Color-changing plate and preparation method thereof
A technology of sheet and discoloration layer, applied in the field of structural color, can solve the problems of unprotected ink surface, loss of light change, unimproved thermochromic polymer, etc., to avoid poor weather resistance, difficult change, and real-time monitoring of heat generation. Effect
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Embodiment 1
[0055] 1) Select 304 stainless steel as the base layer, polymethyl methacrylate as the transparent polymer, and Fe with a particle size of 200±2nm 3 o 4 Microspheres as photonic crystals. The linear thermal expansion coefficient of polymethyl methacrylate is α=80×10 -6 / °C.
[0056] 2) Polish the surface of the base layer and detect its surface roughness until the roughness is less than or equal to 50nm, then soak in absolute ethanol for 5 minutes, blow dry with nitrogen, wash with deionized water, and blow dry.
[0057] 3) The base layer is scanned by a femtosecond laser with a wavelength of 600nm, a pulse width of 75fs, and a repetition rate of 1KHz; the pulse energy is 4mj / 1Khz; the nano-grating structure is obtained, and the spacing between the nano-gratings is controlled to be 166nm and the depth is 333nm.
[0058] 4) Polymethyl methacrylate is heated to 220°C and maintained for 10 minutes, showing a flowable viscous state; put it into a stirring device, stir at 1000rp...
Embodiment 2
[0062] 1) Choose cast iron as the base layer, polyamide as the transparent polymer, and SiO with a particle size of 200±2nm 2 Microspheres as photonic crystals. The coefficient of linear thermal expansion of polyamide is α=120×10 -6 / °C.
[0063] Wherein cast iron carbon 3.5wt%, silicon 2.4wt%, less than 1%wt.
[0064] 2) Polish the surface of the base layer and detect its surface roughness until the roughness is less than or equal to 50nm, then soak in absolute ethanol for 5 minutes, blow dry with nitrogen, wash with deionized water, and blow dry.
[0065] 3) The base layer is scanned by a femtosecond laser with a wavelength of 800nm, a pulse width of 75fs, and a repetition rate of 1KHz; the pulse energy is 4mj / 1Khz; the nano-grating structure is obtained, and the spacing between the nano-gratings is controlled to be 166nm and the depth is 215nm.
[0066] 4) Polyamide is heated to 270°C and kept for 10 minutes, showing a flowable viscous fluid state; put it into a stirring...
Embodiment 3
[0070] 1) Select wrought iron as the base layer, polyvinyl chloride as the transparent polymer, and SiO with a particle size of 240±2nm 2 Microspheres as photonic crystals. The coefficient of linear thermal expansion of polyvinyl chloride is α=80×10 -6 / °C.
[0071] 2) Polish the surface of the base layer and detect its surface roughness until the roughness is less than or equal to 50nm, then soak in absolute ethanol for 5 minutes, blow dry with nitrogen, wash with deionized water, and blow dry.
[0072] 3) The base layer is scanned by a femtosecond laser with a wavelength of 600nm, a pulse width of 75fs, and a repetition rate of 1KHz; the pulse energy is 4mj / 1Khz; the nano-grating structure is obtained, and the spacing between the nano-gratings is controlled to be 200nm and the depth is 260nm.
[0073] 4) Heat the polyvinyl chloride to 165 ° C and keep it for 10 minutes, showing a flowable viscous flow state; put it into the stirring device, stir at 1000 rpm for 5 minutes, ...
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