Development and Application of New Ultraviolet Fluorescent Ink(I)

With the advancement of science and technology, more and more people are studying fluorescence, and the application range of fluorescent substances is becoming wider and wider. Apart from being used as a dye, fluorescent substances have also been widely used in organic pigments, optical brighteners, photooxidants, coatings, chemical and biochemical analysis, solar energy traps, anti-counterfeit labels, drug tracers, and lasers. The authors studied the use of fluorescent compounds in fluorescent security inks.

Commodity anti-counterfeiting is an extremely important task, and increasing the number of anti-counterfeiting marks is one of the important methods. Therefore, anti-counterfeit inks play an extremely important role in counterfeiting. In this study, four self-made organic fluorescent powders were used as raw materials to formulate four new fluorescent inks that were apparently white and showed vivid red, yellow, green, and blue fluorescence under ultraviolet irradiation. Due to the use of organic phosphors, the formulated ink has the characteristics of stable properties, acid and alkali resistance, solvent resistance, lightfastness, and stable fluorescence intensity. The product has been tested to meet offset ink standards and can be used on offset presses.

1 experiment

1.1 Raw materials

Pigments: 4-color organic phosphors (homemade). Ink base: phenolic resin ink base (Beijing Xinhua Printing Equipment Factory). Solvent: High boiling point kerosene.

1.2 Ink formulations are shown in Table 1.

1.2 Ink production method

According to the formulation requirements, the solvent, organic phosphor and ink base material are put into the tank, and the mixture is fully stirred until no dry powder is obtained. Then, it is repeatedly ground by a three-roller until the scraper fineness is 15 μm or less.

2 Results and Discussion

2.1 Ink fluorescence spectrometry

The fluorescence spectra of the four inks were tested to understand their excitation and emission properties. The maximum excitation wavelength λex and the maximum emission wavelength λem were measured. The results are shown in Table 2.

(to be continued)