Vibration and noise reduction composite material and preparation method thereof

Abstract

The invention discloses a vibration and noise reduction composite material and a preparation method thereof, and belongs to the technical field of vibration and noise reduction materials. According to the preparation method disclosed by the invention, the elastomer, the chain extender and the inorganic filler with the lamellar structure are adopted as preparation raw materials, mixing and extrusion are performed through a double-screw extruder, and then bonding treatment and annealing treatment are performed, so that the relative molecular mass and the crosslinking density of the elastomer plastic can be effectively increased, and thus the glass-transition temperature range is increased; and in the vibration process, small molecular chain segments are continuously broken and recombined, so that the damping temperature range of the damping material is influenced, and the damping effect of the vibration and noise reduction composite material is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration-damping and noise-reducing materials, and in particular relates to a vibration-damping and noise-reducing composite material and a preparation method thereof. Background Art

[0002] With the rapid development of science and technology, people's requirements for automobile comfort are getting higher and higher. The vibration and noise generated by vehicles during driving have been a problem that has troubled automakers for many years. Especially when driving at high speed or passing through uneven roads, the vibration and noise of the car body will significantly affect the driving experience. In order to improve the comfort of vehicles, automakers are constantly exploring various technical means of vibration reduction and noise reduction. In the traditional automotive industry, one of the most common solutions is to add damping layer materials to the inside of the car steel plate, and absorb vibration energy through the characteristics of the damping material, thereby reducing the resonance amplitude and noise level in the car. The working principle of the damping material is mainly to achieve the vibration reduction effect by converting vibration mechanical energy into heat energy. When the vehicle is driving, the body will be subject to vibration excitation from multiple aspects such as the road surface, engine, and transmission system. These vibrations will be transmitted to the car through the body structure, causing resonance and noise in the car. By adding a damping layer to the inside of the body steel plate, the damping material can effectively absorb these vibration energies and convert them into heat energy to dissipate, thereby reducing the transmission of vibration and the generation of noise. This technology can not only significantly reduce the noise level in the car, but also improve the driving smoothness of the vehicle and improve driving comfort. However, as consumers' requirements for automobile comfort continue to increase, traditional damping material technology is also facing new challenges. First, although traditional damping materials can effectively reduce vibration, they are heavy and will increase the overall weight of the vehicle, thereby affecting fuel economy and power performance. Secondly, with the rapid development of new energy vehicles, especially the popularity of electric vehicles, the vibration source and noise characteristics of vehicles have changed, and traditional damping materials may not be able to fully adapt to new needs. For example, electric vehicles do not have engine noise, but the problems of motors and high-frequency vibrations are more prominent, which puts higher requirements on the performance of damping materials. In order to meet these challenges, car companies and material suppliers are actively developing new damping materials and technologies. For example, the application of new materials such as lightweight composite materials and intelligent damping materials can not only effectively reduce vibration and noise, but also reduce the weight of the vehicle body and improve the energy efficiency of the vehicle. In addition, intelligent damping materials can automatically adjust the damping characteristics according to the driving status and road conditions of the vehicle, further improving the vibration reduction effect. The application of these new technologies will provide more possibilities for improving the comfort of future cars.

[0003] Polymer materials have shown extensive application potential in many fields due to their unique physical and chemical properties. Among them, a significant advantage is that they usually have a high loss factor, which means that these materials can effectively convert mechanical energy into heat or other forms of energy and dissipate it when subjected to external forces. This characteristic makes polymer materials shine in the field of damping and become an ideal choice for preparing high-performance damping materials. At present, the widely used polymer damping materials on the market, such as highly cross-linked rubber composites, use the special movement behavior of polymer segments during the glass transition process to achieve efficient energy consumption. In this process, as the temperature rises, the originally relatively rigid segments begin to gradually gain mobility. When external forces act on the material, these segments will undergo complex movements and friction, thereby converting mechanical energy into heat energy to achieve the effect of damping and vibration reduction. In addition, polymer materials are also easy to process and can be made into products of various shapes and sizes through various molding processes such as injection molding, extrusion, and blow molding, which greatly meets the needs of different application scenarios. Therefore, combined with its advantages of high loss factor and easy processing and molding, polymer damping materials play an irreplaceable role in many fields such as aerospace, automobile manufacturing, building sound insulation, electronic equipment shock absorption, etc., and have made important contributions to improving the comfort and reliability of products.

[0004] The Chinese patent application with publication number CN116656017A discloses a damping composite system and a damping composite material and a preparation method thereof. The material system includes a cross-linked polymer and a non-cross-linked polymer, which are interlaced to form a double network polymer to produce a damping effect. The Chinese patent application with publication number CN117603492A discloses a damping material prepared from a polyurethane elastomer, and the material has a microporous structure, which has a shock-absorbing effect. Although the damping material obtained by the above technical solution can have a good damping and shock-absorbing effect, it has the disadvantages of being difficult to process, poor uniformity, and a narrow effective damping temperature. For damping materials, properties such as good uniformity, easy processing, and a wide damping temperature range are very important. Summary of the invention

[0005] The object of the present invention is to provide a vibration-damping and noise-reducing composite material and a preparation method thereof, so as to solve the technical problem that the effective damping temperature of the damping material is narrow, resulting in poor vibration-damping and noise-reduction.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The invention discloses a method for preparing a vibration-reducing and noise-reducing composite material, comprising the following steps: The elastomer, the chain extender and the lamellar structure inorganic filler are mixed and extruded to obtain an elastomer film; Covering the elastic film on the release paper to obtain a damping layer polymer film; The damping layer polymer film is coated on the surface of the steel plate, and then bonding treatment and annealing treatment are carried out in sequence to obtain a vibration-damping and noise-reducing composite material.

[0007] Furthermore, the weight ratio of the elastomer, the chain extender and the lamellar structure inorganic filler is 100: (0.1-0.5): (0.1-1).

[0008] Furthermore, the elastomer is one or more of thermoplastic elastomer, thermoplastic polyester elastomer, styrene-based thermoplastic elastomer and thermoplastic polyurethane elastomer.

[0009] Furthermore, the chain extender is one or more of 1,4-butanediol, trimethylolpropane, diethylaminoethanol, 3,3'-dichloro-4,4'-diaminodiphenylmethane, diethyltoluenediamine, epoxy chain extender ADR, 1,2-epoxy-4-vinylcyclohexane and 2,3-epoxypropyltrimethylammonium chloride.

[0010] Furthermore, the lamellar structure inorganic filler is one or more of calcium carbonate, talc, clay and mica.

[0011] Furthermore, the thickness of the elastic film is 1-100 μm; the thickness of the steel plate is 0.5-3 mm.

[0012] Furthermore, the steel plate is one of cold-rolled steel and steel-aluminum alloy; the steel plate is cleaned and passivated in sequence before use; the passivation treatment is one or more of pickling passivation, electrochemical passivation and chemical deposition passivation.

[0013] Furthermore, the bonding treatment is performed by hot pressing; the temperature of the hot pressing is 120-180° C., and the time is 10-60 seconds.

[0014] Furthermore, the mixing and extrusion is carried out by a twin-screw extruder; the temperature of the annealing treatment is 50-80° C., and the time is 5-8 hours.

[0015] The invention also discloses a vibration-reducing and noise-reducing composite material prepared by the preparation method.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses a method for preparing a vibration-damping and noise-reducing composite material. The method adopts an elastomer, a chain extender and a lamellar structure inorganic filler as preparation raw materials. The glass transition temperature of the elastomer is increased by blending and modifying the elastomer. The chain extender cooperates with other materials to effectively increase the relative molecular mass and cross-linking density of the elastomer plastic, thereby increasing the glass transition temperature range, causing small molecular chain segments generated during the vibration process to continuously break and recombine, thereby affecting the damping temperature range of the damping material. In addition, the addition of the lamellar structure inorganic filler increases the friction between the chain extender segments, thereby driving the movement of the entire molecular chain, thereby consuming the vibration energy, and greatly improving the damping effect of the vibration-damping and noise-reducing composite material.

[0017] Furthermore, the preparation method disclosed in the present invention is to mix and extrude through a twin-screw extruder, followed by bonding treatment and annealing treatment. This method has low process difficulty, can obtain a vibration-damping and noise-reducing composite material with good uniformity, and has broad application prospects.

[0018] Furthermore, passivation treatment of the steel plate can improve the bonding performance between the damping layer polymer film and the steel plate, thereby improving the peel strength of the vibration-damping and noise-reducing composite material.

[0019] The present invention also discloses a vibration-damping and noise-reducing composite material prepared by the preparation method. Relevant experimental results show that the damping loss factor of the vibration-damping and noise-reducing composite material is 0.2-0.25, and the T-peel strength is 3500-4500 N / m, indicating that the vibration-damping and noise-reducing composite material prepared by the present invention not only has higher damping and vibration reduction performance, but also has higher T-peel strength, which can ensure that the composite material does not separate during the stamping process of preparing structural parts, and can make the structure have higher strength. The composite material is suitable for shock-proof structural parts such as automobiles, electrical appliances, and high-speed railways. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The DSC curves of the materials prepared in Example 1 and Comparative Example 1 of the present invention are shown. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used in the text are the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definition in this specification shall prevail.

[0022] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0023] In this article, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to have included and specifically disclosed all possible secondary ranges and individual values ​​within the range (including integers and fractions).

[0024] In this document, unless otherwise specified, “includes,” “including,” “contains,” “has,” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0025] In this document, in order to make the description concise, not all possible combinations of various technical features in various embodiments or examples are described. Therefore, as long as there is no contradiction in the combination of these technical features, the various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered to be within the scope of this specification.

[0026] Disclosed is a method for preparing a vibration-reducing and noise-reducing composite material, comprising the following steps: The elastomer, chain extender and lamellar inorganic filler are mixed and added into a twin-screw extruder, and the elastomer film is obtained after mixing and extrusion; Covering the elastic film on the release paper to obtain a damping layer polymer film; The damping layer polymer film is coated on the surface of the cleaned and passivated steel plate, and the damping layer polymer film is bonded to the surface of the steel plate by hot pressing, and then annealing is performed to obtain a vibration-damping and noise-reducing composite material.

[0027] Preferably, the elastomer includes one or more of thermoplastic elastomer (TPE), thermoplastic polyester elastomer (TPEE), styrenic thermoplastic elastomer (SBS) and thermoplastic polyurethane elastomer (TPU).

[0028] Preferably, the chain extender is one or more of 1,4-butanediol, trimethylolpropane, diethylaminoethanol, 3,3'-dichloro-4,4'-diaminodiphenylmethane, diethyltoluenediamine, epoxy chain extender ADR, 1,2-epoxy-4-vinylcyclohexane and 2,3-epoxypropyltrimethylammonium chloride.

[0029] Preferably, the lamellar inorganic filler is one or more of calcium carbonate, talc, clay and mica.

[0030] Preferably, the weight ratio of the elastomer, the chain extender and the lamellar structure inorganic filler is 100: (0.1-0.5): (0.1-1).

[0031] Preferably, the thickness of the elastomeric film is 1-100 μm.

[0032] Preferably, the thickness of the steel plate is 0.5-3 mm.

[0033] Preferably, the passivation treatment is one or more of pickling passivation, electrochemical passivation and chemical deposition passivation.

[0034] Preferably, the temperature of the hot pressing treatment is 120-180° C., and the time is 10-60 seconds.

[0035] Preferably, the annealing temperature is 50-80° C. and the time is 5-8 hours.

[0036] The present invention also discloses a vibration-damping and noise-reducing composite material prepared by the above-mentioned preparation method. According to relevant experimental results, the vibration-damping and noise-reducing composite material has a damping loss factor of 0.2-0.25 and a T-peel strength of 3500-4500 N / m, and can be widely used in shock-proof structural parts such as automobiles, electrical appliances, and high-speed railways.

[0037] The method disclosed in the present invention ensures that the material has good elasticity and damping properties by controlling the weight ratio of elastomer, chain extender and lamellar structure inorganic filler to 100: (0.1~0.5): (0.1~1). This optimized ratio enables the composite material to perform well in vibration reduction and noise reduction while maintaining the mechanical strength of the material. Selection of a variety of elastomers and chain extenders: the elastomer can be selected from one or more of thermoplastic elastomer, thermoplastic polyester elastomer, styrene thermoplastic elastomer and thermoplastic polyurethane elastomer, and the chain extender also has a variety of options, such as 1,4-butanediol, trimethylolpropane, etc. This diverse selection allows the material to be adjusted according to specific application requirements, enhancing the applicability and flexibility of the material. The addition of lamellar structure inorganic fillers (such as calcium carbonate, talc, clay and mica) not only improves the mechanical properties of the material, but also enhances the damping properties of the material. These fillers can effectively disperse stress and reduce vibration transmission, thereby improving the vibration reduction effect. The bonding treatment adopts hot pressing treatment, the temperature is 120~180℃, and the time is 10~60s. This treatment method can ensure a strong bond between the damping layer and the steel plate and improve the overall performance of the composite material.

[0038] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0039] The following examples use conventional instruments and equipment in the art. The experimental methods in the following examples where specific conditions are not specified are usually carried out under conventional conditions or under conditions recommended by the manufacturer. The various raw materials used in the following examples are conventional commercial products unless otherwise specified, and their specifications are conventional specifications in the art. In the specification of the present invention and the following examples, unless otherwise specified, "%" means weight percentage, "part" means weight part, and ratio means weight ratio.

[0040] Example 1 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a thermoplastic polyester elastomer, 0.5 parts by weight of an epoxy chain extender ADR, and 0.5 parts by weight of talc are weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 10 μm; After the elastomeric film is rolled up with release paper, it is covered on a 1 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 170°C for 30 seconds to achieve bonding, followed by annealing at 60°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0041] After testing, the loss factor of the vibration-damping and noise-reducing composite material obtained in Example 1 is 0.23, and the T-peel strength is 4500 N / m.

[0042] Example 2 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of thermoplastic polyurethane elastomer, 0.1 parts by weight of 1,4-butanediol, and 0.5 parts by weight of mica powder were weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 1 mm; After the elastomeric film is rolled up with release paper, it is covered on a 1 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 160°C for 60s to achieve bonding, followed by annealing at 60°C for 8h to obtain a vibration-damping and noise-reducing composite material.

[0043] After testing, the loss factor of the vibration-damping and noise-reducing composite material obtained in Example 2 is 0.25, and the T-peel strength is 4200 N / m.

[0044] Example 3 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a thermoplastic polyester elastomer, 0.1 parts by weight of an epoxy chain extender ADR, and 0.1 parts by weight of talc are weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 10 μm; After the elastomeric film is rolled up with release paper, it is covered on a 1 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 170°C for 30 seconds to achieve bonding, followed by annealing at 60°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0045] After testing, the loss factor of the vibration-damping and noise-reducing composite material obtained in Example 3 is 0.20, and the T-peel strength is 4300 N / m.

[0046] Example 4 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.5 parts by weight of 1,2-epoxy-4-vinylcyclohexane, and 0.5 parts by weight of calcium carbonate were weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 10 μm; After the elastomeric film is rolled up with release paper, it is covered on a 1 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 150°C for 30 seconds to achieve bonding, followed by annealing at 50°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0047] After testing, the loss factor of the vibration-damping and noise-reducing composite material obtained in Example 4 is 0.20, and the T-peel strength is 4300 N / m.

[0048] Example 5 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of thermoplastic polyurethane elastomer, 0.1 parts by weight of epoxy chain extender ADR, and 1 part by weight of clay were weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 5 μm; After the elastomeric film is rolled up with release paper, it is covered on a 3 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 120°C for 60s to achieve bonding, followed by annealing at 80°C for 5h to obtain a vibration-damping and noise-reducing composite material.

[0049] Example 6 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of thermoplastic polyurethane elastomer, 0.5 parts by weight of 1,2-epoxy-4-vinylcyclohexane, and 0.1 parts by weight of clay were weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 5 μm; After the elastomeric film is rolled up with release paper, it is coated on a 0.5 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 120°C for 60s to achieve bonding, followed by annealing at 80°C for 5h to obtain a vibration-damping and noise-reducing composite material.

[0050] Example 7 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.4 parts by weight of diethylaminoethanol ADR, and 0.8 parts by weight of mica were weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 10 μm; After the elastomeric film is rolled up with release paper, it is covered on a 1 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 170°C for 30 seconds to achieve bonding, followed by annealing at 60°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0051] Example 8 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.4 parts by weight of 3,3'-dichloro-4,4'-diaminodiphenylmethane, and 0.8 parts by weight of mica are weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 10 μm; After the elastomeric film is rolled up with release paper, it is covered on a 1 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 170°C for 30 seconds to achieve bonding, followed by annealing at 60°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0052] Example 9 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.1 parts by weight of 1,2-epoxy-4-vinylcyclohexane, and 0.8 parts by weight of mica were weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 10 μm; After the elastomeric film is rolled up with release paper, it is covered on a 1 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 170°C for 30 seconds to achieve bonding, followed by annealing at 60°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0053] Example 10 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.1 parts by weight of 1,2-epoxy-4-vinylcyclohexane, and 0.8 parts by weight of mica were weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 10 μm; After the elastomeric film is rolled up with release paper, it is coated on a 1 mm thick cold-rolled steel plate that has been electrochemically passivated, and hot-pressed at 170°C for 30 seconds to achieve bonding. It is then annealed at 60°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0054] Embodiment 11 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.1 parts by weight of 1,2-epoxy-4-vinylcyclohexane, and 0.8 parts by weight of mica were weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 10 μm; After the elastomeric film is rolled up with release paper, it is coated on a 1 mm thick cold-rolled steel plate that has been passivated by chemical deposition, and hot-pressed at 180°C for 10 seconds to achieve bonding. It is then annealed at 60°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0055] Example 12 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.9 parts by weight of 1,2-epoxy-4-vinylcyclohexane, and 0.8 parts by weight of mica were weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 50 μm; After the elastomeric film is rolled up with release paper, it is coated on a 0.6 mm thick cold-rolled steel plate that has been electrochemically passivated, and hot-pressed at 170°C for 30 seconds to achieve bonding. It is then annealed at 60°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0056] Embodiment 13 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.9 parts by weight of 1,2-epoxy-4-vinylcyclohexane, and 0.8 parts by weight of mica were weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 50 μm; After the elastomeric film is rolled up with release paper, it is coated on a 0.6 mm thick cold-rolled steel plate that has been electrochemically passivated, and hot-pressed at 180°C for 10 seconds to achieve bonding. It is then annealed at 65°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0057] Embodiment 14 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.9 parts by weight of 1,2-epoxy-4-vinylcyclohexane, and 0.8 parts by weight of mica were weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 50 μm; After the elastomeric film is rolled up with release paper, it is coated on a 0.6 mm thick cold-rolled steel plate that has been electrochemically passivated, and hot-pressed at 130°C for 10 seconds to achieve bonding. It is then annealed at 70°C for 5 hours to obtain a vibration-damping and noise-reducing composite material.

[0058] Embodiment 15 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.4 parts by weight of 3,3'-dichloro-4,4'-diaminodiphenylmethane, and 0.8 parts by weight of mica are weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 10 μm; After the elastomeric film is rolled up with release paper, it is covered on a 1 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 170°C for 30 seconds to achieve bonding, followed by annealing at 60°C for 7 hours to obtain a vibration-damping and noise-reducing composite material.

[0059] Example 16 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.4 parts by weight of 3,3'-dichloro-4,4'-diaminodiphenylmethane, and 0.8 parts by weight of mica are weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 50 μm; After the elastomeric film is rolled up with release paper, it is covered on a 1 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 175°C for 30 seconds to achieve bonding, followed by annealing at 60°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0060] Embodiment 17 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.4 parts by weight of 3,3'-dichloro-4,4'-diaminodiphenylmethane, and 0.7 parts by weight of mica are weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 10 μm; After the elastomeric film is rolled up with release paper, it is covered on a 1 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 170°C for 30 seconds to achieve bonding, followed by annealing at 60°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0061] Embodiment 18 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.5 parts by weight of 2,3-epoxypropyltrimethylammonium chloride, and 0.8 parts by weight of mica were weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 10 μm; After the elastomeric film is rolled up with release paper, it is covered on a 1 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 170°C for 30 seconds to achieve bonding, followed by annealing at 60°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0062] Embodiment 19 A method for preparing a vibration-reducing and noise-reducing composite material comprises the following steps: 100 parts by weight of a styrene-based thermoplastic elastomer, 0.5 parts by weight of 2,3-epoxypropyltrimethylammonium chloride, and 0.8 parts by weight of mica were weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film with a thickness of 10 μm; After the elastomeric film is rolled up with release paper, it is covered on a 1 mm thick cold-rolled steel plate that has been pickled and passivated, and hot-pressed at 145°C for 55 seconds to achieve bonding, followed by annealing at 60°C for 6 hours to obtain a vibration-damping and noise-reducing composite material.

[0063] Comparative Example 1 A method for preparing a damping composite material comprises the following steps: 100 parts by weight of a thermoplastic polyester elastomer and 0.5 parts by weight of talc are weighed, mixed, and added into a twin-screw extruder, and mixed and extruded to obtain an elastomer film material with a thickness of 10 μm; The elastomeric film material was rolled up with release paper and then covered on a 1 mm thick steel plate that had been pickled and passivated. It was then hot-pressed at 170°C for 30 seconds to achieve bonding, and then annealed at 60°C for 6 hours to obtain a damping composite material.

[0064] After testing, the loss factor of the damping composite material obtained in Comparative Example 1 is 0.17, and the T-peel strength is 3300 N / m.

[0065] Comparative Example 2 A method for preparing a damping composite material comprises the following steps: 100 parts by weight of a thermoplastic polyester elastomer and 0.5 parts by weight of an epoxy chain extender ADR are weighed, mixed, and added into a twin-screw extruder, and after mixing and extrusion, an elastomer film material with a thickness of 10 μm is obtained; The elastomeric film material was rolled up with release paper and then covered on a 1 mm thick cold-rolled steel plate after pickling and passivation. It was hot-pressed at 170°C for 30s to achieve bonding, and then annealed at 60°C for 6h to obtain a damping composite material.

[0066] After testing, the loss factor of the damping composite material obtained in Comparative Example 2 is 0.19, and the T-peel strength is 4500 N / m.

[0067] From the above test results, it can be seen that in Example 1, the thermoplastic polyester elastomer was not chain extended and modified, and the friction between the molecular segments was correspondingly reduced. In Example 2, lamellar inorganic particles were added, and the friction loss of the corresponding damping layer was reduced, thereby reducing the loss factor.

[0068] Figure 1 1 and 1 are DSC curves of the materials prepared in Example 1 and Comparative Example 1 of the present invention. It can be seen from the figure that the growth of the chain segments of the chain-extended TPEE increases the glass transition temperature and melting point of the material accordingly, so that the material has better chemical resistance and heat resistance in application, and the growth of the chain segments can effectively increase the relative molecular mass and the degree of cross-linking, which can further promote energy absorption and improve the loss factor of the material.

[0069] The method disclosed in the present invention has a well-designed formula and preparation process, and the vibration-reducing and noise-reducing composite material exhibits excellent damping performance, and its damping loss factor is as high as 0.2~0.25, which is significantly higher than many traditional damping materials, which means that the material has higher efficiency in vibration and noise control. By closely combining the damping layer polymer film with the specially treated steel plate, not only the overall structural strength of the composite material is improved, but also the firm bonding between the damping layer and the substrate is ensured, and the service life of the product is extended. The use of a twin-screw extruder for mixing and extrusion simplifies the production process and improves production efficiency. At the same time, the elastomer film is easy to cover on the release paper, which is convenient for subsequent processing and molding, and reduces production costs. The types of elastomers, chain extenders and lamellar inorganic fillers are diverse, and can be flexibly adjusted according to the needs of specific application scenarios to meet the special requirements of different customers for material performance. The selected materials are all environmentally friendly materials, and no harmful substances are produced during the preparation process, which meets the requirements of modern industry for environmental protection and sustainable development. Due to the excellent damping performance and structural strength of this composite material, it can be widely used in many fields such as automobiles, aerospace, construction, electronic equipment, etc., providing an effective solution for vibration and noise control.

[0070] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing a vibration-reducing and noise-reducing composite material, characterized in that: The following steps are involved: The elastomer, the chain extender and the lamellar structure inorganic filler are mixed and extruded to obtain an elastomer film; Covering the elastic film on the release paper to obtain a damping layer polymer film; The damping layer polymer film is coated on the surface of the steel plate, and then bonding treatment and annealing treatment are carried out in sequence to obtain a vibration-damping and noise-reducing composite material.

2. The method for preparing a vibration-reducing and noise-reducing composite material according to claim 1, characterized in that: The weight ratio of the elastomer, the chain extender and the lamellar structure inorganic filler is 100: (0.1-0.5): (0.1-1).

3. The method for preparing a vibration-reducing and noise-reducing composite material according to claim 1, characterized in that: The elastomer is one or more of thermoplastic elastomer, thermoplastic polyester elastomer, styrene-based thermoplastic elastomer and thermoplastic polyurethane elastomer.

4. The method for preparing a vibration-reducing and noise-reducing composite material according to claim 1, characterized in that: The chain extender is one or more of 1,4-butanediol, trimethylolpropane, diethylaminoethanol, 3,3'-dichloro-4,4'-diaminodiphenylmethane, diethyltoluenediamine, epoxy chain extender ADR, 1,2-epoxy-4-vinylcyclohexane and 2,3-epoxypropyltrimethylammonium chloride.

5. The method for preparing a vibration-damping and noise-reducing composite material according to claim 1, characterized in that: The lamellar structure inorganic filler is one or more of calcium carbonate, talcum powder, clay and mica.

6. The method for preparing a vibration-damping and noise-reducing composite material according to claim 1, characterized in that: The thickness of the elastic film is 1-100 μm; the thickness of the steel plate is 0.5-3 mm.

7. The method for preparing a vibration-damping and noise-reducing composite material according to claim 1, characterized in that: The steel plate is one of cold-rolled steel and steel-aluminum alloy; before use, the steel plate is cleaned and passivated in sequence; the passivation treatment is one or more of pickling passivation, electrochemical passivation and chemical deposition passivation.

8. The method for preparing a vibration-reducing and noise-reducing composite material according to claim 1, characterized in that: The bonding treatment is performed by hot pressing; the temperature of the hot pressing is 120-180° C. and the time is 10-60 seconds.

9. The method for preparing a vibration-damping and noise-reducing composite material according to claim 1, characterized in that: The mixing and extrusion is carried out by a twin-screw extruder; the temperature of the annealing treatment is 50-80° C. and the time is 5-8 hours.

10. A vibration and noise reduction composite material, characterized in that: The vibration-damping and noise-reducing composite material is prepared by the preparation method described in any one of claims 1 to 9; the damping loss factor of the vibration-damping and noise-reducing composite material is 0.2 to 0.25, and the T-peel strength is 3500 to 4500 N / m.

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