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| Addid 930 |
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Vinyl triethoxy-functional silane adhesion promoter
ADDID 930 is a vinyl triethoxy-functional silane adhesion promoter. It is soluble in a large number of organic solvents and highly compatible with many different resin systems. In humid air, it is moderately stable against condensation reations. ADDID 930 is only sparingly soluble in neutral water. It is used to prepare a highly reactive, but stable silane triol solution, suitable as eg, a water-borne primer for the pretreatment of glass, mineral fillers or silica by the following method: hydrolyse ADDID 930 by adding three parts to two parts of a weak aqueous percloric, hydrochloric or sulphuric acid solution (PH approximately 3.0) under constant stirring. After approximately 15 min., the mixture is homogeneous and clear. In addition to silane triol, watersoluble siloxanols are also formed. The condensation reaction continues, resulting in a percipitate of insoluble siloxane after just a few minutes. If the aqueous solution is clear, it is advisable to reduce the concentration of silane triol by addidng (preferably) distilled water. The pot life can be extended by adding a less protonic acid, such as phosphoric acid, and reducing the amount of acid. The waterborne concentrates can be diluted with organic solvents, preferably alcolohols such as ethanol and 2- propanol. The adhesion promotion effect is produced by a reaction of the silanol on the substrate, both with itself and with appropriate groups on the substrate. This yields a siloxane film that adheres to the substrate and has free vinyl groups that can react with the binder. By reacting with both the substrate and the binder of the coating, ADDID 930 bonds them together.
Since binders vary so widely, it is standard practice to carry out preliminary tests to determine the optimum concentration of an ADDID팜 product for a particular application. |
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Supplied as 100% Active Substance
Appearance,color : Clear
Density, 25'C (77'F), g/ml : 1.05
pH value : 1.439 - 1.445
Viscosity, 25'C (77'F), mm2/s : 0.1 - 2
Flash point, 'C/'F : >60/>149
Ignition temperature, 'C/'F : 235/455 |
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