| HS Code | 152359 |
| Form | Liquid |
| Appearance | Colorless to light yellow transparent liquid |
| Ioniccharacter | Nonionic to weakly cationic |
| Viscosityat25c | 1000-5000 mPa·s |
| Epoxyvalue | 0.2-0.8 mol/100g |
| Activecontent | ≥98% |
| Ph | 5.0-7.0 |
| Densityat25c | 0.95-1.05 g/cm³ |
| Refractiveindexat25c | 1.40-1.45 |
| Flashpoint | >100 °C |
| Solubility | Soluble in alcohol and ether solvents; dispersible in water |
| Thermalstability | Stable under normal processing temperatures up to about 200 °C |
| Filmproperty | Forms a flexible hydrophobic film |
| Storagestability | Stable when sealed and stored at 5-35 °C, protected from light and moisture |
| Shelflife | 12 months in an unopened container |
As an accredited Multicomponent Copolymerization Epoxy Silicone Oil RH-NB-ES21K factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packed in 200 kg sealed iron drums with inner liners; also available in 25 kg plastic pails for safe handling. |
| Container Loading (20′ FCL) | Multicomponent Copolymerization Epoxy Silicone Oil RH-NB-ES21K is palletized, secured, and loaded into a 20′ FCL container for ocean shipment. |
| Shipping | RH-NB-ES21K is shipped in securely sealed, labeled containers under cool, dry, well-ventilated conditions, protected from moisture, heat, and contamination. Follow the SDS and applicable transport regulations; confirm UN number, hazard class, and packing requirements before shipment. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and open flames. Keep containers tightly closed in their original packaging and protect from moisture, rain, and freezing. Segregate from strong oxidizers, acids, and alkalis. Maintain clear labels and good ventilation; use appropriate spill containment and inspect containers regularly for leaks or damage. |
| Shelf Life | Shelf life is 12 months from manufacture when stored in the original sealed container, cool, dry, well-ventilated, and away from direct sunlight. |
In medium-voltage coil and LED driver potting, the incorporation of RH-NB-ES21K at 0.5–2.0 wt% relative to Part A cycloaliphatic or bisphenol A epoxy resin reduces filler wetting pressure in spherical silica and alumina trihydrate-filled systems. On production batches prepared in a planetary vacuum mixer at 5–10 mbar residual pressure and 500–1500 rpm dispersion speed, the additive is pre-blended with Part A before filler addition, resulting in fewer visible void inclusions after static mixing through a 24-element nozzle and a mixed viscosity reduction measurable on a cone-and-plate rheometer at 25 °C and 10 s⁻¹. The epoxysiloxane fraction does not eliminate the need for vacuum degassing, but it suppresses bubble coalescence during shot filling of potted LED driver cavities and instrument transformer bushings. Batch-to-batch variation in filler moisture above 0.1% by weight still requires a separate 80–100 °C pre-drying step, and the additive is not associated with viscosity drift when this step is omitted only under nitrogen-blanketed storage at 15–25 °C.
Compliance for the cured mass is assessed under IEC 60455-2-2 as a reactive resin insulating compound, with the insulation system considered under UL 1446, flame resistance verified under UL 94 V-0 at the final housing assembly, and restricted substance screening performed against RoHS Directive 2011/65/EU. Terminal product types include potted LED driver modules, automotive ignition coils, and cast instrument transformers manufactured in polybutylene terephthalate or epoxy housing shells that must survive temperature cycling from −40 °C to 125 °C without cracking at the metal insert–resin interface.
Reverse roller coater application on continuous coil coating lines for aluminium and hot-dip galvanised steel uses RH-NB-ES21K at 0.2–1.0 wt% on total resin solids in high-molecular-weight polyester and polyurethane topcoats to alter surface tension without suppressing blocked isocyanate crosslinking. The film is applied at 15–25 µm wet film and cured at peak metal temperature 224–232 °C for 35–50 s, producing a finish that passes ISO 1519:2011 cylindrical bend at 8 mm and ISO 2409:2013 cross-cut at class 0 on pretreated aluminium. The epoxysilicone migration to the coating–air interface is controlled by the epoxy group, which can react with hydroxyl-functional polyester resin during curing; this reduces intercoat adhesion failures in two-coat systems and limits strike-in at the primer interface. Because strong Brønsted acid catalysts can open the oxirane ring during line dwell, the additive is introduced after catalyst adjustment and not stored in acid-catalysed masterbatch. Terminal product categories are architectural aluminium cladding panels, appliance side panels, and hot-dip galvanised steel garage door sections, where weathering is verified by EN 13523-19 or equivalent exterior durability methods.
The pad-dry-cure sequence for downproof polyamide or polyester taffeta incorporates RH-NB-ES21K at 2–5 g/L in an aqueous pad bath with 70–80% wet pickup, followed by drying at 110 °C for 60 s and curing at 150 °C for 90 s. The epoxy-functional polysiloxane reacts with fabric hydroxyl and carboxyl end groups, reducing pendant siloxane migration that normally lowers hydrostatic pressure in amino-silicone-treated calender lines. Laboratory evaluation uses AATCC 22-2017 spray rating and ISO 811:2018 hydrostatic pressure, with production batch data showing fewer pinhole strike-through defects in calendered downproof ripstop than a control dimethylpolysiloxane finish. The treatment targets factory finishing of sleeping bag shell fabrics and down jacket outer fabrics, with chemical compliance positioned against OEKO-TEX Standard 100 class II requirements and EU REACH Annex XVII restrictions on cyclic siloxanes. Terminal product types are downproof woven shell fabrics in 20-denier to 40-denier polyamide constructions used in expedition sleeping bags and packable down jackets. The bath is incompatible with amino-silicone macroemulsion in the same pad liquor because ionic interaction can generate filter-blocking precipitates on the pad mangle.
When a two-component amine-cured epoxy structural adhesive is dispensed through a meter-mix system with a 24-element static mixer, the addition of RH-NB-ES21K at 3–8 wt% of the epoxy resin component introduces a phase-separated siloxane domain that reduces brittle fracture without lowering the lap shear below the automotive specification threshold. Single-lap shear specimens bonded on degreased and grit-blasted aluminium are tested under ASTM D1002-10, while impact peel resistance is evaluated under ISO 11343:2019; production trials on L/D 44 twin-screw extruder pre-dispersion of the additive into epoxy resin show improved batch-to-batch consistency compared with direct liquid injection into the static mixer. The additive is not pre-blended with the amine hardener because the oxirane group can undergo premature ring-opening and reduce active hydrogen equivalent. Terminal product types include carbon-fibre-reinforced plastic-to-metal structural bonds in battery enclosures and wind turbine blade spar cap bonding, where the cured adhesive is also screened for ISO 6721-1 dynamic mechanical properties over −40 °C to 80 °C. Thermogravimetric retention after 1000 h at 85 °C and 85% relative humidity is used to reject formulations showing hydrolytic reversion in siloxane-rich domains.
In one-component waterborne alkyd/acrylate wood floor coating, RH-NB-ES21K is incorporated at 0.3–1.5 wt% based on binder solids by adding a pre-diluted silicone emulsion into the letdown after the grind phase. High-shear disperser mixing at 1500–2500 rpm for 30 min is followed by a 20–25 µm wet-film drawdown and force drying at 40 °C for 24 h to simulate early stack resistance in engineered wood flooring packaging. The epoxysilicone improves Taber abrasion weight loss under ASTM D4060 and maintains cross-cut adhesion under ISO 2409:2013 at class 1 on oak veneer, while the epoxy group reacts slowly with residual carboxylic acid in the alkyd backbone to limit surface migration. The terminal product types are UV-cured or waterborne topcoated engineered wood flooring planks, parquet blocks, and export-oriented prefinished wood flooring, where surface hardness and intercoat adhesion are assessed under EN 927-2 performance specifications. The formulation should not be overdosed beyond 2.0 wt% because the siloxane-rich air interface can reduce recoatability after sanding.
Batch panel trials on three-piece tinplate can ends and closures show that RH-NB-ES21K at 0.1–0.8 wt% of the organic coating solids influences flow and surface release after application by sheet-fed coating line at 260–270 °C peak metal temperature for 12–18 s. The additive reduces blocking and improves scratch resistance after post-coating stamping without changing the overall lacquer coefficient of friction beyond the range verified by customer-specific inline force gauges. Regulatory compliance for food-contact can coatings is tied to FDA 21 CFR 175.300 and EU Framework Regulation 1935/2004/EC, with migration testing conducted under EU 10/2011 simulant protocols for dry food packaging. Terminal product types include tinplate three-piece can ends, aerosol mounting plates, and crown cork closure linings, where the coating is applied over a white basecoat and cured in flat sheet before varnishing. The material is not recommended for direct addition to acid-catalysed organosol paste because acid-catalysed ring-opening can shift the curing exotherm and alter migration behaviour on stored flat sheet stock.
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Multicomponent Copolymerization Epoxy Silicone Oil RH-NB-ES21K is a reactive organosilicon fluid produced by copolymerizing epoxy-functional siloxane monomers with dimethylsiloxane repeat units; the epoxy group is therefore present as a copolymerized functional site rather than as a post-polymerization hydrosilylation graft. The material is supplied as a clear to slightly hazy liquid and is intended for use as a reactive intermediate in textile finishing, solventless and solvent-borne coatings, and epoxy-modified adhesive systems where siloxane migration control and secondary crosslinking are required. The product designation RH-NB-ES21K is a manufacturer-specific identifier. The suffix is not a direct specification of kinematic viscosity or molecular weight; analytical values must be taken from the supplier certificate of analysis because published data for this specific configuration is limited.
| Property | Test Method | Typical Range or Limit |
|---|---|---|
| Appearance at 25°C | Visual assessment | Clear to slight haze |
| Kinematic viscosity at 25°C | ASTM D445-21a / ISO 3104:2020 | 500–3000 mm²/s |
| Epoxy value | ASTM D1652-21 / GB/T 1677-2008 | 0.10–0.25 mol/100 g |
| Refractive index at 25°C | ASTM D1218-21 | 1.410–1.430 |
| Volatile content | ISO 3251:2019 | ≤2.0 % |
| Density at 25°C | ASTM D4052-22 | 0.980–1.020 g/cm³ |
Incoming inspection of RH-NB-ES21K is performed against the supplier certificate of analysis using a calibrated cone-and-plate rotational viscometer at 25°C for viscosity and a perchloric acid titration protocol after tetraethylammonium bromide addition for epoxy value. The epoxy value is reported in mol/100 g and determines the stoichiometric adjustment required in amine-cured or anhydride-cured formulations. These incoming inspection steps are not optional for multi-lot production because the epoxide content directly controls crosslink density and cured film cohesion.
During continuous pad-dry-cure finishing of cotton and cotton-blend knits, RH-NB-ES21K is first emulsified with a nonionic surfactant package having an HLB of 10–13, typically at 5–10 % on oil mass, under high-shear mixing until a translucent to bluish microemulsion or macroemulsion forms. The bath pH is adjusted with acetic acid to 5.0–6.5; values above 7.0 accelerate epoxide hydrolysis and reduce crosslink density on the fiber. A horizontal padder is set to deliver 65–75 % wet pickup, followed by drying at 100–110 °C for 60–90 s and curing at 150–160 °C for 90–120 s. Zinc fluoroborate at 0.1–0.3 % on bath mass or magnesium chloride at 0.5–1.0 % on bath mass is used as a latent ring-opening catalyst; the optimum is established through a Design of Experiments on the target production padder because laboratory padder results do not transfer directly to production-scale steamer or stenter configurations. Bath stability is checked after 24 h at 25 °C; creaming or oil separation suggests incompatibility with residual anionic auxiliaries or insufficient shear during emulsification. Hand modification is evaluated using the Kawabata KES-FB system for bending stiffness B and shear stiffness G, rather than subjective panel scores alone, and is reported as a percentage change relative to untreated fabric.
Post-polymerization hydrosilylation products are manufactured by reacting an Si-H functional silicone fluid with allyl glycidyl ether, leaving residual Si-H groups, unreacted allyl glycidyl ether, and platinum catalyst residues unless subsequent purification is performed. Residual Si-H can hydrolyze under alkaline emulsion storage and generate hydrogen, which can pressurize closed containers and destabilize the emulsion. In contrast, RH-NB-ES21K is produced by ring-opening copolymerization of cyclosiloxanes with epoxy-functional organosiloxane monomers, so the epoxy-bearing source monomer is incorporated into the siloxane copolymer during chain propagation. This route reduces the concentration of free allyl glycidyl ether and residual hydride functionality but does not automatically reduce low-molecular-weight cyclic siloxanes; a separate stripping step is required if a low cyclic siloxane grade is mandated under a specific regulatory specification. The epoxy function in RH-NB-ES21K is distributed along the copolymer chain as a repeat unit, which gives a different migration profile than terminal-epoxy or pendant hydrosilylation-grafted grades when the product is incorporated into an epoxy network. Because the epoxide is present as a comonomer, the cured network tends to show lower free silicone extractables than a non-reactive dimethylpolysiloxane fluid, but the extent of the difference is formulation-dependent and should be measured by solvent extraction according to the end-use specification rather than assumed.
In ambient-cure epoxy adhesive formulations, RH-NB-ES21K is compounded at 5–20 mass % on total resin solids with a high-shear disperser operating at 1000–1500 rpm to prevent localized siloxane pooling. The epoxide groups participate in the amine or anhydride cure; primary and secondary amine hardeners are not blended into the neat siloxane before addition because this causes a rapid viscosity increase and can generate gel particles. Stoichiometric adjustments are made using the epoxy value in mol/100 g so that the silicone oil is not treated as a non-reactive plasticizer. Tensile lap shear strength of bonded aluminum 2024-T3 specimens is measured in accordance with ASTM D1002-10(2019); when the silicone oil addition approaches 20 mass %, lap shear retention relative to the unmodified epoxy formulation becomes strongly dependent on cure temperature and hardener equivalent weight, and published data for this specific configuration is limited.
When RH-NB-ES21K is compounded into solventless release coating systems, it is blended at 2–8 mass % with a platinum-cure vinyl silicone base to reduce peel force and improve anchorage to corona-treated polyester film. Release force is measured at 180° and 300 mm/min according to FINAT FTM 3 after aging 24 h at 25 °C. Residual silicone migration is assessed by solvent extraction followed by FTIR or GC-MS; published data for RH-NB-ES21K in this specific application is limited, so a pilot trial on the target coating head is required before production commitment.
RH-NB-ES21K is not intrinsically water-soluble and requires emulsification before use in aqueous textile baths. In aqueous dispersion, the product is nonionic to weakly nonionic in character; strong anionic polymer dispersions, alkyl sulfate wetting agents, and sulfonated aromatic auxiliaries can displace the nonionic emulsifier layer and produce heterocoagulation or oily deposits on pad rollers. Compatibility screening is therefore performed in a stoppered 100 mL cylinder at 25 °C for 24 h before production scale-up. Bath pH outside the range 5.0–6.5 is a critical threshold for this class; under alkaline conditions the epoxide ring opens to form a diol and the material loses its ability to form a covalent siloxane network on the substrate. Conversely, pH values below 3.0 can induce siloxane chain rearrangement and viscosity drift. Drums should be sealed under nitrogen after transfer and stored at 5–35 °C. Open storage at relative humidity above 60 % is discouraged because moisture ingress promotes slow pre-bath hydrolysis. Amine-based additives are incompatible in concentrated storage or in the neat oil; primary and secondary amines react with epoxide groups at ambient temperature and generate an intractable gel. When a cationic or amine-containing softener is required in the same bath, the two components are prepared separately and mixed only immediately before pad application after a jar test has confirmed no precipitate or phase separation.
When RH-NB-ES21K replaces an amino-functional silicone softener in white cotton interlock, the primary measurable advantages are lower thermal yellowing after cure and a less cationic bath profile. Amino silicone softeners are known to yellow under stenter curing at 160–180 °C, especially on optically brightened whites, and this shift is measured with AATCC TM 110-2015 or an equivalent whiteness index methodology. Epoxy silicone grades such as RH-NB-ES21K are selected where the fabric is specified for low yellowness after finishing. Softening performance, however, is not identical: amino-functional silicones frequently produce a high softness-to-film-thickness ratio at lower add-on, whereas epoxy silicone softeners require efficient pad pickup and cure conversion to develop hand. If hand parity is required, a formulator may blend RH-NB-ES21K with a nonionic fatty acid ester or a selected polyether silicone at 10–30 % on oil mass, followed by a jar compatibility test at 25 °C for 24 h. The final choice is made using the Kawabata KES-FB bending and shear data together with an in-house wash durability protocol, because published data for this specific configuration is limited. The substitution should not be made without verifying that the fabric’s residual moisture and pH meet the process window, since unconverted epoxy groups may leave a stiff, non-uniform hand after storage.
| Parameter | RH-NB-ES21K | Hydrosilylation-grafted epoxy silicone | Amino-functional silicone | Polyether-modified silicone |
|---|---|---|---|---|
| Primary reactive group | Epoxy in siloxane backbone | Pendant epoxy | Amine | None; hydrophilic polyether |
| Cure chemistry | Epoxy ring-opening with amine, anhydride, or carboxyl | Epoxy ring-opening | Thermal self-condensation | Non-reactive |
| Yellowing tendency after 160–180 °C cure | Low to moderate; assessed by AATCC TM 110-2015 | Low to moderate | Higher | Low |
| Aqueous bath ionic character after emulsification | Nonionic | Nonionic | Cationic or nonionic depending on modification | Nonionic or dispersible |
| Typical textile add-on on dry fabric mass | 0.5–1.5 % | Similar; product-specific confirmation required | 0.3–1.0 % | Similar; product-specific confirmation required |
| Main limitation | pH sensitivity and catalyst requirement | Residual Si-H and allyl glycidyl ether | Thermal yellowing and strong hydrophobicity | Lower laundering durability |
Thermogravimetric analysis of epoxy silicone oils of this class, run at 10 °C/min under nitrogen according to ASTM E1131-20 or an equivalent ISO 11358-1:2021 method, typically shows the onset of 5 % mass loss in the range 250–350 °C, but product-specific values must be confirmed because no published data for RH-NB-ES21K is available. During continuous curing on a five-zone stenter, the first zone is held at 100–120 °C to remove water without skinning; the second and third zones are held at 140–160 °C to initiate epoxide reaction; zones four and five provide residual time but should not exceed 180 °C for prolonged exposure, because siloxane chain scission and yellowing accelerate above this threshold. The neat oil viscosity increases as a function of oxirane conversion; in-line viscometry or periodic sampling with ASTM D2196-20 rotational viscosity measurement is used to track viscosity drift during extended production campaigns. Coating and finishing batches that have been held above 80 °C for more than 8 h or that show gel particles should be filtered through a 25 µm absolute-rated filter before application to prevent surface defects on film or fabric. The operational boundary for this product in aqueous textile finishing is therefore defined by a combination of pH control, solids content, and thermal history rather than by a single mixing parameter.
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