In the composition of printing ink, it is often a polymer or condensate of some organic compounds. So today we will analyze some knowledge of the resin in the printing ink:
(1) Solubility and release of petroleum resin. Solubility refers to the ability of a resin to be dissolved in various solvents. In the manufacture of ink, the resin is generally used in a liquid state, so the solid resin must have a certain solubility to be used. Some resins that are already liquid also need to be dissolved in a solvent to reduce the viscosity before they can be applied due to excessive viscosity. Therefore, solubility is an important property of the resin.
The releasability refers to the ability to separate a solvent from a resin dissolved in the solvent. After the ink is printed, the solvent is separated from the resin, causing the resin to gel and dry. The release of petroleum resin is related to the solubility. The petroleum resin with good solubility is not conducive to the separation of solvent from the petroleum resin, so the release is poor. Because the petroleum resin is dissolved into a liquid state and released into a solid state, this conversion form is used in printing, so the solubility of the resin is required to have an appropriate degree to ensure that the solubility and release of the two aspects to achieve a good balance.
(2) the softening point of petroleum resin. The solid resin gradually softens with the increase of temperature, the plasticity increases, and then becomes liquid. The softening point refers to the temperature specified when the resin becomes a viscous liquid during the softening process, which is called the flow temperature, and the softening point increases with the increase of the relative molecular mass of the resin. In general, the higher the softening point of the resin, the stronger the solvent releasability. Especially the same chemical composition of the resin, this feature is more prominent. Therefore, the resin used in the ink should have a higher softening point.
(3) the viscosity of petroleum resin. Viscosity refers to the solution viscosity of the resin under certain circumstances, or dissolved viscosity. The viscosity of the resin is related to the relative molecular mass of the resin, solubility, solution temperature and solvent amount.
(4) Acid value of petroleum resin. Many of the resins used in ink are formed by condensation of organic acids such as resin acids, fatty acids, aromatic acids and other compounds. Therefore, there are many carboxyl groups that have not participated in the reaction in the resin, so that the resin has a certain acid value.
(5) the color and transparency of petroleum resin. The color of the resin is caused by a variety of pigment impurities in the resin, which is related to the nature, purity and synthesis process of the resin raw materials. The resin generally has a light yellow color.
The transparency is related to the moisture and other impurities mixed in the petroleum resin. The transparency affects the solubility of the resin, and a resin having a low transparency has poor solubility.

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