Preparation method of biomass boron nitride nanosheet modified polyimide aerogel

A technology of polyimide and boron nitride, which is applied in the field of preparation of biomass boron nitride nanosheets modified polyimide aerogels, can solve the problem of slow energy exchange rate between phase change materials and the outside world, aerogels Poor mechanical strength, poor thermal conductivity and other problems, to achieve excellent light-to-heat conversion performance, improve thermal conductivity, and improve mechanical properties

Pending Publication Date: 2022-04-26
广西高而美节能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Two-dimensional sheet material modified polyimide airgel is applied to the adsorption of phase change materials, which can solve the problems of slow energy exchange rate between phase change materials and the outside world, and poor mechanical strength of general airgel.
This method of preparing polyimide airgel is easy to operate, environmentally friendly and has excellent mechanical strength and good thermal stability, but due to the poor thermal conductivity of polyimide, it is difficult to apply to energy storage and heat storage Composite material field

Method used

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  • Preparation method of biomass boron nitride nanosheet modified polyimide aerogel
  • Preparation method of biomass boron nitride nanosheet modified polyimide aerogel
  • Preparation method of biomass boron nitride nanosheet modified polyimide aerogel

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Embodiment 1

[0047] This embodiment one discloses a preparation method of biomass boron nitride nanosheet modified polyimide airgel, comprising the following steps:

[0048] Step A1: first add 1 g sodium lignosulfonate to 50 mL deionized water, and disperse it evenly under ultrasonic treatment with a power of 300 W for 2 minutes, then add 1 g hexagonal boron nitride and stir for a while, then perform ultrasonic stripping in a water bath, which is used for ultrasonic stripping in a water bath The ultrasonic power is 300 W, the temperature is 25 °C, and the time is 12 h; after the ultrasonic stripping in the water bath is completed, the obtained boron nitride suspension is poured into a preset centrifuge tube for centrifugation to remove the unstripped bulk nitride. Boron particles were centrifuged at a rate of 2500 r / min, time of 15 min, and temperature of 20°C to prepare a suspension of modified boron nitride nanosheets, which was finally placed in low-temperature refrigeration for later us...

Embodiment 2

[0054] This embodiment 2 discloses a preparation method of biomass boron nitride nanosheet modified polyimide airgel, comprising the following steps:

[0055] Step A1: First add 1 g of acid-type sophorolipids into 50 mL of deionized water, and disperse it evenly under ultrasonic treatment with a power of 200W for 5 minutes, then add 2 g of hexagonal boron nitride and stir for a while, then perform ultrasonic peeling in a water bath The ultrasonic power used was 300 W, the temperature was 25 °C, and the time was 6 h; after the water bath ultrasonic stripping was completed, the obtained boron nitride suspension was poured into a preset centrifuge tube for centrifugation to remove the unstripped bulk nitrogen. The boron nitride particles were centrifuged at a rate of 3000 r / min, a time of 15 min, and a temperature of 25°C to prepare a suspension of modified boron nitride nanosheets, which was finally stored in low temperature storage for later use.

[0056] Step A2: First, add 0....

Embodiment 3

[0061] This embodiment three discloses a preparation method of biomass boron nitride nanosheet modified polyimide airgel, comprising the following steps:

[0062] Step A1: First add 1 g of sodium rosin sulfonate to 100 mL of deionized water, and disperse it evenly under ultrasonic treatment at a power of 300 W for 10 minutes, then add 2 g of hexagonal boron nitride and stir for a while, then perform ultrasonic peeling in a water bath, and ultrasonic peeling in a water bath The ultrasonic power used was 500 W, the temperature was 25 °C, and the time was 24 h; after the water bath ultrasonic stripping was completed, the obtained boron nitride suspension was poured into a pre-set centrifuge tube for centrifugation to remove the unstripped large particles. Block boron nitride particles were centrifuged at a rate of 2000 r / min, time of 15 min, and temperature of 20°C to prepare a suspension of modified boron nitride nanosheets, which was finally stored in low temperature storage for...

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Abstract

The invention discloses a preparation method of biomass boron nitride nanosheet modified polyimide aerogel, which comprises the following steps: respectively taking a pre-prepared modified boron nitride nanosheet suspension and a pre-prepared polyamide acid suspension according to a predetermined proportion, uniformly mixing under ultrasound, and then freeze-drying to remove moisture to obtain modified polyamide acid aerogel, thereby obtaining the biomass boron nitride nanosheet modified polyimide aerogel. And finally, initiating imidization in an inert atmosphere at a high temperature, and converting into the biomass boron nitride nanosheet modified polyimide aerogel. The material has the advantages of high thermal conductivity, stable thermal performance, good photo-thermal conversion performance and excellent mechanical performance.

Description

technical field [0001] The invention relates to the technical fields of ceramic filler, polyimide, biomass composite material and engineering thermophysics, in particular to a preparation method of biomass boron nitride nanosheet modified polyimide airgel. Background technique [0002] Since the last century, people have gradually realized the sharp reduction of global oil resource reserves and the deterioration of the environment and climate, especially the power consumption of HVAC and its impact on the global greenhouse effect cannot be underestimated. Organic phase change material is a material that can absorb and release heat energy in the liquid phase and solid phase conversion. It is widely used in buildings after being adsorbed by airgel, which can greatly reduce building energy consumption. [0003] Since the discovery of two-dimensional nanosheet materials, researchers have attracted extensive attention, such as graphene, zirconium phosphate, boron nitride, molybde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L79/08C08K9/04C08K3/38
CPCC08J9/28C08J2379/08C08K9/08C08K2003/385C08J2205/026
Inventor 丁小江施永康杨庆成孙军林祥明赖长明招就权汤志均
Owner 广西高而美节能科技有限公司
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