Sound-absorbing cotton for automobile shock absorption and sound absorption and its preparation method

Abstract

This invention relates to the field of sound-absorbing cotton technology, and proposes a sound-absorbing cotton for automotive vibration damping and sound absorption, and its preparation method. The sound-absorbing cotton for automotive vibration damping and sound absorption comprises the following components in parts by weight: 40-60 parts hollow fiber, 40-60 parts glass fiber, 10-30 parts carbon fiber, 20-40 parts polyester fiber, 30-50 parts polyacrylonitrile fiber, 10-15 parts phenolic resin, 3-8 parts surfactant, 2-6 parts 2,2,3-triethylethylene oxide, 0.5-1.5 parts water-repellent agent, and 25-45 parts water. The preparation method of the sound-absorbing cotton includes the following steps: S1, mixing water, 2,2,3-triethylethylene oxide, surfactant, phenolic resin, and water-repellent agent evenly to obtain a binder for later use; S2, mixing hollow fiber, glass fiber, carbon fiber, polyester fiber, and polyacrylonitrile fiber evenly, forming a web and combing, spraying the binder onto the upper and lower surfaces, and hot-pressing to obtain the sound-absorbing cotton for automotive vibration damping and sound absorption. The above technical solution solves the problems of low mechanical strength and high moisture permeability of sound-absorbing cotton in the existing technology.

Description

Technical Field

[0001] This invention relates to the field of sound-absorbing cotton technology, specifically to a sound-absorbing cotton for automotive vibration damping and sound absorption, and its preparation method. Background Technology

[0002] Sound-absorbing cotton is a man-made inorganic fiber that has been widely used in various parts of automobiles, especially in interior materials such as A-plates, B-plates, door panels, dashboards, trunks, and headliners.

[0003] Sound absorption refers to the reduction of sound energy when sound waves pass through a medium or are incident on the interface between a medium and a medium. When the medium is air, the sound waves gradually attenuate with increasing propagation distance due to the vibration of air particles; this is called air absorption. When the interface between the medium and a material surface, some sound energy is absorbed; this is called material absorption. Any material, due to its porosity, thin-film effect, or resonance, has some degree of sound absorption capacity for incident sound energy.

[0004] Hollow fibers, due to their hollow structure, can provide excellent sound insulation and vibration damping effects, and are widely used as the matrix material for automotive sound-absorbing and vibration-damping cotton. However, their hollow structure also has problems such as low mechanical strength and good moisture permeability, which seriously affects their application in automobiles. Summary of the Invention

[0005] This invention proposes a sound-absorbing cotton for automotive vibration damping and sound absorption, and its preparation method, which solves the problems of low mechanical strength and good moisture permeability of sound-absorbing cotton in related technologies.

[0006] The technical solution of the present invention is as follows:

[0007] A sound-absorbing cotton for automotive vibration damping and sound absorption comprises the following components in parts by weight: 40-60 parts hollow fiber, 40-60 parts glass fiber, 10-30 parts carbon fiber, 20-40 parts polyester fiber, 30-50 parts polyacrylonitrile fiber, 10-15 parts phenolic resin, 3-8 parts surfactant, 2-6 parts 2,2,3-triethylethylene oxide, 0.5-1.5 parts water repellent, and 25-45 parts water.

[0008] As a further technical solution, the mass ratio of the phenolic resin to 2,2,3-triethyl ethylene oxide is 3:1.

[0009] As a further technical solution, the hydrophobic agent includes one or more of polysiloxane hydrophobic agents and potassium methylsilicate hydrophobic agents.

[0010] As a further technical solution, the surfactant is Tween 20.

[0011] As a further technical solution, the components include the following parts by weight: 40 parts hollow fiber, 40 parts glass fiber, 10 parts carbon fiber, 20 parts polyester fiber, 30 parts polyacrylonitrile fiber, 15 parts phenolic resin, 3 parts surfactant, 5 parts 2,2,3-triethyl ethylene oxide, 0.5 parts water repellent, and 25 parts water.

[0012] This invention also proposes a method for preparing sound-absorbing cotton for automotive vibration damping and sound absorption, comprising the following steps:

[0013] S1. Mix water, 2,2,3-triethyl ethylene oxide, surfactant, phenolic resin, and water-repellent agent evenly to obtain an adhesive for later use;

[0014] S2. Hollow fiber, glass fiber, carbon fiber, polyester fiber, and polyacrylonitrile fiber are mixed evenly, combed into a web, and the adhesive is sprayed onto the upper and lower surfaces. The mixture is then hot-pressed to obtain sound-absorbing cotton for automotive vibration damping and sound absorption.

[0015] As a further technical solution, the mixing in S1 is carried out by stirring first and then sonicating.

[0016] As a further technical solution, the mixture is first stirred at 25–35°C for 15–25 minutes, and then sonicated at 25–35°C for 20–30 minutes.

[0017] As a further technical solution, the mixture is first stirred at 30°C for 15 minutes, and then sonicated at 25°C for 20 minutes.

[0018] As a further technical solution, the hot pressing temperature is 130℃, the pressure is 4MPa, and the time is 15min.

[0019] The working principle and beneficial effects of this invention are as follows:

[0020] 1. This invention improves the mechanical strength and waterproof performance of sound-absorbing cotton by adding 2,2,3-triethyl ethylene oxide. This is likely because the molecular structure of 2,2,3-triethyl ethylene oxide contains alkyl and epoxy groups. During the hot pressing process of the sound-absorbing cotton, the epoxy groups interact with the phenolic resin, causing a certain deflection of the molecular structure of 2,2,3-triethyl ethylene oxide. The alkyl groups deflect onto the surface of the sound-absorbing cotton, forming a "waterproof barrier," thereby improving the mechanical strength and waterproof performance of the sound-absorbing cotton and solving the problems of low mechanical strength and high moisture permeability of sound-absorbing cotton in the prior art.

[0021] 2. This invention limits the mass ratio of phenolic resin to 2,2,3-triethyl ethylene oxide to within the range of 3:1, which further improves the mechanical strength and waterproof performance of the sound-absorbing cotton. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a frequency-sound transmission loss image of the sound-absorbing cotton obtained in Embodiment 1 of the present invention. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1

[0026] S1. Preparation of adhesive: Mix 35 parts water, 4 parts 2,2,3-triethyl ethylene oxide, 5 parts Tween 20, 12 parts phenolic resin, and 1 part polysiloxane water-repellent agent. Stir at 25°C for 20 minutes, then sonicate at 30°C for 25 minutes to obtain the adhesive.

[0027] S2. Preparation of sound-absorbing cotton: Mix 50 parts of hollow fiber, 50 parts of glass fiber, 20 parts of carbon fiber, 30 parts of polyester fiber and 40 parts of polyacrylonitrile fiber evenly, comb them into a web, spray the obtained adhesive on the upper and lower surfaces, hot press at 130℃ and 4MPa for 15 minutes, cut to obtain sound-absorbing cotton.

[0028] Example 2

[0029] S1. Preparation of adhesive: Mix 35 parts water, 6 parts 2,2,3-triethyl ethylene oxide, 5 parts Tween 20, 10 parts phenolic resin, and 1 part polysiloxane water-repellent agent. Stir at 25°C for 20 minutes, then sonicate at 30°C for 25 minutes to obtain the adhesive.

[0030] S2. Preparation of sound-absorbing cotton: Mix 50 parts of hollow fiber, 50 parts of glass fiber, 20 parts of carbon fiber, 30 parts of polyester fiber and 40 parts of polyacrylonitrile fiber evenly, comb them into a web, spray the obtained adhesive on the upper and lower surfaces, hot press at 130℃ and 4MPa for 15 minutes, cut to obtain sound-absorbing cotton.

[0031] Example 3

[0032] S1. Preparation of adhesive: Mix 35 parts water, 2 parts 2,2,3-triethyl ethylene oxide, 5 parts Tween 20, 14 parts phenolic resin, and 1 part polysiloxane water-repellent agent. Stir at 25°C for 20 min, then sonicate at 30°C for 25 min to obtain the adhesive.

[0033] S2. Preparation of sound-absorbing cotton: Mix 50 parts of hollow fiber, 50 parts of glass fiber, 20 parts of carbon fiber, 30 parts of polyester fiber and 40 parts of polyacrylonitrile fiber evenly, comb them into a web, spray the obtained adhesive on the upper and lower surfaces, hot press at 130℃ and 4MPa for 15 minutes, cut to obtain sound-absorbing cotton.

[0034] Example 4

[0035] S1. Preparation of adhesive: Mix 25 parts water, 5 parts 2,2,3-triethyl ethylene oxide, 3 parts Tween 20, 15 parts phenolic resin, and 0.5 parts polysiloxane water-repellent agent. Stir at 30°C for 15 minutes, then sonicate at 25°C for 20 minutes to obtain the adhesive.

[0036] S2. Preparation of sound-absorbing cotton: Mix 40 parts of hollow fiber, 40 parts of glass fiber, 10 parts of carbon fiber, 20 parts of polyester fiber and 30 parts of polyacrylonitrile fiber evenly, form a web and comb it, then spray the obtained adhesive on the upper and lower surfaces, hot press at 130℃ and 4MPa for 15 minutes, and cut to obtain sound-absorbing cotton.

[0037] Example 5

[0038] S1. Preparation of adhesive: Mix 45 parts water, 5 parts 2,2,3-triethyl ethylene oxide, 8 parts Tween 20, 15 parts phenolic resin, and 1.5 parts potassium methylsilicate water-repellent agent. Stir at 35°C for 25 minutes, then sonicate at 35°C for 30 minutes to obtain the adhesive.

[0039] S2. Preparation of sound-absorbing cotton: Mix 60 parts of hollow fiber, 60 parts of glass fiber, 30 parts of carbon fiber, 40 parts of polyester fiber and 50 parts of polyacrylonitrile fiber evenly, comb them into a web, spray the obtained adhesive on the upper and lower surfaces, hot press at 130℃ and 4MPa for 15 minutes, cut to obtain sound-absorbing cotton.

[0040] Comparative Example 1

[0041] The only difference from Example 1 is that 2,2,3-triethylethylene oxide is not added.

[0042] The sound-absorbing cotton obtained in Examples 1 to 5 and Comparative Example 1 was tested for water repellency according to the method in GB / T 10299-2011 "Test Method for Water Repellency of Thermal Insulation Materials" and tensile strength was tested using a universal testing machine. The results are recorded in Table 1.

[0043] Table 1. Water repellency and tensile strength of sound-absorbing cotton

[0044] Hydrophobicity (%) Tensile strength (MPa) Example 1 99.1 26.2 Example 2 98.8 25.6 Example 3 98.6 25.8 Example 4 99.8 27.3 Example 5 99.2 26.0 Comparative Example 1 97.5 24.7

[0045] As can be seen from Table 1, the sound-absorbing cotton provided by the present invention has a water repellency rate of over 98.6% and a tensile strength of over 25.6 MPa, exhibiting good waterproof performance and mechanical strength.

[0046] Compared to Example 1, Comparative Example 1 did not contain 2,2,3-triethylethylene oxide, while Example 1 did. The sound-absorbing cotton obtained in Example 1 had higher water repellency and tensile strength than that in Comparative Example 1. This indicates that adding 2,2,3-triethylethylene oxide can significantly improve the waterproof performance and mechanical strength of the sound-absorbing cotton.

[0047] The sound-absorbing cotton obtained in Examples 1-3 was tested for sound insulation performance using an impedance tube. The results are recorded in Table 2. The frequency-sound transmission loss graph of the sound-absorbing cotton obtained in Example 1 is shown below. Figure 1 As shown.

[0048] Table 2 Sound insulation performance of sound-absorbing cotton

[0049]

[0050] As can be seen from Table 2, the sound-absorbing cotton provided by the present invention has good sound insulation performance.

[0051] The above are merely preferred embodiments of the present invention and are 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 sound-absorbing cotton for automotive vibration damping and sound absorption, characterized in that, The product comprises the following components in parts by weight: 40-60 parts hollow fiber, 40-60 parts glass fiber, 10-30 parts carbon fiber, 20-40 parts polyester fiber, 30-50 parts polyacrylonitrile fiber, 10-15 parts phenolic resin, 3-8 parts surfactant, 2-6 parts 2,2,3-triethyl ethylene oxide, 0.5-1.5 parts water repellent, and 25-45 parts water; wherein the mass ratio of phenolic resin to 2,2,3-triethyl ethylene oxide is 3:

1.

2. The sound-absorbing cotton for automotive vibration damping and sound absorption according to claim 1, characterized in that, The hydrophobic agent includes one or more of polysiloxane hydrophobic agents and potassium methylsilicate hydrophobic agents.

3. The sound-absorbing cotton for automotive vibration damping and sound absorption according to claim 1, characterized in that, The surfactant is Tween 20.

4. The sound-absorbing cotton for automotive vibration damping and sound absorption according to claim 1, characterized in that, The product comprises the following components in parts by weight: 40 parts hollow fiber, 40 parts glass fiber, 10 parts carbon fiber, 20 parts polyester fiber, 30 parts polyacrylonitrile fiber, 15 parts phenolic resin, 3 parts surfactant, 5 parts 2,2,3-triethyl ethylene oxide, 0.5 parts water repellent, and 25 parts water.

5. A method for preparing sound-absorbing cotton for automotive vibration damping and sound absorption according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Mix water, 2,2,3-triethyl ethylene oxide, surfactant, phenolic resin, and water-repellent agent evenly to obtain an adhesive for later use; S2. Hollow fiber, glass fiber, carbon fiber, polyester fiber, and polyacrylonitrile fiber are mixed evenly, combed into a web, and the adhesive is sprayed onto the upper and lower surfaces. The mixture is then hot-pressed to obtain sound-absorbing cotton for automotive vibration damping and sound absorption.

6. The method for preparing sound-absorbing cotton for automotive vibration damping and sound absorption according to claim 5, characterized in that, In S1, the mixing process involves stirring followed by ultrasonication.

7. The method for preparing sound-absorbing cotton for automotive vibration damping and sound absorption according to claim 6, characterized in that, First stir at 25~35℃ for 15~25 minutes, then sonicate at 25~35℃ for 20~30 minutes.

8. The method for preparing sound-absorbing cotton for automotive vibration damping and sound absorption according to claim 7, characterized in that, First stir at 30℃ for 15 minutes, then sonicate at 25℃ for 20 minutes.

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