Method for preparing in aqueous emulsion a bitumen/polymer binder with a continuous three-dimensional polymeric structure and use of this binder for making coatings or mixtures for road surfacing

摘要

The following are delivered to an emulsion-forming region: (i) a bitumen/polymer component capable of being crosslinked with sulphur and which is in the form of a molten mass which has a temperature of between 100 DEG C and 230 DEG C and a viscosity of at most 2 Pa s at the said temperature, (ii) an aqueous phase containing an emulsifying system and having a temperature of between 10 DEG C and 90 DEG C and (iii) a crosslinking system yielding sulphur in an appropriate quantity, the weight ratio of the bitumen/polymer component to the aqueous phase ranging from 30:70 to 85:15, and the reaction mixture thus formed is kept in the emulsion-forming zone at a temperature of between 50 DEG C and 160 DEG C until a bitumen binder/polymer emulsion is obtained in which the polymer of the said binder is crosslinked into a three-dimensional structure. The emulsion obtained can be employed for the production of road surfaces, coated mixes or waterproof facings.