Rubber mixture and hose containing the rubber mixture
The disclosure relates to a rubber mixture which contains at least one fluorine rubber and at least one active filler and carbon nanotubes. The rubber mixture has an additionally improved tear propagation resistance and, at the same time, improved processability. The disclosure further relates to a hose having at least the following layer structure: an inner layer as a barrier layer against aggressive media, which contains at least one fluorine rubber and at least one active filler and carbon nanotubes; and, an outer layer made of a cross-linked rubber mixture.
1. A rubber mixture comprising:
at least one fluoro rubber;
at least one active filler; and,
carbon nanotubes.
2. The rubber mixture as claimed in claim 1 , comprising:
from 50 to 100 phr of a fluoro rubber or from 50 to 100 phr of a blend made of two or more fluoro rubbers.
3. The rubber mixture as claimed in claim 1 , comprising:
from 2 to 70 phr of the at least one active filler.
4. The rubber mixture as claimed in claim 1 , comprising:
from 0.1 to 10 phr of carbon nanotubes.
5. The rubber mixture as claimed in claim 1 , further comprising from 0 to 20 phr of inert fillers.
6. The rubber mixture as claimed in claim 1 , further comprising at least one resin.
7. The rubber mixture as claimed in claim 1 , wherein the fluoro rubber is one or more of poly(vinylidene fluoride-co-hexafluoropropylene) (VDF/HFP), poly(vinylidene fluoride-co-hexafluoropropylene-co-tetrafluoroethylene) (TFB), poly(vinylidene fluoride-co-tetrafluoroethylene-co-perfluorinated methyl vinyl ether) (VDF/TFE/PMVE), poly(tetrafluoroethylene-co-propylene) (TFE/P), and poly(vinylidene fluoride-co-chlorotrifluoroethylene) (VDF/CTFE).
8. The rubber mixture as claimed in claim 1 , wherein the fluoro rubber comprises a copolymer or terpolymer where the proportion of fluorine is from 50 to 70%.
9. The rubber mixture as claimed in claim 1 , wherein the rubber mixture comprises no inert fillers, or less than 5 phr of inert filler.
10. The rubber mixture as claimed in claim 1 , wherein the active filler is active carbon black.
11. The rubber mixture as claimed in claim 10 , wherein the iodine number of the active carbon black is from 60 to 300 g/kg in accordance with ASTM D1510, and the DBP number thereof is from 60 to 150 cm 3 /100 g in accordance with ASTM D2414.
12. A hose having a layer structure comprising:
an internal layer as barrier layer with respect to aggressive media, which comprises at least one fluoro rubber, at least one active filler, and carbon nanotubes, and
an external layer made of a crosslinked rubber mixture.
13. The hose as claimed in claim 12 having no reinforcement layer, wherein the hose consists of an internal layer and an external layer.
14. The hose as claimed in claim 12 , further comprising:
a reinforcement layer arranged between the internal layer and the external layer,
wherein the reinforcement layer is composed of one or more sublayers.
15. The hose as claimed in claim 12 , wherein the internal layer comprises from 50 to 100 phr of a fluoro rubber or from 50 to 100 phr of a blend made of two or more fluoro rubbers.
16. The hose as claimed in claim 12 , wherein the internal layer comprises from 2 to 70 phr of the at least one active filler.
17. The hose as claimed in claim 12 , wherein the active filler is an active carbon black.
18. The hose as claimed in claim 12 , wherein the internal layer comprises from 0.1 to 10 phr of carbon nanotubes.