Composite polymer material and its use in a damping panel of a vehicle

Abstract

This invention belongs to the field of polymer composite materials technology, specifically relating to a composite polymer material and its application in vehicle damping panels. The composite polymer material provided by this invention comprises SBS modified asphalt, fillers, petroleum resin, EVA, silica, silane coupling agent, SBS styrene-butadiene rubber, and plasticizers. The fillers include magnetic powder and KF. The composite polymer material provided by this invention significantly improves the consistency of the material's damping factor, thermal stability, and high and low temperature adhesion performance, ensuring strong and long-lasting magnetic force, thereby meeting the stringent requirements of the automotive industry for lightweight, high reliability, and excellent NVH performance.

Description

Technical Field

[0001] This invention belongs to the field of polymer composite materials technology, specifically relating to a composite polymer material and its application in vehicle damping plates. Background Technology

[0002] While traditional magnetic asphalt resin damping plates are widely used in automotive NVH (noise, vibration, and harshness) performance optimization, they have significant limitations in terms of key performance stability, environmental adaptability, and process reliability. For example, the damping performance (such as loss factor) of existing technologies often fails to meet standards or fluctuates significantly, failing to provide stable and effective vibration reduction at different temperatures. Some materials lack thermal stability at high temperatures, easily exhibiting flow, slippage, or bubbling, while in low-temperature (e.g., -40℃) drop ball tests, they are prone to brittle detachment, severely affecting their durability and safety. A balance between these technical challenges is difficult to achieve. Those skilled in the art believe that the main reason for this is that the most critical technical challenge in the composite process of polymer materials and inorganic materials (such as magnetic powder and fillers) lies in overcoming the agglomeration phenomenon caused by the large specific surface area of ​​inorganic materials and the problem of poor interfacial bonding. Furthermore, the magnetic strength and stability of magnetic materials are also difficult to guarantee, resulting in poor adsorption and fixation effects.

[0003] Therefore, how to improve the organic-inorganic interface in magnetic asphalt resin damping plates has become an important technical problem in this field, and is of great significance to the development of this field. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a composite polymer material and its application in vehicle damping panels. The composite polymer material provided by this invention significantly improves the consistency of the material's damping factor, thermal stability, and high and low temperature adhesion performance, ensuring strong and long-lasting magnetic force, thereby meeting the stringent requirements of the automotive industry for lightweighting, high reliability, and excellent NVH performance.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions.

[0006] This invention provides a composite polymer material comprising SBS modified bitumen, filler, C9 petroleum resin, EVA resin, silica, silane coupling agent, SBS styrene-butadiene rubber, and plasticizer, wherein the filler comprises magnetic powder and potassium fluoride (KF).

[0007] In this invention, the magnetic powder is permanent magnet ferrite powder, preferably strontium ferrite powder and / or barium ferrite powder.

[0008] In this invention, the filler further comprises superphosphate and / or mica powder.

[0009] In this invention, the plasticizer is one or more of N4010, DOTP, DOP, TOTM and TP-90B; preferably DOTP and N4010.

[0010] In this invention, the silane coupling agent is KH550 and / or KH560; preferably KH550.

[0011] In this invention, the components, by weight, satisfy one or more of the following conditions: 1) The SBS modified bitumen is 6-10 parts by weight; 2) The magnetic powder is in the form of 25-30 parts by weight; 3) The amount of the superphosphate is 30-40 parts by weight; 4) The mica powder is in the form of 25-30 parts by weight; 5) The C9 petroleum resin is 4-7 parts by weight; 6) The EVA content is 0.1~0.3 parts by weight; 7) The silica content is 0.1~0.3 parts by weight; 8) The silane coupling agent is present in an amount of 0.1 to 0.4 parts by weight; 9) The SBS styrene-butadiene rubber is 0.5~1 parts by weight; 10) The plasticizer mentioned is 1 to 2 parts by weight.

[0012] In this invention, preferably, KF is 0.5-1.5 parts by weight.

[0013] This invention also provides a method for preparing a composite polymer material, comprising the following steps: S1, SBS modified asphalt, styrene-butadiene rubber, EVA, plasticizer and petroleum resin are heated and mixed evenly to obtain a homogeneous viscoelastic matrix; S2, the homogeneous viscoelastic matrix and filler are sheared and dispersed in a kneader, then a silane coupling agent is added, and after low-speed stirring, the composite masterbatch is obtained by granulation through a twin-screw extruder. The filler includes heavy calcium carbonate, mica powder and magnetic powder. S3, the composite masterbatch is calendered to obtain the composite polymer material; Wherein, the plasticizer is as defined above; the silane coupling agent is as defined above; and the magnetic powder is as defined above.

[0014] In this invention, the filler is composed of heavy calcium carbonate, mica powder and KF.

[0015] In this invention, preferably, KF is a saturated aqueous solution of KF.

[0016] In this invention, the filler is prepared by the following method: heavy calcium carbonate, mica powder and KF are mixed in a ball mill and subjected to full vibration, and then filtered through a 500-mesh sieve to obtain the filler.

[0017] The present invention also provides an application of the above-mentioned composite polymer material in the automotive field; preferably, its application as a vehicle damping plate in the automotive field.

[0018] The present invention also provides a vehicle damping plate comprising the above-mentioned composite polymer material.

[0019] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0020] The reagents and raw materials used in this invention are all commercially available.

[0021] The positive and progressive effects of this invention are as follows: the composite polymer material provided by this invention significantly improves the consistency of the material damping factor, thermal stability and high and low temperature adhesion performance, ensuring strong and long-lasting magnetic force, thereby meeting the stringent requirements of the automotive industry for lightweight, high reliability and excellent NVH performance. Detailed Implementation

[0022] The present invention is further illustrated below by way of embodiments, but the invention is not limited to the scope of the embodiments described herein. Experimental methods in the following embodiments that do not specify specific conditions were performed according to conventional methods and conditions, or as selected according to the product instructions.

[0023] General Methods for Composite Polymer Materials 1 Asphalt modification: SBS modified asphalt (specification: SBS(ID)) is heated to 100℃ and melted. SBS styrene-butadiene rubber, EVA, plasticizer, and petroleum resin are added in sequence. The mixture is stirred at 200-300r / min for 1 hour to form a homogeneous viscoelastic matrix.

[0024] Filler mixing: After thoroughly mixing the filler (such as heavy calcium carbonate, mica powder) and magnetic powder, add them to the matrix in batches and use a kneader to shear and disperse for 30 minutes to avoid agglomeration.

[0025] Additive addition: Add silane coupling agent, stir at low speed for 20 minutes, and finally granulate through a twin-screw extruder to obtain composite masterbatch.

[0026] Molding and curing: The masterbatch is calendered into sheets (thickness 0.9-2.0 mm), the surface is covered with release paper, cut and cured for 24 hours to obtain the composite polymer material.

[0027] General Methods for Composite Polymer Materials 2 Asphalt modification: SBS modified asphalt is heated to 100℃ to melt, and SBS styrene-butadiene rubber, EVA, plasticizer, and petroleum resin are added in sequence. The mixture is stirred at 200-300 r / min for 1 hour to form a homogeneous viscoelastic matrix.

[0028] Filler mixing: By mass percentage: a saturated aqueous solution (LA022) of heavy calcium carbonate, mica powder, magnetic powder and KF is mixed in a ball mill and subjected to full vibration, and then filtered through a 500-mesh sieve to obtain the filler.

[0029] Add fillers (such as heavy calcium carbonate, mica powder and magnetic powder) to the matrix in batches and use a kneader to shear and disperse them for 30 minutes to avoid agglomeration.

[0030] Additive addition: Add silane coupling agent, stir at low speed for 20 minutes, and finally granulate through a twin-screw extruder to obtain composite masterbatch.

[0031] Molding and curing: The masterbatch is calendered into sheets (thickness 0.9-2.0 mm), the surface is covered with release paper, cut and cured for 24 hours to obtain the composite polymer material.

[0032] General Methods for Composite Polymer Materials 3 Asphalt modification: SBS modified asphalt is heated to 100℃ to melt, and SBS styrene-butadiene rubber, EVA, plasticizer, and petroleum resin are added in sequence. The mixture is stirred at 200-300 r / min for 1 hour to form a homogeneous viscoelastic matrix.

[0033] Filler mixing: Filler mixing: After thoroughly mixing the filler (such as heavy calcium carbonate, mica powder), magnetic powder and KF, add it to the matrix in batches and use a kneader to shear and disperse for 30 minutes to avoid agglomeration.

[0034] Additive addition: Add silane coupling agent, stir at low speed for 20 minutes, and finally granulate through a twin-screw extruder to obtain composite masterbatch.

[0035] Molding and curing: The masterbatch is calendered into sheets (thickness 0.9-2.0 mm), the surface is covered with release paper, cut and cured for 24 hours to obtain the composite polymer material.

[0036] Example 1

[0037] Composite polymer materials 1-7 were prepared according to general methods 1-3 and the formulations in Table 1, as shown in Table 1: Table 1

[0038] Application Example 1 The polymer composite materials 1-7 were subjected to the following performance tests, among which: Magnetic force intensity: It is measured by the Hall effect method. Specifically, the damping plate to be tested is placed near the Hall sensor to ensure that the magnetic field lines are perpendicular to the sensitive surface of the Hall element; then the strength of the magnetic field is measured by the Hall element, the magnetic force intensity is calculated, and finally correction and adjustment are made according to the magnetic field distribution and the direction of the magnetic field lines.

[0039] Drop ball test: The polymer composite material is stored at -40℃ for 24 hours. A drop ball is dropped from a height of 230mm onto the back of the polymer composite material. This is repeated three times. If there is no brittle fracture in all three tests, it is recorded as no brittle fracture. If at least one brittle fracture occurs, it is recorded as brittle fracture.

[0040] The performance of composite polymer materials 1-7 was tested according to the above standards, and the experimental results are shown in Table 2 below: Table 2

[0041] As shown in Table 2, in the falling ball test and magnetic force test, the composite polymer material 1 with added KF showed significantly better performance than the composite polymer material 6. This experimental result indicates that adding KF improved the magnetic field strength and falling ball test performance of the composite polymer material.

[0042] In the falling ball test and magnetic strength test, based on the results of composite polymer materials 1-3 and 5-7, it can be seen that composite polymer material 3 prepared by general method 2 performs better than composite polymer material 7 prepared by general methods 1 and 3. This indicates that the filler premixing process of general method 2 helps to improve dispersibility and has a better synergistic effect with KF, thereby improving the performance of the composite polymer material.

[0043] As can be seen from composite polymer materials 1-5, adding a specific amount of KF (e.g., less than 1 part by weight) helps improve the performance of composite polymer materials. However, when an excessive amount is added (e.g., 2 parts by weight), the magnetic strength of the composite polymer material will decrease and it will easily become brittle at low temperatures. This may be because adding excessive KF may destroy the magnetism of the magnetic powder, which will lead to a decrease in the overall performance of the material.

[0044] In summary, adding an appropriate amount of KF and using specific preparation methods can improve the performance of composite polymer materials, especially magnetic strength and material stability.

[0045] Application Example 2 The composite polymer materials 1-5 of this invention were tested according to the national standard GB / T 18258-2000, Test Method for Damping Materials. A DMA Q800 dynamic thermomechanical analyzer was used in single cantilever mode. The sample size was 35 mm × 10 mm × 1 mm, the heating rate was 3℃ / min, and the frequency was 100 Hz. Each sample was tested three times, and the average value was taken. The test results are shown in Table 3.

[0046] Table 3

[0047] This invention enables the provided composite polymer materials 1-4 to maintain a high loss factor (e.g., loss factor ≥ 0.1) over a wide temperature range from -40℃ to 140℃. The experimental results further demonstrate that an appropriate amount of KF improves the dispersibility of inorganic fillers, enhances interfacial bonding, and increases the orientation and magnetic strength of the magnetic powder; however, excessive KF may damage the surface structure of the magnetic powder through the strong reactivity of fluorine, leading to a decrease in magnetic properties.

[0048] In summary, the composite polymer material provided by this invention not only achieves wide-temperature stability in damping performance, but also exhibits significant advantages in terms of ease of installation, long-term reliability, and overall cost, providing a superior solution for optimizing automotive NVH performance.

Claims

1. A composite polymer material, characterized in that, Its components include SBS modified bitumen, fillers, petroleum resin, EVA, silica, silane coupling agent, SBS styrene-butadiene rubber, and plasticizers. The fillers include magnetic powder and KF.

2. The composite polymer material as described in claim 1, characterized in that, The filler further comprises heavy calcium carbonate and / or mica powder.

3. The composite polymer material as described in claim 1, characterized in that, Based on parts by weight, it meets one or more of the following conditions: 1) The SBS modified bitumen is 6-10 parts by weight; 2) The magnetic powder is in the form of 25-30 parts by weight; 3) The amount of the superphosphate is 30-40 parts by weight; 4) The mica powder is in the form of 25-30 parts by weight; 5) The C9 petroleum resin is 4-7 parts by weight; 6) The EVA content is 0.1~0.3 parts by weight; 7) The silica content is 0.1~0.3 parts by weight; 8) The silane coupling agent is present in an amount of 0.1 to 0.4 parts by weight; 9) The SBS styrene-butadiene rubber is 0.5~1 parts by weight; 10) The plasticizer mentioned is 1 to 2 parts by weight.

4. A method for preparing a composite polymer material as described in any one of claims 1-3, characterized in that, It includes the following steps: S1, SBS modified asphalt, styrene-butadiene rubber, EVA, plasticizer and petroleum resin are heated and mixed evenly to obtain a homogeneous viscoelastic matrix; S2, the homogeneous viscoelastic matrix and filler are sheared and dispersed in a kneader, then a silane coupling agent is added, and after low-speed stirring, the composite masterbatch is obtained by granulation through a twin-screw extruder. The filler includes heavy calcium carbonate, mica powder, KF and magnetic powder. S3, the composite masterbatch is calendered to obtain the composite polymer material.

5. The method for preparing the composite polymer material as described in claim 4, characterized in that, The filler is composed of heavy calcium carbonate, mica powder, magnetic powder and KF.

6. The application of a composite polymer material as described in any one of claims 1-3 in the automotive field.

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