Effect of Shale on the Reduction of VOCs Emission from Polypropylene Composites

  • Di Zhang,Guangping Sun, Xiqing Zhang


In this paper, the surface area, pore structure, adsorption curve, pore size and pore size distribution of natural porous materials-lightweight shale (LWS) and LWS-700-1h (700-degree calcined shale) were studied. As a new filler in polypropylene composites, LWS can effectively reduce the emission of small organic molecules. The small organic molecules emitted by the polypropylene composite are mainly methylcyclohexane and 2, 4-dimethyl-heptane. The adsorption capacity of LWS mainly depends on the micropores with pore size concentrated in the range of 0.4 nm -0.7nm, which can effectively reduce the emission of methyl cyclohexane and 2, 4-two methyl-heptane. When the LWS content was increased from 0% to 16%, the emissions of methylcyclohexane and 2,4-dimethyl-heptane were reduced by 54% and 38.9%, respectively. The effect of LWS-700-1h reducing the emission of organic small molecule gas is much lower than that of LWS, mainly due to the low number of micropores in the range of its 0.4 nm -0.7nm. LWS can be used as a filler for PP composites to reduce VOC emissions and as an environmentally friendly material for automotive interiors.