阅读说明：本技术 用于降低轮胎空腔共鸣音的橡胶组合物及制备、应用方法 (Rubber composition for reducing tire cavity resonance sound and preparation and application methods thereof ) 是由 张智超 陈玲 卢荣丽 张胜强 甄素霞 于 2021-09-07 设计创作，主要内容包括：本发明涉及轮胎领域,公开了一种用于降低轮胎空腔共鸣音的橡胶组合物及制备、应用方法,橡胶组合物按重量份数包括：二烯类橡胶100份,填充剂10～30份,增塑剂2～8份,氧化锌1～5份,硬脂酸1～3份,防老剂2～6份,化学发泡剂10～30份,硫磺1～3份,促进剂0.5～1.5份；其中,所述二烯类橡胶选用天然橡胶、聚异戊二烯、丁二烯橡胶、丁二烯/苯乙烯共聚物中的至少一种。该橡胶组合物与轮胎其他部件一起经历硫化过程之后形成多孔且孔洞之间互相贯穿的低密度材料,在保证轮胎滚动阻力不提升的前提下,降低了空腔共鸣音；橡胶组合物没有使用传统轮胎气密层中使用的丁基橡胶或卤化丁基橡胶,降低了生产成本。(The invention relates to the field of tires, and discloses a rubber composition for reducing tire cavity resonance sound and preparation and application methods thereof, wherein the rubber composition comprises the following components in parts by weight: 100 parts of diene rubber, 10-30 parts of filler, 2-8 parts of plasticizer, 1-5 parts of zinc oxide, 1-3 parts of stearic acid, 2-6 parts of anti-aging agent, 10-30 parts of chemical foaming agent, 1-3 parts of sulfur and 0.5-1.5 parts of accelerator; wherein the diene rubber is at least one of natural rubber, polyisoprene, butadiene rubber and butadiene/styrene copolymer. The rubber composition and other parts of the tire form a porous low-density material with mutually penetrating holes after undergoing a vulcanization process, so that the cavity resonance sound is reduced on the premise of ensuring that the rolling resistance of the tire is not improved; the rubber composition does not use butyl rubber or halogenated butyl rubber used in the traditional tire inner liner, thereby reducing the production cost.)

1. A rubber composition for reducing tire cavity resonance is characterized by comprising the following components in parts by weight: 100 parts of diene rubber, 10-30 parts of filler, 2-8 parts of plasticizer, 1-5 parts of zinc oxide, 1-3 parts of stearic acid, 2-6 parts of anti-aging agent, 10-30 parts of chemical foaming agent, 1-3 parts of sulfur and 0.5-1.5 parts of accelerator; wherein the diene rubber is at least one of natural rubber, polyisoprene, butadiene rubber and butadiene/styrene copolymer; the diene rubber is a combined system of natural rubber and butadiene rubber, wherein the combined weight ratio of the natural rubber to the butadiene rubber is as follows: butadiene rubber 3: 7-7: 3, or a salt thereof.

2. The rubber composition for reducing tire cavity resonance noise according to claim 1, wherein: the filler is at least one of carbon black, white carbon black, argil and calcium carbonate.

3. The rubber composition for reducing tire cavity resonance noise according to claim 1, wherein: the plasticizer is at least one of environment-friendly aromatic oil, naphthenic oil and plant-based oil.

4. The rubber composition for reducing tire cavity resonance noise according to claim 1, wherein: the anti-aging agent is selected from at least one of anti-aging agent RD, anti-aging agent 4010NA, anti-aging agent DTPD and anti-aging agent 6 PPD.

5. The rubber composition for reducing tire cavity resonance noise according to claim 1, wherein: the chemical foaming agent is at least one selected from azodicarbonamide, N '-dinitrosopentamethylenetetramine and 4, 4' -oxybis-benzenesulfonylhydrazide.

6. The rubber composition for reducing tire cavity resonance noise according to claim 1, wherein: the accelerator is selected from at least one of sulfenamides and thiurams; the sulfenamide comprises at least one of N-cyclohexyl-2-benzothiazole sulfenamide, N-tertiary butyl-2-benzothiazole sulfenamide, 2- (4-morpholinothio) benzothiazole and N, N-dicyclohexyl-2-benzothiazole sulfenamide; the thiuram includes at least one of tetrabenzylthiuram disulfide and bis-disulfide.

7. A method for preparing the rubber composition for reducing tire cavity resonance noise according to any one of claims 1 to 6, comprising the steps of:

(1) putting diene rubber, a filler, zinc oxide, stearic acid and an anti-aging agent into an internal mixer, controlling the rotating speed to be 20-60 rpm, mixing for 1-2 min, adding a plasticizer when the temperature rises to 120-130 ℃, continuously mixing until the mixing temperature reaches 155 ℃ for rubber discharge to obtain M1-section masterbatch, and cooling for later use;

(2) and adding the cooled M1-section master batch, sulfur, an accelerator and a chemical foaming agent into an internal mixer at the rotating speed of 15-30 rpm, mixing until the temperature reaches 100 ℃, discharging rubber, and cooling to obtain the rubber composition.

8. A method of using a rubber composition for reducing tire cavity resonance, characterized by: placing the rubber composition according to any one of claims 1 to 6 in an inner liner of a tire during tire formation, and then subjecting the tire to low-temperature vulcanization at 160 ℃; the rubber composition is formed into uniform through holes with porosity of more than 50% while ensuring that the vulcanization of the tire is completed except for the other parts of the rubber composition.

9. The method of using a rubber composition for reducing tire cavity resonance as in claim 8, wherein: the porosity of the uniform through holes is 50% -80%.

Technical Field

The invention relates to the field of tires, in particular to a rubber composition for reducing tire cavity resonance sound and preparation and application methods thereof.

Background

When an automobile runs on a road surface, the tire generates vibrations of different frequencies along with the unevenness of the road surface, and these vibrations cause the air inside the tire cavity to vibrate, thereby generating cavity resonance sound. Generally, the cavity resonance sound has a sharp resonance peak between 150 Hz and 250Hz, which brings unpleasant feeling to passengers in the vehicle. Therefore, the reduction and control of the noise in this frequency band are important aspects of reducing the driving noise of the automobile and improving the driving comfort.

In the prior art, in order to effectively reduce tire cavity resonance, a porous material with sound absorption performance is arranged inside a tire, but after the tire is molded and vulcanized, noise reduction materials such as silence sponge and foam are attached to the inner scheme of the tire in an adhesion mode, so that the complexity of the tire production process is improved, and in the running process of the tire, the silence sponge and the foam have the risk of falling off.

Disclosure of Invention

In order to solve the technical problems, the invention provides a rubber composition for reducing tire cavity resonance sound and preparation and application methods thereof.

In order to solve the technical problems, the invention adopts the following technical scheme:

a rubber composition for reducing tire cavity resonance comprises the following components in parts by weight: 100 parts of diene rubber, 10-30 parts of filler, 2-8 parts of plasticizer, 1-5 parts of zinc oxide, 1-3 parts of stearic acid, 2-6 parts of anti-aging agent, 10-30 parts of chemical foaming agent, 1-3 parts of sulfur and 0.5-1.5 parts of accelerator; wherein the diene rubber is at least one of natural rubber, polyisoprene, butadiene rubber and butadiene/styrene copolymer; the diene rubber is a combined system of natural rubber and butadiene rubber, wherein the combined weight ratio of the natural rubber to the butadiene rubber is as follows: butadiene rubber 3: 7-7: 3, or a salt thereof.

Furthermore, the filling agent is at least one of carbon black, white carbon black, argil and calcium carbonate; preferably, carbon black or white carbon is used as the filler, and carbon black is used as the more preferred filler.

Further, the plasticizer is at least one of environment-friendly aromatic oil, naphthenic oil and plant-based oil; preferably, the plasticizer uses an environmentally friendly aromatic oil.

The anti-aging agent is at least one selected from anti-aging agent RD, anti-aging agent 4010NA, anti-aging agent DTPD and anti-aging agent 6 PPD.

Further, the chemical foaming agent is selected from at least one of azodicarbonamide, N '-dinitrosopentamethylenetetramine and 4, 4' -oxybis-benzenesulfonylhydrazide; preferably, 4' -oxybis-benzenesulfonylhydrazide is used as the chemical foaming agent.

Further, the accelerator is selected from at least one of sulfenamides and thiurams; the sulfenamide comprises at least one of N-cyclohexyl-2-benzothiazole sulfenamide, N-tertiary butyl-2-benzothiazole sulfenamide, 2- (4-morpholinothio) benzothiazole and N, N-dicyclohexyl-2-benzothiazole sulfenamide; the thiuram includes at least one of tetrabenzylthiuram disulfide and bis-disulfide; preferably, thiurams use sulfenamide accelerators.

A preparation method of a rubber composition for reducing tire cavity resonance sound comprises the following steps:

(1) putting diene rubber, a filler, zinc oxide, stearic acid and an anti-aging agent into an internal mixer, controlling the rotating speed to be 20-60 rpm, mixing for 1-2 min, adding a plasticizer when the temperature rises to 120-130 ℃, continuously mixing until the mixing temperature reaches 155 ℃ for rubber discharge to obtain M1-section masterbatch, and cooling for later use;

(2) and adding the cooled M1-section master batch, sulfur, an accelerator and a chemical foaming agent into an internal mixer at the rotating speed of 15-30 rpm, mixing until the temperature reaches 100 ℃, discharging rubber, and cooling to obtain the rubber composition.

A method for using the rubber composition for reducing the cavity resonance of the tire, the rubber composition is attached to the inner liner of the tire during the tire molding, and then the tire is vulcanized at a low temperature of 160 ℃; the rubber composition is formed into uniform through holes with porosity of more than 50% while ensuring that the vulcanization of the tire is completed except for the other parts of the rubber composition.

Further, the porosity of the uniform through holes is 50% to 80%.

Compared with the prior art, the invention has the beneficial technical effects that:

1. the rubber composition capable of reducing the cavity resonance sound has the advantages that the filler is used in a small amount, the rubber composition and other parts of the tire form a porous low-density material with mutually penetrating holes after undergoing a vulcanization process, and compared with the traditional tire, the cavity resonance sound is greatly reduced on the premise of ensuring that the rolling resistance of the tire is not improved.

2. The rubber composition component for reducing cavity resonance used in the present invention does not use butyl rubber or halogenated butyl rubber used in conventional tire inner liners, thereby reducing production costs.

Detailed Description

The preferred embodiments of the present invention will be described in detail below.

Comparative example 1

The rubber composition comprises the following components in parts by weight: 20 parts of natural rubber, 80 parts of butadiene rubber, 20 parts of filler, 6 parts of plasticizer, 4 parts of zinc oxide, 2 parts of stearic acid, 3 parts of anti-aging agent, 0 part of chemical foaming agent, 2 parts of sulfur and 1 part of accelerator.

Comparative example 2

The rubber composition comprises the following components in parts by weight: 80 parts of natural rubber, 20 parts of butadiene rubber, 8 parts of filler, 10 parts of plasticizer, 4 parts of zinc oxide, 2 parts of stearic acid, 3 parts of anti-aging agent, 32 parts of chemical foaming agent, 2 parts of sulfur and 1 part of accelerator.

Comparative example 3

The rubber composition comprises the following components in parts by weight: 40 parts of natural rubber, 60 parts of butadiene rubber, 32 parts of filler, 6 parts of plasticizer, 4 parts of zinc oxide, 2 parts of stearic acid, 3 parts of anti-aging agent, 5 parts of chemical foaming agent, 2 parts of sulfur and 1 part of accelerator.

Comparative example 4

The rubber composition comprises the following components in parts by weight: 40 parts of natural rubber, 60 parts of butadiene rubber, 20 parts of filler, 6 parts of plasticizer, 4 parts of zinc oxide, 2 parts of stearic acid, 3 parts of anti-aging agent, 11 parts of chemical foaming agent, 5 parts of sulfur and 2 parts of accelerator.

Example 1

The rubber composition comprises the following components in parts by weight: 50 parts of natural rubber, 50 parts of butadiene rubber, 12 parts of filler, 3 parts of plasticizer, 4 parts of zinc oxide, 2 parts of stearic acid, 3 parts of anti-aging agent, 18 parts of chemical foaming agent, 2 parts of sulfur and 1 part of accelerator.

Example 2

The rubber composition comprises the following components in parts by weight: 35 parts of natural rubber, 65 parts of butadiene rubber, 15 parts of filler, 5 parts of plasticizer, 3 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of anti-aging agent, 20 parts of chemical foaming agent, 1.8 parts of sulfur and 1.2 parts of accelerator.

Example 3

The rubber composition comprises the following components in parts by weight: 65 parts of natural rubber, 35 parts of butadiene rubber, 20 parts of filler, 5 parts of plasticizer, 3 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of anti-aging agent, 28 parts of chemical foaming agent, 1.8 parts of sulfur and 1.2 parts of accelerator.

Example 4

The rubber composition comprises the following components in parts by weight: 30 parts of natural rubber, 70 parts of butadiene rubber, 28 parts of filler, 5 parts of plasticizer, 3 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of anti-aging agent, 23 parts of chemical foaming agent, 2 parts of sulfur and 1.2 parts of accelerator.

Example 5

The rubber composition comprises the following components in parts by weight: 50 parts of natural rubber, 50 parts of butadiene rubber, 25 parts of filler, 7 parts of plasticizer, 3 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of anti-aging agent, 30 parts of chemical foaming agent, 2.2 parts of sulfur and 1.2 parts of accelerator.

The above examples and comparative examples are combined in Table 1.

TABLE 1

Wherein the natural rubber is selected from SMR 20# standard rubber; butadiene rubber: NiBR from the medium petrochemicals company; filling agent: carbon black N660, from Cabot Chemical co.ltd.; plasticizer: an environment-friendly aromatic oil TDAE from Ningbo Han Sheng chemical Co., Ltd; zinc oxide: is sold on the market; stearic acid: is sold on the market; an anti-aging agent: anti-aging agent 4020, N- (1, 3-dimethyl) butyl-N' -phenyl-p-phenylenediamine, commercially available; chemical foaming agent: foaming agents OBSH, P, P' -OXYBIS Benzene SULFONYL HYDRAZIDE, commercially available; sulfur: ordinary sulfur, commercially available; accelerator (b): accelerator NS (N-tert-butyl-2-benzothiazoleinosine amide), commercially available.

The above comparative examples and examples were prepared according to the following procedures:

(1) putting diene rubber, a filler, zinc oxide, stearic acid and an anti-aging agent into an internal mixer, controlling the rotating speed to be 20-60 rpm, mixing for 1-2 min, adding a plasticizer when the temperature rises to 120-130 ℃, continuously mixing until the mixing temperature reaches 155 ℃ for rubber discharge to obtain M1-section masterbatch, and cooling for later use.

(2) And adding the cooled M1-section master batch, sulfur, an accelerator and a chemical foaming agent into an internal mixer at the rotating speed of 15-30 rpm, mixing until the temperature reaches 100 ℃, discharging rubber, and cooling to obtain the rubber composition corresponding to each proportion and embodiment.

The manufacturing process for applying the rubber composition to a tire is as follows:

size of rubber composition: the width is more than 0.5W1B and less than W2B; the length is the circumference of the forming drum during forming; the thickness is 3 mm. Where W1B is the first belt width and W2B is the second belt width.

The differences in the production of the different sized rubber compositions are shown in table 2.

TABLE 2

It was found through experiments that the larger the width of the rubber composition, the better the cavity resonance noise performance, but when the width is larger than 2B generation belt width, the edge of the rubber composition enters into the flexing zone of the tire after the tire is vulcanized, the rubber composition in the flexing zone part can fall off during the running of the tire, so that the width of the rubber composition is larger than 0.5W1B and smaller than W2B.

Manually applying the rubber composition to a forming drum of a one-shot machine, or automatically applying the rubber composition to the forming drum by adding a supply stand to the forming machine; and then, according to the normal forming process on site, the composition of the inner liner and the tire side is attached, the cord fabric is attached, and inflation turn-up pressing is carried out, so that the rubber composition can be well attached to the inner liner in the tire blank.

And (3) a vulcanization process: and a low-temperature vulcanization process is adopted during vulcanization. The rubber composition is vulcanized at low temperature, so that the porosity of the rubber composition after vulcanization can be increased; in each of the above comparative examples and examples, a low temperature vulcanization process of 160 ℃ was used, the temperature depending on the optimum temperature for vulcanization of the rubber composition, but it was necessary to ensure that the tire could be completely vulcanized. The excessive temperature can cause scorching of the rubber compound and reduce the porosity of the foamed rubber.

The effect of different curing processes on tire cavity resonance noise performance is shown in table 3.

TABLE 3

(4) Tire grinding: after the rubber composition is vulcanized along with the tire, the surface skin of the rubber composition needs to be polished to expose air holes; the method comprises the following steps: the grinding wheel is adopted for manual grinding, and the air gun is needed for cleaning the tire after grinding is finished, so that the time consumption is long; the method 2 comprises the following steps: the blade cutting device polishes and sucks sundries away at the same time.

Testing of the tires: after the tire is manufactured, a flat rubber sheet is cut from the vulcanized rubber composition in the tire, then the appearance of air holes in the rubber is observed by using an optical microscope or a scanning electron microscope, and the air hole rate is obtained by calculating the percentage of the area of the air holes in the total area. The test results are shown in Table 4.

Table 4 the tire cavity resonance noise performance was subjected to the in-vehicle test and the results are listed in table 5.

TABLE 5

The rubber composition in each example of table 1 can reach a porosity of at least 50% according to the tire manufacturing mode of table 2, and pores penetrate through each other, so that absorption of sound waves is facilitated, and the technical effect of greatly reducing cavity resonance sound is achieved; the problem of process complexity of additionally attaching a noise reduction device after tire vulcanization in the industry and the problem that the attachment of the noise reduction device is not durable and stable possibly are solved, the process complexity is reduced, and the durable noise reduction effect is guaranteed.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.