Anti-collision strip for freight elevator, installation method and its application

Abstract

The present invention discloses an anti-collision strip for a freight elevator, an installation method thereof and an application, belonging to the technical field of the preparation process of anti-collision strips. The anti-collision strip includes a body made of soft PVC material, which is prepared by a specific formula and process to enhance its mechanical properties and weather resistance. The body is designed without screw holes to keep the appearance clean and beautiful, and the chamfer design facilitates hanging and installation. The anti-collision strip is installed on a bracket made of galvanized sheet, and the bracket has bolt mounting holes and self-tapping and self-drilling screws to fix the anti-collision strip body. When an impact occurs, the bracket can disperse the impact force to the entire anti-collision strip, reducing damage to the elevator car wall. Compared with the prior art, the anti-collision strip of the present invention has a reasonable structural design, is easy to install, has a beautiful appearance, and can effectively improve the safety and service life of the freight elevator.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation process of anti-collision strips, and particularly relates to an anti-collision strip for a freight elevator, an installation method thereof, and an application thereof. Background Art

[0002] In the field of freight elevators, anti-collision strips are important components for protecting elevator car walls from being damaged by goods impacts. However, there are some limitations in the design of traditional anti-collision strips, which bring a series of problems in practical applications.

[0003] In early designs, anti-collision strips for freight elevators were usually installed by punching holes throughout the entire strip. This design has brought the following main problems: Localized concentrated stress: Traditional anti-collision strips are designed as flexible components and are fixed by punching holes for installation. When an impact occurs, the impact force often concentrates on a few installation points, causing the car wall at the stress point or local area to be easily damaged. This localized concentrated stress not only reduces the protective effect of the anti-collision strip but also may accelerate the wear and damage of the elevator car wall. Unstable installation hole dimensions: Soft PVC materials are relatively sensitive to environmental factors. For example, changes in temperature and humidity may cause the material to expand or contract, thereby affecting the dimensions of the preset hole positions. This makes the installation holes reserved on the car wall by elevator manufacturers may not match the actual hole positions of the anti-collision strip, resulting in the anti-collision strip being unable to be correctly installed. To solve this problem, it is usually necessary to re-punch holes on-site according to the actual hole positions of the PVC parts, which not only increases the complexity of installation but also prolongs the construction time. Appearance damage: In the design of traditional anti-collision strips, the installation screws are exposed on the outer surface of the anti-collision strip, which not only affects the aesthetics inside the elevator but also may become an obstacle to cleaning and maintenance. The exposed screws may also catch on packaging materials during the goods handling process, causing unnecessary damage. Low processing efficiency: The traditional method of processing countersunk installation holes on PVC parts usually relies on manual operation or low-efficiency machining, which results in low machining dimensional accuracy and low production efficiency. This low-efficiency processing method increases production costs and also limits the large-scale and automated production of anti-collision strips.

[0004] In view of the above problems, there is an urgent need in the market for a new design of anti-collision strips for freight elevators that can provide more uniform impact force dispersion, simplify the installation process, improve the appearance neatness, and enhance the processing efficiency.

[0005] In the prior art, Chinese invention patent CN104351988A discloses a connection process for a PVC anti-collision strip and a nitrile glove, which includes the following steps: (1) Place the already manufactured PVC anti-collision strip in an aluminum mold; (2) Use a copper knife die to punch the hot melt adhesive film into the size and shape of the anti-collision strip in step (1); (3) Stick the hot melt adhesive film punched in step (2) on the anti-collision strip described in step (1); (4) Place the aluminum mold under the pressure plate of the high-frequency machine, and put the nitrile glove on the hand mold; (5) Adjust the current and working time of the high-frequency machine, press the connection button, the head of the high-frequency machine presses down to the mold, the current instantly raises the temperature of the pressure plate, and the hot melt adhesive undergoes morphological remodeling to connect the anti-collision strip and the nitrile glove together. This invention replaces the traditional sewing process, reduces equipment investment, greatly improves work efficiency, and the PVC anti-collision strip of the produced labor protection gloves is firmly adhered and not easy to fall off; it realizes the production purpose of low cost and high output. However, the mechanical properties of the PVC anti-collision strip of this invention are poor and the aging resistance is not high. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention aims to provide an anti-collision strip for a freight elevator, an installation method and its application with better performance, simpler installation and more beautiful appearance.

[0007] In order to achieve the above invention purpose, the present invention adopts the following technical solutions:

[0008] An anti-collision strip for a freight elevator, including:

[0009] A. An anti-collision strip body 1 made of soft PVC material;

[0010] B. A bracket 2 for supporting the anti-collision strip body 1;

[0011] C. The anti-collision strip body 1 is provided with a chamfer for hanging down from the upper end to the bracket 2;

[0012] D. The bracket 2 is provided with bolt 3 mounting holes and self-tapping and self-drilling screws 4 for fixing the anti-collision strip body 1;

[0013] E. When the anti-collision strip body 1 is impacted, the impact force can be dispersed to the entire anti-collision strip body 1 through the bracket 2.

[0014] The bracket 2 is of an integral rigid structure and can disperse the impact force to the entire anti-collision strip body 1 when being impacted.

[0015] The outer surface of the anti-collision strip body 1 has no screw holes to keep the overall neat and beautiful.

[0016] The bracket 2 is made of a galvanized sheet with a thickness of 1 - 3 mm.

[0017] The installation method of the anti-collision strip for the freight elevator includes the following steps:

[0018] (1) Fix the bracket 2 with bolts 3;

[0019] (2) Hang the anti-collision strip body 1 from the upper end down to the bracket 2;

[0020] (3) Tighten the self-tapping and self-drilling screw 4 to fix the anti-collision strip body 1;

[0021] (4) When an impact occurs, disperse the impact force to the whole anti-collision strip body 1 through the bracket 2.

[0022] The preparation method of the soft PVC material is as follows, by weight:

[0023] S1. In a premixing device, mix 2 - 4 parts of polyethylene oxide, 1 - 3 parts of nylon 66, 0.2 - 0.4 parts of epoxidized soybean oil, and 0.01 - 0.03 parts of tris(2-ethylhexyl) phosphate for 20 - 40 minutes; then, raise the temperature to 70 - 80 °C, and add 0.01 - 0.03 parts of butylated hydroxyanisole at this temperature, and continue stirring until this component is completely dissolved;

[0024] S2. Then, add 8 - 12 parts of PVC resin to the premixing device, and stir at a speed of 100 - 300 revolutions per minute, while gradually raising the temperature to 70 - 90 °C; during this process, sequentially add 0.05 - 0.2 parts of zinc stearate, 0.1 - 0.3 parts of dibutyltin dilaurate, 0.4 - 0.6 parts of modified filler, 0.1 - 0.3 parts of brominated polystyrene, 0.2 - 0.4 parts of sodium bicarbonate, 0.05 - 0.2 parts of stearamide, 0.05 - 0.2 parts of sorbitol, 0.4 - 0.6 parts of di-tert-butyl peroxide, and 0.1 - 0.3 parts of inorganic pigment, control the flow direction of the material to ensure uniform mixing, and obtain the premixed material;

[0025] S3. Add the premixed material to the reaction vessel by spraying; then, raise the temperature in the reaction vessel to 130 - 150 °C, and transfer the material to the cooling device through high-speed stirring at 400 - 600 revolutions per minute;

[0026] S4. After the material is stirred and cooled to room temperature in the cooling device, take it out; send the cooled material into a planetary extruder, and extrude it under the temperature control of 130 - 150 °C; the extruded material enters a calender, and is calendered at a temperature of 180 - 200 °C to form a sheet; finally, cool the calendered sheet to room temperature, and perform winding and packaging.

[0027] The inorganic pigment is at least one of titanium dioxide, iron oxide red, chromium oxide green, and silica white.

[0028] The preparation method of the modified filler is as follows, by weight:

[0029] Z1. After pulping and desanding 0.5 - 2 parts of montmorillonite, add 0.005 - 0.02 parts of potassium chloride and 0.01 - 0.03 parts of magnesium carbonate; heat under high-speed stirring, with a heating rate of 4 - 6 °C / min, heat up to 800 - 950 °C and treat for 10 - 30 minutes to obtain calcined montmorillonite;

[0030] Z2. Cool the calcined montmorillonite to 65 - 75 °C, add 0.005 - 0.02 parts of titanate coupling agent and 0.005 - 0.02 parts of palmitic acid respectively, stir for 10 - 30 minutes to obtain a mixture; add the mixture to a high-speed mixer at 50 - 70 °C, add 0.05 - 0.2 parts of methacrylic acid and 0.001 - 0.003 parts of azobisisobutyronitrile, stir for 2 - 4 hours; raise the temperature of the mixer to 120 - 140 °C and stir at high speed for 1 - 3 hours to obtain pretreated montmorillonite;

[0031] Z3. Dissolve 0.1 - 0.3 parts of sodium lauryl sulfate and 0.01 - 0.03 parts of 2,4,6 - trihydroxybenzoic acid in 0.8 - 1.2 parts of polyphosphoric acid, react at 180 - 220 °C for 4 - 6 hours; cool to room temperature, wash with acetone, filter, and dry at 80 - 120 °C for 5 - 15 hours to obtain a grafting agent;

[0032] Z4. Mix 0.8 - 1.2 parts of pretreated montmorillonite with 0.2 - 0.4 parts of grafting agent and 0.005 - 0.02 parts of carbon fiber in a high-speed mixer at 80 - 120 °C for 1 - 3 hours, and cool to room temperature to obtain the modified filler.

[0033] The application of the anti-collision strip for the freight elevator is to provide protection on the car wall of the freight elevator to reduce the impact damage that may be caused to the elevator wall during the cargo transportation process and improve the operation safety.

[0034] In the present invention, the functions of each substance are as follows:

[0035] The soft PVC material serves as the main component of the anti-collision strip body, providing basic physical properties such as flexibility and impact resistance.

[0036] Polyethylene oxide acts as a plasticizer or compatibilizer in the preparation of PVC material to improve the processing performance and flexibility.

[0037] Nylon 66 may act as a reinforcing material to improve the mechanical strength and heat resistance of PVC.

[0038] Epoxidized soybean oil acts as a plasticizer or stabilizer, helping to improve the flexibility and aging resistance of PVC material.

[0039] Tris(2-ethylhexyl) phosphate is used as a plasticizer or processing aid to improve the processing performance of PVC.

[0040] Butylated hydroxyanisole is used as an antioxidant to improve the heat and oxygen aging resistance of PVC materials.

[0041] Zinc stearate is used as a stabilizer to prevent the thermal decomposition of PVC during processing and use.

[0042] Dibutyltin dilaurate is used as a heat stabilizer for PVC to improve the thermal stability and weather resistance of the material.

[0043] Modified fillers improve the mechanical properties of PVC materials, such as strength, stiffness, aging resistance, and wear resistance.

[0044] Brominated polystyrene may be used as a flame retardant to improve the flame retardancy of PVC materials.

[0045] Sodium bicarbonate may be used as a pH regulator or foaming agent in the preparation of PVC materials.

[0046] Stearamide is used as a lubricant to improve the processing performance of PVC materials.

[0047] Sorbitol is used as a plasticizer to improve the flexibility and processing performance of PVC materials.

[0048] Di-tert-butyl peroxide is used as a crosslinking agent to increase the crosslinking density of PVC materials and enhance their mechanical properties.

[0049] Inorganic pigments (titanium dioxide, iron oxide red, chromium oxide green, silica white) provide color and covering power, and improve the weather resistance and stability of PVC materials.

[0050] Montmorillonite, as the main component of modified fillers, provides an enhancing effect.

[0051] Potassium chloride and magnesium carbonate may be used as fluxes or promoters during the calcination of montmorillonite.

[0052] Titanate coupling agent is used as a surface modifier for montmorillonite to improve its compatibility with the PVC matrix and enhancing effect.

[0053] Palmitic acid may be used as a coupling agent or lubricant to improve the compatibility between montmorillonite and PVC.

[0054] Methacrylic acid may be used as a grafting agent during the pretreatment of montmorillonite to enhance the chemical bonding between montmorillonite and PVC.

[0055] Sodium lauryl sulfate and 2,4,6-trihydroxybenzoic acid may be used as reactants in the preparation of grafting agents for synthesizing grafting agents with specific functions.

[0056] Polyphosphoric acid is used as a solvent or reaction medium in the synthesis of the grafting agent.

[0057] Carbon fiber is used as a reinforcing material for modified fillers to improve the mechanical strength and heat resistance of PVC materials.

[0058] The combination and interaction of these substances make the anti-collision strip of the present invention have good mechanical properties and weather resistance, while maintaining a good appearance and ease of installation.

[0059] Compared with the prior art, it has the following beneficial effects:

[0060] 1) The new anti-collision strip of the present invention adopts an integrally rigid metal bracket, which can more effectively disperse the impact force to the entire anti-collision strip when it is hit, thereby reducing local damage to the car wall.

[0061] 2) The new design of the present invention allows the elevator factory to reserve installation holes on the car wall, so that the construction site can be directly installed without the need to process the installation holes on site, which simplifies the installation process and improves efficiency.

[0062] 3) The outer surface of the anti-collision strip body of the present invention has no screw holes, and adopts the method of hook connection and self-drilling screws, which makes the appearance more neat and beautiful, and reduces the risk of damage caused by exposed screws.

[0063] 4) The design of the new anti-collision strip of the present invention reduces the problem of PVC part hole size changes caused by environmental factors, reducing the risk of installation failure. In addition, the design of self-drilling screws makes replacement and removal more convenient, improving the convenience of maintenance.

[0064] 4) The soft PVC material of the present invention provides a material with optimized physical properties and processing properties, achieving a significant improvement in the mechanical properties and weather resistance of the material, so that the manufactured anti-collision strip maintains flexibility and impact resistance while also showing better durability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 The utility model relates to an anti-collision strip for a freight elevator of the present invention.

[0066] In the figure: 1. Anti-collision strip body; 2. Bracket; 3. Bolt; 4. Self-drilling screw.

[0067] Figure 2 It is a bolt installation hole in the anti-collision strip for the freight elevator of the present invention.

[0068] Figure 3 When the anti-collision strip for a freight elevator of the present invention is installed, the bracket is first fixed, and the soft PVC material is hung from the upper end downward on the bracket. The soft PVC material has chamfers for easy hanging.

[0069] Figure 4 When installing the anti-collision strip for the freight elevator of the present invention, hang it and then tighten the bottom screws. Specific embodiments

[0070] Polyethylene oxide: average molecular weight: 100,000, purchased from Merck.

[0071] Nylon 66: molecular weight ≥ 226.14, purchased from Merck.

[0072] Epoxidized soybean oil: single product item number: 104654, main use: PVC plasticizer, Jinan Luying Chemical Co., Ltd.

[0073] PVC resin: model: SG-3, Wenzhou Zhengbang Chemical Co., Ltd.

[0074] Brominated polystyrene: product model: BPS, Wuhan Huaxiang Kejie Biotechnology Co., Ltd.

[0075] Montmorillonite: item number: gc-006, Shijiazhuang Gaocheng New Material Technology Co., Ltd.

[0076] Titanate coupling agent: single product item number: NDZ-201, Dongguan Dinghai Plastic Chemical Co., Ltd.

[0077] Aluminate coupling agent: product model: coupling agent DL-411, Dongguan Kangjin New Material Technology Co., Ltd.

[0078] Silane coupling agent: product model: coupling agent KH-550, Henan Lichi Fine Chemical Co., Ltd.

[0079] Kaolin: item number: AB-12, mesh number: 1250 mesh, Shijiazhuang Anbai Mining Co., Ltd.

[0080] Talc powder: item number: 08, Shandong Tajun Industry and Trade Co., Ltd.

[0081] Polyphosphoric acid: CAS number: 8017-16-1, Jinan Huifengda Chemical Co., Ltd.

[0082] Carbon fiber: item number: 021563, thickness: 7 - 13μm, length: 3 - 50mm, Jiangsu Kangdafu New Material Technology Co., Ltd.

[0083] Carbon nanotubes: model: NACODC8, length ≤ 10μm, tube diameter: 40 - 60nm, Jiaxing Bona New Materials Co., Ltd.

[0084] Graphene: model: LN-1P, fineness: 2000 mesh, Zhengzhou Kaichi Chemical Products Co., Ltd.

[0085] In the examples and comparative examples of the present invention, the remaining raw materials are all commercially available products.

[0086] The design concept of the present invention is to combine the excellent physical properties of soft PVC materials and the reinforcing effect of specific modified fillers to develop an anti-collision strip for freight elevators with a clever structural design, simple installation, and the ability to effectively disperse and absorb impact force when impacted. Through the carefully designed bracket structure and the screw-hole-free appearance of the anti-collision strip body, the neatness, beauty, and practicality of the product are achieved. At the same time, through the design of the reinforcing column, the safety and durability of the anti-collision strip in actual use are improved. In addition, by using specific modified fillers, the mechanical properties and weather resistance of the material are further enhanced, ensuring the stability and reliability of the anti-collision strip in long-term use.

[0087] Example 1

[0088] An anti-collision strip for a freight elevator, comprising:

[0089] A. An anti-collision strip body 1 made of soft PVC material, the outer surface of the anti-collision strip body has no screw holes to maintain the overall neatness and beauty;

[0090] B. A bracket 2, which is made of 2.0 mm thick galvanized sheet and is used to support the anti-collision strip body 1. The bracket 2 is an integral rigid structure and can disperse the impact force to the entire anti-collision strip body 1 when impacted;

[0091] C. The anti-collision strip body 1 is provided with a chamfer to facilitate hanging it from the upper end onto the bracket 2;

[0092] D. The bracket 2 is provided with bolt 3 mounting holes and self-drilling and self-tapping screws 4 for fixing the anti-collision strip body 1;

[0093] E. When the anti-collision strip body 1 is impacted, the impact force can be dispersed to the entire anti-collision strip body 1 through the bracket 2.

[0094] The installation method of the anti-collision strip for a freight elevator includes the following steps:

[0095] (1) Fix the bracket 2 with bolts 3;

[0096] (2) Hang the anti-collision strip body 1 from the upper end onto the bracket 2;

[0097] (3) Tighten the self-drilling and self-tapping screws 4 to fix the anti-collision strip body 1;

[0098] (4) When an impact occurs, disperse the impact force to the entire anti-collision strip body 1 through the bracket 2.

[0099] The preparation method of the soft PVC material is as follows:

[0100] S1. Mix 3 kg of polyethylene oxide, 2 kg of nylon 66, 0.3 kg of epoxidized soybean oil, and 0.02 kg of tris(2-ethylhexyl) phosphate in a premixing device for 30 minutes. Then, raise the temperature to 75°C and add 0.02 kg of butylated hydroxyanisole at this temperature. Continue stirring until the component is completely dissolved.

[0101] S2. Next, add 10 kg of PVC resin to the premixing device and stir at a speed of 200 revolutions per minute while gradually raising the temperature to 80°C. During this process, sequentially add 0.1 kg of zinc stearate, 0.2 kg of dibutyltin dilaurate, 0.5 kg of modified filler, 0.2 kg of brominated polystyrene, 0.3 kg of sodium bicarbonate, 0.1 kg of stearamide, 0.1 kg of sorbitol, 0.5 kg of di-tert-butyl peroxide, and 0.2 kg of titanium dioxide. Control the flow direction of the material to ensure uniform mixing and obtain a premixed material.

[0102] S3. Add the premixed material to the reaction vessel by spraying. Then, raise the temperature in the reaction vessel to 140°C and transfer the material to the cooling device by high-speed stirring at 500 revolutions per minute.

[0103] S4. Take out the material after it is stirred and cooled to room temperature in the cooling device. Feed the cooled material into a planetary extruder and extrude it under a temperature control of 140°C. The extruded material enters a calender and is calendered at a temperature of 190°C to form a sheet. Finally, cool the calendered sheet to room temperature and wind it up and package it.

[0104] The preparation method of the modified filler is as follows:

[0105] Z1. After pounding and desanding 1 kg of montmorillonite, add 0.01 kg of potassium chloride and 0.02 kg of magnesium carbonate. Heat it under high-speed stirring with a heating rate of 5°C / min and heat it to 900°C for 20 minutes to obtain calcined montmorillonite.

[0106] Z2. Cool the calcined montmorillonite to 70°C, add 0.01 kg of titanate coupling agent and 0.01 kg of palmitic acid respectively, and stir for 20 minutes to obtain a mixture. Add 0.1 kg of methacrylic acid and 0.002 kg of azobisisobutyronitrile to the mixture in a high-speed mixer at 60°C and stir for 3 hours. Raise the temperature of the mixer to 130°C and stir at high speed for 2 hours to obtain pretreated montmorillonite.

[0107] Z3. Dissolve 0.2 kg of sodium lauryl sulfate and 0.02 kg of 2,4,6-trihydroxybenzoic acid in 1 kg of polyphosphoric acid, and react at 200 °C for 5 hours; cool to room temperature, wash with acetone, filter, and dry at 100 °C for 10 hours to obtain a grafting agent;

[0108] Z4. Mix 1 kg of pretreated montmorillonite with 0.3 kg of the grafting agent and 0.01 kg of carbon fiber in a high-speed mixer at 100 °C for 2 hours, and cool to room temperature to obtain a modified filler.

[0109] Example 2

[0110] An anti-collision strip for a freight elevator is basically the same as that in Example 1, and the only difference is the preparation method of the modified filler.

[0111] The preparation method of the modified filler is as follows:

[0112] Z1. After pulping and sand removal of 1 kg of kaolin; add 0.01 kg of potassium chloride and 0.02 kg of magnesium carbonate; heat under high-speed stirring conditions, with a heating rate of 5 °C / min, and heat to 900 °C for 20 minutes to obtain calcined kaolin;

[0113] Z2. Cool the calcined kaolin to 70 °C, add 0.01 kg of titanate coupling agent and 0.01 kg of palmitic acid respectively, and stir for 20 minutes to obtain a mixture; add the mixture to a high-speed mixer at 60 °C, add 0.1 kg of methacrylic acid and 0.002 kg of azobisisobutyronitrile, and stir for 3 hours; raise the temperature of the mixer to 130 °C and stir at high speed for 2 hours to obtain pretreated kaolin;

[0114] Z3. Dissolve 0.2 kg of sodium lauryl sulfate and 0.02 kg of 2,4,6-trihydroxybenzoic acid in 1 kg of polyphosphoric acid, and react at 200 °C for 5 hours; cool to room temperature, wash with acetone, filter, and dry at 100 °C for 10 hours to obtain a grafting agent;

[0115] Z4. Mix 1 kg of pretreated kaolin with 0.3 kg of the grafting agent and 0.01 kg of carbon fiber in a high-speed mixer at 100 °C for 2 hours, and cool to room temperature to obtain a modified filler.

[0116] The installation method of the anti-collision strip for the freight elevator is the same as that in Example 1.

[0117] The preparation method of the soft PVC material is the same as that in Example 1.

[0118] Example 3

[0119] An anti-collision strip for a freight elevator is basically the same as that in Example 1, and the only difference is the preparation method of the modified filler.

[0120] The preparation method of the modified filler is as follows:

[0121] Z1. After pulping and desanding 1 kg of talcum powder, add 0.01 kg of potassium chloride and 0.02 kg of magnesium carbonate, heat under high-speed stirring conditions, with a heating rate of 5 °C / min, heat up to 900 °C and treat for 20 minutes to obtain calcined talcum powder;

[0122] Z2. Cool the calcined talcum powder to 70 °C, add 0.01 kg of titanate coupling agent and 0.01 kg of palmitic acid respectively, stir for 20 minutes to obtain a mixture; add the mixture to a high-speed mixer at 60 °C, add 0.1 kg of methacrylic acid and 0.002 kg of azobisisobutyronitrile, stir for 3 hours; raise the temperature of the mixer to 130 °C and stir at high speed for 2 hours to obtain pretreated talcum powder;

[0123] Z3. Dissolve 0.2 kg of sodium lauryl sulfate and 0.02 kg of 2,4,6-trihydroxybenzoic acid in 1 kg of polyphosphoric acid, react at 200 °C for 5 hours; cool to room temperature, wash with acetone, filter, and dry at 100 °C for 10 hours to obtain a grafting agent;

[0124] Z4. Mix 1 kg of pretreated talcum powder with 0.3 kg of grafting agent and 0.01 kg of carbon fiber in a high-speed mixer at 100 °C for 2 hours, and cool to room temperature to obtain the modified filler.

[0125] The installation method of the anti-collision strip for the freight elevator is the same as that in Example 1.

[0126] The preparation method of the soft PVC material is the same as that in Example 1.

[0127] Example 4

[0128] An anti-collision strip for a freight elevator is basically the same as that in Example 1, and the only difference is that the preparation method of the modified filler is different.

[0129] The preparation method of the modified filler is as follows:

[0130] Z1. After pulping and desanding 1 kg of montmorillonite, add 0.01 kg of potassium chloride and 0.02 kg of magnesium carbonate, heat under high-speed stirring conditions, with a heating rate of 5 °C / min, heat up to 900 °C and treat for 20 minutes to obtain calcined montmorillonite;

[0131] Z2. Cool the calcined montmorillonite to 70°C, add 0.01 kg of aluminate coupling agent and 0.01 kg of palmitic acid respectively, and stir for 20 minutes to obtain a mixture; add the mixture to a high-speed mixer at 60°C, add 0.1 kg of methacrylic acid and 0.002 kg of azobisisobutyronitrile, and stir for 3 hours; raise the temperature of the mixer to 130°C and stir at high speed for 2 hours to obtain pretreated montmorillonite;

[0132] Z3. Dissolve 0.2 kg of sodium lauryl sulfate and 0.02 kg of 2,4,6-trihydroxybenzoic acid in 1 kg of polyphosphoric acid, react at 200°C for 5 hours; cool to room temperature, wash with acetone, filter, and dry at 100°C for 10 hours to obtain a grafting agent;

[0133] Z4. Mix 1 kg of pretreated montmorillonite with 0.3 kg of grafting agent and 0.01 kg of carbon fiber in a high-speed mixer at 100°C for 2 hours, and cool to room temperature to obtain a modified filler.

[0134] The installation method of the anti-collision strip for the freight elevator is the same as that in Example 1.

[0135] The preparation method of the soft PVC material is the same as that in Example 1.

[0136] Example 5

[0137] An anti-collision strip for a freight elevator is basically the same as that in Example 1, and the only difference is that the preparation method of the modified filler is different.

[0138] The preparation method of the modified filler is as follows:

[0139] Z1. After pulping and sand removal of 1 kg of montmorillonite; add 0.01 kg of potassium chloride and 0.02 kg of magnesium carbonate; heat under high-speed stirring conditions, with a heating rate of 5°C / min, and heat to 900°C for 20 minutes to obtain calcined montmorillonite;

[0140] Z2. Cool the calcined montmorillonite to 70°C, add 0.01 kg of silane coupling agent and 0.01 kg of palmitic acid respectively, and stir for 20 minutes to obtain a mixture; add the mixture to a high-speed mixer at 60°C, add 0.1 kg of methacrylic acid and 0.002 kg of azobisisobutyronitrile, and stir for 3 hours; raise the temperature of the mixer to 130°C and stir at high speed for 2 hours to obtain pretreated montmorillonite;

[0141] Z3. Dissolve 0.2 kg of sodium lauryl sulfate and 0.02 kg of 2,4,6-trihydroxybenzoic acid in 1 kg of polyphosphoric acid, react at 200°C for 5 hours; cool to room temperature, wash with acetone, filter, and dry at 100°C for 10 hours to obtain a grafting agent;

[0142] Z4. Mix 1 kg of pretreated montmorillonite with 0.3 kg of grafting agent and 0.01 kg of carbon fiber in a high-speed mixer at 100 °C for 2 hours, and cool to room temperature to obtain the modified filler.

[0143] The installation method of the anti-collision strip for the freight elevator is the same as that in Example 1.

[0144] The preparation method of the soft PVC material is the same as that in Example 1.

[0145] Example 6

[0146] An anti-collision strip for a freight elevator is basically the same as that in Example 1, and the only difference is the preparation method of the modified filler.

[0147] The preparation method of the modified filler is as follows:

[0148] Z1. After pulping and sand removal of 1 kg of montmorillonite, add 0.01 kg of potassium chloride and 0.02 kg of magnesium carbonate; heat under high-speed stirring conditions, with a heating rate of 5 °C / min, and heat to 900 °C for 20 minutes to obtain calcined montmorillonite;

[0149] Z2. Cool the calcined montmorillonite to 70 °C, add 0.01 kg of titanate coupling agent and 0.01 kg of palmitic acid respectively, and stir for 20 minutes to obtain a mixture; add the mixture to a high-speed mixer at 60 °C, add 0.1 kg of methacrylic acid and 0.002 kg of azobisisobutyronitrile, and stir for 3 hours; raise the temperature of the mixer to 130 °C and stir at high speed for 2 hours to obtain pretreated montmorillonite;

[0150] Z3. Dissolve 0.2 kg of sodium lauryl sulfate and 0.02 kg of 2,4,6-trihydroxybenzoic acid in 1 kg of polyphosphoric acid, react at 200 °C for 5 hours; cool to room temperature, wash with acetone, filter, and dry at 100 °C for 10 hours to obtain the grafting agent;

[0151] Z4. Mix 1 kg of pretreated montmorillonite with 0.3 kg of grafting agent and 0.01 kg of carbon nanotubes in a high-speed mixer at 100 °C for 2 hours, and cool to room temperature to obtain the modified filler.

[0152] The installation method of the anti-collision strip for the freight elevator is the same as that in Example 1.

[0153] The preparation method of the soft PVC material is the same as that in Example 1.

[0154] Example 7

[0155] An anti-collision strip for a freight elevator is basically the same as that in Example 1, and the only difference is the preparation method of the modified filler.

[0156] The preparation method of the modified filler is as follows:

[0157] Z1. After pounding and desanding 1 kg of montmorillonite, add 0.01 kg of potassium chloride and 0.02 kg of magnesium carbonate; heat under high-speed stirring, with a heating rate of 5 °C / min, heat up to 900 °C and treat for 20 minutes to obtain calcined montmorillonite;

[0158] Z2. Cool the calcined montmorillonite to 70 °C, add 0.01 kg of titanate coupling agent and 0.01 kg of palmitic acid respectively, and stir for 20 minutes to obtain a mixture; add the mixture to a high-speed mixer at 60 °C, add 0.1 kg of methacrylic acid and 0.002 kg of azobisisobutyronitrile, and stir for 3 hours; raise the temperature of the mixer to 130 °C and stir at high speed for 2 hours to obtain pretreated montmorillonite;

[0159] Z3. Dissolve 0.2 kg of sodium lauryl sulfate and 0.02 kg of 2,4,6-trihydroxybenzoic acid in 1 kg of polyphosphoric acid, react at 200 °C for 5 hours; cool to room temperature, wash with acetone, filter, and dry at 100 °C for 10 hours to obtain a grafting agent;

[0160] Z4. Mix 1 kg of pretreated montmorillonite with 0.3 kg of grafting agent and 0.01 kg of graphene in a high-speed mixer at 100 °C for 2 hours, and cool to room temperature to obtain the modified filler.

[0161] The installation method of the anti-collision strip for the freight elevator is the same as that in Example 1.

[0162] The preparation method of the soft PVC material is the same as that in Example 1.

[0163] Comparative Example 1

[0164] An anti-collision strip for a freight elevator is basically the same as that in Example 1, and the only difference is that the preparation method of the soft PVC material is different.

[0165] The preparation method of the soft PVC material is as follows:

[0166] S1. Mix 3 kg of polyethylene oxide, 2 kg of nylon 66, 0.3 kg of epoxidized soybean oil, and 0.02 kg of tris(2-ethylhexyl) phosphate in a premixing device for 30 minutes; then, raise the temperature to 75 °C, and add 0.02 kg of butylated hydroxyanisole at this temperature, and continue stirring until the component is completely dissolved;

[0167] S2. Next, add 10 kg of PVC resin to the premixing equipment and stir at a speed of 200 revolutions per minute while gradually raising the temperature to 80°C. During this process, sequentially add 0.1 kg of zinc stearate, 0.2 kg of dibutyltin dilaurate, 0.5 kg of montmorillonite, 0.2 kg of brominated polystyrene, 0.3 kg of sodium bicarbonate, 0.1 kg of stearamide, 0.1 kg of sorbitol, 0.5 kg of di-tert-butyl peroxide, and 0.2 kg of titanium dioxide. Control the flow direction of the materials to ensure uniform mixing and obtain the premixed materials.

[0168] S3. Add the premixed materials to the reaction vessel by spraying. Subsequently, raise the temperature in the reaction vessel to 140°C and transfer the materials to the cooling equipment through high-speed stirring at 500 revolutions per minute.

[0169] S4. Take out the materials after they are stirred and cooled to room temperature in the cooling equipment. Feed the cooled materials into a planetary extruder and extrude them under temperature control at 140°C. The extruded materials enter a calender and are calendered at a temperature of 190°C to form sheets. Finally, cool the calendered sheets to room temperature and wind and package them.

[0170] The installation method of the anti-collision strip for the freight elevator is the same as that in Example 1.

[0171] Comparative Example 2

[0172] An anti-collision strip for a freight elevator is basically the same as that in Example 1, and the only difference lies in the preparation method of the soft PVC material.

[0173] The preparation method of the soft PVC material is as follows:

[0174] S1. Mix 3 kg of polyethylene oxide, 2 kg of nylon 66, 0.3 kg of epoxy soybean oil, and 0.02 kg of tris(2-ethylhexyl) phosphate in a premixing equipment for 30 minutes. Subsequently, raise the temperature to 75°C and add 0.02 kg of butylated hydroxyanisole at this temperature, and continue stirring until this component is completely dissolved.

[0175] S2. Next, add 10 kg of PVC resin to the premixing equipment and stir at a speed of 200 revolutions per minute while gradually raising the temperature to 80°C. During this process, sequentially add 0.1 kg of zinc stearate, 0.2 kg of dibutyltin dilaurate, 0.5 kg of kaolin, 0.2 kg of brominated polystyrene, 0.3 kg of sodium bicarbonate, 0.1 kg of stearamide, 0.1 kg of sorbitol, 0.5 kg of di-tert-butyl peroxide, and 0.2 kg of titanium dioxide. Control the flow direction of the materials to ensure uniform mixing and obtain the premixed materials.

[0176] S3. Add the premixed material to the reaction vessel by spraying; subsequently, raise the temperature inside the reaction vessel to 140°C, and transfer the material to the cooling equipment through high-speed stirring at 500 revolutions per minute;

[0177] S4. Take out the material after it is stirred and cooled to room temperature in the cooling equipment; send the cooled material into a planetary extruder and carry out extrusion under temperature control at 140°C; the extruded material enters a calender and is calendered at a temperature of 190°C to form a sheet; finally, cool the calendered sheet to room temperature and carry out winding and packaging.

[0178] The installation method of the anti-collision strip for the freight elevator is the same as that in Embodiment 1.

[0179] Comparative Example 3

[0180] An anti-collision strip for a freight elevator is basically the same as that in Embodiment 1, and the only difference is the preparation method of the soft PVC material.

[0181] The preparation method of the soft PVC material is as follows:

[0182] S1. Mix 3 kg of polyethylene oxide, 2 kg of nylon 66, 0.3 kg of epoxidized soybean oil, and 0.02 kg of tris(2-ethylhexyl) phosphate in a premixing device for 30 minutes; subsequently, raise the temperature to 75°C and add 0.02 kg of butylated hydroxyanisole at this temperature, and continue stirring until this component is completely dissolved;

[0183] S2. Then, add 10 kg of PVC resin to the premixing device and stir at a speed of 200 revolutions per minute, while gradually raising the temperature to 80°C; during this process, sequentially add 0.1 kg of zinc stearate, 0.2 kg of dibutyltin dilaurate, 0.5 kg of talc powder, 0.2 kg of brominated polystyrene, 0.3 kg of sodium bicarbonate, 0.1 kg of stearamide, 0.1 kg of sorbitol, 0.5 kg of di-tert-butyl peroxide, and 0.2 kg of titanium dioxide, control the flow direction of the material to ensure uniform mixing, and obtain the premixed material;

[0184] S3. Add the premixed material to the reaction vessel by spraying; subsequently, raise the temperature inside the reaction vessel to 140°C, and transfer the material to the cooling equipment through high-speed stirring at 500 revolutions per minute;

[0185] S4. Take out the material after it is stirred and cooled to room temperature in the cooling equipment; send the cooled material into a planetary extruder and carry out extrusion under temperature control at 140°C; the extruded material enters a calender and is calendered at a temperature of 190°C to form a sheet; finally, cool the calendered sheet to room temperature and carry out winding and packaging.

[0186] The installation method of the anti-collision strip for the freight elevator is the same as that in Embodiment 1.

[0187] Comparative Example 4

[0188] An anti-collision strip for a freight elevator is basically the same as that in Embodiment 1, and the only difference is the preparation method of the soft PVC material.

[0189] The preparation method of the soft PVC material is as follows:

[0190] S1. Mix 3 kg of polyethylene oxide, 2 kg of nylon 66, 0.3 kg of epoxidized soybean oil, and 0.02 kg of tris(2-ethylhexyl) phosphate in a premixing device for 30 minutes. Then, raise the temperature to 75 °C and add 0.02 kg of butylated hydroxyanisole at this temperature, and continue stirring until this component is completely dissolved.

[0191] S2. Then, add 10 kg of PVC resin to the premixing device and stir at a speed of 200 revolutions per minute, while gradually raising the temperature to 80 °C. During this process, sequentially add 0.1 kg of zinc stearate, 0.2 kg of dibutyltin dilaurate, 0.2 kg of brominated polystyrene, 0.3 kg of sodium bicarbonate, 0.1 kg of stearamide, 0.1 kg of sorbitol, 0.5 kg of di-tert-butyl peroxide, and 0.2 kg of titanium dioxide, control the flow direction of the material to ensure uniform mixing, and obtain a premixed material.

[0192] S3. Add the premixed material to the reaction vessel by spraying. Then, raise the temperature in the reaction vessel to 140 °C and transfer the material to the cooling device by high-speed stirring at 500 revolutions per minute.

[0193] S4. After the material is stirred and cooled to room temperature in the cooling device, take it out. Feed the cooled material into a planetary extruder and extrude it under a temperature control of 140 °C. The extruded material enters a calender and is calendered at a temperature of 190 °C to form a sheet. Finally, cool the calendered sheet to room temperature and wind it up and package it.

[0194] The installation method of the anti-collision strip for the freight elevator is the same as that in Embodiment 1.

[0195] Test Example 1

[0196] Mechanical property test: Determine the tensile properties of the soft PVC material in accordance with GB / T 1040.1-2018 "Plastics - Determination of tensile properties - Part 1: General principles". Test temperature:

[0197] 25 °C; Tensile rate: 50 mm / min. Test three times and take the average value.

[0198] The test results are shown in Table 1.

[0199] Table 1

[0200]

[0201]

[0202] Test Example 2

[0203] Weather resistance test:

[0204] The soft PVC materials prepared in the examples and comparative examples were made into 1-mm soft sheets, and then stamped into dumbbell shapes. They were placed in an artificial aging test machine and aged for 720 h according to GB / T 16422.3-2022 "Plastics - Methods of exposure to laboratory light sources - Part 3: Fluorescent ultraviolet lamps for aging experiments", with UVA-340, 10 h of irradiation, 70 °C, 5 h of condensation, and 40 °C, no spraying, and then tensile strength tests were carried out; the decline rate was calculated.

[0205] Decline rate = (tensile strength 老化前 - tensile strength 老化后 ) / tensile strength 老化前 × 100%

[0206] The test results are shown in Table 2.

[0207] Table 2

[0208]

[0209]

[0210] It can be seen from Test Examples 1 to 2 that the soft PVC material obtained in Example 1 of the present invention has the best mechanical properties and weather resistance.

[0211] The reason why the montmorillonite used in Example 1 shows better mechanical properties and weather resistance than kaolin and talc in the present invention may be that montmorillonite has a unique nano-layered structure. After appropriate calcination and organic modification treatments, this structure can provide more contact area and better interfacial compatibility, thus achieving more effective stress dispersion and enhancement in the PVC matrix. The layered structure of montmorillonite can provide better interlayer slip when stressed, absorb and delay crack propagation, and enhance the toughness of the material. In addition, the high thermal stability and chemical properties of montmorillonite may make it easier to maintain its structural integrity during the PVC processing, and thus provide better weather resistance during long-term use. In contrast, kaolin and talc may have certain limitations in terms of compatibility, layer spacing, and thermal stability, resulting in less effective enhancement of the PVC material than montmorillonite.

[0212] In the present invention, in Example 1, a titanate coupling agent was used to modify montmorillonite. Compared with the aluminate coupling agent used in Example 4 and the silane coupling agent used in Example 5, the resulting flexible PVC material exhibited better mechanical properties and weather resistance. This may be because the titanate coupling agent has high reactivity and better compatibility, and can more effectively form chemical bonds with montmorillonite and the PVC matrix, thereby improving the interfacial adhesion and stress transfer efficiency. These characteristics of the titanate coupling agent contribute to forming a more uniform stress distribution in the material, enhancing the dispersion of montmorillonite, reducing local stress concentration, and thus improving the overall mechanical properties of the material. At the same time, the titanate coupling agent may also help improve the thermal stability and light stability of the material, further enhancing the weather resistance, so that the modified PVC can better maintain its performance during long-term use.

[0213] In the preparation of the modified filler of the present invention, compared with the carbon nanotubes in Example 6 and the graphene in Example 7, the carbon fiber used in Example 1 exhibited more excellent mechanical properties and weather resistance in the prepared flexible PVC material. This difference may stem from the unique structure and surface characteristics of carbon fiber. Carbon fiber has a high aspect ratio and excellent mechanical strength, and can form an effective stress transfer path in the PVC matrix, thereby improving the overall mechanical properties of the material. In addition, the chemical stability and ultraviolet stability of carbon fiber help improve the weather resistance of PVC, enabling it to maintain good physical properties even when exposed to outdoor conditions for a long time. In contrast, although carbon nanotubes and graphene also have excellent mechanical and thermal properties, in the application of the present invention, they may not be able to form the same efficient stress transfer mechanism with the PVC matrix as carbon fiber. This may be due to their dispersion, compatibility with PVC, or interfacial bonding effect in the composite material not being as ideal as that of carbon fiber. Therefore, when used as a modified filler in the present invention, carbon fiber provides better reinforcement effect and weather protection, thus optimizing the comprehensive performance of the flexible PVC material.

Claims

1. An anti-collision strip for a freight elevator, characterized in that, Including: A. An anti-collision strip body (1) made of soft PVC material; B. A bracket (2) for supporting the anti-collision strip body (1); C. The anti-collision strip body (1) is provided with a chamfer, which is convenient for hanging it from the upper end onto the bracket (2); D. The bracket (2) is provided with bolt (3) mounting holes and self-tapping and self-drilling screws (4) for fixing the anti-collision strip body (1); E. When the anti-collision strip body (1) is impacted, the bracket (2) can disperse the impact force to the whole anti-collision strip body (1); The preparation method of the soft PVC material is as follows, by weight: S1. In a premixing device, 2 - 4 parts of polyethylene oxide, 1 - 3 parts of nylon 66, 0.2 - 0.4 parts of epoxidized soybean oil, and 0.01 - 0.03 parts of tris(2-ethylhexyl) phosphate are mixed, and the duration is controlled within 20 - 40 minutes; subsequently, the temperature is raised to 70 - 80 °C, and 0.01 - 0.03 parts of butylated hydroxyanisole are added at this temperature, and stirring continues until this component is completely dissolved; S2. Then, 8 - 12 parts of PVC resin are added to the premixing device, and stirring is carried out at a rotation speed of 100 - 300 revolutions per minute, while the temperature is gradually raised to 70 - 90 °C; during this process, 0.05 - 0.2 parts of zinc stearate, 0.1 - 0.3 parts of dibutyltin dilaurate, 0.4 - 0.6 parts of modified filler, 0.1 - 0.3 parts of brominated polystyrene, 0.2 - 0.4 parts of sodium bicarbonate, 0.05 - 0.2 parts of stearamide, 0.05 - 0.2 parts of sorbitol, 0.4 - 0.6 parts of di-tert-butyl peroxide, and 0.1 - 0.3 parts of inorganic pigment are added in sequence. Control the flow direction of the material to ensure uniform mixing to obtain a premixed material; S3. The premixed material is added to the reaction vessel by spraying; subsequently, the temperature in the reaction vessel is raised to 130 - 150 °C, and through high-speed stirring at 400 - 600 revolutions per minute, the material is transferred to the cooling device; S4. After the material is stirred and cooled to room temperature in the cooling device, it is taken out; the cooled material is fed into a planetary extruder and extruded under a temperature control of 130 - 150 °C; the extruded material enters a calender and is calendered at a temperature of 180 - 200 °C to form a sheet; finally, the calendered sheet is cooled to room temperature and then wound and packaged; The preparation method of the modified filler is as follows, by weight: Z1. After 0.5 - 2 parts of montmorillonite are pulped and desanded; 0.005 - 0.02 parts of potassium chloride and 0.01 - 0.03 parts of magnesium carbonate are added; under the condition of high-speed stirring, heating is carried out, and the heating rate is 4 - 6 °C / min, and the temperature is raised to 800 - 950 °C for treatment for 10 - 30 minutes to obtain calcined montmorillonite; Z2. Cool the calcined montmorillonite to 65 - 75 °C, and respectively add 0.005 - 0.02 parts of titanate coupling agent and 0.005 - 0.02 parts of palmitic acid, and stir for 10 - 30 minutes to obtain a mixture; add the mixture to a high-speed mixer at 50 - 70 °C, add 0.05 - 0.2 parts of methacrylic acid and 0.001 - 0.003 parts of azobisisobutyronitrile, and stir for 2 - 4 hours; raise the temperature of the mixer to 120 - 140 °C, and stir at high speed for 1 - 3 hours to obtain pretreated montmorillonite; Z3. Dissolve 0.1 - 0.3 parts of sodium lauryl sulfate and 0.01 - 0.03 parts of 2,4,6 - trihydroxybenzoic acid in 0.8 - 1.2 parts of polyphosphoric acid, and react at 180 - 220 °C for 4 - 6 hours; cool to room temperature, wash with acetone, filter, and dry at 80 - 120 °C for 5 - 15 hours to obtain a grafting agent; Z4. Mix 0.8 - 1.2 parts of pretreated montmorillonite with 0.2 - 0.4 parts of grafting agent and 0.005 - 0.02 parts of carbon fiber in a high-speed mixer at 80 - 120 °C for 1 - 3 hours, and cool to room temperature to obtain a modified filler.

2. The anti-collision strip for a freight elevator according to claim 1, characterized in that, The bracket (2) is of an integral rigid structure and can disperse the impact force to the entire anti-collision strip body (1) when being impacted.

3. The anti-collision strip for a freight elevator according to claim 1, characterized in that, The outer surface of the anti-collision strip body (1) has no screw holes to keep the overall appearance clean and beautiful.

4. The anti-collision strip for the freight elevator according to claim 1, characterized in that, The bracket (2) is made of galvanized sheet with a thickness of 1 - 3 mm.

5. The anti-collision strip for a freight elevator according to claim 1, characterized in that, The inorganic pigment is at least one of titanium dioxide, iron oxide red, chromium oxide green, and silica white.

6. A method for installing an anti-collision strip for a freight elevator according to any one of claims 1 to 5, characterized in that, It includes the following steps: (1) Fix the bracket (2) with bolts (3); (2) Hang the anti-collision strip body (1) from the upper end down to the bracket (2); (3) Tighten the self-tapping and self-drilling screws (4) to fix the anti-collision strip body (1); (4) When an impact occurs, disperse the impact force to the entire anti-collision strip body (1) through the bracket (2).

7. An application of a bumper for a freight elevator according to any one of claims 1 to 5, characterized in that, Provide protection on the car wall of the freight elevator to reduce the possible impact damage to the elevator wall during the goods transportation process and improve the operation safety.

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