Use of nanoparticle compositions as heat transfer fluids in battery or other electrical equipment systems

Patent metadata

Field	Value
Publication number	US-12415944-B2
Application number	US-202017616769-A
Country	US
Kind code	B2
Filing date	Jul 13, 2020
Priority date	Jul 17, 2019
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

The invention relates to the use of a nanoparticle composition as a heat transfer fluid in battery or other electrical equipment systems. The electrical equipment can be in particular electric batteries, electric motors, electric vehicle transmissions, electric transformers, electric capacitors, fluid-filled transmission lines, fluid-filled power cables, computers and power electronics such as electric power converters.

First claim

The invention claimed is:

1. A nanoparticle heat transfer fluid composition obtained by milling a mixture, the mixture comprising one or more nanoparticle compound(s) (A) and one or more amorphous polymer compound(s) (B),
(A) wherein the one or more nanoparticle compound(s) (A) is selected from the group consisting of
metal or metalloid nitride nanoparticle;
multi or single walled carbon nanotubes;
carbon black;
a metal chalcogenide having a molecular formula MX 2 , wherein M is a metallic element selected from the group consisting of titanium (Ti), vanadium (V), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), zirconium (Zr), niobium (Nb), molybdenum (Mo), tantalum (Ta), tungsten (W), osmium (Os), and combinations thereof, and X is a chalcogen element selected from the group consisting of sulfur(S), oxygen (O), and combinations thereof;
or a mixture thereof, and

(B) wherein the one or more amorphous polymer compound(s) (B) is obtained by polymerizing a monomer composition comprising:
a) 1 to 30% by weight, based on the total weight of the monomer composition, of one or more functional monomer selected from the list consisting of:
a1) aminoalkyl (meth)acrylates and aminoalkyl (meth)acrylamides;
a2) nitriles of alkyl (meth)acrylic acid and other nitrogen-containing alkyl (meth)acrylates;
a3) (meth)acrylates of ether alcohols;
a4) oxiranyl alkyl (meth)acrylate;
a5) phosphorus-, boron- and/or silicon-containing alkyl (meth)acrylates;
a6) heterocyclic alkyl (meth)acrylates;
a7) vinyl halides;
a8) vinyl esters;
a9) vinyl monomers containing aromatic groups;
a10) heterocyclic vinyl compounds;
a11) vinyl and isoprenyl ethers;
a12) methacrylic acid and acrylic acid, and

b) from 30 to 79% by weight of one or more alkyl (meth)acrylate monomer, wherein each of the alkyl group of the one or more alkyl (meth)acrylate monomer is independently linear, cyclic or branched and comprises from 1 to 40 carbon atoms, based on the total weight of the monomer composition, and
c) from 20 to 60% by weight of the reaction product of one or more ester of (meth)acrylic acid and one or more hydroxylated hydrogenated polybutadiene having a number-average molecular weight (M n ) of from 500 to 10,000 g/mol, based on the total weight of the monomer composition,

and wherein the weight ratio of the one or more nanoparticle compound (A) to the one or more amorphous polymer compound(s) (B) is from 9:1 to 1:5.

2. The nanoparticle heat transfer fluid composition according to claim 1 , wherein the one or more hydroxylated hydrogenated polybutadiene of component c) has a number-average molecular weight (M n ) of 1,500 to 2,100 g/mol, determined by gel permeation chromatography using polybutadiene calibration standards according to DIN 55672-1 with tetrahydrofuran as eluent.

3. The nanoparticle heat transfer fluid composition according to claim 1 , wherein the one or more amorphous polymer compound(s) (B) has a weight-average molecular weight (M w ) of 10,000 to 1,000,000 g/mol, determined by gel permeation chromatography using polymethylmethacrylate calibration standards and tetrahydrofuran as eluent.

4. The nanoparticle heat transfer fluid composition according to claim 1 , wherein the one or more amorphous polymer compound(s) (B) is obtained by polymerizing a monomer composition comprising:
a) from 1 to 30% by weight of the one or more functional monomer as component a), based on the total weight of the monomer composition; and
b1) from 30 to 60% by weight, by weight of one or more alkyl (meth)acrylate of formula (I), as first component b):

wherein R is hydrogen or methyl, R 1 means a linear, branched or cyclic alkyl residue with 1 to 8 carbon atoms, based on the total weight of the monomer composition, and

b2) from 0 to 20% by weight, of one or more alkyl (meth)acrylate of formula (II), as second component b):

wherein R is hydrogen or methyl, R 2 means a linear, branched or cyclic alkyl residue with 9 to 15 carbon atoms, based on the total weight of the monomer composition; and

b3) from 0 to 20% by weight, of one or more alkyl (meth)acrylate of formula (III), as third component b):

wherein R is hydrogen or methyl, R 3 means a linear, branched or cyclic alkyl residue with from 16 to 40 carbon atoms, based on the total weight of the monomer composition; and

c) from 20 to 60% by weight, of the reaction product of one or more ester of (meth)acrylic acid and one or more hydroxylated hydrogenated polybutadiene having a number-average molecular weight (M n ) of from 500 to 10,000 g/mol, based on the total weight of the monomer composition.

5. The nanoparticle heat transfer fluid composition according to claim 1 , wherein the weight ratio of the one or more nanoparticle compound(s) (A) to the one or more amorphous polymer compound(s) (B) is from 5:1 to 1:2.

6. The nanoparticle heat transfer fluid composition according to claim 1 , wherein the one or more amorphous polymer compound(s) (B) is obtained by polymerizing a monomer composition comprising:
a1) from 0.5 to 5% by weight of an aminoalkyl (meth)acrylamide as first component a), based on the total weight of the monomer composition;
a9) from 5 to 15% by weight of a vinyl monomer containing aromatic groups, as second component a), based on the total weight of the monomer composition;
b1) from 35 to 50% by weight of an alkyl (meth)acrylate monomer of formula (I), as first component b), based on the total weight of the monomer composition;
b2) from 1 to 10% by weight of an alkyl (meth)acrylate monomer of formula (II), as second component b), based on the total weight of the monomer composition;
c) from 30 to 50% by weight of an ester of a (meth)acrylic acid and a hydroxylated hydrogenated polybutadiene having a number-average molecular weight (Ma) of from 500 to 10,000 g/mol, as component c), based on the total weight of the monomer composition.

7. The nanoparticle heat transfer fluid composition according to claim 1 , wherein the weight contents of monomers a), b) and c) of the monomer composition sum up to 100% by weight, based on the total weight of the monomer composition.

8. The nanoparticle heat transfer fluid composition according to claim 1 , wherein the nanoparticle compound (A) is selected from the group consisting of hexagonal boron nitride (hBN) nanoparticle; carbon black, a metal chalcogenide having a molecular formula MX 2 wherein the metallic element M is molybdenum (Mo) or tungsten (W) and the chalcogen element X is sulfur(S); or a mixture thereof.

9. The nanoparticle heat transfer fluid composition according to claim 1 , wherein the nanoparticle composition further comprises a base fluid (C), which has a kinematic viscosity at 40° C. from 3 cSt to 30 cSt according to ASTM D-445 and a flash point of more than 110° C. according to ASTM D-93.

10. The nanoparticle heat transfer fluid composition according to claim 9 , wherein the base fluid is selected from the list consisting of an API Group I base oil, an API Group II base oil, an API Group III base oil, an API Group IV base oil, an API Group V base oil, or a mixture thereof.

11. The nanoparticle heat transfer fluid composition according to claim 9 , wherein the nanoparticle composition comprises from 85 to 99.9% by weight of a

Assignees

• Schrantz Raphaela
• Schrantz Cornelia
• Evonik Operations Gmbh

Inventors

• Fischer Ulrich
• Ness Daniel
• Wieber Stephan
• Hagemann Michael Gerhard
• Schmitt Günter
• Heberer Stefan
• Schrantz Jennifer
• Turhan Can Metehan

Classifications

• C08C19/00

  Chemical modification of rubber · CPC title

• C08K2003/385

  Binary compounds of nitrogen with boron · CPC title

• C08K3/38

  Boron-containing compounds · CPC title

• C08F236/06

  Butadiene · CPC title

• C08F220/60

  containing nitrogen in addition to the carbonamido nitrogen · CPC title