配方类型:

LEATHER

配方说明:

Syntan (Synthetic Tanning Agent) (French Patent 900,655)

配方组成:

Oxalic Acid/1
Phenol/94
Reflux for 45 minutes while stirring. Heat in vacuum at 75'C. Then
add slowly
Sulfuric Acid H2O/50
30% Formaldehyde/70

配制方法:

at 50 to 60'C. and heat in vacuum at 70 to 75'C. for 2 hours until completely water soluble. Neutralize with alkali and adjust with an organic acid to a pH of 3 to 4.