Metal-working fluid compositions and methods for making

Patent metadata

Field	Value
Publication number	US-11525102-B2
Application number	US-202117644496-A
Country	US
Kind code	B2
Filing date	Dec 15, 2021
Priority date	Dec 21, 2020
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

The disclosure relates to a biobased metal-working fluid (MWF) composition and method for making same, and more particularly metal-working fluid with biobased lubricants with improved emulsion stability. At least 50 wt. % of the base oil component in the MWF concentrate is a plant-derived liquid decarboxylated rosin acid oil (“DCR”). The DCR comprises 50 to 100 wt. % of tricyclic compounds having 18-20 carbon atoms, one or more C═C groups, and m/z (mass/charge) value of 220-280; an oxygen content of <5%; a density of 0.9 to 1.0 g/cm 3 at 20° C.; and an acid value of <10 mg KOH/g. The resulting MWF is characterized as having comparable if not better performance compared to a MWF containing only mineral oil (e.g., Group I or Group II).

First claim

The invention claimed is:

1. A metal-working fluid concentrate for use as an oil-in-water emulsion, comprising:
a base oil component in an amount of 5-90 wt. %, based on the total weight of the concentrate;
an emulsifier selected from any of the conventional anionic, cationic, nonionic, or amphoteric surfactants, in an amount of 0.1 to 15 wt. %;
at least an optional additive selected from saponifiers, pH buffers, preservatives, extreme pressure EP additives, corrosion inhibitors, anti-wear agents, metal deactivators, defoamers, anti-rust agents, deodorants, dyes, fungicides, bacteriocides, antioxidants, emulsion stabilizers, dispersion stabilizers in an amount of 0.1 to 15 wt. %;
wherein the base oil component contains at least 50% by weight of a decarboxylated rosin acid (DCR) based on the total weight of the base oil component, and remainder being oil selected from naphthenic, paraffin, bio-based oil, and mixtures thereof, and
wherein the DCR has:
a m/z (mass/charge) of 220-280 as measured by GC-FID-MS,
an oxygen content of <5%,
an acid value of <10 mg KOH/g; and

wherein the DCR comprises:
>50% by weight as tricyclic and polycyclic compounds having 18-20 carbon atoms,
>55% by weight of tricyclic compounds as aromatic and cycloaliphatic,
<45% by weight of tricyclic compounds as reactive double bond (C═C group).

2. The metal-working fluid concentrate of claim 1 , wherein the DCR has >25 wt. % aromatic content, >40 wt. % naphthenic content, and >15 wt. % paraffinic content, all based on total weight of the DCR.

3. The metal-working fluid concentrate of claim 1 , wherein the DCR has at least one of:
a Brookfield viscosity of >20 cSt at 40° C.;
an aniline point of at least 5° C.;
a pour point of less than 30° C.;
a sulfur content of <0.05 wt. %;
a Gardner color of <3; and
a flash point of <160° C.

4. The metal-working fluid concentrate of claim 1 , wherein the DCR comprises >30% by weight of tricyclic compounds as cycloaliphatic.

5. The metal working fluid concentrate of claim 1 , wherein the DCR comprises >60% by weight of tricyclic compounds as aromatics and cycloaliphatic.

6. The metal working fluid concentrate of claim 1 , wherein the DCR comprises <30% by weight of tricyclic compounds as reactive double bond.

7. The metal-working fluid concentrate of claim 6 , wherein the DCR comprises <10% by weight of tricyclic compounds as reactive double bond.

8. The metal working fluid concentrate of claim 1 , wherein the DCR has 30-60% wt. % aromatic content; >40 wt. % naphthenic content, and 20-35 wt. % paraffinic content, all based on total weight of the DCR.

9. The metal working fluid concentrate of claim 1 , wherein the concentrate is a Soluble Oil concentrate, and wherein the amount of the base oil component is 40-90 wt. % based on the total weight of the concentrate.

10. The metal-working fluid concentrate of claim 1 , wherein the concentrate is a Semi-synthetic Fluid concentrate, and wherein the amount of the base oil component is 5-40 wt. % based on the total weight of the concentrate.

11. The metal-working fluid concentrate of claim 1 , wherein the base oil component contains >50 wt. % DCR based on the total weight of the base oil component, and remainder is a Group I base oil.

12. The metal-working fluid concentrate of claim 1 , wherein the base oil component contains DCR and a Group I base oil in a weight of ratio ranging from 50:50 to 90:10.

13. A method of preparing a metal surface for subsequent working of the metal to fabricate articles therefrom, the method comprising:
diluting the MWF concentrate of claim 1 in water forming a metal-working fluid (MWF) as oil-in-water emulsion, for a water concentration of 80-99% based on the total weight of the MWF;
apply the oil-in-water emulsion as a substantially continuous layer onto the metal surface to deposit onto the metal surface an ultra-thin film of the metal working fluid.

14. A method of preparing a metal surface for subsequent working of the metal to fabricate articles therefrom, the method comprising:
providing a metal-working fluid (MWF) concentrate comprising:
a base oil component in an amount of 5-90 wt. %, based on the total weight of the concentrate;
an emulsifier selected from any of the conventional anionic, cationic, nonionic, or amphoteric surfactants, in an amount of 0.1 to 15 wt. %;
at least an optional additive selected from saponifiers, pH buffers, preservatives, extreme pressure EP additives, corrosion inhibitors, anti-wear agents, metal deactivators, defoamers, anti-rust agents, deodorants, dyes, fungicides, bacteriocides, antioxidants, emulsion stabilizers, dispersion stabilizers in an amount of 0.1 to 15 wt. %;
wherein the base oil component contains at least 50% by weight of a decarboxylated rosin acid (DCR) based on the total weight of the base oil component, and remainder being an oil selected from naphthenic, paraffin, bio-based oil, and mixtures thereof, and
wherein the DCR has:
a m/z (mass/charge) of 220-280 as measured by GC-FID-MS,
an oxygen content of <5%,
an acid value of <10 mg KOH/g; and

wherein the DCR comprises:
>50% by weight as tricyclic and polycyclic compounds having 18-20 carbon atoms,
>55% by weight of tricyclic compounds as aromatic and cycloaliphatic,
<45% by weight of tricyclic compounds as reactive double bond (C═C group).

15. The method of claim 14 , wherein the amount of tricyclic compounds as cycloaliphatic in the DCR is >30 wt. %.

16. The method of claim 14 , wherein the amount of tricyclic compounds as reactive double bond in the DCR is <30 wt. %.

17. The method of claim 14 , wherein the DCR has at least one of:
a Brookfield viscosity of >20 cSt at 40° C.;
an aniline point of at least 5° C.;
a pour point of less than 30° C.;
a sulfur content of <0.05 wt. %;
a Gardner color of <3; and
a flash point of <160° C.

18. The method of claim 14 , wherein the DCR has >25 wt. % aromatic, >40 wt. % naphthenic, and >15 wt. % paraffinic, all based on total weight of the DCR.

19. The method of claim 14 , wherein the DCR has 30-60% wt. % aromatic; >40 wt. % naphthenic, and 20-35 wt. % paraffinic, all based on total weight of the DCR.

20. The method of claim 14 , wherein the DCR comprises >60% by weight of tricyclic compounds as aromatics and cycloaliphatic.

Assignees

• Kraton Polymers Llc

Inventors

• Nelson Lloyd
• Gerritsen Roy
• Eduard Pieter

Classifications

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10M173/00 Primary

  Lubricating compositions containing more than 10% water · CPC title

• C10N2020/067

  Unsaturated Compounds · CPC title

• C10M105/02 Primary

  Well-defined hydrocarbons (petroleum fractions C10M101/02) · CPC title

• C10M2219/044

  Sulfonic acids, Derivatives thereof, e.g. neutral salts · CPC title