| Either spinning regenerated protein fiber by the waste protein from agricultural and industrial waste or obtaining a new chemical fiber spun by waste protein, other natural or synthetic polymer provides a broad space for waste protein recycle.The annual output of corn starch is about 280 million tons in china. Maize paste is the main waste of corn starch production, which contains approximately 60% corn protein, including mainly zein (68%), grain protein (22%), and the ball protein (1.2%). How to use these proteins properly is an in-depth developing issue for maize paste.In this paper, Decoloration technology of maize paste was studied, and its application in the spinning of composed protein fiber was also discussed.Firstly, various agents were chosen to decolorize the maize paste and then selected H2O2 as oxidative bleaching agent and thiourea dioxide as reductive bleaching agent. Secondly, the affection of react concentration c, time t, temperature T and pH value on the bleaching effect were discussed. Through the orthogonal experiment, optimum decoloration process of H2O2 was as follows: concentration c 70g/L, pH value 8, 70℃, 60min; and the optimum decoloration process of thiourea dioxide was as follows: concentration c 30g/L, pH value 8, 70℃, 45min. As can be seen from the infrared spectra, there was no significant change in the protein before and after bleaching process.The maize paste after bleaching can meet the spinning requirement of protein composite fiber, and its decoloration rate could reach more than 39% and the whiteness of composite fiber which was spun by bleached maize paste was improved markedly,Except above, the properties of composite fiber with maize paste was also studied and compared with single component fiber, the breaking strength and breaking elongation of former fiber were slightly lower than that of latter one. Also, the dyeing performance of former is better, and the total dye uptake increased by about 20%.
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