Abstract:

ing at the problem of poor mechanical properties of photosensitive resin after 3D printing, the method using polyester filament to reinforce photosensitive resin was adopted to fabricate polyester reinforced composite material by composite molding of polyester filament and photosensitive resin using stereo lithography appearance equipment. In order to obtain better reinforcement effect, the polyester fiber was treated with alkali. The relationship between the alkali reduction ratio of polyester and the morphology and mechanical properties of the polyester under various alkali treatment conditions was analyzed, and its influence on the mechanical properties of the composite was measured. The results show that the morphology and mechanical properties of the fiber change more obviously with the increase of alkali reduction ratio. When the polyester alkali reduction ratio is 16.2%, continuous longitudinal gully appears on the fiber surface, and the fiber mechanical strength decreases by 6%, and the fiber reinforcing effect is the best. The tensile strength and flexural strength of the modified polyester fiber reinforced composites reach 78 MPa and 471 MPa, respectively, and the tensile strength and flexural strength increase by 66% and 336%, compared with the untreated fiber reinforced composite, respectively.

Key words: polyester fiber, photosensiltive resin, 3D printing, composite material, alkali treatment, tensile strength, flexural strength