High-hardness stainless steel band

Abstract

The invention relates to a high-hardness stainless steel band which comprises a stainless steel band body and a high-hardness coating, and the high-hardness coating is formed after the surface of the stainless steel band body is coated with high-hardness paint. The high-hardness coating is prepared from the following components in parts by mass: 150 to 170 parts of resin matrix, 13 to 15 parts of carbon fiber filler, 1.5 to 2.5 parts of dispersing agent, 0.5 to 1 part of defoaming agent, 1 to 2 parts of silane coupling agent and 60 to 70 parts of curing agent, the carbon fiber filler comprises modified carbon fibers and a silicon dioxide component, and the modified carbon fibers comprise ceric ammonium nitrate, sodium alginate and carbon fibers. The surface of the stainless steel band body is coated with the high-hardness coating, so that the hardness and the antibacterial performance of the stainless steel band are improved.

Description

Technical Field

[0001] This application relates to the field of stainless steel strips, and more particularly to a high-hardness stainless steel strip. Background Technology

[0002] Stainless steel strip serves as a fundamental material for various product components. As a metallic material that combines excellent corrosion resistance, formability, and surface finish, stainless steel strip, with its stable chemical properties and sound mechanical properties, has been widely used in numerous fields such as electronics, automobile manufacturing, precision instruments, medical devices, kitchen and bathroom appliances, and food packaging.

[0003] In high-end machinery manufacturing, precision instruments, and some harsh working environments, stainless steel strips are required to have higher hardness to withstand greater pressure, wear, and impact.

[0004] During processing, transportation, assembly, and daily use, stainless steel strips may be scratched due to insufficient hardness, leaving marks. This not only seriously affects the appearance of the product, but for precision parts, surface scratches may also become the origin of stress corrosion cracking, reducing the reliability and service life of the product. Summary of the Invention

[0005] In order to improve the hardness of stainless steel strip, this application provides a high-hardness stainless steel strip.

[0006] This application provides a high-hardness stainless steel strip using the following technical solution: A high-hardness stainless steel strip includes a stainless steel strip body and a high-hardness coating. The high-hardness coating is formed by applying a high-hardness paint to the surface of the stainless steel strip body. The high-hardness paint comprises the following components in parts by weight: 150-170 parts resin matrix, 13-15 parts carbon fiber filler, 1.5-2.5 parts dispersant, 0.5-1 part defoamer, 1-2 parts silane coupling agent, and 60-70 parts curing agent; The carbon fiber filler includes modified carbon fiber and silica components, and the modified carbon fiber raw materials include cerium ammonium nitrate, sodium alginate and carbon fiber.

[0007] By adopting the above technical solution, a high-hardness coating is formed by coating the surface of the stainless steel strip with a high-hardness coating material. The high-hardness coating contains carbon fiber filler prepared by modified carbon fiber and silica components. The modified carbon fiber raw materials include cerium ammonium nitrate, sodium alginate, and carbon fiber. Cerium ammonium nitrate forms metal nanoparticles deposited on the surface of carbon fiber, thereby improving the roughness of carbon fiber. At the same time, after oxidizing carbon fiber, cerium ammonium nitrate generates oxygen-containing functional groups on the surface, which can form coordination bonds with metal ions and metal oxides, improving the interfacial bonding ability of carbon fiber and thus improving the bonding performance of carbon fiber in the high-hardness coating. Sodium alginate is a natural linear polysaccharide polymer and also contains abundant oxygen-containing functional groups, which improves the bonding performance of carbon fiber in the system. As a reinforcing material, carbon fiber forms a soft-hard bond structure with cerium ammonium nitrate and sodium alginate, thereby improving the interfacial stiffness of the obtained high-hardness coating and thus improving the strength of the stainless steel strip.

[0008] Preferably, the modified carbon fiber is prepared by the following method: Carbon fiber, cerium ammonium nitrate, and water were mixed, heated in a water bath, stirred, and then washed and dried to obtain a carbon fiber preform. Sodium alginate was mixed with water and stirred to obtain a sodium alginate solution. The carbon fiber preform was added to the sodium alginate solution, stirred, and then washed and dried to obtain a carbon fiber composite component.

[0009] By adopting the above technical solution, using cerium ammonium nitrate as the hard segment and sodium alginate as the soft matrix, a soft-hard bonded system is constructed on the carbon fiber surface through a self-assembly method, thereby enhancing the overall performance of the carbon fiber. This significantly improves the dispersion and bonding properties of the carbon fiber within the system, increases the hardness of the high-hardness coating, and simultaneously reduces the Ce content in cerium ammonium nitrate. 4+ After the particles are slowly released, they exhibit oxidative activity. The carboxyl groups of sodium alginate can disrupt the structure of microorganisms. The two work synergistically to inhibit bacterial growth and reduce the erosion of high-hardness coating surfaces by microorganisms and bacteria.

[0010] Preferably, the mass ratio of the carbon fiber, cerium ammonium nitrate and sodium alginate is 1:(0.6-0.8):0.9.

[0011] By adopting the above technical solution, and preferably within the above-mentioned range the mass ratio of carbon fiber, cerium ammonium nitrate and sodium alginate, the overall stability of the prepared modified carbon fiber can be further improved.

[0012] Preferably, the silica component raw materials include carboxymethyl chitosan, trans-2-hexenal, and mesoporous silica.

[0013] By employing the above technical solution, trans-2-hexenal exhibits excellent antibacterial activity, capable of disrupting cell membrane structure. When trans-2-hexenal is loaded into mesoporous silica, it is slowly released, synergistically interacting with metal ions in modified carbon fibers to achieve long-lasting antibacterial performance. The positively charged adsorption of cerium particles shortens the distance between trans-2-hexenal and the bacterial cell membrane. Simultaneously, Ce... 4 The oxidation of ⁺ damages the cell membrane, making it easier for the aldehyde group of trans-2-hexenal to enter the cell interior. Furthermore, the aldehyde group of trans-2-hexenal reacts with Ce... 4 ⁺ Further coordination and reaction with the active groups of the resin matrix to form continuous chemical bonds reduces interfacial stress and synergistically enhances the antibacterial and mechanical properties of the high-hardness coating; at the same time, mesoporous silica, under the modification of carboxymethyl chitosan, plays a good dispersing role and can also act as a filler to enhance the mechanical strength of the high-hardness coating.

[0014] Preferably, the silica component is prepared by the following method: Trans-2-hexenal was mixed with ethanol to obtain a trans-2-hexenal solution. Mesoporous silica was added to the hexenal solution and stirred. The mixture was then adsorbed and centrifuged under water bath conditions. The precipitate was collected, the supernatant was removed, and the precipitate was dried to obtain the silica-supported material. Carboxymethyl chitosan was mixed with water and stirred to obtain a carboxymethyl chitosan solution. The silica-supported material was added to the carboxymethyl chitosan solution and ultrasonically dispersed. Glutaraldehyde was added and the mixture was magnetically stirred to react. After the reaction, the mixture was centrifuged, the precipitate was collected, washed, and dried to obtain the silica component.

[0015] By adopting the above technical solution, trans-2-hexenal is first loaded into the pores of mesoporous silica through the adsorption effect of the pores, thereby initially fixing trans-2-hexenal. Then, through the coating effect of carboxymethyl chitosan, it is fixed on the surface of the composite, giving the system good compatibility, so that the silica component can be more stably dispersed in the high-hardness coating, thereby improving the overall stability of the system.

[0016] Preferably, the mass ratio of trans-2-hexenal, mesoporous silica and carboxymethyl chitosan is (1.2-1.4):1:0.3.

[0017] By adopting the above technical solution, and preferably within the above range the mass ratio of trans-2-hexenal, mesoporous silica and carboxymethyl chitosan, the overall stability of the prepared silica component can be further improved.

[0018] Preferably, the reaction temperature during magnetic stirring of the glutaraldehyde is 45-55℃.

[0019] By adopting the above technical solution, and preferably within the above-mentioned reaction temperature range, the overall stability of the prepared silica component can be further improved.

[0020] Preferably, the carbon fiber filler is prepared by the following method: The silica component was ultrasonically reacted with water to obtain a silica dispersion. The carbon fiber composite component was then added to the silica dispersion to react. After washing and drying, the carbon fiber filler was obtained.

[0021] By adopting the above technical solution, after combining modified carbon fiber with silica composite, the silica composite component acts as a mesoporous particle filler and the modified carbon fiber acts as a skeleton reinforcement, resulting in a good rigid filling network structure. This increases the density of the high-hardness coating and improves its mechanical properties. At the same time, the synergistic effect of sodium alginate, cerium nanoparticles, and trans-2-hexenal provides good long-lasting antibacterial properties, further enhancing the antibacterial performance of the stainless steel strip.

[0022] Preferably, the mass ratio of the silica component to the modified carbon fiber is 1:(3.3-3.7).

[0023] By adopting the above technical solution, and preferably within the above-mentioned range the mass ratio between silica component and modified carbon fiber, the overall stability of the prepared carbon fiber filler can be effectively improved.

[0024] In summary, this application includes at least one of the following beneficial technical effects: Cerium ammonium nitrate forms metal nanoparticles that deposit on the surface of carbon fibers, thereby increasing the roughness of the carbon fibers. Simultaneously, the oxidation of the carbon fiber surface by cerium ammonium nitrate generates oxygen-containing functional groups, which can form coordination bonds with metal ions and metal oxides, further enhancing the interfacial bonding ability of the carbon fibers. Sodium alginate, rich in oxygen-containing functional groups, further improves the bonding performance of carbon fibers in the system. The carbon fibers, cerium ammonium nitrate, and sodium alginate form a soft-hard bond structure, effectively improving the overall hardness of the high-hardness coating; furthermore, the Ce in cerium ammonium nitrate... 4+ After the particles are slowly released, they have oxidizing activity. The carboxyl groups of sodium alginate can destroy the structure of microorganisms. The two work together to inhibit bacteria and reduce the erosion of the high-hardness coating surface by microorganisms and bacteria. This makes the high-hardness coating on the surface of the stainless steel strip have good hardness and antibacterial properties. Trans-2-hexenal is loaded into the pores of mesoporous silica, and then coated with carboxymethyl chitosan, so that the silica composite component has good dispersion and antibacterial properties. Trans-2-hexenal is slowly released, which can play a long-lasting antibacterial role. By combining modified carbon fiber with a silica composite, the silica composite component acts as a mesoporous particle filler, while the modified carbon fiber acts as a skeleton reinforcement. The dispersion performance of the system is further improved by introducing a silane coupling agent, resulting in a well-structured rigid filling network. This increases the density of the high-hardness coating, thereby improving its mechanical properties. Simultaneously, the synergistic effect of sodium alginate, cerium nanoparticles, and trans-2-hexenal contributes to a long-lasting antibacterial effect, further enhancing the antibacterial properties of the stainless steel strip. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the embodiments: Raw material description: All raw materials in the examples are commercially available; the dispersant is BYK-163, the silane coupling agent is KH-550 (CAS No.: 919-30-2), the defoamer is BYK-052, the curing agent is isophorone diamine (CAS No.: 2855-13-2), and the stainless steel strip body is austenitic 304. Example 1

[0026] Preparation of silica components: 4.8 g of trans-2-hexenal (CAS No.: 6728-26-3) was mixed with 80 g of ethanol to obtain a trans-2-hexenal solution. 4 g of mesoporous silica was added to the hexenal solution. Under nitrogen protection, the mixture was magnetically stirred at 200 rpm for 20 min. Adsorption was then performed at 30 °C in a water bath for 4 h. The mixture was then centrifuged at 5000 rpm for 15 min, and the precipitate was collected. The supernatant was removed, and the precipitate was dried in a vacuum oven at 40 °C for 6 h to obtain the silica-supported product. 1.2 g of carboxymethyl chitosan (CAS No.: 83512-) was added... 85-0) was mixed with 20g of deionized water and stirred to obtain a carboxymethyl chitosan solution. The silica loading was added to the carboxymethyl chitosan solution and ultrasonically dispersed for 30min. Then, 0.2g of glutaraldehyde (CAS No.: 111-30-8) was added, and the mixture was magnetically stirred at 150rpm at 45℃ for 2h. During the stirring process, the pH of the system was adjusted to 6 using sodium hydroxide solution. After the reaction, the mixture was centrifuged at 6000rpm for 20min. The precipitate was collected and washed three times alternately with deionized water and ethanol. The precipitate was then dried in a vacuum drying oven at 50℃ for 8h to obtain the silica component.

[0027] Preparation of carbon fiber composite components: Carbon fibers were mixed with acetone solvent and refluxed for 48 hours. After removal, they were washed with deionized water and dried. 10g of the treated carbon fibers were mixed with 6g of cerium ammonium nitrate (CAS No.: 16774-21-3) and 150g of deionized water, heated in a water bath to 50°C, and stirred for 5 hours. Then, they were washed with deionized water and dried in a vacuum drying oven at 60°C to obtain a carbon fiber preform. 9g of sodium alginate (CAS No.: 9005-38-3) was mixed with 100g of water and stirred to obtain a sodium alginate solution. The carbon fiber preform was added to the sodium alginate solution, stirred, and reacted at 25°C for 5 hours. Then, it was washed with deionized water and dried in an oven at 40°C to obtain a carbon fiber composite component.

[0028] Preparation of carbon fiber fillers: 4.65g of silica component was mixed with 200g of deionized water and sonicated for 1h to obtain silica dispersion. 15.35g of carbon fiber composite component was added to silica dispersion and reacted for 2h. After washing with deionized water, the mixture was dried in an oven at 60℃ to obtain carbon fiber filler.

[0029] Preparation of high-hardness coatings: Mix 150g of epoxy resin, 1.5g of dispersant and 1g of silane coupling agent, and add the mixture to a high-speed disperser. Stir at 800rpm for 10min to obtain a resin matrix. While stirring, add 13g of carbon fiber filler to the resin matrix and disperse at 2000rpm for 30min. Then add 0.5g of defoamer and stir at 500rpm for 5min. Finally, add 60g of curing agent and stir for 8min to obtain a high-hardness coating.

[0030] Preparation of high-hardness stainless steel strip: After polishing the stainless steel strip body with 1000-grit sandpaper, wipe it with anhydrous ethanol, and dry it, apply a high-hardness coating to the surface of the stainless steel strip body, let it stand at room temperature for 1 hour to level it, and then heat it to 80℃ for curing. After curing, let it cool naturally to obtain a high-hardness stainless steel strip. Example 2

[0031] Preparation of silica components: 5.19 g of trans-2-hexenal was mixed with 80 g of ethanol to obtain a trans-2-hexenal solution. 3.7 g of mesoporous silica was added to the hexenal solution. Under nitrogen protection, the mixture was magnetically stirred at 200 rpm for 20 min. Adsorption was then performed at 30 °C in a water bath for 4 h. The mixture was then centrifuged at 5000 rpm for 15 min, and the precipitate was collected. The supernatant was removed, and the precipitate was dried in a vacuum oven at 40 °C for 6 h to obtain the silica-supported material. 1.11 g of carboxymethyl chitosan and 2... 0g of deionized water was mixed and stirred to obtain a carboxymethyl chitosan solution. The silica loading was added to the carboxymethyl chitosan solution and ultrasonically dispersed for 30 min. Then, 0.2g of glutaraldehyde was added, and the mixture was magnetically stirred at 150 rpm at 55℃ for 2 h. During stirring, the pH of the system was adjusted to 6 using sodium hydroxide solution. After the reaction, the mixture was centrifuged at 6000 rpm for 20 min. The precipitate was collected and washed three times alternately with deionized water and ethanol. The precipitate was then dried in a vacuum drying oven at 50℃ for 8 h to obtain the silica component.

[0032] Preparation of carbon fiber composite components: Carbon fiber was mixed with acetone solvent and refluxed for 48 hours. After removal, it was washed with deionized water and dried. 9.26g of the treated carbon fiber was mixed with 7.41g of cerium ammonium nitrate and 150g of deionized water, heated in a water bath to 50°C, and stirred for 5 hours. Then, it was washed with deionized water and dried in a vacuum drying oven at 60°C to obtain a carbon fiber preform. 8.33g of sodium alginate was mixed with 100g of water and stirred to obtain a sodium alginate solution. The carbon fiber preform was added to the sodium alginate solution, stirred, and reacted at 25°C for 5 hours. Then, it was washed with deionized water and dried in an oven at 40°C to obtain a carbon fiber composite component.

[0033] Preparation of carbon fiber fillers: 4.26g of silica component was mixed with 200g of deionized water and sonicated for 1h to obtain silica dispersion. 15.74g of carbon fiber composite component was added to silica dispersion and reacted for 2h. After washing with deionized water, it was dried in an oven at 60℃ to obtain carbon fiber filler.

[0034] Preparation of high-hardness coatings: Mix 170g of epoxy resin, 2.5g of dispersant and 2g of silane coupling agent, and add the mixture to a high-speed disperser. Stir at 800rpm for 10min to obtain a resin matrix. While stirring, add 15g of carbon fiber filler to the resin matrix and disperse at 2000rpm for 30min. Then add 1g of defoamer and stir at 500rpm for 5min. Finally, add 70g of curing agent and stir for 8min to obtain a high-hardness coating.

[0035] Preparation of high-hardness stainless steel strip: After polishing the stainless steel strip body with 1000-grit sandpaper, wipe it with anhydrous ethanol, and dry it, apply a high-hardness coating to the surface of the stainless steel strip body, let it stand at room temperature for 1 hour to level it, and then heat it to 80℃ for curing. After curing, let it cool naturally to obtain a high-hardness stainless steel strip. Example 3

[0036] Preparation of silica components: 5g of trans-2-hexenal was mixed with 80g of ethanol to obtain a trans-2-hexenal solution. 3.85g of mesoporous silica was added to the hexenal solution. Under nitrogen protection, the mixture was magnetically stirred at 200rpm for 20min. Adsorption was then performed at 30℃ in a water bath for 4h. The mixture was then centrifuged at 5000rpm for 15min, and the precipitate was collected. The supernatant was removed, and the precipitate was dried in a vacuum oven at 40℃ for 6h to obtain the silica-supported material. 1.15g of carboxymethyl chitosan and 20g of... The mixture of g of deionized water and stirred yielded a carboxymethyl chitosan solution. The silica loading was added to the carboxymethyl chitosan solution and ultrasonically dispersed for 30 min. Then, 0.2 g of glutaraldehyde was added, and the mixture was magnetically stirred at 150 rpm at 50 °C for 2 h. During stirring, the pH of the system was adjusted to 6 using sodium hydroxide solution. After the reaction, the mixture was centrifuged at 6000 rpm for 20 min. The precipitate was collected and washed three times alternately with deionized water and ethanol. The precipitate was then dried in a vacuum drying oven at 50 °C for 8 h to obtain the silica component.

[0037] Preparation of carbon fiber composite components: Carbon fiber was mixed with acetone solvent and refluxed for 48 hours. After removal, it was washed with deionized water and dried. 9.62g of the treated carbon fiber was mixed with 6.73g of cerium ammonium nitrate and 150g of deionized water, heated in a water bath to 50°C, and stirred for 5 hours. Then, it was washed with deionized water and dried in a vacuum drying oven at 60°C to obtain a carbon fiber preform. 8.65g of sodium alginate was mixed with 100g of water and stirred to obtain a sodium alginate solution. The carbon fiber preform was added to the sodium alginate solution, stirred, and reacted at 25°C for 5 hours. Then, it was washed with deionized water and dried in an oven at 40°C to obtain a carbon fiber composite component.

[0038] Preparation of carbon fiber fillers: 4.44g of silica component was mixed with 200g of deionized water and sonicated for 1h to obtain silica dispersion. 15.56g of carbon fiber composite component was added to silica dispersion and reacted for 2h. After washing with deionized water, it was dried in an oven at 60℃ to obtain carbon fiber filler.

[0039] Preparation of high-hardness coatings: Mix 160g of epoxy resin, 2g of dispersant and 1.5g of silane coupling agent, and add the mixture to a high-speed disperser. Stir at 800rpm for 10min to obtain a resin matrix. While stirring, add 14g of carbon fiber filler to the resin matrix and disperse at 2000rpm for 30min. Then add 0.7g of defoamer and stir at 500rpm for 5min. Finally, add 65g of curing agent and stir for 8min to obtain a high-hardness coating.

[0040] Preparation of high-hardness stainless steel strip: After polishing the stainless steel strip body with 1000-grit sandpaper, wipe it with anhydrous ethanol, and dry it, apply a high-hardness coating to the surface of the stainless steel strip body, let it stand at room temperature for 1 hour to level it, and then heat it to 80℃ for curing. After curing, let it cool naturally to obtain a high-hardness stainless steel strip. Example 4

[0041] Example 4 is based on Example 3. In Example 4, when preparing the silica component, the amount of trans-2-hexenal used is 4.09g, the amount of mesoporous silica is 4.55g, and the amount of carboxymethyl chitosan is 1.36g. Example 5

[0042] Example 5 is based on Example 3. In Example 5, when preparing the silica component, the amount of trans-2-hexenal used is 5.67g, the amount of mesoporous silica is 3.33g, and the amount of carboxymethyl chitosan is 1g. Example 6

[0043] Example 6 is based on Example 3. In Example 6, the reaction temperature after adding glutaraldehyde during the preparation of the silica component is 40°C. Example 7

[0044] Example 7 is based on Example 3. In Example 7, the reaction temperature after adding glutaraldehyde during the preparation of the silica component is 60°C. Example 8

[0045] Example 8 is based on Example 3. In Example 8, when preparing modified carbon fiber, the amount of carbon fiber used is 10.87g, cerium ammonium nitrate is 4.35g, and sodium alginate is 9.78g. Example 9

[0046] Example 9 is based on Example 3. In Example 9, when preparing modified carbon fiber, the amount of carbon fiber used is 8.62g, the amount of cerium ammonium nitrate is 8.62g, and the amount of sodium alginate is 7.76g. Example 10

[0047] Example 10 is based on Example 3. In Example 10, when preparing the carbon fiber filler, the silica component used is 5.26g and the modified carbon fiber is 14.74g. Example 11

[0048] Example 11 is based on Example 3. In Example 11, when preparing the carbon fiber filler, the silica component used is 3.85g and the modified carbon fiber is 16.15g. Example 12

[0049] Example 12 is based on Example 3. The silica component in Example 12 is a silica-supported material, and carboxymethyl chitosan is not used. Example 13

[0050] Example 13 is based on Example 3, and the silica component in Example 13 is ordinary mesoporous silica.

[0051] Comparative Example 1 Comparative Example 1 is based on Example 3, but sodium alginate was not used in the preparation of the modified carbon fiber in Comparative Example 1.

[0052] Comparative Example 2 Comparative Example 2 is based on Example 3, but cerium ammonium nitrate was not used in the preparation of the modified carbon fiber in Comparative Example 2.

[0053] Comparative Example 3 Comparative Example 3 is based on Example 3, in which the modified carbon fiber was replaced with an equal amount of unmodified ordinary carbon fiber when preparing the carbon fiber filler.

[0054] Performance testing Samples from Examples 1-13 and Comparative Examples 1-3 were taken, with a total sample thickness of 1.0 mm. The sampled samples were subjected to the following performance tests: (1) Antibacterial properties Antibacterial properties were tested using Escherichia coli and Staphylococcus aureus at a bacterial concentration of 10 CFU / mL. The inhibition rate of the samples was then tested after 14 days. Each sample was tested three times, and the average value was taken. The test results were recorded in Table 1.

[0055] (2) Mechanical strength The hardness of each sample was tested using a Rockwell hardness tester, and the test results were recorded in Table 1. The impact toughness of the samples was tested using GB / T 229-2007 Metallic Materials Impact Test Method as the test reference. Each sample was tested three times, and the test results were recorded in Table 1.

[0056] Table 1 Performance test results of Examples 1-13 and Comparative Examples 1-3

[0057] As shown in Table 1, in Examples 1-3, the inhibition rates of Staphylococcus aureus and Escherichia coli were all above 99.9%, and after 14 days, the inhibition rates of Staphylococcus aureus and Escherichia coli were all above 98.2%, indicating that the stainless steel strip prepared in this application has good antibacterial properties and long-lasting antibacterial properties. The hardness of Examples 1-3 was all above 63 HRC, and the impact toughness was all above 235 J, indicating that the stainless steel strip prepared in this application has good hardness.

[0058] In Examples 4 and 5, the mass ratios of trans-2-hexenal, mesoporous silica, and carboxymethyl chitosan during the preparation of the silica component were not within the range specified in this application. When the content of trans-2-hexenal was too low, the pores of the mesoporous silica could not be fully filled, resulting in a decrease in the effective antibacterial components and thus affecting the antibacterial performance and long-term antibacterial properties of the system. When the amount of trans-2-hexenal used was too high, the excess trans-2-hexenal could not be fully filled into the pores of the mesoporous silica, leading to the adsorption of trans-2-hexenal. The trans-2-hexenal migrates to the outer surface of the mesoporous silica and interferes with the network formed by the cross-linking of carboxymethyl chitosan, thus reducing the coating stability of carboxymethyl chitosan. This makes it difficult for trans-2-hexenal to maintain its antibacterial properties for a long time, affecting the antibacterial rate. The free trans-2-hexenal also migrates to the surface of the high-hardness coating and the stainless steel strip body, and it is difficult for it to synergistically improve the antibacterial and mechanical properties of the system with cerium ammonium nitrate, affecting the adhesion rate of the high-hardness coating and reducing the overall stability of the system. Therefore, the antibacterial performance, hardness and impact toughness are all reduced.

[0059] In Examples 6 and 7, the reaction temperatures after adding glutaraldehyde during the preparation of the silica component were not within the range specified in this application. When the reaction temperature was too low, the reaction rate was affected, making it difficult to form a tight network structure, reducing the bonding stability, and resulting in an overly loose shell layer. This caused the release of trans-2-hexenal to be too rapid, making it difficult to achieve a long-lasting antibacterial effect and affecting the overall mechanical strength of the system. When the reaction temperature was too high, the crosslinking uniformity of carboxymethyl chitosan decreased, making it difficult to form a uniform network structure. At the same time, the shell layer became too brittle, causing cracks in the high-hardness coating and affecting the stability of the high-hardness coating. Therefore, the performance of Examples 6 and 7 was reduced.

[0060] In Examples 8 and 9, the carbon fibers, cerium ammonium nitrate, and sodium alginate used in the preparation of modified carbon fibers are not within the scope defined in this application. When the content of cerium ammonium nitrate is too low, it is difficult to form sufficient Ce particles on the surface of the carbon fibers, which affects the overall antibacterial performance of the system. At the same time, the bonding force between the carbon fibers and the sodium alginate coating layer decreases, the sodium alginate falls off, and the bonding performance between the various components decreases, affecting the stability of the system. When the content of cerium ammonium nitrate is too high, the generated Ce particles agglomerate in the system, which also affects the overall stability of the system. Furthermore, it is difficult for them to synergistically improve the antibacterial and mechanical properties with trans-2-hexenal. At the same time, the sodium alginate is over-crosslinked, the modified carbon fibers are too brittle, and cracks appear in the high-hardness coating. Therefore, the mechanical strength of Examples 8 and 9 is reduced.

[0061] In Examples 10 and 11, the mass ratio between silica components and modified carbon fibers during the preparation of carbon fiber fillers was outside the range defined in this application. When the content of modified carbon fibers decreased, the content of sodium alginate also decreased, making it difficult to further hinder the aggregation of silica. The silica components agglomerated, making it difficult to form a stable network structure. At the same time, excessive silica content resulted in excessive brittleness, causing cracks in the high-hardness coating and affecting the overall stability of the system. Furthermore, the silica components were difficult to distribute uniformly, resulting in some parts having excessively strong antibacterial properties while others were too weak, thus affecting the antibacterial performance. When the content of modified carbon fibers was excessive, the content of silica components was insufficient, leading to a decrease in the effective antibacterial components and affecting the antibacterial performance of the system. Simultaneously, excessive modified carbon fibers, due to the entanglement of polysaccharide chains from ammonium alginate, resulted in decreased fluidity and agglomerated, also affecting the mechanical properties. Therefore, the performance of Examples 10 and 11 was reduced.

[0062] In Example 12, no carboxymethyl chitosan was added to the silica component, making it difficult to improve the surface energy of the silica component. As agglomeration occurred in the system, both mechanical strength and antibacterial properties decreased.

[0063] In Example 13, the silica component was replaced with ordinary mesoporous silica. Ordinary mesoporous silica is difficult to disperse in the system and tends to agglomerate. It also lacks the effective antibacterial component of trans-2-hexenal, making it difficult to achieve good antibacterial performance and long-lasting antibacterial effect. Therefore, the antibacterial performance and mechanical strength of Example 13 were both reduced.

[0064] In Comparative Example 1, sodium alginate was not used when preparing the modified carbon fiber. The carbon fiber without sodium alginate has poor surface polarity and is difficult to disperse in the coating system. This results in a decrease in the bonding performance between the high-hardness coating and the stainless steel strip body, and delamination occurs between the coating and the silica component, making it difficult to synergistically improve mechanical and antibacterial properties.

[0065] In Comparative Example 2, the modified carbon fiber did not use cerium ammonium nitrate, making it difficult to attach metal nanoparticles to the carbon fiber surface. The coordination bond between the modified carbon fiber and sodium alginate decreased, resulting in a decrease in the stability of the modified carbon fiber and agglomeration in the system. This also caused the silica component to agglomerate, and it was difficult for it to coordinate with trans-2-hexenal. Both the antibacterial properties and mechanical properties were affected.

[0066] In Comparative Example 3, when the modified carbon fiber was replaced with ordinary carbon fiber during the preparation of the carbon fiber filler, the dispersion and bonding properties of ordinary carbon fiber in the coating system decreased significantly, which reduced the uniformity of the high-hardness coating and affected the overall mechanical strength and antibacterial properties of the system.

[0067] This specific embodiment is merely an explanation of this application and is not intended to limit it. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification but must be determined according to the scope of the claims.

Claims

1. A high hardness stainless steel strip, characterized by: The high-hardness coating is formed after a high-hardness coating material is applied to the surface of the stainless steel belt body, and the high-hardness coating material comprises the following components by mass fraction: The resin matrix is 150-170 parts, the carbon fiber filler is 13-15 parts, the dispersing agent is 1.5-2.5 parts, the defoaming agent is 0.5-1 part, the silane coupling agent is 1-2 parts, and the curing agent is 60-70 parts. The carbon fiber filler comprises a modified carbon fiber and a silica component, and the raw material of the modified carbon fiber comprises cerium ammonium nitrate, sodium alginate and carbon fiber.

2. The high-hardness stainless steel strip according to claim 1, characterized in that: The modified carbon fiber is prepared by the following method: The carbon fiber, cerium ammonium nitrate and water are mixed, heated in a water bath and stirred to react, washed and dried to obtain a carbon fiber preform; sodium alginate and water are mixed and stirred to obtain a sodium alginate solution, the carbon fiber preform is added to the sodium alginate solution, stirred and reacted, then washed and dried to obtain a carbon fiber composite component.

3. The high-hardness stainless steel strip according to claim 2, characterized in that: The mass ratio of the carbon fiber, cerium ammonium nitrate and sodium alginate is 1:(0.6-0.8):0.

9.

4. The high hardness stainless steel strip of claim 1, wherein: The raw material of the silica component comprises carboxymethyl chitosan, trans-2-hexenal and mesoporous silica.

5. The high-hardness stainless steel strip according to claim 4, characterized in that: The silica component is prepared by the following method: Trans-2-hexenal and ethanol are mixed to obtain a trans-2-hexenal solution, mesoporous silica is added to the hexenal solution and stirred, then adsorbed and centrifuged under water bath conditions, the supernatant is removed after the precipitate is collected, and the silica support is obtained by drying; carboxymethyl chitosan and water are mixed and stirred to obtain a carboxymethyl chitosan solution, the silica support is added to the carboxymethyl chitosan solution, ultrasonically dispersed, glutaraldehyde is added and magnetically stirred to react, centrifuged after reaction, washed and dried after the precipitate is collected, and the silica component is obtained.

6. The high-hardness stainless steel strip according to claim 5, characterized in that: The mass ratio of the trans-2-hexenal, mesoporous silica and carboxymethyl chitosan is (1.2-1.4):1:0.

3.

7. The high hardness stainless steel strip of claim 5, wherein: The reaction temperature of the glutaraldehyde after magnetic stirring is 45-55℃.

8. The high hardness stainless steel strip of claim 1, wherein: The carbon fiber filler is prepared by the following method: The silica component and water are ultrasonically dispersed to obtain a silica dispersion liquid, the carbon fiber composite component is added to the silica dispersion liquid to react, washed and dried to obtain the carbon fiber filler.

9. The high hardness stainless steel strip of claim 1, wherein: The mass ratio of the silica component and the modified carbon fiber is 1:(3.3-3.7).

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