激光清除硅橡胶伞裙污秽及老化表层技术研究

Technology of Removing Pollution and Aging Surface of Silicone Rubber Shed

针对硅橡胶伞裙表面污秽和老化引起憎水性下降的问题,该文利用激光器清洗技术对硅橡胶伞裙表面的污秽及老化表层清除技术进行了研究。依据硅橡胶在激光光斑照射时会出现快速气化的原理,对硅橡胶伞裙表面污秽和老化表层进行了清除研究。清除采用的激光光斑功率为66W、光斑脉冲200kHz、清洗宽度3cm、行走速度3mm/s和清洗深度0.03mm/次。根据不同清洗深度的硅橡胶表层进行了傅里叶红外光谱测试(Fourier transformed infrared spectroscopy FTIR)和200倍的表面龟裂情况观测,当清洗深度≥0.1mm时,羟基键(-OH)会明显减少,在硅氧键和硅甲基光谱附近,杂乱的官能团被清除,龟裂也基本消失,因此推荐清洗深度为0.1~0.2mm。激光清洗后的硅橡胶表面憎水性迁移良好,其憎水性丧失恢复和迁移相比未清洗表面有明显提高。

In order to solve the problem that the hydrophobicity of the silicone rubber shed reduces due to contamination and aging,a laser cleaning technology is used to remove the surface contamination and aging surface of the silicone rubber shed.Based on the principle of rapid gasification of the silicone rubber when irradiated by a laser spot,the contamination and aging surface of the silicone rubber shed are removed.The power of the laser spot used for cleaning is 66 W,spot pulse 200 kHz,cleaning width 3 cm,walking speed 3 mm/s and cleaning depth 0.03 mm/time.Fourier transform infrared spectroscopy(Fourier transformed infrared spectroscopy,FTIR)and 200 times surface cracking observation are carried out on the silicone rubber surfaces with different cleaning depths.When the cleaning depth is greater than or equal to 0.1 mm,the hydroxyl bond(-OH)will be significantly reduced.The disordered functional groups are removed and the cracking is almost disappeared near the SiO2 bonds and silicone methyl spectrum.Therefore,the recommended cleaning depth is 0.1-0.2 mm.After laser cleaning,the silicone rubber surface has good hydrophobicity migration,and the recovery and migration of the hydrophobicity loss of the silicone rubber surface are significantly improved compared with those of non-cleaned surface.