RH-NB-9903 |
| Model | RH-NB-9903 |
| Main Component | Block polysiloxane |
| Appearance | Colorless to light yellow transparent liquid |
| Ionicity | Weak cationic |
| Solid Content | 90% ± 2% |
| Ph Value | 6.0–8.0 (1% aqueous solution) |
| Viscosity | 1,000–5,000 mPa·s (25 °C) |
| Water Solubility | Soluble in water |
| Emulsifying Property | Self-emulsifying |
| Application | Softening and finishing of cotton, polyester, nylon and their blends |
| Packaging | 120 kg plastic drum or 200 kg iron drum |
| Shelf Life | 12 months in original sealed packaging |
| Storage | Store in a cool, dry, ventilated place; avoid freezing and direct sunlight |
As an accredited Self-emulsified Block Silicone Oil RH-NB-9903 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 200 kg plastic drums or 1,000 kg IBC totes, clearly labeled with product and safety information. |
| Container Loading (20′ FCL) | 20′ FCL container loading: Self-emulsified Block Silicone Oil RH-NB-9903 in sealed drums, palletized, labeled, and secured for ocean shipment. |
| Shipping | Ship Self-emulsified Block Silicone Oil RH-NB-9903 in original, sealed, labeled containers with secondary containment. Protect from freezing, heat, moisture, and direct sunlight. Confirm SDS classification before transport; unless indicated otherwise, handle as non-hazardous industrial chemical and comply with local shipping regulations. Keep containers closed and secure during loading and transit. |
| Storage | Store RH-NB-9903 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly closed and upright to prevent leakage. Protect from freezing and avoid temperatures above 35°C. Do not store with incompatible materials. Maintain original labeled containers; keep away from food, drink, and feed. Observe shelf life and use oldest stock first. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored in original, unopened containers under recommended conditions. |
In rope-form cotton knit processing, RH-NB-9903 is introduced after reactive dye fixation and soaping in atmospheric overflow jet machines operating at liquor ratios of 1:8 to 1:10. The addition point is deliberately separated from cationic dye-fixing chemistry because coacervation between residual cationic fixer and the self-emulsified silicone phase generates visible filter residue on circulation screens and uneven handle development. At production scale, the bath is cooled to 35–40 °C and pH is adjusted with dilute acetic acid to pH 5.5–6.0 before the product is injected through the dosing tank; residual alkali above pH 7.5 destabilizes the emulsion particle distribution and can cause silicone redeposition on machine walls and guide elements. The applied amount ranges from 1.5% owf for lightweight single jersey to 3.0–4.0% owf for heavy French terry requiring a compact hand, though the upper limit is usually reserved for fabrics that do not require high bulk recovery or high tensile recovery. Bath exhaustion is monitored by comparing turbidity at the start and after 15–20 min circulation; a completely clear bath is not expected because the product is deliberately hydrophilic, but a ≥80% reduction in standing milkiness is used as an in-plant control target. Relevant normative anchors are Oeko-Tex Standard 100 Annex 4 Class I, ZDHC MRSL v3.1, and REACH Regulation (EC) No 1907/2006; treated fabric is typically verified for laundering fastness under ISO 105-C06:2010 and for dimensional stability under AATCC TM135. Terminal finished goods are cotton and cotton-viscose jersey, interlock, piqué, and French terry garments for underwear, loungewear, and T-shirts. The main operational boundary is over-dosing beyond 4.0% owf, which reduces fabric tensile recovery and can create a flat, waxy handle; the product must also not be combined with strong anionic optical brighteners in the same circulation bath because charge competition precipitates the silicone at the fiber surface.
Pad trough concentration drift on cotton–polyester plain-weave finishing lines is governed by the balance between fabric wet pickup, stock replenishment, and foam generation in the pump circulation loop. When RH-NB-9903 is applied at 10–40 g/L on a vertical two-roll padder with wet pickup set between 60% and 80%, the self-emulsified product can foam if the return line discharges above the liquid surface, causing a slow increase in trough concentration because water is removed by the fabric while silicone-rich foam collapses. Plant control therefore requires a continuous level sensor and gravimetric dry-solids check of the pad bath every 30 min, supplemented by a throughput-based replenisher rather than fixed-time dosing. Drying follows at 110–130 °C in a hot-flue or stenter line; the polymer does not require curing, but the temperature profile must remain below 140 °C on white goods to avoid thermal yellowing. The industry compliance set includes Oeko-Tex Standard 100 Annex 4, ZDHC MRSL v3.1, and, for organic certification pathways, GOTS v7.0 chemical input criteria; mechanical claims are anchored to ASTM D5034-21 grab breaking strength, AATCC TM79 absorbency, and ISO 105-X12 rubbing fastness. Finished articles are printed or dyed woven sheeting, shirting, and lightweight home textile fabrics. The dosage upper boundary is 40 g/L; above this level, the treated fabric may show altered seam slippage behavior and a hand that is difficult to reverse without rewashing.
Rotary spray lines in leather finishing departments operate with aqueous basecoats and tie coats where a soft, dry handle is required without the oiliness associated with mineral oil emulsions. In such systems, RH-NB-9903 is post-added to the finish mix after pigment dispersion at 0.5–2.0 wt% of the ready-to-use formulation, equivalent to 1.0–3.0% on dry resin solids for polyurethane-acrylic basecoat systems. The product is added under slow propeller agitation below 300 rpm to limit foam; subsequent application is carried out by rotary spray or HVLP spray equipment with fluid pressure set to 0.3–0.8 bar and atomization air between 1.0–2.5 bar, followed by drying in a tunnel at 80–90 °C for 2–5 min per coat. The relevant compliance anchors are ZDHC MRSL v3.1, REACH Regulation (EC) No 1907/2006, and Oeko-Tex Leather Standard; finish adhesion is assessed by ISO 11644:2009, and color fastness to rubbing by ISO 11640:2018. The critical process boundary is the upper dose in the color coat: values above 2.0 wt% of ready-to-use formulation reduce finish adhesion to the grain and may create a soft, elastic film that is difficult to plate under stacking conditions. The product is not recommended for direct addition to solventborne top coats and should be tested when used with high-absorbency corrected grain leather because preferential penetration into the grain fissure can produce localized darkening. Terminal finished goods include automotive upholstery, shoe upper leather, and fashion leather goods.
| Application track | Core normative reference | Control parameter | Process boundary |
|---|---|---|---|
| Cotton knit exhaust softening | Oeko-Tex Standard 100 Annex 4 Class I; ZDHC MRSL v3.1 | Bath pH, turbidity reduction | pH 5.5–6.0; 35–40 °C |
| Woven pad–dry finishing | Oeko-Tex Standard 100 Annex 4; ASTM D5034-21 | Pad trough dry solids | 10–40 g/L; 110–130 °C |
| Leather aqueous finish | ISO 11644:2009; ZDHC MRSL v3.1 | Finish adhesion | 0.5–2.0 wt% ready-to-use |
| Waterborne coating | ASTM D523-14; EU Ecolabel 2014/312/EU | Mar resistance, gloss retention | 0.10–0.50% total formula |
| Rinse-off hair conditioner | Regulation (EC) No 1223/2009; ISO 11930 | Stability, viscosity | 0.5–2.0 wt%; below 40 °C |
Waterborne acrylic and acrylic-urethane topcoats use RH-NB-9903 as a slip and mar additive when the formulation requires lower coefficient of friction without solventborne wax dispersions. Dosage in this compartment is set at 0.10–0.50% by total formula weight, or 0.30–1.0% on binder solids for high-gloss clearcoats and direct-to-metal topcoats. The addition point is post-letdown, after pigment dispersion has been completed and the letdown resin has been incorporated, because introduction before the grind phase can stabilize microfoam and interfere with pigment wetting and dispersant equilibrium. Plant addition is performed under a Cowles disperser at 500–800 rpm, with batch temperature maintained between 30–40 °C; higher shear or extended mixing above 40 °C can reduce the particle size distribution and change surface migration behavior. Normative anchors include EU Ecolabel 2014/312/EU for indoor paints and coatings, ASTM D4060-19 for Taber abrasion resistance, ASTM D523-14 for specular gloss, ASTM D4366-16 for pendulum damping hardness development, and ISO 2813:2014 for gloss measurement of high-build films. The central process conflict is the balance between surface slip and film hardness development: above 0.5% on total formula weight, high-gloss direct-to-metal topcoats may exhibit retarded hardness development and intercoat adhesion loss that must be checked under ASTM D4366-16 and ASTM D3359-17. The product is not intended for solventborne alkyd systems without prior compatibility testing. Terminal finished products are waterborne wood coatings, metal furniture topcoats, and industrial plastic coatings.
Cold-process hair conditioner manufacturing imposes a dosage ceiling because polyether block silicones remain compatible with cationic conditioner emulsifiers only within a narrow phase ratio and temperature window. RH-NB-9903 is added at 0.5–2.0 wt% in rinse-off conditioners and at 0.1–0.5 wt% in low-viscosity shampoo or co-wash formulations where light conditioning without build-up is required. The addition point is the final phase, below 40 °C, under sweep agitation after the viscosity builder has fully hydrated; pH is adjusted with citric acid to 4.0–6.0 before silicone addition to reduce hydrolysis risk and emulsion instability. Cosmetic compliance is anchored to Regulation (EC) No 1223/2009; the INCI designation is product-specific and must be confirmed against the supplier safety data sheet, while preservation is validated under ISO 11930. The critical boundary is the concentrated anionic surfactant premix: direct combination with sodium laureth sulfate or ammonium lauryl sulfate at high active matter can destabilize the silicone phase and produce viscosity collapse. Finished product types are rinse-off conditioners, leave-on detangling sprays, heat-protectant creams, and sulfate-free co-wash products. Stability screening at 45 °C for 12 weeks and 3 freeze-thaw cycles is required before release, and addition above 2.0 wt% in cationic lamellar-gel systems may cause a measurable drop in yield stress and storage-phase separation.
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Self-emulsified Block Silicone Oil RH-NB-9903 is supplied as a water-dispersible siloxane-polyalkylene oxide block copolymer fluid intended for aqueous finishing and surface-modification processes. The product model RH-NB-9903 does not require an external emulsifier for dilution into deionized water at ambient temperature; the block silicone structure provides water compatibility sufficient to form a translucent to semi-translucent aqueous dispersion. The material is evaluated in continuous pad-mangle textile finishing, exhaust processing of knitted cotton and polyester/cotton blends, and technical textile finishing where shear-stable silicone deposition and low-foam behavior are required. Published product-specific technical data for RH-NB-9903 is limited. The following paragraphs therefore identify class-level behavior for self-emulsifying block silicone fluids and indicate where RH-NB-9903-specific certificate values are required.
Specification control for RH-NB-9903 should begin with the supplier certificate of analysis. For block silicone fluids of this designation, the batch certificate commonly covers appearance, non-volatile content, pH of a 1 wt% aqueous dispersion, and dynamic viscosity at 25 °C measured under ISO 3104:2023 or ASTM D445-21. Typical viscosity readings for similar nonionic block silicone fluids fall between 500 mPa·s and 3000 mPa·s at 25 °C, but the exact RH-NB-9903 specification cannot be assumed from class data. Non-volatile content is generally reported above 90 % by mass; again, the product-specific value must be taken from the approved batch certificate. Ionic character is typically nonionic or weakly cationic depending on block terminal groups, which influences compatibility with optical brighteners, resin finishes, and cationic auxiliaries.
The distinction relevant to RH-NB-9903 is not the absence of silicone deposition but the mechanism of emulsification. Conventional amino-functional polydimethylsiloxane fluids are usually delivered as milky macroemulsions stabilized by surfactant monolayers at the oil-water interface. Those surfactant lamellae can be displaced by shear, salt, or co-dosed finishing chemicals. In a siloxane-polyalkylene oxide block copolymer, the hydrophilic polyether block is covalently linked to the silicone block. Dilution in water therefore produces a thermodynamically constrained dispersion rather than a surfactant-stabilized macroemulsion. This does not make the dispersion immune to instability, but it removes the surfactant-lamella failure route observed in pad troughs with high-velocity recirculation.
| Parameter | Conventional amino macroemulsion | Self-emulsified block silicone RH-NB-9903 class |
|---|---|---|
| External emulsifier requirement | Usually required; often 5–15 wt% relative to silicone oil | Not required for dilution; block copolymer is water-dispersible |
| Diluted appearance at 1 wt% | Milky-white macroemulsion; turbidity commonly above 200 NTU | Translucent to bluish microemulsion; turbidity often below 100 NTU under ISO 7027-1:2016 |
| Shear stability in high-speed pad trough | May cream or coalesce under high turbulence | Retains dispersion under high turbulence; no added surfactant to desorb |
| Hydrophilicity after cure | Often reduces absorbency unless topped with hydrophilic agent | Block architecture can retain measurable absorbency; tested by AATCC TM79-2018 or ISO 9073-13:2007 |
| Yellowing tendency | Amino groups may contribute to heat yellowing | Reduced but not eliminated; whiteness index should be verified by ISO 105-J01 |
The comparison in Table 1 is class-level and should not be interpreted as a direct RH-NB-9903 product data sheet. Where a specific application performance claim is required, the exact grade should be tested under the intended bath pH, water hardness, co-additive load, and cure profile. The absence of external emulsifier is significant because it reduces the number of formulation variables that can drift between batches. However, the covalent polyether block introduces temperature-dependent water solubility behavior that must be controlled at the mixing station.
For RH-NB-9903, viscosity should be logged at the point of use after conditioning the sample at 25 °C for at least 2 h in a closed container. Dilution protocols specified in producer literature for block silicone fluids typically recommend adding the silicone to water under moderate agitation at 300–600 rpm, not water to silicone, to avoid transient high-concentration gel zones. A 1 wt% stock dispersion in deionized water should be inspected for stability after 24 h. An increase in nephelometric turbidity above the initial value by more than 10 NTU indicates ionic interference, incomplete dispersion, or water-quality interaction. Turbidity is measured under ISO 7027-1:2016, and dynamic viscosity under ISO 3104:2023. Because RH-NB-9903 is self-emulsifying, the diluted working bath is usually below 10 mPa·s at 25 °C, which is compatible with low-pressure pad trough circulation pumps. This value depends on water hardness and co-dosed lubricants, and should be confirmed on the production line rather than assumed from a laboratory sample.
Water quality influences the equilibrium between a translucent microemulsion and an aggregated dispersion. At total hardness above 250 mg/L CaCO₃, nonionic block silicone fluids may show salt-induced cloudiness without immediate loss of deposition. The working bath should be checked for filter-blocking potential using a 10 µm inline filter differential pressure alarm set at 0.5 bar. If the differential pressure rises by more than 0.2 bar within 30 min, the dispersion is not suitable for direct injection into the pad trough. Published data for RH-NB-9903 in high-hardness process water is limited; laboratory minipad validation under plant water conditions is required before bulk use.
Residual sodium hydroxide or potassium carbonate from upstream scouring, bleaching, or mercerizing can raise the finishing bath pH above 9.0. In this range, siloxane-polyalkylene oxide block copolymers may undergo slow hydrolysis of the siloxane backbone if held for more than 4–6 h at temperatures above 40 °C. Production experience on continuous knit finishing ranges indicates that trough pH should be held between 5.0 and 8.0. pH values above 9.0 should be corrected with dilute acetic acid before RH-NB-9903 addition, not after, because localized acid contact can split the dispersion. Bath turnover is a more practical control than pH correction alone: a residence time below 60 min at 35–45 °C limits alkaline hydrolysis. These limits are class-level operating boundaries; RH-NB-9903-specific stability data under strong alkali are limited and should be validated in a laboratory minipad prior to bulk use.
If the incoming fabric carries peroxide residues from bleaching, the bath may also contain residual oxidant. Peroxide concentrations above 50 mg/L can degrade the polyether block and cause the dispersion to become hazy and filterable. Catalase treatment should be completed before the finishing bath, and the residual peroxide should be measured by titration or test strip before any silicone addition. The same caution applies to hypochlorite residues, which are more aggressive to the polyether segment. A water rinse after peroxide neutralization reduces the carryover of decomposed salts and improves bath stability.
Pad mangle application of RH-NB-9903 is typically conducted with a two-bowl or three-bowl horizontal pad, roller hardness 65–75 Shore A, and linear contact pressure between 20 N/mm and 40 N/mm. Wet pickup on cotton knit may be adjusted to 65–80 % by mass; the objective is to avoid expression tails that produce center-to-selvedge unevenness. The compound is added to the trough at 5–30 g/L depending on the target hand and fabric construction. Above 30 g/L, the wet pickup may fall because of increased bath viscosity, and roller slippage may develop quickly. Drying should be staged to avoid skinning: 110–130 °C for the first zone followed by 150–170 °C for 60–90 s cure. Without staged drying, the outer fabric surface can form a film that traps water and produces nonuniform silicone migration.
Bath temperature in the trough should be monitored at the point of entry and at the return line. A temperature difference greater than 5 °C between the two points creates a viscosity gradient that can alter pad expression and cause edge-to-center variation. If cooling coils or jacketed troughs are used, the set point should be 25–35 °C. Above 40 °C, the polyether block may approach its cloud point in some formulations, producing a sudden turbidity increase and possible roller deposit. Because the cloud point of RH-NB-9903 is not stated in public technical data, a cloud-point check should be performed on the working bath at plant concentration before the first production lot.
Bath incompatibility is most frequently observed when anionic fluorescent whitening agents or strong cationic softeners are co-dosed with RH-NB-9903. Because the product’s dispersibility depends on the block polyether domains, anionic additives can complex with weakly cationic sites and collapse the microemulsion, producing a filterable precipitate that appears as greasy specks on the fabric surface. Cationic additives may not immediately precipitate but can increase deposition on pad rollers and create slime in low-flow zones. A screening test is required: mix 1 wt% RH-NB-9903 and the intended co-additive concentration in process water at 30 °C for 30 min, then pass through a 500 µm screen and measure the residue after drying at 105 °C. A residue above 0.05 g/L indicates a compatibility risk. Use ISO 105-J01 whiteness index to evaluate yellowing; do not infer yellowing resistance from visual appearance alone.
Resin finishes based on dimethyloldihydroxyethyleneurea or low-formaldehyde glyoxal resins may also shift the bath pH and ionic strength. The addition sequence matters: the resin should be diluted first, the bath pH adjusted to the catalyst range, and then RH-NB-9903 added under agitation. If the product is added before pH adjustment and then acid catalyst is introduced, the silicone may aggregate because of rapid pH drop. The working bath should be checked for viscosity and turbidity immediately after final addition and again after 10 min. An increase in viscosity greater than 5 % suggests incipient instability.
Machine fouling is not exclusively chemical. On a three-bowl pad mangle, silicone build-up is often initiated by bath starvation at the trough edges and by air entrainment in the return line. A recirculation rate of 1.5–2.0 times bath volume per minute is sufficient to maintain concentration, but return flow should be discharged below the liquid surface to prevent vortexing. The use of defoaming agents is generally unnecessary with RH-NB-9903 at working dilutions; if foam control is required, non-silicone defoamers are preferred because silicone antifoam droplets may compete with the block silicone for fiber deposition. After the shift, lines should be rinsed with 0.5 % sodium carbonate solution at 40 °C to remove acidic residue, followed by clean water. The use of strong caustic or solvent-based cleaners on seals and rollers should follow the equipment manufacturer’s elastomer compatibility table.
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