Construction process method of high-performance sand corrosion / rain corrosion resistant coating

Abstract

The invention belongs to the field of material technology, surface treatment and part manufacturing, and particularly relates to a construction process method of a high-performance sand corrosion / rain corrosion resistant coating. The method comprises the following steps: step 1, carrying out surface pretreatment on the helicopter rotor blade; 2, spraying protective primer on the helicopter rotor blade subjected to surface pretreatment; 3, the helicopter rotor blade sprayed with the protective primer is filled with putty in a scraping mode; step 4, spraying sand corrosion / rain corrosion resistant primer on the helicopter rotor blade subjected to putty scraping and filling; and 5, spraying sand corrosion / rain corrosion resistant finish paint on the helicopter rotor blade sprayed with the sand corrosion / rain corrosion resistant primer.

Description

Technical Field

[0001] The invention belongs to the fields of material technology, surface treatment and parts manufacturing, and particularly relates to a construction process method for a high-performance sand erosion / rain erosion resistant coating. Background Art

[0002] Helicopters primarily operate in harsh environments, including wet / hot, dry / cold, dust / rain, and seawater. During use, their composite blades are susceptible to erosion by rain, aerosol, and impact from dust, which can damage them, reducing their service life and increasing maintenance costs. Therefore, protecting composite blades from harsh environments like dust and rain has always been a key focus for helicopters.

[0003] Traditional blade protective coatings lack elasticity and are prone to problems such as coating cracking, wear, and poor corrosion resistance during use. Summary of the Invention

[0004] Purpose of the invention: To provide a high-performance sand erosion / rain erosion resistant coating construction process method to improve the appearance quality while avoiding the dilemma of being unable to polish putty on the surface of the sand erosion / rain erosion resistant coating, thereby ensuring the smooth formation of the relevant coating system.

[0005] The technical solution of the present invention: A high-performance sand erosion / rain erosion resistant coating construction process for helicopter rotor blades, the method comprising: Step 1: Surface pretreatment of helicopter rotor blades; Step 2: Spray protective primer on the helicopter rotor blade after surface pretreatment; Step 3: Scrape and fill putty on the helicopter rotor blades after spraying protective primer; Step 4: Spray the helicopter rotor blades after scraping and filling with putty with sand erosion / rain erosion resistant primer; Step 5: Spray the helicopter rotor blades with sand erosion / rain erosion resistant topcoat after spraying the sand erosion / rain erosion resistant primer.

[0006] Furthermore, in step 2, S06-12 primer is used: S06-12 primer is mixed with a main agent and a curing agent in a mass ratio of 38:9, and a diluent is added to dilute it, and the viscosity is adjusted to 14~20s, wherein the main agent includes: polyester resin, pigment, filler; the curing agent is isocyanate.

[0007] Furthermore, in step 2, H06-1371 primer is used; H06-1371 primer is a mixture of a main agent and a curing agent in a mass ratio of 100:30, and an appropriate amount of diluent is added to dilute it and adjust the viscosity to 12~18s, wherein the main agent is polyester resin, chromium-free anti-rust color filler, additives, and organic solvent; the curing agent is modified polyurethane.

[0008] Furthermore, in step 2, the temperature of the painting workplace should be between 15°C and 35°C, and the relative humidity of the air should be between 30% and 75%.

[0009] Furthermore, in step 3, Z07-14 putty is used, wherein Z07-14 putty is polyester putty.

[0010] Furthermore, in step 4, the sand erosion / rain erosion resistant primer is prepared by mixing components A and B in a mass ratio of A:B=2:1, adding a diluent to dilute the mixture, and adjusting the viscosity to 20~30s; component A is a base material composed of a hydroxyl-terminated aromatic modified elastic polyurethane resin, a functional filler, an additive, and a solvent; component B is a main curing agent composed of an isocyanate-terminated aromatic modified elastic polyurethane resin and a solvent.

[0011] Furthermore, in step 4, the temperature of the painting workplace should be between 15°C and 35°C, and the relative humidity of the air should be between 30% and 75%.

[0012] Furthermore, in step 4, the thickness of the sand erosion / rain erosion resistant primer is controlled at 120±20 μm.

[0013] Furthermore, in step 5, the sand erosion / rain erosion resistant topcoat is prepared by mixing components A and B in a mass ratio of 7:3, adding a diluent to dilute the mixture, and adjusting the viscosity to 20~30s; component A is a base material, which is composed of a hydroxyl-terminated low surface energy modified aliphatic polyurethane resin, a functional filler, an additive, and a solvent; component B is a curing agent, which is composed of an isocyanate-terminated aliphatic polyurethane resin and a solvent.

[0014] Furthermore, in step 5, the temperature of the painting workplace should be between 15°C and 35°C, and the relative humidity of the air should be between 30% and 75%.

[0015] The beneficial effects of this application are: The present invention is constructed in the order of "surface pretreatment + spraying protective primer + scraping and filling putty + spraying sand erosion / rain erosion resistant primer + spraying sand erosion / rain erosion resistant topcoat". It can not only add putty to the coating system to improve the appearance quality, but also avoid the dilemma of not being able to polish putty on the surface of the sand erosion / rain erosion resistant coating, and can ensure the smooth formation of the relevant coating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a typical schematic diagram of the current coating puttying process; Figure 2 This is a typical schematic diagram of the puttying treatment of the sand erosion / rain erosion resistant coating; Figure 3 Schematic diagram of the formation of sand erosion / rain erosion resistant coating. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the implementation of this application will be described in more detail below in conjunction with the drawings in the implementation of this application. In the drawings, the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and should not be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in conjunction with the drawings.

[0018] In the description of the present invention, it should be understood that the terms "center", "axial", "vertical", "up", "down", "upper end", "bottom end", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0019] Helicopter rotor blades are mainly composite blades. The traditional coating construction process is usually: surface pretreatment, primer, putty, primer and topcoat. This is because composite blades are mainly formed by a one-time compression molding process, and the surface quality is difficult to control. After molding, some surface defects such as pinholes and pits are prone to appear. Primer and topcoat cannot completely cover these defects, and putty is needed to fill them to improve the appearance quality. The current coating putty treatment effect is as follows Figure 1 . The effect of sand erosion / rain erosion resistant coating puttying is as follows. Figure 2 .

[0020] High-performance sand-erosion / rain-erosion-resistant coatings are a special type of polyurethane coating with excellent elasticity and erosion resistance. Traditional application methods have resulted in the coating being impractical for puttying and polishing. Analysis suggests this may be due to the coating's high elasticity and resistance to polishing. If puttying is not possible, coating composite blades with high-performance sand-erosion / rain-erosion-resistant coatings alone will not guarantee a satisfactory appearance.

[0021] The present invention mainly proposes a construction process method for high-performance sand erosion / rain erosion resistant coatings for helicopter rotor blades, which is conducive to the application of high-performance sand erosion / rain erosion resistant coatings on helicopter rotor blades and has important significance and application value.

[0022] The present invention provides a construction process for a high-performance sand / rain erosion resistant coating suitable for helicopter rotor blades: "surface pretreatment + spraying of existing primer + scraping and filling of existing putty + spraying of sand / rain erosion resistant primer + spraying of sand / rain erosion resistant topcoat". According to this construction method, putty can be added to the coating system to improve the appearance quality, while avoiding the problem of not being able to polish the putty on the surface of the sand / rain erosion resistant coating, and can ensure the smooth formation of the relevant coating system. The schematic diagram of the sand / rain erosion resistant coating formation is shown in the figure. Figure 3 .

[0023] The present invention provides a high-performance sand erosion / rain erosion resistant coating construction process method for helicopter rotor blades, the method comprising: Step 1: Surface preparation 1. Processing: Before coating, the surface of composite parts should be free of defects such as bubbles, lumps and scratches, and the surface must be clean without release agents, glue, oil stains and dust. It can be cleaned with a water-based detergent or an equivalent degreasing liquid, rinsed with water and the cleaning quality checked by the water film method.

[0024] 2. Check: Use the water film continuity method to check the surface cleanliness. Place the blade horizontally, and all surfaces to be painted should be subjected to the water film continuity test. Spray clean water on the surface of the treated parts to form a water film. If the water film does not break, bifurcate, or aggregate into discrete water droplets within 30 seconds and remains continuous, it is considered qualified. If the water film continuity test fails, the next production process shall not be carried out, and the blade substrate treatment process shall be repeated until the water film continuity is passed. Substrates that have been painted for more than 24 hours after the surface is cleaned must be re-tested for water film.

[0025] 3. Isolation: Surfaces that are not allowed to be painted according to regulations or requirements should be protected with paper, adhesive tape, etc.

[0026] 4. Preparation: Before painting, parts must be wiped with a clean cloth dipped in methyl ethyl ketone solvent or corresponding thinner.

[0027] For baked parts, spraying should be carried out after the surface temperature of the parts drops to room temperature.

[0028] Step 2: Spray Protective Primer 1. Check: The paint should be carefully checked after opening the barrel. If any defects such as gelling and clumping are found, use should be stopped. The paint must be stirred evenly before use. If a shaker is used for stirring, the shaking time should be ≥5 minutes.

[0029] 2. Preparation: Prepare S06-12 primer or H06-1371 primer as needed.

[0030] For S06-12 primer, mix the components according to the specified mass ratio (component one (main agent: polyester resin, pigment, filler): component two (curing agent: isocyanate) = 38:9), and add appropriate amount of diluent as needed to dilute, adjust the viscosity to 14~20s (coating 4), stir evenly and filter with a suitable filter. After standing at room temperature for 5 minutes, it can be applied.

[0031] The active period of the prepared S06-12 primer is 4 hours and it cannot be used after the expiration date.

[0032] For H06-1371 primer, mix the components according to the specified mass ratio (component 1 (main agent polyester resin, chrome-free anti-rust pigment filler, additives, organic solvent): component 2 (curing agent: modified polyurethane) = 100:30), and add appropriate amount of diluent as needed to dilute, adjust the viscosity to 12~18s (coating 4), stir evenly and filter with a suitable filter. After standing at room temperature for 30 minutes, it can be applied.

[0033] The active period of the prepared H06-1371 primer is 8 hours and it cannot be used after the expiration date.

[0034] 3. Spraying: The temperature in the painting workplace should be between 15°C and 35°C, and the relative humidity should be between 30% and 75%.

[0035] The paint spraying room should be clean, free of dust and flying impurities, and have good ventilation, good lighting and natural light.

[0036] Before spraying, wipe the surface to be coated with a clean white cloth dipped in alcohol, methyl ethyl ketone solvent or corresponding thinner. Do not touch the cleaned surface to be sprayed with bare hands.

[0037] The treated surface should be sprayed as soon as possible if it is not contaminated. If spraying is not possible in time, it should be protected.

[0038] Use spray gun equipment for spraying (such as W-77 spray gun, etc.) Each time you spray, spray 50% of the overlap area. 4. Drying: Allow to dry with S06-12 primer or H06-1371 primer as needed.

[0039] S06-12 primer: dry at room temperature for 24 hours or at 40℃~49℃ for 6 hours; H06-1371 primer: Dry at room temperature for 12 hours or at 40℃~50℃ for 3 hours~5 hours.

[0040] Step 3: Scrape and fill putty 1. Preparation: For Z07-14 putty, mix the components according to the specified mass ratio (putty slurry (polyester putty): curing agent = 100:2).

[0041] The active period of the prepared putty is 5 minutes and it cannot be used after the expiration date.

[0042] 2. Scrape filling: Use a scraper to scrape the prepared putty onto the surface of the parts that have been sprayed with primer, and fill the putty in the required areas such as pits and pinholes on the surface.

[0043] 3. Drying: Dry at 25-35°C for 2 hours; 4. Polishing: Use sandpaper or a nylon scraper to smooth the putty layer. Remove any excess putty from the blade surface, periphery, and bushing, except for pinholes and pits. Blow away any dust with compressed air, then use a clean rag (or sticky cloth) to remove any remaining dust.

[0044] Step 4: Spray sand / rain erosion resistant primer 1. Check: The paint should be carefully checked after opening the barrel. If any defects such as gelling and clumping are found, use should be stopped. The paint must be stirred evenly before use. If a shaker is used for stirring, the shaking time should be ≥5 minutes.

[0045] 2. Preparation: For sand erosion / rain erosion resistant primer, mix components A and B in the prescribed mass ratio (A:B=2:1), and add appropriate amount of special diluent to dilute according to actual needs, adjust the viscosity to 20~30s (apply 4), stir evenly and filter with a suitable filter. After standing at room temperature for 5~10 minutes, it can be applied.

[0046] The active period of the prepared sand erosion / rain erosion resistant primer is 3 hours and it cannot be used after the expiration date.

[0047] Note: Sand erosion / rain erosion resistant primer: Component A is mainly the base material, which is composed of hydroxyl-terminated aromatic modified elastic polyurethane resin, functional fillers, additives, and solvents. The functional fillers are: anti-corrosion, anti-penetration, and static conductive functional fillers; Component B is mainly the curing agent, which is composed of isocyanate-terminated aromatic modified elastic polyurethane resin and solvents.

[0048] 3. Spraying: The temperature in the painting workplace should be between 15°C and 35°C, and the relative humidity should be between 30% and 75%.

[0049] The paint spraying room should be clean, free of dust and flying impurities, and have good ventilation, good lighting and natural light.

[0050] Before spraying, clean the surface to be painted with clean white cloth dipped in alcohol, methyl ethyl ketone solvent or corresponding diluent. The cleaned surface to be painted must not be touched with bare hands.

[0051] The treated surface should be sprayed as soon as possible without contamination. If it cannot be sprayed in time, it should be protected.

[0052] Use appropriate spray gun equipment for spraying.

[0053] Spray according to the appropriate overlap area for each spraying.

[0054] Note: The sand / rain erosion resistant primer thickness is controlled at 120 ± 20 μm.

[0055] 4. Drying: After the parts are sprayed, they can be dried at room temperature for 24 hours. If you want to accelerate curing, you can transfer the coating to an oven at about 50°C after the coating is dry at room temperature, and accelerate curing for 4 hours to dry.

[0056] Step 5: Spray sand / rain erosion resistant topcoat 1. Inspection: After the paint is opened, it should be carefully inspected. If there are any defects such as gelation and clumping, it should be stopped from use. The paint must be stirred evenly before use. If a shock machine is used for stirring, the shock time should be ≥ 5 min.

[0057] 2. Preparation: The sand / rain erosion resistant topcoat is mixed according to the specified mass ratio (A:B=7:3) of A and B components, and appropriate amount of special diluent can be added for dilution according to actual needs to adjust the viscosity to 20-30s (4 coats). After stirring evenly, it is filtered with appropriate filter screen, and after standing for 5-10 min at room temperature, it can be applied.

[0058] The active period of the prepared sand / rain erosion resistant topcoat is 3h, and it cannot be used beyond the period.

[0059] Note: The sand / rain erosion resistant topcoat is a two-component paint. The A component is mainly base material, which is composed of hydroxyl-terminated low surface energy modified aliphatic polyurethane resin, functional filler, additive, and solvent. The functional filler is a filler with functions such as anti-aging, wear resistance, and static conductivity. The B component is mainly curing agent, which is composed of isocyanate-terminated aliphatic polyurethane resin and solvent.

[0060] 3. Spraying: The temperature of the paint application site should be 15-35°C, and the relative humidity of the air should be 30-75%.

[0061] The paint spraying room should be clean, dust-free, and free of flying impurities, with good ventilation, good lighting, and natural lighting.

[0062] Before spraying, wipe the surface to be coated with a clean white cloth dipped in alcohol, methyl ethyl ketone solvent or corresponding thinner. Do not touch the cleaned surface to be sprayed with bare hands.

[0063] The treated surface should be sprayed as soon as possible if it is not contaminated. If spraying is not possible in time, it should be protected.

[0064] Use suitable spray gun equipment for spraying.

[0065] Each time you spray, spray according to the appropriate overlapping surface.

[0066] Note: The thickness of the sand erosion / rain erosion resistant topcoat should be controlled at 60±20μm.

[0067] 4. Drying: After spraying, the parts can be left at room temperature for 24 hours to dry completely. If you want to accelerate the curing, after the coating is dry at room temperature, transfer it to an oven at about 50℃ and accelerate the curing for 4 hours to dry completely.

[0068] Note: Under normal circumstances, the primer should be sanded with 200-400 grit sandpaper after curing before applying the topcoat. The total thickness of the primer coating should be ≤200μm.

[0069] The primer uses aromatic modified elastic polyurethane as the base resin, and adds functional fillers such as anti-corrosion, anti-penetration, and static conductivity, breaking through the key technology of preparing lightweight and high-strength coatings; the topcoat uses low surface energy modified aliphatic polyurethane resin as the base resin, and adds functional fillers such as aging resistance, wear resistance, and static conductivity, breaking through the key technology of preparing multifunctional compatible coatings such as sand erosion and rain erosion resistance, anti-static, hydrophobic and anti-icing.

[0070] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A high performance sand erosion / rain erosion resistant coating construction process, characterized in that: For use with a helicopter rotor blade, the method comprises: Step 1: Surface pretreatment of helicopter rotor blades; Step 2: Spray protective primer on the helicopter rotor blade after surface pretreatment; Step 3: Scrape and fill putty on the helicopter rotor blades after spraying protective primer; Step 4: Spray the helicopter rotor blades after scraping and filling with putty with sand erosion / rain erosion resistant primer; Step 5: Spray the helicopter rotor blades with sand erosion / rain erosion resistant topcoat after spraying the sand erosion / rain erosion resistant primer.

2. The method according to claim 1, characterized in that In step 2, use S06-12 primer: S06-12 primer is a mixture of a main agent and a curing agent in a mass ratio of 38:9, and a diluent is added to dilute it to adjust the viscosity to 14~20s. The main agent includes: polyester resin, pigment, and filler; the curing agent is isocyanate.

3. The method according to claim 2, characterized in that In step 2, H06-1371 primer is used; H06-1371 primer is a mixture of a main agent and a curing agent in a mass ratio of 100:30, and an appropriate amount of diluent is added to dilute it and adjust the viscosity to 12~18s. Among them, the main agent is polyester resin, chromium-free anti-rust pigment filler, additives, and organic solvent; the curing agent is modified polyurethane.

4. The method according to claim 3, characterized in that In step 2, the temperature of the painting workplace should be between 15°C and 35°C, and the relative humidity of the air should be between 30% and 75%.

5. The method according to claim 4, characterized in that In step 3, Z07-14 putty is used, wherein Z07-14 putty is polyester putty.

6. The method according to claim 5, characterized in that In step 4, the sand erosion / rain erosion resistant primer is prepared by mixing components A and B in a mass ratio of A:B=2:1, adding a diluent to dilute the mixture, and adjusting the viscosity to 20~30s; component A is a base material composed of a hydroxyl-terminated aromatic modified elastic polyurethane resin, a functional filler, an additive, and a solvent; component B is a main curing agent composed of an isocyanate-terminated aromatic modified elastic polyurethane resin and a solvent.

7. The method according to claim 6, characterized in that In step 4, the temperature of the painting workplace should be between 15°C and 35°C, and the relative humidity of the air should be between 30% and 75%.

8. The method according to claim 7, characterized in that In step 4, the thickness of the sand erosion / rain erosion resistant primer is controlled at 120±20 μm.

9. The method according to claim 8, characterized in that In step 5, the sand erosion / rain erosion resistant topcoat is prepared by mixing components A and B in a mass ratio of 7:3, adding a diluent to dilute the mixture, and adjusting the viscosity to 20-30s; component A is a base material composed of a hydroxyl-terminated low surface energy modified aliphatic polyurethane resin, a functional filler, an additive, and a solvent; component B is a curing agent composed of an isocyanate-terminated aliphatic polyurethane resin and a solvent.

10. The method according to claim 9, characterized in that In step 5, the temperature of the painting workplace should be between 15°C and 35°C, and the relative humidity of the air should be between 30% and 75%.

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