Peeling or exfoliating boron nitride nanoplatelets, methods of making, and applications in reinforced polyurea composites

By preparing and modifying boron nitride nanosheets using mechanochemical methods, the problems of insufficient mechanical properties and electrical insulation in polyurea materials were solved, achieving a highly efficient and environmentally friendly reinforcement effect and improving the overall performance of polyurea composite materials.

CN116750731BActive Publication Date: 2026-02-06SHENYANG AEROSPACE UNIVERSITY
4 Cites 0 Cited by

Patent Information

Application Number
CN202310713921.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-16
Publication Date
2026-02-06
Estimated Expiration
2043-06-16

AI Technical Summary

Technical Problem

Existing polyurea materials, under certain coating thickness conditions, have mechanical properties and electrical insulation that are difficult to meet actual requirements. Furthermore, conventional boron nitride nanosheets have poor dispersibility in polymer matrices, are prone to agglomeration, and have low exfoliation efficiency and pollute the environment.

Method used

Boron nitride nanosheets with uniform thickness and large specific surface area were prepared by solvent-free exfoliation of boron nitride nanosheets using a mechanochemical method and modified with m-phenylenediamine. These nanosheets were then used to reinforce polyurea composites and form strong interfacial interactions.

Benefits of technology

It significantly improves the mechanical properties and electrical insulation of polyurea materials, with marked improvements in tensile strength, elongation at break, impact resistance, and volume resistivity, achieving a highly efficient and environmentally friendly enhancement effect.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The application relates to a kind of exfoliated or exfoliation modified boron nitride nanosheet and its preparation method and the application of reinforcing polyurea composite material, wherein the exfoliation modified boron nitride nanosheet, the thickness is 2.31+ / -0.14nm, and the surface amino grafting rate is 3~5%.The exfoliated boron nitride nanosheet (B-BN) is prepared by using mechanical chemical energy, solvent-free high-efficiency exfoliation, and the exfoliation modified boron nitride nanosheet (M-BN) is prepared by using m-xylylenediamine (MXDA) to modify the exfoliated boron nitride nanosheet (B-BN) by ball milling.The exfoliated boron nitride nanosheet has a larger specific surface area, which improves the dispersibility in the polyurea matrix;In addition to the large specific surface area of the exfoliation modified boron nitride nanosheet, the surface also contains amino groups, which can be linked with the isocyanate component by covalent bond, improve the interfacial action with the polyurea system, and enhance the mechanical properties, impact resistance and electrical insulation of the polyurea elastomer.
Need to check novelty before this filing date? Find Prior Art