Solid insulation material

Patent metadata

Field	Value
Publication number	US-10778058-B2
Application number	US-201716083341-A
Country	US
Kind code	B2
Filing date	Feb 8, 2017
Priority date	Mar 9, 2016
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

Various embodiments may include a solid insulation material, e.g. in tape form, the use thereof in a vacuum impregnation process, and/or an insulation system produced therewith and also an electrical machine having the insulation system, for the medium- and high-voltage sector. Some examples include rotating electrical machines in the medium- and high-voltage sector and also semifinished products for electrical switchgear. The solid insulation material and the insulation system produced therewith are characterized in that it can be produced in an anhydride-free manner, wherein the curing catalyst is, for example, an adduct of a 1H-imidazole and/or 1H-imidazole derivative with a compound containing oxirane groups.

First claim

What is claimed is:

1. An insulation system prepared in a vacuum impregnation process, the insulation system comprising:
an anhydride-free impregnating agent; and
a solid insulation material comprising:
a carrier;
a barrier material;
a curing catalyst; and
a tape adhesive;

wherein the curing catalyst and the tape adhesive are inert to one another at standard atmospheric conditions, but react with one another in the presence of the impregnating agent at a pressure and a temperature associated with the vacuum impregnation process and gel in a time between 1 to 15 hours, wherein the temperature is between 20 degrees Celsius and 100 degrees Celsius; and
the curing catalyst comprises a product of a reaction of a 1H-imidazole and/or 1H-imidazole derivative with a compound containing oxirane groups with 1 to 4 oxirane functionalities per molecule.

2. The insulation system as claimed in claim 1 , wherein the compound containing oxirane groups has 4 oxirane functionalities per molecule.

3. The insulation system as claimed in claim 1 , wherein the compound containing oxirane groups comprises a glycidyl compound.

4. The insulation system as claimed in claim 1 , wherein the compound containing oxirane groups is liquid at room temperature.

5. The insulation system as claimed in claim 1 , wherein the curing catalyst comprises an adduct of one or more 1H-acid dinitrogen heterocycles and/or 1H-acid trinitrogen heterocycles with a compound containing oxirane groups.

6. The insulation system as claimed in claim 1 , wherein the compound containing oxirane groups is a compound selected from the following group of compounds:
monoglycidyl ether and/or ester compound (n=1),
diglycidyl ether and/or ester compound (n=2),
triglycidyl ether and/or ester compound (n=3),
tetraglycidyl ether and/or ester compound (n=4), and
mixtures thereof.

7. The insulation system as claimed in claim 1 , wherein the curing catalyst has a nitrogen density D in a range from 1 to 15 mmol/g.

8. The insulation system as claimed in claim 1 , wherein the curing catalyst comprises a compound containing oxirane groups and an adduct of at least one of the following:
1H-2-methylimidazole (CAS no. 693-98-1),
1H-2-ethylimidazole (CAS no. 1072-62-4),
1H-4-ethyl-2-phenylimidazole,
1H-3,5-dimethylpyrazole,
1H-imidazole (CAS no. 288-32-4),
1H-4(5)-methylimidazole (CAS no. 822-36-6),
1H-2-ethyl-4-methylimidazole (CAS no. 931-36-2),
1H-4-methyl-2-phenylimidazole (CAS no. 827-43-0),
1H-4-phenylimidazole (CAS no. 670-95-1),
1H-5-methyl-2-phenylimidazole-4-methanol (CAS no. 13682-32-1),
1H-pyrazole (CAS no. 288-13-1),
1H-3-phenylpyrazole (CAS no. 2458-26-6),
1H-5-methylpyrazole,
1H-3,4-dimethylpyrazole (CAS no. 2820-37-3),
1H-3,5-dimethylpyrazole (CAS no. 67-51-6),
1H-3-tert-butylpyrazole (CAS no. 15802-80-9), and/or
1H-4-ethylpyrazole (CAS no. 17072-38-7).

9. The insulation system as claimed in claim 1 , wherein the curing catalyst comprises 1-4 covalently bonded hydroxyl groups per molecule.

10. The insulation system as claimed in claim 1 , wherein the tape adhesive comprises an addition product of a bisphenol, diol, triol, and/or higher alcohol (A(OH)n), with a cyclohexene oxide and/or a cyclohexene oxide derivative (Cy), wherein A(OH)n comprises at least one compound selected from the following group of compounds:
monoethylene glycol (C2H4)(OH)2, butanediols (C4H8)(OH)2, butenediols (C4H6)(OH)2, butynediol (C4H4)(OH)2, polyethylene glycols H(OC2H4)x(OH)2 with x=1 to 5000, propylene glycol (C3H6)(OH)2, polypropylene glycols H(OC3H6)x(OH)2 with x=1 to 5000, diethylene glycol (C2H80)(OH)2, propanediols (C3H6)(OH)2, neopentyl glycol (C5H10)(OH)2, cyclopentanediols (C5H8)(OH)2, cyclopentenediols (C5H6)(OH)2, glycerol (C3H5)(OH)3, pentanediols (C5H10)(OH)2, pentaerythritol (C5H8)(OH)4, hexanediols (C6H12)(OH)2, hexylene glycols (C6H12)(OH)2, heptanediols (C7H14)(OH)2, octanediols (C8H16)(OH)2, polycaprolactone diols, polycaprolactone triols, hydroquinone (C6H4)(OH)2, resorcinol (C6H4)(OH)2, (pyro)catechol (C6H4)(OH)2, rucinol (C10H12)(OH)2, triethylene glycol (C6H12)(OH)2, fully aromatic, partially hydrogenated and/or fully hydrogenated bisphenol A (C15H14)(OH)2, (C15H28)(OH)2, bisphenol F (C13H10)(OH)2, bisphenol S (C12H802S)(OH)2, tricyclodecane dimethanol (C12H18)(OH)2, and glycerol carbonate (C4H5)(OH)1.

11. The insulation system as claimed in claim 1 , wherein the tape adhesive comprises a compound selected from the following group of compounds:
tricyclodecane dimethanol (CAS no. 26896-48-0 or 26160-83-8),
trimethylolpropane (CAS no. 77-99-6),
dendritic, hydroxy-functional polymers
(CAS no. 326794-48-3 or 462113-22-0),
polycaprolactone triols (CAS no. 37625-56-2), and
polycaprolactone tetrols (CAS no. 35484-93-6).

12. The insulation system as claimed in claim 1 , wherein the curing catalyst is less than 10 wt % of the solid insulation material.

13. The insulation system as claimed in claim 1 , wherein the tape adhesive is within a range of 1 to 30 wt % of the solid insulation material.

14. The insulation system material as claimed in claim 1 , wherein the carrier comprises a film, a woven material, and/or a nonwoven material.

15. The insulation system as claimed in claim 1 , wherein the carrier comprises a perforated film.

16. The insulation system as claimed in claim 1 , further comprising a particulate barrier material.

17. The insulation system as claimed in claim 1 , wherein the particulate barrier material comprises platelet-shaped barrier material particles.

18. The insulation system as claimed in claim 16 , wherein the particles of the barrier material include a coating.

19. The insulation system as claimed in claim 18 , wherein the coating comprises a metal oxide.

20. The insulation system as claimed in claim 18 , wherein the coating comprises doping.

Assignees

• Siemens Ag

Inventors

• Huber Jürgen
• Schirm Dieter
• Übler Matthias

Classifications

• B32B2307/304

  Insulating · CPC title

• B32B2260/021

  Fibrous or filamentary layer · CPC title

• H01B3/04

  mica · CPC title

• H02K15/12

  Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines · CPC title

• C09J7/30

  characterised by the adhesive composition · CPC title