Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of broadband adjustable wave-absorbing hydrogel

A hydrogel and broadband technology is applied in the field of preparation of broadband tunable wave-absorbing hydrogels, which can solve the problems of difficult to achieve broadband and efficient absorption of electromagnetic waves, water loss, poor impedance matching between water and air, and achieve good environmental friendliness. The effect of improving the performance, comprehensive performance, and excellent absorbing performance

Active Publication Date: 2021-10-22
ZHEJIANG SCI-TECH UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the poor impedance matching between water and air, most of the electromagnetic waves will be reflected by the water, and it is difficult for a single hydrogel material to achieve broadband and efficient absorption of electromagnetic waves. At the same time, when the climate changes, the water in the hydrogel There is also a risk of losing

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of broadband adjustable wave-absorbing hydrogel
  • Preparation method of broadband adjustable wave-absorbing hydrogel
  • Preparation method of broadband adjustable wave-absorbing hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Self-assembled Ti 3 C 2 T x Preparation of MXene conductive filler

[0032] (1) Preparation of few-layer Ti 3 C 2 T x MXene powder:

[0033] Add 1.6g of lithium fluoride and 20ml of 75% dilute hydrochloric acid solution into the polytetrafluoroethylene reactor, stir magnetically for 10min; slowly add 1g of MAX Ti 3 AlC 2 , react in a water bath at 35°C for 24 hours; wash with deionized water until the pH is 7, disperse ultrasonically, and centrifuge to obtain the upper suspension to obtain an MXene dispersion. The dispersion was freeze-dried to obtain few-layer Ti 3 C 2 T x MXene powder.

[0034] (2) Preparation of polypyrrole nanowire (PPyNWs-Cl) powder doped with chloride ions:

[0035] Take 125ml of 0.2M dilute hydrochloric acid, add 0.91g of cetyltrimethylammonium bromide and 0.2g of pyrrole, stir at 1°C for 2h; add 10ml of 0.3mol / ml ammonium persulfate solution dropwise, and continuously stir and polymerize for 24h; The black solid precipitate wa...

Embodiment 2

[0046] 1. Self-assembled Ti 3 C 2 T x Preparation of MXene conductive filler

[0047] (1) Preparation of few-layer Ti 3 C 2 T x MXene powder;

[0048] Detailed preparation process and parameter are with embodiment 1

[0049] (2) Preparation of polypyrrole nanowire (PPyNWs-Cl) powder doped with chloride ions;

[0050] Detailed preparation process and parameter are with embodiment 1

[0051] (3) the few layers of Ti 3 C 2 T x MXene powder and PPyNWs-Cl powder were added into 100mL water at a mass ratio of 1:2, ultrasonically dispersed for 30min, and magnetically stirred for 30min. Dry in a vacuum oven at 40°C for 12 hours to obtain self-assembled Ti 3 C 2 T x MXene powder.

[0052] 2. Preparation of composite hydrogel

[0053] (1) Water and glycerol are mixed according to the volume ratio of 3:7 to obtain 10 mL of liquid phase;

[0054] (2) Weigh 107mg of self-assembled Ti 3 C 2 T x MXene powder was added to the liquid phase, ultrasonically dispersed for...

Embodiment 3

[0061] 1. Self-assembled Ti 3 C 2 T x Preparation of MXene conductive filler

[0062] (1) Preparation of few-layer Ti 3 C 2 T x MXene powder;

[0063] Detailed preparation process and parameter are with embodiment 1

[0064] (2) Preparation of polypyrrole nanowire (PPyNWs-Cl) powder doped with chloride ions;

[0065] Detailed preparation process and parameter are with embodiment 1

[0066] (3) the few layers of Ti 3 C 2 T x MXene powder and PPyNWs-Cl powder were added into 100mL water at a mass ratio of 1:2, ultrasonically dispersed for 30min, and magnetically stirred for 30min. Dry in a vacuum oven at 40°C for 12 hours to obtain self-assembled Ti 3 C 2 T x MXene powder.

[0067] 2. Preparation of composite hydrogel

[0068] (1) Water and glycerol are mixed according to the volume ratio of 4:6 to obtain 10 mL of liquid phase;

[0069] (2) Weigh 107mg of self-assembled Ti 3 C 2 T x MXene powder was added to the liquid phase, ultrasonically dispersed for...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a broadband adjustable wave-absorbing hydrogel and a preparation method thereof. According to the invention, self-assembly type Ti < 3 > C < 2 > T < x > MXene is compounded with polyacrylamide hydrogel, so that the broadband adjustable electromagnetic wave absorption hydrogel is prepared. Through compounding of a polyacrylamide hydrogel network and self-assembly type Ti < 3 > C < 2 > T < x > MXene, the electromagnetic wave absorption intensity and bandwidth of the composite hydrogel material are enhanced; in addition, the water content of the hydrogel is controlled by adjusting the ratio of water to glycerol in a liquid phase, so that the electromagnetic wave absorption frequency band and the absorption strength of the composite hydrogel are changed. The wave absorption hydrogel disclosed by the invention is high in wave-absorbing strength, wide in wave-absorbing bandwidth, good in wave-absorbing effect and simple in preparation process, and can be used for industrial production.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular relates to a preparation method of a broadband adjustable wave-absorbing hydrogel. Background technique [0002] As we all know, electromagnetic wave absorbing materials have huge application requirements in the field of military stealth technology and civilian electromagnetic wave prevention and control. Especially with the rapid development of communication technology, the expectations for new wave-absorbing materials that can meet the needs of different occasions are getting higher and higher. [0003] Water-based absorbing materials stand out among the new wave-absorbing materials by utilizing the high dielectric constant of water and the strong loss characteristics of electromagnetic waves. However, there are problems such as easy loss of water, not wide absorbing frequency band, and unsatisfactory absorbing effect. [0004] Hydrogel is a water-swellable functional pol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L33/26C08L79/04C08K3/14C08G73/06C08F220/56C08F222/38C08F2/44C09D133/26C09D5/32
CPCC08J3/075C08G73/0611C08F220/56C08F2/44C09D133/26C09D5/32C08J2333/26C08J2479/04C08K3/14C08K2201/001C08F222/385C08L79/04
Inventor 刘宇傅雅琴齐晓明钱晨
Owner ZHEJIANG SCI-TECH UNIV