| The influence of the structure of four kinds of natural unsaturated oil on the oxidation depth was studied. Catalyzer was added to oxidize natural unsaturated oil. The Peroxide value was tested to control the activity of oxidized oil. The results showed: although the iodine value of fish oil was high, the insular double bonds were transformed into conjugated double bonds, which would made fish oil resinoid. The maximal peroxide value of fish oil was 380 mmol/kg. The type of double bonds in tea oil, rape oil and bean oil was isolated double bond, which was highly active. The content of isolated double bond in bean oil was more than that in rape oil and tea oil. The maximal peroxide value of bean oil, rape oil and tea oil was 1568 mmol/kg, 995 mmol/kg, 870 mmol/kg, respectively. That meant the iodine value of oil was not the exclusive factor influencing the oxidation of oil, the configuration and position of double bond played certain role.The influence of tanning pH, time, temperature, peroxide value and dosage on the shrinkage temperature of pickled rabbit skin was researched. The results showed: The Ts of oil tanned pickled skin increased to certain extent, but was lower than that of fresh skin. After washing, the Ts of oil tanned pickled skin was equal to that of fresh skin. It meant oil or oxidized oil didn't display tanning property in the experiment mentioned in the essay. Treated with oil or oxidized oil, the Ts of...
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