Preparation and performance of low refractive index UV fiber Coatings

Optical fiber coating is an indispensable key protective material in the production and application of optical fiber. It provides strength protection, waterproof and stress buffering for optical fiber, so as to maintain the excellent mechanical and optical properties of optical fiber. Among them, the most prominent application is ultraviolet UV curing optical fiber coating. The low-refractive index optical fiber coating is a special coating for the inner layer of the optical fiber. The cured film has a low refractive index, which can increase the numerical aperture of the optical fiber, and effectively improve the long-distance transmission efficiency of light energy on the premise of ensuring good mechanical properties. , to reduce light loss. The article "Preparation and Performance Research of Low Refractive Index UV Optical Fiber Coating" used fluorine-containing acrylate monomer as the main raw material, and synthesized fluorine-containing acrylic resin with low refractive index by free radical polymerization and epoxy ring-opening grafting. (FA), and using it as the main raw material, with fluorine-containing acrylate monomers and multifunctional reactive diluents, an optical fiber coating with a refractive index lower than 1.378 0 was prepared on quartz glass with a 50 μm wire Bar Coater, The influencing factors of the refractive index were analyzed and studied, and the comprehensive performance of the coating film was verified.

The conclusion shows that the low refractive index fluorine-containing acrylic resin was synthesized step by step by free radical polymerization and epoxy ring-opening grafting with fluorine-containing acrylate monomer as the main raw material. Using fluorine-containing acrylic resin as the main raw material, combined with fluorine-containing reactive diluent, multifunctional reactive diluent, and photoinitiator, an optical fiber coating with a refractive index lower than 1. 378 0 was prepared. The study found that the refractive index is closely related to the fluorine content of the system, the higher the fluorine content, the lower the refractive index. Experiments also prove that the refractive index is also related to other properties of coatings such as appearance, viscosity, curing speed, and mechanical properties. The research and development of low refractive index UV optical fiber coatings plays an important role in improving the optical transmission efficiency of optical fibers and expanding their application fields.