How to choose and quantify the mixed solvent for ink after being familiar with and mastering the solvent's dissolving power, volatilization speed, surface tension and other properties? This article elaborated the formula design principle of gravure mixed solvent.
1. Choose the solvent or mixed solvent that can dissolve the resin through the dissolution parameters
According to the mechanism of action, the solvent is divided into true solvent, false solvent and auxiliary solvent. Among the solvents for plastic gravure inks, the solvent that can dissolve the ink alone is called the true solvent; the solvent that cannot dissolve the ink is called the false solvent; the solvent that cannot dissolve the ink alone but must be mixed with other solvents to dissolve is called the cosolvent. Adjusting the balance between the real solvent, the fake solvent, and the co-solvent can achieve the expected dissolving power, volatilization speed and viscosity. The dissolving power of the mixed solvent should not be too strong. If it is too strong, the solvent release rate will be slow; if it is too weak, the resin will not be fully dissolved, affecting the plastic gravure ink and printing quality.
The volatilization of mixed solvents is generally non-ideal liquid volatilization. If the proportion of true solvent in the residual solvent is reduced, the dissolving power will be weakened, the wet film will be in a poorly dissolved state, or even insoluble, and there will be phase separation and whitening of the ink film. Therefore, the amount of fast, medium and slow volatile components in the mixed solvent formula should be balanced, and the distillation curve of the mixed solvent should also show a balanced upward trend, and the volatilization process of the gas phase composition and liquid phase composition of the mixed solvent at ambient temperature should be kept consistent , So that the mixed solvent has good solubility.
Second, establish a solvent or mixed solvent volatilizer map
If you don't know the volatility relationship graph of the solvent or mixed solvent with time and temperature, you should usually choose several mixed solvents with different volatility to test, in order to establish its volatility profile, and provide a reference for the choice of solvent or mixed solvent.
3. Choose several solvents or mixed solvents to combine into multiple formulas, and then determine the best formula through comparative experiments
Sometimes it may be necessary to adjust the composition and amount of the mixed solvent in a small range to improve the performance of one aspect of the ink, and finally obtain a mixed solvent that meets the performance requirements of all aspects of the plastic gravure ink.
Fourth, optimize the solvent or mixed solvent ratio to meet the solubility and other properties of the resin
On the premise of ensuring that the mixed solvent has sufficient dissolving power, appropriate volatilization speed, appropriate viscosity and surface tension, an effective, inexpensive, and low-toxic solvent should be selected, which can effectively dissolve the resin and disperse the pigment to meet the ink film. Performance requirements, and can reduce solvent costs.
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