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A preparation method of insulating material for aerospace cables

An insulating material, aerospace technology, applied in the direction of insulators, organic insulators, plastic/resin/wax insulators, etc., can solve material failure, poor anti-atomic oxygen performance, physical and chemical erosion hazards specific heat vacuum, ultraviolet radiation , cold and hot alternation, micrometeorites, space debris and other problems, to achieve the effect of improving compatibility, improving the performance of anti-atomic oxygen, improving compatibility and effective combination

Active Publication Date: 2017-03-01
江苏通光电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both the cable material and ordinary PVDF insulation materials have the defect of poor anti-atomic oxygen performance. Aerospace cables are in a vacuum environment, and the existence of atomic oxygen (AO) makes the cable insulation materials mainly made of organic polymers vulnerable. Severe erosion leads to the failure of the entire material. At the same time, atomic oxygen is a very strong oxidant, its oxidation performance is second only to fluorine, and it also has high kinetic energy. Therefore, the physical and chemical corrosion hazard ratio of AO to the insulation materials of aerospace cables Thermal vacuum, ultraviolet radiation, alternation of cold and heat, micrometeorites, space debris, etc. are much more serious, so ordinary PVDF insulation materials cannot be used for aerospace cables

Method used

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  • A preparation method of insulating material for aerospace cables

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Effect test

Embodiment 1

[0029] A preparation method for an insulating material for aerospace cables, the steps are as follows:

[0030] (1) Add aluminum nitrate nonahydrate into distilled water and stir evenly, add PEG and continue to stir for 1 hour, then add urea, the weight ratio of aluminum nitrate nonahydrate, PEG, and urea is 5:4:4, move to the water in the hydrothermal reaction kettle Heat reaction for 20 hours, after natural cooling, wash the obtained precipitate with water and ethanol for 5 times respectively, obtain aluminum ammonium carbonate fiber after suction filtration, place the aluminum ammonium carbonate fiber in a calciner at 1350°C and calcinate to obtain alumina fiber;

[0031] (2) Place the alumina fiber obtained in step (1) in a vacuum oven and dry it at 80°C for 2 hours, add the dried alumina fiber into the SDBS aqueous solution, and the weight ratio of the alumina fiber to SDBS is 12: 1. After 2 hours of magnetic stirring, reflux at 100°C for 2 hours, centrifuge after dischar...

Embodiment 2

[0035] A preparation method for an insulating material for aerospace cables, the steps are as follows:

[0036] (1) Add aluminum nitrate nonahydrate into distilled water and stir evenly, add PEG and continue to stir for 1 hour, then add urea, the weight ratio of aluminum nitrate nonahydrate, PEG, and urea is 5:4:4, move to the water in the hydrothermal reaction kettle Heat reaction for 20 hours, after natural cooling, wash the obtained precipitate with water and ethanol for 5 times respectively, obtain aluminum ammonium carbonate fiber after suction filtration, place the aluminum ammonium carbonate fiber in a calciner at 1350°C and calcinate to obtain alumina fiber;

[0037] (2) Place the alumina fiber obtained in step (1) in a vacuum oven and dry it at 80°C for 2 hours, add the dried alumina fiber into the SDBS aqueous solution, and the weight ratio of the alumina fiber to SDBS is 12: 1. After 2 hours of magnetic stirring, reflux at 100°C for 2 hours, centrifuge after dischar...

Embodiment 3

[0041] A preparation method for an insulating material for aerospace cables, the steps are as follows:

[0042] (1) Add aluminum nitrate nonahydrate into distilled water and stir evenly, add PEG and continue to stir for 1 hour, then add urea, the weight ratio of aluminum nitrate nonahydrate, PEG, and urea is 5:4:4, move to the water in the hydrothermal reaction kettle Heat reaction for 20 hours, after natural cooling, wash the obtained precipitate with water and ethanol for 5 times respectively, obtain aluminum ammonium carbonate fiber after suction filtration, place the aluminum ammonium carbonate fiber in a calciner at 1350°C and calcinate to obtain alumina fiber;

[0043] (2) Place the alumina fiber obtained in step (1) in a vacuum oven and dry it at 80°C for 2 hours, add the dried alumina fiber into the SDBS aqueous solution, and the weight ratio of the alumina fiber to SDBS is 12: 1. After 2 hours of magnetic stirring, reflux at 100°C for 2 hours, centrifuge after dischar...

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Abstract

The invention provides a preparation method of an insulating material for aerospace cables. The method comprises the following steps: 1, adding aluminum nitrate nonahydrate, adding PEG, adding urea, carrying out a hydrothermal reaction, naturally cooling, washing, carrying out pumping filtration to obtain ammonium aluminum carbonate fibers, and calcining to obtain alumina fibers; 2, drying the alumina fibers, adding an aqueous solution of SDBS, magnetically stirring, refluxing for 2h, discharging, centrifuging, washing the obtained precipitate, and drying to obtain modified alumina fibers; 3, mixing PVDF with DCP, DMF and MAH, carrying out fusion grafting granulation to obtain granules, and drying to obtain a solubilizer; and 4, mixing the PVDF with poly(fluoroalkoxyphosphazene) and the solubilizer to obtain a mixture, extruding to obtain a melt, squeezing the melt into a dipping head, preheating the modified alumina fibers, adding the mixture, impregnating to obtain an impregnant, cooling, and carrying out injection molding to obtain the insulating material for aerospace cables. The atomic oxygen resistance of the insulating material prepared in the invention is good.

Description

[0001] Technical field: [0002] The invention relates to an insulating material, in particular to a preparation method of an insulating material used for aerospace cables. [0003] Background technique: [0004] PVDF, the English abbreviation of Poly (vinylidene fluoride), mainly refers to the homopolymer of vinylidene fluoride or the copolymer of vinylidene fluoride and other small amount of fluorine-containing vinyl monomers. It has the characteristics of both fluororesin and general-purpose resin. In addition to good chemical corrosion resistance, high temperature resistance, oxidation resistance, weather resistance, and radiation resistance, it also has special properties such as piezoelectricity, dielectricity, and pyroelectricity. It ranks second in the output of fluorine-containing plastics It is a large product with a global annual production capacity of more than 53,000 tons. PVDF applications are mainly concentrated in the three major fields of petrochemical, electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08L85/02C08K9/04C08K7/08C08K5/14C08K5/1539D01F9/08H01B3/44
CPCC08L27/16C08L2201/08C08L2203/202D01F9/08H01B3/445C08L85/02C08K9/04C08K7/08C08K5/14C08K5/1539
Inventor 邬月良
Owner 江苏通光电子科技有限公司
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