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1) Selection of aminating agents. The maleic anhydride addition rosin resin and acrylic resin contain the active carboxyl group (-COOH) on the molecular chain side, and this functional group can form a salt with the amine to give the water solubility of the resin. The reaction can be shown as:
R-COOH+NH3î ‡R...COO-NH+4 ​​Water soluble (formation process of aqueous binder)
R...COO+NH+4î ‡R-COOH+NH3 Water insoluble (ink drying process)
The amount and type of amine have a great influence on the hydration of the resin and the properties of the printed film after hydration. Ammonia, monoethanolamine, triethanolamine, N,N-dimethylethanolamine, etc. can be selected. Ammonia-water and ink-drying inks have a fast odor. Triethanolamine has a strong corrosion effect on flexo plates. Monoethanolamine is a common aminating agent for ink-based resins. . The higher the degree of neutralization, the greater the viscosity of the ink, the general control of pH = 7.5 ~ 8.5 is better.
2) Amination composite method
Studies have shown that the amination complex is first dissolved in maleic anhydride resin dissolved in a complex solvent, while adding amination agent and acrylic emulsion, stirring constantly, after the end of feeding, continue stirring and insulation, until the system is even and transparent, ready-to-eat Waterborne composite acrylic flexo ink binders.
3.2 Selection of Pigments and Additives
The color of the water-based ink is expressed by the pigment, and the pigment adapted to the ink preparation must be alkali-resistant and have good dispersibility. The most suitable is the use of high solids pigment filter cake, its coloring power can be increased by 5% to 15%, bright color, low viscosity, the system is stable and easy to disperse, but the cost is high. In order to reduce the cost, this experiment selected brightly colored organic pigments such as Lisol Red, Gold Red, Indigo, Indigo Green, Benzidine Yellow, Permanent Yellow, etc. White is selected from titanium dioxide, and black is selected from high-pigment carbon black. , Filler selection of colloidal calcium carbonate. At the same time, in order to improve the dispersion and stability of pigments, surfactants are usually added. The properties of inks are mostly adjusted by suitable additives, such as wetting and dispersing agents and defoamers.
3.3 Ink Product Test Results
The above-mentioned developed aqueous flexo inks were tested. The results are shown in Table 1. 
4 Conclusion
Developed functional acrylic emulsions and maleic anhydride-added rosin resins. In a mixed solvent system of water, a suitable amination agent was used to neutralize the two types of resins to form a water-based composite acrylic resin binder. This aqueous binder was used. It is formulated with high-quality pigments and fillers and carefully ground and dispersed to obtain a green, water-based flexographic printing ink with reasonable cost performance and suitable for decorating and printing.
Source: "Printing World"
Author: Cui Jinfeng
Development of Compound Acrylic Waterborne Flexographic Ink (Part 2)
3.1.3 Amination composites of aqueous binders