Photochromic lens

Abstract

The invention discloses a photochromic lens. The photochromic lens comprises a lens base material and a photochromic film; the photochromic film is formed by spin-coating a photochromic fluid on the lens base material, infrared heating and curing, and cooling; the photochromic film has a thickness of 15 microns; the photochromic fluid is prepared from the following raw materials in part by mass: ablue toner 8410, a green toner 8409, a red toner 8405, toluene, polytetramethylene ether glycol, an acrylic polymer, 2-mercaptoethyl sulfide, poly(methylene phenyl isocyanate), an isocyanate compound, a 1358 curing agent, a 306 flow agent, dibutyltin dilaurate, a BASF light stabilizer 144,a 1010 antioxidant and aluminum acetylacetonate. The transmission rate of the photochromic lens disclosed bythe invention for a wave length of 420-790 nm is 15.63-81.79%; the time required for changing light color to dark color is 3-4 s; the time required for changing dark color to light color is 3-4 s; andthe usage effect is obviously improved.

Description

technical field [0001] The invention relates to the technical field of lenses, in particular to a color-changing lens. Background technique [0002] The so-called photochromic lens is a lens that will become darker when exposed to light of a certain wavelength (usually ultraviolet light), and will return to the original light transmittance when it is no longer illuminated by this light source and become darker. Clear. Due to their unique properties, photochromic lenses are widely used in sunglasses, optical glasses, snow goggles, sports goggles and protective goggles. However, the existing photochromic lenses have the disadvantage of slow discoloration speed. Generally speaking, it takes about 20 seconds for the existing photochromic lenses to change from light color to dark color, and about 50 seconds to change from dark color to light color. Ideal, especially for use in some situations where the environment changes quickly, such as: when a vehicle driving on a highway en...

AI Technical Summary

Problems solved by technology

However, the existing photochromic lenses have the disadvantage of slow discoloration speed. Generally speaking, it takes about 20 seconds for the existing photochromic lenses to change from light color to dark color, and about 50 seconds to change from dark color to light color. Ideal, especially for use in some situations where the environment changes quickly, such as: when a vehicle driving on a highway enters or exits a tunnel, the existing photochromic lenses cannot change color quickly, and often the lenses are still dark after entering the tunnel for a period of time , leading to blurred vision when driving in the tunnel, and the lens is still light-colored after driving out of the tunnel for a period of time, causing strong light to illuminate the human eye and making it impossible to open the eyes, reducing the safety of use

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