▎ 摘　　要

NOVELTY - Anti-aging polyurethane coating comprises 30-50 pts. wt. isophorone diisocyanate, 20-30 pts. wt. polypropylene glycol-1000, 15-20 pts. wt. 1,4-butanediol, 8-10 pts. wt. dimethylolpropionic acid, 3-5 pts. wt. 2-amino-4-hydroxy-6-methylpyrimidine, 10-15 pts. wt. graphene oxide, 3-5 pts. wt. silane coupling agent, 1-3 pts. wt. carboxymethyl cellulose, 3-5 pts. wt. nano alumina, 2-5 pts. wt. nano titanium dioxide, 10-20 pts. wt. filler, 5-10 pts. wt. thickener, 3-5 pts. wt. leveling agent, 2-5 pts. wt. defoamer, 2-5 pts. wt. dispersant, 1-2 pts. wt. antioxidant and 60-80 pts. wt. water. USE - Anti-aging polyurethane coating used in polyurethane coating production device (claimed). ADVANTAGE - The anti-aging polyurethane coating helps in improving aging resistance of waterborne polyurethane paint by adding organic and inorganic modifiers to paint, and at same time, polyurethane paint production device enables to transport slurry from lower layer of reactor to top of grinding plate to flow out through return pipe. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing anti-aging polyurethane coating, which involves using isophorone diisocyanate, and polypropylene glycol-1000 as raw materials, 1,4-butanediol (BDO), and dimethylolpropionic acid as hydrophilic chain extenders, waterborne polyurethane emulsions, which are prepared by acetone self-emulsification method; using 2-amino-4-hydroxy-6-methylpyrimidine as modifier, MIS modified by activating carboxyl group with 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride graphene oxide dispersion liquid; adding prepared water-based polyurethane emulsion, and MIS modified graphene oxide dispersion with other raw materials into reactor, heating, stirring, and mixing uniformly to obtain anti-aging polyurethane coating; and (2) a polyurethane coating production device, which includes jacket, which is fixedly installed on lower side of outer wall of reaction kettle, and oil bath cavity provided inside jacket; oil inlet, and oil outlet are respectively fixedly installed on sides, supporting leg, which is fixedly installed at bottom of jacket; grinding plate arranged inside reaction kettle; grinding plate fixedly connected with inner wall of reaction kettle; grinding plate fixedly installed with return pipe in middle, and rotating shaft penetrates through return pipe; upper end of rotating shaft penetrates reactor; upper end of rotating shaft connected with output shaft of first motor, and lower end of rotating shaft fixedly installed with stirring rack; grinding mechanism fixedly installed on surface of rotating shaft above return pipe; both sides of top of reactor are provided with feed port, and liquid inlet; and liquid outlet, which is provided in middle of bottom of reaction kettle. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of overall structure of polyurethane coating production device. Reaction kettle (1) Jacket (2) Oil outlet (5) Supporting leg (6) First motor (10)