Abstract:

In order to solve the problem of the damage to fibers due to over oxidation during oxidation degumming process of ramie, 1, 8-dihydroxyanthraquinone (anthraquinone) as degumming additive for protecting cellulose and hemicellulose was added in alkali hydroxyl peroxide degumming solution. The physical and chemical properties (tensile properties, degree of polymerization, hemicellulose contents and yield) of fiber can be adjusted by controlling the dosage of 1, 8-dihydroxyanthraquinone. Results show that the hemicellulose contents and yield increase with the increasing of 1, 8-dihydroxyanthraquinone dosage, and the tensile properties of fiber first show an upward trend and then a downward trend with the increasing of 1, 8-dihydroxyanthraquinone dosage. With the optimal dosage (2 %) of 1, 8-dihydroxyanthraquinone dosage, the content of hemicellulose, the yield of degumming process, polymerization degree and the work of rupture of the degummed fiber improved by 17.3%, 7%, 2% and 41%, respectively. In addition, the COD value of the degumming wastewater decreased by 40%, indicating the relatively eco-friendly oxidation degumming process.

Key words: ramie, oxidation degumming, 1, 8-dihydroxyanthraquinone, hemicellulose, cellulose, tensile property, yield