Non-hydrogen evolving siloxane-based lubricant composition

• US 5,431,832 A
• Filed: 07/23/1993
• Issued: 07/11/1995
• Est. Priority Date: 07/23/1993
• Status: Expired due to Fees

• Current Assignee: Rhodia Incorporated
• Original Assignee: Rhone Poulenc Specialty Chemicals Co (Bayer AG)
• Inventors: Fanelli, Joseph J., Crowe, Angela M., Rodriguez, Joyce A., Freedman, David M.
• Primary Examiner(s): Johnson, Jerry D.
• Application Number:
  US08/096,336
• Time in Patent Office: 718 Days
• Field of Search: 252/49.5, 252/49.6, 106/38.22
• US Class Current: 508/208
• CPC Class Codes: C10M 107/50 containing silicon
• CPC Class Codes: C10M 129/36 containing hydroxy groups
• CPC Class Codes: C10M 139/04 having a silicon-to-carbon bond, e.g. silanes
• CPC Class Codes: C10M 145/14 Acrylate; Methacrylate
• CPC Class Codes: C10M 145/36 etherified
• CPC Class Codes: C10M 145/38 esterified
• CPC Class Codes: C10M 145/40 Polysaccharides, e.g. cellulose
• CPC Class Codes: C10M 155/02 Monomer containing silicon
• CPC Class Codes: C10M 173/02 not containing mineral or fatty oils
• CPC Class Codes: C10M 2201/02 Water
• CPC Class Codes: C10M 2207/124 containing hydroxy groups; Ethers thereof
• CPC Class Codes: C10M 2209/084 Acrylate; Methacrylate
• CPC Class Codes: C10M 2209/104 of alkylene oxides containing two carbon atoms only
• CPC Class Codes: C10M 2209/108 etherified
• CPC Class Codes: C10M 2209/109 esterified
• CPC Class Codes: C10M 2209/12 Polysaccharides, e.g. cellulose, biopolymers
• CPC Class Codes: C10M 2227/04 having a silicon-to-carbon bond, e.g. organo-silanes
• CPC Class Codes: C10M 2229/02 Unspecified siloxanes; Silicones
• CPC Class Codes: C10M 2229/04 Siloxanes with specific structure
• CPC Class Codes: C10M 2229/041 containing aliphatic substituents
• CPC Class Codes: C10M 2229/042 : containing aromatic substituents
• CPC Class Codes: C10M 2229/043 : containing carbon-to-carbon double bonds
• CPC Class Codes: C10M 2229/044 : containing silicon-to-hydrogen bonds
• CPC Class Codes: C10M 2229/045 : containing silicon-to-hydroxyl bonds
• CPC Class Codes: C10M 2229/046 : containing silicon-oxygen-carbon bonds
• CPC Class Codes: C10M 2229/047 : containing alkylene oxide groups
• CPC Class Codes: C10M 2229/048 : containing carboxyl groups
• CPC Class Codes: C10M 2229/05 : containing atoms other than silicon, hydrogen, oxygen or carbon
• CPC Class Codes: C10M 2229/051 : containing halogen
• CPC Class Codes: C10M 2229/052 : containing nitrogen
• CPC Class Codes: C10M 2229/053 : containing sulfur
• CPC Class Codes: C10M 2229/054 : containing phosphorus
• CPC Class Codes: C10N 2020/01 : Physico-chemical properties
• CPC Class Codes: C10N 2040/00 : Specified use or application for which the lubricating composition is intended
• CPC Class Codes: C10N 2040/30 : Refrigerators lubricants or compressors lubricants
• CPC Class Codes: C10N 2040/32 : Wires, ropes or cables lubricants
• CPC Class Codes: C10N 2040/34 : Lubricating-sealants
• CPC Class Codes: C10N 2040/36 : Release agents or mold release agents
• CPC Class Codes: C10N 2040/38 : Conveyors or chain belts
• CPC Class Codes: C10N 2040/40 : Generators or electric motors in oil or gas winning field
• CPC Class Codes: C10N 2040/42 : Flashing oils or marking oils
• CPC Class Codes: C10N 2040/44 : Super vacuum or supercritical use
• CPC Class Codes: C10N 2040/50 : Medical uses
• CPC Class Codes: C10N 2050/01 : Emulsions, colloids, or micelles

Abstract

A siloxane-based lubricant composition contains a mixture of nonreactive and reactive polydimethylsiloxanes, crosslinker and sufficient amounts of surfactant and water to provide an emulsion. The composition contains no methyl hydrogen silane, dimethyl hydrogen silane and/or polymethyl hydrogen siloxane and therefore releases no hydrogen gas during storage or during use.

Claims

1. A non-hydrogen evolving siloxane-based lubricant composition containing no methyl hydrogen silane, dimethyl hydrogen silane and/or polymethyl hydrogen siloxane comprising:

(a) at least one nonreactive polydimethylsiloxane possessing a viscosity of from about 50 to about 30 million centistokes at 25°

C.;

b) at least one hydroxy and/or alkoxy terminated reactive polydimethylsiloxane possessing a viscosity of from about 15 to about 5 million centistokes at 25°

C.;

c) at least one crosslinker;

d) at least one surfactant; and

,

e) water,

with nonreactive polydimethylsiloxane (a) being present at a level of from about 20 to about 95 percent by weight of combined nonreactive polydimethylsiloxane (a) and reactive polydimethylsiloxane (b), reactive polydimethylsiloxane (b) being present at a level of from about 5 to about 80 percent by weight of combined nonreactive polydimethylsiloxane (a) and reactive polydimethylsiloxane (b), crosslinker (c) being present at a level of from about 0.01 to about 5 percent by weight of reactive polydimethylsiloxane (b) and surfactant (d) and water (e) being present in amounts sufficient to provide an emulsion.

2. The lubricant composition of claim 1 wherein nonreactive polydimethylsiloxane (a) contains at least one nonreactive polydimethylsiloxane (i) possessing a viscosity of at least 100,000 centistokes at 25°

C. and at least one nonreactive polydimethylsiloxane (ii) possessing a viscosity of less than 100,000 centistokes at 25°

C.

3. The lubricant composition of claim 2 wherein nonreactive polydimethylsiloxane (i) possesses a viscosity of from about 10 to about 25 million centistokes at 25°

C. and nonreactive polydimethylsiloxane (ii) is selected from the group consisting of nonreactive polydimethylsiloxanes possessing a viscosity of from about 50 to about 200 centistokes at 25°

C., nonreactive polydimethylsiloxanes possessing a viscosity of from about 10,000 to about 50,000 centistokes at 25°

C. and combinations thereof.

4. The lubricant composition of claim 2 wherein the weight ratio of nonreactive polydimethylsiloxane (i) to nonreactive polydimethylsiloxane (ii) is from about 1:

10 to about 10;

1.

5. The lubricant composition of claim 2 wherein the weight ratio of nonreactive polydimethylsiloxane (i) to nonreactive polydimethylsiloxane (ii) is from about 1:

5 to about 5;

1.

6. The lubricant composition of claim 2 wherein the weight ratio of nonreactive polydimethylsiloxane (i) to nonreactive polydimethylsiloxane (ii) is from about 1:

10 to about 10;

1.

7. The lubricant composition of claim 3 wherein the weight ratio of nonreactive polydimethylsiloxane (i) to nonreactive polydimethylsiloxane (ii) is from about 1:

5 to about 5;

1.

8. The lubricant composition of claim 1 wherein crosslinker (c) possesses a viscosity of from about 50 to about 10,000 centistokes at 25°

C.

9. The lubricant composition of claim 1 wherein crosslinker (c) is selected form the group consisting of organotrialkoxysilane, organotriacyloxysilane, tetraalkyl silicate and combinations thereof.

10. The lubricant composition of claim 1 wherein crosslinker (c) is methyltrimethoxysilane.

11. The lubricant composition of claim 1 wherein nonreactive polydimethylsiloxane (a) is present in the lubricant composition at a level of from about 40 to about 75 weight percent of the total weight of nonreactive polydimethylsiloxane (a) and reactive polydimethylsiloxane (b), reactive polydimethylsiloxane (b) is present at a level of from about 25 to about 60 weight percent of the total weight of nonreactive polydimethylsiloxane (a) and reactive polydimethylsiloxane (b) and crosslinker (c) is present at a level of from about 0.02 to about 2 percent by weight of reactive polydimethylsiloxane (b).

12. The lubricant composition of claim 1 containing a polymeric film former.

13. The lubricant composition of claim 12 wherein the polymeric film former is an acrylic film former.

14. The lubricant composition of claim 1 containing at least one additional component distinct from the components a), b), c), d), and e), in the aforementioned claim selected from the group consisting of a crosslinking catalyst, a lubricant in addition to that recited in the aforementioned claim, air bleed agent, defoaming agent, thickening agent which functions as a thickener, filler or stabilizer, preservative and combinations thereof.

15. The lubricant composition of claim 14 containing a polymeric film former.