▎ 摘　　要

NOVELTY - Preparing moisture absorbing, antibacterial and water vapor permeable graphene modified polyurethane synthetic leather comprises (i) preparing antibacterial agent, modified coco bran, carboxylated graphene sheet, spun-laced non-woven fabric having well-absorbent and breathable property synthetic leather is obtained by impregnating pure cotton spun lace nonwoven fabric, 5% formic acid aqueous solution and modified bran, placing in aqueous solution of 10% acetic acid, washing 4 times with mixed solution of ethanol and water, drying, dispersing modified cotton textile fiber, sodium alginate, chitosan, fatty alcohol polyoxyethylene ether in distilled water, mixing and stirring, immersing in o-methoxyaniline, and stirring polyurethane film-forming agent, pigment, antibacterial agent, substance A, water, carboxylated graphene sheet and t-butyl amine to obtain a slurry, coating evenly on the well-absorbed and breathable synthetic leather of step (iv), solidifying. USE - The method is useful for preparing moisture absorbing, antibacterial and water vapor permeable graphene modified polyurethane synthetic leather. ADVANTAGE - The leather has moisture absorbing property, antibacterial property and is water vapor permeable. DETAILED DESCRIPTION - Preparing moisture absorbing, antibacterial and water vapor permeable graphene modified polyurethane synthetic leather comprises (i) antibacterial agent is obtained by adding 10 g 5-hydroxytryptophan, 3-4 g hydrobromide and 2-3 g 2-bromo-2-nitro-1,3-propanol into the flask, stirring, reacting at 60 degrees C for 1-2 hours, adding 1-3 g 1,2,3,6-tetrahydro-2,6-dioxopyrimidine-4-carboxylic acid, stirring, reacting at 70 degrees C for 1-3 hours, adding 1-2g 2,3-pyrazinedicarboxylic acid, 1-2g metal salt, 15-30g water and 2-3 g substance B2, stirring, reacting at 65 degrees C for 2-3 hours, and drying under vacuum at 45 degrees C for 1 hours, (ii) modified coco bran is obtained by crushing 45 g husk to 1-2mm and adding into 15 g diethyl aluminum hypophosphite, 2.1 g diethylene triamine pentaacetic acid, adding 160ml deionized water, 5-7 g collagen hydrolysate, 1-5 g toughener and 1-2 g 2,2,6,6-tetramethyl-4-aminopiperidinamine, stirring, reacting at 75 degrees C for 1-2 hours, 1.8 g potassium hydrogen tartrate, 3.1 g diethylene triamine pentaacetic acid, reacting at 60 degrees C for 1 hour, adding 6.2 g sodium ethoxide, reacting at 70 degrees C for 1 hour, allowing to stand for 1.5 hours, and drying at 105 degrees C for 2 hours, (iii) carboxylated graphene sheet is obtained by adding 0.02 g graphene into 300 ml concentrated sulfuric acid, 0.3 g triphenylamine 4-borate and 0.2 g 3,4,5-trifluorobenzeneboronic acid, and reacting at 80 degrees C, the ultrasonic cleaner with ultrasonic power of 500W and frequency of 100 KHz, condensing and refluxing for 3 hours, diluting with 450 ml deionized water, filtering with a microporous membrane with a diameter 0.2 mu m, washing repeatedly with deionized water until neutral, baking at 80 degrees C for 8 hours, and grinding to fine powder, where the graphene is a graphene sheet produced by chemical vapor deposition, and has length 0.1-10 mu m, width 0.1-10 mu m, and thickness 1-10 nm, purity 99.5 wt.% and specific surface area 500~2600 m2/g, (iv) spun-laced non-woven fabric having well-absorbent and breathable property synthetic leather is obtained by impregnating 45 g pure cotton spun lace nonwoven fabric, in 70 g 5% formic acid aqueous solution and 4.1 g modified bran from step (ii) at 25 degrees C for 60 min, placing in a 70 g aqueous solution 10% acetic acid, taking out after 60 minutes, washing 4 times with 50 ml mixed solution ethanol and water in volume ratio of 80:20, and drying, dispersing modified cotton textile fiber, 0.6 g sodium alginate, 0.7 g chitosan, 0.4 g JFC (fatty alcohol polyoxyethylene ether) in 100 g distilled water, mixing and stirring at 60 degrees C for 40 minutes, immersing in 1.7 g o-methoxyaniline for 50min, impregnating 4 g 3,4-dihydroxyphenylacetic acid, 2.6g xanthan gum and 90 g water, reacting for 1 hour, drying at 100 degrees C for 5 minutes, washing 3 times with water and drying, and (v) stirring 12 g polyurethane film-forming agent, 1.6 g pigment, 0.7 g the step (i) antibacterial agent, 2.5 g the substance A, 50 g water, 0.5 g the carboxylated graphene sheet and 0.2-0.5 g t-butyl amine to obtain a slurry, coating evenly on the well-absorbed and breathable synthetic leather of step (iv), solidifying in a coagulation tank for 10 minutes at 25 degrees C, placing in a washing tank for washing, and washing, adding 100 g water, 0.01 g protease and 0.8 g dispersing agent, hydrolyzing at 40 degrees C for 30-60 minutes, placing in an oven, drying at 100 degrees C for 3 hours, cooling naturally to room temperature.