A light, flexible superhydrophobic porous gas gel material and its preparation method

A gas gel and super-hydrophobic technology, applied in chemical instruments and methods, colloid chemistry, colloid chemistry, etc., can solve problems such as environmental pollution, unstable channels, increased density, etc., and achieve high softness, easy bending, The effect of high-efficiency hydrophobicity

Active Publication Date: 2016-04-20
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Drying at normal temperature and pressure is favored by people because of its simple method, but in the process of drying at normal temperature and pressure, the pores are not stable enough, causing the density to increase (A.S.Dorcheh, M.Abbasi, J.Mater.Process.Technol.2008 , 199, 10.)
In addition, using acetic acid as an acidic medium is likely to cause environmental pollution.
How to use a solvent that can maintain the stability of the pores and be environmentally friendly under normal temperature and pressure drying conditions is still blank.

Method used

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  • A light, flexible superhydrophobic porous gas gel material and its preparation method
  • A light, flexible superhydrophobic porous gas gel material and its preparation method
  • A light, flexible superhydrophobic porous gas gel material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Step 1: Take 3.0g (0.05mol) of urea and 0.4g of cetyltrimethylammonium bromide (0.0011mol), add it to 7ml of 4mM butyl carboxylate ionic liquid (Ⅰ, where R=C 4 h 7 , denoted as ILC 4 ), mix well.

[0044] Step 2: Add 0.0105 mol methyltrimethoxysilane (MTMS) and 0.007 mol methyldimethoxysilane (DMDMS) to the mixed solution in the first step while stirring mechanically, and stir continuously for 30 minutes until the hydrolysis is complete.

[0045] The third step: transfer the mixed solution in the second step to a reaction kettle, and gel and age in an oven at 80° C. for 7 hours.

[0046] Step 4: Repeatedly washing with double distilled water and ethanol by manual immersion-extrusion, and drying at normal temperature and pressure to obtain a porous gas gel material. Recorded as: ILC 4 -MTMS-DMDMS.

[0047] Be the digital photo of the product gas gel material of this embodiment under fluorescent lamp as figure 1 shown. The size of the material obtained therein is 2...

Embodiment 2

[0051] Vinyltrimethoxysilane (VTMS) was used to replace methyltrimethoxysilane (MTMS) in Example 1, and other steps were the same as Example 1. Gained airgel material is denoted as: ILC 4 -VTMS-DMDMS. The gas gel material obtained after drying is respectively immersed in water and ethanol at normal temperature and pressure for secondary drying.

[0052] The size comparison digital photos of the product gas gel material of this embodiment before and after secondary drying under the fluorescent lamp are as follows: image 3 shown. The size of the material remains stable before and after secondary drying, indicating that the size of the airgel material is not affected by solution modification.

[0053] The scanning electron microscope picture of the product gas gel material of this embodiment is as follows Figure 4 shown. 4a is the scanning electron microscope picture of the preliminarily prepared air gel material; 4b is the scanning electron microscope picture of the second...

Embodiment 3

[0056] Methyltrimethoxysilane (MTMS) in Example 1 was replaced with methyltrimethoxysilane (MTMS) and trithiopropyltrimethoxysilane (MPTMS). Specific steps are as follows:

[0057] 1. Take urea 3.0 (0.05mol) g, cetyltrimethylammonium bromide (CTAB) 0.4g (0.0011mol), add to 7ml concentration is 4mML -1 Butyl carboxylic acid ionic liquid (ILC 4 ), mix well.

[0058] 2. While mechanically stirring the mixed solution in 1, add methyltrimethoxysilane (MTMS) and trimethoxypropyltrimethoxysilane (MPTMS, 0.00525mol) at a molar ratio of 1:1, and stir continuously for 30min until Hydrolysis is complete. Other steps are with embodiment 1. Gained airgel material is denoted as: ILC 4 -MTMS / MPTMS-DMDMS.

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Abstract

The invention relates to a light and flexible super-hydrophobic porous gas gel material. The material is prepared through the following steps of step 1, adding urea, a carboxylic ion liquid solution and a surface active agent into a reactor and mixing; step 2, adding siloxane during the stirring; step 3, transferring to a reaction kettle, and polymerizing and aging in a drying oven for 5h to 8h at the temperature of 70 to 90 DEG C; and step 4, washing by double distilled water and ethanol in sequence, and drying at normal pressure and temperature to obtain the light and flexible super-hydrophobic porous gas gel material. The material has the characteristics that the density is small, the porosity is large, easiness in bending is realized, resilience is available after being compressed, the super-hydrophobility is realized, the material can be applied in the temperature range of 77K to 573K, the pore is stable and can stand the modification of the solution, and the like.

Description

technical field [0001] The technical solution of the present invention relates to the preparation of porous gas gel, specifically a light, flexible super-hydrophobic porous gas gel material and a preparation method thereof. Background technique [0002] Aerogel is a kind of highly dispersed porous solid material. Its porous solid structure is composed of colloidal particles or polymer molecules, and the pores are filled with gaseous dispersion medium. between nanometers. Aerogels have the advantages of low thermal conductivity, low density, high porosity, large specific surface area, and controllable structure and doping, making them widely used as adsorbents, gas storage, catalyst supports, filters, membranes, and separation media. Typical silica aerogels, usually prepared by sol-gel process, have high porosity (>90%) and small pore size (~50 nm), and the porous structure consists of aggregates of silica nanoparticles (~ 10nm) composition. However, the highly fragile ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00
Inventor 李焕荣秦智乔王金
Owner HEBEI UNIV OF TECH
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