Prepare composite materials with recycled fibers from waste newspaper and PLA by inject-molding process, and study on recycled fiber of the modified-property treatment of silane coupling agent and alkali deinking treatment influence properties of composite materials. It is found out that, recycled fibers under the modified-property treatment of silane coupling agent and under alkali deinking treatment can effectively improve compatibility between recycled fibers and PLA, and improve mechanical properties and water absorbency of composite materials.

In the research, old newspaper recycling fiber-reinforced polylactic acid composites were produced by using injection molding technology. The influences of MAPP coupling agent and newspaper alkali deinking treatment on the performance of composite materials were studied. The results showed: MAPP can effectively improve the compatibility of old newspaper recycling fibers and PLA and increase the mechanical properties of composites; the alkali deinking treatment can effective improve the adhesion of newspaper recycling fibers and PLA and increase the mechanical properties of composites.