UV Degradation and Stabilization of Polyolefins (PPT)

摘要

1 Solar energy and UV radiation overview 2? Polymer photodegradation and weatherability 3? Polymer stabilization technologies – UVA and HALS 4? Application examples 5? Summary : HALS provide polymer protection, at surface and throughout bulk of the material. ? UVA provide polymer protection, but not very effective at surface (Beer’s law and absorbance/concentration effect) ? UVA may provide some slight improvements in color stability ? UVA does not make a bad pigment good, but may make a good pigment a bit better…. ? Colorant formulation is critical to achieving fade resistant colors. ? More pigment + more HALS + more UVA = more performance