Preparation method of MXene-carbon aerogel/TPU composite material

Abstract

The invention discloses a preparation method of an MXene-carbon aerogel / TPU composite material. The method specifically comprises the following steps: firstly, etching an MAX phase precursor by LiF / HCl to prepare a few-layer MXene solution; preparing an MXene-cellulose aerogel by using a few-layer MXene solution; then, putting the MXene-cellulose aerogel into a tubular furnace to be carbonized, and obtaining MXene-carbon aerogel; and finally, preparing a MXene-carbon aerogel / TPU composite material from the MXene-carbon aerogel and TPU particles. According to the composite material prepared by the method, the unique design of a three-dimensional structure enables electromagnetic waves to enter more easily, and incident waves are attenuated through multiple reflections and scattering in the porous structure, so that excellent electromagnetic shielding performance is obtained, and the application requirements in the fields of aerospace, electronic packaging and the like can be met.

Description

technical field

[0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a preparation method of MXene-carbon airgel / TPU composite material. Background technique

[0002] With the rapid development of 5G technology and the trend of miniaturization and miniaturization of electronic devices, the electromagnetic wave pollution brought at the same time has become a serious threat to human health and the inherent performance of components. Therefore, it is of great significance to design and prepare high-performance electromagnetic interference (EMI) shielding materials with high absorption mechanism dominance to solve this problem.

[0003] In order to reduce the secondary electromagnetic radiation pollution caused by the reflection of electromagnetic waves on the surface of materials, constructing a highly porous three-dimensional structure is a key strategy to alleviate the impedance mismatch between materials and air....

Examples

Embodiment 1

[0049] A kind of preparation method of MXene-carbon airgel / TPU composite material of the present invention, specifically implement according to the following steps:

[0050] Step 1, Etching Ti by LiF / HCl 3 AlC 2 (MAX phase) precursor to prepare few-layer MXene solution, the specific steps are as follows:

[0051] Step 1.1, fully mix 2gLiF with 40ml 9mol / L HCl, then slowly add 2gMAX phase precursor powder under ice bath conditions;

[0052] Step 1.2, the above mixture was stirred at 35°C for 24 hours to obtain Ti 3 C 2 T x The suspension was repeatedly washed with deionized water until the pH was 7, and centrifuged at a speed of 3500r / min;

[0053] Step 1.3, the Ti 3 C 2 T x Disperse the precipitate in 100ml deionized water, sonicate for 15min to promote the stratification of multi-layer MXene, then continue to centrifuge at a rate of 3500r / min for 15min, cycle several times, take the supernatant to obtain the MXene solution;

[0054] Step 2, preparing MXene-cellulose ...

Embodiment 2

[0065] A kind of preparation method of MXene-carbon airgel / TPU composite material of the present invention, specifically implement according to the following steps:

[0066] Step 1, Etching Ti by LiF / HCl 3 AlC 2 (MAX phase) precursor to prepare few-layer MXene solution, the specific steps are as follows:

[0067] Step 1.1, fully mix 2gLiF with 40ml 9mol / L HCl, then slowly add 2gMAX phase precursor powder under ice bath conditions;

[0068] Step 1.2, the above mixture was stirred at 35°C for 24 hours to obtain Ti 3 C 2 T x The suspension was repeatedly washed with deionized water and centrifuged at a rate of 3500r / min until the pH was 7;

[0069] Step 1.3, the Ti 3 C 2 T x Disperse the precipitate in 100ml deionized water, ultrasonicate for 15min to promote the stratification of multilayer MXene, then continue to centrifuge at a rate of 3500r / min for 15min, cycle several times, take the supernatant, and obtain the multilayer MXene solution;

[0070] Step 2, preparing M...

Embodiment 3

[0081] A kind of preparation method of MXene-carbon airgel / TPU composite material of the present invention, specifically implement according to the following steps:

[0082] Step 1, Etching Ti by LiF / HCl 3 AlC 2 (MAX phase) precursor to prepare few-layer MXene solution, the specific steps are as follows:

[0083] Step 1.1, fully mix 2gLiF with 40ml 9mol / L HCl, then slowly add 2gMAX phase precursor powder under ice bath conditions;

[0084] Step 1.2, the above mixture was stirred at 35°C for 24 hours to obtain Ti 3 C 2 T x The suspension was repeatedly washed with deionized water and centrifuged at a rate of 3500r / min until the pH was 7;

[0085] Step 1.3, the Ti 3 C 2 T x Disperse the precipitate in 100ml deionized water, ultrasonicate for 15min to promote the stratification of multilayer MXene, then continue to centrifuge at a rate of 3500r / min for 15min, cycle several times, take the supernatant, and obtain the multilayer MXene solution;

[0086] Step 2, preparing M...

technical field

[0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a preparation method of MXene-carbon airgel / TPU composite material. Background technique

[0002] With the rapid development of 5G technology and the trend of miniaturization and miniaturization of electronic devices, the electromagnetic wave pollution brought at the same time has become a serious threat to human health and the inherent performance of components. Therefore, it is of great significance to design and prepare high-performance electromagnetic interference (EMI) shielding materials with high absorption mechanism dominance to solve this problem.

[0003] In order to reduce the secondary electromagnetic radiation pollution caused by the reflection of electromagnetic waves on the surface of materials, constructing a highly porous three-dimensional structure is a key strategy to alleviate the impedance mismatch between materials and air....

Examples

Embodiment 1

[0049] A kind of preparation method of MXene-carbon airgel / TPU composite material of the present invention, specifically implement according to the following steps:

[0050] Step 1, Etching Ti by LiF / HCl 3 AlC 2 (MAX phase) precursor to prepare few-layer MXene solution, the specific steps are as follows:

[0051] Step 1.1, fully mix 2gLiF with 40ml 9mol / L HCl, then slowly add 2gMAX phase precursor powder under ice bath conditions;

[0052] Step 1.2, the above mixture was stirred at 35°C for 24 hours to obtain Ti 3 C 2 T x The suspension was repeatedly washed with deionized water until the pH was 7, and centrifuged at a speed of 3500r / min;

[0053] Step 1.3, the Ti 3 C 2 T x Disperse the precipitate in 100ml deionized water, sonicate for 15min to promote the stratification of multi-layer MXene, then continue to centrifuge at a rate of 3500r / min for 15min, cycle several times, take the supernatant to obtain the MXene solution;

[0054] Step 2, preparing MXene-cellulose ...

Embodiment 2

[0065] A kind of preparation method of MXene-carbon airgel / TPU composite material of the present invention, specifically implement according to the following steps:

[0066] Step 1, Etching Ti by LiF / HCl 3 AlC 2 (MAX phase) precursor to prepare few-layer MXene solution, the specific steps are as follows:

[0067] Step 1.1, fully mix 2gLiF with 40ml 9mol / L HCl, then slowly add 2gMAX phase precursor powder under ice bath conditions;

[0068] Step 1.2, the above mixture was stirred at 35°C for 24 hours to obtain Ti 3 C 2 T x The suspension was repeatedly washed with deionized water and centrifuged at a rate of 3500r / min until the pH was 7;

[0069] Step 1.3, the Ti 3 C 2 T x Disperse the precipitate in 100ml deionized water, ultrasonicate for 15min to promote the stratification of multilayer MXene, then continue to centrifuge at a rate of 3500r / min for 15min, cycle several times, take the supernatant, and obtain the multilayer MXene solution;

[0070] Step 2, preparing M...

Embodiment 3

[0081] A kind of preparation method of MXene-carbon airgel / TPU composite material of the present invention, specifically implement according to the following steps:

[0082] Step 1, Etching Ti by LiF / HCl 3 AlC 2 (MAX phase) precursor to prepare few-layer MXene solution, the specific steps are as follows:

[0083] Step 1.1, fully mix 2gLiF with 40ml 9mol / L HCl, then slowly add 2gMAX phase precursor powder under ice bath conditions;

[0084] Step 1.2, the above mixture was stirred at 35°C for 24 hours to obtain Ti 3 C 2 T x The suspension was repeatedly washed with deionized water and centrifuged at a rate of 3500r / min until the pH was 7;

[0085] Step 1.3, the Ti 3 C 2 T x Disperse the precipitate in 100ml deionized water, ultrasonicate for 15min to promote the stratification of multilayer MXene, then continue to centrifuge at a rate of 3500r / min for 15min, cycle several times, take the supernatant, and obtain the multilayer MXene solution;

[0086] Step 2, preparing M...

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