Modification and Characterization of Leather Superfine Powder

Stable leather superfine powder suspension was got by superfine powder of leather solid wastes, maleic anhydride(MAH) and acrylic acid(AA). The best MAH、AA modifying conditions with grafting ratio as index were discussed by orthogonal test according L9(34) factor levels, and the results show that modified productsⅠis got by the total amount of MAH account for 50% of the amount weight of leather superfine powder at 80°C for 3 hours in the solution of N,N-dimethyl formamide (DMF). The MAH modified products was filtered and washed with water to reserve, and then was further modified by AA and MA being designed orthogonal test according L9(34)factor levels for optimum conditions with grafting ratio as index. The best modification conditions were as follows: ammonium persulfate(APS) as the initiator, the mass of initiator accounted for 2% of total weight of monomers , the volume ratio of AA and MA was 5, and the reaction temperature was 90 °C for 3 hours in 12% aqueous solution. The monomer grafting percentage of the products was 37.8%. The product was characterized by infrared spectroscopy (IR) and Size analyzer.