Method for preparing ultraviolet fluorescent red plastic film by taking rare earth phosphate glass as photochromic agent and application of ultraviolet fluorescent red plastic film in aspect of anti-counterfeiting

Abstract

The invention discloses a method for preparing an ultraviolet fluorescent red plastic film by taking rare earth phosphate glass as a photochromic agent and an application of the ultraviolet fluorescent red plastic film in the aspect of anti-counterfeiting. For solving the problems of large polarity difference between an inorganic rare earth fluorescent agent and a high polymer material, fluorescent concentration quenching and fluorescent stability and the like of a doped rare earth fluorescent high polymer material, by taking phosphate glass as a matrix, taking Eu<3+> ions as a fluorescent activator and taking Ce<3+> ions as a sensitizer, through the synergistic effect of the phosphate glass matrix, the Eu<3+> and the Ce<3+> in a formula, a fluorescent concentration quenching phenomenon is overcome, thereby improving the adding amount and fluorescence efficiency of rare earth element Eu; glass fragments are prepared by pressing through using a melting method and an ice-water mixture cooling glass sheeter, and then the glass fragments are subjected to high-pressure grinding by using an air-current mill so as to prepare phosphate glass with a particle size of less than 300 nm and containing Eu<3+>, Ce<3+> and fluorescent powder; and a surface modifier is added and fluorescent powder and polymer masterbatches are subjected to melt blending, then a plastic film prepared by film blowing is white and transparent in daylight, and emits bright red light under ultraviolet-irradiation, and the plastic film has special transmission spectrum, and can be used as an anti-counterfeiting packaging film, an anti-counterfeiting label printing base material and an anti-counterfeiting safety line base material.

Description

technical field [0001] The invention relates to a preparation method of an ultraviolet fluorescent red plastic film using rare earth phosphate glass as a photochromant and its application in anti-counterfeiting, belonging to the fields of rare earth polymer materials and anti-counterfeiting. Background technique [0002] There are basically two methods for adding rare earth elements to polymer materials: (1) Rare earth compounds are uniformly dispersed into monomers or polymers as dopants to form rare earth polymers that exist in a doped manner, which is called doping. Heterogeneous rare earth polymers. (2) Synthesize rare earth complex monomers that can undergo polymerization reactions by chemical bonding, and then polymerize with other organic monomers to obtain polymer copolymers, or rare earth ions and ligand groups on the polymer chain such as carboxyl, The sulfonic acid group reacts to obtain a rare earth polymer complex, and the rare earth ion exists in the polymer m...

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Problems solved by technology

[0004] Secondly, most rare earth compounds are highly polar and have poor compatibility with organic polymers with low polarity. In particular, rare earth inorganic compo