Abstract
As an environmentally friendly coating, waterborne coatings have broad application prospects in paper packaging products in food and medicine. In this paper, a waterborne coating is synthesized from epoxy resin, polypropylene glycol diglycidyl ether, acrylic acid, trimellitic anhydride, maleic anhydride, and organic amine by three steps: ring opening reaction, esterification reaction, and neutralization reaction. Using viscosity, particle size, thermal stability, adhesion, and friction resistance as performance evaluation factors, the effects of the ratios of epoxy resin and polypropylene glycol diglycidyl ether in the polymerization system on the performance of synthetic waterborne coatings were discussed. Taking water solubility, water absorption, and water resistance as performance evaluation factors, the effects of the amount of ratio of anhydride groups to hydroxyl groups in the epoxy acrylic resin, which were produced in the second step of the reaction, were considered on the performance of synthetic waterborne coatings. The experimental results showed that when the molar ratio of the epoxy group in the epoxy resin and polypropylene glycol diglycidyl ether was about 1:1, and the molar ratio of anhydride in maleic anhydride to hydroxyl in the epoxy acrylic resin generated in the second step of reaction was about 0.9:1, the performance of the prepared waterborne coatings was comprehensively better. At the same time, the applicability of self-made waterborne coatings was tested. The results showed that when the coating amount was about 3.60 g/m2, the properties of the packaging base paper were greatly improved with respect to air resistance, oxygen resistance, oil resistance, and color reproducibility.
Highlights
Packaging paper has the advantages of certain stiffness, good printability, low cost, and environmental friendliness; it is widely used in the fields of food and some specific packaging [1,2]
In order to test whether the prepared coatings could achieve spreading and absorption on the packaging base paper, this experiment tested the wettability of the self-made waterborne coatings in the form of an inkjet, which would help to observe the spreading effect on the paper
The experimental results showed that the performance of the waterborne coating was better when the epoxy molar ratio of epoxy diluent (ED) and E51 was 1:1, which resulted in a viscosity that was suitable for inkjet printing and an average particle size of less than 0.2 μm
Summary
Packaging paper has the advantages of certain stiffness, good printability, low cost, and environmental friendliness; it is widely used in the fields of food and some specific packaging [1,2]. Digital inkjet technology can make the coatings spray from the nozzle to the materials, which are coated under the control of the computer It can make the coating by the coating process in the form of fields or graphic shapes. In order to ensure that the waterborne coatings prepared in the experiment can be used in the form of spraying, this experiment tested the properties of the waterborne coatings prepared, and adjusted the preparation formula to make it suitable for the inkjet system. In order to test whether the prepared waterborne coatings can meet the requirements of service performance, the related properties of packaging paper before and after coating were tested, to verify whether the properties of packaging paper were improved after the paper was coated. The online coating, printing, and decoration of the packaging base paper could be conducted simultaneously, which would avoid the cumbersome process of coating the base paper first and changing the machine for decoration and printing
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