Polysiloxane additives for lubricants and fuels
A composition is disclosed that comprises: (A) a lubricant or a hydrocarbon fuel, and (B) at least one polysiloxane of the formula: M w D′ x D y M′ z where: w is 2-z; x is 0 to 50; y is 0 to 500; z is 0 to 2; M=Si(CH 3 ) 3 —O—; M′=R 1 —Si(CH 3 ) 2 O—; D=—Si(CH 3 ) 2 O—; D′=—Si(CH 3 )(R 1 )O—; and R 1 is an aliphatic or aromatic moiety linked to at least one silicon atom from siloxane and comprising at least one heteroatom.
1. A composition comprising:
(A) a lubricant or a hydrocarbon fuel, and
(B) at least one polysiloxane selected from the group consisting of polysiloxanes of the formulae (MD′M) 2 and M′D y M′
where:
y is 1 to 15;
M=Si(CH 3 ) 3 —O—;
M′=R 1 —Si(CH 3 ) 2 O—;
D=—Si(CH 3 ) 2 O—;
D′=—Si(CH 3 )(R 1 )O—; and
R 1 is R 3 —(C 2 H 4 O) 8 OC(O)CH 2 CH 2 R 2 or (R 3 )OC(O)CH 2 CH 2 SCH 2 CH 2 OC(O)(R 3 ), where R 2 is an aliphatic or aromatic radical and R 3 is an aromatic or aliphatic radical bearing a group reacting with the siloxane backbone.
2. The composition of claim 1 further comprising at least one additional additive selected from the group consisting of dispersants, detergents, rust inhibitors, antioxidants, metal deactivators, anti-wear agents, extreme pressure agents, antifoamants, friction modifiers, seal swell agents, demulsifiers, Viscosity Index improvers, and pour point depressants.
3. The composition of claim 1 further comprising at least one additional additive selected from the group consisting of zinc dialkyldithiophosphate, zinc diaryldithiophosphate, and zinc alkylaryldithiophosphate.
4. The composition of claim 1 wherein the lubricant is a lubricating oil.
5. A composition comprising:
(A) a lubricant, and
(B) at least one polysiloxane selected from the group consisting of polysiloxanes of the formulae (MD′M) 2 and M′D y M′
where:
y is 1 to 15;
M=Si(CH 3 ) 3 —O—;
M′=R 1 —Si(CH 3 ) 2 O—;
D=—Si(CH 3 ) 2 O—;
D′=—Si(CH 3 )(R 1 )O—; and
R 1 is R 3 —(C 2 H 4 O) 8 OC(O)CH 2 CH 2 R 2 or (R 3 )OC(O)CH 2 CH 2 SCH 2 CH 2 OC(O)(R 3 ), where R 2 is an aliphatic or aromatic radical and R 3 is an aromatic or aliphatic radical bearing a group reacting with the siloxane backbone.
6. The composition of claim 5 further comprising at least one additional additive selected from the group consisting of dispersants, detergents, rust inhibitors, antioxidants, metal deactivators, anti-wear agents, extreme pressure agents, antifoamants, friction modifiers, seal swell agents, demulsifiers, Viscosity Index improvers, and pour point depressants.
7. The composition of claim 5 further comprising at least one additional additive selected from the group consisting of zinc dialkyldithiophosphate, zinc diaryldithiophosphate, and zinc alkylaryldithiophosphate.
8. The composition of claim 5 wherein the lubricant is a lubricating oil.
9. A composition comprising:
(A) a hydrocarbon fuel, and
(B) at least one polysiloxane selected from the group consisting of polysiloxanes of the formulae (MD′M) 2 and M′D y M′
where:
y is 1 to 15;
M=Si(CH 3 ) 3 —O—;
M′=R 1 —Si(CH 3 ) 2 O—;
D=—Si(CH 3 ) 2 O—;
D′=—Si(CH 3 )(R 1 )O—; and
R 1 is R 3 —(C 2 H 4 O) 8 OC(O)CH 2 CH 2 R 2 or (R 3 )OC(O)CH 2 CH 2 SCH 2 CH 2 OC(O)(R 3 ) where R 2 is an aliphatic or aromatic radical and R 3 is an aromatic or aliphatic radical bearing a group reacting with the siloxane backbone.
10. A method for improving the anti-fatigue, anti-wear, and extreme pressure properties of a lubricant or a hydrocarbon fuel comprising adding thereto at least one polysiloxane selected from the group consisting of polysiloxanes of the formulae (MD′M) 2 and M′D y M′
where:
y is 1 to 15;
M=Si(CH 3 ) 3 —O—;
M′=R 1 —Si(CH 3 ) 2 O—;
D=—Si(CH 3 ) 2 O—;
D′=—Si(CH 3 )(R 1 )O—; and
R 1 is R 3 —(C 2 H 4 O) 8 OC(O)CH 2 CH 2 R 2 or (R 3 )OC(O)CH 2 CH 2 SCH 2 CH 2 OC(O)(R 3 ), where R 2 is an aliphatic or aromatic radical and R 3 is an aromatic or aliphatic radical bearing a group reacting with the siloxane backbone.
11. The method of claim 10 wherein the lubricant is a lubricating oil.