CN116978636B - Preparation method of composite insulation lapped wire for aviation - Google Patents
Preparation method of composite insulation lapped wire for aviation Download PDFInfo
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- CN116978636B CN116978636B CN202311005714.7A CN202311005714A CN116978636B CN 116978636 B CN116978636 B CN 116978636B CN 202311005714 A CN202311005714 A CN 202311005714A CN 116978636 B CN116978636 B CN 116978636B
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- 239000002131 composite material Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000009413 insulation Methods 0.000 title description 3
- 150000001336 alkenes Chemical class 0.000 claims abstract description 27
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims abstract description 27
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims abstract description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000004321 preservation Methods 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- FPYGTMVTDDBHRP-OWOJBTEDSA-N (e)-but-2-ene-1,4-diamine Chemical compound NC\C=C\CN FPYGTMVTDDBHRP-OWOJBTEDSA-N 0.000 claims abstract description 10
- OSDWBNJEKMUWAV-UHFFFAOYSA-N Allyl chloride Chemical compound ClCC=C OSDWBNJEKMUWAV-UHFFFAOYSA-N 0.000 claims abstract description 9
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003999 initiator Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 90
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 37
- 239000007788 liquid Substances 0.000 claims description 35
- 238000005266 casting Methods 0.000 claims description 24
- 238000001035 drying Methods 0.000 claims description 24
- 239000000805 composite resin Substances 0.000 claims description 21
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 9
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical group N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 6
- ANSXAPJVJOKRDJ-UHFFFAOYSA-N furo[3,4-f][2]benzofuran-1,3,5,7-tetrone Chemical compound C1=C2C(=O)OC(=O)C2=CC2=C1C(=O)OC2=O ANSXAPJVJOKRDJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000004014 plasticizer Substances 0.000 claims description 6
- GFEQMMJEHGAWGE-UHFFFAOYSA-N 4-phenylcyclohexa-1,5-diene-1,4-diamine Chemical group C1=CC(N)=CCC1(N)C1=CC=CC=C1 GFEQMMJEHGAWGE-UHFFFAOYSA-N 0.000 claims description 5
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 claims description 5
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000010907 mechanical stirring Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 238000012958 reprocessing Methods 0.000 claims description 4
- XWVQUJDBOICHGH-UHFFFAOYSA-N dioctyl nonanedioate Chemical compound CCCCCCCCOC(=O)CCCCCCCC(=O)OCCCCCCCC XWVQUJDBOICHGH-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000010618 wire wrap Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000005303 weighing Methods 0.000 description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 12
- 239000012065 filter cake Substances 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 8
- 239000008213 purified water Substances 0.000 description 8
- 238000000967 suction filtration Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 238000007792 addition Methods 0.000 description 5
- 238000004821 distillation Methods 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 239000012074 organic phase Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- QLOAVXSYZAJECW-UHFFFAOYSA-N methane;molecular fluorine Chemical group C.FF QLOAVXSYZAJECW-UHFFFAOYSA-N 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000007112 amidation reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- PEVRKKOYEFPFMN-UHFFFAOYSA-N 1,1,2,3,3,3-hexafluoroprop-1-ene;1,1,2,2-tetrafluoroethene Chemical compound FC(F)=C(F)F.FC(F)=C(F)C(F)(F)F PEVRKKOYEFPFMN-UHFFFAOYSA-N 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- 229920001774 Perfluoroether Polymers 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-N o-dicarboxybenzene Natural products OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- -1 phthalic acid diester Chemical class 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000010129 solution processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/012—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing wire harnesses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/012—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing wire harnesses
- H01B13/01209—Details
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses a preparation method of a composite insulating lapped wire for aviation, and belongs to the technical field of lapped wire processing. The invention is used for solving the technical problems of high density, low mechanical strength and high friction coefficient of wrapping tape and limiting the application of the wrapping tape in the field of aviation in the prior art, and discloses a preparation method of a composite insulating wrapping wire for aviation, which comprises the following steps: adding tetrafluoroethylene, 2-butene-1, 4-diamine, 3-chloropropene, toluene and an initiator into a three-neck flask protected by nitrogen, stirring, heating the three-neck flask to 75-85 ℃, reacting for 6-8h under heat preservation, and performing post treatment to obtain the modified olefin. The invention not only effectively improves the tensile strength and the high temperature resistance of the wrapping belt, but also reduces the self density and the apparent friction coefficient of the wrapping belt, so that the wrapping belt is more suitable for the aviation field.
Description
Technical Field
The invention relates to the technical field of lapped wire processing, in particular to a preparation method of a composite insulated lapped wire for aviation.
Background
In the aerospace field, wire-wrap wires are widely used in aircraft, satellite, and other devices for transmitting power and signals. In avionics equipment where high performance and reliability are required, the insulation of the lapped wire plays a critical role. Compared with the general ground wire, the aviation aerial cable has more practical and special requirements, such as the weight of the insulating material, vacuum air escape, the resistance to atomic oxygen, ultraviolet rays and high-energy radiation, and the flame retardance, mechanical properties and even the technological properties of the insulating material in the production of the cable. For aircraft designers such as helicopters, fighters, large conveyors and large airliners, the primary problem faced is not to reduce the weight of the aircraft itself, but rather for electronic circuit systems weighing hundreds of kilograms in the aircraft and electronic components making up the payload, they must try to reduce their weight.
The wrapping tape prepared from the perfluoroalkoxy resin and the perfluoroethylene propylene copolymer in the prior art has high resistanceExcellent low temperature performance, vacuum gas release performance, ultraviolet radiation resistance, atomic oxygen attack resistance and the like, but the density reaches 2.15-2.20g/cm 3 The density is higher, and because of the softness of the fluorinated carbon chains, the molecular structure of the fluorinated carbon chains is relatively loose, so that the mechanical strength of the material is lower, the surface friction coefficient is higher, and the lapped wire can generate larger friction force when being contacted with other materials, is easy to scratch and wear, is not suitable for being used under the conditions of high load and high friction force, and limits the application of the fluorinated carbon chains in the field of aviation to a certain extent.
In view of the technical drawbacks of this aspect, a solution is now proposed.
Disclosure of Invention
The invention aims to provide a preparation method of a composite insulating lapped wire for aviation, which is used for solving the technical problems that the lapped wire in the prior art has high density, low mechanical strength and high friction coefficient, and is easy to scratch due to the fact that the lapped wire generates larger friction force when being contacted with other materials, and the application of the lapped wire in the field of aviation is limited.
The aim of the invention can be achieved by the following technical scheme:
the preparation method of the composite insulated lapped wire for aviation comprises the following steps:
s1, adding tetrafluoroethylene, 2-butene-1, 4-diamine, 3-chloropropene, toluene and an initiator into a three-neck flask protected by nitrogen, stirring, heating the three-neck flask to 75-85 ℃, reacting for 6-8 hours in a heat preservation way, and performing post treatment to obtain modified olefin;
the synthetic reaction principle of the modified olefin is as follows:
s2, adding the modified diatomite, the modified olefin and the N, N-dimethylformamide into a three-neck flask protected by nitrogen, stirring, raising the temperature of the three-neck flask to 60-70 ℃, slowly dropwise adding dropwise liquid into the three-neck flask, keeping the temperature for reaction for 6-8h after dropwise adding, and performing post-treatment to obtain the composite resin;
the synthetic reaction principle of the composite resin is as follows:
wherein:
and S3, adding the composite resin, the N, N-dimethylformamide and the plasticizer into a beaker, uniformly stirring, standing and defoaming to obtain casting solution, and reprocessing the casting solution after casting to obtain a finished product of the wrapping wire.
Further, in the step S1, the dosage ratio of tetrafluoroethylene, 2-butene-1, 4-diamine, 3-chloropropene, toluene and initiator is 2g to 1g to 4g to 15mL to 0.1g, the initiator is azodiisobutyronitrile, and the post-treatment operation comprises: after the reaction is completed, the temperature of the three-neck flask is reduced to room temperature, purified water is added into the three-neck flask, stirring is carried out for 20-30min, standing and liquid separation are carried out, the organic phase is transferred into a rotary evaporator with the water bath temperature of 90 ℃, and reduced pressure distillation is carried out until no liquid flows out, thus obtaining the modified olefin.
Further, the preparation method of the modified diatomite comprises the following steps: adding diatomite, N-dimethylformamide and hydrochloric acid into a three-neck flask, performing ultrasonic dispersion for 30-50min, fixing the three-neck flask on an iron stand with mechanical stirring, raising the temperature of the three-neck flask to 80-90 ℃, dropwise adding a modifying liquid into the three-neck flask, and performing heat preservation treatment for 5-6h after the dropwise addition is completed, so as to obtain the modified diatomite.
The synthetic reaction principle of the modified diatomite is as follows:
wherein:is diatomite.
Further, the modified liquid consists of p-diaminobiphenyl and N, N-dimethylformamide according to the dosage ratio of 1g to 2mL, the dosage ratio of the diatomite, the N, N-dimethylformamide, the hydrochloric acid and the dropwise adding liquid is 2g to 4mL to 1mL to 6mL, the concentration of the hydrochloric acid is 4-6M, and the post-treatment operation comprises: after the reaction is finished, the temperature of the three-neck flask is reduced to room temperature, suction filtration is carried out, a filter cake is washed by absolute ethyl alcohol for 3 times and then is dried by suction, the filter cake is transferred into a drying box with the temperature of 65-75 ℃ and is dried to constant weight, and the modified diatomite is obtained.
Further, in the step S2, the dropwise adding solution is composed of pyromellitic anhydride and N, N-dimethylformamide according to a dosage ratio of 1g to 2mL, the dosage ratio of the modified diatomite, the modified olefin and the N, N-dimethylformamide to the dropwise adding solution is 1g to 3g to 10mL to 8mL, and the post-treatment operation comprises: after the reaction is finished, adding purified water into a three-neck beaker, stirring for 30-50min, raising the temperature of the three-neck flask to 90-95 ℃, carrying out reduced pressure distillation until no liquid flows out, adding absolute ethyl alcohol into the three-neck flask, carrying out ultrasonic dispersion for 40-60min, carrying out suction filtration, washing a filter cake with the absolute ethyl alcohol, transferring into a drying box with the temperature of 65-75 ℃, and drying to constant weight to obtain the composite resin.
Further, in the step S3, the dosage ratio of the composite resin, the N, N-dimethylformamide and the plasticizer is 5g:8mL:0.2g, wherein the plasticizer is one or more of dioctyl phthalate, dioctyl phthalate and dioctyl azelate.
Further, the casting operation includes: setting the rotating speed of the steel belt to be 0.1m/min, casting the casting solution onto an annular steel belt with a groove for accommodating the casting solution at the top, and sequentially drying and forming the steel belt through a low temperature area and a high temperature area, wherein the temperature of the low temperature area is 140-160 ℃, the length of the low temperature area is 2.0-2.6m, the temperature of the high temperature area is 200-220 ℃, and the length of the high temperature area is 4.2-4.8m.
Further, the reprocessing operation includes: placing the tape-cast lapped wire on a stretcher, setting the stretching multiplying power to be 2-3 times, placing the stretched lapped wire in an oven with the temperature of 350-360 ℃, and carrying out heat preservation treatment for 15-20min to obtain a finished product of the lapped wire.
The invention has the following beneficial effects:
1. in the preparation process of the composite insulated lapped wire for aviation, under the action of a free radical initiator, tetrafluoroethylene, 2-butene-1, 4-diamine and 3-chloropropene undergo free radical polymerization reaction to generate modified olefin; by introducing a large number of fluorocarbon bonds into the modified polyolefin chain segment, the corrosion resistance, the electrical insulation performance and the radiation resistance of the modified olefin are effectively improved, the friction coefficient of the modified olefin is reduced, and the friction resistance of the modified olefin is improved; the amino grafted in the modified olefin effectively improves the reactivity of the modified olefin, and when the lapped wire is prepared, the modified olefin can be crosslinked with other components in the lapped wire, so that the crosslinking degree of the molecular components of the lapped wire is improved, and the strength of the lapped wire is further improved.
2. In the preparation process of the composite insulated wrapping wire for aviation, diatomite is treated in an acidic environment, the surface of the diatomite is acidified to cause the surface of the diatomite to have negative charge, then N, N-dimethylformamide is adsorbed on the diatomite through electrostatic adsorption and the adsorption performance of the diatomite, so that the diatomite is modified, the modified diatomite and modified olefin are subjected to amidation reaction by taking pyromellitic anhydride as a cross-linking agent to generate composite resin with a cross-linking structure, the diatomite and the modified olefin in the composite resin are cross-linked by amide groups, the cross-linking degree of the composite resin is effectively improved, the mechanical performance of the composite resin is improved, the amide bond is a relatively stable covalent bond, generally has higher bonding energy and flexibility, the mechanical strength and the thermal stability of the resin are effectively improved through the typing of the amide bond, and the wrapping wire can keep the structure and the performance under a high-temperature environment.
3. In the preparation process of the composite insulated lapped wire for aviation, molecules or crystal grains in the lapped wire are rearranged in the stretching process, so that the strength and rigidity of the lapped wire are enhanced, the lapped wire is more durable and better in tensile property, after the composite insulated lapped wire is stretched, amidation reaction is carried out on the lapped wire under the action of high temperature to form an amide bond, the molecular structure is changed, so that a molecular chain of a film material is expanded and forms a new structure, the strength and durability of the lapped wire are further effectively improved, the strength and durability of the lapped wire are improved, the lapped wire can bear external stress and environmental influence more, and the amide bond in the film can be more flexible and telescopic due to certain bending property, and the density of the lapped wire can be reduced through the stretching process.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment provides a preparation method of a composite insulated lapped wire for aviation, which comprises the following steps:
s1, preparing modified olefin
Weighing: 40g of tetrafluoroethylene, 20g of 2-butene-1, 4-diamine, 80g of 3-chloropropene, 300mL of toluene and 2g of azodiisobutyronitrile are added into a three-neck flask protected by nitrogen, the temperature of the three-neck flask is increased to 75 ℃, the temperature of the three-neck flask is kept for 6 hours, the temperature of the three-neck flask is reduced to room temperature, 100mL of purified water is added into the three-neck flask, the three-neck flask is stirred for 20 minutes, the mixture is kept stand for liquid separation, an organic phase is transferred into a rotary evaporator with the water bath temperature of 90 ℃, and the mixture is distilled under reduced pressure until no liquid flows out, so that modified olefin is obtained.
S2, preparing modified diatomite
Uniformly mixing p-diaminobiphenyl and N, N-dimethylformamide according to the dosage ratio of 1g to 2mL to obtain a modified liquid;
weighing: adding 20g of diatomite, 80mL of N, N-dimethylformamide and 20mL of 4M hydrochloric acid into a three-neck flask, performing ultrasonic dispersion for 30min, fixing the three-neck flask on an iron stand with mechanical stirring, raising the temperature of the three-neck flask to 80 ℃, dropwise adding 120mL of modified liquid into the three-neck flask, performing heat preservation treatment for 5h after the dropwise adding is completed, reducing the temperature of the three-neck flask to room temperature, performing suction filtration, washing a filter cake with absolute ethyl alcohol for 3 times, performing suction drying, transferring the filter cake into a drying oven with the temperature of 65 ℃, and drying to constant weight to obtain the modified diatomite.
S3, preparing composite resin
Uniformly mixing pyromellitic anhydride and N, N-dimethylformamide according to the dosage ratio of 1g to 2mL to obtain a dripping solution;
weighing: 50g of modified diatomite, 150g of modified olefin and 500mL of N, N-dimethylformamide are added into a three-neck flask protected by nitrogen, the temperature of the three-neck flask is increased to 60 ℃, 400mL of dropwise liquid is slowly added into the three-neck flask, the dropwise addition is completed, the reaction is kept for 6 hours, 100mL of purified water is added into the three-neck flask, the stirring is carried out for 30 minutes, the temperature of the three-neck flask is increased to 90 ℃, the distillation is carried out under reduced pressure until no liquid flows out, 750mL of absolute ethyl alcohol is added into the three-neck flask, the ultrasonic dispersion is carried out for 40 minutes, the suction filtration is carried out, a filter cake is washed by the absolute ethyl alcohol and then is transferred into a drying box with the temperature of 65 ℃, and the drying is carried out until the weight is constant, thus obtaining the composite resin.
S4, preparing a lapped wire
Weighing: 100g of composite resin, 160mL of N, N-dimethylformamide and 4g of dioctyl phthalate are added into a beaker, stirred uniformly, kept stand and defoamed, casting liquid is obtained, the rotating speed of a steel belt is set to be 0.1m/min, casting liquid is cast into a groove at the top of an annular steel belt, the steel belt is sequentially subjected to drying molding through a low-temperature region with the length of 2.0m and the temperature of 140 ℃, then subjected to drying molding through a high-temperature region with the length of 4.2m and the temperature of 200 ℃, the casting molded wrapping wire is placed on a stretcher, stretched to 2 times of the original length at the ambient temperature of 180 ℃, the stretched wrapping wire is placed into an oven with the temperature of 350 ℃, and the heat preservation treatment is carried out for 15-20min, so that a wrapping wire finished product is obtained.
Example 2
The embodiment provides a preparation method of a composite insulated lapped wire for aviation, which comprises the following steps:
s1, preparing modified olefin
Weighing: 40g of tetrafluoroethylene, 20g of 2-butene-1, 4-diamine, 80g of 3-chloropropene, 300mL of toluene and 2g of azodiisobutyronitrile are added into a three-neck flask protected by nitrogen, the temperature of the three-neck flask is increased to 80 ℃, the temperature of the three-neck flask is kept for 7h, the temperature of the three-neck flask is reduced to room temperature, 100mL of purified water is added into the three-neck flask, the three-neck flask is stirred for 25min, the mixture is kept stand for liquid separation, an organic phase is transferred into a rotary evaporator with the water bath temperature of 90 ℃, and the mixture is distilled under reduced pressure until no liquid flows out, thus obtaining the modified olefin.
S2, preparing modified diatomite
Uniformly mixing p-diaminobiphenyl and N, N-dimethylformamide according to the dosage ratio of 1g to 2mL to obtain a modified liquid;
weighing: adding 20g of diatomite, 80mL of N, N-dimethylformamide and 20mL of 5M hydrochloric acid into a three-neck flask, performing ultrasonic dispersion for 40min, fixing the three-neck flask on an iron stand with mechanical stirring, raising the temperature of the three-neck flask to 85 ℃, dropwise adding 120mL of modified liquid into the three-neck flask, performing heat preservation treatment for 5.5h after the dropwise adding is finished, reducing the temperature of the three-neck flask to room temperature, performing suction filtration, washing a filter cake with absolute ethyl alcohol for 3 times, performing suction drying, transferring the filter cake into a drying oven with the temperature of 70 ℃, and drying to constant weight to obtain the modified diatomite.
S3, preparing composite resin
Uniformly mixing pyromellitic anhydride and N, N-dimethylformamide according to the dosage ratio of 1g to 2mL to obtain a dripping solution;
weighing: 50g of modified diatomite, 150g of modified olefin and 500mL of N, N-dimethylformamide are added into a three-neck flask protected by nitrogen, the temperature of the three-neck flask is increased to 65 ℃, 400mL of dropwise liquid is slowly added into the three-neck flask, the dropwise addition is completed, the reaction is kept for 7h, 100mL of purified water is added into the three-neck flask, the stirring is carried out for 40min, the temperature of the three-neck flask is increased to 93 ℃, the distillation is carried out under reduced pressure until no liquid flows out, 750mL of absolute ethyl alcohol is added into the three-neck flask, the ultrasonic dispersion is carried out for 50min, the suction filtration is carried out, a filter cake is washed by absolute ethyl alcohol and then is transferred into a drying box with the temperature of 70 ℃, and the drying is carried out until the weight is constant, thus obtaining the composite resin.
S4, preparing a lapped wire
Weighing: adding 100g of composite resin, 160mL of N, N-dimethylformamide and 4g of phthalic acid diester into a beaker, stirring uniformly, standing for defoaming to obtain casting liquid, setting the rotating speed of a steel belt to be 0.1m/min, casting the casting liquid into a groove at the top of an annular steel belt, sequentially passing the steel belt through a low-temperature region with the length of 2.0-2.6m and the temperature of 150 ℃, then drying and forming the steel belt through a high-temperature region with the length of 4.5m and the temperature of 210 ℃, placing the casting formed wrapping wire on a stretcher, stretching the stretched wrapping wire to 2.5 times of the original length at the environmental temperature of 185 ℃, placing the stretched wrapping wire into an oven with the temperature of 355 ℃, and carrying out heat preservation treatment for 18min to obtain a finished product of the wrapping wire.
Example 3
The embodiment provides a preparation method of a composite insulated lapped wire for aviation, which comprises the following steps:
s1, preparing modified olefin
Weighing: 40g of tetrafluoroethylene, 20g of 2-butene-1, 4-diamine, 80g of 3-chloropropene, 300mL of toluene and 2g of azodiisobutyronitrile are added into a three-neck flask protected by nitrogen, the temperature of the three-neck flask is increased to 85 ℃, the reaction is carried out for 8 hours in a heat preservation way, the temperature of the three-neck flask is reduced to room temperature, 100mL of purified water is added into the three-neck flask, the three-neck flask is stirred for 30 minutes, the mixture is kept stand for liquid separation, an organic phase is transferred into a rotary evaporator with the water bath temperature of 90 ℃, and the mixture is distilled under reduced pressure until no liquid flows out, thus obtaining the modified olefin.
S2, preparing modified diatomite
Uniformly mixing p-diaminobiphenyl and N, N-dimethylformamide according to the dosage ratio of 1g to 2mL to obtain a modified liquid;
weighing: adding 20g of diatomite, 80mL of N, N-dimethylformamide and 20mL of 6M hydrochloric acid into a three-neck flask, performing ultrasonic dispersion for 50min, fixing the three-neck flask on an iron stand with mechanical stirring, raising the temperature of the three-neck flask to 80-90 ℃, dropwise adding 120mL of modified liquid into the three-neck flask, performing heat preservation treatment for 6h after the dropwise adding is finished, reducing the temperature of the three-neck flask to room temperature, performing suction filtration, washing a filter cake with absolute ethyl alcohol for 3 times, performing suction drying, transferring the filter cake into a drying oven with the temperature of 75 ℃, and drying to constant weight to obtain the modified diatomite.
S3, preparing composite resin
Uniformly mixing pyromellitic anhydride and N, N-dimethylformamide according to the dosage ratio of 1g to 2mL to obtain a dripping solution;
weighing: 50g of modified diatomite, 150g of modified olefin and 500mL of N, N-dimethylformamide are added into a three-neck flask protected by nitrogen, the temperature of the three-neck flask is increased to 70 ℃, 400mL of dropwise liquid is slowly added into the three-neck flask, the dropwise addition is completed, the reaction is kept for 8 hours, 100mL of purified water is added into the three-neck flask, the stirring is carried out for 50 minutes, the temperature of the three-neck flask is increased to 95 ℃, the distillation is carried out under reduced pressure until no liquid flows out, 750mL of absolute ethyl alcohol is added into the three-neck flask, the ultrasonic dispersion is carried out for 60 minutes, the suction filtration is carried out, a filter cake is washed by absolute ethyl alcohol and then is transferred into a drying box with the temperature of 75 ℃, and the drying is carried out until the weight is constant, thus obtaining the composite resin.
S4, preparing a lapped wire
Weighing: 100g of composite resin, 160mL of N, N-dimethylformamide and 4g of dioctyl azelate are added into a beaker, stirred uniformly, kept stand and defoamed, casting solution is obtained, the rotating speed of a steel belt is set to be 0.1m/min, casting solution is cast into a groove at the top of an annular steel belt, the steel belt is sequentially subjected to drying molding through a low-temperature region with the length of 2.6m and the temperature of 160 ℃ and a high-temperature region with the length of 4.8m and the temperature of 220 ℃, a casting molded wrapping wire is placed on a stretcher, the stretched wrapping wire is stretched to 3 times of the original length at the environmental temperature of 190 ℃, the stretched wrapping wire is placed into an oven with the temperature of 360 ℃, and the heat preservation treatment is carried out for 20min, so that a finished product of the wrapping wire is obtained.
Comparative example 1
The difference between this comparative example and example 1 is that 2-butene-1, 4-diamine was not added in step S1.
Comparative example 2
The present comparative example is different from example 1 in that step S2 is omitted and the modified diatomaceous earth in step S3 is replaced with diatomaceous earth in equal amount.
Comparative example 3
The present comparative example is different from example 1 in that the stretching operation in step S4 is canceled and the wrapping tape after the dry molding is not stretched.
Performance test:
the density, high temperature resistance and strength of the finished products of the lapped wire prepared in examples 1 to 3 and comparative examples 1 to 3 were tested, wherein the density was measured according to the standard GB/T20022-2005 "determination of apparent Density of homo-and copolymer resin of Plastic vinyl chloride"; determination of tensile Properties of Plastic according to Standard GB/T1040.1-2018 part 1: the general rule is that the tensile strength and tensile fracture strain of a sample are measured, and the friction coefficient of the sample is measured by referring to the standard GB/T3960-2016 plastic sliding friction and abrasion test method; the high temperature resistance was measured for the dimensional change rate of the test sample by reference to standard GB/T12027-2004 "Plastic-film and sheet-heating dimensional change Rate test method", and specific test results are shown in the following Table:
data analysis:
as can be seen from the data analysis in the above table, the density of the lapped wire prepared by the invention is reduced to 1.28g/cm 3 The tensile strength reaches 36.0MPa, the tensile fracture strain reaches 125.2%, the friction coefficient is reduced to 0.10, the dimensional change rate is reduced to 2.2, and all detection data are superior to those of the wrapping tape prepared in comparative examples 1-3, so that the wrapping tape prepared by the invention has the advantages of low density, high strength, good friction resistance and good high temperature resistance.
The foregoing is merely illustrative and explanatory of the invention, as it is well within the scope of the invention as claimed, as it relates to various modifications, additions and substitutions for those skilled in the art, without departing from the inventive concept and without departing from the scope of the invention as defined in the accompanying claims.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (4)
1. The preparation method of the composite insulated lapped wire for aviation is characterized by comprising the following steps of:
s1, adding tetrafluoroethylene, 2-butene-1, 4-diamine, 3-chloropropene, toluene and an initiator into a three-neck flask protected by nitrogen, stirring, heating the three-neck flask to 75-85 ℃, reacting for 6-8 hours in a heat preservation way, and performing post treatment to obtain modified olefin;
s2, adding the modified diatomite, the modified olefin and the N, N-dimethylformamide into a three-neck flask protected by nitrogen, stirring, raising the temperature of the three-neck flask to 60-70 ℃, slowly dropwise adding dropwise liquid into the three-neck flask, keeping the temperature for reaction for 6-8h after dropwise adding, and performing post-treatment to obtain the composite resin;
s3, adding the composite resin, N-dimethylformamide and a plasticizer into a beaker, uniformly stirring, standing and defoaming to obtain casting solution, and carrying out casting and reprocessing on the casting solution to obtain a wrapping wire finished product;
the preparation method of the modified diatomite comprises the following steps: adding diatomite, N-dimethylformamide and hydrochloric acid into a three-neck flask, performing ultrasonic dispersion for 30-50min, fixing the three-neck flask on an iron stand with mechanical stirring, raising the temperature of the three-neck flask to 80-90 ℃, dropwise adding a modifying liquid into the three-neck flask, and performing heat preservation treatment for 5-6h after the dropwise addition is completed, so as to obtain modified diatomite;
the modified liquid consists of p-diaminobiphenyl and N, N-dimethylformamide according to the dosage ratio of 1g to 2mL, the dosage ratio of the diatomite, the N, N-dimethylformamide, the hydrochloric acid and the dropping liquid is 2g to 4mL to 1mL to 6mL, and the concentration of the hydrochloric acid is 4-6M;
in the step S2, the dropwise adding liquid consists of pyromellitic anhydride and N, N-dimethylformamide according to the dosage ratio of 1g to 2mL, wherein the dosage ratio of the modified diatomite, the modified olefin and the N, N-dimethylformamide to the dropwise adding liquid is 1g to 3g to 10mL to 8mL;
the reprocessing operation includes: placing the tape-cast lapped wire on a stretcher, setting the stretching multiplying power to be 2-3 times, placing the stretched lapped wire in an oven with the temperature of 350-360 ℃, and carrying out heat preservation treatment for 15-20min to obtain a finished product of the lapped wire.
2. The method for preparing the composite insulated wire wrap for aviation according to claim 1, wherein in the step S1, the dosage ratio of tetrafluoroethylene, 2-butene-1, 4-diamine, 3-chloropropene, toluene and initiator is 2g:1g:4g:15mL:0.1g, and the initiator is azobisisobutyronitrile.
3. The method for preparing the composite insulated wire for aviation according to claim 1, wherein in the step S3, the dosage ratio of the composite resin, the N, N-dimethylformamide and the plasticizer is 5g:8mL:0.2g, wherein the plasticizer is one or more of dioctyl phthalate, dioctyl phthalate and dioctyl azelate.
4. The method for producing an aircraft composite insulated lapped wire according to claim 1, wherein the casting operation comprises: setting the rotating speed of the steel belt to be 0.1m/min, casting the casting solution onto an annular steel belt with a groove for accommodating the casting solution at the top, and sequentially drying and forming the steel belt through a low temperature area and a high temperature area, wherein the temperature of the low temperature area is 140-160 ℃, the length of the low temperature area is 2.0-2.6m, the temperature of the high temperature area is 200-220 ℃, and the length of the high temperature area is 4.2-4.8m.
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