Aviation cable over-frame protection material, preparation method and aviation cable over-frame protection strip

Abstract

The invention discloses an aviation cable over-frame protection material, a preparation method and an aviation cable over-frame protection strip. According to the aviation cable over-frame protection material provided by the invention, the aviation cable over-frame protection material with a customized thickness is adhered to a cable over-frame position, so that the cable and a machine body structure are protected. According to the over-frame protection material for the aviation cable, the modified expanded polytetrafluoroethylene with an extremely small friction coefficient is selected as the base material layer, and the material is soft, can protect an airframe structure and the cable, is low in density and light in weight, and can greatly reduce the weight of an airplane. Compared with a traditional aviation cable over-frame protection material, the aviation cable over-frame protection material provided by the invention is also provided with the adhesive layer, so that the aviation cable over-frame protection material is convenient to use, non-toxic and harmless; customization can be carried out according to on-site working conditions, and installation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aviation cable frame protection materials, and in particular to aviation cable frame protection materials, a preparation method and aviation cable frame protection tapes. Background Art

[0002] In the aviation field, cable protection is crucial because the integrity and stability of cables are directly related to the safe operation of aircraft. At present, aviation cables are easily damaged by wear or impact when passing through the fuselage frame during installation or aircraft flight. Although the existing traditional protective materials can play a certain protective role, they still need to be improved in terms of installation efficiency, wear resistance, high temperature resistance, aging resistance, medium resistance, maintenance and other aspects. For example, there are deficiencies in the convenience of installation and replacement: it is necessary to apply DG-3 adhesive (AdhesiveDG-3) to adhere to the mouth frame, which has many disadvantages: long vulcanization time (≥24h in summer, ≥48h in winter), inconvenient installation, high density increases the weight of the aircraft, and the material itself is toxic and harmful to the installation workers. And it is impossible to replace the corresponding specifications according to the thickness of the fuselage structure, and the installation and replacement operations are complicated, which cannot meet the needs of efficient maintenance in the aviation field. In addition, the material of traditional soluble polytetrafluoroethylene (PFA, Perfluoroalkoxy) is relatively hard, and it is easy to warp and break during use, which increases the damage to the cable. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide an aviation cable frame protection material, a preparation method and an aviation cable frame protection tape.

[0004] The present invention solves the technical problem by adopting the following technical solutions.

[0005] The invention provides an aviation cable frame protection material, comprising a substrate layer, an adhesive layer and a release film layer which are stacked in sequence, wherein the substrate layer is made of modified expanded polytetrafluoroethylene, and the adhesive layer is made of modified medium-resistant enhanced pressure-sensitive adhesive.

[0006] The present invention provides a method for preparing the above-mentioned aviation cable frame protection material, which comprises: using modified expanded polytetrafluoroethylene as a base layer, then using a modified medium-resistant enhanced pressure-sensitive adhesive as an adhesive layer and coating it on the base layer, curing and forming at 70±5°C, and then laminating the coated adhesive layer with a release film layer to obtain the aviation cable frame protection material.

[0007] The invention provides a cable frame protection tape for aviation use. The middle of the cable frame protection tape is a mouth frame pasting positioning area, and the two sides are fixing areas for pasting on the two sides of the mouth frame.

[0008] The present invention has the following beneficial effects: The present invention provides a cable frame protection material for aviation, a preparation method and a cable frame protection tape for aviation. The cable frame protection material for aviation provided by the present invention comprises a substrate layer, an adhesive layer and a release film layer which are sequentially stacked, the substrate layer is made of modified expanded polytetrafluoroethylene, and the adhesive layer is made of modified medium-resistant enhanced pressure-sensitive adhesive. The above-mentioned cable frame protection material for aviation adopts modified expanded polytetrafluoroethylene with a very small friction coefficient as the substrate layer. The material itself is relatively soft and can protect the body structure and cables; and the material has low density and light weight, which can greatly reduce the weight of the aircraft; and the above-mentioned cable frame protection material for aviation comes with a medium-resistant backing adhesive, which is convenient to use and non-toxic and harmless. The cable and body structure are protected by pasting the cable frame protection material for aviation with customized thickness at the cable frame. It can also be customized according to the on-site working conditions to improve the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 This is a schematic diagram of the appearance of traditional aviation cable frame protection materials; Figure 2 This is a schematic diagram of the discoloration of traditional aviation cable frame protection materials after use; Figure 3 A schematic diagram of the composition of the aviation cable frame protection material provided by an embodiment of the present invention; Figure 4 A schematic diagram of the structure of a cable frame protection tape for aviation provided in an embodiment of the present invention; Figure 5 A schematic diagram of the appearance of a cable frame protection tape for aviation provided by an embodiment of the present invention; Figure 6 A schematic diagram of the installation of the aviation cable frame protection tape provided in an embodiment of the present invention to the frame structure, wherein: L1-depth of the fan-shaped structure, L2-centerline width, L3-width of the fan-shaped structure, L-length of the aviation cable frame protection tape, D-thickness of the aviation cable frame protection tape. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0012] The following is a detailed description of an aviation cable frame protection material, a preparation method, and an aviation cable frame protection tape provided in an embodiment of the present invention.

[0013] An embodiment of the present invention provides an aviation cable frame protection material, comprising a substrate layer, an adhesive layer and a release film layer stacked in sequence, wherein the substrate layer is made of modified expanded polytetrafluoroethylene, and the adhesive layer is made of modified medium-resistant enhanced pressure-sensitive adhesive.

[0014] See the schematic diagram of the appearance of traditional aviation cable frame protection materials. Figure 1 The installation sequence for pasting it on the mouth frame of the machine body is as follows: wipe and clean the structure mouth frame (5 minutes), fully mix the A and B components of DG-3 adhesive according to the specified ratio (30 minutes), apply the mixed adhesive with a glue gun or other suitable tools (30 minutes), use Figure 1 The traditional aviation cable frame protection material shown in the figure is pasted (20 minutes), then fixed with auxiliary clamps (10 minutes), and the DG-3 adhesive is cured at room temperature (1440 minutes). It takes about 1630 minutes for the traditional aviation cable frame protection material to complete a 10*10cm rectangular frame. It can be seen that in the process of pasting the traditional aviation cable frame protection material to the fuselage frame structure, there are many problems that affect the installation efficiency, such as the difficulty of fixing it to the frame structure without adhesive backing, and the DG-3 adhesive is in liquid form before vulcanization, and it needs to be fixed with fixing clamps in the early stage to assist vulcanization. In addition, the traditional aviation cable frame protection material will seriously discolor after a period of use. See Figure 2 .

[0015] It can be seen that the traditional aviation cable frame protection material uses DG-3 adhesive to stick soluble polytetrafluoroethylene on the frame structure of the body. The soluble polytetrafluoroethylene as the base material layer has a hard material, which increases the risk of cable damage after the interface is damaged, and has a high density (2.16g / cm 3 ) Increase the weight of the aircraft and other defects. In the process of bonding using DG-3 adhesive, the A and B components of DG-3 adhesive need to be fully mixed in the prescribed ratio, and the mixed adhesive is applied using a glue gun or other suitable tools. This has the defects of cumbersome gluing steps, weak bonding, and long time consumption.

[0016] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides an aviation cable frame protection material, comprising a substrate layer, an adhesive layer and a release film layer stacked in sequence, wherein the substrate layer is made of modified expanded polytetrafluoroethylene, and the adhesive layer is made of modified medium-resistant enhanced pressure-sensitive adhesive. Prepare modified expanded polytetrafluoroethylene and use it as the substrate layer: The aviation cable frame protection material provided by the embodiment of the present invention is prepared by the following method: 25wt%~30wt% of pentafluorobenzyl acrylate, 15wt%~20wt% of silicone copolymer, 2wt%~5wt% of graphene, 2wt%~5wt% of molybdenum disulfide and 40wt%~55wt% of polytetrafluoroethylene dispersion resin are mixed, and then the mixture is subjected to aging, molding, extrusion calendering, degreasing, stretching and then sintering.

[0017] The modified expanded polytetrafluoroethylene prepared above introduces perfluoroalkyl side chains on the modified expanded polytetrafluoroethylene polymer chain. These side chains can significantly change the surface properties of expanded polytetrafluoroethylene due to their high hydrophobicity and chemical inertness, such as improving its hydrophobicity, reducing surface energy and improving oil resistance; at the same time, the organic silicon group introduced by the organic silicon copolymer can improve the bonding performance of the material and provide a certain degree of temperature resistance and chemical resistance; and after the introduction of graphene and molybdenum disulfide, the surface properties of the material are improved by physical means, and a lubricating interface is formed on the surface of the material, thereby improving the wear resistance of the material and reducing the friction coefficient. After testing, the above-mentioned substrate layer prepared by the scheme provided by the embodiment of the present invention has low friction coefficient, wear resistance (wear mass ≤ 0.002g), high and low temperature resistance (temperature resistance range is -260℃~280℃), resistance to any strong acid and alkali and organic solvents (aviation fuel, hydraulic oil, lubricating oil and other media do not invade), low density (0.4g / cm 3 ~0.9g / cm 3 ), high tensile strength (20MPa~40MPa) and other excellent properties.

[0018] It is worth noting that in order to further improve the oil resistance of modified expanded polytetrafluoroethylene, the solution provided in the embodiment of the present invention screens the optimal raw material dosage for preparing modified expanded polytetrafluoroethylene through aviation kerosene immersion experiment, so as to obtain the best high-strength medium-resistant expanded polytetrafluoroethylene material. The prepared modified expanded polytetrafluoroethylene has a standard tensile strength of ≥9MPa before compression; after compression, after being immersed in YH-15 hydraulic oil, lubricating oil, fuel oil, acetone, 65# coolant, 180# cleaning gasoline and other media at 50°C for 1h, its tensile strength is 20MPa~40MPa.

[0019] In addition, the above-mentioned modified expanded polytetrafluoroethylene has good chemical stability and low surface energy, which makes it have super hydrophobic characteristics. But in order to improve the bonding performance on its surface or the compatibility with other materials, it is usually necessary to modify its surface. The surface modification method of plasma treatment or corona treatment can be used, it can form active groups on expanded polytetrafluoroethylene (e-PTFE, expandedPTFE) surface, improve surface energy, thereby improve its bonding performance with other materials, and chemical corrosion modification can also be used in addition to optimize the surface activity of modified expanded polytetrafluoroethylene, thereby enhance its bonding effect with adhesive layer. By the above modification method, the surface properties of modified expanded polytetrafluoroethylene are adjusted, to promote the bonding force between modified medium-resistant enhanced pressure-sensitive adhesive, i.e., back glue and it, not only can improve bonding strength, but also improve wetting properties, so that adhesive layer is better attached to the substrate layer surface.

[0020] Prepare a modified medium-resistant enhanced pressure-sensitive adhesive and use it as an adhesive layer: The aviation cable frame protection material provided by the embodiment of the present invention uses polyurethane polymer as the main component of the pressure-sensitive adhesive, which has low toxicity, good biocompatibility and solvent resistance. Specifically: 15%~25wt% of γ-aminopropyl triethoxysilane coupling agent (KH-550), 57%~65wt% of polyether polyurethane, 5%~10wt% of titanate and 7%~13wt% of silicone additive are mixed and reacted to obtain a modified medium-resistant enhanced pressure-sensitive adhesive. Among them, KH-550 is an important type of surface treatment agent. KH-550 can form chemical bonds on the surface of inorganic materials, and react or be compatible with organic polymer materials at the same time, thereby improving the performance of composite materials. The KH-550 selected in the present invention has high reactivity and is often used to improve the adhesion and mechanical properties of materials. Polyether polyurethane is a multifunctional engineering material, which is formed by the reaction of polyether polyols and polyisocyanates, and has high wear resistance, tensile strength and aging resistance. Phthalate esters (Phthalates) are a class of widely used chemical products, mainly used as plasticizers to increase the softness and flexibility of plastics. Dimethyl phthalate can be used in the production of polymers and plasticizing solvents. Silicone additives have good corrosion resistance and can be added to materials as additives to increase the corrosion resistance of materials. In summary, by selecting specific functional monomers and preparing modified medium-resistant enhanced pressure-sensitive adhesives with scientific proportions, the adhesion and weather resistance of the modified medium-resistant enhanced pressure-sensitive adhesives to the substrate layer can be enhanced, and the peel strength and solvent resistance of the modified medium-resistant enhanced pressure-sensitive adhesives can be improved. The modified medium-resistant enhanced pressure-sensitive adhesive is immersed in YH-15 hydraulic oil, 4109 lubricating oil, RP-3 fuel, acetone, 65 liquid coolant, No. 180 cleaning gasoline, water and other media at 50°C for 1h, and its peel strength is 0.2kN / m-2.0kN / m.

[0021] Through the above ingredient screening and formula adjustment, the modified medium-resistant enhanced pressure-sensitive adhesive has its adhesive performance increased while improving its medium resistance. The prepared modified medium-resistant enhanced pressure-sensitive adhesive has a low initial peel strength, which is convenient for positioning and adjustment during the installation process. After the modified medium-resistant enhanced pressure-sensitive adhesive is pasted for a long time, its internal polymer chains are further cross-linked or reorganized, thereby improving cohesion and bonding strength. And after being soaked in aviation media, it can ensure that the aviation cable frame protection material still has a good bonding effect after encountering medium erosion such as "leakage".

[0022] Preparation of aviation cable frame protection materials: The modified expanded polytetrafluoroethylene is used as the base layer, and then the modified medium-resistant enhanced pressure-sensitive adhesive is used as the adhesive layer and coated on the base layer, and cured at 70±5°C, and then the coated adhesive layer is laminated with the release film layer to obtain the aviation cable frame protection material. Among them: the thickness of the base layer is 0.8mm~0.9mm, the thickness of the adhesive layer is 0.05mm~0.1mm, and the thickness of the release film layer is 0.01mm~0.03mm.

[0023] Preparation of aviation cable frame protection tape: An embodiment of the present invention also provides an aviation cable frame protection strip, which is cut by a cutting knife to obtain the aviation cable frame protection material. The tool material is diamond with a hardness of HRA90, and the cutting speed range is maintained at 50~200m / min to avoid material tearing or deformation during the cutting process.

[0024] See also Figure 4 and Figure 5 The middle of the aviation cable frame protection tape is the frame pasting positioning area (L2), and the two sides are the fixing areas (L1 and L3) for pasting on the two sides of the frame. Among them: the width of the frame pasting positioning area in the middle of the aviation cable frame protection tape is the frame thickness, and the two sides of the fixing areas for pasting on the two sides of the frame are "sunflower" fan-shaped structures.

[0025] The above-mentioned aviation cable frame protection material adopts the design form of strip material, and one roll of strip material can correspond to multiple opening frames, saving installation costs and improving installation efficiency. However, the traditional aviation cable frame protection material is a standard part, and each opening frame needs to correspond to each material one by one. In the case of complex on-site installation system and numerous opening covers, it takes a huge amount of time to check the correspondence between the traditional aviation cable frame protection material and the opening cover, which greatly increases the workload of on-site construction.

[0026] The present invention will be further described below in conjunction with the embodiments.

[0027] The test methods for various properties of aviation cable frame protection materials in the following embodiments and comparative examples are as follows: Take aviation cable frame protection materials and test them according to GB / T1033.1-2008 Method A. The sample size is (30±1)mm×(20±1)mm, and the arithmetic mean of 5 samples is taken as the density test result.

[0028] Take aviation cable frame protection material and prepare three specimens with reference to GB / T3960-2016. The specimen size is (30*7*6) mm. The test ring rotates at 200 r / min. The test time is 2 h and the load is 196 N. The arithmetic mean of the three specimens is taken as the wear quality test result.

[0029] Take the aviation cable frame protection material, cut the specimens according to Section 5.6.4.1 of GJB8272-2014, and compress the material according to the method specified in Section 4.5.5.21. Center the compressed specimen between the fixtures and tighten it with M6 bolts with a torque of 3.4 N·m. Completely immerse the fixture with the specimen in a container filled with the medium, put the container with the specimen in an environment of 50°C for 1 hour and take it out. After the fixture with the specimen is immersed in three kinds of media, namely aviation fuel, hydraulic oil and lubricating oil, the oil stains on the surface of the specimen are wiped off with oil-absorbing paper after the fixture is disassembled, and the tensile strength is tested according to Section 5.6.4.1.

[0030] Take the aviation cable frame protection material and perform the adhesive peeling strength test according to GB / T2792-2014. The sample size is (300±1)mm×(24+0.5)mm. The sample is pasted on the middle of the stainless steel plate. The size of the stainless steel plate is (150+1)mm×(75+1)mm×(1±0.15)mm. After balancing for 2h, test the 180° peeling strength value.

[0031] Example 1 A cable frame protection material for aviation, see Figure 3, including a substrate layer, an adhesive layer and a release film layer which are stacked in sequence, the substrate layer is made of modified expanded polytetrafluoroethylene, the adhesive layer is made of modified medium-resistant enhanced pressure-sensitive adhesive, and the preparation method of the modified expanded polytetrafluoroethylene is as follows: 25wt% of pentafluorobenzyl acrylate, 15wt% of silicone copolymer, 2wt% of graphene, and 3wt% of molybdenum disulfide are mixed, and then mixed with 55wt% of polytetrafluoroethylene dispersion resin, and then sintered at 200°C after aging, compression molding, extrusion calendering, degreasing, and stretching to form the final modified expanded polytetrafluoroethylene. The preparation method of the modified medium-resistant enhanced pressure-sensitive adhesive is as follows: after the surface of the modified expanded polytetrafluoroethylene is corona treated, 25wt% of γ-aminopropyltriethoxysilane coupling agent (KH-550), 60wt% of polyether polyurethane, 5wt% of dimethyl phthalate and 10wt% of silicone additive are mixed, and then applied to the modified expanded polytetrafluoroethylene, and then formed after high-temperature curing at 70°C.

[0032] The prepared product was tested: its average density was 0.86 g / cm 3 The measured average value of wear mass is 0.001g, the measured average value of tensile strength after medium immersion is 25Mpa, and the measured average value of peel strength of adhesive layer is 0.5kN / m.

[0033] Example 2 A cable frame protection material for aviation, see Figure 3 , including a substrate layer, an adhesive layer and a release film layer which are stacked in sequence, the substrate layer is made of modified expanded polytetrafluoroethylene, the adhesive layer is made of modified medium-resistant enhanced pressure-sensitive adhesive, and the preparation method of the modified expanded polytetrafluoroethylene is as follows: 28wt% of pentafluorobenzyl acrylate, 18wt% of silicone copolymer, 4wt% of graphene, and 4wt% of molybdenum disulfide are mixed, and then mixed with 46wt% of polytetrafluoroethylene dispersion resin, and then sintered at 200°C after aging, compression molding, extrusion calendering, degreasing, and stretching to form the final modified expanded polytetrafluoroethylene. The preparation method of the modified medium-resistant enhanced pressure-sensitive adhesive is as follows: after the surface of the modified expanded polytetrafluoroethylene is corona treated, 18wt% of γ-aminopropyltriethoxysilane coupling agent (KH-550), 65wt% of polyether polyurethane, 7wt% of dimethyl phthalate and 10wt% of silicone additive are mixed, and then applied to the modified expanded polytetrafluoroethylene, and then formed after high-temperature curing at 70°C.

[0034] The prepared product was tested and the average density was 0.89 g / cm 3 The measured average value of wear mass is 0.001g, the measured average value of tensile strength after medium immersion is 23Mpa, and the measured average value of adhesive layer peeling strength is 0.52kN / m.

[0035] Example 3 A cable frame protection material for aviation, see Figure 3 , including a substrate layer, an adhesive layer and a release film layer stacked in sequence, the substrate layer is made of modified expanded polytetrafluoroethylene, the adhesive layer is made of modified medium-resistant enhanced pressure-sensitive adhesive, and the preparation method of the modified expanded polytetrafluoroethylene is as follows: 30wt% of pentafluorobenzyl acrylate, 20wt% of silicone copolymer, 5wt% of graphene, and 4wt% of molybdenum disulfide are mixed, and then mixed with 41wt% of polytetrafluoroethylene dispersion resin, and then sintered at 200°C after aging, molding, extrusion calendering, degreasing, and stretching to form the final modified expanded polytetrafluoroethylene. The preparation method of the modified medium-resistant enhanced pressure-sensitive adhesive is as follows: after the surface of the modified expanded polytetrafluoroethylene is corona treated, 20wt% of γ-aminopropyltriethoxysilane coupling agent (KH-550), 57wt% of polyether polyurethane, 10wt% of dimethyl phthalate and 13wt% of silicone additive are mixed, and then applied to the modified expanded polytetrafluoroethylene, and then formed after high-temperature curing at 70°C.

[0036] The prepared product was tested and the average density was 0.85g / cm 3 The measured average value of wear mass is 0.001g, the measured average value of tensile strength after medium immersion is 23Mpa, and the measured average value of adhesive layer peeling strength is 0.49kN / m.

[0037] Comparative Example 1 The steps are basically similar to those in Example 1, except that: the preparation method of the modified expanded polytetrafluoroethylene is: 35wt% of pentafluorobenzyl acrylate, 25wt% of silicone copolymer, 0wt% of graphene, and 0wt% of molybdenum disulfide are mixed, and then 40wt% of polytetrafluoroethylene dispersed resin is added, and the other conditions remain unchanged according to Example 1.

[0038] The prepared product was tested and the average density was 1.28 g / cm 3 The average wear mass is 0.05g. No filler is added in the preparation process of modified expanded polytetrafluoroethylene, and its wear performance is reduced. And its density exceeds the density requirement of aviation materials (0.4g / cm 3 ~1.2g / cm 3 ,>1.2g / cm 3 Overweight material).

[0039] Comparative Example 2 The steps are basically similar to those in Example 1, except that: the preparation method of the modified medium-resistant enhanced pressure-sensitive adhesive is as follows: corona treatment is performed on the surface of the modified expanded polytetrafluoroethylene, and then 10wt% of γ-aminopropyltriethoxysilane coupling agent (KH-550), 70wt% of polyether polyurethane, 15wt% of dimethyl phthalate and 5wt% of silicone additive are mixed and then coated on the modified expanded polytetrafluoroethylene after post-treatment, and the other conditions remain unchanged, and the mixture is formed after high-temperature curing at 70°C.

[0040] The prepared product was tested. After being immersed in aviation fuel, hydraulic oil, lubricating oil and other media at 50°C for 1 hour, the measured average tensile strength was 22Mpa and the peel strength test value was 0.15kN / m. The bonding force between the modified medium-resistant enhanced pressure-sensitive adhesive and the substrate layer was greatly reduced, indicating that γ-aminopropyltriethoxysilane coupling agent (KH-550) can affect the bonding force of the adhesive layer. Reducing the amount of γ-aminopropyltriethoxysilane coupling agent (KH-550) used in the preparation process of the modified medium-resistant enhanced pressure-sensitive adhesive will greatly reduce the bonding force between the modified medium-resistant enhanced pressure-sensitive adhesive and the substrate layer.

[0041] Comparative Example 3 The steps are basically similar to those in Example 1, except that 45-60wt% of γ-aminopropyltriethoxysilane coupling agent (KH-550), 25-40wt% of polyether polyurethane, 5wt% of dimethyl phthalate and 10wt% of silicone additive are mixed and coated on the substrate layer, and the other conditions remain unchanged.

[0042] The prepared samples were tested and placed in an oven at 120°C for 28 days. The adhesive layer on the surface of the substrate layer peeled and cracked. However, the samples prepared by the method in Example 1 did not show any abnormalities such as peeling and cracking on the adhesive layer under the same treatment conditions, indicating that polyether polyurethane can affect the aging life of the adhesive layer of the material. Reducing the amount of polyether polyurethane used in the preparation process of the modified medium-resistant enhanced pressure-sensitive adhesive will cause abnormalities after the modified medium-resistant enhanced pressure-sensitive adhesive is combined with the substrate layer, which is not conducive to long-term use.

[0043] Application Examples An aviation cable frame protection tape is cut into aviation cable frame protection tapes from aviation cable frame protection materials. The aviation cable frame protection tape has a thickness of D and a length of L. The aviation cable frame protection tape has a "sunflower" design, double protection and fixation, ensuring that the cables and the body structure are fully protected. Figure 4 and Figure 5 The aviation cable frame protection tape is divided into three parts, such as Figure 4As shown, the middle is the mouth frame pasting positioning area (the centerline width of the positioning area is L2), which is mainly determined by the mouth frame thickness. The two sides are "sunflower" type fan-shaped structures, which are fixed areas (the depth of the fan-shaped structure is L1 and the width is L3), pasted on both sides of the mouth frame to ensure that the aviation cable frame protection material is fully pasted on the mouth frame structure, while reducing the wear of the cables on both sides.

[0044] The installation sequence of aviation cable frame protection materials is as follows: wipe and clean the structure frame (5 minutes), tear off the middle release film to start positioning and pasting (5 minutes), tear off the release films on both sides to fix (5 minutes). It takes at most 15 minutes to complete a rectangular frame of 10*10cm in size. The schematic diagram after the aviation cable frame protection materials are installed to the frame is as follows Figure 6 As shown, compared with traditional aviation cable frame protection materials, aviation cable frame protection materials have a higher degree of fit with the frame, are more stable and beautiful. In addition, the above-mentioned aviation cable frame protection materials are customized coils that can be pasted at any time, greatly improving assembly efficiency.

[0045] From the above, it can be seen that an embodiment of the present invention provides an aviation cable frame protection material. By using modified expanded polytetrafluoroethylene as the main body of the aviation cable frame protection material, the flexibility and wear resistance of the main body are improved, so that the aviation cable frame protection material can still maintain good protection performance in complex environments. By applying an adhesive layer, a release film layer, and a strip that can be cut to any length on the back of the aviation cable frame protection material, rapid installation and replacement can be achieved, which greatly simplifies the installation and replacement process, improves operating efficiency, and reduces maintenance costs.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cable frame protection material for aviation, characterized in that: The invention comprises a substrate layer, an adhesive layer and a release film layer which are sequentially laminated, wherein the substrate layer is made of modified expanded polytetrafluoroethylene, and the adhesive layer is made of modified medium-resistant enhanced pressure-sensitive adhesive, wherein: The modified expanded polytetrafluoroethylene is prepared by the following method: 25wt%-30wt% of pentafluorobenzyl acrylate, 15wt%-20wt% of organosilicon copolymer, 2wt%-5wt% of graphene, 2wt%-5wt% of molybdenum disulfide and 40wt%-55wt% of polytetrafluoroethylene dispersion resin are mixed, and then the mixture is subjected to aging, compression molding, extrusion calendering, degreasing, stretching and sintering. The modified medium-resistant enhanced pressure-sensitive adhesive is prepared by the following method: 15% to 25wt% of a γ-aminopropyltriethoxysilane coupling agent, 57% to 65wt% of a polyether polyurethane, 5% to 10wt% of a titanate, and 7% to 13wt% of a silicone additive are mixed and reacted.

2. The aviation cable frame protection material according to claim 1, characterized in that: The modified expanded polytetrafluoroethylene has a wear mass of ≤0.002g, a temperature resistance range of -260°C to 280°C, and a density of 0.4g / cm 3 ~0.9g / cm 3 , tensile strength is 20MPa~40MPa, and it is resistant to strong acids, alkalis and organic solvents.

3. The aviation cable frame protection material according to claim 1, characterized in that: After the modified medium-resistant enhanced pressure-sensitive adhesive is immersed in aviation medium at 50° C. for 1 hour, its peel strength is 0.2 kN / m to 2.0 kN / m.

4. The aviation cable frame protection material according to claim 1, characterized in that: The thickness of the substrate layer is 0.8 mm to 0.9 mm, the thickness of the adhesive layer is 0.05 mm to 0.1 mm, and the thickness of the release film layer is 0.01 mm to 0.03 mm.

5. A method for preparing an aviation cable frame protection material according to any one of claims 1 to 4, characterized in that: It includes: The modified expanded polytetrafluoroethylene is used as the base layer, and then the modified medium-resistant enhanced pressure-sensitive adhesive is used as the adhesive layer and coated on the base layer, and cured at 70±5° C., and then the coated adhesive layer is laminated with the release film layer to obtain the aviation cable frame protection material.

6. An aviation cable frame protection tape made of the aviation cable frame protection material according to any one of claims 1 to 4, characterized in that: The middle of the aviation cable frame protection tape is a mouth frame pasting positioning area, and the two sides are fixing areas for pasting on the two sides of the mouth frame.

7. The cable frame protection tape for aviation use according to claim 6, characterized in that: The width of the mouth frame pasting and positioning area in the middle of the aviation cable frame protection material is the mouth frame thickness.

8. The cable frame protection tape for aviation use according to claim 6, characterized in that: The fixing areas on both sides used for sticking to the two sides of the mouth frame are "sunflower" fan-shaped structures.

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