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High-filling-capacity hexagonal boron nitride nanosheet/fiber/polymer blocky composite material and preparation method thereof

A technology of hexagonal boron nitride and composite materials, which is applied in the field of preparation of high-filling hexagonal boron nitride nanosheet/fiber/polymer block composite materials, which can solve the problems of low thermal conductivity, deterioration of mechanical properties and processing performance of composite materials, etc. problems, to achieve high mechanical strength, facilitate large-scale implementation, and simple preparation process

Active Publication Date: 2020-07-17
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, in order to further improve the thermal conductivity of the composite material, it is necessary to add a large amount of high thermal conductivity filler (>50wt%) in the system to improve the thermal conductivity of the composite material in all directions, but due to the poor dispersion of the filler in the matrix Uniform, this increase in thermal conductivity is less efficient and usually comes at the expense of significantly worsening the mechanical and processability of the composite

Method used

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  • High-filling-capacity hexagonal boron nitride nanosheet/fiber/polymer blocky composite material and preparation method thereof
  • High-filling-capacity hexagonal boron nitride nanosheet/fiber/polymer blocky composite material and preparation method thereof
  • High-filling-capacity hexagonal boron nitride nanosheet/fiber/polymer blocky composite material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0042] Step 1: Disperse 5 g of hexagonal boron nitride nanosheets into 0.5 L of water. At this time, the dispersion solvent is water, the concentration of the boron nitride solution is 10 g / L, and ultrasonic treatment is performed for 3 hours to obtain a dispersion of hexagonal boron nitride nanosheets; Add 100mL of cellulose nanocrystal solution with a concentration of 10g / L to the dispersion of hexagonal boron nitride nanosheets, stir for 24h, place the resulting mixture in a -50°C ultra-low temperature freezer for 2h, and then Freeze-dry in a freeze dryer for 48 hours at a temperature of -50°C and a pressure of 30Pa to obtain a boron nitride nanosheet / cellulose nanocrystal hybrid filler;

[0043] Step 2: 15g boron nitride nanosheet / cellulose nanocrystalline hybrid filler, 4.32g bisphenol A epoxy resin, 3.67g methyltetrahydrophthalic anhydride (curing agent) and 0.08g2,4,6-tri( Dimethylaminomethyl) phenol (catalyst) is added in the agate artificial mortar, grinds and mixes e...

Embodiment 2

[0049] Step 1: Disperse 7.5g of hexagonal boron nitride nanosheets into 0.5L of water solvent, the concentration of boron nitride solution is 15g / L, ultrasonic treatment for 3h, to obtain hexagonal boron nitride nanosheet dispersion; Add 100mL of microcrystalline cellulose solution with a concentration of 15g / L to the boron nanosheet dispersion, stir for 48h, place the resulting mixture in a -50°C ultra-low temperature refrigerator for 2h, and then place it in a freeze-dry Freeze-drying in the machine for 48 hours at a temperature of -50°C and a pressure of 30Pa to obtain hexagonal boron nitride nanosheet / microcrystalline cellulose hybrid filler;

[0050] Step 2: Mix 15g of hexagonal boron nitride nanosheet / microcrystalline cellulose hybrid filler, 4.32g of bisphenol A epoxy resin, 3.67g of methyltetrahydrophthalic anhydride (curing agent) and 0.08g of 2,4,6-tris (Dimethylaminomethyl) phenol (catalyst) joins in the agate artificial mortar, grinds and mixes evenly to obtain the...

Embodiment 3

[0055] Step 1: Place 500mL of microcrystalline cellulose solution with a concentration of 5g / L in an ultra-low temperature refrigerator at -50°C for 2 hours, and then place it in a freeze dryer for 48 hours to freeze-dry at -50°C , the pressure is 30Pa to obtain microcrystalline cellulose, which is then placed in a mortar and ground into powder;

[0056] Step 2: 2.5g microcrystalline cellulose powder in step 1, 15g boron nitride nanosheet filler, 4.32g bisphenol A epoxy resin, 3.67g methyltetrahydrophthalic anhydride (curing agent) and 0.08g2,4 , 6-tris(dimethylaminomethyl)phenol (catalyst) was added in an agate artificial mortar, ground and mixed uniformly to obtain hexagonal boron nitride nanosheet / microcrystalline cellulose-epoxy resin mixture;

[0057] Step 3: Put the mixture of hexagonal boron nitride nanosheets / microcrystalline cellulose-epoxy resin in step 2 into a polytetrafluoroethylene ball mill jar, and mix evenly in a planetary ball mill, wherein the speed of the b...

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Abstract

The invention relates to a high-filling-capacity hexagonal boron nitride nanosheet / fiber / polymer blocky composite material and a preparation method thereof. The high-filling-capacity hexagonal boron nitride nanosheet / fiber / polymer blocky composite material comprises hexagonal boron nitride nanosheets, fibers and a polymer matrix, the fibers are connected with the hexagonal boron nitride nanosheetsin different laminated layers to form a hexagonal boron nitride nanosheet-fiber hybrid filler network; and the sum of the hexagonal boron nitride nanosheet and the fiber accounts for 65-80% of the total mass of the material. By constructing a high-proportion filled hexagonal boron nitride nanosheet / fiber three-dimensional network in a polymer matrix, the composite material has good processabilityand excellent mechanical properties.

Description

technical field [0001] The invention discloses a method for preparing a high-filling hexagonal boron nitride nanosheet / fiber / polymer block composite material. It belongs to the technical field of functional materials. Background technique [0002] With the trend of miniaturization and integration of transistors in microelectronic devices, a lot of heat will be generated inside them. Therefore, it is more urgent and important to seek efficient thermal management materials to ensure the reliability of devices. Due to the advantages of easy processing, light weight, and low cost, thermally conductive polymer materials have great development potential in the field of thermal management materials. Unfortunately, most polymers have very low intrinsic thermal conductivity, greatly reducing the lifetime and reliability of electrical and electronic equipment. Therefore, in order to improve the thermal conductivity of polymers, it is necessary to add a high proportion of inorganic f...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L63/02C08L1/02C08L1/04C08K9/00C08K7/00C08K3/38B29B13/10B02C19/08B02C17/10B29C43/02
CPCC08L63/00B29B13/10B02C19/08B02C17/10B29C43/02C08K2201/011C08K2003/385C08L1/04C08K9/00C08K7/00C08K3/38C08L1/02
Inventor 薛彦明付坤杨靖文翟庆洪唐成春
Owner HEBEI UNIV OF TECH
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