Elevator traction toothed steel belt and preparation method thereof

Abstract

This application discloses a toothed steel belt for elevator traction and its preparation method. The steel belt comprises a load-bearing body and a polyurethane coating that covers the load-bearing body. The polyurethane coating comprises, by weight, 100 parts of thermoplastic polyurethane, 10-25 parts of a flaky metal / clay composite filler, and 0.5-2 parts of an interfacial modifier. The flaky metal / clay composite filler comprises a flaky clay filler and at least one metal oxide layer coated on the surface of the flaky clay filler. The preparation method of the flaky metal / clay composite filler comprises: assembling organic ligands and metal ions on the surface of the flaky clay filler to form a metal-organic framework; and calcining the metal-organic framework to form a metal oxide layer. The toothed steel belt of this application exhibits excellent water resistance and wear resistance, as well as good toughness and tensile strength.

Description

Technical Field

[0001] The present application relates to the field of elevator traction steel belts, and in particular to a toothed steel belt for elevator traction and a preparation method thereof. Background Art

[0002] The elevator traction system is the core component of elevator operation, and the performance of its traction belt directly affects the overall operation of the elevator. As the key component connecting the car and counterweight, the traction belt not only bears the combined weight of the car, counterweight, and rated load, but also requires sufficient strength and wear resistance to ensure smooth operation and long-term safety of the elevator.

[0003] As described in patent number CN203977213U, conventional traction steel belts utilize multiple internal load-bearing steel wires, coated with polyurethane. This structure leverages the high load-bearing capacity of the steel wires and the excellent flexibility and corrosion resistance of the polyurethane material, ensuring that the traction steel belt maintains sufficient strength while also providing a certain degree of shock absorption and cushioning. However, with the continuous advancement of elevator technology and the increasing performance requirements of high-rise buildings, the limitations of the material properties of conventional traction steel belts have gradually become apparent.

[0004] Specifically, while polyurethane materials meet the corrosion resistance requirements of the traction steel belt to a certain extent, they are significantly deficient in terms of wear resistance and water resistance. During long-term operation of the elevator, the friction between the traction steel belt and the traction sheave causes the surface of the polyurethane material to gradually wear, reducing traction efficiency and even causing slippage, affecting the smoothness and safety of the elevator operation. In addition, as a polar material, polyurethane has poor water resistance. Once it encounters a humid or submerged environment, moisture easily penetrates into the material, causing corrosion of the internal load-bearing steel wires. This corrosion not only weakens the load-bearing capacity of the steel belt, but can also cause serious safety accidents such as steel belt breakage, posing a threat to the safety of elevator operation. Summary of the Invention

[0005] In order to improve the wear resistance and waterproof performance of a traction steel belt, the present application provides a toothed steel belt for elevator traction and a preparation method thereof.

[0006] In a first aspect, the present application provides a toothed steel belt for elevator traction, which comprises a load-bearing body and a polyurethane coating body covering the load-bearing body;

[0007] In parts by mass, the polyurethane coating comprises:

[0008] 100 parts of thermoplastic polyurethane, 10-25 parts of flaky metal / clay composite filler, and 0.5-2 parts of an interfacial modifier; the flaky metal / clay composite filler comprises a flaky clay filler and at least one metal oxide layer coated on the surface of the flaky clay filler; and the preparation method of the flaky metal / clay composite filler comprises: depositing organic ligands and metal ions on the surface of the flaky clay filler to obtain a metal-organic framework; and calcining the metal-organic framework to obtain a metal oxide layer.

[0009] Preferably, the load-bearing body comprises at least one group of linear materials with high tensile strength, and the linear materials are preferably metal wires, polymer fibers or composite materials thereof; more preferably steel wires.

[0010] In some embodiments of the present application, the flaky clay filler may have multiple identical or different metal oxide layers; the metal oxide layer contains at least one metal oxide, that is, the metal oxide layer may be obtained by composite doping of multiple metal oxides.

[0011] Preferably, the polyurethane coating is applied to the surface of the load-bearing body by an extrusion coating machine.

[0012] Preferably, the average diameter of the flaky metal / clay composite filler is 5 to 50 microns and the thickness is 1 to 100 nm.

[0013] The flaky metal / clay composite filler used in this application is based on a flaky clay filler. This high-surface-area clay flake layer significantly blocks the penetration of gas and liquid molecules, increasing diffusion resistance and reducing corrosion of the internal steel wire caused by moisture infiltration from the air. Furthermore, the metal oxide layer coating the flaky clay filler significantly compensates for the clay filler's disadvantages in wear resistance and strength, providing excellent reinforcement, toughness, and wear resistance improvements to the polyurethane body.

[0014] Furthermore, this application utilizes metal-organic ligands to self-assemble into a metal-organic framework, which is then calcined to produce a metal oxide layer. This method offers greater controllability than conventional sol-gel deposition processes, is less susceptible to shrinkage and cracking during calcination, and can form a more uniform and dense metal oxide layer.

[0015] Preferably, the metal oxide is selected from one or more of aluminum oxide, zirconium oxide, zinc oxide and chromium oxide.

[0016] Preferably, the flaky clay filler is selected from one or more of mica, montmorillonite, kaolinite and hydrotalcite.

[0017] Preferably, the preparation method of the flaky metal / clay composite filler comprises:

[0018] Dispersing the flaky clay filler in a solvent, and adding the carboxymethyl chitosan solution under stirring to prepare a dispersed solution;

[0019] Add metal salt compound to the dispersed solution, stir and disperse, then add organic ligand, stir and react to obtain metal organic framework on the surface of flaky clay, filter and separate precipitate, dry and calcine the precipitate to obtain flaky metal / clay composite filler.

[0020] Preferably, the mass ratio of the carboxymethyl chitosan to the flaky clay filler is 2 to 6:100.

[0021] Preferably, the concentration of the carboxymethyl chitosan solution is 5 to 10 wt%.

[0022] Preferably, the deacetylation degree of the carboxymethyl chitosan is greater than 70%, more preferably 80-95%.

[0023] Preferably, the mass ratio of the metal salt compound to the flaky clay filler is 5 to 15:100.

[0024] Preferably, the degree of substitution of the carboxymethyl chitosan is 0.6 to 1.3.

[0025] In the metal-organic framework preparation process, this application pre-loads carboxymethyl chitosan onto the surface of a flaky clay filler. The rich carboxyl and amino groups in the filler act as complexes and polar induction agents to adsorb metal ions, forming uniform active sites. These sites are then coordinated and assembled with organic ligands. Compared to direct self-assembly of organic ligands and metal ions, this method produces a more uniform and dense metal-organic framework, and thus a more uniform and dense metal oxide layer, which helps improve the waterproof, anti-permeability, and wear resistance of the polyurethane.

[0026] Preferably, the interface modifier is selected from one or more of a silane coupling agent, a titanate coupling agent, and an aluminate coupling agent.

[0027] Preferably, the interface modifier is obtained by free radical copolymerization of raw materials comprising the following monomers: unsaturated carboxylic acid, vinyl compound having a nitrogen-containing heterocyclic ring, ethylene glycol diacrylate, wherein the molar ratio of the unsaturated carboxylic acid, vinyl compound having a nitrogen-containing heterocyclic ring, and ethylene glycol diacrylate is 8-13:10:1-5.

[0028] Preferably, the vinyl compound having a nitrogen-containing heterocyclic ring includes one or more of vinyl imidazole, vinyl pyridine, and vinyl pyrrolidone.

[0029] Preferably, the unsaturated carboxylic acid is selected from one or more of acrylic acid, maleic acid, itaconic acid and fumaric acid.

[0030] Preferably, the free radical copolymerization is carried out under the action of an initiator, and the initiator is selected from one or more of sodium persulfide, potassium persulfate, phthaloyl peroxide, and azobisisobutyronitrile.

[0031] The interface modifier of the present application primarily improves the compatibility of the flaky metal / clay composite filler with the polyurethane substrate, while also enhancing the connection strength between the filler and the resin substrate. It should be noted that while interface modifiers such as silane coupling agents, titanate coupling agents, and aluminate coupling agents exhibit good coupling properties, the high crosslinking density of the interface layer formed due to the large number of silanol groups contained in their molecular chains makes the interface layer too brittle and hard, resulting in poor stress absorption and dispersion, leading to brittle cracking of the coupled interface and hindering the improvement of the toughness, wear resistance, and long-term waterproofing properties of the polyurethane coating.

[0032] To this end, this application uses an interfacial modifier obtained by free radical copolymerization of an unsaturated carboxylic acid, a vinyl compound having a nitrogen-containing heterocyclic ring, and ethylene glycol diacrylate. This additive can achieve compatibility, enhance interfacial effects, and ensure the flexibility of the interfacial layer. Specifically, in the raw monomer of the additive, the unsaturated carboxylic acid provides it with a carboxylic acid group, which can form a chemical bond with active groups such as the amino group of the polyurethane resin; the vinyl compound having a nitrogen-containing heterocyclic ring can provide a nitrogen-containing heterocyclic ring with a complexing effect, thereby bonding with the flaky metal / clay composite filler and firmly anchoring the filler in the polymer. The interfacial layer formed in this way has better flexibility than that of a silane coupling agent and is not easy to crack under stress.

[0033] Furthermore, the additive also uses ethylene glycol diacrylate to form a long-chain structure with outstanding flexibility through its chain extension effect, further enhancing the flexibility of the interface layer to ensure the toughness and wear resistance of the polyurethane coating.

[0034] In a second aspect, the present application provides a method for preparing any of the above-mentioned toothed steel belts for elevator traction, comprising:

[0035] The interfacial modifier is mixed with the flaky metal / clay composite filler, stirred evenly, and thermoplastic polyurethane is added. After mixing evenly, the mixture is melted to obtain a molten fluid. The molten fluid is extruded and coated on the surface of the load-bearing body. The coating layer is formed through a mold to obtain a toothed steel belt with the desired structure.

[0036] Preferably, the flaky metal / clay composite filler may be pre-soaked in an acidic solution such as hydrochloric acid or sulfuric acid before being mixed with the interfacial modifier to increase the content of complexable metal ions on its surface.

[0037] In the extrusion coating process, the mold is similar to the extrusion die head, which can form tooth-shaped guide grooves in the polyurethane coating that remains plastic after extrusion coating. The tooth-shaped guide groove is formed by the mold between the polyurethane coatings on any two load-bearing surfaces. Its cross-sectional shape is preferably triangular, semicircular, arc-shaped, etc. For details, please refer to the description of CN102304863A.

[0038] In summary, this application has the following beneficial effects:

[0039] 1. The flaky metal / clay composite filler of the present application can not only utilize the shielding and barrier effect of the flaky clay material to improve the waterproof and anti-permeability properties of the polyurethane coating, but also has the wear resistance and toughening and strengthening effects of metal oxides to meet the use requirements of the traction steel belt.

[0040] 2. The present application prepares an interfacial modifier having a carboxyl group, a nitrogen-containing heterocycle and a flexible molecular chain through free radical copolymerization, which can improve the compatibility between the filler and the resin substrate and the interfacial bonding strength while increasing the flexibility of the interfacial layer to inhibit the damage of the interfacial layer to the strength, toughness and wear resistance of the polyurethane coating caused by brittle cracking. DETAILED DESCRIPTION

[0041] Preparation examples of raw materials and / or intermediates

[0042] Preparation Example 1-1, a flaky metal / clay composite filler, the preparation method is as follows:

[0043] 100g of flaky mica (average length 30 microns, thickness 50nm) and 4g of stearic acid were dispersed in 900mL of water. 50g of a 10wt% aqueous solution of carboxymethyl chitosan was added with stirring to prepare a dispersion. The carboxymethyl chitosan had a degree of substitution of 0.8 and a degree of deacetylation of 90%.

[0044] To the dispersed solution, 13.3 g of AlCl₃ was added and stirred for 20 minutes. Then, 8.3 g of terephthalic acid was added, stirred for 30 minutes, and allowed to stand for 1 hour. This resulted in a metal-organic framework (MOF) on the surface of the clay flakes. The precipitate was separated by filtration and dried in an oven at 60°C for 3 hours. The precipitate was then transferred to a calciner and calcined at 500°C for 2 hours to produce a flaky metal / clay composite filler.

[0045] Preparation Example 1-2, a flaky metal / clay composite filler, the preparation method is as follows:

[0046] 100g of flaky mica (average length 30 microns, thickness 50nm) and 3g of stearic acid were dispersed in 9800mL of water. With stirring, 60g of a 5wt% aqueous solution of carboxymethyl chitosan was added to prepare a dispersion. The carboxymethyl chitosan had a degree of substitution of 0.7 and a degree of deacetylation of 85%.

[0047] To the dispersed solution, 6.8g of AlCl₃ was added and stirred for 20 minutes. Then, 8.3g of terephthalic acid was added, stirred for 30 minutes, and allowed to stand for 1 hour. This resulted in a metal-organic framework (MOF) on the surface of the clay flakes. The precipitate was separated by filtration and dried in a 50°C oven for 5 hours. The precipitate was then transferred to a calciner and calcined at 600°C for 1.5 hours to obtain a flaky metal / clay composite filler.

[0048] Preparation Example 1-3, a flaky metal / clay composite filler, the preparation method is as follows:

[0049] 100g of flaky kaolinite (average length 15 microns, thickness 30nm) and 5g of stearic acid were dispersed in 1000mL of water. 50g of a 10wt% aqueous solution of carboxymethyl chitosan was added with stirring to prepare a dispersion solution. The carboxymethyl chitosan had a degree of substitution of 1.2 and a degree of deacetylation of 90%.

[0050] To the dispersed solution, 6.8g AlCl3 and 2.3g ZrCl4 were added and stirred for 30 minutes. Then, 10.5g terephthalic acid was added, stirred for 45 minutes, and allowed to stand for 1 hour to form a metal-organic framework on the surface of the flaky clay. The precipitate was separated by filtration and dried at 60°C for 3 hours. It was then transferred to a calciner and calcined at 500°C for 2 hours to obtain a flaky metal / clay composite filler.

[0051] Preparation Example 1-4 is a sheet-like metal / clay composite filler, which differs from Preparation Example 1-1 in that the carboxymethyl chitosan is replaced with an equal amount of hydroxyethyl chitosan, wherein the degree of substitution of the hydroxyethyl chitosan is 1.0 and the degree of deacetylation is 90%.

[0052] Preparation Example 1-5 is a flaky metal / clay composite filler, which differs from Preparation Example 1-1 in that no carboxymethyl chitosan aqueous solution is added to the dispersing solvent.

[0053] Preparation Example 2-1, an interface modifier, the preparation method is as follows:

[0054] Add sodium dodecylbenzenesulfonate to water and stir to prepare a 3.5wt% emulsifier solution. Add 11.5g acrylic acid, 10g 1-vinylimidazole, 3.5g ethylene glycol diacrylate, and 0.1g mercaptopropionic acid to 300mL of the emulsifier solution, stir evenly, and heat to 65°C. Then, dropwise add 10g of a 5wt% aqueous solution of dibenzoyl peroxide while stirring. After the addition is complete, allow to react for 2h to obtain the product.

[0055] Preparation Example 2-2, an interface modifier, the preparation method is as follows:

[0056] Add sodium dodecylbenzenesulfonate to water and stir to prepare a 3.5wt% emulsifier solution. Add 8.3g maleic acid, 10g 1-vinylimidazole, 2g ethylene glycol diacrylate, and 0.05g mercaptopropionic acid to 300mL of the emulsifier solution, stir evenly, and heat to 65°C. Then, dropwise add 8g of a 5wt% aqueous solution of dibenzoyl peroxide while stirring. After the addition is complete, allow to react for 2h to obtain the product.

[0057] Preparation Example 2-3, an interface modifier, the preparation method is as follows:

[0058] Add sodium dodecylbenzenesulfonate to water and stir to prepare a 3wt% emulsifier solution. Add 13g acrylic acid, 10g 1-vinylpyridine, 5g ethylene glycol diacrylate, and 0.1g mercaptopropionic acid to 300mL of the emulsifier solution, stir evenly, and heat to 68°C. Then, dropwise add 12g of a 5wt% aqueous solution of dibenzoyl peroxide while stirring. After the addition is complete, allow to react for 2.5 hours to obtain the product.

[0059] Preparation Example 2-4, an interfacial modifier, differs from Preparation Example 2-1 in that 1-vinylimidazole is replaced by an equal amount of acrylic acid.

[0060] Preparation Example 2-5, an interfacial modifier, differs from Preparation Example 2-1 in that acrylic acid is replaced by an equal amount of 1-vinylimidazole.

[0061] Preparation Example 2-6, an interfacial modifier, differs from Preparation Example 2-1 in that ethylene glycol diacrylate is replaced by an equal amount of acrylic acid. Example

[0062] In the embodiment, the thermoplastic polyurethane TPU used is BASF 1195A10, and the diameter of the galvanized steel wire rope is 2 mm.

[0063] Example 1: A toothed steel belt for elevator traction, comprising eight load-bearing elements and a polyurethane coating covering the load-bearing elements, wherein the load-bearing elements are galvanized steel wire ropes. The specific preparation method is as follows:

[0064] Take 1.8 kg of the flaky metal / clay composite filler obtained in Preparation Example 1-1 and 0.12 kg of the interfacial modifier obtained in Preparation Example 2-1, mix them evenly, add 10 kg of thermoplastic polyurethane, mix evenly, and prepare a premix; add the premix to an extrusion coating machine, melt it at 200-210°C to obtain a molten fluid, extrude the molten fluid and coat it on the surface of the galvanized steel wire rope, and form the coating layer through a mold to obtain a toothed steel belt.

[0065] Example 2: A toothed steel belt for elevator traction, comprising eight load-bearing elements and a polyurethane coating covering the load-bearing elements, wherein the load-bearing elements are galvanized steel wire ropes. The specific preparation method is as follows:

[0066] Take 1.0 kg of the flaky metal / clay composite filler obtained in Preparation Example 1-2 and 0.06 kg of the interfacial modifier obtained in Preparation Example 2-2, mix them evenly, add 10 kg of thermoplastic polyurethane, mix evenly, and prepare a premix; add the premix to an extrusion coating machine, melt it at 200-210°C to obtain a molten fluid, extrude the molten fluid and coat it on the surface of the galvanized steel wire, and form the coating layer through a mold to obtain a toothed steel belt with teeth and grooves.

[0067] Example 3: A toothed steel belt for elevator traction, comprising eight load-bearing elements and a polyurethane coating covering the load-bearing elements, wherein the load-bearing elements are galvanized steel wire ropes. The specific preparation method is as follows:

[0068] Take 2.5 kg of the flaky metal / clay composite filler obtained in Preparation Examples 1-3 and 0.2 kg of the interfacial modifier obtained in Preparation Examples 2-3, mix them evenly, add 10 kg of thermoplastic polyurethane, mix evenly, and prepare a premix; add the premix to an extrusion coating machine, melt it at 200-210°C to obtain a molten fluid, extrude the molten fluid and coat it on the surface of the galvanized steel wire, and form the coating layer through a mold to obtain a toothed steel belt with teeth.

[0069] Example 4 is a toothed steel belt for elevator traction. The difference from Example 1 is that the flaky metal / clay composite filler obtained in Preparation Example 1-1 is replaced by an equal amount of the flaky metal / clay composite filler obtained in Preparation Example 1-4.

[0070] Example 5 is a toothed steel belt for elevator traction. The difference from Example 1 is that the flaky metal / clay composite filler obtained in Preparation Example 1-1 is replaced by an equal amount of the flaky metal / clay composite filler obtained in Preparation Example 1-5.

[0071] Example 6 is a toothed steel belt for elevator traction. The difference from Example 1 is that the interface modifier obtained in Preparation Example 2-1 is replaced by an equal amount of the interface modifier obtained in Preparation Example 2-4.

[0072] Example 7, a toothed steel belt for elevator traction, differs from Example 1 in that an equal amount of the interface modifier obtained in Preparation Example 2-5 replaces the interface modifier obtained in Preparation Example 2-1.

[0073] Example 8 is a toothed steel belt for elevator traction. The difference from Example 1 is that the interface modifier obtained in Preparation Example 2-1 is replaced by an equal amount of the interface modifier obtained in Preparation Example 2-6.

[0074] Example 9 is a toothed steel belt for elevator traction. The difference from Example 1 is that the interface modifier obtained in Preparation Example 2-1 is replaced by an equal amount of KH560.

[0075] Example 10 is a toothed steel belt for elevator traction. The difference from Example 1 is that the interface modifier obtained in Preparation Example 2-1 is replaced by an equal amount of KH570. Comparative Example

[0076] Comparative Example 1 is a toothed steel belt for elevator traction, which differs from Example 10 in that the flaky metal / clay composite filler obtained in Preparation Example 1 is replaced by an equal amount of flaky mica (average length of 30 microns and thickness of 50 nm).

[0077] Comparative Example 2 is a toothed steel belt for elevator traction. The difference from Example 10 is that the flaky metal / clay composite filler obtained in Preparation Example 1 is replaced by an equal amount of aluminum oxide (average particle size of 30 μm).

[0078] Performance testing

[0079] Test 1: Toothed steel belt water resistance test

[0080] Place the specimen in a desiccator for 24 hours, then remove and weigh the specimen (m1) using a balance with an accuracy of at least 0.001g. Then, immerse the specimen in distilled water at 80°C ± 2°C for 192 hours ± 2 hours, spacing the specimens to avoid complete contact. Remove the specimen and place it in water at 23°C ± 2°C for 15 minutes. Immediately wipe any water marks on the surface and weigh the specimen (m2). For products with a backing, sample the edge of the specimen. Specimen dimensions: 100 mm × 50 mm.

[0081] The water absorption rate is calculated using formula (1): R m =(m2-m1) / m1×100

[0082] Where:

[0083] R m ——water absorption, expressed as a percentage (%);

[0084] m2——mass of the specimen after immersion in water, in grams (g);

[0085] m1——mass of the specimen before immersion in water, in grams (g);

[0086] The arithmetic mean of the three specimens is taken as the water absorption test result.

[0087] Test 2: Toothed steel belt wear resistance test

[0088] The abrasion quality of the sample is tested in accordance with GB / T30314-2021 "Determination of resistance of rubber or plastic coated fabrics", and the test piece size is 100mm×50mm.

[0089] Test 3: Strength and toughness test of polyurethane coating

[0090] Polyurethane sheets were extruded from the premixes obtained in each example and comparative example. Type 1A specimens were then prepared according to ISO 527-1 / 2:2019, and the tensile strength (MPa) and elongation at break (%) of the specimens were measured.

[0091] Table 1. Test results

[0092]

[0093] Analysis of test results:

[0094] 1. As shown in Examples 1-10, Comparative Examples 1-2, and Table 1, adding a composite filler comprising flaky clay coated with a metal oxide to a polyurethane resin can simultaneously improve the water resistance and wear resistance of the polyurethane coating of the toothed steel belt. This may be because the flaky structure of the flaky clay substrate provides a good physical shielding effect within the resin, providing excellent water resistance, while the coating with the metal oxide layer enhances the filler's hardness and wear resistance.

[0095] 2. As can be seen from Examples 1, 4-5, and Table 1, the use of carboxymethyl chitosan in the preparation of the metal oxide layer is beneficial for improving the waterproof and wear-resistant properties of the polyurethane coating. This may be because carboxymethyl chitosan, through complexation and polarization induction, allows metal ions to form uniform and dense active sites on the surface of the flaky clay filler. This allows the metal ions to assemble with the organic ligands to form a dense metal-organic framework, ultimately resulting in a metal oxide layer with more outstanding performance.

[0096] 3. As can be seen from Examples 1 and 6-10 and Table 1, compared to silane coupling agents, the use of interfacial modifiers with carboxyl groups, nitrogen-containing heterocycles, and flexible molecular chains not only ensures the wear and water resistance of the polyurethane coating, but also improves its mechanical properties such as toughness and strength. This may be because the interface layer formed between the resin and filler by silane coupling agents is too brittle and hard, resulting in poor stress absorption and dispersion, which makes the coupling interface prone to brittle cracking and is not conducive to improving the toughness and strength of the polyurethane coating. The interfacial modification produced by the present application can produce a more flexible interface layer, thereby achieving superior mechanical properties.

[0097] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A toothed steel belt for elevator traction, characterized in that: It comprises a load-bearing body and a polyurethane coating body covering the load-bearing body; In parts by mass, the polyurethane coating comprises: 100 parts of thermoplastic polyurethane, 10-25 parts of flaky metal / clay composite filler, and 0.5-2 parts of an interfacial modifier; the flaky metal / clay composite filler comprises a flaky clay filler and at least one metal oxide layer coated on the surface of the flaky clay filler; The preparation method of the flaky metal / clay composite filler comprises the following steps: Dispersing the flaky clay filler in a solvent, and adding the carboxymethyl chitosan solution under stirring to prepare a dispersed solution; Add metal salt compound to the dispersed solution, stir and disperse, then add organic ligand, stir and react to obtain metal organic framework on the surface of flaky clay, filter and separate precipitate, dry and calcine the precipitate to obtain flaky metal / clay composite filler.

2. The toothed steel belt according to claim 1, characterized in that The metal oxide is selected from one or more of aluminum oxide, zirconium oxide, zinc oxide and chromium oxide.

3. The toothed steel belt according to claim 1, characterized in that The flaky clay filler is selected from one or more of mica, montmorillonite, kaolinite and hydrotalcite.

4. The toothed steel belt according to claim 1, characterized in that The mass ratio of the carboxymethyl chitosan to the flaky clay filler is 2-6:

100.

5. The toothed steel belt according to claim 1, characterized in that The mass ratio of the metal salt compound to the flaky clay filler is 5 to 15:

100.

6. The toothed steel belt according to claim 1, characterized in that The interface modifier is selected from one or more of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, stearic acid, and oleic acid.

7. The toothed steel belt according to claim 1, characterized in that The interface modifier is obtained by free radical copolymerization of raw materials containing the following monomers: unsaturated carboxylic acid, vinyl compound with nitrogen-containing heterocyclic ring, and ethylene glycol diacrylate, wherein the molar ratio of the unsaturated carboxylic acid, vinyl compound with nitrogen-containing heterocyclic ring, and ethylene glycol diacrylate is 8-13:10:1-5.

8. The toothed steel belt according to claim 7, characterized in that The vinyl compound having a nitrogen-containing heterocyclic ring includes one or more of vinyl imidazole, vinyl pyridine, and vinyl pyrrolidone; the unsaturated carboxylic acid is selected from one or more of acrylic acid, maleic acid, itaconic acid, and fumaric acid.

9. A method for preparing a toothed steel belt for elevator traction according to any one of claims 1 to 8, characterized in that: include: The interfacial modifier is mixed with the flaky metal / clay composite filler, stirred evenly, and thermoplastic polyurethane is added. After mixing evenly, the mixture is melted to obtain a molten fluid. The molten fluid is extruded and coated on the surface of the load-bearing body. The coating layer is formed through a mold to obtain a toothed steel belt with the desired structure.

Images