The cause and solution of pigment bloating in paint printing pulp.

The color is like a red lotus. In the packaging tank due to the long storage time, the phenomenon of gas found on the shelves, there are several factors caused:
1, storage room temperature is high, resulting in physical changes.
2, anaerobic microorganisms produce

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chemical warehouse should be ventilated and cool, avoid direct sunlight and high temperature confinement.
In order to prevent thickening and bloating, the main improvement methods are as follows:
1, adjustment and control of particle surface polarity
resulting in water-based slurry storage stability bloating, mainly due to the polarity of the particle surface pre-dispersion medium of organic pigments Poor matching or compatible, if the pigment is treated with oil-friendly pine resin, especially when the amount is high, the polarity of the particle surface is reduced, and it is easier to separate from the dispersed medium when the coating slurry is colored, and the phenomenon of bloating is presented. That is, pigment particles gather with each other, and the colorants precipitate and precipitate from the dispersed medium.
2, adjust the molecular weight of the dispersant
coating color slurry preparation process to improve the stability of the dispersant, the selection of additives should pay attention to the molecular weight of the additive, the molecular weight of additives, especially the fat chain is longer, and has a branch chain additive according to its principle of spatial barriers to help prevent pigment particle accumulation.
3. Treatment of pigments with surfactants with strong hydrophobicity or high HLB value can improve the stability of dispersions in water-based media, or the coating treatment of pigments with hydrophobic acrylic monosomes can prevent swelling.
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