'Because of the long service life of electrical appliances, the aging properties of plastics have declined. It is simple to use conventional plastics to modify and regenerate the granulation. The low value-added of blended modification technology makes it difficult to apply to miscellaneous wastes, and it is difficult to improve the performance in the same direction. Mainly for the low-end market, homogeneity is serious.' said Li Yingchun, vice president of the School of Materials Science and Engineering at North University.
Li Yingchun told reporters that they pioneered the chain extension method from the point of view of molecular remediation, and took full advantage of the fact that high-ageing waste plastics contained more active end groups, and added chain extenders to achieve in-situ chain extension repairs to produce low-cost products. High-performance recycled composite material, impact strength of 6.3KJ/m2, tensile strength of 43.7MPa, close to the level of the original material, comprehensively improve the comprehensive performance of the reuse of waste plastics.
At the same time, due to the similar density and appearance of HIPS (High Impact Polystyrene) and ABS in waste electrical plastics, it is difficult to separate them and affect recycling. For this reason, Li Yingchun's team adopted the method of blending R-HIPS and R-ABS. , Aiming at all kinds of low-ageing wastes, adopting multiple compound blending modification process to prepare high-performance recycled polymer alloys, realizing high-value recycling and reuse of HIPS and ABS, so that the regenerated composite materials can maintain the original plastic properties and value. , Instead of degraded use, with greater economic and social benefits, is currently looking for industrial cooperation.
It is understood that the amount of waste electrical appliances scrapped annually in China exceeds 200 million units, a total of 5 million tons. These household appliances contain plastics mainly HIPS, ABS and polypropylene, accounting for more than 80% of the total.