Formaldehyde → Phenol-Formaldehyde Urea

Participants

Reaction Steps

Phenol/formaldehyde premix T81 was made to have a phenol-formaldehyde molar ratio of 1:3, with about 4.5% free phenol and 1.8% free formaldehyde. Sufficient water was added to yield an aqueous resole resin solution mixture having about 45% solids content. An aqueous solution of urea (40% by weight of urea) was added T81 premix in a ratio of 9:1 T81 premix to urea solution (by weight), while the resulting solution was stirred to ensure homogeneous mixing.

Provenance & Evidence