Process for making improved corrosion preventive zinc cyanamide

Details Process for making improved corrosion preventive zinc cyanamide Process for making improved corrosion preventive zinc cyanamide

C - Chemistry, Metallurgy

01

G

C01G 9/00 (2006.01) C01C 3/16 (2006.01) C09D 5/08 (2006.01)

Patent

CA 2084164

Improved corrosion preventive pigment grade zinc cyanamide suitable for protective mirror backing coatings is prepared by reacting a totally hydrated zinc oxide slurry with hydrogen cyanamide. The reaction is carried out while maintaining a stoichiometric excess of zinc oxide at an elevated temperature between about 75° and about 85°C. The reaction mixture is provided in a condition free of inorganic soluble salts and free of anions containing sulfur such as sulfides or sulfates.

Cyanamide de zinc de qualité pigment, agent de prévention amélioré anticorrosion, utilisable dans les revêtements protecteurs de supports de miroirs; il est préparé par réaction d'une suspension d'oxyde de zinc totalement hydratée avec du cyanamide. La réaction est effectuée en maintenant un excès stoechiométrique d'oxyde de zinc à une température élevée, soit entre environ 75 et 85 °C. Le mélange réactionnel est exempt de sels minéraux solubles et d'anions renfermant du soufre, comme les sulfures ou les sulfates.

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