Hexamethylenetetramine → Formaldehyde diurea silicate

HRID 426515

Reaction equation

[Si:1]([OH:5])([OH:4])([OH:3])[OH:2].[NH2:6][C:7]([NH2:9])=[O:8].[NH2:10][C:11]([NH2:13])=[O:12].C1N2CN3CN(C2)CN1C3>>[Si:1]([OH:5])([OH:4])([OH:3])[OH:2].[NH2:6][C:7]([NH2:9])=[O:8].[NH2:10][C:11]([NH2:13])=[O:12].[CH2:7]=[O:8]

Participants

Reactant 2

HCID 4101Hexamethylenetetramine

HCID 86734905Diurea silicate

Product 1

HCID 86734904Formaldehyde diurea silicate

Procedure

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.

Workup

temperature1.5 mols, heated to 70° to 110° C. for 20 to 90 minutes

Sources & evidence

ORD record: ord-16dcd62f7e1b46a39abc2464f27df1eb
Source dataset: uspto-grants-1979_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04169930

Linked notes

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