Commonly used solvents in gravure ink can be divided into the following categories:
Alcohol solvents: ethanol (alcohol), isopropyl alcohol, n-butanol
Ester solvents: ethyl acetate, butyl acetate
Benzene solvents: toluene, xylene
Ketone solvents: cyclohexanone, acetone, methyl ethyl ketone (butanone)
Since gravure ink is mainly based on volatile drying, most of them use highly volatile solvents.
In the ink solvent, we call the solvent that can dissolve the ink alone as the true solvent, the solvent that cannot dissolve the ink as the false solvent, and the solvent that cannot dissolve the ink alone and must be mixed with other solvents to dissolve the ink is called the cosolvent.
Among the solvents listed above, ethyl acetate, methyl ethyl ketone, acetone, toluene, and ethanol are all quick-drying solvents.
Such as butyl acetate, xylene, isopropanol, cyclohexanone are slow-drying solvents.
Benzene and other solvents cannot be used alone in benzene-soluble surface printing inks. Benzene solvents and alcohol solvents should be pre-mixed before diluting the ink. The ratio can be adjusted with reference to the information provided by the ink supplier.
In compound inks (chlorinated polypropylene type), benzene, ester and ketone solvents are all true solvents. Do not dilute with alcoholic solvents. In order to reduce costs, benzene solvents can be used, but depending on the drying speed, the ratio can be adjusted according to the information provided by the ink supplier.
In PVC shrink film inks, only ester solvents are true solvents, and benzene solvents are auxiliary solvents. Do not add benzene solvents alone, but mix ester solvents and benzene solvents. The proportion can be adjusted according to the information provided by the ink supplier.
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