Since the end of the 20th century, nanomaterials have attracted a great deal of attention and active exploration in the academic community as a new type of functional material. Within just a few years, the research and application of nanomaterials have spread across all walks of life. Through the unremitting efforts of scientists from all over the world, the understanding and characterization of the unique small-size effects, surface and interface effects, quantum size effects and macroscopic quantum tunneling effects of nanomaterials have established corresponding theoretical doctrines, laying the foundation for the development of nanotechnology. The theoretical basis of science. Due to a series of functional effects unique to nanomaterials, this material derives many special properties that are not available in other common materials, such as photocatalysis, antibacterial, antifog, antifog, antifouling, superfluid, and light absorption. Blue shift, shielding, anti-aging, dislocation, etc. Because of the excellent performance of nanomaterials, nanofluids have been formed in basic research and applied research in the field of new materials. The development of basic research and application of nanomaterials in various industries is unbalanced. In comparison, nanotechnology The application research in printing inks is lagging behind, and there is still a need for further discussion and research. The purpose of this project is to explore the application of nano-SiO2 in aqueous flexographic inks, its application effects and the influence of related factors; the surface modification of mm-SiO2 powders is carried out by in-situ copolymerization of acrylic emulsions to form a The water-based flexo base ink is a well-matched mm-SiO2 acrylic copolymer emulsion, and then it is compounded with a mm-SiO2 acrylic copolymer emulsion and a water-based acrylic flexo ink, and a nano-water flexographic ink is finally obtained. Studies have shown that the nano ink's printability and print quality appraisal have been significantly improved, such as enhanced ink stability, excellent print transferability, clear printing dots, full color saturation, fast drying and highlighting; Has excellent water resistance, strong adsorption and good resistance to aging and other properties. The nano-water flexo ink not only has the green environmental protection of water-based ink, but also has the nano-functionality given by mm-SiO2, and is suitable for the decoration and printing of Dunkin flexographic printing on various objects such as paper and plastic.
2 Experimental development
Synthesis of 2.1 mm-SiO2 Acrylic Emulsion
mm-SiO2, acrylic acid, methyl methacrylate, butyl acrylate, styrene, coupling agent, complex emulsifier, ammonium persulfate, distilled water, sodium bicarbonate and ammonia water; electric mixer, temperature-controlled electric heating jacket, thermometer, A four-necked flask, a dropping funnel, and a condenser.
2.1.1 mm-SiO2 acrylic copolymer emulsion synthesis
According to the requirements of the assembly of reaction equipment, check the heating, stirring, temperature control and seal system is correct, the water, part of the emulsifier and mm-SiO2 powder, sodium bicarbonate and coupling agent were added to the four-necked flask, stirring and heating, Adjust the PH = 7.5-8.5; at the same time, the comonomer and the remaining emulsifier are pre-emulsified by stirring with a glass rod in a beaker; the initiator is additionally formulated as a 10% aqueous solution (the amount of water is included in the total composition of the emulsion system) to be used. When the reactor temperature rises to 85°C, heat for 1 hour, continue to heat up to 95°C, hold for 0.5 hour, wait until there is no reflux in the condenser, and when the temperature drops to 40°C, use ammonia to neutralize to PH=7.5~8.5. .
2.1.3 Technical Specifications of Nano-copolymerized Emulsion (See Table 1 for details)
2.2 Preparation of Aqueous Acrylic Based Ink
2.2.1 Main raw materials and equipment
Water-soluble acrylic resin, low-alcohol compound solvent, distilled water, monoethanolamine, ink pigments, defoamer; electric mixer, thermostat, thermometer, four-necked flask, dropping funnel, condenser, pre-dispersed container, sand Mill, coated -4 cup, fineness scraper.
2.2.2 Preparation of Aqueous Base Ink
The electric stirrer, thermometer, dropping funnel, condenser and four ports were assembled into a set and placed in a temperature-controlled electric heating jacket as a material feeding device. The lower alcohol compound solvent and water-soluble acrylic resin are added into the material device, and the condensing, stirring and heating are started. The temperature of the material is raised to 60° C., and the temperature is kept at 60° C.-65° C. for three hours, the system is uniform and transparent, and the temperature is reduced to 40° C. ~45 °C, drop of monoethanolamine, strictly control the feed rate, the system temperature should not exceed 70 °C, high-speed material PH = 8.5, at about 60 °C to continue insulation for 1 hour, adjust the viscosity of water production, to coat -4 cup viscosity measurement 30S It is a qualified water-soluble acrylic resin solution, which is ready for discharge.
Weigh the water-soluble acrylic resin solution, ink pigment filler, lower alcohol compound solvent, distilled water, and defoaming pre-dispersion container according to the formula weight, stir and wet the pigment powder with solid filler, pre-disperse, and stir until the system has no solid powder. , Into the sand mill for grinding and dispersing, grinding material temperature should not exceed 35 °C, measuring fineness of 20μm or less, viscosity of 60S, qualified water-based acrylic ink, discharge standby.
Table 1 Technical Specifications of mm-SiO2 Acrylic Copolymer Emulsion
Test items
Standard
Technical indicators
Exterior
Self test
Translucent lake blue emulsion
Solid content, %
GB/T2793-95
45-46
PH
GB/T9265-95
9
Drying speed, S
GB/T13217.5-91
5
Viscosity, S
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