Composition for reducing noise of wheel and noise-reducing wheel

Abstract

The invention relates to a composition for reducing noise of a wheel and the noise-reducing wheel. The composition for reducing noise of the wheels comprises 100 parts of combined polyether PHR, 15 to 28 parts of foaming agent PHR, 130 to 160 parts of polyisocyanate PHR, 10 to 30 parts of surfactant PHR, 20 to 80 parts of foam stabilizer PHR, 40 to 80 parts of viscosity modifier PHR, 1 to 8 parts of Ca (OH) 2 PHR or 5 to 15 parts of Na2CO3 PHR, 90 to 100 parts of deionized water PHR and 2 to 4 parts of silane coupling agent PHR. According to the composition for reducing noise of the wheel, the noise reduction effect of the wheel in a cavity frequency band can reach 8-12dB.

Description

Technical Field

[0001] The present application relates to a composition for reducing the noise of a wheel and a noise-reducing wheel. Background Art

[0002] The road noise of new energy vehicles is often the most complained by consumers, mainly manifested in poor road noise, ear-squeezing sound, cavity "rumbling" sound, high-frequency whistling noise, etc. During the driving process, a certain amount of gas needs to be injected into the tire to make the tire have load stiffness to ensure driving safety. After the tire and rim are assembled, a certain amount of gas is filled from the valve mouth, so that the tire has the ability to bear the weight of the vehicle body. And it is these gases that perform irregular Brownian motion in the inner wall of the tire cavity, thus forming the special cavity rumbling sound.

[0003] The ways to solve wheel cavity noise in the industry are as follows: 1) Adding silent cotton to the tire and utilizing the porous sound absorption effect of the silent cotton to reduce the cavity sound; 2) Using a multi-cavity aluminum alloy design in the rim, generally with 4-5 cavities around the circumference, to disrupt the cavity frequency and reduce cavity noise; 3) Using a Helmtz muffler on the rim to actively transmit the frequency to superimpose the sound of the cavity frequency band in peak-valley mode to reduce the overall cavity noise. Summary of the invention

[0004] One aspect of the present application provides a composition for reducing wheel noise.

[0005] The wheel noise reduction composition provided in the present application comprises: Combined polyether PHR: 100; Foaming agent PHR: 15-28; Polyisocyanate PHR: 130-160; Surfactant PHR: 10-30; Foam stabilizer PHR: 20-80; Viscosity regulator PHR: 40-80; Ca(OH) 2 PHR: 1-8 or Na 2 CO 3 PHR: 5-15; Deionized water PHR: 90-100; Silane coupling agent PHR: 2-4.

[0006] In one embodiment, the foaming agent is a mixture of water and polytetrahydrofuran diol, wherein the water accounts for 0.5wt%-3wt% and the polytetrahydrofuran diol accounts for 97wt%-99.5wt%.

[0007] In one embodiment, the polyisocyanate includes any one or more of toluene diisocyanate (TDI) and diphenylmethane diisocyanate (MDI).

[0008] In one embodiment, the surfactant is an amphoteric surfactant.

[0009] In one embodiment, the foam stabilizer is an MPS foam stabilizer.

[0010] MPS foam stabilizer is mainly silicone resin polyether microemulsion FM-70, with a polyether content of 40% and a solid content of 70%.

[0011] In one embodiment, the viscosity modifier is Tac-Oil P.

[0012] Tac-Oil P is a high-efficiency polyisobutylene concentrate sold by Shin TAC Chemicals Co., Ltd. that improves film thickness and increases adhesion to surfaces.

[0013] In one embodiment, the silane coupling agent is silane coupling agent Si69 or tetramethylsilane.

[0014] Another aspect of the present application provides a high-pressure gas cylinder for wheel noise reduction.

[0015] The high-pressure gas cylinder provided by the present application contains the composition.

[0016] Yet another aspect of the present application provides a noise reduction wheel.

[0017] The noise reduction wheel provided in the present application contains suspended particle foam between its tire and rim, and the suspended particle foam is formed by foaming the composition.

[0018] In one embodiment, the suspended particle foam density is 0.5-0.7 g / cm 3 .

[0019] According to tests, the composition used for wheel noise reduction can achieve a noise reduction effect of 8-12dB in the cavity frequency band (200-250HZ) for wheels, whether in the front or rear seats of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A picture showing a common consumer using the high-pressure gas cylinder for wheel noise reduction of the present application; Figure 2 The suspended particle foam formed in the cavity of the noise reduction wheel of the present application is shown; Figure 3 The test results of tire noise at the front driver's seat on different road surfaces under real vehicle testing are shown; Figure 4The test results of tire noise at the rear passenger position on different road surfaces under actual vehicle testing are shown. DETAILED DESCRIPTION

[0021] Here, the technical solutions in the embodiments (or "implementation methods") of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0022] One aspect of the present application provides a composition for reducing wheel noise.

[0023] The wheel noise reduction composition provided in the present application comprises: Combined polyether PHR: 100; Foaming agent PHR: 15-28; Polyisocyanate PHR: 130-160; Surfactant PHR: 10-30; Foam stabilizer PHR: 20-80; Viscosity regulator PHR: 40-80; Ca(OH) 2 PHR: 1-8 or Na 2 CO 3 PHR: 5-15; Deionized water PHR: 90-100; Silane coupling agent PHR: 2-4.

[0024] PHR stands for "parts per hundred of rubber (or resin)", which is the number of parts added per 100 parts (by mass) of rubber or resin, and is a unit that describes the content of fillers or additives in composite materials.

[0025] Another aspect of the present application provides a high-pressure gas cylinder for wheel noise reduction, wherein the high-pressure gas cylinder contains the composition.

[0026] Another aspect of the present application provides a noise reduction wheel, which contains suspended particle foam between the tire and the rim, wherein the suspended particle foam is foamed from the composition.

[0027] The present invention uses a special suspended particle technology to fill the wheel noise reduction composition of the present invention into the tire and rim after assembly, so that suspended particle foam (such as Figure 2 As shown), the air molecules are then adsorbed to a certain extent, the frequency of irregular Brownian motion is reduced, thereby reducing the collision of air molecules and reducing cavity noise.

[0028] One of the advantages of the wheel noise reduction composition of the present application is that it is easy to operate. The industry's best technology is to paste the silent cotton into the tire, which requires special glue and special silent sponge. The silent cotton is implanted into the tire through a special tooling process. Only qualified tire companies can operate it. The wheel noise reduction composition of the present application can be injected into the wheel assembly (such as Figure 1 As shown), ordinary consumers can operate it.

[0029] The noise reduction composition of the present application generates a large amount of foam instantly after being injected into the tire, and the foam stabilizer stably maintains and prolongs the foaming state during the driving of the vehicle. The spatial pores in the tire are composed of bubbles generated inside. The size and spatial distribution of the spatial pores determine the noise absorption and other properties of the combined noise reduction material after foaming. The smaller the pores, the better the noise reduction effect. The pores formed by the noise reduction composition of the present application are less than 10 microns, which makes the noise reduction composition of the present application have excellent noise absorption ability.

[0030] Embodiment 1, The following components were mixed to prepare a composition for reducing wheel noise.

[0031] Combined polyether PHR: 100; Blowing agent PHR: 15, wherein the blowing agent is a mixture of water and polytetrahydrofuran diol, water accounts for 0.5wt% and polytetrahydrofuran diol accounts for 99.5wt%; 2,4-TDI PHR: 130; Dodecyl dimethyl betaine PHR: 10; MPS foam stabilizer PHR: 20; Tac-Oil P PHR: 40; Ca(OH) 2 PHR: 1; Deionized water PHR: 90; Silane coupling agent Si69 PHR: 2.

[0032] Embodiment 2, The following components were mixed to prepare a composition for reducing wheel noise.

[0033] Combined polyether PHR: 100; Blowing agent PHR: 28, wherein the blowing agent is a mixture of water and polytetrahydrofuran diol, water accounts for 3wt%, and polytetrahydrofuran diol accounts for 97wt%; 2,6-TDI PHR: 160; 2-Lauryl-N-carboxymethyl-N-hydroxyethyl imidazoline PHR: 30; MPS foam stabilizer PHR: 80; Tac-Oil P PHR: 80; Na 2 CO 3 PHR: 5; Deionized water PHR: 100; Silane coupling agent Si69 PHR: 4.

[0034] Embodiment 3, The following components were mixed to prepare a composition for reducing wheel noise.

[0035] Combined polyether PHR: 100; Blowing agent PHR: 20, wherein the blowing agent is a mixture of water and polytetrahydrofuran diol, water accounts for 3wt%, and polytetrahydrofuran diol accounts for 97wt%; Diphenylmethane diisocyanate PHR: 150; Cocamidopropyl Betaine PHR: 20; MPS foam stabilizer PHR: 50; Tac-Oil P PHR: 60; Ca(OH) 2 PHR: 5; Deionized water PHR: 100; Tetramethylsilane PHR: 3.

[0036] Embodiment 4, The following components were mixed to prepare a composition for reducing wheel noise.

[0037] Combined polyether PHR: 100; Blowing agent PHR: 25, wherein the blowing agent is a mixture of water and polytetrahydrofuran diol, water accounts for 3wt%, and polytetrahydrofuran diol accounts for 97wt%; 2,4-TDI PHR: 140; Dodecyl dimethyl betaine PHR: 25; MPS foam stabilizer PHR: 60; Tac-Oil P PHR: 70; Na 2 CO 3 PHR: 15; Deionized water PHR: 90; Silane coupling agent Si69 PHR: 3.

[0038] High pressure gas cylinder The composition of Examples 1 to 4 is pressed into a high-pressure gas cylinder by a tooling device using the principle of air pressure difference. The tank valve is an inner and outer double valve structure. When the noise reduction composition is stopped, the tooling moves up, and the valve is closed from the inside to the outside to form a sealed state.

[0039] Tire noise test Generally speaking, when the vehicle speed exceeds 60km / h, tire noise will become one of the main noise sources of the vehicle. The reason for this is that the closed cavity gas inside the tire is excited by the road surface to produce resonance of a specific frequency. This resonance is transmitted to the vehicle body through the axle and suspension system, forming a low-frequency structure-borne noise of 200-250Hz in the vehicle, affecting the NVH characteristics of the vehicle. This application defines the noise data collected within the frequency range of 200-250Hz as tire cavity resonance noise.

[0040] In order to detect whether the composition for wheel noise reduction prepared in the present application has an effect on the tire cavity resonance noise, the following method is used: 1. Prepare a designated test vehicle, make sure the tires are intact, and prepare a sufficient number of high-pressure gas cylinders filled with wheel noise reduction composition; 2. Inject the wheel noise reduction composition in the high-pressure gas cylinder into the wheel assembly through the valve nozzle; the same amount of noise reduction composition must be injected into all four tires of the vehicle; 3. After injecting the noise reduction composition, adjust the tire pressure to the standard tire pressure value through an air pump; 4. The tire noise measurement frequency bandwidth is 200-240Hz, the frequency resolution is 1Hz, and the sensors in the car are arranged at the inner / outer ear of the driver, the inner / outer ear of the left / right passenger in the second row, and the outer ear of the front passenger. The vehicle is equipped with a GPS speedometer; 5. Test the effect of the noise reduction composition on the tire cavity noise before and after the tire is injected with the noise reduction composition on the smooth, rough and grooved roads respectively; collect the test comparison data before and after the injection of the noise reduction composition and prepare Table 1.

[0041] Table 1

[0042] like Figure 3 , Figure 4 As shown in Table 1, the tires were tested at 80 km / h on a smooth road, 80 km / h on a grooved road, 40 km / h on a rough road, and 60 km / h on a rough road. In the frequency range of 200-250 Hz, the cavity sound of the tire was reduced by 8-12 dB after the injection of the noise reduction composition, and the cavity sound was completely eliminated compared with that before the injection of the noise reduction composition.

[0043] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without causing conflicts. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A composition for wheel noise reduction, comprising: Combined polyether PHR: 100; Foaming agent PHR: 15-28; Polyisocyanate PHR: 130-160; Surfactant PHR: 10-30; Foam stabilizer PHR: 20-80; Viscosity regulator PHR: 40-80; Ca(OH)2 PHR: 1-8 or Na2CO3 PHR: 5-15; Deionized water PHR: 90-100; and Silane coupling agent PHR: 2-4.

2. The composition according to claim 1, characterized in that The foaming agent is a mixture of water and polytetrahydrofuran diol, wherein the water accounts for 0.5wt%-3wt% and the polytetrahydrofuran diol accounts for 97wt%-99.5wt%.

3. The composition according to claim 1, characterized in that The polyisocyanate includes any one or more of toluene diisocyanate (TDI) and diphenylmethane diisocyanate (MDI).

4. The composition according to claim 1, characterized in that The surfactant is an amphoteric surfactant.

5. The composition according to claim 1, characterized in that The foam stabilizer is MPS foam stabilizer.

6. The composition according to claim 1, characterized in that The viscosity modifier is Tac-Oil P.

7. The composition according to claim 1, characterized in that The silane coupling agent is silane coupling agent Si69 or tetramethylsilane.

8. A high-pressure gas cylinder for wheel noise reduction, characterized in that: The high-pressure gas cylinder contains the composition according to any one of claims 1 to 7.

9. A noise reduction wheel, characterized in that: The noise reduction wheel contains suspended particle foam between the tire and the rim, and the suspended particle foam is foamed by the composition according to any one of claims 1 to 7.

10. The noise reduction wheel according to claim 9, characterized in that: The suspended particle foam density is 0.5-0.7 g / cm 3 .

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