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BIS-AMINOSILANE- POLYMER

Bis-Aminosilane Polymers are a class of organosilicon compounds characterized by dual amino functional groups (−NH2−NH 2 or −NHR−NHR) attached to a silane backbone. These polymers exhibit unique hybrid properties derived from organic amines and inorganic siloxane structures, making them critical in high-performance coatings, adhesives, and composite materials.

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Physical and chemical properties

Key Features:

Dual Reactivity:

The amino groups ( $- {NH}_{2}$ ) enable reactions with epoxies, isocyanates, and other electrophiles.
Hydrolyzable silane groups ( $- {Si(OR)}_{3}$ ) form siloxane networks ( $- Si-O-Si -$ ) via condensation, enhancing adhesion to inorganic substrates (e.g., glass, metals).

Enhanced Interfacial Bonding:

Acts as a molecular bridge between organic polymers and inorganic surfaces, significantly improving interfacial adhesion in composites.
Reduces delamination in harsh environments (humidity, thermal cycling).

Flexible-Tailored Structure:

Tunable chain length ( $n$ in ) and amino group density allow customization for specific applications.
Common variants include (e.g., $x = 3$ for γ-aminopropyl).

Curing Behavior:

Participates in room-temperature curing with epoxy resins, forming dense crosslinked networks.
Self-condenses to create water-resistant barriers when used as surface primers.

Application

Applications:

Adhesives & Sealants: Co-curing agent for epoxy/polyurethane systems.
Composite Materials: Coupling agent for fiberglass/carbon fiber-reinforced polymers.
Surface Modification: Hydrophobic coatings for corrosion prsotection.
Electronic Encapsulants: Moisture scavenger in IC packaging (reacts with H₂O).

Packaging and storage

1. Primary Container

Material: High-density polyethylene (HDPE) drums with polytetrafluoroethylene (PTFE) inner lining.
Rationale: Prevents moisture ingress and inhibits premature hydrolysis of silane groups.
Size: 20 kg, 50 kg, or 200 kg sealed drums.
Headspace: Filled under nitrogen blanket (O₂ ≤ 0.1%) to minimize oxidation of amino groups.

2. Sealing System

Lid: Double-gasketed, bolt-closure design with desiccant cartridge (indicating silica gel).
Valve: Integrated stainless-steel valve for inert gas purging during dispensing.

3. Secondary Containment