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| 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. |
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