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Low resistivity filler and preparation method of antistatic thermal control coating

A low-resistivity, thermal-control coating technology, applied in coatings, conductive coatings, etc., can solve problems such as interfering with the work of electronic equipment on the planet, and achieve the effects of good adhesion, strong implementability, and low vacuum outgassing

Active Publication Date: 2019-09-17
SHANGHAI INST OF SATELLITE EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the surface materials of the spacecraft are insulated, they will be charged to different potentials in the space plasma. When the charging potential exceeds the breakdown threshold or the surface potential of the spacecraft changes instantaneously due to the change of charging conditions, discharge may occur, thereby disturbing the satellite. Work on electronic equipment, causing various failures of spacecraft

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  • Low resistivity filler and preparation method of antistatic thermal control coating
  • Low resistivity filler and preparation method of antistatic thermal control coating
  • Low resistivity filler and preparation method of antistatic thermal control coating

Examples

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preparation example Construction

[0021] Such as Figure 1 Shown, the preparation method of low-resistivity filler and antistatic thermal control coating thereof, it comprises the following steps:

[0022] Step 1, preparation of low-resistivity filler: Weigh a certain quality of zinc oxide powder, add distilled water for ultrasonic dispersion and stir thoroughly; titrate aluminum isopropoxide ethanol solution to zinc oxide suspension; add ammonia water dropwise to adjust the pH value of the solution, React for a certain period of time; then filter, wash, and dry in a vacuum oven; finally, put the modified zinc oxide powder into a high-temperature furnace for sintering and annealing;

[0023] Step 2, preparation of antistatic coating: Add modified zinc oxide powder to multifunctional methyl silicone resin, mix and stir, add organic solvent, mix, and ultrasonically stir evenly;

[0024] Step 3, preparation of antistatic coating: Add modified zinc oxide powder to multifunctional methyl silicone resin, mix and st...

Embodiment 1

[0026] This embodiment relates to the preparation method of the low-resistivity filler and its antistatic thermal control coating.

[0027] The new antistatic white thermal control coating of this embodiment is composed of multifunctional methyl silicone resin and modified zinc oxide.

[0028] The low-resistivity zinc oxide filler in this example is modified by metal ion doping and high-temperature sintering of zinc oxide. First, it is treated with metal aluminum ion doping and anti-static modification, and after drying, it is thermally sintered at 900°C for 3 Hour. And thermal annealing at 700°C for 1.5 hours.

[0029] The specific preparation method of the new antistatic white thermal control coating in this embodiment includes the following steps: methyl phenyl silicone resin, polyurethane modified methyl silicone resin, cyanate ester modified methyl silicone resin, epoxy modified methyl silicone resin Silicone.

[0030] Antistatic coating preparation: Add low-resistivit...

Embodiment 2

[0033] This embodiment relates to a preparation method of a low-resistivity filler and an antistatic thermal control coating thereof.

[0034] This embodiment is basically the same as Embodiment 1, the difference is:

[0035] Antistatic coating preparation: Add low-resistivity zinc oxide powder to methylphenyl silicone resin, mix and stir, add acetone, mix, and ultrasonically stir evenly; by mass percentage: low-resistivity zinc oxide powder filler accounts for 10% of the solid content of the coating 75wt%, multifunctional methyl silicone resin accounts for 25wt% of the total coating, the mass ratio of methylphenyl silicone resin and low-resistivity zinc oxide powder is 25:75, and the acetone diluent is low-resistivity zinc oxide according to its dosage Add 0.7 times the total weight of powder and methylphenyl silicone resin.

[0036] Preparation of anti-static coating: In the process of preparing the coating, first spray the surface treatment agent → cure at 18-35°C for 1-2 ...

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Abstract

The invention provides a method for preparing a low-resistivity filler and an anti-electrostatic thermal control coating thereof. The low-resistivity filler is obtained through carrying out doping modification on zinc oxide by metal ions and carrying out high-temperature sintering aftertreatment; the anti-electrostatic thermal control coating takes polyfunctional methyl silicone resin as a matrix and the low-resistivity doping-modified zinc oxide powder as a filler, and doping-modified zinc oxide can form a conductive network in the coating. According to the anti-electrostatic thermal control coating prepared by the method, the appearance is white, the thickness is 130 to 180 microns, the solar absorption ratio is 0.22 to 0.27, the hemispherical emittance is 0.85 to 0.91, the total mass loss TML is lower than 1%, the condensable volatile matter CVCM is lower than 0.1%, the volume resistivity [rho]V is not greater than 10<7> omegam, and after the coating is subjected to -100 DEG C-to-+100 DEG C high- / low-temperature heat cycle tests for 100 times, the coating is free of cracking, peeling, blistering and discoloring phenomena and is stable in optical performance and good in adhesive power, so that the requirements of spacecrafts on anti-electrostatic white thermal control coatings are fundamentally met.

Description

technical field [0001] The invention relates to the technical field of thermal control materials, in particular to a preparation method of a low-resistivity filler and an antistatic thermal control coating thereof. Background technique [0002] A large number of thermal control materials are used in the spacecraft thermal control system to keep the spacecraft temperature within a normal range. Thermal control coating is the most widely used and most effective thermal control material for spacecraft. Its function is to adjust the optical and thermal properties of the spacecraft surface (also known as thermal radiation performance) by adjusting the thermophysical properties of its own surface. The thermal control coating can reflect the electromagnetic radiation of the sun and radiate the heat generated by the on-board equipment and instruments into space, so as to achieve limited thermal control of the spacecraft and ensure the safety of the star and the normal operation of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/04C09D5/24C09D7/62
Inventor 曹康丽刘刚张丽新潘阳阳周博李瑜婧
Owner SHANGHAI INST OF SATELLITE EQUIP
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