BRB SILANIL® 533 ESO

BRB Silanil® 533 ESO is a silane oligomer containing gamma-glycidoxy groups and methoxy groups.

When comparing with monomeric epoxy silanes, BRB Silanil® 533 ESO provides less emission of methyl alcohol upon hydrolysis since partial condensations in the parts of methoxy groups are happened resulting in the reduction of the number of methoxy groups and the change of structure from monomer to oligomer.

• BRB Silanil® 533 ESO gives lower VOC during application (VOC from hydrolysis reaction) than monomeric epoxy silanes.
• When using in water-based system, BRB Silanil® 533 ESO provides better stability of formulated product than monomeric epoxy silanes due to less hydrolysis sensitivity of oligomeric structure.
• BRB Silanil® 533 ESO can provide greater grafting efficiency on polymer chains containing amino, hydroxyl, or carboxyl functional groups since there is higher content of epoxy groups per molecule when comparing with monomeric silanes.

BRB Silanil® 533 ESO easily hydrolyzes upon contact with water or moisture, where methoxy groups transform to silanol groups and release methanol as a byproduct. The silanol groups are highly reactive, ready to bond hydroxyl groups in inorganic fillers or substrates, and can also crosslink among themselves. Meanwhile, the epoxy groups in BRB Silanil® 533 ESO can undergo ring-opening reaction with nucleophiles such as amines and alcohols, creating covalent bonds, which may require a catalyst.

Coupling Agent in Metallic Pigment Coatings: BRB Silanil® 533 ESO improves dispersion ability of metallic fillers or pigments in water-based systems such as epoxy coatings containing zinc or other metallic pigments. Surface of metallic fillers can be treated by mixing with the silane solution at medium shear for several minutes. The silane solution can be prepared by dissolving 10-20% silane concentration in water or mixture of water and solvents, with an acid solution added to accelerate hydrolysis (pH range of 4-5 is recommended). Dosage of silane can vary from 0.2-2 wt% based on weight of metallic fillers.

Crosslinker for Polymer Modification: BRB Silanil® 533 ESO can modify polymer structure by simple addition into polymerized water-based resins such as acrylic latexes. It is directly added to resin at 0.2-2 wt% based on resin solid content, requiring an induction time of at least 24 hours prior to addition of other additives, fillers, and pigments.

Adhesion Promoter in Coatings and Adhesives: BRB Silanil® 533 ESO enhances adhesion performance of coatings and adhesives on inorganic surfaces. It is directly added into solvent-based or water-based resins with a required induction time. For water-based systems, pH should be close to neutral (pH 7) to control hydrolysis during storage.

Store in dry and cool (approx. 20-25°C) conditions. After opening, avoid exposure to atmospheric moisture. Use inert gas (e.g., N₂ gas) to purge into the container after opening to prevent hydrolysis by moisture.