Multilayer structure having fine periodic structure
A periodic structure and structure technology, applied in the directions of lamination, lamination auxiliary operation, household appliances, etc., can solve the problems of high cost of making printing plates, weakened decorative effect, difficult curved surfaces and concave and convex surfaces to form fine periodic structures, etc. The effect of excellent productivity and excellent decorative effect
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Embodiment 1
[0138] PET films were laminated on both surfaces of the aluminum plate, which was then formed into a can body to prepare a laminated structure. After shaping, the layer thicknesses were such that the aluminum plate was about 100 μm thick and the PET film on the inside and outside each was about 6 μm thick. The laminated structure was irradiated with YAG fourth harmonic (wavelength, 266 nm) from the outer PET film side by using a laser beam irradiation device. The pulse of the YAG laser has a pulse width of 5 ns and a pulse repetition frequency of 10 Hz. The transmittance of the PET film for the fourth harmonic is 0%.
[0139] As a result, a fine periodic structure in a concavo-convex shape was formed in the surface of the outer PET film, and a structural color showing iridescence was observed. The period of the formed fine periodic structure was about 1.6 μm.
Embodiment 2
[0141]A PET film was laminated on one surface of the aluminum plate, and thereafter, vinyl chloride / vinyl acetate paint (VAGH) was applied to the surface of the PET film to prepare a laminated structure. Here, the aluminum plate corresponds to the base material, the PET film corresponds to the coating film, and the vinyl chloride / vinyl acetate paint corresponds to the protective layer. The layer thickness is such that the aluminum plate is 200 μm thick, the PET film is 12 μm thick, and the vinyl chloride / vinyl acetate paint is about 2 μm thick.
[0142] As the laser beam to be irradiated, a Q-switched pulsed YAG laser fourth harmonic (wavelength, 266 nm) was used, which was not permeable to the PET film but permeable to the vinyl chloride / vinyl acetate paint. The transmittance of the PET film for the fourth harmonic of YAG is 0% and the transmittance of the vinyl chloride / vinyl acetate coating for the fourth harmonic of YAG is 85.4%. The pulse of the YAG laser has a pulse wid...
Embodiment 3 to 9 and comparative example 1 to 5
[0145] The resin compositions for various coatings shown in Table 1 were applied to one surface of a quartz glass plate (0.1 cm thick, 1 cm wide, 6 cm long, Ra=0.55 μm) in such a manner that the coating film thickness was 2 μm. Samples of Examples 3 to 9 and Comparative Examples 1 to 5 were prepared. By using the above-mentioned laser beam irradiation apparatus, the coating film of the prepared sample was irradiated with a laser beam having a wavelength of 266 nm to confirm whether an iridescent color was exhibited and whether the laser beam was absorbed in the laser wavelength region by using an ultraviolet spectrophotometer. The results are shown in Table 1.
[0146] Table 1
[0147]
[0148] As a result, in Comparative Examples 1 to 5 in which no benzene ring was contained in the skeleton of the paint resin, there was no change in appearance before and after irradiation with laser beams. On the other hand, in Examples 3 to 9 having a benzene ring, regularly arranged ra...
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