| 摘要 |
PURPOSE: A method for preparing the master batch of a photochromic resin product is provided to allow a photochromic compound to be mixed with a resin uniformly and easily, thereby obtaining a stable photochromic resin product. CONSTITUTION: The method comprises the steps of mixing 30-50 parts by weight of methylethyl ketone, 10-20 parts by weight of toluene, 10-20 parts by weight of xylene, 5-10 parts by weight of ethyl acetate, 5-10 parts by weight of isopropyl alcohol, 0.001-5 parts by weight of perfume and 0.1-20 parts by weight of a photochromic compound; adding 50-100 parts by weight of a resin to the mixture to dip it for 1-24 hours; stirring the mixture uniformly; drying the mixture to remove solvents; pulverizing the dried one; heating and rapidly cooling the pulverized one. Preferably the heating is carried out in an injection extruder or a compression extruder at 100-200 deg.C, and the rapid cooling is carried out at the temperature below 40 deg.C.
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