Corrugated heat protection tube and methods of making the same
Described herein are corrugated heat protection tubes and methods of making the same. The heat protection tubes have improved heat resistance, improved abrasion resistance, and minimize or eliminate worker exposure to glass fiber insulating materials. The corrugated heat protection tubes can be used in automotive, transportation, and industrial applications, just to name a few.
1. A heat protection tube comprising:
an outer layer comprising aluminum and having an outer surface and an inner surface; and
an inner composite layer comprising an aluminum layer and a glass fiber layer, wherein the aluminum layer and the glass fiber layer are laminated together;
wherein the aluminum layer of the inner composite layer is bonded to the inner surface of the outer layer; and
wherein the glass fiber layer of the inner composite layer defines an interior space of the heat protection tube and wherein the glass fiber layer is at least partially coated with a polymer coating, wherein the polymer coating forms an innermost layer of the heat protection tube.
2. The heat protection tube of claim 1 , wherein the polymer coating comprises one or more of a polyacrylate, a polysiloxane, a polyurethane, a polyimide, a polybenzimidazole, a polybenzothiazole, a polybenzoxazole, a polyether, a polyimidazopyrrolone, a polyoxadiazole, a poly(p-phenylene), a polyquinoxaline, a polysulfide, a polysulfone, a polytriazole, a poly(p-xylylene), a polyamide, a poly(phenylene sulfide), and a polycarbonate.
3. The heat protection tube of claim 1 , wherein the polymer coating comprises a polyacrylate, a polyurethane, or a polysiloxane.
4. The heat protection tube of claim 1 , wherein the polymer coating is cross-linked.
5. The heat protection tube of claim 1 , wherein the polymer coating is heat stable up to about 250° C. for at least 3,000 hours.
6. The heat protection tube of claim 1 , wherein the polymer coating is heat stable up to 300° C. for at least 6 hours.
7. The heat protection tube of claim 1 , wherein the heat protection tube provides an internal temperature in the interior space of no greater than 65° C. for at least one hour when measured according to a heat protection test.
8. The heat protection tube of claim 1 , wherein the heat protection tube has a burning speed of zero as measured according to DIN 75200 test method (1989-09).
9. The heat protection tube of claim 1 , wherein the heat protection tube is operable to undergo 5,000,000 test cycles without developing visible hairline cracks or separation of laminated layers.
10. The heat protection tube of claim 1 , wherein the heat protection tube comprises corrugations.