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CN-121989539-A - Sound-absorbing and noise-reducing material for vehicle and preparation method thereof

CN121989539ACN 121989539 ACN121989539 ACN 121989539ACN-121989539-A

Abstract

The application provides a sound-absorbing and noise-reducing material for a vehicle and a preparation method thereof, wherein the sound-absorbing and noise-reducing material for the vehicle comprises a structure sound-insulating layer and a damping vibration-absorbing layer which are stacked, the structure sound-insulating layer comprises, by mass, 55 parts of thermoplastic vulcanized elastomer, 10-15 parts of sodium stearate surface modified calcium carbonate micro powder, 20-25 parts of chitosan-chitosan oligosaccharide composite micro powder, 1.5-1.8 parts of polyethylene glycol, 1.2-1.8 parts of antioxidant 1010, 1.2-1.8 parts of antioxidant 168, and the damping vibration-absorbing layer comprises, by mass, 58 parts of polyamide 66, 13-14 parts of POE-g-MAH, 7-9 parts of epoxidized lignin, 4-6 parts of ethylene propylene diene monomer rubber, 10-15 parts of sodium stearate surface modified calcium carbonate micro powder, 1-3 parts of polyethylene glycol, 0.1-0.2 part of zinc oxide, 0.5-0.8 part of antioxidant 1010 and 0.2-0.5 part of antioxidant 168. The sound-absorbing and noise-reducing material for the vehicle has excellent sound-insulating and noise-reducing performances in the frequency range of 200-2000Hz, and is suitable for a sound-insulating pad, a floor assembly and a vehicle door inner plate of an engine room of a vehicle.

Inventors

  • CHENG XI
  • CHENG ZHENGWEI
  • ZHU WENLIN

Assignees

  • 湖北博兴复合材料股份有限公司

Dates

Publication Date
20260508
Application Date
20260225

Claims (10)

  1. 1. The sound-absorbing and noise-reducing material for the vehicle is characterized by comprising a structural sound-insulating layer and a damping vibration-absorbing layer which are arranged in a laminated mode; the sound insulation layer comprises the following raw materials in parts by mass: 55 parts of thermoplastic vulcanized elastomer, 10-15 parts of sodium stearate surface modified calcium carbonate micro powder, 20-25 parts of chitosan-chitosan oligosaccharide composite micro powder, 1.5-1.8 parts of polyethylene glycol, 1.2-1.8 parts of antioxidant 1010 and 1.2-1.8 parts of antioxidant 168; The damping vibration absorption layer comprises the following raw materials in parts by mass: 58 parts of polyamide 66, 13-14 parts of POE-g-MAH, 7-9 parts of epoxidized lignin, 4-6 parts of ethylene propylene diene monomer rubber, 10-15 parts of sodium stearate surface modified calcium carbonate micro powder, 1-3 parts of polyethylene glycol, 0.1-0.2 part of zinc oxide, 0.5-0.8 part of antioxidant 1010 and 0.2-0.5 part of antioxidant 168.
  2. 2. The sound absorbing and noise reducing material for vehicles according to claim 1, wherein the sodium stearate surface modified calcium carbonate micropowder comprises the following preparation steps: dispersing stearic acid, ethanol and NaOH in water, and carrying out acid-base neutralization reaction on the stearic acid and the NaOH to obtain sodium stearate dispersion; and mixing the calcium carbonate micropowder, sodium bicarbonate and the sodium stearate dispersion liquid to enable sodium stearate to be adsorbed on the surface of the calcium carbonate micropowder, so as to obtain the sodium stearate surface modified calcium carbonate micropowder.
  3. 3. The sound absorbing and noise reducing material for vehicles according to claim 2, wherein the sodium stearate surface modified calcium carbonate micropowder comprises the following preparation steps: Dispersing 1-3 parts of stearic acid, 5-10 parts of ethanol and 0.1-0.3 part of NaOH in 20-40 parts of water, and reacting at 60-70 ℃ for 30-60min to perform acid-base neutralization reaction on the stearic acid and the NaOH to obtain sodium stearate dispersion; Mixing 100 parts of calcium carbonate micropowder and 0.2-0.5 part of sodium bicarbonate with the sodium stearate dispersion liquid, and stirring for 30-60min at 30-50 ℃ to enable sodium stearate to be adsorbed on the surface of the calcium carbonate micropowder, so as to obtain the sodium stearate surface modified calcium carbonate micropowder.
  4. 4. The sound absorbing and reducing material for vehicles according to claim 1, wherein the chitosan-chitosan oligosaccharide composite micropowder comprises the following preparation steps: dispersing chitosan, chitosan oligosaccharide and acetic acid in water to enable chitosan and chitosan oligosaccharide amino groups to be protonated, so as to obtain homogeneous aqueous phase sol; Mixing the homogeneous aqueous phase sol, citric acid, divalent metal ion organic acid salt and water to enable amino and hydroxyl groups in chitosan and chitosan oligosaccharide to be subjected to multiple complexing crosslinking with divalent metal ions in the divalent metal ion organic acid salt under the action of tricarboxylic acid ligand of the citric acid, so as to obtain chitosan-chitosan oligosaccharide composite micro powder; the divalent metal ion organic acid salt comprises at least one of zinc citrate, magnesium citrate, calcium citrate, zinc glycinate and magnesium lactate.
  5. 5. The sound absorbing and reducing material for vehicles according to claim 4, wherein the chitosan-chitosan oligosaccharide composite micropowder comprises the following preparation steps: Dispersing 4 parts of chitosan, 1.5-2 parts of chitosan oligosaccharide and 1.5-2 parts of acetic acid in 60-80 parts of water, and reacting at 25-40 ℃ for 60-120min to obtain homogeneous aqueous sol; mixing the homogeneous aqueous phase sol, 0.5-1 part of citric acid, 0.2-0.8 part of divalent metal ion organic acid salt and 40-60 parts of water, reacting for 60-120min at 25-40 ℃, standing and aging for 6-8h, carrying out solid-liquid separation, drying, and carrying out air flow classification to obtain the chitosan-chitosan oligosaccharide composite micro powder with the average particle size of 0.5-1.5 mu m.
  6. 6. The sound absorbing and noise reducing material for vehicles according to claim 1, wherein the epoxidized lignin comprises the following preparation steps: Dispersing low-ash Kraft lignin and boron tribromide in an organic solvent to cause the low-ash Kraft lignin to undergo a demethylation reaction to obtain demethylated lignin; Dispersing the demethylated lignin and alkali metal hydroxide in a polar organic solvent, activating the alcoholic hydroxyl and the phenolic hydroxyl of the demethylated lignin, adding epoxy chloropropane and tetra-n-butyl ammonium bromide, and carrying out epoxy ring-opening grafting reaction on the alcoholic hydroxyl and the phenolic hydroxyl activated by the demethylated lignin and the epoxy groups of the epoxy chloropropane under the catalysis of the tetra-n-butyl ammonium bromide to obtain epoxidized lignin; The organic solvent comprises at least one of methanol, ethanol, isopropanol, acetone, methyl ethyl ketone, N-dimethylformamide and tetrahydrofuran, the alkali metal hydroxide comprises at least one of sodium hydroxide, potassium hydroxide and lithium hydroxide, and the polar organic solvent comprises at least one of dimethylformamide, N-methylpyrrolidone, acetonitrile and dimethyl sulfoxide.
  7. 7. The sound absorbing and noise reducing material for vehicles according to claim 6, wherein the epoxidized lignin comprises the following preparation steps: Dispersing 100 parts of low-ash Kraft lignin and 80-120 parts of boron tribromide in 200-500 parts of organic solvent, stirring at a speed of 200-350rpm for 4-6 hours at 0-10 ℃ under nitrogen atmosphere, heating to 25-45 ℃ and preserving heat for 1-1.5 hours to enable the low-ash Kraft lignin to undergo a demethylation reaction to obtain the demethylated lignin; Dispersing 80 parts of demethylated lignin and 8-16 parts of alkali metal hydroxide in 300-600 parts of polar organic solvent, stirring at 35-55 ℃ for 1-2 hours at the speed of 300-500rpm, then adding 80-120 parts of epichlorohydrin and 2-4 parts of tetra-n-butyl ammonium bromide, and reacting at 50-80 ℃ for 4-6 hours at the stirring speed of 300-500rpm to obtain epoxidized lignin.
  8. 8. The preparation method of the sound-absorbing and noise-reducing material for the vehicle is characterized by comprising the following steps of: 1) Providing the raw materials of the structural sound insulation layer and the damping vibration absorption layer in the sound absorption and noise reduction material for the vehicle according to any one of claims 1 to 7; 2) Mixing the raw materials of the structural sound insulation layer, and performing melt coextrusion and multi-roll calendaring to obtain the structural sound insulation layer; 3) Mixing the raw materials of the damping vibration absorption layer, and performing melt coextrusion and multi-roll calendaring to obtain the damping vibration absorption layer; 4) And compounding the structural sound insulation layer and the damping vibration absorption layer through primer, sealant and hot melt adhesive through a hot pressing treatment process to obtain the sound absorption and noise reduction material for the vehicle.
  9. 9. The method according to claim 8, wherein the temperature of the autoclave process is controlled to 120-150 ℃, the pressure is controlled to 0.2-0.5MPa, and the dwell time is 1-3min.
  10. 10. The sound absorbing and reducing material for vehicle according to any one of claims 1 to 7 or the sound absorbing and reducing material for vehicle according to claim 8 or 9 is suitable for use in an engine compartment soundproofing pad, a floor assembly, and a door inner panel.

Description

Sound-absorbing and noise-reducing material for vehicle and preparation method thereof Technical Field The application relates to the technical field of acoustic materials, in particular to a sound-absorbing and noise-reducing material for a vehicle and a preparation method thereof. Background In urban traffic and high-speed running environment, the driving experience is affected by the structural vibration of engine noise, road noise, wind noise, engine cabin sound insulation pads, floor assemblies and vehicle door inner plates, so that the sound-absorbing and noise-reducing material for the vehicle becomes a key ring for improving the quality of the whole vehicle. At present, the main stream sound absorbing material for vehicles mostly adopts a single-layer foam, non-woven fabrics or simple composite structure, the sound absorbing and noise reducing capability is limited, and the structural strength and the sound absorbing performance of partial double-layer or multi-layer composite materials are improved, but the material system design lacks a cooperative mechanism, so that the overall performance improvement is limited. Therefore, development of a sound-absorbing and noise-reducing material for a composite vehicle with reasonable structure and material cooperation is needed. Disclosure of Invention The application provides a sound-absorbing and noise-reducing material for a vehicle and a preparation method thereof. In a first aspect, the application provides a sound-absorbing and noise-reducing material for a vehicle, which comprises a structural sound-insulating layer and a damping vibration-absorbing layer which are stacked; the sound insulation layer comprises the following raw materials in parts by mass: 55 parts of thermoplastic vulcanized elastomer, 10-15 parts of sodium stearate surface modified calcium carbonate micro powder, 20-25 parts of chitosan-chitosan oligosaccharide composite micro powder, 1.5-1.8 parts of polyethylene glycol, 1.2-1.8 parts of antioxidant 1010 and 1.2-1.8 parts of antioxidant 168; The damping vibration absorption layer comprises the following raw materials in parts by mass: 58 parts of polyamide 66, 13-14 parts of POE-g-MAH, 7-9 parts of epoxidized lignin, 4-6 parts of ethylene propylene diene monomer rubber, 10-15 parts of sodium stearate surface modified calcium carbonate micro powder, 1-3 parts of polyethylene glycol, 0.1-0.2 part of zinc oxide, 0.5-0.8 part of antioxidant 1010 and 0.2-0.5 part of antioxidant 168. Through the embodiment, the sodium stearate surface modified calcium carbonate micro powder in the structural sound insulation layer is used as the inorganic filler, so that the density and rigidity of the structural sound insulation layer can be improved, the reflection capability of low-frequency sound waves is enhanced, and the penetration is reduced; the chitosan-chitosan oligosaccharide composite micro powder endows a certain micropore structure to the back layer, forms a multiple sound wave scattering path, improves the energy dissipation efficiency, absorbs middle and high frequency noise, is compounded with sodium stearate surface modified calcium carbonate micro powder, realizes the sound absorption and noise reduction effect of wide frequency band, enables the thermoplastic vulcanized elastomer to convert mechanical vibration into heat energy, reduces structural noise, can effectively decompose peroxide at high processing temperature to protect the thermoplastic vulcanized elastomer from degradation and yellowing during melting, enables the antioxidant 1010 to provide long-term thermal oxygen stability, ensures that the final product is not easy to age, embrittle or change color during later use and storage, and cooperates with the antioxidant 168 to ensure that the sound insulation layer of the structure is stable during preparation and long-term use, maintains the sound absorption and noise reduction effect, and enables the polyethylene glycol to serve as a processing aid or lubricant, to improve the fluidity of melt, enable extrusion to be smoother, enable the thermoplastic vulcanized elastomer to be molded more easily during calendaring, and be beneficial to the dispersion of the surface modified calcium carbonate micro powder and the chitosan-chitosan oligosaccharide composite micro powder, enables the sound insulation layer to not to be easy to resist the sound wave nonlinear dissipation, and enable the sound insulation layer to be not to effectively inhibit the sound wave vibration and vibration; The damping vibration absorption layer is constructed through multi-component collaborative design and interface reaction, so that excellent vibration dissipation and sound insulation performance are realized; wherein zinc oxide is used as a Lewis acid catalyst in the melt blending process to promote the grafting reaction of the amide group of polyamide 66 (PA 66) and the maleic anhydride group of POE-g-MAH to form an amide-anhydride graft copolymer