Complex Properties Of Black Wattle Extract Oxidizing Modified Products Reacting With Metal Ions And Their Tanning Properties

With the determination of pH and precipitate in complex reaction of Black Wattle Extract oxidizing modified products and metal ions ,and IR and paper chromatography analysis of the complex products, the degree and results of complex reaction have been explained in detail. Comparing the complex properties and abilities between the oxidizing modified products and its original Extract ,provide basis for the combination tannage with metal ions. In the experiments of oxidizing modified products -Cr(Al) combination tannage , changing the quantity and process, we put forward a best plan of moderate degraded product Perwat-30-Cr(Al) combination tannage. The leather shade is light, grain is smooth, and the body is flexible, meanwhile the quantity of Cr and Al has been decreased, especially for Cr reduced by half. The physical properties of leather accord with the professional standard . The results show that oxidizing modified products are fit for the type of light leather and face leather, moreover it can be used in the development of "No-Chrome,Less-Chrome" tanning agent and the practice of clean leather process.The new functional group of carboxyl group has been introduced with the decrease of molecular weight, and the content has been determined by using the conductivity titration method . the higher the oxidizing degree of products ,the more the content. The introduction of carboxyl group matter much in complex with metal ions and combination with collagen fibrils .A new method in determination of chrome content in chrome tanning waste water full of plantextract has also been raised.It can be used in study of plant chrome combination tannage and manufacture control.The thesis make a basis for the practice of oxidizing modified products in leather industry, especially for the combination tannage system with metal ions .