Marking coating as well as preparation method and application thereof

Abstract

The invention relates to the field of coatings for metal materials, in particular to a marking coating as well as a preparation method and application thereof. The marking coating is prepared from the following components in parts by weight: 20 to 40 parts of pigment, 20 to 40 parts of resin, 0.5 to 2 parts of talcum powder, 0.5 to 2 parts of calcium carbonate, 5 to 10 parts of silane coupling agent, 20 parts of dispersing agent and 20 parts of water, the pigment comprises at least one of composite titanium red and iron oxide red; the resin comprises at least one of epoxy resin, polyurethane resin and acrylic resin. Through cooperation of the pigments (composite titanium red and iron oxide red) and the resins (epoxy resin, polyurethane resin and acrylic resin), a sufficient identification effect can be provided for a metal material of the zinc-aluminum coating, the metal material can be fully combined with the zinc-aluminum coating, corrosion of environmental factors such as moisture and air to the zinc-aluminum coating is prevented, and the service life of the zinc-aluminum coating is prolonged. And the corrosion resistance of the metal material with the zinc-aluminum coating is improved.

Description

Technical Field

[0001] The present application relates to the field of coatings for metal materials, and in particular to a marking coating and a preparation method and application thereof. Background Art

[0002] When installing or assembling existing industrial equipment or automobiles, a large number of oil pipes, water pipes, and air ducts are used. If these pipes are not tightened and sealed evenly, normal production or use will be affected, which may seriously cause safety hazards. Therefore, in practical applications, some precision-made clamps are mainly used to fix the pipes. The purchased clamps directly fix the pipes, which are prone to rust and are not convenient for subsequent maintenance personnel to quickly and accurately find the corresponding pipes for maintenance. In order to prevent rust, the existing clamps have zinc-aluminum coatings on the surface of the clamps.

[0003] Therefore, it is necessary to design a marking paint that has a high bonding strength with the zinc-aluminum material, so as to mark the zinc-aluminum coated clamps, so that maintenance personnel can quickly find the faulty wiring harness or pipeline. Summary of the invention

[0004] In order to facilitate the better combination of the marking paint with the zinc-aluminum coated clamp, the present application provides a marking paint, which is fully combined with the zinc-aluminum coating through the combination of pigments such as composite titanium red and iron oxide red and resins such as epoxy resin, polyurethane resin and acrylic resin, and improves the corrosion resistance of the metal material of the zinc-aluminum coating.

[0005] In the first aspect, the present application provides a marking coating, which adopts the following technical solution: A marking paint comprises the following components in parts by weight: 20-40 parts of pigment, 20-40 parts of resin, 0.5-2 parts of talcum powder, 0.5-2 parts of calcium carbonate, 5-10 parts of silane coupling agent, 20 parts of dispersant, and 20 parts of water; The pigment includes at least one of composite titanium red and iron oxide red; The resin includes at least one of epoxy resin, polyurethane resin and acrylic resin.

[0006] By adopting the above technical solution, composite titanium red and iron oxide red are both commonly used industrial red pigments, which can play a sufficient marking role. The above pigments have good weather resistance and can resist the erosion of ultraviolet rays, moisture and other environmental factors on the coating, thereby extending the service life of the coating.

[0007] Epoxy resin, polyurethane resin and acrylic resin, these resins can firmly adhere to the surface of zinc-aluminum coating, forming a tight coating to prevent the erosion of the coating by environmental factors such as moisture and air. At the same time, these resins provide good hardness and wear resistance for the coating, making it able to resist external physical impact and wear.

[0008] The interaction between the pigment and the resin enables the coating to adhere firmly to the surface of the zinc-aluminum coating. The bonding properties of the resin and the weather resistance of the pigment work together to form a close bond between the coatings, making them less likely to fall off. The filling properties of the resin and the hiding power of the pigment work together to enable the coating to form a dense barrier that effectively prevents environmental factors such as moisture and air from corroding the zinc-aluminum coating. Both the pigment and the resin have good chemical resistance and can resist corrosion from chemicals such as acids and alkalis. At the same time, the density of the coating and the bonding properties of the resin enable the coating to effectively protect the zinc-aluminum coating from chemical corrosion and physical wear, thereby improving the corrosion resistance of the metal material.

[0009] The present application, through the combination of pigments (composite titanium red and red iron oxide) and resins (epoxy resin, polyurethane resin and acrylic resin), can not only provide sufficient marking effect for zinc-aluminum coated metal materials, but also fully combine with the zinc-aluminum coating and hinder the erosion of the zinc-aluminum coating by environmental factors such as moisture and air, thereby improving the corrosion resistance of the zinc-aluminum coated metal materials.

[0010] Preferably, the pigment is red iron oxide, and the weight portion of the red iron oxide is 20-35 parts.

[0011] By adopting the above technical solution, red iron oxide is an inorganic pigment. Due to its inorganic nature, the combination of red iron oxide and zinc-aluminum coating is usually strong, which can provide good adhesion and durability. Red iron oxide has excellent weather resistance and corrosion resistance, and can keep the color bright and stable for a long time. This makes the red iron oxide coating effectively resist the erosion of environmental factors such as ultraviolet rays, moisture, salt spray, etc. when used in outdoor environments, thereby protecting the zinc-aluminum coating from damage.

[0012] Since composite titanium red is a pigment composed of organic pigments and inorganic pigments, its corrosion resistance is lower than that of red iron oxide. Compared with the two, red iron oxide has a better effect. Therefore, even if the addition amount of red iron oxide is reduced to 20-35 parts, it can still maintain excellent performance.

[0013] Preferably, the pigment is a pigment mixture of iron oxide red and composite titanium red.

[0014] By adopting the above technical solution, red iron oxide, as an inorganic pigment, is known for its excellent corrosion resistance. It can maintain color stability and coating integrity in a variety of harsh environments. This enables it to effectively resist erosion by environmental factors such as moisture, oxygen, and salt spray. Therefore, adding red iron oxide to the coating can significantly improve the corrosion resistance of the coating, thereby protecting the substrate from damage.

[0015] Composite titanium red is a pigment with composite properties, which combines the high tinting power and bright colors of organic pigments with the excellent properties of inorganic pigments such as high temperature resistance and weather resistance. The wettability and dispersibility of composite titanium red are one of its important performance characteristics. Since composite titanium red has a smaller particle size and uniform particle size distribution, it can be more easily wetted and dispersed in the paint to form a uniform coating. This uniform coating can not only improve the hiding power and tinting power of the paint, but also enhance the bonding force between the coating and the substrate, thereby improving the overall performance of the coating.

[0016] When red iron oxide and composite titanium red are mixed, they can complement each other and jointly improve the corrosion resistance and bonding of the coating. On the one hand, the corrosion resistance of red iron oxide can protect the coating from erosion by environmental factors and extend the service life of the coating; on the other hand, the wettability and dispersibility of composite titanium red can improve the construction performance and coating quality of the coating and improve the bonding between the coating and the substrate. Therefore, the mixture of red iron oxide and composite titanium red has better comprehensive performance in the coating.

[0017] Both red iron oxide and composite titanium red have excellent corrosion resistance. Their combination can further enhance the corrosion resistance of the coating, making the coating better resistant to erosion by environmental factors such as moisture, oxygen, and salt spray. The wettability and dispersibility of composite titanium red help improve the bonding between the coating and the substrate, while the stable chemical properties of red iron oxide help maintain the integrity of the coating. The combination of the two can form a tight and firm coating, improving the bonding between the coating and the zinc-aluminum coating.

[0018] Preferably, the mass ratio of red iron oxide to composite titanium red in the pigment mixture is 10:3-6.

[0019] By adopting the above technical solution, composite titanium red plays an important role in the coating with its good wettability and dispersibility. If the mass ratio of composite titanium red is too low, the bonding degree between the coating and the zinc-aluminum coating will not be significantly improved. Composite titanium red also has certain color effects and hiding power. In the pigment mixture, it can work together with red iron oxide to form a fuller and brighter color. If the mass of composite titanium red is too low, it may weaken the color effect and hiding power of the coating and affect the final visual effect.

[0020] If the content of composite titanium red is too high, the relative content of iron oxide red will be lower, and the corrosion resistance of iron oxide red is higher than that of composite titanium red. If the content of composite titanium red is too high, the corrosion resistance of the coating will be reduced.

[0021] Preferably, the resin is an epoxy resin, and the weight portion of the epoxy resin is 25-35 parts.

[0022] By adopting the above technical solution, epoxy resin has strong cohesion and adhesion, and can form a good bond with a variety of substrates. This adhesion is mainly due to the polar functional groups in its molecular structure, such as epoxy groups and hydroxyl groups, which can form chemical bonds with the metal atoms on the surface of the zinc-aluminum coating, thereby significantly improving the bonding and adhesion of the coating. In contrast, although polyurethane resin and acrylic resin also have certain adhesion, they are not as tight as epoxy resin in bonding with zinc-aluminum coatings.

[0023] Preferably, the resin is a resin mixture of epoxy resin and acrylic resin.

[0024] By adopting the above technical solutions, epoxy resin has the characteristics of high bonding strength with zinc and aluminum coating. Acrylic resin is well known for its excellent corrosion resistance. It can resist the erosion of a variety of chemicals, including acids, alkalis, salts, etc. This corrosion resistance mainly comes from the tight molecular structure and good chemical stability of acrylic resin. When acrylic resin is used as a coating component, it can effectively protect the substrate from erosion by environmental factors and extend the service life of the substrate.

[0025] The high bonding strength of the epoxy resin ensures a tight bond between the coating and the zinc-aluminum coating. The high corrosion resistance of the acrylic resin provides additional protection for the coating, allowing the coating to maintain its integrity and performance in harsh environments. This corrosion resistance is further enhanced when combined with the epoxy resin, thereby improving the long-term protection of the coating to the substrate.

[0026] Preferably, the mass ratio of epoxy resin to acrylic resin in the resin mixture is 10:4-8.

[0027] By adopting the above technical solutions, acrylic resin is known for its good corrosion resistance and can resist the erosion of various chemicals. When the content of acrylic resin is too low, the corrosion resistance of the mixed resin may decrease, thereby affecting the protective effect of the coating on the substrate. Although epoxy resin has the characteristics of high bonding strength with zinc and aluminum coatings, it may not be as good as acrylic resin in terms of corrosion resistance. The right amount of acrylic resin can balance the bonding strength and corrosion resistance, so that the coating has excellent corrosion resistance while maintaining high bonding strength.

[0028] If the content of acrylic resin is too high, the relative content of epoxy resin will be lower, and the bonding strength of epoxy resin will be higher than that of acrylic resin. If the content of acrylic resin is too high, the bonding strength between the coating and the zinc-aluminum coating will be reduced.

[0029] In a second aspect, the present application provides a method for preparing a marking coating, using the following technical solution: A method for preparing a marking coating, used for preparing the above-mentioned marking coating, comprises the following steps: Step 1: Evenly mix the formulated amount of silane coupling agent and dispersant to obtain a mixture A; Step 2: adding the formulated amount of talcum powder and calcium carbonate to the mixed solution A, and mixing evenly to obtain a mixed material B; Step 3: Add the formulated amount of pigment, resin and water into the mixed material B, and mix them evenly to obtain the marking paint.

[0030] By adopting the above technical solution, the silane coupling agent can effectively connect the organic film-forming substance and the inorganic filler as a bridge, thereby improving the adhesion between the coating and the substrate. This enhanced adhesion makes the coating less likely to fall off after coating, and improves the durability of the coating. By accurately controlling the proportion and mixing uniformity of components such as pigments, resins, and fillers, a marking coating with excellent hiding power, gloss, wear resistance, and light resistance can be prepared.

[0031] In a third aspect, the present application provides an application of a marking coating, using the following technical solution: The invention discloses an application of a marking paint for coating and marking on a metal material including a zinc-aluminum coating.

[0032] Preferably, the application of the coating marking is performed on a zinc-aluminum coated clamp.

[0033] By adopting the above technical solutions, the zinc-aluminum coating itself has provided good corrosion resistance for metal materials. The application of marking paint further enhances this protective effect. The components in the paint can form a close bond with the zinc-aluminum coating to jointly resist corrosive media in the environment, such as moisture, oxygen and salt spray.

[0034] The marking paint has a bright color and good hiding power, and can form a clear mark on the zinc-aluminum coating. This helps to quickly identify specific metal materials or parts (such as zinc-aluminum coated clamps) in a complex working environment, improving work efficiency and safety.

[0035] In addition to color marking, marking paint can also be used to mark important information, such as material specifications, production date, manufacturer, etc. This information is important for tracking and managing metal materials. Clear marking makes it easier for inspectors to find potential problems on metal materials, such as corrosion, cracks, etc. This helps to take timely measures to repair or replace them to avoid further deterioration of the problem. Clear marking makes it easier for inspectors to find potential problems on metal materials, such as corrosion, cracks, etc. This helps to take timely measures to repair or replace them to avoid further deterioration of the problem.

[0036] In summary, this application has the following beneficial effects: Because the present application combines pigments (composite titanium red and red iron oxide) with resins (epoxy resin, polyurethane resin and acrylic resin), it can not only provide sufficient marking effect for zinc-aluminum coated metal materials, but also fully combine with the zinc-aluminum coating and hinder the erosion of the zinc-aluminum coating by environmental factors such as moisture and air, thereby improving the corrosion resistance of the zinc-aluminum coated metal materials. DETAILED DESCRIPTION

[0037] The raw materials in this application include the following parts: Composite titanium red: a commercially available product is used. This application uses a commercially available product of Shanghai Longti Chemical Co., Ltd. as an example; Iron oxide red: a commercial product with CAS number 1332-37-2 is used; Epoxy resin: a commercial product with CAS number 61788-97-4 is used; Polyurethane resin: a commercially available product with CAS number 9009-54-5; Acrylic resin: a commercially available product with CAS number 9003-01-4; Talc: a commercially available product with CAS number 14807-96-6; Calcium carbonate: a commercially available product with CAS No. 471-34-1; Silane coupling agent: commercially available products such as KH550, KH560, and KH570 may be used. This application uses the commercially available product KH550 produced by Nanjing Youpu Chemical Co., Ltd. as an example; Dispersant: commercially available products such as ethanol, propylene glycol and polyethylene glycol can be used. This application uses a commercially available ethanol product with a CAS number of 64-17-5 as an example; Water: a commercial product with CAS number 7732-18-5 was used; The present application is further described in detail below in conjunction with embodiments and comparative examples.

[0038] Example 1 A method for preparing a marking coating comprises the following steps: Step 1: Evenly mix 8 g of silane coupling agent KH550 and 20 g of ethanol to obtain a mixture A; Step 2: Add 1.5 g of talcum powder and 1.5 g of calcium carbonate to the mixed solution A, and mix well to obtain a mixed material B; Step 3: Add 35 g of red iron oxide, 35 g of epoxy resin and 20 g of water to mixture B, and mix well to obtain marking paint.

[0039] A process for applying a marking coating comprises the following steps: Dip-spin coating: Use a planetary coating machine to load the newly purchased zinc-aluminum coated clamp into a perforated basket, immerse the basket into a coating tank filled with marking paint, the coating liquid temperature is 21°C, and immerse for 10 seconds; lift the basket to make it leave the surface of the coating tank and spin it for 5 seconds in a forward direction and 5 seconds in a reverse direction, repeat the forward and reverse directions once each, and the centrifugal speed is 270r / min; pour out the clamp in the basket and set aside; Sintering: the dip-spin coated clamp is sent into a mesh belt sintering furnace and sintered at 240°C for 20 minutes; Cooling: After sintering, the clamp is cooled to 23°C by air cooling, and finally the marking paint is solidified on the surface of the clamp.

[0040] The same application can be achieved by replacing the zinc-aluminum coated clamp with other zinc-aluminum coated metal materials.

[0041] Example 2-3 Example 2-3 Based on the preparation method of Example 1, the content of each component of the marking coating is adjusted, and the specific adjustment is shown in Table 1.

[0042] Comparative Example 1 Comparative Example 1 is a zinc-aluminum coated clamp that is not coated with a marking paint.

[0043] Table 1 Content of each component of the marking coating of Examples 1-3 and performance test table of Comparative Example 1 project Example 1 Example 2 Example 3 Comparative Example 1 Iron oxide red / g 35 20 40 / Epoxy resin / g 35 20 40 / Talc / g 1.5 0.5 2 / Calcium carbonate / g 1.5 0.5 2 / KH550 / g 8 5 10 / Ethanol / g 20 20 20 / Water / g 20 20 20 / Adhesion strength / MPa 9.24 8.56 9.25 / Salt spray rust time / h 1550 1470 1550 1300 Strong corrosion rust time / min 270 250 270 220 Performance testing The following performance tests were performed on Examples 1-3 and Comparative Example 1. The test results are shown in Table 1.

[0044] 1. Adhesion strength The adhesion strength of the marking coating on a zinc-aluminum alloy test column (zinc 55wt%, aluminum 43.4wt%, silicon 1.6wt%) was tested according to GB / T 5210-2006.

[0045] 2. Neutral salt spray test According to GB / T 10125-2021, the time for rust spots to appear on the zinc-aluminum coated clamp after coating the marking paint under neutral salt spray conditions is tested. The thickness of the zinc-aluminum coating is 100μm, and the content of each element in the zinc-aluminum coating is 55wt% zinc, 43.4wt% aluminum, and 1.6wt% silicon.

[0046] 3. Strong corrosion test After the zinc-aluminum coating is coated with the marking paint, the clamp is immersed in a 20% ammonium nitrate solution at a temperature of 80°C, and the time when the rust spots appear is recorded. The thickness of the zinc-aluminum coating is 100 μm, and the content of each element in the zinc-aluminum coating is 55wt% zinc, 43.4wt% aluminum, and 1.6wt% silicon.

[0047] Referring to Table 1, it can be seen from the comparison between Examples 1-3 and Comparative Example 1 that the adhesion strength is between 8.56-9.25 MPa, indicating that the marking coating can be well combined with the zinc-aluminum coating. Compared with Comparative Example 1, the salt spray rust time and strong corrosion rust time of Examples 1-3 are much higher than those of Comparative Example 1, indicating that the marking coating has good sealing properties and can prevent water and air from contacting the zinc-aluminum coating, thereby increasing the salt spray rust time. The red iron oxide and epoxy resin in the marking coating have good corrosion resistance, which can further increase the strong corrosion rust time and improve the corrosion resistance of the clamp.

[0048] Among them, the performance of Example 3 is equivalent to that of Example 1, but the raw material content of Example 3 is higher than that of Example 1. Comprehensively compared, Example 1 is preferred.

[0049] Embodiment 4-6 In Example 4-6, based on the preparation method of Example 1, the amount of red iron oxide added was adjusted, and the specific adjustment is shown in Table 2.

[0050] The marking coatings of Examples 4-6 were subjected to the above performance tests, and the test results are shown in Table 2.

[0051] Table 2 The amount of red iron oxide added and the performance test table of Example 1 and Examples 4-6 project Example 1 Example 4 Example 5 Example 6 Iron oxide red / g 35 20 30 40 Adhesion strength / MPa 9.24 9.06 9.16 9.19 Salt spray rust time / h 1550 1530 1540 1545 Strong corrosion rust time / min 270 255 260 270 Referring to Table 2, by comparing Example 1 with Examples 4-6, it can be seen that when the amount of red iron oxide added continues to increase, the adhesion strength and the salt spray rust time show a trend of first increasing and then decreasing, and the strong corrosion rust time shows a trend of increasing and then tending to be stable. This may be because when the amount of red iron oxide added continues to increase, red iron oxide, as an inorganic pigment, is usually more firmly combined with the zinc-aluminum coating, and can provide good adhesion and durability, thereby improving the adhesion strength; red iron oxide has excellent weather resistance and corrosion resistance. As its content increases, the salt spray rust time and the strong corrosion rust time continue to increase, indicating that the corrosion resistance is continuously improved.

[0052] When it exceeds a certain range, the red iron oxide content is higher than the epoxy resin content, the mixing between red iron oxide and epoxy resin, and the sealing of the marking paint to the zinc-aluminum coating are affected, thereby reducing the adhesion strength and salt spray rust time.

[0053] Embodiment 7-9 Example 7 Based on the preparation method of Example 1, 35g of red iron oxide is replaced with 35g of composite titanium red, and the other conditions remain unchanged.

[0054] Example 8 Based on the preparation method of Example 1, 35g of red iron oxide is replaced with 40g of composite titanium red, and the other conditions remain unchanged.

[0055] Example 9 Based on the preparation method of Example 1, 35g of red iron oxide is replaced with 35g of a pigment mixture of red iron oxide and composite titanium red, the mass ratio of red iron oxide to composite titanium red in the pigment mixture is 10:5, and other conditions remain unchanged.

[0056] The marking coatings of Examples 7-9 were subjected to the above performance tests, and the test results are shown in Table 3.

[0057] Table 3 Pigment types and performance test table of Example 1 and Examples 7-9 project Example 1 Example 7 Example 8 Example 9 Pigment Type Iron oxide red Composite titanium red Composite titanium red Pigment mixture Adhesion strength / MPa 9.24 9.56 9.57 9.47 Salt spray rust time / h 1550 1530 1530 1560 Strong corrosion rust time / min 270 260 260 285 Referring to Table 3, it can be seen from the comparison between Example 1 and Examples 7-9 that, among the two individual pigments, the composite titanium red has better binding properties with the zinc-aluminum coating, and the iron oxide red has stronger corrosion resistance. This may be because the composite titanium red is a pigment with a composite nature, which combines the high tinting power and colorful colors of organic pigments with the excellent properties of inorganic pigments such as high temperature resistance, weather resistance and light resistance. In addition, the composite titanium red has a smaller particle size and a uniform particle size distribution, which can be more easily wetted and dispersed in the coating to form a uniform coating. This uniform coating can not only improve the hiding power and tinting power of the coating, but also enhance the bonding force between the coating and the substrate, thereby improving the overall performance of the coating.

[0058] Therefore, when iron oxide red and composite titanium red are mixed, the three properties are improved compared with iron oxide red. Compared with composite titanium red, the salt spray rust time and strong corrosion rust time are improved.

[0059] Examples 10-13 In Examples 10-13, based on the preparation method of Example 9, the mass ratio of red iron oxide and composite titanium red was adjusted, and the specific adjustment is shown in Table 4.

[0060] The marking coatings of Examples 10-13 were subjected to the above performance tests, and the test results are shown in Table 4 respectively.

[0061] Table 4 Mass ratio and performance test table of iron oxide red and composite titanium red in Example 1 and Example 9-13 project Example 1 Example 9 Example 10 Embodiment 11 Example 12 Example 13 Pigment mass ratio / 10:5 10:2 10:3 10:6 10:8 Adhesion strength / MPa 9.24 9.47 9.30 9.35 9.49 9.50 Salt spray rust time / h 1550 1560 1545 1550 1560 1550 Strong corrosion rust time / min 270 285 265 270 280 265 Referring to Table 4, it can be seen from the comparison between Example 1 and Examples 9-13 that as the mass ratio of iron oxide red to composite titanium red gradually increases, the adhesion strength shows a trend of continuous increase, and the salt spray rust point time and the strong corrosion rust point time both show a trend of first increasing and then decreasing. This may be because as the mass ratio of iron oxide red to composite titanium red gradually increases, the content of composite titanium red gradually increases, thereby improving the bonding ability with the zinc-aluminum coating; at the same time, the two cooperate to improve the corrosion resistance.

[0062] When the mass ratio of red iron oxide and composite titanium red exceeds a certain range, the content of composite titanium red is too much and the relative content of red iron oxide is reduced. Since the corrosion resistance of red iron oxide is higher than that of composite titanium red, the corrosion resistance will be reduced.

[0063] Examples 14-16 In Examples 14-16, based on the preparation method of Example 1, the amount of epoxy resin added was adjusted, and the specific adjustments are shown in Table 5.

[0064] The marking coatings of Examples 14-16 were subjected to the above performance tests, and the test results are shown in Table 5.

[0065] Table 5 Addition amount of epoxy resin and performance test table of Example 1 and Examples 14-16 project Example 1 Embodiment 14 Embodiment 15 Example 16 Epoxy resin / g 35 20 30 40 Adhesion strength / MPa 9.24 9.01 9.18 9.24 Salt spray rust time / h 1550 1520 1545 1550 Strong corrosion rust time / min 270 255 265 270 Referring to Table 5, it can be seen from the comparison between Example 1 and Examples 14-16 that when the amount of epoxy resin added increases continuously, the adhesion strength, salt spray rust time and strong corrosion rust time all show a trend of increasing and then stabilizing. This may be because when the amount of epoxy resin added increases continuously, the epoxy resin has strong cohesion and adhesion, and can form a good bond with a variety of substrates. The functional groups of the epoxy resin can form chemical bonds with the metal atoms on the surface of the zinc-aluminum coating, thereby significantly improving the bonding and adhesion of the coating. With the improvement of bonding and sealing, the corrosion resistance is improved.

[0066] Examples 17-19 Example 17 is based on the preparation method of Example 1, except that 35g of epoxy resin is replaced with 35g of polyurethane resin, and the other conditions remain unchanged.

[0067] Example 18 is based on the preparation method of Example 1, except that 35 g of epoxy resin is replaced with 35 g of acrylic resin, and the other conditions remain unchanged.

[0068] Example 19 Based on the preparation method of Example 1, 35g of epoxy resin is replaced with 35g of a resin mixture of epoxy resin and acrylic resin, the mass ratio of epoxy resin to acrylic resin in the resin mixture is 10:7, and other conditions remain unchanged.

[0069] The marking coatings of Examples 17-19 were subjected to the above performance tests, and the test results are shown in Table 6.

[0070] Table 6 Resin types and performance test table of Example 1 and Examples 17-19 project Example 1 Embodiment 17 Embodiment 18 Embodiment 19 Resin Type Epoxy resin Polyurethane resin Acrylic resin Resin mixture Adhesion strength / MPa 9.24 9.18 9.05 9.14 Salt spray rust time / h 1550 1545 1540 1570 Strong corrosion rust time / min 270 255 275 285 Referring to Table 6, it can be seen from the comparison between Example 1 and Examples 17-19 that among the three individual resins, the epoxy resin has better binding properties with the zinc-aluminum coating, and the acrylic resin has stronger corrosion resistance. Therefore, when the epoxy resin and the acrylic resin are mixed with each other, the salt spray rust point time and the strong corrosion rust point time are improved compared to the epoxy resin. Compared to the acrylic resin, all three properties are improved.

[0071] Examples 20-23 In Examples 20-23, based on the preparation method of Example 19, the mass ratio of the epoxy resin to the acrylic resin was adjusted, and the specific adjustment is shown in Table 7.

[0072] The marking coatings of Examples 20-23 were subjected to the above performance tests, and the test results are shown in Table 7 respectively.

[0073] Table 7 Mass ratio and performance test table of epoxy resin and acrylic resin in Example 1 and Examples 19-23 Referring to Table 7, it can be seen from the comparison between Example 1 and Examples 19-23 that as the mass ratio of epoxy resin to acrylic resin gradually increases, the adhesion strength shows a downward trend, the salt spray rust time shows a trend of first rising and then falling, and the strong corrosion rust time shows a trend of gradually rising and then stabilizing. It may be that as the mass ratio of epoxy resin to acrylic resin gradually increases, the content of acrylic resin gradually increases, which reduces the bonding ability with the zinc-aluminum coating. However, the corrosion resistance of acrylic resin is higher than that of epoxy resin, and the salt spray rust time and strong corrosion rust time gradually increase.

[0074] When the mass ratio of epoxy resin to acrylic resin exceeds a certain range, the content of acrylic resin is too much and the relative content of epoxy resin is reduced. Since the sealing property of epoxy resin is higher than that of acrylic resin, the salt spray rust time will be reduced.

[0075] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A marking paint, characterized in that: The invention comprises the following components in parts by weight: 20-40 parts of pigment, 20-40 parts of resin, 0.5-2 parts of talc, 0.5-2 parts of calcium carbonate, 5-10 parts of silane coupling agent, 20 parts of dispersant and 20 parts of water; The pigment includes at least one of composite titanium red and iron oxide red; The resin includes at least one of epoxy resin, polyurethane resin and acrylic resin.

2. The marking paint according to claim 1, characterized in that: The pigment is red iron oxide, and the weight portion of the red iron oxide is 20-35 parts.

3. The marking paint according to claim 1, characterized in that: The pigment is a pigment mixture of iron oxide red and composite titanium red.

4. The marking paint according to claim 3, characterized in that: The mass ratio of iron oxide red to composite titanium red in the pigment mixture is 10:3-6.

5. The marking paint according to claim 1, characterized in that: The resin is epoxy resin, and the weight portion of the epoxy resin is 25-35 parts.

6. The marking paint according to claim 1, characterized in that: The resin is a resin mixture of epoxy resin and acrylic resin.

7. The marking paint according to claim 6, characterized in that: The mass ratio of the epoxy resin to the acrylic resin in the resin mixture is 10:4-8.

8. The method for preparing the marking coating according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Evenly mix the formulated amount of silane coupling agent and dispersant to obtain a mixture A; Step 2: adding the formulated amount of talcum powder and calcium carbonate to the mixed solution A, and mixing them evenly to obtain a mixed material B; Step 3: Add the formulated amount of pigment, resin and water into the mixed material B, and mix them evenly to obtain the marking paint.

9. Use of the marking coating according to any one of claims 1 to 7, characterized in that: Application of coating marking on metallic materials including zinc-aluminum coatings.

10. The use of the marking paint according to claim 9, characterized in that: Application of coating markings on zinc-aluminium coated clamps.

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