Highly wear-resistant steel structural component

Abstract

The application relates to a high-wear-resistant steel structure piece, which comprises a steel structure piece base body, a metal plating layer and a wear-resistant coating layer, the wear-resistant coating layer is obtained by coating wear-resistant paint, and the raw materials for preparing the wear-resistant paint comprise the following components in mass fraction: 40-60 parts of silane-modified polyol, 20-30 parts of diphenyl methane diisocyanate, 5-15 parts of fluorine-modified silicon carbide chain extender, 10-20 parts of rare earth oxide filler, 0.1-0.2 parts of a catalyst, 0.4-0.8 parts of a defoaming agent and 20-40 parts of a solvent. The application has the effects of improving the wear-resistant performance and corrosion-resistant performance of the steel structure piece, and the high-wear-resistant steel structure piece can maintain good working performance for a long time under complex working conditions.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of steel structural member manufacturing, and in particular to a high-wear-resistance steel structural member. BACKGROUND

[0002] In many industrial fields, steel structural members are widely used. For example, in the mining industry, a large number of steel structural members are used in crushing machines and screening machines; in the field of building construction, key components such as tower cranes and hoists are also steel structures; and in the transportation industry, vehicle chassis and bridge support structures are also steel structures. The working environment in these fields is often harsh, and the steel structural members are subjected to different degrees of friction, impact and wear, which puts high requirements on their wear resistance.

[0003] Traditional steel structural members are usually made of ordinary steel and are subjected to simple surface treatment processes, such as simple anti-rust paint spraying or galvanizing. In terms of wear resistance, the hardness and wear resistance of ordinary steel are limited, and under high-load friction and impact, surface wear, deformation and even failure can easily occur. Although some simple surface treatment methods can prevent corrosion to some extent, they do not significantly improve wear resistance and cannot meet the needs of long-term stable operation, so there is room for improvement. SUMMARY

[0004] In order to improve the wear resistance of steel structural members, the application provides a high-wear-resistance steel structural member.

[0005] The high-wear-resistance steel structural member provided by the application adopts the following technical scheme:

[0006] A high-wear-resistance steel structural member includes a steel structural member base, a metal plating layer and a wear-resistant coating, the wear-resistant coating is obtained by coating wear-resistant paint, and the preparation raw materials of the wear-resistant paint include the following components in mass fraction:

[0007] Silane-modified polyol 40-60 parts

[0008] Diphenyl methane diisocyanate 20-30 parts

[0009] Fluorine-modified silicon carbide chain extender 5-15 parts

[0010] Rare earth oxide filler 10-20 parts

[0011] Catalyst 0.1-0.2 parts

[0012] Defoaming agent 0.4-0.8 parts

[0013] Solvent 20-40 parts.

[0014] By setting a metal plating layer on the substrate of the steel structural member, the erosion of the substrate by the external environment can be blocked, and a good adhesion base for the subsequent coating is provided; the silane-modified polyol in the wear-resistant coating interacts with the diphenyl methane diisocyanate to form a polyurethane network structure, which has high hardness and good flexibility, and can effectively resist wear and tear during friction; the addition of fluorine-modified silicon carbide chain extender further enhances the cross-linking degree of the coating, improves the wear resistance and hardness of the coating, and the contained fluorine element can also reduce the adhesion of dust, water vapor and other substances, thereby improving the corrosion resistance; the rare earth oxide filler, with high hardness and chemical stability, plays a role in enhancing the wear resistance of the coating, and its redox activity can also inhibit the occurrence of corrosion reaction, further improving the corrosion resistance of the steel structural member; the synergistic effect of each component in the high-corrosion-resistant steel structural member can significantly improve the wear resistance and corrosion resistance of the steel structural member in complex use environment, prolong its service life, and reduce maintenance costs.

[0015] Preferably, the raw materials for preparing the silane-modified polyol include cage silsesquioxane, bis-aminosilane coupling agent and polybutylene adipate diol.

[0016] The cage silsesquioxane has a nanoscale cage structure and can be used as a rigid nanofiller to enhance the hardness of the coating and disperse external forces during friction to reduce wear; the bis-aminosilane coupling agent reacts with the active groups on the cage silsesquioxane, successfully introducing active groups into the cage structure, enhancing the reactivity of the cage silsesquioxane with the polyol, and enabling it to more closely and efficiently chemically bond with the polybutylene adipate diol to form a highly cross-linked and stable structure. This structure can effectively improve the hardness and toughness of the coating, enabling it to better disperse and withstand external forces during friction and reduce wear; the tightly cross-linked structure effectively blocks the intrusion of corrosive media from the outside, while enhancing the adhesion of the coating to the substrate of the steel structural member, preventing the coating from peeling off and exposing the substrate to the corrosive environment, thereby significantly prolonging the service life of the steel structural member in harsh environments.

[0017] Preferably, the mass ratio of the cage silsesquioxane, bis-aminosilane coupling agent and polybutylene adipate diol is 1:0.13:(15-20).

[0018] The silane-modified polyol prepared according to the above mass ratio has good performance and can effectively improve the wear resistance and corrosion resistance of the steel structural member.

[0019] Preferably, the raw materials for preparing the fluorine-modified nanoscale silicon carbide chain extender include nanoscale silicon carbide, perfluorooctyltrichlorosilane and decanediamine.

[0020] The perfluorooctyltrichlorosilane reacts with decanediamine to generate a silane coupling agent containing active amino group, which further reacts with the hydroxyl group on the surface of nano silicon carbide, successfully introducing fluorine element into the nano silicon carbide structure, and at the same time making the surface of nano silicon carbide exist long-chain amino group, which can be used as a chain extender to introduce nano silicon carbide into the side chain of polyurethane, reinforce the defects in the molecular chain, form a more stable and high-strength crosslinking network, so that the high hardness characteristics of nano silicon carbide can be fully played, effectively resisting the scratching and wear of abrasives, and enhancing the wear resistance of the coating; the introduction of fluorine element reduces the surface energy of the coating, so that the corrosive medium is difficult to adhere and penetrate on the surface of the coating, at the same time, the stable structure formed by the chain extender can effectively block the invasion of water, oxygen, acid and alkali and other corrosive substances from the outside into the steel structure part matrix, thereby significantly improving the corrosion resistance of the steel structure part in harsh environment and prolonging its service life.

[0021] Preferably, the mass ratio of the nano silicon carbide, perfluorooctyltrichlorosilane and decanediamine is (4-5):1:0.36.

[0022] Preferably, the fluorine-modified nano silicon carbide chain extender is prepared by the following steps:

[0023] The perfluorooctyltrichlorosilane and decanediamine are mixed and dispersed in toluene, stirred under the protection of neutral gas, and reacted by heating. After cooling, the solvent is removed by rotary evaporation to obtain a crude product, which is recrystallized to obtain a modified fluorine-containing silane. The nano silicon carbide and the modified fluorine-containing silane prepared above are mixed and dispersed in toluene, water is added, and the mixture is stirred and reacted by heating. After cooling, centrifugation, washing and drying, the fluorine-modified nano silicon carbide chain extender is obtained.

[0024] The fluorine-modified nano silicon carbide chain extender prepared according to the above mass ratio and steps can effectively reinforce the polyurethane molecules, thereby improving the wear resistance and corrosion resistance of the high-wear-resistant steel structure.

[0025] Preferably, the preparation raw materials of the rare earth oxide filler include cerium oxide, lanthanum oxide and a coating polymer.

[0026] The cerium oxide and lanthanum oxide have high hardness and good chemical stability, the coating polymer is wrapped on the surface of the rare earth oxide by chemical bonding or physical adsorption, and the dispersion performance is improved; when the steel structure is subjected to friction, the rare earth oxide can effectively resist wear as a hard point, the coating polymer can enhance the compatibility of the rare earth oxide with other components in the coating system, the filler is more uniformly dispersed in the system, and the overall wear resistance is further improved; the cerium oxide and lanthanum oxide have certain oxidation resistance and corrosion resistance, can inhibit the occurrence of corrosion reaction, and the coating polymer forms a protective film to prevent the direct contact of the external corrosive medium with the rare earth oxide and the steel structure substrate, thereby synergistically enhancing the corrosion resistance of the steel structure, so that the steel structure can maintain good performance in complex and harsh environments, and the service life is prolonged.

[0027] Preferably, the preparation raw material of the coating polymer includes polyaspartic acid and polyquaternary ammonium salt.

[0028] The polyaspartic acid contains rich active functional groups such as carboxyl groups, can interact with the hydroxyl groups and other groups on the surface of the rare earth oxide by chemical bonding, realize preliminary coating, increase the stability and dispersion of the rare earth oxide in the coating system, thereby help to improve the wear resistance of the steel structure when it is subjected to friction, and make the rare earth oxide more effectively resist wear; the polyquaternary ammonium salt has cationic characteristics, and there is electrostatic attraction and other interactions between the polyquaternary ammonium salt and the polyaspartic acid, further strengthen the coating layer, form a more compact and stable structure, at the same time, the cationic groups can adsorb anionic corrosive medium in the environment, play a corrosion inhibition effect, and at the same time, this compact coating structure can also prevent the penetration of external moisture, oxygen and other corrosive substances to the surface of the rare earth oxide and the steel structure substrate, enhance the corrosion resistance of the steel structure, and ensure its long-term stable operation under complex working conditions.

[0029] Preferably, the metal plating layer includes nickel-chromium alloy and polytetrafluoroethylene particles.

[0030] The nickel-chromium alloy has good corrosion resistance and hardness, can provide a preliminary protective barrier for the steel structure substrate, effectively resist the erosion of moisture, oxygen and some corrosive chemicals in the external environment, slow down the corrosion speed of the substrate, at the same time, the hardness of the nickel-chromium alloy also helps to improve the wear resistance of the steel structure, and helps to resist the damage caused by friction; the polytetrafluoroethylene particles further optimize the performance of the plating layer, the polytetrafluoroethylene has extremely low friction coefficient, when the steel structure is subjected to friction, these particles can play a lubricating role on the surface, reduce the friction resistance, reduce the degree of wear, and enhance the wear resistance of the plating layer; in addition, the polytetrafluoroethylene particles also have good chemical stability and non-stickness, can prevent the adhesion and accumulation of corrosive medium on the surface of the plating layer, and synergistically act with the nickel-chromium alloy, further improve the corrosion resistance of the plating layer.

[0031] Preferably, the high wear-resistant steel structure is prepared by the following steps:

[0032] The steel structure substrate is degreased and soaked in a dilute hydrochloric acid solution to obtain an activated steel structure; an electroplating solution is prepared, the electroplating solution comprising nickel sulfate, chromic anhydride, sodium sulfate, boric acid and polytetrafluoroethylene particles, and the electroplating solution is obtained by ultrasonic treatment; the activated steel structure is used as a cathode and a nickel-chromium alloy is used as an anode, and the electroplating solution is stirred during electroplating to obtain a steel structure with a metal plating layer; and the steel structure with the metal plating layer is coated with a wear-resistant coating, and after heating and curing, a high wear-resistant steel structure is obtained.

[0033] The high wear-resistant steel structure prepared according to the above steps has good corrosion resistance and wear resistance, and can maintain good working performance for a long time in complex working conditions.

[0034] In summary, the present application has at least one of the following beneficial technical effects:

[0035] By providing a metal plating layer on the steel structure substrate, the erosion of the substrate by the external environment can be blocked, and a good adhesion base is provided for the subsequent coating; the silane-modified polyol and the diphenyl methane diisocyanate in the wear-resistant coating interact to form a polyurethane network structure, which has high hardness and good flexibility, and can effectively resist wear during friction; the addition of fluorine-modified silicon carbide chain extender further enhances the crosslinking degree of the coating, improves the wear resistance and hardness of the coating, and the fluorine element contained therein can also reduce the surface energy of the coating, reduce the adhesion of dust, water vapor and the like, thereby improving the corrosion resistance; the rare earth oxide filler has high hardness and chemical stability, and plays a role in enhancing the wear resistance of the coating, and its redox activity can also inhibit the occurrence of corrosion reaction, further improving the corrosion resistance of the steel structure; the synergistic effect of the various components in the high corrosion-resistant steel structure can significantly improve the wear resistance and corrosion resistance of the steel structure in complex use environments, prolong the service life of the steel structure, and reduce maintenance costs.

[0036] The cage-shaped silsesquioxane has a nanoscale cage structure, can be used as a rigid nanofiller to enhance the hardness of the coating, and can disperse external force when rubbing to reduce wear and tear; the diamino silane coupling agent reacts with the active groups on the cage-shaped silsesquioxane, successfully introducing the active groups into the cage structure, enhancing the reactivity of the cage-shaped silsesquioxane with polyols, enabling it to more closely and efficiently chemically bond with polybutylene adipate glycol to form a highly cross-linked and stable structure, which can effectively improve the hardness and toughness of the coating, enabling it to better disperse and withstand external force when rubbing, reducing wear and tear; the tightly cross-linked structure effectively blocks the intrusion of corrosive media from the outside, while enhancing the adhesion of the coating to the steel structure substrate, preventing the coating from peeling off and exposing the substrate to a corrosive environment, thereby significantly extending the service life of the steel structure in harsh environments.

[0037] The perfluorooctyltrichlorosilane reacts with decanediamine to form a silane coupling agent containing active amino groups, which further reacts with the hydroxyl groups on the surface of the nanoscale silicon carbide, successfully introducing fluorine elements into the structure of the nanoscale silicon carbide, while making the surface of the nanoscale silicon carbide contain long-chain amino groups, which can act as a chain extender to introduce the nanoscale silicon carbide into the side chain of polyurethane, reinforcing the defects in the molecular chain, forming a more stable and high-strength cross-linked network, enabling the high hardness characteristics of the nanoscale silicon carbide to be fully utilized, effectively resisting the scratching and wear of abrasives, and enhancing the wear resistance of the coating; the introduction of fluorine elements reduces the surface energy of the coating, making it difficult for corrosive media to adhere and penetrate the coating surface, and at the same time, the stable structure formed by the chain extender can effectively block the intrusion of water, oxygen, and acid and alkali and other corrosive substances from the outside into the steel structure substrate, thereby significantly improving the corrosion resistance of the steel structure in harsh environments and extending its service life. DETAILED DESCRIPTION

[0038] The present application discloses a kind of high wear-resistant steel structure, the raw material used in the present application can be obtained by marketable raw material except special description, the following is further detailed in the present application with example:

[0039] Raw material description: cage silsesquioxane (CAS: 160185-24-0), bisamino silane coupling agent is KH-792 (CAS number: 1760-24-3), dibutyl tin dilaurate (CAS number: 77-58-7), polybutylene adipate glycol (CAS number: 150923-12-9), molecular weight is 2000, dibutyl tin oxide (CAS number: 818-08-6), perfluorooctyltrichlorosilane (CAS number: 78560-45-9), decanediamine (CAS number: 646-25-3), nano silicon carbide particle size is 50 nm, polyaspartic acid (CAS number: 25608-40-6), molecular weight is 1000, polyquaternary ammonium salt is polydimethyl diallyl ammonium chloride (CAS number: 26062-79-3), diphenylmethane diisocyanate (CAS number: 26447-40-5), solvent is N, N-dimethylformamide, catalyst is dibutyl tin dilaurate, defoaming agent type is AKN-3386, purchased from Foshan Qianyou Chemical Co., Ltd., polytetrafluoroethylene particle size is 0.1 μm, octyltrichlorosilane (CAS: 5283-66-9).

[0040] Example 1

[0041] Preparation of silane modified polyol

[0042] 6.2 g of cage silsesquioxane and 0.8 g of bisamino silane coupling agent were dispersed into 20 mL of N, N-dimethylformamide, stirred at 200 rpm for 15 min under nitrogen protection, to obtain a silane modified liquid; 0.1 g of dibutyl tin dilaurate was added to the silane modified liquid, heated to 80°C, and stirred at 200 rpm for 4 h to obtain a preliminary modification; 93 g of polybutylene adipate glycol and 0.5 g of dibutyl tin oxide were added to the preliminary modification, stirred at 300 rpm for 15 min under nitrogen protection, heated to 140°C and reacted for 8 h, cooled to below 30°C, and the solvent was removed by reduced pressure distillation, washed with ethanol, and dried at 60°C under vacuum to obtain a modified polyol.

[0043] Preparation of fluorine modified nano silicon carbide chain extender

[0044] Mix and disperse 3.73 g of perfluorooctyltrichlorosilane and 1.34 g of decanediamine into 20 mL of toluene, stir at 300 rpm for 15 min under nitrogen protection, heat to 60 °C and react for 6 h, after cooling to below 30 °C, remove the solvent by rotary evaporation to obtain a crude product, recrystallize the crude product to obtain a modified fluorine-containing silane; mix and disperse 14.93 g of nanometer silicon carbide and the modified fluorine-containing silane prepared above into 50 mL of toluene, add 2 mL of deionized water, heat to 80 °C and stir at 500 rpm for 6 h, after cooling to below 30 °C, centrifuge, wash with anhydrous ethanol, and dry at 60 °C under vacuum to obtain a fluorine-modified nanometer silicon carbide chain extender.

[0045] Preparation of rare earth oxide filler

[0046] Grind cerium oxide and lanthanum oxide separately through a 200-mesh sieve to obtain pretreated cerium oxide and lanthanum oxide; take the pretreated cerium oxide and lanthanum oxide and mix them in a mass ratio of 1:1 to obtain a rare earth mixture, mix and disperse 50 g of the rare earth mixture and 10 g of polyaspartic acid into 100 mL of deionized water, heat to 60 °C and stir at 500 rpm for 4 h to obtain a preliminary modified suspension; disperse 15 g of polydimethyl diallyl ammonium chloride into 30 mL of deionized water to obtain a polyquaternary ammonium salt solution, add the preliminary modified suspension dropwise into the polyquaternary ammonium salt solution, and complete the dropwise addition within 1 h, heat to 80 °C and react for 4 h after the dropwise addition is completed, centrifuge to obtain a precipitate after cooling to 300 °C, wash the precipitate with deionized water, and dry at 60 °C to obtain a rare earth oxide filler.

[0047] Preparation of wear-resistant coating

[0048] Mix and disperse 40 g of silane-modified polyol, 20 g of diphenylmethane diisocyanate, and 5 g of fluorine-modified silicon carbide chain extender into 20 g of solvent, add 0.1 g of catalyst, heat to 80 °C and stir at 500 rpm for 3 h to obtain a prepolymer; add 10 g of rare earth oxide filler to the prepolymer, stir at 1000 rpm for 30 min, add 0.4 g of defoaming agent, and stir at 500 rpm for 15 min to obtain a coating, pass the coating through a 100-mesh filter screen to obtain a wear-resistant coating.

[0049] Preparation of high-wear-resistant steel structural part

[0050] The steel structural part substrate is degreased, soaked in a dilute hydrochloric acid solution with a mass concentration of 5% for 3 minutes to obtain an activated steel structural part; an electroplating solution is prepared, the electroplating solution is an aqueous solution, the electroplating solution comprises nickel sulfate 300 g / L, chromic anhydride 200 g / L, sodium sulfate 50 g / L, boric acid 30 g / L, and polytetrafluoroethylene particles 10 g / L, and the electroplating solution is ultrasonically treated for 30 minutes to obtain the electroplating solution; the activated steel structural part is used as a cathode, a nickel-chromium alloy is used as an anode, the electroplating solution is stirred at a speed of 200 rpm, the current density is 4 A / dm2, the electroplating temperature is 60°C, and the electroplating time is 30 minutes to obtain a steel structural part with a metal plating layer; and wear-resistant paint is coated on the surface of the steel structural part with the metal plating layer, and the steel structural part is heated and cured at 100°C for 2 hours to obtain a high-wear-resistant steel structural part.

[0051] Example 2

[0052] Preparation of silane-modified polyol

[0053] 4.73 g of cage silsesquioxane and 0.62 g of a diamino silane coupling agent are dispersed in 20 mL of N,N-dimethylformamide, stirred at a speed of 200 rpm for 15 minutes under nitrogen protection to obtain a silane modification solution; 0.1 g of dibutyltin dilaurate is added to the silane modification solution, heated to 80°C, and stirred at a speed of 200 rpm for 4 hours to obtain a preliminary modification product; 94.65 g of polybutylene adipate glycol and 0.5 g of dibutyl tin oxide are added to the preliminary modification product, stirred at a speed of 300 rpm for 15 minutes under nitrogen protection, heated to 140°C and reacted for 8 hours, cooled to below 30°C, and the solvent was removed by reduced pressure distillation, washed with ethanol, and vacuum dried at 60°C to obtain a modified polyol.

[0054] Preparation of fluorine-modified nanometer-sized silicon carbide chain extender

[0055] 3.15 g of perfluorooctyltrichlorosilane and 1.13 g of decanediamine are mixed and dispersed in 20 mL of toluene, stirred at a speed of 300 rpm for 15 minutes under nitrogen protection, heated to 60°C and reacted for 6 hours, cooled to below 30°C, and the solvent was removed by rotary evaporation to obtain a crude product, which was recrystallized to obtain a modified fluorine-containing silane; 15.72 g of nanometer-sized silicon carbide and the modified fluorine-containing silane prepared above are mixed and dispersed in 50 mL of toluene, 2 mL of deionized water is added, heated to 80°C, and stirred at a speed of 500 rpm for 6 hours, cooled to below 30°C, centrifuged, washed with anhydrous ethanol, and vacuum dried at 60°C to obtain a fluorine-modified nanometer-sized silicon carbide chain extender.

[0056] Preparation of rare earth oxide filler

[0057] The cerium oxide and lanthanum oxide are ground respectively and passed through a 200-mesh sieve to obtain pretreated cerium oxide and lanthanum oxide; 50 g of the rare earth mixture and 10 g of polyaspartic acid are mixed and dispersed into 100 mL of deionized water, heated to 60°C, and stirred at a speed of 500 rpm for 4 h to obtain a preliminary modified suspension; 15 g of polydimethyl diallyl ammonium chloride is dispersed into 30 mL of deionized water to obtain a polyquaternary ammonium salt solution, the preliminary modified suspension is added dropwise into the polyquaternary ammonium salt solution, and the dropping is completed within 1 h, after which the temperature is raised to 80°C for reaction for 4 h, and after cooling to 30°C, centrifugation is performed to obtain a precipitate, which is washed with deionized water and dried at 60°C to obtain a rare earth oxide filler.

[0058] Preparation of wear-resistant coating

[0059] 60 g of silane-modified polyol, 30 g of diphenyl methane diisocyanate, and 15 g of fluorine-modified silicon carbide chain extender are mixed and dispersed into 40 g of solvent, 0.2 g of catalyst is added, the temperature is raised to 80°C, and stirring is performed at a speed of 500 rpm for 3 h to obtain a prepolymer; 20 g of the rare earth oxide filler is added into the prepolymer, stirring is performed at a speed of 1000 rpm for 30 min, 0.8 g of defoaming agent is added, and stirring is performed at a speed of 500 rpm for 15 min to obtain a coating, the coating is passed through a 100-mesh filter screen to obtain a wear-resistant coating.

[0060] Preparation of high-wear-resistant steel structural member

[0061] The steel structural member substrate is degreased and soaked in a 5% mass concentration dilute hydrochloric acid solution for 3 min to obtain an activated steel structural member; an electroplating solution is prepared, the electroplating solution is an aqueous solution, and the electroplating solution includes 300 g / L of nickel sulfate, 200 g / L of chromic anhydride, 50 g / L of sodium sulfate, 30 g / L of boric acid, and 10 g / L of polytetrafluoroethylene particles, and ultrasonic treatment is performed for 30 min to obtain the electroplating solution; the activated steel structural member is used as a cathode, a nickel-chromium alloy is used as an anode, the plating solution is stirred at a speed of 200 rpm, the current density is 4 A / dm2, the electroplating temperature is 60°C, and the electroplating time is 30 min to obtain a steel structural member with a metal plating layer; the wear-resistant coating is coated on the surface of the steel structural member with the metal plating layer, and heating and curing are performed at 100°C for 2 h to obtain a high-wear-resistant steel structural member.

[0062] Example 3

[0063] Preparation of silane-modified polyol

[0064] 5.37 g of cage silsesquioxane and 0.7 g of bisamino silane coupling agent were dispersed in 20 mL of N, N-dimethylformamide, stirred at 200 rpm for 15 min under nitrogen protection, to obtain a silane modified liquid; 0.1 g of dibutyltin dilaurate was added to the silane modified liquid, heated to 80°C, and stirred at 200 rpm for 4 h to obtain a preliminary modification; 93.93 g of polybutylene adipate glycol and 0.5 g of dibutyltin oxide were added to the preliminary modification, stirred at 300 rpm for 15 min under nitrogen protection, heated to 140°C and reacted for 8 h, cooled to below 30°C, and the solvent was removed by distillation under reduced pressure, washed with ethanol, and dried at 60°C under vacuum to obtain a modified polyol.

[0065] Preparation of fluorine modified nanometer silicon carbide chain extender

[0066] 3.41 g of perfluorooctyltrichlorosilane and 1.23 g of decanediamine were mixed and dispersed in 20 mL of toluene, stirred at 300 rpm for 15 min under nitrogen protection, heated to 60°C and reacted for 6 h, cooled to below 30°C, and the solvent was removed by rotary evaporation to obtain a crude product, which was recrystallized to obtain a modified fluorine-containing silane; 15.36 g of nanometer silicon carbide and the modified fluorine-containing silane prepared above were mixed and dispersed in 50 mL of toluene, 2 mL of deionized water was added, heated to 80°C, and stirred at 500 rpm for 6 h, cooled to below 30°C, centrifuged, washed with anhydrous ethanol, and dried at 60°C under vacuum to obtain a fluorine modified nanometer silicon carbide chain extender.

[0067] Preparation of rare earth oxide filler

[0068] Cerium oxide and lanthanum oxide were ground and passed through a 200 mesh sieve to obtain pretreated cerium oxide and lanthanum oxide; the pretreated cerium oxide and lanthanum oxide were mixed in a mass ratio of 1:1 to obtain a rare earth mixture, 50 g of the rare earth mixture and 10 g of polyaspartic acid were mixed and dispersed in 100 mL of deionized water, heated to 60°C, and stirred at 500 rpm for 4 h to obtain a preliminary modified suspension; 15 g of polydimethyl diallyl ammonium chloride was dispersed in 30 mL of deionized water to obtain a polyquaternary ammonium salt solution, the preliminary modified suspension was added dropwise to the polyquaternary ammonium salt solution, and the addition was completed within 1 h, then the temperature was raised to 80°C and reacted for 4 h, cooled to 300°C, centrifuged to obtain a precipitate, washed with deionized water, and dried at 60°C to obtain a rare earth oxide filler.

[0069] Preparation of wear-resistant paint

[0070] Mix and disperse 50 g silane modified polyol, 25 g diphenyl methane diisocyanate and 10 g fluorine modified silicon carbide chain extender into 30 g solvent, add 0.15 g catalyst, heat to 80℃, stir at 500 rpm for 3 h to obtain a prepolymer; add 15 g rare earth oxide filler to the prepolymer, stir at 1000 rpm for 30 min, add 0.6 g defoaming agent, stir at 500 rpm for 15 min to obtain a coating, pass the coating through a 100 mesh filter to obtain a wear-resistant coating.

[0071] Manufacture of high wear-resistant steel structure

[0072] Oil the steel structure substrate, soak in a 5% mass concentration dilute hydrochloric acid solution for 3 min to obtain an activated steel structure; prepare an electroplating solution, the electroplating solution is an aqueous solution, the electroplating solution includes 300 g / L of nickel sulfate, 200 g / L of chromic anhydride, 50 g / L of sodium sulfate, 30 g / L of boric acid, and 10 g / L of polytetrafluoroethylene particles, and ultrasonic for 30 min to obtain the electroplating solution; use the activated steel structure as a cathode, use a nickel-chromium alloy as an anode, stir the plating solution at 200 rpm, the current density is 4 A / dm2, the electroplating temperature is 60℃, and the electroplating time is 30 min to obtain a steel structure with a metal plating layer; coat the wear-resistant coating on the surface of the steel structure with the metal plating layer, and heat and cure at 100℃ for 2 h to obtain a high wear-resistant steel structure.

[0073] Example 4

[0074] Example 4 is based on Example 3, and the difference between Example 4 and Example 3 is only that the amount of cage silsesquioxane in Example 4 is 8.98 g, the amount of bisamino silane coupling agent is 1.17 g, and the amount of polybutylene adipate glycol is 89.85 g.

[0075] Example 5

[0076] Example 5 is based on Example 3, and the difference between Example 5 and Example 3 is only that the amount of cage silsesquioxane in Example 5 is 3.21 g, the amount of bisamino silane coupling agent is 0.42 g, and the amount of polybutylene adipate glycol is 96.37 g.

[0077] Example 6

[0078] Example 6 is based on Example 3, and the difference between Example 6 and Example 3 is only that no bisamino silane coupling agent is added when preparing the silane modified polyol in Example 6.

[0079] Example 7

[0080] Example 7 is based on Example 3, the difference between Example 7 and Example 3 is only that the amount of nano-silicon carbide in Example 7 is 13.76 g, the amount of perfluorooctyltrichlorosilane is 4.59 g, and the amount of decanediamine is 1.65 g.

[0081] Example 8

[0082] Example 8 is based on Example 3, the difference between Example 8 and Example 3 is only that the amount of nano-silicon carbide in Example 8 is 16.3 g, the amount of perfluorooctyltrichlorosilane is 2.72 g, and the amount of decanediamine is 0.98 g.

[0083] Example 9

[0084] Example 9 is based on Example 3, the difference between Example 9 and Example 3 is only that the preparation of the fluorine-modified nano-silicon carbide chain extender does not add decanediamine in Example 9.

[0085] Example 10

[0086] Example 10 is based on Example 3, the difference between Example 10 and Example 3 is only that perfluorooctyltrichlorosilane is replaced by octyltrichlorosilane in Example 10.

[0087] Example 11

[0088] Example 11 is based on Example 3, the difference between Example 11 and Example 3 is only that the preparation of the rare earth oxide filler does not add polyaspartic acid in Example 11.

[0089] Example 12

[0090] Example 12 is based on Example 3, the difference between Example 12 and Example 3 is only that the preparation of the rare earth oxide filler does not add polyquaternary ammonium salt in Example 12.

[0091] Example 13

[0092] Example 13 is based on Example 3, the difference between Example 13 and Example 3 is only that the preparation of the metal coating does not add polytetrafluoroethylene particles in Example 13.

[0093] Comparative Example 1

[0094] Comparative Example 1 is based on Example 3, the difference between Comparative Example 1 and Example 3 is only that the silane-modified polyol is replaced by polybutylene adipate glycol in Comparative Example 1.

[0095] Comparative Example 2

[0096] Comparative Example 2 is based on Example 3, the difference between Comparative Example 2 and Example 3 is only that the fluorine-modified silicon carbide chain extender is replaced by decanediamine in Comparative Example 2.

[0097] Performance test

[0098] (1) Select GB / T 26651-2011 Wear-resistant Steel Castings as the standard, use MMV-1A multifunctional material friction behavior tester to test the wear resistance of the sample, use 5mm diameter counter abrasive material GCr15, under 400g load, counter abrasive speed of 250rpm, counter abrasive for 30min, calculate the wear loss of the sample, prepare three samples for each sample, take the average value after measurement, and record the results in Table 1.

[0099] (2) Corrosion resistance test: in a 10% sodium chloride aqueous solution, the scanning rate is 1mv / s, the scanning detection area of the sample is 1cm3, the corrosion current density is measured, each sample is tested three times, and the average value is taken after measurement, and the results are recorded in Table 1.

[0100] Table 1 Detection results of wear resistance and corrosion resistance of steel structure

[0101] Detection results wear amount (10 -3 g / (N·m))]]> corrosion current density (pA / cm 2 ) Example 1 0.76 0.028 Example 2 0.75 0.026 Example 3 0.73 0.025 Example 4 0.85 0.038 Example 5 0.82 0.033 Example 6 0.91 0.042 Example 7 0.83 0.036 Example 8 0.85 0.039 Example 9 0.98 0.043 Example 10 0.81 0.054 Example 11 0.85 0.045 Example 12 0.87 0.044 Example 13 0.93 0.051 Comparative Example 1 1.06 0.056 Comparative Example 2 1.23 0.068

[0102] As can be seen from Table 1, the wear loss of Examples 1-3 is less than 0.76*10-3g / (N·m), and the corrosion current density is less than 0.028μA / cm2, so it can be seen that the high wear-resistant steel structure prepared by the application has good wear resistance and corrosion resistance.

[0103] As can be seen from Table 1, the difference between Examples 4, 5, 6 and Example 3 is only that: in Example 4, the mass ratio of cage-type silsesquioxane, bisamino silane coupling agent and polybutylene glycol adipate diol is 1:0.13:10, in Example 5, the mass ratio of cage-type silsesquioxane, bisamino silane coupling agent and polybutylene glycol adipate diol is 1:0.13:30, and in Example 6, no bisamino silane coupling agent is added when preparing the silane modified polyol, the wear resistance and corrosion resistance of Examples 4, 5, 6 and Example 3 are decreased; This is because too much cage-type silsesquioxane may agglomerate and become a stress concentration point, forming cracks and falling off during friction, thereby affecting the wear resistance and corrosion resistance; too little cage-type silsesquioxane modification is insufficient, and the performance is decreased; and without adding bisamino silane coupling agent, the reactivity decreases, and the crosslinking degree of the system decreases, thereby affecting the wear resistance and corrosion resistance.

[0104] From Table 1, it can be seen that the difference between Examples 7-10 and Example 3 is only that the mass ratio of nanosilicon carbide, perfluorooctyltrichlorosilane and decanediamine in Example 7 is 3:1:0.36, the mass ratio of nanosilicon carbide, perfluorooctyltrichlorosilane and decanediamine in Example 8 is 6:1:0.36, no decanediamine is added in the preparation of fluorine-modified nanosilicon carbide chain extender in Example 9, and octyltrichlorosilane is used instead of perfluorooctyltrichlorosilane in Example 10. Compared with Example 3, the wear resistance and corrosion resistance of Examples 7-10 are decreased. This is because the mass ratio between nanosilicon carbide and fluorosilane is changed, and too much or too little fluorosilane will affect the modification effect of the chain extender, the stability of the polyurethane molecular chain is decreased, and thus the wear resistance and corrosion resistance are affected. If no decanediamine is added, the fluorosilane can only modify the surface of nanosilicon carbide, but cannot be introduced as a side chain, and thus the crosslinking degree is decreased. If the fluorosilane is replaced by ordinary silane, the introduction of fluorine atoms is lacking, the surface energy of the coating is increased, and the corrosion resistance is deteriorated.

[0105] From Table 1, it can be seen that the difference between Examples 11 and 12 and Example 3 is only that no polyaspartic acid is added in the preparation of rare earth oxide filler in Example 11, and no polyquaternary ammonium salt is added in the preparation of rare earth oxide filler in Example 12. Compared with Example 3, the wear resistance and corrosion resistance of Examples 11 and 12 are decreased. This is because the addition of polyaspartic acid or polyquaternary ammonium salt will affect the stability and synergistic effect of the coating layer, and thus affect the wear resistance of the rare earth oxide and the penetration of the corrosion medium, and thus the wear resistance and corrosion resistance are decreased.

[0106] From Table 1, it can be seen that the difference between Example 13 and Example 3 is only that no polytetrafluoroethylene particles are added in the preparation of metal plating layer in Example 13. Compared with Example 3, the wear resistance and corrosion resistance of Example 13 are decreased. This is because no polytetrafluoroethylene particles are added in the preparation of metal plating layer, the introduction of polytetrafluoroethylene particles is lacking, the surface lubricity is decreased, the frictional resistance is increased, the surface of the plating layer is smoother, the adhesion between the plating layer and the coating layer is decreased, and the corrosion medium is more easily penetrated, and thus the wear resistance and corrosion resistance are decreased.

[0107] From Table 1, it can be seen that the difference between Comparative Example 1 and Example 3 is only that silane-modified polyol is replaced by polybutylene glycol adipate diol in Comparative Example 1. Compared with Example 3, the wear resistance and corrosion resistance of Comparative Example 1 are decreased. This is because the nanocage structure of cage polysiloxane is lacking when silane-modified polyol is replaced by polybutylene glycol adipate diol, the wear resistance is decreased, the crosslinking density of the system is decreased, and thus the corrosion resistance is decreased.

[0108] As can be seen from Table 1, the difference between Comparative Example 2 and Example 3 is that the fluorine-modified silicon carbide chain extender in Comparative Example 2 is replaced by decanediamine. Compared with Example 3, the wear resistance and corrosion resistance of Comparative Example 2 decrease. This is because the reinforcing effect of silicon carbide is lacking, the defects between polyurethane molecules increase, the hardness decreases, the wear resistance deteriorates, the fluorosilane is lacking, the surface energy rises, the corrosion medium is more easily invaded, and the corrosion resistance decreases.

[0109] The embodiments are only explanations of the present application, and are not limitations of the present application. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined by the scope of the claims.

Claims

1. A high abrasion resistant steel structural member characterized by: The high wear-resistant steel structure member comprises a steel structure member base, a metal plating layer and a wear-resistant coating, and the wear-resistant coating is obtained by coating a wear-resistant coating material, and the preparation raw materials of the wear-resistant coating material comprise the following components in mass fraction: silane modified polyol 40-60 parts, diphenyl methane diisocyanate 20-30 parts, fluorine modified nano silicon carbide chain extender 5-15 parts, rare earth oxide filler 10-20 parts, catalyst 0.1-0.2 parts, defoaming agent 0.4-0.8 parts and solvent 20-40 parts. The preparation raw materials of the silane modified polyol comprise cage silsesquioxane, bisamino silane coupling agent and polybutylene adipate diol. The mass ratio of the cage silsesquioxane, bisamino silane coupling agent and polybutylene adipate diol is 1:0.13:(15-20). The preparation raw materials of the fluorine modified nano silicon carbide chain extender comprise nano silicon carbide, perfluorooctyltrichlorosilane and decanediamine. The mass ratio of the nano silicon carbide, perfluorooctyltrichlorosilane and decanediamine is (4-5):1:0.

36. The fluorine modified nano silicon carbide chain extender is prepared by the following steps: mixing and dispersing perfluorooctyltrichlorosilane and decanediamine into toluene, stirring under the protection of neutral gas, heating and reacting, removing the solvent by rotary evaporation after cooling, obtaining a crude product, recrystallizing the crude product to obtain modified fluorine-containing silane, mixing and dispersing nano silicon carbide and the modified fluorine-containing silane prepared above into toluene, adding water, heating and stirring to react, centrifuging, washing and drying after cooling to obtain the fluorine modified nano silicon carbide chain extender.

2. A high abrasion resistant steel structural member according to claim 1, characterized in that: The preparation raw materials of the rare earth oxide filler comprise cerium oxide, lanthanum oxide and a coating polymer.

3. A high abrasion resistant steel structural member according to claim 2, wherein: The preparation raw materials of the coating polymer comprise polyaspartic acid and polyquaternary ammonium salt.

4. A high abrasion resistant steel structural member according to claim 1, wherein: The metal plating layer comprises nickel-chromium alloy and polytetrafluoroethylene particles.

5. A high abrasion resistant steel structural member according to any one of claims 1-4, characterized in that: The high wear-resistant steel structure member is prepared by the following steps: oil removal of the steel structure member base, soaking in dilute hydrochloric acid solution to obtain an activated steel structure member, preparing an electroplating solution, wherein the electroplating solution comprises nickel sulfate, chromic anhydride, sodium sulfate, boric acid and polytetrafluoroethylene particles, and ultrasonic treatment is performed to obtain the electroplating solution, using the activated steel structure member as a cathode and using nickel-chromium alloy as an anode, stirring the plating solution during electroplating to obtain a steel structure member with a metal plating layer, coating the wear-resistant coating material on the surface of the steel structure member with the metal plating layer, and heating and curing to obtain the high wear-resistant steel structure member.