SEMITECH Amino-Modified Silicone Oil (Amine Value 0.3–0.8 mmol/g)
Amino silicone oil is PDMS co-polymerized with aminosilane coupling agents (APTES or AEAPTES), sitting at the downstream end of a China-concentrated silicone supply chain. China controls ~70% of global silicon metal capacity and over 60% of D4/D5 output — energy-policy or export shifts propagate to amino silicone pricing within one to two quarters.
Technical Specifications
| Supply Chain Layer | Key Materials | China Share | Price Driver |
|---|---|---|---|
| Raw material | Silicon metal (Si), quartz | ~70% global capacity | Power cost, carbon policy |
| Intermediate | D4 / D5 cyclosiloxanes | ~65% global output | MCS plant utilization |
| Functional monomer | APTES / AEAPTES aminosilane | ~55% global supply | Ethanol feedstock, HCl cost |
| Finished fluid | Amino silicone oil (neat) | ~60% global export share | D4 spot price, USD/CNY FX |
| Formulated product | 35% aqueous emulsion | Distributed globally | Logistics, emulsifier cost |
Supply Chain, Upstream Constraints & Price Outlook
China controls the upstream pathway from silicon metal through MCS hydrolysis to D4/D5 cyclosiloxanes and finally amino-functional fluids. Any energy-policy shift or export restriction creates tightness that reaches amino silicone pricing within 4–8 weeks.
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Frequently Asked Questions
Functional Chemistry: Why Amine Groups Matter
Amino-modified silicone oil is PDMS with aminopropyl or aminoethylaminopropyl substituents replacing some methyl groups. Amine value controls substantivity and reactivity: 0.3 mmol/g for surface lubricity with minimal yellowing; 0.5–0.6 mmol/g for balanced softness and durability (hair conditioner sweet spot); 0.8 mmol/g for maximum wash fastness in industrial textile finishing.
Textile Softening: Lubricity, Anti-Static & Hand Feel
Applied at 0.5–3.0% owf from dilute bath, amino groups anchor the silicone to fiber surfaces via ionic bonding, reducing inter-fiber friction 30–50% and surface resistivity by one to two decades. The 35% aqueous emulsion (0.1–0.5 µm particle size) disperses directly into padding baths without solvent. Cure at 130–150°C for maximum wash fastness (≥20 cycles).
Hair Care Conditioning: Mechanism and Formulation
Deposits onto negatively charged, damaged hair cuticles via electrostatic attraction. Typical conditioner carries 0.5–2.0% amino silicone with CTAC or behentrimonium chloride, achieving 40–70% combing force reduction. Amine value ≤0.6 mmol/g minimizes buildup across repeated wash cycles.
+Q: What amine value should I specify for white or light-colored textile finishing?
A: 0.3–0.4 mmol/g — lower amine density minimizes oxidative yellowing. Pair with antioxidant and cure below 150°C.
+Q: What is the difference between neat amino silicone oil and the 35% aqueous emulsion?
A: Neat oil is 100% active, requiring in-house emulsification. The 35% emulsion is pre-emulsified (0.1–0.5 µm), dispersible in cold water, eliminating batch-to-batch variability. Neat oil is preferred for custom formulation flexibility.
+Q: How does amine value affect wash fastness in textile applications?
A: Higher amine value = more ionic anchor points. At 0.3 mmol/g, films survive 5–10 washes; at 0.8 mmol/g with 140°C cure, fastness exceeds 20 cycles.
+Q: Can amino silicone oil be used in leave-in hair care products?
A: Yes — limit to 0.2–0.5% active with amine value ≤0.5 mmol/g to reduce buildup. Combine with volatile cyclomethicone (D5) for better spreadability.
+Q: Why is amino silicone oil pricing sensitive to Chinese energy policy?
A: Silicon metal smelting requires ~13,000 kWh/ton. Power rationing in Yunnan/Sichuan directly reduces D4/D5 output, and amino silicone prices follow within 4–8 weeks.
+Q: What is N% (nitrogen content) and how does it relate to amine value?
A: N% is the nitrogen mass fraction by Kjeldahl or combustion analysis. For monoamine groups: amine value (mmol/g) ≈ N% / 1.401. A fluid with 0.56% N has amine value ~0.4 mmol/g.
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