[19a-N304-1~10] 3.7 Laser processing

[19a-N304-2] Abrasion and heat resistance improvements of SiO₂ film formed by F₂ laser induced photocchemical surface modification of silicone coated film on polycarbonate

〇Hidetoshi Nojiri¹, Masayuki Okoshi² (1.RENIAS, 2.National Defense Academy)

Keywords:photochemical modification, F2 laser, silicone

To manufacture an automotive resin window, we have been considering wet silicone coating on polycarbonate (PC) and its photochemical modification by F₂ laser irradiation. To suppress cracking in modified SiO₂ film, mesh mask was set on the silicone coated surface and F₂ laser was irradiated through the mesh mask. Then the distance d between mesh mask and silicone surface was changed from 0 mm to 20 mm. After laser irradiation, Taber abrasion test was done at 1000 cycle and delta haze (ΔH₁₀₀₀) was measured. As increasing laser irradiation time, ΔH₁₀₀₀ was decrease once and then increased. But when d was 20 mm, low ΔH₁₀₀₀ was indicated at the all laser irradiation time. And heat resistance was also improved at d=20 mm. These improvement of mechanical properties were believed to be the result of reducing stress in the SiO₂ film.