Tube connectors based on a polyamide composition
A tube connector made from a polyamide composition, the polyamide composition including at least one first polyamide A having an average number of carbon atoms per nitrogen atom C A and at least one second polyamide B having an average number of carbon atoms per nitrogen atom C B , wherein C A ≤8.5 and C B ≥7.5, and wherein C A <C B . The composition may include a third polyamide C having an average number of carbon atoms per nitrogen atom C C , wherein C B ≤C C .
1. A method of connecting a tube connector part to a tube or a functional part, the method comprising welding a tube connector part to the tube or functional part, wherein the tube connector part is made from a composition, the composition comprising at least one first polyamide A having an average number of carbon atoms per nitrogen atom CA and at least one second polyamide B having an average number of carbon atoms per nitrogen atom CB, wherein CA=8 and CB≥9, and wherein CA<CB, wherein the difference CB−CA is from 1 to 6, and
wherein the tube connector is not a tube,
wherein the tube connector is incorporated into a fluidic circuit for conveying liquids, and
wherein polyamide A is PA 6.10.
2. The method of connecting a tube connector part of claim 1 , wherein the composition comprises from 1 to 70 wt. % of the at least one first polyamide A.
3. The method of connecting a tube connector part of claim 1 , wherein the second polyamide B is selected from PA 6.12, PA 6.14, PA 10.10, PA 11, PA 12, PA 10.12, PA 6.18, PA 12.T, PA 12/10.T, PA 10.10/10.T, PA B.12, PA B.10/10.10, PA IPD.10, PA B.I/12 and mixtures thereof.
4. The method of connecting a tube connector part of claim 1 , wherein the composition comprises from 1 to 70 wt. % of the at least second polyamide B.
5. The method of connecting a tube connector part of claim 1 , wherein the composition consists of one first polyamide A, one second polyamide B and, optionally, non-polyamide additives.
6. The method of connecting a tube connector part of claim 1 , wherein the composition comprises, in addition to the first polyamide A and the second polyamide B, at least one third polyamide C having an average number of carbon atoms per nitrogen atom CC, wherein CC≥9 and CC≥CB.
7. The method of connecting a tube connector part of claim 6 , wherein CC≥9 and CC>CB.
8. The method of connecting a tube connector part of claim 6 , wherein the difference CC−CB is from 1 to 4.
9. The method of connecting a tube connector part of claim 6 , wherein the second polyamide B is selected from PA 6.12 ; and the third polyamide C is selected from PA 6.14, PA 10.10, PA 11, PA 12, PA 10.12, PA 6.18, PA 12.T, PA 12/10.T, PA 10.10/10.T, PA B.12, PA B.10/10.10, PA IPD.10, PA B.I/12 and mixtures thereof.
10. The method of connecting a tube connector part of claim 6 , wherein the composition comprises from 1 to 80 wt. % of the at least one second polyamide B; and the composition comprises from 1 to 70 wt. % of the at least one third polyamide C.
11. The method of connecting a tube connector part of claim 6 , wherein the composition consists of one first polyamide A, one second polyamide B, one third polyamide C and, optionally, non-polyamide additives.
12. The method of connecting a tube connector part of claim 1 , wherein the amount of polyamides in the composition is from 30 to 100 wt. %.
13. The method of connecting a tube connector part of claim 1 , wherein the composition further comprises additives selected from impact modifiers, processing aids, fillers, stabilizers, nucleating agents, dyes, pigments, fireproofing agents, or mixtures thereof.
14. The method of connecting a tube connector part of claim 1 , wherein the fluidiccircuit conveys liquids in motor vehicles.
15. The method of connecting a tube connector part of claim 1 , wherein the tube connector part is formed by an injection molding process.
16. The method of connecting a tube connector part of claim 15 , wherein the tube connector part is welded to one or more tubes.
17. A method of connecting a tube connector part to at least one tube or a functional part, the method comprising welding a tube connector part to the tube or functional part, wherein the tube connector part is made from a composition, the composition comprising at least one first polyamide A having an average number of carbon atoms per nitrogen atom CA and at least one second polyamide B having an average number of carbon atoms per nitrogen atom CB, wherein CA=8 and CB≥9, and wherein CA<CB, wherein the difference CB−CA is from 1 to 6,
wherein the tube connector part is formed by an injection molding process,
wherein the tube connector part is not a tube,
wherein the tube connector is incorporated into a fluidic circuit for conveying liquids, and wherein polyamide A is PA 6.10.
18. The method of connecting a tube connector part of claim 16 , wherein the tube is a polyamide tube.
19. The method of connecting a tube connector part of claim 18 , wherein the polyamide tube is a multilayer tube containing different polyamide components in the inner and outer layers.
20. The method of connecting a tube connector part of claim 19 , wherein the multilayer tube has a PA 12-based outer layer and a PA 6-based inner layer.
21. The method of connecting a tube connector part of claim 1 , wherein the welding is spin welding.
22. The method of connecting a tube connector part of claim 14 , wherein the circuit is in a motor vehicle.
23. The method of connecting a tube connector part of claim 22 , wherein the fluid is a refrigerant.
24. The method of connecting a tube connector part of claim 22 , wherein the fluid is a fuel.
25. The method of connecting a tube connector part of claim 1 , wherein the tube connector part is welded to the functional part.
26. The method of connecting a tube connector part of claim 25 , wherein the functional part is a filter.
27. The method of connecting a tube connector part of claim 1 , wherein the second polyamide B is selected from PA 10.10, PA 11, PA 12, PA 10.12, PA 12.T, PA 12/10.T, PA 10.10/10.T, PA B.12, PA B.10/10.10, PA IPD.10, PA B.I/12 and mixtures thereof.
28. The method of connecting a tube connector part of claim 1 , wherein the composition further comprises carbon fibers in an amount that contributes 5% to the total weight of said composition.
29. The method of connecting a tube connector part of claim 1 , wherein the composition comprises, in addition to the first polyamide A and the second polyamide B, at least one third polyamide C having an average number of carbon atoms per nitrogen atom CC, wherein CC≥9 and CC≥CB, and wherein the composition comprises, either:
from 1 to 80 wt. % of the at least one second polyamide B; or
from 1 to 70 wt. % of the at least one third polyamide C.
30. A weldable tube connector part made from a composition, the composition comprising at least one first polyamide A having an average number of carbon atoms per nitrogen atom CA and at least one second polyamide B having an average number of carbon atoms per nitrogen atom CB, wherein CA=8 and CB>8, and wherein CA<CB, wherein the composition further comprises, in addition to the first polyamide A and the second polyamide B, at least one third polyamide C having an average number of carbon atoms per nitrogen atom CC, wherein CC>8 and CC≥CB, and wherein the composition comprises, either:
from 1 to 80 wt. % of the at least one second polyamide B; or
from 1 to 70 wt. % of the at least one third polyamide C,
wherein the tube connector part is nota tube,
wherein the tube connector is incorporated into a fluidiccircuit for conveying liquids, and wherein polyamide A is PA 6.10.
31. The method of connecting a tube connector part of claim 1 , wherein the tube connector part is made of a single layer of the composition.