Method for recycling colored PVB (Polyvinyl Butyral)

The invention discloses a method for recycling colored PVB (Polyvinyl Butyral), comprising the following steps of: placing the colored PVB in a container, adding a solvent and heating to stir and dissolve; adding a decolorizing agent to decolorize and filtering after stirring; completely vaporizing the PVB filtrate and recovering the solvent; or vaporizing and concentrating the PVB filtrate and adding into an exhaust type extruder for extrusion and granulation, wherein an exhaust port of the extruder is connected with a solvent recovery device to recover the solvent; or adding the PVB filtrate into water to precipitate out the PVB, and taking out the PVB which is attached to the inner wall of the container of a stirrer for drying so as to obtain recyclable colorless or light-colored PVB.