Preparation method of polyurea wear-resistant corrugated plate

Abstract

The invention relates to the technical field of wear-resistant coatings, in particular to a preparation method of a polyurea wear-resistant corrugated plate, which comprises the following steps: 1, adding a polyamine mixture into an aqueous solution of an organic solvent, slowly adding a polyurea polymer while stirring, uniformly stirring, and storing at low temperature to prepare polyurea composite slurry; 2, keeping low temperature, adding diisocyanate accounting for 5-10% of the polyurea composite slurry, an organic tin catalyst, metal alloy powder and an auxiliary agent into the slurry in the step 1, uniformly mixing, and uniformly coating the surface of the corrugated plate base material with the mixture; and 3, drying the corrugated plate coated in the step 2 at 50-80 DEG C to obtain the corrugated plate. According to the method disclosed by the invention, the polyamine mixture and the polyurea are mixed, then the diisocyanate is added, the reaction is performed under the catalytic action of the catalyst to produce the polyurethane, and the polyurethane and the polyurea polymer form a network type composite material, so that the corrosion resistance is higher; the metal alloy powder added in the system is uniformly dispersed in a polymer grid, so that the wear resistance and impact resistance of the coating can be improved.

Description

Technical Field

[0001] This invention relates to the field of wear-resistant coatings, and in particular to a method for preparing a polyurea wear-resistant corrugated board. Background Technology

[0002] Polyurea, as a high-performance polymer, possesses excellent wear resistance, corrosion resistance, impact resistance, and elastic recovery. These properties are fully utilized in the preparation of polyurea-coated corrugated sheets. Through specific preparation processes, such as the preparation of polyurea composite slurry, coating, and setting mentioned above, polyurea can form a robust and durable coating on the corrugated sheet substrate. This not only enhances the wear resistance of the corrugated sheet but also improves its overall service life and reliability. Therefore, polyurea plays an irreplaceable role as a key material in the preparation of wear-resistant corrugated sheets. However, corrugated sheets are used in harsh environments, and even pure polyurea coatings can experience wear or peeling. Summary of the Invention

[0003] To address the problem of wear or detachment of existing pure polyurea corrugated sheets under harsh environments, this invention provides a method for preparing a polyurea wear-resistant corrugated sheet, comprising the following steps: I. Preparation of Polyurea Composite Slurry A polyamine mixture was added to an aqueous solution of an organic solvent, and a polyurea polymer was slowly added while stirring. After stirring until homogeneous, the mixture was stored at low temperature to obtain a polyurea composite slurry. II. Painting Keep the temperature low, add 5%~10% diisocyanate, organotin catalyst, metal alloy powder and additives of polyurea composite slurry to the slurry in step one, mix evenly and then coat it evenly on the surface of the corrugated plate substrate. III. Finalization The corrugated plate coated in step two is dried at 50~80℃ to obtain the final product.

[0004] Furthermore, in step one, the polyamine mixture is a mixture of ethylenediamine and a triamine compound; the organic solvent is one or more of DMSO, DMAc, and DMF; and the weight of the polyurea accounts for 70% to 95% of the total weight of the polyurea composite slurry.

[0005] Furthermore, in step two, the diisocyanate is one of MDI, HDI, TDI, or IPDI; the amount of metal alloy powder is 2% to 10% of the weight of the polyurea composite slurry, and its composition includes the following components by weight percentage: 60% to 88% iron, 4% to 18% chromium, 6% to 15% phosphorus, 1% to 4% carbon, 0.5% to 1.5% silicon, and 0.5% to 1.5% boron; the additive is one or more of dispersant, defoamer, leveling agent, and pH adjuster, and the amount is 3% to 7% of the weight of the polyurea composite slurry.

[0006] Compared with existing technologies, this invention has the following advantages: The method of this invention mixes a polyamine mixture and polyurea, then adds diisocyanate. Under the catalysis of a catalyst, the mixture reacts to produce polyurethane, forming a network composite material with the polyurea polymer, exhibiting higher corrosion resistance. The metal alloy powder added to the system is uniformly dispersed in the polymer network, which can increase the wear resistance and impact resistance of the coating. The polyurea wear-resistant corrugated sheet prepared using the method of this invention can be used for a long time in harsh environments without performance degradation.

[0007] Furthermore, by optimizing the drying temperature and time, this invention ensures the coating can fully cure, further improving the overall performance of the polyurea wear-resistant corrugated sheet. Simultaneously, the additives used in this invention, such as dispersants, defoamers, leveling agents, and pH adjusters, help improve the dispersibility of the coating, reduce bubble formation, improve coating smoothness, and adjust the pH value of the coating, thereby ensuring the quality and stability of the coating. In summary, this invention provides a highly efficient, environmentally friendly, and durable method for preparing polyurea wear-resistant corrugated sheets, with broad application prospects. Detailed Implementation

[0008] The present invention will be described below with reference to examples. These examples are only used to explain the present invention and are not intended to limit the scope of the present invention. Example 1

[0009] A method for preparing a polyurea wear-resistant corrugated sheet includes the following steps: 1. Add a mixture of ethylenediamine and triamine compound in a weight ratio of 1:1 to an aqueous solution of DMSO, slowly add polyurea polymer while stirring, stir evenly and store at low temperature to obtain a polyurea composite slurry with a polyurea content of 85%. 2. Keep the temperature low and add 8 parts by weight of MDI, 0.1 parts by weight of organotin catalyst, 6 parts by weight of metal alloy powder, 3 parts by weight of acrylic leveling agent and 2 parts by weight of sodium dodecyl sulfate to 100 parts by weight of polyurea composite slurry obtained in step one. After mixing evenly, coat the mixture evenly on the surface of the corrugated board substrate. 3. Dry the corrugated board coated in step two at 70°C for 5 hours to obtain the final product. Example 2

[0010] A method for preparing a polyurea wear-resistant corrugated sheet includes the following steps: 1. Add the triamine compound to the aqueous solution of DMAc, slowly add the polyurea polymer while stirring, stir evenly and store at low temperature to obtain a polyurea composite slurry with a polyurea content of 90%. 2. Keep the temperature low and add 5 parts by weight of TDI, 0.2 parts by weight of organotin catalyst, 2 parts by weight of metal alloy powder, 3 parts by weight of acrylic leveling agent and 1 part by weight of polyacrylamide to 100 parts by weight of polyurea composite slurry obtained in step one. Mix evenly and then coat evenly on the surface of the corrugated board substrate. 3. Dry the corrugated board coated in step two at 60°C for 10 hours to obtain the final product. Example 3

[0011] A method for preparing a polyurea wear-resistant corrugated sheet includes the following steps: 1. Add a mixture of ethylenediamine and triamine compound in a weight ratio of 1:2 to an aqueous solution of DMF, slowly add polyurea polymer while stirring, stir evenly and store at low temperature to obtain a polyurea composite slurry with a polyurea content of 70%. 2. Keep the temperature low and add 10 parts by weight of IPDI, 0.5 parts by weight of organotin catalyst, 10 parts by weight of metal alloy powder, 3 parts by weight of organosilicon leveling agent, 3 parts by weight of sodium dodecyl sulfate and 2 parts by weight of AMP95 to 100 parts by weight of polyurea composite slurry obtained in step one. Mix evenly and then coat evenly on the surface of the corrugated plate substrate. 3. Dry the corrugated plate coated in step two at 50°C for 24 hours to obtain the final product.

[0012] The preparation methods of the polyurea corrugated sheets in Examples 1-3 are the same as those in Examples 1-3, which are prepared using only polyurea and additives. Table 1 shows the performance test results of the corrugated sheets in Examples 1-3 and Comparative Examples 1-3, with a uniform coating thickness of 300 μm. The data in the table show that the polyurea corrugated sheets prepared by the method of this invention exhibit excellent overall performance.

[0013] Table 1. Performance testing of corrugated plates in Examples 1-3 and Comparative Examples 1-3

[0014] Although the polyurea corrugated sheets of Comparative Examples 1 to 3 also used polyurea and additives in their preparation process, they did not include components such as metal alloy powder to enhance wear resistance. Therefore, their performance was significantly different from that of the polyurea wear-resistant corrugated sheets of Examples 1 to 3. Table 1 details the specific data of the corrugated sheets of the examples and comparative examples in various performance tests, including key indicators such as wear resistance, corrosion resistance, hardness, and adhesion. Through comparative analysis, it can be clearly seen that the polyurea wear-resistant corrugated sheets prepared by the method of this invention, while maintaining a consistent coating thickness, have significantly better performance in all aspects than the comparative products, demonstrating superior comprehensive performance. This not only verifies the scientific nature and effectiveness of the preparation method of this invention, but also provides strong technical support for the widespread application of polyurea wear-resistant corrugated sheets in practical applications.

[0015] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of producing a polyurea wear-resistant corrugated sheet, characterized by, The method comprises the following steps: I. Preparation of polyurea composite slurry A polyamine mixture is added to an aqueous solution of an organic solvent, a polyurea polymer is slowly added under stirring, and the mixture is uniformly stirred and stored at low temperature to obtain a polyurea composite slurry; II. Coating A diisocyanate, an organic tin catalyst, a metal alloy powder and an additive are added to the slurry of step I. at a ratio of 5% to 10% of the polyurea composite slurry, and the mixture is uniformly coated on the surface of the corrugated board substrate after being uniformly mixed; III. Shaping The corrugated board coated in step II. is dried at 50 to 80℃ to obtain the product.

2. The method for preparing the polyurea wear-resistant corrugated sheet according to claim 1, characterized in that, In step I., the polyamine mixture is a mixture of ethylenediamine and a triamino compound.

3. The method for preparing the polyurea wear-resistant corrugated sheet according to claim 2, characterized in that, In step I., the organic solvent is a combination of one or more of DMSO, DMAc and DMF.

4. The method for preparing the polyurea wear-resistant corrugated sheet according to claim 3, characterized in that, In step I., the weight of the polyurea accounts for 70% to 95% of the total weight of the polyurea composite slurry.

5. The method for preparing the polyurea wear-resistant corrugated sheet according to claim 1, characterized in that, In step II., the diisocyanate is one of MDI, HDI, TDI or IPDI.

6. The method for preparing the polyurea wear-resistant corrugated sheet according to claim 5, characterized in that, In step II., the amount of the metal alloy powder is 2% to 10% of the weight of the polyurea composite slurry, and the composition of the metal alloy powder comprises the following components by weight: 60% to 88% iron, 4% to 18% chromium, 6% to 15% phosphorus, 1% to 4% carbon, 0.5% to 1.5% silicon and 0.5% to 1.5% boron.

7. The method for preparing the polyurea wear-resistant corrugated sheet according to claim 5, characterized in that, The additive is one or more of a dispersant, a defoaming agent, a leveling agent and a pH regulator, and the amount of the additive is 3% to 7% of the weight of the polyurea composite slurry.

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