Formaldehyde → Formaldehyde urea silicate

Beteiligte Stoffe

Reaktionsschritte

The said urea silicate is added to an aqueous solution of formaldehyde in the ratio of 1:1.5 mols, mixed, and the urea silicate goes into solution. The unreacted silicic acid is removed by filtration. About 15% to 25% of the said silicic acid did not chemically react with said urea. To the clear aqueous solution of urea silicate and formaldehyde is added a dilute solution of sulfuric acid until the pH is 4 to 5, then said solution is heated to 70° to 110° C. for 20 to 80 minutes, until the desired viscosity is obtained, thereby producing poly (formaldehyde urea silicate) resin, which is clear in color and may be produced as a thick liquid or as a solid. The said solid resin may be heated to 70° to 80° C. and molded into useful objects.

Herkunft & Nachweise