Ultrahigh-temperature-resistant elastic-wall flat cable

Abstract

The invention relates to the technical field of cables, in particular to an ultra-high-temperature-resistant elastic-wall flat cable which is of a flat structure and is formed by weaving a cable core serving as weaving yarn and inorganic fibers serving as axial yarn. The cable core sequentially comprises a conductor, a polyimide film insulating layer, a first mica tape wrapping layer, an illite-based aerogel felt, a second mica tape wrapping layer and an aramid fiber sleeve from inside to outside, the flat structure enables the cable to be arranged in order, the occupied space is small, under the condition that the internal space of a missile is limited, the space can be utilized more effectively, and the service life of the missile is prolonged. According to the utility model, the occupied area of the cable is reduced, so that the layout is optimized, the installation and maintenance are more convenient, the cable can pass through a narrow space and a complex wiring path more easily, troubleshooting and replacement are easier in the maintenance process, and the cable can tolerate instantaneous jet of ultra-high-temperature flame and can stably work for a period of time in a high-temperature environment.

Description

Technical Field

[0001] The invention relates to the technical field of cables, and in particular to an ultra-high temperature resistant elastic-wall flat cable. Background Art

[0002] Cables are the "blood vessels" and "nerves" of mechanical equipment. The electrical energy and information they transmit maintain the normal operation of mechanical equipment. For aircraft with a missile shape, due to the limited internal space and the ultra-high temperature of about 2000℃ generated by the instantaneous ejection of the tail flame during launch, higher requirements are placed on the design of cables. Summary of the invention

[0003] Purpose of the invention: In view of the above technical problems, the present invention proposes an ultra-high temperature resistant elastic wall flat cable.

[0004] The technical solutions adopted are as follows: An ultra-high temperature resistant elastic wall flat cable: having a flat structure, woven with a cable core as a braided yarn and inorganic fibers as an axis yarn; The cable core includes, from inside to outside, a conductor, a polyimide film insulation layer, a first mica tape wrapping layer, an illite-based aerogel felt, a second mica tape wrapping layer and an aramid fiber sleeve; The ultra-high temperature resistant elastic wall flat cable can be powered normally for more than 120 minutes at a flame temperature of 1950-2050°C.

[0005] Furthermore, the preparation method of the illite-based aerogel felt is as follows: After the illite is crushed, it is fully washed with deionized water and then dried. After being calcined, it is added to a sodium hydroxide solution. After a sealed hydrothermal reaction at 120°C for 10 hours, the precipitate is filtered out, the filtrate is collected and its pH is adjusted to 6, and the fiber felt is added thereto and fully soaked to obtain a wet fiber felt. The wet fiber felt is then aged, the solvent is replaced, and then dried.

[0006] Furthermore, the calcination temperature is 400-600° C., and the calcination time is 1-5 h.

[0007] Furthermore, the concentration of the sodium hydroxide solution is 2-6 mol / L.

[0008] Furthermore, the aging temperature is ≥60°C, and the aging time is 1-5h.

[0009] Further, the aging is carried out in an ionic liquid.

[0010] Furthermore, the ionic liquid is 1-butyl-3-methylimidazolium hexafluorophosphate and / or 1-butyl-3-methylimidazolium tetrafluoroborate.

[0011] Furthermore, during the solvent replacement, the solvent is replaced in deionized water, ethanol and n-hexane for 1-3 d respectively.

[0012] Furthermore, the drying temperature is ≤50°C.

[0013] Furthermore, the inorganic fibers are quartz fibers and / or glass fibers.

[0014] Beneficial effects of the present invention: The present invention provides an ultra-high temperature resistant elastic wall flat cable, which has a special flat structure and can be arranged neatly and occupy less space. When the internal space of a missile is limited, the space can be used more effectively, the area occupied by the cable can be reduced, and the layout can be optimized. The cable is more convenient to install and maintain, and can pass through narrow spaces and complex wiring paths more easily. During maintenance, it is also easier to troubleshoot and replace the cable. The cable can withstand instantaneous jetting of ultra-high temperature flames and can be normally powered on for more than 120 minutes under ultra-high temperature flames of about 2000°C. The working temperature of the polyimide film in the cable of the present invention is -65 to 260°C, and can reach 500°C in a short term. It has excellent electrical properties and weather resistance, and can prevent short circuit breakdown when the cable is sprayed with high-temperature flames. The mica tape has excellent high temperature resistance, with a melting point of up to 1375°C and does not contain crystal water, so it has a large safety margin at high temperatures, and can withstand high temperatures for a long time while maintaining stable performance. In the present invention, the first mica tape wrapping layer, the second mica tape wrapping layer and the illite-based aerogel felt form a "sandwich" type insulation interlayer, which can effectively maintain the stable operation of the cable in an ultra-high temperature environment; Illite is a common crystalline mineral. Roasting can activate it, causing the tetrahedron and octahedron structures in the structure to adjust and deform, so that the chemical environment of aluminum and silicon changes, the dissolution reaction activity in the sodium hydroxide solution is enhanced, and Al-Si-O composite oxides may be generated in the hydrothermal reaction, gelation and aging process, so that the skeleton support of the aerogel is stronger, and the pores are not easy to collapse, thereby achieving a better thermal insulation effect. The aging conditions have a great influence on the microstructure of the aerogel. The present invention uses ionic liquid as an aging solvent, which can avoid damage to the gel skeleton and can effectively promote dehydration condensation between gel particles, so that the dissolution and reprecipitation effect of the aerogel skeleton particles is enhanced, and more nano-microporous structures are formed under the unique induction of the ionic liquid, the pore volume is increased, and the thermal insulation effect is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of the cable core in Example 1, where the numbers represent: 1001-conductor, 1002-polyimide film insulation layer, 1003-first mica tape wrapping layer, 1004-illite-based aerogel felt, 1005-second mica tape wrapping layer, 1006-aramid fiber sleeve; Figure 2 This is a schematic diagram of the structure of the ultra-high temperature resistant elastic wall flat cable in Example 1, in which the reference numerals represent: 1-cable core, 2-quartz fiber. DETAILED DESCRIPTION

[0016] If the specific conditions are not specified in the examples, the experiments were carried out under conventional conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased commercially. The techniques not mentioned in the present invention are all referenced to the prior art. Unless otherwise specified, the following examples and comparative examples are parallel experiments, using the same processing steps and parameters.

[0017] Embodiment 1: An ultra-high temperature resistant elastic flat cable, with a cable core 1 as a braiding yarn and a quartz fiber 2 as an axis yarn, is woven into a flat structure on a KBL type braiding machine. The specific structural schematic diagram is shown in Figure 2 As shown; The cable core 1 includes, from the inside to the outside, a conductor 1001, a polyimide film insulation layer 1002, a first mica tape wrapping layer 1003, an illite-based aerogel felt 1004, a second mica tape wrapping layer 1005, and an aramid fiber sleeve 1006; The preparation method of illite-based aerogel felt 1004 is as follows: Take 1000g of illite, crush it through an 80-mesh sieve, wash it thoroughly with deionized water, remove water-soluble impurities, dry it in an oven at 80℃ for 24h, take it out and place it in a muffle furnace at 500℃ for calcination for 2h to obtain activated illite powder, add the activated illite powder to 10L of 4mol / L sodium hydroxide solution, stir and mix well, seal it, heat it to 120℃ for hydrothermal reaction for 10h, return to room temperature and filter it, collect the filtrate and adjust its pH with 1mol / L hydrochloric acid solution to 6, add glass fiber felt and immerse it for 60 minutes, take it out and let it stand until no slurry drips to obtain wet fiber felt, then immerse the wet fiber felt in an appropriate amount of 1-butyl-3-methylimidazolium hexafluorophosphate and heat it to 70°C, keep it warm and age for 2 hours, take it out and let it stand until no liquid drips, then place it in deionized water for replacement for 2 days, and then place it in ethanol and n-hexane for replacement for 1 day respectively. During the replacement, replace the fresh solvent every 12 hours, and finally dry it in a 50°C oven for 24 hours.

[0018] With reference to the fire resistance test in Appendix D of the British fire-resistant cable standard BS6387, the fire resistance of the ultra-high temperature resistant elastic wall flat cable prepared in this embodiment was tested, the test flame temperature was 2000±50°C, and the continuous normal power-on time was ≥120min.

[0019] Embodiment 2: The method is substantially the same as Example 1, except that 1-butyl-3-methylimidazolium tetrafluoroborate is used instead of 1-butyl-3-methylimidazolium hexafluorophosphate.

[0020] The preparation method of illite-based aerogel felt 1004 is as follows: Take 1000g of illite, crush it through an 80-mesh sieve, wash it thoroughly with deionized water, remove water-soluble impurities, dry it in an oven at 80℃ for 24h, take it out and place it in a muffle furnace at 500℃ for calcination for 2h to obtain activated illite powder, add the activated illite powder to 10L of 4mol / L sodium hydroxide solution, stir and mix well, seal it, heat it to 120℃ for hydrothermal reaction for 10h, return to room temperature and filter it, collect the filtrate and adjust its pH with 1mol / L hydrochloric acid solution To 6, add glass fiber felt and immerse it for 60 minutes, take it out and let it stand until no slurry drips to obtain wet fiber felt, then immerse the wet fiber felt in an appropriate amount of 1-butyl-3-methylimidazolium tetrafluoroborate and heat it to 70°C, keep it warm and age for 2 hours, take it out and let it stand until no liquid drips, then place it in deionized water for replacement for 2 days, and then place it in ethanol and n-hexane for replacement for 1 day respectively. During the replacement, replace the fresh solvent every 12 hours, and finally dry it in a 50°C oven for 24 hours.

[0021] With reference to the fire resistance test in Appendix D of the British fire-resistant cable standard BS6387, the fire resistance of the ultra-high temperature resistant elastic wall flat cable prepared in this embodiment was tested, the test flame temperature was 2000±50°C, and the continuous normal power-on time was ≥120min.

[0022] Embodiment 3: It is basically the same as Example 1, except that the aging temperature is reduced to 60°C.

[0023] The preparation method of illite-based aerogel felt 1004 is as follows: Take 1000g of illite, crush it through an 80-mesh sieve, wash it thoroughly with deionized water, remove water-soluble impurities, dry it in an oven at 80℃ for 24h, take it out and place it in a muffle furnace at 500℃ for calcination for 2h to obtain activated illite powder, add the activated illite powder to 10L of 4mol / L sodium hydroxide solution, stir and mix well, seal it, heat it to 120℃ for hydrothermal reaction for 10h, return to room temperature and filter it, collect the filtrate and adjust its pH with 1mol / L hydrochloric acid solution To 6, add glass fiber felt and immerse it for 60 minutes, take it out and let it stand until no slurry drips to obtain wet fiber felt, then immerse the wet fiber felt in an appropriate amount of 1-butyl-3-methylimidazole hexafluorophosphate and heat it to 60°C. After heat aging for 2 hours, take it out and let it stand until no liquid drips, then place it in deionized water for replacement for 2 days, and then place it in ethanol and n-hexane respectively for replacement for 1 day. During the replacement, replace the fresh solvent every 12 hours, and finally dry it in a 50°C oven for 24 hours.

[0024] With reference to the fire resistance test in Appendix D of the British fire-resistant cable standard BS6387, the fire resistance of the ultra-high temperature resistant elastic wall flat cable prepared in this embodiment was tested, the test flame temperature was 2000±50°C, and the continuous normal power-on time was ≥120min.

[0025] Embodiment 4: It is basically the same as Example 1, except that the aging temperature is increased to 80°C.

[0026] The preparation method of illite-based aerogel felt 1004 is as follows: Take 1000g of illite, crush it through an 80-mesh sieve, wash it thoroughly with deionized water, remove water-soluble impurities, dry it in an oven at 80℃ for 24h, take it out and place it in a muffle furnace at 500℃ for calcination for 2h to obtain activated illite powder, add the activated illite powder to 10L of 4mol / L sodium hydroxide solution, stir and mix well, seal it, heat it to 120℃ for hydrothermal reaction for 10h, return to room temperature and filter it, collect the filtrate and adjust its pH with 1mol / L hydrochloric acid solution to 6, add glass fiber felt and immerse it for 60 minutes, take it out and let it stand until no slurry drips to obtain wet fiber felt, then immerse the wet fiber felt in an appropriate amount of 1-butyl-3-methylimidazole hexafluorophosphate and heat it to 80°C, keep it for aging for 2 hours, take it out and let it stand until no liquid drips, then place it in deionized water for replacement for 2 days, and then put it in ethanol and n-hexane for replacement for 1 day respectively. During the replacement, replace the fresh solvent every 12 hours, and finally dry it in a 50°C oven for 24 hours.

[0027] With reference to the fire resistance test in Appendix D of the British fire-resistant cable standard BS6387, the fire resistance of the ultra-high temperature resistant elastic wall flat cable prepared in this embodiment was tested, the test flame temperature was 2000±50°C, and the continuous normal power-on time was ≥120min.

[0028] Embodiment 5: It is basically the same as Example 1, except that the aging temperature is increased to 90°C.

[0029] The preparation method of illite-based aerogel felt 1004 is as follows: Take 1000g of illite, crush it through an 80-mesh sieve, wash it thoroughly with deionized water, remove water-soluble impurities, dry it in an oven at 80℃ for 24h, take it out and place it in a muffle furnace at 500℃ for calcination for 2h to obtain activated illite powder, add the activated illite powder to 10L of 4mol / L sodium hydroxide solution, stir and mix well, seal it, heat it to 120℃ for hydrothermal reaction for 10h, return to room temperature and filter it, collect the filtrate and adjust its pH with 1mol / L hydrochloric acid solution to 6, add glass fiber felt and immerse it for 60 minutes, take it out and let it stand until no slurry drips to obtain wet fiber felt, then immerse the wet fiber felt in an appropriate amount of 1-butyl-3-methylimidazolium hexafluorophosphate and heat it to 90°C, keep it warm and age for 2 hours, take it out and let it stand until no liquid drips, then place it in deionized water for replacement for 2 days, and then place it in ethanol and n-hexane respectively for replacement for 1 day, replace fresh solvent every 12 hours during replacement, and finally dry it in a 50°C oven for 24 hours.

[0030] With reference to the fire resistance test in Appendix D of the British fire-resistant cable standard BS6387, the fire resistance of the ultra-high temperature resistant elastic wall flat cable prepared in this embodiment was tested, the test flame temperature was 2000±50°C, and the continuous normal power-on time was ≥120min.

[0031] Comparative Example: The method is basically the same as Example 1, except that the wet fiber felt is not added into 1-butyl-3-methylimidazolium hexafluorophosphate, but is directly placed in an oven at 70° C. for aging.

[0032] With reference to the fire resistance test in Appendix D of the British fire-resistant cable standard BS6387, the fire resistance of the ultra-high temperature resistant elastic wall flat cable prepared in this comparative example was tested. The test flame temperature was 2000±50°C and the continuous normal power-on time was 86min.

[0033] Performance testing: The illite-based aerogel felt prepared in Examples 1-5 and the comparative example was used as a test sample; The thermal conductivity of the sample was tested using a TC3200 thermal conductivity meter. The sample was placed in a room temperature chamber during the test. Unit: W / (m·K); The pore volume of the sample was tested using the ASAP2460 fully automatic specific surface area and pore size tester. The sample was placed in a room temperature during the test. The unit is ml / g. The test results are shown in Table 1 below: ; As can be seen from Table 1 above, the illite-based aerogel felt prepared in the present invention has an extremely low thermal conductivity; From the comparison between Example 1 and Example 2, it can be seen that different ionic liquids have different effects on the thermal insulation performance of illite-based aerogel felt; From the comparison between Example 1 and Examples 3-5, it can be seen that different aging temperatures have different effects on the thermal insulation performance of illite-based aerogel felt. When the aging temperature is 70°C, the thermal insulation performance of illite-based aerogel felt is optimal. From the comparison between Example 1 and the comparative example, it can be seen that the ionic liquid, as a medium solvent during aging, has a positive effect on the microstructure and thermal insulation performance of the illite-based aerogel felt.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultra-high temperature resistant elastic wall flat cable, characterized in that: It has a flat structure, woven with cable core as braiding yarn and inorganic fiber as axis yarn; The cable core includes, from inside to outside, a conductor, a polyimide film insulation layer, a first mica tape wrapping layer, an illite-based aerogel felt, a second mica tape wrapping layer and an aramid fiber sleeve; The ultra-high temperature resistant elastic wall flat cable can be powered normally for more than 120 minutes at a flame temperature of 1950-2050°C.

2. The ultra-high temperature resistant elastic-wall flat cable according to claim 1, characterized in that: The preparation method of the illite-based aerogel felt is as follows: After the illite is crushed, it is fully washed with deionized water and then dried. After being calcined, it is added to a sodium hydroxide solution. After a sealed hydrothermal reaction at 120°C for 10 hours, the precipitate is filtered out, the filtrate is collected and its pH is adjusted to 6, and the fiber felt is added thereto and fully soaked to obtain a wet fiber felt. The wet fiber felt is then aged, the solvent is replaced, and then dried.

3. The ultra-high temperature resistant elastic-wall flat cable according to claim 2, characterized in that: The calcination temperature is 400-600°C and the calcination time is 1-5h.

4. The ultra-high temperature resistant elastic-wall flat cable according to claim 2, characterized in that: The concentration of the sodium hydroxide solution is 2-6 mol / L.

5. The ultra-high temperature resistant elastic-wall flat cable according to claim 2, characterized in that: The aging temperature is ≥60℃ and the aging time is 1-5h.

6. The ultra-high temperature resistant elastic-wall flat cable according to claim 5, characterized in that: Aging was carried out in ionic liquid.

7. The ultra-high temperature resistant elastic-wall flat cable according to claim 6, characterized in that: The ionic liquid is 1-butyl-3-methylimidazolium hexafluorophosphate and / or 1-butyl-3-methylimidazolium tetrafluoroborate.

8. The ultra-high temperature resistant elastic-wall flat cable according to claim 2, characterized in that: During solvent replacement, the solvent was replaced in deionized water, ethanol and n-hexane for 1-3 days respectively.

9. The ultra-high temperature resistant elastic-wall flat cable according to claim 2, characterized in that: Drying temperature ≤50℃.

10. The ultra-high temperature resistant elastic-wall flat cable according to claim 1, characterized in that: The inorganic fibers are quartz fibers and / or glass fibers.

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