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Preparation method of aerogel composite material

A composite material and aerogel technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of unsatisfactory drying process, long production cycle, complicated process, etc., and achieve thorough drying effect and short production cycle The effect of short and short process flow

Active Publication Date: 2020-04-14
徐州绿肯环保科技有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the sol-gel method of the existing technology has a relatively complicated process, and requires extremely high costs and a long production cycle, which leads to the preparation of silica airgel composite materials, regardless of the selection of raw materials and the utilization of by-products, or the drying of products. The process aspects are still unsatisfactory, therefore, it is necessary to develop a new method to prepare silica airgel composites with better physical properties through a simpler process

Method used

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  • Preparation method of aerogel composite material

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preparation example Construction

[0030] Such as figure 1 A kind of preparation method of shown airgel composite material, comprises the following steps:

[0031] (1) Prepare a mixed solution with alkoxysilane, alkoxy alcohol, deionized water and modifier to obtain silica sol;

[0032] (2) Prepare silica wet gel containing substrate with silica sol as raw material;

[0033](3) aging silica wet gel containing substrate;

[0034] (4) dry silica wet gel containing substrate;

[0035] (5) reclaim alkoxy alcohol.

[0036] Wherein, in step (1), alkoxysilane, alkoxy alcohol, deionized water and modifier are mixed according to the molar ratio of 1: (2-40): (4-25): (0.1-10) Prepare a mixed solution, preferably, alkoxysilane, alkoxy alcohol, deionized water and modifier are prepared as a mixed solution according to the molar ratio of 1:(6~18):(4~12):(0.5~9) solution; gradually add an acidic catalyst to the above mixed solution, adjust the pH value to 2.5-5.5, preferably adjust the pH value to 3-4.5, adjust the temp...

Embodiment 1

[0051] Mix triethoxysilane, methanol, deionized water and hexamethyldisilazane according to a specific molar ratio to prepare a solution, the content of triethoxysilane, methanol, deionized water and hexamethyldisilazane The molar ratio is 1:2:25:0.1, stir for 15 minutes to mix evenly, keep stirring, then add the acidic catalyst phosphoric acid drop by drop, adjust the pH to 3.5, adjust the temperature to 40°C, and keep stirring for 50 minutes to make triethoxy Silane is fully hydrolyzed to obtain silica sol, and then kept at a constant temperature of 30°C for 120 minutes. According to the ratio of 1-50g of flame retardant aluminum hydroxide and 1-50g of infrared blocker iron oxide per liter of silica sol, the flame retardant 1. Add the infrared blocking agent to the silica sol after standing, stir rapidly for 1-10min, and disperse evenly to obtain a doped modified silica sol. While stirring, add an appropriate amount of basic catalyst NaF drop by drop to adjust The pH value o...

Embodiment 2

[0054] Mix tetraethoxysilane, ethanol, deionized water and trimethylsilanol according to a specific molar ratio to prepare a solution, the molar ratio of tetraethoxysilane, ethanol, deionized water and trimethylsilanol is 1 : 40: 6: 0.5, stir for 20 minutes to mix evenly, keep stirring, then add acidic catalyst hydrochloric acid drop by drop, adjust the pH value to 4, adjust the temperature to 50°C, and continue stirring for 60 minutes to fully hydrolyze tetraethoxysilane to obtain Silica sol, then keep the temperature at 40°C, let it stand for 100min, then add an appropriate amount of alkaline catalyst ammonia water drop by drop while stirring, adjust the pH value of the silica sol to 7, and then quickly soak the ceramic fiber felt in the sol to make the sol fully Infiltrate into the ceramic fiber mat, and then stand at a constant temperature of 30°C for 60 minutes, so that the silica sol and the ceramic fiber mat are combined and gelled to form a silica wet gel containing the...

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Abstract

The invention discloses a preparation method of an aerogel composite material, and the method comprises the following steps: hydrolyzing alkoxy silane serving as a raw material to form sol, and addinga flame retardant, an infrared blocking agent and a base material into the silica sol to prepare silicon dioxide wet gel containing the base material; preparing silicon dioxide aerogel, aging, carrying out supercritical drying and normal-pressure drying to obtain the silicon dioxide aerogel composite material, and recovering hydrolysis byproduct alkoxy alcohol for recycling to prepare the alkoxysilane. By adopting the technical scheme, the preparation method is simple, the overall reaction is stable, the controllability is strong, the investment cost is low, the production period is short, and the process technology can realize continuous production and is environment-friendly; the prepared silicon dioxide aerogel composite material is excellent in heat insulation performance and heat resistance, and has relatively high processability.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanometer materials, and in particular relates to a preparation method of an airgel composite material. Background technique [0002] Silica airgel is a typical three-dimensional nanoporous material, composed of more than 95% air and less than 5% Si skeleton, with an average pore size of 20-50nm and a very high specific surface area of ​​500-1200m 2 / g, very low density 0.003~0.10g / cm 3 And extremely low thermal conductivity 0.011 ~ 0.021W / m·K (at room temperature). High-purity silica airgel is widely used in the preparation of Cherenkov detectors, special optical equipment, supercapacitors, sound-absorbing and sound-absorbing materials, and drug carriers. However, due to its poor mechanical properties and the presence of -OH groups on the surface are hydrophilic When used in the thermal insulation market, silica airgel powder and particles need to be made, and then mixed with p...

Claims

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Application Information

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IPC IPC(8): C01B33/158C01B33/155
CPCC01B33/1585C01B33/155C01P2006/32
Inventor 佟峰刘兴华张建立
Owner 徐州绿肯环保科技有限公司