Research on Preparation and Properties of Composite Antioxidant/LDPE Film
Composite antioxidant was added to low density polyethylene resin(LDPE),the antioxidant film was prepared by extrusion blow molding,and its properties were studied.Two types of antioxidants were selected:2,6-di-tert-butyl-4-methylphenol(BHT)mixed butyl hydroxyanisole(BHA)and 2,6-di-tert-butyl-4-methylphenol(BHT)mixed butyl hydroxyanisole(BHA)mixed with tartaric acid(TA).Three kinds of films including LBB(LDPE+0.5%BHA+0.5%BHT),LBBT(LDPE+0.5%BHA+0.5%BHT+0.5%TA)and L(LDPE)were prepared,and the mechanical,optical,moisture permeability,scanning electron microscope analysis and oxidation resistance of the films were analyzed.The results showed that the antioxidant composed of BHA,BHT and TA had good compatibility with LDPE film,increased the mechanical strength of the film,and decreased the water vapor transmittance.The scavenging rate of DPPH free radicals also showed that the films with BHA,BHT and TA added at the same time had better antioxidant properties than other films.
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