Sound insulation board based on bionic honeycomb reinforcement and preparation method thereof

Abstract

The invention discloses a sound insulation board based on bionic honeycomb reinforcement and a preparation method thereof, belongs to the technical field of sound insulation board preparation, aims to solve the technical problem that the sound insulation performance and the heat insulation performance of a sound insulation board in the prior art need to be further improved, and particularly comprises two panels and a sound insulation layer located between the two panels. The sound insulation layer is composed of a honeycomb-shaped supporting material and sound insulation foam. The prepared modified microspheres and modified polysiloxane with a fluorine group as a branched chain and rich in a silicon hydrogen group are mixed and heated in a support material, and under the catalysis of tripentafluorophenylborane, the silicon hydrogen group on the modified polysiloxane, the modified microspheres and the silicon oxygen group on the support material react to generate a cross-linked structure and generate methane; the sound insulation layer is combined with a panel, and then the sound insulation board is finally prepared and obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of sound insulation board preparation, and in particular to a sound insulation board based on bionic honeycomb reinforcement and a preparation method thereof. Background Art

[0002] The development history of sound insulation boards has been closely centered around improving sound insulation and heat insulation performance. In the early days, dense materials such as gypsum boards and wooden boards were mostly used to achieve physical barriers by thickening the structure. However, they were heavy and had high thermal conductivity, resulting in limited sound insulation and heat insulation effects. Subsequently, material design entered the porous and composite stage, and the introduction of lightweight sound-absorbing layers such as glass wool and polyurethane foam significantly improved the sound wave scattering and heat flow delay effects, achieving a certain degree of synergistic heat and sound insulation.

[0003] However, traditional filling structures still have shortcomings in terms of interface stability and durability. In recent years, sound insulation panels have moved towards multifunctional integration. By foaming supporting materials to construct a porous frame, combining surface-modified microspheres with functional coatings, the coordinated optimization of micro and macro structures is achieved, and the sound and heat shielding performance is significantly improved on the basis of lightweight. In the future, sound insulation panels will continue to integrate intelligent response, phase change regulation and green and low-carbon concepts, and develop towards more efficient and intelligent thermal and acoustic regulation.

[0004] For example, the prior art CN114716216B discloses a lightweight sound insulation board and a preparation method thereof, comprising a base layer, an interlayer and a nano-coating layer. The interlayer is arranged on the surface of the base layer, and the nano-coating layer is arranged on the surface of the interlayer. Calculated by weight, the raw materials of the base layer include 40-70 parts of silicate cement, 10-20 parts of sulfoaluminate cement, 20-50 parts of fly ash, 3-10 parts of hydrogen peroxide, 40-70 parts of quartz sand, 8-10 parts of slag powder, 1-5 parts of polypropylene fiber, 1-8 parts of expanded perlite, 0.5-9 parts of additives and 20-50 parts of water. By adjusting the formula of the base layer, it is beneficial to further reduce the dead weight of the board and increase its sound insulation volume. Adding an interlayer and a nano-coating layer to the surface of the base can effectively improve the durability of the lightweight sound insulation board.

[0005] However, the above invention merely adds an interlayer and a nano-coating layer to the surface of the base to enhance the performance of the sound insulation board. While the basic function of the sound insulation board can be achieved through the layered structure, the overall performance improvement is limited due to the primary reliance on physical coating and conventional foaming, lacking effective chemical or mechanical synergy between the structures. Furthermore, although the base layer contains foaming components, the pore structure is relatively disordered, limiting the thermal insulation and sound absorption effects. At the same time, the interlayer and the nano-coating layer are mainly simply superimposed, the interface bonding force is weak, and interlayer peeling is prone to occur, which affects the long-term stability. As a result, the comprehensive performance of this sound insulation board, such as sound insulation, heat insulation and flame retardancy, needs to be further improved. Summary of the Invention

[0006] The purpose of the present invention is to provide a sound insulation board based on bionic honeycomb reinforcement and a preparation method thereof, so as to solve the technical problem in the prior art that the sound insulation performance and heat insulation performance of the sound insulation board need to be further improved.

[0007] The object of the present invention can be achieved by the following technical solution: a sound insulation board based on bionic honeycomb reinforcement includes two panels and a sound insulation layer located between the two panels, wherein the sound insulation layer is composed of a honeycomb supporting material and sound insulation foam; The sound insulation foam is obtained by mixing modified polysiloxane and modified hollow microspheres and foaming them in the honeycomb structure of the supporting material; The preparation method of the modified polysiloxane comprises the following steps: adding 1,3,5,7-tetramethylcyclotetrasiloxane, trifluoropropylmethylcyclotrisiloxane and N,N-dimethylformamide into a reaction kettle, raising the temperature of the reaction kettle to 100-120° C., adding sodium hydroxide into the reaction kettle, keeping the temperature for reaction for 4-5 hours, adding 1,1,3,3-tetramethyldisiloxane into the reaction kettle, keeping the temperature for reaction for 2-3 hours, and performing post-processing to obtain the modified polysiloxane.

[0008] The reaction equation for preparing modified polysiloxane is:

[0009] Where: .

[0010] Furthermore, the preparation method of the support material includes the following steps: A1. Add hydroxyl-terminated methyl vinyl silicone oil, dichloro(dicyclopentadiene)platinum, and tetrahydrofuran to a reactor. After nitrogen is introduced into the reactor, the temperature is raised to 40-60° C., and trimethoxysilane is added to the reactor. The reaction is kept at this temperature for 60-80 minutes, and post-processed to obtain modified siloxane. The reaction equation for preparing modified siloxane is:

[0011] The reaction principle for preparing modified siloxane is as follows: the vinyl group on the molecular chain of hydroxy-terminated methyl vinyl silicone oil and the silicon-hydrogen bond of trimethoxysilane undergo a silylation reaction under the catalysis of dichloro(dicyclopentadiene)platinum. The platinum catalyst activates the silicon-hydrogen bond, causing it to attack the π bond of the vinyl group to form a carbon-silicon bond. At the same time, the hydrogen atom is transferred to the other carbon of the vinyl group to generate a saturated alkane structure to obtain modified siloxane.

[0012] A2. Add modified siloxane, stannous octoate, N,N-dimethylformamide and a catalyst to a reactor. After nitrogen protection, raise the temperature of the reactor to 40-60° C. and add a calculated amount of dimethylbiphenyl diisocyanate to the reactor. After keeping the temperature for 2-4 hours, post-process and obtain a gel material. The reaction equation for preparing the gel material is:

[0013] Where: .

[0014] The reaction principle for preparing the gel material is as follows: the hydroxyl group at the end of the modified siloxane molecule chain and the two isocyanate groups of dimethyldiphenyl diisocyanate undergo a nucleophilic addition reaction under the catalysis of dibutyltin dilaurate. The electrophilicity of the isocyanate group causes the hydroxyl group to attack to form a cross-linked network structure, and the gel material is generated under the promotion of stannous octoate.

[0015] A3. Fill the gel material into a honeycomb mold preheated to 30-40°C, add foaming liquid into the mold, keep it warm and foam for 1-2 minutes, and then post-process it to obtain the support material.

[0016] The reaction principle for preparing the gel material is as follows: under the catalysis of triethylenediamine, water molecules react with isocyanate groups to generate unstable aminocarbamic acid. The intermediate rapidly decomposes, releasing carbon dioxide gas and forming amine groups at the same time. The released carbon dioxide gas forms bubbles in the polymer, driving the material to foam. The generated amine further reacts with another molecule of isocyanate to enhance structural stability, and finally the support material is prepared.

[0017] Furthermore, in step A1, the amount ratio of the hydroxyl-terminated methyl vinyl silicone oil, dichloro(dicyclopentadiene)platinum, tetrahydrofuran and trimethoxysilane is 8-10 g:0.2-0.3 g:40-50 mL:1-2 g, and the post-treatment includes: after the reaction is completed, transferring the reaction solution to a vacuum dryer at a temperature of 60-80 ° C, and vacuum drying until no liquid is extracted to obtain modified siloxane; Furthermore, in step A2, the modified siloxane, stannous octoate, N,N-dimethylformamide and catalyst are used in a ratio of 10-12 g:0.1 g:40-50 mL:0.3 g, wherein the catalyst is dibutyltin dilaurate, and the amount of dimethylbiphenyl diisocyanate is 0.55-0.60 times the molar amount of hydroxyl groups in the modified siloxane. The post-treatment includes: after the reaction is completed, transferring the reaction solution to a vacuum dryer at a temperature of 60-80° C., and vacuum drying until no liquid is extracted to obtain a gel material; Furthermore, in step A3, the ratio of the amount of the gel material and the foaming liquid is 8-10g:10-12mL, wherein the foaming liquid is obtained by mixing deionized water and triethylenediamine in a ratio of 10mL:1-2g, the thickness of the honeycomb template is 20-30mm, and the side length is 2-3m. The post-processing includes: after foaming is completed, transferring the mold to a vacuum drying oven at a temperature of 60-80°C, vacuum drying to constant weight, and demolding to obtain the support material.

[0018] Furthermore, the preparation method of the modified hollow microspheres comprises the following steps: B1. Add the hollow microspheres and 3-5 wt% sodium hydroxide aqueous solution into a reactor and stir. Raise the temperature of the reactor to 60-80° C. and keep the temperature for 1-2 hours. Post-treat to obtain activated hollow microspheres. B2. Add activated hollow microspheres, anhydrous ethanol and dibutyltin dilaurate into a reactor. After nitrogen protection, increase the temperature of the reactor to 40-60°C and add 3-isocyanatepropyltrimethoxysilane into the reactor. After keeping the temperature for 40-60 minutes, post-treat to obtain modified hollow microspheres.

[0019] The reaction principle for preparing modified hollow microspheres is as follows: under alkaline conditions, hydroxyl structures appear on the surface of the hollow microspheres to obtain activated hollow microspheres, and then by reacting with the isocyanate groups on 3-isocyanatepropyltrimethoxysilane under heating conditions, siloxy groups are introduced on the surface of the microspheres to obtain modified hollow microspheres.

[0020] Furthermore, in step B1, the ratio of the hollow microspheres to the 3-5wt% sodium hydroxide aqueous solution is 1-2g:10-12mL, and the post-treatment includes: after the reaction is completed, after the temperature of the reactor is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, the filter cake is washed 3-5 times with anhydrous ethanol and deionized water, and the filter cake is transferred to a drying oven at a temperature of 60-80°C and vacuum dried until the filter cake has a constant weight to obtain activated hollow microspheres; Furthermore, in step B2, the amount ratio of the modified siloxane, anhydrous ethanol, dibutyltin dilaurate and 3-isocyanatepropyltrimethoxysilane is 1-2g:20-30mL:0.2g:0.5-0.8g, and the post-treatment includes: after the reaction is completed, after the temperature of the reactor is lowered to room temperature, the reaction liquid is filtered to collect the filter cake, the filter cake is washed 3-5 times with anhydrous ethanol and deionized water, and the filter cake is transferred to a drying oven at a temperature of 60-80°C and vacuum dried until the filter cake has a constant weight to obtain modified hollow microspheres.

[0021] The present invention also proposes a method for preparing a sound insulation board based on bionic honeycomb reinforcement, wherein a supporting material is placed on a panel, modified polysiloxane, modified hollow microspheres and tris(pentafluorophenyl)borane are filled into the honeycomb structure of the supporting material, and a mold is used to fix another panel so that the gap between it and the supporting material is 2-3 mm. The mold is transferred to an oven, the oven temperature is increased to 60-80°C, and the sound insulation board is obtained after heat preservation and foaming until the gap is completely filled.

[0022] The reaction principle for preparing the sound insulation layer is as follows: the modified polysiloxane with silicon hydrogen groups is activated by tris-pentafluorophenyl borane and then reacts with the modified hollow microspheres and the silicon oxygen groups on the surface of the support material under the promotion of heating, so that methane is eliminated and the siloxane chain segments are cross-linked, thereby forming a three-dimensional organic silicon network. Through gas foaming, the material is filled inside the support material to prepare the sound insulation layer.

[0023] Furthermore, the usage ratio of the modified polysiloxane, the modified hollow microspheres and trispentafluorophenylborane is 8-10 g: 1-2 g: 0.1-0.2 g.

[0024] The present invention has the following beneficial effects: The present invention first forms a highly cross-linked polysiloxane through an isocyanate-terminated long-chain structure obtained through silicon-hydrogen addition reaction and polymerization. The formation of this structure enables the material to have strong intermolecular interconnectivity and provides a solid supporting foundation; secondly, by utilizing the reaction of silicon-hydrogen groups with modified microspheres, a porous honeycomb structure is generated inside the supporting material. This porous structure not only provides space for blocking and absorbing the propagation of sound waves, but also effectively reduces the path of heat conduction and enhances the thermal insulation effect. During the preparation process, the surface modification of the microspheres and the strengthening of the supporting material further enhance the structural stability of the material through cross-linking, so that the sound insulation board has higher strength and pressure resistance, thereby improving its stability and durability in long-term use. In addition, the combination of the supporting material and the modified microspheres enables the entire material to have good sound wave absorption capacity, which greatly improves the sound insulation performance by dispersing and blocking the propagation path of sound waves.

[0025] The sound insulation board prepared by the present invention incorporates a highly thermally stable silicon-oxygen skeleton, which rapidly forms a dense inorganic protective layer when heated, blocking the diffusion of heat and oxygen and significantly inhibiting the occurrence and spread of combustion. Simultaneously, the highly cross-linked network structure enhances the overall thermal inertia and structural stability, making the material less susceptible to decomposition or deformation at high temperatures, fundamentally improving its flame retardancy. The organic silicon and fluorine groups enriched on the material's surface impart low surface energy properties, which, combined with the porous rough structure, form a micro-nanoscale hydrophobic interface, making it difficult for water droplets to adhere and penetrate, exhibiting excellent hydrophobic properties. This hydrophobicity not only enhances the material's resistance to moisture and liquids, but also effectively blocks external moisture from interfering with the pyrolysis process, further stabilizing its flame retardant effect.

[0026] The supporting material and reinforcing layer of the sound insulation board prepared by the present invention achieve molecular-level connection through a highly cross-linked silicon-oxygen structure, forming a stable three-dimensional network skeleton, so that the functional layers are tightly interlocked, effectively preventing the occurrence of problems such as delamination, bulging or cracking. There is a good interface match between the modified microspheres and the polysiloxane matrix, and the interface bonding strength is enhanced through chemical bonding between functional groups, which not only improves the overall mechanical properties of the material, but also improves the structural integrity under composite actions such as shear and bending; in addition, the design of the porous honeycomb structure provides a rich interface contact area, so that adjacent layers can achieve stronger mechanical interlocking and effectively disperse external force impact. The good interlayer bonding also improves the sealing and overall stability of the material, so that it can still maintain structural continuity and functional reliability in thermal expansion and contraction, humidity or vibration environments. Overall, the material achieves excellent interlayer bonding through the dual mechanisms of chemical cross-linking and structural interlocking, providing reliable guarantee for its long-term application under complex service conditions. DETAILED DESCRIPTION

[0027] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] The hydroxyl-terminated methyl vinyl silicone oil used in the present invention was purchased from Anhui Mingyi Silicon Industry Co., Ltd., with the product number MY1203V; The hollow microspheres used in the present invention were purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. with the product number G490114. Example 1

[0029] This embodiment provides a method for preparing a supporting material for preparing a sound insulation board based on bionic honeycomb reinforcement, comprising the following steps: Step I: Preparation of modified siloxane Weigh: 80.0 g of hydroxyl-terminated methyl vinyl silicone oil, 2.0 g of dichloro(dicyclopentadiene)platinum and 400.0 mL of tetrahydrofuran were added to a reactor. After nitrogen protection was introduced into the reactor, the temperature was raised to 40° C. and 10.0 g of trimethoxysilane was added to the reactor. The reaction was kept warm for 60 minutes. After the reaction was completed, the reaction solution was transferred to a vacuum dryer at 60° C. and vacuum dried until no liquid was recovered to obtain modified siloxane.

[0030] Step II: Preparation of gel material Weigh: 60.0 g of modified siloxane, 0.6 g of stannous octoate, 240.0 mL of N,N-dimethylformamide and 1.8 g of dibutyltin dilaurate are added to a reactor. After nitrogen protection, the temperature of the reactor is raised to 40°C and 0.55 times the molar amount of hydroxyl groups in the modified siloxane is added to the reactor. After the reaction is kept warm for 2 hours, after the reaction is completed, the reaction liquid is transferred to a vacuum dryer at a temperature of 60°C and vacuum dried until no liquid is extracted to obtain a gel material.

[0031] Step III: Prepare support material Weigh: 100.0 mL of deionized water and 10.0 g of triethylenediamine and mix to obtain a foaming solution; Weigh: 48.0 g of gel material is filled into a honeycomb mold with a thickness of 20 mm and a side length of 2 m, which is preheated to 30°C, and 60.0 mL of foaming liquid is added to the mold. After keeping warm and foaming for 1 minute, after foaming is completed, the mold is transferred to a vacuum drying oven at a temperature of 60°C, vacuum dried to constant weight, and demolded to obtain the support material. Example 2

[0032] This embodiment provides a method for preparing a supporting material for preparing a sound insulation board based on bionic honeycomb reinforcement, comprising the following steps: Step I: Preparation of modified siloxane Weigh: 100.0 g of hydroxyl-terminated methyl vinyl silicone oil, 3.0 g of dichloro(dicyclopentadiene)platinum and 500.0 mL of tetrahydrofuran were added to a reactor. After nitrogen protection was introduced into the reactor, the temperature was raised to 60° C. and 20.0 g of trimethoxysilane was added to the reactor. The reaction was kept warm for 80 minutes. After the reaction was completed, the reaction solution was transferred to a vacuum dryer at 80° C. and vacuum dried until no liquid was recovered to obtain modified siloxane.

[0033] Step II: Preparation of gel material Weigh: 72.0 g of modified siloxane, 0.6 g of stannous octoate, 300.0 mL of N,N-dimethylformamide and 1.8 g of dibutyltin dilaurate are added to a reactor. After nitrogen protection, the temperature of the reactor is raised to 60°C and 0.60 times the molar amount of hydroxyl groups in the modified siloxane is added to the reactor. After the reaction is kept warm for 4 hours, after the reaction is completed, the reaction liquid is transferred to a vacuum dryer at a temperature of 80°C and vacuum dried until no liquid is extracted to obtain a gel material.

[0034] Step III: Prepare support material Weigh: 100.0 mL of deionized water and 20.0 g of triethylenediamine and mix to obtain a foaming solution; Weigh: 60.0 g of gel material is filled into a honeycomb mold with a thickness of 30 mm and a side length of 3 m, which is preheated to 40°C, and 72.0 mL of foaming liquid is added to the mold. After keeping warm and foaming for 2 minutes, after foaming is completed, the mold is transferred to a vacuum drying oven at a temperature of 80°C, vacuum dried to constant weight, and demolded to obtain the support material. Example 3

[0035] This embodiment provides a method for preparing a supporting material for preparing a sound insulation board based on bionic honeycomb reinforcement, comprising the following steps: Step I: Preparation of modified siloxane Weigh: 90.0 g of hydroxyl-terminated methyl vinyl silicone oil, 2.5 g of dichloro(dicyclopentadiene)platinum and 450.0 mL of tetrahydrofuran were added to a reactor. After nitrogen protection was introduced into the reactor, the temperature was raised to 50° C. and 16.0 g of trimethoxysilane was added to the reactor. The reaction was kept warm for 70 minutes. After the reaction was completed, the reaction solution was transferred to a vacuum dryer at a temperature of 70° C. and vacuum dried until no liquid was recovered to obtain modified siloxane.

[0036] Step II: Preparation of gel material Weigh: 64.0 g of modified siloxane, 0.6 g of stannous octoate, 270.0 mL of N,N-dimethylformamide and 1.8 g of dibutyltin dilaurate are added to a reactor. After nitrogen protection, the temperature of the reactor is raised to 50°C and 0.57 times the molar amount of hydroxyl groups in the modified siloxane is added to the reactor. After the reaction is kept warm for 3 hours, after the reaction is completed, the reaction liquid is transferred to a vacuum dryer at a temperature of 70°C and vacuum dried until no liquid is extracted to obtain a gel material.

[0037] Step III: Prepare support material Weigh: 100.0 mL of deionized water and 16.0 g of triethylenediamine to obtain a foaming solution; Weigh: 54.0 g of gel material is filled into a honeycomb mold with a thickness of 25 mm and a side length of 2.5 m, which is preheated to 35°C, and 64.0 mL of foaming liquid is added to the mold. After keeping warm and foaming for 1.5 minutes, after foaming is completed, the mold is transferred to a vacuum drying oven at a temperature of 70°C, vacuum dried to constant weight, and demolded to obtain support material 1. Example 4

[0038] This embodiment provides a method for preparing modified hollow microspheres for preparing a sound insulation board based on bionic honeycomb reinforcement, comprising the following steps: Step ①: Preparation of activated hollow microspheres Weigh: 10.0 g of hollow microspheres and 100.0 mL of 3 wt% sodium hydroxide aqueous solution were added to the reactor and stirred. The temperature of the reactor was raised to 60 ° C and kept warm for 1 hour. After the reaction was completed, the temperature of the reactor was lowered to room temperature, the reaction liquid was filtered to collect the filter cake, and the filter cake was washed 3 times with anhydrous ethanol and deionized water. The filter cake was transferred to a drying oven at a temperature of 60 ° C and vacuum dried until the filter cake had a constant weight to obtain activated hollow microspheres.

[0039] Step ②, preparation of modified hollow microspheres Weigh: 10.0 g activated hollow microspheres, 200.0 mL anhydrous ethanol and 2.0 g dibutyltin dilaurate were added to the reactor. After nitrogen protection, the reactor temperature was raised to 40 ° C and 5.0 g 3-isocyanatepropyltrimethoxysilane was added to the reactor. After the reaction was kept warm for 40 minutes, after the reaction was completed, the reactor temperature was lowered to room temperature, the reaction liquid was filtered to collect the filter cake, and the filter cake was washed 3 times with anhydrous ethanol and deionized water. The filter cake was transferred to a drying oven at a temperature of 60 ° C and vacuum dried until the filter cake had a constant weight to obtain modified hollow microspheres. Example 5

[0040] This embodiment provides a method for preparing modified hollow microspheres for preparing a sound insulation board based on bionic honeycomb reinforcement, comprising the following steps: Step ①: Preparation of activated hollow microspheres Weigh: 20.0 g of hollow microspheres and 120.0 mL of 5 wt% sodium hydroxide aqueous solution were added to the reactor and stirred. The temperature of the reactor was raised to 80 ° C. and the reaction was kept warm for 2 hours. After the reaction was completed, the temperature of the reactor was lowered to room temperature, the reaction liquid was filtered to collect the filter cake, and the filter cake was washed 5 times with anhydrous ethanol and deionized water. The filter cake was transferred to a drying oven at a temperature of 80 ° C and vacuum dried until the filter cake had a constant weight to obtain activated hollow microspheres.

[0041] Step ②, preparation of modified hollow microspheres Weigh: 20.0 g activated hollow microspheres, 300.0 mL anhydrous ethanol and 2.0 g dibutyltin dilaurate were added to the reactor. After nitrogen protection, the reactor temperature was raised to 60 ° C and 8.0 g 3-isocyanatepropyltrimethoxysilane was added to the reactor. After the reaction was kept warm for 60 minutes, after the reaction was completed, the reactor temperature was lowered to room temperature, the reaction liquid was filtered to collect the filter cake, and the filter cake was washed 5 times with anhydrous ethanol and deionized water. The filter cake was transferred to a drying oven at a temperature of 80 ° C and vacuum dried until the filter cake had a constant weight to obtain modified hollow microspheres. Example 6

[0042] This embodiment provides a method for preparing modified hollow microspheres for preparing a sound insulation board based on bionic honeycomb reinforcement, comprising the following steps: Step ①: Preparation of activated hollow microspheres Weigh: 16.0 g of hollow microspheres and 120.0 mL of 5 wt% sodium hydroxide aqueous solution were added to the reactor and stirred. The temperature of the reactor was raised to 70 ° C. and the reaction was kept warm for 2 hours. After the reaction was completed, the temperature of the reactor was lowered to room temperature, the reaction liquid was filtered to collect the filter cake, and the filter cake was washed 4 times with anhydrous ethanol and deionized water. The filter cake was transferred to a drying oven at a temperature of 70 ° C and vacuum dried until the filter cake had a constant weight to obtain activated hollow microspheres.

[0043] Step ②, preparation of modified hollow microspheres Weigh: 15.0 g activated hollow microspheres, 240.0 mL anhydrous ethanol and 2.0 g dibutyltin dilaurate were added to the reactor. After nitrogen protection, the reactor temperature was raised to 50 ° C. and 7.0 g 3-isocyanatepropyltrimethoxysilane was added to the reactor. After the reaction was kept warm for 50 minutes, after the reaction was completed, the reactor temperature was lowered to room temperature, the reaction liquid was filtered to collect the filter cake, and the filter cake was washed 4 times with anhydrous ethanol and deionized water. The filter cake was transferred to a drying oven at a temperature of 70 ° C. and vacuum dried until the filter cake had a constant weight to obtain modified hollow microspheres. Example 7

[0044] This embodiment provides a method for preparing a sound insulation board based on bionic honeycomb reinforcement, comprising the following steps: Step 1: Preparation of modified polysiloxane Weigh: 40.0g 1,3,5,7-tetramethylcyclotetrasiloxane, 60.0g trifluoropropylmethylcyclotrisiloxane and 200.0mL N,N-dimethylformamide are added to the reactor. After the temperature of the reactor is raised to 100°C, 1.0g sodium hydroxide is added to the reactor. After the reaction is kept warm for 4 hours, 10.0g 1,1,3,3-tetramethyldisiloxane is added to the reactor and the reaction is kept warm for 2 hours. After the reaction is completed, the reaction liquid is transferred to a vacuum dryer at a temperature of 60°C and vacuum dried until no liquid is extracted to obtain modified polysiloxane.

[0045] Step 2: Prepare the sound insulation board The supporting material prepared in Example 1 was placed on a panel, and 80.0 g of modified polysiloxane, 10.0 g of modified hollow microspheres prepared in Example 4, and 1.0 g of trispentafluorophenylborane were filled into the honeycomb structure of the supporting material. Another panel was fixed with a mold so that the gap between it and the supporting material was 2 mm. The mold was transferred to an oven, the oven temperature was raised to 60°C, and the heat was maintained and foamed until the gaps were completely filled to obtain a sound insulation board. Example 8

[0046] This embodiment provides a method for preparing a sound insulation board based on bionic honeycomb reinforcement, comprising the following steps: Step 1: Preparation of modified polysiloxane Weigh: 50.0g1,3,5,7-tetramethylcyclotetrasiloxane, 70.0gtrifluoropropylmethylcyclotrisiloxane and 300.0mLN,N-dimethylformamide are added to the reactor. After the temperature of the reactor is raised to 120°C, 3.0gsodium hydroxide is added to the reactor. After the reaction is kept warm for 5 hours, 20.0g1,1,3,3-tetramethyldisiloxane is added to the reactor. The reaction is kept warm for 3 hours. After the reaction is completed, the reaction liquid is transferred to a vacuum dryer at a temperature of 80°C and vacuum dried until no liquid is extracted to obtain modified polysiloxane.

[0047] Step 2: Prepare the sound insulation board The supporting material prepared in Example 2 was placed on a panel, and 100.0 g of modified polysiloxane, 20.0 g of modified hollow microspheres prepared in Example 5, and 2.0 g of trispentafluorophenylborane were filled into the honeycomb structure of the supporting material. Another panel was fixed with a mold so that the gap between it and the supporting material was 3 mm. The mold was transferred to an oven, the oven temperature was raised to 60°C, and the heat was maintained for foaming until the gaps were completely filled to obtain a sound insulation board. Embodiment 9

[0048] This embodiment provides a method for preparing a sound insulation board based on bionic honeycomb reinforcement, comprising the following steps: Step 1: Preparation of modified polysiloxane Weigh: 45.0g 1,3,5,7-tetramethylcyclotetrasiloxane, 64.0g trifluoropropylmethylcyclotrisiloxane and 300.0mL N,N-dimethylformamide are added to the reactor. After the temperature of the reactor is raised to 120°C, 2.0g sodium hydroxide is added to the reactor. After the reaction is kept warm for 5 hours, 15.0g 1,1,3,3-tetramethyldisiloxane is added to the reactor. The reaction is kept warm for 2 hours. After the reaction is completed, the reaction liquid is transferred to a vacuum dryer at a temperature of 80°C and vacuum dried until no liquid is extracted to obtain modified polysiloxane.

[0049] Step 2: Prepare the sound insulation board The supporting material prepared in Example 3 was placed on a panel, and 96.0 g of modified polysiloxane, 15.0 g of modified hollow microspheres prepared in Example 5, and 1.6 g of trispentafluorophenylborane were filled into the honeycomb structure of the supporting material. Another panel was fixed with a mold so that the gap between it and the supporting material was 2.5 mm. The mold was transferred to an oven, the oven temperature was raised to 70°C, and the heat was maintained and foamed until the gaps were completely filled to obtain a sound insulation board.

[0050] Comparative Example 1 The difference between this comparative example and Example 9 is that the foaming liquid is not used in the preparation process of the supporting material used.

[0051] Comparative Example 2 The difference between this comparative example and Example 9 is that step ② is omitted during the preparation of the modified hollow microspheres used in step 2.

[0052] The difference between this comparative example and Example 9 is that the use of modified hollow microspheres is omitted in step 2.

[0053] Performance testing: The thermal conductivity and combustion performance of the sound insulation boards prepared in Examples 7-9 and Comparative Examples 1-3 were measured with reference to the standard GB / T 34336-2017 "Nanoporous Aerogel Composite Insulation Products"; The water contact angles of the sound insulation panels prepared in Examples 7-9 and Comparative Examples 1-3 were measured with reference to the standard GB / T 30693-2014 “Measurement of the contact angle of plastic films with water”; The sound insulation performance of the sound insulation boards prepared in Examples 1-3 and Comparative Examples 1-3 was tested with reference to the standard FZ / T 64058-2016 “Reprocessed fiber felt for automotive sound insulation and heat insulation pads”; The adhesion strength of the support material and the sound insulation foam in the sound insulation panels prepared in Examples 7-9 and Comparative Examples 1-3 was measured with reference to the standard GB / T 30804-2014 "Determination of tensile strength perpendicular to the surface of thermal insulation products for construction". Specific data are shown in Table 1. Table 1 - Performance test data of each sample

[0054] Data Analysis: After comparing and analyzing the data in Table 1, it can be found that the thermal conductivity of the sound insulation board prepared by the present invention at 25°C is 0.011 W·(m·K) -1 , combustion grade is A1, water contact angle is 164°, sound absorption coefficients at 800Hz, 1250Hz, 2000Hz and 3150Hz are 0.15, 0.29, 0.59 and 0.84 respectively, and interlayer adhesion strength is 224kPa, all of which are better than the comparative example; After comparing and analyzing the data in Table 1, it can be found that the sound insulation board prepared in Comparative Examples 1-3 has significantly lower sound insulation and heat insulation performance than the sound insulation board prepared in Example 9, indicating that: In Comparative Example 1, the supporting material is not foamed, the internal structure is dense, and there is a lack of effective pore scattering and absorption channels. The sound wave and heat conduction paths are short and the reflection ability is weak, making it difficult to form a thermal acoustic barrier effect, resulting in a significant reduction in sound insulation and heat insulation efficiency. Comparative Example 2: The microspheres lacking siloxane modification cannot undergo cross-linking reaction with the silicon-hydrogen groups in the modified polysiloxane, and cannot produce hydrogen foaming in situ. The porosity inside the material is significantly reduced, resulting in a shortened thermal insulation conduction path and weakened sound wave scattering ability. The lack of a porous structure greatly weakens the thermal and acoustic barrier effect, resulting in poor sound insulation and heat insulation performance. In comparative example 3, the unmodified microspheres make the material lack an effective multi-scale pore structure, the sound wave and heat flow penetration paths become shorter, the absorption and scattering capabilities are weakened, and the multi-phase interface barrier effect cannot be provided, and the sound insulation and heat insulation effects are significantly reduced.

[0055] After comparing and analyzing the data in Table 1, it can be found that the flame retardant and hydrophobic properties of the sound insulation boards prepared in Comparative Examples 1-3 are significantly lower than those of the sound insulation board prepared in Example 9, indicating that: Comparative Example 1: The dense structure leads to a decrease in specific surface area, making it difficult for the hydrophobic and flame retardant components to be fully distributed and coordinated. At the same time, the lack of porous support is not conducive to the formation of an insulating carbon layer, the hydrophobic path is shortened, and the waterproof and fire resistance are significantly weakened. Comparative Example 2 has no siloxane modification, which results in the microsphere surface being unable to participate in the cross-linking reaction and unable to generate a bubble structure. The surface roughness of the material is insufficient, and the hydrophobicity is significantly weakened. At the same time, the silicon-oxygen network is imperfect, the carbon layer forming ability is reduced, and the flame retardancy is reduced. The lack of modified microspheres in comparative example 3 causes the surface of the material to lack rough structural support, the hydrophobic groups are unevenly distributed and it is difficult to form a lotus leaf-shaped microstructure, which reduces the hydrophobicity; at the same time, the flame retardant elements are distributed in a single manner and the carbonization efficiency is insufficient.

[0056] After comparing and analyzing the data in Table 1, it can be found that the interlayer adhesion of the sound insulation boards prepared in Comparative Examples 1-3 is significantly reduced compared with the sound insulation board prepared in Example 9, indicating that: The surface flatness of the support material structure of Comparative Example 1 is high, but the interface roughness is insufficient, resulting in a lack of mechanical interlocking and effective overlap between the functional layer and the support material. The bonding area is small, making it difficult to achieve a strong interface connection, and the overall resistance to interlayer separation is poor. Although Comparative Example 2 has hydroxyl groups, it lacks effective cross-linking points. The microspheres are difficult to embed and stably fix in the matrix, resulting in a weakened overall interfacial bonding force of the material, which is prone to peeling or crack propagation, and the structural stability is worse than that of the embodiment. In Comparative Example 3, there are no microspheres involved in cross-linking and structural interlocking. The material interface is single and lacks multi-point connection channels, so a strong interlayer support system cannot be constructed. The bonding strength is reduced, and the overall anti-peeling and deformation capabilities are significantly weakened.

[0057] Finally, it is shown that the foaming treatment of the supporting material not only provides a lightweight porous skeleton, but also creates conditions for the subsequent attachment of functional layers and the intercalation of microspheres; a cross-linking foaming reaction occurs between the modified microspheres and the matrix after surface modification, which not only enhances the interfacial bonding, but also constructs a microscopic rough structure, which helps to form hydrophobic and thermal insulation properties; modified polysiloxane further enhances the overall weather resistance, flame retardancy and sound and heat shielding capabilities of the material through the synergy of ingredients. The various processing steps and component designs are interdependent in the process of structure formation and function realization, and together construct the excellent comprehensive performance of the material.

[0058] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. Based on the bionic honeycomb enhanced sound insulation board, it is characterized by: The invention comprises two panels and a sound insulation layer located between the two panels, wherein the sound insulation layer is composed of a honeycomb supporting material and sound insulation foam; The sound insulation foam is obtained by mixing modified polysiloxane and modified hollow microspheres and foaming them in the honeycomb structure of the supporting material; The preparation method of the modified polysiloxane comprises the following steps: adding 1,3,5,7-tetramethylcyclotetrasiloxane, trifluoropropylmethylcyclotrisiloxane and N,N-dimethylformamide into a reaction kettle, raising the temperature of the reaction kettle to 100-120° C., adding sodium hydroxide into the reaction kettle, keeping the temperature for reaction for 4-5 hours, adding 1,1,3,3-tetramethyldisiloxane into the reaction kettle, keeping the temperature for reaction for 2-3 hours, and performing post-processing to obtain the modified polysiloxane.

2. The sound insulation board based on bionic honeycomb reinforcement according to claim 1 is characterized in that: In the process of preparing the supporting material, in the process of preparing the modified polysiloxane, the usage ratio of the 1,3,5,7-tetramethylcyclotetrasiloxane, trifluoropropylmethylcyclotrisiloxane, N,N-dimethylformamide, sodium hydroxide and 1,1,3,3-tetramethyldisiloxane is 4-5g:6-7g:20-30mL:0.1-0.3g:1-2g.

3. The sound insulation board based on bionic honeycomb reinforcement according to claim 1 is characterized in that: The method for preparing the support material comprises the following steps: A1. Add hydroxyl-terminated methyl vinyl silicone oil, dichloro(dicyclopentadiene)platinum, and tetrahydrofuran to a reactor. After nitrogen is introduced into the reactor, the temperature is raised to 40-60° C., and trimethoxysilane is added to the reactor. The reaction is kept at this temperature for 60-80 minutes, and post-processed to obtain modified siloxane. A2. Add modified siloxane, stannous octoate, N,N-dimethylformamide and a catalyst to a reactor. After nitrogen protection, raise the temperature of the reactor to 40-60° C. and add a calculated amount of dimethylbiphenyl diisocyanate to the reactor. After keeping the temperature for 2-4 hours, post-process and obtain a gel material. A3. Fill the gel material into a honeycomb mold preheated to 30-40°C, add foaming liquid into the mold, keep it warm and foam for 1-2 minutes, and then post-process it to obtain the support material.

4. The sound insulation board based on bionic honeycomb reinforcement according to claim 3 is characterized in that: In step A1, the amount ratio of the hydroxyl-terminated methyl vinyl silicone oil, dichloro(dicyclopentadiene)platinum, tetrahydrofuran and trimethoxysilane is 8-10g:0.2-0.3g:40-50mL:1-2g; in step A2, the amount ratio of the modified siloxane, stannous octoate, N,N-dimethylformamide and catalyst is 10-12g:0.1g:40-50mL:0.3g, wherein the catalyst The agent is dibutyltin dilaurate, and the amount of dimethylbiphenyl diisocyanate is 0.55-0.60 times the molar amount of hydroxyl groups in the modified siloxane; in step A3, the amount ratio of the gel material to the foaming liquid is 8-10g:10-12mL, wherein the foaming liquid is obtained by mixing deionized water and triethylenediamine at a ratio of 10mL:1-2g, and the thickness of the honeycomb template is 20-30mm and the side length is 2-3m.

5. The sound insulation board based on bionic honeycomb reinforcement according to claim 1 is characterized in that: The preparation method of the modified hollow microspheres comprises the following steps: B1. Add the hollow microspheres and 3-5 wt% sodium hydroxide aqueous solution into a reactor and stir. Raise the temperature of the reactor to 60-80° C. and keep the temperature for 1-2 hours. Post-treat to obtain activated hollow microspheres. B2. Add activated hollow microspheres, anhydrous ethanol and dibutyltin dilaurate into a reactor. After nitrogen protection, increase the temperature of the reactor to 40-60°C and add 3-isocyanatepropyltrimethoxysilane into the reactor. After keeping the temperature for 40-60 minutes, post-treat to obtain modified hollow microspheres.

6. The sound insulation board based on bionic honeycomb reinforcement according to claim 5, characterized in that: In step B1, the amount ratio of the hollow microspheres and 3-5wt% sodium hydroxide aqueous solution is 1-2g:10-12mL; in step B2, the amount ratio of the modified siloxane, anhydrous ethanol, dibutyltin dilaurate and 3-isocyanatepropyltrimethoxysilane is 1-2g:20-30mL:0.2g:0.5-0.8g.

7. The method for preparing a sound insulation board based on bionic honeycomb reinforcement according to any one of claims 1 to 6, characterized in that: The supporting material is placed on a panel, and modified polysiloxane, modified hollow microspheres and tris(pentafluorophenyl)borane are filled into the honeycomb structure of the supporting material. Another panel is fixed with a mold so that the gap between it and the supporting material is 2-3 mm. The mold is transferred to an oven, and the oven temperature is increased to 60-80°C. The panel is kept warm and foamed until the gap is completely filled to obtain a sound insulation board.

8. The method for preparing a sound insulation board based on bionic honeycomb reinforcement according to claim 7, characterized in that: In the process of preparing the sound insulation layer, the usage ratio of the modified polysiloxane, the modified hollow microspheres and trispentafluorophenylborane is 8-10g:1-2g:0.1-0.2g.

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