Study On The Stabilisation Of The Leather Tanned By Complex Combination Tannage

In order to reduce or get rid of the pollution of Cr3+,Cr6+ from process of chrome tanning, study on the chrome-free and complex combination tannage have done in this work, by which a higher hydrothermal stability and good physical-mechanical properties of the leather are obtained.We choose and act vegetable tannins, aluminium tannin, phosphonium salt and oxazolidines as main tanning agents and have done the tanning experiment of the complex combination tannage by introducing the third tanning agent into the vegetable tannins- aluminium combination tannage and the vegetable tannins-oxazolidines combination tannage on the basis of the hide powder, and have found that hide-powder (64%), vegetable tannins (18%), phosphonium salt (9%), aluminium tannin (9%) or hide powder (59%),vegetable-tannins (25%), oxazolidines (8%), aluminium tannin (8%) is better term. Then we have designed the tannages and done the tanning experiment on the basis of sheep pickle residue in order to obtain better tannage, that is, pickle- pretreation -vegetable tanning-aluminium tanning-oxazolidines tanning; pickle- phosphonium salt tanning- basicification - pretreation- vegetable tanning- aluminium tanning.Based on the results of the leather-tanning experiment, we have designed the tannage, tanned the sheepskin pickle, have tested the shrinkage temperature of the leather during the tanning and after the tanning, and have tested the softness, the...