Aviation coating adhesive force improving method and system

Abstract

The invention discloses a method and a system for improving the adhesive force of an aviation coating. The lifting method comprises the steps that S1, cleaning is conducted, specifically, impurities on the surface of a workpiece are washed away through clear water, and then the workpiece is blow-dried through pure gas; s2, secondary cleaning is conducted, specifically, deionized water or an aviation professional cleaning agent is selected for ultrasonic cleaning according to the material of the workpiece, and then the workpiece is dried through a drying oven; s3, dust blowing treatment is conducted, specifically, the cleaned workpiece is subjected to dust blowing treatment through ultra-pure nitrogen; s4, plasma treatment is conducted, specifically, the optimal plasma treatment condition is selected according to the workpiece type, and plasma activation and cleaning treatment are conducted; and S5, coating of the coating on the workpiece is completed within a certain time. The method has the beneficial effects that on one hand, the cleanliness of a workpiece is greatly improved, on the other hand, the surface tension can be improved, the adhesive force of a coating and a substrate is improved, and the service life of the workpiece is prolonged.

Description

Technical Field

[0001] The invention relates to the adhesion of aviation coatings, and in particular to a method and system for improving the adhesion of aviation coatings. Background Art

[0002] Coating adhesion strength refers to the degree of firmness of the coating film and the substrate surface bonded together by physical and chemical forces. The strength of coating adhesion is affected by many factors, not only related to the properties and cleanliness of the substrate and coating itself, but also depends on factors such as the number and degree of interaction between the polymer polar groups in the coating and the polar groups on the substrate surface, including chemical bonds, intermolecular forces and mechanical forces.

[0003] Aviation light guide plates in aviation airborne equipment are widely used in night vision compatible lighting, push-button light guide control panel components LED lighting, etc. in military and civil aircraft. Its main material is organic glass, and the coating is polyurethane paint. In actual use, there are often paint peeling and paint falling, which affects product quality; aviation formation lights are lamps that help fighter pilots identify and maintain relative position relationships at night or in low light conditions to ensure the safety and effectiveness of formation flight. Its substrate is epoxy glass cloth board, and the coating is a multi-layer film structure containing a conductive film. Usually the first adhesive layer is also a polymer material such as polyurethane or acrylic resin. There are also a lot of quality problems such as cracking or even falling off during use. Therefore, it is a very important scientific / engineering problem to find ways to improve the adhesion of organic coatings on the surface of polymer airborne equipment. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and provide a novel method and system for improving the adhesion of aviation coatings.

[0005] In order to achieve the above object, the present invention provides a technical solution: a method for improving the adhesion of an aviation coating, comprising:

[0006] Step S1: Cleaning: rinse the impurities on the workpiece surface with clean water, and then blow dry with pure gas;

[0007] Step S2: Secondary cleaning: Deionized water or aviation professional cleaning agent is selected for ultrasonic cleaning according to the material of the workpiece, and then dried in an oven; in step S2, the power of the ultrasonic cleaning is 30-40kHz. The smaller the air bubbles at the high-frequency ultrasonic frequency, the weaker the cavitation intensity, and the less damage to the workpiece.

[0008] Step S3: dust blowing treatment: use ultrapure nitrogen to blow dust off the cleaned workpiece;

[0009] Step S4: plasma treatment: selecting the best plasma treatment conditions according to the type of workpiece, and performing plasma activation and cleaning treatment; and,

[0010] Step S5: Complete the coating on the workpiece within a certain period of time.

[0011] The present invention provides an aviation coating adhesion improvement system, which includes: an energy generator, which is the main engine of a plasma processing device; a vacuum / gas system, which is located outside the energy generator; a control system, which is located at the front side of the energy generator; and a temperature control system, which is located at the rear of the energy generator.

[0012] Preferably, the energy generator is customized according to the aerospace workpiece, and the cavity can be suitable for an aerospace workpiece with a maximum size of 500 mm×1200 mm;

[0013] Preferably, the vacuum / gas system includes a vacuum gauge, a vacuum valve, a vacuum pump, cooling water, process gas, a gas flow meter, an air intake valve, etc., and its function is to control the pneumatic components of the system, adjust the vacuum degree in the cavity and supply process gas.

[0014] Preferably, the process gas is mainly selected from oxygen, argon and a mixed gas of oxygen-argon according to our substrate, and the purity must be above 99.99%.

[0015] Preferably, the control system is composed of a programmable logic controller (PLC) and an industrial computer, and the system functions and operations are edited by system software.

[0016] Preferably, the temperature control unit mainly functions to control the temperature of components such as the cavity, the energy generator and the vacuum pump to prevent the components from overheating.

[0017] Compared with the prior art, the beneficial effects of the present invention are at least that: using the lifting method, on the one hand, the cleanliness of the workpiece is greatly improved; on the other hand, the surface is activated, which can increase the surface tension, improve the adhesion between the coating and the substrate, and increase the service life of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flow chart of a method for improving the adhesion of an aviation coating on an aviation light guide plate.

[0019] Figure 2 It is a structural schematic diagram of the aviation coating adhesion improvement system for aviation light guide plates of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below by means of specific embodiments in combination with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] Embodiment 1:

[0022] See also Figure 1 The figure shows a method for improving the adhesion of an aviation coating on an aviation light guide plate. The substrate is organic glass and the coating is polyurethane paint. The method for improving the adhesion of an aviation coating on an aviation light guide plate includes:

[0023] Step S1, cleaning: rinse the impurities on the surface of the substrate with deionized water, and then blow dry with pure air or pure nitrogen.

[0024] Step S2, secondary cleaning: ultrasonically clean the substrate with deionized water, and then dry it in an oven at a drying temperature of 60-100°C.

[0025] Step S3, dust blowing treatment: the cleaned substrate is subjected to dust blowing treatment using ultrapure nitrogen.

[0026] Step S4, plasma treatment: First, the optimal plasma treatment conditions for organic glass are explored, including plasma working gas, plasma radio frequency power, and treatment time, and then the organic glass surface is plasma activated and cleaned using the optimal plasma conditions. 2 Or 2 -Ar, RF power is 5000-8000w, working time is 1-5min.

[0027] Step S5: Complete the coating on the workpiece within 1-2 days.

[0028] The pull-off test was performed on the organic glass-polyurethane paint before and after plasma treatment to measure the change in its adhesion. The results of surface tension and interface adhesion are shown in Table 1.

[0029] Table 1 Changes in surface tension and adhesion before and after plasma treatment

[0030] Before plasma treatment After plasma treatment Surface tension (mN) 36.1±0.3 59.2±0.2 Interface Adhesion(Mpa) 17.54±1.17 25.55±2.24

[0031] Embodiment 2:

[0032] See also Figure 1 The figure shows a method for improving the adhesion of aviation coating of aviation formation lights. Among them, the substrate is an epoxy glass cloth board, and the coating is a conductive coating. The method for improving the adhesion of aviation coating of aviation light guide plate includes:

[0033] Step S1, cleaning: first rinse the impurities on the surface of the substrate with deionized water, and then blow dry with pure air or ultrapure nitrogen;

[0034] Step S2, secondary cleaning: firstly, ultrasonically clean the substrate with deionized water, and then dry it in an oven at 100-130°C;

[0035] Step S3, dust blowing treatment: the cleaned epoxy glass cloth plate is subjected to dust blowing treatment with ultrapure nitrogen;

[0036] Step S4, first explore the optimal plasma treatment conditions for organic glass, including plasma working gas, plasma radio frequency power, and treatment time, and then use the optimal plasma conditions to perform plasma activation and cleaning treatment on the organic glass surface. 2 -Ar, RF power is 2000-3000w, working time is 1min-5min. After experimental investigation, the power window of plasma treatment of epoxy glass cloth is narrow. When it exceeds 3000w, the surface tension no longer changes.

[0037] Step S5: Complete the coating on the workpiece within 1-2 days.

[0038] The pull-off test was performed on the epoxy glass cloth board-conductive coating before and after plasma treatment to measure the change in its adhesion. The surface tension and interface adhesion results are shown in Table 2.

[0039] Table 2 Changes in surface tension and adhesion before and after plasma treatment

[0040] Before plasma treatment After plasma treatment Surface tension (mN / m) 30.0±1.0 72.0±0.5 Interface Adhesion(Mpa) 20.07±1.28 43.84±2.72

[0041] Embodiment 3:

[0042] See also Figure 2 , the figure shows an aviation coating adhesion improvement system. The improvement system includes: a reaction chamber, an energy generator, a vacuum gauge, a vacuum pump, and a cooling water circuit.

[0043] 1. Energy generator: continuously and stably feeds energy into the reaction chamber to ionize the process gas.

[0044] 2. Vacuum gauge: detects the vacuum degree inside the reaction chamber. Located in the energy generator.

[0045] 3. Vacuum pump: evacuate the reaction chamber to a sufficient vacuum. Located below the energy generator.

[0046] 4. Vacuum valve: A valve driven by compressed air. If the compressed air pressure is insufficient, the valve may not be able to open. It is located between the energy generator and the vacuum pump.

[0047] 5. Cooling water circuit: The cooling water circuit is located on the left side of the energy generator and is used to cool the vacuum pump, RF power supply and electrodes.

[0048] 6. Inlet valve: located at the rear side of the plasma reaction chamber, used to deliver process gas into the reaction chamber.

[0049] 7. Purge valve: Located at the rear side of the plasma reaction chamber, it controls the gas to enter and purge the plasma chamber, reduce the concentration of reaction products in the chamber, and help the chamber return to normal pressure.

[0050] 8. Industrial computer: operated by dedicated control software, the industrial computer and PLC work together to complete the operation of the plasma system.

[0051] The above only expresses the implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A method for improving the adhesion of aviation coatings. It is characterized in that include: Step S1: Cleaning: rinse the impurities on the workpiece surface with clean water and then blow dry with pure gas; Step S2: Secondary cleaning: Deionized water or aviation professional cleaning agent is selected according to the material of the workpiece for ultrasonic cleaning, and then oven drying; Step S3: dust blowing treatment: use ultrapure nitrogen to blow dust off the cleaned workpiece; Step S4: plasma treatment: selecting the best plasma treatment conditions according to the type of workpiece, and performing plasma activation and cleaning treatment, wherein the working gas, radio frequency power and working time in the plasma treatment will affect the surface tension of the workpiece, thereby affecting the surface adhesion; and, Step S5: Complete the coating on the workpiece within a certain period of time.

2. The method for improving the adhesion of aviation coatings according to claim 1, It is characterized in that The pure gas in step S1 uses pure inert gas N 2 Or Ar, etc.

3. The method for improving the adhesion of aviation coatings according to claim 1, It is characterized in that The power of the ultrasonic cleaning described in step S2 is 30-40kHz.

4. The method for improving the adhesion of aviation coatings according to claim 1, It is characterized in that The plasma treatment conditions described in step S3 select different process parameters according to the type of substrate to be processed, and key process parameters include process gas, RF power and processing time.

5. The method for improving the adhesion of aviation coatings according to claim 4, It is characterized in that Step S3: Process gas selection O 2 , Ar, O 2 A mixture of N 2 etc.; RF power range is 200-8000w; working time is 10s-600s.

6. A system for implementing the method for improving the adhesion of aviation coatings as described in any one of claims 1 to 5.

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