Production method and system of high-sound-absorption-coefficient multi-layer composite automobile interior sound insulation material

Abstract

The invention provides a production method and system of a high-sound-absorption-coefficient multi-layer composite automobile interior sound insulation material, and relates to the technical field of automobile production. Comprising the following steps: high-frequency vibration screening, plasma surface activation, hot air laying, ultrasonic needling, nano titanium dioxide solution dipping and microwave drying to prepare the high-sound-absorption-coefficient multi-layer composite automotive interior sound insulation material. Wherein an inclined through hole channel with an included angle of 60-75 degrees with the surface and a spiral microcosmic rough structure of the inner wall of the hole channel are formed on the fiber web layer through ultrasonic needling, and a nanometer titanium dioxide adsorption layer (with the anatase phase content gt, 95 wt%) is formed on the surface of the fiber web layer. The average sound absorption coefficient of the prepared sound insulation material in the frequency range of 250-2000 Hz is larger than 0.85, the heat conductivity coefficient of the sound insulation material is smaller than 0.035 W / (m.K), and the sound insulation material has excellent sound absorption and heat insulation performance.

Description

Technical Field

[0001] The invention relates to automobile production technology, and in particular to a production method and system for a multi-layer composite automobile interior sound insulation material with a high sound absorption coefficient. Background Art

[0002] Automotive interior sound insulation materials are crucial to improving the vehicle's NVH (noise, vibration and harshness) performance and creating a comfortable driving environment. Traditional automotive interior sound insulation materials usually use a single material, such as polyurethane foam, felt, etc. These materials have good sound absorption performance in certain frequency bands, but the overall sound absorption coefficient is not high, especially in the mid- and high-frequency bands. The sound absorption performance is poor, which makes it difficult to meet the growing demand for vehicle quietness.

[0003] The prior art has the following defects and deficiencies: 1. Traditional sound insulation materials have a low sound absorption coefficient, especially in the mid- and high-frequency bands, and are difficult to effectively absorb complex noises such as engine noise, road noise, and wind noise.

[0004] 2. Some sound insulation materials are thick and occupy a larger space inside the car, which is not conducive to the rational use of the space inside the car.

[0005] 3. The thermal conductivity of some sound insulation materials is high, which is not conducive to the control of the temperature inside the car. Especially in summer, it will cause the temperature inside the car to rise and increase the energy consumption of air conditioning. Summary of the invention

[0006] The embodiments of the present invention provide a method and system for producing a multi-layer composite automobile interior sound insulation material with a high sound absorption coefficient, which can solve the problems in the prior art.

[0007] According to a first aspect of the embodiments of the present invention, Provide a production method for a multi-layer composite automobile interior sound insulation material with a high sound absorption coefficient, including: The polyester fiber raw material is screened by a high-frequency vibration screening device, the screened polyester fiber raw material is surface-modified by a radio frequency plasma surface activation treatment unit under an inert gas protection environment, and a carboxyl functional group is formed on the surface of the polyester fiber raw material, and the treated polyester fiber raw material is transported to a hot air circulation web-forming machine under a vacuum negative pressure state by an air flow conveying device, and the treated polyester fiber raw material is formed into a first fiber web layer in the hot air circulation web-forming machine; The first fiber web layer is conveyed to an ultrasonic needling machine, and the first fiber web layer is needled by an ultrasonic vibrating needle in the ultrasonic needling machine to form an inclined through-hole in the first fiber web layer, wherein the angle between the inclined through-hole and the surface of the first fiber web layer is 60-75 degrees, and a spiral microscopic rough structure is formed on the inner wall of the inclined through-hole; The first fiber mesh layer after needle punching is sequentially passed through a nano titanium dioxide solution impregnation device and a microwave drying device, the first fiber mesh layer after impregnation is passed through a rolling device to collect liquid, the first fiber mesh layer after rolling enters the microwave drying device, a nano titanium dioxide adsorption layer is formed on the surface of the first fiber mesh layer, the anatase phase content of the titanium dioxide grains is greater than 95 weight percent, and finally the high sound absorption coefficient multilayer composite automobile interior sound insulation material is obtained, the average sound absorption coefficient of the high sound absorption coefficient multilayer composite automobile interior sound insulation material in the frequency range of 250-2000 Hz is greater than 0.85, and the thermal conductivity of the high sound absorption coefficient multilayer composite automobile interior sound insulation material is less than 0.035 W / m·K.

[0008] The vibration frequency of the high-frequency vibration screening device is 120-150 Hz, the fiber length of the polyester fiber raw material is 38-42 mm, and the linear density of the polyester fiber raw material is 2.5-3.5 denier; The inert gas is argon, the radio frequency power of the radio frequency plasma surface activation treatment unit is 800-1000 watts, and the treatment time is 30-60 seconds; The surface density of the carboxyl functional groups is 2.5-3.0 per square nanometer.

[0009] The pitch of the spiral microscopic rough structure is 100-150 microns, the density of the inclined through-holes is 80-120 per square centimeter, the diameter of the inclined through-holes is 0.8-1.2 millimeters, and the travel speed of the needle punching treatment in the first fiber web layer is 2.5-3.0 meters per minute; The concentration of the nano titanium dioxide solution is 8-12 weight percent, the pH value of the nano titanium dioxide solution is 6.5-7.5, the immersion temperature of the immersion device is 40-50 degrees Celsius, and the immersion time is 5-8 minutes; The thickness of the nano titanium dioxide adsorption layer is 200-300 nanometers, and the size of titanium dioxide grains in the nano titanium dioxide adsorption layer is 30-50 nanometers.

[0010] The polyester fiber raw material is screened by a high-frequency vibration screening device, the screened polyester fiber raw material is surface-modified by a radio frequency plasma surface activation treatment unit under an inert gas protection environment, and a carboxyl functional group is formed on the surface of the polyester fiber raw material. The treated polyester fiber raw material is transported to a hot air circulation web-forming machine under a vacuum negative pressure state by an air flow conveying device, and the treated polyester fiber raw material is made into a first fiber web layer in the hot air circulation web-forming machine, including: The screened polyester fiber raw material is transported to a radio frequency plasma surface activation treatment unit, and the surface of the polyester fiber raw material is modified under an argon protective atmosphere, and a carboxyl functional group with a specified density is formed on the surface of the polyester fiber raw material by controlling the purity of the argon gas, the flow rate of the argon gas, the volume of the discharge chamber of the radio frequency plasma surface activation treatment unit, the radio frequency power of the radio frequency plasma surface activation treatment unit, and the treatment time of the radio frequency plasma surface activation treatment unit, and by adjusting the ratio of the radio frequency power to the volume of the discharge chamber to adjust the plasma density; The surface-modified polyester fiber raw material is transported to a vacuum negative pressure airflow transport system, and the polyester fiber raw material is kept in a laminar transport state in the transport pipeline by adjusting the vacuum negative pressure of the vacuum negative pressure airflow transport system, the pneumatic resistance in the vacuum negative pressure airflow transport system, the pressure gradient force in the vacuum negative pressure airflow transport system, and the airflow velocity in the transport pipeline of the vacuum negative pressure airflow transport system; The polyester fiber raw material after conveying is conveyed to a hot air circulation web-forming machine for web-forming, and the deposition rate of the fiber on the web plate is controlled by adjusting the hot air temperature, the hot air speed, and the web plate moving speed of the hot air circulation web-forming machine, and the deposition uniformity of the fiber is controlled by adjusting the deposition coefficient and the attenuation coefficient during the fiber deposition process; The process parameters of the hot air circulation web-forming machine are coordinated and controlled, and a uniform fiber web layer with a specified surface density is obtained by adjusting the ratio of the surface charge density of the surface-modified polyester fiber raw material to the reference charge density, the ratio of the air flow velocity in the conveying pipe to the reference velocity, and the ratio of the hot air temperature to the reference temperature. The uniform fiber web layer has a uniform fiber orientation angle distribution and fiber distribution uniformity.

[0011] The first fiber web layer is transported to an ultrasonic needling machine, and the first fiber web layer is needled by an ultrasonic vibrating needle in the ultrasonic needling machine to form an inclined through-hole in the first fiber web layer, wherein the angle between the inclined through-hole and the surface of the first fiber web layer is 60-75 degrees, and a spiral microscopic rough structure is formed on the inner wall of the inclined through-hole, including: The first fiber web layer is conveyed to an ultrasonic needling machine, wherein the ultrasonic needling machine comprises an ultrasonic vibration needle head, wherein the ultrasonic vibration needle head is provided with a circumferential spiral roughening texture; Controlling the ultrasonic vibration needle to generate high-frequency vibration, the ultrasonic vibration needle generates periodic pressure waves in the high-frequency vibration state, the periodic pressure waves interact mechanically with the first fiber mesh layer, so that the fiber structure of the first fiber mesh layer undergoes controllable deformation in a local area; Controlling the ultrasonic vibration needle to penetrate the first fiber mesh layer at a preset angle, the ultrasonic vibration needle generates a composite motion of axial feeding motion and radial vibration motion during the penetration process, and forms an inclined through-hole in the first fiber mesh layer; During the composite motion of the ultrasonic vibration needle, the circumferential spiral roughening texture on the surface of the ultrasonic vibration needle generates periodic friction with the fibers in the first fiber mesh layer, and a spiral microscopic rough structure is formed on the inner wall of the inclined through-hole through the periodic friction; Controlling the vibration frequency, vibration amplitude and feed speed of the ultrasonic vibration needle, adjusting the friction power density generated by the periodic friction, so that the spiral period and roughness of the spiral microscopic rough structure reach preset values; During the forming process of the inclined through-channel, the vibration energy of the ultrasonic vibration needle is controlled to apply a stress field to the first fiber mesh layer, thereby suppressing the elastic recovery effect of the first fiber mesh layer and maintaining the structural stability of the inclined through-channel.

[0012] The first fiber web layer after needle punching is sequentially passed through a nano titanium dioxide solution impregnation device and a microwave drying device, the first fiber web layer after impregnation is passed through a rolling device to collect liquid, the first fiber web layer after rolling enters the microwave drying device, and forming a nano titanium dioxide adsorption layer on the surface of the first fiber web layer comprises: The first fiber web layer is transported to a nano-titanium dioxide solution impregnation device, wherein the nano-titanium dioxide solution impregnation device is provided with a temperature control system and a concentration monitoring system, and the temperature and concentration of the nano-titanium dioxide solution are adjusted by the temperature control system and the concentration monitoring system; Controlling the immersion time of the first fiber mesh layer in the nano titanium dioxide solution so that the nano titanium dioxide solution generates capillary penetration along the thickness direction of the first fiber mesh layer, and the nano titanium dioxide solution penetrates into the internal structure of the first fiber mesh layer under the capillary penetration; The first fiber web layer after impregnation is conveyed to a rolling device, wherein the rolling device comprises an upper roller and a lower roller, wherein the pressure distribution between the upper roller and the lower roller is a Hertzian contact distribution, and the nano titanium dioxide solution in the first fiber web layer after impregnation is redistributed through the rolling action of the upper roller and the lower roller; A solution collecting tank is provided at the discharge end of the rolling device, the solution collecting tank is used to collect the nano titanium dioxide solution precipitated from the first fiber web layer during the rolling process, and the solution collecting tank is connected to the nano titanium dioxide solution impregnation device to circulate the nano titanium dioxide solution; The rolled first fiber web layer is conveyed to a microwave drying device, wherein the microwave drying device comprises a plurality of independently controlled microwave heating units, and the temperature field distribution of the first fiber web layer in the thickness direction is controlled by adjusting the power density of the microwave heating units; The microwave heating power in the microwave drying device is controlled so that nano-titanium dioxide forms a crystal core on the surface of the first fiber mesh layer. The crystal core grows into nano-crystal grains under the action of the microwave heating power. The nano-crystal grains form a stable nano-titanium dioxide adsorption layer on the surface of the first fiber mesh layer through intermolecular forces.

[0013] A second aspect of the embodiments of the present invention provides a production system for a multi-layer composite automobile interior sound insulation material with a high sound absorption coefficient, comprising: The first unit is used to screen the polyester fiber raw material through a high-frequency vibration screening device, and the screened polyester fiber raw material is surface-modified by a radio frequency plasma surface activation treatment unit under an inert gas protection environment to form a carboxyl functional group on the surface of the polyester fiber raw material. The treated polyester fiber raw material is transported to a hot air circulation web-forming machine under a vacuum negative pressure state through an air flow conveying device, and the treated polyester fiber raw material is made into a first fiber web layer in the hot air circulation web-forming machine; The second unit is used to transport the first fiber web layer to an ultrasonic needling machine, and perform needling treatment on the first fiber web layer by an ultrasonic vibrating needle in the ultrasonic needling machine, so as to form an inclined through-hole in the first fiber web layer, wherein the angle between the inclined through-hole and the surface of the first fiber web layer is 60-75 degrees, and a spiral microscopic rough structure is formed on the inner wall of the inclined through-hole; The third unit is used to sequentially pass the first fiber mesh layer that has been needle-punched through a nano-titanium dioxide solution impregnation device and a microwave drying device, the first fiber mesh layer after impregnation is passed through a rolling device to collect liquid, the first fiber mesh layer after rolling enters the microwave drying device, a nano-titanium dioxide adsorption layer is formed on the surface of the first fiber mesh layer, the anatase phase content of the titanium dioxide grains is greater than 95 weight percent, and finally the high sound absorption coefficient multi-layer composite automobile interior sound insulation material is obtained, the average sound absorption coefficient of the high sound absorption coefficient multi-layer composite automobile interior sound insulation material in the frequency range of 250-2000 Hz is greater than 0.85, and the thermal conductivity of the high sound absorption coefficient multi-layer composite automobile interior sound insulation material is less than 0.035 W / m·K.

[0014] A third aspect of the embodiments of the present invention An electronic device is provided, comprising: processor; a memory for storing processor-executable instructions; The processor is configured to call the instructions stored in the memory to execute the aforementioned method.

[0015] A fourth aspect of the embodiments of the present invention is: A computer-readable storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the aforementioned method is implemented.

[0016] The beneficial effects of this application are as follows: Excellent sound absorption performance: by forming carboxyl functional groups on the surface of polyester fibers, constructing inclined through-holes and spiral microscopic rough structures, and attaching a nano-titanium dioxide adsorption layer on the surface, the average sound absorption coefficient of the material in the frequency range of 250-2000 Hz is greater than 0.85, which effectively absorbs car noise and improves ride comfort.

[0017] Good thermal insulation performance: The thermal conductivity of this material is less than 0.035 W / m·K, and it has good thermal insulation performance. It can effectively block the heat transfer from the engine and the external environment, maintain a stable temperature inside the car, and reduce energy consumption.

[0018] Simple and efficient process: This production method adopts technologies such as radio frequency plasma surface modification, ultrasonic acupuncture, nano-titanium dioxide solution impregnation and microwave drying. The process flow is simple, the production efficiency is high, and it is convenient for large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the process of producing a multi-layer composite automobile interior sound insulation material with a high sound absorption coefficient according to an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a system for producing a multi-layer composite automobile interior sound insulation material with a high sound absorption coefficient according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0022] Figure 1FIG. 1 is a schematic diagram of a process for producing a multilayer composite automobile interior sound insulation material with a high sound absorption coefficient according to an embodiment of the present invention. Figure 1 As shown, the method includes: S101. The polyester fiber raw material is screened by a high-frequency vibration screening device, and the screened polyester fiber raw material is surface-modified by a radio frequency plasma surface activation treatment unit under an inert gas protection environment to form carboxyl functional groups on the surface of the polyester fiber raw material, and the treated polyester fiber raw material is transported to a hot air circulation web-forming machine under a vacuum negative pressure state by an air flow conveying device, and the treated polyester fiber raw material is formed into a first fiber web layer in the hot air circulation web-forming machine; S102. The first fiber web layer is conveyed to an ultrasonic needling machine, and the first fiber web layer is needled by an ultrasonic vibrating needle in the ultrasonic needling machine to form an inclined through-hole in the first fiber web layer, wherein the angle between the inclined through-hole and the surface of the first fiber web layer is 60-75 degrees, and a spiral microscopic rough structure is formed on the inner wall of the inclined through-hole; S103. The first fiber web layer that has been needle-punched is sequentially passed through a nano titanium dioxide solution impregnation device and a microwave drying device, the first fiber web layer after impregnation is passed through a rolling device to collect liquid, the first fiber web layer after rolling enters the microwave drying device, a nano titanium dioxide adsorption layer is formed on the surface of the first fiber web layer, the anatase phase content of the titanium dioxide grains is greater than 95 weight percent, and finally the high sound absorption coefficient multi-layer composite automobile interior sound insulation material is obtained, the average sound absorption coefficient of the high sound absorption coefficient multi-layer composite automobile interior sound insulation material in the frequency range of 250-2000 Hz is greater than 0.85, and the thermal conductivity of the high sound absorption coefficient multi-layer composite automobile interior sound insulation material is less than 0.035 W / m·K.

[0023] In an optional embodiment, the vibration frequency of the high-frequency vibration screening device is 120-150 Hz, the fiber length of the polyester fiber raw material is 38-42 mm, and the linear density of the polyester fiber raw material is 2.5-3.5 denier; The inert gas is argon, the radio frequency power of the radio frequency plasma surface activation treatment unit is 800-1000 watts, and the treatment time is 30-60 seconds; The surface density of the carboxyl functional groups is 2.5-3.0 per square nanometer.

[0024] A method for surface activation treatment of polyester fiber raw materials is intended to increase the density of its surface carboxyl functional groups and enhance its bonding performance with other materials. The core of the method is the combination of high-frequency vibration screening, inert gas radio frequency plasma treatment and precise control of process parameters.

[0025] First, the polyester fiber raw materials are screened to ensure the uniformity of fiber length and linear density. A high-frequency vibration screening device with a vibration frequency of 120-150 Hz is used to screen out polyester fiber raw materials with a fiber length of 38-42 mm and a linear density of 2.5-3.5 deniers. For example, a vibrating screen with a vibration frequency of 135 Hz is selected to screen out polyester fiber raw materials with a fiber length of 40 mm and a linear density of 3 deniers. The purpose of this step is to remove fibers that are too long or too short, too thick or too thin, to ensure the consistency of subsequent processing and the quality stability of the final product.

[0026] Next, the screened polyester fiber raw materials are sent to the RF plasma surface activation treatment unit. This unit uses argon as an inert gas, the RF power is set to 800-1000 watts, and the treatment time is controlled within the range of 30-60 seconds. For example, with argon as the plasma gas source, the RF power is set to 900 watts, and the treatment time is set to 45 seconds. Argon plasma can effectively activate the surface of polyester fibers, making it easier to combine with carboxyl functional groups introduced in subsequent treatments. Accurately controlling the RF power and treatment time can not only ensure the activation effect, but also avoid excessive damage to the fibers.

[0027] After the RF plasma treatment is completed, the polyester fiber raw material is subjected to a carboxyl functional group grafting treatment. The surface activity of the polyester fiber after the plasma treatment is improved, and it is easier to react chemically with the carboxyl functional group. By controlling the reaction conditions, the carboxyl functional group is evenly distributed on the fiber surface, and finally reaches a surface density of 2.5-3.0 per square nanometer. For example, by controlling the reaction time and the concentration of the reactants, the surface density of the carboxyl functional group finally reaches 2.8 per square nanometer.

[0028] The beneficial effects of this method are reflected in the following three aspects: 1. Improve fiber surface activity: Argon radio frequency plasma treatment effectively improves the activity of the polyester fiber surface, making it easier to carry out subsequent chemical modification, thereby enhancing the bonding performance of the fiber with other materials.

[0029] 2. Precise control of carboxyl functional group density: By precisely controlling the plasma treatment parameters and grafting reaction conditions, the surface density of carboxyl functional groups can be precisely controlled to reach the desired target value, thereby meeting the needs of different application scenarios.

[0030] 3. Enhanced fiber modification effect: High-frequency vibration screening ensures the uniformity of the fiber, plasma treatment improves the surface activity of the fiber, and the introduction of carboxyl functional groups gives the fiber new chemical properties. These factors work together to significantly enhance the fiber modification effect and expand the application range of polyester fibers.

[0031] In an optional embodiment, the pitch of the spiral microscopic rough structure is 100-150 microns, the density of the inclined through-holes is 80-120 per square centimeter, the diameter of the inclined through-holes is 0.8-1.2 millimeters, and the travel speed of the needle punching treatment in the first fiber web layer is 2.5-3.0 meters per minute; The concentration of the nano titanium dioxide solution is 8-12 weight percent, the pH value of the nano titanium dioxide solution is 6.5-7.5, the immersion temperature of the immersion device is 40-50 degrees Celsius, and the immersion time is 5-8 minutes; The thickness of the nano titanium dioxide adsorption layer is 200-300 nanometers, and the size of titanium dioxide grains in the nano titanium dioxide adsorption layer is 30-50 nanometers.

[0032] A method for preparing a composite functional filter material with a spiral microscopic rough structure and a nano titanium dioxide adsorption layer, using a first fiber mesh layer as a substrate, constructing a spiral microscopic rough structure on its surface, and forming a nano titanium dioxide adsorption layer on its surface by an immersion method.

[0033] First, the first fiber mesh layer is needle-punched to form a spiral microscopic rough structure on its surface. The needle-punching treatment uses a needle plate with multiple needles arranged, and the needle-punching direction has a certain angle with the traveling direction of the fiber mesh layer to form a spiral track. The pitch of the spiral microscopic rough structure is controlled between 100-150 microns, the density of the inclined through-holes is controlled between 80-120 per square centimeter, and the diameter of the inclined through-holes is controlled between 0.8-1.2 mm. For example, the pitch is selected to be 120 microns, the hole density is 100 per square centimeter, and the hole diameter is 1.0 mm. The travel speed of the needle-punching treatment is controlled at 2.5-3.0 meters per minute, for example, 2.8 meters per minute is selected. The appropriate needle-punching speed can ensure the formation of a uniform spiral microscopic rough structure.

[0034] Next, prepare a nano titanium dioxide solution. Add nano titanium dioxide powder to deionized water, stir to fully disperse it, and adjust the pH value of the solution with acid or alkali. The concentration of the nano titanium dioxide solution is controlled at 8-12 weight percent, for example, 10 weight percent. The pH value of the solution is controlled at 6.5-7.5, for example, the pH value is selected to be 7.0. This can ensure the stability and good adsorption performance of the nano titanium dioxide particles.

[0035] Then, the first fiber mesh layer after needle punching is immersed in the nano titanium dioxide solution. The temperature of the immersion device is controlled at 40-50 degrees Celsius, for example, 45 degrees Celsius. The immersion time is controlled at 5-8 minutes, for example, 6 minutes. The appropriate temperature and time can ensure that the nano titanium dioxide particles are fully adsorbed on the surface of the fiber mesh layer.

[0036] Finally, the impregnated fiber mesh layer is taken out and dried to form a nano titanium dioxide adsorption layer. The thickness of the nano titanium dioxide adsorption layer is controlled to be 200-300 nanometers, for example, 250 nanometers. The titanium dioxide grain size in the adsorption layer is controlled to be 30-50 nanometers, for example, 40 nanometers. This can ensure that the adsorption layer has a large specific surface area and a high adsorption activity.

[0037] The beneficial effects of the composite functional filter material are reflected in the following three aspects: 1. Improve filtration efficiency: The spiral microscopic rough structure increases the specific surface area and porosity of the filter material, which is conducive to intercepting particulate matter. At the same time, the inclined through-hole channel can guide the airflow or liquid, prolong its residence time in the filter material, and improve the filtration efficiency.

[0038] 2. Enhanced adsorption performance: The nano titanium dioxide adsorption layer has a large specific surface area and high adsorption activity, which can effectively adsorb pollutants in the air or liquid, such as harmful gases such as formaldehyde and benzene, as well as heavy metal ions.

[0039] 3. Improved durability: The nano titanium dioxide adsorption layer is firmly combined with the fiber mesh layer and is not easy to fall off, which can ensure the long-term stability and durability of the filter material. The spiral structure also enhances the mechanical strength of the material, making it more wear-resistant.

[0040] In an optional embodiment, the polyester fiber raw material is screened by a high-frequency vibration screening device, the screened polyester fiber raw material is surface-modified by a radio frequency plasma surface activation treatment unit under an inert gas protection environment, and a carboxyl functional group is formed on the surface of the polyester fiber raw material. The treated polyester fiber raw material is transported to a hot air circulation web-forming machine under a vacuum negative pressure state by an air flow conveying device, and the treated polyester fiber raw material is formed into a first fiber web layer in the hot air circulation web-forming machine, which includes: The screened polyester fiber raw material is transported to a radio frequency plasma surface activation treatment unit, and the surface of the polyester fiber raw material is modified under an argon protective atmosphere, and a carboxyl functional group with a specified density is formed on the surface of the polyester fiber raw material by controlling the purity of the argon gas, the flow rate of the argon gas, the volume of the discharge chamber of the radio frequency plasma surface activation treatment unit, the radio frequency power of the radio frequency plasma surface activation treatment unit, and the treatment time of the radio frequency plasma surface activation treatment unit, and by adjusting the ratio of the radio frequency power to the volume of the discharge chamber to adjust the plasma density; The surface-modified polyester fiber raw material is transported to a vacuum negative pressure airflow transport system, and the polyester fiber raw material is kept in a laminar transport state in the transport pipeline by adjusting the vacuum negative pressure of the vacuum negative pressure airflow transport system, the pneumatic resistance in the vacuum negative pressure airflow transport system, the pressure gradient force in the vacuum negative pressure airflow transport system, and the airflow velocity in the transport pipeline of the vacuum negative pressure airflow transport system; The polyester fiber raw material after conveying is conveyed to a hot air circulation web-forming machine for web-forming, and the deposition rate of the fiber on the web plate is controlled by adjusting the hot air temperature, the hot air speed, and the web plate moving speed of the hot air circulation web-forming machine, and the deposition uniformity of the fiber is controlled by adjusting the deposition coefficient and the attenuation coefficient during the fiber deposition process; The process parameters of the hot air circulation web-forming machine are coordinated and controlled, and a uniform fiber web layer with a specified surface density is obtained by adjusting the ratio of the surface charge density of the surface-modified polyester fiber raw material to the reference charge density, the ratio of the air flow velocity in the conveying pipe to the reference velocity, and the ratio of the hot air temperature to the reference temperature. The uniform fiber web layer has a uniform fiber orientation angle distribution and fiber distribution uniformity.

[0041] After the polyester fiber raw materials are screened by the high-frequency vibration screen, they enter the radio frequency plasma surface activation treatment unit for surface modification. A high-frequency vibration screen with a mesh size of 80 is selected, the vibration frequency is set to 50Hz, and the screening time is 3 minutes to remove impurities and fibers that do not meet the requirements in the raw materials to ensure the uniformity of the raw materials.

[0042] The screened polyester fiber raw materials enter the RF plasma surface activation treatment unit. The treatment unit uses argon as the protective gas, the argon purity is set to 99.999%, and the argon flow rate is set to 20sccm (standard cubic centimeters per minute). The discharge chamber volume is 5 liters, the RF power is set to 300W, and the treatment time is set to 2 minutes. The plasma density is adjusted by controlling the ratio of RF power to discharge chamber volume (here 60W / L) to form a specified density of carboxyl functional groups on the surface of the polyester fiber raw materials. For example, the target carboxyl functional group density is 1.5×10^15 per square centimeter.

[0043] The surface-modified polyester fiber raw material is transported to the hot air circulation web forming machine through a vacuum negative pressure airflow conveying system. The vacuum negative pressure is set to -50kPa, the conveying pipe diameter is 10cm, and the pipe length is 2 meters. By controlling the vacuum negative pressure, aerodynamic resistance, pressure gradient force, and airflow velocity in the conveying pipe (set to 10m / s), the polyester fiber raw material is kept in a laminar flow state in the conveying pipe to prevent fiber entanglement and agglomeration and ensure uniform fiber dispersion.

[0044] The polyester fiber raw material enters the hot air circulation web forming machine for web forming. The hot air temperature is set to 180°C, the hot air speed is set to 5m / s, and the screen moving speed is set to 0.5m / min. The deposition rate of the fiber on the screen is controlled by controlling the hot air temperature, hot air speed and screen moving speed. At the same time, the deposition coefficient (set to 0.8) and attenuation coefficient (set to 0.2) during the fiber deposition process are controlled to control the deposition uniformity of the fiber, ensuring that the final fiber web layer has uniform thickness and fiber distribution.

[0045] In the whole process, by coordinating the process parameters of the hot air circulation web-forming machine, for example, the ratio of the surface charge density of the surface-modified polyester fiber raw material to the reference charge density is set to 1.2, the ratio of the air flow velocity in the conveying pipeline to the reference velocity is set to 1.5, and the ratio of the hot air temperature to the reference temperature is set to 1.1, and finally a uniform fiber web layer with a specified surface density (for example, 20g / square meter) is obtained. The fiber web layer has a uniform fiber orientation angle distribution (for example, the standard deviation is less than 5°) and fiber distribution uniformity (for example, the coefficient of variation is less than 10%).

[0046] Beneficial effect 1: Improving the uniformity of the fiber web layer: By precisely controlling the RF plasma treatment parameters, airflow conveying parameters and web forming parameters, a fiber web layer with uniform thickness, fiber orientation and fiber distribution can be obtained.

[0047] Beneficial effect 2: Enhanced performance of the fiber mesh layer: Plasma treatment introduces carboxyl functional groups on the fiber surface, which can improve the hydrophilicity and adhesion of the fiber, thereby improving the strength, toughness and stability of the fiber mesh layer.

[0048] Beneficial effect three: Realize customized production of fiber mesh layer: By adjusting the process parameters, the thickness, porosity, fiber orientation and other characteristics of the fiber mesh layer can be controlled to meet the needs of different application fields.

[0049] In an optional embodiment, the first fiber web layer is transported to an ultrasonic needling machine, and the first fiber web layer is needled by an ultrasonic vibrating needle in the ultrasonic needling machine to form an inclined through-hole in the first fiber web layer, wherein the angle between the inclined through-hole and the surface of the first fiber web layer is 60-75 degrees, and a spiral microscopic rough structure is formed on the inner wall of the inclined through-hole, including: The first fiber web layer is conveyed to an ultrasonic needling machine, wherein the ultrasonic needling machine comprises an ultrasonic vibration needle head, wherein the ultrasonic vibration needle head is provided with a circumferential spiral roughening texture; Controlling the ultrasonic vibration needle to generate high-frequency vibration, the ultrasonic vibration needle generates periodic pressure waves in the high-frequency vibration state, the periodic pressure waves interact mechanically with the first fiber mesh layer, so that the fiber structure of the first fiber mesh layer undergoes controllable deformation in a local area; Controlling the ultrasonic vibration needle to penetrate the first fiber mesh layer at a preset angle, the ultrasonic vibration needle generates a composite motion of axial feeding motion and radial vibration motion during the penetration process, and forms an inclined through-hole in the first fiber mesh layer; During the composite motion of the ultrasonic vibration needle, the circumferential spiral roughening texture on the surface of the ultrasonic vibration needle generates periodic friction with the fibers in the first fiber mesh layer, and a spiral microscopic rough structure is formed on the inner wall of the inclined through-hole through the periodic friction; Controlling the vibration frequency, vibration amplitude and feed speed of the ultrasonic vibration needle, adjusting the friction power density generated by the periodic friction, so that the spiral period and roughness of the spiral microscopic rough structure reach preset values; During the forming process of the inclined through-channel, the vibration energy of the ultrasonic vibration needle is controlled to apply a stress field to the first fiber mesh layer, thereby suppressing the elastic recovery effect of the first fiber mesh layer and maintaining the structural stability of the inclined through-channel.

[0050] First, prepare the required materials: the first fiber mesh layer. The first fiber mesh layer can be made of various fiber materials, such as polyester fiber, polypropylene fiber, nylon fiber, natural fiber, etc., or a mixture of multiple fibers. For example, a polyester fiber mesh layer with a gram weight of 150 g / m2 is selected.

[0051] Then prepare an ultrasonic acupuncture machine. The acupuncture machine is equipped with an ultrasonic vibrating needle head, and the surface of the needle head is engraved with a circumferential spiral roughening texture. The spiral period of the spiral roughening texture is, for example, 0.5 mm, and the roughness is, for example, 10 microns. The vibration frequency, vibration amplitude and feed speed of the ultrasonic vibrating needle head are controllable. For example, an ultrasonic vibrating needle head with a frequency of 20 kHz can be selected.

[0052] The prepared first fiber mesh layer is conveyed to the operating platform of the ultrasonic needling machine to ensure that the fiber mesh layer is flat and tensioned to avoid displacement or wrinkles during the needling process.

[0053] Start the ultrasonic acupuncture machine and control the ultrasonic vibrating needle to generate high-frequency vibration. For example, set the vibration frequency to 20kHz and the amplitude to 10 microns. The ultrasonic vibrating needle generates periodic pressure waves under high-frequency vibration. The periodic pressure waves interact mechanically with the first fiber mesh layer, causing the fiber structure of the first fiber mesh layer to undergo controllable deformation in a local area, preparing for the subsequent formation of an inclined through-hole.

[0054] The ultrasonic vibration needle head is controlled to penetrate the first fiber mesh layer at a preset angle. The preset angle range is 60-75 degrees, for example, 65 degrees is selected. The ultrasonic vibration needle head generates a composite motion of axial feeding motion and radial vibration motion during the penetration process. The feeding speed is controlled to be, for example, 2 mm / s. An inclined through-hole is formed in the first fiber mesh layer.

[0055] During the composite motion of the ultrasonic vibration needle, the circumferential spiral roughening texture on the surface of the ultrasonic vibration needle generates periodic friction with the fibers in the first fiber mesh layer, thereby forming a spiral microscopic rough structure on the inner wall of the inclined through-hole.

[0056] By controlling the vibration frequency, vibration amplitude and feed speed of the ultrasonic vibration needle, the friction power density generated by periodic friction is adjusted so that the spiral period and roughness of the spiral micro-rough structure reach the preset values. For example, by setting the vibration frequency to 20kHz, the amplitude to 10 microns, and the feed speed to 2 mm / s, the spiral period of the spiral micro-rough structure can be 0.5 mm and the roughness can be 10 microns.

[0057] During the forming process of the inclined through-channel, the vibration energy of the ultrasonic vibration needle is controlled to apply a stress field to the first fiber mesh layer, thereby suppressing the elastic recovery effect of the first fiber mesh layer, maintaining the structural stability of the inclined through-channel, and preventing the channel from closing or deforming.

[0058] The beneficial effects of this technical solution can be summarized into the following three parts: Improve material performance: By forming inclined through-holes and spiral micro-rough structures in the fiber mesh layer, the air permeability, moisture absorption, warmth retention and filtration performance of the fiber mesh layer can be significantly improved. The inclined pore structure is more conducive to the circulation of gas and liquid, while the spiral micro-rough structure can increase the specific surface area of ​​the material, thereby enhancing its functional characteristics.

[0059] Enhanced structural stability: The stress field generated by ultrasonic vibration suppresses the elastic recovery of the fiber mesh layer, making the formed inclined through-holes and spiral micro-rough structure more stable and less prone to deformation or collapse, thus ensuring the durability of material performance.

[0060] The process is simple and efficient: ultrasonic acupuncture technology is used, and no chemical reagents or complex processing equipment are required. The process is simple, the production efficiency is high, the cost is low, and it is environmentally friendly.

[0061] In an optional embodiment, the first fiber web layer that has been needle-punched is sequentially passed through a nano-titanium dioxide solution impregnation device and a microwave drying device, the impregnated first fiber web layer is passed through a rolling device to collect liquid, and the rolled first fiber web layer enters the microwave drying device, and forming a nano-titanium dioxide adsorption layer on the surface of the first fiber web layer includes: The first fiber web layer is transported to a nano-titanium dioxide solution impregnation device, wherein the nano-titanium dioxide solution impregnation device is provided with a temperature control system and a concentration monitoring system, and the temperature and concentration of the nano-titanium dioxide solution are adjusted by the temperature control system and the concentration monitoring system; Controlling the immersion time of the first fiber mesh layer in the nano titanium dioxide solution so that the nano titanium dioxide solution generates capillary penetration along the thickness direction of the first fiber mesh layer, and the nano titanium dioxide solution penetrates into the internal structure of the first fiber mesh layer under the capillary penetration; The first fiber web layer after impregnation is conveyed to a rolling device, wherein the rolling device comprises an upper roller and a lower roller, wherein the pressure distribution between the upper roller and the lower roller is a Hertzian contact distribution, and the nano titanium dioxide solution in the first fiber web layer after impregnation is redistributed through the rolling action of the upper roller and the lower roller; A solution collecting tank is provided at the discharge end of the rolling device, the solution collecting tank is used to collect the nano titanium dioxide solution precipitated from the first fiber web layer during the rolling process, and the solution collecting tank is connected to the nano titanium dioxide solution impregnation device to circulate the nano titanium dioxide solution; The rolled first fiber web layer is conveyed to a microwave drying device, wherein the microwave drying device comprises a plurality of independently controlled microwave heating units, and the temperature field distribution of the first fiber web layer in the thickness direction is controlled by adjusting the power density of the microwave heating units; The microwave heating power in the microwave drying device is controlled so that nano-titanium dioxide forms a crystal core on the surface of the first fiber mesh layer. The crystal core grows into nano-crystal grains under the action of the microwave heating power. The nano-crystal grains form a stable nano-titanium dioxide adsorption layer on the surface of the first fiber mesh layer through intermolecular forces.

[0062] Specific implementation method of preparing nano titanium dioxide adsorption layer from the first fiber web layer after needle punching: First, prepare a first fiber mesh layer after needle punching. The fiber mesh layer can be made of polyester, polypropylene, nylon and other materials, with a thickness ranging from 0.1mm to 5mm, for example, a polyester fiber mesh layer with a thickness of 0.5mm is selected. The purpose of needle punching is to increase the specific surface area and porosity of the fiber mesh layer, which is conducive to the penetration and adsorption of the nano titanium dioxide solution.

[0063] Next, the prepared first fiber mesh layer is transported to the nano-titanium dioxide solution impregnation device. The device is equipped with a temperature control system and a concentration monitoring system. The temperature of the nano-titanium dioxide solution is controlled between 20-60°C, for example, set to 40°C, and the concentration of the solution is monitored in real time by the concentration monitoring system to maintain it between 0.5%-5%, for example, maintained at 2%. The immersion time of the first fiber mesh layer in the nano-titanium dioxide solution is controlled to be 1-10 minutes, for example, set to 5 minutes, to ensure that the solution fully penetrates into the internal structure of the fiber mesh layer.

[0064] After the impregnation is completed, the first fiber mesh layer is conveyed to the rolling device. The device consists of a pair of upper and lower rollers, and the roller gap is adjustable to control the rolling pressure. The roller gap is adjusted so that the pressure distribution between the upper and lower rollers is Hertzian contact distribution, and the pressure is controlled between 0.1-1MPa, for example, set to 0.5MPa. Through the rolling action, the nano-titanium dioxide solution inside the fiber mesh layer can be redistributed, the excess solution can be squeezed out, and the nano-titanium dioxide particles can be more evenly dispersed on the surface of the fiber mesh layer. A solution collection tank is set at the discharge end of the rolling device to collect the nano-titanium dioxide solution precipitated from the fiber mesh layer during the rolling process, and the collected solution is refluxed to the nano-titanium dioxide solution impregnation device to achieve the recycling of the solution and reduce the waste of the solution.

[0065] Subsequently, the first fiber mesh layer after rolling is conveyed to a microwave drying device. The device is composed of a plurality of independently controlled microwave heating units, which can accurately control the temperature field distribution of the fiber mesh layer in the thickness direction. By adjusting the power density of the microwave heating unit, for example, controlling the power density between 0.5-5kW / m³, for example, setting it to 2kW / m³, the temperature of each part of the fiber mesh layer can be uniformly increased to avoid local overheating. The microwave heating power is controlled to maintain it between 500-2000W, for example, set it to 1000W, and the heating time is controlled between 1-5 minutes, for example, set to 3 minutes, so that the nano-titanium dioxide forms a crystal core on the surface of the fiber mesh layer and grows into nano-crystals under the action of microwave heating. These nano-crystals form a stable nano-titanium dioxide adsorption layer on the surface of the fiber mesh layer through intermolecular forces (such as van der Waals forces, hydrogen bonds, etc.).

[0066] Beneficial effects: Improve adsorption efficiency: The specific surface area and porosity of the fiber mesh layer are increased by needle punching. Combined with the impregnation and roller pressing of nano-titanium dioxide solution, the nano-titanium dioxide particles are evenly distributed on the surface of the fiber mesh layer to form a stable adsorption layer, thereby improving the adsorption efficiency of pollutants.

[0067] Enhanced stability: The nano-crystals formed during the microwave drying process are tightly bound to the surface of the fiber mesh layer through intermolecular forces, making the nano-titanium dioxide adsorption layer more stable and not easy to fall off, thus extending its service life.

[0068] Saving resources: The roller pressing device collects the precipitated nano titanium dioxide solution and returns it to the impregnation device, realizing the recycling of the solution, reducing the waste of the solution and reducing the production cost.

[0069] Figure 2 Schematic diagram of the structure of the production system of multi-layer composite automobile interior sound insulation material with high sound absorption coefficient according to an embodiment of the present invention. Figure 2 As shown, the system comprises: The first unit is used to screen the polyester fiber raw material through a high-frequency vibration screening device, and the screened polyester fiber raw material is surface-modified by a radio frequency plasma surface activation treatment unit under an inert gas protection environment to form a carboxyl functional group on the surface of the polyester fiber raw material. The treated polyester fiber raw material is transported to a hot air circulation web-forming machine under a vacuum negative pressure state through an air flow conveying device, and the treated polyester fiber raw material is made into a first fiber web layer in the hot air circulation web-forming machine; The second unit is used to transport the first fiber web layer to an ultrasonic needling machine, and perform needling treatment on the first fiber web layer by an ultrasonic vibrating needle in the ultrasonic needling machine, so as to form an inclined through-hole in the first fiber web layer, wherein the angle between the inclined through-hole and the surface of the first fiber web layer is 60-75 degrees, and a spiral microscopic rough structure is formed on the inner wall of the inclined through-hole; The third unit is used to sequentially pass the first fiber mesh layer that has been needle-punched through a nano-titanium dioxide solution impregnation device and a microwave drying device, the first fiber mesh layer after impregnation is passed through a rolling device to collect liquid, the first fiber mesh layer after rolling enters the microwave drying device, a nano-titanium dioxide adsorption layer is formed on the surface of the first fiber mesh layer, the anatase phase content of the titanium dioxide grains is greater than 95 weight percent, and finally the high sound absorption coefficient multi-layer composite automobile interior sound insulation material is obtained, the average sound absorption coefficient of the high sound absorption coefficient multi-layer composite automobile interior sound insulation material in the frequency range of 250-2000 Hz is greater than 0.85, and the thermal conductivity of the high sound absorption coefficient multi-layer composite automobile interior sound insulation material is less than 0.035 W / m·K.

[0070] According to a third aspect of the embodiments of the present invention, An electronic device is provided, comprising: processor; a memory for storing processor-executable instructions; The processor is configured to call the instructions stored in the memory to execute the aforementioned method.

[0071] A fourth aspect of the embodiments of the present invention is: A computer-readable storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the aforementioned method is implemented.

[0072] The present invention may be a method, an apparatus, a system and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for executing various aspects of the present invention.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for producing a multi-layer composite automobile interior sound insulation material with a high sound absorption coefficient, characterized in that: include: The polyester fiber raw material is screened by a high-frequency vibration screening device, the screened polyester fiber raw material is surface-modified by a radio frequency plasma surface activation treatment unit under an inert gas protection environment, and a carboxyl functional group is formed on the surface of the polyester fiber raw material, and the treated polyester fiber raw material is transported to a hot air circulation web-forming machine under a vacuum negative pressure state by an air flow conveying device, and the treated polyester fiber raw material is formed into a first fiber web layer in the hot air circulation web-forming machine; The first fiber web layer is conveyed to an ultrasonic needling machine, and the first fiber web layer is needled by an ultrasonic vibrating needle in the ultrasonic needling machine to form an inclined through-hole in the first fiber web layer, wherein the angle between the inclined through-hole and the surface of the first fiber web layer is 60-75 degrees, and a spiral microscopic rough structure is formed on the inner wall of the inclined through-hole; The first fiber mesh layer after needle punching is sequentially passed through a nano titanium dioxide solution impregnation device and a microwave drying device, the first fiber mesh layer after impregnation is passed through a rolling device to collect liquid, the first fiber mesh layer after rolling enters the microwave drying device, a nano titanium dioxide adsorption layer is formed on the surface of the first fiber mesh layer, the anatase phase content of the titanium dioxide grains is greater than 95 weight percent, and finally the high sound absorption coefficient multilayer composite automobile interior sound insulation material is obtained, the average sound absorption coefficient of the high sound absorption coefficient multilayer composite automobile interior sound insulation material in the frequency range of 250-2000 Hz is greater than 0.85, and the thermal conductivity of the high sound absorption coefficient multilayer composite automobile interior sound insulation material is less than 0.035 W / m·K.

2. The method according to claim 1, characterized in that The vibration frequency of the high-frequency vibration screening device is 120-150 Hz, the fiber length of the polyester fiber raw material is 38-42 mm, and the linear density of the polyester fiber raw material is 2.5-3.5 denier; The inert gas is argon, the radio frequency power of the radio frequency plasma surface activation treatment unit is 800-1000 watts, and the treatment time is 30-60 seconds; The surface density of the carboxyl functional groups is 2.5-3.0 per square nanometer.

3. The method according to claim 1, characterized in that The pitch of the spiral microscopic rough structure is 100-150 microns, the density of the inclined through-holes is 80-120 per square centimeter, the diameter of the inclined through-holes is 0.8-1.2 millimeters, and the travel speed of the needle punching treatment in the first fiber web layer is 2.5-3.0 meters per minute; The concentration of the nano titanium dioxide solution is 8-12 weight percent, the pH value of the nano titanium dioxide solution is 6.5-7.5, the immersion temperature of the immersion device is 40-50 degrees Celsius, and the immersion time is 5-8 minutes; The thickness of the nano titanium dioxide adsorption layer is 200-300 nanometers, and the size of titanium dioxide grains in the nano titanium dioxide adsorption layer is 30-50 nanometers.

4. The method according to claim 1, characterized in that: The polyester fiber raw material is screened by a high-frequency vibration screening device, the screened polyester fiber raw material is surface-modified by a radio frequency plasma surface activation treatment unit under an inert gas protection environment, and a carboxyl functional group is formed on the surface of the polyester fiber raw material. The treated polyester fiber raw material is transported to a hot air circulation web-forming machine under a vacuum negative pressure state by an air flow conveying device, and the treated polyester fiber raw material is made into a first fiber web layer in the hot air circulation web-forming machine, including: The screened polyester fiber raw material is transported to a radio frequency plasma surface activation treatment unit, and the surface of the polyester fiber raw material is modified under an argon protective atmosphere, and a carboxyl functional group with a specified density is formed on the surface of the polyester fiber raw material by controlling the purity of the argon gas, the flow rate of the argon gas, the volume of the discharge chamber of the radio frequency plasma surface activation treatment unit, the radio frequency power of the radio frequency plasma surface activation treatment unit, and the treatment time of the radio frequency plasma surface activation treatment unit, and by adjusting the ratio of the radio frequency power to the volume of the discharge chamber to adjust the plasma density; The surface-modified polyester fiber raw material is transported to a vacuum negative pressure airflow transport system, and the polyester fiber raw material is kept in a laminar transport state in the transport pipeline by adjusting the vacuum negative pressure of the vacuum negative pressure airflow transport system, the pneumatic resistance in the vacuum negative pressure airflow transport system, the pressure gradient force in the vacuum negative pressure airflow transport system, and the airflow velocity in the transport pipeline of the vacuum negative pressure airflow transport system; The polyester fiber raw material after conveying is conveyed to a hot air circulation web-forming machine for web-forming, and the deposition rate of the fiber on the web plate is controlled by adjusting the hot air temperature, the hot air speed, and the web plate moving speed of the hot air circulation web-forming machine, and the deposition uniformity of the fiber is controlled by adjusting the deposition coefficient and the attenuation coefficient during the fiber deposition process; The process parameters of the hot air circulation web-forming machine are coordinated and controlled, and a uniform fiber web layer with a specified surface density is obtained by adjusting the ratio of the surface charge density of the surface-modified polyester fiber raw material to the reference charge density, the ratio of the air flow velocity in the conveying pipe to the reference velocity, and the ratio of the hot air temperature to the reference temperature. The uniform fiber web layer has a uniform fiber orientation angle distribution and fiber distribution uniformity.

5. The method according to claim 1, characterized in that The first fiber web layer is transported to an ultrasonic needling machine, and the first fiber web layer is needled by an ultrasonic vibrating needle in the ultrasonic needling machine to form an inclined through-hole in the first fiber web layer, wherein the angle between the inclined through-hole and the surface of the first fiber web layer is 60-75 degrees, and a spiral microscopic rough structure is formed on the inner wall of the inclined through-hole, including: The first fiber web layer is conveyed to an ultrasonic needling machine, wherein the ultrasonic needling machine comprises an ultrasonic vibration needle head, wherein the ultrasonic vibration needle head is provided with a circumferential spiral roughening texture; Controlling the ultrasonic vibration needle to generate high-frequency vibration, the ultrasonic vibration needle generates periodic pressure waves in the high-frequency vibration state, the periodic pressure waves interact mechanically with the first fiber mesh layer, so that the fiber structure of the first fiber mesh layer undergoes controllable deformation in a local area; Controlling the ultrasonic vibration needle to penetrate the first fiber mesh layer at a preset angle, the ultrasonic vibration needle generates a composite motion of axial feeding motion and radial vibration motion during the penetration process, and forms an inclined through-hole in the first fiber mesh layer; During the composite motion of the ultrasonic vibration needle, the circumferential spiral roughening texture on the surface of the ultrasonic vibration needle generates periodic friction with the fibers in the first fiber mesh layer, and a spiral microscopic rough structure is formed on the inner wall of the inclined through-hole through the periodic friction; Controlling the vibration frequency, vibration amplitude and feed speed of the ultrasonic vibration needle, adjusting the friction power density generated by the periodic friction, so that the spiral period and roughness of the spiral microscopic rough structure reach preset values; During the forming process of the inclined through-channel, the vibration energy of the ultrasonic vibration needle is controlled to apply a stress field to the first fiber mesh layer, thereby suppressing the elastic recovery effect of the first fiber mesh layer and maintaining the structural stability of the inclined through-channel.

6. The method according to claim 1, characterized in that The first fiber web layer after needle punching is sequentially passed through a nano titanium dioxide solution impregnation device and a microwave drying device, the first fiber web layer after impregnation is passed through a rolling device to collect liquid, the first fiber web layer after rolling enters the microwave drying device, and forming a nano titanium dioxide adsorption layer on the surface of the first fiber web layer comprises: The first fiber web layer is transported to a nano-titanium dioxide solution impregnation device, wherein the nano-titanium dioxide solution impregnation device is provided with a temperature control system and a concentration monitoring system, and the temperature and concentration of the nano-titanium dioxide solution are adjusted by the temperature control system and the concentration monitoring system; Controlling the immersion time of the first fiber mesh layer in the nano titanium dioxide solution so that the nano titanium dioxide solution generates capillary penetration along the thickness direction of the first fiber mesh layer, and the nano titanium dioxide solution penetrates into the internal structure of the first fiber mesh layer under the capillary penetration; The first fiber web layer after impregnation is conveyed to a rolling device, wherein the rolling device comprises an upper roller and a lower roller, wherein the pressure distribution between the upper roller and the lower roller is a Hertzian contact distribution, and the nano titanium dioxide solution in the first fiber web layer after impregnation is redistributed through the rolling action of the upper roller and the lower roller; A solution collecting tank is provided at the discharge end of the rolling device, the solution collecting tank is used to collect the nano titanium dioxide solution precipitated from the first fiber web layer during the rolling process, and the solution collecting tank is connected to the nano titanium dioxide solution impregnation device to circulate the nano titanium dioxide solution; The rolled first fiber web layer is conveyed to a microwave drying device, wherein the microwave drying device comprises a plurality of independently controlled microwave heating units, and the temperature field distribution of the first fiber web layer in the thickness direction is controlled by adjusting the power density of the microwave heating units; The microwave heating power in the microwave drying device is controlled so that nano-titanium dioxide forms a crystal core on the surface of the first fiber mesh layer. The crystal core grows into nano-crystal grains under the action of the microwave heating power. The nano-crystal grains form a stable nano-titanium dioxide adsorption layer on the surface of the first fiber mesh layer through intermolecular forces.

7. A production system of multi-layer composite automobile interior sound insulation materials with high sound absorption coefficient, used to implement the method described in any one of claims 1 to 6, characterized in that: include: The first unit is used to screen the polyester fiber raw material through a high-frequency vibration screening device, and the screened polyester fiber raw material is surface-modified by a radio frequency plasma surface activation treatment unit under an inert gas protection environment to form a carboxyl functional group on the surface of the polyester fiber raw material. The treated polyester fiber raw material is transported to a hot air circulation web-forming machine under a vacuum negative pressure state through an air flow conveying device, and the treated polyester fiber raw material is made into a first fiber web layer in the hot air circulation web-forming machine; The second unit is used to transport the first fiber web layer to an ultrasonic needling machine, and perform needling treatment on the first fiber web layer by an ultrasonic vibrating needle in the ultrasonic needling machine, so as to form an inclined through-hole in the first fiber web layer, wherein the angle between the inclined through-hole and the surface of the first fiber web layer is 60-75 degrees, and a spiral microscopic rough structure is formed on the inner wall of the inclined through-hole; The third unit is used to sequentially pass the first fiber mesh layer that has been needle-punched through a nano-titanium dioxide solution impregnation device and a microwave drying device, the first fiber mesh layer after impregnation is passed through a rolling device to collect liquid, the first fiber mesh layer after rolling enters the microwave drying device, a nano-titanium dioxide adsorption layer is formed on the surface of the first fiber mesh layer, the anatase phase content of the titanium dioxide grains is greater than 95 weight percent, and finally the high sound absorption coefficient multi-layer composite automobile interior sound insulation material is obtained, the average sound absorption coefficient of the high sound absorption coefficient multi-layer composite automobile interior sound insulation material in the frequency range of 250-2000 Hz is greater than 0.85, and the thermal conductivity of the high sound absorption coefficient multi-layer composite automobile interior sound insulation material is less than 0.035 W / m·K.

8. An electronic device, characterized in that: include: processor; a memory for storing processor-executable instructions; The processor is configured to call the instructions stored in the memory to execute the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having computer program instructions stored thereon, characterized in that: When the computer program instructions are executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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