BRB SILANIL® 919

BRB Silanil® 919 is a reactive chemical containing an aminopropyl organic group and a triethoxysilyl inorganic group. CAS# is specified as 919-30-2.

Chemically, BRB Silanil® 919 is designated gamma aminopropyltriethoxysilane. Possessing both organic and inorganic reactivity, BRB Silanil® 919 can react with organic resins and elastomers as well as with the surface of inorganic materials such as fiberglass and silica. This aminopropyl functional silane is one of a series of organofunctional silane chemicals.

• 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
• Increased transparency of fiberglass composites

• Good coupling agent to improve adhesion of many plastics, resins, and elastomers to inorganic materials and surfaces
• Very useful for improving the properties of mineral-filled rubber
• Proven additive for foundry resins as a coupling agent to provide moisture resistance and better mechanical properties
• Effective coupling agent to modify functional groups on glass fiber surfaces during the size process

Primer Solution

BRB Silanil® 919 can be dissolved in isopropanol or other solvents and used as a primer to improve adhesion. Two methods are commonly suggested:

1. Dissolve 5% BRB Silanil® 919 in isopropanol, wipe onto the substrate, and dry at 75°C for 15 minutes or at room temperature for 30 minutes before applying a coating.
2. Dissolve 40% BRB Silanil® 919 in isopropanol, add 5% water, allow to stand for 6 hours, dilute to 5% active with isopropanol, and apply as in Method 1.

For adhesion improvement, the best performance is realized when BRB Silanil® 919 is used as a primer.

Adhesion Promoter in Coatings and Adhesives

BRB Silanil® 919 improves adhesion in coatings and adhesives, particularly in polyurethanes, epoxies, phenolics, and others, to glass and metal surfaces. Recommended dosage is 0.2–2.0 wt%. Proper pH adjustment and induction times are necessary for optimal performance.

Glass Fiber Size Process

BRB Silanil® 919 can be applied to inorganic surfaces such as glass fibers using dilute aqueous solutions (0.1–0.5%). Proper agitation is required to avoid gel formation.

Mineral Filler Treatment

Minerals can be treated by slurrying in aqueous solutions or blending with the silane using isopropanol or etherglycol. Treated surfaces can be air-dried or dried at 104–121°C.

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