Wearable rubber parts for fluid handling services including a polyurethane inner layer
View Patent ↗Wearable rubber parts for fluid handling systems include a four layer structure, wherein the inner most layer of the four layer structure is a polyurethane layer. The polyurethane can be millable polyurethane. The polyurethane used in the inner most layer can be produced by reacting diisolcyanate with a polyester and/or polyether polyols and a chain extender. The wearable rubber part can be an expansion joint, a pinch valve, or a hose.
1. A flexible expansion joint comprising:
an inner most layer comprising polyurethane;
a reinforcement layer; and
an outer layer;
wherein the flexible expansion joint is a flowing arch expansion joint.
2. The flexible expansion joint of claim 1 , wherein the polyurethane is millable polyurethane.
3. The flexible expansion joint of claim 1 , wherein the inner most layer consists of polyurethane.
4. The flexible expansion joint of claim 1 , wherein the inner most layer comprises greater than 70 wt % polyurethane.
5. The flexible expansion joint of claim 1 , wherein the polyurethane of the inner most layer is produced by reacting diisocyanate with a polyol and a chain extender, and wherein the polyol is only or predominantly polyether polyols.
6. The flexible expansion joint of claim 1 , wherein the polyurethane of the inner most layer is produced by reacting diisocyanate with a polyol and a chain extender, and wherein the polyol includes polyester polyols.
7. The flexible expansion joint of claim 2 , wherein the reinforcement layer comprises fabric reinforcement material.
8. The flexible expansion joint of claim 2 , wherein the outer layer comprises an elastomeric compound.
9. A flexible expansion joint comprising:
an inner most layer comprising polyurethane;
a reinforcement layer; and
an outer layer;
wherein the flexible expansion joint is an abrupt arch expansion joint.
10. The flexible expansion joint of claim 9 , wherein the polyurethane is millable polyurethane.
11. The flexible expansion joint of claim 9 , wherein the inner most layer consists of polyurethane.
12. The flexible expansion joint of claim 9 , wherein the inner most layer comprises greater than 70 wt % polyurethane.
13. The flexible expansion joint of claim 9 , wherein the polyurethane of the inner most layer is produced by reacting diisocyanate with a polyol and a chain extender, and wherein the polyol is only or predominantly polyether polyols.
14. The flexible expansion joint of claim 9 , wherein the polyurethane of the inner most layer is produced by reacting diisocyanate with a polyol and a chain extender, and wherein the polyol includes polyester polyols.
15. The flexible expansion joint of claim 10 , wherein the reinforcement layer comprises fabric reinforcement material.
16. The flexible expansion joint of claim 10 , wherein the outer layer comprises an elastomeric compound.