BRB Silanil 276 (Vinyltrimethoxysilane)

BRB Silanil® 276 is a reactive chemical containing vinyl functionality and a silane hydrolysable group. It is a fast hydrolyzing alkoxy silane type and can be used for many potential applications. CAS# is specified as 2768-02-7.

• Reactive in free radical chemistry as well as in hydrolysis chemistry
• Forms siloxane bonds through moisture curing
• Provides better heat and weather resistance as a crosslinker in polyethylene (PE), especially in wire and cable jackets, pipes, and foam
• Modifies various types of emulsion polymerization by forming vinyl-modified latexes and vinyl co-polymers
• Functions as a moisture scavenger in synthetic resins to prolong shelf life
• Hydrophobic modification for inorganic surfaces such as glass, quartz, and steel

• High reactivity
• Good covalent bonding by free radical mechanism

Crosslinker for Polyethylene

BRB Silanil® 276 is used for silane crosslinking to create a three-dimensional macromolecule structure in thermoplastic polyethylene. This process improves creep resistance, solvent resistance, and mechanical properties of crosslinked polyethylene (XLPE or PEX).

• Recommended dosage: 2-3% based on polyethylene weight
• Initiator: Di-Cumyl Peroxide
• Catalyst: Dibutyltindilaurate (DBTDL)
• Recommended twin screw length/diameter: 24-35 L/D ratio

Polymer Modification

BRB Silanil® 276 modifies polymer structures in both waterborne and solvent-borne surface coating resins. It is commonly used in acrylic latex and introduced during polymerization steps.

• Solvent-borne: Recommended dosage 0.4-10.0% on total monomer weight
• Waterborne: Recommended dosage 0.1-2.0% on total monomer weight
• Add silane during the pre-emulsion stage or at the final 10-15% of monomer feeding time
• Recommended pH for waterborne systems: ≤8.5 for stability

Store in dry, cool conditions (20-25°C). After opening, avoid exposure to atmospheric moisture. Use inert gas (e.g., nitrogen) to prevent hydrolysis.