1. The influence of polymer monomers on the glossiness of water-based Overprint Varnishes The polymer monomers selected for the film-forming resin in the water-based varnish formulation have a significant impact on the glossiness of the finished product. In actual production, multiple monomers are usually used for copolymerization. The acrylic resin used in water-based varnish can be made from monomers such as methyl methacrylate, styrene, acrylic methyl ester, acrylic β-hydroxypropyl ester, and acrylic. Increasing the dosage of methyl methacrylate and styrene leads to a harder coating with good glossiness, but it is also more brittle and has poorer flexibility and solubility resistance. 2. The proportion of water-soluble resins and emulsions in the varnish formula Increasing the dosage of emulsions can enhance the glossiness of the varnish, but it will reduce the leveling and processing suitability of the varnish; increasing the dosage of water-soluble resins can improve the leveling and processing suitability of the varnish, but the glossiness will decrease. 3. The influence of leveling on the glossiness of water-based varnish Leveling is an important factor affecting the glossiness of water-based varnish. Leveling is influenced by product viscosity, pH value, and surface tension. Choosing an appropriate leveling agent can effectively improve the construction leveling performance. If the varnish has good leveling, it can quickly level before the coating dries, forming a smooth surface, and the coating will have high glossiness; if the varnish does not dry before leveling, it will leave some streaks, sand holes, etc., reducing the glossiness. 4. The influence of pH value on glossiness The pH value of water-based varnish should generally be controlled between 8 and 9. The pH value is mainly adjusted with ammonia water. If the pH value is too high, the viscosity of the varnish will decrease, affecting the glossiness and causing a slower drying speed and poorer water resistance; if the pH value is too low, the viscosity will increase, and ammonia water will volatilize relatively quickly during leveling, causing the leveling process to end prematurely and affecting the final film formation glossiness. 5. The influence of viscosity and solid content of the finished product on glossiness The viscosity of the finished product has an important impact on the leveling, wetting, and other properties during coating application. The surface of the printed product has a certain absorption capacity for the varnish, and the absorption rate of the printed surface for the varnish is proportional to the viscosity value of the varnish. If the viscosity value of the varnish is too small, when coating on paper with a high absorption rate, it will cause too large a change in the viscosity of the varnish during leveling, resulting in premature ending of leveling, causing uneven coating on the surface of the printed product, and affecting the smoothness and glossiness o...

1. The influence of polymer monomers on the glossiness of water-based Overprint Varnishes The polymer monomers selected for the film-forming resin in the water-based varnish formulation have a significant impact on the glossiness of the finished product. In actual production, multiple monomers are usually used for copolymerization. The acrylic resin used in water-based varnish can be made from monomers such as methyl methacrylate, styrene, acrylic methyl ester, acrylic β-hydroxypropyl ester, and acrylic. Increasing the dosage of methyl methacrylate and styrene leads to a harder coating with good glossiness, but it is also more brittle and has poorer flexibility and solubility resistance. 2. The proportion of water-soluble resins and emulsions in the varnish formula Increasing the dosage of emulsions can enhance the glossiness of the varnish, but it will reduce the leveling and processing suitability of the varnish; increasing the dosage of water-soluble resins can improve the leveling and processing suitability of the varnish, but the glossiness will decrease. 3. The influence of leveling on the glossiness of water-based varnish Leveling is an important factor affecting the glossiness of water-based varnish. Leveling is influenced by product viscosity, pH value, and surface tension. Choosing an appropriate leveling agent can effectively improve the construction leveling performance. If the varnish has good leveling, it can quickly level before the coating dries, forming a smooth surface, and the coating will have high glossiness; if the varnish does not dry before leveling, it will leave some streaks, sand holes, etc., reducing the glossiness. 4. The influence of pH value on glossiness The pH value of water-based varnish should generally be controlled between 8 and 9. The pH value is mainly adjusted with ammonia water. If the pH value is too high, the viscosity of the varnish will decrease, affecting the glossiness and causing a slower drying speed and poorer water resistance; if the pH value is too low, the viscosity will increase, and ammonia water will volatilize relatively quickly during leveling, causing the leveling process to end prematurely and affecting the final film formation glossiness. 5. The influence of viscosity and solid content of the finished product on glossiness The viscosity of the finished product has an important impact on the leveling, wetting, and other properties during coating application. The surface of the printed product has a certain absorption capacity for the varnish, and the absorption rate of the printed surface for the varnish is proportional to the viscosity value of the varnish. If the viscosity value of the varnish is too small, when coating on paper with a high absorption rate, it will cause too large a change in the viscosity of the varnish during leveling, resulting in premature ending of leveling, causing uneven coating on the surface of the printed product, and affecting the smoothness and glossiness o...

At present, water-based inks are mainly used for flexible and recessed plate printing. Among these, most of them are used in food packaging, tobacco and alcohol, pharmaceutical factories, and children's toys, occupying a considerable market share. Composition of water-based inks Water-based inks are made by compounding and grinding water-based resins, pigments, and solvents. Water-soluble resins mainly play the role of a binder in the ink, enabling the pigment particles to be uniformly dispersed, making the ink have certain fluidity, generating adhesion to the substrate material, and forming a uniform film layer after printing. Characteristics of water-based inks 1. Water-based inks are a new type of environmentally friendly printing ink with good adhesion, excellent flexibility, good elasticity, anti-retraction, water resistance, excellent printing performance, overprinting performance, and high solid content. 2. They are non-flammable, have stable ink properties, do not corrode the printing substrate, prevent color migration, have strong water resistance, dry quickly. They can not only reduce the hazards caused by static electricity and flammable solvents, but also reduce the toxicity of the printed surface residues. Moreover, cleaning the printing equipment is very convenient, so they are particularly suitable for the packaging industries of food, beverages, and pharmaceuticals. 3. The solvents of water-based inks are water and a small amount of alcohols. They have wide applications in the printing industry of T-shirts and other pure cotton and elastic fabrics, shoe insoles, etc. The usage instructions for water-based inks Applicable screen mesh: 40-100T (water-based silk screen plates) Applicable scraping: It is recommended to use 65-70 degree polyester scraping or water-based special scraping Coating area: 25-35 square meters per kilogram Sizing agent: Neutral water Washing agent: Ordinary tap water Requirements for mixing water-based inks Before use, the viscosity of the ink needs to be adjusted appropriately according to different printing requirements. When adjusting, pay attention to adding water as much as possible to be neutral to slightly alkaline, otherwise it will affect the viscosity and drying speed of the water-based ink. At the same time, the amount of diluent (water) added cannot exceed 3%, otherwise the color concentration of the ink will be reduced. Requirements for printing with water-based ink. Due to the characteristics of water-based ink, it is difficult to control the drying speed. Therefore, it is suitable for rapid printing. If the printing speed is too slow, it is likely to cause the ink to dry quickly on the screen plate and block the water. Requirements for drying of water-based ink. Water-based ink mainly dries naturally, but after printing, it is better to let it dry for 8 hours in the natural environment and then bake it for about 1 minute at 130 degrees. Usage of water-based ink additives Slow-drying agent: Used...

Water based acrylic resin has many applications. Today, let's talk about one of them - water-based ink. 1. Water-based ink and solvent-based ink As is known to all, water-based ink has the advantages of being environmentally friendly, non-toxic, without irritating odors, and without corrosiveness. During use, it can be diluted directly with tap water, and is harmless to the environment and human body. However, solvent-based ink has high image quality durability during printing. Its field is in the large-format and wide-format markets. The evaporation of solvents is more likely to cause certain pollution to the environment compared to water-based ink. water-based ink solvent-based ink Solvent Inorganic solvents (water) organic solvent Smell Low odor and non-toxic Stinky odor, toxic Applicable for printing Flexographic printing, intaglio printing Offset printing is the main method Water-based inks inherently meet environmental protection requirements. They have specific advantages such as being non-toxic, having no irritating odor, non-flammable, non-explosive, and convenient for transportation and storage. Currently, they are gradually taking market share from solvent-based inks. As environmental protection becomes increasingly strict, this rate of cannibalization will accelerate further. Water-based inks are made from water-soluble resins, water-based pigments, additives, and solvents. The additives generally include: defoaming agents, pH stabilizers, etc. Secondly, water-based inks are also divided into many types. The following are some examples: 1. Special water-based ink for food soft packaging laminated printing; 2. Special water-based ink for plastic surface printing; 3. Special water-based ink for soft PVC printing; 4. Special water-based ink for PVC heat shrink film printing; 5. Special water-based ink for PET heat transfer printing; 6. Special water-based ink for hygiene packaging materials printing; 7. Water-based plastic screen printing ink, etc. Thirdly, let's introduce a specific water-based plastic ink. BA Seriesis a room-temperature self-crosslinking acrylic modified resin, specially designed for water-based plastic inks. The product is easy to use and does not require a drying tunnel, meeting the drying requirements of various printing machines. Features: - Good leveling, wetting and adhesion - Good dispersion of pigments - Good transparency of film formation - High glossiness - Fast drying, etc. Application scope: Suitable for the manufacture of water-based inks on various plastic substrates (such as PVC, PET, BOPP, etc.). Main product indicators: Appearance: Light yellow transparent liquid pH value: 7.0 - 9.0 Viscosity (tested by rotor viscometer): ≥ 2000 mpa Glass transition temperature: Approximately 17℃ Usage method: Water-based acrylic resin can be adjusted in viscosity and drying speed by using alcohol or alcohol ether type solvents (such as propylene glycol methyl ether, isobutanol, ethanol, methanol, etc.). The dosage can...