Glass Fiber and Mineral Filler Treatment: BRB Silanil® 581 can be applied to inorganic surfaces e.g. glass fibers as a dilute aqueous solution. 0.2 to 1.5 % is recommended to add together with organic resin, water and other additives to form film on glass surface during size process.
In the case of siliceous mineral fillers, the mineral can be treated by slurrying in the aqueous solution likes BRB Silanil® 581 at 0.2-3.0 % based on filler weight.
The silane dosage is up to particle size or surface area of fillers which is shown in the table I.
After applying this silane, the glass or mineral surface can be air-dried or dried briefly at 104 to 121°C (220-250 °F) to effect complete condensation of silanol groups at the surface and to remove water. Optimum application and drying conditions, such as time and temperature, should be determined for each application before use in a commercial process.
| Average particle size of fillers |
BRB Silanil® 581 dosage (% on filler wt.) |
| <1 micron |
3.0% |
| 1to 10 microns |
2.0% |
| 10 to 20 microns |
1.5% |
| > 20 microns |
0.2 – 0.5% |
Waterbased Primer: BRB Silanil® 581 can be diluted by DI water to be 10-20% concentration and apply on the inorganic substrates as primer before top coat to improve adhesion performance. It is recommended to wipe onto the glass or metal substrate; dry at 75°C for 15 minutes or at room temperature for 30 minutes; then apply coating.
Adhesion Promoter in Coatings and Adhesives: BRB Silanil® 581 will also improve the adhesion of many coatings and adhesives, acrylics latexes, polyurethane dispersion (PUD) and other waterbased systems, to glass and metal surfaces. BRB Silanil® 581 can be added directly to a resin system without other additives or pigments at 0.5 to 4.0 % based on resin solid weight to promote unprimed adhesion.
