Bis-Aminopropyl Functional Siloxane – The Premium Upgrade for Polyimide, Epoxy & Polyurethane Systems ChangFu® BN12

ChangFu^® BN12 {1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, CAS No.: 2469-55-8} is a high-performance double-ended functional siloxane. With its unique molecular structure design and excellent reactivity, it has become a key additive in the field of polymer material modification. Both ends of its molecule contain reactive primary aminopropyl functional groups, which can efficiently react with epoxy, isocyanate, carboxyl and other active groups. It can significantly improve toughness, thermal stability, weather resistance, adhesion and surface properties of polymers, and effectively support the performance upgrading of high-end materials such as polyimide, polyurethane and epoxy resin. With high purity and stable quality, ChangFu^® BN12 is widely used in silicone synthesis, resin modification, advanced coatings, adhesives and special polymer materials, providing reliable performance support for high-value product development and industrial applications.

Product Features:

• Dual-terminal amino reactivity

      Featuring bis-aminopropyl functional groups at both molecular ends, the product exhibits high reactivity and can react efficiently with epoxy, isocyanate, carboxyl and other functional groups. It is widely used in polymer end-capping, copolymer synthesis, and modification of high-performance materials, providing stable and reliable chemical linking performance. Its well-defined structure ensures consistent reactivity and avoids side reactions, supporting precise molecular design for advanced polymers.

• Excellent thermal stability and hydrolysis resistance

      The unique siloxane backbone delivers outstanding thermal stability and excellent hydrolysis resistance. It maintains stable performance even under high-temperature and high-humidity conditions, ensuring long-term storage stability and reliable application performance in harsh environments. It effectively reduces material degradation, yellowing and performance loss, extending service life in outdoor, automotive and electronic applications.

• Excellent compatibility with organic resins

      The product combines the high reactivity of organic amines with the low surface energy and flexibility of siloxanes. It shows excellent compatibility and uniform dispersibility in polyurethane, epoxy, polyamide, polyimide and other resin systems, helping to improve overall material performance and processing stability. It enhances interfacial adhesion, toughness, weatherability and surface smoothness without compromising resin strength or curing properties.

• Available in high-purity grade

     To meet the strict requirements of high-end and high-performance materials, we provide customized high-purity grade products according to different application needs. This ensures excellent consistency, low impurity content and stable quality for demanding fields such as electronics, aerospace and special polymers.

Applications:

• Organosilicon Intermediate – End-Capping Agent

     It is mainly used as an end-capping agent and structural modifier in the synthesis of amino-functional silicone oils, especially diaminopropyl-terminated silicone oil, which is a core raw material for high-performance textile softeners, personal care emulsions, mold release agents, and lubricants.

     It can also be used in the preparation of organosilicon-epoxy, organosilicon-polyimide, and organosilicon-polyamide block copolymers, effectively improving material toughness, thermal stability, surface smoothness, and weatherability.

• Resin Modifier

     Polyurethane System: Introduces siloxane segments into the polyurethane molecular chain, significantly enhancing weather resistance, water repellency, low-temperature flexibility, surface smoothness, and anti-blocking performance.

     Epoxy Resin System: Acts as a curing agent, toughening agent, or modifier to reduce internal stress and brittleness, improve adhesion, hydrophobicity, and damp-heat aging resistance of epoxy materials.

     Polyamide & Polyimide System: Serves as an effective comonomer to prepare organosilicon-modified polyamide and polyimide, improving processing performance, high and low temperature resistance, dielectric properties, and mechanical stability.

• Textile Auxiliaries & Surfactants

     It is a key intermediate for high-end textile softeners, smoothing agents, antistatic finishing agents, and hydrophilic modifiers, providing fabrics with durable softness, smooth hand feel, static resistance, and improved dyeing uniformity.

     It is also widely used in the synthesis of polyether-modified organosilicon surfactants, which can be applied in emulsifiers, defoamers, leveling agents, and personal care emulsifying systems.

ChangFu^® BN12 (1,3-Bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, CAS 2469-55-8) is a high-purity dual-amino functional siloxane with outstanding reactivity, compatibility, and storage stability. It is widely used as a preferred additive and key intermediate in resin modification, organosilicon synthesis, surface treatment, and advanced material formulation. It serves as an efficient modifier for polyurethane, epoxy, polyamide, and polyimide resins, significantly enhancing toughness, hydrophobicity, weather resistance, low-temperature flexibility, and dielectric properties. It is also a critical building block for amino-functional silicone oils, textile softeners, antistatic agents, and high-performance surfactants. In electronics and semiconductor fields, BN12 acts as a curing agent and toughening component for epoxy molding compounds (EMCs), supporting high-reliability packaging applications.

As a high-purity specialty siloxane intermediate, ChangFu^® BN12 delivers consistent batch-to-batch quality and stable reactivity to support large‑scale industrial production. Its low impurity profile and optimized molecular structure make it particularly suitable for high‑end sectors including electronic packaging, aerospace composites, high‑performance coatings, and advanced textile chemicals. Whether used as an end‑capping agent, resin modifier, or crosslinking component, BN12 effectively elevates durability, toughness, and surface properties while ensuring process stability. Backed by full technical service, complete certification support, and reliable global supply, ChangFu^® BN12 is your trusted choice for developing competitive, high‑value polymer products and meeting stringent industry standards.

(Note: The specific application effects need to be determined according to the actual usage conditions. Welcome to contact our technical team for more product information and technical support.)

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Key words:1,3-Bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane; CAS 2469-55-8; Double-ended functional siloxane; Polyimide, polyurethane and epoxy resin.