Sound absorption and insulation composite material and preparation method thereof

Abstract

The invention discloses a sound-absorbing and sound-insulating composite material and a preparation method thereof.The preparation method comprises the steps that polyester fibers are subjected to opening and carding to form a net, then hot melt adhesive powder is sprayed, hot press forming is conducted, and a polyester fiber layer is obtained; stirring and uniformly mixing the modified butyl rubber, polyether polyol, polyester polyol, deionized water, an amine catalyst and an organic tin catalyst, then adding isocyanate, and continuously stirring and uniformly mixing to obtain a mixture; butyl rubber, polyisobutene, petroleum resin, barium sulfate and polyester staple fibers are mixed and pressed into sheets, and mixed sheets are obtained; the polyester fiber layer, the mixture and the mixed sheet are placed in a mold to be pre-pressed and subjected to heating foaming treatment, and the sound absorption and insulation composite material is obtained. The sound-absorbing and sound-insulating composite material has a three-layer structure, is integrally compounded by combining a specific process, and achieves excellent sound-absorbing and sound-insulating effects by limiting the raw materials and the use amount of each layer.

Description

Technical Field

[0001] This invention relates to the field of sound-absorbing and sound-insulating materials technology, specifically to a sound-absorbing and sound-insulating composite material and its preparation method. Background Technology

[0002] As consumers increasingly demand quiet operation from home appliances, noise reduction design within these appliances becomes crucial. Currently, most sound insulation materials used in appliances are single or simple composite materials, for example:

[0003] Pure polyester fiber cotton: It has good sound absorption properties, is lightweight and environmentally friendly, but its sound insulation (especially low-frequency sound insulation) and damping properties are limited, it lacks rigidity and is difficult to support independently.

[0004] Polyurethane foam (PU Foam): Divided into open-cell and closed-cell types. Open-cell foam has good sound absorption but poor sound insulation; closed-cell foam has slightly better sound insulation but poor sound absorption. Neither type is ideal for suppressing low-to-mid-frequency noise, and both may experience aging issues with long-term use.

[0005] Butyl rubber damping sheets: They have excellent damping, vibration reduction and sound insulation properties, and are particularly good at suppressing structural vibration transmission and low-to-mid frequency noise. However, they have high density, high cost, are difficult to process and do not absorb sound.

[0006] In view of this, the present invention is hereby proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a sound-absorbing and sound-insulating composite material and its preparation method. The sound-absorbing and sound-insulating composite material of this invention has a three-layer structure and is integrated into a single composite through a specific process to achieve excellent sound insulation and sound absorption effects.

[0008] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted:

[0009] The first aspect of this invention provides a method for preparing a sound-absorbing and sound-insulating composite material, the method comprising the following steps:

[0010] (a) The polyester fibers are opened, combed into a web, sprayed with hot melt adhesive powder and hot-pressed to obtain a polyester fiber layer;

[0011] (b) Butyl rubber is modified by titanate coupling agent to obtain modified butyl rubber; then, the modified butyl rubber, polyether polyol, polyester polyol, deionized water, amine catalyst and organotin catalyst are stirred and mixed, and isocyanate is added and stirred and mixed to obtain a mixture.

[0012] (c) Butyl rubber, polyisobutylene and petroleum resin are mixed, antioxidant and half of barium sulfate are added and mixed again, then polyester staple fiber and the remaining barium sulfate are added and mixed again, and then pressed into sheets to obtain mixed sheets.

[0013] (d) Lay a polyester fiber layer in a mold, pour the mixture onto the surface of the polyester fiber layer, cover the surface of the mixture with a compounded sheet and close the mold, then perform pre-pressing and heating foaming treatment, and after the foaming pressure reaches the peak value, perform heating and pressurizing treatment, and cool to obtain the sound-absorbing and sound-insulating composite material.

[0014] Preferably, in step (a), the polyester fiber is hollow polyester staple fiber; the amount of hot melt adhesive powder added is 8%~12% of the mass of the polyester fiber, and the hot melt adhesive powder is PES hot melt adhesive; the thickness of the polyester fiber layer is 8~12mm, and the density is 250~350g / m³. 2 .

[0015] Preferably, in step (a), the hot pressing temperature is 140~150℃.

[0016] Preferably, in step (b), the modification treatment of butyl rubber with titanate coupling agent includes: spraying an ethanol solution of titanate coupling agent onto the surface of butyl rubber, stirring and mixing at 60~80℃ for 15~30min, and then air-drying to obtain modified butyl rubber, wherein the amount of titanate coupling agent is 1%~2% of the mass of butyl rubber.

[0017] Preferably, in step (b), the amounts of modified butyl rubber, polyether polyol, polyester polyol, deionized water, amine catalyst, organotin catalyst, and isocyanate are as follows:

[0018] The mixture consists of 20-30 parts modified butyl rubber, 90-100 parts polyether polyol, 25-35 parts polyester polyol, 1-2 parts deionized water, 0.3-0.5 parts amine catalyst, 0.1-0.2 parts organotin catalyst, and 100-120 parts isocyanate.

[0019] Preferably, in step (c), the amounts of butyl rubber, polyisobutylene, petroleum resin, antioxidant, barium sulfate, and polyester staple fiber are as follows:

[0020] The composition includes 35-45 parts butyl rubber, 20-30 parts polyisobutylene, 15-25 parts petroleum resin, 0.3-0.8 parts antioxidant, 25-35 parts barium sulfate, and 10-15 parts polyester staple fiber.

[0021] Preferably, in step (c), the thickness of the compounded sheet is 1.2~2mm and the density is 2200~2800g / m2.

[0022] Preferably, in step (d), the pre-compression pressure is 0.4~0.6MPa; the heating and foaming temperature is 75~85℃; the heating and pressurization temperature is 90~95℃; and the pressure is 1.5~2.0MPa.

[0023] Preferably, in step (d), the thickness of the mixture after foaming and shaping is 6~10mm.

[0024] A second aspect of the present invention provides a sound-absorbing and sound-insulating composite material prepared by the above-described preparation method.

[0025] Compared with the prior art, the beneficial effects of the present invention include at least the following:

[0026] This invention relates to a sound-absorbing and sound-insulating composite material with a three-layer structure, which is integrally composited through a specific process to achieve excellent sound absorption and insulation effects. Specifically, the polyester fiber layers are formed by three-dimensional mesh hot-melt bonding of hollow polyester fibers, which has a high porosity and can efficiently absorb sound waves. The middle layer is a blended foam layer of microporous polyurethane and butyl damping ions, which has an interconnected pore structure with open / partial open pores. On the one hand, sound waves are absorbed through the friction and resonance of the pore structure, and on the other hand, the viscoelastic deformation of the butyl damping particles is excited, which efficiently converts the mechanical energy of the sound waves into heat energy (damping dissipation). The compounded sheet layer has a high density and has the effect of reflecting and isolating sound waves. Through the combined effect of each layer, the composite material has excellent sound absorption and sound insulation effects, better meeting market demands. In addition, the preparation method of this invention's sound-absorbing and sound-insulating composite material can achieve a dissolution phenomenon between the layers, realizing a gradient transition without obvious interfaces, avoiding strong rebound of sound waves at the interface, and improving the sound absorption and sound insulation effects. Detailed Implementation

[0027] The embodiments of the technical solution of the present invention will be described in detail below with reference to the examples. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and are therefore only examples, and should not be used to limit the scope of protection of the present invention.

[0028] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0029] This invention provides a method for preparing a sound-absorbing and sound-insulating composite material, the method comprising the following steps:

[0030] (a) The polyester fibers are opened, combed into a web, sprayed with hot melt adhesive powder and hot-pressed to obtain a polyester fiber layer;

[0031] (b) Butyl rubber is modified by titanate coupling agent to obtain modified butyl rubber; then, the modified butyl rubber, polyether polyol, polyester polyol, deionized water, amine catalyst and organotin catalyst are stirred and mixed, and isocyanate is added and stirred and mixed to obtain a mixture.

[0032] (c) Butyl rubber, polyisobutylene and petroleum resin are mixed, antioxidant and half of barium sulfate are added and mixed again, then polyester staple fiber and the remaining barium sulfate are added and mixed again, and then pressed into sheets to obtain mixed sheets.

[0033] (d) Lay a polyester fiber layer in a mold, pour the mixture onto the surface of the polyester fiber layer, cover the surface of the mixture with a compounded sheet and close the mold, then perform pre-pressing and heating foaming treatment, and after the foaming pressure reaches the peak value, perform heating and pressurizing treatment, and cool to obtain the sound-absorbing and sound-insulating composite material.

[0034] In one embodiment, in step (a), the polyester fiber is hollow polyester staple fiber; the amount of hot melt adhesive powder added is 8% to 12% of the mass of the polyester fiber, and the hot melt adhesive powder is PES hot melt adhesive; the thickness of the polyester fiber layer is 8 to 12 mm, and the density is 250 to 350 g / m2.

[0035] In one embodiment, in step (a), the hot pressing temperature is 140~150°C.

[0036] In one embodiment, step (b) of modifying butyl rubber with titanate coupling agent includes: spraying an ethanol solution of titanate coupling agent onto the surface of butyl rubber, stirring and mixing at 60-80°C for 15-30 minutes, and then air-drying to obtain modified butyl rubber, wherein the amount of titanate coupling agent is 1%-2% of the mass of butyl rubber.

[0037] In one embodiment, in step (b), the amounts of modified butyl rubber, polyether polyol, polyester polyol, deionized water, amine catalyst, organotin catalyst, and isocyanate are as follows:

[0038] The mixture consists of 20-30 parts modified butyl rubber, 90-100 parts polyether polyol, 25-35 parts polyester polyol, 1-2 parts deionized water, 0.3-0.5 parts amine catalyst, 0.1-0.2 parts organotin catalyst, and 100-120 parts isocyanate.

[0039] In one embodiment, in step (c), the amounts of butyl rubber, polyisobutylene, petroleum resin, antioxidant, barium sulfate, and polyester staple fiber are as follows:

[0040] The composition includes 35-45 parts butyl rubber, 20-30 parts polyisobutylene, 15-25 parts petroleum resin, 0.3-0.8 parts antioxidant, 25-35 parts barium sulfate, and 10-15 parts polyester staple fiber.

[0041] In one embodiment, in step (c), the thickness of the compounded sheet is 1.2~2mm, and the density is 2200~2800g / m³. 2 .

[0042] In one embodiment, in step (d), the pre-compression pressure is 0.4~0.6MPa; the heating and foaming temperature is 75~85℃; the heating and pressurization temperature is 90~95℃, and the pressure is 1.5~2.0MPa.

[0043] In one embodiment, in step (d), the thickness of the mixture after foaming and shaping is 6~10mm.

[0044] Another embodiment of the present invention provides a sound-absorbing and sound-insulating composite material prepared by the above preparation method.

[0045] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0046] The raw materials used in the following embodiments are as follows:

[0047] Butyl rubber: Butyl 268, purchased from Hubei Guangcheng New Materials Co., Ltd.;

[0048] Polyether polyol: hydroxyl value 256~300mgKOH / g, purchased from Haian Petrochemical Plant, Jiangsu Province;

[0049] Polyester polyol: 400~450mgKOH / g, purchased from Wuhan Jiyesheng Chemical Co., Ltd.;

[0050] Amine catalyst: A-33, commercially available;

[0051] Organotin catalyst: Stannous octoate T-9; commercially available;

[0052] Isocyanate: Diphenylmethane diisocyanate, commercially available;

[0053] Titanate coupling agent: LK-105;

[0054] Polyisobutylene: CAS Registry No. 9003-27-4; purchased from Shandong Jinghao Chemical Co., Ltd.

[0055] Petroleum resin: C9 petroleum resin; purchased from Puyang Ruicheng Chemical Co., Ltd.

[0056] Antioxidant: Antioxidant 1010;

[0057] Polyester fiber: hollow polyester staple fiber; purchased from Ningbo Xiongsheng New Materials Co., Ltd.

[0058] Hot melt adhesive: PES hot melt adhesive, model 6010-F, Shanghai Qiyou Chemical Materials Co., Ltd.

[0059] Polyester staple fiber: diameter 10~25μm, length 6mm; purchased from Shandong Tonghui Glass Fiber Co., Ltd.

[0060] Example 1

[0061] This embodiment describes a method for preparing a sound-absorbing and sound-insulating composite material, which includes the following steps:

[0062] (a) The polyester fibers are opened and combed into a web, then sprayed with hot melt adhesive powder and hot-pressed at 140°C for 80 seconds to obtain a thickness of 8 mm and a density of 250 g / m³. 2 The polyester fiber layer contains hot melt adhesive powder added at 8% of the polyester fiber mass.

[0063] (b) Spray an ethanol solution (10%) of titanate coupling agent onto the surface of butyl rubber, stir and mix at 80°C for 15 min, and then air dry to obtain modified butyl rubber. The amount of titanate coupling agent is 1% of the mass of butyl rubber. Then, stir and mix 30 parts of modified butyl rubber, 90 parts of polyether polyol, 25 parts of polyester polyol, 2 parts of deionized water, 0.3 parts of amine catalyst and 0.1 parts of organotin catalyst, and then add 100 parts of isocyanate and continue stirring to obtain a mixture.

[0064] (c) 35 parts butyl rubber, 30 parts polyisobutylene, and 15 parts petroleum resin are mixed together. Then, 0.8 parts antioxidant and 15 parts barium sulfate are added and the mixture is continued to be mixed. Next, 10 parts polyester staple fiber and 15 parts barium sulfate are added and the mixture is continued to be mixed. The mixture is then pressed into sheets to obtain a mixed sheet with a thickness of 2 mm and a density of 2800 g / m³. 2 ;

[0065] (d) Lay a polyester fiber layer in a mold, quickly pour the mixture onto the surface of the polyester fiber layer, then cover the surface of the mixture with a compounded sheet and close the mold, then pre-press (0.4 MPa) and heat up to foam (75°C), and after the foaming pressure reaches the peak, heat up and pressurize (95°C, pressure 1.5 MPa), cool, and obtain the sound-absorbing and sound-insulating composite material, wherein the thickness of the mixture after foaming and shaping is 6 mm.

[0066] Example 2

[0067] This embodiment describes a method for preparing a sound-absorbing and sound-insulating composite material, which includes the following steps:

[0068] (a) Polyester fibers are opened, carded into a web, sprayed with hot melt adhesive powder, and hot-pressed at 150°C for 80 seconds to obtain a thickness of 12 mm and a density of 350 g / m³. 2 The polyester fiber layer contains hot melt adhesive powder at a concentration of 12% of the polyester fiber mass.

[0069] (b) Spray an ethanol solution (10%) of titanate coupling agent onto the surface of butyl rubber, stir and mix at 60°C for 30 min, and then air dry to obtain modified butyl rubber. The amount of titanate coupling agent is 2% of the mass of butyl rubber. Then, stir and mix 20 parts of modified butyl rubber, 100 parts of polyether polyol, 35 parts of polyester polyol, 1 part of deionized water, 0.5 parts of amine catalyst and 0.2 parts of organotin catalyst, and then add 120 parts of isocyanate and continue stirring to obtain a mixture.

[0070] (c) 45 parts butyl rubber, 20 parts polyisobutylene, and 25 parts petroleum resin are mixed together. Then, 0.3 parts antioxidant and 15 parts barium sulfate are added and the mixture is continued to be mixed. Next, 15 parts polyester staple fiber and 15 parts barium sulfate are added and the mixture is continued to be mixed. The mixture is then pressed into sheets to obtain a mixed sheet with a thickness of 1.2 mm and a density of 2200 g / m³. 2 ;

[0071] (d) Lay a polyester fiber layer in a mold, quickly pour the mixture onto the surface of the polyester fiber layer, then cover the surface of the mixture with a compounded sheet and close the mold, then pre-press (0.6 MPa) and heat up to foam (85°C), and after the foaming pressure reaches the peak, heat up and pressurize (90°C, pressure 2.0 MPa), cool, and obtain the sound-absorbing and sound-insulating composite material, wherein the thickness of the mixture after foaming and shaping is 10 mm.

[0072] Example 3

[0073] This embodiment describes a method for preparing a sound-absorbing and sound-insulating composite material, which includes the following steps:

[0074] (a) Polyester fibers are opened, carded into a web, sprayed with hot melt adhesive powder, and hot-pressed at 145°C for 80 seconds to obtain a thickness of 10 mm and a density of 300 g / m³. 2 The polyester fiber layer contains hot melt adhesive powder at a concentration of 10% of the polyester fiber mass.

[0075] (b) Spray an ethanol solution (10%) of titanate coupling agent onto the surface of butyl rubber, stir and mix at 70°C for 20 min, and then air dry to obtain modified butyl rubber. The amount of titanate coupling agent is 1.5% of the mass of butyl rubber. Then, stir and mix 25 parts of modified butyl rubber, 95 parts of polyether polyol, 30 parts of polyester polyol, 1.5 parts of deionized water, 0.4 parts of amine catalyst and 0.2 parts of organotin catalyst, and then add 110 parts of isocyanate and continue stirring to obtain a mixture.

[0076] (c) 40 parts butyl rubber, 25 parts polyisobutylene, and 20 parts petroleum resin are mixed together. Then, 0.5 parts antioxidant and 15 parts barium sulfate are added and the mixture is continued to be mixed. Next, 12 parts polyester staple fiber and 15 parts barium sulfate are added and the mixture is continued to be mixed. The mixture is then pressed into sheets to obtain a mixed sheet with a thickness of 1.5 mm and a density of 2500 g / m³. 2 ;

[0077] (d) Lay a polyester fiber layer in a mold, quickly pour the mixture onto the surface of the polyester fiber layer, then cover the surface of the mixture with a compounded sheet and close the mold, then pre-press (0.5 MPa) and heat up to foam (80°C), and after the foaming pressure reaches the peak, heat up and pressurize (92°C, pressure 1.8 MPa), cool, and obtain the sound-absorbing and sound-insulating composite material, wherein the thickness of the mixture after foaming and shaping is 8 mm.

[0078] Comparative Example 1

[0079] This comparative example illustrates a method for preparing a sound-absorbing and sound-insulating composite material, the method comprising the following steps:

[0080] (a) Polyester fibers are opened, carded into a web, sprayed with hot melt adhesive powder, and hot-pressed at 145°C for 80 seconds to obtain a thickness of 10 mm and a density of 300 g / m³. 2 The polyester fiber layer contains hot melt adhesive powder at a concentration of 10% of the polyester fiber mass.

[0081] (b) 40 parts butyl rubber, 25 parts polyisobutylene, and 20 parts petroleum resin were mixed, then 0.5 parts antioxidant and 15 parts barium sulfate were added and mixed again. Then, 12 parts polyester staple fiber and 15 parts barium sulfate were added and mixed again. The mixture was then pressed into sheets to obtain a mixed sheet with a thickness of 1.5 mm and a density of 2500 g / m³. 2 ;

[0082] (c) The polyester fiber layer and the compounded sheet are bonded together to obtain the sound-absorbing and sound-insulating composite material.

[0083] Comparative Example 2

[0084] This comparative example illustrates a method for preparing a sound-absorbing and sound-insulating composite material, the method comprising the following steps:

[0085] (a) Polyester fibers are opened, carded into a web, sprayed with hot melt adhesive powder, and hot-pressed at 145°C for 80 seconds to obtain a thickness of 10 mm and a density of 300 g / m³. 2 The polyester fiber layer contains hot melt adhesive powder at a concentration of 10% of the polyester fiber mass.

[0086] (b) Spray an ethanol solution (10%) of titanate coupling agent onto the surface of butyl rubber, stir and mix at 70°C for 20 min, and then air dry to obtain modified butyl rubber. The amount of titanate coupling agent is 1.5% of the mass of butyl rubber. Then, stir and mix 25 parts of modified butyl rubber, 95 parts of polyether polyol, 30 parts of polyester polyol, 1.5 parts of deionized water, 0.4 parts of amine catalyst and 0.2 parts of organotin catalyst, and then add 110 parts of isocyanate and continue stirring to obtain a mixture.

[0087] (c) Lay a polyester fiber layer in a mold, quickly pour the mixture onto the surface of the polyester fiber layer, close the mold, then pre-press (0.5MPa) and heat up to foam (80°C), and after the foaming pressure reaches the peak, heat up and pressurize (92°C, pressure is 1.8MPa), cool, and obtain the sound-absorbing and sound-insulating composite material, wherein the thickness of the mixture after foaming and shaping is 8mm.

[0088] Experimental Example

[0089] The sound-absorbing and sound-insulating composite materials prepared in Example 3 and Comparative Examples 1-2 were obtained respectively;

[0090] The average sound absorption coefficient of the above sound-absorbing and sound-insulating composite materials in the range of 250~4000Hz was tested (GB / T18696.2-2002), and the weighted sound insulation of the sound-absorbing and sound-insulating composite materials was tested (GB / T 19889.3-2005+GB / T50121-2005); the results are shown in Table 1.

[0091] Table 1

[0092] Group Average sound absorption coefficient Weighted sound insulation (Rw) Example 3 0.75 28dB Comparative Example 1 0.55 25dB Comparative Example 2 0.60 17dB

[0093] As shown in Table 1:

[0094] Compared with the comparative example, the sound-absorbing and sound-insulating composite material prepared in the embodiments of the present invention has superior sound insulation and sound absorption performance, and can better meet market demands.

[0095] 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A method for preparing a sound-absorbing and sound-insulating composite material, characterized in that, The preparation method includes the following steps: (a) The polyester fibers are opened, combed into a web, sprayed with hot melt adhesive powder and hot-pressed to obtain a polyester fiber layer; (b) Butyl rubber is modified by titanate coupling agent to obtain modified butyl rubber; then, the modified butyl rubber, polyether polyol, polyester polyol, deionized water, amine catalyst and organotin catalyst are stirred and mixed, and isocyanate is added and stirred and mixed to obtain a mixture. (c) Butyl rubber, polyisobutylene and petroleum resin are mixed, antioxidant and half of barium sulfate are added and mixed again, then polyester staple fiber and the remaining barium sulfate are added and mixed again, and then pressed into sheets to obtain mixed sheets. (d) Lay a polyester fiber layer in a mold, pour the mixture onto the surface of the polyester fiber layer, cover the surface of the mixture with a compounded sheet and close the mold, then perform pre-pressing and heating foaming treatment, and after the foaming pressure reaches the peak value, perform heating and pressurizing treatment, and cool to obtain the sound-absorbing and sound-insulating composite material.

2. The preparation method according to claim 1, characterized in that, In step (a), the polyester fiber is hollow polyester staple fiber; the amount of hot melt adhesive powder added is 8%~12% of the polyester fiber mass, and the hot melt adhesive powder is PES hot melt adhesive; the thickness of the polyester fiber layer is 8~12mm, and the density is 250~350g / m³. 2 .

3. The preparation method according to claim 1, characterized in that, In step (a), the hot pressing temperature is 140~150℃.

4. The preparation method according to claim 1, characterized in that, In step (b), the modification treatment of butyl rubber with titanate coupling agent includes: spraying an ethanol solution of titanate coupling agent onto the surface of butyl rubber, stirring and mixing at 60~80℃ for 15~30min, and then air-drying to obtain modified butyl rubber, wherein the amount of titanate coupling agent is 1%~2% of the mass of butyl rubber.

5. The preparation method according to claim 1, characterized in that, In step (b), the amounts of modified butyl rubber, polyether polyol, polyester polyol, deionized water, amine catalyst, organotin catalyst, and isocyanate are as follows: The mixture consists of 20-30 parts modified butyl rubber, 90-100 parts polyether polyol, 25-35 parts polyester polyol, 1-2 parts deionized water, 0.3-0.5 parts amine catalyst, 0.1-0.2 parts organotin catalyst, and 100-120 parts isocyanate.

6. The preparation method according to claim 1, characterized in that, In step (c), the amounts of butyl rubber, polyisobutylene, petroleum resin, antioxidant, barium sulfate, and polyester staple fiber are as follows: The composition includes 35-45 parts butyl rubber, 20-30 parts polyisobutylene, 15-25 parts petroleum resin, 0.3-0.8 parts antioxidant, 25-35 parts barium sulfate, and 10-15 parts polyester staple fiber.

7. The preparation method according to claim 1, characterized in that, In step (c), the thickness of the compounded sheet is 1.2~2mm, and the density is 2200~2800g / m³. 2 .

8. The preparation method according to claim 1, characterized in that, In step (d), the pre-compression pressure is 0.4~0.6MPa; the heating and foaming temperature is 75~85℃; the heating and pressurization temperature is 90~95℃, and the pressure is 1.5~2.0MPa.

9. The preparation method according to claim 1, characterized in that, In step (d), the thickness of the mixture after foaming and shaping is 6~10mm.

10. The sound-absorbing and sound-insulating composite material prepared by any one of the preparation methods according to claims 1 to 9.