Abstract: Regenerated transparent PC sheets （RPC-SH） were prepared by using the waste transparent polycarbonate （RPC） selected from industrial solid wastes. The surface of RPC-SH was hardened using silicone （STC2000） and acrylic （SY-5223） transparent wear-resistant coatings to obtain hardened sheets， i.e. Si-RPC-SH and SY-RPC-SH. The coating stability， surface scratch resistance， transparency and mechanical properties of the three types of hardened sheets were investigated. The results indicated that the two types of coatings could be well combined with the surface of RPC-SH， and their adhesion grade reached Grade 1. This indicates a certain amount of resistance to hot water， acid， alkali， and salt corrosion. After the surface hardening treatment， the pencil hardness of RPC-SH increased from 5B to H and HB， and their weight loss after loading was smaller. However， their surface wear resistance and scratch resistance were improved significantly. Owing to a lower light refractive index of the coating， the light transmittances of Si-RPC-SH and SY-RPC-SH were slightly enhanced compared to RPC-SH， but their hazes were reduced. With the influence of organic solvent in the coating， the mechanical strength of the hardened RPC-SH was lower than that of the pristine RPC-SH.

Key words: polycarbonate, regeneration, transparency, coating, abrasion resistance modification