Polyimide composite aerogel, preparation method and application of polyimide composite aerogel as solar evaporator

A composite aerogel, polyimide technology, applied in the direction of solar thermal power generation, solar collectors, solar collectors in specific environments, etc. Solar energy conversion efficiency and other issues, to achieve high-efficiency solar evaporation rate and purification capacity, excellent hydrophilic performance and high temperature resistance, and broad application prospects.

Pending Publication Date: 2021-12-07
HEFEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the airgel prepared by this method has an interconnected three-dimensional network structure, which is not conducive to water transpiration, thus limiting the water transport in the process of solar-driven water evaporation to a certain extent.
[0003] Polyimide airgel has excellent mechanical properties and high temperature resistance, and has a very wide range of applications in aerospace and other fields, but its hydrophobicity, low solar energy conversion efficiency and other defects seriously restrict the application of this type of airgel. Applications in solar evaporators
The hydrophilic properties of polyimide airgel can be improved by adding hydrophilic nanoparticles and grafting hydrophilic functional groups on the surface; by adding metal particles, carbon-based materials (such as carbon nanotubes, graphene oxide, etc.) , semiconductor materials, etc. can improve the light-to-heat conversion efficiency of polyimide airgel; by optimizing the design of the airgel synthesis process, the polyimide airgel can be endowed with a low-bending vertical tube structure, which can effectively enhance transpiration And improve the transport rate of water, these technological measures help to obtain the airgel solar evaporator with excellent comprehensive performance, but based on the preparation of polyimide airgel solar evaporator and its application in the field of sewage treatment and seawater desalination There are few reports on the application of

Method used

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  • Polyimide composite aerogel, preparation method and application of polyimide composite aerogel as solar evaporator
  • Polyimide composite aerogel, preparation method and application of polyimide composite aerogel as solar evaporator
  • Polyimide composite aerogel, preparation method and application of polyimide composite aerogel as solar evaporator

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 1.35g of polyamic acid and 1.485ml of triethylamine into 54ml of deionized water. After stirring and dissolving completely, pour the solution into a mold, place it in a four-way freezer for 30 minutes, and then transfer it to a vacuum After being processed in a freeze dryer for 72 hours, the sample was taken out and placed in a tube furnace for imidization reaction under the protection of nitrogen. The imidization condition is to heat the sample from room temperature to 80°C, 150°C and 250°C in sections at a rate of 8°C / min, and keep warm for 1 hour in each section to obtain polyimide airgel.

Embodiment 2

[0029] Step 1: Dissolve 0.12 g of tris powder in 100 ml of deionized water and adjust the pH of the solution to 4.5 with dilute hydrochloric acid. Then the solution was transferred to a three-necked flask, and 0.5 g of hydroxylated boron nitride, 0.2 g of dopamine hydrochloride and 0.12 g of ammonium persulfate were added thereto according to the mass ratio. After the above mixed solution was uniformly stirred by ultrasonic, it was stirred and reacted in a water bath at 60°C for 10 hours, then filtered and washed with deionized water, and dried at 80°C for 10 hours to obtain dopamine-modified boron nitride.

[0030] Step 2: Add 1.08g of polyamic acid and 1.485ml of triethylamine to 54ml of dopamine-modified boron nitride dispersion with a concentration of 5mg / ml, wherein the mass of polyamic acid and dopamine-modified boron nitride The ratio is 80:20.

[0031] After stirring and dissolving completely, pour the solution into the mold, place it in a four-directional freezer for...

Embodiment 3

[0033] Step 1: Dissolve 0.12 g of tris powder in 100 ml of deionized water and adjust the pH of the solution to 4.5 with dilute hydrochloric acid. Then the solution was transferred to a three-necked flask, and 0.5 g of hydroxylated boron nitride, 0.2 g of dopamine hydrochloride and 0.12 g of ammonium persulfate were added thereto according to the mass ratio. After the above mixed solution was uniformly stirred by ultrasonic, it was stirred and reacted in a water bath at 60°C for 10 hours, then filtered and washed with deionized water, and dried at 80°C for 10 hours to obtain dopamine-modified boron nitride.

[0034] Step 2: Add 1.08g of polyamic acid into a beaker containing 40.5ml of dopamine-modified boron nitride dispersion with a concentration of 5mg / ml and 13.5ml of hydroxylated carbon nanotube dispersion with a concentration of 5mg / ml. And 1.485 ml of triethylamine was added thereto and stirred. Wherein, the mass ratio of polyamic acid, dopamine-modified boron nitride a...

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Abstract

The invention discloses polyimide composite aerogel, a preparation method and application of the polyimide composite aerogel as a solar evaporator, and relates to the field of solar-driven water evaporation aerogel and preparation thereof. The polyimide composite aerogel is formed by uniformly dispersing dopamine modified boron nitride and hydroxylated carbon nanotubes in a polyimide matrix, and is of a low-bending vertical tube pore structure. The preparation method comprises the following steps: firstly, carrying out surface modification treatment on boron nitride by adopting dopamine, then adding polyamic acid into a mixed solution of dopamine modified boron nitride and hydroxylated carbon nanotubes, carrying out freeze forming by using liquid nitrogen as a cold source through a four-directional process, and sequentially carrying out vacuum freeze drying and imidization to prepare the composite aerogel. The composite aerogel has excellent hydrophilicity, high temperature resistance and efficient water transportation capacity and photothermal conversion capacity. As a solar evaporator, the composite aerogel has efficient solar evaporation rate and purification capacity on sewage containing high-concentration metal ions, and has wide application prospects in the fields of sewage treatment and seawater desalination.

Description

technical field [0001] The invention relates to the field of solar-driven water evaporation airgel and its preparation, in particular to a polyimide composite airgel, a preparation method and its application as a solar evaporator. Background technique [0002] With the continuous deepening of the industrialization process, the problem of water pollution is becoming more and more serious. Effective use of abundant and clean solar energy for sewage evaporation purification and seawater desalination is one of the important ways to solve the problem of clean water. At present, the photothermal conversion materials used for solar water evaporation mainly include membrane materials, hydrogels, and aerogels. Among them, aerogels have been widely used because of their low density, high porosity, and abundant network-like porous channels. focus on. Airgel with a special pore structure can be obtained through structural design to increase the transport rate of water, and the evapora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L79/08C08K9/04C08K7/00C08K3/38C08K3/04F24S20/20
CPCC08J9/28F24S20/20C08J2379/08C08J2205/026C08K9/04C08K7/00C08K2003/385C08K3/041Y02E10/40Y02A20/142
Inventor 鲁红典汪日圆陈浩然陈芳琳孟威明杨伟
Owner HEFEI UNIV
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