▎ 摘　　要

NOVELTY - Manufacture of graphene oxide-modified polypropylene-based square corrugated pipe involves mixing the modified polypropylene, modified graphene oxide, and polypropylene as a carrier flame retardant masterbatch in a mixer to obtain a mixed material, heating the mixed material to melt, extruding molten material into square cavity of the mold, filling the molten liquid into the mold, and moving forward with the mold, cooling the mold, hardening the square cavity, opening the mold, and demolding, and completely hardening the formed square corrugated pipe by water-cooled shower. USE - Manufacture of graphene oxide-modified polypropylene-based square corrugated pipe (claimed). ADVANTAGE - The method enables manufacture of graphene oxide-modified polypropylene-based square corrugated pipe having excellent compression resistance, thermal conductivity, temperature resistance, oxidation resistance, self-bonding property, and corrosion resistance. DETAILED DESCRIPTION - Manufacture of graphene oxide-modified polypropylene-based square corrugated pipe involves (S1) preparing 88-90 pts. wt. polypropylene, 8-10 pts. wt. flame retardant masterbatch with polypropylene as carrier, 8-10 pts. wt. 2,3-epoxypropyltrimethylammonium chloride, 14-16 pts. wt. polypropylene-grafted maleic anhydride, 18-20 pts. wt. hexamethylene diamine, 9-10 pts. wt. epichlorohydrin, 0.4-0.6 pts. wt. tetrabutylammonium bromide, 0.6-0.8 pts. wt. dopamine hydrochloride, 0.6-0.8 pts. wt. tris(hydroxymethylaminomethane), 0.6-0.8 pts. wt. polyethyleneimine, 6.5-8 pts. wt. potassium persulfate, 6.5-8 pts. wt. phosphorus pentoxide, 260-280 pts. wt. saturated concentrated sulfuric acid, 25-30 pts. wt. potassium permanganate, 8-10 pts. wt. graphite powder, deionized water, hydrogen peroxide, 1 mol/L hydrochloric acid aqueous solution, and xylene, (S2) preparing graphene oxide by adjusting based on the Hummers method, using the obtained graphite powder adjusting concentration to 35-40 pts. wt. saturated concentrated sulfuric acid, phosphorus pentoxide, potassium persulfate, potassium permanganate, deionized water, hydrogen peroxide, and 1 mol/L hydrochloric acid aqueous solution, and (1) heating saturated concentrated sulfuric acid to 81-85 degrees C, adding potassium persulfate and phosphorus pentoxide under the condition of continuous heat preservation, and stirring for 3-5 minutes at a mechanical stirring rate of 100-120 rpm to obtain a mixed solution, (2) adding graphite powder into the mixed solution, maintaining the stirring rate and warming for 3.5-4 hours to obtain the pre-reaction solution, (3) stop stirring and heat preserving, after naturally cooling the pre-reaction solution to room temperature, injecting 1800-2000 pts. wt. deionized water into the pre-reaction solution, stirring again and leaving still for 1.5-2 days, filtering out the solid content, (4) after rinsing the filtered solid content with deionized water to a pH of 6.5-7.5, naturally drying the solid content to obtain the preformed product (p1), (5) mixing remaining saturated concentrated sulfuric acid and deionized water into a sulfuric acid aqueous solution at a mass ratio of 1:2, after cooling to room temperature in an ice bath to 0-5 degrees C, adding product (p1) and potassium permanganate into the sulfuric acid aqueous solution, stirring for 130-150 minutes at a mechanical stirring rate of 100-120 rpm, heating the solution at 38-40 degrees C for 90-100 minutes to obtain an intermediate reaction solution, and (6) adding 1400-1500 pts. wt. deionized water and hydrogen peroxide to the intermediate reaction solution to obtain final reaction solution, modifying graphene oxide by (1') feeding 2,3-epoxypropyltrimethylammonium chloride into the graphene oxide solution, and dispersing for 40-50 minutes with ultrasonic power of 120-150 W, ultrasonic frequency of 30-35 kHz, and stirring at a rate of 40-60 rpm until flocs are no longer produced, rinsing the precipitated flocs with deionized water and drying to obtain reactant (B), (2') after mixing the hexamethylene diamine, epichlorohydrin and 100-120 pts. wt. deionized water, leaving still at room temperature for 7-8 hours, increasing the temperature to 68-75 degrees C, refluxing for 50-55 minutes, dehydrating and drying the obtained material to obtain reactant (C), (3') mixing polypropylene-grafted maleic anhydride and 2,3-epoxypropyltrimethylammonium chloride, pouring into xylene, warming up to 135-140 degrees C, refluxing for 6-6.5 hours, adding ethanol, stirring for 8-10 minutes at a stirring rate of 40-60 rpm, and suction filtering and drying to obtain reactant (D), mixing tetrabutylammonium bromide, reactant (D), and pouring mixture into xylene, warming up to 135-140 degrees C, refluxing for 6-6.5 hours, filtering and drying to obtain reactant (E) which is the modified graphene oxide, (S4) modifying polypropylene by (S4-1) rinsing and drying the polypropylene with ethanol to obtain clean polypropylene, (S4-2) mixing the dopamine hydrochloride, polyethyleneimine and dissolving into 600-800 pts. wt. deionized water, and titrating with 1mol/L hydrochloric acid aqueous solution to pH of 8-8.5, to obtaining modified liquid, (S4-3) adding the clean polypropylene into the primary modification solution, stirring for 4.5-5 hours at a stirring rate of 40-60 rpm, and taking out the reacted polypropylene and washing with deionized water to pH of 6.5-7.5, drying naturally to obtain the modified polypropylene, (S5) mixing the modified polypropylene, modified graphene oxide, and polypropylene as a carrier flame retardant masterbatch in a mixer to obtain a mixed material, heating the mixed material to melt, extruding molten material into square cavity of the mold, filling the molten liquid into the mold, and moving forward with the mold, cooling the mold, hardening the square cavity, opening the mold, and demolding, and completely hardening the formed square corrugated pipe by water-cooled shower. An INDEPENDENT CLAIM is included for the graphene oxide modified-polypropylene-based square corrugated pipe, which comprises a component (A) comprising modified graphene oxide by using 2,3-epoxypropyltrimethylammonium chloride, hexamethylene diamine, epichlorohydrin, polypropylene-grafted with maleic anhydride and polarized modified graphene oxide, the graphene oxide specifically uses graphite powder, saturated concentrated sulfuric acid, phosphorus pentoxide, potassium persulfate, potassium permanganate, deionized water, hydrogen peroxide, 1mol/L concentration of hydrochloric acid aqueous solution, a component (B) comprising a modified polypropylene using dopamine hydrochloride, tris(hydroxymethyl)aminomethane, polyethyleneimine modified-polypropylene, and a component (C) comprising flame retardant masterbatch with polypropylene as carrier, in which the mass ratio of the components (A)to (C) is (0.7-1.5):(8-10):1.