A kind of polymethacrylimide airgel and preparation method thereof

A technology of polymethacrylimide and methacrylic acid, which is applied in the field of polymethacrylimide airgel and its preparation, can solve the problems of poor mechanical properties and achieve high mechanical properties, good mechanical properties and The effect of heat resistance

Active Publication Date: 2022-03-18
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic aerogels, such as silica aerogels and carbon aerogels, have excellent thermal insulation properties but extremely poor mechanical properties

Method used

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  • A kind of polymethacrylimide airgel and preparation method thereof
  • A kind of polymethacrylimide airgel and preparation method thereof
  • A kind of polymethacrylimide airgel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0042] The difference from Example 1 is that Step 1: Mix 6 g of MAN, 9 g of MAA, 0.1 g of AM, 35 g of DMSO and 0.015 g of AIBN evenly. Under the condition of a constant temperature water bath at 60° C., the radical solution polymerization reaction was carried out for 96 hours to obtain a PMI prepolymer solution.

[0043] Step 2: Preparation of quaternary ammonium salt

[0044] Add 21.15 g of triethylamine to the PMI prepolymer solution in Step 1, stir vigorously until the solution is uniform, and then let it stand for 24 hours to react. After the reaction is completed, it becomes a PMI prepolymer quaternary ammonium salt solution.

[0045] When the obtained PMI prepolymer quaternary ammonium salt prepares an airgel with a solid content of 6 wt%, the airgel density is 0.1023g / cm, the compression modulus is 50.4MPa, and the thermal conductivity is 0.0620W / (m·K).

Embodiment 3

[0047]The difference from Example 1 is that Step 1: Mix 9 g of MAN, 6 g of MAA, 0.45 g of AM, 35 g of DMSO and 0.45 g of AIBN evenly. Under the condition of a constant temperature water bath at 60° C., the radical solution polymerization reaction was carried out for 96 hours to obtain a PMI prepolymer solution.

[0048] Step 2: Preparation of quaternary ammonium salt

[0049] Add 14.1 g of triethylamine to the PMI prepolymer solution in step 1, and keep stirring until the solution is uniform, and react for 24 hours. After the reaction is completed, it becomes a solution of uniform PMI prepolymer quaternary ammonium salt.

[0050] When the obtained quaternary ammonium salt is used to prepare an airgel with a solid content of 6 wt%, the obtained airgel has a density of 0.0923g / cm, a compressive modulus of 68.4MPa, and a thermal conductivity of 0.0617W / (m·K).

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Abstract

The invention relates to a polymethacrylimide airgel and a preparation method thereof, belonging to the technical field of airgel preparation. Use methacrylic acid and methacrylonitrile monomers to prepare a solution of polymethacrylimide prepolymer; the obtained PMI prepolymer solution is made into PMI prepolymer quaternary ammonium salt; after repeated washing, it turns white Agglomerated solids, followed by drying; redissolving in aqueous solution, freezing and solidifying; freeze-drying, and then obtaining PMI prepolymer quaternary ammonium salt airgel; after heat treatment, obtaining polymethacrylimide airgel. Polymethacrylimide airgel has a three-dimensional network-like open-pore structure, which expands the scope of polymethacrylimide porous materials, and also expands the application of polymethacrylimide porous materials in sound absorption, catalysis, adsorption, etc. field applications. Polymethacrylimide airgel has better mechanical properties and heat resistance. While ensuring sufficient heat resistance, it has high mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of airgel preparation, in particular to a polymethacrylimide airgel and a preparation method thereof Background technique [0002] The molecular structure of polymethacrylimide (PMI) material endows it with excellent mechanical properties and heat resistance: carboxyl and nitrile groups form hydrogen bonds between molecular chains; methyl, carboxyl and nitrile steric positions The resistance makes the molecular chain rigid; the six-membered imide ring further increases the rigidity of the molecular chain; in addition, cross-linking occurs between the molecular chains to form a spatial network structure. Therefore, polymethacrylimide is a material with very excellent mechanical properties. [0003] At present, polymethacrylimide products in the market are all in the form of foam. Polymethacrylimide foam material is a typical thermosetting foam with excellent comprehensive performance. Its natural color is be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08F220/50C08F220/06C08F220/56C08F8/32C08F8/48C08L33/22C08L33/02
CPCC08J9/28C08F220/50C08F220/06C08F8/48C08J2201/0484C08J2205/026C08J2333/22C08J2333/02C08J2205/05C08F220/56C08F8/32
Inventor 张竞张宏礼吴义民汤继俊
Owner JIANGSU UNIV OF SCI & TECH
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