Water-glycol hydraulic fluid compositions
| Title: | Water-glycol hydraulic fluid compositions |
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| Patent Number: | 9,695,380 |
| Publication Date: | July 04, 2017 |
| Appl. No: | 12/668902 |
| Application Filed: | July 02, 2008 |
| Abstract: | A morpholine-free water-hydraulic liquid composition includes water, a glycol, a polyglycol such as a polyalkylene glycol, an aliphatic carboxylic acid that contains from six to 14 carbon atoms, and a combination of amines and alkanolamines. |
| Inventors: | Greaves, Martin R. (Hirzel, CH) |
| Assignees: | Dow Global Technologies LLC (Midland, MI, US) |
| Claim: | 1. A morpholine-free water-hydraulic liquid composition, consisting of: water, a glycol, a polyglycol, decanoic acid, a combination of amines and alkanolamines, and optionally a primary alkanolamine selected from the group consisting of monoethanolamine, 2-amino-1,3-propanediol, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-ethyl-1,3-propanediol, tris(hydroxymethyl)-aminomethane and 2-amino-1-butanol, wherein the combination of amines and alkanolamines comprises 2-amino-2-methyl-1-propanol, N,N-dimethylethanolamine, and N,N-diethylethanolamine, wherein the composition has a pH equal to or greater than 9, and wherein the composition yields a total weight loss of ring and vanes in a modified Vickers Vane V104C pump test of less than 20 milligrams per 100 hours as measured in accord with ASTM D-7043 modified by using a one gallon reservoir, rather than a five gallon reservoir according to ASTM D-7043, stripping the pump subsequent to each test run and cleaning the stripped parts and rebuilding the pump, and conducting wear testing at a pressure of 2000 psig (14 MPa), a rotary speed of 1200 revolutions per minute (rpm), a bulk fluid temperature of 65° C. and a test duration of 100 hours, and wherein the composition has an initial reserve alkalinity from 145 milliliters to 200 milliliters, and wherein the polyglycol is a random copolymer of ethylene oxide and propylene oxide with an ethylene oxide content within a range of from 50 weight-percent to 90 weight-percent and a complementary content of propylene oxide within a range of from 10 weight-percent to 50 weight-percent in each case based upon total weight of ethylene oxide and propylene oxide, with complimentary amount of propylene oxide, when added to amount of ethylene oxide, equaling 100 percent by weight and wherein the composition has a water content from 30 to 54 percent by weight based upon total composition weight and wherein the composition has a polymer content from 10 to 20 percent by weight based upon total composition weight; and wherein the composition has from 0.5 to 1 percent by weight of 2-amino-2-methyl-1-propanol, from 0.1 to 2 percent by weight combined N,N-dimethylethanolamine, and N,N-diethylethanolamine; and from 0.5 to 2.5 percent by weight decanoic acid, all based upon total composition weight. |
| Claim: | 2. The composition of claim 1 wherein the decanoic acid is present in an amount sufficient to form an equilibrium acid-base salt complex with at least one amine. |
| Claim: | 3. The composition of claim 1 , wherein the primary alkanolamine is at least one of monoethanolamine and 2-amino-1-butanol. |
| Claim: | 4. The composition of claim 1 wherein the glycol is selected from the group consisting of ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, a “bottom glycols” fraction produced during manufacture of diethylene glycol, and butylene glycol, and the alkylene glycol is present in an amount within a range of from 30 percent by weight to 50 percent by weight, based upon total weight composition. |
| Claim: | 5. The composition of claim 1 wherein the polyglycol is prepared from a random mixed feed of ethylene oxide and propylene oxide onto an initiator selected from glycerol, pentaerythritol, trimethylolpropane or diethylene glycol. |
| Patent References Cited: | 2558030 June 1951 Zisman et al. 4390439 June 1983 Schwartz et al. 4390440 June 1983 Schwartz et al. 4434066 February 1984 Lewis 4493780 January 1985 Schwartz et al. 4588511 May 1986 Frentrup et al. 4797229 January 1989 Frentrup et al. 4855070 August 1989 Lewis 5773393 June 1998 Adams 265528 March 1989 0273460 July 1988 2048262 December 1980 |
| Other References: | International Search Report (PCT/US2008/068957). cited by applicant Totten, George E. et al., Water-Glycol Hydraulic Fluids, Handbook of Hydraulic Fluid Tecchnology, 2000, pp. 917-982, Chapter 18. cited by applicant Matlock, Paul L., et al., Polyalkylene Glycols, Synthetic Lubricants & High Performance Functional Fluids, 1993, pp. 101-123, Chapter 4. cited by applicant Verwendungsbeschraenkungen fuer wassermischbare, 2002, pp. 1-15. cited by applicant E.W. Flick, Corrosion Inhibitors, An Industrial Guide, 2nd Edition, 1993, Noyes Publications. cited by applicant Chinese Third Office Action dated Dec. 13, 2013; from Chinese counterpart Application No. 200890107577.5. cited by applicant Instructions to Chinese Third Office Action dated Jan. 16, 2014; from Chinese counterpart Application No. 200890107577.5. cited by applicant Chinese Response to Third Office Action dated Jan. 20, 2014; from Chinese counterpart Application No. 200890107577.5. cited by applicant |
| Primary Examiner: | Oladapo, Taiwo |
| Attorney, Agent or Firm: | Brooks, Cameron & Huebsch, PLLC |
| Accession Number: | edspgr.09695380 |
| Database: | USPTO Patent Grants |
| Language: | English |
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