Method of preparation of bitumen / polymer compositions crosslinked and / or functionalised a very low thermal susceptibility and application of the compositions obtained in the embodiment of coatings

摘要

Produced bitumen/polymer compositions are new and are produced using new process. Process of preparation of compositions of bitumen and crosslinked and/or functionalized polymer with very low thermal susceptibility comprises forming, at 100-230 deg C, with stirring, a homogeneous mass representing bitumen/polymer composition and composed of bituminous matrix containing uniformly dispersed crosslinked and/or functionalized elastomer formed from precursor elastomer used in amount 0.5-30 (preferably 1.5-20) wt.% per wt. of matrix, with the latter consisting of x wt.% of non-oxidized bitumen having penetration 20-900 (preferably 160-330), and y wt.% of oxidized bitumen, with penetration 10-90 (preferably 20-60) (with penetration determined according to standard NF T 66004 and expressed in 1/10 mm), where x is equal 20 to 95 (preferably 30-85) and y is equal from 5 to 80 (preferably 15-65), and x+y = 100. The process of production of crosslinked and/or functionalized bitumen/polymer compositions comprises bringing into contact, at 100-230 (preferably 130-200) deg C, with stirring, over a period of at least 5 minutes (preferably 30 minutes to 6 hours), non-oxidized bitumen and oxidized bitumen as described, with precursor elastomer, at ratio as above, and with 0.01-6 (preferably 0.05-3) wt.% of crosslinking and/or functionalizing agent. An Independent claim is also included for the application of compositions obtained as claimed as bituminous binders used directly or in aqueous emulsions for road surfacing, production of cold or hot applied coatings, and in waterproofing of coatings.