IMPREGNABLE ELECTRICAL INSULATING PAPER AND METHOD FOR PRODUCING ELECTRICAL INSULATING PAPER

Abstract

An impregnable electrical insulating paper for an electrical insulating body having first platelet-shaped particles which have layer silicates, and second platelet-shaped particles which have a heat conductivity at 20 C. of at least 1 W/mK. A method for producing an impregnable electrical insulating paper, an electrical insulating tape, an electrical insulating body, and the use of the electrical insulating body having first platelet-shaped particles which have layer silicates, and second platelet-shaped particles.

Claims

1. An impregnable electrical insulating paper for an electrical insulating body, comprising: first flaky particles, which comprise layered silicates, and second flaky particles, which have a thermal conductivity at 20 C. of at least 1 W/mK.

2. The electrical insulating paper as claimed in claim 1, wherein the second particles are provided in a sufficiently high volume proportion in relation to the electrical insulating paper that the second particles are in touch contact with one another and a network is thus formed from the second particles, which connects the two opposing sides of the electrical insulating paper to one another.

3. The electrical insulating paper as claimed in claim 1, wherein the second particles are provided in a volume proportion in relation to the electrical insulating paper of 25-80 vol. %.

4. The electrical insulating paper as claimed in claim 1, wherein the second particles are arranged on the two opposing sides of the electrical insulating paper and are in touch contact with one another, whereby a network is formed from the second particles on the two opposing sides of the electrical insulating paper.

5. The electrical insulating paper as claimed in claim 1, wherein the thermal conductivity of the second particles at 20 C. is at least 10 W/mK.

6. The electrical insulating paper as claimed in claim 1, wherein the second particles have a particle size of at least 5 m and at most 150 m.

7. The electrical insulating paper as claimed in claim 1, wherein a ratio of a mean particle size of the first particles to a mean particle size of the second particles is at least 3.

8. The electrical insulating paper as claimed in claim 1, wherein a ratio of a mean particle size of the first particles to a mean particle size of the second particles is 0.2-1.5.

9. The electrical insulating paper as claimed in claim 1, wherein the second particles comprise aluminum oxide and/or boron nitride.

10. The electrical insulating paper as claimed in claim 1, wherein the electrical insulating paper comprises a functionalizing agent which increases attractive interactions between the second particles.

11. A method for producing an electrical insulating paper, comprising: mixing a dispersion made of first flaky particles, which comprise layered silicates, and of second flaky particles, which have a thermal conductivity at 20 C. of at least 1 W/mK, and a carrier fluid; producing a sediment by sedimentation of the dispersion, whereby the first and the second particles are arranged substantially in a layered and plane-parallel manner in the sediment; removing the carrier fluid from the sediment; and finishing the electrical insulating paper.

12. An electrical insulating tape comprising: an electrical insulating paper as claimed in claim 1, and a carrier.

13. An electrical insulating body comprising: an electrical insulating paper as claimed in claim 1, wherein the electrical insulating paper is impregnated using an impregnating resin which comprises nanoscale and/or microscale inorganic particles.

14. The electrical insulating body as claimed in claim 13, wherein the inorganic particles of the impregnating resin comprise aluminum oxide, aluminum hydroxide, silicon dioxide, titanium dioxide, rare earth oxide, alkali metal oxide, and/or metal nitride.

15. A method of electrically insulating components, comprising: electrically insulating current-conducting or potential-conducting components using an electrical insulating body as claimed in claim 13.

16. The electrical insulating paper as claimed in claim 3, wherein the second particles are provided in a volume proportion in relation to the electrical insulating paper of 50-80 vol. %.

17. The electrical insulating paper as claimed in claim 5, wherein the thermal conductivity of the second particles at 20 C. is at least 25 W/mK.

18. The electrical insulating paper as claimed in claim 7, wherein a ratio of a mean particle size of the first particles to a mean particle size of the second particles is at least 5.

19. The electrical insulating paper as claimed in claim 8, wherein a ratio of a mean particle size of the first particles to a mean particle size of the second particles is 0.2-0.8.

20. The electrical insulating body as claimed in claim 13, wherein the electrical insulating paper is impregnated using an impregnating resin which comprises nanoscale and/or microscale inorganic particles, wherein the inorganic particles are substantially spherical.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Embodiments of the electrical insulating tape according to the invention will be described hereafter on the basis of schematic drawings.

[0057] FIG. 1 shows a cross section of an impregnable electrical insulating paper according to an embodiment the invention.

[0058] FIG. 2 shows a cross section of an impregnable electrical insulating paper according to another embodiment the invention.

DETAILED DESCRIPTION OF INVENTION

[0059] FIG. 1 shows a cross section of the impregnable electrical insulating paper 1 according to the invention. The electrical insulating paper 1 is porous and comprises mica particles 3 and aluminum oxide particles 5. The mica particles 3 have a mean particle size which is greater than a mean particle size of the aluminum oxide particles 5. The aluminum oxide particles 5 are therefore smaller than the mica particles 3. The aluminum oxide particles 5 are provided in a sufficiently high volume proportion in relation to the electrical insulating paper 1 that most of the aluminum oxide particles 5 are in touch contact with one or more further aluminum oxide particles 5. A network is thus formed from the aluminum oxide particles 5, which connects the two opposing broad sides of the electrical insulating paper 1 to one another. The electrical insulating paper 1 thus has a particularly high thermal conductivity.

[0060] FIG. 2 shows a cross section of the impregnable electrical insulating paper 11 according to the invention. The electrical insulating paper 11 is porous and comprises mica particles 13 and aluminum oxide particles 15. The mica particles 13 have a mean particle size which is less than the mean particle size of the aluminum oxide particles 15. The aluminum oxide particles 15 are therefore larger than the mica particles 13. The aluminum oxide particles 15 form a supporting mechanical network in the electrical insulating paper 11. The electrical insulating paper 11 thus has a high mechanical stability and a high strength.