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