Erase color variable ink
A friction discoloration, ink technology, applied in ink, household appliances, applications, etc., can solve the problems of poor resistance, general circulation resistance, instability, etc., to achieve excellent printability, improve anti-counterfeiting level, and improve the effect of anti-counterfeiting level.
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Embodiment 1
[0019] Embodiment 1, the preparation of wiping variable color offset printing ink:
[0020] Tribochromic material: 25%
[0021] Phenolic resin oil: 30%
[0022] Alkyd resin (oil degree 70): 22%
[0023] Calcium carbonate filler: 20%
[0024] Desiccant: 1%
[0025] High boiling point kerosene: 2%
[0026]After the above-mentioned substances are weighed in proportion, they are stirred in the mixing tank for 20-30 minutes, pre-dispersed, and then rolled on a three-roll ink padding machine to make it reach the technical index of offset printing ink application (ink fineness≤15 microns, The fluidity is 28-35mm), which is the finished product of wiping variable color offset printing ink. Its imprint is black and green, and it can turn red when rubbed with white paper under a certain force, and it is fully transparent in the near-infrared region.
Embodiment 2
[0027] Example 2, adding 20% of the ZnS:Cu ultraviolet fluorescent pigment (which emits visible green light under the excitation of 365nm ultraviolet light) to the wiping variable color offset printing ink prepared in Example 1, according to the known ink processing method, It can be made into printing ink. In addition to the anti-counterfeiting features of frictional discoloration and full transmission in the near-infrared region, it also has the anti-counterfeiting function of ultraviolet fluorescence.
Embodiment 3
[0028] Embodiment 3, in the wiping variable color offset printing ink prepared in embodiment 1, add 20% Y 2 o 2 S: Eu ultraviolet fluorescent pigment (under the excitation of 365nm ultraviolet light, it emits visible red light), according to the known ink processing method, it can be made into printing ink. In addition to the anti-counterfeiting features of rubbing discoloration and full transmission in the near infrared region, It also has the anti-counterfeiting function of ultraviolet fluorescence characteristics.
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