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Silicone rubber-based wave-absorbing patch and preparation method thereof

A technology of wave absorbing patch and silicone rubber, applied in the field of silicone rubber-based wave absorbing patch and its preparation, can solve problems such as environmental pollution, and achieve the effects of solving the dispersion uniformity and improving the filling ratio

Inactive Publication Date: 2020-04-21
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the surface modification of the magnetic absorber, the compatibility of the magnetic absorber is improved; at the same time, the organic silicon resin is added to improve the dispersion effect of the absorber and endow the silicone rubber with viscosity-increasing properties, which improves the mechanical properties of the wave-absorbing patch and avoids the addition of organic solvents. pollution and other issues

Method used

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  • Silicone rubber-based wave-absorbing patch and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Test materials: In parts by weight, 800 parts of modified flake carbonyl iron powder, 100 parts of methyl vinyl silicone rubber, 1 part of white carbon black, 2 parts of silicone resin, 2 parts of vulcanizing agent.

[0027] Specific implementation steps:

[0028] Step 1. Choose a sheet-shaped magnetic absorbent with a size of 1μm, add it to the ethanol solution of the silane coupling agent (KH570) with a mass concentration of 5%, heat it at 70°C under mechanical stirring, react for 8 hours and then wash with ethanol , Dry to obtain a surface-modified flake magnetic absorbent, that is, a modified flake magnetic absorbent;

[0029] Step 2. According to the raw material ratio, add the raw silicone rubber on the open mill, then add white carbon black for reinforcement, continue mixing, then gradually add the modified flake magnetic absorbent and silicone resin, and finally add the vulcanization Constant refining;

[0030] Step 3: Put the prepared film into the mold cavity with a ...

Embodiment 2

[0034] Test materials: In parts by weight, 1000 parts of modified flake sendust powder, 100 parts of methyl phenyl vinyl silicone rubber, 5 parts of white carbon black, 10 parts of silicone resin, 5 parts of vulcanizing agent.

[0035] Specific implementation steps:

[0036] Step 1. Choose a sheet-shaped magnetic absorbent with a size of 50μm, add it to the ethanol solution of silane coupling agent (KH560 and KH570) with a mass concentration of 5%, heat it at 70°C under mechanical stirring, and react for 8 hours. Washing and drying with ethanol to obtain a surface-modified flake magnetic absorbent, that is, a modified flake magnetic absorbent;

[0037] Step 2. According to the raw material ratio, add the raw silicone rubber on the open mill, then add white carbon black for reinforcement, continue mixing, then gradually add the modified flake magnetic absorbent and silicone resin, and finally add the vulcanization Constant refining;

[0038] Step 3: Put the prepared film into the mold...

Embodiment 3

[0041] Test materials: 800-1000 parts by weight of modified flaky carbonyl iron powder, 100 parts of methyl vinyl silicone rubber, 1-5 parts of white carbon black, 2-10 parts of silicone resin, 2-5 parts of vulcanizing agent .

[0042] The specific implementation steps are as follows:

[0043] Step 1. Select the sheet-shaped magnetic absorbent with a size of 1-50μm, add it to the ethanol solution containing 5% mass fraction of the silane coupling agent (KH550), heat it at 70°C under mechanical stirring, and react for 8 hours, then ethanol wash and dry Obtain a surface-modified sheet-shaped magnetic absorbent;

[0044] Step 2. According to the raw material ratio, add the raw silicone rubber on the open mill, then add white carbon black for reinforcement, continue mixing, and then gradually add surface-modified flake magnetic absorbent and silicone resin, and finally gradually Continuous mixing by adding vulcanizing agent;

[0045] Step 3: Put the prepared film into the mold cavity, t...

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Abstract

The invention relates to the technical field of wave-absorbing patches, and provides a silicone rubber-based wave-absorbing patch and a preparation method thereof. According to the silicon rubber wave-absorbing patch and the novel preparation method, high-filling-ratio preparation of the silicon rubber-based wave-absorbing patch with good mechanical properties is realized on the basis of surface treatment with a sheet-shaped absorbent, addition of organic silicon resin and the like, and manufacturing of the high-performance wave-absorbing patch material can be realized. The silicone rubber-based wave-absorbing patch solves the problems of low absorbent filling proportion and difficulty in forming in silicon rubber, the problem of dispersion uniformity is solved through surface treatment with a flaky magnetic absorbent, and the filling proportion is increased. A magnetic absorbent, silicone rubber, white carbon black, silicon resin, a vulcanizing agent and the like are adopted to be filled and mixed according to a certain proportion, and the wave-absorbing patch is prepared through hot pressing after uniform mixing. The thickness of the obtained silicone rubber-based wave-absorbingpatch is 0.2-3mm, the filling proportion of the magnetic absorbent is greater than or equal to 80%, and the elongation at break is greater than or equal to 100%.

Description

Technical field [0001] The invention relates to the technical field of wave absorbing patches, in particular to a silicon rubber-based wave absorbing patch and a preparation method thereof. Background technique [0002] With the development of aviation stealth weapons and equipment, the requirements for the maintenance and replacement of stealth materials for weapons and equipment are getting higher and higher, and the method of using absorbing patches can meet the requirements. At present, the stealth parts of aeronautical weapons and equipment show multiple curvatures, multiple structures, and some locations are easily damaged. Therefore, the wave-absorbing coating spraying method adopted will cause difficulties in construction, long construction period, repeated maintenance in later stages, and high maintenance costs. Compared with the traditional spray absorbing coating, the absorbing patch material has the advantages of pre-preparation, adjustable thickness, pre-detectable p...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/04C08K9/06C08K7/26C08K7/00
CPCC08K2201/01C08L83/04C08L2205/025C08K9/06C08K7/26C08K7/00
Inventor 张行韦国科尹贻超高路
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST