A kind of manufacture method of polarized PVA film for sunglasses and polarized PVA film

Abstract

The invention discloses a method for manufacturing a polarized PVA film for sunglasses. The manufacturing process includes: PVA film pretreatment, dipping, cleaning, stretching, auxiliary treatment, drying and protective film coating. Wherein, in the exhaust dyeing step, a dichroic macromolecular dye, a dyeing assistant and a leveling agent are used for exhaust dyeing; in the assistant treatment step, a softener is used for processing. The polarized PVA film prepared by the invention has the characteristics of high temperature resistance, no discoloration, no color difference, softness and easy processing. The invention also provides a polarized PVA film.

Description

Technical field [0001] The present invention relates to the field of polarizing tabs, and more particularly to a high temperature resistance, uncoamine, a sunglasses of sunglasses and a preparation method thereof, and a preparation method thereof. Background technique [0002] Polarized glasses belong to a special sunglasses, ordinary sunglasses or dyeles are only utilizing the effect of the dimming, and the light cannot be filtered, so it can only reduce the intensity of glare, ultraviolet light, but can not completely block the light. Over, makes the scenery, including glare, but the scenery under the light glare is unclear and cannot completely eliminate the impact of glare. The polarized lens is compared to the ordinary sunglasses, which can completely block glare glare caused by various factors such as scattering, reflection; at the same time, it can also completely block the ultraviolet rays detrimental to the human eye, making people long-term activities under strong light...

AI Technical Summary

Problems solved by technology

[0003] The PVA film with polarizing function in commonly used polarized glasses is mostly dyed with iodine as a dichroic substance. Since iodine is easy to sublimate at high temperature, it has defects of poor heat resistance and light resistance, which limits the use of polarized glasses. service life

At the same time, iodine-based polarizing film is prone to chromatic aberration and color shift due to high temperature during the injection molding or bending process of sunglasses, which affects the quality of polarized sunglasses.

[0004] In addition, due to the conventional polarizer production process, most of its PVA polarizing films are brittle, or become brittle after drying, and are not easy to store, so it is difficult to directly use them in the production of sunglasses.

Therefore, the production of polarizers mostly uses adhesives to attach triacetate cellulose to the upper and lower layers of the PVA polarizing film for protection. In the production process of sunglasses, the triacetate cellulose film will be bonded to the lens through adhesives, and the polarizer needs to be bent to form a certain shape. Radian, often delamination phenomenon, it can be seen that the polarizer with a protective layer of triacetate cellulose has a negative impact on the production of sunglasses