Flame-retardant gas filter material having high dust storage capacity
The invention relates to a filter material impregnated on one side with a binding agent that is in particular suited for gas filtration, wherein the filter material comprises a side that is not impregnated with a binding agent, which side contains a halogen-free and boron-free flame protection means. By means of the filter material according to the invention, a high separation rate and a high dust storage capacity are achieved, whereas the filter material is flame-retardant, and in the event of fire, does not release any toxic decomposition products. The invention further relates to a filter element comprising the filter material according to the invention.
1. A filter material comprising at least one material selected from the group consisting of wet-laid nonwovens, dry-laid nonwovens and foams, wherein one side is impregnated with a binding agent throughout the entire surface area of the one side of the filter material, and an opposite side of the filter material is without a binding agent, wherein the opposite side contains a halogen-free and boron-free flame protection means, and wherein the filter material has a separation efficiency of at least 90% and a dust storage capacity of at least 1.0 g/200 cm 3 .
2. The filter material according to claim 1 , wherein the halogen-free and boron-free flame protection means is bound to the fibers contained in the filter material.
3. The filter material according to claim 1 wherein the halogen-free and boron-free flame protection means is poorly soluble in water.
4. The filter material according to claim 2 , wherein the halogen-free and boron-free flame protection means comprises at least one nitrogenous component and optionally one phosphorous component, the nitrogenous component being bound to the fibers.
5. The filter material according to claim 1 , wherein the binding agent contains at least one member from the group consisting of phenolic resin and epoxy resin, melamine resin, urea-formaldehyde resin and thermoplastic polymer.
6. The filter material according to claim 1 , wherein the one side impregnated with a binding agent contains a halogen-free and boron-free flame protection means.
7. The filter material according to claim 1 , wherein the filter material has a grammage of 60 g/m 2 to 250 g/m 2 .
8. The filter material according to claim 1 , wherein the filter material has a thickness of 0.2 mm to 2.2 mm.
9. The filter material according to claim 1 , wherein the filter material has an air permeability of 50 l/m 2 s to 3000 l/m 2 s.
10. The filter material according to claim 1 , wherein the filter material has a flame-retardant effect according to DIN 53438 of at least K1 and at least F1.
11. The filter material according to claim 1 , wherein the filter material has a washout resistance of at least K1 and at least F1.
12. The filter material according to claim 1 , wherein the filter material has a prefilter ply on the inflow side.
13. The filter material according to claim 12 , wherein the prefilter ply comprises a meltblown nonwoven, a spunbonded nonwoven, a dry-laid staple fiber nonwoven, a wet-laid nonwoven, a glass fiber nonwoven, a fabric or a foam.
14. A filter element comprising a filter material according to claim 1 .
15. The filter material according to claim 1 , wherein said filter material is for gas filtration.
16. The filter material of claim 1 , wherein the filter material is a monolayer.
17. The filter material of claim 1 , wherein other materials are provided in front of and/or behind the filter material.
18. The filter material of claim 16 , wherein other materials are provided in front of and/or behind the filter material.
19. A filter material comprising at least one material selected from the group consisting of wet-laid nonwovens, dry-laid nonwovens and foams, wherein one side is impregnated with a binding agent throughout the entire surface area of the one side of the filter material, and an opposite side of the filter material is without a binding agent, wherein the opposite side contains a halogen-free and boron-free flame protection means, wherein the filter material is a monolayer, and wherein the filter material has a separation efficiency of at least 90% and a dust storage capacity of at least 1.0 g/200 cm 3 .
20. A filter element comprising the filter material of claim 19 .