CN116790049A - Low-odor low-heat-generation sidewall rubber composition, mixing method and tire - Google Patents

Abstract

The invention relates to the technical field of new tire materials, in particular to a low-odor and low-heat-generation sidewall rubber composition, a mixing method and a tire. A low odor, low heat generation sidewall rubber composition employs a natural rubber composite material to replace or partially replace natural rubber, the natural rubber composite material comprising a bacteriostat to act on microorganisms before decomposing non-rubber components by the microorganisms, rather than adsorbing or removing malodorous gases generated after decomposing the non-rubber components by the microorganisms, thereby radically eliminating the occurrence of deterioration, mildew and malodor phenomena of natural rubber and avoiding malodorous gases generated by tires made of natural rubber.

Description

A low-odor, low-heat-generating sidewall rubber composition, mixing method and tire

Technical field

The present invention relates to the technical field of new tire materials, and in particular to a low-odor, low-heat sidewall rubber composition, a mixing method and a tire.

Background technique

With the rapid development of the automobile industry, car companies have increasingly higher requirements for tire performance, both in terms of road holding and rolling resistance. Due to the strong desire of new energy vehicles for cruising range, new energy vehicles have increasingly higher requirements for tire rolling resistance. Therefore, only reducing the heat generation of tread rubber and sidewall rubber can no longer meet the low rolling resistance requirements of tires. In this regard, major tire companies have begun to develop low heat generation in components such as base rubber, apex rubber, and outer protective rubber.

The odor of a car spare tire mainly comes from the four components of the tread, sidewall, outer protection, and inner lining. Since the spare tire is mounted on the rim, the inner lining has less impact on the odor. Odor substances mainly come from rubber, filler oil, antioxidants and accelerators. Although odor can be optimized by optimizing environmentally friendly oils, antioxidants and accelerators, natural rubber is still the most consumed type of rubber in the tire industry due to its excellent comprehensive properties. Natural rubber mostly refers to hevea rubber. It is a solid natural elastomer material made from latex collected from Brazilian hevea trees through coagulation, dehydration, drying and other processes. It is also an important strategic material and industrial raw material. Since natural rubber is biosynthesized, it contains a small amount of non-glue components such as proteins and phospholipids; under the action of microorganisms or bacteria, the non-glue components are decomposed into small molecules with malodorous odors such as amino functional groups and sulfhydryl functional groups. Therefore, during the production, storage, and use of natural rubber, foul odors will be emitted.

A large number of scholars at home and abroad have done a lot of work in controlling the odor of natural rubber, and the existing technology has also disclosed some methods for deodorizing natural rubber. Chinese patent CN113501893A discloses an environmentally friendly natural rubber processing method. The method is to add a compound bacterial liquid of 1:1~3 of sterilizing liquid and coagulating bacterial liquid to fresh latex. After coagulation, the gel blocks are left to stand and mature. Made into natural rubber raw rubber products. This method utilizes composite bacteria to decompose non-gelatin components in fresh latex to reduce the odor during the aging process of the gel mass. Chinese patent CN102558395A discloses a biological deodorization method for natural rubber fresh latex bio-glue blocks. The method is to insert the test tube slant culture of strain C1 into clean water containing 5wt% sugar, and then culture it in a shaker at 28~35°C for 2~ The 4-day-old biological deodorant liquid is mixed into the biological coagulation liquid at a weight ratio of 1:10~1:1 to coagulate fresh latex. In this method, the use of biological deodorant liquid changes from the traditional spraying deodorization on the surface of the rubber gel block to mixing the coagulant with the fresh latex during the coagulation stage of the latex and then solidifying it together, and then evenly disperses it inside the gel block; which is equivalent to During the coagulation stage of fresh latex, a long-lasting active deodorant is added to inhibit the generation of odor from the source, so that the gelatin block will not emit odor due to the presence of active deodorant during processing, and reduce the standard The release of odor during the glue drying process. Chinese patent CN108164767A discloses an odorless natural rubber and a rubber compound thereof. The preparation method is to add modified zeolite molecular sieve dispersion to natural rubber latex, use different coagulation methods to solidify the natural rubber latex, and press Crepe the film to obtain the film. After hanging the film at room temperature for a period of time, it is granulated. After being soaked in a deodorant for a certain period of time, it is dried in a hot air drying oven to obtain odorless natural rubber. This method uses coupling agent-modified zeolite molecular sieves that have strong adsorption properties and can absorb the odor generated during rubber processing. At the same time, it uses deodorant soaking to further reduce the odor caused by protein deterioration during the maturation process of natural rubber, which can effectively Remove the odor generated during the initial processing, mastication and mixing of natural rubber.

Although the above technologies all disclose methods for preparing odorless natural rubber or deodorizing natural rubber, they can only solve the technical problem of odor generated during the production process of natural rubber, and do not involve the deterioration of natural rubber during long-term storage and use. , moldy and smelly technical problems. Therefore, how to reduce or eliminate the odor generated during the storage and use of natural rubber is the biggest problem currently faced by the natural rubber industry. Therefore, solving the odor of natural rubber can improve the odor level of the sidewall rubber, thereby reducing the odor level of the spare tire.

Contents of the invention

In order to solve the above technical problems, the object of the present invention is to provide a low-odor, low-heat-generating sidewall rubber composition, in which a natural rubber composite material is used to completely or partially replace the natural rubber. The natural rubber composite material The material includes a bacteriostatic agent, which acts on microorganisms before they decompose non-glue components, instead of adsorbing or removing the odorous gas generated after microorganisms decompose non-glue components, thereby eliminating the root cause of natural rubber deterioration, mold, and The occurrence of odor phenomenon avoids the odorous gas produced by tires made of natural rubber.

In order to achieve the above objects, the present invention adopts the following technical solutions:

A sidewall rubber composition with low odor and low heat generation, which is prepared by mixing raw materials including the following components;

Rubber A,

Rubber reinforcing filler A,

As well as appropriate amounts of antioxidants, accelerators, active agents and sulfur;

It is characterized in that the mixing raw materials of the sidewall rubber composition also include natural rubber composite materials. The natural rubber composite materials are prepared by wet mixing of raw materials including the following components based on 100 parts by weight of rubber B:

Rubber B 100 parts

Rubber reinforcing filler B 5.0-20 parts

0.05-1.0 parts of 1,3,5-s-triazine or its antibacterial derivatives;

In the sidewall rubber composition, rubber A + rubber B are 100 parts by weight, rubber B is natural rubber; rubber reinforcing filler A + rubber reinforcing filler B are 30-50 parts.

Preferably, the natural rubber composite material is prepared by wet mixing from raw materials including the following components based on 100 parts by mass of rubber B:

Rubber B 100 parts

Rubber reinforcing filler B 8.0-15 parts

0.1-0.5 parts of 1,3,5-s-triazine or its antibacterial derivatives;

Preferably, the amount of rubber reinforcing filler A + rubber reinforcing filler B is 35-45 parts.

Preferably, the natural rubber is field fresh latex or concentrated latex.

Preferably, rubber A is selected from one or more mixtures of natural rubber, butadiene rubber, styrene-butadiene rubber and polybutadiene rubber; more preferably, rubber A is selected from one or more of natural rubber and polybutadiene rubber. One or two kinds are mixed; most preferably, rubber A is polybutadiene rubber, rubber A is 40-60 parts, and rubber B is 40-60 parts.

Preferably, rubber reinforcing filler A and rubber reinforcing filler B are selected from one or more types of carbon black or white carbon black;

Preferably, the BET specific surface area of the carbon black particles is 20-160 m2/g, more preferably 40-130 m2/g, further preferably 50-120 m2/g; the average secondary particle size of the carbon black particles is preferably 0.05-3 μm. , more preferably 0.1 to 1.0 μm, further preferably 0.2 to 0.9 μm; most preferably, the carbon black is one or a mixture of N134, N220, N234, N330, N375, and N550;

Preferably, the BET specific surface area of silica is 50-250m2/g, preferably 80-210m2/g, more preferably 100-190m2/g; the average secondary particle size of silica is preferably 0.04-3 μm, more preferably 0.1 to 1 μm, more preferably 0.2 to 0.7 μm;

Most preferably, the rubber reinforcing filler A uses N550 carbon black and/or N330 carbon black, and the rubber reinforcing filler B uses N330 carbon black; preferably, N550 carbon black is 25-40 parts.

Preferably, the rubber reinforcing filler includes white carbon black, and the natural rubber composite material also includes a surfactant, and the surfactant is 0.1%-10% of the white carbon black content. The applicant found through experiments that when it contains silica, it is necessary to add surfactant to complete the compounding of the rubber reinforcing filler and the natural rubber molecular chain in the water phase, achieve co-flocculation with the latex, and be evenly dispersed in the rubber matrix. For carbon black, there is no need to add surfactant.

More preferably, the surfactant is one or both of octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, fatty acid polyoxyethylene ether, decyl methyl sulfoxide and sodium lauryl sulfate. More than one kind, preferably one or more of octylphenol polyoxyethylene ether, fatty acid polyoxyethylene ether and sodium lauryl sulfate.

Preferably, the antioxidant is 1.0-2.0 parts of antioxidant TMQ and 2.5-5.0 parts of antioxidant 6PPD, the active agent is 2.0-4.0 parts of zinc oxide and 1.0-3.0 parts of stearic acid, and the accelerator is accelerator CZ0.5 -1.0 parts, 1.5-2.5 parts of sulfur; the rubber composition also includes 3.0-5.0 parts of V700 environmentally friendly oil, and 1.0-3.0 parts of microcrystalline wax.

Further, the invention also discloses a method for preparing the natural rubber composite material, which method includes the following steps:

1) Crush the antibacterial agent and rubber reinforcing filler at high speed to obtain antibacterial sustained-release particles;

2) The antibacterial sustained-release particles are dispersed in the water phase and ground to prepare a sustained-release particle dispersion; or the antibacterial sustained-release particles are directly

3) Mix, flocculate and dry the sustained-release particle dispersion with natural rubber latex to obtain the long-lasting low-odor natural rubber composite material; or, directly mix, flocculate and flocculate the antibacterial sustained-release particles in step 1) with natural rubber latex. After drying, the long-lasting low-odor natural rubber composite material is obtained.

In step (1), high-speed crushing can be achieved using a high-speed crushing mixer; specifically, the bacteriostatic agent and rubber reinforcing filler are put into the high-speed crushing mixer. The high-speed pulverizing mixer can be any existing high-speed pulverizing mixer. During the high-speed grinding process, too low a rotational speed will result in poor grinding effect and uneven mixing and adsorption of the bacteriostatic agent and carrier; too high a rotational speed will be meaningless and will increase energy consumption, increase equipment wear, and increase equipment investment. On the other hand, it will also destroy the structure of the antibacterial carrier. The rotation speed range of the high-speed grinding mixer is 100~5000r/min, preferably 200-3000r/min.

In step (1), when the bacteriostatic agent and the rubber reinforcing filler are pulverized at high speed, the bacteriostatic agent and the rubber reinforcing filler are fully mixed and the bacteriostatic agent is adsorbed on the rubber reinforcing filler. The degree of mixing and adsorption between the antibacterial agent and the rubber reinforcing filler will have an impact on the final antibacterial and low-odor effect. In order to obtain good antibacterial and low odor effects, the antibacterial agent and rubber reinforcing filler should be fully mixed and adsorbed. When using a high-speed crushing mixer, in order to ensure sufficient mixing and adsorption during crushing, the stirring and crushing time is 1-120 minutes, preferably 5-60 minutes.

In step (2), grinding the water phase can be achieved using grinding equipment. Specifically, a high shear dispersion apparatus, an ultrasonic crusher, a colloid mill, a ball mill or a sand mill can be used, preferably a colloid mill, a ball mill or a sand mill. If the grinding time is too short, the grinding effect will be poor, the bacteriostatic agent will not be well dispersed in the rubber matrix, and there is a possibility of deterioration where there are no bacteriostatic agent particles; it will also have an impact on other properties of the rubber product. In order to solve the odor while ensuring that the product performance is not reduced or even improved; the grinding time can be 10-300min, preferably 30-120min; the grinding temperature is 25-80°C, preferably 25-60°C.

In step (2), the solid content of the obtained sustained-release particle nanodispersion is 1%-40%, preferably 3%-20%.

In step (3), if the mixing time is too short, the antibacterial slow-release particles will not be well combined with the rubber, which will cause losses and worsen the effect; if the mixing time is too long, energy consumption will be wasted. Therefore, the mixing time can be 10-120min, preferably 20-60min.

In step (3), flocculation is performed using a flocculant; the flocculant is one or more of formic acid, acetic acid, sodium chloride, calcium chloride, and protease, preferably formic acid, acetic acid, protease, and calcium chloride. one or more than two of them.

Furthermore, the present invention also discloses a low-odor, low-heat-generating tire. The tire sidewall is prepared by vulcanization of the tire rubber composition.

The present invention adopts 1,3,5-s-triazine as the most preferred solution. Other bacteriostatic agents can also be used to replace 1,3,5-s-triazine. The other bacteriostatic agents are 1,2-benzisothiazoline. -3-one, N-octyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin- One or more of 3-ketone, zinc pyrithione and sodium benzoate; preferably 1,2-benzisothiazolin-3-one, 2-methyl-4-isothiazolin-3-one , one or more of s-triazine and zinc pyrithione.

The present invention prepares a long-lasting, low-odor natural rubber nanocomposite material by adding an appropriate amount of 1,3,5-s-triazine and rubber reinforcing fillers to natural rubber latex. Among them, 1,3,5-s-triazine has the effect of inhibiting the growth of bacteria and fungi. However, if 1,3,5-s-triazine is simply added, the antibacterial effect will be short. When adding 1,3,5-s-triazine, rubber reinforcing fillers are added at the same time. On the one hand, the rubber reinforcing fillers adsorbing 1,3,5-s-triazine can play a sustained-release role, similar to sustained-release drugs, 1,3, 5. S-triazine continuously migrates outward from the pores of the rubber reinforcing filler; on the other hand, the rubber reinforcing filler can be evenly dispersed in the natural rubber, ensuring the overall antibacterial effect of the rubber. At the same time, the rubber reinforcing filler is the rubber itself The required materials will not have any impact on the rubber performance. On the contrary, since the rubber reinforcing filler is further dispersed in the rubber, the heat generation of the rubber composition can be reduced, thereby further reducing the tire rolling resistance.

Compared with the existing technology, the present invention reduces the odor level of the sidewall rubber composition by applying long-acting antibacterial and low-odor natural rubber nanocomposite materials without changing the existing process conditions of mixing, final mixing and vulcanization. and heat generation, thereby bringing beneficial improvements in odor and rolling resistance.

Detailed ways

The technical solutions in the embodiments of the present invention will be reviewed and fully described below in conjunction with the embodiments of the present invention, and the invention will be further explained. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Given the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

Example 1

A long-lasting antibacterial and low-odor natural rubber composite material. The natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

Natural rubber 100 parts

Carbon black N330 10 parts

1,3,5-s-triazine 0.1 part;

The mixing method of the above-mentioned long-lasting antibacterial and low-odor natural rubber composite material is as follows:

Take 10 parts of carbon black and 0.1 part of 1,3,5-s-triazine and mix them in a high-speed mixer at 200r/min for 10 minutes to fully mix and adsorb the carbon black and 1,3,5-s-triazine to obtain a sustained release of the bacteriostatic agent Particles, take the above-mentioned sustained-release particles of antibacterial agent and disperse them in 100 parts of purified water, use a colloid mill to grind for 30 minutes at 25°C to obtain a nano-dispersion of sustained-release particles; take the above-mentioned nano-dispersion of sustained-release particles and slowly pour it into the dry glue meter. Stir and mix 100 parts of natural rubber latex for 20 minutes to fully compound the slow-release particles in the slow-release particle nanodispersion with the latex to obtain a mixed glue. Then mix and flocculate the mixed glue with a formic acid solution of 0.8% dry glue mass. After dehydration and drying, a long-lasting low-odor natural rubber nanocomposite was obtained, and natural rubber composite A was obtained.

Example 2

A long-lasting antibacterial and low-odor natural rubber composite material. The natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

Natural rubber 100 parts

Carbon black N330 10 parts

1,3,5-tris(2-hydroxyethyl)hexahydrotriazine 0.2 parts;

The above-mentioned mixing method of a long-lasting antibacterial and low-odor natural rubber composite material is as shown in Example 1, and natural rubber composite material B is obtained.

Example 3

A long-lasting antibacterial and low-odor natural rubber composite material. The natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

Natural rubber 100 parts

Carbon black N330 10 parts

White carbon black 10 parts

Octylphenol polyoxyethylene ether 0.5 parts

1,3,5-s-triazine 0.5 parts;

The mixing method of the above-mentioned long-lasting antibacterial and low-odor natural rubber composite material is as follows:

Take 10 parts of carbon black N330, 10 parts of white carbon black and 0.5 parts of 1,3,5-s-triazine and mix them in a high-speed mixer at 200r/min for 10 minutes to fully mix and adsorb the carbon black and 1,3,5-s-triazine. , to obtain the antibacterial agent sustained-release particles, disperse the above antibacterial agent sustained-release particles in 100 parts of purified water, add 0.5 parts of octylphenol polyoxyethylene ether, and use a colloid mill to grind for 30 minutes at 25°C to obtain sustained-release nanoparticles. Dispersion; take the above sustained-release particle nanodispersion and slowly pour it into natural latex with a dry rubber count of 100 parts, stir and mix for 20 minutes, so that the sustained-release particles in the sustained-release particle nanodispersion and the latex are fully compounded to obtain a mixed glue. Then, the mixed glue liquid and a formic acid solution with 0.8% dry glue mass were mixed, flocculated, dehydrated, and dried to obtain a long-lasting low-odor natural rubber nanocomposite material, and natural rubber composite material C was obtained.

Example 4

A long-lasting antibacterial and low-odor natural rubber composite material. The natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

Natural rubber 100 parts

Carbon black N330 10 parts

Octylphenol polyoxyethylene ether 0.5 parts

1,3,5-s-triazine 0.1 part;

The mixing method of the above-mentioned long-lasting antibacterial and low-odor natural rubber composite material is as follows:

Take 10 parts of carbon black N330 and 0.1 part of 1,3,5-s-triazine and mix them in a high-speed mixer at 200r/min for 10 minutes to fully mix and adsorb the carbon black and 1,3,5-s-triazine to obtain a bacteriostatic agent. To release particles, disperse the above-mentioned antibacterial agent sustained-release particles in 100 parts of purified water, add 0.5 parts of octylphenol polyoxyethylene ether, and grind with a colloid mill at 25°C for 30 minutes to obtain a nano-dispersion of sustained-release particles; take the above-mentioned sustained-release particles. Slowly pour the release particle nanodispersion into 100 parts of natural rubber latex, stir and mix for 20 minutes, so that the slow-release particles in the sustained-release particle nanodispersion and the latex are fully compounded to obtain a mixed glue, and then mix the mixed glue with The formic acid solution with a dry rubber mass of 0.8% was mixed, flocculated, dehydrated, and dried to obtain a long-lasting low-odor natural rubber nanocomposite, and the natural rubber composite material D was obtained.

Comparative example 1

Take natural rubber latex with a solid content of 25%, add an appropriate amount of formic acid solution to flocculate, dehydrate and dry to obtain natural rubber solid rubber E.

Comparative example 2

A natural rubber composite material. The natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

Natural rubber 100 parts

Carbon black N330 10 parts;

The mixing method of the above-mentioned long-lasting antibacterial and low-odor natural rubber composite material is as follows:

Add 10 parts of carbon black to 100 parts of natural rubber latex and stir for 20 minutes to fully compound the carbon black and latex to obtain a mixed glue. Then mix and flocculate the mixed glue with a 0.8% formic acid solution by weight of dry glue. , dehydration and drying to obtain natural rubber nanocomposite F.

Comparative example 3

A natural rubber composite material. The natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

Natural rubber 100 parts

1,3,5-s-triazine 0.1 part;

The mixing method of the above-mentioned long-lasting antibacterial and low-odor natural rubber composite material is as follows:

Disperse 0.1 part of 1,3,5-s-triazine in 100 parts of purified water, then slowly pour it into 100 parts of natural rubber latex and stir for 20 minutes to fully mix the 1,3,5-s-triazine with the latex. The mixed glue liquid is obtained by compounding, and then the mixed glue liquid and a formic acid solution with 0.8% dry glue mass are mixed, flocculated, dehydrated, and dried to obtain a long-lasting low-odor natural rubber nanocomposite material, and the natural rubber composite material G is obtained.

Table 1: Sample odor rating and odor changes after 1 year of storage

Sample serial number Initial odor level Odor level after 1 year A 3.0 3.5 B 3.0 3.5 C 3.0 3.5 D 3.0 3.5 E 3.5 4.5 F 3.0 4.5 G 3.0 4.0

Note: The odor level is assessed using the 6-level method, referring to SMTC 5 400 012-2011 (V1).

Application example 1

This application example is applied to tire sidewall rubber. The reference ratio is conventional natural rubber. Examples 1-4 and Comparative Examples 1-3 respectively use natural rubber composite materials A, B, C, D, E, F, and G after 1 year of storage. The specific formulas are shown in Table 1. .

Table 2

The reference examples, Examples 1-4 and Comparative Examples 1-3 were all processed according to the same mixing and final refining process, and were vulcanized by a flat vulcanizer at 160°C for 15 minutes to prepare test pieces and then tested. The DMA test method is used to characterize the dynamic viscoelastic properties of the rubber composition, and tan δ at 60°C is used to characterize the heat generation performance of the rubber composition. The lower the tan δ, the lower the heat generation. Ozone resistance is characterized by the number and depth of ozone aging cracks. The odor is characterized by the 6-level odor method. The lower the value, the lower the odor.

The above is a description of the embodiments of the present invention. The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novelties disclosed herein.

Claims (10)

1. A sidewall rubber composition with low odor and low heat generation, characterized in that the sidewall rubber composition is prepared by kneading raw materials including the following components; Rubber A, Rubber reinforcing filler A, As well as appropriate amounts of antioxidants, accelerators, active agents and sulfur; It is characterized in that the mixing raw materials of the sidewall rubber composition also include natural rubber composite materials. The natural rubber composite materials are prepared by wet mixing of raw materials including the following components based on 100 parts by weight of rubber B: Rubber B 100 parts Rubber reinforcing filler B 5.0-20 parts 0.05-1.0 parts of 1,3,5-s-triazine or its antibacterial derivatives; In the sidewall rubber composition, rubber A + rubber B are 100 parts by weight, rubber B is natural rubber; rubber reinforcing filler A + rubber reinforcing filler B are 30-50 parts. 2. A low-odor, low-heat-generating sidewall rubber composition according to claim 1, characterized in that the natural rubber composite material is made of raw materials including the following components based on 100 parts by mass of rubber B. Produced by wet mixing: Rubber B 100 parts Rubber reinforcing filler B 8.0-15 parts 0.1-0.5 parts of 1,3,5-s-triazine or its antibacterial derivatives; Preferably, the amount of rubber reinforcing filler A + rubber reinforcing filler B is 35-45 parts. 3. A low-odor, low-heat-generating sidewall rubber composition according to claim 1 or 2, characterized in that rubber A is selected from the group consisting of natural rubber, butadiene rubber, styrene-butadiene rubber and polybutadiene rubber. One or more of them are mixed; more preferably, rubber A is selected from one or two kinds of natural rubber and polybutadiene rubber; most preferably, rubber A is polybutadiene rubber, and rubber A is 40- 60 parts, Rubber B is 40-60 parts. 4. A low-odor, low-heat-generating sidewall rubber composition according to claim 1 or 2, characterized in that the rubber reinforcing filler A and the rubber reinforcing filler B are selected from carbon black or white carbon black. one or more; Preferably, the BET specific surface area of the carbon black particles is 20 to 160 m ² /g, more preferably 40 to 130 m ² /g, further preferably 50 to 120 m ² /g; the average secondary particle size of the carbon black particles is preferably 0.05 to 3 μm, more preferably 0.1 to 1.0 μm, further preferably 0.2 to 0.9 μm; most preferably, the carbon black is one or a mixture of N134, N220, N234, N330, N375, and N550; Preferably, the BET specific surface area of silica is 50 to 250 m ² /g, preferably 80 to 210 m ² /g, and more preferably 100 to 190 m ² /g; the average secondary particle size of silica is preferably 0.04 to 3 μm. , more preferably 0.1 to 1 μm, further preferably 0.2 to 0.7 μm; Most preferably, rubber reinforcing filler A uses N550 carbon black and/or N330 carbon black, and rubber reinforcing filler B uses N330 carbon black; preferably, N550 carbon black is 25-40 parts. 5. A low-odor, low-heat-generating sidewall rubber composition according to claim 1 or 2, characterized in that the rubber reinforcing filler includes white carbon black, and the natural rubber composite material also includes surface active The surfactant is 0.1%-10% of the white carbon black content. 6. A low-odor, low-heat-generating sidewall rubber composition according to claim 5, characterized in that the surfactant is octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, One or more of fatty acid polyoxyethylene ether, decyl methyl sulfoxide and sodium lauryl sulfate, preferably octylphenol polyoxyethylene ether, fatty acid polyoxyethylene ether and sodium lauryl sulfate one or more than two of them. 7. A low-odor, low-heat-generating sidewall rubber composition according to claim 1 or 2, characterized in that the antioxidant is 1.0-2.0 parts of antioxidant TMQ and 2.5-5.0 parts of antioxidant 6PPD. , the active agent is 2.0-4.0 parts of zinc oxide and 1.0-3.0 parts of stearic acid, the accelerator is 0.5-1.0 parts of accelerator CZ, and 1.5-2.5 parts of sulfur; the rubber composition also includes 3.0-5.0 parts of V700 environmentally friendly oil , 1.0-3.0 parts of microcrystalline wax. 8. A low-odor, low-heat-generating sidewall rubber composition according to claim 1 or 2, characterized in that the preparation method of the natural rubber composite material includes the following steps: 1) Crush the antibacterial agent and rubber reinforcing filler at high speed to obtain antibacterial sustained-release particles; 2) The antibacterial sustained-release particles are dispersed in the water phase and ground to prepare a sustained-release particle dispersion; or the antibacterial sustained-release particles are directly 3) Mix, flocculate and dry the sustained-release particle dispersion with natural rubber latex to obtain the long-lasting low-odor natural rubber composite material; or, directly mix, flocculate and flocculate the antibacterial sustained-release particles in step 1) with natural rubber latex. After drying, the long-lasting low-odor natural rubber composite material is obtained. 9. The preparation method of a long-lasting antibacterial and low-odor natural rubber composite material according to claim 6, characterized in that, in step (1), The crushing speed is 100~5000r/min, preferably 200-3000r/min; and/or, The crushing time is 1-120min, preferably 5-60min; In step (2), The solid content of the sustained-release particle nanodispersion is 1%-40%, preferably 3%-20%; and/or, The grinding time is 10-300min, preferably 30-120min; and/or, The grinding temperature is 25-80°C, preferably 25-60°C; In step (3), The mixing time is 10-120min, preferably 20-60min; and/or, Flocculation is carried out using a flocculant; the flocculant is one or more of formic acid, acetic acid, sodium chloride, calcium chloride, and protease, preferably one or both of formic acid, acetic acid, protease, and calcium chloride. More than one species. 10. A tire with low odor and low heat generation, characterized in that the sidewall of the tire is prepared by vulcanization using the tire rubber composition according to any one of claims 1 to 8.