CELLULOSE ESTER COMPLEX MATERIAL WITH IMPROVED STRENGTH UNDER WET CONDITION BY MODIFICATION OF TERMINAL GROUP OF AQUEOUS PLASTICIZER

摘要

The present invention relates to a cellulose ester complex material with an improved wet strength through the modification of a terminal group of a water-soluble plasticizer, and more specifically, to a cellulose ester complex material capable of maintaining plasticity and strength under a high humidity condition by preventing the water-soluble plasticizer from migrating to the surface of the cellulose ester material by modifying a hydrophilic terminal group of an eco-friendly plasticizer with a hydrophobic group. According to the present invention, the complex material comprising the cellulose ester and the modified plasticizer adopts polyalkylene glycol known as an eco-friendly plasticizer without using a phthalate based plasticizer, so as to allow an injection molding method as well as an existing melt extrusion method due to a reduced smoking effect, and to maintain the properties equivalent to or higher than the properties of a case in which an existing phthalate based plasticizer is used. Moreover, since a terminal group of polyalkylene glycol, which is the eco-friendly plasticizer, is modified by the hydrophobic group, the migration of the plasticizer in a final molded article is minimized while keeping a plasticizing performance of polyalkylene glycol, and thus the strength equivalent to that under a low humidity condition is kept under a high humidity environment. The composite material comprises 50 to 90 wt% of cellulose ester and 10 to 50 wt% of a hydrophobic polyalkylene glycol with respect to the total weight of the composite material.