Low-friction wear-resistant paint and preparation method and coating thereof

Abstract

The invention provides a low-friction wear-resistant coating, a preparation method thereof and a coating, and belongs to the field of coatings. According to the technical scheme, the low-friction wear-resistant coating is prepared from the following raw materials: 10-60 g of polyacrylate resin, 0.2-6 g of modified candle ash, 1.25-20 g of a curing agent, 20-80 g of a solvent, 0.5-5 g of a leveling agent and 0.5-5 g of a defoaming agent. The low-friction coating has the beneficial effects that the surface of the candle ash is modified, the candle ash subjected to surface modification is added into the polyacrylate coating to serve as a lubricating additive of the coating, agglomeration of the candle ash in the coating can be prevented, the friction coefficient of the surface of the prepared low-friction coating is reduced, and the prepared low-friction coating has good lubricity.

Description

Technical Field

[0001] The invention relates to the field of coatings, and in particular to a low-friction and wear-resistant coating and a preparation method and coating thereof. Background Art

[0002] Coating materials have the function of modifying and protecting the substrate. Polyacrylate coating is a coating material widely used on the surface of objects. During its use, it will be damaged due to the action of external forces such as friction. Candle ash, as a carbon material, has a lubricating effect, but candle ash is easy to agglomerate in polyacrylate coating and is not easy to disperse, so the coating cannot achieve good friction reduction performance. Summary of the invention

[0003] The purpose of the present invention is to provide a low-friction and wear-resistant coating having good lubricity, wherein the surface of candle ash is modified and the surface-modified candle ash is added to a polyacrylate coating as a lubricating additive of the coating, thereby preventing the candle ash from agglomerating in the coating. The friction coefficient of the prepared low-friction coating surface is reduced, and the coating has a preparation method thereof and a low-friction and wear-resistant coating.

[0004] The present invention is achieved by the following measures: A low-friction and wear-resistant coating, characterized in that the low-friction and wear-resistant coating is made of 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 defoaming agent.

[0005] The specific features of the present invention also include: The polyacrylate resin is a polyacrylate resin containing hydroxyl groups, the curing agent is isocyanate, the solvent is a toluene solution, the leveling agent is BYK-333, and the defoaming agent is BYK-141.

[0006] The low-friction and wear-resistant coating is made of the following raw materials: 28 g of polyacrylate resin, 1.4 g of modified candle ash, 6 g of curing agent, 63.6 g of solvent, 0.5 g of leveling agent and 0.5 g of defoaming agent.

[0007] The modification method of the modified candle ash comprises the following steps: S1. Place a glass slide above a burning candle, collect the candle ash particles deposited on the surface of the glass slide, and collect the candle ash particles into a beaker; S2, calcining the candle ash particles collected in step S1 at 450°C for 4h, adding water after calcination to disperse in ultrasound (taking 10g of calcined candle ash, adding it to 100g of water, and dispersing it in ultrasound for 10min), adding 0.05mol of nitric acid to the dispersed candle ash aqueous solution, treating the candle ash under heating conditions (refluxing at 110°C for 12h to treat the candle ash), washing the treated candle ash twice with water until it is neutral, then centrifuging the candle ash from the aqueous solution, and drying it in an oven to obtain 9.6g of candle ash treated with nitric acid; S3, adding 9.6 g of the candle ash dried in step S2 to 100 ml of toluene solution, adding 3 g of ethyl isocyanate acrylate and 0.3 g of dibutyltin dilaurate, treating at 80° C. for 6 h, and centrifuging to remove the candle ash solid particles; S4. Dry the candle ash solid particles in a 60° C. forced air drying oven for 12 h to obtain modified candle ash with surfaces modified with acrylate groups.

[0008] The preparation method comprises the following steps: uniformly mixing a polyacrylate resin modified candle ash solvent, a leveling agent and a defoaming agent, and then uniformly mixing the solvent with a curing agent.

[0009] The low-friction and wear-resistant coating is made by evenly mixing polyacrylate resin, modified candle ash, isocyanate curing agent, toluene, leveling agent and defoaming agent, and then spraying with an air spray gun to form a low-friction and wear-resistant coating.

[0010] A modification method for modified candle ash, characterized in that it comprises the following steps: S1. Place a glass slide above a burning candle, collect the candle ash particles deposited on the surface of the glass slide, and collect the candle ash particles into a beaker; S2, calcining the candle ash particles collected in step S1 at high temperature, adding water after calcination to disperse in ultrasound, adding nitric acid to the dispersed candle ash aqueous solution, treating the candle ash under heating conditions, washing the treated candle ash with water until it is neutral, then centrifuging the candle ash from the aqueous solution, and drying it in an oven; S3, adding the candle ash dried in step S2 to a toluene solution, adding ethyl isocyanate acrylate and dibutyltin dilaurate, treating under heating, and centrifugally filtering out the candle ash solid particles; S4. Drying the candle ash solid particles in a forced air drying oven to obtain modified candle ash with surfaces modified with acrylate groups.

[0011] A modification method for modified candle ash, characterized in that the modified candle ash is prepared by the modification method.

[0012] The beneficial effects of the present invention are as follows: the surface of candle ash is modified and the surface-modified candle ash is added to the polyacrylate coating as a lubricating additive of the coating, which can prevent the candle ash from agglomerating in the coating. The friction coefficient of the surface of the prepared low-friction coating is reduced and has better lubricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the SEM image after the friction test of Example 2 of the present invention.

[0014] Figure 2 This is the SEM image after the friction test of Example 3 of the present invention.

[0015] Figure 3 This is the SEM image of Example 4 of the present invention after the friction test.

[0016] Figure 4 This is the SEM image after the friction test of Example 5 of the present invention.

[0017] Figure 5 This is the SEM image after the friction test of Example 6 of the present invention. DETAILED DESCRIPTION

[0018] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0019] Example 1 A low-friction wear-resistant coating is prepared 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 defoaming agent.

[0020] The polyacrylate resin is a polyacrylate resin containing hydroxyl groups, the curing agent is isocyanate, the solvent is a toluene solution, the leveling agent is BYK-333, and the defoaming agent is BYK-141.

[0021] The low-friction and wear-resistant coating is made of the following raw materials: 28 g of polyacrylate resin, 1.4 g of modified candle ash, 6 g of curing agent, 63.6 g of solvent, 0.5 g of leveling agent and 0.5 g of defoaming agent.

[0022] The modification method of the modified candle ash comprises the following steps: S1. Place a glass slide above a burning candle, collect the candle ash particles deposited on the surface of the glass slide, and collect the candle ash particles into a beaker; S2, calcining the candle ash particles collected in step S1 at 450°C for 4h, adding water after calcination to disperse in ultrasound (taking 10g of calcined candle ash, adding it to 100g of water, and dispersing it in ultrasound for 10min), adding 0.05mol of nitric acid to the dispersed candle ash aqueous solution, treating the candle ash under heating conditions (refluxing at 110°C for 12h to treat the candle ash), washing the treated candle ash twice with water until it is neutral, then centrifuging the candle ash from the aqueous solution, and drying it in an oven to obtain 9.6g of candle ash treated with nitric acid; S3, adding 9.6 g of the candle ash dried in step S2 to 100 ml of toluene solution, adding 3 g of ethyl isocyanate acrylate and 0.3 g of dibutyltin dilaurate, treating at 80° C. for 6 h, and centrifuging to remove the candle ash solid particles; S4. Dry the candle ash solid particles in a 60° C. forced air drying oven for 12 h to obtain modified candle ash with surfaces modified with acrylate groups.

[0023] The preparation method comprises the following steps: uniformly mixing a polyacrylate resin modified candle ash solvent, a leveling agent and a defoaming agent, and then uniformly mixing the solvent with a curing agent.

[0024] The low-friction and wear-resistant coating is made by evenly mixing polyacrylate resin, modified candle ash, isocyanate curing agent, toluene, leveling agent and defoaming agent, and then spraying with an air spray gun to form a low-friction and wear-resistant coating.

[0025] A modification method for modified candle ash comprises the following steps: S1. Place a glass slide above a burning candle, collect the candle ash particles deposited on the surface of the glass slide, and collect the candle ash particles into a beaker; S2, calcining the candle ash particles collected in step S1 at high temperature, adding water after calcination to disperse in ultrasound, adding nitric acid to the dispersed candle ash aqueous solution, treating the candle ash under heating conditions, washing the treated candle ash with water until it is neutral, then centrifuging the candle ash from the aqueous solution, and drying it in an oven; S3, adding the candle ash dried in step S2 to a toluene solution, adding ethyl isocyanate acrylate and dibutyltin dilaurate, treating under heating, and centrifugally filtering out the candle ash solid particles; S4. Drying the candle ash solid particles in a forced air drying oven to obtain modified candle ash with surfaces modified with acrylate groups.

[0026] The invention discloses a modification method for modified candle ash. The modified candle ash is prepared by the modification method.

[0027] Example 2 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 defoaming agent evenly, spray them onto a steel block using an air spray gun, and cure at room temperature for 7 days to obtain a low-friction and wear-resistant coating.

[0028] Example 3 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 defoaming agent evenly, spray them onto a steel block using an air spray gun, and cure at room temperature for 7 days to obtain a low-friction and wear-resistant coating.

[0029] Example 4 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 defoaming agent evenly, spray them onto a steel block using an air spray gun, and cure at room temperature for 7 days to obtain a low-friction and wear-resistant coating.

[0030] Comparative Example 5 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 defoaming agent evenly, spray them onto a steel block using an air spray gun, and cure at room temperature for 7 days to obtain a low-friction and wear-resistant coating.

[0031] Comparative Example 6 Mix 28g of polyacrylate resin, 6g of isocyanate curing agent, 65g of toluene, 0.5g of leveling agent and 0.5g of defoaming agent evenly, spray them onto a steel block using an air spray gun, and cure at room temperature for 7 days to obtain a low-friction and wear-resistant coating.

[0032] The low friction and 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 tester, with a stroke of 2 mm, an applied force of 2 N, and a friction ball of silicon nitride ceramic ball with a diameter of 6 mm), and the following results were obtained:

[0033] It can be seen from the table that compared with the coating without adding candle ash and adding unmodified candle ash, the friction coefficient of the coating after adding modified candle ash is significantly reduced, indicating that the coating with modified candle ash has better low friction performance.

[0034] Depend on Figure 1-5It can be seen that the wear marks of the coating with unmodified candle ash added are smaller than those of the coating without candle ash added. Compared with the coating with unmodified candle ash added, the wear marks of the coating are significantly smaller after the modified candle ash is added, 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 friction coefficient 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 evenly dispersed in the polyacrylate resin, thereby achieving better low friction and low wear performance.

[0035] Technical features not described in the present invention can be achieved through or by adopting existing technologies and will not be described in detail here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A low friction and wear-resistant coating, characterized in that: The low-friction wear-resistant coating is made of 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 defoaming agent.

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

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

4. The low friction and wear-resistant coating according to claim 3, characterized in that: The modification method of the modified candle ash comprises the following steps: S1. Place a glass slide above a burning candle, collect the candle ash particles deposited on the surface of the glass slide, and collect the candle ash particles into a beaker; S2, calcining the candle ash particles collected in step S1 at high temperature, adding water after calcination to disperse in ultrasound, adding nitric acid to the dispersed candle ash aqueous solution, treating the candle ash under heating conditions, washing the treated candle ash with water until it is neutral, then centrifuging the candle ash from the aqueous solution, and drying it in an oven; S3, adding the candle ash dried in step S2 to a toluene solution, adding ethyl isocyanate acrylate and dibutyltin dilaurate, treating under heating, and centrifugally filtering out the candle ash solid particles; S4. Drying the candle ash solid particles in a forced air drying oven to obtain modified candle ash with surfaces modified with acrylate groups.

5. The low friction and wear-resistant coating according to any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: uniformly mixing a polyacrylate resin modified candle ash solvent, a leveling agent and a defoaming agent, and then uniformly mixing the solvent with a curing agent.

6. A low friction and wear resistant coating made from the low friction and wear resistant coating according to claim 4.

7. A method for modifying candle ash, characterized in that: The following steps are involved: S1. Place a glass slide above a burning candle, collect the candle ash particles deposited on the surface of the glass slide, and collect the candle ash particles into a beaker; S2, calcining the candle ash particles collected in step S1 at high temperature, adding water after calcination to disperse in ultrasound, adding nitric acid to the dispersed candle ash aqueous solution, treating the candle ash under heating conditions, washing the treated candle ash with water until it is neutral, then centrifuging the candle ash from the aqueous solution, and drying it in an oven; S3, adding the candle ash dried in step S2 to a toluene solution, adding ethyl isocyanate acrylate and dibutyltin dilaurate, treating under heating, and centrifugally filtering out the candle ash solid particles; S4. Drying the candle ash solid particles in a forced air drying oven to obtain modified candle ash with surfaces modified with acrylate groups.

8. A method for modifying candle ash, characterized in that: The modified candle ash is prepared by the modification method of claim 4.

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