Liquid crystal temperature-sensitive anti-counterfeiting printing ink and preparation method thereof

Abstract

The invention provides liquid crystal temperature-sensitive anti-counterfeiting printing ink. The printing ink comprises the following components in parts by weight: 15-25 parts of cholesteric liquidcrystal and a microcapsule thereof, 10-15 parts of a water-soluble glue solution, 50-60 parts of a connecting material, 0.1-1 part of an antifoaming agent, 0.1-1 part of a leveling agent, and 0.1-3 parts of a viscosity regulator, wherein the cholesteric liquid crystal is a mixture of 4-cyano-4'-amyl biphenyl and cholesteric oleyl carbonate; the cholesteric liquid crystal microcapsule is a microsphere capsule prepared from the cholesteric liquid crystal and a water-soluble glue solution; and the water-soluble glue solution is a mixture of gelatin and Arabic gum. The a printing ink has the advantages of easily available raw materials, low raw material cost and simple preparation method, and is suitable for the field of anti-counterfeiting labels, the color of an anti-counterfeiting pattern can change due to the temperature change, defects of slow color change and poor contrast effect of a conventional temperature-sensitive ink are overcome, and thus the printing ink has a great application prospect in the field of anti-counterfeiting package.

Description

technical field [0001] The invention relates to the field of inks, in particular to liquid crystal temperature-changing anti-counterfeiting inks and a preparation method thereof. Background technique [0002] In the field of printing and packaging, in order to meet higher anti-counterfeiting requirements, temperature-changing anti-counterfeiting inks are usually printed on labels. When the ambient temperature changes, the printed graphic information can show different color effects according to different temperatures. Play a significant role in identification and anti-counterfeiting. As the core component of the anti-counterfeiting ink, the low-temperature heat-sensitive color-changing pigment contains a special temperature-changing (heat-sensitive) functional material, which can significantly change its absorption of visible spectrum wavelengths when heated or cooled. change to change. [0003] Liquid crystal material is a temperature-changing functional material with exc...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides liquid crystal temperature-changing anti-counterfeiting ink and its preparation method. The raw materials are easy to obtain, the cost of raw materials is low, and the preparation method is simple. The technical temperature-changing anti-counterfeiting ink has problems such as slow color change and poor contrast effect, and has great application prospects in the field of packaging anti-counterfeiting