A fabric / corncob flexible sound-absorbing material imitating a wedge structure and a preparation method thereof

Abstract

The present invention relates to a fabric / corncob flexible sound-absorbing material with a structure imitating a wedge and a preparation method thereof. The preparation method includes: mixing agricultural waste corncob powder and PE powder and evenly spreading them on the surface of the fabric, and obtaining the fabric / corncob material through high-temperature treatment; adhering an adhesive to the surface of the fabric / corncob material and forming it into a wedge shape to obtain the wedge-shaped fabric / corncob material; placing a plurality of wedge-shaped fabric / corncob materials parallel on the surface of the suede fabric, and using the adhesive to bond the fluff on the surface of the suede fabric to the surface of the wedge-shaped fabric / corncob material, thus obtaining the fabric / corncob flexible sound-absorbing material with a structure imitating a wedge. This sound-absorbing material is light, thin, soft, has a wide sound-absorbing frequency band, and a high noise reduction efficiency. The preparation method is simple, has good economic benefits, and is suitable for industrial production.

Description

Technical Field

[0001] The present invention belongs to the field of sound-absorbing materials and their preparation, and particularly relates to a fabric / corncob flexible sound-absorbing material with a structure imitating a pyramidal absorber and a preparation method thereof. Background Art

[0002] Fiber materials have characteristics such as softness, porosity, high strength, and low cost, and have excellent mid- and high-frequency sound-absorbing performance, and are widely used in the field of sound absorption and noise reduction. However, due to the principle of porous sound absorption, at low frequencies, the lower sound wave vibration frequency makes the air viscous effect and heat conduction effect in the internal pores of the material weaker, and the sound wave attenuation is weaker, resulting in weak low-frequency sound absorption, which limits the development of fiber materials in the field of sound absorption and noise reduction. Agricultural waste corncob has a rough surface, is biodegradable, lightweight, has good toughness, good wear resistance, and low cost, and is applied to fields such as reinforcement, heat insulation, adsorption, and filtration, and has great potential for application in sound absorption and noise reduction. The sound-absorbing pyramidal absorber structure is commonly used in anechoic chambers. Its cross-sectional area gradually increases from the tip to the bottom, making the acoustic impedance gradient increase along the sound wave incident direction, gradually attenuating the incident sound wave, and achieving excellent low-frequency sound absorption effect. However, most of the sound-absorbing pyramidal absorbers are metal frame structures, and it is difficult to adjust the structure.

[0003] Based on the sound-absorbing pyramidal absorber structure, combining the characteristics of the fabric such as light weight, flexibility, porosity, and diverse structure design, and the surface roughness, light weight, and biodegradability of agricultural waste corncob, a pyramidal absorber structure is constructed on the fabric surface, and corncob powder is filled inside the pyramidal absorber to improve the low-frequency sound absorption performance of the fabric sound-absorbing material. Mix the agricultural waste corncob powder and PE powder and evenly sprinkle them on the fabric surface, and obtain the fabric / corncob material through high-temperature treatment. Perform adhesive surface treatment and pyramidal shaping on the fabric / corncob material to obtain a pyramidal fabric / corncob material. Then, place multiple pyramidal fabric / corncob materials on the surface of a suede fabric, and use an adhesive to adhere the fluff to the surface of the pyramidal fabric / corncob material, and thus obtain a fabric / corncob flexible sound-absorbing material with a structure imitating a pyramidal absorber. Therefore, the present invention develops a fabric / corncob flexible sound-absorbing material with a structure imitating a pyramidal absorber. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a fabric / corncob flexible sound-absorbing material with a structure imitating a wedge and a preparation method thereof. The sound-absorbing material prepared by this method has the characteristics of a sound-absorbing wedge structure, flexible fiber porosity, and agricultural waste. Its sound-absorbing performance is excellent, and the average sound-absorbing coefficient (including an 8-cm air back cavity) in the frequency range of 250 - 1800 Hz is 0.689, and the maximum sound-absorbing coefficient can reach 0.910. The sound-absorbing material prepared by the present invention has a wide absorption frequency band, and the sound-absorbing coefficient (including an 8-cm air back cavity) in the frequency range of 250 - 1800 Hz is greater than 0.3. The sound-absorbing material prepared by the present invention is light, thin, soft, has a wide sound-absorbing frequency band, high noise reduction efficiency, a simple preparation method, good economic benefits, and is suitable for industrial production.

[0005] A fabric / corncob flexible sound-absorbing material with a structure imitating a wedge according to the present invention, the sound-absorbing material is composed of a suede fabric and a wedge-shaped fabric / corncob material. The wedge-shaped fabric / corncob material is obtained by mixing agricultural waste corncob powder and PE powder, evenly spreading them on the fabric surface, and then using high-temperature treatment. Multiple wedge-shaped fabric / corncob materials are arranged at intervals on the surface of the suede fabric, and the fluff is respectively pasted on the surface of the wedge-shaped fabric / corncob material. The suede fabric is a woven fabric, knitted fabric, or non-woven fabric, obtained by cutting the pile or electrostatic flocking. The wedge-shaped fabric is obtained by coating an adhesive on the surface of a woven fabric, knitted fabric, or non-woven fabric and forming a wedge shape. The wedge-shaped forming means using an adhesive to fix the fabric into a wedge shape with an isosceles triangle or right triangle cross-section and a hollow interior. The adhesive is nano glue or starch slurry. The length of the surface fluff of the suede fabric is 1 - 5 cm, the interval of the wedge-shaped fabric / corncob material on the surface of the suede fabric is 0 - 3 cm, the particle size of the corncob powder is 0.5 - 1.0 mm, the particle size of the PE particles is 0.8 - 1.5 mm, the mixing ratio of the corncob powder to the PE powder is 1.5:1, the temperature of the high-temperature treatment is 120 - 140 °C, the time is 15 - 30 minutes, and the grammage of the sound-absorbing material is 1 - 3 kg / m 2 , and the thickness is 2 - 4 cm.

[0006] A fabric / corncob flexible sound-absorbing material with a structure imitating a wedge according to the present invention, the bottom surface of the wedge-shaped fabric / corncob material is attached to the root of the fluff of the suede fabric, and multiple wedge-shaped fabric / corncob materials are arranged in parallel.

[0007] A preparation method of a fabric / corncob flexible sound-absorbing material with a structure imitating a wedge according to the present invention includes:

[0008] (1) Mix agricultural waste corncob powder and PE powder, evenly spread them on the fabric surface, and obtain a fabric / corncob material through high-temperature treatment.

[0009] (2) Adhere an adhesive to the surface of the fabric / corncob material and fix it into a wedge shape to obtain a wedge-shaped fabric / corncob material;

[0010] (3) Place multiple wedge-shaped fabric / corncob materials in parallel and at intervals at the root of the pile of the suede fabric, and then use an adhesive to bond the fluff on the surface of the suede fabric to the surface of the wedge-shaped fabric / corncob material, thus obtaining a fabric / corncob flexible sound-absorbing material with an imitation wedge structure.

[0011] Based on the sound-absorbing wedge structure, this invention combines the light weight, flexibility, porous nature, and diverse structural designs of fabrics, and the surface roughness, light weight, and biodegradability of agricultural waste corncobs. A wedge structure is constructed on the fabric surface, and corncob powder is filled inside the wedge to improve the low-frequency sound-absorbing performance of the fabric sound-absorbing material. Mix the agricultural waste corncob powder and PE powder and evenly sprinkle them on the fabric surface, and after high-temperature treatment, obtain the fabric / corncob material. Perform adhesive surface treatment and wedge-shaped molding on the fabric / corncob material to obtain a wedge-shaped fabric / corncob material. Then place multiple wedge-shaped fabric / corncob materials on the surface of the suede fabric, and use an adhesive to bond the fluff to the surface of the wedge-shaped fabric / corncob material, thus obtaining a fabric / corncob flexible sound-absorbing material with an imitation wedge structure. Therefore, this invention has developed a fabric / corncob flexible sound-absorbing material with an imitation wedge structure.

[0012] Beneficial effects

[0013] (1) The sound-absorbing material prepared by this invention has the characteristics of a wedge structure, fiber flexibility and porosity, and agricultural waste, etc. The sound-absorbing performance of the sound-absorbing material is excellent. The average sound-absorbing coefficient (including an 8-cm air back cavity) in the frequency range of 250 - 1800 Hz is 0.689, and the maximum sound-absorbing coefficient can reach 0.910; the absorption frequency band of the sound-absorbing material prepared by this invention is relatively wide, and the sound-absorbing coefficient (including an 8-cm air back cavity) in the frequency range of 250 - 1800 Hz is greater than 0.3;

[0014] (2) The sound-absorbing material prepared by this invention is light, thin, soft, has a wide sound-absorbing frequency band, high noise reduction efficiency, a simple preparation method, good economic benefits, and is suitable for industrial production. Description of the Drawings

[0015] Figure 1 : Comparison of the sound-absorbing coefficients of the fabric / corncob flexible sound-absorbing material with an imitation wedge structure, the fabric / corncob flexible sound-absorbing material with an imitation wedge structure (including a 4-cm air back cavity), the fabric / corncob flexible sound-absorbing material with an imitation wedge structure (including an 8-cm air back cavity), the fabric sound-absorbing material with an imitation wedge structure, the suede fabric, and the plain weave fabric. Detailed Embodiments

[0016] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0017] Example 1

[0018] Mix agricultural waste corn cob powder and PE powder, and evenly sprinkle them on the surface of the fabric. After high-temperature treatment, a fabric / corn cob material is obtained. Adhere nano glue to the surface of the fabric / corn cob material and fix it into a wedge shape to obtain a wedge-shaped fabric / corn cob material; place multiple wedge-shaped fabric / corn cob materials parallel and spaced at the roots of the pile of the suede fabric, and then use an adhesive to bond the fluff on the surface of the suede fabric to the surface of the wedge-shaped fabric / corn cob material, thus obtaining a fabric / corn cob flexible sound-absorbing material with a simulated wedge structure. The length of the fluff on the surface of the suede fabric is 3 cm, the spacing of the wedge-shaped fabric / corn cob material on the surface of the suede fabric is 2.3 cm, the average particle size of the corn cob powder is 0.8 mm, the particle size of the PE particles is 1.0 mm, the mixing ratio of the corn cob powder to the PE powder is 1.5:1, the temperature of the high-temperature treatment is 30 °C, the time is 20 minutes, and the gram weight of the sound-absorbing material is 2.0 kg / m 2 , and the thickness is 2.9 cm.

[0019] Comparative Example 1

[0020] Adhere nano glue to the surface of the fabric and fix it into a wedge shape to obtain a wedge-shaped fabric. Place multiple wedge-shaped fabrics parallel and spaced at the roots of the pile of the suede fabric, and then use nano glue to bond the fluff on the surface of the suede fabric to the surface of the wedge-shaped fabric, thus obtaining a fabric sound-absorbing material with a simulated wedge structure. The length of the fluff on the surface of the suede fabric is 3 cm, the spacing of the wedge-shaped fabric / corn cob material on the surface of the suede fabric is 2.3 cm, and the gram weight of the sound-absorbing material is 1.4 kg / m 2 , and the thickness is 3 cm.

[0021] Comparative Example 2

[0022] For the hollow polyester yarn, through processes such as tissue design, warping, drawing-in, shedding, weft insertion, beating-up, coiling, and warp let-off, a hollow polyester fabric is obtained. Then, use an electrostatic flocking device to vertically flock hollow polyester staple fibers on the surface of the fabric to obtain a suede fabric. The length of the fluff on the surface of the fabric is 3 cm, and the gram weight of the fabric is 0.7 kg / m 2 , and the thickness is 3.3 cm.

[0023] Comparative Example 3

[0024] The hollow polyester yarn is processed through processes of fabric design, warping, denting, shedding, weft insertion, beating-up, coiling and warp let-off to obtain a hollow polyester plain fabric. The grammage of the fabric is 0.3 kg / m 2 , and the thickness is 0.068 cm.

[0025] Compared with the ordinary plain fabric, the flannelette fabric has a wider sound absorption frequency band and a higher sound absorption coefficient, indicating that the flocking on the fabric surface helps to improve its sound absorption performance; compared with the ordinary plain fabric and the flannelette fabric, in the frequency range of 100 - 1800 Hz, the sound absorption coefficient of the fabric with a structure imitating a wedge is higher, indicating that the structure imitating a wedge is beneficial to improving the low-frequency sound absorption performance of the fabric material. At the same time, the fabric / corncob material with a structure imitating a wedge has a higher sound absorption coefficient than the fabric material with a structure imitating a wedge, indicating that filling the wedge structure with corncobs helps to further improve the low-frequency sound absorption performance of the material; increasing the air cavity thickness after adding the material can further increase the sound absorption bandwidth and sound absorption coefficient of the material.

Claims

1. Preparation method of fabric / corn cob flexible sound-absorbing material imitating wedge structure, characterized in that: The sound-absorbing material is composed of a suede fabric and a wedge-shaped fabric / corncob material. Agricultural waste corncob powder and PE powder are mixed and evenly scattered on the fabric surface, and then the fabric / corncob material is obtained by high-temperature treatment. An adhesive is coated on the surface of the fabric / corncob material to fix the fabric / corncob material into a wedge shape with an isosceles triangle or right triangle cross-section and a hollow interior, obtaining the wedge-shaped fabric / corncob material. Multiple wedge-shaped fabric / corncob materials are arranged at intervals on the surface of the suede fabric, and fluff is pasted on the surface of the wedge-shaped fabric / corncob material to obtain the fabric / corncob flexible sound-absorbing material with a pseudo-wedge structure. The suede fabric is a woven fabric, a knitted fabric or a non-woven fabric, and is obtained by shearing or electrostatic flocking. The fabric in the wedge-shaped fabric / corncob material is a woven fabric, a knitted fabric or a non-woven fabric. The adhesive is nano glue or starch slurry. The length of the surface fluff of the suede fabric is 1 to 5 cm, the interval of the wedge-shaped fabric / corncob material on the surface of the suede fabric is 0 to 3 cm, the particle size of the corncob powder is 0.5 to 1.0 mm, the particle size of the PE particles is 0.8 to 1.5 mm, the mixing ratio of the corncob powder to the PE powder is 1.5:1, the temperature of the high-temperature treatment is 120 to 140 °C, the time is 15 to 30 minutes, and the gram weight of the sound-absorbing material is 1 to 3 kg / m 2 , and the thickness is 2 to 4 cm.

2. The preparation method of fabric / corn cob flexible sound-absorbing material imitating wedge structure according to claim 1, characterized in that: The bottom surface of the wedge-shaped fabric / corn cob material is attached to the root of the pile of the suede fabric, and multiple wedge-shaped fabric / corn cob materials are arranged in parallel.

3. The fabric / corn cob flexible sound-absorbing material imitating wedge structure prepared by the preparation method of fabric / corn cob flexible sound-absorbing material imitating wedge structure according to claim 1.

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