A biodegradable polyurethane sound-absorbing foam composite

Abstract

The application discloses a biodegradable polyurethane sound-absorbing foam composite material, and relates to the technical field of polymer materials.The composite material comprises the following components in mass fractions: 100-120 parts of carbon dioxide-based polyester polyol; 30-50 parts of bio-based polyether polyol; 90-120 parts of polyisocyanate; 10-20 parts of sound-absorbing modified filler; 7.5-12.5 parts of foaming agent; 0.3-0.9 parts of catalyst; 0.8-1.5 parts of foam uniformizing agent; 1.5-3.0 parts of crosslinking agent; 8-15 parts of flame retardant; 0.5-1.5 parts of stabilizer; and 0.5-2.0 parts of antibacterial agent.The bio-based polyether polyol, the sound-absorbing modified filler, the foaming agent, the catalyst, the foam uniformizing agent, the crosslinking agent, the flame retardant, the stabilizer and the antibacterial agent are added to form a bio-based polyol system with the carbon dioxide-based polyester polyol, so that the low-carbon environmental protection and the basic performance of the material are considered, the various additives are synergistically enhanced, and the foam composite material is integrated with multiple functions such as biodegradation, sound absorption, flame retardation, antibiosis and stability.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and more specifically, to a biodegradable polyurethane sound-absorbing foam composite material. Background Technology

[0002] Polyurethane sound-absorbing foam is a type of polymer material that combines a porous structure with sound absorption, noise reduction, and cushioning functions. It is widely used in building sound insulation, rail transportation, automotive interiors, and industrial equipment noise reduction. With the advancement of environmental protection concepts and low-carbon policies, biodegradable polyurethane sound-absorbing foam composite materials have emerged. These materials use carbon dioxide-based polyols and bio-based polyols as main raw materials, combined with environmentally friendly additives, and possess sound absorption, cushioning, lightweight, and biodegradable properties. They are classified as green polymer functional materials with broad application prospects.

[0003] With increasing environmental awareness and the pursuit of sustainable development, the environmental problems caused by traditional non-degradable materials have gradually attracted attention. Sound-absorbing foam is widely used as an important sound insulation material in fields such as building materials, automotive interiors, and packaging. However, its main components are mostly difficult-to-degrade synthetic polymers, placing a heavy burden on the environment.

[0004] Existing biodegradable polyurethane sound-absorbing foam composite materials can achieve a certain degree of biodegradation by introducing bio-based components and possess basic sound absorption properties. However, they suffer from low biodegradation rates, low sound absorption coefficients, uneven cell structure, poor mechanical resilience, weak flame retardancy and antibacterial properties, insufficient thermal stability, and high levels of free isocyanate residue. As a result, they cannot simultaneously meet the comprehensive requirements of high degradability, high sound absorption, high strength, safety, and environmental protection, thus limiting their widespread application in high-end, long-life, and high-safety-level scenarios.

[0005] No effective solutions have yet been proposed to address the problems in the relevant technologies. Summary of the Invention

[0006] To address the problems in related technologies, this invention proposes a biodegradable polyurethane sound-absorbing foam composite material to overcome the aforementioned technical problems existing in the prior art.

[0007] Therefore, the specific technical solution adopted by the present invention is as follows: This invention provides a biodegradable polyurethane sound-absorbing foam composite material, which comprises the following components in parts by weight: 100-120 parts of carbon dioxide-based polyester polyol; 30-50 parts of bio-based polyether polyol; 90-120 parts of polyisocyanate; 10-20 parts of sound-absorbing modified filler; 7.5-12.5 parts of foaming agent; Catalyst 0.3-0.9 parts; Foaming agent 0.8-1.5 parts; Crosslinking agent 1.5-3.0 parts; 8-15 parts flame retardant; Stabilizer 0.5-1.5 parts; Antibacterial agent 0.5-2.0 parts.

[0008] Optionally, the polyisocyanate includes at least one of polymerized diphenylmethane diisocyanate, liquefied diphenylmethane diisocyanate, or carbodiimide-modified diphenylmethane diisocyanate; The isocyanate group content of the polyisocyanate is 30-32 wt%.

[0009] Optionally, the sound-absorbing modified filler includes at least two of the following: diatomaceous earth, zeolite powder, activated carbon, bamboo charcoal powder, expanded perlite, hollow glass microspheres, or plant fiber powder. Among them, plant fiber powder includes bamboo powder, hemp fiber and coconut shell fiber.

[0010] Optionally, the foaming agent includes chemical foaming agents and physical foaming agents; The chemical foaming agent is deionized water; Physical blowing agents include at least one of cyclopentane, HFC-245fa, or liquid carbon dioxide; The amount of deionized water added is 1.5-2.5 parts, and the amount of physical foaming agent added is 6-10 parts.

[0011] Optionally, the catalyst includes a foaming catalyst and a gel catalyst; The foaming catalyst includes at least one of pentamethyldiethylenetriamine or bis(dimethylaminoethyl) ether; The gel catalyst includes at least one of stannous octoate or bismuth neodecanoate.

[0012] Optionally, the foam stabilizer includes at least one of polyether-modified polydimethylsiloxane or a biodegradable organosilicon-polyether copolymer; The cloud point of the foam stabilizer is 30-50℃, and its viscosity at 25℃ is [missing value]. The dosage is 1.0-1.5 parts.

[0013] Optionally, the crosslinking agent includes at least one of epoxidized cashew phenol, gallic acid, amino-terminated hyperbranched polyester, or cyclic trimethylolpropane formal.

[0014] Optionally, the flame retardant includes at least one of ammonium polyphosphate, melamine cyanurate, aluminum hypophosphite, or aluminum diethylphosphite.

[0015] Optionally, the stabilizer includes at least one of a primary antioxidant, a secondary antioxidant, or a hydrolytic stabilizer; Among them, the main antioxidant is hindered phenols, the auxiliary antioxidant is phosphite, and the hydrolysis stabilizer is carbodiimide.

[0016] Optionally, the antibacterial agent includes chitosan and chitosan derivatives.

[0017] The beneficial effects of this invention are as follows: 1) This invention constructs a bio-based polyol system by adding bio-based polyether polyol, sound-absorbing modified filler, foaming agent, catalyst, foam leveling agent, crosslinking agent, flame retardant, stabilizer and antibacterial agent, and compounding with carbon dioxide-based polyester polyol. It takes into account both low carbon and environmental protection and basic material performance. The various additives work synergistically to achieve the integration of multiple functions such as foam biodegradability, sound absorption, flame retardancy, antibacterial and stability, and solves the pain points of traditional polyurethane foam such as single function, difficult degradation and poor environmental performance.

[0018] 2) This invention utilizes the synergistic effect of composite sound-absorbing modified filler, a reasonable foaming system, and a foam leveling agent to form a uniform porous structure in the foam, effectively improving its sound absorption and noise reduction performance, making it suitable for various sound absorption scenarios.

[0019] 3) This invention improves the mechanical strength, flame retardancy, antibacterial and antifungal properties and thermal stability of materials by optimizing the ratio of polyisocyanate, crosslinking agent, flame retardant, antibacterial agent and stabilizer, and reduces free isocyanate residue, resulting in excellent overall performance and safety and durability. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a flowchart of a method for preparing a biodegradable polyurethane sound-absorbing foam composite material according to an embodiment of the present invention. Detailed Implementation

[0022] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention.

[0023] According to an embodiment of the present invention, a biodegradable polyurethane sound-absorbing foam composite material is provided.

[0024] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. Example 1

[0025] A biodegradable polyurethane sound-absorbing foam composite material, the composite material comprising the following components in parts by weight: 100g of carbon dioxide-based polyester polyol; 30g of bio-based polyether polyol; 90g of polyisocyanate; 10g of sound-absorbing modified filler; 7.5g of foaming agent; Catalyst 0.3g; Foaming agent 0.8g; Crosslinking agent 1.5g; 8g of flame retardant; Stabilizer 0.5g; Antibacterial agent 0.5g.

[0026] Polyisocyanates include polymeric diphenylmethane diisocyanate (polymeric MDI); The isocyanate group content of the polyisocyanate is 30-32 wt%.

[0027] Sound-absorbing modified fillers include diatomaceous earth and plant fiber powder; Among them, plant fiber powder includes bamboo powder, hemp fiber and coconut shell fiber.

[0028] Foaming agents include chemical foaming agents and physical foaming agents; The chemical foaming agent is deionized water; the physical foaming agents include cyclopentane. The amount of deionized water added is 1.5g, and the amount of physical foaming agent added is 6g.

[0029] Catalysts include foaming catalysts and gel catalysts; The foaming catalyst includes pentamethyldiethylenetriamine (PC-5, PMDETA); The gel catalyst includes stannous octoate (T-9).

[0030] Foaming agents include polyether-modified polydimethylsiloxane; The cloud point of the foam stabilizer is 30-50℃, the viscosity at 25℃ is 500-2000 mPa·s, and the addition amount is 1.0g.

[0031] Crosslinking agents include epoxidized cashew nut shell powder.

[0032] Flame retardants include ammonium polyphosphate (APP).

[0033] Stabilizers include primary antioxidants; Among them, the main antioxidant is hindered phenol (such as pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, i.e., Irganox1010).

[0034] Antibacterial agents include chitosan and chitosan derivatives.

[0035] The above-mentioned parts by weight of raw materials were selected, and the biodegradable polyurethane sound-absorbing foam composite material was prepared according to a method for preparing biodegradable polyurethane sound-absorbing foam composite material. The preparation method includes the following steps: S1. Add carbon dioxide-based polyester polyol and bio-based polyether polyol to a reaction vessel, heat to 45-65℃, and stir at 300-500 rpm until homogeneous; add sound-absorbing modified filler, flame retardant, stabilizer and antibacterial agent in sequence, increase the speed to 1000-2500 rpm, and disperse for 15-30 minutes; add foaming agent, crosslinking agent and foaming agent and catalyst, and continue stirring for 1-5 minutes until homogeneous to obtain material A; S2. Place the polyisocyanate as material B in the reactor and cool it to 1-5℃; S3. Quickly add component A to component B and stir at 1500-2500 rpm for 5-15 seconds to fully mix component A and component B to obtain a foamed mixture. S4. Immediately inject the foaming mixture into a mold preheated to 40-50℃, and allow it to foam freely at 40-50℃ for 15-60 minutes. S5. After foaming, demold the foam and place it in an oven at 70-100℃ for 1-5 hours to cure. After curing, remove it and cool it to room temperature to obtain biodegradable polyurethane sound-absorbing foam composite material. Example 2

[0036] A biodegradable polyurethane sound-absorbing foam composite material, the composite material comprising the following components in parts by weight: 110g of carbon dioxide-based polyester polyol; Bio-based polyether polyol 40g; 115g of polyisocyanate; 15g of sound-absorbing modified filler; 10g of foaming agent; Catalyst 0.6g; Foaming agent 1.15g; Crosslinking agent 2.25g; Flame retardant 11.5g; Stabilizer 1g; Antibacterial agent 1.25g.

[0037] Polyisocyanates include liquefied diphenylmethane diisocyanate (liquefied MDI). The isocyanate group content of the polyisocyanate is 30-32 wt%.

[0038] Sound-absorbing modified fillers include hollow glass microspheres and plant fiber powder; Among them, plant fiber powder includes bamboo powder, hemp fiber and coconut shell fiber.

[0039] Foaming agents include chemical foaming agents and physical foaming agents; The chemical foaming agent is deionized water; the physical foaming agents include cyclopentane. The amount of deionized water added is 1.5-2.5 parts, and the amount of physical foaming agent added is 6-10 parts.

[0040] Catalysts include foaming catalysts and gel catalysts; The foaming catalyst includes bis(dimethylaminoethyl) ether (A-1); The gel catalyst includes stannous octoate (T-9).

[0041] Foaming agents include polyether-modified polydimethylsiloxane; The cloud point of the foam stabilizer is 30-50℃, the viscosity at 25℃ is 500-2000 mPa·s, and the addition amount is 1.0-1.5 parts.

[0042] Crosslinking agents include amino-terminated hyperbranched polyesters.

[0043] Flame retardants include ammonium polyphosphate (APP).

[0044] Stabilizers include auxiliary antioxidants; Among them, the auxiliary antioxidants are phosphites (such as tris(2,4-di-tert-butylphenyl)phosphite, i.e., Irgafos168).

[0045] Antibacterial agents include chitosan and chitosan derivatives.

[0046] The above-mentioned parts by weight of raw materials were selected, and the biodegradable polyurethane sound-absorbing foam composite material was prepared according to a method for preparing biodegradable polyurethane sound-absorbing foam composite material. The preparation method includes the following steps: S1. Add carbon dioxide-based polyester polyol and bio-based polyether polyol to a reaction vessel, heat to 45-65℃, and stir at 300-500 rpm until homogeneous; add sound-absorbing modified filler, flame retardant, stabilizer and antibacterial agent in sequence, increase the speed to 1000-2500 rpm, and disperse for 15-30 minutes; add foaming agent, crosslinking agent and foaming agent and catalyst, and continue stirring for 1-5 minutes until homogeneous to obtain material A; S2. Place the polyisocyanate as material B in the reactor and cool it to 1-5℃; S3. Quickly add component A to component B and stir at 1500-2500 rpm for 5-15 seconds to fully mix component A and component B to obtain a foamed mixture. S4. Immediately inject the foaming mixture into a mold preheated to 40-50℃, and allow it to foam freely at 40-50℃ for 15-60 minutes. S5. After foaming, demold the foam and place it in an oven at 70-100℃ for 1-5 hours to cure. After curing, remove it and cool it to room temperature to obtain biodegradable polyurethane sound-absorbing foam composite material. Example 3

[0047] A biodegradable polyurethane sound-absorbing foam composite material, the composite material comprising the following components in parts by weight: 120g of carbon dioxide-based polyester polyol; 50g of bio-based polyether polyol; 120g of polyisocyanate; 20g of sound-absorbing modified filler; 12.5g of foaming agent; Catalyst 0.9g; Foaming agent 1.5g; Crosslinking agent 3.0g; 15g flame retardant; Stabilizer 1.5g; Antibacterial agent 2.0g.

[0048] Polyisocyanates include carbodiimide-modified diphenylmethane diisocyanate; The isocyanate group content of the polyisocyanate is 30-32 wt%.

[0049] Sound-absorbing modified fillers include activated carbon and plant fiber powder; Among them, plant fiber powder includes bamboo powder, hemp fiber and coconut shell fiber.

[0050] Foaming agents include chemical foaming agents and physical foaming agents; The chemical foaming agent is deionized water; the physical foaming agents include cyclopentane. The amount of deionized water added is 1.5-2.5 parts, and the amount of physical foaming agent added is 6-10 parts.

[0051] Catalysts include foaming catalysts and gel catalysts; The foaming catalyst includes pentamethyldiethylenetriamine (PC-5, PMDETA); The gel catalyst includes stannous octoate (T-9).

[0052] Foaming agents include polyether-modified polydimethylsiloxane; The cloud point of the foam stabilizer is 30-50℃, the viscosity at 25℃ is 500-2000 mPa·s, and the addition amount is 1.0-1.5 parts.

[0053] Crosslinking agents include cyclic trimethylolpropane acetal.

[0054] Flame retardants include aluminum diethylphosphonate (ADP).

[0055] Stabilizers include hydrolysis stabilizers; Among them, the hydrolysis stabilizer is a carbodiimide (such as polycarbodiimide).

[0056] Antibacterial agents include chitosan and chitosan derivatives.

[0057] The above-mentioned parts by weight of raw materials were selected, and the biodegradable polyurethane sound-absorbing foam composite material was prepared according to a method for preparing biodegradable polyurethane sound-absorbing foam composite material. The preparation method includes the following steps: S1. Add carbon dioxide-based polyester polyol and bio-based polyether polyol to a reaction vessel, heat to 45-65℃, and stir at 300-500 rpm until homogeneous; add sound-absorbing modified filler, flame retardant, stabilizer and antibacterial agent in sequence, increase the speed to 1000-2500 rpm, and disperse for 15-30 minutes; add foaming agent, crosslinking agent and foaming agent and catalyst, and continue stirring for 1-5 minutes until homogeneous to obtain material A; S2. Place the polyisocyanate as material B in the reactor and cool it to 1-5℃; S3. Quickly add component A to component B and stir at 1500-2500 rpm for 5-15 seconds to fully mix component A and component B to obtain a foamed mixture. S4. Immediately inject the foaming mixture into a mold preheated to 40-50℃, and allow it to foam freely at 40-50℃ for 15-60 minutes. S5. After foaming, demold the foam and place it in an oven at 70-100℃ for 1-5 hours to cure. After curing, remove it and cool it to room temperature to obtain biodegradable polyurethane sound-absorbing foam composite material. Comparative Example 1

[0058] A biodegradable polyurethane sound-absorbing foam composite material, the composite material comprising the following components in parts by weight: 130g of carbon dioxide-based polyester polyol; 90g of polyisocyanate; 10g of filler; 7.5g of foaming agent; Catalyst 0.3g; Foaming agent 0.8g; Crosslinking agent 1.5g; Flame retardant 8g.

[0059] The polyisocyanate is pure diphenylmethane diisocyanate (pure MDI).

[0060] The filler is talc.

[0061] The foaming agent consists of 1.5g of deionized water and 6g of cyclopentane.

[0062] The catalyst is triethylenediamine (A-33).

[0063] The foam stabilizer is ordinary polyether modified silicone oil (L-580).

[0064] The crosslinking agent is ethylene glycol.

[0065] The flame retardant is trichloroethyl phosphate (TCPP).

[0066] Select the above-mentioned parts by weight of raw materials and prepare them according to the following preparation method: S1. Add carbon dioxide-based polyester polyol to a reaction vessel, heat to 45-65℃, and stir at 300-500 rpm until homogeneous; add filler and flame retardant in sequence, increase the speed to 1000-2500 rpm, and disperse for 15-30 minutes; add foam stabilizer, crosslinking agent, foaming agent and catalyst, and continue stirring for 1-5 minutes until homogeneous to obtain material A; S2. Place the polyisocyanate as material B in the reactor and cool it to 1-5℃; S3. Quickly add component A to component B and stir at 1500-2500 rpm for 5-15 seconds to fully mix component A and component B to obtain a foamed mixture. S4. Immediately inject the foaming mixture into a mold preheated to 40-50℃, and allow it to foam freely at 40-50℃ for 15-60 minutes. S5. After foaming, demold the foam and place it in an oven at 70-100℃ for 1-5 hours to cure. After curing, remove it and cool it to room temperature to obtain biodegradable polyurethane sound-absorbing foam composite material. Comparative Example 2

[0067] A biodegradable polyurethane sound-absorbing foam composite material, the composite material comprising the following components in parts by weight: 70g of carbon dioxide-based polyester polyol; 60g of toluene diisocyanate; 10g of filler; 7.5g of foaming agent; Catalyst 0.3g; Crosslinking agent 1.5g; 6g flame retardant; Stabilizer 0.5g.

[0068] The polyisocyanate is toluene diisocyanate (TDI80 / 20).

[0069] The filler is light calcium carbonate.

[0070] The foaming agent consists of 2.5g of deionized water and 5g of dichloromethane, a physical foaming agent.

[0071] The catalyst is stannous octoate (T-9).

[0072] The crosslinking agent is trimethylolpropane (TMP).

[0073] The flame retardant is antimony trioxide.

[0074] The stabilizer is triphenyl phosphite (TPP).

[0075] Select the above-mentioned parts by weight of raw materials and prepare them according to the following preparation method: S1. Add carbon dioxide-based polyester polyol and bio-based polyether polyol to a reaction vessel, heat to 45-65℃, and stir at 300-500 rpm until homogeneous; add filler, flame retardant, and stabilizer in sequence, increase the speed to 1000-2500 rpm, and disperse for 15-30 minutes; add crosslinking agent, foaming agent, and catalyst, and continue stirring for 1-5 minutes until homogeneous to obtain material A; S2. Toluene diisocyanate (TDI) is placed in the reactor as material B and cooled to 1-5℃; S3. Quickly add component A to component B and stir at 1500-2500 rpm for 5-15 seconds to fully mix component A and component B to obtain a foamed mixture. S4. Immediately inject the foaming mixture into a mold preheated to 40-50℃, and allow it to foam freely at 40-50℃ for 15-60 minutes. S5. After foaming, demold the foam and place it in an oven at 70-100℃ for 1-5 hours to cure. After curing, remove it and cool it to room temperature to obtain biodegradable polyurethane sound-absorbing foam composite material. Comparative Example 3

[0076] A biodegradable polyurethane sound-absorbing foam composite material, the composite material comprising the following components in parts by weight: 180g of carbon dioxide-based polyester polyol; 90g of polymeric MDI; 10g of filler; 7.5g of foaming agent; Foaming agent 0.8g; Flame retardant 8g.

[0077] The polyisocyanate is polymeric MDI (PM-200).

[0078] The filler is ordinary poplar wood powder.

[0079] The foaming agent consists of 2.0g of deionized water and 5.5g of cyclopentane.

[0080] The foam stabilizer is polyether-modified silicone oil (B8404).

[0081] The flame retardant is aluminum hydroxide (ATH).

[0082] Select the above-mentioned parts by weight of raw materials and prepare them according to the following preparation method: S1. Add carbon dioxide-based polyester polyol and bio-based polyether polyol to a reaction vessel, heat to 30°C, and stir at 300-500 rpm until homogeneous; add filler and flame retardant in sequence, increase the speed to 1000-2500 rpm, and disperse for 15-30 minutes; add foaming agent and foaming agent, and continue stirring for 1-5 minutes until homogeneous to obtain material A; S2. Place the polymerized MDI as material B in the reactor and cool it to 1-5℃; S3. Quickly add component A to component B and stir with a hand mixer for about 30 seconds to fully mix component A and component B to obtain a foamed mixture. S4. Immediately inject the foaming mixture into a mold preheated to 40-50℃, and allow it to foam freely at 40-50℃ for 15-60 minutes. S5. After foaming, demold the foam and place it in an oven at 70-100℃ for 1-5 hours to cure. After curing, remove it and cool it to room temperature to obtain biodegradable polyurethane sound-absorbing foam composite material. experimental group

[0083] Biodegradable polyurethane sound-absorbing foam composite materials prepared in Examples 1, 2, 3, 1, 2, and 3 were selected and placed in containers. Biodegradable polyurethane sound-absorbing foam composite materials of the same specifications were added to initiate the biodegradation reaction. Experimental phenomena were observed and experimental data were recorded. The experimental results are shown in Table 1. Table 1 Comparison of Each Embodiment with the Comparative Example

[0084] As shown in Table 1, the biodegradable polyurethane sound-absorbing foam composite material prepared by this invention has the advantages of excellent biodegradability, strong sound absorption performance, good resilience, high flame retardancy, good antibacterial effect, and high environmental safety. It effectively improves the material's environmental friendliness, acoustic noise reduction ability, use stability, fire safety performance and hygiene protection performance, and solves the technical defects of traditional polyurethane foam, such as difficulty in degradation, poor sound absorption effect, low resilience, weak flame retardant and antibacterial performance, and high free isocyanate residue.

[0085] In summary, by utilizing the above-mentioned technical solutions of this invention, the present invention constructs a bio-based polyol system by adding bio-based polyether polyols, sound-absorbing modified fillers, foaming agents, catalysts, foam levelers, crosslinking agents, flame retardants, stabilizers, and antibacterial agents, and compounding them with carbon dioxide-based polyester polyols. This system balances low-carbon environmental protection with basic material performance. The synergistic effect of each additive achieves multi-functional integration of foam biodegradability, sound absorption, flame retardancy, antibacterial properties, and stability, solving the pain points of traditional polyurethane foams, such as single function, difficulty in degradation, and poor environmental performance. This invention, through the synergistic effect of composite sound-absorbing modified fillers, a rational foaming system, and foam levelers, enables the foam to form a uniform porous structure, effectively improving sound absorption and noise reduction performance, making it suitable for various sound absorption scenarios. This invention, by optimizing the ratio of polyisocyanates, crosslinking agents, flame retardants, antibacterial agents, and stabilizers, improves the material's mechanical strength, flame retardancy rating, antibacterial and antifungal capabilities, and thermal stability, while reducing free isocyanate residue, resulting in excellent overall performance and durability.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A biodegradable polyurethane acoustic foam composite material, characterized in that, The composite material comprises the following components in parts by weight: 100-120 parts of carbon dioxide-based polyester polyol; 30-50 parts of bio-based polyether polyol; 90-120 parts of polyisocyanate; 10-20 parts of sound-absorbing modified filler; 7.5-12.5 parts of foaming agent; Catalyst 0.3-0.9 parts; Foaming agent 0.8-1.5 parts; Crosslinking agent 1.5-3.0 parts; 8-15 parts flame retardant; Stabilizer 0.5-1.5 parts; Antibacterial agent 0.5-2.0 parts.

2. The biodegradable polyurethane sound-absorbing foam composite material according to claim 1, characterized in that, The polyisocyanate includes at least one of polymerized diphenylmethane diisocyanate, liquefied diphenylmethane diisocyanate, or carbodiimide-modified diphenylmethane diisocyanate; The isocyanate group content of the polyisocyanate is 30-32 wt%.

3. The biodegradable polyurethane sound-absorbing foam composite material according to claim 1, characterized in that, The sound-absorbing modified filler includes at least two of the following: diatomaceous earth, zeolite powder, activated carbon, bamboo charcoal powder, expanded perlite, hollow glass microspheres, or plant fiber powder. The plant fiber powder includes bamboo powder, hemp fiber, and coconut shell fiber.

4. The biodegradable polyurethane sound-absorbing foam composite material according to claim 1, characterized in that, The foaming agent includes chemical foaming agents and physical foaming agents; The chemical foaming agent is deionized water; The physical foaming agent includes at least one of cyclopentane, HFC-245fa, or liquid carbon dioxide; The amount of deionized water added is 1.5-2.5 parts, and the amount of physical foaming agent added is 6-10 parts.

5. The biodegradable polyurethane sound-absorbing foam composite material according to claim 1, characterized in that, The catalyst includes a foaming catalyst and a gel catalyst; The foaming catalyst includes at least one of pentamethyldiethylenetriamine or bis(dimethylaminoethyl) ether; The gel catalyst includes at least one of stannous octoate or bismuth neodecanoate.

6. The biodegradable polyurethane sound-absorbing foam composite material according to claim 1, characterized in that, The foaming agent includes at least one of polyether-modified polydimethylsiloxane or a biodegradable organosilicon-polyether copolymer. The foaming agent has a cloud point of 30-50℃, a viscosity of 500-2000 mPa·s at 25℃, and an addition amount of 1.0-1.5 parts.

7. The biodegradable polyurethane sound-absorbing foam composite material according to claim 1, characterized in that, The crosslinking agent includes at least one of epoxidized cashew phenol, gallic acid, amino-terminated hyperbranched polyester, or cyclic trimethylolpropane formal.

8. The biodegradable polyurethane sound-absorbing foam composite material according to claim 1, characterized in that, The flame retardant includes at least one of ammonium polyphosphate, melamine cyanurate, aluminum hypophosphite, or aluminum diethylphosphite.

9. The biodegradable polyurethane sound-absorbing foam composite material according to claim 1, characterized in that, The stabilizer includes at least one of a primary antioxidant, a secondary antioxidant, or a hydrolytic stabilizer. Among them, the main antioxidant is hindered phenols, the auxiliary antioxidant is phosphite, and the hydrolysis stabilizer is carbodiimide.

10. The biodegradable polyurethane sound-absorbing foam composite material according to claim 1, characterized in that, The antibacterial agent includes chitosan and chitosan derivatives.

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