Sound insulation and shock absorption sound insulation cotton and preparation method thereof

Abstract

The invention relates to the field of sound-insulation cotton, in particular to sound-insulation and shock-absorption sound-insulation cotton and a preparation method thereof. The sound insulation cotton with the sound insulation and shock absorption functions is prepared from the following raw materials in parts by mass: 30 to 50 parts of polytetrahydrofuran ether glycol, 10 to 30 parts of polyhydroxyalkanoate glycol, 10 to 30 parts of polycaprolactone, 20 to 30 parts of diphenylmethane diisocyanate, 5 to 15 parts of 1, 4-phenyl diisocyanate, 10 to 30 parts of modified metal organic framework materials, 3 to 8 parts of chain extenders, 2 to 6 parts of cross-linking agents, 0.1 to 1 part of catalysts and 5 to 15 parts of curing agents. The sound-insulating and shock-absorbing sound-insulating cotton provided by the invention has excellent flexibility and impact resistance, improves the sound-insulating and shock-absorbing effects and environmental protection performance of the material, and has a wide market application prospect.

Description

Technical Field

[0001] The present invention relates to the field of sound insulation cotton, and specifically, to a sound insulation cotton with sound insulation and shock absorption functions and a preparation method thereof. Background Art

[0002] At present, with the development of technology and the improvement of people's living standards, the demand for sound insulation and shock absorption materials is increasing day by day. The existing sound insulation and shock absorption materials mainly include traditional polyurethane foam materials, inorganic porous materials, and organic-inorganic composite materials. Among them, although traditional polyurethane foam materials have certain sound insulation and shock absorption properties, their sound insulation effect is limited, especially the sound insulation performance in the medium and high frequency bands needs to be improved. At the same time, its shock absorption performance is also difficult to meet the requirements of some special scenarios. Inorganic porous materials such as glass fiber cotton and rock wool have good sound insulation performance, but their shock absorption performance is poor, and there are certain environmental safety problems. Organic-inorganic composite materials are prepared by compounding inorganic particles or fibers with an organic polymer matrix to improve the comprehensive performance of the material. However, some existing composite materials have compatibility problems, resulting in unstable material performance, or complex preparation processes and high costs.

[0003] In terms of shock absorption, the existing materials mainly improve the shock absorption effect by increasing the thickness or mass of the material, but this often leads to a decrease in the flexibility and processability of the material, restricting its application range. At the same time, the performance of some existing shock absorption materials will significantly decline in low-temperature environments, unable to meet the usage requirements under different environmental conditions. Summary of the Invention

[0004] In view of this, the present invention is committed to providing a sound insulation cotton with sound insulation and shock absorption functions and a preparation method thereof to solve the problem that the existing sound insulation cotton cannot have both sound insulation and shock absorption properties.

[0005] To solve the above technical problems, the present application is implemented as follows: The present invention provides a sound insulation cotton with sound insulation and shock absorption functions, comprising the following raw materials in parts by mass: 30 - 50 parts of polytetrahydrofuran ether glycol, 10 - 30 parts of polyhydroxyalkanoate glycol, 10 - 30 parts of polycaprolactone, 20 - 30 parts of diphenylmethane diisocyanate, 5 - 15 parts of 1,4-phenylene diisocyanate, 10 - 30 parts of modified metal-organic framework material, 3 - 8 parts of chain extender, 2 - 6 parts of crosslinking agent, 0.1 - 1 part of catalyst, and 5 - 15 parts of curing agent.

[0006] Preferably, in the above-mentioned sound insulation cotton with sound insulation and shock absorption functions, the preparation method of the modified metal-organic framework material comprises the following steps: S10. Mix zinc nitrate, 2-methylimidazole, and a first solvent and react to obtain ZIF-8; S20. After mixing and dispersing dihydromyricetin and a second solvent, add ZIF-8 and mix them to carry out a reaction to obtain an intermediate; S30. After mixing and dispersing maleic anhydride and a third solvent, add the intermediate and mix them to carry out a reaction to obtain a modified metal-organic framework material.

[0007] Preferably, in the above sound-insulating and shock-absorbing sound-insulating cotton, in step S10, the molar ratio of zinc nitrate to 2-methylimidazole is 1:2 to 4; In step S10, the first solvent includes methanol; In step S10, the temperature of the reaction is 10 to 30 °C, and the time of the reaction is 12 to 48 h; In step S20, the mass ratio of dihydromyricetin to ZIF-8 is 5 to 20:1; In step S20, the second solvent includes ethanol; In step S20, the temperature of the reaction is 40 to 60 °C, the time of the reaction is 6 to 24 h; the atmosphere of the reaction is nitrogen; In step S30, the mass ratio of maleic anhydride to the intermediate is 1 to 3:1; In step S30, the third solvent includes tetrahydrofuran; In step S30, the temperature of the reaction is 60 to 80 °C, and the time of the reaction is 8 to 24 h.

[0008] Preferably, in the above sound-insulating and shock-absorbing sound-insulating cotton, the catalyst includes an organotin catalyst; The organotin catalyst includes at least one of dibutyltin dilaurate, stannous octoate, stannous chloride, and dibutyltin diacetate.

[0009] Preferably, in the above sound-insulating and shock-absorbing sound-insulating cotton, the chain extender includes at least one of ethylene glycol, 1,3-propanediol, and 1,4-butanediol.

[0010] Preferably, in the above sound-insulating and shock-absorbing sound-insulating cotton, the crosslinking agent includes at least one of N,N'-ethylenebismaleimide, N,N'-m-phenylenebismaleimide, N,N'-p-phenylenebismaleimide, and tetrahydrophthalimide.

[0011] Preferably, in the above sound-insulating and shock-absorbing sound-insulating cotton, the curing agent includes an amine curing agent; The amine curing agent includes triethylenetetramine and / or tetraethylenepentamine.

[0012] The present invention also provides a method for preparing a sound-insulating and shock-absorbing sound-insulating cotton, including the following steps: S1. Mix polytetrahydrofuran ether diol, polyhydroxy fatty acid ester diol, polycaprolactone and a solvent. After dispersion, raise the temperature to the reaction temperature, and add diphenylmethane diisocyanate and 1,4-phenylene diisocyanate for reaction to obtain a prepolymer; S2. Mix the prepolymer, modified metal-organic framework material and a solvent. After dispersion, add a chain extender and a crosslinking agent for reaction to obtain an intermediate; S3. Mix the intermediate, a catalyst, a curing agent and a solvent for reaction to obtain a sound insulation cotton.

[0013] Preferably, in the preparation method of the sound insulation cotton with sound insulation and shock absorption as described above, in step S1, the solvent includes at least one of dimethylformamide, tetrahydrofuran and toluene; In step S1, the reaction temperature is 80 - 90 °C, and the reaction time is 2 - 3 h.

[0014] Preferably, in the preparation method of the sound insulation cotton with sound insulation and shock absorption as described above, in step S2, the solvent includes at least one of dimethylformamide, tetrahydrofuran and toluene; In step S2, the reaction temperature is 20 - 30 °C, and the reaction time is 10 - 15 min.

[0015] Preferably, in the preparation method of the sound insulation cotton with sound insulation and shock absorption as described above, in step S3, the solvent includes at least one of dimethylformamide, tetrahydrofuran and toluene; In step S3, the reaction temperature is 80 - 90 °C, and the reaction time is 12 - 48 h.

[0016] Through the above technical solution, the beneficial technical effects of the present invention are: (1)In this application, the sound-insulating cotton for sound insulation and shock absorption is prepared from the following raw materials: polytetrahydrofuran ether glycol, polyhydroxy fatty acid ester glycol, polycaprolactone, diphenylmethane diisocyanate, 1,4-phenylene diisocyanate, modified metal-organic framework material, chain extender, crosslinking agent, catalyst and curing agent. Among them, polytetrahydrofuran ether glycol and polyhydroxy fatty acid ester glycol are flexible chain segments, and diphenylmethane diisocyanate and 1,4-phenylene diisocyanate are rigid chain segments, which can balance the brittleness of the rigid chain segments. Polycaprolactone can improve the compatibility of alcohols and esters. Furthermore, polytetrahydrofuran ether glycol (soft segment) and polycaprolactone (semicrystalline hard segment) form a microphase separation structure, and the shock absorption performance of the material is improved through the movement of chain segments. Diphenylmethane diisocyanate and 1,4-phenylene diisocyanate cooperate to construct a hard segment with a high crosslinking density, enhancing the rigidity of the material. In the present invention, the combination of flexible chain segments and rigid chain segments enables the material to undergo small deformations when subjected to sound wave impacts, absorb part of the sound energy and convert it into heat energy for dissipation, further enhancing the sound insulation performance, and thus having good buffering and sound absorption performance; ensuring the sound insulation and shock absorption effect; in addition, the functional groups on the surface of the polyurethane molecular chain interact with the functional groups on the surface of the modified metal-organic framework material, so that it is distributed in the polyurethane matrix, and a good interfacial bond is formed between the two. The porous structure of the modified metal-organic framework material can increase the propagation path of sound waves in the material, improving the reflection, refraction and absorption efficiency of sound waves, thereby enhancing the sound absorption performance of the material; at the same time, the presence of the modified metal-organic framework material can also change the mechanical properties of the polyurethane, increase the internal friction of the material, and improve its shock absorption performance.

[0017] (2)In this application, the modified metal-organic framework material is modified with dihydromyricetin and maleic anhydride. Dihydromyricetin contains multiple hydroxyl active groups. After mixing and reacting with ZIF-8, it can interact with the chemical groups on the surface of ZIF-8 to form an organic polymer layer coated on the surface of ZIF-8, changing the acoustic properties of the material, such as absorbing more sound waves of specific frequencies; the acid anhydride group active functional group on the maleic anhydride molecule reacts with dihydromyricetin, and at the same time, the hydroxyl group in dihydromyricetin can also undergo chemical crosslinking reactions with the isocyanate group in polyurethane, etc., forming a crosslinked network structure. While enhancing the compatibility and binding force between the modified metal-organic framework material and the polyurethane matrix, it can increase the propagation path and resistance of wave sound, causing the sound waves to be reflected, refracted and scattered multiple times in the pores.

[0018] (3) In this application, the provided method for preparing sound insulation cotton enables the polyurethane matrix and the modified metal-organic framework material to cooperate with each other through the mass ratio of polytetrahydrofuran ether glycol, polyhydroxy fatty acid ester glycol, polycaprolactone, diphenylmethane diisocyanate, 1,4-phenylene diisocyanate, modified metal-organic framework material, chain extender, crosslinking agent, catalyst and curing agent, as well as the technological processes of prepolymer synthesis, composite material preparation and curing reaction. It overcomes the deficiencies of existing sound insulation and shock absorption materials in terms of sound insulation effect, shock absorption performance, mechanical properties and environmental protection, provides a sound insulation and shock absorption cotton with excellent comprehensive performance, improves the flexibility and impact resistance of the material, and at the same time enhances the sound insulation and shock absorption effect of the material, having broad market application prospects. Detailed implementation mode

[0019] The present invention discloses a sound insulation and shock absorption cotton and its preparation method. Those skilled in the art can draw on the content of this article and appropriately modify the process parameters to achieve it. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art, and they are all regarded as included in the present invention. The method and application of the present invention have been described through preferred embodiments. Relevant personnel can obviously make changes or appropriate modifications and combinations to the methods and applications described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0020] In the description of the present invention, a list of items connected by the term "at least one of" or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A, B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, then the phrase "at least one of A, B, C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may include a single element or multiple elements. Item B may include a single element or multiple elements. Item C may include a single element or multiple elements.

[0021] In the ranges disclosed herein, the endpoints and any values are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values or individual point values of each range, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0022] If there is no special instruction, all implementation modes and optional implementation modes of this application can be combined with each other to form new technical solutions.

[0023] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form new technical solutions.

[0024] Unless otherwise specified, the terms "comprising" and "including" mentioned in this application are open-ended and can also be closed-ended. For example, the terms "comprising" and "including" can mean that other components not listed can also be included, or they can mean that only the listed components are included.

[0025] To solve the problem in the prior art that sound insulation cotton cannot have both sound insulation and shock absorption performance, the present invention adopts the following technical solutions: The present invention provides a sound insulation cotton with sound insulation and shock absorption functions, comprising the following raw materials in parts by mass: 30-50 parts of polytetrahydrofuran ether glycol, 10-30 parts of polyhydroxy fatty acid ester glycol, 10-30 parts of polycaprolactone, 20-30 parts of diphenylmethane diisocyanate, 5-15 parts of 1,4-phenylene diisocyanate, 10-30 parts of modified metal-organic framework material, 3-8 parts of chain extender, 2-6 parts of crosslinking agent, 0.1-1 part of catalyst, and 5-15 parts of curing agent.

[0026] As an example, the mass fraction of polytetrahydrofuran ether glycol can be any one of the point values of 30 parts, 33 parts, 35 parts, 38 parts, 40 parts, 42 parts, 45 parts, 48 parts, and 50 parts, or the range value between any two of them.

[0027] As an example, the mass fraction of polyhydroxy fatty acid ester glycol can be any one of the point values of 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, and 30 parts, or the range value between any two of them.

[0028] As an example, the mass fraction of polycaprolactone can be any one of the point values of 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, and 30 parts, or the range value between any two of them.

[0029] As an example, the mass fraction of diphenylmethane diisocyanate can be any one of the point values of 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, and 30 parts, or the range value between any two of them.

[0030] As an example, the mass fraction of 1,4-phenylene diisocyanate can be any one of the point values of 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, and 15 parts, or the range value between any two of them.

[0031] As an example, the mass fraction of the modified metal-organic framework material can be any point value among 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts and 30 parts or a range value between any two of them.

[0032] As an example, the mass fraction of the chain extender can be any point value among 3 parts, 4 parts, 5 parts, 6 parts, 7 parts and 8 parts or a range value between any two of them.

[0033] As an example, the mass fraction of the crosslinking agent can be any point value among 2 parts, 3 parts, 4 parts, 5 parts and 6 parts or a range value between any two of them.

[0034] As an example, the mass fraction of the catalyst can be any point value among 0.1 part, 0.2 part, 0.5 part, 0.6 part, 0.8 part and 1 part or a range value between any two of them.

[0035] As an example, the mass fraction of the curing agent can be any point value among 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts and 15 parts or a range value between any two of them.

[0036] In the present invention, the preparation method of the modified metal-organic framework material includes the following steps: S10. Mix zinc nitrate, 2-methylimidazole and a first solvent and react to obtain ZIF-8; S20. After mixing and dispersing dihydromyricetin and a second solvent, add ZIF-8 and mix to react to obtain an intermediate; S30. After mixing and dispersing maleic anhydride and a third solvent, add the intermediate and mix to react to obtain the modified metal-organic framework material.

[0037] In the present invention, in step S10, the molar ratio of the zinc nitrate to the 2-methylimidazole is 1:2 to 4.

[0038] In the present invention, in step S10, the first solvent includes methanol.

[0039] In the present invention, in step S10, the temperature of the reaction is 10 to 30 °C, and the time of the reaction is 12 to 48 h.

[0040] In the present invention, in step S20, the mass ratio of the dihydromyricetin to the ZIF-8 is 5 to 20:1.

[0041] In the present invention, in step S20, the second solvent includes ethanol.

[0042] In the present invention, in step S20, the temperature of the reaction is 40-60 °C, the time of the reaction is 6-24 h, and the atmosphere of the reaction is nitrogen.

[0043] In the present invention, in step S20, after the reaction, it further includes: washing and drying.

[0044] In the present invention, in step S30, the mass ratio of maleic anhydride to the intermediate is 1-3:1.

[0045] In the present invention, in step S30, the third solvent includes tetrahydrofuran.

[0046] In the present invention, in step S30, the temperature of the reaction is 60-80 °C, and the time of the reaction is 8-24 h.

[0047] In the present invention, in step S20, after the reaction, it further includes: washing and drying.

[0048] In the present invention, the catalyst includes, but is not limited to, organotin catalysts.

[0049] In the present invention, the organotin catalysts include, but are not limited to, at least one of dibutyltin dilaurate, stannous octoate, stannous chloride, and dibutyltin diacetate.

[0050] In the present invention, the chain extender includes, but is not limited to, at least one of ethylene glycol, 1,3-propanediol, and 1,4-butanediol.

[0051] In the present invention, the crosslinking agent includes, but is not limited to, at least one of N,N'-ethylenebismaleimide, N,N'-m-phenylenebismaleimide, N,N'-p-phenylenebismaleimide, and tetrahydrophthalimide.

[0052] In the present invention, in the above sound-insulating and shock-absorbing sound-insulating cotton, the curing agent includes, but is not limited to, amine curing agents; In the present invention, the amine curing agents include, but are not limited to, triethylenetetramine and / or tetraethylenepentamine.

[0053] The present invention also provides a method for preparing a sound-insulating and shock-absorbing sound-insulating cotton, including the following steps: S1. Mix polytetrahydrofuran ether diol, polyhydroxy fatty acid ester diol, polycaprolactone, and a solvent, disperse them, then raise the temperature to the reaction temperature, and add diphenylmethane diisocyanate and 1,4-phenylene diisocyanate for reaction to obtain a prepolymer; S2. Mix the prepolymer, modified metal-organic framework, and a solvent, disperse them, then add a chain extender and a crosslinking agent for reaction to obtain an intermediate; S3. Mix the intermediate, catalyst, curing agent and solvent, and carry out a reaction to obtain the sound insulation cotton.

[0054] In the present invention, in step S1, the solvent includes, but is not limited to, at least one of dimethylformamide, tetrahydrofuran and toluene.

[0055] In the present invention, in step S1, the temperature of the reaction is 80~90 °C, and the time of the reaction is 2~3 h. As an example, the temperature of the reaction can be any point value among 80 °C, 82 °C, 84 °C, 85 °C, 86 °C, 88 °C and 90 °C or the range value between any two of them, and the time of the reaction can be any point value among 2 h, 2.5 h and 3 h or the range value between any two of them.

[0056] In the present invention, in step S2, the solvent includes, but is not limited to, at least one of dimethylformamide, tetrahydrofuran and toluene.

[0057] In the present invention, in step S2, the temperature of the reaction is 20~30 °C, and the time of the reaction is 10~15 min. As an example, the temperature of the reaction can be any point value among 20, 22, 24, 25, 26, 28 and 30 or the range value between any two of them, and the time of the reaction can be any point value among 10, 11, 12, 13, 14 and 15 min or the range value between any two of them.

[0058] In the present invention, in step S3, the solvent includes, but is not limited to, at least one of dimethylformamide, tetrahydrofuran and toluene; In the present invention, in step S3, the temperature of the reaction is 80~90 °C, and the time of the reaction is 12~48 h. As an example, the temperature of the reaction can be any point value among 80 °C, 82 °C, 84 °C, 85 °C, 86 °C, 88 °C and 90 °C or the range value between any two of them, and the time of the reaction can be any point value among 12 h, 15 h, 20 h, 24 h, 25 h, 28 h, 30 h, 32 h, 35 h, 40 h and 48 h or the range value between any two of them.

[0059] The present invention will be further described in detail below through examples. All raw materials used in the examples can be obtained through commercial purchase channels. Example 1

[0060] The sound insulation cotton for sound insulation and shock absorption includes the following raw materials in parts by mass: 35 parts of polytetrahydrofuran ether diol, 20 parts of polyhydroxy fatty acid ester diol, 15 parts of polycaprolactone, 25 parts of diphenylmethane diisocyanate, 13 parts of 1,4-phenylene diisocyanate, 16 parts of modified metal-organic framework material, 5 parts of chain extender ethylene glycol, 2 parts of crosslinking agent N,N'-ethylenebismaleimide, 0.5 part of catalyst dibutyltin dilaurate, and 5 parts of curing agent tetraethylenepentamine; Among them, the preparation method of the modified metal-organic framework material includes the following steps: S10: Disperse zinc nitrate and 2-methylimidazole at a molar ratio of 1:3 in methanol. The dosage ratio of zinc nitrate to methanol is 1 g:15 mL, and react at 20 °C for 24 h to obtain ZIF-8; S20: After mixing and dispersing dihydromyricetin and ethanol, add ZIF-8 and mix. The mass ratio of dihydromyricetin to ZIF-8 is 20:1, and the dosage ratio of dihydromyricetin to ethanol is 1 g:15 mL, and react at 50 °C for 12 h to obtain an intermediate; S30: After mixing and dispersing maleic anhydride and tetrahydrofuran, add the intermediate and mix. The mass ratio of maleic anhydride to the intermediate is 3:1, and the dosage ratio of maleic anhydride to tetrahydrofuran is 1 g:15 mL, and react at 80 °C for 24 h to obtain the modified metal-organic framework material.

[0061] The preparation method of the sound-insulating and shock-absorbing sound-insulating cotton includes the following steps: S1: Mix polytetrahydrofuran ether diol, polyhydroxy fatty acid ester diol, polycaprolactone and toluene. The dosage ratio of polytetrahydrofuran ether diol to toluene is 1 g:10 mL. After dispersion, raise the temperature to 85 °C, add diphenylmethane diisocyanate and 1,4-phenylene diisocyanate and react for 3 h to obtain a prepolymer; S2: Mix the prepolymer, the modified metal-organic framework material and toluene. The dosage ratio of the prepolymer to toluene is 1 g:10 mL. After dispersion, add the chain extender and the crosslinking agent, and react at 25 °C for 15 min to obtain an intermediate; S3: Mix the intermediate, the catalyst, the curing agent and toluene. The dosage ratio of the intermediate to toluene is 1 g:10 mL, and react at 85 °C for 24 h to obtain the sound-insulating cotton. Example 2

[0062] The sound-insulating and shock-absorbing sound-insulating cotton includes the following raw materials in parts by mass: 40 parts of polytetrahydrofuran ether diol, 30 parts of polyhydroxy fatty acid ester diol, 10 parts of polycaprolactone, 29 parts of diphenylmethane diisocyanate, 5 parts of 1,4-phenylene diisocyanate, 12 parts of modified metal-organic framework material, 3 parts of chain extender ethylene glycol, 3 parts of crosslinking agent N,N'-ethylenebismaleimide, 1 part of catalyst dibutyltin dilaurate, and 15 parts of curing agent tetraethylenepentamine; Among them, the preparation method of the modified metal-organic framework material includes the following steps: S10: Disperse zinc nitrate and 2-methylimidazole at a molar ratio of 1:3 in methanol. The dosage ratio of zinc nitrate to methanol is 1 g: 15 mL, and react at 20 °C for 24 h to obtain ZIF-8; S20: After mixing and dispersing dihydromyricetin and ethanol, add ZIF-8 and mix. The mass ratio of dihydromyricetin to ZIF-8 is 10:1, and the dosage ratio of dihydromyricetin to ethanol is 1 g: 15 mL, and react at 50 °C for 12 h to obtain an intermediate; S30: After mixing and dispersing maleic anhydride and tetrahydrofuran, add the intermediate and mix. The mass ratio of maleic anhydride to the intermediate is 1:1, and the dosage ratio of maleic anhydride to tetrahydrofuran is 1 g: 15 mL, and react at 60 °C for 24 h to obtain the modified metal-organic framework material.

[0063] The preparation method of the sound insulation and shock absorption sound insulation cotton includes the following steps: S1: Mix poly(tetrahydrofuran) glycol, polyhydroxy fatty acid ester glycol, polycaprolactone and toluene, and after dispersion, the dosage ratio of poly(tetrahydrofuran) glycol to toluene is 1 g: 10 mL. Heat up to 85 °C, add diphenylmethane diisocyanate and 1,4-phenylene diisocyanate and react for 3 h to obtain a prepolymer; S2: Mix the prepolymer, the modified metal-organic framework material and toluene. The dosage ratio of the prepolymer to toluene is 1 g: 10 mL. After dispersion, add a chain extender and a crosslinking agent, and react at 25 °C for 15 min to obtain an intermediate; S3: Mix the intermediate, a catalyst, a curing agent and toluene. The dosage ratio of the intermediate to toluene is 1 g: 10 mL, and react at 85 °C for 24 h to obtain the sound insulation cotton. Example 3

[0064] The sound insulation and shock absorption sound insulation cotton includes the following raw materials in parts by mass: 45 parts of poly(tetrahydrofuran) glycol, 20 parts of polyhydroxy fatty acid ester glycol, 25 parts of polycaprolactone, 25 parts of diphenylmethane diisocyanate, 12 parts of 1,4-phenylene diisocyanate, 10 parts of the modified metal-organic framework material, 5 parts of the chain extender ethylene glycol, 4 parts of the crosslinking agent N,N'-ethylenebismaleimide, 0.3 part of the catalyst dibutyltin dilaurate and 5 parts of the curing agent tetraethylenepentamine; Among them, the preparation method of the modified metal-organic framework material includes the following steps: S10: Disperse zinc nitrate and 2-methylimidazole at a molar ratio of 1:3 in methanol. The dosage ratio of zinc nitrate to methanol is 1 g: 15 mL, and react at 20 °C for 24 h to obtain ZIF-8; S20. After mixing and dispersing dihydromyricetin and ethanol, ZIF-8 is added and mixed. The mass ratio of dihydromyricetin to ZIF-8 is 5:1, and the dosage ratio of dihydromyricetin to ethanol is 1 g: 15 mL. The reaction is carried out at 50 °C for 12 h to obtain an intermediate; S30. After mixing and dispersing maleic anhydride and tetrahydrofuran, the intermediate is added and mixed. The mass ratio of maleic anhydride to the intermediate is 2:1, and the dosage ratio of maleic anhydride to tetrahydrofuran is 1 g: 15 mL. The reaction is carried out at 60 °C for 24 h to obtain a modified metal-organic framework material.

[0065] A preparation method of sound-insulating and shock-absorbing sound-insulating cotton includes the following steps: S1. Poly(tetrahydrofuran) glycol, poly(hydroxyalkanoate) glycol, polycaprolactone and toluene are mixed and dispersed. The dosage ratio of poly(tetrahydrofuran) glycol to toluene is 1 g: 10 mL. The temperature is raised to 85 °C, and diphenylmethane diisocyanate and 1,4-phenylene diisocyanate are added for reaction for 3 h to obtain a prepolymer; S2. The prepolymer, the modified metal-organic framework material and toluene are mixed. The dosage ratio of the prepolymer to toluene is 1 g: 10 mL. After dispersion, a chain extender and a crosslinking agent are added, and the reaction is carried out at 25 °C for 15 min to obtain an intermediate; S3. The intermediate, a catalyst, a curing agent and toluene are mixed. The dosage ratio of the intermediate to toluene is 1 g: 10 mL. The reaction is carried out at 85 °C for 24 h to obtain sound-insulating cotton.

[0066] Comparative Example 1 The sound-insulating and shock-absorbing sound-insulating cotton is different from that of Example 1 in that: It does not contain the modified metal-organic framework material.

[0067] The rest are the same as those in Example 1.

[0068] Comparative Example 2 The sound-insulating and shock-absorbing sound-insulating cotton is different from that of Example 1 in that: The metal-organic framework material ZIF-8 is not modified.

[0069] The rest are the same as those in Example 1.

[0070] Comparative Example 3 The sound-insulating and shock-absorbing sound-insulating cotton is different from that of Example 1 in that: It does not contain poly(hydroxyalkanoate) glycol.

[0071] The rest are the same as those in Example 1.

[0072] Test Example Elongation at break: Tested in accordance with GB / T9641; Compressive strength: Tested in accordance with GB / T8813; Sound absorption coefficient: Tested in accordance with GB / T18696.1; The above test results are shown in Table 1:

[0073] As can be seen from Table 1, the sound insulation cotton for sound insulation and shock absorption in the examples shows the best performance in terms of elongation at break, compressive strength and sound absorption coefficient compared with the comparative examples. This is attributed to the synergistic effect of its raw material ratio and the modified metal-organic framework material, which makes the polyurethane matrix and the modified metal-organic framework material closely connected to form a stable network structure, thereby enhancing the mechanical properties and sound insulation effect of the material.

[0074] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A sound-insulating cotton for sound insulation and shock absorption, characterized in that, It comprises raw materials in the following parts by mass: 30 - 50 parts of polytetrahydrofuran ether diol, 10 - 30 parts of polyhydroxy fatty acid ester diol, 10 - 30 parts of polycaprolactone, 20 - 30 parts of diphenylmethane diisocyanate, 5 - 15 parts of 1,4 - phenylene diisocyanate, 10 - 30 parts of modified metal - organic framework material, 3 - 8 parts of chain extender, 2 - 6 parts of cross - linker, 0.1 - 1 part of catalyst and 5 - 15 parts of curing agent.

2. The sound-insulating cotton for sound insulation and shock absorption according to claim 1, characterized in that, The preparation method of the modified metal - organic framework material comprises the following steps: S10: Mix zinc nitrate, 2 - methylimidazole and a first solvent and react to obtain ZIF - 8; S20: After mixing and dispersing dihydromyricetin and a second solvent, add ZIF - 8 and mix to react to obtain an intermediate; S30: After mixing and dispersing maleic anhydride and a third solvent, add the intermediate and mix to react to obtain the modified metal - organic framework material.

3. The sound-insulating cotton for sound insulation and shock absorption according to claim 2, wherein, In step S10, the molar ratio of zinc nitrate to 2 - methylimidazole is 1:2 - 4; In step S10, the first solvent includes methanol; In step S10, the reaction temperature is 10 - 30 °C and the reaction time is 12 - 48 h; In step S20, the mass ratio of dihydromyricetin to ZIF - 8 is 5 - 20:1; In step S20, the second solvent includes ethanol; In step S20, the reaction temperature is 40 - 60 °C, the reaction time is 6 - 24 h; the reaction atmosphere is nitrogen; In step S30, the mass ratio of maleic anhydride to the intermediate is 1 - 3:1; In step S30, the third solvent includes tetrahydrofuran; In step S30, the reaction temperature is 60 - 80 °C and the reaction time is 8 - 24 h.

4. The sound-insulating cotton for sound insulation and shock absorption according to claim 1, characterized in that, The chain extender includes at least one of ethylene glycol, 1,3 - propanediol and 1,4 - butanediol; the catalyst includes an organotin - based catalyst; The organotin - based catalyst includes at least one of dibutyltin dilaurate, stannous octoate, stannous chloride and dibutyltin diacetate.

5. The sound insulation cotton for sound insulation and shock absorption according to claim 1, wherein The cross - linker includes at least one of N,N’ - ethylenebismaleimide, N,N’ - m - phenylene bismaleimide, N,N’ - p - phenylene bismaleimide and tetrahydrophthalimide.

6. The sound insulation cotton for sound insulation and shock absorption according to claim 1, characterized in that, The curing agent includes an amine - based curing agent; The amine - based curing agent includes triethylenetetramine and / or tetraethylenepentamine.

7. The preparation method of the sound insulation cotton with sound insulation and shock absorption according to any one of claims 1 to 6, characterized in that, It comprises the following steps: S1: Mix polytetrahydrofuran ether diol, polyhydroxy fatty acid ester diol, polycaprolactone and a fourth solvent, disperse, heat up to the reaction temperature, and add diphenylmethane diisocyanate and 1,4 - phenylene diisocyanate to react to obtain a prepolymer; S2: Mix the prepolymer, the modified metal - organic framework material and a fifth solvent, disperse, and then add the chain extender and the cross - linker to react to obtain an intermediate; S3: Mix the intermediate, the catalyst, the curing agent and a sixth solvent to react to obtain the sound - insulating cotton.

8. The preparation method of the sound insulation cotton for sound insulation and shock absorption according to claim 7, characterized in that, In step S1, the fourth solvent includes at least one of dimethylformamide, tetrahydrofuran and toluene; In step S1, the temperature of the reaction is 80 to 90 °C, and the time of the reaction is 2 to 3 h.

9. The preparation method of the sound insulation cotton with sound insulation and shock absorption according to claim 7, characterized in that, In step S2, the fifth solvent includes at least one of dimethylformamide, tetrahydrofuran, and toluene; In step S2, the temperature of the reaction is 20 to 30 °C, and the time of the reaction is 10 to 15 min.

10. The preparation method of the sound-insulating and shock-absorbing sound-insulating cotton according to claim 7, characterized in that, In step S3, the sixth solvent includes at least one of dimethylformamide, tetrahydrofuran, and toluene; In step S3, the temperature of the reaction is 80 to 90 °C, and the time of the reaction is 12 to 48 h.

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