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A preparation method of hyperbranched polymer modified boron nitride thermally conductive and insulating composite material

A hyperbranched polymer and composite material technology, which is applied in the field of preparation of hyperbranched polymer modified boron nitride thermally conductive and insulating composite materials, can solve the problem of reducing the inherent thermal conductivity of BN fillers, limited thermal conductivity enhancement rate of composite materials, BN and Solve problems such as weak matrix interaction, achieve the effect of improving interfacial compatibility, excellent mechanical properties, and good processing performance

Active Publication Date: 2022-06-21
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the chemical bonding on the surface of the filler will destroy the original structure of the filler, thereby reducing the intrinsic thermal conductivity of the BN filler, resulting in a limited thermal conductivity enhancement rate of the composite.
With the help of non-covalent interactions between various functional surfactants (polythiophene, polyvinylpyrrolidone, etc.) Complicated and small in size, it has limited effect on improving dispersion
The patent application No. 202110725733.1 discloses a method for modifying boron nitride nanotubes by hyperbranched polymer HB(A-M) through hydrogen bond interaction, but the interaction between the modified BN and the matrix is ​​weak, and high addition It will greatly deteriorate the mechanical properties of composite materials

Method used

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  • A preparation method of hyperbranched polymer modified boron nitride thermally conductive and insulating composite material
  • A preparation method of hyperbranched polymer modified boron nitride thermally conductive and insulating composite material
  • A preparation method of hyperbranched polymer modified boron nitride thermally conductive and insulating composite material

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Embodiment 1

[0034] Embodiments 1 to 9 are methods for non-covalent modification of BN by using hyperbranched polymers containing both epoxy groups and polycyclic aromatic groups at the ends to obtain hyperbranched polymer-modified boron nitride; Examples 10-24 are methods for preparing thermally conductive and insulating composite materials by using hyperbranched polymer modified boron nitride in Example 1; Comparative Examples 1-4 are prepared by using unmodified boron nitride and commercial silica as thermally conductive fillers A method of thermally conducting insulating composite materials.

[0035] Example 1:

[0036] A preparation method of hyperbranched polymer modified boron nitride, comprising the steps:

[0037] (1) 4,4'-biphenol (3.73g, 20mmol), trimethylolpropane triglycidyl ether (18.14g, 60mmol) and tetrabutylammonium bromide (1.93g, 6mmol) were added in sequence In a single-necked flask, after reacting at 100 ° C for 6 hours, the epoxy value was titrated by the hydrochlor...

Embodiment 2

[0040] A preparation method of hyperbranched polymer modified boron nitride, comprising the steps:

[0041] (1) 4,4'-biphenol (3.73g, 20mmol), trimethylolpropane triglycidyl ether (18.14g, 60mmol) and tetrabutylammonium bromide (1.93g, 6mmol) were added in sequence In a single-necked flask, after reacting at 100 ° C for 6 hours, the epoxy value was titrated by the hydrochloric acid acetone method to 0.38, 1-pyrene butyric acid (4.46 g, 8.5 mmol) was added to the reaction mixture, and the system was continued at 100 ° C. The reaction was carried out for 4 hours.

[0042] After the reaction was over, it was precipitated in excess hot water to obtain a viscous yellow solid, which was then redissolved with THF. The above dissolution-precipitation was repeated three times, and finally the obtained precipitate was washed with a large amount of deionized water, and then vacuum-dried at 50° C. for 12 hours to obtain a hyperbranched polyether containing both epoxy groups and polycycli...

Embodiment 3

[0045] A preparation method of hyperbranched polymer modified boron nitride, comprising the steps:

[0046] (1) 4,4'-biphenol (3.73g, 20mmol), trimethylolpropane triglycidyl ether (18.14g, 60mmol) and tetrabutylammonium bromide (1.93g, 6mmol) were added in sequence In a single-necked flask, after reacting at 100 ° C for 6 hours, the epoxy value was titrated by the hydrochloric acid acetone method to 0.38, and 1-pyrene butyric acid (7.35 g, 25.5 mmol) was added to the reaction mixture, and the system continued at 100 ° C. The reaction was carried out for 4 hours. After the reaction was over, it was precipitated in excess hot water to obtain a viscous yellow solid, which was then redissolved with THF. The above dissolution-precipitation was repeated three times, and finally the obtained precipitate was washed with a large amount of deionized water, and then vacuum-dried at 50° C. for 12 hours to obtain a hyperbranched polyether containing both epoxy groups and polycyclic aromat...

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Abstract

The invention discloses a method for preparing a hyperbranched polymer-modified boron nitride heat-conducting and insulating composite material. The preparation method comprises the following steps: (1) adding hyperbranched polymers, boron nitride fillers and organic solvents into a container , centrifuged and dried to obtain hyperbranched polymer modified boron nitride after ultrasonic treatment; (2) the hyperbranched polymer modified boron nitride prepared in step (1) and matrix resin, curing agent, curing agent accelerator mixing and curing to obtain the thermally conductive and insulating composite material. The invention reduces the processing viscosity of the composite material, improves the processing performance of the composite material, improves the dispersion of boron nitride and its interface compatibility with the resin matrix, and prepares a composite material with high thermal conductivity and excellent mechanical properties. composite material.

Description

technical field [0001] The invention relates to the technical field of insulating composite materials, in particular to a preparation method of a hyperbranched polymer-modified boron nitride thermally conductive insulating composite material. Background technique [0002] With the development of electronic components towards integration and miniaturization, their internal heating power increases sharply, which seriously affects the working efficiency and service life of electronic devices and electronic equipment. According to the US Air Force avionics statistics, about 55% of the damage of electronic components is caused by the increase of temperature. Therefore, the effective heat dissipation of electronic devices has become an urgent problem to be solved, and the development of electronic packaging materials with high thermal conductivity has become the key to solving this problem. [0003] Polymers are widely used in electronic packaging due to their low cost, light wei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/08C08L63/02C08L61/10C08L63/00C08K3/38C08K9/04
CPCC08K3/38C08K9/08C08L79/08C08K2003/385C08L63/00C08L61/06
Inventor 李小杰梁雪魏玮刘晓亚
Owner JIANGNAN UNIV
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