Preparation and performance analysis of near-infrared absorption PVB films

Near-infrared (NIR) absorbing filtering films were made by melting and blending from polyvinyl butyral (PVB) as the base material and near infrared absorbing dyes (NIR775 and NIR858) as the additives. Thermal gravimetric analysis (TG) shows that the near infrared absorbing dyes have good thermal stability. The near infrared absorbing filtering films have good near infrared absorption and transmission measured by spectrophotometer. When the contents of near infrared absorbing dye NIR775 and NIR858 are 0.2 wt% and 0.4 wt% respectively, the average transmittance of the near infrared absorbing filtering films in 660-930 nm is 0.148%, the average transmittance of the near infrared absorbing filtering films in 400-630 nm is 23.578%. The near infrared absorbing filtering films have good thermal aging properties. The dispersion of the near infrared absorbing dyes on the surface of the near infrared absorbing filtering film is not even, the particles are easy to be found by microscope of 400×.