Thixotropy refers to the ability of a liquid to recover its original viscosity due to a decrease in the stress viscosity. In the silk screen printing process, the ink is thickened after standing for a certain period of time, the viscosity becomes large, and the ink becomes thin after stirring, and the viscosity also becomes a reversible phenomenon. Because the shape of the pigment particles in the ink is irregular, it is an irregular sphere even though it adsorbs a layer of binder. Therefore, after a certain time of standing still, the pigment particles will come into contact with each other or come close to each other, causing mutual attraction, hindering the free movement of the particles, and the ink will become thick and sticky. However, this temporarily stable structure, after being stirred by an external force, is quickly destroyed, releasing the mutual attraction between the particles, recovering the free movement of the particles, improving the fluidity, thinning the ink, and lowering the viscosity.
The thixotropy of screen printing ink is as small as possible. To eliminate this unfavorable factor, the ink must be fully agitated before printing to return it to its normal state and then printed.
The more woody pigment particles in the ink, the more porous, such as black ink, the thixotropy is large. On the contrary, if yellow ink, its thixotropy is small. There are many binders in the ink, less pigment, and less thixotropy, and vice versa. In addition, different materials have a great influence on thixotropy. For example, inks made from polymerized vegetable oils have small thixotropy, such as polymer resin as a binder, which has a high thixotropy.
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