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A method for preparing a field reversible nonlinear conductive composite material, the material prepared by the method and application of the material

A conductive composite material, nonlinear technology, applied to conductive materials dispersed in non-conductive inorganic materials, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem of unstable nonlinear conductivity, electromagnetic pulse Poor protection performance, diode delay time and other problems, to achieve the effect of easy mass production, excellent mechanical properties, and no agglomeration

Active Publication Date: 2019-08-06
ARMY ENG UNIV OF PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liu Peiguo, National University of Defense Technology, etc. used diodes to prepare electromagnetic energy selective surfaces with different structures, but there is a delay time in the conduction of the diodes, and the protection performance against electromagnetic pulses is poor.
The research group prepared a polymer-based composite material filled with pure conductive particles in the early stage. The conductivity test found that the filled composite material has significant nonlinear conductive characteristics under a strong electric field, but because the pure conductive particles are easy to form percolation in the matrix. The network makes the nonlinear conductive characteristics of such materials unstable, and the resistivity is still large after conduction

Method used

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  • A method for preparing a field reversible nonlinear conductive composite material, the material prepared by the method and application of the material
  • A method for preparing a field reversible nonlinear conductive composite material, the material prepared by the method and application of the material
  • A method for preparing a field reversible nonlinear conductive composite material, the material prepared by the method and application of the material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation method of the field-induced reversible nonlinear conductive composite material comprises the following steps:

[0043] (1) First, weigh 0.8 g of PVP and add it to 100 ml of EG and stir for 4 to 5 hours until it is completely dissolved to obtain a mixed solution A.

[0044] (2) After that, weigh 1g of AgNO 3 And add to solution A and stir well for about 1 hour until completely dissolved to obtain solution B.

[0045] (3) Then, add 14ml of 600μM FeCl to Solution B 3 / EG solution and stirred for about 5 minutes to obtain solution C.

[0046] (4) Pour the uniformly stirred solution C into a 500ml round-bottomed flask and heat in an oil bath at 130°C for 5 hours. Solution C in the round-bottomed flask gradually darkened from light yellow to brown, and finally turned milky white, forming milky white suspension D. After the reaction is complete, wait for the milky white suspension D to cool down to room temperature naturally, take it out and pour it into a ...

Embodiment 2

[0051] The preparation method of the field-induced reversible nonlinear conductive composite material comprises the following steps:

[0052] Front (1)-(6) is the same as embodiment 1.

[0053] (7) First weigh 5 g of PVA (the degree of polymerization is 1750±50, the degree of alcoholysis is 99%) and 90ml of deionized water are placed in a round bottom flask, and stirred magnetically for half an hour at room temperature to volatilize the impurities and make the PVA Sufficient swelling to avoid skin ingrowth during dissolution. Then increase the temperature, heat deionized water to 90 °C, and continue stirring for about 1.5 h until the PVA is completely dissolved to obtain solution G. Take 8 parts of AgNWs@TiO prepared in step (6) 2 (Among them, 1 part of AgNWs@TiO prepared in step (6) 2 Refers to the AgNWs@TiO obtained from 1 part of AgNWs prepared in step (5) and then treated in step (6) 2 Composite particles) were added to solution G, the temperature was adjusted to 65°C, ...

Embodiment 3

[0055] The preparation method of the field-induced reversible nonlinear conductive composite material comprises the following steps:

[0056] Front (1)-(6) is the same as embodiment 1.

[0057] (7) First weigh 5 g of PVA (the degree of polymerization is 1750±50, the degree of alcoholysis is 99%) and 90ml of deionized water are placed in a round bottom flask, and stirred magnetically for half an hour at room temperature to volatilize the impurities and make the PVA Sufficient swelling to avoid skin ingrowth during dissolution. Then increase the temperature, heat the deionized water to 90 °C, and keep stirring for about 1.5 h until the PVA is completely dissolved to obtain solution G. Take 10 parts of AgNWs@TiO prepared in step (5) 2 (Among them, 1 part of AgNWs@TiO prepared in step (6) 2 Refers to the AgNWs@TiO obtained from 1 part of AgNWs prepared in step (5) and then treated in step (6) 2 Composite particles) were added to solution G, the temperature was adjusted to 65°C,...

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Abstract

The invention relates to the field of conductive composite materials and discloses a method for preparing a field reversible nonlinear conductive composite material, the material prepared by the method and application of the material. The method includes weighing AgNWs, adding the AgNWs into absolute alcohol, adding TGA, stirring the mixture, then adding TBT, fully mixing the mixture, then heatingthe mixture to 180-210 DEG C, reacting the mixture for 9-11 h, performing centrifugation to obtain precipitate, and washing the precipitate to obtain AgNWs@TiO2; weighing PVA and water, stirring themixture, heating the mixture to 85-95 DEG C and stirring the mixture until the PVA is dissolved to obtain a solution G; weighting the AgNWs@TiO2, adding the AgNWs@TiO2 into the solution G, stirring the solution at 60-70 DEG C for 10-15 h to obtain a composite material fluid, and performing casting to form film, then the field reversible nonlinear conductive composite material can be obtained afterthe solvent is volatilized. The mass ratio of the AgNWs, the TGA and the TBT is 100:210-220:20; the degree of polymerization of the PVA is 1750 + / - 50, and the alcoholysis degree is 99%; and the massratio of the PVA to the AgNWs@TiO2 is 60:30-50. The method has characteristics including a simple process, a low cost, short reaction time and easy preparation in a large scale. The prepared composite material is uniform in distribution, good in dispersibility and free of agglomeration, and can be applied in overvoltage protection, lightning stroke surge and self-adaption electromagnetic pulse protection fields.

Description

technical field [0001] The invention relates to the field of conductive composite materials, in particular to a method for making a field-induced reversible nonlinear conductive composite material, the prepared material and its application. Background technique [0002] With the wide application of large-scale integrated circuits in electronic information systems, the anti-interference and anti-damage capabilities in complex and strong electromagnetic environments are getting worse; and the application of electromagnetic pulse weapon technology, the electromagnetic protection of electronic information systems is facing more and more challenges. increasingly severe real threats. Traditional electromagnetic protection materials play the role of electromagnetic protection by shielding and absorbing electromagnetic pulses. This type of electromagnetic protection material also has a shielding effect on electromagnetic signals of communication, so it is not suitable for the protec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L29/04C08K9/10C08K3/08C08K3/22H01B1/22B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCC08J5/18H01B1/22B22F9/24B82Y30/00B82Y40/00C08J2329/04C08K9/10C08K2003/0806C08K2003/2241C08K2201/001C08K2201/011B22F1/0547
Inventor 曲兆明卢聘王庆国
Owner ARMY ENG UNIV OF PLA
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