Solid insulation material

Patent metadata

Field	Value
Publication number	US-10774244-B2
Application number	US-201615745530-A
Country	US
Kind code	B2
Filing date	May 19, 2016
Priority date	Jul 17, 2015
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

The present disclosure relates to insulation. Teachings thereof may be embodied in a solid insulation material, especially in tape form, the use thereof in a vacuum impregnation process and to an insulation system produced therewith, and also an electrical machine comprising the insulation system, especially for the medium- and high-voltage sector, namely for medium- and high-voltage machines, especially rotating electrical machines in the medium- and high-voltage sector, and to semifinished products for electrical switchgear. For example a solid insulation material with an anhydride-free impregnating agent may include: a carrier; a barrier material; a curing catalyst; and a tape adhesive. The curing catalyst and the tape adhesive are inert toward one another but react under the conditions of a vacuum impregnation process if combined with an anhydride-free impregnating agent having gelation times of 1 h to 15 h at impregnation temperature. The tape adhesive is free of oxirane groups and includes at least two free hydroxyl groups.

First claim

What is claimed is:

1. An insulation system, the system comprising:
a solid insulation material comprising:
a carrier;
a barrier material;
a curing catalyst; and
a tape adhesive;

an anhydride-free impregnating agent;
wherein the curing catalyst and the tape adhesive are inert toward one another at standard atmospheric conditions, but react under vacuum when combined with the impregnating agent in a vacuum impregnation process to form a mixture with gelation times of 1 h to 15 h at an impregnation temperature in a range between 20 degrees Celsius and 100 degrees Celsius;
wherein the tape adhesive comprises a carbon-based organic compound with at least two free hydroxyl groups and free of oxirane groups; and;
wherein the curing catalyst is selected from the group consisting of: cationic superacids and superacid salts.

2. The insulation system as claimed in claim 1 , wherein the tape adhesive within a temperature range from 60° C. to 70° C. shows a viscosity between 0.5 and 100 Pas.

3. The insulation system as claimed in claim 1 , wherein the tape adhesive does not melt or soften at a temperature below 100° C.

4. The insulation system of claim 1 , wherein the tape adhesive comprises tricyclodecanedimethanol.

5. The insulation system of claim 1 , wherein the tape adhesive comprises polyvinyl acetal.

6. The insulation system of claim 5 , wherein the polyvinyl acetal comprises the at least two free hydroxyl groups present as polyvinyl alcohol in an amount less than 35 mol %.

7. The insulation system as claimed in claim 1 , wherein the tape adhesive comprises at least one compound selected from the group consisting of ester polyols, polyester polyols, linear polyester polyols, branched polyester polyols, hydroxy-functional polyester polyols, hydroxy-functional dendritic polyester polyols, polyester polyols based on propionic acid or based on alkyl-substituted propionic acid, a polyester polyol based on a bis(hydroxyalkyl)propionic acid, a polyol based on 2,2-bis(hydroxymethyl)propionic acid.

8. The insulation system as claimed in claim 1 , further comprising a carrier comprising woven fabric, nonwoven fabric, or film.

9. The insulation system as claimed in claim 8 , comprising a perforated film.

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

11. The insulation system as claimed in claim 10 , wherein the particulate barrier material comprises barrier material particles at least partly in platelet form.

12. The insulation system as claimed in claim 11 , wherein the particles of the barrier material have been coated.

13. The insulation system as claimed in claim 12 , wherein the coating comprises a metal oxide.

14. The insulation system as claimed in claim 12 , wherein the coating has been doped.

15. The insulation system as claimed in claim 1 , wherein the tape adhesive amounts to from 1% to 30% by weight of a total weight of the insulation material.

16. The insulation system as claimed in claim 1 , wherein the curing catalyst comprises less than 10% by weight of a total weight of the insulation material.

Assignees

• Siemens Ag

Inventors

• Huber Jürgen
• Schirm Dieter
• Übler Matthias

Classifications

• H01B3/40

  epoxy resins · CPC title

• H02K3/40 Primary

  for high voltage, e.g. affording protection against corona discharges · CPC title

• H01B3/447

  from acrylic compounds · CPC title

• C09J7/21

  Paper; Textile fabrics · CPC title

• B32B2307/206

  Insulating · CPC title