The hottest automobile waste plastic renewable coc

2022-08-07
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Automobile waste plastics + renewable coconut oil = polyurethane thermal insulation materials

millions of tons of plastic, metal and rubber wastes are generated every year after the end of the very important service life of the automobile tensile testing machine fixture. Researchers from the Czech Republic have found a recyclable way for automotive plastics, and relevant progress has been published in ACS sustainable chemistry engineering. The structural units of polycarbonate (PC) and polyurethane (PUR) contain polyols, which are ideal raw materials for foaming materials, and can be used as building heat insulation materials, refrigerators, Mats and packaging materials. However, it is still a great challenge to realize this recycling. Some automotive plastic wastes can be directly reprocessed, but PC and pur materials need arduous chemical recycling to be reused

in addition, the coating on PC and pur is also an obstacle, which is not conducive to product recovery. Directly used as insulation foam filler will make the foam too dense or brittle. Nevertheless, researcher Hynek bene?, Aleksander prociak and colleagues have developed a new technology to convert PC and pur into recyclable materials and expand the application of automotive waste

previous studies showed that coconut oil can degrade PC. the team further converted polyurethane fragments such as automobile waste polycarbonate, alloy high carbon steel (or low carbon alloy steel) and cold working die steel into polyols in medium chain length coconut oil glyceride with hydroxyl value of 300 mg kohg – 1 under the action of microwave to prepare low-density polyurethane hard foam materials. The results show that the recovered polyols can replace more than 50 wt% petroleum based polyols in polyurethane rigid foam without affecting the processing and properties. The density of the obtained rigid polyurethane foam is 40 – 44 KGM – 3, the microstructure shows homogeneous fibrous structure, and the closed cell rate is more than 91 vol% λ The coefficient is only 23 MWM – 1K – 1. The compressive strength of polyurethane rigid foam containing 50 wt% recycled polyol exceeds 350 kPa. The polycarbonate is decomposed into a workbench, and the polyol to which the upper beam is connected through two columns contains a rigid benzene ring structure, which is combined with the flexible long chain in coconut oil glyceride. The combination of the two makes the polyurethane hard foam material have good performance

the product is renewable, recyclable and does not degrade. Compared with the commercial foam, the material has good thermal insulation performance and thermal stability, and is an ideal building thermal insulation material

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