White board pen ink and its making process

Abstract

The white board pen ink has the recipe comprising pigment 3.5-5.0 %, uncapping agent 1.0-5.0 %, alcohol 48.0-71.0 %, propanol 15.0-25.0 %, erasing agent 5.0-10.0 %, resin 3.5-5.0 %, and dispersant 1.0-2.0 %. Its making process includes the following steps: mixing all the materials via stirring, grinding for 20-30 hr to reach pigment granularity of D50=120-200 nm, and discharging. The white board pen ink has fluent writing and high storage stability, is suitable for writing on white board, glass, plastic product, etc, and may be fitted to various kinds of pens.

Description

technical field [0001] The invention relates to a whiteboard pen ink, in particular to a nanoscale pigment type whiteboard pen ink and a manufacturing method thereof, belonging to the technical field of ink. Background technique [0002] Whiteboard pens are a new category of products developed by the pen industry in recent years, and the matching whiteboard pen inks basically rely on imports. At present, the high-end special inks sold on the market are all made of dye-type inks, and the dye components are easy to crystallize, resulting in uneven ink output and poor writing; they are toxic and not environmentally friendly. Material type change. The disadvantages of dye-based whiteboard pen inks are: [0003] Pigment-based whiteboard pen ink is based on the dispersion of pigment particles in the ink system to achieve the effect. Ordinary pigment-based whiteboard pen ink has large pigment particles and poor dispersion effect, which directly affects writing. A kind of nanosc...

AI Technical Summary

Problems solved by technology

However, as the particles become smaller, the specific surface area will increase greatly, the van der Waals gravitational force between the particles will become larger, and the particles will easily condense, which will lead to deterioration phenomena such as stratification and precipitation during storage.

It is difficult for the general process technology and equipment to make the pigment particles in the ink system achieve initial nanometerization, and it is difficult to maintain good dispersion stability

Furthermore, maintaining the stability of low viscosity is another important index. If the viscosity is too high, the amount of ink output will become smaller, resulting in poor writing, thread breakage, wire drawing, etc.; if the viscosity is too small, ink leakage will occur. Viscosity is another technical problem of whiteboard pen ink