Granted Patent B2

US 12,344,703 · App. 17/627,108 · Granted Jul 1, 2025

Inventors: Cherif Ghoul (Raleigh, NC); Elio Perigo (Wendell, NC); Daniel Pierce Armstrong (Apex, NC); Kathryn F. Murphy (Raleigh, NC); Mohammad O. Tuhin (Houston, TX)

Assignee: HITACHI ENERGY LTD

C08G59/687C08G59/24C08G65/18

Abstract

Claims (29)

1. An electrical component comprising a photo radiation curable epoxy formulation, comprising:

1%-6% by weight of a photoinitiator;

3%-20% by weight of an accelerator;

at least 50% by weight of an epoxy, wherein the epoxy formulation after UV curing forms an electrical component exposed to a voltage differential, wherein the electrical component is formed by 3D printing the epoxy formulation; and

a filler comprising silica, mica, quartz, calcium carbonate, talc, alumina silicate, alumina, alumina trihydrate or calcium sulfate, wherein the filler is an amount up to 65% by volume.

2. The electrical component according to claim 1 , wherein the photoinitiator comprises a cationic photoinitiator.

3. The electrical component according to claim 2 , wherein the cationic photoinitiator comprises a diaryliodonium cation or a triarylsulfonium cation.

4. The electrical component according to claim 3 , wherein the diaryliodonium cation or the triarylsulfonium cation comprises a triarylsulfonium hexafluoroantimonate, diaryliodonium hexafluoroantimonate, diaryliodonium tetrakis[pentafluorophenyl] borate or high molecular weight sulfonium tetrakis[pentafluorophenyl] borate.

5. The electrical component according to claim 1 , wherein the photoinitiator comprises triarylsulfonium hexafluoroantimonate.

6. The electrical component according to claim 1 , wherein the accelerator comprises an alcohol, a diol or a polyol.

7. The electrical component according to claim 1 , wherein the accelerator comprises an oxetane.

8. The electrical component according to claim 7 , wherein the oxetane comprises 3-ethyl-3-oxetane methanol; oxetane-3-methanol; or 3-methyl-3-oxetane methanol.

9. The electrical component according to claim 7 , wherein the oxetane comprises bis[1-ethyl (3-oxetanyl)]methyl ether; 1,4-bis[(3-ethyl-3-oxetanylmethoxy) methyl]benzene; 3-ethyl-3-[(2-ethylhexyloxy) methyl]oxetane; dimethyloxetane; phenyloxetane; trimethylene oxide; methyl-3-oxetane; ethyl-3-oxetane; a long chain alkyl substituted oxetane; 3-hydroxyoxetane; 3,3-oxetanedimethanol; or 2,6-dioxaspiro3.3heptane.

10. The electrical component according to claim 1 , wherein the epoxy is a cycloaliphatic epoxy.

11. The electrical component according to claim 10 , wherein the cycloaliphatic epoxy comprises 3,4-epoxycyclohexylmethyl-3′,4′-epoxycyclohexane carboxylate; epoxycyclohexane; or a combination thereof.

12. The electrical component according to claim 1 , further comprising less than 5% by weight of an acrylate monomer, acrylated oligomer, acrylated resin or a combination thereof.

13. The electrical component according to claim 12 , having no portion of an acrylate.

14. The electrical component according to claim 1 , wherein the epoxy formulation after UV curing has a glass transition temperature of at least 120° C.

15. The electrical component according to claim 1 , wherein the epoxy formulation after UV curing has an electrical breakdown strength of at least 25 kV/mm.

16. The electrical component according to claim 15 , wherein the epoxy formulation after UV curing has an electrical breakdown strength of at least 40 kV/mm.

17. The electrical component according to claim 1 , wherein the epoxy formulation after UV curing has an electrical loss factor of less than 1%.

18. The electrical component according to claim 17 , wherein the epoxy formulation after UV curing has an electrical loss factor of less than 0.2%.

19. The electrical component according to claim 1 , wherein the electrical component comprises a bushing, a dielectric coating, a plug housing, or an insulating conduit.

20. The electrical component according to claim 1 , wherein the photoinitiator comprises 1.7%-4% by weight.

21. The electrical component according to claim 20 , wherein the photoinitiator comprises 1.7%-3% by weight.

22. The electrical component according to claim 1 , wherein the accelerator comprises 5%-15% by weight.

23. The electrical component according to claim 22 , wherein the accelerator comprises 5%-10% by weight.

24. The electrical component according to claim 1 , wherein the epoxy comprises at least 70% by weight.

25. The electrical component according to claim 24 , wherein the epoxy comprises at least 80% by weight.

Assignments (5)

Continuity (2)

References Cited (25)