Heat protection product

Abstract

A heat protection product comprising a felt layer, which comprises polysulfone polyamide fibers, and a textile layer, which comprises inorganic fibers, said textile layer comprising a metal layer.

Claims

1. A heat protection product comprising a felt layer comprising polysulfonamide fibers having a felt layer first side and a felt layer second side; and a textile layer comprising inorganic fibers having a first side connected to the felt layer second side, and an opposite second side, wherein said textile layer is bonded to a metal layer on at least the second side that is not in contact with the felt layer, the felt layer first side is an outer layer of the heat protection product, and wherein the felt layer first side defines a cold side (Tu) and an opposite outer side of the product defines a hot side (To), the product exhibits 25% or less of the loss of insulating properties of a comparative product with layers of felt and textile respectively having the same or greater thickness as the respective felt layer and textile layer of the heat protection product but with the polysulfonamide fibers replaced with non-polysulfonamide fibers when exposed to the same temperature between 200 C. and 300 C. on the hot side (To) for the same duration, and the reduction in insulation is measured by a change in the difference between a measured surface temperature at the hot side (To) and a measured surface temperature at the cold side (Tu).

2. The heat protection product of claim 1, wherein the heat protection product withstands heating to 300 C. for 1000 hours.

3. The heat protection product according to claim 1, wherein said felt layer comprises at least 50% by weight of polysulfonamide fibers.

4. The heat protection product according to claim 1, wherein said felt layer additionally comprises preoxidized polyacrylonitrile fibers.

5. The heat protection product according to claim 1, wherein said felt layer has a thickness of from 1 to 10 mm.

6. The heat protection product according to claim 1, comprising a polymer layer positioned between the felt layer and the textile layer.

7. The heat protection product according to claim 1, wherein said inorganic fibers of the textile layer are selected from the group consisting of glass, carbon, silicate, ceramics, aluminum silicate, basalt and mixtures thereof.

8. The heat protection product according to claim 1, wherein said textile layer is a woven or knitted fabric, structure or non-crimp fabric.

9. The heat protection product according to claim 1, wherein said felt layer and said textile layer are bonded together by felting, needling, knitting, fulling, adhesive bonding, or combinations thereof.

10. The heat protection product according to claim 1, wherein said metal layer is applied to said textile layer by vapor deposition.

11. The heat protection product according to claim 10, wherein said textile layer is coated with a binder before the metal layer is applied.

12. The heat protection product according to claim 11, wherein said binder is selected from the group consisting of EPDM, PFA, PMMA, POM, PEEK, PVA, epoxy resins, hybrid polymers and silicon compounds.

13. The heat protection product according to claim 1, wherein said metal layer is adhesively bonded to said textile layer.

14. The heat protection product according to claim 13, wherein said metal layer is selected from aluminum, chromium, titanium, copper, silver, gold, silicon or combinations thereof.

15. The heat protection product according to claim 1, wherein said felt layer has a density of from 0.05 to 0.25 g/cm.sup.3.

16. The heat protection according to claim 6, wherein the polymer layer is a polymer sheet or polymer coating.

17. The heat protection product of claim 12, wherein the silicon compound is a polysiloxane.

18. The heat protection product of claim 1, wherein the metal layer has a layer thickness of from 5 to 100 m.

19. A heat protection product comprising a felt layer comprising polysulfonamide fibers having a felt layer first side and a felt layer second side; and a textile layer comprising inorganic fibers having a first side connected to the felt layer second side, and an opposite second side, wherein said textile layer is bonded to a metal layer on at least the second side that is not in contact with the felt layer, the felt layer first side is an outer layer of the heat protection product, the felt layer first side defines a cold side (Tu) and an opposite outer side of the product defines a hot side (To), the product has an initial thickness, and after exposure on the hot side (To) to a temperature of 300 C. for 120 hours, the product experiences a loss of thickness of less than 4%.

20. The heat protection product according to claim 19, wherein the product retains insulating properties such that a reduction in insulation as measured by a change in the difference between a measured surface temperature at the hot side (To) and a measured surface temperature at the cold side (Tu) is less than 4% after exposure on the hot side (To) to temperature of 300 C. for 120 hours.

21. The heat protection product according to claim 19, wherein said felt layer additionally comprises preoxidized polyacrylonitrile fibers.

22. A heat protection product comprising a felt layer comprising polysulfonamide fibers having a felt layer first side and a felt layer second side; and a textile layer comprising inorganic fibers having a first side connected to the felt layer second side, and an opposite second side, wherein said textile layer is bonded to a metal layer on at least the second side that is not in contact with the felt layer, the felt layer first side is an outer layer of the heat protection product, the felt layer first side defines a cold side (Tu) and an opposite outer side of the product defines a hot side (To), and the product retains insulating properties such that a reduction in insulation as measured by a change in the difference between a measured surface temperature at the hot side (To) and a measured surface temperature at the cold side (Tu) is less than 4% after exposure on the hot side (To) to temperature of 300 C. for 120 hours.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a first embodiment of the disclosed heat protection product;

(2) FIG. 2 shows another embodiment of the disclosed heat protection product;

(3) FIG. 3 shows yet another embodiment of the disclosed heat protection product; and

(4) FIG. 4 shows another embodiment of the disclosed heat protection product.

DETAILED DESCRIPTION

(5) FIG. 1 shows an embodiment of the disclosed heat protection product in which a textile layer 2 is bonded on one side thereof with a felt layer 1, a metal layer 3 obtainable by vapor deposition being present on the other side.

(6) FIG. 2 shows an alternate embodiment, in which a felt layer 1 and a textile layer 2 are bonded together by felting, while the latter is bonded to a metal foil 3.

(7) FIG. 3 shows an embodiment with a felt layer 1 bonded to a textile layer 2, having both sides thereof provided with a metal layer 3 obtainable by vapor deposition. A polymer layer 4 is present between said felt layer and said metal layer 3.

(8) FIG. 4 shows an embodiment with a felt layer 1 bonded to a textile layer 2, having one side thereof provided with a metal layer 3 obtainable by vapor deposition. A polymer layer 4 is present between said felt layer 1 and said textile layer 2.

(9) The disclosed embodiments are further explained by the following nonlimiting Examples.

Examination Methods

Shrinkage in Thickness

(10) The materials were exposed to temperatures of 300 C. for defined periods of time, and the thickness of the material was measured according to DIN EN ISO 5084.

(11) Insulation Properties

(12) The metal side of the product was heated at a defined temperature, and the temperature difference on the felt side was measured. These measurements were repeated after the product had been stored at the set temperature for 120 h.

Comparative Example 1

(13) A heat protection product was prepared by bonding a 2.0 mm thick felt layer consisting of preoxidized polyacrylonitrile fibers to a 0.3 mm thick glass fabric layer, to which a 10 m thick aluminum foil was adhesively bonded.

Example 2

(14) A 2.0 mm thick felt layer containing 90% by weight of polysulfonamide fibers and 10% by weight of preoxidized polyacrylonitrile fibers was bonded to a 0.3 mm thick glass fabric layer, to which a 10 m thick aluminum foil was adhesively bonded.

Example 3

(15) A 1.6 mm thick felt layer containing 90% by weight of polysulfonamide and 10% by weight of preoxidized polyacrylonitrile was felted with a 0.8 mm thick glass fabric layer, followed by adhesive bonding to a 25 m thick aluminum foil.

Comparative Example 4

(16) To an about 0.3 mm thick glass fabric having one side thereof provided with an about 100 nm thick metal layer by vapor deposition was applied an about 0.1 mm thick silicone coating, to which an about 2.1 mm thick felt layer consisting of preoxidized polyacrylonitrile fibers was then adhesively bonded.

Example 5

(17) To an about 0.3 mm thick glass fabric having one side thereof provided with an about 100 nm thick metal layer by vapor deposition was applied an about 0.1 mm thick silicone coating, to which an about 1.8 mm thick felt layer consisting of 90% polysulfonamide fibers and 10% preoxidized polyacrylonitrile fibers was then adhesively bonded.

(18) Results

(19) Tables 1 and 2 show measured values of the Examples.

(20) As could be expected, it is found that the insulation properties increase as the aluminum or felt layer becomes thicker, depending on the material structure. However, it is also found that felts without polysulfonamide fibers cannot cope with the temperature loads over an extended period of time, but both lose in thickness and significantly reduce their insulating properties.

(21) All quoted documents are included in this disclosure by reference to the full extent thereof, unless such disclosure would be in contradiction to the teaching of the invention.

(22) TABLE-US-00001 TABLE 1 Comparative Example 1 Example 2 Example 3 300 C. Material thickness Loss of thickness Loss of thickness Loss of thickness (total) (total) (total) after 0 h 2.35 2.36 2.40 after 45 h 2.18 7% 2.36 0% 2.40 0% after 120 h 2.09 11% 2.29 3% 2.33 3% 200 C. Insulating properties To Tu Insulation reduction To Tu Insulation reduction To Tu Insulation reduction (Kelvin) (Kelvin) (Kelvin) after 0 h 75 75 0% 87 after 120 h 55 27% 73 3% 86 1% 250 C. Insulating properties To Tu Insulation reduction To Tu Insulation reduction To Tu Insulation reduction (Kelvin) (Kelvin) (Kelvin) after 0 h 86 87 108 after 120 h 69 20% 87 0% 107 1% 300 C. Insulating properties To Tu Insulation reduction To Tu Insulation reduction To Tu Insulation reduction (Kelvin) (Kelvin) (Kelvin) after 0 h 100 100 127 after 120 h 83 17% 100 0% 127 0%

(23) TABLE-US-00002 TABLE 2 Comparative Example 4 Example 5 Loss of Loss of Material thickness thickness thickness (total) (total) 300 C. after 0 h 2.57 2.16 after 45 h 2.43 6% 2.14 1% after 120 h 2.24 13% 2.17 0% Insulating To-Tu Insulation To-Tu Insulation properties (Kelvin) reduction (Kelvin) reduction 200 C. after 0 h 76 76 after 120 h 73 4% 75 1% 250 C. after 0 h 95 93 after 120 h 81 15% 92 1% 300 C. after 0 h 111 112 after 120 h 97 13% 109 3% To = surface temperature on metal side (hot side) Tu = surface temperature on felt side (cold side) To-Tu = difference of surface temperatures