Long-lasting bacteriostatic low odor natural rubber composite, mixing method and use in tires

Abstract

The application relates to the technical field of new materials for tires, in particular to a long-acting bacteriostatic low-odor natural rubber composite material, a mixing method and application in tires. The long-acting bacteriostatic low-odor natural rubber composite material is prepared by wet mixing of the following components according to 100 parts of natural rubber by weight: 100 parts of natural rubber, 5.0-20 parts of rubber reinforcing filler, 0.05-1.0 parts of 1,3,5-sym-triazine or a derivative thereof with a bacteriostatic effect. The natural rubber composite material comprises 1,3,5-sym-triazine and its derivative as an antibacterial substance, can effectively inhibit the growth of microorganisms and bacteria in the storage state of tire preparation, avoids the generation of foul odor under the action of microorganisms and bacteria in the non-gum components in the natural rubber, and simultaneously improves the rolling resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new materials for tires, in particular to a long-acting bacteriostatic low-odor natural rubber composite material, a mixing method and application in tires. BACKGROUND

[0002] With the rapid development of the automobile industry, the requirements of vehicle enterprises for tire performance are also increasing. The requirements for both grip and rolling resistance are generally improved. Due to the strong desire for the endurance mileage of new energy vehicles, the requirements for the rolling resistance of new energy vehicles are also increasing. Therefore, only reducing the heat generation of the tread rubber and the sidewall rubber cannot meet the low rolling resistance requirements of the tire. In this regard, major tire companies have begun to develop low heat generation in base rubber, triangular rubber, and outer protective rubber.

[0003] The odor of the automobile spare tire mainly comes from the four components of the tread, the sidewall, the outer protective rubber, and the inner liner. Since the spare tire will be equipped with a rim, the inner liner has less impact on the odor. Odor substances mainly come from rubber, filling oil, anti-aging agents, and accelerators. Although odor optimization can be achieved by optimizing environmentally friendly oils, anti-aging agents, and accelerators, natural rubber is still the largest type of rubber consumed in the tire industry due to its excellent overall performance. Natural rubber, also known as Hevea rubber, is a solid natural elastomer material made from latex collected from Hevea brasiliensis trees through coagulation, dehydration, and drying processes. It is also an important strategic material and industrial raw material. Since natural rubber is biosynthesized, it contains a small amount of non-rubber components such as proteins and phospholipids. Under the action of microorganisms or bacteria, non-rubber components are decomposed into small molecules with foul odor containing amino functional groups and mercapto functional groups. Therefore, during the production, storage, and use of natural rubber, foul odor is emitted.

[0004] A large number of scholars at home and abroad have done a lot of work on the treatment of natural rubber odor, and the existing technology also discloses some methods for deodorizing natural rubber. Chinese patent CN113501893A discloses an environmentally friendly natural rubber processing method, which is to add 1:1~3 composite bacteria solution of degerming liquid and coagulation bacteria liquid to fresh latex, and then coagulate and stack the gel block for maturation to produce natural rubber raw rubber product. This method uses composite bacteria to decompose non-rubber components in fresh latex to reduce odor during gel block maturation. Chinese patent CN102558395A discloses a biological deodorization method for natural rubber fresh latex biological gel block, which is to mix 1:10~1:1 weight ratio of biological deodorization liquid prepared by inoculating test tube slant culture of strain C1 into 5wt% sugar-containing water and shaking at 28~35℃ for 2~4 days into biological coagulation liquid for coagulating fresh latex. In this method, the use mode of biological deodorization liquid is changed from traditional surface spraying type deodorization of rubber gel block to mixing with coagulant during latex coagulation and uniformly dispersing in the gel block after coagulation. It is equivalent to adding a deodorant with persistent activity during the coagulation stage of fresh latex to inhibit the generation of odor from the source, so that the gel block does not emit odor during processing due to the presence of active deodorant, and reduces the release of odor during the drying process of the rubber. Chinese patent CN108164767A discloses a non-odor natural rubber and a rubber compound thereof, which is prepared by adding a modified zeolite molecular sieve dispersion to natural rubber latex, coagulating the natural rubber latex by different coagulation methods, pressing the coagulated product to obtain a rubber sheet, hanging the rubber sheet at room temperature for a period of time, then granulating, soaking in a deodorant for a period of time, and drying in a hot air drying oven to obtain a non-odor natural rubber. The modified zeolite molecular sieve with strong adsorption capacity can adsorb the odor generated during the rubber processing process, and the deodorant soaking further reduces the odor generated during the maturation of natural rubber due to protein deterioration, which can effectively remove the odor generated during the initial processing, plasticizing and mixing of natural rubber.

[0005] The above-mentioned technologies all disclose methods for preparing non-odor natural rubber or deodorizing natural rubber, but they can only solve the technical problem of odor generated during the production of natural rubber, and do not involve the technical problem of deterioration, mold and odor during long-term storage and use of natural rubber. Therefore, how to reduce or remove the odor generated during the storage and use of natural rubber is the biggest problem faced by the natural rubber industry at present. Therefore, solving the odor of natural rubber can improve the odor grade of the tire side rubber, and further reduce the odor grade of the tire. SUMMARY

[0006] To solve the above technical problems, the present application aims to provide a long-acting bacteriostatic low-odor natural rubber composite material, which comprises 1,3,5-homotriazine and its derivatives as antibacterial substances, can effectively inhibit the growth of microorganisms and bacteria in the storage state of the tire, avoid the generation of foul odor in the natural rubber under the action of microorganisms and bacteria, and improve the rolling resistance.

[0007] To achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0008] A long-acting bacteriostatic low-odor natural rubber composite material, which is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

[0009] Natural rubber 100 parts

[0010] Rubber reinforcing filler 5.0-20 parts

[0011] 1,3,5-homotriazine or its bacteriostatic derivative 0.05-1.0 parts.

[0012] As a preferred embodiment, the natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

[0013] Natural rubber 100 parts

[0014] Rubber reinforcing filler 8.0-15 parts

[0015] 1,3,5-homotriazine or its bacteriostatic derivative 0.1-0.5 parts.

[0016] As a most preferred embodiment, the natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

[0017] Natural rubber 100 parts

[0018] Rubber reinforcing filler 10 parts

[0019] 1,3,5-homotriazine or its bacteriostatic derivative 0.1 parts.

[0020] As a preferred embodiment, the rubber reinforcing filler is selected from one or more of carbon black or white carbon black.

[0021] As a preferred embodiment, the BET specific surface area of the carbon black particles is 20-160 m 2 / g, more preferably 40-130 m 2 / g, and further preferably 50-120 m 2 / g; the average secondary particle size of the carbon black particles is preferably 0.05-3 μm, more preferably 0.1-1.0 μm, and further preferably 0.2-0.9 μm; most preferably, the carbon black is one or more of N134, N220, N234, N330, N375, and N550.

[0022] Preferably, the BET specific surface area of the white carbon black is 50-250 m 2 / g, and preferably 80-210 m 2 / g, and more preferably 100-190 m 2 / g; the average secondary particle size of the white carbon black is preferably 0.04-3 μm, more preferably 0.1-1 μm, and further preferably 0.2-0.7 μm.

[0023] Preferably, the rubber reinforcing filler comprises white carbon black, and the natural rubber composite further comprises a surfactant, the content of the surfactant being 0.1%-10% of the content of the white carbon black. The applicant has found through experiments that, in the presence of white carbon black, a surfactant needs to be added to complete the compounding of the rubber reinforcing filler with the molecular chains of the natural rubber in the aqueous phase, to achieve co-flocculation with the latex, and to achieve uniform dispersion in the rubber matrix. However, for carbon black, no surfactant needs to be added.

[0024] More preferably, the surfactant is one or more of octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, fatty acid polyoxyethylene ether, decylmethyl sulfoxide, and sodium dodecyl sulfate, and preferably is one or more of octylphenol polyoxyethylene ether, fatty acid polyoxyethylene ether, and sodium dodecyl sulfate.

[0025] Further, the application also discloses a preparation method of the natural rubber composite, which comprises the following steps:

[0026] 1) simultaneously subjecting the bacteriostatic agent and the rubber reinforcing filler to high-speed pulverization to obtain bacteriostatic slow-release particles;

[0027] 2) dispersing the bacteriostatic slow-release particles in an aqueous phase, and preparing a slow-release particle dispersion liquid through grinding; or directly dispersing the bacteriostatic slow-release particles in the natural rubber latex to prepare the slow-release particle dispersion liquid;

[0028] 3) mixing, flocculating, and drying the slow-release particle dispersion liquid and the natural rubber latex to obtain the long-acting low-odor natural rubber composite; or directly mixing, flocculating, and drying the bacteriostatic slow-release particles and the natural rubber latex to obtain the long-acting low-odor natural rubber composite.

[0029] In step (1), the high-speed crushing can be achieved by using a high-speed crushing mixer; specifically, the bacteriostatic agent and the rubber reinforcing filler are put into the high-speed crushing mixer. The high-speed crushing mixer can be any existing high-speed crushing mixer. During the high-speed crushing process, if the rotation speed is too low, the crushing effect will be poor, and the bacteriostatic agent and the carrier will not be uniformly mixed and adsorbed; if the rotation speed is too high, it will not have much significance, but will increase the energy consumption, increase the equipment wear and tear, increase the equipment investment, and on the other hand, it will also damage the structure of the bacteriostatic carrier. The rotation speed of the high-speed crushing mixer ranges from 100 to 5000 r / min, and is preferably 200-3000 r / min.

[0030] In step (1), during the high-speed crushing of the bacteriostatic agent and the rubber reinforcing filler, 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 bacteriostatic agent and the rubber reinforcing filler will affect the final bacteriostatic and low odor effect. In order to obtain good bacteriostatic and low odor effect, the bacteriostatic agent and the rubber reinforcing filler should be fully mixed and adsorbed. When using a high-speed crushing mixer, in order to ensure that the mixing and adsorption are fully mixed and adsorbed during crushing, the mixing and crushing time is 1-120 min, and is preferably 5-60 min.

[0031] In step (2), the grinding of the water phase can be achieved by using a grinding device. Specifically, a high-shear disperser, an ultrasonic crusher, a colloid mill, a ball mill or a sand mill can be used, and a colloid mill, a ball mill or a sand mill is preferred. If the grinding time is too short, the grinding effect will be poor, the bacteriostatic agent will not be dispersed well in the rubber matrix, and there will be a risk of deterioration in places where there is no bacteriostatic agent particle; it will also affect other properties of the rubber product. In order to solve the odor problem while ensuring product performance without degradation or even improvement; the grinding time can be 10-300 min, and is preferably 30-120 min; the grinding temperature is 25-80℃, and is preferably 25-60℃.

[0032] In step (2), the solid content of the slow-release particle nanodispersion obtained is 1%-40%, and is preferably 3%-20%.

[0033] In step (3), if the mixing time is too short, the bacteriostatic slow-release particles will not be well combined with the rubber, which will cause loss and result in poor effect; if the mixing time is too long, it will also cause waste of energy. Therefore, the mixing time can be 10-120 min, and is preferably 20-60 min.

[0034] In step (3), the flocculation is carried out by using a flocculating agent; the flocculating agent is one or more of formic acid, acetic acid, sodium chloride, calcium chloride, and protease, and is preferably one or more of formic acid, acetic acid, protease, and calcium chloride.

[0035] Further, the application also discloses application of the natural rubber composite in preparation of the low-odor and low-heat building rubber composition.

[0036] Further, the application also discloses a low-odor and low-heat building rubber composition, wherein the mixing raw materials of the building rubber composition comprise the natural rubber and the natural rubber composite, or only the natural rubber composite; and the proportion of the natural rubber in the natural rubber composite is at least 20 parts, with the total weight of the rubber in the building rubber composition being 100 parts.

[0037] Further, the application also discloses a low-odor and low-heat building rubber composition, wherein the mixing raw materials of the building rubber composition comprise the natural rubber and the natural rubber composite, or only the natural rubber composite; and the proportion of the natural rubber in the natural rubber composite is at least 20 parts, with the total weight of the rubber in the building rubber composition being 100 parts.

[0038] The 1,3,5-s-triazine is used as the most preferred scheme, and other bacteriostatic agents can be used to replace the 1,3,5-s-triazine, the other bacteriostatic agents are one or more than two of 1,2-benzisothiazolin-3-one, N-octyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, zinc pyrithione and sodium benzoate; preferably one or more than two of 1,2-benzisothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, s-triazine and zinc pyrithione.

[0039] The application prepares a long-acting low-odor natural rubber nanocomposite by adding appropriate amount of 1,3,5-s-triazine and rubber reinforcing filler in natural rubber latex. The 1,3,5-s-triazine has the effect of inhibiting the breeding of bacteria and fungi, but if only 1,3,5-s-triazine is added, the bacteriostatic time is short. The rubber reinforcing filler is added at the same time as the 1,3,5-s-triazine, on the one hand, the rubber reinforcing filler can absorb the 1,3,5-s-triazine to play a slow-release role, similar to slow-release drugs, the 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 uniformly dispersed in the natural rubber, ensuring the overall bacteriostatic effect of the rubber compound, and the rubber reinforcing filler is the material required by the rubber itself, which will not have any impact on the performance of the rubber, but the further dispersion of the rubber reinforcing filler in the rubber can reduce the heat generation of the rubber composition, thereby further reducing the rolling resistance of the tire.

[0040] Compared with the prior art, the application does not change the existing mixing, final mixing and vulcanization process conditions, and by applying the long-acting bacteriostatic low-odor natural rubber nanocomposite, the odor grade and heat generation of the tire rubber composition are reduced, thereby favorably improving the odor and rolling resistance. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with the embodiments of the present application, and then the present application will be further explained. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Given the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0042] Embodiment 1

[0043] A long-acting bacteriostatic low-odor natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

[0044] Natural rubber 100 parts

[0045] Carbon black N330 10 parts

[0046] 1,3,5-hydrazine 0.1 parts;

[0047] The mixing method of the above-mentioned long-acting bacteriostatic low-odor natural rubber composite material is as follows:

[0048] Take 10 parts of carbon black and 0.1 parts of 1,3,5-hydrazine and mix them in a high-speed mixer at a speed of 200 r / min for 10 min to make the carbon black and 1,3,5-hydrazine fully mixed and adsorbed to obtain bacteriostatic agent slow-release particles. Take the above-mentioned bacteriostatic agent slow-release particles and disperse them in 100 parts of pure water, use a colloid mill to grind them at 25°C for 30 min to obtain a slow-release particle nanodispersion. Take the above-mentioned slow-release particle nanodispersion and slowly pour it into 100 parts of natural latex to mix and stir for 20 min, so that the slow-release particles in the slow-release particle nanodispersion are fully compounded with the latex to obtain a mixed glue solution. Then mix the mixed glue solution with 0.8% formic acid solution of dry glue to flocculate, dewater and dry to obtain a long-acting low-odor natural rubber nanocomposite material, and obtain natural rubber composite material A.

[0049] Embodiment 2

[0050] A long-acting bacteriostatic low-odor natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

[0051] Natural rubber 100 parts

[0052] Carbon black N330 10 parts

[0053] 1,3,5-tris(2-hydroxyethyl)hexahydrotetrazine 0.2 parts;

[0054] The mixing method of the above-mentioned long-acting bacteriostatic low-odor natural rubber composite material is as shown in Embodiment 1, and natural rubber composite material B is obtained.

[0055] Example 3

[0056] A long-acting bacteriostatic low-odor natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

[0057] Natural rubber 100 parts

[0058] Carbon black N330 10 parts

[0059] White carbon black 10 parts

[0060] Octylphenol polyoxyethylene ether 0.5 parts

[0061] 1,3,5-heterocyclic triazine 0.5 parts

[0062] The mixing method of the above-mentioned long-acting bacteriostatic low-odor natural rubber composite material is as follows:

[0063] Take 10 parts of carbon black N330, 10 parts of white carbon black and 0.5 parts of 1,3,5-heterocyclic triazine in a high-speed mixer at a speed of 200 r / min for 10 min to mix the carbon black and 1,3,5-heterocyclic triazine to be fully mixed and adsorbed to obtain bacteriostatic agent slow-release particles. Take the above-mentioned bacteriostatic agent slow-release particles and disperse them in 100 parts of pure water, add 0.5 parts of octylphenol polyoxyethylene ether, and use a colloid mill to grind for 30 min at 25°C to obtain a slow-release particle nanodispersion. Slowly pour the above-mentioned slow-release particle nanodispersion into 100 parts of natural latex and stir for 20 min to make the slow-release particles in the slow-release particle nanodispersion fully composite with the latex to obtain a mixed glue solution. Then mix the mixed glue solution with 0.8% formic acid solution of dry glue to flocculate, dewater and dry to obtain a long-acting low-odor natural rubber nanocomposite material, and obtain a natural rubber composite material C.

[0064] Example 4

[0065] A long-acting bacteriostatic low-odor natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

[0066] Natural rubber 100 parts

[0067] Carbon black N330 10 parts

[0068] Octylphenol polyoxyethylene ether 0.5 parts

[0069] 1,3,5-heterocyclic triazine 0.1 parts

[0070] The mixing method of the above-mentioned long-acting bacteriostatic low-odor natural rubber composite material is as follows:

[0071] Take 10 parts of carbon black N330 and 0.1 parts of 1,3,5 triazine in a high-speed blender at 200 r / min for 10 min, so that the carbon black and 1,3,5 triazine are fully mixed and adsorbed to obtain bacteriostatic agent slow-release particles. Take the above bacteriostatic agent slow-release particles and disperse them in 100 parts of pure water, add 0.5 parts of octyl phenol polyoxyethylene ether, and use a colloid mill to grind at 25°C for 30 min to obtain a slow-release particle nanodispersion. Slowly pour the slow-release particle nanodispersion into 100 parts of natural latex and stir for 20 min to fully compound the slow-release particles in the slow-release particle nanodispersion with the latex to obtain a mixed glue solution. Then, the mixed glue solution is mixed with 0.8% formic acid solution of dry glue to flocculate, dewater, and dry to obtain a long-acting low-odor natural rubber nanocomposite, and a natural rubber composite material D is obtained.

[0072] Comparative Example 1

[0073] Take natural latex with a solid content of 25% and add an appropriate amount of formic acid solution to flocculate, dewater, and dry to obtain natural rubber solid rubber E.

[0074] Comparative Example 2

[0075] A natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

[0076] Natural rubber 100 parts

[0077] Carbon black N330 10 parts;

[0078] The mixing method of the above long-acting bacteriostatic low-odor natural rubber composite material is as follows:

[0079] Take 10 parts of carbon black and add it to 100 parts of natural latex to stir and mix for 20 min to fully compound the carbon black with the latex to obtain a mixed glue solution. Then, the mixed glue solution is mixed with 0.8% formic acid solution of dry glue to flocculate, dewater, and dry to obtain a natural rubber nanocomposite F.

[0080] Comparative Example 3

[0081] A natural rubber composite material is prepared by wet mixing the following components based on 100 parts by weight of natural rubber:

[0082] Natural rubber 100 parts

[0083] 1,3,5 triazine 0.1 parts;

[0084] The mixing method of the above long-acting bacteriostatic low-odor natural rubber composite material is as follows:

[0085] Take 0.1 parts of 1,3,5 triazine dispersed in 100 parts of pure water, then slowly pour into the dry glue meter for 100 parts of natural latex and stir for 20 min, make 1,3,5 triazine and latex fully composite to get mixed glue liquid, then mix the mixed glue liquid with 0.8% formic acid solution of dry glue quality, flocculation, dehydration, drying to obtain long-acting low odor natural rubber nanocomposite, obtain natural rubber composite material G.

[0086] Table 1: sample odor rating and odor change after 1 year of storage

[0087] Sample No. Initial Odor Rating Odor Rating After 1 Year 1 2 3 4 5 6 7 8 9 10 11 12 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

[0088] Note: odor rating is evaluated by 6-level method, and reference is made to SMTC 5 400 012-2011 (V1).

[0089] Application Example 1

[0090] This application example is applied to tire outer protective glue. The reference example is the conventional natural rubber, and examples 1-4 and comparative examples 1-3 respectively use natural rubber composite materials A, B, C, D, E, F, G stored for 1 year, and the specific formula is shown in Table 1.

[0091] Table 1

[0092]

[0093] The reference example, examples and comparative examples are all processed by the same conventional mixing and final mixing process, and the test pieces are prepared by a flat plate vulcanizing machine at 160℃ for 15 min for testing. The DMA test method is used to characterize the dynamic viscoelastic properties of the rubber composition, and tanδ at 60℃ is used to characterize the heat generation performance of the rubber composition. The lower the tanδ, the lower the heat generation. The odor is characterized by 6-level odor method, and the lower the value, the lower the odor.

[0094] Application Example 2

[0095] This application example is applied to tire side rubber. The reference example is the conventional natural rubber, and examples 1-4 and comparative examples 1-3 respectively use natural rubber composite materials A, B, C, D, E, F, G stored for 1 year, and the specific formula is shown in Table 1.

[0096] Table 2

[0097]

[0098] The ratios, examples and comparative examples were processed according to the same conventional mixing and finishing process, and the test pieces were prepared by curing for 15 min at 160°C on a flat vulcanization machine and then tested. The DMA test method was used to characterize the dynamic viscoelastic properties of the rubber composition, and tan δ at 60°C was used to characterize the heat build-up of the rubber composition, the lower the tan δ, the lower the heat build-up. The ozone resistance was characterized by the number and depth of cracks after ozone aging. The odor was characterized by a 6-level odor method, the lower the value, the lower the odor.

[0099] The above description of the examples of the present application enables those skilled in the art to implement or use the present application, through the above description of the disclosed examples. Various modifications to these examples will be apparent to those skilled in the art. The general principles defined herein can be implemented in other examples without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the examples shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for producing a natural rubber composite material, characterized by, The natural rubber composite is prepared by wet mixing the following components based on 100 parts by weight of natural rubber: Natural rubber 100 parts Rubber reinforcing filler 5.0-20 parts 1,3,5-sym-triazine or its derivatives with antibacterial effect 0.05-1.0 parts. The preparation method of the natural rubber composite comprises the following steps: 1) simultaneously pulverizing 1,3,5-sym-triazine or its derivatives with antibacterial effect and rubber reinforcing filler to obtain antibacterial slow-release particles; 2) dispersing the antibacterial slow-release particles in an aqueous phase to prepare a slow-release particle dispersion liquid by grinding; 3) mixing, flocculating and drying the slow-release particle dispersion liquid and natural rubber latex to obtain the long-acting low-odor natural rubber composite. In step 1), the pulverizing speed is 100-5000 r / min, and the pulverizing time is 1-120 min; in step 2), the solid content of the slow-release particle nanodispersion liquid is 1%-40%, the grinding time is 10-300 min, and the grinding temperature is 25-80℃; in step 3), the mixing time is 10-120 min; the flocculation is performed using a flocculating agent.

2. The method of claim 1, wherein the natural rubber composite is prepared by mixing the natural rubber, the filler, and the at least one additive. The natural rubber composite is prepared by wet mixing the following components based on 100 parts by weight of natural rubber: Natural rubber 100 parts Rubber reinforcing filler 8.0-15 parts 1,3,5-sym-triazine or its derivatives with antibacterial effect 0.1-0.5 parts.

3. A method of producing a natural rubber composite according to claim 1 or 2, characterized in that, The rubber reinforcing filler is selected from one or more of carbon black or white carbon black.

4. The method of claim 3, wherein the natural rubber composite is prepared by mixing the natural rubber, the filler, and the at least one additive. The BET specific surface area of the carbon black particles is 20 to 160 m 2 / g.

5. The method for preparing a natural rubber composite material according to claim 3, characterized in that, The BET specific surface area of the carbon black particles is 40 to 130 m 2 / g.

6. The method for preparing a natural rubber composite material according to claim 3, characterized in that, The BET specific surface area of the carbon black particles is 50 to 120 m 2 / g.

7. The method for preparing a natural rubber composite material according to claim 3, characterized in that, The average secondary particle diameter of the carbon black particles is 0.05-3 μm.

8. The method for preparing a natural rubber composite material according to claim 3, characterized in that, The average secondary particle diameter of the carbon black particles is 0.1-1.0 μm.

9. The method for preparing a natural rubber composite material according to claim 3, characterized in that, The average secondary particle diameter of the carbon black particles is 0.2-0.9 μm.

10. The method for preparing a natural rubber composite material according to claim 3, characterized in that, The average secondary particle diameter of the carbon black particles is one or more of carbon black N134, N220, N234, N330, N375 and N550.

11. The method for preparing a natural rubber composite material according to claim 3, characterized in that, The BET specific surface area of the white carbon black is 50 to 250 m 2 / g.

12. The method for preparing a natural rubber composite material according to claim 3, characterized in that, The BET specific surface area of the white carbon black is 80 to 210 m 2 / g.

13. The method for preparing a natural rubber composite material according to claim 3, characterized in that, The BET specific surface area of the white carbon black is 100 to 190 m 2 / g.

14. The method for preparing a natural rubber composite material according to claim 3, characterized in that, The average secondary particle diameter of the white carbon black is 0.04-3 μm.

15. The method for preparing a natural rubber composite material according to claim 3, characterized in that, The average secondary particle diameter of the white carbon black is 0.1-1 μm.

16. The method for preparing a natural rubber composite material according to claim 3, characterized in that, The average secondary particle diameter of the white carbon black is 0.2-0.7 μm.

17. The method for preparing a natural rubber composite material according to claim 3, characterized in that, The rubber reinforcing filler includes white carbon black, and the natural rubber composite further includes a surfactant, the content of the surfactant being 0.1%-10% of the white carbon black.

18. The method of claim 17, wherein the natural rubber composite is prepared by mixing the natural rubber, the filler, and the at least one additive. The surfactant is one or more of octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, fatty acid polyoxyethylene ether, decylmethyl sulfoxide and sodium dodecyl sulfate.

19. The method of claim 18, wherein the natural rubber composite is prepared by mixing the natural rubber, the filler, and the at least one additive. The surfactant is one or more of octylphenol polyoxyethylene ether, fatty acid polyoxyethylene ether and sodium dodecyl sulfate.

20. The method of claim 1 or 2, wherein the natural rubber composite is prepared by the steps of: In step 1), the pulverizing speed is 200-3000 r / min.

21. The method of claim 1 or 2, wherein the natural rubber composite is prepared by the steps of: In step 1), the pulverizing time is 5-60 min.

22. The method of claim 1 or 2, wherein the natural rubber composite is prepared by the steps of: In step 2), the solid content of the slow-release particle nanodispersion liquid is 3%-20%.

23. A method for preparing a natural rubber composite material according to claim 1 or 2, characterized in that, In step 2), the grinding time is 30-120 min.

24. A method for preparing a natural rubber composite material according to claim 1 or 2, characterized in that, In step 2), the grinding temperature is 25-60℃.

25. A method for preparing a natural rubber composite material according to claim 1 or 2, characterized in that, In step 3), the mixing time is 20-60 min.

26. The method of claim 1 or 2, wherein the natural rubber composite is prepared by the steps of: In step 3), the flocculating agent is one or more of formic acid, acetic acid, sodium chloride, calcium chloride and protease.

27. A method for preparing a natural rubber composite material according to claim 1 or 2, characterized in that, In the step 3), the flocculating agent is one or more of formic acid, acetic acid, protease, calcium chloride.

28. Natural rubber composite material obtained by the preparation method according to any one of claims 1-27.

29. Use of the natural rubber composite material according to claim 28 in the preparation of a low-heat-generating tire rubber composition.

30. A low heat-generating tire rubber composition characterized by, The mixing raw material of the composition comprises natural rubber and the natural rubber composite material according to claim 28, or only the natural rubber composite material; the proportion of the natural rubber in the natural rubber composite material is at least 20 parts based on 100 parts of the total weight of the rubber in the composition.

31. A low heat-generating tire characterized by comprising: At least one part of the tire is vulcanized by using the tire rubber composition according to claim 30.

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