Preparation method of polymer aerogel
An aerogel and polymer technology, which is applied in the field of preparation of polymer aerogels, can solve the problems of low strength of silica aerogel, intolerance to water and organic solvents, etc., and achieves good tolerance and a preparation method. Simple, flexible effect
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example 1
[0021] Add polyvinylidene fluoride powder with a mass fraction of 5% to N,N-dimethylformamide, stir at 120°C for 1 hour at a speed of 300r / min to obtain a polyvinylidene fluoride solution, and place the polyvinylidene fluoride solution at 20°C After 24 hours, a liquid film with a thickness of 2000 microns was scraped off on the surface of the plate, and after standing at 0°C for 120 seconds, the plate was immersed in a coagulation bath for 30 minutes at room temperature. The liquid film on the plate formed a gel, and the gel was soaked in ethanol for 3 Tianhou carbon dioxide supercritical drying to obtain a specific surface area of 202m 2 / g, polyvinylidene fluoride airgel with a thermal conductivity of 0.034W / (m·K). figure 1 A photo of a sample of the polyvinylidene fluoride airgel prepared in Example 1. The prepared polymer airgel is a sheet material, which is bendable and has good flexibility.
[0022] Spectrophotometer method to measure polymer aerogel to heavy metal i...
example 2
[0024] Add attapulgite at a mass fraction of 10% relative to the solvent to N,N-dimethylacetamide, mechanically disperse for 60 minutes, then add polyvinyl chloride powder with a mass fraction of 15% relative to the solvent, at 100°C and at a speed of 400r / min After stirring for 3 hours, a polyvinyl chloride solution was obtained. After the polyvinyl chloride solution was left to stand at 40°C for 12 hours, a liquid film with a thickness of 1000 microns was scraped on the surface of the plate. After standing at 20°C for 60 seconds, the plate was immersed in a coagulation bath at room temperature In 20 minutes, the liquid film on the plate forms a gel, which is soaked in methanol for 2 days and then dried under normal pressure to obtain a specific surface area of 26m 2 / g, a bendable polyvinyl chloride aerogel with a thermal conductivity of 0.036W / (m·K). Spectrophotometer method to measure polymer aerogel to heavy metal ion Cu in 1g / L heavy metal salt solution 2+ 、Ni 2+ and...
example 3
[0026] Add whiskers with a mass fraction of 5% to N-methylpyrrolidone, mechanically disperse for 60 minutes, add polyurethane powder with a mass fraction of 10% relative to the solvent, and stir at 80°C for 5 hours at a speed of 200r / min to obtain a polyurethane solution, polyurethane After the solution was left to stand at 60°C for 2 hours, a liquid film with a thickness of 500 microns was scraped off the surface of the plate. After standing at 40°C for 30 seconds, the plate was immersed in a coagulation bath for 10 minutes at room temperature, and the liquid film on the plate formed a gel. The glue was soaked in water for 3 days and then freeze-dried to obtain a specific surface area of 80m 2 / g, a bendable polyurethane airgel with a thermal conductivity of 0.030W / (m·K). Spectrophotometer method to measure polymer aerogel to heavy metal ion Cu in 1g / L heavy metal salt solution 2+ 、Ni 2+ and Cr 3+ The adsorption amounts were 186, 101 and 64 mg / g, respectively.
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