Preparation method of microwave absorbing rubber composite material

A composite material and microwave absorption technology, which is applied in the field of preparation of functional polymer materials, can solve the problem that the microwave reflectivity does not change significantly, and achieve the effect of improving microwave absorption performance and absorption frequency range

Inactive Publication Date: 2011-06-29
SHANGHAI JIAO TONG UNIV
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  • Abstract
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Problems solved by technology

[0007] Physica B reported on pages 1343-1346 of volume 404 in 2009 that adding a small amount of multi-walled carbon nanotubes to the acrylic resin / carbonyl iron powder composite material broadened the microwave absorption frequency range of the composite material, but its microwave reflectivity was not obvious Variety

Method used

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  • Preparation method of microwave absorbing rubber composite material
  • Preparation method of microwave absorbing rubber composite material

Examples

Experimental program
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Effect test

Embodiment 1-2

[0029] Embodiment 1-2 (adopting one-time blending method to prepare)

[0030] By the formula of table 1, hydrogenated nitrile butadiene rubber, ethylene propylene rubber, multi-walled carbon nanotubes, carbonyl iron powder, acrylic acid (AA) and dicumyl peroxide (DCP) were mixed for 20min on a two-roller open mill, and controlled The roll temperature is lower than 60°C, and then vulcanized at 170°C for 20min to obtain a rubber composite material for microwave absorption. The complex permittivity and complex permeability of the material are tested by the transmission-reflection method, and converted into the microwave reflectivity of a microwave-absorbing rubber composite material with a certain thickness.

Embodiment 3-5

[0038] Embodiment 3-5 (prepared by segmental blending method)

[0039] According to the formula in Table 3, hydrogenated nitrile rubber, multi-walled carbon nanotubes and dicumyl peroxide were mixed for 10 minutes on a two-roll mill, and the controlled roll temperature was lower than 60°C to obtain hydrogenated nitrile rubber / carbon nanotubes Masterbatch;

[0040]According to the formula in Table 3, mix ethylene-propylene rubber, carbonyl iron powder and acrylic acid on a two-roll mill for 10 minutes, control the temperature of the rollers below 60°C, and then heat-press them on a flat vulcanizer at 120°C for 2 hours, and then heat them on a double-roll mill. Mix with dicumyl peroxide for 2 minutes on the open mill, and control the roll temperature below 60°C to obtain ethylene-propylene rubber / carbonyl iron powder masterbatch;

[0041] Mix the hydrogenated nitrile rubber / carbon nanotube masterbatch and ethylene propylene rubber / carbonyl iron powder masterbatch obtained above...

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Abstract

The invention discloses a preparation method of a microwave absorbing rubber composite material. In the method, hydrogenated nitrile-butadiene rubber (HNBR) and ethylene propylene rubber (EPM) which are incompatible are blended to form a matrix of the rubber composite material, and a phase separation structure of the obtained blend which is formed in the matrix can control the distribution of multi-walled carbon nanotubes (MWNTs) and carbonyl iron powder (CIP) in the rubber composite material, thus improving the microwave absorbing property of the rubber composite material. In the invention, the microwave absorbing rubber composite material is prepared by utilizing a one-time blending method and a multi-stage blending method. Compared with the rubber composite material which takes single HNBR as a matrix, the rubber composite material prepared from 10 parts by weight of the MWNTs and 100 parts by weight of the CIP by the one-time blending method has the advantages that the microwave reflectivity is reduced from minus 17.5dB to minus 40.5dB and the absorption frequency range is improved by 1.12GHz; and the rubber composite material prepared by the multi-stage blending method has the advantages that the microwave reflectivity is reduced from minus 17.5dB to minus 33.2dB and the absorption frequency range is improved by 0.24GHz.

Description

technical field [0001] The invention relates to a preparation method of a functional polymer material, in particular to a preparation method of a microwave-absorbing rubber composite material. Background technique [0002] In the information age, the widespread use of electronic and electrical equipment forms a complex electromagnetic environment, which brings problems such as electromagnetic radiation and electromagnetic interference. As a very common type of electromagnetic waves, microwaves will have adverse effects on human health and the operation of precision electronic instruments. Microwave absorbing materials can weaken or eliminate the microwave incident on the surface of the object, and are an important means to control microwave electromagnetic pollution. [0003] In modern warfare, the requirements for the stealth performance of weapons and equipment are getting higher and higher, which requires stealth materials to meet the requirements of strong microwave abs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/04C08L51/06C08K13/04C08K7/00C08K3/04C08K3/18C08L15/00C08L23/16C08K13/06C08K9/04B29B7/72
Inventor 翟滢皓张勇李佳任文坛
Owner SHANGHAI JIAO TONG UNIV
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