Wear-resistant powder coating and preparation method and application thereof

Abstract

The application relates to the technical field of powder coating, and particularly discloses a wear-resistant powder coating as well as a preparation method and application thereof. The wear-resistant powder coating provided by the application comprises the following components in parts by weight: 60-80 parts of an epoxy resin, 8-12 parts of a curing agent, 0.3-0.5 parts of cellulose acetate butyrate and 0.2-2.0 parts of polytetrafluoroethylene modified polyethylene wax; the epoxy resin is a bisphenol A epoxy resin and an ortho-cresol formaldehyde epoxy resin with a weight ratio of 1:(0.5-1.5); further, the weight ratio of the bisphenol A epoxy resin and the ortho-cresol formaldehyde epoxy resin is 1:(0.8-1.3); the application further provides a preparation method of the wear-resistant powder coating and a spraying method of the wear-resistant powder coating. The wear-resistant powder coating provided by the application not only has good slip resistance and wear resistance, but also can present a super-large texture effect similar to leather, and has a good application prospect.

Description

Technical Field

[0001] This application relates to the field of powder coating technology, specifically to a wear-resistant powder coating, its preparation method, and its application. Background Technology

[0002] In recent years, powder coating technology has been increasingly widely used in modern industries such as automobile manufacturing and special machinery equipment. With the continuous development of composite materials, the market demand for high-performance powder coatings is also constantly growing. This requires powder coatings not only to meet the basic protective functions of composite materials, but also to possess excellent decorative and functional properties, thereby improving the overall quality of products and user experience.

[0003] Currently, powder coatings used in composite materials primarily improve their performance by adding various fillers and additives. For example, some reports suggest using silane coupling agents to enhance the adhesion between the powder coating and the substrate; others report using nano-silica to improve the coating's hardness and scratch resistance; and still others report using micron-sized ceramic particles to enhance the coating's wear resistance. While these methods can improve the performance of powder coatings to some extent, their effectiveness in anti-slip and wear-resistant properties remains unsatisfactory. Furthermore, existing powder coatings cannot achieve a large, leather-like texture, which limits their use in high-end applications.

[0004] Therefore, there is an urgent need to provide a powder coating that has super anti-slip and wear-resistant properties, and at the same time has a leather-like texture effect, in order to meet a wider range of application needs. Summary of the Invention

[0005] In order to improve the anti-slip and wear-resistant properties of powder coatings and achieve a leather-like textured effect, this application provides a wear-resistant powder coating, its preparation method, and its application.

[0006] In a first aspect, this application provides a wear-resistant powder coating, which adopts the following technical solution:

[0007] A wear-resistant powder coating comprises the following components in parts by weight: 60-80 parts epoxy resin, 8-12 parts curing agent, 0.3-0.5 parts cellulose acetate butyrate, and 0.2-2.0 parts polytetrafluoroethylene modified polyethylene wax;

[0008] The epoxy resin is a mixture of bisphenol A epoxy resin and o-cresol epoxy resin in a weight ratio of 1:(0.5-1.5).

[0009] This application utilizes epoxy resin, curing agent, and cellulose acetate butyrate to prepare a wear-resistant powder coating. This wear-resistant powder coating not only achieves a large-scale textured effect similar to leather but also significantly improves the anti-slip and wear-resistant properties of the coating. Specifically, a specific type and ratio of epoxy resin imparts excellent anti-slip properties, wear resistance, and mechanical strength to the coating; the curing agent provides good strength and adhesion to the coating; the addition of cellulose acetate butyrate helps to form a fine and rich texture, thereby simulating the large-scale textured appearance of leather. In addition, cellulose acetate butyrate can improve the flexibility and impact resistance of the coating, allowing it to maintain excellent physical properties under complex working conditions; the addition of polytetrafluoroethylene modified polyethylene wax further enhances the wear resistance of the coating, making it less prone to wear under long-term friction and maintaining good grip even in wet and slippery environments. In summary, the wear-resistant powder coating provided in this application is superior to existing products in terms of anti-slip properties, wear resistance, hardness, and aesthetics. It can maintain the integrity and aesthetics of the coating under high pressure and complex working conditions. In particular, it can exhibit superior performance on the anti-slip interfaces of automobiles and special equipment. It is suitable for high-performance composite materials and meets the needs of high-end applications.

[0010] Optionally, the weight ratio of the bisphenol A epoxy resin to the o-cresol epoxy resin is 1:(0.8-1.3).

[0011] In some embodiments, the weight ratio of the bisphenol A epoxy resin to the o-cresol epoxy resin can be 1:(0.5-0.8), 1:(0.5-1), 1:(0.5-1.3), 1:(0.5-1.5), 1:(0.8-1), 1:(0.8-1.3), 1:(0.8-1.5), 1:(1-1.3), 1:(1-1.5), or 1:(1.3-1.5).

[0012] In one specific implementation, the weight ratio of the bisphenol A epoxy resin to the o-cresol epoxy resin can also be 1:0.5, 1:0.8, 1:1, 1:1.3 or 1:1.5.

[0013] Optionally, the polytetrafluoroethylene modified polyethylene wax is 0.45-0.65 parts by weight.

[0014] In some embodiments, the polytetrafluoroethylene modified polyethylene wax may be present in parts by weight of 0.2-0.5, 0.2-0.8, 0.2-1.5, 0.2-2.0, 0.5-0.8, 0.5-1.5, 0.2-2.0, 0.8-1.5, 0.8-2.0, or 1.5-2.0.

[0015] In one specific implementation, the polytetrafluoroethylene modified polyethylene wax may be present in parts by weight of 0.2 parts, 0.5 parts, 0.8 parts, 1.5 parts, or 2.0 parts.

[0016] Optionally, the curing agent is selected from one or more of modified ammonia curing agents and dicyandiamide curing agents.

[0017] Optionally, the curing agent is a modified ammonia curing agent or a dicyandiamide curing agent.

[0018] Optionally, the weight ratio of the modified ammonia curing agent to the dicyandiamide curing agent is (2.5-3.5):1.

[0019] In some embodiments, the weight ratio of the modified ammonia curing agent to the dicyandiamide curing agent can be (1-2):1, (1-2.5):1, (1-3):1, (1-3.5):1, (1-4):1, (2-2.5):1, (2-3):1, (2-3.5):1, (2-4):1, (2.5-3):1, (2.5-3.5):1, (2.5-4):1, (3-3.5):1, (3-4):1, or (3.5-4):1.

[0020] In one specific implementation, the weight ratio of the modified ammonia curing agent to the dicyandiamide curing agent can also be 1:1, 2:1, 2.5:1, 3:1, 3.5:1 or 4:1.

[0021] Optionally, the wear-resistant powder coating further includes 20-25 parts of barium sulfate and 0.7-1 parts of carbon black.

[0022] Optionally, the particle size of the wear-resistant powder coating is 45±2μm.

[0023] Secondly, this application provides a method for preparing a wear-resistant powder coating, comprising the following steps: mixing the components evenly, followed by melt extrusion, tableting, coarse crushing, grinding and sieving to obtain a wear-resistant powder coating.

[0024] Thirdly, this application provides a method for spraying a wear-resistant powder coating, comprising the following steps: applying the wear-resistant powder coating at a rate of 0.08-0.12 kg / m³. 2 The coating is sprayed onto the substrate surface in a certain amount, and the coating is broken down by an electric field during the spraying process. Then it is cured at 200-220℃ for 15-20 minutes. The spraying adopts an electrostatic spraying process with a spraying temperature of 90-100℃.

[0025] In summary, this application has the following beneficial effects:

[0026] 1. This application utilizes epoxy resin, curing agent, and cellulose acetate butyrate to prepare a wear-resistant powder coating with excellent anti-slip and wear-resistant properties. This wear-resistant powder coating also has a leather-like texture effect. Applying the above-mentioned wear-resistant powder coating to the surface of high-performance composite materials has excellent decorative and functional properties, and can significantly improve the overall quality of the product.

[0027] 2. In this application, the weight ratio of bisphenol A epoxy resin and o-cresyl epoxy resin is controlled within the range of 1:(0.8-1.3), the amount of polytetrafluoroethylene modified polyethylene wax is controlled within the range of 0.2-0.8 parts, and modified ammonia curing agent and dicyandiamide curing agent with a weight ratio of (2.5-3.5):1 are used as curing agents. The resulting wear-resistant powder coating has better anti-slip and wear resistance. The anti-slip value PTV of the formed coating film is ≥60, the impact torque is ≥55kg·cm, and the wear amount is ≤15.0mg. Detailed Implementation

[0028] This application provides a wear-resistant powder coating comprising the following components in parts by weight: 60-80 parts epoxy resin, 8-12 parts curing agent, 0.3-0.5 parts cellulose acetate butyrate, 0.2-2.0 parts polytetrafluoroethylene modified polyethylene wax, 20-25 parts barium sulfate, and 0.7-1 parts carbon black. The epoxy resin is a bisphenol A epoxy resin and an o-cresin epoxy resin in a weight ratio of 1:(0.5-1.5), and the curing agent is selected from one or more of modified ammonia curing agents and dicyandiamide curing agents. Further, the weight ratio of the bisphenol A epoxy resin and the o-cresin epoxy resin is 1:(0.8-1.3), and the polytetrafluoroethylene modified polyethylene wax is 0.2-0.8 parts by weight; the curing agent is a modified ammonia curing agent and a dicyandiamide curing agent. Even further, the weight ratio of the modified ammonia curing agent and the dicyandiamide curing agent is (2.5-3.5):1.

[0029] The above-mentioned method for preparing wear-resistant powder coating includes the following steps: mixing each component evenly to obtain wear-resistant powder coating.

[0030] This application also provides a method for spraying a wear-resistant powder coating, comprising the following steps: applying the wear-resistant powder coating using an electrostatic spraying process at a concentration of 0.08-0.12 kg / m². 2 The coating is sprayed onto the substrate surface at a spraying temperature of 90-100℃. During the spraying process, an electric field is used to break down the coating, and then it is cured at 200-220℃ for 15-20 minutes.

[0031] The sources and grades of raw materials used in the embodiments of this application are shown in Table 1 below. Other raw materials, reagents, solvents, etc. used in this application can also be obtained commercially.

[0032] Table 1. Sources and grades of raw materials used in the examples.

[0033]

[0034]

[0035] The present application will be further described in detail below with reference to embodiments and performance testing.

[0036] Examples 1-5

[0037] Examples 1-5 each provide a wear-resistant powder coating.

[0038] The difference in the above embodiments lies in the type and ratio of epoxy resin, as shown in Table 2 below.

[0039] The preparation method of the wear-resistant powder coating provided in Examples 1-5 includes the following steps: weigh 66g of epoxy resin, 8.8g of curing agent (modified amine curing agent and dicyandiamide curing agent in a weight ratio of 3:1), 0.3g of cellulose acetate butyrate, 0.5g of polytetrafluoroethylene modified polyethylene wax, 23.6g of barium sulfate, and 0.8g of carbon black, and mix the above components evenly; then pour the mixture into an extruder, melt-extrude it at 120°C, and then press it into tablets, crush it in a coarse crusher, grind it in a fine grinding mill, and sieve it to obtain a wear-resistant powder coating with a particle size of 45±2μm.

[0040] Table 2. Components and proportions of epoxy resin in Examples 1-5

[0041] Example The weight ratio of bisphenol A epoxy resin to o-cresol epoxy resin 1 1：0.5 2 1：0.8 3 1：1 4 1：1.3 5 1：1.5

[0042] Examples 6-9

[0043] Examples 6-9 each provide a wear-resistant powder coating.

[0044] The difference between the above embodiments and Embodiment 3 is that the amount of polytetrafluoroethylene modified polyethylene wax added is shown in Table 3 below.

[0045] Table 3 shows the amount of polytetrafluoroethylene modified polyethylene wax added in Examples 3 and 6-9.

[0046] Example Amount of polytetrafluoroethylene modified polyethylene wax added (g) 3 0.5 6 0.2 7 0.8 8 1.5 9 2.0

[0047] Examples 10-14

[0048] Examples 10-14 each provide a wear-resistant powder coating.

[0049] The difference between the above embodiments and Embodiment 3 lies in the type and ratio of the curing agent, as shown in Table 4 below.

[0050] Table 4. Types and proportions of curing agents in Examples 3 and 10-14

[0051]

[0052] Comparative Example 1

[0053] Comparative Example 1 provides a wear-resistant powder coating.

[0054] The difference between the above comparative example and Example 3 is that only bisphenol A epoxy resin is used in the epoxy resin example.

[0055] Comparative Example 2

[0056] Comparative Example 2 provides a wear-resistant powder coating.

[0057] The difference between the above comparative example and Example 3 is that only o-cresol epoxy resin is used in the epoxy resin example.

[0058] Comparative Example 3

[0059] Comparative Example 3 provides a wear-resistant powder coating.

[0060] The difference between the above comparative example and Example 3 is that the amount of polytetrafluoroethylene modified polyethylene wax added is 0.

[0061] Application Example 1-14

[0062] Application Examples 1-14 provide a spraying method for wear-resistant powder coatings.

[0063] The difference between the above application examples is that the wear-resistant powder coatings used in the spraying methods of the wear-resistant powder coatings are derived from Examples 1-14.

[0064] The method for spraying abrasion-resistant powder coatings provided in Example 1-14 includes the following steps:

[0065] (1) Pretreatment of composite substrate: The hood of an off-road vehicle is used as the composite substrate. The surface of the hood is cleaned and degreased (wiped with isopropyl alcohol). Then, water-based conductive paint is sprayed on the back of the composite substrate (using Example 1 in CN117683439A), and then leveled. The substrate is baked at 80°C for 60 min and preheated at 130°C for 10 min to obtain the pretreated composite substrate.

[0066] (2) Electrostatic spraying: The wear-resistant powder coating is uniformly sprayed onto the surface of the pretreated composite substrate using a spraying equipment. The spray gun voltage is set to 80kV, the current to 30μA, the spraying temperature to 90-100℃, and the spraying amount to 0.1kg / m³. 2Multiple coats of paint are applied continuously in one go, and an electric field is used to break down the paint during the application process. The paint is then cured at 200°C for 15 minutes to form a dense and uniform coating on the surface of the composite substrate.

[0067] Comparative Application Examples 1-3

[0068] Comparative application examples 1-3 provide a spraying method for wear-resistant powder coatings.

[0069] The difference between the above comparative application example and application example 3 is that the wear-resistant powder coatings used in the spraying method of the wear-resistant powder coating are respectively derived from comparative examples 1-3.

[0070] Performance testing

[0071] For example 1-14, the surface coating of the composite substrate after electrostatic spraying in comparison application example 1-3 was subjected to various performance tests, including hardness, anti-slip properties, impact resistance, abrasion resistance, and adhesion. The results are shown in Table 5 below.

[0072] (1) Hardness: The hardness of the pencil was tested according to the standard GB / T6739-2006.

[0073] (2) Anti-slip properties: The anti-slip value PTV was tested according to standard BS7976-2-2002+A1-2013.

[0074] (2) Impact resistance: The impact torque is tested according to the standard GB / T1732-1993.

[0075] (3) Abrasion resistance: S-33 type sandpaper was used as the friction material. New sandpaper was changed every 100 tests. The test load was 1kg. The wear of the coating was measured after 1000 revolutions.

[0076] (4) Adhesion: Adhesion grade shall be tested in accordance with standard GB / T9286-1998.

[0077] Table 5. Surface performance test results of the coating film formed after powder coating spraying.

[0078]

[0079]

[0080] According to the test results in Table 5, the wear-resistant powder coatings provided in Examples 1-14 of this application form a smooth film on the surface of the composite material, exhibiting a large, leather-like texture. The film has a hardness of 6H, a slip resistance value (PTV) of 53-64, an impact torque of 50-63 kg·cm, an abrasion rate of 2.0-16.4 mg, and an adhesion grade of 0. Therefore, this application demonstrates that the wear-resistant powder prepared using epoxy resin, cellulose acetate butyrate, and polytetrafluoroethylene modified polyethylene wax, and employing a mixture of bisphenol A epoxy resin and o-cresaldehyde epoxy resin as the epoxy resin, results in a powder coating that, after spraying onto the surface of the composite material, forms a film with good slip resistance, excellent wear resistance, and a large, leather-like texture, meeting the requirements of high-end applications.

[0081] The anti-slip value (PTV) of the wear-resistant powder coatings provided in Comparative Examples 1-2 on the surface of the composite material was only 37-40, the impact torque was only 32-34 kg·cm, and the wear amount was as high as 20.2-22.5 mg. This indicates that the wear-resistant powder coatings prepared by using only bisphenol A epoxy resin or o-cresol epoxy resin as epoxy resin have poor anti-slip and wear resistance and cannot meet the application requirements.

[0082] The anti-slip value (PTV) of the abrasion-resistant powder coating formed on the surface of the composite material provided in Comparative Example 3 was 66, but the wear amount was as high as 35.7 mg. This indicates that although the anti-slip properties of the abrasion-resistant powder coating made without adding polytetrafluoroethylene modified polyethylene wax are good, the abrasion resistance is extremely poor and still cannot meet the application requirements.

[0083] The test results of the coatings formed in Examples 1-5 show that the anti-slip value (PTV) of the wear-resistant powder coatings in Examples 1 and 5 on the surface of the composite material is 55-57, the impact torque is 50-52 kg·cm, and the wear amount is 13.6-16.4 mg; while the anti-slip value (PTV) of the wear-resistant powder coatings in Examples 2-4 on the surface of the composite material is 60-63 (≥60), the impact torque is 55-58 kg·cm (≥55 kg·cm), and the wear amount is 5.4-13.2 mg (≤15.0 mg). Therefore, it is demonstrated that by further controlling the weight ratio of bisphenol A epoxy resin and o-cresyl epoxy resin within the range of 1:(0.8-1.3), the wear-resistant powder coating obtained in this application exhibits better anti-slip and wear resistance.

[0084] The test results of the coatings formed in Application Examples 3 and 6-9 show that as the amount of polytetrafluoroethylene modified polyethylene wax added increases, the anti-slip value of the coating formed by the wear-resistant powder coating on the surface of the composite material gradually decreases, while the impact torque remains unchanged, and the wear amount also gradually decreases. Further comparison reveals that the anti-slip value (PTV) of the coating formed by the wear-resistant powder coatings in Examples 3 and 6-7 on the surface of the composite material is 60-64 (≥60). Therefore, considering all factors, this application further controls the amount of polytetrafluoroethylene modified polyethylene wax added within the range of 0.2-0.8 parts, resulting in a better overall performance of the wear-resistant powder coating in terms of both anti-slip and wear resistance.

[0085] The test results of the coatings formed in Application Examples 3 and 10-14 show that the anti-slip value (PTV) of the wear-resistant powder coatings formed on the surface of the composite material in Examples 10-11 and 14 is 57-59, and the wear amount is 12.8-16.0 mg; while the anti-slip value (PTV) of the wear-resistant powder coatings formed on the surface of the composite material in Examples 3 and 12-13 is 61-64 (≥60), and the wear amount is 5.4-9.6 mg (≤10 mg). Therefore, it is shown that by further using a modified ammonia curing agent and a dicyandiamide curing agent with a weight ratio of (2.5-3.5):1 as curing agents, the wear-resistant powder coating obtained in this application has better overall performance in terms of anti-slip and wear resistance.

[0086] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A wear-resistant powder coating for manufacturing anti-slip interfaces in automobiles and special equipment, characterized in that, It comprises the following components in parts by weight: 60-80 parts epoxy resin, 8-12 parts curing agent, 0.3-0.5 parts cellulose acetate butyrate, and 0.2-0.8 parts polytetrafluoroethylene modified polyethylene wax; The epoxy resin is a mixture of bisphenol A epoxy resin and o-cresol epoxy resin in a weight ratio of 1:(0.8-1.3). The curing agent is a modified ammonia curing agent and a dicyandiamide curing agent; the weight ratio of the modified ammonia curing agent and the dicyandiamide curing agent is (2.5-3.5):

1.

2. The wear-resistant powder coating according to claim 1, characterized in that, The wear-resistant powder coating also includes 20-25 parts of barium sulfate and 0.7-1 parts of carbon black.

3. The wear-resistant powder coating according to any one of claims 1-2, characterized in that, The particle size of the wear-resistant powder coating is 45±2μm.

4. The method for preparing the wear-resistant powder coating as described in any one of claims 1-3, characterized in that, The process includes the following steps: mixing the components evenly, followed by melt extrusion, tableting, coarse crushing, grinding, and sieving to obtain abrasion-resistant powder coating.

5. A method for spraying a wear-resistant powder coating, characterized in that, The process includes the following steps: applying the wear-resistant powder coating according to any one of claims 1-3 or the wear-resistant powder coating obtained by the preparation method according to claim 4 at a concentration of 0.08-0.12 kg / m³. 2 The coating is sprayed onto the substrate surface in a certain amount, and the coating is broken down by an electric field during the spraying process. Then it is cured at 200-220℃ for 15-20 minutes. The spraying adopts an electrostatic spraying process with a spraying temperature of 90-100℃.

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