▎ 摘　　要

NOVELTY - Preparation of composite building material involves preparing oxidized graphite with high oxidation degree, modifying with cetyltrimethylammonium bromide, preparing a MC nylon/modified graphene nanocomposite by in-situ polymerization using the resultant modified product, adding e.g. a nitrile rubber modified phenolic resin, methenamine, hexamethylenetetramine, amyl triethoxysilane, conductive mica powder, polyisocyanate trimer, polytetrafluoroethylene fibers, a nano active agent, a plasticizer, nano cerium oxide and an accelerant, mixing, extruding, sintering, and cooling. USE - Preparation of composite building material (claimed). ADVANTAGE - The method enables preparation of environmentally-friendly composite building material having excellent flame retardance, high-temperature resistance, mechanical property, comprehensive performance and low-expansion performance, by effective adsorption and removal of harmful gases and dust in exhaust gas. The molten resin used in preparation of the building material is rapidly transformed from linear structure into non-molten structure. DETAILED DESCRIPTION - Preparation of composite building material involves preparing oxidized graphite with high oxidation degree, modifying with cetyltrimethylammonium bromide, preparing a MC nylon/modified graphene nanocomposite by in-situ polymerization using the resultant modified product, adding a nitrile rubber modified phenolic resin, methenamine, a vacuum residue, a non-halogenated organic phosphinate, hexamethylenetetramine, amyl triethoxysilane, conductive mica powder, conductive nano-graphite powder, polyisocyanate trimer, polytetrafluoroethylene fibers, a nano active agent, a plasticizer, an antioxidant, nano cerium oxide and an accelerant, crushing, mixing, screening by 100-200 mesh sieve, stirring at 90-100 degrees C, obtaining a base material, extruding in a vacuum extruder at vacuum degree of 1-1.8 MPa and extrusion pressure of 15-20 MPa, drying, sintering at 700 degrees C for 15 days, placing obtained product in a casting machine, pressurizing, melting at 160-190 degrees C, heat-preserving for 3-5 hours, and naturally cooling. The composite building material contains 8-10 pts. wt. nitrile rubber modified phenolic resin, 15-20 pts. wt. methenamine, 5-10 pts. wt. vacuum residue, 5-7 pts. wt. non-halogenated organic phosphinate, 8-10 pts. wt. hexamethylenetetramine, 2-4 pts. wt. amyl triethoxysilane, 0.3-0.5 pt. wt. conductive mica powder, 0.2-0.4 pt. wt. conductive nano-graphite powder, 0.8-1 pt. wt. polyisocyanate trimer, 1-2 pts. wt. polytetrafluoroethylene fibers, 20-30 pts. wt. nano active agent, 2-8 pts. wt. plasticizer, 1-5 pts. wt. antioxidant, 6-14 pts. wt. nano cerium oxide and 2-6 pts. wt. accelerant.