High damping polystyrene-polypropylene alloy material, preparation method thereof and air conditioner chassis

Abstract

The application relates to the technical field of resin material modification, and provides a high-damping polystyrene-polypropylene alloy material, a preparation method thereof and an air conditioner base. The preparation raw material of the high-damping polystyrene-polypropylene alloy material comprises the following components by weight: 55-75 parts of polystyrene resin; 10-20 parts of polypropylene resin; 3-8 parts of a compatilizer; 5-10 parts of damping rubber; 0.1-0.3 parts of a crosslinking agent; 0.2-0.6 parts of an antioxidant; and 5-15 parts of a filler. The polystyrene-polypropylene alloy material has excellent damping performance and strength, and has excellent overall performance; the air conditioner base prepared from the material can significantly reduce the number of abnormal sounds, and the screw assembly process is not slippery.

Description

Technical Field

[0001] This invention relates to the field of resin material modification technology, and in particular to a high-damping polystyrene-polypropylene alloy material, its preparation method, and an air conditioning chassis. Background Technology

[0002] The chassis of household wall-mounted air conditioners is generally made of high-impact polystyrene (HIPS) or ABS. Since the air conditioner frame is also made of the same material as the chassis and HIPS material itself has poor damping performance, it may slip and make abnormal noises at the mounting points during the air conditioner's on / off process, affecting the user experience.

[0003] Currently, the solution to the aforementioned thermal expansion and contraction noise is to apply a felt cloth to the joint area before chassis assembly to prevent direct contact between the plastic parts and the joint. While this method can reduce the frequency of noise to some extent, it is labor-intensive, impacting overall assembly efficiency and hindering automated production. Conventional material solutions involve adding high-damping components to the formulation to improve material damping performance. These methods can improve damping performance to some extent, but due to the low strength of the damping components, the overall material strength is low, leading to screw slippage issues when used in the chassis. Therefore, the challenge lies in developing a high-damping material that meets the screw torque requirements of chassis components, achieving or exceeding the noise reduction achieved with the existing HIPS chassis with felt cloth application without the need for added foam. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in the prior art. Therefore, one object of this invention is to provide a high-damping polystyrene-polypropylene alloy material, its preparation method, and an air conditioning chassis.

[0005] In a first aspect, the present invention provides a high-damping polystyrene-polypropylene alloy material. The raw materials for preparing this material include:

[0006] 55-75 parts by weight of polystyrene resin;

[0007] 10-20 parts by weight of polypropylene resin;

[0008] 3-8 parts by weight of compatibilizer;

[0009] 5-10 parts by weight of damping rubber;

[0010] 0.1-0.3 parts by weight of crosslinking agent;

[0011] 0.2-0.6 parts by weight of antioxidant;

[0012] 5-15 parts by weight of filler.

[0013] The high-damping polystyrene-polypropylene alloy material of this invention, using a blend of polystyrene resin and polypropylene resin, significantly improves the material's damping performance and reduces the frequency of abnormal noises. Simultaneously, by adding compatibilizers, damping rubber, crosslinking agents, and antioxidants, the compatibilizer and damping rubber crosslink under the action of the crosslinking agent, thereby improving the material's damping performance and toughening effect. The antioxidant controls the degree of crosslinking, thus improving the overall performance of the material. Furthermore, by adding fillers, the fillers can synergistically blend with polypropylene to improve the alloy material's shrinkage performance, imparting higher strength and reducing screw stripping rates. By blending polystyrene resin, polypropylene resin, compatibilizers, damping rubber, crosslinking agents, antioxidants, and fillers, the material's damping performance, strength, and overall performance can be significantly improved, reducing the frequency of abnormal noises from the air conditioning chassis and ensuring that screws do not strip during assembly.

[0014] Therefore, this polystyrene-polypropylene alloy material has excellent damping performance and strength, and excellent overall performance. Using this material to manufacture air conditioner chassis can significantly reduce the frequency of abnormal noises, and prevent screw stripping during assembly.

[0015] According to the high-damping polystyrene-polypropylene alloy material provided by the present invention, the polystyrene resin includes high-impact polystyrene.

[0016] The high-damping polystyrene-polypropylene alloy material provided by the present invention includes homopolymer polypropylene as the polypropylene resin.

[0017] The high-damping polystyrene-polypropylene alloy material provided by the present invention includes a styrene block copolymer as the compatibilizer.

[0018] The high-damping polystyrene-polypropylene alloy material provided by the present invention includes at least one of nitrile rubber, chloroprene rubber, and methyl silicone rubber.

[0019] The high-damping polystyrene-polypropylene alloy material provided by the present invention includes at least one of dicumyl peroxide, di-tert-butyl peroxide, bis-tert-butyl peroxide, benzoyl peroxide, and lauroyl peroxide.

[0020] The high-damping polystyrene-polypropylene alloy material provided by the present invention includes at least one of barium sulfate, talc, wollastonite, and glass fiber as the filler.

[0021] The high-damping polystyrene-polypropylene alloy material provided by the present invention includes at least one of antioxidants 1010, 168, 1076, and 164.

[0022] The high-damping polystyrene-polypropylene alloy material provided by the present invention includes at least one of styrene-butadiene-styrene block copolymer and styrene-ethylene-butene-styrene block copolymer.

[0023] According to the high-damping polystyrene-polypropylene alloy material provided by the present invention, the homopolymer polypropylene has a melt index of 3-8 g / 10 min and a tensile strength ≥35 MPa under the test conditions of 230°C and 2.16 kg.

[0024] The high-damping polystyrene-polypropylene alloy material provided by the present invention further includes 0.5-1 parts by weight of lubricant as a raw material.

[0025] The high-damping polystyrene-polypropylene alloy material provided by the present invention includes a silicone masterbatch as the lubricant.

[0026] In a second aspect, the present invention provides a method for preparing the above-mentioned high-damping polystyrene-polypropylene alloy material. The method includes:

[0027] (1) After heating and mixing the compatibilizer, damping rubber, crosslinking agent and antioxidant, the mixture is hot-cut into pellets to obtain micro-crosslinked damping masterbatch;

[0028] (2) The micro-crosslinked damping masterbatch, polystyrene resin, polypropylene resin and filler are mixed and extruded to obtain a high-damping polystyrene-polypropylene alloy material.

[0029] The present invention provides a method for preparing the aforementioned high-damping polystyrene-polypropylene alloy material. First, a compatibilizer, damping rubber, crosslinking agent, and antioxidant are heated and blended, followed by hot pelletizing. Compared to existing processes that involve mixing and extruding all materials at once, this method first heat-blends the compatibilizer, damping rubber, crosslinking agent, and antioxidant. This heating and blending process causes the compatibilizer and damping rubber to undergo micro-crosslinking under the action of the crosslinking agent, resulting in a micro-crosslinked damping masterbatch. By adding an antioxidant, the degree of crosslinking between the compatibilizer and damping rubber can be controlled, preventing excessive crosslinking and improving the damping performance and overall material properties of the alloy. This micro-crosslinked damping masterbatch significantly improves the high-damping effect of the material and also acts as a compatibilizer, providing good interfacial compatibility. Then, the micro-crosslinked damping masterbatch, polystyrene resin, polypropylene resin, and filler are mixed and extruded to obtain the high-damping polystyrene-polypropylene alloy material. Therefore, this method can prepare high-damping, high-strength polystyrene-polypropylene alloy materials. Furthermore, this method is simple, easy to implement, requires minimal equipment investment, and has low cost.

[0030] According to the method for preparing the above-mentioned high-damping polystyrene-polypropylene alloy material according to the present invention, in step (1), the heating and blending temperature is 170-200℃ and the time is 3min-5min.

[0031] According to the method for preparing the above-mentioned high-damping polystyrene-polypropylene alloy material of the present invention, in step (2), the extrusion temperature is 180-210℃.

[0032] According to the method for preparing the above-mentioned high-damping polystyrene-polypropylene alloy material of the present invention, the extrusion is carried out using a twin-screw extruder, wherein the length-to-diameter ratio of the screw of the twin-screw extruder is (36-40):1, and the screw speed is 300-500 rpm.

[0033] According to the method for preparing the above-mentioned high-damping polystyrene-polypropylene alloy material according to the present invention, in step (2), the micro-crosslinked damping masterbatch, the polystyrene resin, the polypropylene resin, the filler, and the lubricant are mixed and extruded.

[0034] In a third aspect, the present invention provides an air conditioner chassis. This air conditioner chassis is injection molded from the aforementioned high-damping polystyrene-polypropylene alloy material. Consequently, the air conditioner chassis exhibits a low frequency of abnormal noises and the screws do not strip during assembly. Detailed Implementation

[0035] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

[0036] In a first aspect, the present invention provides a high-damping polystyrene-polypropylene alloy material. According to embodiments of the present invention, the raw materials for preparing this material include:

[0037] 55-75 parts by weight of polystyrene resin;

[0038] 10-20 parts by weight of polypropylene resin;

[0039] 3-8 parts by weight of compatibilizer;

[0040] 5-10 parts by weight of damping rubber;

[0041] 0.1-0.3 parts by weight of crosslinking agent;

[0042] 0.2-0.6 parts by weight of antioxidant;

[0043] 5-15 parts by weight of filler.

[0044] The high-damping polystyrene-polypropylene alloy material of the present invention, using a blend of polystyrene resin and polypropylene resin, can significantly improve the damping performance of the material and reduce the frequency of abnormal noises. Simultaneously, by adding compatibilizers, damping rubber, crosslinking agents, and antioxidants, the compatibilizer and damping rubber crosslink under the action of the crosslinking agent, thereby improving the damping performance and toughening effect of the material. The addition of antioxidants can control the degree of crosslinking between the compatibilizer and damping rubber, preventing excessive crosslinking and improving the damping performance and overall performance of the alloy material. Furthermore, by adding fillers, the fillers can synergistically blend with polypropylene, improving the shrinkage performance of the alloy material, giving it higher strength, and reducing the rate of screw stripping. By blending polystyrene resin, polypropylene resin, compatibilizers, damping rubber, crosslinking agents, antioxidants, and fillers, the damping performance, strength, and overall performance of the material can be significantly improved, reducing the frequency of abnormal noises from the air conditioning chassis and ensuring that screws do not strip during assembly.

[0045] Specifically, the inventors discovered that, based on the total amount of material and using polystyrene resin as the base resin, if too much polypropylene resin is added, the material becomes too soft overall, making screws prone to slippage; if too little polypropylene resin is added, a good damping effect cannot be achieved. If too much compatibilizer is added, the material strength is too low, making screws prone to slippage; if too little compatibilizer is added, the compatibility between components is poor, and delamination will occur during injection molding. If too much damping rubber is added, the material strength is too low overall, making screws prone to slippage; if too little damping rubber is added, it cannot provide good damping and noise reduction. If too much crosslinking agent is added, over-crosslinking occurs, leading to a decrease in damping effect; if too little crosslinking agent is added, insufficient crosslinking occurs, and compatibility and damping performance will also decrease. If too much antioxidant is added, it will inhibit the crosslinking reaction, reduce the degree of crosslinking, and thus affect damping performance; if too little antioxidant is added, over-crosslinking occurs, resulting in poor damping effect. If too much filler is added, the material becomes too brittle, resulting in insufficient overall performance; if too little filler is added, it cannot match the shrinkage rate of existing materials, leading to deviations in chassis dimensions.

[0046] Therefore, this polystyrene-polypropylene alloy material has excellent damping performance and strength. Using this material to manufacture air conditioner chassis can significantly reduce the frequency of abnormal noises and prevent screw stripping during assembly.

[0047] Crosslinking agents are conventional reagents in the art, and those skilled in the art can select them according to actual needs. For example, crosslinking agents include, but are not limited to, dicumyl peroxide, di-tert-butyl peroxide, bis-tert-butyl peroxide, benzoyl peroxide, and lauroyl peroxide.

[0048] According to embodiments of the present invention, the compatibilizer comprises a styrene block copolymer. The inventors have discovered that using a styrene block copolymer as a compatibilizer allows for better crosslinking with damping rubber, thereby improving the damping performance of the alloy material.

[0049] According to embodiments of the present invention, styrene block copolymers include, but are not limited to, styrene-butadiene-styrene block copolymers and styrene-ethylene-butene-styrene block copolymers.

[0050] According to embodiments of the present invention, the damping rubber includes at least one of nitrile rubber, chloroprene rubber, and methyl silicone rubber.

[0051] According to embodiments of the present invention, the polystyrene resin includes high-impact polystyrene. Using high-impact polystyrene can improve the damping properties of the material.

[0052] According to an embodiment of the present invention, the polypropylene resin comprises homopolymer polypropylene.

[0053] According to an embodiment of the present invention, the homopolymer polypropylene has a melt index of 3-8 g / 10 min and a tensile strength ≥35 MPa under test conditions of 230°C and 2.16 kg. The aforementioned homopolymer polypropylene has high tensile strength, ensuring excellent shrinkage and compatibility with existing HIPS (high-impact polystyrene) molds, eliminating the need for new molds and reducing material switching costs. Simultaneously, the high tensile strength of the homopolymer polypropylene imparts higher strength to the alloy material, further ensuring that the screws on the air conditioner chassis do not strip during assembly.

[0054] According to embodiments of the present invention, antioxidants include, but are not limited to, antioxidant 1010, antioxidant 168, antioxidant 1076, and antioxidant 164.

[0055] According to embodiments of the present invention, the fillers include, but are not limited to, barium sulfate, talc, wollastonite, and glass fiber.

[0056] According to an embodiment of the present invention, 0.5-1 parts by weight of lubricant are prepared from the raw materials. Adding lubricant improves the compatibility of the substrate, prevents precipitation during injection molding, effectively reduces the friction coefficient at the joint, and further reduces the frequency of abnormal noises from the air conditioning chassis.

[0057] According to embodiments of the present invention, the lubricant comprises silicone masterbatch. Preferably, the lubricant comprises polypropylene-based silicone masterbatch. This significantly improves the compatibility of the substrate, reduces the coefficient of friction, and lowers the frequency of abnormal noise.

[0058] In a second aspect, the present invention provides a method for preparing the above-mentioned high-damping polystyrene-polypropylene alloy material. According to an embodiment of the present invention, the method includes:

[0059] S100: Heat-blended pellets made by mixing compatibilizer, damping rubber, crosslinking agent, and antioxidant.

[0060] In this step, the compatibilizer, damping rubber, crosslinking agent, and antioxidant are heated and blended before being hot-cut into pellets. Compared to the existing process of mixing and extruding all materials at once, this application first heats and blends the compatibilizer, damping rubber, crosslinking agent, and antioxidant. Through heating and blending, the compatibilizer and damping rubber undergo micro-crosslinking under the action of the crosslinking agent to obtain micro-crosslinked damping masterbatch. By adding antioxidant, the degree of crosslinking of the compatibilizer and damping rubber can be controlled to prevent excessive crosslinking and improve the damping performance and overall performance of the alloy material. The aforementioned micro-crosslinked damping masterbatch significantly improves the high damping effect of the material on the one hand, and on the other hand, it can act as a compatibilizer to provide good interfacial compatibility.

[0061] Furthermore, the compatibilizer, damping rubber, crosslinking agent, and antioxidant are mixed evenly in a mixing pot before being heated and blended. The equipment used for heating and blending is conventional equipment in the field, such as an internal mixer.

[0062] According to embodiments of the present invention, the heating and blending temperature is 170-200℃, and the time is 3-5 minutes. For example, temperatures can be 170℃, 175℃, 180℃, 185℃, 190℃, 195℃, 200℃, etc., and times can be 3 minutes, 3.5 minutes, 4 minutes, 4.5 minutes, 5 minutes, etc. By controlling the heating and blending temperature and time within the above range, the mixing effect and the degree of crosslinking reaction can be effectively guaranteed to be within the ideal range.

[0063] S200: The micro-crosslinked damping masterbatch, polystyrene resin, polypropylene resin and filler are mixed and extruded.

[0064] In this step, the above-mentioned micro-crosslinked damping masterbatch, polystyrene resin, polypropylene resin and filler are mixed and extruded to obtain a high-damping polystyrene-polypropylene alloy material.

[0065] Preferably, the extrusion is performed using a twin-screw extruder, wherein the length-to-diameter ratio of the screw of the twin-screw extruder is (36-40):1, and the screw speed is 300-500 rpm.

[0066] According to an embodiment of the present invention, the extrusion temperature is 180-210°C. For example, the extrusion temperature is 180°C, 190°C, 200°C, 210°C, etc.

[0067] According to an embodiment of the present invention, micro-crosslinked damping masterbatch, polystyrene resin, polypropylene resin, filler, and lubricant are mixed and extruded.

[0068] Therefore, this method can be used to prepare high-damping, high-strength polystyrene-polypropylene alloy materials. Furthermore, the method is simple, easy to implement, requires minimal equipment investment, and is low-cost. It should be noted that the characteristics and advantages described above for high-damping polystyrene-polypropylene alloy materials also apply to this method, and will not be repeated here.

[0069] In a third aspect, the present invention provides an air conditioner chassis. According to an embodiment of the invention, the air conditioner chassis is injection molded from the aforementioned high-damping polystyrene-polypropylene alloy material. Therefore, the air conditioner chassis exhibits a low frequency of abnormal noises and the screws do not strip during assembly. It should be noted that the features and advantages described above for the high-damping polystyrene-polypropylene alloy material and its preparation method also apply to this air conditioner chassis, and will not be repeated here.

[0070] Where specific techniques or conditions are not specified in the examples, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.

[0071] The raw materials for the alloy materials used in the examples and comparative examples are detailed in Table 1.

[0072] The preparation process of the alloy materials in the examples and comparative examples is as follows:

[0073] (1) Weigh the compatibilizer, damping rubber, crosslinking agent and antioxidant according to the weight ratio and mix them evenly in a mixing pot to obtain a mixture;

[0074] (2) The above mixture is heated and blended in an internal mixer at a temperature of 180°C for 4 minutes. After blending, the mixture is hot-cut into micro-crosslinked damping masterbatch.

[0075] (3) The above-mentioned micro-crosslinked damping masterbatch, polystyrene resin, polypropylene resin, filler and lubricant are mixed in proportion and then extruded and pelletized using a twin-screw extruder at 180-200℃. The screw length-to-diameter ratio is 36:1 and the screw speed is 400rpm.

[0076] The performance of the alloy materials obtained in the examples and comparative examples, as well as the air conditioning chassis made using the alloy materials, was measured, as follows:

[0077] (1) Cantilever beam notch impact test

[0078] Refer to standard GB / T 1843-2008.

[0079] (2) Bending strength test

[0080] Refer to standard GB / T 9341-2000.

[0081] (3) Bending modulus test

[0082] Refer to standard GB / T 9341-2000.

[0083] (4) Tensile strength

[0084] Refer to standard GB / T 1040.1-2018.

[0085] (5) Damping factor

[0086] Refer to standard GB / T 40396-2021.

[0087] (6) Screw torque

[0088] Following the enterprise standard, after injection molding the chassis sample using alloy material, assemble it with the face frame 10 times continuously using a torque of 1.0 N·m, and observe whether the threads slip.

[0089] (7) Number of abnormal noises

[0090] Referring to the enterprise standard (quantified by the number of times, without requiring the volume of the sound, the enterprise standard requires that the number of abnormal noises during power-on and power-off be within 25 times), after the chassis sample is injection molded using alloy material, the whole machine is assembled and tested. The number of abnormal noises occurring within 10 minutes after power-on and 10 minutes after power-off is recorded by playback of the audio. The sum of the number of abnormal noises during power-on and power-off is recorded as the total number of abnormal noises.

[0091] Table 1 shows the raw materials for preparing the alloy materials in Examples 1-7 and the performance test results of the air conditioning chassis prepared using the alloy materials.

[0092] Table 1

[0093]

[0094] HIPS—Polystyrene resin; PP—Homopolymer polypropylene resin (melt index 3.5 at 230℃, 2.16kg, tensile strength 37MPa); SBS—Styrene-butadiene-styrene block copolymer; SEBS—Styrene-ethylene-butene-styrene block copolymer; DCP—Dicumyl peroxide; DTBP—Di-tert-butyl peroxide.

[0095] Table 2 shows the raw materials for the alloy materials of Comparative Examples 1-7 and the performance test results of the air conditioning chassis made using the alloy materials.

[0096] Table 2

[0097]

[0098] As shown in Tables 1 and 2, compared with Examples 1-7 and Comparative Example 1, the damping performance of the materials in Examples 1-7 is significantly improved compared with existing HIPS materials, and the total number of abnormal noises during power-on and power-off is greatly reduced. Comparing Examples 2 and Comparative Examples 2-3, it is shown that adding only a compatibilizer without adding damping rubber cannot guarantee good damping performance; furthermore, without adding a filler, screw stripping can occur. Comparing Examples 1 and Comparative Example 4, although Comparative Example 4 has good damping performance, the lack of filler leads to screw stripping, failing to meet the chassis usage requirements. Comparing Examples 6 and Comparative Examples 5-6, Comparative Example 5 added too little antioxidant, resulting in over-crosslinking during the preparation of the micro-crosslinked damping masterbatch; Comparative Example 6 added too much antioxidant, resulting in insufficient crosslinking during the preparation of the micro-crosslinked damping masterbatch, indicating that the amount of antioxidant added affects the overall material performance. Comparing Examples 7 and Comparative Example 7, excessive addition of crosslinking agent also leads to over-crosslinking during the preparation of the micro-crosslinked damping masterbatch, affecting the overall material performance.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing high-damping polystyrene-polypropylene alloy materials, characterized in that, include: The raw materials for preparation include: The homopolymer polypropylene resin has a melt index of 3.5 and a tensile strength of 37 MPa at 230°C and 2.16 kg. Preparation methods include: (1) Weigh the compatibilizer, damping rubber, crosslinking agent and antioxidant according to the weight ratio and mix them evenly in a mixing pot to obtain a mixture. (2) The mixture is heated and blended in an internal mixer at a temperature of 180°C for 4 minutes. After blending, the mixture is hot-cut into micro-crosslinked damping masterbatch. (3) The micro-crosslinked damping masterbatch, polystyrene resin, polypropylene resin, filler and lubricant are mixed in proportion and then extruded and pelletized using a twin-screw extruder at 180-200℃ to obtain the high-damping polystyrene-polypropylene alloy material; the screw length-to-diameter ratio of the twin-screw extruder is 36:1 and the screw speed is 400rpm. The properties of the high-damping polystyrene-polypropylene alloy material are as follows:

2. A method for preparing high-damping polystyrene-polypropylene alloy materials, characterized in that, include: The raw materials for preparation include: The homopolymer polypropylene resin has a melt index of 3.5 and a tensile strength of 37 MPa at 230°C and 2.16 kg. Preparation methods include: (1) Weigh the compatibilizer, damping rubber, crosslinking agent and antioxidant according to the weight ratio and mix them evenly in a mixing pot to obtain a mixture. (2) The mixture is heated and blended in an internal mixer at a temperature of 180°C for 4 minutes. After blending, the mixture is hot-cut into micro-crosslinked damping masterbatch. (3) The micro-crosslinked damping masterbatch, polystyrene resin, polypropylene resin, filler and lubricant are mixed in proportion and then extruded and pelletized using a twin-screw extruder at 180-200℃ to obtain the high-damping polystyrene-polypropylene alloy material; the screw length-to-diameter ratio of the twin-screw extruder is 36:1 and the screw speed is 400rpm. The properties of the high-damping polystyrene-polypropylene alloy material are as follows:

3. A method for preparing high-damping polystyrene-polypropylene alloy materials, characterized in that, include: The raw materials for preparation include: The homopolymer polypropylene resin has a melt index of 3.5 and a tensile strength of 37 MPa at 230°C and 2.16 kg. Preparation methods include: (1) Weigh the compatibilizer, damping rubber, crosslinking agent and antioxidant according to the weight ratio and mix them evenly in a mixing pot to obtain a mixture. (2) The mixture is heated and blended in an internal mixer at a temperature of 180°C for 4 minutes. After blending, the mixture is hot-cut into micro-crosslinked damping masterbatch. (3) The micro-crosslinked damping masterbatch, polystyrene resin, polypropylene resin, filler and lubricant are mixed in proportion and then extruded and pelletized using a twin-screw extruder at 180-200℃ to obtain the high-damping polystyrene-polypropylene alloy material; the screw length-to-diameter ratio of the twin-screw extruder is 36:1 and the screw speed is 400rpm. The properties of the high-damping polystyrene-polypropylene alloy material are as follows:

4. A method for preparing high-damping polystyrene-polypropylene alloy materials, characterized in that, include: The raw materials for preparation include: The homopolymer polypropylene resin has a melt index of 3.5 and a tensile strength of 37 MPa at 230°C and 2.16 kg. Preparation methods include: (1) Weigh the compatibilizer, damping rubber, crosslinking agent and antioxidant according to the weight ratio and mix them evenly in a mixing pot to obtain a mixture. (2) The mixture is heated and blended in an internal mixer at a temperature of 180°C for 4 minutes. After blending, the mixture is hot-cut into micro-crosslinked damping masterbatch. (3) The micro-crosslinked damping masterbatch, polystyrene resin, polypropylene resin, filler and lubricant are mixed in proportion and then extruded and pelletized using a twin-screw extruder at 180-200℃ to obtain the high-damping polystyrene-polypropylene alloy material; the screw length-to-diameter ratio of the twin-screw extruder is 36:1 and the screw speed is 400rpm. The properties of the high-damping polystyrene-polypropylene alloy material are as follows:

5. A method for preparing high-damping polystyrene-polypropylene alloy materials, characterized in that, include: The raw materials for preparation include: The homopolymer polypropylene resin has a melt index of 3.5 and a tensile strength of 37 MPa at 230°C and 2.16 kg. Preparation methods include: (1) Weigh the compatibilizer, damping rubber, crosslinking agent and antioxidant according to the weight ratio and mix them evenly in a mixing pot to obtain a mixture. (2) The mixture is heated and blended in an internal mixer at a temperature of 180°C for 4 minutes. After blending, the mixture is hot-cut into micro-crosslinked damping masterbatch. (3) The micro-crosslinked damping masterbatch, polystyrene resin, polypropylene resin, filler and lubricant are mixed in proportion and then extruded and pelletized using a twin-screw extruder at 180-200℃ to obtain the high-damping polystyrene-polypropylene alloy material; the screw length-to-diameter ratio of the twin-screw extruder is 36:1 and the screw speed is 400rpm. The properties of the high-damping polystyrene-polypropylene alloy material are as follows:

6. A method for preparing high-damping polystyrene-polypropylene alloy materials, characterized in that, include: The raw materials for preparation include: The homopolymer polypropylene resin has a melt index of 3.5 and a tensile strength of 37 MPa at 230°C and 2.16 kg. Preparation methods include: (1) Weigh the compatibilizer, damping rubber, crosslinking agent and antioxidant according to the weight ratio and mix them evenly in a mixing pot to obtain a mixture. (2) The mixture is heated and blended in an internal mixer at a temperature of 180°C for 4 minutes. After blending, the mixture is hot-cut into micro-crosslinked damping masterbatch. (3) The micro-crosslinked damping masterbatch, polystyrene resin, polypropylene resin, filler and lubricant are mixed in proportion and then extruded and pelletized using a twin-screw extruder at 180-200℃ to obtain the high-damping polystyrene-polypropylene alloy material; the screw length-to-diameter ratio of the twin-screw extruder is 36:1 and the screw speed is 400rpm. The properties of the high-damping polystyrene-polypropylene alloy material are as follows:

7. A method for preparing high-damping polystyrene-polypropylene alloy materials, characterized in that, include: The raw materials for preparation include: The homopolymer polypropylene resin has a melt index of 3.5 and a tensile strength of 37 MPa at 230°C and 2.16 kg. Preparation methods include: (1) Weigh the compatibilizer, damping rubber, crosslinking agent and antioxidant according to the weight ratio and mix them evenly in a mixing pot to obtain a mixture. (2) The mixture is heated and blended in an internal mixer at a temperature of 180°C for 4 minutes. After blending, the mixture is hot-cut into micro-crosslinked damping masterbatch. (3) The micro-crosslinked damping masterbatch, polystyrene resin, polypropylene resin, filler and lubricant are mixed in proportion and then extruded and pelletized using a twin-screw extruder at 180-200℃ to obtain the high-damping polystyrene-polypropylene alloy material; the screw length-to-diameter ratio of the twin-screw extruder is 36:1 and the screw speed is 400rpm. The properties of the high-damping polystyrene-polypropylene alloy material are as follows:

8. An air conditioning chassis, characterized in that, The high-damping polystyrene-polypropylene alloy material prepared by any one of claims 1-7 is obtained by injection molding.

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