A low-friction wear-resistant coating, its preparation method and coating layer

Abstract

This invention provides a low-friction, wear-resistant coating, its preparation method, and the coating itself, belonging to the field of coatings. The technical solution is as follows: the low-friction, wear-resistant coating is made from the following raw materials: 10-60g of polyacrylate resin, 0.2-6g of modified candle ash, 1.25-20g of curing agent, 20-80g of solvent, 0.5-5g of leveling agent, and 0.5-5g of defoamer. The beneficial effects of this invention are: by modifying the surface of the candle ash, the surface-modified candle ash is added to the polyacrylate coating as a lubricating additive, which prevents the agglomeration of candle ash in the coating. The resulting low-friction coating has a lower coefficient of friction and better lubricity.

Description

Technical Field

[0001] This invention relates to the field of coatings, and more particularly to a low-friction wear-resistant coating, its preparation method, and the coating itself. Background Technology

[0002] Coating materials serve to modify and protect the substrate. Polyacrylate coatings, as a widely used coating material on the surface of objects, can suffer surface damage due to external forces such as friction during use. Candle ash, as a carbon material, has a lubricating effect, but it tends to agglomerate in polyacrylate coatings and is not easy to disperse, thus failing to achieve good friction reduction performance of the coating. Summary of the Invention

[0003] The purpose of this invention is to provide a low-friction wear-resistant coating and its preparation method and coating, which modifies the surface of candle ash and adds the surface-modified candle ash to a polyacrylate coating as a lubricating additive to prevent the agglomeration of candle ash in the coating, thereby reducing the coefficient of friction of the prepared low-friction coating surface.

[0004] This invention is achieved through the following measures:

[0005] A low-friction wear-resistant coating, characterized in that the low-friction wear-resistant coating is made from the following raw materials: 10-60g of polyacrylate resin, 0.2-6g of modified candle ash, 1.25-20g of curing agent, 20-80g of solvent, 0.5-5g of leveling agent and 0.5-5g of defoamer.

[0006] The invention also has the following specific features:

[0007] The polyacrylate resin is a hydroxyl-containing polyacrylate resin, the curing agent is isocyanate, the solvent is toluene solution, the leveling agent is BYK-333, and the defoamer is BYK-141.

[0008] The low-friction wear-resistant coating is made from the following raw materials: 28g polyacrylate resin, 1.4g modified candle ash, 6g curing agent, 63.6g solvent, 0.5g leveling agent and 0.5g defoamer.

[0009] The modification method for the modified candle ash includes the following steps:

[0010] S1. Place the glass slide above the burning candle and collect the candle ash particles deposited on the surface of the glass slide into a beaker.

[0011] S2. The candle ash particles collected in step S1 were calcined at 450℃ for 4 hours. After calcination, water was added and dispersed in ultrasound (10g of calcined candle ash was added to 100g of water and dispersed in ultrasound for 10 minutes). 0.05mol of nitric acid was added to the dispersed candle ash aqueous solution and the candle ash was treated under heating conditions (refluxed at 110℃ for 12 hours). The treated candle ash was washed twice with water until neutral. The candle ash was then centrifuged from the aqueous solution and dried in an oven to obtain 9.6g of nitric acid-treated candle ash.

[0012] S3. Add 9.6g of dried candle ash from step S2 to 100ml of toluene solution, add 3g of ethyl isocyanate acrylate and 0.3g of dibutyltin dilaurate, treat at 80℃ for 6h, and centrifuge to filter out solid candle ash particles.

[0013] S4. The solid particles of candle ash were dried in a forced-air drying oven at 60°C for 12 hours to obtain modified candle ash with acrylate groups on the surface.

[0014] The preparation method is as follows: polyacrylate resin modified candle ash solvent, leveling agent and defoamer are uniformly mixed, and then mixed evenly with curing agent.

[0015] The low-friction wear-resistant coating is made by uniformly mixing polyacrylate resin, modified candle ash, isocyanate curing agent, toluene, leveling agent, and defoamer, and then spraying it with an air spray gun to form a low-friction wear-resistant coating.

[0016] A method for modifying candle ash, characterized by comprising the following steps:

[0017] S1. Place the glass slide above the burning candle and collect the candle ash particles deposited on the surface of the glass slide into a beaker.

[0018] S2. The candle ash particles collected in step S1 are calcined at high temperature. After calcination, water is added and dispersed in ultrasound. Nitric acid is added to the dispersed candle ash aqueous solution and the candle ash is treated under heating conditions. The treated candle ash is washed with water until neutral. Then the candle ash is centrifuged from the aqueous solution and dried in an oven.

[0019] S3. Add the dried candle ash from step S2 to a toluene solution, add ethyl isocyanate and dibutyltin dilaurate, treat under heating, and centrifuge to filter out the solid particles of candle ash.

[0020] S4. The solid particles of candle ash are dried in a forced-air drying oven to obtain modified candle ash with acrylate groups on the surface.

[0021] A method for modifying candle ash, characterized in that the modified candle ash is prepared by a modification method.

[0022] The beneficial effects of this invention are as follows: This invention modifies the surface of candle ash, and adds the surface-modified candle ash to the polyacrylate coating as a lubricating additive for the coating. This can prevent the agglomeration of candle ash in the coating, and the friction coefficient of the prepared low-friction coating surface is reduced, resulting in better lubricity. Attached Figure Description

[0023] Figure 1 This is a SEM image of the friction experiment in Example 2 of the present invention.

[0024] Figure 2 This is a SEM image of the friction experiment in Example 3 of the present invention.

[0025] Figure 3 This is a SEM image of the friction experiment in Example 4 of the present invention.

[0026] Figure 4 This is a SEM image of the friction experiment in Example 5 of the present invention.

[0027] Figure 5 This is a SEM image of the friction experiment in Example 6 of the present invention. Detailed Implementation

[0028] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0029] Example 1

[0030] A low-friction, wear-resistant coating is made from the following raw materials: 10-60g of polyacrylate resin, 0.2-6g of modified candle ash, 1.25-20g of curing agent, 20-80g of solvent, 0.5-5g of leveling agent and 0.5-5g of defoamer.

[0031] The polyacrylate resin is a hydroxyl-containing polyacrylate resin, the curing agent is isocyanate, the solvent is toluene solution, the leveling agent is BYK-333, and the defoamer is BYK-141.

[0032] The low-friction wear-resistant coating is made from the following raw materials: 28g polyacrylate resin, 1.4g modified candle ash, 6g curing agent, 63.6g solvent, 0.5g leveling agent and 0.5g defoamer.

[0033] The modification method for the modified candle ash includes the following steps:

[0034] S1. Place the glass slide above the burning candle and collect the candle ash particles deposited on the surface of the glass slide into a beaker.

[0035] S2. The candle ash particles collected in step S1 were calcined at 450℃ for 4 hours. After calcination, water was added and dispersed in ultrasound (10g of calcined candle ash was added to 100g of water and dispersed in ultrasound for 10 minutes). 0.05mol of nitric acid was added to the dispersed candle ash aqueous solution and the candle ash was treated under heating conditions (refluxed at 110℃ for 12 hours). The treated candle ash was washed twice with water until neutral. The candle ash was then centrifuged from the aqueous solution and dried in an oven to obtain 9.6g of nitric acid-treated candle ash.

[0036] S3. Add 9.6g of dried candle ash from step S2 to 100ml of toluene solution, add 3g of ethyl isocyanate acrylate and 0.3g of dibutyltin dilaurate, treat at 80℃ for 6h, and centrifuge to filter out solid candle ash particles.

[0037] S4. The solid particles of candle ash were dried in a forced-air drying oven at 60°C for 12 hours to obtain modified candle ash with acrylate groups on the surface.

[0038] The preparation method is as follows: polyacrylate resin modified candle ash solvent, leveling agent and defoamer are uniformly mixed, and then mixed evenly with curing agent.

[0039] The low-friction wear-resistant coating is made by uniformly mixing polyacrylate resin, modified candle ash, isocyanate curing agent, toluene, leveling agent, and defoamer, and then spraying it with an air spray gun to form a low-friction wear-resistant coating.

[0040] A method for modifying candle ash includes the following steps:

[0041] S1. Place the glass slide above the burning candle and collect the candle ash particles deposited on the surface of the glass slide into a beaker.

[0042] S2. The candle ash particles collected in step S1 are calcined at high temperature. After calcination, water is added and dispersed in ultrasound. Nitric acid is added to the dispersed candle ash aqueous solution and the candle ash is treated under heating conditions. The treated candle ash is washed with water until neutral. Then the candle ash is centrifuged from the aqueous solution and dried in an oven.

[0043] S3. Add the dried candle ash from step S2 to a toluene solution, add ethyl isocyanate and dibutyltin dilaurate, treat under heating, and centrifuge to filter out the solid particles of candle ash.

[0044] S4. The solid particles of candle ash are dried in a forced-air drying oven to obtain modified candle ash with acrylate groups on the surface.

[0045] A modification method for preparing modified candle ash, wherein the modified candle ash is prepared by the modification method.

[0046] Example 2

[0047] Mix 28g of polyacrylate resin, 1.4g of modified candle ash, 6g of isocyanate curing agent, 63.6g of toluene, 0.5g of leveling agent, and 0.5g of defoamer evenly, and spray the mixture onto the steel block using an air spray gun. Cure at room temperature for 7 days to obtain a low-friction and wear-resistant coating.

[0048] Example 3

[0049] Mix 28g of polyacrylate resin, 0.56g of modified candle ash, 6g of isocyanate curing agent, 64.44g of toluene, 0.5g of leveling agent, and 0.5g of defoamer evenly, and spray the mixture onto the steel block using an air spray gun. Cure at room temperature for 7 days to obtain a low-friction wear-resistant coating.

[0050] Example 4

[0051] Mix 28g of polyacrylate resin, 2.8g of modified candle ash, 6g of isocyanate curing agent, 62.2g of toluene, 0.5g of leveling agent, and 0.5g of defoamer evenly, and spray the mixture onto the steel block using an air spray gun. Cure at room temperature for 7 days to obtain a low-friction wear-resistant coating.

[0052] Comparative Example 5

[0053] Mix 28g of polyacrylate resin, 1.4g of candle ash, 6g of isocyanate curing agent, 63.6g of toluene, 0.5g of leveling agent, and 0.5g of defoamer evenly, and spray the mixture onto the steel block using an air spray gun. Cure at room temperature for 7 days to obtain a low-friction wear-resistant coating.

[0054] Comparative Example 6

[0055] Mix 28g of polyacrylate resin, 6g of isocyanate curing agent, 65g of toluene, 0.5g of leveling agent, and 0.5g of defoamer evenly, and spray the mixture onto the steel block using an air spray gun. Cure at room temperature for 7 days to obtain a low-friction and wear-resistant coating.

[0056] The low-friction wear-resistant coatings formed in Examples 2, 3, 4, 5, and 6 were subjected to friction tests (friction test conditions: linear reciprocating friction test on a friction testing machine, stroke of 2 mm, applied force of 2 N, friction ball is silicon nitride ceramic ball with diameter of 6 mm), and the following results were obtained:

[0057]

[0058] As shown in the table, compared with the coatings without added candle ash and those with added unmodified candle ash, the coefficient of friction of the coating with added modified candle ash was significantly reduced, indicating that the coating with added modified candle ash has better low-friction performance.

[0059] Depend on Figure 1-5 It can be seen that the wear marks of the coating with added unmodified candle ash are smaller than those of the coating without added candle ash. Compared with the coating with added unmodified candle ash, the wear marks of the coating with added modified candle ash are significantly smaller, indicating that it has a better anti-wear effect. During the friction process, the lamellar structure of the candle ash can be peeled off to form a lubricating film on the surface, which reduces the coefficient of friction of the coating surface, achieves low friction performance, and reduces the degree of friction on the coating surface. After surface modification, the candle ash can be more uniformly dispersed in the polyacrylate resin, thereby achieving better low friction and low wear performance.

[0060] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A low-friction, wear-resistant coating, characterized in that, The low-friction wear-resistant coating is made from the following raw materials: 10-60g of polyacrylate resin, 0.2-6g of modified candle ash, 1.25-20g of curing agent, 20-80g of solvent, 0.5-5g of leveling agent and 0.5-5g of defoamer; The modification method for the modified candle ash includes the following steps: S1. Place the glass slide above the burning candle and collect the candle ash particles deposited on the surface of the glass slide into a beaker. S2. The candle ash particles collected in step S1 are calcined at high temperature. After calcination, water is added and dispersed in ultrasound. Nitric acid is added to the dispersed candle ash aqueous solution and the candle ash is treated under heating conditions. The treated candle ash is washed with water until neutral. Then the candle ash is centrifuged from the aqueous solution and dried in an oven. S3. Add the dried candle ash from step S2 to a toluene solution, add ethyl isocyanate and dibutyltin dilaurate, treat under heating, and centrifuge to filter out the solid particles of candle ash. S4. The solid particles of candle ash are dried in a forced-air drying oven to obtain modified candle ash with acrylate groups on the surface.

2. The low-friction wear-resistant coating according to claim 1, characterized in that, The polyacrylate resin is a hydroxyl-containing polyacrylate resin, the curing agent is isocyanate, and the solvent is toluene solution.

3. The low-friction wear-resistant coating according to claim 2, characterized in that, The low-friction wear-resistant coating is made from the following raw materials: 28g polyacrylate resin, 1.4g modified candle ash, 6g curing agent, 63.6g solvent, 0.5g leveling agent and 0.5g defoamer.

4. The low-friction wear-resistant coating according to any one of claims 1 to 3, characterized in that, The coating is prepared by uniformly mixing polyacrylate resin, modified candle ash solvent, leveling agent and defoamer, and then uniformly mixing with curing agent.

5. The low-friction wear-resistant coating obtained by the low-friction wear-resistant coating of claim 4.

6. A method for modifying candle ash, characterized in that, Includes the following steps: S1. Place the glass slide above the burning candle and collect the candle ash particles deposited on the surface of the glass slide into a beaker. S2. The candle ash particles collected in step S1 are calcined at high temperature. After calcination, water is added and dispersed in ultrasound. Nitric acid is added to the dispersed candle ash aqueous solution and the candle ash is treated under heating conditions. The treated candle ash is washed with water until neutral. Then the candle ash is centrifuged from the aqueous solution and dried in an oven. S3. Add the dried candle ash from step S2 to a toluene solution, add ethyl isocyanate and dibutyltin dilaurate, treat under heating, and centrifuge to filter out the solid particles of candle ash. S4. The solid particles of candle ash are dried in a forced-air drying oven to obtain modified candle ash with acrylate groups on the surface.

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