▎ 摘　　要

NOVELTY - Mining pipe comprises 50-70 pts. wt. polyvinyl chloride, 10-15 pts. wt. hexahydrophthalic acid diglycidyl ester, 18-26 pts. wt. graphene, 11-18 pts. wt. sub-white corundum powder, 4-7 pts. wt. glyceryl tristearate, 10-15 pts. wt. basic magnesium sulfate whiskers, 9-14 pts. wt. bis(2-ethylhexyl) phthalate, 12-19 pts. wt. powder silica gel, 5-8 pts. wt. montan wax, 24-37 pts. wt. montmorillonite, 2-4 pts. wt. aluminum stearate, 1-3 pts. wt. magnesium stearate and 16-23 pts. wt. white jade powder. USE - Used as mining pipe. ADVANTAGE - The pipe has high strength and high toughness (claimed). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparation of mining pipe comprising (i) adding montmorillonite into 95% absolute ethanol in a solid-liquid ratio of 1:10-20, stirring, and then adding 3-6 wt.% N-( beta -aminoethyl)- gamma -aminopropylmethyldimethoxysilane of the amount of montmorillonite, heating oil bath at 65-70 degrees C, stirring for 1.5-2 hours, cooling to room temperature, washing with ethanol and deionized water for three times, freeze-drying, crushed to nano-particle size and sieving to obtain aminated nanocrystalline montmorillonite, (ii) mixing graphene oxide with water and stirring to obtain 0.6-1.2 mg/ml oxidized graphene dispersion, and then adding 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride equivalent to 46-52% by weight of graphene oxide and 42-48% N-hydroxysuccinimide, treating for 20-30 minutes, then adding aminated nanocrystalline montmorillonite prepared in step (i), stirring at speed of 600-900 revolutions per for 3-6 hours, filtrating, and washing with methanol and deionized water for 3 times, freeze-drying, calcining 730-770 degrees C for 0.5-1.5 hours and cooling to room temperature to obtain oxide graphene coated nano-montmorillonite, (iii) adding graphene-coated nano-montmorillonite obtained in step (ii) to water at a solid-liquid ratio of 1:21-29, adding sodium dodecyl sulfate equivalent to 2.5-4.5% of the graphene-coated nano-montmorillonite, carrying out ultrasonic dispersion for 1.5-2.5 hours, then water bath heating, heating at 75-80 degrees C in presence of nitrogen gas, heating at 80-85 degrees C, adding ammonium bisulfate equivalent to 0.6-0.7% of the graphene-coated nano-montmorillonite, then heating at 85-90 degrees C, adding 48-54% graphene-coated nano-montmorillonite butyl acrylate, stirring the reaction for 2-5 hours, filtering, washing, drying and airflow crushing to obtain polybutyl acrylate graft modified graphene coated nano montmorillonite, (iv) adding polyvinyl chloride, basic magnesium sulfate whiskers, hexahydrophthalic acid diglycidyl ester, aluminum stearate into a high speed heating mixer, heating at 65-85 degrees C, mixing for 14-22 minutes, then adding sub-white corundum powder, powder silica gel, montan wax, bis(2-ethylhexyl) phthalate, heating to 75-95 degrees C, mixing for 12-19 minutes, dropping the expected temperature to 60-80 degrees C by adding poly(butyl acrylate)grafted modified graphene coated nano-montmorillonite obtained in step (iii) and the rest of the raw materials, mixing for 8-16 minutes to obtain mixture, and (v) adding the mixture prepared in step (iv) into a twin-screw extruder, twin screw extruder barrel temperature of 175-195 degrees C, where die temperature is 165-185 degrees C, screw speed of 30-60 revolutions per minute, and then pulling, cooling and cutting to obtain final product.