Efficient preparation method and application of aerogel material

An airgel, high-efficiency technology, applied in applications, chemical instruments and methods, household appliances, etc., can solve the problem of affecting the modification effect and use efficiency of surface modifiers in the later stage, affecting the quality of airgel and direct production costs, and environmental governance High cost and other problems, to achieve the effect of high efficiency and rapid ethanol removal efficiency, low environmental treatment cost, simple and effective process

Pending Publication Date: 2021-12-21
响水华夏特材科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether the solvent replacement is thorough will affect the modification effect and use efficiency of the surface modifier in the later stage, and affect the quality of the airgel and the direct production cost.
Simultaneously, the invention patent of CN200910073009.4, CN201010205734.5 as the disclosed patent application number in the prior art has reported gel solvent replacement process, needs to carry out multiple replacement and Washing produces a large amount of waste solvents and waste water, while the efficiency is low, the recycling cost is high, the environment is polluted, and the cost of environmental treatment is high

Method used

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  • Efficient preparation method and application of aerogel material
  • Efficient preparation method and application of aerogel material
  • Efficient preparation method and application of aerogel material

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preparation example Construction

[0071] The efficient preparation method of the airgel material of the present invention, the preparation process is as follows figure 1 As shown, it specifically includes the following steps:

[0072] (1) Silica sol preparation: mix ethyl orthosilicate, methyltriethoxysilane, ethanol and entrainer mixture, and water according to the volume ratio of 1:0.1-0.5:5-25:0.1-0.3, adjust The pH is 4-5, after stirring for more than 2 hours, a silica sol is obtained.

[0073] (2) Preparation of silica gel: Dilute the silica sol described in step (1) to the target concentration with the mixture of ethanol and entrainer, adjust the pH to 7.5-8.5, stir quickly and evenly, and after standing still, the gel can be obtained . The gel composite is obtained by impregnating the fiber preform before gelling.

[0074] (3) Azeotropic distillation replacement: transfer the gel or gel composite material described in step (2) to a still, add an azeotropic agent to soak and heat to distill.

[0075]...

specific Embodiment 1

[0085] A method for preparing an airgel material. Mix 100mL tetraethyl orthosilicate, 30mL methyltriethoxysilane, 500mL ethanol, and 20mL water, adjust the pH to 4.5 with dilute hydrochloric acid, and stir for 2 hours to obtain a silica sol. Dilute the silica sol in equal volumes with a mixture of ethanol and an entrainer. The specific volume ratio of ethanol and entrainer is 1:0.1. Adjust the pH to 8.0 with dilute ammonia water. Stir quickly and evenly. After standing still, a gel can be obtained. Then the gel is simply crushed, transferred to a still, and hexamethyldisiloxane is added to submerge the gel particles, and the temperature of the heating medium is kept at 80°C for distillation, during which the hexamethyldisiloxane is continuously refluxed to maintain the liquid level Above the particles, until no 68-73°C distillate flows out, the replacement is completed. Then, add hexamethyldisilazane, a modifying agent with 5% volume of the gel material, into the distillation ...

Embodiment 2

[0088] A method for preparing an airgel material is similar to Example 1, except that trimethylchlorosilane is selected as the surface modifier. The obtained airgel is measured by Micromeritics Tristar 3020. The specific surface area of ​​the airgel material is 692.5345 m² / g, the average BJH pore diameter is 11.2422 nm, and the particle density is 0.1530g / cm 3 .

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Abstract

The invention provides an efficient preparation method and application of an aerogel material. The method mainly comprises the following steps: S1, preparing silica sol; S2, preparing silica gel; S3, carrying out azeotropic distillation; S4, modifying the surface of the gel material; and S5, drying at normal pressure to obtain the aerogel material or the aerogel composite material disclosed by the invention. The azeotropic distillation replacement process is adopted, the ethanol removal efficiency is higher and quicker, hexamethyldisiloxane or n-heptane and the surface modifier are compatible and do not react in the gel surface modification stage, the utilization rate and the modification effect of the surface modifier are further improved, the raw material cost of aerogel production is reduced, the replacement period of a production solvent is shortened, and the productivity is improved. The method does not need to adopt a solution with gradient concentration for replacement and washing for many times, solvent recycling is simple and high in efficiency, the environment treatment cost is low, and the process is simple and effective.

Description

technical field [0001] The invention belongs to the field of preparation of nanoporous materials, in particular to an efficient preparation method and application of airgel materials. Background technique [0002] Airgel is obtained when the liquid in the pores of the wet gel is replaced by gas without the structure collapsing. The supercritical method utilizes the characteristics of supercritical fluids such as no surface tension, high diffusivity, and high solubility to effectively avoid the collapse of the gel skeleton during the drying process, and at the same time realize the separation of the solvent and the gel skeleton, and can prepare airgel products with excellent performance , is the most commonly used standard method for preparing high-quality aerogels. However, the supercritical method involves high-temperature and high-pressure use of special equipment such as high-pressure containers and dangerous chemicals. At the same time, materials need to be transferred ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/157C01B33/158C01B33/155C04B30/02C04B38/00C04B14/06
CPCC01B33/157C01B33/158C01B33/155C04B30/02C04B14/064C01P2006/12C01P2006/16C01P2006/10C04B2201/20C04B2201/32C04B20/0048C04B38/0045C04B38/0067
Inventor 陈勇段国栋陈世忠王恒谢江徐兴艳王浩浩
Owner 响水华夏特材科技发展有限公司
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