A laboratory systematically studied the effect of the synergistic effect of wax asphaltene content on ethylene-vinyl acetate (EVA) copolymer resin stabilized asphaltene on the improvement of model wax oil fluidity, proposed the corresponding mechanism.

In this paper, the effect of EVA foam vinyl acetate (VA) content (12-40 wt%) on the synergistic performance of EVA asphaltene was studied to develop improve the synergy theory.

The results show that Kunshan Carton Factory explained that different VA content has little effect on the rheological properties of pure EVA model wax oil, but it plays an important role in improving the flow properties of EVA model wax oil asphaltene model wax oil. EVA with a medium VA content (28 wt%) has good flow improvement efficiency in pure EVA PPD, but it is related to asphaltenes. EVA with a higher VA content (33 wt%) has a better effect.

Through the differential scanning calorimetry (DSC) test, when the VA content is low medium (12-33 wt%), the wax precipitation temperature (WPT) of the wax oil after adding pure EVA decreases, while the VA content is too high (40 wt%) %) EVA is the opposite. Ethylene-vinyl acetate/asphaltene has no further inhibitory effect on the hydration temperature of oil, but ethylene-vinyl acetate/asphaltene can promote the crystallization of paraffin wax accelerate the precipitation process of wax crystals below the hydration temperature. Increasing the polarity of EVA (12-33 wt%) can enhance the polar interaction between EVA asphaltene in the oil phase, promote the adsorption of EVA molecules on the asphaltene aggregates to form EVA/asphaltene composite particles. The composite particles are conducive to the formation of large dense spherical wax flocs, releasing more liquid oil phase, reducing the area of solid-liquid interface, weakening the interaction between wax crystals, helping to significantly improve the rheology of waxy oil performance. When the VA content increases to more than 40%, the rigidity of the EVA molecule is higher, which is conducive to its good oil dispersion ability interaction with wax molecules. At the same time, the highly polar EVA disperses the wax crystals into smaller sizes. Both of these aspects expand the solid-liquid interface area, enhance the interaction between wax crystals, make it easier for wax crystals to form a continuous wax crystal network structure, resulting in a decrease in the performance of EVA asphaltene. A moderate increase in the polarity of PPD helps to improve the efficiency between PPD asphaltenes. This conclusion provides strong evidence for the correctness of the mechanism of EVA/asphaltene composite particles.