Study on the Modification of Waste Polyvinyl Butyral (PVB) and its Application in Textiles

Due to the increasing use of laminated safety glass, the issue of polyvinyl butyral (PVB) resource waste has become increasingly serious. The complex composition of waste PVB presents significant challenges for recycling and application. In this paper, PVB was first grafted with phthalic anhydride (PA) to investigate the effect of the modification process on the coating film and coated fabric, thereby guiding the modification research on recycled PVB (rPVB) and successfully preparing rPVB-P. The results indicate that the optimal modification process for PVB involves a modification temperature of 70°C, a modification time of 6 h, and 6 g of PA. The feasibility of applying the prepared coated fabric in the field of trademark ribbon fabric was examined. The surface structure of the coated fabric, prepared with a kaolin mass fraction of 30%, was found to be uniform, with an ink contact angle of 20.32°, and the color fastness to washing and rubbing reached levels 4–5. The overall performance of the coated fabric prepared with rPVB was similar to that of the PVB-coated fabric, demonstrating that rPVB can effectively replace PVB for coating preparation.