Adhesive tape, particularly for bonding photovoltaic modules
View Patent ↗The present invention relates to the use of an adhesive tape for adhesively bonding photovoltaic modules, more particularly for adhesively bonding a PV laminate in the frame of a PV module, where the adhesive tape has at least one adhesive layer and where there is at least one polymer layer comprising a foaming agent.
1. A method for sealing the edges of a photovoltaic laminate and bonding said laminate in a frame, which comprises providing a frame having grooves, pressing an adhesive tape having at least one adhesive layer, at least one foamable polymer layer comprising a foaming agent, and a barrier layer, into said grooves to form adhesive grooves and inserting the edges of said laminate into said adhesive grooves, or applying said adhesive tape over the edges of said laminate and inserting the adhesive tape covered edges of said laminate into said grooves, and foaming said polymer layer to seal the edges of said laminate and bond said laminate in said grooves.
2. Method according to claim 1 , wherein the foamable polymer layer comprising the foaming agent is a foamable adhesive polymer layer.
3. Method according to claim 1 wherein at least one adhesive layer is formed of poly(diorgano)siloxanes.
4. Method according to claim 1 wherein at least one adhesive layer comprises a moisture-crosslinking, silylated, pressure-sensitive polyurethane adhesive.
5. Method according to claim 1 , wherein at least two adhesive layers are present, and the adhesive layers form a top and a bottom adhesive layer.
6. Method according to claim 1 , wherein the foamable polymer layer comprising the foaming agent has, after foaming, a layer thickness in the range from about 100 μm to about 3000 μm.
7. Method according to claim 1 , wherein the foamable polymer layer comprising the foaming agent is foamed by application of heat.
8. Method of claim 7 wherein the foamable polymer layer is heated to at least 100° C.
9. Method of claim 8 wherein the foamable polymer layer is heated to at least 150° C.
10. Method according to claim 1 wherein the foamable polymer layer comprising the foaming agent undergoes, as a result of the foaming, a volume increase of at least 30%.
11. Method according to claim 1 wherein the frame is produced by extrusion and the adhesive tape is introduced into the frame during the extrusion of the frame.
12. Method according to claim 11 , wherein the adhesive tape together with the frame is separated to the desired length.
13. Method of claim 1 , wherein the adhesive tape comprises a carrier formed of a barrier layer.