High sound-absorbing and flame-retardant porous structure composite sound-absorbing cotton and preparation method thereof
By constructing a stress-responsive sliding network structure and a multi-level porous structure, the problems of insufficient low-frequency sound absorption and flame-retardant performance dependent on high filling volume in sound-absorbing cotton were solved, thus achieving a comprehensive performance improvement of high sound absorption and flame-retardant porous composite sound-absorbing cotton.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 河北澳瑞环保科技有限公司
- Filing Date
- 2026-04-24
- Publication Date
- 2026-06-19
Smart Images
Figure CN122234573A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of polymer functional materials and acoustic absorption materials, specifically relating to a high sound absorption and flame retardant porous composite sound-absorbing cotton and its preparation method. Background Technology
[0002] With the development of rail transit, automotive industry, building sound insulation, and noise reduction in home appliances, the performance requirements for sound-absorbing materials are constantly increasing, especially in terms of mid-to-low frequency sound absorption capacity, flame retardancy, and long-term stability. Sound-absorbing cotton, as a typical porous sound-absorbing material, usually uses polyester fiber, polypropylene fiber, or polyurethane foam as a matrix, achieving sound wave energy absorption and attenuation through the construction of a porous structure.
[0003] However, existing sound-absorbing cotton still has many shortcomings: on the one hand, most materials rely on a single pore structure for sound absorption, mainly achieving sound energy attenuation through air viscosity damping and heat conduction loss, which has limited absorption effect on mid- and low-frequency sound waves and is difficult to meet the demand for wide-band high-efficiency sound absorption; on the other hand, flame retardant performance is usually achieved by adding aluminum hydroxide, magnesium hydroxide or phosphorus-nitrogen flame retardants, but such methods often require a high filling amount, which can easily lead to increased material density, decreased flexibility and poor resilience.
[0004] Furthermore, existing modification methods are mostly simple physical fillings or surface chemical modifications, lacking multi-scale control over the internal structure of the material, especially functionalized network structures that can undergo structural response or energy dissipation under the action of sound waves, thus limiting the improvement of sound absorption performance. At the same time, the material is prone to pore structure collapse or interface debonding under long-term vibration or thermal environment, thereby affecting its service life.
[0005] Therefore, developing a high-performance composite sound-absorbing cotton that maintains a lightweight porous structure, achieves multiple energy dissipation mechanisms through structural design, and possesses excellent flame retardant properties and mechanical stability is of significant research importance and application value. Summary of the Invention
[0006] To overcome the problems in the aforementioned technologies, such as insufficient mid-to-low frequency sound absorption due to the single porous structure, the reliance on high filler content in flame-retardant systems affecting material mechanical properties, and poor structural stability, the present invention aims to provide a high-absorption, flame-retardant porous composite sound-absorbing cotton and its preparation method. This invention introduces a stress-responsive slip network structure constructed from bis(2-nitrobenzyl)oxalate and 2-ureido-4-pyridone in the presence of polyethylene glycol diacrylate and triethanolamine. This is combined with a 9,9-bis(4-hydroxyphenyl)fluorene organic small-molecule functional regulator and a phytic acid-melamine-magnesium hydroxide flame-retardant system, along with foaming control components to construct a hierarchical porous structure, thereby forming a porous composite system with dynamic energy dissipation capabilities. This invention achieves a synergistic improvement in broadband, high-efficiency sound absorption and excellent flame-retardant performance while maintaining the material's lightweight porous structure.
[0007] The objective of this invention can be achieved through the following technical solutions:
[0008] A high sound-absorbing and flame-retardant porous composite sound-absorbing cotton comprises the following raw materials in parts by weight: 80-150 parts of polyethylene terephthalate fiber; 20-80 parts of synergistically modified stress-responsive slip network structure; 2-20 parts of 9,9-bis-4-hydroxyphenylfluorene; 10-30 parts of phytic acid; 5-20 parts of melamine; 10-30 parts of magnesium hydroxide; 2-10 parts of azodicarbonamide; 1-5 parts of benzoyl peroxide; 1-8 parts of fatty alcohol polyoxyethylene ether; and 50-200 parts of deionized water. The synergistically modified stress-responsive slip network structure is formed by the synergistic modification of bis-2-nitrobenzyl oxalate and 2-ureido-4-pyridone under the action of polyethylene glycol diacrylate and triethanolamine through stress-responsive reversible fracture recombination and multiple hydrogen bond slip crosslinking.
[0009] Optionally, the synergistically modified stress-responsive slip network structure comprises the following raw materials in parts by weight: 10-40 parts of bis(2-nitrobenzyl oxalate); 5-25 parts of polyethylene glycol diacrylate; 5-20 parts of 2-ureido-4-pyridone; 2-15 parts of triethanolamine; and 1-10 parts of diethyl carbonate.
[0010] Optionally, the method for preparing synergistically modified stress-responsive slip network structures includes the following steps:
[0011] (1) Bis(2-nitrobenzyl) oxalate and polyethylene glycol diacrylate were mixed to obtain a premixed system;
[0012] (2) Add 2-ureido-4-pyridone compounds and triethanolamine to the premixed system and react to obtain a supramolecular slip network system;
[0013] (3) The supramolecular slip network system is subjected to structural stabilization treatment to obtain a synergistically modified stress-responsive slip network structure.
[0014] Optionally, the reaction conditions in step (1) are stirring at 25-40°C, with a stirring speed of 300-800 rpm and a time of 0.5-2 h.
[0015] Optionally, the reaction conditions in step (2) are: reaction at 40–80°C for 1–4 hours.
[0016] Optionally, the reaction conditions in step (3) are to keep warm at 60-100°C for 1-3 hours and to carry out the reaction under an inert atmosphere.
[0017] Optionally, a method for preparing a high sound-absorbing and flame-retardant porous composite sound-absorbing cotton includes the following steps:
[0018] S1, polyethylene terephthalate fiber, synergistically modified stress-responsive slip network structure, 9,9-bis4-hydroxyphenylfluorene, phytic acid, melamine and magnesium hydroxide are added to deionized water and mixed and dispersed to obtain a homogeneous slurry system;
[0019] S2, add azodicarbonamide, benzoyl peroxide and fatty alcohol polyoxyethylene ether to the homogeneous slurry system, stir and disperse to obtain the foaming precursor system;
[0020] S3, the foaming precursor system is foamed and shaped to obtain a high sound-absorbing and flame-retardant porous composite sound-absorbing cotton.
[0021] Optionally, the reaction conditions for step S1 are dispersion at 20–50°C, stirring speed of 500–1500 rpm, and time of 0.5–2 h.
[0022] Optionally, the reaction conditions for step S2 are: stirring and dispersing at 30–70°C, stirring speed of 800–2000 rpm, and time of 0.5–1.5 h.
[0023] Optionally, the reaction conditions for step S3 are as follows: foaming treatment at 120–180°C for 5–30 min, followed by setting treatment at 80–140°C for 10–60 min.
[0024] The beneficial effects of this invention are:
[0025] This invention constructs a stress-responsive slip network structure synergistically formed by bis(2-nitrobenzyl)oxalate and 2-ureido-4-pyridone. Under the action of sound waves, this structure undergoes reversible fracture and multiple hydrogen bond recombination, realizing the conversion of sound energy into chemical bond rearrangement energy, thereby significantly improving the dissipation capacity of mid- and low-frequency sound waves. Simultaneously, 9,9-bis(4-hydroxyphenyl)fluorene introduces a high-rigidity aromatic structure, which not only enhances the stability of the material skeleton but also promotes the formation of a dense carbon layer during combustion, improving flame retardant performance. Phytic acid-melamine-magnesium hydroxide synergistically constructs a dual protection system of intumescent flame retardancy and inorganic thermal insulation, forming an interfacial synergistic effect with the slip network structure, maintaining the flexibility and resilience of the material while reducing the amount of flame retardant added. Furthermore, by controlling the foaming components to form a multi-level pore structure, the sound wave propagation path is extended and the interfacial reflection and scattering effects are enhanced, enabling the material to exhibit excellent sound absorption performance over a wide frequency range. Overall, the sound absorption performance, flame retardant performance, and structural stability are synergistically improved, demonstrating significant structural innovation and unexpected technical effects. Attached Figure Description
[0026] The invention will now be further described with reference to the accompanying drawings.
[0027] Figure 1 The infrared spectra of bis(2-nitrobenzyl)oxalate and the synergistically modified stress-responsive slip network structure are compared. Detailed Implementation
[0028] The present invention will be further described below with reference to specific embodiments. However, the present invention is not limited to the following embodiments. Equivalent adjustments made without departing from the spirit and essence of the present invention should also be considered to fall within the protection scope of the present invention.
[0029] Example 1: The purpose of this example is to verify the basic formability and sound absorption and flame retardant properties of the material when the components and process parameters are taken at their lower limits.
[0030] S1, 10 parts of bis(2-nitrobenzyl)oxalate and 5 parts of polyethylene glycol diacrylate were mixed, and 1 part of diethyl carbonate was added. The mixture was stirred at 25°C and 300 rpm for 0.5 h to obtain a premixed system. Then, 5 parts of 2-ureido-4-pyridone and 2 parts of triethanolamine were added, and the mixture was reacted at 40°C for 1 h to form a supramolecular slip network system. The mixture was then kept at 60°C for 1 h and subjected to structural stabilization treatment under nitrogen protection to obtain a synergistically modified stress-responsive slip network structure.
[0031] S2, 80 parts of polyethylene terephthalate fiber, 20 parts of the above-mentioned synergistically modified stress-responsive slip network structure, 2 parts of 9,9-bis-4-hydroxyphenylfluorene, 10 parts of phytic acid, 5 parts of melamine, and 10 parts of magnesium hydroxide were added to 50 parts of deionized water and dispersed by stirring at 20°C and 500 rpm for 0.5 h to obtain a homogeneous slurry system; then 2 parts of azodicarbonamide, 1 part of benzoyl peroxide, and 1 part of fatty alcohol polyoxyethylene ether were added and stirred at 30°C and 800 rpm for 0.5 h to obtain a foaming precursor system;
[0032] S3, the foaming precursor system is foamed at 120℃ for 5 minutes, and then shaped at 80℃ for 10 minutes to obtain high sound absorption and flame retardant porous composite sound-absorbing cotton.
[0033] Example 2: The purpose of this example is to verify the comprehensive improvement effect of the synergistic effect of each component on sound absorption performance, flame retardant performance and structural stability under the preferred median conditions.
[0034] S1, 25 parts of bis(2-nitrobenzyl)oxalate and 15 parts of polyethylene glycol diacrylate were mixed, and 5 parts of diethyl carbonate were added. The mixture was stirred at 30°C and 600 rpm for 1 h to obtain a premixed system. Then, 12 parts of 2-ureido-4-pyridone and 8 parts of triethanolamine were added, and the mixture was reacted at 60°C for 2.5 h to form a supramolecular slip network system. The mixture was then kept at 80°C for 2 h and subjected to structural stabilization treatment under nitrogen protection to obtain a synergistically modified stress-responsive slip network structure. Figure 1 Infrared spectral comparison shows that the modified sample has a wavelength of 3300 cm⁻¹. -1 The presence of a significantly enhanced absorption peak nearby indicates that the introduction of 2-ureido-4-pyridone resulted in significant hydrogen bonding; simultaneously, at 1660–1700 cm⁻¹... -1 The appearance of a new strong absorption peak within the range corresponds to the C=O vibration of the urea group, indicating the successful construction of a hydrogen bond slip network structure; compared to the unmodified structure, the peak at 1735 cm⁻¹... -1 The C=O peak of the ester group shows a certain degree of weakening and shift, indicating its participation in intermolecular interactions; in the 1200–1000 cm⁻¹ range... -1 The significant enhancement of the COC absorption peak in the region indicates that polyethylene glycol diacrylate participated in the formation of the cross-linked structure; the overall enhancement of the aromatic ring-related peaks indicates that the rigidity of the system has been improved; this demonstrates that the synergistic modification successfully constructed a stress-response and slip network structure.
[0035] S2, 120 parts of polyethylene terephthalate fiber, 50 parts of the above-mentioned synergistically modified stress-responsive slip network structure, 10 parts of 9,9-bis-4-hydroxyphenylfluorene, 20 parts of phytic acid, 12 parts of melamine and 20 parts of magnesium hydroxide were added to 120 parts of deionized water and dispersed by stirring at 35°C and 1000 rpm for 1 hour to obtain a homogeneous slurry system; then 6 parts of azodicarbonamide, 3 parts of benzoyl peroxide and 4 parts of fatty alcohol polyoxyethylene ether were added and stirred at 50°C and 1200 rpm for 1 hour to obtain a foaming precursor system;
[0036] S3, the foaming precursor system is foamed at 150℃ for 20 minutes, and then shaped at 110℃ for 30 minutes to obtain high sound absorption and flame retardant porous composite sound-absorbing cotton.
[0037] Example 3: The purpose of this example is to verify the material's structural stability and high flame retardant performance when all components and process parameters are at their upper limits.
[0038] S1, 40 parts of bis(2-nitrobenzyl)oxalate and 25 parts of polyethylene glycol diacrylate were mixed, and 10 parts of diethyl carbonate were added. The mixture was stirred at 40℃ and 800 rpm for 2 h to obtain a premixed system. Then, 20 parts of 2-ureido-4-pyridone and 15 parts of triethanolamine were added, and the mixture was reacted at 80℃ for 4 h to form a supramolecular slip network system. The mixture was then kept at 100℃ for 3 h and subjected to structural stabilization treatment under nitrogen protection to obtain a synergistically modified stress-responsive slip network structure.
[0039] S2, 150 parts of polyethylene terephthalate fiber, 80 parts of the above-mentioned synergistically modified stress-responsive slip network structure, 20 parts of 9,9-bis-4-hydroxyphenylfluorene, 30 parts of phytic acid, 20 parts of melamine and 30 parts of magnesium hydroxide were added to 200 parts of deionized water and dispersed by stirring at 50°C and 1500 rpm for 2 hours to obtain a homogeneous slurry system; then 10 parts of azodicarbonamide, 5 parts of benzoyl peroxide and 8 parts of fatty alcohol polyoxyethylene ether were added and stirred at 70°C and 2000 rpm for 1.5 hours to obtain a foaming precursor system;
[0040] S3, the foaming precursor system is foamed at 180℃ for 30 minutes, and then shaped at 140℃ for 60 minutes to obtain high sound absorption and flame retardant porous composite sound-absorbing cotton.
[0041] Comparative Example 1: The purpose of this comparative example is to verify the effect of using only stress-responsive structures without introducing slip hydrogen bond networks on the overall properties of the material.
[0042] S1, 25 parts of bis(2-nitrobenzyl)oxalate and 15 parts of polyethylene glycol diacrylate were mixed, and 5 parts of diethyl carbonate were added. The mixture was stirred at 30°C and 600 rpm for 1 h to obtain a premixed system. Then, 8 parts of triethanolamine were added and reacted at 60°C for 2.5 h to form a stress-responsive network system. The system was then kept at 80°C for 2 h and subjected to structural stabilization treatment under nitrogen protection to obtain a single stress-responsive modified structure.
[0043] S2, 120 parts of polyethylene terephthalate fiber, 50 parts of the above-mentioned single stress-responsive modified structure, 10 parts of 9,9-bis4-hydroxyphenylfluorene, 20 parts of phytic acid, 12 parts of melamine and 20 parts of magnesium hydroxide were added to 120 parts of deionized water and dispersed by stirring at 35°C and 1000 rpm for 1 hour to obtain a homogeneous slurry system; then 6 parts of azodicarbonamide, 3 parts of benzoyl peroxide and 4 parts of fatty alcohol polyoxyethylene ether were added and stirred at 50°C and 1200 rpm for 1 hour to obtain a foaming precursor system;
[0044] S3, the foaming precursor system is foamed at 150℃ for 20 minutes, and then shaped at 110℃ for 30 minutes to obtain composite sound-absorbing cotton.
[0045] Comparative Example 2: The purpose of this comparative example is to verify the effect of using only a multiple hydrogen bond slip network without introducing a stress-response structure on the sound absorption and energy dissipation capacity of the material.
[0046] S1, 15 parts of polyethylene glycol diacrylate and 5 parts of diethyl carbonate were mixed and stirred at 30°C and 600 rpm for 1 h to obtain a premixed system; then 12 parts of 2-ureido-4-pyridone and 8 parts of triethanolamine were added and reacted at 60°C for 2.5 h to form a supramolecular slip network system; then the system was kept at 80°C for 2 h and subjected to structural stabilization treatment under nitrogen protection to obtain a single slip network structure;
[0047] S2, 120 parts of polyethylene terephthalate fiber, 50 parts of the above-mentioned single slip network structure, 10 parts of 9,9-bis4-hydroxyphenylfluorene, 20 parts of phytic acid, 12 parts of melamine and 20 parts of magnesium hydroxide were added to 120 parts of deionized water and dispersed by stirring at 35°C and 1000 rpm for 1 hour to obtain a homogeneous slurry system; then 6 parts of azodicarbonamide, 3 parts of benzoyl peroxide and 4 parts of fatty alcohol polyoxyethylene ether were added and stirred at 50°C and 1200 rpm for 1 hour to obtain a foaming precursor system;
[0048] S3, the foaming precursor system is foamed at 150℃ for 20 minutes, and then shaped at 110℃ for 30 minutes to obtain composite sound-absorbing cotton.
[0049] Comparative Example 3: The purpose of this comparative example is to verify the contribution of the small organic molecule 9,9-bis(4-hydroxyphenyl)fluorene to the structural stability and flame retardant properties of the material.
[0050] S1, 25 parts of bis(2-nitrobenzyl)oxalate and 15 parts of polyethylene glycol diacrylate were mixed, and 5 parts of diethyl carbonate were added. The mixture was stirred at 30°C and 600 rpm for 1 h to obtain a premixed system. Then, 12 parts of 2-ureido-4-pyridone and 8 parts of triethanolamine were added, and the mixture was reacted at 60°C for 2.5 h to form a supramolecular slip network system. The mixture was then kept at 80°C for 2 h and subjected to structural stabilization treatment under nitrogen protection to obtain a synergistically modified stress-responsive slip network structure.
[0051] S2, 120 parts of polyethylene terephthalate fiber, 50 parts of the above-mentioned synergistically modified stress-responsive slip network structure, 20 parts of phytic acid, 12 parts of melamine, and 20 parts of magnesium hydroxide were added to 120 parts of deionized water and dispersed by stirring at 35°C and 1000 rpm for 1 hour to obtain a homogeneous slurry system; then 6 parts of azodicarbonamide, 3 parts of benzoyl peroxide, and 4 parts of fatty alcohol polyoxyethylene ether were added and stirred at 50°C and 1200 rpm for 1 hour to obtain a foaming precursor system;
[0052] S3, the foaming precursor system is foamed at 150℃ for 20 minutes, and then shaped at 110℃ for 30 minutes to obtain composite sound-absorbing cotton.
[0053] Performance testing:
[0054] 1. Sound absorption performance test
[0055] The sound absorption performance of the material was tested using the standing wave tube method. The prepared composite sound-absorbing cotton was cut into cylindrical samples with a diameter of 100 mm and a thickness of 20 mm. The sample surface was flat and without obvious defects. The samples were installed in the standing wave tube testing device, and the test frequency range was 125 to 4000 Hz. The sound absorption coefficients were recorded at typical frequency points such as 125 Hz, 250 Hz, 500 Hz, 1000 Hz and 2000 Hz. Each sample was tested three times and the average value was taken. The average sound absorption coefficient was calculated to evaluate the material's ability to absorb mid-low frequency and broadband sound waves.
[0056] 2. Flame retardant performance test
[0057] The flame retardant properties of the material were evaluated using the limiting oxygen index (LOI) test method. Samples were cut into strips 100 mm long, 10 mm wide, and 10 mm thick. The samples were tested in an oxygen index meter by introducing a mixture of oxygen and nitrogen and gradually adjusting the oxygen volume fraction. The lowest oxygen volume fraction at which the sample could sustain combustion for 3 minutes or reach a burning length of 50 mm after ignition was taken as the limiting oxygen index value. Each sample was tested three times, and the average value was taken to evaluate the flame retardant ability of the material.
[0058] 3. Heat release performance test
[0059] The combustion heat release behavior of the material was tested using a cone calorimeter. The sample was cut into 100mm×100mm×20mm sizes and placed under a radiant heat flux of 35kW / m² for testing. The heat release rate, peak heat release rate and total heat release of the material during the combustion process were recorded. By comparing the relevant values of different samples, the heat release intensity and fire hazard of the material during combustion were evaluated.
[0060] 4. Rebound performance test
[0061] The elastic recovery ability of the material was evaluated by the compression recovery performance test method. The sample was cut into blocks of 50mm×50mm×20mm and compressed to half of the original thickness in a compression testing machine at a speed of 10mm / min. After being compressed for 5 minutes, the block was unloaded and placed at room temperature for 10 minutes. The recovered thickness was then measured, and the recovery performance was calculated based on the degree of recovery. Each group of samples was tested 3 times and the average value was taken to evaluate the structural stability and deformation resistance of the material.
[0062] Table 1 Performance Test Results
[0063] sample Average sound absorption coefficient Limiting oxygen index % Peak heat release rate kW / m² Rebound rate % Example 1 0.62 29 165 84 Example 2 0.78 34 110 93 Example 3 0.70 31 140 88 Comparative Example 1 0.48 27 190 78 Comparative Example 2 0.52 26 200 75 Comparative Example 3 0.55 24 215 80
[0064] As shown in Table 1, there are significant differences between the examples and the comparative examples in terms of sound absorption performance, flame retardant performance and structural stability. Among them, Example 2 shows the best performance in all indicators, indicating that its overall performance is the best.
[0065] In terms of sound absorption performance, the average sound absorption coefficients of Examples 1 to 3 were 0.62, 0.78, and 0.70, respectively, all significantly higher than the comparative examples' 0.48, 0.52, and 0.55, indicating stronger sound energy dissipation capabilities in the 125–4000 Hz range. This is mainly attributed to the reversible structural changes that the synergistically modified stress-responsive slip network structure undergoes under the action of sound waves, thereby enhancing the sound wave propagation path and energy dissipation efficiency.
[0066] In terms of flame retardant performance, the limiting oxygen indices of the examples were 29%, 34%, and 31%, respectively, all higher than those of the comparative examples (27%, 26%, and 24%). Example 2 reached 34%, demonstrating superior flame retardant ability. This indicates that the flame retardant system constructed from phytic acid, melamine, and magnesium hydroxide can form a more stable and dense flame retardant structure under the synergistic modification of the network and the action of small organic molecules.
[0067] In terms of heat release performance, the peak heat release rates of the embodiments were 165kW / m², 110kW / m² and 140kW / m², respectively, which were significantly lower than those of the comparative examples of 190kW / m², 200kW / m² and 215kW / m². Among them, Embodiment 2 had the lowest rate of 110kW / m², indicating that heat release during combustion was effectively suppressed and the fire hazard was significantly reduced.
[0068] In terms of resilience, the resilience rates of the embodiments were 84%, 93% and 88%, respectively, which were all higher than those of the comparative examples of 78%, 75% and 80%. Among them, the resilience rate of embodiment 2 reached 93%, indicating that the material has better deformation recovery ability after being compressed, which is closely related to the reversible deformation ability provided by the slip network structure.
[0069] In summary, this invention achieves a comprehensive improvement in sound absorption, flame retardancy, and mechanical properties by constructing a structural system with synergistic effects of stress response and slip network, and by combining the synergistic regulation of organic small molecules and flame-retardant components, demonstrating significant structural innovation and excellent comprehensive performance.
Claims
1. A high sound-absorbing and flame-retardant porous composite sound-absorbing cotton, characterized in that, The composite sound-absorbing cotton comprises the following raw materials in parts by weight: 80-150 parts of polyethylene terephthalate fiber; 20-80 parts of synergistically modified stress-responsive slip network structure; 2-20 parts of 9,9-bis-4-hydroxyphenylfluorene; 10-30 parts of phytic acid; 5-20 parts of melamine; 10-30 parts of magnesium hydroxide; 2-10 parts of azodicarbonamide; 1-5 parts of benzoyl peroxide; 1-8 parts of fatty alcohol polyoxyethylene ether; and 50-200 parts of deionized water. The synergistically modified stress-responsive slip network structure is formed by the synergistic modification of bis-2-nitrobenzyl oxalate and 2-ureido-4-pyridone under the action of polyethylene glycol diacrylate and triethanolamine through stress-responsive reversible fracture recombination and multiple hydrogen bond slip crosslinking.
2. The high sound-absorbing and flame-retardant porous composite sound-absorbing cotton according to claim 1, characterized in that, The synergistically modified stress-responsive slip network structure comprises the following raw materials in parts by weight: 10-40 parts of bis(2-nitrobenzyl oxalate); 5-25 parts of polyethylene glycol diacrylate; 5-20 parts of 2-ureido-4-pyridone; 2-15 parts of triethanolamine; and 1-10 parts of diethyl carbonate.
3. The high sound-absorbing, flame-retardant porous composite sound-absorbing cotton according to claim 1 or 2, characterized in that, The method for preparing the synergistically modified stress-responsive slip network structure includes the following steps: (1) Bis(2-nitrobenzyl) oxalate and polyethylene glycol diacrylate were mixed to obtain a premixed system; (2) Add 2-ureido-4-pyridone compounds and triethanolamine to the premixed system and react to obtain a supramolecular slip network system; (3) The supramolecular slip network system is subjected to structural stabilization treatment to obtain a synergistically modified stress-responsive slip network structure.
4. The high sound absorption and flame retardant porous composite sound-absorbing cotton according to claim 3, characterized in that, The reaction conditions for step (1) are stirring at 25-40°C, stirring speed of 300-800 rpm, and time of 0.5-2 h.
5. The high sound-absorbing, flame-retardant porous composite sound-absorbing cotton according to claim 3, characterized in that, The reaction conditions for step (2) are 40-80°C and 1-4 hours.
6. The high sound-absorbing, flame-retardant porous composite sound-absorbing cotton according to claim 3, characterized in that, The reaction conditions for step (3) are to keep warm at 60-100°C for 1-3 hours and to be carried out under an inert atmosphere.
7. A method for preparing a high sound-absorbing and flame-retardant porous composite sound-absorbing cotton, characterized in that, The preparation method includes the following steps: S1, polyethylene terephthalate fiber, synergistically modified stress-responsive slip network structure, 9,9-bis4-hydroxyphenylfluorene, phytic acid, melamine and magnesium hydroxide are added to deionized water and mixed and dispersed to obtain a homogeneous slurry system; S2, add azodicarbonamide, benzoyl peroxide and fatty alcohol polyoxyethylene ether to the homogeneous slurry system, stir and disperse to obtain the foaming precursor system; S3, the foaming precursor system is foamed and shaped to obtain a high sound-absorbing and flame-retardant porous composite sound-absorbing cotton.
8. The preparation method of a high sound-absorbing and flame-retardant porous composite sound-absorbing cotton according to claim 7, characterized in that, The reaction conditions for step S1 are dispersion at 20–50°C, stirring speed of 500–1500 rpm, and time of 0.5–2 h.
9. The preparation method of a high sound-absorbing and flame-retardant porous composite sound-absorbing cotton according to claim 7, characterized in that, The reaction conditions for step S2 are: stirring and dispersing at 30–70°C, stirring speed of 800–2000 rpm, and time of 0.5–1.5 h.
10. The method for preparing a high sound-absorbing, flame-retardant porous composite sound-absorbing cotton according to claim 7, characterized in that, The reaction conditions for step S3 are as follows: foaming treatment at 120-180°C for 5-30 minutes, followed by setting treatment at 80-140°C for 10-60 minutes.