Composite insulation including an inorganic aerogel and a melamine foam
The invention relates to insulating composite materials comprising an inorganic aerogel and a melamine foam. The invention also relates to the product method of said materials, and to the use of same.
1. A hydrophobic composite material comprising an inorganic aerogel reinforced by a preformed open-cell melamine foam, wherein
the material has a thermal conductivity λ between 10 and 20 mW/m-K at 20° C. and atmospheric pressure, and
the inorganic aerogel has a continuous three-dimensional porous structure.
2. The composite material according to claim 1 , wherein the inorganic aerogel is monolithic.
3. The composite material according to claim 1 , wherein the aerogel is formed from an inorganic sol comprising between 5% and 15% by weight of inorganic material based on the total weight of the inorganic sol.
4. The composite material according to claim 1 , wherein macropores whose diameter is between 50 and 250 microns comprises more than 80% of total number of macropores of said material.
5. The composite material according to claim 1 , wherein the material has a thickness of between 2 and 50 mm.
6. The composite material according to claim 1 , wherein the material has a density between 70 kg/m 3 and 150 kg/m 3 .
7. The composite material according to claim 1 , wherein the melamine foam is a melamine-formaldehyde foam having a thickness of between 2 and 50 mm, a porosity of between 95% and 99.5%, a density between 8.5 and 11.5 kg/m 3 , and a thermal conductivity of between 35 and 40 mW/m-K measured using a guarded hot plate according to NF EN 12667 at 20° C. and atmospheric pressure.
8. The composite material according to claim 1 , wherein the inorganic aerogel comprises silica, titanium oxide, manganese oxide, calcium oxide, carbonate calcium, zirconium oxide, or mixtures thereof.
9. The composite material according to claim 1 , wherein the material does not contain any binder.
10. The composite material according to claim 1 , wherein the material does not comprise a fibrous reinforcing material.
11. The composite material according to claim 1 , wherein the material has a quantity of residual solvent by weight of the composite material of less than or equal to 3% according to EN/ISO 3251.
12. The composite material according to claim 1 , wherein the aerogel further comprises an opacifier.
13. The composite material according to claim 1 , wherein the percentage of a volume occupied by macropores, macropores being pores with a diameter greater than 10 μm, in a volume occupied by the material in its entirety is less than 5%, as measured using X-ray tomography and in three dimensions.
14. The composite according to according to claim 1 , wherein the composite has a thermal conductivity λ between 10 and 15 mW/m-K, measured using a guarded hot plate according to NF EN 12667 at 20° C. and atmospheric pressure.
15. A multilayer panel comprising at least one layer consisting essentially of a composite material according to claim 1 .
16. A thermal insulation material comprising a composite material according to claim 1 .
17. An acoustic insulation material comprising a composite material according to claim 1 .