Study on Performance of Digital Printing Waste Paper Fiber-reinforced PLA Composite Films
Waste paper fiber/PLA composite films were prepared from digital printing waste paper and polylactic acid(PLA)by melt blend-ing and hot press molding.The effects of different waste paper fiber additions and different modifiers on the performance of composite films were investigated by adding silane coupling agents,including γ-glycidyl ether oxypropyltrimethoxysilane(KH560),vinyltrimethoxysilane(A171),isopropyltris(dioctylpyrophosphoryloxy)titanate(TMC201)andxylanase,respectively.The mechanical properties,opacity,chem-ical structure and thermal stability of composite films before and after modification were investigated.The results showed that the tensile strength of the composite films was the best when the mass fraction of waste paper fiber was 25％,reaching 21.6 MPa,which was 94.7％high-er than that of the pure PLA film.The opacity of the waste paper fiber increased to 95.5％when the mass fraction of waste paper fiber was 20％.Moreover,the tensile strengths of the composite films were all improved to different degrees after the modified treatment of the waste paper fiber,among which the modification of KH560 was the best,with the tensile strength of the composite films(the mass fraction of waste paper fiber of 25％)reaching 24.7 MPa,an increase of 14.4％compared to the non-modified composite films.The modified treatment did not affect the opacity and thermal stability of the composite films.
digital printing waste paperPLAcomposite filmsmechanical propertiesthermal stability
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