▎ 摘　　要

NOVELTY - Production of high strength graphene nylon composite brick involves taking oxidized graphite; modifying with cetyltrimethylammonium bromide, and obtaining oxidized graphite by ultrasonic oxidation of graphene; preparing MC nylon/modified graphene nanocomposite by in-situ polymerization; adding e.g. gangue, conductive mica powder, polytetrafluoroethylene fiber, nano-active agent, plasticizer, antioxidant and nano-graphene, filtering, and mixing; extruding substrate; naturally drying and sintering; and mixing polylactic acid chitosan and nanographene, magnetic stirring, and loading graphene. USE - Method for preparing high strength graphene nylon composite brick (claimed) used for absorption of aerosol and volatile organics. ADVANTAGE - The method is simple, ensures high conversion rate and good comprehensive performance, and improves porosity and specific surface area of composite absorbing film. It can absorb point negatively charged bacteria. DETAILED DESCRIPTION - Production of high strength graphene nylon composite brick comprises taking oxidized graphite; modifying with cetyltrimethylammonium bromide (CTAB), and obtaining oxidized graphite by ultrasonic oxidation of graphene; preparing MC nylon/modified graphene nanocomposite by in-situ polymerization; adding gangue, conductive mica powder, nano-conductive graphite powder, polyisocyanate trimer, polytetrafluoroethylene fiber, nano-active agent, plasticizer, antioxidant, homemade modified hydrotalcite, attapulgite clay, nano-titanium dioxide, nano-cerium oxide and accelerator; pulverizing remaining heat stabilizer, binder, polylactic acid chitosan and nano-graphene, filtering over 100-200 mesh sieve, and mixing at 90-100 degrees C; extruding substrate by vacuum extruder at 1.0-1.8 MPa and 15-20 MPa; naturally drying for 15 days, and sintering at 700 degrees C; and mixing polylactic acid chitosan and nanometer graphene for 5-6 hours, magnetic stirring to form uniform and stable transparent solution, and loading graphene between high temperature spray layer and electrospray layer. The brick comprises 15-20 pts. wt. polylactic acid chitosan, 10-15 pts. wt. nanographene, 5-10 pts. wt. graphene, 30-35 pts. wt. coal gangue, 0.3-0.5 pt. wt. conductive mica powder, 0.8-1 pt. wt. trimer of polyisocyanate, 1-2 pts. wt. polytetrafluoroethylene fiber, 20-30 pts. wt. nano-active agent, 2-8 pts. wt. plasticizer, 2-6 pts. wt. homemade modified hydrotalcite, 10-18 pts. wt. attapulgite clay, 8-12 pts. wt. nanotitanium dioxide, 6-14 pts. wt. cerium oxide and 2-6 pts. wt. accelerator. The oxidized graphite is prepared by adding concentrated sulfuric acid to graphite, stirring at - 20 to 10 degrees C for 5-12 hours, stirring at 0-5 degrees C for 5-12 hours, adding potassium permanganate to obtain oxidized graphite solution, adding CTAB for flocculation, filtering, washing and drying at 50 degrees C for 24 hours.