▎ 摘　　要

NOVELTY - Preparing natural graphene cellulose blended fiber, comprises e.g. (a) combining a graphite powder with a solution comprising 1-10 wt.% of a first compound comprising sulfuric acid, hydrochloric acid, perchloric acid, hydrogen iodide, hydrofluoric acid or nitric acid, then stirring for 30 minutes in an ice bath environment, (b) adding a solution comprising 1-10 wt.% potassium permanganate to the product of step (a), stirring for 1-2 hours, and adding distilled water, and (c) adding a solution comprising 1-10 wt.% hydrogen peroxide. USE - The method is useful for preparing natural graphene cellulose blended fiber. ADVANTAGE - The method: provides the natural graphene cellulose blended fibers which have a strength of 3-5 g/d, an elongation of 4-8% and a Young's modulus of 50-150 g/d (claimed); does not require a reduction process, or use of the highly toxic hydrazine hydrate solution which is generally required in a reduction process, thus avoiding the health hazards associated with hydrazine hydrate solutions, increases the adding ratio of the graphene solution in the manufacturing process, achieves control of the antistatic properties and thermal transferring functions; satisfies the various requirements of different consumers; and decomposes the fibers naturally after being used, and thus the product is harmless, natural and environmentally friendly. DETAILED DESCRIPTION - Preparing natural graphene cellulose blended fiber, comprises (a) combining a graphite powder with a solution comprising 1-10 wt.% of a first compound comprising sulfuric acid, hydrochloric acid, perchloric acid, hydrogen iodide, hydrofluoric acid and nitric acid, then stirring for 30 minutes in an ice bath environment, (b) adding a solution comprising 1-10 wt.% potassium permanganate to the product of step (a), stirring for 1-2 hours, and adding distilled water, where the potassium permanganate solution is added until none of the purple smoke generated by reacting with the potassium permanganate is formed from the distilled water, (c) adding a solution comprising 1-10 wt.% hydrogen peroxide to the product of step (b), where the hydrogen peroxide solution is added until no bubbles are formed and the solution becomes dark green, then filtering the dark green solution into a cake, (d) rinsing the cake of step (c) with a solution comprising 5-10 wt.% hydrochloric acid to remove sulfate ions, then washing the cake with distilled water, (e) drying the product of step (d) at 40-60 degrees C for 24-48 hours to obtain dried solid graphite oxide, (f) adding distilled water to the dried solid graphite oxide of step (e), where the distilled water is added up to 200 mls per 0.06-1 g of the dried solid graphite oxide, then treating by ultrasonic vibration for 30-60 minutes to obtain a graphite oxide solution having a graphite oxide concentration of 0.03-0.5 wt.%, (g) adding a solution comprising 1-10 wt.% of a second compound comprising sodium borohydride, potassium borohydride, lithium aluminum hydride or sodium citrate to the graphite oxide solution of step (f), then treating by ultrasonic vibration for 30-60 minutes, (h) filtrating the product of step (g), washing the filtrate with water 3-5 times to remove the sodium borohydride, potassium borohydride, lithium aluminum hydride or sodium citrate, then back-filtrating to obtain a graphene solution, (i) adding the graphene solution of step (h) to a slurry solution formed by mixing a pulp with N-methylmorpholine N-oxide (NMMO) and a stabilizer in an expansion dissolving tank, then mixing at 60-80 degrees C, where the graphene solution is added in a ratio of 0.11-5 wt.%, the pulp is wood pulp, cotton pulp, bamboo pulp or a mixture of cotton and bamboo pulp, the pulp comprises alpha -cellulose present at greater than or equal to 65% having a polymerization degree of 500-1500, and the NMMO has a concentration of 50-78%, (j) removing water from the product of step (i) using a thin film evaporator (TFE) and heating at 80-130 degrees C, where the water is removed to 5-13% within 5 minutes and the cellulose is dissolved to form a spinning dope, (k) spinning the spinning dope of step (j) using a dry-jet wet spinning method, which comprises pressuring the spinning dope by a metering pump, filtering and degassing by a continuous filter (CPF), transporting the spinning dope into a spinning tank, forming a thin molten stream of the spinning dope by passing the spinning dope through a spinning orifice, then extruding the spinning dope through an air gap to form air-cured fibers, (l) delivering the air-cured fibers of step (k) into a coagulation bath, then regenerating and washing the fibers, where the coagulation bath has a concentration of 4.5-8%, and the amount of residual NMMO solvent remains after washing is less than 0.1%, and (m) drying, oiling and winding the product of step (l) to form natural graphene cellulose blended fibers.