A process for repairing polyurethane foam acoustic material

Abstract

The present application relates to a kind of polyurethane foam acoustic material repair process, mainly solve the existing technology in the presence of polyurethane foam plastic as acoustic package material sound-absorbing layer, there will be tearing, cracking technical problem.The present application is by using a new polyurethane foam acoustic material repair process, including: (1) find the polyurethane foam acoustic material that needs to be repaired, tearing size is less than 10cm, can be repaired;(2) after the dust impurities of one side of tearing, apply a layer of two-component glue, (3) after the dust impurities of the other side of tearing, adhere to the side with glue;After standing, the technical scheme of the repaired acoustic material can be obtained, which preferably solves the problem, and can be used in the repair application of new energy electric vehicle polyurethane foam acoustic material.

Description

Technical Field

[0001] This invention relates to a repair process for polyurethane foam acoustic materials. Background Technology

[0002] With the development of new energy vehicles, motor noise has become a significant issue in automotive development. To reduce motor noise, more and more car manufacturers are adopting acoustic encapsulation, placing sound insulation pads over the motor to reduce radiated noise.

[0003] Currently, the main methods for preparing acoustic insulation pads for automotive motors include molding and foaming. Molding involves molding multiple sound insulation pads according to the motor's outline. These pads are typically single-layer felt, double-layer felt, or felt + lightweight foam, and are then attached to the motor surface using Velcro, studs, or other splicing methods. Foaming involves creating multiple sound insulation pads according to the motor's outline, and then attaching them to the motor surface using Velcro, studs, or other splicing methods.

[0004] Car interior noise affects not only passenger comfort but also the health of drivers and passengers. Acoustic packaging is a crucial component influencing the acoustic characteristics of a vehicle's interior. Utilizing acoustic packaging materials can not only reduce interior noise but also adjust the sound quality to meet comfort requirements.

[0005] Polyurethane foam is a novel type of acoustic packaging material. It possesses both the damping and sound absorption mechanisms of flexible materials and the sound absorption mechanisms of porous materials, exhibiting excellent sound absorption and insulation properties, making it a popular new type of acoustic material. As a porous acoustic material, polyurethane foam has complex micro-spaces such as bubbles and pore flow paths. When sound waves are incident on the interior of these micropores, they are subjected to the viscous resistance of the air within the micropores, friction between the foam and the pores, and vibration. The sound energy is converted into heat, thus causing the sound waves to be absorbed by the porous material.

[0006] When polyurethane foam is used as the sound-absorbing layer in acoustic packaging materials, there will be problems with tearing and cracking of the sound-absorbing layer. Summary of the Invention

[0007] The technical problem to be solved by the present invention is that when polyurethane foam is used as the sound-absorbing layer of acoustic packaging material, there is a technical problem of tearing and cracking. The present invention provides a new repair process for polyurethane foam acoustic material. The process has the advantages of simple operation, tight fit of the cracked part of the sound-absorbing layer after repair, and flatness without tearing.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a repair process for polyurethane foam acoustic materials, comprising the following steps: (1) Locate the polyurethane foam acoustic material that needs repair. Repair can be carried out when the tear size is less than 10cm. (2) After cleaning the torn side of the glue to remove dust and impurities, apply a layer of two-component adhesive. (3) After cleaning the dust and impurities from the other side of the tear, attach it to the side covered with glue; after standing, the repaired acoustic material can be obtained. The tensile shear strength of the two-component adhesive is 16~18 MPa.

[0009] In the above technical solution, preferably, the two-component adhesive is composed of component A and component B, with a weight ratio of component A to component B of 8-9:1. Component A, by weight percentage, includes: 5-10% polyether polyol, 40-60% polycaprolactone polyol, 1-2.5% dispersant, 0.5-2% defoamer, 30-50% filler, 1-2% catalyst, and 1-3% rheology modifier. Component B is isocyanate.

[0010] In the above technical solution, preferably, the polyether polyol has a functionality of 2-4 and a molecular weight of 200-8000; the polycaprolactone polyol has a functionality of 2-4 and a molecular weight of 350-5000; the dispersant is a high molecular weight copolymer; the catalyst is selected from tertiary amine catalysts; the rheology modifier is selected from modified urea oligomers; and the isocyanate is selected from polymethylene polyphenyl polyisocyanate.

[0011] In the above technical solution, preferably, the polyether polyol is selected from at least one of NJ-310, CHE-307, CHE-303 or CHE-330N; the polycaprolactone polyol is selected from at least one of 2044, 2053, 2302 or 2205; the dispersant is selected from at least one of BYK-9076, BYK-9075 or BYK-9077; the defoamer is selected from at least one of BYK-070, BYK-088, BYK-141 or BYK-A530; the catalyst is selected from at least one of triethylenediamine, dimethylethanolamine or dimethylcyclohexylamine; the rheology modifier is selected from at least one of BYK-410, BYK-411 or BYK-420; the filler is selected from at least one of silica, calcium carbonate, aluminum hydroxide, talc or melamine; and the B component is selected from one of M20S, PM200, 44V20 or MR200.

[0012] In the above technical solution, preferably, the preparation method of the two-component adhesive includes the following steps: (1) Preparation of component A: By weight percentage, mix 5-10% polyether polyol, 40-60% polycaprolactone polyol, 1-2.5% dispersant, 0.5-2% defoamer, 30-50% filler, 1-2% catalyst, and 1-3% rheology modifier in a predetermined ratio and stir for 1-1.5 hours. (2) Weigh component B: Weigh polymethyl polyphenyl polyisocyanate in a ratio of 1:8 to 9 parts by weight percentage, based on the ratio of component B to component A. (3) Pour component A and component B into the dispensing machine, adjust the appropriate parameters, control the flow rate at 5g / min to 10g / min, and apply it to the surface of the polyurethane foam acoustic material that needs to be repaired through a static mixer.

[0013] This invention provides a repair process for polyurethane foam acoustic materials. First, the sound-absorbing material that can be repaired is identified. After the material is identified as repairable, a specific two-component adhesive is applied to the repair area. This adhesive, through the synergistic effect of polyether polyol, polycaprolactone polyol, and other additives, produces an adhesive with good tensile and shear properties, as well as excellent high-temperature resistance, achieving good technical results in the repair of polyurethane foam acoustic materials. Detailed Implementation

[0014] The present invention will be further illustrated by the following embodiments, but is not limited to these embodiments.

[0015]

[0016]

Example 1

[0017] The two-component adhesive was prepared, and the product performance test results are shown in Table 3.

[0018] Examples 2 to 6 Examples 2 to 6 were carried out according to the steps of Example 1, with the only difference being the reaction raw materials and the ratio of raw materials. The product performance test results of the prepared two-component adhesive are shown in Table 3.

[0019]

[0020]

[0021]

[0022] Heat resistance test procedure: (1) Apply the well-stirred glue to the aluminum sheet sample and the foam sample respectively, with a thickness of 1-2 mm, and cure at room temperature for 7 days; (2) Heat resistance test: After the adhesive has cured, the aluminum sheet sample and the foam sample are placed in a 100℃ oven and left for 24 hours. Observe whether the adhesive layer on the aluminum sheet cracks and debonds; observe whether the adhesive between the foam blocks cracks and debonds.

[0023]

Example 7

Claims

1. A repair process for polyurethane foam acoustic materials, comprising the following steps: (1) Locate the polyurethane foam acoustic material that needs repair. Repair can be carried out when the tear size is less than 10cm. (2) After cleaning the torn side of the glue to remove dust and impurities, apply a layer of two-component adhesive. (3) After cleaning the dust and impurities from the other side of the tear, attach it to the side covered with glue; after standing, the repaired acoustic material can be obtained. The two-component adhesive has a tensile shear strength of 16-18 MPa. It consists of component A and component B, with a weight ratio of 8-9:

1. Component A, by weight percentage, comprises: 5-10% polyether polyol, 40-60% polycaprolactone polyol, 1-2.5% dispersant, 0.5-2% defoamer, 30-50% filler, 1-2% catalyst, and 1-3% rheology modifier. Component B is isocyanate. The polyether polyol has a functionality of 2-4 and a molecular weight of 200-8000. The polycaprolactone polyol has a functionality of 2-4 and a molecular weight of 350-5000. The dispersant is a high molecular weight copolymer. The catalyst is selected from tertiary amine catalysts. The rheology modifier is selected from modified urea oligomers. The isocyanate is selected from polymethylene polyphenyl isocyanate. The filler is selected from at least one of silica, calcium carbonate, aluminum hydroxide, talc, or melamine.

2. The repair process for polyurethane foam acoustic material according to claim 1, characterized in that, The polyether polyol is selected from at least one of NJ-310, CHE-307, CHE-303 or CHE-330N; the polycaprolactone polyol is selected from at least one of 2044, 2053, 2302 or 2205; the dispersant is selected from at least one of BYK-9076, BYK-9075 or BYK-9077; the defoamer is selected from at least one of BYK-070, BYK-088, BYK-141 or BYK-A530; the catalyst is selected from at least one of triethylenediamine, dimethylethanolamine or dimethylcyclohexylamine; the rheology modifier is selected from at least one of BYK-410, BYK-411 or BYK-420; and component B is selected from one of M20S, PM200, 44V20 or MR200.

3. The repair process for polyurethane foam acoustic material according to claim 1, characterized in that, The method for preparing the two-component adhesive includes the following steps: (1) Preparation of component A: By weight percentage, mix 5-10% polyether polyol, 40-60% polycaprolactone polyol, 1-2.5% dispersant, 0.5-2% defoamer, 30-50% filler, 1-2% catalyst, and 1-3% rheology modifier in a predetermined ratio and stir for 1-1.5 hours. (2) Weigh component B: Weigh polymethyl polyphenyl polyisocyanate in a ratio of 1:8 to 9 parts by weight percentage, based on the ratio of component B to component A. (3) Pour component A and component B into the dispensing machine, adjust the appropriate parameters, control the flow rate at 5g / min to 10g / min, and apply it to the surface of the polyurethane foam acoustic material that needs to be repaired through a static mixer.

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