Sorbent-coated aluminium strip
The invention relates to a method for producing an aluminum strip, in which the aluminum strip is coated with a sorption layer which has a binder and a sorbent. The object to propose a method for producing an aluminum strip coated with a sorption layer, by means of which an aluminum strip can be coated cost-effectively having constant performance characteristics with respect to the sorption of, for example, water vapor, is achieved according to the invention by means of a method for producing an aluminum strip coated with a sorption layer by applying a suspension to the aluminum strip in the coil-coating process, which in addition to a liquid comprises at least one binder, formed as a solid, and a sorbent, and by subjecting the aluminum strip, together with the applied suspension, to a drying process, in which the binder is activated.
1. Method for producing an aluminium strip, comprising:
coating the aluminium strip with a sorption layer which comprises a suspension;
applying the suspension to the aluminium strip in the coating process, the suspension comprising a liquid, at least one binder, formed by suspension polymerisation or by suspension copolymerisation, and a sorbent, wherein the sorbent in the suspension is not wetted through the solid binder, and
subjecting the aluminium strip together with the applied suspension to a drying process, in which the liquid in the suspension is evaporated and the binder is activated, wherein zeolites or silica gels are used as sorbents.
2. Method according to claim 1 , wherein the drying process takes place at temperatures of 60° C. to 380° C.
3. Method according to claim 1 , wherein the binder comprises a mixture of acrylate copolymer and styrene copolymer, a mixture of polyvinyl acetate polymers and copolymers, polyvinyl acetals, polyvinyl alcohols, polyvinyl ethers, polyurethane and/or polymethacrylate homopolymers and copolymers.
4. Method according to claim 1 , wherein the suspension comprises polyvinyl alcohols, polyacrylates and/or polyvinyl butyrals as additives.
5. Method according to claim 1 , wherein silver nanoparticles are integrated into the coating system.
6. Method according to claim 1 , wherein the surface of the aluminium strip is pre-treated before the coating process.
7. Method according to claim 6 , wherein the aluminium strip is chromated during the step of pre-treatment before the coating process.
8. Aluminium strip coated with a one-sided or double-sided sorption layer using a method according to claim 1 , wherein the aluminium strip has a thickness of 0.06 mm to 0.2 mm.
9. Aluminium strip coated with a one-sided or double-sided sorption layer using a method according to claim 1 , wherein the aluminium strip has a thickness of 0.03 mm to 0.6 mm.
10. Aluminium strip according to claim 9 , wherein the thickness of the sorption layer is 2 to 30 g/m 2 .
11. Aluminium strip according to claim 9 , wherein the aluminium strip consists of an EN AW 8006 or EN AW 8011 type aluminium alloy.
12. Aluminium strip according to claim 9 , wherein the thickness of the sorption layer is 5 to 8 g/m 2 .
13. An apparatus comprising one element selected from the group consisting of a heat exchanger, a circulating heat exchanger, a sorption rotor and an active dehumidifying device, the element comprising an aluminium strip according to claim 9 .