| Film made by blending polyvinyl butyral(PVB)with appropriate amount ofplasticizer,light and heat stabilizer and other additives,has the advantages of good impact resistance,adhesion,aging resistance and non-toxicity.It is widely used in automotive safety glass,photovoltaic packaging and high-rise building glass.In the production and use of related products in these fields,more and more residue of PVB films(r-PVB)are generated.The usual landfill or incineration treatment will cause environmental problem.It should bring both social and economic benefits if r-PVB could be recycled with high added value.The toughening effect of r-PVB on high-density polyethylene(HDPE)and polypropylene(PP)were investigated in this article.The influence of the types of compatibilizers and feeding sequence on the toughness of HDPE/r-PVB blends was studied,and the compatibilizer and process with excellent compatibilizing effect were selected.On this basis,HDPE ternary blends and PP ternary blends with excellent impact resistance were prepared.The effect of the ratio of r-PVB and compatibilizers on the micro-morphology,mechanical properties,rheological properties,and thermal properties of HDPE blends and PP blends were systematically explored.The main research contents and results are as follows:(1)HDPE/r-PVB blends compatibilized by addition of three kinds of maleic anhydride grafted polymer were prepared by one-step method and masterbatch method,respectively,using a torque rheometer and compression molding process.The results showed that HDPE/r-PVB/POE-g-MA blend prepared by one-step method using ethylene-octene copolymer grafted maleic anhydride(POE-g-MA)as compatibilizer had the highest notched impact strength.(2)According to the above-mentioned preferred method and compatibilizer,the HDPE/r-PVB/POE-g-MA blends with high toughness were prepared.The amount of dispersed phase for the ternary blends was kept fixed at 30 wt%.The influence of the mass ratio of r-PVB and POE-g-MA in the dispersed phase on phase morphology,thermal properties,mechanical properties and rheological behavior of HDPE/r-PVB/POE-g-MA blends was systematically studied.It was found that POE-g-MA could efficiently improve the compatibility between HDPE and r-PVB and increase the interfacial adhesion between them.When HDPE/r-PVB/POE-g-MA was 70/25/5,the maximum impact strength(52.4 k J/m~2)was achieved for the blend,which was 8.7times higher than that of pure HDPE.However,the tensile strength of the blend was significantly reduced.The crystallinity of HDPE was inhibited in the ternary blends but did not change too much with POE-g-MA and r-PVB content.The mass ratio of r-PVB to POE-g-MA was fixed at 25/5,and the HDPE/r-PVB/POE-g-MA blends with different dispersed phase content were prepared.The influence of the content of the dispersed phase on the morphology and performance of the blends was studied.When the content of the dispersed phase exceeded 25 wt%,the size of the dispersed phase in the blend was significantly reduced,and HDPE/r-PVB/POE-g-MA blends underwent an obvious brittle-tough transition.(3)HDPE/r-PVB/POE-g-MA blend with a mass ratio of 70/25/5 was prepared by melt blending using twin-screw and injection molding process,and its impact strength reached 60 k J/m~2.And the tensile strength and elongation at break of the blend were close to pure HDPE.(4)The amount of dispersed phase for the ternary blends was kept fixed at 30 wt%,and the PP/r-PVB/POE-g-MA blends were prepared by melt blending using twin-screw and injection molding process.The influence of the mass ratio of r-PVB and POE-g-MA in the dispersed phase on phase morphology,thermal properties,mechanical properties and rheological behavior of PP/r-PVB/POE-g-MA blends was systematically studied.It was found that when the mass ratio of PP/r-PVB/POE-g-MA was 70/10/20,the impact strength of the blend was 78.0 k J/m~2,which was 16.6 times higher than that of pure PP.The core-shell structure was formed in the blend,which was conducive to improving the toughness of the blend. |
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