Application of anti-fatigue agent in belted layer cushion rubber

Abstract

The invention provides application of an anti-fatigue agent in belted layer cushion rubber, and belongs to the technical field of belted layer cushion rubber. Comprising the steps of preparing the anti-fatigue synergist and mixing. The preparation of the anti-fatigue synergist comprises the steps of natural rubber pretreatment and combination. The natural rubber pretreatment step comprises the following steps: adding natural rubber into xylene, stirring at 78-81 DEG C for 2.0-2.3 hours, adding a dibenzoyl peroxide solution at 74-75 DEG C, stirring for 20-25 minutes, adding an epoxy chloropropane mixed solution at 85-86 DEG C, stirring for 2.0-2.5 hours, and stirring at 88-92 DEG C for 25-30 minutes to obtain pretreated natural rubber; the anti-fatigue agent and the anti-fatigue synergist are matched for preparing the belted layer cushion rubber, and the obtained product is excellent in mechanical property, good in fatigue resistance and high in stability.

Description

Technical Field

[0001] This invention belongs to the technical field of belt layer padding adhesive, specifically relating to the application of an anti-fatigue agent in belt layer padding adhesive. Background Technology

[0002] With the standardization of the domestic transportation industry and the development of highways, the cargo-carrying mode of transport vehicles is gradually transitioning and switching from low-speed, high-load to high-speed, standard-load. There are more and more standard-load transport vehicles with a one-way transport distance of 1,000 km. Due to the heat accumulation in the tires caused by the increased transport distance, the phenomenon of shoulder gap in all-steel radial truck tires is also frequent. During the tire's operation, due to the large shear deformation of the edge of the belt layer of the all-steel radial tire, in order to protect the belt layer from delamination due to impact, a rubber pad is placed at the end of the tire shoulder on both sides of the belt layer. The rubber pad separates the ends of the cord layer and the buffer layer, so that the hard tread transitions smoothly to the soft sidewall, and transfers and absorbs the stress concentrated in the tire shoulder under dynamic conditions, reducing the danger of shoulder gap and the bending deformation of the steel cord.

[0003] Existing technologies for preparing belt layer gaskets typically use a natural rubber system, with carbon black and silica as reinforcing agents, zinc oxide and stearic acid as activators, combined with antioxidants, vulcanizing agents, and other components, and then mixed together. However, belt layer gaskets prepared using existing technologies generate high dynamic heat. During high-speed or high-load driving, the heat generated by internal friction of the rubber compound is difficult to dissipate quickly, leading to increased tire temperature, accelerated aging of the rubber compound, and promotion of fatigue crack initiation and propagation. Existing antioxidants are mainly for protection against thermo-oxidative aging and cannot effectively alleviate molecular chain damage caused by stress fatigue. Once a crack occurs, it will propagate rapidly under alternating stress, eventually leading to gasket delamination failure. Furthermore, traditional mixing processes cannot achieve ideal dispersion of reinforcing fillers such as carbon black, and filler aggregation points become stress concentration points, accelerating fatigue failure.

[0004] Studies have found that adding anti-fatigue agents to the belt layer pad formulation, the most typical of which is a complex of m-phenylenediamine and phenolic resin, produces a synergistic effect after complexation, forming a dynamic repair network structure. However, in practical applications, it has been found that although m-phenylenediamine-phenolic resin complex fatigue inhibitors can improve the initial fatigue performance of the belt pad to some extent, the strong polarity of the complex between m-phenylenediamine and phenolic resin, and the weak polarity of natural rubber, result in poor compatibility between the two. This leads to the complex easily agglomerating in the rubber matrix, which not only fails to exert a uniform anti-fatigue effect but also forms new stress concentration points, and may even reduce the mechanical properties and toughness of the belt layer pad. Moreover, polar additives have a strong tendency to migrate to the surface in non-polar rubber, causing the fatigue inhibitor to migrate from the interior of the rubber to the surface and be lost, making its fatigue resistance unsustainable and its performance significantly degraded after long-term aging. Furthermore, the thermal stability of the m-phenylenediamine-phenolic resin complex is limited. Under the high-temperature conditions of tire vulcanization and use, it is prone to decomposition and volatilization, not only losing its anti-fatigue effect but also causing its decomposition products to accelerate the aging and performance degradation of the belt layer pad.

[0005] Therefore, this invention provides an anti-fatigue agent for use in belt layer pad rubber, employing a complex system of m-phenylenediamine and phenolic resin to improve compatibility with the rubber matrix, enhance the mechanical properties and fatigue resistance of the pad rubber, and improve high-temperature stability. This has significant practical implications for improving the high-speed performance and durability of tires and extending their service life. Summary of the Invention

[0006] To address the technical problems existing in the prior art, this invention provides an application of an anti-fatigue agent in belt layer padding. It employs a complexation system of m-phenylenediamine and phenolic resin to improve compatibility with the rubber matrix, while also exhibiting low heat generation, low hysteresis loss, enhanced mechanical properties and anti-fatigue performance of the padding, and improved high-temperature stability.

[0007] To address the aforementioned technical problems, the present invention adopts the following technical solution: The application of an anti-fatigue agent in belt layer pad rubber includes the preparation of an anti-fatigue synergist and a mixing step, specifically including the following: 1. Preparation of anti-fatigue synergists (1) Pretreatment of natural rubber Add natural rubber to xylene, raise the temperature to 78-81℃, stir at 150-180 rpm for 2.0-2.3 h, lower the temperature to 74-75℃, reduce the stirring speed to 115-120 rpm, add benzoyl peroxide solution, control the addition rate at 0.25-0.30 g / min, after addition, keep warm and stir for 20-25 min, raise the temperature to 85-86℃, add epichlorohydrin mixture at 180-200 rpm, control the addition rate at 0.20-0.22 g / min, after addition, keep warm and stir for 2.0-2.5 h, keep warm and stir at 88-92℃ for 25-30 min, after precipitation, wash and dry to obtain pretreated natural rubber; The mass ratio of the xylene, natural rubber, benzoyl peroxide solution, and epichlorohydrin mixture is 500:100-105:11.0-11.2:10.10-10.12; The type of natural rubber is natural rubber STR20; The benzoyl peroxide solution is a mixture of xylene and benzoyl peroxide, wherein the mass ratio of xylene to benzoyl peroxide is 10:1.0-1.2; The epichlorohydrin mixture is a mixture of epichlorohydrin and hydroquinone, wherein the mass ratio of epichlorohydrin to hydroquinone is 10:0.10-0.12; (2) Combination Pretreated natural rubber is added to toluene, the temperature is raised to 78-82℃, and the mixture is stirred at this temperature for 1.5-2.0 hours. Kaolin treated with silane is added and stirred evenly. Triethylamine is then added, the temperature is raised to 98-100℃, and the mixture is stirred at 170-185 rpm for 2.0-2.2 hours. After washing and drying, the anti-fatigue synergist is obtained. The mass ratio of the pretreated natural rubber, toluene, silane-treated kaolin, and triethylamine is 40:250-300:10-13:0.15-0.18. The method for preparing silane-treated kaolin is as follows: nano-kaolin is placed in anhydrous ethanol, stirred evenly, then kH560 silane coupling agent is added, the temperature is raised to 60-64℃, and stirred for 3.0-3.5h. After filtration, washing and drying, silane-treated kaolin is obtained. The particle size of the nano-kaolin is 100-130 nm; The mass ratio of the nano-kaolin, anhydrous ethanol, and kH560 silane coupling agent is 10-12:90:0.6-0.8.

[0008] 2. Mixing Natural rubber and plasticizer are mixed and kneaded at 53-57 rpm for 29-31 seconds at a kneading temperature of 100-103℃. Carbon black, silica, TESPT silane coupling agent, zinc oxide, stearic acid, antioxidant 4020, and antioxidant RD are added and kneaded at 43-47 rpm for 24-27 seconds at a kneading temperature of 128-132℃. The mixture is then removed from the kneading wheel and kneaded at 38-43 rpm for 28-32 seconds. The rubber is discharged at 153-156℃ to obtain a first stage of masterbatch. Mix the first stage masterbatch, anti-fatigue agent, and anti-fatigue synergist, press and mix at 38-42 rpm for 29-31 seconds at a mixing temperature of 110-113℃, remove the grinding wheel and clean, press and mix at 28-31 rpm for 18-22 seconds at a mixing temperature of 128-132℃, remove the grinding wheel and clean, press and mix at 27-31 rpm for 18-22 seconds, and discharge the glue at 147-152℃ to obtain the second stage masterbatch; Mix the second-stage masterbatch, sulfur, accelerator NS, and scorching inhibitor CTP, and knead at 28-33 rpm for 23-26 seconds at a kneading temperature of 78-82℃. Remove the roller and clean. Knead again at 18-22 rpm for 18-22 seconds at a kneading temperature of 89-92℃. Remove the roller and clean again. Knead again at 17-21 rpm for 18-22 seconds. Discharge the rubber at 104-106℃ to obtain the belt layer pad rubber. The mass ratio of the natural rubber, plasticizer, carbon black, silica, TESPT silane coupling agent, zinc oxide, stearic acid, antioxidant 4020, antioxidant RD, anti-fatigue agent, anti-fatigue synergist, sulfur, accelerator NS, and scorching inhibitor CTP is 100:0.10-0.12:35-38:4-6:1.0-1.2:4.8-5.3:1.4-1.7:1.4-1.6:1.8-2.2:2.4-2.7:1.7-2.0:3.8-4.2:1.6-1.8:0.44-0.46; The type of natural rubber is natural rubber STR20; The plasticizer is pentachlorothiophenol; The anti-fatigue agent is brand name G-108 and is manufactured by Taizhou Huangyan Donghai Chemical Co., Ltd.

[0009] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. This invention employs a specific method to prepare an anti-fatigue synergist that works synergistically with the anti-fatigue agent to significantly improve the fatigue resistance of the belt layer pad rubber, ensuring its mechanical properties and stability. Specifically, natural rubber is used as the matrix of the anti-fatigue synergist, and benzoyl peroxide is used as a free radical initiator. The free radicals initiate the ring-opening of epichlorohydrin, binding the epoxy groups and chloromethyl groups to the rubber molecular chain, thereby improving the reactivity of the natural rubber. Then, it is combined with kaolin treated with silane to improve the compatibility and bonding between the rubber and kaolin, thus obtaining a product with kaolin as the rigid material. The core of the product is natural rubber, which acts as a fatigue synergist for the flexible shell, ensuring uniform dispersion of the fatigue synergist in the rubber matrix and preventing stress concentration. Kaolin, as a rigid filler, can improve the tensile strength of the product and reduce fatigue heat generation. The fatigue synergist is a complex of m-phenylenediamine and phenolic resin, which can capture free radicals generated during fatigue and slow down the breaking of molecular bonds. The synergy of the two can significantly improve the fatigue resistance and stability of the product. Combined with fillers, plasticizers, and anti-aging agents in the mixing process, the stability of the belt layer pad rubber is improved. 2. The belt layer pad obtained by this invention has a tensile strength of 28.8-30.2 MPa, a 100% constant elongation stress of 3.11-3.17 MPa, a 300% constant elongation stress of 12.5-12.8 MPa, a tear strength of 61.2-62.5 kN / m, and an elongation at break of 594-602%. 3. The belt layer pad adhesive obtained by this invention has a DMA tanδ of 0.041-0.046 at 60℃ and a fatigue temperature rise of 8.0-8.3℃; 4. The belt layer pad obtained by the present invention was subjected to 10 temperature change cycles, and the 300% constant elongation stress was measured again to be 11.8-12.3MPa, the tear strength was 58.1-60.2kN / m, and the elongation at break was 567-582%. Detailed Implementation

[0010] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention are now described.

[0011] Example 1 1. Preparation of anti-fatigue synergists (1) Pretreatment of natural rubber Add 105g of natural rubber to 500g of xylene, raise the temperature to 81℃, stir at 180rpm for 2.3 h, lower the temperature to 75℃, reduce the stirring speed to 120rpm, add 11.0g of benzoyl peroxide solution, control the addition rate at 0.30g / min, after the addition is complete, keep warm and stir for 25min, raise the temperature to 86℃, add 10.12g of epichlorohydrin mixture at 200rpm, control the addition rate at 0.22g / min, after the addition is complete, keep warm and stir for 2.5h, keep warm and stir at 92℃ for 30min, after precipitation, wash and dry to obtain pretreated natural rubber; The type of natural rubber is natural rubber STR20; The benzoyl peroxide solution is a mixture of xylene and benzoyl peroxide, wherein the mass ratio of xylene to benzoyl peroxide is 10:1.0; The epichlorohydrin mixture is a mixture of epichlorohydrin and hydroquinone, wherein the mass ratio of epichlorohydrin to hydroquinone is 10:0.12. (2) Combination 40g of pretreated natural rubber was added to 300g of toluene, the temperature was raised to 82℃, and the mixture was stirred for 2.0h. 13g of silane-treated kaolin was added and stirred evenly. Then, 0.18g of triethylamine was added, the temperature was raised to 100℃, and the mixture was stirred at 185rpm for 2.2h. After washing and drying, the anti-fatigue synergist was obtained. The method for preparing silane-treated kaolin is as follows: 12g of nano-kaolin is placed into 90g of anhydrous ethanol, stirred evenly, and then 0.8g of kH560 silane coupling agent is added. The temperature is raised to 64℃, and the mixture is kept warm and stirred for 3.5h. After filtration, washing and drying, silane-treated kaolin is obtained. The particle size of the nano-kaolin is 130 nm.

[0012] 2. Mixing Mix 100g of natural rubber and 0.12g of plasticizer, press and mix at 57rpm for 31s at a mixing temperature of 103℃, add 38g of carbon black, 6g of silica, 1.2g of TESPT silane coupling agent, 5.3g of zinc oxide, 1.7g of stearic acid, 1.6g of antioxidant 4020, and 2.2g of antioxidant RD, press and mix at 47rpm for 27s at a mixing temperature of 132℃, remove the roller to clean, press and mix at 43rpm for 32s, and discharge the rubber at 156℃ to obtain a first stage of masterbatch; Mix one stage of masterbatch, 2.7g of anti-fatigue agent, and 2.0g of anti-fatigue synergist. Knead at 42rpm for 31s at a kneading temperature of 113℃. Remove the kneading wheel and clean. Knead at 31rpm for 22s at a kneading temperature of 132℃. Remove the kneading wheel and clean. Knead at 31rpm for 22s. Discharge the masterbatch at 152℃ to obtain the second stage of masterbatch. Mix the second-stage masterbatch, 4.2g of sulfur, 1.8g of accelerator NS, and 0.46g of anti-scorching agent CTP. Mix at 33rpm for 26s at a mixing temperature of 82℃. Remove the roller and clean. Mix at 22rpm for 22s at a mixing temperature of 92℃. Remove the roller and clean. Mix at 21rpm for 22s. Discharge the rubber at 106℃ to obtain the belt layer pad rubber. The type of natural rubber is natural rubber STR20; The plasticizer is pentachlorothiophenol; The anti-fatigue agent is brand name G-108 and is manufactured by Taizhou Huangyan Donghai Chemical Co., Ltd.

[0013] Example 2 1. Preparation of anti-fatigue synergists (1) Pretreatment of natural rubber Add 103g of natural rubber to 500g of xylene, raise the temperature to 80℃, stir at 160rpm for 2.2 h, lower the temperature to 75℃, reduce the stirring speed to 118rpm, add 11.0g of benzoyl peroxide solution, control the addition rate at 0.28g / min, after the addition is complete, keep warm and stir for 23min, raise the temperature to 86℃, add 10.12g of epichlorohydrin mixture at 190rpm, control the addition rate at 0.20g / min, after the addition is complete, keep warm and stir for 2.3h, keep warm and stir at 90℃ for 28min, after precipitation, wash and dry to obtain pretreated natural rubber; The type of natural rubber is natural rubber STR20; The benzoyl peroxide solution is a mixture of xylene and benzoyl peroxide, wherein the mass ratio of xylene to benzoyl peroxide is 10:1.0; The epichlorohydrin mixture is a mixture of epichlorohydrin and hydroquinone, wherein the mass ratio of epichlorohydrin to hydroquinone is 10:0.12. (2) Combination 40g of pretreated natural rubber was added to 280g of toluene, the temperature was raised to 80℃, and the mixture was stirred for 1.8h. 12g of silane-treated kaolin was added and stirred evenly. Then, 0.17g of triethylamine was added, the temperature was raised to 100℃, and the mixture was stirred at 180rpm for 2.2h. After washing and drying, the anti-fatigue synergist was obtained. The method for preparing silane-treated kaolin is as follows: 12g of nano-kaolin is placed into 90g of anhydrous ethanol, stirred evenly, and then 0.7g of kH560 silane coupling agent is added. The temperature is raised to 62℃, and the mixture is kept warm and stirred for 3.2h. After filtration, washing and drying, silane-treated kaolin is obtained. The particle size of the nano-kaolin is 120 nm.

[0014] 2. Mixing Mix 100g of natural rubber and 0.12g of plasticizer, press and mix at 55rpm for 30s at a mixing temperature of 102℃, add 37g of carbon black, 5g of silica, 1.2g of TESPT silane coupling agent, 5.0g of zinc oxide, 1.6g of stearic acid, 1.5g of antioxidant 4020, and 2.0g of antioxidant RD, press and mix at 45rpm for 26s at a mixing temperature of 130℃, remove the roller to clean, press and mix at 40rpm for 30s, and discharge the rubber at 155℃ to obtain a first stage of masterbatch; Mix the first stage of masterbatch, 2.5g of anti-fatigue agent, and 1.8g of anti-fatigue synergist. Press the mixture at 40 rpm for 30 seconds at a mixing temperature of 112℃. Remove the grinding wheel and clean the mixture. Press the mixture at 30 rpm for 20 seconds at a mixing temperature of 130℃. Remove the grinding wheel and clean the mixture. Press the mixture at 30 rpm for 20 seconds. Discharge the mixture at 150℃ to obtain the second stage of masterbatch. Mix the second-stage masterbatch, 4.0g sulfur, 1.7g accelerator NS, and 0.45g anti-scorching agent CTP. Mix at 30rpm for 25s at a mixing temperature of 80℃. Remove the roller and clean. Mix at 20rpm for 20s at a mixing temperature of 90℃. Remove the roller and clean. Mix at 20rpm for 20s. Discharge the rubber at 105℃ to obtain the belt layer pad rubber. The type of natural rubber is natural rubber STR20; The plasticizer is pentachlorothiophenol; The anti-fatigue agent is brand name G-108 and is manufactured by Taizhou Huangyan Donghai Chemical Co., Ltd.

[0015] Example 3 1. Preparation of anti-fatigue synergists (1) Pretreatment of natural rubber Add 100g of natural rubber to 500g of xylene, raise the temperature to 78℃, stir at 150rpm for 2.0 h, lower the temperature to 74℃, reduce the stirring speed to 115rpm, add 11.2g of benzoyl peroxide solution, control the addition rate at 0.25g / min, after the addition is complete, keep warm and stir for 20min, raise the temperature to 85℃, add 10.10g of epichlorohydrin mixture at 180rpm, control the addition rate at 0.20g / min, after the addition is complete, keep warm and stir for 2.0h, keep warm and stir at 88℃ for 25min, after precipitation, wash and dry to obtain pretreated natural rubber; The type of natural rubber is natural rubber STR20; The benzoyl peroxide solution is a mixture of xylene and benzoyl peroxide, wherein the mass ratio of xylene to benzoyl peroxide is 10:1.2. The epichlorohydrin mixture is a mixture of epichlorohydrin and hydroquinone, wherein the mass ratio of epichlorohydrin to hydroquinone is 10:0.10. (2) Combination 40g of pretreated natural rubber was added to 250g of toluene, the temperature was raised to 78℃, and the mixture was stirred for 1.5h. 10g of silane-treated kaolin was added and stirred evenly. Then, 0.15g of triethylamine was added, the temperature was raised to 98℃, and the mixture was stirred at 170rpm for 2.0h. After washing and drying, the anti-fatigue synergist was obtained. The method for preparing silane-treated kaolin is as follows: 10g of nano-kaolin is placed into 90g of anhydrous ethanol, stirred evenly, and then 0.6g of kH560 silane coupling agent is added. The temperature is raised to 60℃, and the mixture is kept warm and stirred for 3.0h. After filtration, washing and drying, silane-treated kaolin is obtained. The particle size of the nano-kaolin is 100 nm.

[0016] 2. Mixing Mix 100g of natural rubber and 0.10g of plasticizer, press and mix at 53rpm for 29s at a mixing temperature of 100℃, add 35g of carbon black, 4g of silica, 1.0g of TESPT silane coupling agent, 4.8g of zinc oxide, 1.4g of stearic acid, 1.4g of antioxidant 4020, and 1.8g of antioxidant RD, press and mix at 43rpm for 24s at a mixing temperature of 128℃, remove the roller to clean, press and mix at 38rpm for 28s, and discharge the rubber at 153℃ to obtain a first stage of masterbatch; Mix the first stage of masterbatch, 2.4g of anti-fatigue agent, and 1.7g of anti-fatigue synergist. Knead at 38 rpm for 29 seconds at a kneading temperature of 110℃. Remove the kneading wheel and clean. Knead at 28 rpm for 18 seconds at a kneading temperature of 128℃. Remove the kneading wheel and clean. Knead at 27 rpm for 18 seconds. Discharge the masterbatch at 147℃ to obtain the second stage of masterbatch. Mix the second-stage masterbatch, 3.8g of sulfur, 1.6g of accelerator NS, and 0.44g of anti-scorching agent CTP. Mix at 28rpm for 23s at a mixing temperature of 78℃. Remove the roller and clean. Mix at 18rpm for 18s at a mixing temperature of 89℃. Remove the roller and clean. Mix at 17rpm for 18s. Discharge the rubber at 104℃ to obtain the belt layer pad rubber. The type of natural rubber is natural rubber STR20; The plasticizer is pentachlorothiophenol; The anti-fatigue agent is brand name G-108 and is manufactured by Taizhou Huangyan Donghai Chemical Co., Ltd.

[0017] Comparative Example 2-1 The changes made in Example 2 are as follows: In the mixing step, the anti-fatigue synergist component is omitted, and the anti-fatigue synergist is replaced by an equal amount of anti-fatigue agent; the anti-fatigue agent is grade G-108 and manufactured by Taizhou Huangyan Donghai Chemical Co., Ltd. The rest of the operations are exactly the same.

[0018] Comparative Example 2-2 The changes made in Example 2 are as follows: The method for preparing the anti-fatigue synergist is as follows: 40g of natural rubber STR20 is added to 280g of toluene, the temperature is raised to 80℃, and the mixture is stirred at this temperature for 1.8h. Then, 12g of nano-kaolin is added and stirred evenly. Finally, 0.17g of triethylamine is added, the temperature is raised to 100℃, and the mixture is stirred at 180rpm for 2.2h. After washing and drying, the anti-fatigue synergist is obtained. The particle size of the nano-kaolin is 120 nm; The rest of the operations are exactly the same.

[0019] Performance testing The belt layer pad rubbers prepared in Examples 1-3, Comparative Examples 2-1, and Comparative Examples 2-2 were vulcanized at a vulcanization pressure of 5.0 MPa, a vulcanization temperature of 151°C, and a vulcanization time of 20 min to obtain the test samples. The test samples obtained from Examples 1-3, Comparative Example 2-1, and Comparative Example 2-2 were subjected to comprehensive performance tests, and the test results are as follows:

[0020] Among them, the DMA test is to test the test sample using dynamic mechanical analysis. The test mode is tensile mode, with dynamic strain of 0.25% and static strain of 1%, and tanδ is tested at 60℃. The fatigue temperature rise was tested according to the method in GB / T1687.3-2016 (Determination of temperature rise and fatigue resistance of vulcanized rubber in flexural test), with a test temperature of 55℃, a prestress of 1.0MPa, a stroke of 4.45mm, a frequency of 30Hz, and a test time of 25min.

[0021] The test samples obtained from Examples 1-3, Comparative Example 2-1, and Comparative Example 2-2 were heated to 90°C at a rate of 5.0°C / min, allowed to stand for 12 hours, and then cooled to -32°C at a rate of 5.0°C / min, allowed to stand for 12 hours. This process constituted one temperature change cycle, and was repeated for 10 temperature change cycles. The mechanical properties were then tested again, as detailed below:

[0022] In Comparative Example 2-1, the anti-fatigue synergist was replaced with an equal amount of anti-fatigue agent during the mixing step, omitting the anti-fatigue synergist component. It lacked additional reinforcing particles, relying solely on carbon black and silica as reinforcing phases, and depended entirely on the filler-based system in the mixing step. This resulted in very low product strength. In the temperature variation test, Comparative Example 2-1 showed reduced mechanical property retention, and due to its higher content of anti-fatigue agent, its fatigue resistance was higher than that of Comparative Example 2-2. Comparative Example 2-2 used natural rubber and kaolin. As an anti-fatigue synergist, kaolin has poor dispersibility and is prone to agglomeration. It also has poor compatibility with rubber and low reinforcing efficiency. Its strength is higher than that of Comparative Example 2-1, but Comparative Example 2-2 has poor dispersibility and more serious agglomeration. These agglomeration points become stress concentration points and are prone to cracking. In the variable temperature test, its stability is poor and its mechanical property retention rate is the lowest. Furthermore, the mixture of kaolin and natural rubber cannot form a synergistic effect with the anti-fatigue agent, which will eventually deteriorate the fatigue resistance and result in poor fatigue resistance.

[0023] Unless otherwise stated, all percentages used in this invention are mass percentages.

[0024] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. Use of an anti-fatigue agent in a belt filler, characterized in that, The application relates to a preparation method of an anti-fatigue synergist, a mixing step, and the anti-fatigue synergist. The application relates to a preparation method of an anti-fatigue synergist, a mixing step, and the anti-fatigue synergist. The application relates to a preparation method of an anti-fatigue synergist, a mixing step, and the anti-fatigue synergist. The application relates to a preparation method of an anti-fatigue synergist, a mixing step, and the anti-fatigue synergist.

2. The application of the anti-fatigue agent in the belt pad according to claim 1, wherein the mass ratio of the xylene, the natural rubber, the dibenzoyl peroxide solution and the epichlorohydrin mixed solution in the natural rubber pretreatment step is 500:100-105:11.0-11.2:10.10-10.

12. The type of the natural rubber is natural rubber STR20.

3. The application of the anti-fatigue agent in the belt pad according to claim 1, wherein the dibenzoyl peroxide solution in the natural rubber pretreatment step is a mixture of xylene and dibenzoyl peroxide, and the mass ratio of the xylene and the dibenzoyl peroxide is 10:1.0-1.

2. The epichlorohydrin mixed solution is a mixture of epichlorohydrin and hydroquinone, and the mass ratio of the epichlorohydrin and the hydroquinone is 10:0.10-0.

12.

4. The application of the anti-fatigue agent in the belt pad according to claim 1, wherein the mass ratio of the pretreated natural rubber, the toluene, the silane-treated kaolin and the triethylamine in the mixing step is 40:250-300:10-13:0.15-0.

18.

5. The application of the anti-fatigue agent in the belt pad according to claim 1, wherein the preparation method of the silane-treated kaolin is as follows: nanometer kaolin is put into anhydrous ethanol and stirred uniformly, then kH560 silane coupling agent is added, the temperature is increased to 60-64 DEG C, and the mixture is stirred for 3.0-3.5 h, and then the silane-treated kaolin is obtained through filtration, washing and drying. The particle size of the nanometer kaolin is 100-130 nm. The mass ratio of the nanometer kaolin, the anhydrous ethanol and the kH560 silane coupling agent is 10-12:90:0.6-0.

8.

6. The application of the anti-fatigue agent in the belt pad according to claim 1, ​ ​ ​ ​ The mixing step is to mix natural rubber and peptizer, 53-57 rpm pressure mixing for 29-31 s, the mixing temperature is 100-103℃, add carbon black, silica, TESPT silane coupling agent, zinc oxide, stearic acid, antioxidant 4020, antioxidant RD, 43-47 rpm pressure mixing for 24-27 s, the mixing temperature is 128-132℃, clean up, 38-43 rpm pressure mixing for 28-32 s, 153-156℃ discharge to obtain a first-stage masterbatch; Mix the first-stage masterbatch, anti-fatigue agent and anti-fatigue synergist, 38-42 rpm pressure mixing for 29-31 s, the mixing temperature is 110-113℃, clean up, 28-31 rpm pressure mixing for 18-22 s, the mixing temperature is 128-132℃, clean up, 27-31 rpm pressure mixing for 18-22 s, 147-152℃ discharge to obtain a second-stage masterbatch; Mix the second-stage masterbatch, sulfur, accelerator NS and scorch retardant CTP, 28-33 rpm mixing for 23-26 s, the mixing temperature is 78-82℃, clean up, 18-22 rpm pressure mixing for 18-22 s, the mixing temperature is 89-92℃, clean up, 17-21 rpm pressure mixing for 18-22 s, 104-106℃ discharge to obtain the belt pad.

7. The application of an anti-fatigue agent in the belt pad according to claim 6, characterized in that, The mass ratio of the natural rubber, peptizer, carbon black, silica, TESPT silane coupling agent, zinc oxide, stearic acid, antioxidant 4020, antioxidant RD, anti-fatigue agent, anti-fatigue synergist, sulfur, accelerator NS and scorch retardant CTP is 100:0.10-0.12:35-38:4-6:1.0-1.2:4.8-5.3:1.4-1.7:1.4-1.6:1.8-2.2:2.4-2.7:1.7-2.0:3.8-4.2:1.6-1.8:0.44-0.

46.

8. The application of an anti-fatigue agent in the belt pad according to claim 7, characterized in that, The type of the natural rubber is natural rubber STR20; The peptizer is pentachlorothiophenol; The anti-fatigue agent is G-108, produced by Taizhou Huangyan Donghai Chemical Co., Ltd.

Images