▎ 摘　　要

NOVELTY - Modified polycarboxylate water reducing agent comprises 240-250 pts. wt. isobutyl alcohol polyoxyethylene ether, 25.2-26.0 pts. wt. acrylic acid, 1.6-1.65 pts. wt. ammonium persulfate, 0.53-0.55 pts. wt. mercaptoacetic acid, 13-14 pts. wt. lignin, 10wt.% sodium hydroxide solution, 26-28 pts. wt. graphene oxide, 5-7 pts. wt. sugar factory waste liquid, 7-8 pts. wt. hydroxypropylmethyl cellulose, 2-3 pts. wt. polyacrylamide, 3-4 pts. wt. calcium chloride, 2-3 pts. wt. triethanolamine, 5-6 pts. wt. carbon black, 19-22 pts. wt. building brick slag, 1-1.2 pts. wt. silane coupling agent kh550. USE - Modified polycarboxylate water reducing agent. ADVANTAGE - The modified polycarboxylate water reducing agent improves flow of concrete, frost resistance, and improves anti-dispersion of product in water. DETAILED DESCRIPTION - Modified polycarboxylate water reducing agent comprises 240-250 pts. wt. isobutyl alcohol polyoxyethylene ether, 25.2-26.0 pts. wt. acrylic acid, 1.6-1.65 pts. wt. ammonium persulfate, 0.53-0.55 pts. wt. mercaptoacetic acid, 13-14 pts. wt. lignin, 10wt.% sodium hydroxide solution, 26-28 pts. wt. graphene oxide, 5-7 pts. wt. sugar factory waste liquid, 7-8 pts. wt. hydroxypropylmethyl cellulose, 2-3 pts. wt. polyacrylamide, 3-4 pts. wt. calcium chloride, 2-3 pts. wt. triethanolamine, 5-6 pts. wt. carbon black, 19-22 pts. wt. building brick slag, 1-1.2 pts. wt. silane coupling agent kh550, and proper amount of deionized water. An INDEPENDENT CLAIM is included for a method for preparing modified polycarboxylate water reducing agent, which involves: (A) subjecting oxidation of graphene by adding 4-5 times amount of deionized water, and subjected to ultrasonic oscillation in oscillator for 30-40 minutes to obtain graphene oxide dispersion, and heating graphene oxide dispersion in a water bath at 60-80 degrees C, and adding lignin, and mixing uniformly to form mixture; (B) adding isobutyl alcohol polyoxyethylene ether with proper amount of deionized water in reactor and stirring at 60-70 degrees C, and adding ammonium persulfate, acrylic acid, and mercaptoacetic acid, and adding obtained mixture dropwise into it for 3-3.5 hours, and heating it for 60-90 minutes, and adding sodium hydroxide solution to adjust its pH value to neutral, and has solid content of 40-45% to obtain neutralized material; (C) crushing neutralized material into small pieces of building block into ball mill for 20 minutes, and dissolving silane coupling agent kh550 in 2-3 times deionized water to form a solution, spraying in ball mill, and continue ball milling for 30-40 minutes, discharging, drying and grinding obtained ball milled material, and subjected to vacuum drying in an oven to obtain building block powder; (D) adding 3-3.5 times of deionized water to hydroxypropylmethyl cellulose, stirring to dissolve sufficiently, and adding polyacrylamide and sugar factory waste liquid and stirring at speed of 300 revolutions per minute for 20-30 minutes, adding calcium chloride, triethanolamine, building block powder and remaining material, and stirring at speed of 500-600 revolutions per minute to obtain uniformly dispersed material; and (E) mixing obtained product, placing in stirred tank, and stirring at speed of 600-800 revolutions per minute to obtain final product.