BRB SILANIL® 258

BRB Silanil® 258 is an epoxy silane which contains reactive glycidoxy and methoxy groups.

CAS# is specified as 2530-83-8.

• Treatment on glass fiber for use in reinforced areas.
• Treatment on mineral surfaces for use in mineral-filled plastics.
• Adhesion promoter to enhance bonding of a polymer coating or adhesive to glass.

• Organic and inorganic reactivity.
• Improves adhesion.
• Increases composite strength properties.
• Increased composite wet and dry tensile strength and modulus.
• Increased composite wet and dry flexural strength and modulus.
• Increased wet and dry compressive strength.

• Better appearance without yellowing issue for top coats or clear adhesives.
• Better filler wet-out and dispersion.
• Lower viscosity of filled liquid resins.
• Improved processability and mechanical properties of composites.

BRB Silanil® 258 will be hydrolyzed when combined with water to form silanol reactive group and release a byproduct as methanol. The epoxy functional group will be grafted or interacted on the organic polymer chain.

Fiber Size: BRB Silanil® 258 can be applied on inorganic surfaces, e.g., glass fibers and fabrics, as a dilute aqueous solution (0.1 to 0.5% silane concentration). Aqueous solutions are prepared by adjusting the pH of the water from 3.5 to 4.5 with about 0.1% acetic acid, then adding the silane and stirring. The mixture is stirred for about 15 minutes to form a clear, homogeneous solution.

Mineral Filler Treatment: For mineral fillers, the mineral can be treated by mixing with the silane solution at very low shear for several minutes. The silane solution is prepared by mixing BRB Silanil® 258 with isopropanol, water, and acetic acid to accelerate hydrolysis.

Primer Solution: BRB Silanil® 258 can be used as a primer by preparing a solution with methanol, isopropanol, or ether glycol. Prehydrolyzed primers may include water addition for enhanced adhesion properties.