▎ 摘　　要

NOVELTY - Preparation method of low formaldehyde emission polyoxymethylene, involves (a) dispersing the carboxylated carbon nanotubes (CNT) in a mixed solution of thionyl chloride and dimethylformamide, performing a reaction, and after reacting, removing the thionyl chloride and collecting the product, (b) dispersing the product in dehydrated dimethylformamide, adding an amine compound, and performing a grafting reaction in the presence of a catalyst to obtain CNT-grafted-carbide nitride (CNT-g-NC), (c) dispersing graphene oxide and CNT-g-NC in water, ultrasonically processing and aging to make graphene hydrogel, (d) making the graphene hydrogel into a graphene aerogel, and then reducing in a reducing atmosphere to obtain a reduced graphene aerogel, and (e) uniformly mixing the particles of the reduced graphene aerogel, the polyoxymethylene, and the additives, melting, kneading, extruding and granulating to obtain the polyoxymethylene with low formaldehyde emission. USE - The method is used for preparation of low formaldehyde emission polyoxymethylene which is used in the applications of electrical and electronic, automobile, light industry, machinery, chemical engineering and building materials (all claimed). ADVANTAGE - In the method, the formaldehyde absorbent amine compound of polyoxymethylene is loaded on the surface of carboxylated carbon nanotubes with a high grafting rate. The method utilizes porous reduced graphene aerogels so as to utilize graphene's excellent stabilizing effect, large specific surface area and strong adsorption capacity. The porous structure of the formed aerogel can increase its adsorption area and adsorption capacity for harmful gases such as formaldehyde. In the method, simultaneously the intercalated carboxylated carbon nanotubes play a supporting role on the graphene aerogel through self-assembly, which has a reinforcing effect, and the formaldehyde absorbent grafted on its surface is conducive to the absorption and removal of formaldehyde. The method produces polyoxymethylene with low formaldehyde emission.