A method for cleaning bakelite surface for aircraft

Abstract

The present invention provides a method for cleaning the surface of bakelite for aircraft, belonging to the field of aviation manufacturing and maintenance technology. The method uses glycerol, dimethyl carbonate, and diethylene glycol as colloidal solvents, adds talcum powder, and then uses walnut sand as an abrasive to mix and form a paste with grinding properties. The paste is then used to grind the surface of aircraft bakelite to remove surface attachments and reduce scratches on the bakelite surface. The aircraft bakelite grinding paste prepared by the method of the present invention is in a colloidal state, so the grinding paste will not flow around during use, reducing material loss. At the same time, the several chemical raw materials are non-toxic during and after the preparation process, and the preparation method is simple, the equipment and conditions involved are simple, and the roughness of the bakelite surface can be guaranteed after operation without damaging the bakelite appearance.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation manufacturing and maintenance, and relates to a method for cleaning the surface of bakelite used in aircraft. Background Art

[0002] During aircraft maintenance, many electrical system components are insulated with Bakelite, which is often covered with adhesive paper and varnished labels for easy identification. Cleaning often involves wiping with acetone, but acetone is unstable and should be removed with a small amount of cotton wool dipped in each wipe. Wait for the acetone to evaporate before reapplying. Excessive use of acetone can generate static electricity, which can easily ignite and cause fires. Acetone is also highly volatile, posing a health risk to operators. Using acidic or alkaline cleaning agents can corrode the metal or non-metallic materials bonded to the Bakelite and is therefore generally not recommended. Summary of the Invention

[0003] In response to the above problems, the present invention proposes a method for cleaning the surface of bakelite used in aircraft. The method uses glycerol, dimethyl carbonate and diethylene glycol as colloidal solvents, adds talcum powder, and then uses walnut sand as an abrasive to mix them into a paste with grinding properties. The paste is then used to grind the surface of the aircraft bakelite to remove attachments on the bakelite surface and improve the cleaning efficiency of the bakelite surface.

[0004] The technical solutions of the present invention are as follows:

[0005] A method for cleaning the surface of bakelite for aircraft comprises the following steps:

[0006] 1) Select walnut sand abrasive: 100-200 mesh;

[0007] 2) Preparation of grinding colloid:

[0008] 2.1) First, thoroughly mix glycerol and an equal amount of dimethyl carbonate at a temperature of 35-50°C, and then place the mixture in a heating box at 50-70°C and heat continuously for 6 hours.

[0009] 2.2) Then, 20 g of diethylene glycol and 30 g of talc were added per 100 ml of the solution prepared in step 2.1), mixed and stirred thoroughly at room temperature until the entire solution became colloidal, thereby obtaining a ground colloid.

[0010] 3) Adding the walnut sand abrasive from step 1) to the grinding colloid and mixing them evenly; wherein the mass percentage of the walnut sand abrasive to the grinding colloid is 25% to 35% of walnut sand and 65% to 75% of grinding colloid.

[0011] 4) Dip absorbent cotton in abrasive colloid to grind the surface of bakelite to remove any attachments on the surface.

[0012] The beneficial effects of the present invention are as follows: the aircraft bakelite grinding paste prepared by the method of the present invention is in a colloid state, so the grinding paste will not flow around during use, thereby reducing material loss; at the same time, the several chemical raw materials are non-toxic during and after the preparation process, and the preparation method is simple, and the equipment and conditions involved are simple, which can ensure the cleaning efficiency of the bakelite surface. DETAILED DESCRIPTION

[0013] The specific implementation of the present invention is described in detail below in conjunction with the technical solution.

[0014] The present invention provides a method for cleaning the surface of bakelite for aircraft, comprising the following steps:

[0015] 1) Select walnut sand abrasive: 100 mesh;

[0016] 2) Preparation of grinding colloid:

[0017] 2.1) Glycerol and an equal amount of dimethyl carbonate were thoroughly stirred and mixed at 40°C. The mixture was then heated in a 65°C heating oven for 6 hours to allow for a more complete gelatinization reaction between the glycerol and dimethyl carbonate, resulting in a mixture with a more suitable viscosity.

[0018] 2.2) 20g of diethylene glycol and 30g of talc were then added to every 100ml of the solution prepared in step 2.1), and the mixture was stirred thoroughly at room temperature for 15 minutes to form a colloidal solution, thereby obtaining an abrasive colloid. This raw material combination and preparation method maximized the ratio of liquid-supported silicon carbide abrasive to talc at equal volumes, resulting in a polishing paste with improved abrasive performance and lubricity. Furthermore, the resulting paste exhibited excellent stability, with no abrasive precipitation or stratification observed after prolonged storage.

[0019] 3) Adding the walnut sand abrasive from step 1) to the grinding colloid and mixing them evenly; wherein the mass percentage of the walnut sand abrasive to the grinding colloid is 30% walnut sand and 70% grinding colloid.

[0020] 4) Dip absorbent cotton in abrasive colloid to grind the surface of bakelite to remove any attachments on the surface.

[0021] Example 1: Comparison of effective operation time for cleaning bakelite labels

[0022] Based on the on-site work situation, the labels on the aircraft that frequently need to be cleaned are identified, and then multiple experienced operators are selected to take turns cleaning the same work content. The acetone cleaning method and the method provided by the present invention are compared to find out which method can better improve work efficiency and reduce working time.

[0023] Operators: Select 10 fitter operators with more than 5 years of repair experience.

[0024] Operation objects: 10 operators were asked to clean bakelite using acetone and the method provided by the present invention, respectively. The operation objects were all 10 bakelite samples with the same bonding state.

[0025] Operating Environment: Select a room temperature work area with an indoor temperature of 20°C to 23°C, a humidity of 50% to 75%, and an illumination of 600 lx. The temperature, humidity, and illumination should all meet the normal aircraft disassembly and repair requirements.

[0026] The comparison of the cleaning effect of acetone and the cleaning effect of the method of the present invention is shown in Table 1.

[0027] Table 1

[0028] Operator Acetone cleanup time This patent provides the time taken for cleaning Operator A 45 minutes 22 minutes Operator B 40 minutes 20 minutes Operator C 38 minutes 20 minutes Operator D 44 minutes 18 minutes Operator E 45 minutes 19 minutes Operator F 48 minutes 21 minutes Operator G 42 minutes 24 minutes Operator H 46 minutes 23 minutes Operator I 45 minutes 22 minutes Operator J 44 minutes 24 minutes

[0029] Through actual comparison, it was found that the efficiency of cleaning bakelite using the method of the present invention is significantly higher than the efficiency of cleaning with acetone.

Claims

1. A method for cleaning the surface of bakelite for aircraft, characterized in that: The method comprises the following steps: 1) Select walnut sand abrasive; 2) preparing a grinding colloid; 3) adding the walnut sand abrasive from step 1) to the ground colloid obtained from step 2) and mixing them evenly; wherein the mass percentage of the walnut sand abrasive to the ground colloid is 25% to 35% walnut sand and 65% to 75% ground colloid; 4) Dipping the abrasive colloid into the surface of the bakelite and grinding it to remove the attachments on the surface of the bakelite; The preparation method of step 2) is as follows: 2.1) First, thoroughly mix glycerol and dimethyl carbonate of equal weight at 35-50°C, then place in a heating oven at 50-70°C and heat continuously for 6 hours; 2.2) Then, 20 g of diethylene glycol and 30 g of talc were added per 100 ml of the solution prepared in step 2.1), mixed and stirred thoroughly at room temperature until the entire solution became colloidal, thereby obtaining a ground colloid.

2. A method for cleaning the surface of bakelite for aircraft according to claim 1, characterized in that: In the step 1), the walnut sand abrasive is 100-200 mesh.