Study on the application of macro-porous carrier / polyamine composite materials in selective filtration of aldehydes in cigarette mainstream smoke
The distribution of vapor phase aldehydes in the whole mainstream smoke was demonstrated by HPLC. It indicates that the distribution of aldehydes in vapor phase of smoke was related to aldehyde's chemical reactivity. Formaldehyde, acrolein and crotonaldehyde had higher chemical reactivity and existed in particulate phase at a greater proportion. Some modified porous carriers were screened. Macro-porous silica gel modified by MCA (Melamine derivative), PEI (Polyethyleneimine), Ammonium Polyphosphate with high polymerisation degree, have good filtration performance for formaldehyde, acrolein and crotonaldehyde in smoke. The results showed that amounts of formaldehyde, acrolein and crotonaldehyde released in smoke might be reduced by 30%, 25%, and 15%, respectively. Surface of macro porous silica gel was modified by A-172 (Vinyl tris-(2-methoxyethoxy)silane), KH570 (?-methacryloxypropyltrimethoxysilane), coupling agent with carbon-carbon double bond, then macro-porous silica gel/polyamine were prepared, in which surface of carrier was modified by in situ polymerization with functional monomer of carbon-carbon double bond. These materials had good selective filtration behavior, the result showed the amount of formaldehyde, acrolein and crotonaldehyde in cigarette smoke release could be reduced by 40%, 20%, 20%, respectively.