| abstract |
The invention relates to the technical field of polyurea materials, and discloses an insulating and thermally conductive film of nanometer boron nitride modified polyurea, comprising the following formulation raw materials and components: modified nanometer tin modified boron nitride, polyetheramine, HDI- Trimer, 2,4,6-trimethyl-1,3-phenylenediamine, modifier. The insulating and thermally conductive film of nano-boron nitride modified polyurea uses sodium hydroxide to etch nano-boron nitride to hydroxylate the surface of nano-boron nitride, deposit a layer of nano-tin on the surface of nano-boron nitride, and nitride The electron-deficient B in boron reacts with the amino group in aminoethylidene diphosphonic acid to graft nanoboron nitride with aminoethylidene diphosphonic acid. The polyurea polymer has a high degree of hydrogen bonding and strong hydrogen bonding force. The volume resistivity and insulating properties of polyurea are improved, and aminoethylidene bisphosphonic acid and nano-tin improve the dispersion and compatibility of nano-boron nitride in polyurea coating film, and uniformly dispersed nano-boron nitride can significantly Enhance the insulating properties and thermal conductivity of polyurea films. |