Material Drying
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ABS recycled material yellowing and brittleness
Problem Phenomenon
After using water-washed/regenerated ABS, the product color is yellow, the toughness is significantly reduced, and the quality is unstable.
Cause Analysis
The regenerated material has undergone multiple thermal processing and water washing, the molecular chains are continuously broken and degraded during repeated thermal history, and residual moisture and impurities remain; if drying is not thorough, the moisture-induced wet-heat aging and thermal degradation superimpose, making the product color yellow and the toughness further deteriorated.
Solution
①The regenerated material ratio ≤30% and fully mixed with new material; ②re-dry the regenerated material; ③appropriately lower the melt temperature and shorten the residence time; ④prohibit the use of multiple-times regenerated material for products with high toughness requirements; ⑤establish a regenerated material performance ledger.
Key Takeaway
ABS regenerated material needs to 'control the ratio, control the thermal history, control the drying': the performance of multiple-times regenerated material drops off a cliff, don't use it for key parts; yellowing and brittleness are direct evidence that the regenerated material's thermal history exceeds the standard.
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