Preparation method of wide-temperature-range high-damping metal hollow sphere / polyurethane damping composite material

Abstract

The invention discloses a preparation method of a wide-temperature-range high-damping metal hollow sphere / polyurethane damping composite material, and relates to a preparation method of a damping composite material. The method comprises the following steps: 1, carrying out surface modification on metal hollow spheres; and 2, preparing the polymer. Compared with pure polyurethane, the prepared wide-temperature-range high-damping metal hollow sphere / polyurethane damping composite material has the advantages that the damping performance is greatly improved, the temperature range is widened, the excellent damping performance and acoustic performance are achieved, the preparation process is simple, the stability is high, and the composite material is suitable for large-area pouring and complex-shape base materials; wide application prospects are realized in the fields of ships, aerospace, vehicles, building materials and the like; after the surface-modified metal hollow spheres are compounded with polyurethane, the damping performance can be greatly improved, the temperature range is widened, the loss factor is increased from 0.45 to 0.85, and the effective temperature range is widened from 59.9 DEG C to 100 DEG C or above.

Description

Technical Field

[0001] The invention relates to a method for preparing a damping composite material, in particular to a method for preparing a wide temperature range high-damping metal hollow sphere / polyurethane damping composite material. Background Art

[0002] For sound insulation materials, the purpose of their design is to hinder the continued propagation of sound and reduce the transmitted sound energy after the sound passes through the material. Usually, some materials with large surface density and thick thickness are selected to prepare sound insulation structural parts according to the sound insulation quality law, such as metal materials and solid brick walls. Although the preparation method of this type of traditional sound insulation material components is simple and can meet a large number of engineering needs, it also has the disadvantages of high energy consumption, low production efficiency and high cost, which is a waste of resources. Therefore, the research and development of new sound insulation material components with light weight, high strength, low cost and simple preparation process has a good research and development prospect. Studies have found that materials with hollow structures in acoustic materials (such as hollow particle filled composite materials, porous metals and polymer foams, etc.) often have good sound insulation and sound absorption properties, and polyurethane and rubber are the most commonly used matrix materials in acoustic materials. Therefore, the design and preparation of a type of acoustic composite materials with hollow structures based on polyurethane and rubber has a very broad application and development prospect. Among the many hollow structural materials, metal hollow spheres (MHS) and metal hollow sphere composites with low density and high strength characteristics have been widely studied and applied in the fields of acoustics, mechanics, thermal insulation and radiation shielding. However, the research on them as damping composite materials has just begun, and both theoretical research and practical application are relatively small, and their application prospects are very broad.

[0003] Porous metal materials have the characteristics of low density and high specific strength, and have been widely used in energy absorption, heat insulation, acoustics and other fields. For traditional porous metal materials, such as foam metal and metal fiber felt, there are a large number of randomly distributed or directional pores inside them, and the morphology of these pores can generally be divided into open-cell and closed-cell types. The pores in this type of traditional porous metal have different morphologies and sizes, and the uniformity of pore distribution is difficult to control, which easily leads to unstable and uneven performance of porous metals, which greatly limits the engineering application scope and usage scenarios of porous metal materials. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a method for preparing a wide temperature range high-damping metal hollow sphere / polyurethane damping composite material.

[0005] A method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material is specifically completed by the following steps:

[0006] 1. Surface modification of metal hollow spheres;

[0007] First, the surface of the metal hollow sphere is cleaned to obtain the surface-cleaned metal hollow sphere; the surface-cleaned metal hollow sphere is modified by using a silane coupling agent or a multi-walled carbon nanotube and a silane coupling agent to obtain the surface-modified metal hollow sphere; the surface-modified metal hollow sphere is added into a mold, and then the mold is preheated;

[0008] 2. Preparation of polymers:

[0009] The polyol, isocyanate and dibutyltin dilaurate after dehydration are added into a three-necked flask, and then stirred and reacted for a period of time under nitrogen atmosphere protection and temperature of 60°C to 100°C, and then a chain extender is added, and stirred and reacted for a period of time to obtain a mixed solution; the mixed solution is poured into a preheated mold, and cured at 80°C for a period of time to obtain a wide temperature range high damping metal hollow sphere / polyurethane damping composite material;

[0010] The mass fraction of the surface-modified metal hollow spheres in the wide temperature range high-damping metal hollow sphere / polyurethane damping composite material described in step 2 is 5% to 15%.

[0011] Principles and advantages of the present invention:

[0012] 1. As a new type of material with a special cavity structure, metal hollow spheres have the characteristics of low density, high strength and high porosity, as well as good structural design. Metal hollow spheres can be used as filling phases to prepare metal hollow sphere composites (MHSC) with very excellent mechanical, damping, thermal insulation, radiation shielding and acoustic properties. Compared with traditional porous metal materials, they have the advantage of easy realization of structural and functional integrated design; the present invention uses metal hollow spheres to prepare a wide temperature range high damping metal hollow sphere / polyurethane damping composite material, which has excellent damping performance and a wide temperature range, overcoming the limitations of traditional materials. This new damping composite material is formed by surface treatment of metal hollow balls and casting, so that the metal hollow balls are connected to the molecular chains of the polyurethane matrix through chemical bonds and mechanical entanglement, which can greatly improve the damping performance and widen the temperature range; the polymer casting method is a preparation process with simple operation, fast production and wide application range. Most of the high molecular polymers can be cured at room temperature, so its energy consumption is relatively low, more green and environmentally friendly, and has a wide range of application prospects;

[0013] 2. A wide temperature range high damping metal hollow sphere / polyurethane damping composite material prepared by the present invention greatly improves the damping performance and broadens the temperature range compared with pure polyurethane, has excellent damping performance and acoustic performance, simple preparation process, high stability, and is suitable for large-area casting and complex-shaped substrates; composite materials with good damping, sound absorption and sound insulation properties can be prepared by means of foaming, blending with fibers and nanoparticles, etc., and have broad application prospects in the fields of ships, aerospace, vehicles, building materials, etc.;

[0014] 3. After the surface-modified metal hollow spheres are compounded with polyurethane, the damping performance can be greatly improved and the temperature range can be widened. The loss factor is increased from 0.45 to 0.85, and the effective temperature range is widened from 59.9°C to more than 100°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a metal hollow sphere modified by silane coupling agent KH550;

[0016] Figure 2 It is a metal hollow sphere modified by hydroxylated multi-walled carbon nanotubes;

[0017] Figure 3 The damping performance of high damping metal hollow sphere / polyurethane damping composite material in a wide temperature range. DETAILED DESCRIPTION

[0018] Specific implementation method 1: This implementation method is a method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material, which is specifically completed by the following steps:

[0019] 1. Surface modification of metal hollow spheres;

[0020] First, the surface of the metal hollow sphere is cleaned to obtain the surface-cleaned metal hollow sphere; the surface-cleaned metal hollow sphere is modified by using a silane coupling agent or a multi-walled carbon nanotube and a silane coupling agent to obtain the surface-modified metal hollow sphere; the surface-modified metal hollow sphere is added into a mold, and then the mold is preheated;

[0021] 2. Preparation of polymers:

[0022] The polyol, isocyanate and dibutyltin dilaurate after dehydration are added into a three-necked flask, and then stirred and reacted for a period of time under nitrogen atmosphere protection and temperature of 60°C to 100°C, and then a chain extender is added, and stirred and reacted for a period of time to obtain a mixed solution; the mixed solution is poured into a preheated mold, and cured at 80°C for a period of time to obtain a wide temperature range high damping metal hollow sphere / polyurethane damping composite material;

[0023] The mass fraction of the surface-modified metal hollow spheres in the wide temperature range high-damping metal hollow sphere / polyurethane damping composite material described in step 2 is 5% to 15%.

[0024] Specific implementation method 2: This implementation method is different from specific implementation method 1 in that: the diameter of the metal hollow sphere in step 1 is 2 mm to 5 mm; the silane coupling agent in step 1 is coupling agent KH550; the preheating temperature of the mold in step 1 is 80° C. The other steps are the same as those in specific implementation method 1.

[0025] Specific implementation method three: This implementation method is different from specific implementation method one or two in that: in step one, the surface of the metal hollow ball is cleaned, which is specifically completed according to the following steps:

[0026] First, the surface of the metal hollow sphere is cleaned with a 5% sodium hydroxide solution for 5 to 8 minutes, then rinsed with distilled water for 2 to 4 times, and then soaked with 10% dilute hydrochloric acid for 5 to 8 minutes to obtain a metal hollow sphere after surface cleaning. The other steps are the same as those in the first or second embodiment.

[0027] Specific embodiment 4: This embodiment differs from specific embodiments 1 to 3 in that: in step 1, a silane coupling agent is used to modify the surface-cleaned hollow metal sphere to obtain the surface-modified hollow metal sphere, which is specifically completed by the following steps:

[0028] ①, mixing silane coupling agent, water and anhydrous ethanol in a volume ratio of 1:3:6, and hydrolyzing at 50°C for 2h to obtain a silane coupling agent solution;

[0029] ②, immerse the cleaned hollow metal spheres in a silane coupling agent solution for 1 to 3 hours, take them out and dry them to obtain the surface-modified hollow metal spheres. The other steps are the same as those in the first to third embodiments.

[0030] Specific embodiment 5: This embodiment differs from specific embodiments 1 to 4 in that: in step 1, multi-walled carbon nanotubes and silane coupling agents are used to modify the metal hollow spheres after surface cleaning, which is specifically completed in the following steps:

[0031] ①, Mix the silane coupling agent, water and anhydrous ethanol in a volume ratio of 1:3:6, and hydrolyze at 50°C for 2h to obtain a silane coupling agent solution; divide the silane coupling agent solution into two parts;

[0032] ②, immerse the cleaned hollow metal sphere into a silane coupling agent solution for modification for 1h to 3h, take it out and dry it to obtain the preliminarily modified hollow metal sphere;

[0033] ③, adding multi-walled carbon nanotubes to the silane coupling agent solution for modification for 1h to 3h, taking them out and drying them to obtain hydroxylated multi-walled carbon nanotubes;

[0034] ④, the preliminarily modified metal hollow spheres and hydroxylated multi-walled carbon nanotubes are added to anhydrous ethanol at a mass ratio of 200:1, stirred for reaction for 3h to 5h, after the anhydrous ethanol evaporates, the hydroxylated multi-walled carbon nanotubes are deposited on the surface of the metal hollow spheres, taken out and dried at 100°C to obtain surface-modified metal hollow spheres. The other steps are the same as those in the first to fourth embodiments.

[0035] Specific embodiment 6: This embodiment differs from specific embodiments 1 to 5 in that the polyol described in step 2 is a mixture of two or more of polyoxypropylene glycol, polytetrahydrofuran glycol, polyethylene glycol, polymer polyol and poly-ε-caprolactone polyol. The other steps are the same as those of specific embodiments 1 to 5.

[0036] Specific embodiment 7: This embodiment differs from specific embodiments 1 to 6 in that the isocyanate described in step 2 is a mixture of two or more of diphenylmethane diisocyanate, isophorone diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, tetramethyl-m-xylylene diisocyanate, and 4,4'-dicyclohexylmethane diisocyanate. The other steps are the same as those of specific embodiments 1 to 6.

[0037] Specific embodiment eight: This embodiment differs from specific embodiments one to seven in that the chain extender described in step two is a mixture of two or more of ethylene glycol, trimethylolpropane, 1,4-butanediol, ethanolamine, 3,3'-dichloro-4,4'-diphenylmethanediamine and 3,5-dimethylthiotoluenediamine. The other steps are the same as specific embodiments one to seven.

[0038] Specific embodiment 9: This embodiment differs from specific embodiments 1 to 8 in that: the dibutyltin dilaurate described in step 2 accounts for 0.05% of the total mass of the polyol and isocyanate; the mass ratio of the polyol to the isocyanate described in step 2 is (25-35):(10-20); the mass ratio of the polyol to the chain extender described in step 2 is (25-35):(2-5). The other steps are the same as specific embodiments 1 to 8.

[0039] Specific embodiment 10: This embodiment differs from specific embodiments 1 to 9 in that: in step 2, the stirring reaction time under nitrogen atmosphere protection and temperature of 60°C to 100°C is 1h to 2h; in step 2, the chain extender is added and the stirring reaction time is 3min to 5min; the curing time in step 2 is 8h to 16h, and the temperature of the preheated mold in step 2 is 80°C. The other steps are the same as those in specific embodiments 1 to 9.

[0040] The following examples are used to verify the beneficial effects of the present invention:

[0041] Embodiment 1: A method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material is specifically completed by the following steps:

[0042] 1. Add the metal hollow balls into the mold and preheat the mold to 80°C;

[0043] The metal hollow ball described in step 1 is a 316L stainless steel hollow ball with a diameter of 2 mm to 5 mm;

[0044] 2. Add 20g of polytetramethylene glycol (PTMG), 15g of polyoxypropylene glycol (PPG2000), 7.88g of diphenylmethane diisocyanate (MDI), 5.25g of isophorone diisocyanate (IPDI) and 0.024g of dibutyltin dilaurate into a three-necked flask, and then stir and react for 1h under nitrogen atmosphere protection and temperature of 65°C, then add 1.25g of ethylene glycol (EG) and 1.8g of 1,4-butanediol (BDO), stir and react for 5min to obtain a mixed solution; pour the mixed solution into a preheated mold, and cure it at 80°C for 8h to obtain a wide temperature range high damping metal hollow sphere / polyurethane damping composite material;

[0045] The mass fraction of the metal hollow spheres in the wide temperature range high damping metal hollow sphere / polyurethane damping composite material described in step 2 is 5%.

[0046] Embodiment 2: A method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material is specifically completed by the following steps:

[0047] 1. Surface modification of metal hollow spheres;

[0048] First, the surface of the metal hollow sphere is cleaned for 5 minutes using a sodium hydroxide solution with a volume fraction of 5%, then rinsed with distilled water for 3 times, and then soaked in dilute hydrochloric acid with a mass fraction of 10% for 5 minutes to obtain a metal hollow sphere after surface cleaning; the metal hollow sphere after surface cleaning is modified with a silane coupling agent to obtain a metal hollow sphere modified with a KH550 silane coupling agent; the metal hollow sphere modified with the KH550 silane coupling agent is added into a mold, and then the mold is preheated to 80°C;

[0049] The metal hollow ball described in step 1 is a 316L stainless steel hollow ball with a diameter of 2 mm to 5 mm;

[0050] The silane coupling agent described in step 1 is coupling agent KH550;

[0051] In step 1, the metal hollow sphere after surface cleaning is modified by using a silane coupling agent to obtain the metal hollow sphere modified by the KH550 silane coupling agent, which is specifically completed by the following steps:

[0052] ①, mixing silane coupling agent, water and anhydrous ethanol in a volume ratio of 1:3:6, and hydrolyzing at 50°C for 2h to obtain a silane coupling agent solution;

[0053] ②, immerse the cleaned hollow metal sphere in a silane coupling agent solution for 2 hours, take it out and dry it to obtain the hollow metal sphere modified by KH550 silane coupling agent;

[0054] 2. Add 15g of polytetramethylene glycol (PTMG), 15g of polyoxypropylene glycol (PPG2000), 7.1g of diphenylmethane diisocyanate (MDI), 6.3g of isophorone diisocyanate (IPDI) and 0.0217g of dibutyltin dilaurate into a three-necked flask, and then stir and react for 1h at 65°C under nitrogen atmosphere protection, then add 1.2g of trimethylolpropane (TMP) and 1.74g of 1,4-butanediol (BDO), stir and react for 5min to obtain a mixed solution; pour the mixed solution into a preheated mold, and cure it at 80°C for 8h to obtain a wide temperature range high damping metal hollow sphere / polyurethane damping composite material;

[0055] The mass fraction of the metal hollow spheres modified with KH550 silane coupling agent in the wide temperature range high damping metal hollow sphere / polyurethane damping composite material described in step 2 is 10%.

[0056] Embodiment 3: A method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material is specifically completed by the following steps:

[0057] 1. Surface modification of metal hollow spheres;

[0058] First, the surface of the metal hollow sphere is cleaned for 5 minutes using a sodium hydroxide solution with a volume fraction of 5%, then rinsed with distilled water for 3 times, and then soaked in dilute hydrochloric acid with a mass fraction of 10% for 5 minutes to obtain a metal hollow sphere after surface cleaning; the metal hollow sphere after surface cleaning is modified using multi-walled carbon nanotubes and a silane coupling agent to obtain a metal hollow sphere modified with hydroxylated multi-walled carbon nanotubes; the metal hollow sphere modified with hydroxylated multi-walled carbon nanotubes is added into a mold, and then the mold is preheated to 80°C;

[0059] The metal hollow ball described in step 1 is a 316L stainless steel hollow ball with a diameter of 2 mm to 5 mm;

[0060] The silane coupling agent described in step 1 is coupling agent KH550;

[0061] In step 1, the metal hollow spheres after surface cleaning are modified using multi-walled carbon nanotubes and a silane coupling agent to obtain metal hollow spheres modified with hydroxylated multi-walled carbon nanotubes, which is specifically completed in the following steps:

[0062] ①, mixing silane coupling agent, water and anhydrous ethanol in a volume ratio of 1:3:6, and hydrolyzing at 50°C for 2h to obtain a silane coupling agent solution;

[0063] ②, immersing the cleaned hollow metal spheres in a silane coupling agent solution for 2 hours, taking them out and drying them to obtain hollow metal spheres modified with hydroxylated multi-walled carbon nanotubes;

[0064] 2. Add 20g of polytetramethylene glycol (PTMG), 15g of polyoxypropylene glycol (PPG2000), 7.88g of diphenylmethane diisocyanate (MDI), 5.25g of isophorone diisocyanate (IPDI) and 0.024g of dibutyltin dilaurate into a three-necked flask, and then stir and react for 1h under nitrogen atmosphere protection and temperature of 65°C, then add 1.25g of ethylene glycol (EG) and 1.8g of 1,4-butanediol (BDO), stir and react for 5min to obtain a mixed solution; pour the mixed solution into a preheated mold, and cure it at 80°C for 8h to obtain a wide temperature range high damping metal hollow sphere / polyurethane damping composite material;

[0065] The mass fraction of the metal hollow spheres modified with hydroxylated multi-walled carbon nanotubes in the wide temperature range high-damping metal hollow sphere / polyurethane damping composite material described in step 2 is 15%.

[0066] Comparative Example: The preparation method of the polyurethane damping composite material is specifically completed according to the following steps:

[0067] 20g of polytetramethylene glycol (PTMG), 15g of polyoxypropylene glycol (PPG2000), 7.88g of diphenylmethane diisocyanate (MDI), 5.25g of isophorone diisocyanate (IPDI) and 0.024g of dibutyltin dilaurate were added into a three-necked flask, and then stirred and reacted for 1h at 65°C under nitrogen atmosphere protection, and then 1.25g of ethylene glycol (EG) and 1.8g of 1,4-butanediol (BDO) were added and stirred and reacted for 5min to obtain a mixed solution; the mixed solution was poured into a mold preheated at 80°C, and cured at 80°C for 8h to obtain a polyurethane damping composite material.

[0068] Figure 3 The damping performance of high damping metal hollow sphere / polyurethane damping composite material in wide temperature range;

[0069] After the modified metal hollow spheres are compounded with polyurethane, the damping performance can be greatly improved and the temperature range can be widened. The loss factor is increased from 0.45 to 0.85, and the effective temperature range is widened from 59.9℃ to greater than 100℃.

Claims

1. A method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material, characterized in that The preparation method is specifically completed according to the following steps:

1. Surface modification of metal hollow spheres; First, the surface of the metal hollow sphere is cleaned to obtain the surface-cleaned metal hollow sphere; the surface-cleaned metal hollow sphere is modified by using a silane coupling agent or a multi-walled carbon nanotube and a silane coupling agent to obtain the surface-modified metal hollow sphere; the surface-modified metal hollow sphere is added into a mold, and then the mold is preheated; 2. Preparation of polymers: The polyol, isocyanate and dibutyltin dilaurate after dehydration are added into a three-necked flask, and then stirred and reacted for a period of time under nitrogen atmosphere protection and temperature of 60°C to 100°C, and then a chain extender is added, and stirred and reacted for a period of time to obtain a mixed solution; the mixed solution is poured into a preheated mold, and cured at 80°C for a period of time to obtain a wide temperature range high damping metal hollow sphere / polyurethane damping composite material; The mass fraction of the surface-modified metal hollow spheres in the wide temperature range high-damping metal hollow sphere / polyurethane damping composite material described in step 2 is 5% to 15%.

2. The method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material according to claim 1, characterized in that The diameter of the metal hollow sphere described in step 1 is 2 mm to 5 mm; the silane coupling agent described in step 1 is coupling agent KH550; and the preheating temperature of the mold in step 1 is 80°C.

3. The method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material according to claim 1, characterized in that In step 1, the surface of the metal hollow ball is cleaned, which is specifically completed in the following steps: Firstly, the surface of the metal hollow sphere is cleaned with a sodium hydroxide solution with a volume fraction of 5min to 8min, then rinsed with distilled water for 2 to 4 times, and then soaked with dilute hydrochloric acid with a mass fraction of 10% for 5min to 8min to obtain a metal hollow sphere with a cleaned surface.

4. The method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material according to claim 1, characterized in that In step 1, the surface of the cleaned hollow metal sphere is modified using a silane coupling agent to obtain the surface-modified hollow metal sphere, which is specifically completed in the following steps: ①, mix the silane coupling agent, water and anhydrous ethanol in a volume ratio of 1:3:6, and hydrolyze at 50°C for 2h to obtain a silane coupling agent solution; ②. Immerse the cleaned hollow metal sphere in a silane coupling agent solution for 1 h to 3 h, take it out and dry it to obtain a surface-modified hollow metal sphere.

5. The method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material according to claim 1, characterized in that In step 1, multi-walled carbon nanotubes and silane coupling agents are used to modify the metal hollow spheres after surface cleaning, which is specifically completed in the following steps: ①, Mix the silane coupling agent, water and anhydrous ethanol in a volume ratio of 1:3:6, and hydrolyze at 50°C for 2h to obtain a silane coupling agent solution; divide the silane coupling agent solution into two parts; ②, immerse the cleaned hollow metal sphere into a silane coupling agent solution for modification for 1h to 3h, take it out and dry it to obtain the preliminarily modified hollow metal sphere; ③, adding multi-walled carbon nanotubes to the silane coupling agent solution for modification for 1h to 3h, taking them out and drying them to obtain hydroxylated multi-walled carbon nanotubes; ④. Add the preliminarily modified metal hollow spheres and hydroxylated multi-walled carbon nanotubes into anhydrous ethanol at a mass ratio of 200:1, stir and react for 3h to 5h. After the anhydrous ethanol evaporates, the hydroxylated multi-walled carbon nanotubes are deposited on the surface of the metal hollow spheres. After taking out, dry them at 100°C to obtain surface-modified metal hollow spheres.

6. The method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material according to claim 1, characterized in that The polyol described in step 2 is a mixture of two or more of polyoxypropylene glycol, polytetrahydrofuran glycol, polyethylene glycol, polymer polyol and poly-ε-caprolactone polyol.

7. The method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material according to claim 1, characterized in that The isocyanate described in step 2 is a mixture of two or more of diphenylmethane diisocyanate, isophorone diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, tetramethyl-m-xylylene diisocyanate and 4,4'-dicyclohexylmethane diisocyanate.

8. The method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material according to claim 1, characterized in that The chain extender in step 2 is a mixture of two or more of ethylene glycol, trimethylolpropane, 1,4-butanediol, ethanolamine, 3,3'-dichloro-4,4'-diphenylmethanediamine and 3,5-dimethylthiotoluene diamine.

9. The method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material according to claim 1, characterized in that The dibutyltin dilaurate described in step 2 accounts for 0.05% of the total mass of the polyol and isocyanate; the mass ratio of the polyol and isocyanate described in step 2 is (25-35):(10-20); the mass ratio of the polyol and chain extender described in step 2 is (25-35):(2-5).

10. The method for preparing a wide temperature range high damping metal hollow sphere / polyurethane damping composite material according to claim 1, characterized in that In step 2, the stirring reaction time under nitrogen atmosphere protection and temperature of 60°C to 100°C is 1h to 2h; in step 2, the chain extender is added and the stirring reaction time is 3min to 5min; the curing time described in step 2 is 8h to 16h, and the temperature of the preheated mold described in step 2 is 80°C.

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