At present, with the widespread adoption of water-based ink, the market share is increasing. Due to the continuous improvement of people's environmental awareness, the goal of environmental protection printing has been promoted, and the water-based ink is safe and non-toxic, no volatile organic gases, no combustion, no explosion and many other environmental characteristics are highly respected. "Green printing, safe printing, healthy printing" is becoming more and more popular today, water-based ink will be more widely used and have a wider market share. Water-based ink is commonly known as ink, water-based ink is mainly suitable for packaging and printing products with very strict sanitary conditions such as common in daily life: beverages, food, medicines, children's toys, tobacco and alcohol, and so on. Flexographic water-based ink is also known as liquid ink, which is mainly composed of soluble resins, organic pigments, solvents and related additives through composite grinding processing.
 
1. the water-based ink raw material pigment gives the ink color characteristics, meet the printing color requirements.
 
General organic and inorganic pigments can be used for water-based inks. Since the resins of water-based inks are mostly alkali-soluble, it is necessary to use alkali-resistant pigments when selecting pigments. However, the distribution density of pigments in ink is much larger than that of solvent-based inks, and the surface tension and polarity of water are different from that of solvents, making pigment dispersion more difficult, which directly affects the stability, viscosity and pH value of ink. The addition of surfactants can increase the affinity between resin and water and the affinity between pigment and water-soluble binder, so as to solve the problem of ink stability. The viscosity and pH value of ink need to be precisely controlled. When the pH value is higher than 9.5, the alkaline is too strong, the viscosity of the ink will be reduced, the drying speed will be slow, and the water resistance will be poor; When the pH value is lower than 8, the alkaline is too weak, the viscosity of the ink is increased, the drying speed is accelerated, and the defects such as dirty plate, paste plate and foaming will be caused. When selecting pigments in the printing process, the advanced pigments with bright color, low viscosity and stable system in domestic pigments should be selected to make water-based inks.
 
2. water-based ink formula obtained through practice water-based ink excellent basic formula
 
Water-soluble acrylic resin 25% ~ 35% water 15% ~ 25% ethanol 5% ~ 15% triethylamine 5% ~ 10% pigment 10% ~ 30% additives 1% ~ 3% Three, water-based ink additives in order to improve the performance of water-based ink need to add a variety of additives, and water-based ink additives are more important than solvent-based ink.
 
3.the commonly used water-based ink additives are the following:
 
① Defoamer: used to eliminate the foam in water-based ink, the amount is generally 1% to 2%.
② Stabilizer: mainly to prevent ink in storage, transportation, agglomeration, mildew, reduce the viscosity of ink and adjust the pH value of ink, generally use ammonia or ethanolamine and other additives.
③ Other additives: dispersants, preservatives, leveling agents, slippery agents and crosslinking agents, etc. Through the scientific use of these additives to improve the weakness of water-based ink, can improve the stability of water-based ink.

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