| 摘要 |
<p>The present invention refers to a new process meant to chrome and/or vegetable leather tanning. The process proposed by the invention comprises the steps of bating, conditioning and chrome and/or vegetable tannage. The conditioning uses hydroxy-butaldehyde which reacts blocking the amines of the collagen and releasing carboxyls. This reaction reduces the isoelectric point to 4.0 - 4.5 making the hide susceptive to the effective chrome tannage, linking the carboxyls, or to tannin, linking through hydrogen bridges. Hydroxy-butaldehyde is used in the conditioning, in a proportion of 2.5 - 3.0 % over the weight of the delimed hide, in a concentration of 40 +/- 2 %, and with a pH of 4.2 - 4.4, the reaction time being from 3 to 4 hours.</p> |
