A protection method for electrification inside a spacecraft circuit board

A technology for circuit boards and internal electrification, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of increased shielding layer thickness, high radiation-induced resistivity, and limited protective effect of internal electrification effects, and achieve lower resistivity, Strong adaptability, the effect of reducing the risk of discharge

Active Publication Date: 2017-07-07
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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Problems solved by technology

However, due to the limitation of the weight of the spacecraft, the thickness of the shielding layer cannot be greatly increased
On the other hand, most of the circuit boards currently used in spacecraft are made of FR4 materials, and the surface of the circuit must be coated with a layer of conformal coating (conformal paint). The resistance of these two materials is high, and the radiation-induced resistivity is also high. , therefore, the protective effect of the grounding measures on the internal electrification effect is relatively limited

Method used

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Embodiment Construction

[0030] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0031] 1. Preparation of polyaniline nanoparticles:

[0032] (1) get xylene 80ml in the beaker of 250ml, add 1g sodium dodecylbenzenesulfonate (SDBS) therein, seal and stir 1h, wherein xylene is an organic phase solvent, and sodium dodecylbenzenesulfonate is Surfactant.

[0033] (2) get 40ml of hydrochloric acid whose volume percentage concentration is 25%, add 3.3ml of aniline to it, seal and stir for 1h;

[0034] (3) adding the aniline hydrochloric acid solution into the separating funnel, adding it dropwise to the organic phase, sealing and stirring for 1 h to obtain emulsion system 1; wherein aniline is the raw material for preparing polyaniline by reaction, and hydrochloric acid plays a role of doping, In order to improve the conductivity of polyaniline, the water in the aniline hydrochloric acid solution is combined with the hydrophilic group of...

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Abstract

The invention discloses a method for protecting the electric charge inside the circuit board of a spacecraft, which comprises the following steps: step 1, adding polyaniline nanoparticles into m-cresol solvent and mixing evenly; then adding the diluent of the conformal paint as an organic phase Auxiliary solvent, finally adding the solution into the three anti-paint to obtain protective coating materials; step 2, cleaning the circuit board, and evenly spraying the ethanol solution of silicon coupling agent on the surface of the circuit board; step 3, uniformly spraying on the circuit board The protective coating material prepared by spraying step 1; the present invention reduces the resistivity of the protective coating by adding polyaniline nanoparticles in the existing protective coating (three anti-paint), and reduces the risk of discharge; meanwhile, by Adjusting the ratio of polyaniline nanoparticles can adjust the size of the resistivity of the protective coating, so that the protection method of the present invention has stronger adaptability; the protection method of the present invention is simple and easy to operate, and will not impose additional requirements on the spacecraft design. Require.

Description

technical field [0001] The invention relates to the technical field of spacecraft space environment effect protection, in particular to a protection method for electrification in a spacecraft circuit board. Background technique [0002] Internal charging effect refers to the phenomenon that high-energy electrons (energy in the range of 0.1-10MeV) in earth space pass through the shielding layer of the spacecraft, and deposit and discharge on the surface of the interior material (such as circuit board) or inside the dielectric material (millimeter-level depth) of the spacecraft. . When the electric field strength exceeds the breakdown threshold of the material, the resulting electrical discharge can severely damage satellite components. Since the internal charging effect usually occurs inside the spacecraft, the damage to the spacecraft is relatively serious. [0003] Medium Earth Orbit (MEO) is located in the extraterrestrial radiation belt, and the flux density of high-ene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/12C09D175/04C08G73/02
Inventor 史亮李得天汤道坦柳青赵呈选陈益峰秦晓刚杨生胜高原
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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