INSULATING BITUMEN-POLYMER MASTIC AND A METHOD FOR PREPARATION THEREOF Russian patent published in 2004 - IPC

FIELD: cementation substances.

SUBSTANCE: mastic intended for anticorrosive protective coatings of underground pipelines contains, wt %: bitumen mix (BND-50.90 - 85-90 and BNI-4 - 1-20 or BN-70/30 - 1.90; divinylstyrene thermoelastoplastic 1.5-5; plasticizer 1-5; filler 1-8; petroleum-polymer resin 2-8; adhesive additive 0.3-1.5; and modifier 1-6. Preparation procedure comprises preparing first mix from road and insulation or construction bitumens, heating the mix to 160-179^оС in order to dehydrate it, loading it into mixer, adding plasticizer, stirring resulting blend for 2.5-3.5 h at 165-175^оС until plasticizer completely dissolves, after which filler, e.g. rubber crumb, is added and the total is agitated for 25-35 min before addition of petroleum-polymer resin, modifier, adhesive additive, and thermoelastoplastic.

EFFECT: increased reliability of coating.

1 tbl, 2 ex