Laser-markable organic/inorganic hydrogels and their preparation and applications

Abstract

The invention discloses organic / inorganic hydrogel suitable for laser marking and a preparation method and application thereof, and belongs to the field of macromolecular hydrogel material and laser making. Water-soluble macromolecular chains are adsorbed to the surface of bismuth-bearing oxide particles under physical action first, a monomer, a crosslinker and an initiator are then added to modified oxide particle water dispersion, in-situ chemical reaction is carried out by using an oxidation-reduction initiating system to obtain a three-dimensional crosslinked network structure with embedded laser-sensitive oxide particles, and organic-inorganic hydrogel is formed. The hydrogel is subjected to surface laser irradiation by using a laser making machine to generate a black mark pattern, the cost is effectively reduced, and continuous efficient large-scale marking is provided for hydrogel material. By changing the content of bismuth-bearing oxide particles in the preparation process of the hydrogel and the level of laser power in the marking process, it is possible to form eye-distinguishable text and patterns different on contrast and definition on the surface of the hydrogel.

Description

technical field [0001] The invention belongs to the field of polymer hydrogel materials, and in particular relates to an organic / inorganic hydrogel capable of laser marking and its preparation and application. The soft hydrogel material with high hydrophilicity, high water content and high transparency obtained by this preparation method can produce high-contrast and high-definition black marks on the surface under pulsed laser irradiation, realizing the wet hydrogel material marking, identification and surface modification. Background technique [0002] Polymer hydrogel materials have been widely used in scientific research, industrial production or daily life, and are widely used. The research on hydrogel materials has important scientific and practical significance. As we all know, hydrogel is a three-dimensional cross-linked network structure, which is insoluble in water, but can swell in water, has strong expansion-shrinkage, good biocompatibility and responsiveness to...

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Problems solved by technology

But in fact, this invention needs to prepare a patterned silicon wafer substrate. The patterning of the silicon wafer substrate itself has problems such as high cost, energy consumption, and insufficient flexibility. Chemical reagents are also required to etch silicon wafers, which is easy to pollute the environment and endanger Human health; Chinese Taiwan Patent TW096138957 discloses a method for forming a pattern on the surface of a hydrogel, including the first step of pouring the liquid hydrogel into a molding mold, and the second step placing a patterned light-transmitting sheet on the molding mold and Located on the surface of the liquid hydrogel, the third step uses light projection to condense the liquid hydrogel into shape, and the graphics, characters, numbers and other patterns arranged on the light-transmitting sheet can be covered on the surface of the hydrogel and produce shadows of the patterns, so that Graphics, characters, numbers and other patterns on the light-transmitting sheet can be formed on the surface of the hydrogel as the liquid hydrogel condenses

However, the steps of this method are cumbersome, and special light-transmitting sheets with various patterns need to be designed, so the use is limited; Chinese patent CN201510188821.7 discloses a temperature-sensitive PVA hydrogel marking film containing water-soluble rare earth materials and its preparation The method uses water-soluble rare earth material as the main marker and thermosensitive polyvinyl alcohol hydrogel as the rare earth solution carrier to release the rare earth solution in the PVA mask in a short period of time at the body surface temperature, so that the rare earth solution can penetrate into the subcutaneous tissue , resulting in a bioluminescent marker that is invisible under normal conditions and cannot be wiped off by chemical or physical methods (a fluorescent marker will appear when a 980nm laser is irradiated)

This method is suitable for biological skin labeling, which requires additional instruments to illuminate and detect fluorescent signals, and is difficult to be recognized by the naked eye

The hydrogel marking and patterning preparation methods involved in the above-mentioned patents or documents cannot directly mark the hydrogel material after the later synthesis, and all of them are used in the synthesis process (monomer polymerization and cross-linking reaction). Patterned metal molds or silicon wafer substrates or quartz wafers need to be specially designed and manufactured in the early stage of hydrogel synthesis. The steps are relatively cumbersome, the cost is high, and the lack of flexibility makes it impossible to realize the convenience of hydrogel materials. , efficient and quick marking and identification

So far, no literature and patent reports on hydrogel laser marking have been found

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