Ship propeller coating method

Abstract

The invention discloses a ship propeller coating method which comprises the following steps: step 1, cleaning a to-be-coated area of a propeller, and carrying out binding protection on a key area; step 2, performing sand blasting treatment on a to-be-coated area of the propeller; 3, spraying is conducted on the to-be-coated area of the propeller; and 4, after spraying is completed, propeller protection is dismantled. By spraying a plurality of graphene paint coatings on the surface of the propeller, the adhesion of marine organisms on the propeller can be reduced, and the corrosion resistance of the propeller is enhanced, so that the propelling efficiency of the propeller is improved, and the service life of the propeller is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of ship construction, and in particular relates to a ship propeller coating method. Background Art

[0002] The ship propeller is the power system of the entire ship system and is a vital part of the entire ship system. The ship propeller is a nickel-aluminum bronze casting, and the surface is finely processed and polished to reduce friction. Although the copper matrix is ​​not easy to corrode, it will still corrode under the action of high-speed rotating water flow and cavitation, causing a decrease in speed, an increase in fuel consumption, and huge losses.

[0003] At present, ships do not take further coating measures on propellers for anti-corrosion and anti-fouling, so that after the ship is sailing, a large amount of maintenance costs will be incurred for the propellers and the shipping costs of the ship. Therefore, the coating of ship propellers will be a new trend in shipbuilding. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a ship propeller coating method to improve the propulsion efficiency and service life of the propeller.

[0005] The object of the present invention is achieved through the following technical scheme: a method for coating a ship propeller, comprising the following steps:

[0006] Step 1: Clean the propeller area to be painted and wrap the key areas for protection;

[0007] Step 2: sandblast the propeller area to be painted;

[0008] Step 3, spraying the area of ​​the propeller to be painted;

[0009] Step 4: After spraying, remove the propeller protection.

[0010] Preferably, step 1 at least includes the following steps:

[0011] Step 1.1, set up scaffolding around the propeller to meet the requirements of sandblasting, painting and wind and rain protection in an enclosed state;

[0012] Step 1.2: Clean the propeller until there is no obvious oil stain and it is clean and dry to the touch;

[0013] Step 1.3, bandage and protect the key areas, including the anti-sounding edge, blade swirl area, tail shaft seal, oiling nozzle and inspection port;

[0014] Step 1.4: Abrasive preparation: Use high-purity non-metallic abrasive for sandblasting operations.

[0015] Preferably, in step 1.4, the abrasive used is high-purity garnet with a particle size of 50-60 mesh.

[0016] Preferably, in step 2, the sandblasting pressure is 0.6 MPA-0.8 MPA, and the roughness requirement after sandblasting is 50 μm-75 μm.

[0017] Preferably, in step 3, a high-pressure airless spray pump is used to spray paint the entire area to be coated.

[0018] Preferably, in step 3, the pressure of the high-pressure airless paint spray pump is controlled at 0.2MPA-0.3MPA.

[0019] Preferably, in step 3, the coating sprayed is at least one layer of graphene.

[0020] Preferably, in step 3, during the graphene coating spraying process, the film thickness of each layer of graphene coating is at least 100 μm.

[0021] Preferably, in step 3, the painting construction environment conditions meet the requirements that the relative humidity of the air is less than or equal to 85% and the substrate temperature is greater than or equal to the dew point of 3°C.

[0022] Preferably, in step 4, after spraying is completed, the key area protection is removed and the propeller is protected as a whole.

[0023] Remove the scaffolding and carry out waterproofing and undocking after drying for 48 hours.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The present invention provides a ship propeller coating method, which can reduce the attachment of marine organisms to the propeller by spraying multiple layers of graphene paint coating on the propeller surface, enhance the anti-corrosion ability of the propeller, and thus improve the propulsion efficiency and service life of the propeller. In the present invention, the graphene coating can reduce noise and vibration in the low-frequency region and reduce noise emissions, and the graphene coating used in the present invention is an environmentally friendly coating, does not release harmful toxins or biocides, and does not pollute the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a flow chart of the ship propeller coating method of the present invention;

[0027] Figure 2 The figure is a flow chart of the three-step coating process for a ship propeller in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] like Figure 1 As shown, the technical solution of the present invention provides a method for coating a ship propeller. Since the propeller graphene spraying is a special coating, it has high requirements for surface treatment. At the same time, the propeller is a key mechanical equipment of the ship, and the casting process and process are complicated. It is a precious precision casting, and the texture is softer than carbon steel, so the spraying process needs to be designed. Therefore, the ship propeller coating method provided by the present invention includes the following steps:

[0030] Step 1: Clean the propeller area to be painted and wrap the key areas for protection;

[0031] Step 2: sandblast the propeller area to be painted;

[0032] Step 3, spraying the area of ​​the propeller to be painted;

[0033] Step 4: After spraying, remove the propeller protection.

[0034] In one embodiment of the present invention, a method for cleaning the area to be coated and bandaging the key area for protection in step 1 is provided, which is as follows:

[0035] Step 1.1, Scaffolding erection: According to the requirements of graphene coating construction, scaffolding that meets the requirements of sandblasting, painting and wind and rain sheltering in a closed state is erected around the propeller. Sufficient clearance between the scaffolding and the propeller surface is reserved for passage and construction, and the scaffolding is confirmed to be safe and reliable;

[0036] Step 1.2, cleaning the propeller: Use a high-pressure cleaner and oil dispersant to clean the propeller surface. After cleaning, there should be no obvious oil stains, and the touch should be clean and dry. The salt concentration should be less than 50mg / m 2 ;

[0037] Step 1.3, key area protection: The anti-singing edge, blade gyration area, tail shaft seal, oiling nozzle, inspection port and other parts must be protected before formal construction. Use cloth-based tape to protect the anti-singing edge and blade gyration area. The anti-singing edge treatment of propellers during production and processing is very meticulous. Sandblasting may cause the shape of the propeller's anti-singing edge to be destroyed, thereby affecting the propeller's anti-singing performance. Protection here is particularly important. In addition, use three-proof cloth to protect the tail shaft seal and use cement to protect the oiling nozzle and inspection port;

[0038] Step 1.4, abrasive preparation: Graphene spraying is a special coating with high requirements for surface treatment. At the same time, propellers are key mechanical equipment for ships, and the casting process and process are complicated. They are precious precision castings, and the texture is softer than carbon steel. Using conventional abrasives to treat the surface is easy to cause damage, and high-purity non-metallic abrasives are required for sandblasting. In this embodiment, according to the samples provided by the abrasive manufacturer, product characteristics, and local sandblasting test results, red high-purity garnet (particle size 50-60 mesh) is used.

[0039] In one embodiment of the present invention, a method for sandblasting the area to be coated in step 2 is provided, which is as follows:

[0040] During sandblasting, construction workers need to test the gun first, adjust it to the best state, and then select the spray angle for sandblasting. The order of sandblasting should be based on the principle of first bottom and then top, first edge and then middle. The sandblasting pressure is controlled at about 0.7MPA, and the roughness after sandblasting is required to be 50μm-75μm. After sandblasting, the surrounding area should be cleaned and the abrasive in the scaffolding gap should be blown away. The scaffolding springboard needs to be protected with a film to prevent particle pollution during construction.

[0041] In one embodiment of the present invention, a method for spraying the area to be coated in step 3 is provided. In this embodiment, the coating used is graphene, and at least one coat is sprayed. The following takes spraying three coats of graphene coating as an example to further illustrate the spraying method provided in this embodiment. Figure 2 As shown, the three-layer graphene coating spraying method provided in this embodiment specifically includes the following steps:

[0042] Step 3.1, apply the first coat of paint: graphene primer, first pre-coat the sharp edges and areas that are difficult to spray or where the film thickness cannot be achieved, then use a high-pressure airless spray pump to spray the entire area to be painted, and ensure that the film thickness of the first coat of paint reaches 100μm; in this step, first use a new wool roller and wool brush to pre-coat the sharp edges and areas that are difficult to spray or where the film thickness cannot be achieved. The pre-coated film should be thin rather than thick. When using a wool brush for pre-coating of graphene paint, it cannot be smoothed back and forth in both directions, but can only be brushed in one direction to avoid peeling or warping of the coating;

[0043] Step 3.2, apply the second coat of paint: Graphene primer, no pre-coating is required, directly use a high-pressure airless spray pump to spray the second coat of paint on the entire area to be painted, and ensure that the film thickness of the second coat of paint reaches 100μm;

[0044] Step 3.3, apply the third coat of paint: graphene topcoat, no pre-coating is required, directly use a high-pressure airless spray pump to spray the third coat of paint on the entire area to be painted, and ensure that the film thickness of the third coat of paint reaches 100μm.

[0045] As a further optimization of the above embodiment, in step 3.1 to step 3.3, the graphene coating has a faster curing time, and the paint stirring should be performed no more than 15 minutes before use. Prepare a smooth test gun plate before spraying, familiarize yourself with the gun movement, and avoid sagging. The painting construction environment conditions meet the requirements that the relative humidity of the air is less than or equal to 85% and the substrate temperature is greater than or equal to the dew point of 3°C. The pressure of the high-pressure airless paint spray pump is controlled at about 0.25MPA. After each spraying, the equipment must be cleaned with a thinner to ensure that the paint will not solidify in the paint pump, spray gun and pipeline.

[0046] In one embodiment of the present invention, in step 4, the propeller protective material after spraying is removed, specifically as follows:

[0047] After the three coats of paint have dried, first remove the protective material, clean the edges and glue edges, and then protect the propeller as a whole.

[0048] The protective material must be clean and tidy. Do not use the old oily three-proof cloth used for protection before sandblasting to avoid contaminating the blades.

[0049] After the protection is completed, the scaffolding should be removed as soon as possible, and the paint should not be damaged during the removal.

[0050] After the propeller topcoat is applied, it needs to dry for 48 hours before it can be waterproofed and undocking.

[0051] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for coating a ship propeller, characterized in that: The coating method comprises the following steps: Step 1: Clean the propeller area to be painted and wrap the key areas for protection; Step 2: sandblast the propeller area to be painted; Step 3, spraying the area of ​​the propeller to be painted; Step 4: After spraying, remove the propeller protection.

2. A method for coating a ship propeller according to claim 1, characterized in that: The step 1 at least comprises the following steps: Step 1.1, set up scaffolding around the propeller to meet the requirements of sandblasting, painting and wind and rain protection in an enclosed state; Step 1.2: Clean the propeller until there is no obvious oil stain and it is clean and dry to the touch; Step 1.3, bandage and protect the key areas, including the anti-sounding edge, blade swirl area, tail shaft seal, oiling nozzle and inspection port; Step 1.4: Abrasive preparation: Use high-purity non-metallic abrasive for sandblasting operations.

3. A method for coating a ship propeller according to claim 2, characterized in that: In the step 1.4, the abrasive used is high-purity garnet with a particle size of 50-60 mesh.

4. A method for coating a ship propeller according to claim 1, characterized in that: In the step 2, the sandblasting pressure is 0.6MPA-0.8MPA, and the roughness requirement after sandblasting is 50μm-75μm.

5. A method for coating a ship propeller according to claim 1, characterized in that: In step 3, a high-pressure airless spray pump is used to spray paint the entire area to be painted.

6. A method for coating a ship propeller according to claim 5, characterized in that: In step 3, the pressure of the high-pressure airless paint spray pump is controlled at 0.2MPA-0.3MPA.

7. A method for coating a ship propeller according to claim 6, characterized in that: In the step 3, the coating sprayed is at least one layer of graphene.

8. A method for coating a ship propeller according to claim 7, characterized in that: In the step 3, during the graphene coating spraying process, the film thickness of each layer of graphene coating is at least 100 μm.

9. A method for coating a ship propeller according to claim 8, characterized in that: In step 3, the painting construction environment conditions meet the requirements that the relative humidity of the air is less than or equal to 85% and the substrate temperature is greater than or equal to the dew point of 3°C.

10. A method for coating a ship propeller according to claim 1, characterized in that: In step 4, after spraying is completed, the key area protection is removed, the propeller is protected as a whole, the scaffolding is removed, and the waterproofing is carried out after drying for 48 hours.

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