We prepared two phenylacetate end-capping oligoesters from recycled bisphenol A (RBPA), which is obtained from a phase-transfer agent-assisted basic degradation of waste polycarbonate (WPC). The two oligoesters were successfully applied as epoxy-curing agents. The curing of oligoesters with epoxy is based on the chemistry of a 4-dimethylaminopyridine (DMAP)-catalyzed model reaction of phenyl benzoate and glycidyl phenyl ether. Mechanical and thermal properties of oligoesters/epoxy-cured thermosets were investigated and discussed. Glass transition temperatures (T g), the coefficient of thermal expansions (CTE), thermal decomposition temperatures (T d5%), and tensile strengths of four thermosets are, respectively, in the ranges of 140 to 180 °C, 37 to 72 ppm/°C, 396 to 431 °C, and 49 to 73 MPa. We also prepared carbon fiber composites (CFRPs) by using oligoester/epoxy resin, which could be effectively degraded to phenoxy resin using a catalyst-free aminolysis technique, and undamaged carbon fibers could be recycled without sacrificing mechanical strength or chemical composition. Processes such as recycling of WPC into bisphenol A-based oligoesters as epoxy-curing agents and degrading the epoxy thermosets and CFRPs into useful chemicals have been achieved.
Abstract. According to the basic characteristics and composition of heat-reflective coating, combining with the functional requirements of road materials, the experiment selects the epoxy resin with good wear resistance and adhesive force as a film forming material, with TiO2, SiO2 and extinction powder as the main functional filler. The experiment gets a good formula with suitable viscosity, low glossiness and good cooling effect, optimizes by orthogonal experiment. The experiment evaluates the indoor and outdoor cooling effect of heat-reflective coating, and analyses the road performance of the coating. The results shows that the better heat-reflective coating formula included 12% of titanium dioxide, 4% of silica and 4% of extinction powder. When the dosage of coating is 0.8kg/m2, the indoor specimen of heat-reflective coating decrease the temperature of 12 ~ 14℃, and the specimen under solar radiation can reduce the temperature of 7 ~ 9℃. The pavement of heat-reflective coating has good wear resistance, but the road slip resistance partly declines. Therefore, it needs to add the anti-sliding particles to meet the safe driving requirements. IntroductionThe characteristics of heat absorption and temperature sensitivity can easily lead to pavement rutting, cracks, loose, bleeding and other diseases to asphalt pavement. This has greatly limited the application of asphalt pavement, and the high temperature of asphalt pavement will aggravate the formation of urban heat island effect. At present, the main measures to solve the high temperature disease of asphalt pavement are adjusting the asphalt mixture gradation, improving asphalt grading standards, expanding the application range of modified asphalt, and adding modifier in asphalt mixture. These measures have improved the high temperature performance of asphalt pavement to some extent. But the problem of high temperature does not be solved radically. As a new mode of active cooling, the solar heat-reflective coating has received more and more attention. People did a lot of research on it. Many researchers tried to use Silicone-Acrylate Emulsion, Acrylic Resin and Unsaturated Resin as binder resin to make heat-reflective coating, and applied it to asphalt pavement. But due to the vehicle friction, the coating appears different degrees of damage after a period time of application. Based on this situation, the experiment makes a heat-reflective coating which has good wear-resisting performance and cooling effect. The main content of this paper is about epoxy resin has good wearresisting and that adhesion as film forming material. Meanwhile, TiO 2 , as the main reflective material and SiO 2 as material improves coating's wear-resisting performance.
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