Cleaning of Waste Fishing Nets and Preparation of High-Grade Recycled Nylon Fishing Net Particles
The recycling of waste plastics is imminent,especially for the polyamide(PA,nylon)waste fishing nets in marine waste plastics.At present,the particles of regenerated PA fishing nets have many different color points and poor purity,which cannot meet the needs of high-end and light-color products.In this paper,the effects of grinding,detergent types and detergent concentrations on the removal of the impurities on the surface of recycled PA fishing nets were studied.The results show that grinding is beneficial to the removal of impurities in fishing nets,and sodium dodecyl sulfate(K12)is superior to other detergents in cleaning fishing nets.In addition,the washing concentration has little effect on the cleaning effect of waste fishing nets.The sediment impurities in the waste fishing nets are difficult to be completely separated by simple cleaning.It is necessary to purify the waste fishing nets by filter filtration again during the process of melt granulation.Experiments show that the recycled PA fishing net particles prepared by 100 mesh filter do not meet the high-level requirements,and there are some sediments in their ashes.When the filtration accuracy of the filter reaches 300 mesh,the purity of the recycled PA fishing net particles is close to the level of new material(PA6 HY2800A),which can meet the high-level requirements.
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