▎ 摘　　要

NOVELTY - A graphene oxide composite lignin modified polycarboxylic acid high efficiency water reducing agent comprises 240-25 pts. wt. isopentenyl ether, 25.2-26.0 pts. wt. acrylic acid, 1.6-1.65 pts. wt. ammonium persulfate, 0.53-0.55 pt. wt. mercaptoacetic acid, 13-14 pts. wt. lignin, 10 wt.% sodium hydroxide solution, deionized water, 26-28 pts. wt. graphene oxide, 20-23 pts. wt. slag, 5-7 pts. wt. sorbitol, 2-3 pts. wt. sodium nitrite, 2-3 pts. wt. dodecyl dimethyl benzyl ammonium chloride, 4-5 pts. wt. carbon black, and 3-4 pts. wt. microcrystalline wax. USE - Graphene oxide composite lignin modified polycarboxylic acid high efficiency water reducing agent. ADVANTAGE - The product reduces production cost, and improves concrete strength and dispersibility. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of graphene oxide composite lignin modified polycarboxylic acid high efficiency water reducing agent comprising: (A) adding graphene oxide with deionized water for 4-5 times, putting into ultrasonic oscillator, ultrasonically processing for 30-40 minutes, uniformly dispersing, water bath heating at 60-80 degrees C, adding lignin, and uniformly stirring and dispersing to form mixture; (B) adding isopentenyl ether with deionized water, stirring and heating at 60-70 degrees C, adding ammonium persulfate, dripping acrylic acid, mercaptoacetic acid and (A), controlling for 3-3.5 hours, continuously heat preserving for 60-90 minutes, adding 10 wt.% sodium hydroxide solution to neutralize, adjusting pH value to neutral, and controlling solid content to 40-45%; (C) dissolving sorbitol into deionized water for 2-2.5 times to form solution, crushing slag into small blocks, putting into ball mill, adding solution, discharging, ball milling for 60-90 minutes, placing into oven for drying at 90-100 degrees C, and crushing to obtain modified slag powder; and (D) heating microcrystalline wax to melt, adding carbon black, grinding for 30-40 minutes, adding dodecyl dimethyl benzyl ammonium chloride, uniformly dispersing at speed of 300 revolutions/minute (rpm), continuously adding modified slag powder and other residual components, continuously stirring and dispersing at speed of 1000-1200 rpm, stirring into stirring kettle at speed of 600-800 rpm, and uniformly mixing and dispersing.