Automobile door anti-scratch strip and processing method thereof

Abstract

This application relates to the technical field of automotive parts, and more particularly to an automotive door anti-scuff strip and its processing method, comprising a substrate layer, a functional layer, a surface treatment structure, and a transition bonding layer. The processing method optimizes material selection and structural design through processes such as co-extrusion molding, high-pressure spraying, dip coating, and hot pressing, significantly improving the durability and functionality of the anti-scuff strip. This application can effectively reduce the coefficient of friction, enhance sealing performance, and achieve self-repair and anti-aging functions, extending service life while also improving mechanical strength and surface protection capabilities.

Description

Technical Field

[0001] The present application relates to the technical field of automobile parts, and in particular to an automobile door anti-scratch strip and a processing method thereof. Background Art

[0002] Door scuff strips are a crucial component in the automotive industry, enhancing the sealing and protective properties of vehicle doors. Their structural design and processing methods have garnered widespread attention. In practical applications, they must combine low friction with high sealing performance and excellent durability to meet the high-performance and reliability demands of modern vehicles. However, existing door scuff strips still have limitations in terms of material selection, molding processes, and functional design. For example, a single material often struggles to achieve both wear resistance and elasticity. Traditional single-layer extrusion molding techniques can compromise the overall sealing performance of the scuff strip. Furthermore, there is room for improvement in surface treatment technology and the integration of additional functionalities.

[0003] Some existing anti-scuff strips may experience an increase in friction coefficient or a decrease in sealing performance after long-term use, posing challenges to their service life and performance stability. These issues indicate that existing technical solutions for door anti-scuff strips still have room for improvement in terms of material optimization, surface treatment, functional design, and integrated molding processes. Summary of the Invention

[0004] The present invention provides an automobile door anti-scuff strip and a processing method thereof. By optimizing material selection, structural design and surface treatment process, the problems in the prior art of increased friction coefficient or decreased sealing performance of the anti-scuff strip after long-term use are solved, thereby improving the durability and functionality of the door anti-scuff strip.

[0005] In a first aspect, a method for processing an anti-scratch strip for an automobile door is provided, the method comprising the following steps:

[0006] First, the polyurethane foam material is extruded through the first extruder to form the base layer, while the modified polyethylene material is extruded through the second extruder to form the functional layer. The two layers of material are simultaneously formed in a co-extrusion die and combined through a hot pressing process;

[0007] Secondly, a high-pressure spraying process is performed on the surface of the functional layer to embed silica particles to form a particle embedding layer, wherein the spraying pressure of the high-pressure spraying process is 0.5 MPa to 0.8 MPa, the spraying angle is 45 degrees to 60 degrees, and the spraying distance is 10 cm to 15 cm;

[0008] Next, a fluorocarbon resin protective coating is applied to the particle embedded layer by a dip coating process. The fluorocarbon resin protective coating is doped with titanium oxide nanoparticles. The average particle size of the titanium oxide nanoparticles is 20 nanometers to 50 nanometers, and the doping ratio is 1% to 5% of the mass of the fluorocarbon resin. The solid content of the fluorocarbon resin solution in the dip coating process is 30% to 40%, the dip coating speed is 5 mm / s to 10 mm / s, the curing temperature is 120 degrees Celsius to 150 degrees Celsius, and the curing time is 10 minutes to 15 minutes.

[0009] Subsequently, a porous fiber mesh is inserted into the central area of ​​the substrate layer and fixed by a hot pressing process, wherein the porous fiber mesh has a porosity of 70% to 80%, a thickness of the porous fiber mesh ranges from 0.5 mm to 1 mm, a fiber diameter of 10 μm to 30 μm, and a density of the fiber mesh ranges from 0.2 g / cm3 to 0.5 g / cm3;

[0010] Finally, the anti-scratch strip is subjected to surface post-treatment, including two steps: plasma cleaning and UV curing. Plasma cleaning uses a mixed gas of oxygen and argon with a gas flow ratio of 1:2 and a cleaning time of 30 to 60 seconds. UV curing uses an ultraviolet light source with a wavelength of 365 nanometers, an irradiation intensity of 800 to 1200 milliwatts per square centimeter, and an irradiation time of 5 to 10 seconds.

[0011] In this embodiment, the substrate layer and functional layer are combined through a co-extrusion process. Silicon dioxide particles are introduced onto the surface of the functional layer and a fluorocarbon resin protective coating is applied. This significantly enhances the low-friction and durability of the anti-scuff strip. Furthermore, the high porosity and micron-scale pore size of the porous fiber mesh effectively absorbs sound wave energy, reducing noise transmission.

[0012] In some possible implementations, the substrate layer is composed of a polyurethane foam material, and contains a plurality of closed bubble structures uniformly distributed along the thickness direction. The bubble diameter gradually decreases from the inside to the outside, and the bubble diameter ranges from 0.1 mm to 1 mm; the functional layer is arranged on the outside of the substrate layer, and is composed of a modified polyethylene material, and nano-scale talc particles are added, and the average particle size of the talc particles is 50 nanometers to 100 nanometers; a transition bonding layer is provided between the substrate layer and the functional layer, and the transition bonding layer is composed of a thermoplastic elastomer material, and the hardness of the thermoplastic elastomer material ranges from Shore A50 to Shore A80.

[0013] In the embodiments of the present invention, the closed-cell structure of the substrate layer effectively reduces material density while maintaining good elasticity and cushioning properties. The addition of nano-sized talc particles to the functional layer further reduces the surface friction coefficient, while the introduction of a transitional bonding layer strengthens the bond between the substrate and functional layers, preventing delamination over time.

[0014] In combination with the first aspect, in certain implementations of the first aspect, microcapsules are dispersed in the outer area of ​​the substrate layer, the wall material of the microcapsules is polyurea-formaldehyde resin, the core material is a silicone repair agent, and the average particle size of the microcapsules is 10 microns to 50 microns; the silica particles are embedded in the surface of the functional layer through a high-pressure spraying process to form a regularly arranged protrusion structure, the height of the protrusion structure ranges from 0.05 mm to 0.2 mm, and the spacing between adjacent protrusions is 0.1 mm to 0.3 mm; the protective coating is coated on the particle embedding layer through a dip coating process, and the thickness of the protective coating ranges from 10-30 microns.

[0015] In this embodiment of the present invention, the microcapsule design enables the self-healing function of the anti-scuff strip. When microcracks appear on the surface of the anti-scuff strip, the microcapsules rupture and release a repair agent to fill the cracked area. The raised structure formed by the silica particles on the surface of the functional layer effectively reduces the contact area, further reducing the coefficient of friction, while the protective coating provides additional weather resistance and aging resistance.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the transition bonding layer is formed simultaneously with the substrate layer and the functional layer through a co-extrusion process, and is further enhanced in bonding strength through a hot pressing process after forming, wherein the temperature range of the hot pressing process is 120 degrees Celsius to 150 degrees Celsius, the pressure range is 0.2 MPa to 0.5 MPa, and the holding time is 5 minutes to 10 minutes.

[0017] In the embodiments of the present invention, the inclusion of a porous fiber mesh not only enhances the mechanical strength of the substrate layer but also improves the shock absorption performance of the anti-scuff strip through its high porosity. The parameters of the hot-pressing process ensure a tight bond between the porous fiber mesh and the substrate layer, while the inclusion of titanium oxide nanoparticles in the fluorocarbon resin protective coating imparts a certain degree of self-cleaning capability to the anti-scuff strip.

[0018] In combination with the first aspect, in certain implementations of the first aspect, the thickness range of the substrate layer is 2-5 mm, the thickness range of the functional layer is 0.5-1 mm, and the thickness range of the transition bonding layer is 0.1-0.3 mm; during the plasma cleaning process, the total flow rate range of oxygen and argon is 100-200 standard milliliters per minute, and the pressure range of the cleaning chamber is 50-100 Pa; the power range of the UV curing light source is 100-200 watts, and the distance range between the light source and the surface of the anti-scratch strip is 5-15 cm.

[0019] In this embodiment of the present invention, the thicknesses of the substrate layer, functional layer, and transition bonding layer have been precisely optimized to ensure the overall strength of the anti-scuff strip while avoiding material waste due to excessive thickness. The process parameters for plasma cleaning and UV curing further enhance the surface cleanliness and coating adhesion of the anti-scuff strip.

[0020] In a second aspect, the present invention provides an automobile door anti-scratch strip, comprising a substrate layer, a functional layer, a surface treatment structure and a transition bonding layer; wherein the substrate layer is composed of a polyurethane foam material; the functional layer is composed of a modified polyethylene material; the surface treatment structure includes a particle embedding layer and a protective coating; and the transition bonding layer is composed of a thermoplastic elastomer material.

[0021] In conjunction with the second aspect, in certain implementations of the second aspect, the anti-scuff strip is installed using a snap-on connection. Multiple sets of elastic snaps are provided on the back of the anti-scuff strip, with each set of snaps spaced 50-100 mm apart, 1-2 mm thick, and 3-5 mm wide. A corresponding slot is provided on the door frame, with a depth of 2-3 mm and a width of 4-6 mm. The clearance between the snap and slot is 0.1-0.2 mm, ensuring quick installation and stable stability of the anti-scuff strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the overall structure of the automobile door anti-scratch strip processing process of the present invention.

[0023] Figure 2 The figure is a partial structural diagram of the processing process of the automobile door anti-scratch strip of the present invention.

[0024] Figure 3 Schematic diagram of the overall structure of the functional layer and silica particles in the present invention.

[0025] Figure 4 It is a structural schematic diagram of the snap-on installation method of the anti-scratch strip of the present invention.

[0026] Figure 5 The figure is a schematic structural diagram of the anti-scratch strip for automobile doors according to the present invention.

[0027] Icons: 1. Substrate layer; 2. Functional layer; 3. Surface treatment structure; 4. Transition bonding layer; 5. Silica particles; 6. Elastic buckle; 7. Slot. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] See Figure 1-Figure 5 As shown, the present invention provides an automobile door anti-scratch strip and a processing method thereof, and describes the specific embodiments of the present invention in detail.

[0032] First, the car door anti-scratch strip includes a substrate layer 1, a functional layer 2, a surface treatment structure 3 and a transition bonding layer 4. Figure 5 As shown. The substrate layer 1 is formed by an extrusion process of a polyurethane foam material. The substrate layer 1 is composed of a polyurethane foam material, and its interior contains a plurality of closed bubble structures uniformly distributed along the thickness direction. The diameter of the closed bubble structure gradually decreases from the inside to the outside, and the bubble diameter ranges from 0.1 mm to 1 mm. This gradient density design gives the substrate layer 1 good elasticity and recovery ability. The thickness of the substrate layer 1 ranges from 2 mm to 5 mm, and microcapsules are dispersed in its outer area. The wall material of the microcapsules is polyurea-formaldehyde resin, and the core material is a silicone repair agent. The average particle size of the microcapsules is 10 microns to 50 microns, and the distribution density is 100 to 300 per cubic millimeter. The microcapsules are uniformly dispersed in the outer area of ​​the substrate layer 1 through an electrostatic spraying process. The spraying voltage of the electrostatic spraying process is 20 kV to 50 kV, the spraying distance is 10 cm to 15 cm, and the spraying time is 5 seconds to 10 seconds. The microcapsule wall material undergoes a modified treatment to enhance mechanical strength and heat resistance. This treatment employs an epoxy resin coating with a thickness of 1 to 3 microns. The outer region of substrate layer 1 undergoes a UV curing treatment to enhance the adhesion of the microcapsules. This UV curing utilizes a UV light source with a wavelength of 365 nanometers, an irradiation intensity of 800 to 1200 milliwatts per square centimeter, and an irradiation time of 5 to 10 seconds.

[0033] The functional layer 2 is arranged on the outside of the substrate layer 1 and is composed of a modified polyethylene material and nano-scale talc particles. The average particle size of the talc particles is 50 nanometers to 100 nanometers. The thickness of the functional layer 2 ranges from 0.5 mm to 1 mm. The surface treatment structure 3 is attached to the outer surface of the functional layer 2 and includes a particle embedding layer and a protective coating. The surface of the functional layer 2 is embedded with silica particles 5 through a high-pressure spraying process to form a regularly arranged protrusion structure, such as Figure 3 As shown. The height of the raised structures ranges from 0.05 mm to 0.2 mm, and the spacing between adjacent raised structures ranges from 0.1 mm to 0.3 mm. The spraying pressure of the high-pressure spraying process is 0.5 MPa to 0.8 MPa, the spraying angle is 45 degrees to 60 degrees, and the spraying distance is 10 cm to 15 cm. A fluorocarbon resin protective coating is applied to the surface of the functional layer 2, and the thickness of the protective coating ranges from 10 microns to 30 microns. The fluorocarbon resin protective coating is applied to the particle embedding layer by a dip coating process. The solid content of the fluorocarbon resin solution in the dip coating process is 30% to 40%, the dip coating speed is 5 mm / s to 10 mm / s, the curing temperature is 120 degrees Celsius to 150 degrees Celsius, and the curing time is 10 minutes to 15 minutes. The fluorocarbon resin protective coating is doped with titanium oxide nanoparticles, the average particle size of the titanium oxide nanoparticles is 20 nanometers to 50 nanometers, and the doping ratio is 1% to 5% of the mass of the fluorocarbon resin.

[0034] A transition bonding layer 4 is provided between the substrate layer 1 and the functional layer 2. This layer is composed of a thermoplastic elastomer material with a hardness ranging from Shore A50 to Shore A80. The transition bonding layer 4 is co-extruded with the substrate layer 1 and the functional layer 2, and then undergoes a post-molding hot pressing process to further enhance the bonding strength. The hot pressing process is performed at a temperature of 120°C to 150°C, a pressure of 0.2 MPa to 0.5 MPa, and a dwell time of 5 to 10 minutes. The transition bonding layer 4 has a thickness ranging from 0.1 mm to 0.3 mm and is uniformly dispersed with nano-sized zinc oxide particles. The average particle size of the zinc oxide particles is 30 nm to 80 nm, and the doping ratio is 0.5% to 2% of the mass of the transition bonding layer 4. The surface of the transition bonding layer 4 is plasma treated to improve the interface bonding performance. The plasma treatment uses a mixed gas of oxygen and argon with a gas flow ratio of 1:2, a treatment time of 30 seconds to 60 seconds, and a pressure range of 50 Pa to 100 Pa in the treatment chamber.

[0035] The porous fiber mesh is embedded in the central area of ​​the substrate layer 1. The porosity of the porous fiber mesh is 70% to 80%, the thickness range is 0.5 mm to 1 mm, the fiber diameter is 10 microns to 30 microns, and the density range of the fiber mesh is 0.2 grams per cubic centimeter to 0.5 grams per cubic centimeter. The porous fiber mesh is fixed to the central area of ​​the substrate layer 1 by a hot pressing process. The temperature range of the hot pressing process is 120 degrees Celsius to 150 degrees Celsius, the pressure range is 0.2 MPa to 0.5 MPa, and the holding time is 5 minutes to 10 minutes. The surface of the porous fiber mesh is chemically treated to enhance the bonding strength with the substrate layer 1. The chemical treatment uses a silane coupling agent solution with a solution concentration of 1% to 5% and a treatment time of 10 minutes to 20 minutes. The high porosity and micron-scale pore size of the porous fiber mesh can effectively absorb sound wave energy and reduce the propagation of noise. Embedded within the porous fiber mesh is microcapsule technology. The microcapsules' walls are made of polyurea-formaldehyde resin, and their core is a silicone-based repair agent. The average particle size of the microcapsules ranges from 10 to 50 microns, with a density of 100 to 300 per cubic millimeter. When the surface of the anti-scratch strip is even slightly scratched, the microcapsules rupture, releasing the repair agent. This agent reacts with moisture in the air to form an elastic membrane, thus filling the damaged area.

[0036] Post-treatment of the anti-scuff strip surface consists of two steps: plasma cleaning and UV curing. Plasma cleaning uses a mixture of oxygen and argon with a gas flow ratio of 1:2, a total flow rate ranging from 100 standard milliliters per minute to 200 standard milliliters per minute, a cleaning time of 30 to 60 seconds, and a cleaning chamber pressure range of 50 to 100 Pa. UV curing uses a UV light source with a wavelength of 365 nanometers, an irradiation intensity of 800 to 1200 milliwatts per square centimeter, an irradiation time of 5 to 10 seconds, a light source power range of 100 to 200 watts, and a distance between the light source and the anti-scuff strip surface ranging from 5 to 15 cm.

[0037] In the actual production process, the polyurethane foam material is first extruded through the first extruder to form the substrate layer 1, such as Figure 1 and Figure 2As shown. The thickness of the substrate layer 1 ranges from 2 mm to 5 mm, and the width is adjusted according to the size of the vehicle door. Multiple groups of elastic clips 6 are provided on the back of the substrate layer 1, with the spacing between each group of clips being 50-100 mm, the clip thickness being 1-2 mm, and the width being 3-5 mm. The elastic clips 6 are integrally formed with the substrate layer 1 through an injection molding process, with an injection molding temperature of 220-240 degrees Celsius, an injection molding pressure of 80-100 MPa, and a holding time of 10-15 seconds. Simultaneously, the modified polyethylene material is extruded through a second extruder to form the functional layer 2, with the extrusion speed being consistent with that of the first extruder to ensure that the two layers of material are molded simultaneously. The thickness of the functional layer 2 ranges from 0.5 mm to 1 mm, and the width is the same as that of the substrate layer 1. The two layers of material are simultaneously molded in a co-extrusion mold and combined through a hot pressing process. A surface treatment structure 3 is attached to the outer surface of the functional layer 2, including a particle embedding layer and a protective coating. Subsequently, a high-pressure spraying process is performed on the surface of the functional layer 2 to embed silica particles 5 to form a particle embedding layer. Next, a fluorocarbon resin protective coating is applied on the particle embedding layer by a dip coating process. Then, a porous fiber mesh is inserted into the central area of ​​the substrate layer 1 and fixed by a hot pressing process. A transition bonding layer 4 is provided between the functional layer 2 and the substrate layer 1. The bonding layer is composed of a thermoplastic elastomer material and has a thickness of 0.1 mm to 0.3 mm. The transition bonding layer 4 is tightly bonded to the substrate layer 1 and the functional layer 2 by a mold hot pressing process. Finally, the surface of the anti-scratch strip is post-treated, specifically including two steps of plasma cleaning and ultraviolet curing. Through the above process, a close fit between the substrate layer 1, the functional layer 2, the surface treatment structure 3 and the transition bonding layer 4 is achieved, ensuring the stability and reliability of the anti-scratch strip in long-term use.

[0038] The anti-scratch strip is installed in a snap-on connection. The details of the elastic snap 6 and the slot 7 are as follows: Figure 4 As shown. A corresponding slot 7 is provided on the door frame, with a depth of 2-3 mm and a width of 4-6 mm. The clearance between the elastic clip 6 and the slot 7 is 0.1-0.2 mm, ensuring quick and stable installation of the anti-scuff strip. During installation, align the elastic clip 6 with the slot 7 and apply appropriate pressure to fully engage the clip. After installation, the anti-scuff strip fits snugly against the door frame, preventing it from loosening or falling off.

[0039] In order to better enable relevant personnel in this technical field to fully understand and implement the present invention, the specific implementation principle of the present invention is further supplemented below with reference to a specific application scenario.

[0040] In actual applications, the processing of automotive door anti-scuff strips can be broken down into several key steps, each of which focuses on improving its low-friction characteristics, sealing performance, and durability. First, the polyurethane foam material is extruded through the first extruder to form the base layer 1, while the modified polyethylene material is extruded through the second extruder to form the functional layer 2. The two layers of material are simultaneously formed in a co-extrusion mold and combined through a hot pressing process. During this process, the closed cell structure inside the base layer 1 has the effect of reducing density while maintaining good elasticity and cushioning properties. Because the diameter of the closed cell structure gradually decreases from the inside to the outside, this design effectively disperses the stress concentration within the material, thereby improving the overall deformation resistance.

[0041] Subsequently, a high-pressure spraying process is carried out on the surface of the functional layer 2 to embed silica particles 5 to form a regularly arranged raised structure. The parameter settings of the high-pressure spraying process, such as the spraying pressure of 0.5 MPa to 0.8 MPa, the spraying angle of 45 degrees to 60 degrees, and the spraying distance of 10 cm to 15 cm, ensure that the silica particles 5 can be evenly distributed on the surface of the functional layer 2. The height of these raised structures ranges from 0.05 mm to 0.2 mm, and the spacing between adjacent raised structures is 0.1 mm to 0.3 mm, which significantly reduces the contact area and thus reduces the friction coefficient. In addition, a fluorocarbon resin protective coating is applied to the surface of the functional layer 2 through a dip coating process, further enhancing the weather resistance and aging resistance of the anti-scratch strip. The titanium oxide nanoparticles doped in the fluorocarbon resin protective coating give the anti-scratch strip a certain self-cleaning ability. This is because the titanium oxide nanoparticles have photocatalytic activity under light and can decompose organic pollutants attached to the surface.

[0042] Next, a porous fiber mesh is inserted into the central area of ​​the substrate layer 1 and fixed by a hot pressing process. The porosity of the porous fiber mesh is 70% to 80%, the thickness range is 0.5 mm to 1 mm, the fiber diameter is 10 microns to 30 microns, and the density of the fiber mesh ranges from 0.2 grams per cubic centimeter to 0.5 grams per cubic centimeter. The temperature range of the hot pressing process is 120 degrees Celsius to 150 degrees Celsius, the pressure range is 0.2 MPa to 0.5 MPa, and the holding time is 5 minutes to 10 minutes. The precise control of these parameters ensures that the porous fiber mesh is tightly combined with the substrate layer 1. At the same time, the high porosity characteristics of the porous fiber mesh improve the shock absorption performance of the anti-scratch strip. The microcapsules embedded in the porous fiber mesh further enhance the self-repairing ability of the anti-scratch strip. When microcracks appear on the surface of the anti-scratch strip, the microcapsules rupture and release silicone repair agents to fill the cracked area, thereby extending the service life of the anti-scratch strip.

[0043] Finally, the surface of the anti-scratch strip is post-treated, including two steps: plasma cleaning and UV curing. Plasma cleaning uses a mixed gas of oxygen and argon with a gas flow ratio of 1:2, a total flow range of 100 standard milliliters per minute to 200 standard milliliters per minute, a cleaning time of 30 seconds to 60 seconds, and a pressure range of 50 Pa to 100 Pa in the cleaning chamber. Plasma cleaning removes impurities and oil stains on the surface of the anti-scratch strip and improves the adhesion of the coating. UV curing uses a UV light source with a wavelength of 365 nanometers, an irradiation intensity of 800 milliwatts per square centimeter to 1200 milliwatts per square centimeter, an irradiation time of 5 seconds to 10 seconds, a light source power range of 100 watts to 200 watts, and a distance between the light source and the surface of the anti-scratch strip of 5 cm to 15 cm. UV curing further enhances the bonding between the protective coating and the functional layer 2, thereby improving the overall performance of the anti-scratch strip.

[0044] The close coordination of these process steps achieves a synergistic effect among the substrate layer 1, functional layer 2, surface treatment structure 3, and transition bonding layer 4, ensuring the long-term stability and reliability of the scuff strip. For example, during the frequent opening and closing of a car door, the scuff strip effectively reduces friction while maintaining a good seal, preventing dust and moisture from entering the vehicle interior. Furthermore, the scuff strip's self-healing and weather-resistant properties significantly extend its service life, meeting the high-performance and reliability demands of modern vehicles.

[0045] In actual application, when the anti-scratch strip needs to be installed on the door frame, the matching accuracy of the elastic buckle 6 and the slot 7 must be ensured first. Figure 4 As shown, the thickness of the elastic buckle 6 is 1-2 mm, the width is 3-5 mm, and the spacing between each group of buckles is 50-100 mm, while the depth of the card slot 7 is 2-3 mm and the width is 4-6 mm. By controlling the fitting clearance between the elastic buckle 6 and the card slot 7 to 0.1-0.2 mm, it can be ensured that the anti-scratch strip can be quickly embedded during the installation process and can maintain a stable fit during subsequent use. During installation, the operator aligns the elastic buckle 6 with the card slot 7 and applies appropriate pressure to completely embed the buckle in the card slot. Since the elastic buckle 6 is integrally formed with the base material layer 1 by an injection molding process, its material has good elastic deformation ability. Therefore, when pressure is applied, the buckle can undergo a slight deformation to adapt to the shape of the card slot 7, thereby achieving a tight fit. After installation, the anti-scratch strip fits tightly against the door frame to avoid a decrease in sealing performance due to loosening or falling off.

[0046] During the use of the anti-scratch strip, the low friction characteristics of the functional layer 2 play a key role. The functional layer 2 is made of modified polyethylene material, and nano-scale talc particles are added during the extrusion process. These talc particles are evenly distributed inside the functional layer 2, effectively reducing the overall friction coefficient of the material. When the door glass contacts the functional layer 2 and produces relative sliding, the flexibility of the modified polyethylene material combined with the lubricating effect of the talc particles significantly reduces the frictional resistance between the two. In addition, the particle embedding layer on the surface of the functional layer 2 further optimizes the friction characteristics. The silica particles 5 are embedded in the surface of the functional layer 2 through a high-pressure spraying process to form a regularly arranged raised structure. This surface texture design not only increases the roughness of the functional layer 2, but also fixes the silica particles 5 by physical embedding, making it less likely to fall off during long-term use. When the door glass slides, these raised structures can disperse the contact stress, thereby further reducing the friction coefficient and increasing the service life of the anti-scratch strip.

[0047] The sealing performance of the anti-scratch strip mainly depends on the gradient density design of the substrate layer 1 and the interface bonding strength of the transition bonding layer 4. The substrate layer 1 is extruded from a polyurethane foam material and contains a plurality of closed bubble structures inside. These bubbles are evenly distributed along the thickness direction and form a gradient density design. When the anti-scratch strip is subjected to external pressure, the highly elastic material of the substrate layer 1 can quickly deform to fill the gap between the door and the frame. At the same time, the closed bubble structure inside it provides good recovery ability, ensuring that the anti-scratch strip can still maintain its sealing performance after multiple compressions. In addition, the transition bonding layer 4 is made of a thermoplastic elastomer material and is tightly bonded to the substrate layer 1 and the functional layer 2 through a mold hot pressing molding process. During the hot pressing process, the mold surface is plasma cleaned to remove residual impurities and improve the interface bonding strength. This integrated structural design forms a firm connection between the substrate layer 1 and the functional layer 2, avoiding the problem of reduced sealing performance due to interface peeling.

[0048] The weather resistance and damage resistance of the anti-scratch strip are achieved through the surface treatment structure 3 and the self-repair functional module. In the high-pressure spraying process, the spraying pressure is set to 0.5-0.8 MPa, the spraying angle is 45-60 degrees, and the spraying distance is 10-15 cm to ensure that the silica particles 5 are evenly embedded in the surface of the functional layer 2. Subsequently, a fluorocarbon resin protective coating is applied to the particle embedding layer through a dip coating process, with a curing temperature of 120-150 degrees Celsius and a curing time of 10-15 minutes. The fluorocarbon resin coating is doped with titanium oxide nanoparticles to enhance the coating's UV resistance and surface hardness. When the anti-scratch strip is exposed to harsh environments, the fluorocarbon resin coating can effectively resist the erosion of ultraviolet rays, rain and dust, thereby extending the service life of the anti-scratch strip. In addition, microcapsules are evenly dispersed in the outer area of ​​the substrate layer 1, the wall material is polyurea-formaldehyde resin, and the core material is a silicone repair agent. When the surface of the anti-scratch strip is slightly scratched, the microcapsules rupture to release the repair agent, which reacts with moisture in the air to form an elastic film, thereby filling the damaged area and restoring the integrity and functionality of the anti-scratch strip.

[0049] The porous fiber mesh integrated within the scuff strip plays a crucial role in acoustic absorption. Filling the central area of ​​substrate layer 1, this porous fiber mesh features a porosity of 70%-80% and fiber diameters ranging from 10 to 30 microns. When the door is closed, external noise is transmitted through the door gap to the scuff strip. The porous fiber mesh's high porosity and micron-scale pore size effectively absorb sound wave energy, reducing noise transmission. This integrated structural design not only improves the scuff strip's acoustic performance but also avoids the complexity associated with additional components.

[0050] In summary, the present invention achieves comprehensive improvements in sealing performance, friction characteristics, and service life for scuff strips through the gradient density design of substrate layer 1, the low-friction properties of functional layer 2, the optimized weather resistance of surface treatment structure 3, and the damage resistance of the self-repairing functional module. Furthermore, the snap-on installation method ensures rapid assembly and long-term stability of the scuff strip, meeting the demand for high-performance door scuff strips in modern vehicles.

[0051] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for processing an automobile door anti-scratch strip, characterized in that: The method comprises the following steps: A polyurethane foam material is extruded through a first extruder to form a base material layer (1), and a modified polyethylene material is extruded through a second extruder to form a functional layer (2), and the two layers of material are simultaneously formed in a co-extrusion die and combined through a hot pressing process; Performing a high-pressure spraying process on the surface of the functional layer (2) to embed silica particles (5) to form a particle embedding layer, wherein the spraying pressure of the high-pressure spraying process is 0.5 MPa to 0.8 MPa, the spraying angle is 45 degrees to 60 degrees, and the spraying distance is 10 cm to 15 cm; A fluorocarbon resin protective coating is applied to the particle embedding layer by a dip coating process, wherein the fluorocarbon resin protective coating is doped with titanium oxide nanoparticles, wherein the average particle size of the titanium oxide nanoparticles is 20 nanometers to 50 nanometers, and the doping ratio is 1% to 5% by mass of the fluorocarbon resin. The solid content of the fluorocarbon resin solution in the dip coating process is 30% to 40%, the dip coating speed is 5 mm / s to 10 mm / s, the curing temperature is 120 degrees Celsius to 150 degrees Celsius, and the curing time is 10 minutes to 15 minutes; Inserting a porous fiber mesh into the central area of ​​the substrate layer (1) and fixing it by a hot pressing process, wherein the porous fiber mesh has a porosity of 70% to 80%, a thickness of the porous fiber mesh in the range of 0.5 mm to 1 mm, a fiber diameter of 10 μm to 30 μm, and a density of the fiber mesh in the range of 0.2 g / cm3 to 0.5 g / cm3; The anti-scratch strip is surface treated, including two steps: plasma cleaning and ultraviolet curing. The plasma cleaning uses a mixed gas of oxygen and argon with a gas flow ratio of 1:2 and a cleaning time of 30 seconds to 60 seconds. The ultraviolet curing uses an ultraviolet light source with a wavelength of 365 nanometers, an irradiation intensity of 800 milliwatts per square centimeter to 1200 milliwatts per square centimeter, and an irradiation time of 5 seconds to 10 seconds. The functional layer (2) is arranged on the outer side of the substrate layer (1), and is composed of a modified polyethylene material and added with nano-scale talc powder particles, wherein the average particle size of the talc powder particles is 50 nanometers to 100 nanometers; a transition bonding layer (4) is arranged between the substrate layer (1) and the functional layer (2), and the transition bonding layer (4) is composed of a thermoplastic elastomer material, and the hardness of the thermoplastic elastomer material ranges from Shore A50 to Shore A80; the transition bonding layer (4) is formed synchronously with the substrate layer (1) and the functional layer (2) through a co-extrusion process, and is further enhanced in bonding strength by a hot pressing process after forming, wherein the temperature range of the hot pressing process is 120 degrees Celsius to 150 degrees Celsius, the pressure range is 0.2 MPa to 0.5 MPa, and the holding time is 5 minutes to 10 minutes.

2. The method for processing an automobile door anti-scratch strip according to claim 1, characterized in that: The substrate layer (1) is made of polyurethane foam material, and contains a plurality of closed bubble structures uniformly distributed along the thickness direction. The bubble diameter gradually decreases from the inside to the outside, and the bubble diameter ranges from 0.1 mm to 1 mm.

3. The method for processing an automobile door anti-scratch strip according to claim 1, characterized in that: Microcapsules are dispersed in the outer area of ​​the substrate layer (1), the wall material of the microcapsules is polyurea-formaldehyde resin, the core material is a silicone repair agent, and the average particle size of the microcapsules is 10 microns to 50 microns.

4. The method for processing an automobile door anti-scratch strip according to claim 3, characterized in that: The silicon dioxide particles (5) are embedded in the surface of the functional layer (2) through a high-pressure spraying process to form a regularly arranged convex structure, the height of the convex structure ranges from 0.05 mm to 0.2 mm, and the spacing between adjacent convex structures ranges from 0.1 mm to 0.3 mm.

5. An automobile door anti-scratch strip, comprising a substrate layer (1), a functional layer (2), a surface treatment structure (3) and a transition bonding layer (4), characterized in that: The automobile door anti-scratch strip is manufactured by the processing method of the automobile door anti-scratch strip according to any one of claims 1 to 4; The substrate layer (1) is composed of polyurethane foam material; The functional layer (2) is made of modified polyethylene material; The surface treatment structure (3) includes a particle embedding layer and a protective coating; The transition bonding layer (4) is made of thermoplastic elastomer material.

6. The automobile door anti-scratch strip according to claim 5, characterized in that: The thickness of the substrate layer (1) ranges from 2 mm to 5 mm, the thickness of the functional layer (2) ranges from 0.5 mm to 1 mm, and the thickness of the transition bonding layer (4) ranges from 0.1 mm to 0.3 mm.

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