Research On The Blending Modification Of R-PP And R-ABS In The Home Appliances

In the first section of the article, oxidative degradation changes were studied of R-ABSand R-PP from waste electronic home appliances in their life. Then the R-ABS/R-PP/SEPblends and R-ABS/R-PP/SEPS blends were prepared by melt-blending in a twin screwextruder. at the same time, poly(styrene-b-ethylene-co-propylene) SEP and poly(styrene-b-isoprene-b-styrene) SEPS were used as compatibilizing agents. At last, theperformance of the prepared blends above is studyed and analyzed．The main contents are as follows:(1) Scanning electron microscope, infrared spectrometer and thermo gravimetricanalyzer were used to analyze the oxidative degradation changes of R-ABS and R-PP in theirlife. The results shows that ABS and PP in the actual process of using oxygen is easy tooxidized to form chain scission, resulting a certain degree of reduction in its mechanicalproperties.(2) In this paper, the different proportions of R-ABS/R-PP/SEP blends were prepared bymelt-blending in a twin screw extruder. Then the performance of theRich-R-PP(R-PP/R-ABS=80/20、70/30and60/40) and Rich-R-ABS(R-ABS/R-PP=80/20、70/30and60/40) blends was tested by mechanical properties and the melt index tester. Theresults show that, For Rich-R-PP and Rich-R-ABS blends, R-ABS/R-PP=70/30andR-ABS/R-PP=30/70have the best performance respectively.(3) R-ABS/R-PP=30/70blends were prepared, in which SEP and SEPS were thecompatibilizing agents. Then the performance of the R-ABS/R-PP blends was tested bymechanical properties, rheological properties, morphology and crystalline properties.The research on the rheological behavior show that, With the content of SEP and SEPSincreased, the balance torque of blend increased. when the content of SEP and SEPS was5phr,the balance torque reached maximum, then the system was on the saturated, balance torqueremained unchanged. The research on the mechanical properties show that, the impact strength of blends firstincreased then decreased as the addition of SEP and SEPS increased, meanwhile the rate ofincrease of SEPS was faster. Optimum impact strength could be achieved when SEPS contentis5phr, with impact strength being4.0kJ/m2,52%higher than that of unmodified blends.Furthermore, the tensile strength and flexural strength of the blend Rich-R-PP/SEPS is highthen Rich-R-PP/SEP. The tensile strength of blends first increased then decreased as theaddition of SEPS increased, Optimum tensile strength could be achieved when SEPS contentis5phr, with tensile strength being26.7MPa,30%higher than that ofR-PP/R-ABS/SEP=70/30/5blends. These show that, for the Rich-R-PP blending system, theinfluence of SEPS on the mechanical properties was better than that of SEP.The research on the morphology show that, the average particle size of the dispersedphase decreases as the addition of SEP and SEPS increased. R-ABS particles are spherical orellipsoidal, the particle size is smaller, and more uniform distribution when SEP content is5phr.The research on the crystallization behavior of Rich-R-PP/SEPS blends show that, thecrystalline properties of R-PP was inhibited by30%R-ABS, and SEPS had little effect on thecrystalline properties of R-ABS/R-PP/SEPS blends.(4) R-ABS/R-PP=70/30blends were prepared, in which SEP and SEPS were thecompatibilizing agents. Then the performance of the R-ABS/R-PP blends was tested bymechanical properties, rheological properties, morphology and crystalline properties.The research on the rheological behavior show that, With the content of SEP and SEPSincreased, the balance torque of blend increased. when the content of SEP and SEPS was7.5phr, the balance torque reached maximum, then the system was on the saturated, balancetorque remained unchanged.The research on the mechanical properties show that, the impact strength of blends firstincreased then decreased as the addition of SEP and SEPS increased, meanwhile the rate ofincrease of SEP was faster. Optimum impact strength could be achieved when SEP content is7.5phr, with impact strength being5.9kJ/m2,97%higher than that of unmodified blends,12%higher than that of R-ABS/R-PP/SEPS=70/30/7.5blends. However, the tensile strength andflexural strength of the blends Rich-R-ABS/SEPS is high then Rich-R-ABS/SEP. The tensilestrength of blends first increased then decreased as the addition of SEPS increased, Optimum tensile strength could be achieved when SEPS content is5phr, with tensile strength being24.7MPa,50%higher than that of Rich-R-ABS/SEP=70/30/5blends. These show that, for theRich-R-ABS blending system, the influence of SEPS on the mechanical properties was betterthan that of SEP.The research on the morphology of Rich-R-ABS/SEPS blends show that, R-PP remainsthe continuous phase. Blends was "bi-continuous phase" structure with no compatible agent,SEPS changed the morphology of blends from the original "bi-continuous phase" structure to"sea-island" structure. When SEPS content is7.5phr, the phase interface is very vague andthe cross section is not flat, even the R-ABS are more evenly distributed.The research on the crystallization behavior of Rich-R-ABS/SEPS blends show that, thecrystalline properties of R-PP was inhibited by70%R-ABS, and SEPS had little effect on thecrystalline properties of R-ABS/R-PP/SEPS blends.