Photochromic resin lens with refractivity of 1.50 and preparation method thereof

A photochromic resin lens with a refractive index of 1.50, comprising a resin monomer, a photochromic organic material, an initiator, an antioxidant and a photo stabilizer at a weight ratio of 100:0.01-0.1:1-10:0.1-0.9:0.1-0.9, wherein the resin monomer is a mixture of a monofunctional acrylate, a difunctional acrylate and a tetrafunctional acrylate at a weight ratio of 10-80:10-50:10-50, the monofunctional acrylate has a refractivity Nd of 1.42 or less, and the difunctional acrylate and tetrafunctional acrylate have a refractivity Nd of 1.48 or less, the initiator is azobisisobutyronitrile or azobisisoheptonitrile;

• wherein the photochromic resin lens with the refractive index of 1.50 has Abbe number of 58;
• wherein the photochromic resin lens is prepared by the following steps:
• i) mixing the resin monomer, the photochromic organic material, the initiator, the antioxidant, and the photo stabilizer to obtaining a mixture;
• ii) pouring the mixture into a glass mold through a filter, and sealing;
• iii) setting the glass mold at temperature of 30-35° C., heating up to 35-40° C. over 1 hour, heating up to 40-45ºC over 1 hour and holding for 6 hours, and heating up to 50-55ºC over 6.5 hours and holding for 1 hour, then heating up to 85-95° C. over 2.5 hours and holding for 2 hours, and finally cooling down to 70-50° C. over 1 hour;
• iv) releasing the mixture from the glass mold, edging, and washing;
• and
• v) heating the mixture at 100° C. for 2 hours, cooling down to room temperature and obtaining the photochromic resin lens.