The difference between neutral ink and general ink is that it is not only fluent, but also has a certain lubricity. The addition of lubricant reduces the friction between the ball and the seat, minimizing kinetic energy for a more comfortable writing feel. Solving the problem of lubricity of ink is also a comprehensive complement of the system. It is characterized by the presence of more polar additives and solvents, and at the same time it is necessary to make a reasonable combination of surface activity and lubricant, because the two are particularly tight, and the one that forces the side will affect the effect of the ink. .
The key to the lubricity of neutral inks is to have lubricants to cooperate. In the pursuit of lubricants, mainly use large-molecular-weight lubricants or greases, supplemented with additives and surfactants, and reasonably cooperate to obtain better results. . Neutral inks are highly viscous, so the additives and solvents used should be mainly alcohols and organic ethers with high polarity and particularly strong wetting effect, so as to effectively break the pulling force of the ink fabric. The organic solvent suitable for pigment dispersion or the like may be selected, or a certain amount of surfactant may be added to adjust the intermittent performance, continuous writing performance and ink discharge amount of the ink.
Ensuring good ink stability is one of the most critical technologies for neutral inks. Firstly, it is necessary to ensure that the pigment is highly effectively dispersed, and that the highly dispersed pigment is promoted to be stable without re-polymerization, and at the same time, it is necessary to overcome the entrapment of the pigment by the colloid in the neutral ink, so that the reasonable dispersion of the pigment is destroyed, which is a The stability of the system is guaranteed. According to the unique characteristics of the pigment, the raw materials with suitable color, loose particles, small degree of polymerization and easy dispersion are selected as the color base of the ink, and the dispersed abrasive pigment is the first step to ensure the stability of the ink, and is also important for the manufacture of neutral ink. Link.
The color paste used is also a dispersion system, and there is a tendency to be unstable in itself. When the dispersant which is wrapped or adsorbed by the pigment particles is damaged by other substances or the charge property is impaired, the pigment particles are easily produced when they are pulled by external force. Unstable conditions such as aggregation, sedimentation, and even sedimentation between particles.
The thickener dissolves in water and forms a system with other solvents and auxiliaries. When this system and the color paste system are miscible, there is a problem of compatibility with the color paste system. Causes the existence of neutral ink stability problems.