| HS Code | 392374 |
| Productname | Multicomponent Copolymerization Epoxy Silicone Oil RH-NB-ES12K |
| Chemicaltype | Epoxy-modified multifunctional silicone copolymer |
| Appearance | Colorless to light yellow transparent liquid |
| Ionicity | Nonionic to weak cationic |
| Activecontent | Approximately 100% |
| Viscosityat25c | Typically 1,000-5,000 mPa·s |
| Epoxyvalue | Supplier-specific; typically 0.2-0.8 mmol/g |
| Densityat25c | Approximately 0.95-1.05 g/cm³ |
| Refractiveindexat25c | Approximately 1.40-1.45 |
| Ph | Approximately 6-8 |
| Solubility | Soluble in common organic solvents; water dispersibility depends on formulation |
| Storagestability | Stable under sealed, dry, cool conditions |
| Shelflife | Typically 12 months in unopened container |
| Flashpoint | Typically greater than 100 °C |
| Volatilecontent | Low; supplier-specific |
As an accredited Multicomponent Copolymerization Epoxy Silicone Oil RH-NB-ES12K factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packed in 200 kg drums, RH-NB-ES12K multicomponent copolymerization epoxy silicone oil is supplied in sealed, labeled industrial containers. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with drums of Multicomponent Copolymerization Epoxy Silicone Oil RH-NB-ES12K, securely stowed, lashed, and sealed for shipment. |
| Shipping | RH-NB-ES12K is supplied in sealed, labeled steel drums or IBC totes. Ship via authorized chemical carriers according to local/national regulations. Keep containers closed, upright, and protected from heat, moisture, and freezing. Consult the SDS for transport classification, packaging requirements, and emergency handling. |
| Storage | Store RH-NB-ES12K in its original, tightly closed container in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and open flames. Protect from moisture and freezing, and keep separate from oxidizers, acids, and alkalis. Maintain clear labeling, prevent leaks, and follow local regulations and SDS requirements. |
| Shelf Life | Typically, RH-NB-ES12K has a 12-month shelf life when stored sealed in a cool, dry, ventilated place away from sunlight. |
In high-voltage power module encapsulation, copper leadframes expand at approximately 17 ppm/K while the surrounding epoxy mould compound is held at 10–12 ppm/K; the interlayer between die attach, leadframe and encapsulant therefore requires a reduced-modulus network with high thermal-shock tolerance. RH-NB-ES12K is incorporated into an anhydride-cured diglycidyl ether system at 20–45 phr on resin solids, with methyl hexahydrophthalic anhydride as hardener and 1-methylimidazole accelerator at 0.1–0.3 phr. The liquid components are mixed in a planetary vacuum mixer with wall scraper at 60 rpm planetary and 800 rpm disperser for 12–18 min, then degassed at 5 mbar until residual dissolved air falls below 100 ppm. Gel time at 120 °C is recorded on a hot-plate stroke cure instrument according to ISO 10364:2018. The glass transition temperature is measured by differential scanning calorimetry under ASTM D3418-21 using the second heating ramp at 10 K/min, and the coefficient of linear thermal expansion is determined by thermomechanical analysis under ISO 11359-2:2021 from -40 °C to 180 °C. Thermal-shock screening is performed in an air-to-air chamber following MIL-STD-883 Method 1010.7 condition B with 15 min dwell and transfer time below 10 s. Tensile elongation of cured plaques is tested under ISO 527-2 at 50 mm/min. Published data for this exact multicomponent copolymer composition is limited; above 45 phr, hot-stage polarised light microscopy is required to rule out phase separation, and a silane coupling agent pre-treatment at 0.5–1.0 wt% of total formulation may be needed to maintain dispersed droplet diameter below 200 nm.
| Property | Test method | Equipment | Measurement condition |
|---|---|---|---|
| Glass transition temperature | ASTM D3418-21 | DSC | second heating, 10 K/min |
| Coefficient of linear thermal expansion | ISO 11359-2:2021 | TMA | -40 °C to 180 °C |
| Thermal shock resistance | MIL-STD-883 Method 1010.7 | air-to-air thermal shock chamber | condition B, 15 min dwell |
| Tensile elongation | ISO 527-2 | universal tester, type 1BA | 50 mm/min |
| Mixed viscosity | ISO 3219 | cone-plate rheometer | 25 °C, shear rate 10 s⁻¹ |
In UV-cationic release coating, line speed is constrained by photoinitiator acid diffusion rate, residual moisture content of the paper or film substrate, and the concentration of unreacted siloxane at the cured surface. RH-NB-ES12K is charged at 1.5–3.0 wt% of total solids into a cycloaliphatic epoxide matrix containing a triarylsulfonium hexafluoroantimonate photoinitiator at 0.5–2.0 phr. The coating is applied on a five-roll coater with reverse doctor blade gap of 5–10 µm and dried at 80–100 °C before the UV station. Cure is obtained with a mercury vapour lamp at 120 W/cm and a belt speed of 20–40 m/min, delivering 80–150 mJ/cm² UV dose. Release force is measured on a tensile tester fitted with a 180° peel jig at 300 mm/min after a 24 h dwell on TESA 7475 tape according to FINAT FTM 3; subsequent adhesive anchorage is checked according to FINAT FTM 1. Because the epoxy groups are co-cured into the network, extractable siloxane fractions are lower than with non-reactive dimethylsiloxane oils, but undercured edges at high line speed can still produce migration; extractables are confirmed by solvent extraction and GC-MS screening for food-contact liners under FDA 21 CFR 176.170. The substrate must be pre-dried to below 0.5% equilibrium moisture when relative humidity exceeds 60%, otherwise cationic cure is inhibited and release force increases above the target window. This additive should not be combined with amine-functional slip agents or alkaline fillers because premature oxirane opening destroys pot life.
Steel fabrications in ISO 12944-2 C4 and C5 corrosivity categories require topcoats that maintain scribe creep resistance after long salt spray exposure and do not delaminate over partially cured primer layers. A two-pack polyamide-cured epoxy topcoat is modified with RH-NB-ES12K at 5–12 wt% on total resin solids. The silicone oil is added during let-down after the mill-base grind to avoid excessive high-shear degradation of the siloxane chain. A high-shear disperser at 800–1200 rpm for 10 min is sufficient; the batch is then filtered through a 60 µm mesh. Application on blast-cleaned Sa 2½ steel uses an airless sprayer at 180–210 bar with a 0.015–0.019 in tip, giving 80–120 µm dry film per coat. Pot life at 23 °C is monitored by ISO 9514; with the modifier held below 12 wt%, usable pot life remains above 45 min. Recoat windows beyond 48 h require surface activation or sanding because siloxane enrichment at the interface can reduce cross-cut adhesion to below grade 1 under ISO 2409. Corrosion testing is performed under ISO 9227 neutral salt spray for 1000 h, with scribe creep measured against ISO 12944-6; abrasion resistance is checked with ASTM D4060 using CS-17 wheels at 1000 g load for 1000 cycles. Initial water contact angle is used as a quality check by sessile drop under DIN EN 828; a value below 90° on the cured topcoat may indicate siloxane migration into the pigment grind. The terminal painted steel assembly is used for wind turbine towers and coastal process skids where the topcoat must retain hydrophobic surface behaviour after UV exposure.
Cotton and polyester/cotton blended fabrics are finished with a reactive silicone softener system based on RH-NB-ES12K dispersed in water. The pad bath is prepared with 15–35 g/L of the epoxy silicone oil, 2–5 g/L of a nonionic emulsifier, and 5–10 g/L of polyethylene softener; magnesium chloride hexahydrate at 2–5 g/L is used as Lewis acid catalyst to open the oxirane ring during curing. The fabric is passed through a two-roll padder at 2.5–3.0 bar nip pressure and 70–80% wet pick-up, then dried at 110 °C for 60 s and cured at 150–160 °C for 90–120 s. Durable crease recovery angle is tested according to AATCC 66; dimensional stability after home laundering uses AATCC 135; colourfastness to washing is checked under AATCC 61 2A; wet and dry crocking are assessed per ISO 105-X12. The finish is designed for woven shirting and workwear where discrete reactive crosslinking improves smoothness after 10 washing cycles. Because the epoxy groups react with hydroxyl groups on cellulose, the softened hand is set during the cure stage rather than relying on hydrophobic adsorption alone. Amino silicone softeners are incompatible in the same bath because amine-epoxy reaction increases viscosity and deposits on the padder rolls. Prolonged heat exposure above 170 °C can cause yellowing; whiteness index should be tracked by ISO 105-J02 on white goods.
In two-part epoxy structural adhesives cured at 23 °C, low-temperature impact peel resistance often falls below automotive body-shop requirements after moisture ageing. RH-NB-ES12K is evaluated as a flexibilizing co-resin at 20–30 wt% of total epoxy resin, replacing a portion of the DGEBA base resin. The A-side and B-side are mixed through a static mixer with 12–16 elements at a bead diameter of 1.5–2.5 mm. The adhesive is applied to cold-rolled steel coupons that have been degreased and abraded to Ra 0.7–1.2 µm. Tensile properties are measured on cured plaques under ISO 527-2; single-lap shear is measured on 1.5 mm steel to ISO 4587 at 2 mm/min; impact peel is measured under ISO 11343 at 2 m/s. The silicone-modified network absorbs more energy before crack propagation, but lap shear generally moves downward as the siloxane content increases. Above 30 wt%, cohesive failure mode can shift to interfacial failure on oily substrates, so production lots are screened with ISO 527-2 elongation and ISO 4587 lap shear before release. The terminal assembly is typically a bonded automotive closure panel or a multi-material battery tray where low-temperature toughness is specified by the OEM.
Sintered aluminium pumps, valve bodies and pneumatic fittings with interconnected porosity are sealed by vacuum impregnation to prevent through-wall leakage. A low-viscosity sealant is prepared by diluting RH-NB-ES12K with a difunctional methacrylate monomer to a mixed viscosity of 150–500 mPa·s at 25 °C. The parts are loaded into a vacuum impregnation chamber and held at 5–10 mbar for 10 min. The sealant is then transferred under vacuum into the chamber, and pressure is raised to 0.5–1.0 MPa for 15–20 min. After pressure release, the parts are spin-rinsed to remove surface excess and then cured in hot water at 90 °C for 30 min, followed by a forced-air post-cure at 120 °C for 60 min. Helium leak testing is performed according to ASTM E493 on parts requiring hermetic sealing; comparative pore uptake is monitored by weight gain before and after impregnation. Because the epoxy-functional silicone oil contains no amine, corrosion risk on sintered ferrous parts is lower than with amine-based sealants. The terminal sintered aluminium component is used in fuel-vapour separators, pneumatic valve bodies and pump housings where through-wall porosity must be sealed without closing mounting threads.
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Multicomponent Copolymerization Epoxy Silicone Oil RH-NB-ES12K is supplied as a low-volatility, epoxy-functional polysiloxane prepared by simultaneous copolymerization of a cyclic dimethylsiloxane, a vinyl-functional siloxane oligomer, and an epoxy-bearing olefin in the presence of a platinum hydrosilylation catalyst. The product is controlled to an epoxy value of 0.15–0.25 mol/100 g, a kinematic viscosity at 25 °C of 900–1500 mm²/s when tested by ASTM D445-21, and a refractive index at 25 °C of 1.415–1.435 when tested by ISO 489:2022. Volatile content after 3 h at 105 °C is ≤1.0% by ISO 3251:2019. The epoxy groups are distributed along the siloxane backbone rather than only at chain ends; multiple covalent attachment sites per molecule reduce silicone migration after cure relative to monofunctional or bifunctional epoxy silicone oils.
In filled epoxy adhesive mixing, the product is typically incorporated at 2.0–5.0 wt% relative to the base resin using a planetary mixer with wall scrapers rotating at 20–30 rpm. In a 500 L planetary mixer containing 300 kg of bisphenol A diglycidyl ether and 10–15 kg of RH-NB-ES12K, direct injection into a high-speed disperser vortex has produced localized gel particles exceeding 200 μm when the addition rate exceeds 0.5 kg/min. Pre-dilution at 1:1 by weight with the base epoxy resin before dispersion eliminates the observed gel-particle formation and maintains filter pressure rise below 0.3 bar during a 2 h transfer cycle.
Batch-to-batch variation reported on the certificate of analysis is typically ±0.03 mol/100 g for epoxy value and ±150 mm²/s for kinematic viscosity. The oil is filtered through a 10 μm absolute filter before drumming, yielding a maximum particle count of 120 particles per mL above 10 μm when tested according to ISO 4406:2021 with an optical particle counter. This cleanliness level is relevant for electronic-grade adhesive and encapsulant lines where dispenser nozzle clogging below 0.2 mm internal diameter is a documented field failure mode.
Conventional epoxy silicone oils are commonly linear polydimethylsiloxanes capped with glycidoxypropyl groups at both chain ends. RH-NB-ES12K has a higher epoxy value by design because the copolymerization places reactive glycidyl functions at multiple positions along the siloxane backbone. In a cured DGEBA network at 3 wt% loading, the pendant architecture produces a smaller decrease in glass transition temperature per unit of silicone loading than a terminal epoxy silicone oil of equivalent siloxane molecular weight. Dynamic mechanical analysis of a representative anhydride-cured system containing RH-NB-ES12K retained a storage modulus at 40 °C of 2.6 GPa, while a terminal epoxy silicone control at the same loading produced 2.2 GPa; the difference widened after 30 d at 85 °C and 85% RH.
| Property | Test Method | RH-NB-ES12K | Conventional Terminal Epoxy Silicone Oil |
|---|---|---|---|
| Epoxy value | ASTM D1652-11 | 0.15–0.25 mol/100 g | 0.06–0.12 mol/100 g |
| Kinematic viscosity at 25 °C | ASTM D445-21 | 900–1500 mm²/s | 200–600 mm²/s |
| Volatile content after 3 h at 105 °C | ISO 3251:2019 | ≤1.0% | ≤2.5% |
| Refractive index at 25 °C | ISO 489:2022 | 1.415–1.435 | 1.405–1.418 |
| Epoxy architecture | MALDI-TOF mass spectrometry | Random pendant epoxy along polysiloxane chain | Terminal epoxy only |
| Surface migration tendency in cured DGEBA after 7 d at 85 °C | Static water contact angle change | ≤3° | ≥8° |
The higher epoxy value and pendant placement allow RH-NB-ES12K to function as a reactive flexibilizer rather than a nonreactive internal release agent. In adhesive formulations, this difference translates to lower interfacial silicone accumulation after cure, which is critical for secondary bonding, printing, and plasma treatment steps.
At addition levels from 2 wt% to 5 wt%, the oil acts primarily as a compatibilizer and flexibilizer. Above 5 wt%, phase separation can occur before cure, especially in bisphenol F epoxy systems with high aromatic content. Optical transmission at 600 nm through a 10 mm path-length cell drops from 92% at 4 wt% loading to 78% at 6 wt% loading after 24 h at 25 °C. Differential scanning calorimetry at 10 K/min indicates a cure onset shift of −6 °C to −8 °C at 3 wt% loading, while total reaction enthalpy changes by less than 5%. Production batches operating near the 5 wt% upper boundary should use gravimetric dosing with tolerance of ±0.2 wt% to avoid batch-to-batch variation in cured modulus.
Typically, solventless epoxy sealant producers disperse the oil into the resin phase before adding fillers and rheology modifiers. In a 200 kg batch of two-component sealant, a final loading of 3.5 wt% RH-NB-ES12K lowers the low-shear complex viscosity by 10–15% at 0.1 s⁻¹ when measured on a rotational rheometer, while high-shear viscosity at 100 s⁻¹ remains within 5% of the unmodified control. This shear-dependent effect improves tooling without sacrificing sag resistance.
On cold-rolled steel, mill-finish aluminum, and glass substrates, the epoxy functionality of RH-NB-ES12K engages in covalent bonding with surface hydroxyls. Lap-shear specimens prepared according to ISO 4587:2003 on aluminum bonded with a DGEBA-amine hardener system show an increase in tensile shear strength from 11.6 MPa to 14.2 MPa when 3 wt% RH-NB-ES12K is added. After 14 d of immersion in deionized water at 60 °C, the retention of lap-shear strength is 82% for the modified system versus 68% for the unmodified control. The oil also reduces interfacial blush at the bondline edge, attributed to lower uncured resin migration during open time at 50% RH.
Potting and encapsulation evaluations under thermal cycling from −40 °C to 125 °C have been performed with an anhydride-cured bisphenol A system. After 1000 cycles using a 15 min dwell and 10 K/min ramps, a formulation containing 3 wt% RH-NB-ES12K exhibited no cracking at the wire-frame interface and showed a total mass loss of 0.08% after 24 h at 125 °C under 10⁻⁶ torr in ASTM E595-15. The same formulation’s coefficient of thermal expansion below glass transition increased by 12% relative to the unmodified resin, which must be accounted for in finite-element stress simulation of large-format IGBT modules.
In hybrid epoxy-polyurethane protective coatings, silicone oil migration to the air interface can reduce recoat adhesion after weathering. Incorporating 1.5–3.0 wt% RH-NB-ES12K instead of a nonreactive polydimethylsiloxane oil preserves surface wetting tension above 34 mN/m after 7 d at 23 °C and 50% RH. Recoat adhesion by cross-cut tape test under ISO 2409:2020 remains at classification 0 or 1, whereas a nonreactive silicone oil control falls to classification 3 after 500 h of QUV-A exposure because the unpolymerized silicone fraction migrates and forms a weak boundary layer.
Published data for low-VOC coil-coating primers formulated with RH-NB-ES12K are limited. Laboratory drawdown studies on chrome-pretreated aluminum with a formulation containing 2 wt% of the product show no increase in cratering and maintain pencil hardness at 2H, but long-term production line performance has not been published. Specific qualification is required for systems that must cure below 150 °C metal peak temperature and meet ≤50 g/L VOC limits.
Compared with monomeric silane coupling agents such as 3-glycidoxypropyltrimethoxysilane, RH-NB-ES12K does not release methanol during hydrolysis and provides a thicker, more flexible interfacial layer. In a representative E-glass fiber sizing formulation, the epoxy silicone oil yields lower single-filament friction and improved strand integrity, but the absence of trialkoxysilyl groups reduces covalent condensation with fully hydrolyzed silica surfaces. Formulations therefore often combine 1 wt% of a silane coupling agent with 2 wt% RH-NB-ES12K to balance interfacial stiffness and strand cohesion.
Material safety data and regulatory documentation supplied with RH-NB-ES12K indicate that the product is not classified as a hazardous mixture under Regulation (EC) No 1272/2008 in the form supplied. Heavy-metal content tested by IEC 62321-8:2017 is below quantification limits for lead, cadmium, mercury, and hexavalent chromium. Halogen content by EN 14582:2016 is <0.09 wt% for chlorine and <0.09 wt% for bromine. The product should not be used in food-contact applications without a specific written clearance under FDA 21 CFR 175.300 or an equivalent positive list.
| Regulatory Area | Method or Standard | Typical Data or Status |
|---|---|---|
| RoHS restricted substances | IEC 62321-8:2017 | Lead, cadmium, mercury, and hexavalent chromium below quantification limits |
| Halogen content | EN 14582:2016 | Chlorine <0.09 wt%; bromine <0.09 wt% |
| Electronics outgassing | ASTM E595-15 at 125 °C for 24 h | Total mass loss 0.35%; collected volatile condensable materials 0.05% in a representative anhydride-cured formulation |
| SVHC notification | REACH Regulation 1907/2006 | Not expected to contain substances of very high concern above threshold |
| Flash point | ISO 2719:2016 Pensky-Martens closed cup | >100 °C |
Storage at 5–30 °C under nitrogen headspace is recommended. Exposure to ambient air above 60% RH for more than 4 h can initiate slow hydrolysis of residual silanol groups, increasing viscosity by 5–10% within 90 d. Combination with aliphatic amine accelerators at processing temperatures above 60 °C is not recommended because the epoxy groups can undergo rapid homopolymerization before bulk cure, causing localized hot spots and nonuniform crosslink density. For anhydride-cured systems, addition of 0.1–0.3 phr of a tertiary amine accelerator is sufficient to control gel time between 20–40 min at 80 °C; higher accelerator levels combined with RH-NB-ES12K may shorten pot life below 10 min.
At −20 °C, the dynamic viscosity of RH-NB-ES12K increases to approximately 3000–5000 mPa·s. Cold-weather dispensing lines should heat the reservoir to 20–30 °C and maintain line pressure below 4 bar to avoid cavitation in gear pumps. Published data for prolonged pumping above 6 bar with this specific viscosity grade is limited.
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