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Preparation Of High-solid Alkyd Resin From Waste Recycled Polyester Materials

Jun 03, 2020

Our country's current consumption of PET plastic beverage bottles is very high. According to statistics, the production capacity of PET for bottles is only 3.1 million tons and the output is 1.7 million tons, of which 1.2 million tons are sold domestically and 500,000 tons are exported. Such a large amount of waste plastic products put a lot of pressure on environmental protection. It is often said: "Waste is put together as garbage, and waste placed separately is resources." If we can grasp the recycling and utilization of waste PET, not only can reduce environmental pollution, but also provide a new raw material way for industrial production. The current development trend of PET recycling and my country's recycled PET industry are facing many problems. Due to insufficient domestic waste PET recycling and processing capacity, the source of waste PET bottles cannot meet the excessive expansion of fiber production capacity, and raw materials have become a bottleneck in the development of the industry. Judging from the price of bottle flakes in recent years, it was 3200~3800 yuan/t in 2001, and it has now risen to 7000~8000 yuan/t, almost doubling. Therefore, its recycling technology has broad prospects. At present, most plastic recycling companies first cut waste into fragments and then pass through the flotation tank. Since the bottle body of the plastic bottle is made of polyethylene terephthalate (PET), the bottle fragments will settle to the bottom of the tank. The bottle cap floats on the water, thus separating the two and recycling them separately. The separated polyethylene terephthalate is washed through another washing tank to remove the trademark fragments, adhesives and other impurities, and then rinsed and dried before being available for reuse. Preparation of high-solid alkyd resin, polyester resin, amino resin, and various coatings after acid hydrolysis or transesterification not only increases economic benefits, but also reduces "white pollution" to the environment, creating certain social benefits A good thing that benefits the country and the people.