再生PC的表面耐磨改性研究

Study on modification of surface wear resistance for regenerated transparent polycarbonate

以从工业固废中分选出的废旧透明聚碳酸酯(RPC)为原料制备了再生透明PC板材(RPC-SH),分别选用有机硅类(STC2000)和丙烯酸类(SY-5223)透明耐磨涂层对RPC-SH进行表面加硬处理,得到加硬板材Si-RPC-SH和SY-RPC-SH。分别对3种板材进行涂层稳定性、表面耐刮擦性能、透明性能和力学性能测试。结果表明,两种涂层均能与PC透明板材表面良好结合,附着力等级达到1级,具备一定抵抗热水、酸、碱、盐侵蚀的能力;经过表面加硬处理后,再生透明PC板材的铅笔硬度从5B分别提高到H和HB,负载砝码后的磨耗失重更小,表面耐磨性和耐刮擦性能获得显著提升;由于涂层具有更低的光折射率,加硬板材Si-RPC-SH和SY-RPC-SH透光率相对于RPC-SH均略有增强,雾度下降;由于涂层中有机溶剂的影响,加硬板材力学强度相对于再生透明PC板材有所下降。

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 acryl⁃ic(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.