ALUMINIUM-COPPER COMPOSITE SEMI-FINISHED PRODUCT FOR ELECTRICAL ENGINEERING AND METHOD FOR PRODUCING SAME

Abstract

A semi-finished product for electrical engineering is described, which is a composite of an aluminium sheet and a copper sheet. According to this disclosure, the semi-finished product bears an acrylate-based protective layer, which has been applied as a lacquer, which contains at least one photoinitiator and has been cured under the effect of light to form acrylate polymer, preferably acrylate copolymer. This disclosure also relates to an unfinished product produced from such a semi-finished product. A method for producing such a semi-finished product is also described.

Claims

1. A semi-finished product for electrical engineering, comprising: a composite of an aluminium sheet and a copper sheet; an acrylate-based protective layer applied to the composite as a lacquer containing at least one photoinitiator, the lacquer being cured under light to form an acrylate polymer; and the protective layer containing at least 5 wt % ethyl acrylate.

2. The semi-finished product according to claim 1, wherein the acrylate polymer is an acrylate copolymer.

3. The semi-finished product according to claim 1, wherein the protective layer contains 10 wt % to 25 wt % ethyl acrylate.

4. The semi-finished product according to claim 1, wherein the protective layer contains at least 5 wt % urethane acrylate.

5. The semi-finished product according to claim 2, wherein the protective layer contains no more than 15 wt % urethane acrylate.

6. The semi-finished product according to claim 1, wherein the protective layer contains at least 10 wt % epoxy acrylate.

7. The semi-finished product according to claim 1, wherein the protective layer contains at least 20 wt % epoxy acrylate.

8. The semi-finished product according to claim 1, wherein the lacquer contains two or more different photoinitiators.

9. The semi-finished product according to claim 1, wherein the cured lacquer contains reactive monomers configured to improve adhesion between the lacquer and a plastic when the semi-finished product is encapsulated with plastic.

10. An unfinished product produced from a semi-finished product according to claim 1.

11. A method for producing a semi-finished product for electrical engineering comprising the following steps: producing a composite from an aluminium sheet and a copper sheet; applying an acrylate-based lacquer to the composite, the acrylate-based lacquer containing acrylate monomers and at least one photoinitiator; polymerizing the acrylate monomers with radiation.

12. The method according to claim 11, wherein at least some of the acrylate monomers are aromatic or aliphatic epoxy acrylate monomers.

13. The method according to claim 11, wherein at least some of the acrylate monomers are polyester acrylate monomers.

14. The method according to claim 11, wherein the lacquer contains a reactive diluent.

15. The method according to claim 11, wherein at least some of the acrylate monomers contain at least two ethylenic double bonds per molecule.

16. The method according to claim 11, wherein the lacquer contains an adhesion promoter as an additive.

17. The method according to claim 16, wherein the lacquer contains an acrylate-based adhesion promoter as an additive.

18. The method according to claim 16, wherein the lacquer contains a methacrylate-based adhesion promoter as an additive.

19. The method according to claim 11, wherein the lacquer contains a substrate wetter based on polysiloxane as an additive.

20. The method according to claim 11, wherein the composite is produced from an aluminium sheet and a copper sheet by placing the aluminium sheet and the copper sheet one above the other in an edge region and then joining by rolling.

Description

[0031] FIG. 1 schematically shows a sectional view of an illustrative embodiment of a semi-finished product according to this disclosure, which consists of an aluminium sheet 1 and a copper sheet 2. The semi-finished product bears an acrylate-based protective layer 3 on the sides on which the aluminium sheet 1 is adjacent to the copper sheet 2.

[0032] While exemplary embodiments have been disclosed hereinabove, the present invention is not limited to the disclosed embodiments. Instead, this application is intended to cover any variations, uses, or adaptations of this disclosure using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.