dye

The function of the dye is to give the ink sufficient color depth. The dyes used in the ballpoint pen ink can be divided into oil-soluble dyes and alcohol-soluble dyes. The dyes used in this test are phthalocyanine dyes, which are insoluble in solvents and have good dispersion in the ink. It has strong adhesion to the film forming agent, so that it does not penetrate into the paper, and the color should be bright and weather resistant.

Dispersant

A proper amount of dispersant can reduce the adhesion between the ink and the surface of the paper, so that the ink can be erased within a certain period of time when the ink is written on the paper surface. The dispersant can also maintain the ink's writing fluency and long-term stability. The material used in this experiment is a mixture of phthalate esters and glycol esters in a certain ratio.

Film former

The film forming agent is an important part of the erasable ballpoint pen ink. Its function is to form a uniform film on the surface of the paper and act as a carrier for the dye. It is required to have a certain degree of adhesion to paper, not easy to peel off, but it can be gently wiped off with an eraser, has strong adhesion to the colorant, has good solubility in solvents, and is stable with other ingredients, and can be stored for a long time . In this experiment, rubber film formers were used.

Solvent

In the erasable ball-point pen ink, the role of the solvent is to dissolve dyes, film-forming agents and to dissolve with various additives, provide a certain degree of fluidity, but also have the right volatility, and can effectively control drying during the writing process speed. Experiments show that the use of co-solvents is better than single solvents. In this experiment, a co-solvent system with solvent A: solvent B=1: 1.5 to 2.5 is used, which has the best effect.