| 摘要 |
1374777 Coated mineral material PIERREFITTE-AUBY 13 Oct 1971 [19 Oct 1970] 47679/71 Heading B2E [Also in Division C3] A method of preparing a road surfacing material by coating a mineral material with a hydrocarbon binder is characterised by mixing the binder which is at a temperature of at least 110‹C and which temperature is sufficient to fluidise the binder an additive selected from the following hydrochlorides:- (a) hydrochlorides of N-alkyl-polyalkylene polyamines of the formula R-[-NH-CH 2 ) n -)- p -NH.(p+1)HCl and (b) hydrochlorides of alkyl imidazolines of the formula: in which formulae R is an aliphatic hydrocarbon radical (C 8-22 ) R' is H, aminoethyl, hydroxyethyl or a polyaminopolyethylene radical having the formula -(CH 2 CH 2 NH) q H in which q is 1-4, n is a positive integer lower than or equal to 6, and p is an integer from 2 to 6. The amount of additive may be 0.1-1% by weight of the binder. A specific mineral material is quartzite gravel (8-12 mm.) which is mixed with a cut-back previously heated to 110‹C. The mineral material may be heated prior to mixing it with the binder, and the additive may be introduced in admixture with fillers. |
