Method for preparing radar wave absorbing material using collagen fiber as template

A collagen fiber and absorbing material technology, which is applied in the field of preparation of radar wave absorbing materials, can solve the problems of increasing the weight of three-dimensional wave absorbing materials, reducing production efficiency, restricting applications, etc., so as to shorten the preparation cycle, reduce the preparation cost, and improve the production efficiency. Effect

Active Publication Date: 2017-08-08
SICHUAN UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the absorption performance of this artificially constructed carbonaceous absorbing material with a three-dimensional structure is significantly improved compared with traditional radar wave absorbing materials (one-dimensional and two-dimensional structures), but: 1) due to the preparation of this three-dimensional The structure of the radar wave absorbing material requires chemical assembly and physical and chemical methods, so a large amount of chemical additives will be used, which will not only increase the cost, but also cause pollution to the environment due to emissions
2) Since the carbonaceous raw material molecules used contain a large number of π electron clouds, the molecules are easy to accumulate and aggregate under the action of π-π bonds, and cannot effectively form a highly ordered three-dimensional structure. Therefore, in the preparation process, it is necessary Add surfactants to disperse it, which will further increase the cost and aggravate the pollution to the environment (Ren F, Yu H, Wang L, et al.Current Progress on the Modification of CarbonNanotubes and Their Application in Electromagnetic Wave Absorption[ J].RSC, Advances, 2014, 4, 14419.)
3) Since both CNTs and Graohene have high complex permittivity and diamagnetism, in order to meet the impedance matching principle of radar wave absorbing materials, a large amount (>50%) of magnetic nanoparticles must be compounded to improve Its magnetic permeability (Wang Z, Wu L, Zhou J, et al.Chemoselectivity-induced multiple interfaces in MWCNT / Fe3O4@ZnO heterotrimers for whole X-bandmicrowave absorption[J].Nanoscale,2014,6,12298-12302.), However, compounding a large number of magnetic nanoparticles will undoubtedly increase the weight of the three-dimensional absorbing material, thereby limiting its application in a wider range of fields.
4) To obtain a three-dimensional structure carbonaceous absorbing material containing active groups, it must first be prepared by chemical assembly and physical and chemical methods, which will undoubtedly prolong the preparation cycle, reduce production efficiency, and increase the preparation cost

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
  • Method for preparing radar wave absorbing material using collagen fiber as template
  • Method for preparing radar wave absorbing material using collagen fiber as template
  • Method for preparing radar wave absorbing material using collagen fiber as template

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 100 parts of collagen fibers with a length of 0.1 to 5.0 mm and 800 parts of deionized water into the reaction device, stir and mix evenly, adjust the pH of the system to 2.0, and then add 60 parts of Fe 3+ Precursor solution (prepared solution with ferric sulfate, the concentration is 0.05mol / L), reacted for 4h, then slowly added NaHCO 3 Solution, the pH of the system was adjusted to 4.0 in 4 hours, and the temperature was raised to 40°C to continue the reaction for 6 hours. After the reaction was completed, it was filtered, washed, and dried to obtain Fe loaded with metal ions. 3+ Collagen fibers (Fe 3+ -CF).

[0035] Under nitrogen protection, the Fe 3+ -CF was carbonized at a heating rate of 5 °C / min, followed by the following heating program: heating from room temperature to 300 °C and maintaining for 2 h, then raising the temperature to 500 °C and maintaining for 2 h, after the temperature was naturally cooled to room temperature, that is Fe with three-dime...

Embodiment 2

[0037] Add 100 parts of collagen fibers with a length of 0.1 to 5.0 mm and 400 parts of deionized water into the reaction device, stir and mix evenly, adjust the pH of the system to 1.5, and then add 40 parts of Fe 3+ Precursor solution (prepared solution with ferric nitrate, concentration is 0.05mol / L), reacted for 6h, then slowly added Na 2 CO 3 Solution, the pH of the system was adjusted to 5.0 in 0.5h, and the temperature was raised to 50°C to continue the reaction for 4h. After the reaction was completed, it was filtered, washed, and dried to obtain Fe loaded with metal ions. 3+ Collagen fibers (Fe 3+ -CF).

[0038] Under nitrogen protection, the Fe 3+ -CF was carbonized at a heating rate of 1°C / min, followed by the following heating program: heating from room temperature to 300°C for 3 hours, then raising the temperature to 600°C and holding for 4 hours, and then cooling down to room temperature naturally. Obtain Fe with three-dimensional structure 3 N-carbon compos...

Embodiment 3

[0040] Add 100 parts of collagen fibers with a length of 0.1 to 5.0mm and 1200 parts of deionized water into the reaction device, stir and mix evenly, adjust the pH of the system to 2.5, and then add 80 parts of Fe 3+ Precursor solution (prepared solution with ferric chloride, the concentration is 0.05mol / L), react for 8 hours, then slowly add ammonia solution dropwise, adjust the pH of the system to 3.5 in 2 hours, and raise the temperature to 30°C to continue the reaction for 10 hours, the reaction is over After filtration, washing, and drying, the metal ion-loaded Fe 3+ Collagen fibers (Fe 3+ -CF).

[0041] Under nitrogen protection, the Fe 3+ -CF was carbonized at a heating rate of 3°C / min, followed by the following heating program: heating from room temperature to 100°C and keeping it for 1 hour, continuing to raise the temperature to 300°C and keeping it for 3 hours, then raising the temperature to 700°C and keeping it for 6 hours. After the temperature is naturally c...

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

PropertyMeasurementUnit
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for manufacturing a radar wave absorption material with a three-dimensional structure with collagen fibers as a template. The method is characterized by comprising the following steps: acidifying and debonding collagen fibers, coordinating and loading the collagen fibers with a certain quantity of metal ions on a three-dimensional collagen fiber network, and gradually heating the collagen fibers loaded with the metal ions at a certain heating rate for high-temperature carbonization, thereby obtaining a metal oxide-carbon composite nano-fiber radar wave absorption material with a highly ordered three-dimensional structure. The method has the characteristics of simple and mature process, easiness in operation and control, short manufacture period, high production efficiency and low manufacture cost, and can avoid many problems caused by use of carbon materials in the prior art. Meanwhile, as the radar wave absorption material is compounded with few magnetic nano-particles, the weight of the material is lowered, and the material is endowed with excellent wave absorption performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of radar wave absorbing materials, and in particular relates to a method for preparing radar wave absorbing materials with a three-dimensional structure by utilizing the unique three-dimensional structure and chemical reaction characteristics of collagen fibers. Background technique [0002] With the rapid development of electronic information technology, the problem of electromagnetic pollution is becoming more and more serious. The most effective measure to control electromagnetic radiation pollution is to shield and absorb radar waves and suppress the intensity of electromagnetic radiation within a safe range. At present, in order to meet the special requirements of various applications, it is urgent to develop new wave-absorbing materials with "thin thickness, light weight, wide frequency, and strong absorption" (Peng Zhihui, Cao Maosheng, Yuan Jie, etc. Radar absorbing materials Research...

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 & AuthorityPatents(China)
IPC IPC(8): D01F9/18D01F1/10
Inventor廖学品王晓玲石碧黄鑫
OwnerSICHUAN UNIV