2 Results and Discussion
2.1 Dispersion Resin, Film-forming Emulsion and Water-based Ink Performance Indicators
The composition of the monomer, the choice of initiator, and the synthesis conditions determine the molecular weight of the copolymer and the physicochemical properties of the ink film. The average molecular weight of the aqueous resin used in the aqueous ink is controlled within the range of 2000-5000. St homopolymer is a hard monomer, because it is too brittle to form a film alone; BA homopolymer is a soft monomer, because it is too soft and sticky and is not suitable for filming alone, only the organic combination of the two In order to achieve a satisfactory filming effect; AA homopolymer as a reactive monomer to provide carboxyl, amine imparted after the water-resistance given to the resin, high carboxyl content, although the polymer brings good water solubility, but the content is too high Affects the film-forming performance of aqueous inks, in addition, it also introduces -S03H to increase its hydrophilicity in the system.The MMA and St chain segments in the copolymer provide high hardness, good drying performance and water resistance for the ink film formation;BA The segment provides excellent flexibility and elongation for the ink film; N-methylol acrylamide as the self-crosslinking monomer gives the ink film a natural drying and excellent film-forming properties. The resin can be designed according to the composition of the monomer Vitrification Degree, a glass transition temperature of the copolymer according to the following formula ":
(to be continued)
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