Development of inkjet printer ink

1. Solvents In inkjet printing inks, solvents serve as carriers to play a decisive role in the performance of inks. Solvents are required to quickly dissolve colorants, binders, etc., and to have the right degree of volatility to effectively control the drying speed during inkjet printing. During the test, it was found that the use of two or more low-carbon-number ketones and alcohols as the solvent is best when mixed in a certain proportion, and the addition amount is about 70% to 90% of the total weight of the ink.

2. Regardless of the type of colorant colorant, it must have sufficient dissolving power in the solvent, and has good miscibility with other components in the ink, bright color, good weatherability and aging resistance. The experiment found that in addition to meeting the above requirements, organic chromium complex pigments also have good electrical conductivity in selected organic solvents and can provide a certain degree of electrical conductivity. The amount of colorant added in the ink accounts for about 3.0% to 8.0% of the weight of the ink in order to achieve the required color depth.

3. The adhesive binder is the main component of the ink-jet printing ink. Its role is mainly as a carrier for pigments to enhance the adhesion of the printing mark on the surface of the object. It is required that the binder be completely dissolved in the solvent and has good mutual solubility with other ingredients. After comparing the adhesion of the cellulose-based adhesive to the surface of the object, it is the preferred adhesive, and the amount added is from 5.0% to 10.0% of the total weight of the ink.

4. Conductivity regulators to meet the needs of electronic control, the ink requires a certain degree of conductivity, so the need to add conductivity regulators. In addition to the colorant providing a certain conductivity value, the ink also uses an ionizable organic or inorganic salt as a conductivity modifier, for example, tetramethylammonium acetate has better solubility in the selected solvent, and can provide Sufficient conductivity value is added in an amount of 0.5% to 2.0% of the total weight of the ink.

5, other additives in the ink also need to add some other additives to improve ink properties, such as adding 1.0% to 5.0% of anti-volatilizer to improve the stability of the ink, enhance the gloss of the printing mark, to prevent the inkjet nozzle Dry; N-methylpyrrolidone, glycol ethers, and phthalates were selected as anti-volatilizers. Another silane coupling agent is added to improve the adhesion of the adhesive to the surface of the substrate. The addition of a surfactant to reduce the surface tension increases the performance of the entire ink.