Protective printing ink for hardware etching

Abstract

The invention discloses protective printing ink for hardware etching and relates to the technical field of printing ink. The acrylic resin with the acid value of about 50-70, the molecular weight of 40000-60000 and the TG value of 90-105 is synthesized in a mode of performing solution polymerization on an organic solvent and an acrylic monomer. The protective printing ink comprises the following components in percentage: 25-60 percent of thermoplastic carboxyl acrylic resin, 20-50 percent of an organic solvent, 20-40 percent of talc, 0.2-2 percent of bentonite, 0.5-2 percent of pigments and 1-5 percent of fumed silica. A uniform film layer with good corrosion resistance can be formed on a nonplanar irregular metal product by adopting a spraying mode and can be well washed out by using dilute alkali solution, and the printing ink can be uniform in film formation with other electrophoretic paint and is environment-friendly.

Description

Technical field: [0001] The invention relates to the technical field of inks, in particular to a protective ink for metal etching. Background technique: [0002] With the refinement of electronic products, there are more and more fine pattern etching products of hardware. Any mid-to-high-end electronic products and many daily-use products around have metal etching products. At least 4-6 metal etching workpieces like a smartphone. In the past, most of these products used electrophoretic paint to form a film, then used a laser to remove the ink on the etched part, and then etched the exposed metal with an aqueous solution of ferric chloride and hydrochloric acid. Finally, nitric acid is used to carbonize and dewash the paint film, so that the cost of electrophoresis and the cost of dewashing are very high, and the highly volatile nitric acid used for dewashing will cause great damage to the operators, workshop environment, metal equipment, and atmosphere. Moreover, the film...

AI Technical Summary

Problems solved by technology

Finally, nitric acid is used to carbonize and dewash the paint film, so that the cost of electrophoresis and the cost of dewashing are very high, and the highly volatile nitric acid used for dewashing will cause great damage to the operators, workshop environment, metal equipment, and atmosphere

Moreover, the film formation of electrophoretic paint is not uniform, which brings a lot of troubles to the processing, such as the problem of low yield due to non-resistance