Low refractive index optical pressure sensitive adhesive needs to be developed

Optical pressure sensitive adhesive (OCA) is widely used in the field of optical display, used to connect display module, glass cover plate, plastic cover plate, touch screen and other display units, as its indispensable key material, OCA optical adhesive is more and more widely used. OCA optical adhesive in the display field is generally used for the connection of display Windows and display modules (LCD and OLED).

In some applications, the OCA optical adhesive needed for connection has a low refractive index, which can reduce the reflection of external strong light, so that the display can still display clearly in the sun or strong light. The refractive index of the ordinary OCA optical glue is generally about 1.47, and the refractive index of the display window material glass (1.5) is close, when in the sun or strong light, the outside light through the screen and reflected back, will cause interference to the screen display light, resulting in the screen picture is not clear.

We need to provide a low refractive index optical pressure sensitive adhesive. In order to solve the problem that the refractive index of traditional OCA optical adhesive is close to that of the display window material glass in the existing technology, when in sunlight or strong light, the outside light will be reflected back through the screen and cause interference to the light emitted by the screen display, resulting in unclear screen picture display.

An optical pressure-sensitive adhesive with a low refractive index was obtained by using a fluorinated acrylic polymer with a low refractive index, and under the combined action of diluent monomer, photoinitiator, antioxidant, and stabilizer. Another purpose is to provide the preparation method of low refractive index optical pressure sensitive adhesive as described above. Fluorine acrylate polymer, diluent monomer, stabilizer, antioxidant, and photoinitiator are mixed and mixed, and ultraviolet irradiation is used to cure, to obtain optical pressure-sensitive adhesive. This method is simple to operate and can be obtained by controlling the wavelength of ultraviolet light with low refractive index optical pressure sensitive adhesive.