A polyurea anti-corrosion coating, its preparation method and application

Abstract

This application relates to the field of coating technology, specifically disclosing a polyurea anti-corrosion coating, its preparation method, and its application. This application obtains a polyurea anti-corrosion coating by scientifically formulating polyurea resin, organosilicon resin, anti-corrosion powder, and pigments. The polyurea anti-corrosion coating of this application is solvent-free polyurea, 100% solids content, environmentally friendly and non-toxic; it cures at room temperature and is easy to apply; this polyurea anti-corrosion coating exhibits high adhesion to metal components and other products or cement surfaces, excellent solvent resistance, and excellent anti-corrosion, waterproof, solvent-resistant, and high-temperature oxidation-resistant properties; the polyurea anti-corrosion coating has a long service life, is resistant to high temperatures and oxidation, and can withstand long-term outdoor exposure to temperatures above 30°C without corrosion.

Description

Technical Field

[0001] This application relates to the field of coating technology, and in particular to a polyurea anti-corrosion coating, its preparation method, and its application. Background Technology

[0002] Because metals are exposed to air, they are prone to oxidation and corrosion in natural environments. Furthermore, high-temperature and high-humidity service environments can accelerate metal aging, leading to a shortened service life. Metal components, especially those used in marine environments for extended periods, are particularly susceptible to corrosion.

[0003] Therefore, there is an urgent need to develop a coating that can effectively protect the surface of metal materials under high temperature and high humidity conditions. This coating not only needs to possess the corrosion-retarding properties common to metal coatings, but most importantly, it must be able to withstand long-term exposure to outdoor temperatures above 30°C, while also exhibiting excellent waterproof, solvent-resistant, and high-temperature oxidation-resistant properties. Summary of the Invention

[0004] The purpose of this application is to overcome the shortcomings of the prior art and provide a polyurea anti-corrosion coating, its preparation method, and its application.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] This application provides a polyurea anti-corrosion coating, which comprises the following components in parts by weight:

[0007] 10-90 parts polyurea resin, 1-20 parts organosilicon resin, 20-40 parts anti-corrosion powder, and 5-20 parts pigment;

[0008] The polyurea resin includes at least one of aspartic polyurea resin, aliphatic polyurea resin and aromatic polyurea resin;

[0009] The anti-corrosion powder includes powder A and powder B;

[0010] The A powder includes at least one of zinc powder, aluminum powder, zinc phosphate, aluminum tripolyphosphate, and titanium dioxide;

[0011] The B powder comprises silica micro powder and fumed silica;

[0012] The pigments include cobalt black.

[0013] The polyurea anti-corrosion coating of this application is obtained by scientifically formulating polyurea resin, silicone resin, anti-corrosion powder and pigment. The polyurea anti-corrosion coating has high surface adhesion when applied to products such as metal components, and has excellent anti-corrosion, waterproof, solvent resistance and high temperature oxidation resistance.

[0014] Polyurea resin is composed of semi-preform, amino-terminated polyether, and amine chain extender. Polyurea resin exhibits good flexibility, high strength, corrosion resistance, and aging resistance. Adding polyurea resin to anti-corrosion coatings results in a dense, continuous, and seamless coating that completely isolates the penetration of moisture and oxygen from the air, providing outstanding protective performance. It is non-toxic, non-polluting, and has good thermal stability, allowing for long-term use at 150℃ and outdoor use for over 10 years.

[0015] Adding silicone resin to anti-corrosion coatings results in excellent heat resistance, maintaining stable color and gloss in environments above 200℃, and preventing color loss and gloss loss even after prolonged use at 250–400℃. When applied to coating products, the anti-corrosion coating remains intact and does not crack, while retaining essential physical and mechanical properties and protective functions. Furthermore, it possesses cold resistance, moisture resistance, water repellency, and excellent weather resistance.

[0016] Among them, titanium dioxide is selected as the main white pigment for powder A, which can withstand long-term heat at 250℃; zinc powder and aluminum powder are selected for their rust prevention and resistance to atmospheric corrosion. In room temperature air, zinc powder or aluminum powder forms a thin and dense protective layer on its surface, which can prevent further oxidation and thus play a role in corrosion prevention.

[0017] Powder A is selected from zinc phosphate, which has excellent rust and corrosion resistance. Under water and air conditions, the anions in zinc phosphate react with iron cations to form a dense and strong protective layer mainly composed of iron phosphate. This dense protective layer is insoluble in water, has high hardness, strong adhesion, and can form complexes with metal ions, thus exhibiting good rust prevention.

[0018] Powder A is selected from aluminum tripolyphosphate. The phosphate ions in aluminum tripolyphosphate can react with various metal ions to form a passivation film with extremely strong chelating force, which has a strong corrosion inhibition effect on steel and light metals.

[0019] Powder B is selected from silica micropowder and fumed silica, used for thickening and filling, and is suitable for long-term heat resistance above 300℃.

[0020] Furthermore, the pigments used in this application include cobalt black, which has high heat resistance and remains unchanged in a long-term heat-resistant environment at 300°C.

[0021] In the technical solution of this application, the inventors of this application have discovered through extensive research and experimentation that the combination of powder A and pigment can better improve the solvent resistance and corrosion resistance of anti-corrosion coatings.

[0022] In a preferred embodiment of the polyurea anti-corrosion coating described in this application, the weight fraction of powder A in the anti-corrosion powder is 5 to 15 parts.

[0023] This application uses A powder in the above-mentioned weight range, which can better improve the anti-corrosion effect of polyurea anti-corrosion coating; and, by compounding A powder with pigments, the solvent resistance and anti-corrosion performance of the anti-corrosion coating can be better improved.

[0024] In a preferred embodiment of the polyurea anti-corrosion coating described in this application, the weight percentage of silica powder in powder B is 5 to 25 parts.

[0025] The silica powder, in the above-mentioned weight proportions, can be used as a thickener and filler, suitable for long-term heat resistance above 300℃, and improves the heat resistance of polyurea anti-corrosion coatings.

[0026] In a preferred embodiment of the polyurea anti-corrosion coating described in this application, the cobalt black in the pigment is 6.3 to 8.8 parts by weight.

[0027] Using cobalt black in the pigment within the aforementioned weight range can better improve the heat resistance of polyurea anti-corrosion coatings. Furthermore, combining the pigment with powder A can significantly improve the solvent resistance and corrosion resistance of the anti-corrosion coating.

[0028] As a preferred embodiment of the polyurea anti-corrosion coating described in this application, the pigment further includes at least one of cobalt blue, cobalt green, and copper chromium black.

[0029] Pigments also include cobalt blue, cobalt green, and copper chromium black. These types of pigments have high heat resistance and remain unchanged in long-term heat environments at 300°C.

[0030] By using the above-mentioned types of pigments, powder A can be compounded to improve the solvent resistance and corrosion resistance of anti-corrosion coatings.

[0031] In a preferred embodiment of the polyurea anti-corrosion coating described in this application, the particle size of powder A is 10-15 μm; the particle size of the pigment is 10-15 μm.

[0032] The anti-corrosion powder of this application adopts the above-mentioned particle size, which can improve the dispersibility of polyurea anti-corrosion coating and has excellent surface leveling performance.

[0033] The pigments used in this application, with the aforementioned particle size, can improve the dispersibility of polyurea anti-corrosion coatings, ensure uniform hue, and avoid color differences.

[0034] As a preferred embodiment of the polyurea anti-corrosion coating described in this application, the polyurea anti-corrosion coating further includes 0.2 to 1 part of dispersant, 0.2 to 0.8 parts of silicone defoamer and 0.1 to 0.5 parts of coupling agent.

[0035] As a preferred embodiment of the polyurea anti-corrosion coating described in this application, the dispersant includes at least one of sodium polyacrylate, polymethacrylic acid derivatives, and fatty alcohol polyoxyethylene ether;

[0036] The organosilicon defoamer includes polydimethylsiloxane and / or ethylene glycol siloxane;

[0037] The coupling agent includes 3-glycidyl etheroxypropyltrimethoxysilane.

[0038] This application also provides a method for preparing the above-mentioned polyurea anti-corrosion coating, including the following steps:

[0039] Polyurea resin, silicone resin, anti-corrosion powder, pigment, dispersant, silicone defoamer and coupling agent are mixed and stirred to obtain polyurea anti-corrosion coating.

[0040] Preferably, the preparation method of the polyurea anti-corrosion coating includes the following steps:

[0041] Polyurea resin and silicone resin are added to a mixing tank, followed by dispersant and coupling agent. The mixture is stirred at a low speed of 300 rpm for 30 minutes. Then, anti-corrosion powder and pigment are added, and the mixture is stirred at a high speed of 1500 rpm for 60 minutes. The speed is then reduced to 800 rpm, silicone defoamer is added, and the mixture is stirred for another 20 minutes. The product is then discharged to obtain a polyurea anti-corrosion coating.

[0042] This application also provides the application of the above-mentioned polyurea anti-corrosion coating in the preparation of protective coatings.

[0043] The polyurea anti-corrosion coating provided in this application can be used not only for the protection and corrosion prevention of metal surfaces, but also for solvent-resistant protective coatings on chemical tanks, cement floors in chemical workshops, or cement pools.

[0044] The polyurea anti-corrosion coating provided in this application can protect outdoor metal components from corrosion in various natural environments, extending the strength and service life of the metal; the coating has excellent solvent resistance, does not bubble, peel, or delaminate after long-term contact with solvents; and the surface decoration effect obtained by the coating is excellent, the construction is simple, and it is economical.

[0045] Compared with the prior art, this application has the following beneficial effects:

[0046] This application provides a polyurea anti-corrosion coating, its preparation method, and its application. The coating is prepared by scientifically formulating polyurea resin, silicone resin, anti-corrosion powder, and pigments. This polyurea anti-corrosion coating is solvent-free polyurea, 100% solids content, environmentally friendly and non-toxic; it cures at room temperature and is easy to apply. The coating exhibits high adhesion to metal components and cement surfaces, excellent solvent resistance, and superior anti-corrosion, waterproof, solvent-resistant, and high-temperature oxidation-resistant properties. It also has a long service life, high-temperature resistance, and oxidation resistance, and can withstand prolonged outdoor exposure to temperatures above 30°C without corrosion. Detailed Implementation

[0047] To better illustrate the purpose, technical solution, and advantages of this application, the following will provide further explanation of this application in conjunction with specific embodiments.

[0048] In the following examples and comparative examples, unless otherwise specified, the experimental methods used are conventional methods, and the materials and reagents used are commercially available unless otherwise specified. Furthermore, the raw materials used in each parallel experiment are the same.

[0049] In the following examples and comparative examples, the dispersant is fatty alcohol polyoxyethylene ether.

[0050] The silicone defoamer is polydimethylsiloxane.

[0051] The coupling agent is 3-glycidyl etheroxypropyltrimethoxysilane.

[0052] The zinc powder used in the anti-corrosion powder is manufactured by Jinzhou Wanda Zinc Industry Co., Ltd., with a particle size of 10-15μm and a grade of A4.

[0053] The aluminum powder used is from Gongyi Yalu Materials Co., Ltd., with a particle size of 10μm and model number YT-Al-01-3;

[0054] The manufacturer of zinc phosphate is Shandong Qianbei Chemical Co., Ltd., with a particle size of 10-15μm and the model number QB02;

[0055] The manufacturer of aluminum tripolyphosphate is Dongqianbei Chemical Co., Ltd., with a particle size of 10-15μm and the model number of Industrial 001154.

[0056] The titanium dioxide is manufactured by Jiangsu Taibai Group Co., Ltd. It is rutile titanium dioxide with a particle size of 10-15μm and the model number is ZR-969.

[0057] The manufacturer of the silicon micro powder is Guangzhou Zedanlu New Material Co., Ltd., with a particle size of 2-5μm and a model number of 997.

[0058] The manufacturer of the fumed silica is Hubei Huifu Nanomaterials Co., Ltd., with a particle size of 20-30nm and a model number of HB-151.

[0059] Examples 1-7: A polyurea anti-corrosion coating and its preparation method

[0060] Examples 1-7 provide a polyurea anti-corrosion coating, the formulation of which is shown in Table 1 (parts by weight).

[0061] The method for preparing the polyurea anti-corrosion coating provided in this application includes the following steps:

[0062] Polyurea resin and silicone resin are added to a mixing tank, followed by dispersant and coupling agent. The mixture is stirred at a low speed of 300 rpm for 30 minutes. Then, anti-corrosion powder and pigment are added, and the mixture is stirred at a high speed of 1500 rpm for 60 minutes. The speed is then reduced to 800 rpm, silicone defoamer is added, and the mixture is stirred for another 20 minutes. The product is then discharged to obtain a polyurea anti-corrosion coating.

[0063] Table 1

[0064]

[0065]

[0066] Comparative Examples 1-5

[0067] Comparative Examples 1-5 provide a polyurea anti-corrosion coating, the formulation of which is shown in Table 2 (parts by weight). The preparation method of the polyurea anti-corrosion coatings provided in Comparative Examples 1-5 is similar to that in Examples 1-7.

[0068] Table 2

[0069]

[0070]

[0071] Test examples and performance testing of polyurea anti-corrosion coatings

[0072] The polyurea anti-corrosion coatings provided in the examples and comparative examples were used for metal protection. The coatings were applied to the metal and the following tests were performed. The information on the test items is shown in Table 3.

[0073] Table 3

[0074]

[0075]

[0076] The test results of the polyurea anti-corrosion coatings provided in the examples and comparative examples are shown in Table 4.

[0077] Table 4

[0078]

[0079]

[0080]

[0081] Examples 1-7 of this application describe the preparation of polyurea anti-corrosion coatings by scientifically formulating polyurea resin, silicone resin, anti-corrosion powder, and pigments. These polyurea anti-corrosion coatings exhibit high surface adhesion when applied to metal components and other products, and possess excellent anti-corrosion, waterproof, solvent resistance, and high-temperature oxidation resistance properties. Among these, the polyurea anti-corrosion coating provided in Example 1 exhibits the best anti-corrosion, waterproof, solvent resistance, and high-temperature oxidation resistance properties.

[0082] According to the results in Table 4, compared with Example 1, Comparative Example 1 does not contain powder A and Comparative Example 2 does not contain pigment. The resulting polyurea anti-corrosion coating has poor water resistance, acid and alkali resistance and oil resistance.

[0083] Comparative Example 3 contained excessive A powder, and Comparative Example 4 contained excessive pigment. The prepared polyurea anti-corrosion coatings had poor impact resistance, cracks, and peeling. Their overall performance was inferior to that of Examples 1-7.

[0084] Furthermore, Comparative Example 5 uses other types of A powder, which has poor wear resistance and anti-slip properties, as well as poor water resistance, acid and alkali resistance and oil resistance, and is inferior to the polyurea anti-corrosion coatings of Examples 1 to 7.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit the scope of protection of this application. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the substance and scope of the technical solutions of this application.

Claims

1. A polyurea anti-corrosion coating, characterized in that, The polyurea anti-corrosion coating comprises the following components in parts by weight: 10-90 parts polyurea resin, 1-20 parts organosilicon resin, 20-40 parts anti-corrosion powder, and 5-20 parts pigment; The polyurea resin includes at least one of aspartic polyurea resin, aliphatic polyurea resin and aromatic polyurea resin; The anti-corrosion powder includes powder A and powder B; The A powder includes at least one of zinc powder, aluminum powder, zinc phosphate, aluminum tripolyphosphate, and titanium dioxide; The B powder comprises silica micro powder and fumed silica; The pigments include cobalt black; The weight percentage of powder A in the anti-corrosion powder is 5-15 parts; The weight percentage of silicon micropowder in the B powder is 5 to 25 parts; The cobalt black content in the pigment is 6.3 to 8.8 parts by weight.

2. The polyurea anti-corrosion coating as described in claim 1, characterized in that, The pigment also includes at least one of cobalt blue, cobalt green, and copper chromium black.

3. The polyurea anti-corrosion coating as described in claim 1, characterized in that, The particle size of powder A is 10~15μm; the particle size of pigment is 10~15μm.

4. The polyurea anti-corrosion coating as described in claim 1, characterized in that, The polyurea anti-corrosion coating also includes 0.2 to 1 part of dispersant, 0.2 to 0.8 parts of silicone defoamer, and 0.1 to 0.5 parts of coupling agent.

5. The polyurea anti-corrosion coating as described in claim 4, characterized in that, The dispersant includes at least one of sodium polyacrylate, polymethacrylic acid derivatives, and fatty alcohol polyoxyethylene ether; The organosilicon defoamer includes polydimethylsiloxane and / or ethylene glycol siloxane; The coupling agent includes 3-glycidyl etheroxypropyltrimethoxysilane.

6. The method for preparing the polyurea anti-corrosion coating according to any one of claims 1 to 5, characterized in that, Includes the following steps: Polyurea resin, silicone resin, anti-corrosion powder, pigment, dispersant, silicone defoamer and coupling agent are mixed and stirred to obtain polyurea anti-corrosion coating.

7. The application of the polyurea anti-corrosion coating as described in any one of claims 1 to 5 in the preparation of protective coatings.

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