Hexamethylenetetramine → Formaldehyde diurea silicate

Beteiligte Stoffe

Reaktionsschritte

Clay is reacted with sulfuric acid, thereby producing metasilicic acid, which is recovered by filtration. About one mol of said metasilicic acid is mixed with 2 mols of urea, heated to 90° to 150° C. for 20 to 30 minutes, thereby producing white granules of diurea silicate. The said diurea silicate is added to an aqueous solution of hexamethylene tetramine in the ratio of 1:1.5 mols, heated to 70° to 110° C. for 20 to 90 minutes, thereby producing a clear thick solution of poly (formaldehyde diurea silicate) resin, and, upon further heating, a white resin is produced. The said white resin is soluble in acetic acid and produces a clear solution; the unreacted silicic acid is precipitated. The solution of poly (formaldehyde diurea silicate) resin forms a clear tough coating on wood.

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