Study on UV Degradation Resistance of a Sand-Fixing Material by W-OH
Weimin GAO, Zhiren WU, Zhishen WU, Kentaro IWASHITA and Hirondo INAGAKI
Abstract:A hydrophilic polyurethane sand stabilizer (abbreviated as W-OH), was synthesized by our group, which can connect chemical sand fixation with biological sand fixation. This paper is to investigate the durability of W-OH, analyzing mechanism of UV degradation. And several UV stabilizers of hydroxy-benzophenone (W-UA), thioether (W-UB), hindered phenol (W-UC) and hindered amines (W-US) were used to advance W-OH UV degradation resistance. For evaluating on effect of different UV stabilizers on durability of W-OH, firstly variation of weight of W-OH film under UV radiation measured, and then the effect of UV radiation on W-OH sand-fixing layer was studied further. Results demonstrated that W-OH reacted with O2 under UV radiation and transformed to free-radicals of alkyl peroxide or alkoxy or peroxy or hydroxyl and W-OH was gradually degraded. Durability of W-OH can be improved with composing UV stabilizers and the order of effect was W-US > W-UC > W-UB > W-UA. Composition of W-OH and W-US demonstrated excellent UV degradation resistance, without any surface variation for the sand-fixing layer under UV radiation. Key Words:W-OH, Sand-fixing layer, Durability, UV stabilizer