Abstract:

This study focused on the formulation of slow-releasing chlorine dioxide preservative paper in order to provide
theoretical support for the development of wood fiber-based green packaging materials. Preservative coating was made by
mixing oxidized starch adhesive, NaOH and NaClO2. The preservative paper was made on the basis of paper taking NaClO2
as the precursor of ClO2. Slow-releasing ClO2 was then achieved by controlling tartaric acid content and interaction time.
Taking oxidized starch adhesive, NaOH, NaClO2 and tartaric acid concentration as the experimental factors, orthogonal
design was implemented to ascertain NaClO2 residual rate and ClO2 releasing pattern in the preservative system. The
experimental data were regressed with SPSS to reveal the influence of three coating ingredients on half life of NaClO2
residual rate, the maximum ClO2 releasing speed, the time needed to achieve maximum releasing speed and total amount of
released ClO2. Results showed that the optimum formulation of preservative coating consisted of 0.7 g of oxidized starch
adhesive per sheet, 15% NaClO2, 0.3 g of NaOH per sheet and 15% tartaric acid in B paper.

Key words: preservative paper, ClO2, NaClO2, preservative coating