CHEMICAL MODIFICATION OF ROAD PETROLEUM BITUMEN WITH MALEIC ANHYDRIDE AND POLYETHYLENE GLYCOLS

Abstract

A number of problems arise in the production and application of road bitumen. One of them is unsatisfactory operational characteristics, mainly heat resistance, elasticity and adhesion between the binder and aggregate. With an increase in the intensity of traffic, an increase in the volume of heavy goods transportation, the mass of cars, together with the influence of weather and climate factors on the structure, this leads to the destruction of the road surface. The work describes the results of the study of the process of chemical modification of road petroleum bitumen with maleic anhydride and polyethylene glycols (PEG) to obtain bitumen-polymer mixtures, which, in addition to good heat resistance, also have high elasticity. When modifying road bitumen with maleic anhydride, the latter acts as a certain narrowing link, which contains on the one hand a double bond that interacts with bitumen, and on the other hand an anhydride group that can interact with various polymers containing functional groups (hydroxyl, epoxy and other). Further, by adding a polymer to maleinized bitumen (bitumen modified with maleic anhydride), the resulting bitumen-polymer mixtures can be given various properties (heat resistance, elasticity, adhesion, and others). Polyethylene glycol is a cheap polymer capable of interacting with the anhydride group of maleic anhydride in bitumen on the hydroxyl group. It was established that the effect of maleic anhydride and maleic anhydride together with PEG on the heat-resistant characteristics of bitumen is the same regardless of the modification conditions. Compared to the original bitumen, the obtained BPS is characterized by a higher softening temperature, lower penetration and ductility. The temperature of brittleness is not rapid, but it is increasing. The influence of the used modifiers on bitumen elasticity is significant and depends on the modification conditions. It was established that PEG 2000 is the optimal PEG for modifying maleinized bitumen, from the point of view of ensuring good bitumen elasticity.