In this work, a novel polymeric fluorescent brightener agent based on 4,4′-diamino-stilbene-2,2′-disulfonic acid-triazine structure has been synthesized by radical polymerization. The structure of 4,4′-diamino-stilbene-2,2′-disulfonic acid -based polymeric fluorescent brightener agent was characterized by Fourier-transform-infrared spectroscopy, 1HNMR, and gel permeation chromatography. Photo-property was measured and analyzed by the ultraviolet–vis spectra and fluorescence spectra. The performance on paper was evaluated by determining the surface strength and smoothness, the brightness degree, and the post color number value of paper. Results showed that 4,4′-diamino-stilbene-2,2′-disulfonic acid-based polymeric fluorescent brightener agent had a better light stability in water solution than that of 4,4′-diamino-stilbene-2,2′-disulfonic acid-based fluorescent monomer as light stabilizer. Through the surface-sizing experiment and ultraviolet aging experiment, the 4,4′-diamino-stilbene-2,2′-disulfonic acid-based polymeric fluorescent brightener agent not only enhanced the surface strength and smoothness of paper as a surface-sizing agent, but also had a better effect on anti-ultraviolet aging than that of 4,4′-diamino-stilbene-2,2′-disulfonic acid-based fluorescent monomer as a light stabilizer and fluorescent brightener agent.

In the paper, the authors present the current situation of recycling waste plastics and technology of converting waste plastics into oil in China. The process of pyrolysis and pyrolysis-catalytic upgrade method has been evaluated in terms of technology and economics. The conditions of a plant, that is to be constructed for converting waste plastics to oil, such as collecting system, transportation distance of waste plastics, sorting method and controlling over secondary pollution, are investigated. In addition, the commercialization and area of research on this technology in China are proposed.