Glass steel scrap recycling technology research and development

With the development of the glass steel industry in recent years, the output of electronic equipment such as computers and mobile phones has rapidly increased and entered millions of households. With the upgrading and retirement of these electronic devices, the pollution of waste glass steel products has also aroused people’s concern. . In response to this demand, the global industry has stepped up research on the recycling of glass and steel scrap, and new technologies have emerged one after another.

The easiest way to dispose of FRP scrap is to fill and pulverize it as a filler. For example, the discarded SMC plate is coarsely crushed into 50 to 100 mm by a cutting type coarse crusher, then pulverized into fine grains that can pass through a 4 mm mesh, and finally pulverized in a rotary pulverizer to a small diameter. The spherical particle powder, the FRP waste powder thus produced, can be used as a filler instead of calcium carbonate when manufacturing an SMC automobile body panel, and does not reduce the surface smoothness of the body panel. Similarly, engineers and technicians can easily recycle metal materials from waste printed circuit boards, but there is still a certain degree of difficulty in retrieving the substrate of the printed circuit board, an epoxy resin laminate. In addition, the development speed of thermoplastic resin glass steel has exceeded that of thermosetting resin glass steel for many years. Therefore, the recycling of thermoplastic resin glass steel scrap has also been put on the agenda.

The thermosetting resin glass steel scrap is used as a filler for thermoplastic resins. The University of Brunei, UK, is studying the possibility of using thermosetting resin waste as a filler for thermoplastic resins. They first crushed the waste of thermosetting polyester resin FRP or phenolic resin FRP into fillers with a certain physical size and geometry, and then treated these fillers with a surface treatment agent. The thus-processed filler is uniformly mixed with a polypropylene resin and then molded into a polypropylene composite product using a twin-screw extruder. Their experimental results show that the microstructure of polypropylene composites using thermosetting resin glass steel scrap fillers is very uniform, and the mechanical strength properties of the products are also good.

Epoxy resin laminates are used as fillers for polypropylene. The University of Technology, Pennsylvania, USA is studying the use of epoxy resin laminate scraps as fillers for poly-firing. Using this method to dispose of FRP waste not only consumes a lot of land, but also causes environmental pollution. Later, they succeeded in smashing glass fiber reinforced plastics as a reinforcing material for acrylic resin. According to reports, the filler processed with the epoxy resin laminate waste consists of 60% glass fiber and 40% fully agglomerated epoxy resin. They added 30% of the waste filler and standard materials to the polypropylene resin, and compared the physical properties and strength properties of the polypropylene composite. They also tested the effect of three different sizes of epoxy filler materials on the performance of polypropylene composites.

Recycling of cyclic structure thermoplastic resin composites. The United States Fordj gas company is studying the possibility of recycling the use of cyclic structural thermoplastic resin composites. They first used a liquid glass molding process with a knitted glass fiber fabric and a ring-shaped thermoplastic resin to form a composite with a high glass fiber content (glass fiber content of 58.7%). The composites were then crushed and mixed to form a composite material with an injection molding process. . The physical properties and strength properties of the thus-formed composite materials and the standard ring-shaped thermoplastic resin composite materials were respectively tested. The standard ring structure thermoplastic resin composite is a short glass fiber reinforced thermoplastic composite. The test results show that the physical properties and strength properties of recycled cyclic thermoplastic resin composites are similar to those of standard composites, but the maximum tensile strength is 25% lower than that of standard composites.

Abrasives are produced from laminating material waste. Researchers in Poland are investigating the possibility of producing abrasives from recycled laminar material wastes. They use various laminating material wastes, including phenolic resins reinforced with glass fibers, paper, cotton and mica, epoxy resins and silicone resins. Laminated material waste was studied. The test results show that the glass fiber reinforced epoxy resin laminate material can be used as an abrasive after being treated with arsenic and carbonization. This type of abrasive has a suitable coefficient of friction, and the friction coefficient of the abrasive below 350 degrees Celsius is good for temperature stability.