Wear-resistant and anti-skid aluminum profile for passenger boarding car and preparation method thereof

Abstract

The present invention relates to the technical field of aluminum profiles, and specifically to a wear-resistant and anti-skid aluminum profile for passenger boarding vehicles and a preparation method thereof. The present invention comprises the following steps: 1: uniformly mixing polyester polyol, hydroxy acrylic resin, pigment, defoamer, leveling agent, dispersant, wetting agent, ultraviolet absorber and diluent to obtain component A; uniformly mixing aliphatic polyisocyanate curing agent, accelerator and diluent to obtain component B; uniformly mixing aluminum oxide whiskers and modified silicon carbide to obtain component C; 2: uniformly mixing components A, B and C to obtain a wear-resistant and anti-skid coating; and 3: taking an aluminum profile, grinding, polishing, cleaning and drying the surface, coating the surface with primer, curing the surface, and then coating the wear-resistant and anti-skid coating to obtain the wear-resistant and anti-skid aluminum profile for passenger boarding vehicles.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum profiles, in particular to a wear-resistant and anti-skid aluminum profile for passenger boarding vehicles and a preparation method thereof. Background Art

[0002] With the rapid development of the air transportation industry, passenger boarding carts, a crucial means of transport connecting terminals to aircraft, are attracting increasing attention for their safety and comfort. Aluminum extrusions, due to their high specific strength, corrosion resistance, and ease of fabrication, are an ideal choice for boarding cart structures. However, the working platforms and walkways of these carts must exhibit excellent anti-slip properties to prevent slips and equipment displacement.

[0003] Currently, in the aviation industry, anti-slip treatments for areas requiring anti-slip performance are typically applied with anti-slip mats or metal printing. However, both methods have significant disadvantages: anti-slip mats are bulky and unsightly, while metal printing is complex to apply and difficult to maintain. Compared to these two methods, anti-slip coatings offer advantages such as ease of application, aesthetics, significant weight reduction, and simplified maintenance. Anti-slip coatings primarily consist of a film-forming substance, solvent, pigment, filler, and additives. However, unlike conventional coatings, they incorporate wear-resistant particles for an anti-slip effect.

[0004] Therefore, we propose a wear-resistant and non-slip aluminum profile for passenger boarding trolleys and its preparation method, aiming to improve the anti-slip performance by coating the surface of the aluminum profile with an anti-slip coating while maintaining the lightweight and aesthetics of the aluminum profile, thereby effectively improving the safety and user experience of the passenger boarding trolley. Summary of the Invention

[0005] The object of the present invention is to provide a wear-resistant and anti-skid aluminum profile for passenger boarding vehicles and a preparation method thereof, so as to solve the problems raised in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for preparing a wear-resistant and anti-skid aluminum profile for a passenger boarding vehicle comprises the following steps:

[0008] Step 1: Evenly mix polyester polyol, hydroxy acrylic resin, pigment, defoamer, leveling agent, dispersant, wetting agent, ultraviolet absorber and diluent to obtain component A;

[0009] uniformly mixing an aliphatic polyisocyanate curing agent, an accelerator, and a diluent to obtain component B;

[0010] The aluminum oxide whiskers and the modified silicon carbide are uniformly mixed to obtain a C component;

[0011] Step 2: Evenly mix component A, component B and component C to obtain a wear-resistant and anti-slip coating;

[0012] Step 3: Take the aluminum profile, grind, polish, clean and dry the surface, apply primer on the surface, and after curing, apply wear-resistant and anti-skid paint to obtain a wear-resistant and anti-skid aluminum profile for passenger boarding cars.

[0013] Furthermore, the component A is composed of the following raw materials in parts by weight: 10-20 parts of polyester polyol, 30-40 parts of hydroxy acrylic resin, 10-15 parts of pigment, 1-2 parts of defoaming agent, 0.5-1.0 parts of leveling agent, 0.3-0.5 parts of dispersant, 0.1-0.5 parts of wetting agent, 0.1-0.3 parts of ultraviolet absorber, and 30-40 parts of diluent.

[0014] Furthermore, the pigment is one of carbon black, titanium dioxide, iron oxide red, iron oxide yellow, phthalocyanine green and phthalocyanine blue.

[0015] Furthermore, the leveling agent is a mixture of one or more of BYK-3720, BYK-333, and BYK-6410.

[0016] Furthermore, the dispersant is BYK-163.

[0017] Furthermore, the wetting agent is a mixture of one or more of Tego245, Tego277, and Tego4100.

[0018] Furthermore, the ultraviolet agent is a mixture of one or more of benzotriazole mixture UV-1130 and hindered amine UV-123.

[0019] Furthermore, the B component is composed of the following raw materials in parts by weight: 80-90 parts of aliphatic polyisocyanate curing agent, 1-5 parts of accelerator, and 15-25 parts of diluent.

[0020] Furthermore, the mass ratio of aluminum oxide whiskers to modified silicon carbide in the C component is 1:(2-4).

[0021] Furthermore, the preparation method of the modified silicon carbide is as follows:

[0022] Step A: After the silicon carbide is pickled with dilute hydrochloric acid, the pickled nano-silicon carbide and 3-(isomethylacryloyloxy)propyltrimethoxysilane are evenly mixed, ethanol and deionized water are added, and the pH is adjusted to 3-4 with oxalic acid. The mixture is reacted at 70-90° C. for 10-12 hours, and then centrifuged, washed, and dried to obtain double-bond modified silicon carbide;

[0023] Step B: reacting epoxy-terminated silicone oil and methacrylic acid in the presence of a catalyst and a polymerization inhibitor at 100-115°C for 4-6 hours, cooling to room temperature, adding triphenylmethane triisocyanate and dibutyltin dilaurate, and reacting at 70-80°C for 3-5 hours to obtain a double-bond isocyanate-modified silicone oil;

[0024] Step C: Under nitrogen protection, double-bond modified silicon carbide, double-bond isocyanate-modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate and toluene are evenly mixed, azobisisobutyronitrile is added, and the mixture is reacted at 70-80° C. for 10-12 hours. After filtering, washing and drying, modified silicon carbide is obtained.

[0025] Furthermore, in step A, the volume fraction of dilute hydrochloric acid is 5%.

[0026] Furthermore, in step A, the mass ratio of the acid-washed nano-silicon carbide, 3-(isomethacryloyloxy)propyltrimethoxysilane, ethanol and deionized water is 1: (0.4-0.6): (15-20): (3-5).

[0027] Furthermore, in step B, the molar ratio of the epoxy-terminated silicone oil, methacrylic acid and triphenylmethane triisocyanate is 1:(1-2):(1-2).

[0028] Furthermore, the amount of the catalyst used is 0.3-0.5% of the total mass of the epoxy-terminated silicone oil and methacrylic acid.

[0029] Furthermore, the catalyst is one or more of benzyltriethylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium chloride, dodecyltrimethylammonium chloride, tetrabutylammonium bromide, benzyltriethylammonium bromide, and the like.

[0030] Furthermore, the amount of the polymerization inhibitor is 0.1-0.3% of the total mass of the epoxy-terminated silicone oil and methacrylic acid.

[0031] Furthermore, the polymerization inhibitor is one or more of hydroquinone, p-tert-butylcatechol, p-benzoquinone, alkyl p-benzoquinone, catechol, tetrachlorobenzoquinone, etc.

[0032] Furthermore, the amount of dibutyltin dilaurate used is 0.01-0.2% of the total mass of the epoxy-terminated silicone oil and methacrylic acid.

[0033] Furthermore, the mass ratio of the double-bond modified silicon carbide, double-bond isocyanate-modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate and toluene is 1: (1-2): (2-4): (0.5-1.5): (40-50).

[0034] Furthermore, the amount of azobisisobutyronitrile used is 1-3% of the total mass of the double-bond modified silicon carbide, double-bond isocyanate-modified silicone oil, methyl methacrylate and dodecafluoroheptyl methacrylate.

[0035] Furthermore, the mass ratio of component A, component B and component C is (5-7): (4-6): 3.

[0036] Furthermore, the thickness of the primer dry film is 15-25 μm.

[0037] Furthermore, the thickness of the dry film of the wear-resistant and anti-slip coating is 150-250 μm.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention discloses a wear-resistant and anti-skid aluminum profile for passenger boarding vehicles and a preparation method thereof. Silicon carbide particles are pretreated with dilute hydrochloric acid to destroy the surface oxide film and generate silanol groups. The silanol groups can chemically bond with the hydrolyzed silane coupling agent KH570, thereby preliminarily modifying the surface of the silicon carbide particles to obtain double-bond modified silicon carbide, thereby enhancing the interfacial compatibility between the silicon carbide and the polymer matrix. The double-bond modified silicon carbide, double-bond isocyanate-modified silicone oil, methyl methacrylate, and dodecafluoroheptyl methacrylate are then reacted using a free radical polymerization method to obtain modified silicon carbide, thereby achieving synergistic modification of functional groups (isocyanate) and hydrophobic groups (fluorocarbon chains, siloxane segments).

[0040] Among them, the isocyanate group can participate in the polyurethane reaction, further improving the dispersion of silicon carbide in the coating, and avoiding the problems of decreased wear resistance and local peeling caused by filler agglomeration in traditional anti-slip coatings; the extremely low surface energy and hydrophobicity of the fluorocarbon chain are introduced, combined with the siloxane chain segment to form a flexible support skeleton inside the coating, ensuring that the coating has good dynamic hydrophobic stability. The hydrophobic synergistic effect of the fluorocarbon chain and the siloxane chain realizes a "rigid and flexible" coating design at the molecular level, which not only ensures the strength and wear resistance of the coating, but also takes into account the hydrophobic properties, significantly improving the service life of the aluminum profile. DETAILED DESCRIPTION

[0041] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0042] In this embodiment, the aluminum profile is 2024-T3 aluminum plate; the polyester polyol is polycaprolactone polyol, model number is Ingevity 2100A; the hydroxylated acrylic resin is Bayhydrol A 2695 from Covestro; the aliphatic polyisocyanate curing agent is HT-600, purchased from Wanhua Chemical; the accelerator is Dabco T-9, purchased from Evonik; the pigment is carbon black, brand number is Cabot N330; the defoamer is AFCONA-2727; the leveling agent is BYK-3720; the dispersant is BYK-163; the wetting agent is Tego 245; the UV absorber is UV-1130; and the diluent is the polyurethane diluent DreamThinner. 10; Primer: Model HDY-H06-Y010 chromium-free high-solid epoxy primer; Aluminum oxide whisker: Model AM-Al2O3-W-02, purchased from Zhejiang Yamei Nano Technology Co., Ltd.; Silicon carbide: Model 16-800#, purchased from Dongguan Jinying Abrasive Technology Co., Ltd.; Epoxy-terminated silicone oil: Brand Anhui IOTA 105.

[0043] The following parts are by mass unless otherwise specified.

[0044] Example 1: A method for preparing a wear-resistant and anti-skid aluminum profile for a passenger boarding vehicle, comprising the following steps:

[0045] Step 1: Evenly mix 10 parts of polyester polyol, 30 parts of hydroxy acrylic resin, 10 parts of pigment, 1 part of defoamer, 0.5 parts of leveling agent, 0.3 parts of dispersant, 0.1 parts of wetting agent, 0.1 parts of ultraviolet absorber and 30 parts of diluent to obtain component A;

[0046] 80 parts of aliphatic polyisocyanate curing agent, 1 part of accelerator and 15 parts of diluent were mixed to obtain component B;

[0047] Aluminum oxide whiskers and modified silicon carbide are uniformly mixed in a mass ratio of 1:2 to obtain component C;

[0048] Step 2: Evenly mix component A, component B and component C in a mass ratio of 5:4:3 to obtain a wear-resistant and anti-slip coating;

[0049] Step 3: Take the aluminum profile, grind, polish, clean and dry the surface, apply primer on the surface, and after curing, apply wear-resistant and anti-skid paint to obtain a wear-resistant and anti-skid aluminum profile for passenger boarding vehicles;

[0050] The preparation method of modified silicon carbide is as follows:

[0051] Step A: After the silicon carbide is pickled with 5% volume fraction dilute hydrochloric acid, centrifuged, washed, and dried to obtain pickled nano-silicon carbide; the pickled nano-silicon carbide and 3-(isomethylacryloyloxy)propyltrimethoxysilane are evenly mixed, ethanol and deionized water are added, the pH is adjusted to 3 with oxalic acid, and the reaction is carried out at 70° C. for 10 hours. After centrifugation, washing, and drying, double-bond modified silicon carbide is obtained; the mass ratio of the pickled nano-silicon carbide, 3-(isomethylacryloyloxy)propyltrimethoxysilane, ethanol, and deionized water is 1:0.4:15:3;

[0052] Step B: Epoxy-terminated silicone oil and methacrylic acid are reacted in the presence of benzyltriethylammonium chloride and hydroquinone at 100°C for 4 hours, the temperature is lowered to room temperature, triphenylmethane triisocyanate and dibutyltin dilaurate are added, and the reaction is continued at 70°C for 3 hours to obtain a silicone oil modified with double bond isocyanate; the molar ratio of epoxy-terminated silicone oil, methacrylic acid, and triphenylmethane triisocyanate is 1:1:1; the amounts of benzyltriethylammonium chloride, hydroquinone, and dibutyltin dilaurate are 0.3%, 0.1%, and 0.01% of the total mass of the epoxy-terminated silicone oil and methacrylic acid, respectively;

[0053] Step C: Under nitrogen protection, double-bond modified silicon carbide, double-bond isocyanate-modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate and toluene are uniformly mixed in a mass ratio of 1:1:2:0.5:40, and 1% of the total mass of the reaction monomer, azobisisobutyronitrile, is added. The mixture is reacted at 70°C for 10 hours. After filtering, washing and drying, modified silicon carbide is obtained.

[0054] Example 2: A method for preparing a wear-resistant and anti-skid aluminum profile for a passenger boarding vehicle, comprising the following steps:

[0055] Step 1: Mix 15 parts of polyester polyol, 35 parts of hydroxy acrylic resin, 12 parts of pigment, 1.5 parts of defoamer, 0.8 parts of leveling agent, 0.2 parts of dispersant, 0.3 parts of wetting agent, 0.2 parts of ultraviolet absorber and 25 parts of diluent to obtain component A;

[0056] 85 parts of aliphatic polyisocyanate curing agent, 3 parts of accelerator and 20 parts of diluent were mixed to obtain component B;

[0057] Aluminum oxide whiskers and modified silicon carbide are uniformly mixed in a mass ratio of 1:3 to obtain component C;

[0058] Step 2: Evenly mix component A, component B and component C in a mass ratio of 6:5:3 to obtain a wear-resistant and anti-skid coating;

[0059] Step 3: Take the aluminum profile, grind, polish, clean and dry the surface, apply primer on the surface, and after curing, apply wear-resistant and anti-skid paint to obtain a wear-resistant and anti-skid aluminum profile for passenger boarding vehicles;

[0060] The preparation method of modified silicon carbide is as follows:

[0061] Step A: After the silicon carbide is pickled with 5% volume fraction dilute hydrochloric acid, centrifuged, washed, and dried to obtain pickled nano-silicon carbide; the pickled nano-silicon carbide and 3-(isomethylacryloyloxy)propyltrimethoxysilane are evenly mixed, ethanol and deionized water are added, the pH is adjusted to 3.5 with oxalic acid, and the reaction is carried out at 80° C. for 11 hours. After centrifugation, washing, and drying, double-bond modified silicon carbide is obtained; the mass ratio of the pickled nano-silicon carbide, 3-(isomethylacryloyloxy)propyltrimethoxysilane, ethanol, and deionized water is 1:0.5:18:4;

[0062] Step B: Epoxy-terminated silicone oil and methacrylic acid are reacted in the presence of benzyltriethylammonium chloride and hydroquinone at 110°C for 5 hours, the temperature is lowered to room temperature, triphenylmethane triisocyanate and dibutyltin dilaurate are added, and the reaction is continued at 75°C for 4 hours to obtain a silicone oil modified with double bond isocyanate; the molar ratio of epoxy-terminated silicone oil, methacrylic acid, and triphenylmethane triisocyanate is 1:1.5:1.5; the amounts of benzyltriethylammonium chloride, hydroquinone, and dibutyltin dilaurate are 0.4%, 0.2%, and 0.1% of the total mass of epoxy-terminated silicone oil and methacrylic acid, respectively;

[0063] Step C: Under nitrogen protection, double-bond modified silicon carbide, double-bond isocyanate-modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate and toluene are uniformly mixed in a mass ratio of 1:1.5:3:1:45, and 2% of the total mass of the reaction monomer, azobisisobutyronitrile, is added. The mixture is reacted at 75°C for 11 hours. After filtering, washing and drying, modified silicon carbide is obtained.

[0064] Example 3: A method for preparing a wear-resistant and anti-skid aluminum profile for a passenger boarding vehicle, comprising the following steps:

[0065] Step 1: uniformly mix 20 parts of polyester polyol, 40 parts of hydroxy acrylic resin, 15 parts of pigment, 2 parts of defoaming agent, 1.0 part of leveling agent, 0.3 parts of dispersant, 0.5 parts of wetting agent, 0.3 parts of ultraviolet absorber and 30 parts of diluent to obtain component A;

[0066] Mix 90 parts of aliphatic polyisocyanate curing agent, 5 parts of accelerator and 25 parts of diluent to obtain component B;

[0067] Aluminum oxide whiskers and modified silicon carbide are uniformly mixed in a mass ratio of 1:4 to obtain component C;

[0068] Step 2: Evenly mix component A, component B and component C in a mass ratio of 7:6:3 to obtain a wear-resistant and anti-skid coating;

[0069] Step 3: Take the aluminum profile, grind, polish, clean and dry the surface, apply primer on the surface, and after curing, apply wear-resistant and anti-skid paint to obtain a wear-resistant and anti-skid aluminum profile for passenger boarding vehicles;

[0070] The preparation method of modified silicon carbide is as follows:

[0071] Step A: After the silicon carbide is pickled with 5% volume fraction dilute hydrochloric acid, centrifuged, washed, and dried to obtain pickled nano-silicon carbide; the pickled nano-silicon carbide and 3-(isomethylacryloyloxy)propyltrimethoxysilane are evenly mixed, ethanol and deionized water are added, the pH is adjusted to 4 with oxalic acid, and the mixture is reacted at 90° C. for 12 hours. After centrifugation, washing, and drying, double-bond modified silicon carbide is obtained; the mass ratio of the pickled nano-silicon carbide, 3-(isomethylacryloyloxy)propyltrimethoxysilane, ethanol, and deionized water is 1:0.6:20:5;

[0072] Step B: Epoxy-terminated silicone oil and methacrylic acid are reacted in the presence of benzyltriethylammonium chloride and hydroquinone at 115°C for 6 hours, the temperature is cooled to room temperature, triphenylmethane triisocyanate and dibutyltin dilaurate are added, and the reaction is continued at 80°C for 5 hours to obtain a silicone oil modified with double bond isocyanate; the molar ratio of epoxy-terminated silicone oil, methacrylic acid, and triphenylmethane triisocyanate is 1:2:2; the amounts of benzyltriethylammonium chloride, hydroquinone, and dibutyltin dilaurate are 0.4%, 0.2%, and 0.1% of the total mass of epoxy-terminated silicone oil and methacrylic acid, respectively;

[0073] Step C: Under nitrogen protection, double-bond modified silicon carbide, double-bond isocyanate-modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate and toluene are evenly mixed in a ratio of 1:2:4:1.5:50, and 3% of the total weight of the reaction monomers, azobisisobutyronitrile, are added. The mixture is reacted at 80°C for 12 hours. After filtering, washing and drying, modified silicon carbide is obtained.

[0074] Comparative Example 1: A method for preparing a wear-resistant and non-slip aluminum profile for a passenger boarding vehicle, comprising the following processes:

[0075] Compared with Example 2, the modified silicon carbide in Comparative Example 1 is replaced with silicon carbide of the same mass, and the other steps are the same as those in Example 2.

[0076] Comparative Example 2: A method for preparing a wear-resistant and anti-skid aluminum profile for a passenger boarding vehicle, comprising the following processes:

[0077] Compared with Example 2, Comparative Example 2 does not introduce double-bond isocyanate-modified silicone oil, and other steps are the same as Example 2.

[0078] Comparative Example 3: A method for preparing a wear-resistant and non-slip aluminum profile for a passenger boarding vehicle, comprising the following processes:

[0079] Compared with Example 2, Comparative Example 3 does not introduce dodecafluoroheptyl methacrylate, and other steps are the same as Example 2.

[0080] Comparative Example 4: A method for preparing a wear-resistant and non-slip aluminum profile for a passenger boarding vehicle, comprising the following processes:

[0081] The preparation method of modified silicon carbide is as follows:

[0082] Step A: After the silicon carbide is pickled with 5% volume fraction dilute hydrochloric acid, centrifuged, washed, and dried to obtain pickled nano-silicon carbide; the pickled nano-silicon carbide and 3-(isomethylacryloyloxy)propyltrimethoxysilane are evenly mixed, ethanol and deionized water are added, the pH is adjusted to 3.5 with oxalic acid, and the reaction is carried out at 80° C. for 11 hours. After centrifugation, washing, and drying, double-bond modified silicon carbide is obtained; the mass ratio of the pickled nano-silicon carbide, 3-(isomethylacryloyloxy)propyltrimethoxysilane, ethanol, and deionized water is 1:0.5:18:4;

[0083] Step B: Epoxy-terminated silicone oil and methacrylic acid are reacted in the presence of benzyltriethylammonium chloride and hydroquinone at 110°C for 5 hours, then cooled to room temperature, triphenylmethane triisocyanate and dibutyltin dilaurate are added, and the reaction is continued at 75°C for 4 hours to obtain a silicone oil modified with double bond isocyanate; the molar ratio of epoxy-terminated silicone oil, methacrylic acid, and triphenylmethane triisocyanate is 1:1.5:0.5; the amounts of benzyltriethylammonium chloride, hydroquinone, and dibutyltin dilaurate are 0.4%, 0.2%, and 0.1% of the total mass of epoxy-terminated silicone oil and methacrylic acid, respectively;

[0084] Step C: Under nitrogen protection, double-bond modified silicon carbide, double-bond isocyanate-modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate, and toluene are uniformly mixed in a mass ratio of 1:1.5:3:1:45, and 2% of the total mass of the reaction monomer, azobisisobutyronitrile, is added, and the mixture is reacted at 75°C for 11 hours. After filtering, washing, and drying, modified silicon carbide is obtained;

[0085] Compared with Example 2, in step B of Comparative Example 4, the molar ratio of the epoxy-terminated silicone oil, methacrylic acid and triphenylmethane triisocyanate is 1:1.5:0.5, and the other steps are the same as in Example 2.

[0086] Detection experiment:

[0087] Experiment 1: The wear-resistant and non-slip aluminum profiles for passenger boarding vehicles obtained in Examples 1-3 and Comparative Examples 1-4 were used to prepare samples. The maximum static friction coefficient between the wear-resistant and non-slip coating and the rubber surface in dry and wet states was tested using a friction coefficient tester in accordance with CB / T 10006-2021.

[0088] Experiment 2: Samples were prepared from the wear-resistant and non-slip aluminum profiles for passenger boarding vehicles obtained in Examples 1-3 and Comparative Examples 1-4. The wear resistance of the coating was measured using an abrasion tester in accordance with ASTM D4060-19. A CS-10 rubber grinding wheel with a mass of 1000g was used. The wear resistance was measured by the mass loss of the paint film after a friction cycle of 500r.

[0089] Experiment 3: The wear-resistant and non-slip aluminum profiles for passenger boarding vehicles obtained in Examples 1-3 and Comparative Examples 1-4 were used to prepare samples, and the water contact angle was measured using a contact angle meter. The volume of deionized water was 2 μL.

[0090] Test results

[0091]

[0092] According to the data in the above table, we can clearly draw the following conclusions:

[0093] The data of Examples 1-3 show that the wear-resistant and anti-skid coating prepared by the present invention can significantly improve the wear resistance and anti-skid performance of aluminum profiles, while taking into account the hydrophobic performance, significantly extending its service life. The data of Example 2 and Comparative Example 1 show that the wear resistance, anti-skid performance and hydrophobicity of Comparative Example 1, which does not use the modified silicon carbide prepared by the present invention, are significantly reduced; the data of Example 2 and Comparative Example 2 show that Example 2 achieves the hydrophobic synergy between the siloxane chain and the fluorocarbon chain by adding a silicone oil modified with a double-bond isocyanate; the data of Example 2 and Comparative Example 3 show that the hydrophobic performance of Comparative Example 3 is reduced by not adding dodecafluoroheptyl methacrylate; the data of Example 2 and Comparative Example 4 show that reducing the amount of triphenylmethane triisocyanate added will lead to a decrease in the compatibility of silicon carbide. The performance of the modified silicon carbide prepared by the present invention is affected by the ratio of each reagent in its preparation process. Selecting the ratio within the range, the prepared material has excellent comprehensive performance.

[0094] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A method for preparing a wear-resistant and non-slip aluminum profile for passenger boarding vehicles, characterized in that: The steps include: Step 1: Evenly mix polyester polyol, hydroxy acrylic resin, pigment, defoamer, leveling agent, dispersant, wetting agent, ultraviolet absorber and diluent to obtain component A; Mixing the aliphatic polyisocyanate curing agent, accelerator and diluent to obtain component B; The aluminum oxide whiskers and the modified silicon carbide are uniformly mixed to obtain a C component; Step 2: Evenly mix component A, component B and component C to obtain a wear-resistant and anti-slip coating; Step 3: Take the aluminum profile, grind, polish, clean and dry the surface, apply primer on the surface, and after curing, apply wear-resistant and anti-skid paint to obtain a wear-resistant and anti-skid aluminum profile for passenger boarding vehicles; The preparation method of the modified silicon carbide is as follows: Step A: After the silicon carbide is pickled with dilute hydrochloric acid, the pickled nano-silicon carbide and 3-(isomethylacryloyloxy)propyltrimethoxysilane are evenly mixed, ethanol and deionized water are added, and the pH is adjusted to 3-4 with oxalic acid. The mixture is reacted at 70-90° C. for 10-12 hours, and then centrifuged, washed, and dried to obtain double-bond modified silicon carbide; Step B: reacting epoxy-terminated silicone oil and methacrylic acid in the presence of a catalyst and a polymerization inhibitor at 100-115°C for 4-6 hours, cooling to room temperature, adding triphenylmethane triisocyanate and dibutyltin dilaurate, and reacting at 70-80°C for 3-5 hours to obtain a double-bond isocyanate-modified silicone oil; Step C: Under nitrogen protection, double-bond modified silicon carbide, double-bond isocyanate-modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate and toluene are uniformly mixed, azobisisobutyronitrile is added, and the mixture is reacted at 70-80° C. for 10-12 hours. After filtering, washing and drying, modified silicon carbide is obtained; In the step C, the mass ratio of double-bond modified silicon carbide, double-bond isocyanate-modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate and toluene is 1: (1-2): (2-4): (0.5-1.5): (40-50).

2. The method for preparing a wear-resistant and non-slip aluminum profile for a passenger boarding vehicle according to claim 1, characterized in that: The component A is composed of the following raw materials in parts by weight: 10-20 parts of polyester polyol, 30-40 parts of hydroxy acrylic resin, 10-15 parts of pigment, 1-2 parts of defoaming agent, 0.5-1.0 parts of leveling agent, 0.3-0.5 parts of dispersant, 0.1-0.5 parts of wetting agent, 0.1-0.3 parts of ultraviolet absorber, and 30-40 parts of diluent.

3. The method for preparing the wear-resistant and non-slip aluminum profile for passenger boarding vehicles according to claim 1, characterized in that: The B component is composed of the following raw materials in parts by weight: 80-90 parts of aliphatic polyisocyanate curing agent, 1-5 parts of accelerator, and 15-25 parts of diluent.

4. The method for preparing a wear-resistant and non-slip aluminum profile for a passenger boarding vehicle according to claim 1, characterized in that: The mass ratio of aluminum oxide whiskers to modified silicon carbide in the C component is 1:(2-4).

5. The method for preparing a wear-resistant and non-slip aluminum profile for a passenger boarding vehicle according to claim 1, characterized in that: In the step A, the mass ratio of the acid-washed nano-silicon carbide, 3-(isomethacryloyloxy)propyltrimethoxysilane, ethanol and deionized water is 1: (0.4-0.6): (15-20): (3-5).

6. The method for preparing a wear-resistant and non-slip aluminum profile for a passenger boarding vehicle according to claim 1, characterized in that: In the step B, the molar ratio of the epoxy-terminated silicone oil, methacrylic acid and triphenylmethane triisocyanate is 1:(1-2):(1-2).

7. The method for preparing a wear-resistant and non-slip aluminum profile for a passenger boarding vehicle according to claim 1, characterized in that: The mass ratio of component A, component B and component C is (5-7): (4-6):

3.

8. A wear-resistant and non-slip aluminum profile for passenger boarding vehicles prepared according to the preparation method according to any one of claims 1 to 7.

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