Resin photochromic lenses by way of the photochromic materials mainly include coating and surface infiltration two kinds, the ideal method is surface osmosis.
Compared with inorganic glass lenses, it has light weight, high transparency, the size of the lens, good toughness, impact resistance, can be dyed, etc.
Ideal resin lens materials with high refractive index, the characteristics of low density, synthetic resin, the relationship between chemical structure of optical performance and its material, material to introduce molecular halogens elements (
In addition to the fluorine)
, sulfur, phosphorus atoms, the benzene ring, fused ring, and some heavy metal ions can significantly increase the refractive index of the resin.
Photochromic resin lens is joined in the resin material of photochromic material, under the action of a specific wavelength of light radiation, the structure of photochromic material changed, change the light absorption ability of the material itself.
Photochromic resin lens is the key step in the process of photochromic dyes combined with the resin.
The making craft of photochromic resin lens concrete has the following several ways: 1.
Coating method, this method is based on alcohol or other as solvent, organic silicon resin, acrylic resin, carbonate or polystyrene as a coating of coated layer, heat stir after dissolved in solvent, then add photochromic material, ultraviolet absorbent, antioxidant, stir to dissolve and uniform, made of photochromic liquid coating, coating liquid production will under the condition of temperature and humidity appropriate environment, at a certain speed coating or dip in the lens substrate, after being solvent evaporation, form a layer of photochromic film, made of aging resistance, anti-ultraviolet radiation and photochromic glasses.
According to the different combinations of photochromic dyes, resin BianSeJing under strong sunlight and ultraviolet irradiation can produce a satisfactory effect of deep color, no light or no under ultraviolet light back to the original color, different solvents, different temperature, humidity, speed has distinct effect on the color change effect of glasses.
Osmosis is the lens using resin as the base material, through high temperature diffusion make dye diffusion to mirror substrate materials, specific processing technology is to dip has one or more of photochromic dyes substrate is stuck on the convex side of the polymer matrix, and then the mixture high temperature heating for a period of time, after separation of the substrate and the substrate.
The in convex lens penetration is a layer of photochromic material, and then an abrasion resistant layer on the membrane, the abrasion resistance and protection.
This way is by diffusion method, resin color lenses, presented basic constant photochromic characteristics (
The dependence of the dynamics, hot)
, and can make the lens color is not because of the change of lens dioptre number change, such as: the lenses bend j 'Bi degree deepens and appear lens shades, around the central and make up for the deficiency of the color glass lenses.
Blending resin processing method, this method making photochromic lenses in general is based on acrylic polymers or polystyrene polymer base material, add one or several kinds of photochromic material, add a certain amount of antioxidants, light stabilizer, dispersing agent, coupling agent and so on some of the additives, mixing, granulating, before after high temperature, high pressure injection molding.
Ontology polymerization this method it is resin monomer and photochromic dye additives and other components in the same system common aggregation, molding, made of color resin lenses, due to the general lens material is under the condition of peroxide as the initiator of polymerization and form, and peroxide of resin lens causes strong original shading, affect the light transmittance of dark condition, also easy to damage the chemical structure of photochromic dyes which influence on the performance of the final color resin lens color, or even eradicate the photochromic effect, so the photochromic dyes can only be carried out after completion of the matrix polymerization traditionally heat penetration or blending process.
In order to simplify the processing steps, get a uniform color, thermal stability and better color lenses, using diazo basis initiator instead of peroxide initiator of new technology, it can be one or more selected from screw type oxazine photochromic dyes such as direct adding to the polymerization of monomers in bulk polymerization.
This method is available to produce grey or brown lens, can reduce the dependency, color dye has better responsiveness of light, can make the wearer in the sunny weather are fully protected.