BRB Silanil® 276

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

BRB Silanil® 276 is reactive in free radical chemistry as in hydrolysis chemistry and forms siloxane bonds through moisture curing. When used as a special crosslinker in PE, especially in wire and cables jacket, pipe and foam, BRB Silanil® 276 can give better heat and weather resistance compared to other crosslinkers.

BRB Silanil® 276 is commonly used for modification of various types of emulsion polymerization. It can be added to latex as monomer to form vinyl modified latexes. It can also be added to various synthetic rubbers to form vinyl copolymers.

Moisture Scavenger is one of the potential applications. It is applied in synthetic resin for surface coating and adhesives such as polyurethane with fast hydrolysis rate of BRB Silanil® 276 to catch H₂O in moisture cure system in order to prolong the shelf life of the resin.

BRB Silanil® 276 can as well be used for hydrophobic modification purposes in which a hydrolysable group is able to bond or interact with inorganic surfaces such as Glass, Quartz, and Steel. It then leaves a hydrophobic vinyl group on top.

• High reactivity
• Good covalent bonding by free radical mechanism

Crosslinker for Polyethylene
Silane crosslinking is a type of chemical crosslinking process to create a network structure of thermoplastic polyethylene to be three-dimensional macromolecule structure, changing materials from thermoplastic to near thermoset. Crosslinked Polyethylene, also known as XLPE or PEX, is used in wire/cable insulation, PEX pipe, and PEX foam.

Dosage and Process

• BRB Silanil® 276 dosage recommendation: 2-3% based on polyethylene wt.
• Initiator: Di-Cumyl Peroxide
• Catalyst: Dibutyltindilaurate (DBTDL)
• Recommended twin screw length/diameter for silane grafting is 24-35 L/D ratio.