The hottest water-based ink green environmental pr

Water based ink: green environmental protection (I)

development of water-based ink

as early as the 1960s, people began the research and application of water-based ink. Due to the requirements of environmental protection and the shortage of petroleum raw materials, some developed countries gradually restrict the use of petroleum products to manufacture printing inks. Therefore, people began to study non organic solvent based inks, which made great progress and development of water-based inks. At first, dextrin, shellac, casein, sodium lignate and other substances were mainly used as the connecting materials of water-based inks, and the prepared water-based inks were mainly used for the printing of some low-end products

in the late 1960s, with the development of material science, the synthesis technology of rosin and maleic acid modified resin succeeded, replacing casein, shellac and other materials, and became the main material of water-based ink, which could basically meet the printing needs at that time. However, these primary products still have some disadvantages, such as poor gloss, poor water resistance, poor adhesion, easy foaming, poor storage stability, etc. Later, people called the water-based ink produced at this stage as the first generation of products

in the 1970s, due to the oil crisis, the raw materials for printing ink were once again in great tension. At the same time, developed countries legislated to control air quality, restrict the emission of organic volatile compounds (VOC) into the atmosphere, and restrict the content of heavy metals and residual solvents in packaging and printing products with strict sanitary conditions such as food, beverages and drugs. Ink R & D personnel from various countries continued to conduct in-depth research and produced the second generation of water-based inks with solution styrene acrylic copolymer resin as the binder. This product makes up for the poor water resistance and storage stability of the first generation of water-based inks, but it still lags behind solvent based inks in gloss and printability. Therefore, based on the second generation of water-based inks, the ink R & D personnel introduced acrylic monomers to polymerize with styrene, and developed a polymer lotion resin with core-shell structure and shape structure. This series of resins has greatly improved the gloss and dryness of ink, promoted the development of water-based ink, and continuously widened the competitive field of water-based ink with solvent based ink. Water based ink has entered a new development period

in China, water-based inks were mainly used for gravure printing. At that time, the intaglio printing ink was improved from benzene solvent to gasoline based solvent, although it was less toxic than benzene based ink, but the flammability was not improved. Therefore, someone proposed to improve gravure printing ink into non-toxic and non combustible water-based ink, which was called water-based ink at that time. Because the ink is mainly composed of rosin acid amine salt, and the connecting material is unstable in the storage of water medium, it is easy to lose light and alkene, and the dryness and water resistance of the ink are poor during storage, which is easy to cause paper shrinkage and other disadvantages. This restricts gravure printing and flexographic printing in our country, and we have to use imported high-grade water-based inks. Due to the high price of imported inks, the printing cost has increased invisibly, which limits the development of China's printing industry

the series of water-based ink products developed later have the characteristics of non-toxic, non irritating smell, non corrosive, non flammable, non explosive, good use safety, etc. The ink series can be widely used in the printing of gold, silver paperboard, coated paper, whiteboard, corrugated paper, self-adhesive paper, cartons, paper packaging bags, books and magazines, etc

research and development of water-based inks

water-based inks are referred to as water-based inks, and flexible water-based inks are also known as liquid inks. They are mainly made of water-soluble resins, organic pigments, solvents and related additives through compound grinding. Water based ink is especially suitable for packaging and printing products with strict sanitary conditions, such as tobacco, wine, food, beverages, drugs, children's toys, etc

1. Water soluble resin

water soluble resin or water dispersible resin are the connecting materials of water-based ink, which have a great impact on the viscosity, adhesion, gloss, drying and printing adaptability of the ink. In China, rosin modified maleic acid resin is often used as the connecting material to make ink, but this kind of ink can only be used to print ordinary cartons. The coherence coefficient between the full experimental curve and the theoretical fitting curve reaches more than 99%, which cannot meet the requirements of gloss and water resistance required by medium and high-end packaging and printing. The stability of ethyl carbamate resin is good, but the printing adaptability and solubility are slightly poor. Others include styrene modified maleic acid resin, waterborne amino resin, polyvinyl alcohol and carboxymethyl cellulose. These polymer resins generally contain hydrophilic groups such as - COOH (carboxyl), - Oh (hydroxyl), - NH2 (amino) and become completely water-soluble resins after specific process treatment, It can be used as the binder of water-based ink. However, there are still some unsatisfactory aspects, which have different effects on the printing adaptability, gloss and water resistance of water-based inks (see Table 1)

maleic acid resin urethane resin

aqueous amino resin carboxymethyl cellulose water-soluble acrylic resin pigment dispersion medium good excellent printing adaptability medium medium good excellent wet friction resistance medium good medium excellent dry friction resistance poor medium poor medium excellent ink stability medium good medium excellent heat resistance poor medium excellent water resistance poor medium poor colorability medium poor medium good gloss poor Choose the experimental machine with superior performance and good quality