▎ 摘　　要

NOVELTY - An external wall putty powder comprises filler, Portland cement, quartz sand, steel slag, montmorillonite, graphene oxide, polyethylene glycol-1000, water reducing agent and a surfactant. The water reducing agent is prepared by mixing dimethylaminoethyl methacrylate, acetone and tert-butyl catechol, heating to obtain mixture, adding 1,3-propanesultone and acetone to obtain mixed solution, mixing, filtering mixture, drying to obtain dried product, adding methallyl alcohol polyoxyethylene ether and deionized water, adding alpha -methylbenzene, deionized water, hydrogen peroxide, ascorbic acid and acrylic acid, cooling to room temperature and adjusting pH value. The surfactant is prepared by mixing dibenzyl selenide and tetrahydrofuran, adding sodium borohydride solution, brominated 2-undecyl-thiazolidine-4-carboxylic acid, suction-filtering, distilling filtrate, concentrating extract, taking upper layer extract and adding Tween-80 (RTM: Polysorbate-50) and dodecyl sulfobetaine. USE - External wall putty powder. ADVANTAGE - The external wall putty powder has improved pressure resistance and cracking resistance. DETAILED DESCRIPTION - An external wall putty powder comprises filler, Portland cement, quartz sand, steel slag, montmorillonite, graphene oxide, polyethylene glycol-1000, water reducing agent and a surfactant. The water reducing agent is prepared by mixing dimethylaminoethyl methacrylate, acetone and tert-butyl catechol in a mass ratio of 2-4:10-15:0.2-0.5, heating at 55-60 degrees C to obtain mixture, adding 1,3-propanesultone and acetone to obtain mixed solution, mixing at 55-60 degrees C, filtering mixture, drying to obtain dried product, adding methallyl alcohol polyoxyethylene ether and deionized water, stirring at 40-45 degrees C, adding 5-10 wt.% alpha -methylbenzene, deionized water and 1-3 wt.% hydrogen peroxide, stirring to obtain mixture, adding 8-12 pts. wt. ascorbic acid and 6-9 pts. wt. acrylic acid, stirring at 45-50 degrees C, cooling to room temperature and adjusting pH value to 6-7. The surfactant is prepared by mixing dibenzyl selenide and tetrahydrofuran in a mass ratio of 1:10-15, adding sodium borohydride solution, stirring, mixing, adding brominated 2-undecyl-thiazolidine-4-carboxylic acid, stirring, mixing at 45-50 degrees C, suction-filtering, distilling filtrate under reduced pressure, adjusting pH value to 1-2, distilling under vacuum conditions, concentrating extract, taking upper layer extract, evaporating in rotary evaporator and adding Tween-80 (RTM: Polysorbate-50) and dodecyl sulfobetaine. An INDEPENDENT CLAIM is included for preparation of exterior wall putty powder, which involves mixing 40-50 pts. wt. filler, 100-150 pts. wt. Portland cement, 20-30 pts. wt. quartz sand, 15-20 pts. wt. steel slag, 40-50 pts. wt. montmorillonite, 25-30 pts. wt. polyethylene glycol-1000, 10-15 pts. wt. graphene oxide, 20-30 pts. wt. water reducing agent, 50-70 pts. wt. surfactant and 60-90 pts. wt. water, heating at 50-60 degrees C for 1-2 hours, cooling to room temperature and drying.