Title:
LUBRICANT COMPOSITION FOR AMMONIA BASED REFRIGERANTS WITH GOOD SEAL PERFORMANCE
Document Type and Number:
WIPO Patent Application WO2001068791
Kind Code:
A3
Abstract:
A problem with refrigeration systems using ammonia as the refrigerant and hydrocarbon lubricants is that the seals/gaskets of the systems have a tendency to harden and shrink. This can cause leakage of the refrigerant and eventually require disassembly of the equipment and replacement of the seals. The addition of a small amount polyether having an aromatic fragment of 6-18 carbon atoms or an aliphatic fragment of 10-22 carbon atoms can soften the seals and partially re-swell the seals solving the leakage problem and avoiding expensive maintenance costs. Alternatively a polyether of 1,2-butylene oxide which is more oil soluble than most other polyethers with a smaller Z group e.g. derived from alkanols of 1 to 9 carbon would be effective at reducing hardening and shrinkage.
Inventors:
RAJEWSKI THOMAS (US)
TOLFA JOHN C (US)
LI HSINHENG (US)
TOLFA JOHN C (US)
LI HSINHENG (US)
Application Number:
PCT/US2001/008381
Publication Date:
January 31, 2002
Filing Date:
March 15, 2001
Export Citation:
Assignee:
LUBRIZOL CORP (US)
RAJEWSKI THOMAS (US)
TOLFA JOHN C (US)
LI HSINHENG (US)
RAJEWSKI THOMAS (US)
TOLFA JOHN C (US)
LI HSINHENG (US)
International Classes:
C09K5/04; C10M101/02; C10M107/02; C10M129/16; C10M145/36; C10M169/04; C10M171/00; C10N20/02; C10N30/00; C10N30/08; C10N40/30; (IPC1-7): C10M171/00; C10M145/36; C10M169/04; C09K5/04
Domestic Patent References:
| WO2000005329A1 | 2000-02-03 |
Foreign References:
| US5595678A | 1997-01-21 | |||
| EP0989180A1 | 2000-03-29 | |||
| DE4431271A1 | 1996-03-14 | |||
| EP0861883A2 | 1998-09-02 |
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