Super Soft and Smooth Silicone Oil RH-NB-9902

Which exhaust and pad-batch parameters govern silicone oil deposition on cellulosic knits without high-temperature yellowing?

In exhaust application on 100% cotton single jersey and cotton/elastane interlock, RH-NB-9902 is introduced as an aqueous silicone oil emulsion after reactive dye neutralization and final rinse but before extraction. The dosing window of 0.5–1.5% owf is maintained because below 0.3% owf handle improvement is barely detectable in ring pull-through and above 2.0% owf hydrophilicity loss and seam slippage risk increase. Exhaust bath pH is held at 5.0–6.0 with acetic acid; pH below 4.5 destabilizes the emulsion in the presence of residual anionic dye molecules, while pH above 7.0 reduces substantivity to cellulose. Liquor ratio is kept between 1:8 and 1:12, bath temperature 40–50°C, and running time 20–25 min in overflow-dyeing machines. For pad-mangle lines, the pad trough concentration is 10–30 g/L and wet pick-up is 65–80%; drying at 110–130°C and curing at 150–170°C for 60–90 s on a stenter frame with 6–8 zones is standard. Side-centre-side pick-up variation is observed on fabric widths above 200 cm when stenter speed exceeds 40 m/min. Compliance for infant textile articles is evaluated under OEKO-TEX Standard 100 Annex 4 Class I, with additional scrutiny of cyclic siloxane residues under ZDHC MRSL v3.1 and restricted substances under REACH Annex XVII. Phenolic yellowing potential is assessed with ISO 105-X18:2007, and shade change after finishing with ISO 105-C10:2006. Terminal products include single-jersey T-shirts, piqué polo fabric, interlock sleepwear, cotton/elastane leggings, and infant bodysuits where surface pH is adjusted to 5.5–6.5 before cut-and-sew.

Chrome-free nappa garment leather topcoat formulations containing RH-NB-9902 are adjusted on pneumatic spray lines to maintain film coalescence and plate-release behaviour during hot pressing. The addition ratio in a waterborne polyurethane topcoat is held between 2.0% and 5.0% by dry resin mass; in solvent-borne polyurethane/butyl acetate topcoats, the range narrows to 1.5–3.5% because high solvent diffusion can carry silicone to the surface before crosslinking. Spray application uses HVLP guns with 1.2–1.4 mm nozzle sets, atomisation pressure 3.0–3.5 bar, gun distance 25–30 cm, and spray viscosity 18–22 s Ford Cup No.4 at 25°C. The finish is dried in an IR and convection tunnel at 70–80°C for 5–8 min, then hot plated at 90–100°C and 80–100 bar. A production bottleneck occurs when topcoat is applied over an incompletely coalesced water-based basecoat; trapped moisture creates micro-bubbles at the interface and silicone migration appears during plate pressing. In-process moisture content of the basecoat should therefore be verified below 12–14% by handheld dielectric measurement. Compliance is documented to ISO 11644:2022 for finish adhesion, ISO 11640:2018 for wet and dry rub fastness, ISO 17233:2017 for cold crack resistance, and REACH Annex XVII Entry 43 for azocolourants in dyed leather. Finished goods are lambskin nappa jackets, capeskin gloves, aniline and semi-aniline upholstery hides, and chrome-free shoe upper leather.

Wet-Process Polyurethane Synthetic Leather Basestock and Surface Slip Modification

RH-NB-9902 is incorporated into DMF or DMAC-based polyurethane coating solution for wet-process synthetic leather basestock at 1.0–3.0 wt% of resin solids; for the transfer-coated surface skin layer, addition is held to 0.5–2.0 wt% of the skin resin solids. Cumulative silicone addition should not exceed 3.0 wt% of total resin solids, because phase separation between siloxane domains and the PU hard-segment network reduces interlayer adhesion. The coating line runs a knife-over-roll coater with a gap of 0.4–1.2 mm onto release paper, followed by wet coagulation in a DMF/water bath at 25–30°C for 8–15 min. DMF extraction and washing are carried out in counterflow tanks at 60–70°C, then the web enters a curing tunnel at 120–140°C for 3–5 min. After release paper stripping, embossing is performed at 120–130°C. On lines with inline corona treatment, surface energy is targeted above 38 mN/m before print or lamination; without corona, the slip additive can lower surface energy enough to cause ink pinholing on water-based print stations. Compliance is linked to REACH Annex XVII restrictions for DMF in consumer articles, ZDHC MRSL v3.1 for dimethylformamide and cyclic siloxane residues, ISO 105-B02:2014 for light fastness, and DIN EN 71-3 migration limits when synthetic leather is used in toys. Terminal articles include automotive seat bolsters, microfibre synthetic leather for footwear uppers, handbag panels, and upholstery laminate for office furniture.

When Silicone Oil Is Used as an Internal Lubricant in High-Consistency Silicone Rubber Compounding

In high-consistency silicone rubber based on vinyl-functional polydimethylsiloxane and fumed silica, RH-NB-9902 is used as an internal process aid at 0.3–1.5 phr. The additive is introduced on a two-roll mill with a friction ratio of 1.2:1 to 1.4:1 after silica has been fully incorporated, and the mill is maintained at 20–50°C to prevent prematuration of the peroxide or platinum catalyst. Increasing the addition from 0.3 phr to 1.5 phr typically reduces compound Mooney viscosity and improves mill release, but tensile strength and tear resistance may decline at levels above 2.0 phr, especially in compounds with Shore A hardness below 40. Press cure is conducted at 170–180°C for 10–15 min at 150–200 kg/cm², followed by post-curing in a hot-air oven at 200°C for 4 h to remove volatile siloxane oligomers. Compliance for repeated food-contact articles is assessed under FDA 21 CFR 177.2600 and DIN EN 12875-1:2005 for dishwasher resistance; for medical-grade tubing, compendial testing according to USP <87> and USP <88> may apply but must be conducted on the finished sterilized device. Terminal products are extruded silicone gaskets, peroxide-cured seals, platinum-cured tubing, and compression-molded diaphragms where surface tack must be minimised without transferring to polycarbonate mating parts.

Polypropylene/ethylene-octene TPO compounds for injection-molded door panel skins are dry-blended with RH-NB-9902 before twin-screw compounding to reduce low-load scratch visibility and mould release force. The additive is metered at 0.5–2.0 wt% of compound mass; levels below 0.3 wt% provide limited improvement in surface slip, while levels above 2.5 wt% can reduce melt strength and create splay during filling of thin-wall ribs. Compounding is performed on a co-rotating twin-screw extruder with L/D 48:1, barrel temperatures 200–230°C, screw speed 400–600 rpm, and vacuum devolatilization at -0.08 MPa in the final barrel zone. Injection molding uses clamp force 800–1,600 t for large door panels, melt temperature 210–230°C, injection pressure 70–120 MPa, and mould surface temperature 30–60°C. The low-surface-energy additive can reduce paint adhesion, so flame or atmospheric plasma treatment is specified before painting or adhesive bonding in assembled interior modules. Compliance for cockpit materials is based on VDA 278:2011 for VOC and FOG emissions and DIN 75201:2011 for fogging reflectance; REACH Annex XVII applies where restricted phthalates are present in the compound. Finished part types include lower dashboard trim, door panel skins, glovebox covers, and centre console side covers.

Fiber-to-Fiber Friction Control in High-Loft Nonwoven Carding Lines

RH-NB-9902 is applied as a diluted silicone emulsion to polyester staple fibre during opening and blending for high-loft nonwoven batting. The active add-on on fibre is controlled to 0.2–0.8 wt%; the neat emulsion is diluted to 5–10% solids and sprayed through air-atomising nozzles in the fine-opener stage or metered through a kiss roll in the card feed. At add-on above 1.0 wt%, fibre-to-fibre cohesion drops to the point that web drafting becomes unstable, and carding speeds on roller-top cards with cylinder diameters of 1.0–1.5 m are typically limited to 60–120 m/min. Drying after application is run at 65–85°C for 5–10 min in a perforated-drum dryer to prevent migration of the finish to the batt surface. Compliance for consumer textile articles is verified under OEKO-TEX Standard 100 Annex 4 Class I or Class II, REACH Annex XVII, and GB 18401-2010 for formaldehyde and extractable heavy metals in domestic use. Terminal products are polyester high-loft batting for mattress pillow tops, down-alternative duvets, outdoor insulated jackets, and moulded automotive acoustic insulation where low fibre-metal friction reduces needle punch burr breakage.