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| Addid 940 |
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| ADDID 940 is methacrylic-trimethoxy 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 reactions. ADDID 940 is insoluble in neutral water. In weak aqueous acids, it dissolves with vigorous stirring at a pH of 3.5좻4, hydrolysing to form silane triol. This method can be used to prepare highly reactive water-borne solutions of ADDID팜 940 containing up to 10 wt % of the corresponding silane triol. Highly concentrated mixtures only have limited stability, since the silane triol formed condenses to form high-molecular, insoluble siloxanes. If the water-borne solution is clear, it is advisable to reduce the concentration of silane triol by adding (preferably) distilled water. Water-borne concentrates can be diluted with organic solvents, preferably alcohols such as ethanol and 2-propanol. Other factors influencing the stability of the water-borne ADDID팜 940 solution include the type of acid, the amount of catalyst used, the temperature and contaminants, particularly metals. The pot life can be extended by adding a weakly protonic acid, such as phosphoric acid, and reducing the amount of acid (to increase the pH). 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 methacrylic groups that can react with functional groups of the binder. By reacting with both the substrate and the binder, ADDID팜 940 bonds them together. |
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Supplied as : 100% active substane
Appearance,colour : Clear, colorless
Density, 25'C (77'F), g/ml : 1.05
Refractive index, 25'C (77'F), approx : 1.426 - 1.432
Viscosity, 25'C (77'F), mm2/s : 2 - 5
Flash point, 'C/'F : >100/>212
Ignition temperature, 'C/'F : 265/509 |
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