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

Abstract

The invention relates to the technical field of aluminum profiles, in particular to a wear-resistant anti-skid aluminum profile for a passenger boarding car and a preparation method of the wear-resistant anti-skid aluminum profile. The preparation method comprises the following steps: step 1, uniformly mixing polyester polyol, hydroxy acrylic resin, pigment, a defoaming agent, a flatting agent, a dispersing agent, a wetting agent, an ultraviolet light absorber and a diluent to obtain a component A; uniformly mixing an aliphatic polyisocyanate curing agent, an accelerant and a diluent to obtain a component B; uniformly mixing aluminum oxide whiskers and modified silicon carbide to obtain a component C; and 2, uniformly mixing the component A, the component B and the component C to obtain the wear-resistant anti-skid coating, and thirdly, the aluminum profile is taken, the surface of the aluminum profile is ground, polished, cleaned and dried, the surface of the aluminum profile is coated with primer, the primer is cured, then the wear-resistant and anti-skid coating is coated, and the wear-resistant and anti-skid aluminum profile for the passenger boarding car is obtained.

Description

Technical Field

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

[0002] With the rapid development of the air transportation industry, as an important means of transportation connecting the terminal building and the aircraft, the safety and comfort of passenger boarding vehicles have received increasing attention. Due to its high specific strength, corrosion resistance and easy processability, aluminum profiles have become an ideal choice for the structure of boarding vehicles. However, the surfaces of the working platforms and passages of boarding vehicles need to have excellent anti-slip performance to prevent personnel from slipping or equipment from shifting.

[0003] Currently, in the aviation field, for parts with anti-slip requirements, the common practice is to use anti-slip pads or metal printing for treatment, and both of these two methods have obvious disadvantages: anti-slip pads have a large weight gain and are not aesthetically pleasing, and the construction process of metal printing is complex and not easy to maintain. Compared with these two process methods, using anti-slip coatings has the advantages of easy construction, beauty, obvious weight reduction, and simple later maintenance. Anti-slip coatings are mainly composed of film-forming substances, solvents, pigments, fillers and additives, but different from general coatings, wear-resistant particles that play an anti-slip role are added.

[0004] Therefore, we propose a wear-resistant and anti-slip aluminum profile for passenger boarding vehicles and a preparation method thereof, aiming to improve its anti-slip performance by coating an anti-slip coating on the surface of the aluminum profile, while maintaining the light weight and beauty of the aluminum material, thereby effectively improving the safety and use experience of passenger boarding vehicles. Summary of the Invention

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

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A preparation method of a wear-resistant and anti-slip aluminum profile for passenger boarding vehicles includes the following steps: Step 1: Mix polyester polyol, hydroxyl acrylic resin, pigment, defoamer, leveling agent, dispersant, wetting agent, ultraviolet absorber and diluent evenly to obtain Component A; Mix aliphatic polyisocyanate curing agent, accelerator and diluent evenly to obtain Component B; Mix aluminum oxide whiskers and modified silicon carbide evenly to obtain Component C; Step 2: Mix Component A, Component B and Component C evenly to obtain a wear-resistant and anti-slip coating; Step 3: Take the aluminum profile. After surface grinding, polishing, cleaning, and drying, apply a primer on its surface. After curing, apply an abrasion-resistant and anti-slip coating to obtain an abrasion-resistant and anti-slip aluminum profile for passenger boarding vehicles.

[0007] Further, the component A is composed of the following raw materials in parts by weight: 10 - 20 parts of polyester polyol, 30 - 40 parts of hydroxyl acrylic resin, 10 - 15 parts of pigment, 1 - 2 parts of defoamer, 0.5 - 1.0 part of leveling agent, 0.3 - 0.5 part of dispersant, 0.1 - 0.5 part of wetting agent, 0.1 - 0.3 part of ultraviolet absorber, and 30 - 40 parts of diluent.

[0008] Further, the pigment is one of carbon black, titanium dioxide, iron oxide red, iron oxide yellow, phthalocyanine green, and phthalocyanine blue.

[0009] Further, the leveling agent is one or a mixture of BYK - 3720, BYK - 333, and BYK - 6410.

[0010] Further, the dispersant is BYK - 163.

[0011] Further, the wetting agent is one or a mixture of Tego245, Tego277, and Tego4100.

[0012] Further, the ultraviolet agent is one or a mixture of benzotriazole mixture UV - 1130 and hindered amine type UV - 123.

[0013] Further, the component B 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.

[0014] Further, the mass ratio of aluminum oxide whiskers to modified silicon carbide in the component C is 1:(2 - 4).

[0015] Further, the preparation method of the modified silicon carbide is as follows: Step A: After pickling silicon carbide with dilute hydrochloric acid, mix the pickled nano - silicon carbide and 3 - (methacryloyloxy)propyltrimethoxysilane evenly, add ethanol and deionized water, adjust the pH to 3 - 4 with oxalic acid, react at 70 - 90°C for 10 - 12 h, and after centrifugation, washing, and drying, obtain double - bond modified silicon carbide; Step B: React epoxy - terminated silicone oil and methacrylic acid under the action of a catalyst and an inhibitor at 100 - 115°C for 4 - 6 h, cool to room temperature, add triphenylmethane triisocyanate and dibutyltin dilaurate, and react at 70 - 80°C for 3 - 5 h to obtain double - bond isocyanate - modified silicone oil; Step C: Under nitrogen protection, mix double-bond modified silicon carbide, double-bond-containing isocyanate modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate and toluene evenly, add azobisisobutyronitrile, and react at 70 - 80 °C for 10 - 12 h. After filtration, washing and drying, modified silicon carbide is obtained.

[0016] Further, in the step A, the volume fraction of the dilute hydrochloric acid is 5%.

[0017] Further, in the step A, the mass ratio of the pickled nano silicon carbide, 3-(methacryloyloxy)propyltrimethoxysilane, ethanol and deionized water is 1:(0.4 - 0.6):(15 - 20):(3 - 5).

[0018] Further, in the step B, the molar ratio of the terminal epoxy group silicone oil, methacrylic acid and triphenylmethane triisocyanate is 1:(1 - 2):(1 - 2).

[0019] Further, the dosage of the catalyst is 0.3 - 0.5% of the total mass of the terminal epoxy group silicone oil and methacrylic acid.

[0020] Further, the catalyst is one or more of benzyltriethylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium chloride, dodecyltrimethylammonium chloride, tetrabutylammonium bromide, benzyltriethylammonium bromide, etc.

[0021] Further, the dosage of the polymerization inhibitor is 0.1 - 0.3% of the total mass of the terminal epoxy group silicone oil and methacrylic acid.

[0022] Further, the polymerization inhibitor is one or more of hydroquinone, p-tert-butylcatechol, p-benzoquinone, alkyl p-benzoquinone, catechol, tetrachlorobenzoquinone, etc.

[0023] Further, the dosage of the dibutyltin dilaurate is 0.01 - 0.2% of the total mass of the terminal epoxy group silicone oil and methacrylic acid.

[0024] Further, the mass ratio of the double-bond modified silicon carbide, double-bond-containing isocyanate modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate and toluene is 1:(1 - 2):(2 - 4):(0.5 - 1.5):(40 - 50).

[0025] Further, the dosage of the azobisisobutyronitrile is 1 - 3% of the total mass of the double-bond modified silicon carbide, double-bond-containing isocyanate modified silicone oil, methyl methacrylate and dodecafluoroheptyl methacrylate.

[0026] Further, the mass ratio of the component A, component B and component C is (5 - 7):(4 - 6):3.

[0027] Furthermore, the dry film thickness of the primer is 15 - 25 μm.

[0028] Furthermore, the dry film thickness of the wear-resistant and anti-slip coating is 150 - 250 μm.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: For a wear-resistant and anti-slip aluminum profile for passenger boarding vehicles and its preparation method of the present invention, silicon carbide particles are pretreated with dilute hydrochloric acid to break the surface oxide film and generate silanols. The silanols can undergo chemical bonding with the hydrolyzed silane coupling agent KH570, so that the surface of the silicon carbide particles is preliminarily modified to obtain double-bond modified silicon carbide, enhancing the interfacial compatibility between the silicon carbide and the polymer matrix; then, by using the method of free radical polymerization, the double-bond modified silicon carbide, double-bond-containing isocyanate modified silicone oil, methyl methacrylate, and dodecafluorooctyl methacrylate are reacted to obtain modified silicon carbide, realizing the synergistic modification of functional groups (isocyanate groups) and hydrophobic groups (fluorocarbon chains, siloxane segments).

[0030] Among them, the isocyanate groups 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; introducing the extremely low surface energy and hydrophobicity of the fluorocarbon chain, combined with the siloxane segments to form a flexible support framework 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 the "rigid-flexible combination" coating design at the molecular level, not only ensuring the strength and wear resistance of the coating, but also taking into account the hydrophobic performance, significantly improving the service life of the aluminum profile. Specific Embodiments

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0032] In this embodiment, the aluminum profile is 2024 - T3 aluminum plate; the polyester polyol is polycaprolactone polyol, with the model of Yingjwite 2100A; the hydroxyl acrylic resin is Covestro Bayhydrol A 2695; 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, with the brand of Cabot N330; the defoamer is AFCONA - 2727; the leveling agent is BYK - 3720; the dispersant is BYK - 163; the wetting agent is Degussa Tego245; the ultraviolet absorber is UV - 1130; the diluent is polyurethane diluent DreamThinner 10; the primer is a chromium - free high - solid epoxy primer with the model of HDY - H06 - Y010; the aluminum oxide whiskers are of the model AM - Al2O3 - W - 02, purchased from Zhejiang Asia - America Nano Technology Co., Ltd.; the silicon carbide is of the model 16 - 800#, purchased from Dongguan Jinying Abrasive Technology Co., Ltd.; the terminal epoxy - group silicone oil has the brand of Anhui Aiyota IOTA 105.

[0033] Unless otherwise specified, the following parts are by mass.

[0034] Example 1: A preparation method of wear - resistant and anti - slip aluminum profiles for passenger boarding vehicles, comprising the following processes: Step 1: Mix 10 parts of polyester polyol, 30 parts of hydroxyl acrylic resin, 10 parts of pigment, 1 part of defoamer, 0.5 part of leveling agent, 0.3 part of dispersant, 0.1 part of wetting agent, 0.1 part of ultraviolet absorber and 30 parts of diluent evenly to obtain Component A; Mix 80 parts of aliphatic polyisocyanate curing agent, 1 part of accelerator and 15 parts of diluent evenly to obtain Component B; Mix aluminum oxide whiskers and modified silicon carbide evenly at a mass ratio of 1:2 to obtain Component C; Step 2: Mix Component A, Component B and Component C evenly at a mass ratio of 5:4:3 to obtain the wear - resistant and anti - slip coating; Step 3: Take the aluminum profile, polish, clean and dry its surface, then coat the primer on its surface. After curing, coat the wear - resistant and anti - slip coating to obtain the wear - resistant and anti - slip aluminum profile for passenger boarding vehicles; The preparation method of the modified silicon carbide is as follows: Step A: The silicon carbide is pickled with dilute hydrochloric acid with a volume fraction of 5%, centrifuged, washed, and dried to obtain pickled nano-silicon carbide; the pickled nano-silicon carbide and 3-(methacryloyloxy)propyltrimethoxysilane are mixed evenly, 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 h. After centrifugation, washing, and drying, double-bond modified silicon carbide is obtained; the mass ratio of pickled nano-silicon carbide, 3-(methacryloyloxy)propyltrimethoxysilane, ethanol, and deionized water is 1:0.4:15:3; Step B: Terminal epoxy group silicone oil and methacrylic acid react at 100 °C for 4 h under the action of benzyltriethylammonium chloride and hydroquinone, cooled to room temperature, triphenylmethane triisocyanate and dibutyltin dilaurate are added, and the reaction is carried out at 70 °C for 3 h to obtain double-bond isocyanate modified silicone oil; the molar ratio of terminal epoxy group silicone oil, methacrylic acid, and triphenylmethane triisocyanate is 1:1:1; the dosages of benzyltriethylammonium chloride, hydroquinone, and dibutyltin dilaurate are 0.3%, 0.1%, and 0.01% of the total mass of terminal epoxy group silicone oil and methacrylic acid respectively; Step C: Under nitrogen protection, double-bond modified silicon carbide, double-bond isocyanate modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate, and toluene are mixed evenly according to a mass ratio of 1:1:2:0.5:40, 1% of azobisisobutyronitrile based on the total mass of the reaction monomers is added, and the reaction is carried out at 70 °C for 10 h. After filtration, washing, and drying, modified silicon carbide is obtained.

[0035] Example 2: A preparation method of wear-resistant and anti-slip aluminum profiles for passenger boarding vehicles, including the following processes: Step 1: 15 parts of polyester polyol, 35 parts of hydroxyacrylic resin, 12 parts of pigment, 1.5 parts of defoamer, 0.8 part of leveling agent, 0.2 part of dispersant, 0.3 part of wetting agent, 0.2 part of ultraviolet absorber, and 25 parts of diluent are mixed evenly to obtain component A; 85 parts of aliphatic polyisocyanate curing agent, 3 parts of accelerator, and 20 parts of diluent are mixed evenly to obtain component B; Aluminum oxide whiskers and modified silicon carbide are mixed evenly according to a mass ratio of 1:3 to obtain component C; Step 2: Component A, component B, and component C are mixed evenly according to a mass ratio of 6:5:3 to obtain a wear-resistant and anti-slip coating; Step 3: Take the aluminum profile, after surface grinding, polishing, cleaning, and drying, apply a primer on its surface, and after curing, apply the wear-resistant and anti-slip coating to obtain the wear-resistant and anti-slip aluminum profile for passenger boarding vehicles; The preparation method of the modified silicon carbide is as follows: Step A: The silicon carbide is pickled with dilute hydrochloric acid with a volume fraction of 5%, centrifuged, washed, and dried to obtain pickled nano-silicon carbide; the pickled nano-silicon carbide and 3-(methacryloyloxy)propyltrimethoxysilane are mixed evenly, ethanol and deionized water are added, and the pH is adjusted to 3.5 with oxalic acid, and the reaction is carried out at 80 °C for 11 h. After centrifugation, washing, and drying, double-bond modified silicon carbide is obtained; the mass ratio of pickled nano-silicon carbide, 3-(methacryloyloxy)propyltrimethoxysilane, ethanol, and deionized water is 1:0.5:18:4; Step B: Terminal epoxy group silicone oil and methacrylic acid react at 110 °C for 5 h under the action of benzyltriethylammonium chloride and hydroquinone, and the temperature is lowered to room temperature. Triphenylmethane triisocyanate and dibutyltin dilaurate are added, and the reaction is carried out at 75 °C for 4 h to obtain double-bond isocyanate modified silicone oil; the molar ratio of terminal epoxy group silicone oil, methacrylic acid, and triphenylmethane triisocyanate is 1:1.5:1.5; the dosages of benzyltriethylammonium chloride, hydroquinone, and dibutyltin dilaurate are 0.4%, 0.2%, and 0.1% of the total mass of terminal epoxy group silicone oil and methacrylic acid respectively; Step C: Under nitrogen protection, double-bond modified silicon carbide, double-bond isocyanate modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate, and toluene are mixed evenly according to the mass ratio of 1:1.5:3:1:45, 2% of azobisisobutyronitrile based on the total mass of the reaction monomers is added, and the reaction is carried out at 75 °C for 11 h. After filtration, washing, and drying, modified silicon carbide is obtained.

[0036] Example 3: A preparation method of wear-resistant and anti-slip aluminum profiles for passenger boarding vehicles includes the following processes: Step 1: 20 parts of polyester polyol, 40 parts of hydroxyacrylic resin, 15 parts of pigment, 2 parts of defoamer, 1.0 part of leveling agent, 0.3 part of dispersant, 0.5 part of wetting agent, 0.3 part of ultraviolet absorber, and 30 parts of diluent are mixed evenly to obtain component A; 90 parts of aliphatic polyisocyanate curing agent, 5 parts of accelerator, and 25 parts of diluent are mixed evenly to obtain component B; Aluminum oxide whiskers and modified silicon carbide are mixed evenly according to the mass ratio of 1:4 to obtain component C; Step 2: Component A, component B, and component C are mixed evenly according to the mass ratio of 7:6:3 to obtain wear-resistant and anti-slip coating; Step 3: Take the aluminum profile, polish, clean, and dry its surface, apply a primer on its surface, and after curing, apply the wear-resistant and anti-slip coating to obtain wear-resistant and anti-slip aluminum profiles for passenger boarding vehicles; The preparation method of the modified silicon carbide is as follows: Step A: After pickling silicon carbide with dilute hydrochloric acid with a volume fraction of 5%, centrifuge, wash, and dry to obtain pickled nano-silicon carbide; mix the pickled nano-silicon carbide and 3-(methacryloyloxy)propyltrimethoxysilane evenly, add ethanol and deionized water, adjust the pH to 4 with oxalic acid, react at 90 °C for 12 h, and after centrifugation, washing, and drying, obtain double-bond modified silicon carbide; the mass ratio of pickled nano-silicon carbide, 3-(methacryloyloxy)propyltrimethoxysilane, ethanol, and deionized water is 1:0.6:20:5; Step B: Under the action of benzyltriethylammonium chloride and hydroquinone, react terminal epoxy group silicone oil and methacrylic acid at 115 °C for 6 h, cool to room temperature, add triphenylmethane triisocyanate and dibutyltin dilaurate, and react at 80 °C for 5 h to obtain double-bond isocyanate modified silicone oil; the molar ratio of terminal epoxy group silicone oil, methacrylic acid, and triphenylmethane triisocyanate is 1:2:2; the dosages of benzyltriethylammonium chloride, hydroquinone, and dibutyltin dilaurate are 0.4%, 0.2%, and 0.1% of the total mass of terminal epoxy group silicone oil and methacrylic acid respectively; Step C: Under nitrogen protection, mix double-bond modified silicon carbide, double-bond isocyanate modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate, and toluene in a ratio of 1:2:4:1.5:50 evenly, add azobisisobutyronitrile accounting for 3% of the total mass of the reaction monomers, react at 80 °C for 12 h, and after filtration, washing, and drying, obtain modified silicon carbide.

[0037] Comparative Example 1: A preparation method of wear-resistant and anti-slip aluminum profiles for passenger boarding locomotives includes the following processes: Compared with Example 2, in Comparative Example 1, the modified silicon carbide is replaced with silicon carbide of the same mass, and other steps are the same as those in Example 2.

[0038] Comparative Example 2: A preparation method of wear-resistant and anti-slip aluminum profiles for passenger boarding locomotives includes the following processes: Compared with Example 2, in Comparative Example 2, the double-bond isocyanate modified silicone oil is not introduced, and other steps are the same as those in Example 2.

[0039] Comparative Example 3: A preparation method of wear-resistant and anti-slip aluminum profiles for passenger boarding locomotives includes the following processes: Compared with Example 2, in Comparative Example 3, dodecafluoroheptyl methacrylate is not introduced, and other steps are the same as those in Example 2.

[0040] Comparative Example 4: A preparation method of wear-resistant and anti-slip aluminum profiles for passenger boarding locomotives includes the following processes: The preparation method of the modified silicon carbide is as follows: Step A: The silicon carbide is pickled with dilute hydrochloric acid with a volume fraction of 5%, centrifuged, washed, and dried to obtain pickled nano-silicon carbide; the pickled nano-silicon carbide and 3-(methacryloyloxy)propyltrimethoxysilane are mixed evenly, 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 h. After centrifugation, washing, and drying, double-bond modified silicon carbide is obtained; the mass ratio of pickled nano-silicon carbide, 3-(methacryloyloxy)propyltrimethoxysilane, ethanol, and deionized water is 1:0.5:18:4; Step B: The terminal epoxy group silicone oil and methacrylic acid react at 110 °C for 5 h under the action of benzyltriethylammonium chloride and hydroquinone, and the temperature is lowered to room temperature. Triphenylmethane triisocyanate and dibutyltin dilaurate are added, and the reaction is carried out at 75 °C for 4 h to obtain double-bond isocyanate modified silicone oil; the molar ratio of terminal epoxy group silicone oil, methacrylic acid, and triphenylmethane triisocyanate is 1:1.5:0.5; the dosages of benzyltriethylammonium chloride, hydroquinone, and dibutyltin dilaurate are 0.4%, 0.2%, and 0.1% of the total mass of terminal epoxy group silicone oil and methacrylic acid respectively; Step C: Under nitrogen protection, the double-bond modified silicon carbide, double-bond isocyanate modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate, and toluene are mixed evenly according to a mass ratio of 1:1.5:3:1:45, 2% of azobisisobutyronitrile based on the total mass of the reaction monomers is added, and the reaction is carried out at 75 °C for 11 h. After filtration, washing, and drying, modified silicon carbide is obtained; Compared with Example 2, in Step B of Comparative Example 4, the molar ratio of terminal epoxy group silicone oil, methacrylic acid, and triphenylmethane triisocyanate is 1:1.5:0.5, and other steps are the same as those in Example 2.

[0041] Detection experiment: Experiment 1: Take the wear-resistant and anti-slip aluminum profiles for passenger boarding vehicles obtained in Examples 1-3 and Comparative Examples 1-4, prepare specimens, and use a friction coefficient tester to test the maximum static friction coefficient between the wear-resistant and anti-slip coating and the rubber surface in dry and wet states according to CB / T 10006-2021.

[0042] Experiment 2: Take the wear-resistant and anti-slip aluminum profiles for passenger boarding vehicles obtained in Examples 1-3 and Comparative Examples 1-4, prepare specimens, and determine the wear resistance of the coating according to ASTM D4060-19 using a CS-10 rubber grinding wheel with a mass of 1000 g, and express the wear resistance by the mass loss of the paint film after 500 r of friction cycles.

[0043] Experiment 3: Take the wear-resistant and anti-slip aluminum profiles for passenger boarding vehicles obtained in Examples 1-3 and Comparative Examples 1-4, prepare specimens, and use a contact angle measuring instrument to measure the water contact angle with a volume of 2 μL of deionized water.

[0044] Test results

[0045] Based on the data in the above table, the following conclusions can be clearly obtained: The data of Examples 1-3 show that the wear-resistant and anti-slip coating prepared by the present invention can significantly improve the wear resistance and anti-slip performance of aluminum profiles, while also taking into account the hydrophobic property, and significantly extend its service life. The data of Example 2 and Comparative Example 1 show that the modified silicon carbide prepared by the present invention was not used in Comparative Example 1, and its wear resistance, anti-slip property and hydrophobic property decreased significantly; the data of Example 2 and Comparative Example 2 show that in Example 2, the hydrophobic synergistic effect of the siloxane chain and the fluorocarbon chain was achieved by adding a double-bonded isocyanate-modified silicone oil; the data of Example 2 and Comparative Example 3 show that the hydrophobic property decreased in Comparative Example 3 where dodecafluoroheptyl methacrylate was not added; the data of Example 2 and Comparative Example 4 show that reducing the addition amount of triphenylmethane triisocyanate would lead to a decrease in the compatibility of silicon carbide, and 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 above range can prepare a material with excellent comprehensive performance.

[0046] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

Claims

1. A preparation method of wear-resistant and anti-slip aluminum profiles for passenger boarding vehicles, characterized in that: It includes the following steps: Step 1: Mix polyether polyol, hydroxyl acrylic resin, pigment, defoamer, leveling agent, dispersant, wetting agent, ultraviolet absorber and diluent evenly to obtain Component A; Mix aliphatic polyisocyanate curing agent, accelerator and diluent evenly to obtain Component B; Mix aluminum oxide whiskers and modified silicon carbide evenly to obtain Component C; Step 2: Mix Component A, Component B and Component C evenly to obtain wear-resistant and anti-slip coating; Step 3: Take an aluminum profile, polish, clean and dry its surface, apply a primer on its surface, and after curing, apply the wear-resistant and anti-slip coating to obtain a wear-resistant and anti-slip aluminum profile for passenger boarding vehicles; The preparation method of the modified silicon carbide is as follows: Step A: After pickling silicon carbide with dilute hydrochloric acid, mix the pickled nano-silicon carbide and 3-(methacryloyloxy)propyltrimethoxysilane evenly, add ethanol and deionized water, adjust the pH to 3-4 with oxalic acid, react at 70-90 °C for 10-12 h, and after centrifugation, washing and drying, obtain double-bond modified silicon carbide; Step B: React terminal epoxy group silicone oil and methacrylic acid under the action of a catalyst and an inhibitor at 100-115 °C for 4-6 h, cool to room temperature, add triphenylmethane triisocyanate and dibutyltin dilaurate, and react at 70-80 °C for 3-5 h to obtain double-bond isocyanate modified silicone oil; Step C: Under nitrogen protection, mix double-bond modified silicon carbide, double-bond isocyanate modified silicone oil, methyl methacrylate, dodecafluoroheptyl methacrylate and toluene evenly, add azobisisobutyronitrile, and react at 70-80 °C for 10-12 h. After filtration, washing and drying, obtain modified silicon carbide.

2. The preparation method of a wear-resistant and anti-slip aluminum profile for passenger boarding vehicles according to claim 1, characterized in that: Component A is composed of the following raw materials in parts by weight: 10-20 parts of polyether polyol, 30-40 parts of hydroxyl acrylic resin, 10-15 parts of pigment, 1-2 parts of defoamer, 0.5-1.0 part of leveling agent, 0.3-0.5 part of dispersant, 0.1-0.5 part of wetting agent, 0.1-0.3 part of ultraviolet absorber, and 30-40 parts of diluent.

3. The preparation method of a wear-resistant and anti-slip aluminum profile for passenger boarding vehicles according to claim 1, characterized in that: Component B 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 preparation method of a wear-resistant and anti-slip aluminum profile for passenger boarding vehicles according to claim 1, characterized in that: In Component C, the mass ratio of aluminum oxide whiskers to modified silicon carbide is 1:(2-4).

5. The preparation method of a wear-resistant and anti-slip aluminum profile for passenger boarding vehicles according to claim 1, characterized in that: In Step A, the mass ratio of pickled nano-silicon carbide, 3-(methacryloyloxy)propyltrimethoxysilane, ethanol and deionized water is 1:(0.4-0.6):(15-20):(3-5).

6. The preparation method of a wear-resistant and anti-slip aluminum profile for passenger boarding vehicles according to claim 1, characterized in that: In Step B, the molar ratio of terminal epoxy group silicone oil, methacrylic acid and triphenylmethane triisocyanate is 1:(1-2):(1-2).

7. The preparation method of a wear-resistant and anti-slip aluminum profile for passenger boarding vehicles according to claim 1, characterized in that: In 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).

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

3.

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

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