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What pigments will swell in pigment printing paste
Release time:
2024-01-17
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Pigment printing paste is a mixture of water, pigment, dispersant and so on. The container is not completely closed or not filled with barrels, and part of the solvent is used during storage to concentrate and thicken the slurry, and oxygen in the air can also promote gelation. In the process of environmental protection coating storage, the storage temperature is too high and the time is too long, which will also cause the coating to gel.
Pigment printing pasteby water,Pigments, dispersant and other components of the mixed material. The container is not completely closed or not filled with barrels, and part of the solvent is used during storage to concentrate and thicken the slurry, and oxygen in the air can also promote gelation. In the process of environmental protection coating storage, the storage temperature is too high and the time is too long, which will also cause the coating to gel.
The coating looks thick in appearance, but once mechanically stirred, it can flow freely and can restore the original phenomenon after stopping stirring. The paint is too thick to stir. The phenomenon of a gelled coating changing from a liquid to an unusable solid or semi-solid state. Because the fine particles of the pigment form a block of granular, jelly-like, called pseudo-thick or thixotropic.
paint pasteThe main reason for the viscosity is the usePigmentsReacts with binder resin. Such as high acid value paint and base pigments in the storage process from the saponification reaction, mutual attraction and neutralization, causing gelation and solidification. Mainly present in the paint containing high pigment composition, and talcum powder, zinc oxide, lithopone, red Dan powder and so on the most obvious.
In order to prevent thickening and swelling, the main ways to improve are as follows:
- Adjusting and controlling particle surface polarity
leadwater-based color pasteStorage stability increases, mainly dueorganic pigmentThe polarity of the particle surface and the polarity of the dispersion medium match or compatibility is poor, if the pigment is treated with oleophilic rosin resin, especially when the amount is higher, the particle surface polarity is reduced, for coating color paste coloring is more easily separated from the dispersion medium, and the phenomenon of swelling. That is, the pigment particles are aggregated with each other, and the colorant is precipitated and precipitated from the dispersion medium.
- Adjust the molecular weight of the dispersant
Additives are added to the coating color paste manufacturing process to improve the stability of the dispersant. The selection of additives should pay attention to the molecular weight of the additives, and the additives with higher molecular weight, especially the additives with longer fatty chain and branched chain, help to prevent the aggregation of pigment particles according to the principle of space barrier.
③ with hydrophilic strong or high HLB value of surfactant treatment of pigment, can improve the dispersion stability in aqueous medium, or the use of hydrophilic acrylic monomer coating treatment of pigment, can prevent swelling phenomenon.
In addition, when the water quality or the PH value of the pigment is acidic, it is easy to produce bacteria 2, which also causes agglomeration and precipitation, and in severe cases, agglomeration and swelling.
Key words:
Pigments, Paints, Paint Paste, Organic Pigments
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