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

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 MX2, 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 (Mn) 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.