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1. WO2020115177 - AQUEOUS METALWORKING FLUIDS AND METHODS FOR USING THE SAME

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[ EN ]

We claim:

1. An aqueous metalworking fluid composition comprising:

one or more water-soluble polymers, each having a kinematic viscosity at 40 °C of at least 5000 cSt and no cloud point within a temperature range of 20 °C to 80 °C, present in a total amount in the range of 0.5 wt% to 15 wt%; and

water, present in an amount of at least 70 wt%,

wherein the composition has a kinematic viscosity at 40 °C in the range of 1 cSt to 20 cSt, and wherein the one or more water-soluble polymers are dissolved in an aqueous phase of the aqueous metalworking fluid.

2. The composition of claim 1, wherein the composition is a substantially single-phase composition.

3. The composition of claim 1 or claim 2, having a kinematic viscosity at 40 °C in the range of 2 cSt to 10 cSt.

4. The composition of any of claims 1-3, wherein each of the one or more water-soluble polymers has a kinematic viscosity at 40 °C in the range of 10000 cSt to 25000 cSt.

5. The composition of any of claims 1-4, wherein each of the one or more water-soluble polymers has a viscosity index in the range of 200-800.

6. The composition of any of claims 1-5, wherein each of the water-soluble polymers has a kinematic viscosity at 100 °C of no more than 20000 cSt, e.g., no more than 15000 cSt or no more than 10000 cSt.

7. The composition of any of claims 1-6, wherein each of the water-soluble polymers has a kinematic viscosity at 100 °C in the range of 1000-10000 cSt.

8. The composition of any of claims 1-7, wherein each of the one or more water-soluble polymers has no cloud point within a temperature range of 0 °C to 100 °C.

9. The composition of any of claims 1-8, wherein each of the one or more water-soluble polymers is a copolymer of two or more of ethylene oxide, propylene oxide, and butylene oxide wherein ethylene oxide, propylene oxide and/or butylene oxide subunits make up at least 95%, e.g., at least 98% or even at least 99% of the mass of each of the one or more water-soluble polymers.

10. The composition of claim 9, wherein each of the one or more water-soluble polymers is a copolymer of ethylene oxide and propylene oxide.

11. The composition of claim 9 or claim 10, wherein in each of the one or more water-soluble polymers the ratio of ethylene oxide and propylene oxide is in the range of 25:75 to 75:25 by weight.

12. The composition of any of claims 9-11, wherein each of the one or more water-soluble polymers is a random copolymer.

13. The composition of any of claims 1-12, wherein the one or more water-soluble polymers are present in the composition in a total amount of 0.5 wt% to 5 wt%, based on the total weight of the composition.

14. The composition of any of claims 1-13, wherein each of the one or more water-soluble polymers has a Mw of 800 Da to 100 kDa.

15. The composition of any of claims 1-14, wherein water is present in the composition in an amount of at least 85%.

16. The composition of any of claims 1-15, further comprising one or more of pressure-protective additives, corrosion inhibitors, rust inhibitors, lubricity enhancers, friction modifiers, chelating agents, coupling agents, yellow metal inhibitors, esters, biocides, and combinations thereof present in the composition in an amount up to 15 wt%, based on the total weight of the composition.

17. The composition of any of claims 1-16, comprising

the one or more water-soluble polymers;

a corrosion- inhibiting combination comprising one or more carboxylic acids in an amount in the range of 0.1 wt% to 1 wt% and one or more amines in an amount in the range of 0.1 wt% to 2 wt%;

one or more yellow metal inhibitors (e.g., triazole) in an amount in the range of 0.01 wt% to 0.2 wt%;

optionally one or more pressure-protective additives (e.g., phosphate ester) in an amount of up to 0.25 wt%; and

optionally, a biocide in an amount in the range of 0.05 wt% to 0.25 wt%.

18. The composition of any of claims 1-17, substantially free of mineral oil and silicone oil.

19. A metalworking fluid concentrate comprising:

one or more water-soluble polymers, each having a kinematic viscosity at 40 °C of at least 5000 cSt and no cloud point within a temperature range of 20 °C to 80 °C, present in an amount in the range of 25 wt% to 70 wt%;

optionally, one or more of pressure-protective additives, corrosion inhibitors, rust inhibitors, lubricity enhancers, friction modifiers, chelating agents, coupling agents, yellow metal inhibitors, esters and biocides, present in the composition in a total amount up to 40 wt%; and water, present in an amount of at least 8 wt%,

wherein the one or more water-soluble polymers, optional additives when present, and the water are dissolved in one another to form a single aqueous phase.

20. A method of cold working a metal, the method comprising

contacting a surface of one or more working tools with a metalworking fluid composition of any of claims 1-18; and

forming a surface of a metal article to a desired shape with the one or more working tools in contact with the metalworking fluid composition.

21. The method of claim 10, wherein the forming is carried out at a temperature in the range of 0-60 °C.

22. The method of claim 20 or claim 21, wherein the cold working is a cold rolling, and wherein the one or more working tools is one or more working rolls.

23. A method of cold working a metal, the method comprising

obtaining a first portion of a metalworking fluid composition of any of claims 1-18;

contacting a surface of one or more working tools with the first portion of the metalworking fluid composition and forming a surface of a first metal article to a desired shape in contact with the first portion to generate a spent first portion;

treating the spent first portion with a concentrate of claim 19;

contacting the surface of one or more working tools with the treated first portion; and forming a surface of a second metal article to a desired shape in contact with the treated first portion.

24. The method of claim 23, the method further comprising measuring a viscosity of the spent first portion; and wherein based on the measured viscosity of the spent first portion, the treating of the spent first portion is with an amount of the concentrate sufficient to provide the treated first portion with a kinematic viscosity at 40 °C in the range of 1 cSt and 20 cSt.

25. A method of cold working a metal, the method comprising

dissolving an amount of a concentrate according to claim 19 in an aqueous fluid (e.g., water) to obtain a metalworking fluid composition of any of claims 1-18,

wherein the amount of the top-treat additive is sufficient to provide the metalworking fluid composition having a kinematic viscosity at 40 °C in the range of 1 cSt to 20 cSt; contacting a surface of one or more working tools with the metalworking fluid composition; and forming a surface of a metal article to a desired shape with the working tools in contact with the metal working fluid composition.