Preparation method of long-service-life two-dimensional code label for outdoor atmospheric environment

[0019] Example 1

[0020] Select 304 stainless steel, use laser engraving technology (laser repetition frequency is 20 kHz, engraving linear speed is 400 mm / s) to process the two-dimensional code pattern on the surface of the stainless steel, and then apply UV metal ink and ink to the two-dimensional code pattern part After curing, before coating the varnish, the surface of the QR code label is treated with decontamination and degreasing, pickling, and water washing followed by drying. The decontamination is washed with absolute ethanol, and the degreasing liquid is 30g / L NaOH, 50g / L Na 2 CO 3 , Soak for 5min at room temperature; pickling solution is 40g / L HCl, 160g / L HNO 3 , Soak for 10 minutes at room temperature, rinse with distilled water, and quickly dry with a hair dryer. Finally, coat the entire label surface with a layer of 100μm high weather resistance and corrosion resistance modified acrylic polyurethane varnish, the modification method is to add 1wt% benzene A

[0021] Example 2

[0022] Select 316L stainless steel, use laser engraving technology (laser repetition frequency is 30 kHz, engraving linear speed is 300 mm / s) to process the two-dimensional code pattern on the surface of the stainless steel, and then apply UV special metal ink to the pattern part of the two-dimensional code. After the ink is cured, the surface of the QR code label is treated with decontamination and degreasing, acid washing, water washing and drying before the varnish is applied. The decontamination is washed with absolute ethanol, and the degreasing liquid is 50g / L NaOH, 40g / L Na 2 CO 3 , Soak for 10min at room temperature; pickling solution is 50g / L HCl, 140g / L HNO 3 , Soak for 5 minutes at room temperature, rinse with distilled water, and quickly dry with a hair dryer. Finally, a layer of high weather resistance and corrosion resistance modified fluorocarbon varnish with a thickness of 80μm is applied to the entire label surface. The modification met

[0023] Example 3

[0024] Select 304 stainless steel, use laser engraving technology (laser repetition frequency is 25 kHz, engraving linear speed is 450 mm / s) to process the two-dimensional code pattern on the surface of the stainless steel, and then apply UV photosensitive ink and ink to the pattern part of the two-dimensional code After curing, the surface of the QR code label is treated with decontamination and degreasing, acid washing, water washing and drying before coating the varnish after curing. The decontamination is washed with absolute ethanol, and the degreasing liquid is 60g / L NaOH, 30g / L Na 2 CO 3 , Soak for 8min at room temperature; pickling solution is 60g / L HCl, 150g / L HNO 3 , Soak for 8min at room temperature, rinse with distilled water and quickly dry with a hair dryer. Finally, a layer of modified silicone varnish with high weather resistance and corrosion resistance with a thickness of 75 μm is coated on the entire label surface, and the modificatio