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

A heat transfer fluid comprising a dispersion, the dispersion comprising dispersed inorganic nanoparticles, and further comprising a dispersed polymer, wherein the dispersion is obtained by milling a mixture, the mixture comprising one or more inorganic nanoparticle compound (A) and one or more polymer compound (B),

• (A) wherein the one or more inorganic nanoparticle compound is selected from the group consisting of a metal or a metalloid oxide nanoparticle, a metal or a metalloid nitride nanoparticle, a metal or a metalloid carbide nanoparticle, and a mixture thereof,
• and
• (B) wherein the one or more polymer compound is obtained by polymerizing a monomer composition comprising:
• a) from 1 to 35% by weight, based on the total weight of the monomer composition, of one or more functional monomer selected from the group 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- and/or boron-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;
• and
• a12) methacrylic acid and acrylic acid,
• b) from 65 to 99% by weight of one or more alkyl (meth)acrylate monomer, wherein each 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,
• wherein the weight ratio of the one or more inorganic nanoparticle compound (A) to the one or more polymer compound (B) is 9:1 to 1:5, and
• the amount of monomers a) and b) of the monomer composition sum up to 100% by weight, based on the total weight of the monomer composition.