CN115404011A - Method for bonding aircraft box section and expanded polytetrafluoroethylene in medium environment - Google Patents
Method for bonding aircraft box section and expanded polytetrafluoroethylene in medium environment Download PDFInfo
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- CN115404011A CN115404011A CN202211343488.9A CN202211343488A CN115404011A CN 115404011 A CN115404011 A CN 115404011A CN 202211343488 A CN202211343488 A CN 202211343488A CN 115404011 A CN115404011 A CN 115404011A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/02—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving pretreatment of the surfaces to be joined
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2451/00—Presence of graft polymer
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Abstract
The invention discloses a method for bonding an airplane box section and expanded polytetrafluoroethylene in a medium environment, relates to the field of aerospace sealing materials, and solves the problem that an expanded polytetrafluoroethylene material is difficult to bond in the medium environment, and comprises the following steps: performing corona treatment on the surface of the expanded polytetrafluoroethylene; coating the back surface with a glue; and carrying out segmented curing after the coating is finished. The roughness of the surface of the expanded polytetrafluoroethylene is increased through corona, the surface activity is increased, the prepared glue has extremely strong infiltration capacity, the prepared glue can infiltrate into micropores of the expanded polytetrafluoroethylene in the coating process to form molecular chain entanglement, and the bonding is stable and strong in bonding force; the curing temperature is low, overlarge micropores caused by volatilization of a solvent in the prepared rubber are avoided, the content of effective oil-resistant and oil-repellent functional groups in unit volume is ensured, and the oil resistance is good; the back glue can be prevented from being dissolved after being swelled after being heated to 120 ℃ and kept for 168 hours after being soaked in aviation fuel oil, and is free from falling and good in environment resistance.
Description
Technical Field
The invention relates to the technical field of aerospace expanded polytetrafluoroethylene forming connection, in particular to the technical field of bonding of an aerospace aircraft box section and expanded polytetrafluoroethylene.
Background
The wing box section mainly refers to a wing box, is a main bearing structure of a wing and comprises a front beam, a rear beam, an internal rib frame, an upper wall plate and a lower wall plate. The wing box is not only the main wing structure for keeping the airplane flying, but also takes over the work of the airplane fuel tank. Therefore, the wing box section is provided with opening frames at multiple positions, namely, openings such as oil tank openings are formed in the wing box section, and the openings are required to be sealed finally.
Polytetrafluoroethylene, commonly known as "plastic king", is a high molecular compound formed by polymerizing tetrafluoroethylene, and has excellent chemical stability, corrosion resistance, sealing property, high lubrication non-sticking property, electrical insulation property and good anti-aging endurance, and expanded polytetrafluoroethylene is formed by processing polytetrafluoroethylene dispersion resin through processes such as biaxial stretching and the like to form a microporous polytetrafluoroethylene material compounded with air. Traditional polytetrafluoroethylene material has the problem of low surface energy, belongs to the material that present solid material surface energy is the lowest, and after popped polytetrafluoroethylene material and air complex simultaneously, the gum bonds its surface and only the fractional bond on the material, and the majority is located popped polytetrafluoroethylene's hollow portion, then traditional popped polytetrafluoroethylene itself is difficult to bond, leads to the degree of difficulty greatly increased of popped polytetrafluoroethylene material bonding gum.
At present, the improvement technology of expanded polytetrafluoroethylene is very limited internationally and domestically, fluororubber and nitrile rubber are mostly adopted for sealing the opening frame on the wing box section of a civil aircraft or a combat aircraft, the oil-resistant effect is still good, but the curing time is long, and the curing pollution has great harm to the body of a constructor. Meanwhile, the installation efficiency is low, the repeated installation performance is avoided, and the device cannot be reused after being disassembled. An oil-resistant medium environment expanded polytetrafluoroethylene material is developed by foreign related companies such as DuPont and the like, but the oil-resistant medium environment expanded polytetrafluoroethylene material has no adhesiveness or repeated adhesiveness, when the oil-resistant medium environment expanded polytetrafluoroethylene material has no repeated adhesiveness, namely, a back adhesive does not form good adhesive force with the material, the back adhesive is easy to strip after being stressed, foam oil is easy to fall off after being adhered, contact oil is easy to swell and dissolve at the same time, and surplus matters are easy to form in aviation oil and can pollute the aviation oil.
Disclosure of Invention
The invention aims to: in order to solve the problem that the expanded polytetrafluoroethylene material is difficult to bond in a medium environment, the invention provides a bonding method of an aircraft box section and expanded polytetrafluoroethylene in the medium environment.
The invention specifically adopts the following technical scheme for realizing the purpose: the method for bonding the aircraft box section and the expanded polytetrafluoroethylene in the medium environment comprises the following steps:
step 1, performing corona treatment on the surface of expanded polytetrafluoroethylene;
step 2, coating a prepared adhesive on the surface of the expanded polytetrafluoroethylene subjected to corona treatment, wherein the prepared adhesive comprises ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone, a 2-pyridyl thiourea initiator and an isooctoate curing agent, and further comprises ethyl acetate, the ethyl methacrylate, the methyl methacrylate, the diethylene glycol dimethacrylate, the thermoplastic polyurethane, the acetone, the 2-pyridyl thiourea initiator and the isooctoate curing agent form a back adhesive, and the preparation method of the prepared adhesive comprises the following steps:
step a, adding ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone and a 2-pyridyl thiourea initiator into a stirring kettle, mixing the materials at 45-50 ℃ for 1-3h, and discharging to obtain a main adhesive;
step b, uniformly mixing the main glue with ethyl acetate and an iso-caprylate curing agent to obtain a compound glue;
and 4, cutting the solidified expanded polytetrafluoroethylene, matching the size corresponding to the size of the aerospace plane box section, punching and bonding.
In the technical scheme, expanded polytetrafluoroethylene is of a microporous structure, the surface and the interior of the expanded polytetrafluoroethylene are subjected to polarity modification through a corona process (because the expanded polytetrafluoroethylene is of a microporous structure, the surface and the interior of the expanded polytetrafluoroethylene can be modified through discharging), the roughness of the surface of the expanded polytetrafluoroethylene is increased, the surface activity of the expanded polytetrafluoroethylene is increased, meanwhile, the back glue is a double component, the double component comprises a main glue and a curing agent, ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, acetone, thermoplastic polyurethane and a 2-pyridyl thiourea initiator, and the mixture is mixed for 1-3 hours at 45-50 ℃ and then discharged to obtain the main glue and isooctoate as the curing agent; the gum has strong infiltration capacity (the gum formula has high molecular weight, meanwhile, a molecular chain is of a linear structure and has no branched chain, and the chain end of the molecular chain can enter a micropore of expanded polytetrafluoroethylene), can be infiltrated to the depth of 0.05-0.1mm inside the micropore of the expanded polytetrafluoroethylene in the coating process to form molecular chain entanglement, is stable in adhesion, and ensures strong adhesive force of the gum, solves the problem that the gum is difficult to attach, and in addition, the coating is segmented cured, so that the segmented curing avoids overlarge micropore caused by too fast volatilization of a solvent in the gum, ensures that the content of effective oil-resistant and oil-repellent functional groups in a unit volume is enough, and can ensure that the gum does not fall off and does not degum in a medium environment; this application subsidiary gum product of expanded polytetrafluoroethylene pastes to testing on the board, puts into medium environment such as aviation fuel, aviation hydraulic oil, aviation lubricating oil and soaks in to heat up to 120 ℃ and keep 168h and can guarantee that the gum is not dissolved by the swelling after, the subsidiary gum product of expanded polytetrafluoroethylene can be stably pasted and cover on the test block and do not drop, has solved the problem that current expanded polytetrafluoroethylene material is difficult to the bonding under medium environment.
In the application, the viscosity of the discharged main glue is too high, the advection property is poor, and the ethyl acetate is added to reduce the viscosity, so that the compounded glue has better wettability (the lower the viscosity, the better the fluidity, the easier the compounded glue flows into the expanded polytetrafluoroethylene material after corona treatment), and the compounded glue is easier to coat;
the gum is the product name, and ethyl acetate itself is volatile, all can volatilize in coating back and segmentation solidification, and after the solidification was accomplished, ethyl acetate also volatilized (under 40 ℃, about 10min, ethyl acetate will volatilize).
Furthermore, the corona power is 5kW-8kW, and the speed is 1-1.5m/min.
Further, the corona power was 7kW and the speed was 1.2m/min.
Further, the back adhesive comprises the following components in parts by weight: 40-60 parts of ethyl methacrylate, 15-18 parts of methyl methacrylate, 4-6 parts of diethylene glycol dimethacrylate, 10-15 parts of thermoplastic polyurethane, 60-70 parts of acetone and 3-8 parts of 2-pyridyl thiourea initiator.
Furthermore, the back adhesive comprises the following components in parts by weight: 50 parts of ethyl methacrylate, 16 parts of methyl methacrylate, 5 parts of diethylene glycol dimethacrylate, 12 parts of thermoplastic polyurethane, 65 parts of acetone and 5 parts of 2-pyridyl thiourea initiator.
Furthermore, the gum also comprises 0.006-0.012 part by weight of isooctanoate curing agent.
Furthermore, the back adhesive also comprises 0.009 parts of isooctanoid acid ester curing agent by weight.
Furthermore, the mass ratio of the main glue to the ethyl acetate is 100.
Further, the step curing comprises curing at 20-25 ℃ for 1.5-2.5h, curing at 65-75 ℃ for 15-25min, and then curing at 35-45 ℃ for 43-53h.
Furthermore, the step curing comprises curing at 22 ℃ for 2h, then curing in an oven at 70 ℃ for 20min, and then curing at 40 ℃ for 48h.
Further, the coating thickness is 100-150 μm.
Further, the coating thickness was 120 μm.
In the technical scheme of the application, the expanded polytetrafluoroethylene is an existing finished product.
The medium environment comprises aviation fuel oil, aviation hydraulic oil, aviation lubricating oil, refrigerating fluid or water.
The invention has the following beneficial effects:
1. the back glue is a double component, the double component comprises a main glue and a curing agent, ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, acetone, thermoplastic polyurethane and a 2-pyridyl thiourea initiator which are mixed for 1-3h at 45-50 ℃ and then discharged to obtain the main glue, and isooctanoate is the curing agent;
2. expanded polytetrafluoroethylene is of a microporous structure, polarity modification is carried out on the surface and the interior of the expanded polytetrafluoroethylene through a corona process (because the expanded polytetrafluoroethylene is of a microporous structure, discharge can be carried out on the surface and the interior of the expanded polytetrafluoroethylene), the roughness of the surface of the expanded polytetrafluoroethylene is increased, the surface activity of the expanded polytetrafluoroethylene is increased, and meanwhile, the gum has extremely strong infiltration capacity, can be infiltrated into the micropores of the expanded polytetrafluoroethylene in the coating process to form molecular chain entanglement, is stably adhered, and also ensures the extremely strong adhesive force of the gum;
3. after coating, segmented curing is carried out, the phenomenon that micropores are too large due to too fast volatilization of a solvent in the rubber preparation is avoided, the content of effective oil-resistant and oil-repellent functional groups in unit volume is enough, and the gum can be prevented from falling and degumming in a medium environment;
4. the expanded polytetrafluoroethylene with the gum product is pasted on a test board, soaked in water, aviation oil, aviation hydraulic oil, aviation lubricating oil and the like, heated to 120 ℃ and kept for 168 hours to ensure that the gum is not dissolved after swelling, and the expanded polytetrafluoroethylene with the gum product can be stably pasted on a test piece and does not fall off;
5. the back adhesive can be firmly fixed on the oil-resistant expanded polytetrafluoroethylene, and has extremely high oil resistance, environmental resistance and extremely high adhesive force on the corona-modified ultralow-surface-energy oil-resistant expanded polytetrafluoroethylene.
Drawings
FIG. 1 is an electron microscope image of expanded polytetrafluoroethylene of example 2 of the present invention at 20 μm after the surface is coated with a compounded adhesive;
FIG. 2 is an electron microscope image of 50 μm after the surface of expanded polytetrafluoroethylene of example 2 of the present invention is coated with a compounded adhesive;
FIG. 3 is an electron microscope image of the progressive layer 20 μm after the surface of the expanded polytetrafluoroethylene is coated with the compounded glue in example 2 of the invention;
FIG. 4 is an electron microscope image of the surface of expanded PTFE of example 2 of the present invention coated with a glue and then the progressive layer is 10 μm.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments.
Therefore, based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
Example 1
The embodiment provides an oil-resistant, medium-resistant and environment-resistant gum, which comprises the following components in parts by weight: 40 parts of ethyl methacrylate, 15 parts of methyl methacrylate, 4 parts of diethylene glycol dimethacrylate, 10 parts of thermoplastic polyurethane, 60 parts of acetone and 3 parts of 2-pyridyl thiourea initiator;
the back adhesive also comprises 0.006 part of isooctanoid acid ester curing agent according to the parts by weight;
the bonding method of the aircraft box section and the expanded polytetrafluoroethylene in the medium environment comprises the following steps:
step 1, performing corona treatment on the surface of expanded polytetrafluoroethylene, wherein the corona power is 5kW, and the speed is 1m/min;
step 2, coating a glue preparation on the surface of the expanded polytetrafluoroethylene subjected to corona treatment, wherein the glue preparation comprises the following components in parts by weight of ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone, a 2-pyridyl thiourea initiator, an isooctoate curing agent and ethyl acetate, and the preparation method of the glue preparation comprises the following steps:
step a, adding ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone and a 2-pyridyl thiourea initiator into a stirring kettle according to the parts by weight, mixing the materials at 45 ℃ for 3 hours, and discharging to obtain a main adhesive;
step b, uniformly mixing the main glue with ethyl acetate and an isooctoate curing agent to obtain a prepared glue, wherein the mass ratio of the main glue to the ethyl acetate is 100;
and 4, cutting the solidified expanded polytetrafluoroethylene, matching the size corresponding to the size of the aerospace plane box section, punching and bonding.
The cured expanded polytetrafluoroethylene in this application is adhered to the flap of the aerospace aircraft box section.
In addition, the position of a through hole is preset on a mouth frame on the wing box section, the expanded polytetrafluoroethylene is cut into a corresponding size, the through hole is formed in the expanded polytetrafluoroethylene, a bolt sequentially penetrates through the opening cover, the expanded polytetrafluoroethylene layer and the through hole in the mouth frame, and the opening cover is tightly pressed on the mouth frame by rotating the bolt.
Example 2
As shown in fig. 1 to 4, this embodiment provides an oil-resistant, medium-resistant, and environment-resistant gum, which includes the following components in parts by weight: 50 parts of ethyl methacrylate, 16 parts of methyl methacrylate, 5 parts of diethylene glycol dimethacrylate, 12 parts of thermoplastic polyurethane, 65 parts of acetone and 5 parts of 2-pyridyl thiourea initiator;
the back adhesive also comprises 0.009 parts of isooctanoid acid ester curing agent by weight;
the method for bonding the aircraft box section and the expanded polytetrafluoroethylene in the medium environment comprises the following steps:
step 1, performing corona treatment on the surface of expanded polytetrafluoroethylene, wherein the corona power is 6kW and the speed is 1.2m/min;
step 2, coating a glue preparation on the surface of the expanded polytetrafluoroethylene subjected to corona treatment, wherein the glue preparation comprises the following components in parts by weight of ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone, a 2-pyridyl thiourea initiator, an isooctoate curing agent and ethyl acetate, and the preparation method of the glue preparation comprises the following steps:
step a, adding ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone and a 2-pyridyl thiourea initiator into a stirring kettle according to the parts by weight, mixing the materials for 2 hours at 48 ℃, and discharging to obtain a main adhesive;
step b, uniformly mixing the main glue with ethyl acetate and an isooctoate curing agent to obtain a compound glue, wherein the mass ratio of the main glue to the ethyl acetate is 100;
and 4, cutting the solidified expanded polytetrafluoroethylene, matching the expanded polytetrafluoroethylene with the size corresponding to the size of the aerospace plane box section, and then punching and bonding.
The popped polytetrafluoroethylene that the solidification was accomplished in this application hugs closely the flap of aerospace aircraft box section.
In addition, the position of a through hole is preset on the opening frame on the wing box section, the expanded polytetrafluoroethylene is cut to have a corresponding size, the through hole is formed in the expanded polytetrafluoroethylene, the bolt sequentially penetrates through the opening cover, the expanded polytetrafluoroethylene layer and the through hole in the opening frame, and the opening cover is tightly pressed on the opening frame by rotating the bolt.
As shown in fig. 1 and 2, the upper layer is a back adhesive, the middle layer is a progressive layer (a layer in which the back adhesive and the expanded polytetrafluoroethylene are intertwined), and the lower layer is an expanded polytetrafluoroethylene layer; fig. 3 and 4 are enlarged views of the progressive layer in the middle.
Example 3
The embodiment provides an oil-resistant, medium-resistant and environment-resistant gum, which comprises the following components in parts by weight: 60 parts of ethyl methacrylate, 18 parts of methyl methacrylate, 6 parts of diethylene glycol dimethacrylate, 15 parts of thermoplastic polyurethane, 70 parts of acetone and 8 parts of 2-pyridyl thiourea initiator;
the back adhesive also comprises 0.012 part by weight of iso-caprylate curing agent;
the bonding method of the aircraft box section and the expanded polytetrafluoroethylene in the medium environment comprises the following steps:
step 1, performing corona treatment on the surface of expanded polytetrafluoroethylene, wherein the corona power is 8kW, and the speed is 1.5m/min;
step 2, coating a glue preparation on the surface of the expanded polytetrafluoroethylene subjected to corona treatment, wherein the glue preparation comprises the following components in parts by weight of ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone, a 2-pyridyl thiourea initiator, an isooctoate curing agent and ethyl acetate, and the preparation method of the glue preparation comprises the following steps:
step a, adding ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone and a 2-pyridyl thiourea initiator into a stirring kettle according to the parts by weight, mixing the materials for 1 hour at 50 ℃, and discharging to obtain a main adhesive;
step b, uniformly mixing the main glue with ethyl acetate and an isooctoate curing agent to obtain a compound glue, wherein the mass ratio of the main glue to the ethyl acetate is 100;
and 4, cutting the solidified expanded polytetrafluoroethylene, matching the expanded polytetrafluoroethylene with the size corresponding to the size of the aerospace plane box section, and then punching and bonding.
The cured expanded polytetrafluoroethylene in this application is adhered to the flap of the aerospace aircraft box section.
In addition, the position of a through hole is preset on the opening frame on the wing box section, the expanded polytetrafluoroethylene is cut to have a corresponding size, the through hole is formed in the expanded polytetrafluoroethylene, the bolt sequentially penetrates through the opening cover, the expanded polytetrafluoroethylene layer and the through hole in the opening frame, and the opening cover is tightly pressed on the opening frame by rotating the bolt.
Example 4
The embodiment provides an oil-resistant, medium-resistant and environment-resistant gum, which comprises the following components in parts by weight: 45 parts of ethyl methacrylate, 17 parts of methyl methacrylate, 4.5 parts of diethylene glycol dimethacrylate, 14 parts of thermoplastic polyurethane, 62 parts of acetone and 4 parts of 2-pyridyl thiourea initiator;
the back adhesive also comprises 0.008 parts of isooctoate curing agent according to the parts by weight;
the method for bonding the aircraft box section and the expanded polytetrafluoroethylene in the medium environment comprises the following steps:
step 1, performing corona treatment on the surface of expanded polytetrafluoroethylene, wherein the corona power is 7kW, and the speed is 1.3m/min;
step 2, coating a glue preparation on the surface of the expanded polytetrafluoroethylene subjected to corona treatment, wherein the glue preparation comprises the following components in parts by weight of ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone, a 2-pyridyl thiourea initiator, an isooctoate curing agent and ethyl acetate, and the preparation method of the glue preparation comprises the following steps:
step a, adding ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone and a 2-pyridyl thiourea initiator into a stirring kettle according to the parts by weight, mixing the materials for 2 hours at 48 ℃, and discharging to obtain a main adhesive;
step b, uniformly mixing the main glue with ethyl acetate and an isooctoate curing agent to obtain a prepared glue, wherein the mass ratio of the main glue to the ethyl acetate is 100;
and 4, cutting the solidified expanded polytetrafluoroethylene, matching the size corresponding to the size of the aerospace plane box section, punching and bonding.
The popped polytetrafluoroethylene that the solidification was accomplished in this application hugs closely the flap of aerospace aircraft box section.
In addition, the position of a through hole is preset on a mouth frame on the wing box section, the expanded polytetrafluoroethylene is cut into a corresponding size, the through hole is formed in the expanded polytetrafluoroethylene, a bolt sequentially penetrates through the opening cover, the expanded polytetrafluoroethylene layer and the through hole in the mouth frame, and the opening cover is tightly pressed on the mouth frame by rotating the bolt.
Example 5
The embodiment provides an oil-resistant, medium-resistant and environment-resistant gum, which comprises the following components in parts by weight: 55 parts of ethyl methacrylate, 17 parts of methyl methacrylate, 5.5 parts of diethylene glycol dimethacrylate, 14 parts of thermoplastic polyurethane, 68 parts of acetone and 7 parts of 2-pyridyl thiourea initiator;
the back adhesive also comprises 0.011 part of iso-caprylic acid ester curing agent;
the bonding method of the aircraft box section and the expanded polytetrafluoroethylene in the medium environment comprises the following steps:
step 1, performing corona treatment on the surface of expanded polytetrafluoroethylene, wherein the corona power is 6kW and the speed is 1.2m/min;
step 2, coating a prepared adhesive on the surface of the expanded polytetrafluoroethylene subjected to corona treatment, wherein the prepared adhesive comprises the following components in parts by weight of ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone, a 2-pyridyl thiourea initiator, an isooctoate curing agent and ethyl acetate, and the preparation method of the prepared adhesive comprises the following steps:
step a, adding ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone and a 2-pyridyl thiourea initiator into a stirring kettle according to the parts by weight, mixing the materials for 2 hours at 48 ℃, and discharging to obtain a main adhesive;
step b, uniformly mixing the main glue with ethyl acetate and an isooctoate curing agent to obtain a prepared glue, wherein the mass ratio of the main glue to the ethyl acetate is 100;
and 4, cutting the solidified expanded polytetrafluoroethylene, matching the size corresponding to the size of the aerospace plane box section, punching and bonding.
The cured expanded polytetrafluoroethylene in this application is adhered to the flap of the aerospace aircraft box section.
In addition, the position of a through hole is preset on the opening frame on the wing box section, the expanded polytetrafluoroethylene is cut to have a corresponding size, the through hole is formed in the expanded polytetrafluoroethylene, the bolt sequentially penetrates through the opening cover, the expanded polytetrafluoroethylene layer and the through hole in the opening frame, and the opening cover is tightly pressed on the opening frame by rotating the bolt.
In the above examples, the back adhesive is composed of ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone, 2-pyridylthiourea initiator and isooctanoate curing agent.
Claims (9)
1. The bonding method of the aircraft box section and the expanded polytetrafluoroethylene in the medium environment is characterized by comprising the following steps:
step 1, performing corona treatment on the surface of expanded polytetrafluoroethylene;
step 2, coating a prepared adhesive on the surface of the expanded polytetrafluoroethylene subjected to corona treatment, wherein the prepared adhesive comprises ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone, a 2-pyridyl thiourea initiator and an isooctoate curing agent, and further comprises ethyl acetate, the ethyl methacrylate, the methyl methacrylate, the diethylene glycol dimethacrylate, the thermoplastic polyurethane, the acetone, the 2-pyridyl thiourea initiator and the isooctoate curing agent form a back adhesive, and the preparation method of the prepared adhesive comprises the following steps:
step a, adding ethyl methacrylate, methyl methacrylate, diethylene glycol dimethacrylate, thermoplastic polyurethane, acetone and a 2-pyridyl thiourea initiator into a stirring kettle, mixing the materials at 45-50 ℃ for 1-3h, and discharging to obtain a main adhesive;
b, uniformly mixing the main glue with ethyl acetate and an iso-caprylate curing agent to obtain a compound glue;
step 3, performing segmented curing after coating;
and 4, cutting the solidified expanded polytetrafluoroethylene, matching the size corresponding to the size of the aerospace plane box section, punching and bonding.
2. A method of bonding an aircraft cassette section to expanded polytetrafluoroethylene in a media environment according to claim 1, wherein said corona power is 5kW to 8kW and said speed is 1m/min to 1.5m/min.
3. The method for bonding the aircraft box section to the expanded polytetrafluoroethylene in the medium environment according to claim 1, wherein the back adhesive comprises the following components in parts by weight: 40-60 parts of ethyl methacrylate, 15-18 parts of methyl methacrylate, 4-6 parts of diethylene glycol dimethacrylate, 10-15 parts of thermoplastic polyurethane, 60-70 parts of acetone and 3-8 parts of 2-pyridyl thiourea initiator.
4. The method for bonding an aircraft box section to expanded polytetrafluoroethylene in a medium environment according to claim 1, wherein the back adhesive comprises the following components in parts by weight: 50 parts of ethyl methacrylate, 16 parts of methyl methacrylate, 5 parts of diethylene glycol dimethacrylate, 12 parts of thermoplastic polyurethane, 65 parts of acetone and 5 parts of 2-pyridyl thiourea initiator.
5. The method for bonding an aircraft box section with expanded polytetrafluoroethylene in a medium environment according to claim 3 or 4, wherein the back adhesive further comprises 0.006-0.012 parts by weight of isooctanoate curing agent.
6. The method of claim 3 or 4, wherein the adhesive backing further comprises 0.009 parts by weight of iso-octoate curing agent.
7. The method for bonding the aircraft box section to the expanded polytetrafluoroethylene in the medium environment according to claim 6, wherein the mass ratio of the main adhesive to the ethyl acetate is 100-20.
8. The method of claim 1, wherein the step curing comprises curing at 20-25 ℃ for 1.5-2.5 hours, curing at 65-75 ℃ for 15-25min, and curing at 35-45 ℃ for 43-53 hours.
9. The method of claim 1 wherein the coating has a thickness of 100 to 150 μm.
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| CN115404011B (en) | 2023-03-03 |
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