Degradable high-hydrophobicity aerogel porous material and preparation method thereof

Abstract

The invention relates to a degradable high-hydrophobicity aerogel porous material and a preparation method thereof, and belongs to the technical field of aerogel porous materials. The invention provides the preparation method of the degradable high-hydrophobicity aerogel porous material. The preparation method comprises the following steps: 1) stirring L-polylactic acid, D-polylactic acid and a pore-foaming agent in a solvent to completely dissolve the L-polylactic acid, the D-polylactic acid and the pore-foaming agent to obtain a transparent and uniform composite polylactic acid solution; (2) freezing the composite polylactic acid solution at the temperature of -100 DEG C to -10 DEG C for 12-48 hours; and (3) freeze-drying the completely frozen sample to obtain the degradable high-hydrophobicity aerogel porous material. The invention provides the novel preparation method of the degradable high-hydrophobicity aerogel porous material, the preparation method is simple and easy to operate, and the obtained porous material has a three-dimensional porous structure, has high porosity, low density and large specific surface area, and has good hydrophobicity and lipophilicity.

Description

technical field [0001] The invention relates to a degradable highly hydrophobic airgel porous material and a preparation method thereof, belonging to the technical field of airgel porous materials. Background technique [0002] At present, the leakage of oil and organic compounds has polluted the water quality, which not only has a serious negative impact on the ecological environment, but also has an impact on economic development that cannot be ignored. Facing these problems, absorbents for petroleum and organic compounds with special (super)hydrophobicity have attracted the attention of academia and industry, such as metal mesh, sponge / foam, aerogel, etc. However, the current research work mainly has the following three problems. First, the complicated and costly preparation of these materials hinders mass production. Second, many of these materials are non-degradable materials, which brings great trouble to the subsequent processing problems and causes secondary pollut...

AI Technical Summary

Problems solved by technology

First, the preparation process of these materials is complicated and at the same time requires high cost, which poses an obstacle to large-scale production

Second, many of these materials are non-degradable materials, which will bring great trouble to the subsequent processing problems and cause secondary pollution to the environment

Third, the raw materials of these materials are non-renewable energy sources, and their production will further consume energy

[0004] Zeolite, etc., but these traditional absorbent materials are generally incompatible with the environment when dealing with frequent oil spills.

[0005] Poor absorption capacity, poor recycling capacity, etc.

[0006] In order to solve these problems, some degradable porous membranes are also proposed in the prior art. For example, the patent application with application number 2018107245012 discloses a biodegradable oil-water separation porous membrane The preparation method of the film is to use tetraethyl orthosilicate and methanol solution as raw materials, adopt the sol-gel method to prepare silica gel, then carry out hydrophobic modification to it, and supercritically dry to obtain silica airgel; The airgel is added to the ethanol solution to prepare the silica airgel / ethanol dispersion, which is ready for use; then the polylactic acid film is prepared by non-solvent induced phase separation method, and the pretreated polylactic acid is dissolved in the solvent, and the temperature is constant Stir to obtain the casting film, pour the casting film on the surface of a clean glass plate, scrape the film with a scraper of a certain thickness, immerse the preformed polylactic acid film in the ethanol dispersion containing silica airgel, and cure and dry Obtain silica airgel@polylactic acid film; but its preparation process is too cumbersome

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