Someone once asked me why the performance of water-based ink is inferior to that of oil-based ink. Regardless of brightness, physical properties, chemical resistance, water resistance and adhesion, oil-based inks are always superior. Do you think right?
If more than 30 years ago, this comment was correct; now, due to advances in science and technology, the performance of new water-soluble synthetic resins has improved, and some are even better than oil-soluble synthetic resins.
The synthetic resins used for the water-soluble inks are basically oil-soluble synthetic resins that are emulsified; they are actually of the same family and their properties are not significantly different; only one is soluble in solvents, the other is It can be diluted with water. The basic principle of the film formation is that the resin is formed into a thin film by the volatility and introgressibility of a solvent (water is also a kind of solvent) and adhered to the surface of the substrate.
EMULSIFYING, also known as DISPERSING, is the mixing of oil-soluble resin and water. At a certain pH, EMULSIFYING AGENT is used to disperse the resin into very fine and stable particles in water. A new emulsion resin (EMULSION RESIN). This emulsion is extremely stable and can be diluted with any proportion of water without the resin particles being repelled. Now many chemical plants have been able to produce various types of resin emulsions, such as N/C EMULSION, Vinyl Emulsion, ACRYLIC EMULSION, and POLYAMIDE EMULSION. , Epoxy emulsion (EPOXY EMULSION) and so on. Among them, acrylic resin emulsion and vinyl resin emulsion are commonly used emulsion resins in ink factories.
As we all know, the good and bad color ink performance is determined by the resin used, the condition of the resin conjunctiva and the thickness of the film. The mechanism of the oily ink conjunctiva is relatively simple; because the oil-soluble resin is basically dissolved in a solvent, the solution thereof is clear without any fine particles. When the solvent volatilizes and is absorbed, the resin in the solution forms a transparent film that adheres to the substrate.
The mechanism of water-based ink film formation is similar to that of oil-based ink. However, emulsion resins used in water-based inks do not dissolve in water, but only the resin turns into fine particles that diffuse in water. Therefore, after the water evaporates in space or is sucked away by the substrate, the particles of the emulsion resin form large particles due to their own attractive force (van der Pain attraction) and adhere to the surface of the substrate.
This large particle is very difficult to see with the naked eye. In addition, there is a large gap between the particles and the particles. Therefore, the dried film is not exactly the same as the film made of a solvent-based ink. Therefore, the mechanical and chemical properties are very poor. The light has a low reflectance and a large refractive index, so the light brightness is not good. Such factors often form water-based inks better than oil-based inks.
In order for a water-based ink to have good mechanical properties, chemical resistance, and high gloss as well as oily ink, it is necessary to improve the film formation of the water-based ink. In other words, after the water-based ink is dried, the emulsion resin particles in the ink must be tightly combined with each other to form a uniform, void-free film. This treatment method is chemically called COALEASENT.
If more than 30 years ago, this comment was correct; now, due to advances in science and technology, the performance of new water-soluble synthetic resins has improved, and some are even better than oil-soluble synthetic resins.
The synthetic resins used for the water-soluble inks are basically oil-soluble synthetic resins that are emulsified; they are actually of the same family and their properties are not significantly different; only one is soluble in solvents, the other is It can be diluted with water. The basic principle of the film formation is that the resin is formed into a thin film by the volatility and introgressibility of a solvent (water is also a kind of solvent) and adhered to the surface of the substrate.
EMULSIFYING, also known as DISPERSING, is the mixing of oil-soluble resin and water. At a certain pH, EMULSIFYING AGENT is used to disperse the resin into very fine and stable particles in water. A new emulsion resin (EMULSION RESIN). This emulsion is extremely stable and can be diluted with any proportion of water without the resin particles being repelled. Now many chemical plants have been able to produce various types of resin emulsions, such as N/C EMULSION, Vinyl Emulsion, ACRYLIC EMULSION, and POLYAMIDE EMULSION. , Epoxy emulsion (EPOXY EMULSION) and so on. Among them, acrylic resin emulsion and vinyl resin emulsion are commonly used emulsion resins in ink factories.
As we all know, the good and bad color ink performance is determined by the resin used, the condition of the resin conjunctiva and the thickness of the film. The mechanism of the oily ink conjunctiva is relatively simple; because the oil-soluble resin is basically dissolved in a solvent, the solution thereof is clear without any fine particles. When the solvent volatilizes and is absorbed, the resin in the solution forms a transparent film that adheres to the substrate.
The mechanism of water-based ink film formation is similar to that of oil-based ink. However, emulsion resins used in water-based inks do not dissolve in water, but only the resin turns into fine particles that diffuse in water. Therefore, after the water evaporates in space or is sucked away by the substrate, the particles of the emulsion resin form large particles due to their own attractive force (van der Pain attraction) and adhere to the surface of the substrate.
This large particle is very difficult to see with the naked eye. In addition, there is a large gap between the particles and the particles. Therefore, the dried film is not exactly the same as the film made of a solvent-based ink. Therefore, the mechanical and chemical properties are very poor. The light has a low reflectance and a large refractive index, so the light brightness is not good. Such factors often form water-based inks better than oil-based inks.
In order for a water-based ink to have good mechanical properties, chemical resistance, and high gloss as well as oily ink, it is necessary to improve the film formation of the water-based ink. In other words, after the water-based ink is dried, the emulsion resin particles in the ink must be tightly combined with each other to form a uniform, void-free film. This treatment method is chemically called COALEASENT.
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