FR2507192A1

FR2507192A1 - Bituminous binder contg. scrap rubber and oil - shows penetration similar to prod. from bitumen and elastomer

Info

Publication number: FR2507192A1
Application number: FR8111040A
Authority: FR
Inventors: Francois Svilarich
Original assignee: SACER SA
Current assignee: SACER SA
Priority date: 1981-06-04
Filing date: 1981-06-04
Publication date: 1982-12-10

Abstract

In the mfr. of a bituminous binder from bitumen, scrap rubber and a petroleum distillate are added. Pref., 5-13% (esp. about 10%) scrap rubber peel and 2.5-5% (esp. about 5%) of a heavy aromatic oil fraction are kneaded with the bitumen for several hrs. at about 160 deg.C. The scrap rubber is cheaper than the elastomers usually used, and the oil stops its particles agglomerating. The binder has penetration value equal to that of the best bituminous binders.

Description

I1 est bien connu qu'on peut améliorer les propriétés physiques des liants bitumineux par l'adjonction d'élastomères du fait de la plus grande élasticité qui leur est ainsi conférée, les liants bitumineux ainsi obtenus sont moins fragiles aux basses températures et moins fluants aux températures élevées. It is well known that the physical properties of bituminous binders can be improved by the addition of elastomers due to the greater elasticity which is thus conferred on them, the bituminous binders thus obtained are less fragile at low temperatures and less fluid at high temperatures.

Malheureusement le prix des élastomères est élevé et leur adjonction aux bitumes grève fortement le prix de ceux-ci. Unfortunately, the price of elastomers is high and their addition to bitumens greatly increases the price of these.

Pour pallier cet inconvénient on a cherché a remplacer les elastomères par des déchets de caoutchouc, mais les essais pratiqués avec les bitumes communément utilisés en France se sont montrés décevant.; les déchets de caoutchouc, bien qu'utilisés en grains de moins de 500 r, s'agglomèrent mal au bitume, malgré un malaxage à chaud, 1600 environ pendant plusieurs heures, trois heures par exemple. To overcome this drawback, attempts have been made to replace the elastomers with rubber waste, but the tests carried out with the bitumens commonly used in France have been disappointing .; rubber waste, although used in grains of less than 500 r, does not agglomerate well with bitumen, despite hot mixing, around 1600 for several hours, for example three hours.

Or on a trouvé suivant la présente invention qu'on pouvait obtenir un liant bitumineux comportant une adjonction de déchets de caoutchouc, par exemple de pelures de caoutchouc, telles que celles provenant du réchappage de pneus, qui soit d'aussi bonne qualité que les liants bitumineux comportant une adjonction d'élastomères, en ajoutant au mélange une quantité appropriée d'huile de distillation du pétrole, qui est un produit peu coûteux : on peut par exemple utiliser cet effet un certain nombre de fractions aromatiques lourdes, et notamment celles que commercialise
Schell-Chimie sous la marque DUTREX.However, it has been found according to the present invention that it is possible to obtain a bituminous binder comprising an addition of waste rubber, for example rubber peelings, such as those from the tires, which is as good as the binders. bituminous comprising an addition of elastomers, by adding to the mixture an appropriate quantity of petroleum distillation oil, which is an inexpensive product: one can for example use this effect a certain number of heavy aromatic fractions, and in particular those which are marketed
Schell-Chimie under the DUTREX brand.

Les propositions de ces produits peuvent par exemple être de l'ordre de 5 13 % de pelures de caoutchouc et de 2,5 a 5 d'huile
c'est ainsi que d'excellents résultats ont été obtenus en malaxant à chaud pendant plusieurs heures, un mélange de bitume avec 10 % de pelures de caoutchouc et 5 % d'huile.The proposals for these products can for example be of the order of 5 to 13% of rubber peels and of 2.5 to 5 of oil
this is how excellent results have been obtained by mixing hot for several hours, a mixture of bitumen with 10% of rubber peels and 5% of oil.

Les essais classiques de "pénétration" montrent que le liant obtenu est grandement amélioré par rapport au liant à base de bitume sans adjonction, et aussi bon que les meilleurs liants à base de bitume avec adjonction d'élastomères. Conventional "penetration" tests show that the binder obtained is greatly improved compared to the bitumen-based binder without addition, and as good as the best bitumen-based binders with the addition of elastomers.

Claims

1. A method of manufacturing a bituminous binder comprising the addition of rubber waste, characterized in that an appropriate quantity of petroleum distillation oil is added to the mixture.

2. Method according to claim 1 characterized in that the mixture contains from 5 to 13% of rubber peels and from 2.5 to 5% of oil.

3. Method according to claim 2 characterized in that kneaded hot, for several hours, a mixture of bitumen with about 10% of rubber peels and about 5% of petroleum distillation oil.

4. Method according to claim 3 characterized in that this mixing takes place at a temperature of about 1600.

5. Process according to any one of Claims 1 to 4, characterized in that heavy aromatic fractions, such as those which Schell-Chimie markets under the brand DUTREX, are used as petroleum distillation oil.