Solid coolant concentrates and production thereof

Patent metadata

Field	Value
Publication number	US-12180413-B2
Application number	US-202218549380-A
Country	US
Kind code	B2
Filing date	Mar 4, 2022
Priority date	Mar 10, 2021
Publication date	Dec 31, 2024
Grant date	Dec 31, 2024

Abstract

The present invention describes novel coolant concentrates and the production and use thereof.

First claim

The invention claimed is:

1. A process for producing a concentrate comprising not more than 15% by weight of water (A),
as inhibitors (C):
(C1) at least one inorganic compound selected from the group consisting of silicates, borates, nitrates, molybdates, and phosphates,
(C2a) optionally, benzoic acid as aromatic monocarboxylic acid,
(C3) at least one organic dicarboxylic acid having 4 to 20 carbon atoms,
(C4) at least one azole,

(D) optionally, at least one inorganic base,
(E) at least one other constituent selected from the group consisting of hard water stabilizers, defoamers, dyes, and bitter substances,
with the proviso that
a total proportion of the inhibitor components (C), inorganic base components (D), and other components (E), based on the overall composition, is 0.01% to 10% by weight,
a proportion of aliphatic monocarboxylic acids in the overall composition does not exceed 0.4% by weight,
a proportion of nitrites in the overall composition does not exceed 0.1% by weight, and
the remainder to 100% by weight is at least one alkylene glycol, alkylene glycol monoalkyl ether, or glycerol (B),
the process comprising:
admixing:
not more than 10% by weight of water (A), not more than 10% by weight of alkylene glycol, alkylene glycol monoalkyl ethers, and glycerol (B),
as inhibitors (C):
(C1) at least one inorganic compound selected from the group consisting of silicates, borates, nitrates, molybdates, and phosphates,
(C2a) optionally, benzoic acid as aromatic monocarboxylic acid,
(C3) at least one organic dicarboxylic acid having 4 to 20 carbon atoms,
(C4) at least one azole,
(D) optionally, at least one inorganic base,
(E) at least one other constituent selected from the group consisting of hard water stabilizers, defoamers, dyes, and bitter substances,
to form a solid composition,
with the proviso that
a total proportion of the inhibitor components (C), inorganic base components (D), and other components (E), based on the overall composition, is 90% to 95% by weight,
a proportion of aliphatic monocarboxylic acids in the overall composition does not exceed 1% by weight,
a proportion of nitrites in the overall composition does not exceed 0.25% by weight, and
a sum total of all components is always 100% by weight,
admixing the solid composition with an appropriate amount of the at least one alkylene glycol, alkylene glycol monoalkyl ether, or glycerol (B), hence obtaining a superconcentrate comprising
not more than 15% by weight of water (A), as inhibitors (C):
(C1) at least one inorganic compound selected from the group consisting of silicates, borates, nitrates, molybdates, and phosphates,
(C2a) optionally, benzoic acid as aromatic monocarboxylic acid,
(C3) at least one organic dicarboxylic acid having 4 to 20 carbon atoms,
(C4) at least one azole,

(D) optionally, at least one inorganic base,
(E) at least one other constituent selected from the group consisting of hard water stabilizers, defoamers, dyes, and bitter substances,
with the proviso that
the total proportion of the inhibitor components (C), inorganic base components (D), and other components (E), based on the overall composition, is 0.05% to 30% by weight,
the proportion of aliphatic monocarboxylic acids in the overall composition does not exceed 0.6% by weight,
the proportion of nitrites in the overall composition does not exceed 0.2% by weight, and
the remainder to 100% by weight is at least one alkylene glycol, alkylene glycol monoalkyl ether, or glycerol (B),
and then,
adding an appropriate amount of water (A), or alkylene glycol, alkylene glycol monoalkyl ether and glycerol (B), or both (A) and (B) thereto.

2. The process according to claim 1 , wherein component (B) is monoethylene glycol.

3. The process according to claim 1 , wherein component (C1) is a compound selected from the group consisting of silicates, borates, nitrates, and phosphates.

4. The process according to claim 1 , wherein no aromatic monocarboxylic acid is present.

5. The process according to claim 1 , wherein compound (C3) is a linear alkanedicarboxylic acid having 6 to 12 carbon atoms.

6. The process according to claim 1 , wherein compound (C3) is selected from the group consisting of succinic acid, maleic acid, fumaric acid, glutaric acid, adipic acid, pimelic acid (heptanedioic acid), azelaic acid (nonanedioic acid), sebacic acid (decanedioic acid), undecanedioic acid, dodecanedioic acid, alkyl-and alkenylsuccinic acids and -glutaric acids, 2-methylbutanedioic acid, 2-ethyl-3-methylbutanedioic acid, 2-ethylpentanedioic acid, 2-dodecylbutanedioic acid, 2-dodecenylbutanedioic acid, 2-phenylbutanedioic acid, 2-(p-methylphenyl) butanedioic acid, 2,2-dimethylbutanedioic acid, 2,3,4-trimethylpentanedioic acid, 2,2,3-trimethylpentanedioic acid, glutaconic acid (pent-2-enedioic acid), itaconic acid, hex-2-enedioic acid, hex-3-enedioic acid, 5-methylhex-2-enedioic acid, and 2,3-dimethylpent-2-enedioic acid.

7. The process according to claim 1 , wherein compound (C4) is selected from the group consisting of benzotriazole, tolyltriazole, (2-benzothiazylthio) acetic acid, 3-(2-benzothiazylthio) propionic acid, and 2-mercaptobenzothiazole.

8. The process according to claim 1 , wherein forming the solid composition comprises:
mixing components (A) to (E) in a suitable apparatus over a period of 5 minutes to 10 hours at 10 to 100° C., until a homogeneous mixture is formed,
optionally, sieving the homogeneous mixture, and
subsequently, processing to give shaped bodies.

9. The process for producing the concentrate according to claim 1 , which is a superconcentrate, comprising
not more than 15% by weight of water (A), as inhibitors (C):
(C1) at least one inorganic compound selected from the group consisting of silicates, borates, nitrates, molybdates, and phosphates,
(C2a) optionally, benzoic acid as aromatic monocarboxylic acid,
(C3) at least one organic dicarboxylic acid having 4 to 20 carbon atoms,
(C4) at least one azole,

(D) optionally, at least one inorganic base,
(E) at least one other constituent selected from the group consisting of hard water stabilizers, defoamers, dyes, and bitter substances,
with the proviso that
a total proportion of the inhibitor components (C), inorganic base components (D), and other components (E), based on the overall composition, is 0.05% to 30% by weight,
a proportion of aliphatic monocarboxylic acids in the overall composition does not exceed 0.6% by weight,
a proportion of nitrites in the overall composition does not exceed 0.2% by weight, and
the remainder to 100% by weight is at least one alkylene glycol, alkylene glycol monoalkyl ether, or glycerol (B),
the process comprising:
admixing the solid composition
with an appropriate amount of the at least one alkylene glycol, alkylene glycol monoalkyl ether, or glycerol (B).

10. The process according to claim 1 , the process comprising:
initially charging component (A) and/or (B),
adding the solid composition, and
mixing by energy input by shear energy.

11. The process according to claim 1 , wherein the composition comprises not more than 5% by weight of the water (A).

12. The process according to claim 1 , wherein the composition comprises not more than 5% by weight of the alkylene glycol, alkylene glycol monoalkyl ethers, and glycerol (B).

13. The process according to claim 1 , wherein the at least one azole (C4) is at least one triazole compound.

14. A process for producing a concentrate comprising not more than 15% by weight of water (A),
as inhibitors (C):
(C1) at least one inorganic compound selected from the group

Assignees

• Basf Se

Inventors

• Dietl Harald
• Nitzschke Uwe
• Sandor Mario
• Schmitz Ruediger

Classifications

• C23F11/188

  containing phosphates · CPC title

• C23F11/182

  Sulfur, boron or silicon containing compounds · CPC title

• C23F11/124

  Carboxylic acids · CPC title

• C23F11/149

  Heterocyclic compounds containing nitrogen as hetero atom · CPC title

• C09K5/10

  Liquid materials · CPC title