| 摘要 |
PURPOSE: A method for preparing a polypropylene resin containing a photochromic compound, and polypropylene yarn and photochromic product using the polypropylene resin are provided to allow a photochromic compound to be mixed uniformly with a polypropylene resin. CONSTITUTION: The method comprises the steps of dissolving 0.5-3 g of a photochromic compound and a small quantity of a photostabilizer and an antioxidant to an organic solvent mixture comprising 50-200 g of methylene chloride, 100-200 g of ethylene glycol, 100-200 g of xylene, 200-500 g of toluene, 200-400 g of methylethylketone, 50-200 g of n-hexane and 0.1-5 g of an acid; adding 500-1,000 g of a polypropylene resin to the mixture and reacting them at 60-110 deg.C for 6-9 hours; and drying the obtained resin at 50-100 deg.C for 1-4 hours. Preferably the photochromic compound is a spiropyran-based compound.
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