Claims
- 1. A method of protecting electrical apparatus from damage due to overheating and for thereafter determining the location of said overheating, said apparatus including a gas stream and a monitor for detecting particles in said gas stream and for emitting a signal when said particles are detected comprising:
- (A) preparing a composition which comprises at least one non-metallic, non-ionic (covalent) organo-sulfur compound containing the group ##STR7## or mixtures thereof, and a solution of a resinous carrier curable at room temperature and stable at 60.degree. C., and unreactive with said organo-sulfur compound at its thermoparticulation temperature;
- (B) applying said composition to said electrical apparatus at positions exposed to said gas stream;
- (C) evaporating said solvent; and
- (D) monitoring said gas stream for the presence of particles therein.
- 2. A method according to claim 1 including the additional last step of inspecting said apparatus visually for blistered and darkened areas, after a signal has been emitted, to locate the area of overheating.
- 3. A method according to claim 1 including the additional last steps of collecting a sample of said gas stream after a signal has been emitted, and analyzing said sample.
- 4. A method according to claim 1 wherein ##STR8## group occurs in the group ##STR9##
- 5. A method according to claim 1 wherein said compound has the general formula: ##STR10## or mixtures thereof wherein each R is independently selected from hydrogen, alkyl to C.sub.8, aryl, aralkyl, or heterocyclic.
- 6. A method according to claim 1 wherein the amount of said compound is about 20 to about 250 phr and the amount of the solvent in said solution is about 25 to about 75% (by weight based on said resinous carrier).
- 7. A method according to claim 6 wherein the amount of said compound is about 40 to about 60 phr and the amount of said solvent is about 45 to about 55% (by weight based on said resinous carrier).
- 8. A method according to claim 1 wherein said resinous carrier is an epoxy resin.
- 9. A method according to claim 8 wherein said composition includes about 0.1 to about 3 phr of a drier for said epoxy resin.
- 10. A method according to claim 9 wherein said coating is prepared by first mixing said solution of resinous carrier and said drier and then mixing in said organo-sulfur compound.
- 11. A method according to claim 1 wherein the solvent in said solution is toluene.
- 12. A method according to claim 1 wherein said organo-sulfur compound is dispersed in said solution.
- 13. A method according to claim 1 wherein said resinous carrier is air-dryable.
- 14. A thermal detection system for electrical apparatus cooled by a gas stream, comprising a coating on a portion of said electrical apparatus exposed to said gas stream and a monitor for detecting the presence of particles in said gas stream, said coating comprising a solid layer of a cured resinous carrier containing a non-metallic, non-ionic (covalent) organo-sulfur compound containing the group ##STR11## or mixtures thereof, said resinous carrier being stable at 60.degree. C. and unreactive with said organo-sulfur compound at its thermoparticulation temperature.
- 15. A thermal detection system according to claim 14 wherein said ##STR12## group occurs in the group ##STR13##
- 16. A thermal detection system according to claim 14 wherein said compound has the general formula: ##STR14## or mixtures thereof wherein each R is independently selected from hydrogen, alkyl to C.sub.8, aryl, aralkyl, or heterocyclic.
- 17. A thermal detection system according to claim 14 wherein the amount of said compound is about 20 to about 250 phr.
- 18. A thermal detection system according to claim 17 wherein the amount of said compound is about 40 to about 60 phr.
- 19. A thermal detection system according to claim 14 wherein said resinous carrier is an epoxy resin.
- 20. A thermal detection system according to claim 19 wherein said coating includes about 0.1 to about 3 phr of a drier for said epoxy resin.
Parent Case Info
This is a division, of application Ser. No. 699,561 filed June 24, 1976, now U.S. Pat. No. 4,100,327.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3955417 |
Smith et al. |
May 1976 |
|
3957014 |
Phillips et al. |
May 1976 |
|
3973438 |
Smith et al. |
Aug 1976 |
|
4046733 |
Smith et al. |
Sep 1977 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
699561 |
Jun 1976 |
|