Rubber composite material, preparation method thereof and obtained tire

Abstract

The invention discloses a rubber composite material, a preparation method thereof and an obtained tire, and belongs to the technical field of tire rubber materials. The rubber composite material comprises natural rubber, dodecyl phosphate and carbon black. The rubber composite material is applied to the aspect of tire rubber materials, solves the problem that the existing rubber composite material cannot simultaneously improve the heat generation hysteresis loss performance and the physical and mechanical properties, and adopts the dodecyl phosphate ester to effectively promote the dispersion of the carbon black, improve the mixing uniformity, improve the physical properties of the composite material and reduce the hysteresis loss, so that the tan delta of the obtained rubber composite material at 60 DEG C reaches 0.038, and the heat generation hysteresis loss can be effectively reduced. Compared with a traditional rubber composite material, the rubber composite material has the advantages that the compression heat generation reaches 12.54, the 300% stress at definite elongation reaches 15.22 Mpa, the tensile strength reaches 25.62 Mpa, the elongation at break reaches 535%, the heat generation performance, the mechanical performance and the like of the rubber composite material are obviously superior to those of the traditional rubber composite material, and the durability, the fuel-saving performance and the driving safety of the tire are effectively enhanced.

Description

Technical Field

[0001] This invention belongs to the field of tire rubber material technology, and particularly relates to a rubber composite material, its preparation method and the resulting tire. Background Technology

[0002] Rubber composite materials generate significant heat due to intramolecular friction under dynamic loads, which can accelerate tread aging and delamination, reduce tire durability, and increase tire rolling resistance, thus reducing vehicle fuel efficiency.

[0003] Currently, the above problems are usually improved by reducing the heat generation and hysteresis loss of the rubber compound. However, this leads to a decline in the physical and mechanical properties of the rubber composite, which is a key contradiction that has long existed in the rubber tire industry. Therefore, there is an urgent need to develop a rubber composite material that can simultaneously improve heat generation and hysteresis loss performance and physical and mechanical properties, so as to promote the simultaneous development of the rubber tire industry towards high durability, fuel efficiency, and high physical properties. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the technical problem to be solved by the present invention is to overcome the problem that the existing rubber composite materials cannot simultaneously improve the heat generation hysteresis loss performance and physical and mechanical properties. The present invention proposes a rubber composite material that can simultaneously improve the heat generation hysteresis loss performance and physical and mechanical properties, its preparation method and the resulting tire.

[0005] To solve the aforementioned technical problem, the technical solution adopted by the present invention is as follows: One aspect of the present invention provides a rubber composite material, comprising natural rubber, dodecyl phosphate, and carbon black.

[0006] In some embodiments, the natural rubber is Malaysian standard rubber SMR, and the carbon black is carbon black N330.

[0007] In some embodiments, the agent may also include an activator, an antioxidant, a vulcanizing agent, and a vulcanization accelerator.

[0008] In some embodiments, the mass ratio of dodecyl phosphate, natural rubber, carbon black, activator, antioxidant, vulcanizing agent, and vulcanization accelerator is 0.068-0.072:19-21:7.4-7.5:1.122-1.24:0.52-0.54:0.85-0.86:0.17-0.18.

[0009] In some embodiments, the BET of carbon black is 85m. 2 / g; the activator is a mixture of indirect zinc oxide and stearic acid; the antioxidant is a mixture of antioxidant 4020 and antioxidant RD; the vulcanizing agent is insoluble sulfur HD-OT20 grade; the vulcanization accelerator is vulcanization accelerator NS.

[0010] In some embodiments, the mass ratio of indirect zinc oxide to stearic acid in the activator is 1:0.52-0.55; the mass ratio of antioxidant 4020 to antioxidant RD in the antioxidant is 1:1.6-1.7.

[0011] In some embodiments, the rubber composite material has a tanδ of 0.038 at 60°C, a heat of compression of 12.54, a stress at 300% elongation of 15.22 MPa, a tensile strength of 25.62 MPa, and an elongation at break of 535%.

[0012] Another aspect of the present invention provides a method for preparing a rubber composite material according to any of the above-mentioned technical solutions, comprising: Dodecyl phosphate, natural rubber, carbon black, stearic acid (an active agent), and antioxidant are mixed and blended until uniform. The mixture is then extruded and pressed into sheets to obtain a masterbatch. The obtained masterbatch, zinc oxide activator, vulcanizing agent and vulcanization accelerator are mixed and compounded. After uniform mixing, the mixture is extruded and pressed into sheets to obtain the final rubber. The obtained final compound is vulcanized to obtain a rubber composite material.

[0013] In some embodiments, dodecyl phosphate, natural rubber, carbon black, activator stearic acid and antioxidant are mixed at 140-160°C for 2-4 minutes. After uniform mixing, the mixture is extruded and pressed into sheets to obtain a masterbatch. The resulting final compound was vulcanized at 151°C for 20 minutes to obtain the rubber composite material.

[0014] The present invention also provides a tire, characterized in that the tire is prepared from a rubber composite material of any of the above-mentioned technical solutions.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a rubber composite material in which dodecyl phosphate is used. The hydrophobic long-chain alkyl group of dodecyl phosphate has high compatibility with rubber. The phosphate group can react with the pyrophosphate group and aldehyde group of the natural rubber molecular chain on the one hand, and with the oxygen-containing group (such as carboxyl group) on the surface of carbon black on the other hand (carbon black can also adsorb phosphate group processing aids). This improves the dispersibility of carbon black in the natural rubber matrix and its connection stability, similar to building a "silane" of the natural rubber matrix-carbon black system. This improves the connection physicochemical stability and hysteresis stability of carbon black rubber under external force, heat and other effects, thereby simultaneously improving the physical and mechanical properties and heat generation hysteresis loss performance of the rubber composite. Detailed Implementation

[0016] The technical solutions in specific embodiments of the present invention will be described in detail and completely below. Obviously, the described embodiments are only some specific implementations of the overall technical solution of the present invention, and not all implementations. Based on the overall concept of the present invention, all other embodiments obtained by those skilled in the art fall within the protection scope of the present invention.

[0017] One aspect of the present invention provides a rubber composite material, comprising natural rubber, dodecyl phosphate, and carbon black.

[0018] The aforementioned technical solution specifies the use of natural rubber, dodecyl phosphate, and carbon black in the rubber composite material. The use of dodecyl phosphate in the rubber composite material enables it to simultaneously possess better heat generation hysteresis loss performance and physical and mechanical properties. Specifically, the hydrophobic long-chain alkyl group of dodecyl phosphate in the rubber composite material has high compatibility with rubber. The phosphate ester group can react with the pyrophosphate ester group and aldehyde group of the natural rubber molecular chain on the one hand, and with the oxygen-containing groups (such as carboxyl groups) on the surface of carbon black on the other hand (carbon black can also adsorb phosphate ester group processing aids). This improves the dispersibility of carbon black in the natural rubber matrix and its connection stability, similar to building a "silane" of a natural rubber matrix-carbon black system. This improves the connection physicochemical stability and hysteresis stability of carbon black rubber under external force and heat, thereby enhancing the physical and mechanical properties and heat generation hysteresis loss performance of the rubber composite material.

[0019] In some embodiments, the natural rubber is Malaysian standard rubber SMR, and the carbon black is carbon black N330.

[0020] The above technical solution specifies that the natural rubber is Malaysian standard rubber SMR and the carbon black is carbon black N330. The reason is that Malaysian standard rubber SMR has a high content and active aldehyde groups and low ash content, while carbon black N330 has a high content of carboxyl groups and moderate heat generation and reinforcing properties, which provides a better bridging environment for them, thereby improving the heat generation hysteresis loss performance and physical and mechanical properties of rubber composite materials.

[0021] In some embodiments, the agent may also include an activator, an antioxidant, a vulcanizing agent, and a vulcanization accelerator.

[0022] In some embodiments, the mass ratio of dodecyl phosphate, natural rubber, carbon black, activator, antioxidant, vulcanizing agent, and vulcanization accelerator is 0.068-0.072:19-21:7.4-7.5:1.122-1.24:0.52-0.54:0.85-0.86:0.17-0.18.

[0023] The above technical solution limits the mass ratio of dodecyl phosphate, natural rubber, carbon black, activator, antioxidant, vulcanizing agent, and vulcanization accelerator. The reason is that if any component in the above ratio is added in too much or too little, it will cause the heat generation hysteresis loss performance and physical and mechanical properties of the rubber composite material to deteriorate.

[0024] In some embodiments, the BET of carbon black is 85m. 2 / g; the activator is a mixture of indirect zinc oxide and stearic acid; the antioxidant is a mixture of antioxidant 4020 and antioxidant RD; the vulcanizing agent is insoluble sulfur HD-OT20 grade; the vulcanization accelerator is vulcanization accelerator NS.

[0025] In some embodiments, the mass ratio of indirect zinc oxide to stearic acid in the activator is 1:0.52-0.55; the mass ratio of antioxidant 4020 to antioxidant RD in the antioxidant is 1:1.6-1.7.

[0026] It is understandable that the mass ratio of indirect zinc oxide to stearic acid in the surfactant can also be 1:0.53, 1:0.54, or any value within the range thereof, and the mass ratio of antioxidant 4020 to antioxidant RD in the antioxidant can also be 1:1.61, 1:1.62, 1:1.63, 1:1.64, 1:1.65, 1:1.66, 1:1.67, 1:1.68, 1:1.69, or any value within the range thereof.

[0027] In some embodiments, the rubber composite material has a tanδ of 0.038 at 60°C, a heat of compression of 12.54, a stress at 300% elongation of 15.22 MPa, a tensile strength of 25.62 MPa, and an elongation at break of 535%.

[0028] Another aspect of the present invention provides a method for preparing a rubber composite material according to any of the above-mentioned technical solutions, comprising: Dodecyl phosphate, natural rubber, carbon black, stearic acid (an active agent), and antioxidant are mixed and blended until uniform. The mixture is then extruded and pressed into sheets to obtain a masterbatch. The obtained masterbatch, zinc oxide activator, vulcanizing agent and vulcanization accelerator are mixed and compounded. After uniform mixing, the mixture is extruded and pressed into sheets to obtain the final rubber. The obtained final compound is vulcanized to obtain a rubber composite material.

[0029] In the above preparation process, dodecyl phosphate, natural rubber, carbon black, stearic acid (an active agent), and antioxidant are first mixed to obtain a masterbatch. Then, the masterbatch, zinc oxide (an active agent), vulcanizing agent, and vulcanization accelerator are mixed to obtain the final compound. Instead of using stearic acid and zinc oxide simultaneously as active agents during the preparation of the masterbatch, the reason is that adding zinc oxide to the masterbatch reacts with the phosphate processing aid to generate an active agent with higher activation efficiency, increasing the vulcanization crosslinking strength of the rubber composite. This leads to a decrease in hysteresis loss heat generation properties. Simultaneously, because the active agent zinc oxide consumes dodecyl phosphate, its bonding effect with natural rubber and carbon black is severely weakened, and the carbon black dispersibility is reduced. This will lead to a decrease in the rubber composite's tensile stress, tensile strength, and other physical properties, as well as a decrease in some hysteresis loss heat generation properties.

[0030] In some embodiments, dodecyl phosphate, natural rubber, carbon black, activator stearic acid and antioxidant are mixed at 140-160°C for 2-4 minutes. After uniform mixing, the mixture is extruded and pressed into sheets to obtain a masterbatch. The resulting final compound was vulcanized at 151°C for 20 minutes to obtain the rubber composite material.

[0031] Understandably, the temperature for preparing a masterbatch can be any value within the range of 141℃, 142℃, 143℃, 144℃, 145℃, 146℃, 147℃, 148℃, 149℃, 150℃, 151℃, 152℃, 153℃, 154℃, 155℃, 156℃, 157℃, 158℃, 159℃, and so on; the mixing time can also be any value within the range of 2.5min, 3.0min, 3.5min, and so on.

[0032] The preparation method of the above-mentioned rubber composite material specifically includes the following steps: Dodecyl phosphate, natural rubber, carbon black, activator stearic acid and antioxidant are placed in a mixer and mixed at 140-160℃ for 2-4 minutes. After uniform mixing, the mixture is discharged and pressed into sheets to obtain a first-stage masterbatch. The obtained masterbatch, zinc oxide activator, vulcanizing agent and vulcanization accelerator are placed in an internal mixer, mixed evenly, and then extruded and pressed into sheets to obtain the final rubber. The obtained final compound was placed in a vulcanizing machine and vulcanized at 151°C for 20 min to obtain the rubber composite material.

[0033] The present invention also provides a tire, characterized in that the tire is prepared from a rubber composite material of any of the above-mentioned technical solutions.

[0034] The rubber composite material used to prepare tires uses dodecyl phosphate, which can make the resulting rubber composite material have a tanδ of 0.038 at 60℃, a heat of compression of 12.54, a stress at 300% elongation of 15.22 MPa, a tensile strength of 25.62 MPa, and an elongation at break of 535%. These properties are significantly better than those of traditional blank rubber composite materials in terms of heat generation hysteresis loss and mechanical properties, effectively promoting the simultaneous development of the rubber tire industry towards high durability, fuel efficiency, and high physical properties.

[0035] To provide a clearer and more detailed description of the rubber composite material, its preparation method, and the resulting tire provided in the embodiments of the present invention, the following description will be based on specific embodiments.

[0036] Example 1 Preparation of dodecyl phosphate rubber composites: 0.7 parts of dodecyl phosphate, 20 parts of natural rubber SMR, 7.4 parts of carbon black N330, 0.42 parts of activator stearic acid, 0.2 parts of antioxidant 4020 and 0.32 parts of antioxidant RD were placed in an internal mixer and mixed at 150°C for 3 minutes. After uniform mixing, the mixture was extruded and pressed into sheets to obtain a section of masterbatch. The obtained masterbatch, 0.8 parts of activator zinc oxide, 0.86 parts of vulcanizing agent insoluble sulfur HD-OT20 and 0.17 parts of vulcanization accelerator NS are placed in an internal mixer, mixed evenly, and then extruded and pressed into sheets to obtain the final rubber. The obtained final compound was placed in a vulcanizing machine and vulcanized at 151°C for 20 min to obtain the rubber composite material.

[0037] The performance of the dodecyl phosphate rubber composite material prepared in this embodiment was tested. The test standards for the composite material DMA 60℃ tanδ, compression heat generation, 300% constant elongation stress / tensile strength / elongation at break were respectively referred to GB / T9870.1-2006, GB / T1687.3-2016, and GB / T528-2009.

[0038] The results show that the dodecyl phosphate rubber composite material prepared in this embodiment has a tanδ of 0.038 at 60℃, a heat generation during compression of 12.54, a stress at 300% elongation of 15.22 MPa, a tensile strength of 25.62 MPa, and an elongation at break of 535%. These properties are significantly better than those of the traditional blank rubber composite material (i.e., Comparative Example 1 below) in terms of heat generation hysteresis loss and mechanical properties, effectively promoting the synchronous development of the rubber tire industry towards high durability, fuel efficiency, and high physical properties.

[0039] Example 2 Preparation of dodecyl phosphate rubber composites: 0.72 parts of dodecyl phosphate, 21 parts of natural rubber SMR, 7.5 parts of carbon black N330, 0.42 parts of activator stearic acid, 0.2 parts of antioxidant 4020 and 0.34 parts of antioxidant RD were placed in an internal mixer and mixed at 150°C for 3 minutes. After uniform mixing, the mixture was extruded and pressed into sheets to obtain a section of masterbatch. The obtained masterbatch, 0.8 parts of activator zinc oxide, 0.85 parts of vulcanizing agent insoluble sulfur HD-OT20 and 0.18 parts of vulcanization accelerator NS are placed in an internal mixer, mixed evenly, and then extruded and pressed into sheets to obtain the final rubber. The obtained final compound was placed in a vulcanizing machine and vulcanized at 151°C for 20 min to obtain the rubber composite material.

[0040] The performance of the dodecyl phosphate rubber composite material prepared in this embodiment was tested. The test standards for the composite material DMA 60℃ tanδ, compression heat generation, 300% constant elongation stress / tensile strength / elongation at break were respectively referred to GB / T9870.1-2006, GB / T1687.3-2016, and GB / T528-2009.

[0041] The results show that the dodecyl phosphate rubber composite material prepared in this embodiment has a tanδ of 0.036 at 60℃, a heat generation of 12.06 during compression, a stress of 14.98 MPa at 300% elongation, a tensile strength of 25.45 MPa, and an elongation at break of 557%. These properties are significantly better than those of the traditional blank rubber composite material (i.e., Comparative Example 1 below) in terms of heat generation hysteresis loss and mechanical properties, effectively promoting the synchronous development of the rubber tire industry towards high durability, fuel efficiency, and high physical properties.

[0042] Example 3 Preparation of dodecyl phosphate rubber composites: 0.68 parts of dodecyl phosphate, 19 parts of natural rubber SMR, 7.4 parts of carbon black N330, 0.44 parts of activator stearic acid, 0.2 parts of antioxidant 4020 and 0.32 parts of antioxidant RD were placed in an internal mixer and mixed at 150°C for 3 minutes. After uniform mixing, the mixture was extruded and pressed into sheets to obtain a section of masterbatch. The obtained masterbatch, 0.8 parts of activator zinc oxide, 0.86 parts of vulcanizing agent insoluble sulfur HD-OT20 and 0.17 parts of vulcanization accelerator NS are placed in an internal mixer, mixed evenly, and then extruded and pressed into sheets to obtain the final rubber. The obtained final compound was placed in a vulcanizing machine and vulcanized at 151°C for 20 min to obtain the rubber composite material.

[0043] The performance of the dodecyl phosphate rubber composite material prepared in this embodiment was tested. The test standards for the composite material DMA 60℃ tanδ, compression heat generation, 300% constant elongation stress / tensile strength / elongation at break were respectively referred to GB / T9870.1-2006, GB / T1687.3-2016, and GB / T528-2009.

[0044] The results show that the dodecyl phosphate rubber composite material prepared in this embodiment has a tanδ of 0.040 at 60℃, a heat generation of 12.97 during compression, a stress of 15.58 MPa at 300% elongation, a tensile strength of 25.97 MPa, and an elongation at break of 518%. These properties are significantly better than those of the traditional blank rubber composite material (i.e., Comparative Example 1 below) in terms of heat generation hysteresis loss and mechanical properties, effectively promoting the synchronous development of the rubber tire industry towards high durability, fuel efficiency, and high physical properties.

[0045] Comparative Example 1 Similar to Example 1, except that no dodecyl phosphate was added in the rubber composite material preparation steps. Specifically: Preparation of dodecyl phosphate rubber composites: 20 parts of natural rubber SMR, 7.4 parts of carbon black N330, 0.42 parts of activator stearic acid, 0.2 parts of antioxidant 4020 and 0.32 parts of antioxidant RD were placed in an internal mixer and mixed at 150°C for 3 minutes. After uniform mixing, the mixture was extruded and pressed into sheets to obtain a section of masterbatch. The obtained masterbatch, 0.8 parts of activator zinc oxide, 0.86 parts of vulcanizing agent insoluble sulfur HD-OT20 and 0.17 parts of vulcanization accelerator NS are placed in an internal mixer, mixed evenly, and then extruded and pressed into sheets to obtain the final rubber. The obtained final compound was placed in a vulcanizing machine and vulcanized at 151°C for 20 min to obtain the rubber composite material.

[0046] The performance of the rubber composite material prepared in this comparative example was tested. The test standards for the composite material DMA 60℃ tanδ, compression heat generation, 300% constant elongation stress / tensile strength / elongation at break were respectively referred to GB / T9870.1-2006, GB / T1687.3-2016, and GB / T528-2009.

[0047] The results showed that the rubber composite material prepared in Comparative Example 1 had a tanδ of 0.053 at 60℃, a heat of compression of 17.64, a stress at 300% constant elongation of 14.74 MPa, a tensile strength of 25.36 MPa, and an elongation at break of 433%.

[0048] Compared to rubber composites with added dodecyl phosphate, rubber composites without added dodecyl phosphate showed significant decreases in 60°C tanδ, compression heat, 300% tensile stress, and elongation at break, with tensile strength slightly lower than in the example. This is because, compared to rubber composites without added dodecyl phosphate, the hydrophobic long-chain alkyl groups in the rubber composite exhibit higher compatibility with rubber. The phosphate groups can react with the pyrophosphate and aldehyde groups of the natural rubber molecular chains, and also with oxygen-containing groups (such as carboxyl groups) on the carbon black surface (carbon black can simultaneously adsorb dodecyl phosphate), improving the dispersibility and bonding stability of carbon black in the natural rubber matrix. This is similar to building a "silane" in the natural rubber matrix-carbon black system, improving the bonding physicochemical stability and hysteresis stability of carbon black rubber under external forces and heat, thus enhancing the physical and mechanical properties of the rubber composite, including elongation at break, tensile stress, tensile strength, hysteresis loss at 60°C tanδ, and compression heat generation.

[0049] Comparative Example 2 Similar to Example 1, the difference lies in that, in the rubber composite material preparation steps, 0.8 parts of the activator zinc oxide are added together with stearic acid during the masterbatch process. Specifically: Preparation of dodecyl phosphate rubber composites: 0.7 parts of dodecyl phosphate, 20 parts of natural rubber SMR, 7.4 parts of carbon black N330, 0.42 parts of activator stearic acid, 0.8 parts of activator zinc oxide, 0.2 parts of antioxidant 4020 and 0.32 parts of antioxidant RD were placed in an internal mixer and mixed at 150°C for 3 minutes. After uniform mixing, the mixture was discharged and pressed into sheets to obtain a section of masterbatch. The obtained masterbatch, 0.86 parts of vulcanizing agent HD-OT20 insoluble sulfur and 0.17 parts of vulcanization accelerator NS were placed in an internal mixer, mixed evenly, and then extruded and pressed into sheets to obtain the final rubber. The obtained final compound was placed in a vulcanizing machine and vulcanized at 151°C for 20 min to obtain the rubber composite material.

[0050] The performance of the rubber composite material prepared in this comparative example was tested. The test standards for the composite material DMA 60℃ tanδ, compression heat generation, 300% constant elongation stress / tensile strength / elongation at break were respectively referred to GB / T9870.1-2006, GB / T1687.3-2016, and GB / T528-2009.

[0051] The results showed that the rubber composite material prepared in Comparative Example 2 had a tanδ of 0.085 at 60℃, a heat of compression of 13.60, a stress at 300% constant elongation of 9.31 MPa, a tensile strength of 23.35 MPa, and an elongation at break of 532%.

[0052] Compared to rubber composites with zinc oxide added as the activator in the final compounding, rubber composites with zinc oxide added as the activator in the masterbatch all show a decrease in tanδ at 60℃, compression heat, 300% elongation stress, and tensile strength. This is because adding zinc oxide as the activator in the masterbatch reacts with phosphate ester processing aids to generate activators with higher activation efficiency, increasing the vulcanization crosslinking strength of the rubber composite. This leads to a decrease in hysteresis loss heat generation properties. Simultaneously, because the activator zinc oxide consumes dodecyl phosphate, its bonding effect with natural rubber and carbon black is severely weakened, and the carbon black dispersibility is reduced. This results in a decrease in the rubber composite's elongation stress, tensile strength, and other physical properties, and also contributes to a decrease in some hysteresis loss heat generation properties.

[0053] Comparative Example 3 Similar to Example 1, except that in the rubber composite material preparation step, 20 parts of natural rubber SMR are replaced with 20 parts of natural rubber Vietnamese standard rubber SVR. Specifically: Preparation of dodecyl phosphate rubber composites: 0.7 parts of dodecyl phosphate, 20 parts of natural rubber (Vietnamese standard rubber SVR), 7.4 parts of carbon black N330, 0.42 parts of activator stearic acid, 0.2 parts of antioxidant 4020 and 0.32 parts of antioxidant RD were placed in an internal mixer and mixed at 150°C for 3 minutes. After uniform mixing, the mixture was extruded and pressed into sheets to obtain a section of masterbatch. The obtained masterbatch, 0.8 parts of activator zinc oxide, 0.86 parts of vulcanizing agent insoluble sulfur HD-OT20 and 0.17 parts of vulcanization accelerator NS are placed in an internal mixer, mixed evenly, and then extruded and pressed into sheets to obtain the final rubber. The obtained final compound was placed in a vulcanizing machine and vulcanized at 151°C for 20 min to obtain the rubber composite material.

[0054] The performance of the rubber composite material prepared in this comparative example was tested. The test standards for the composite material DMA 60℃ tanδ, compression heat generation, 300% constant elongation stress / tensile strength / elongation at break were respectively referred to GB / T9870.1-2006, GB / T1687.3-2016, and GB / T528-2009.

[0055] The results showed that the rubber composite material prepared in Comparative Example 1 achieved a tanδ of 0.048 at 60℃, a heat of compression of 15.06, a stress at 300% elongation of 14.87 MPa, a tensile strength of 25.40 MPa, and an elongation at break of 487%. Compared with the rubber composite material with 20 parts of natural rubber SMR, the rubber composite material with 20 parts of natural rubber SVR showed a certain degree of decrease in tanδ at 60℃, heat of compression of 15.06, stress at 300% elongation of 15.06, tensile strength, and elongation at break. This is because, compared with Malaysian standard rubber SMR, Vietnamese standard rubber SVR has lower aldehyde content and activity, and higher ash content, which weakens its reaction with dodecyl phosphate. This reduces the dispersion and bonding stability of carbon black in the natural rubber matrix, leading to a decrease in the physicochemical stability and hysteresis stability of the carbon black rubber under external forces and heat, i.e., tanδ at 60℃, heat of compression of 15.06, stress at 300% elongation of 15.06, tensile strength, and elongation at break. Of course, the slightly lower plasticity index of SVR compared to SMR also has a slight weakening effect.

Claims

1. A rubber composite material, characterized in that, Including natural gum, dodecyl phosphate, and carbon black.

2. The rubber composite material according to claim 1, characterized in that, The natural rubber is Malaysian standard rubber SMR, and the carbon black is carbon black N330.

3. The rubber composite material according to claim 1, characterized in that, It also includes surfactants, antioxidants, vulcanizing agents, and vulcanization accelerators.

4. The rubber composite material according to claim 3, characterized in that, The mass ratio of the dodecyl phosphate, the natural rubber, the carbon black, the activator, the antioxidant, the vulcanizing agent, and the vulcanization accelerator is 0.068-0.072:19-21:7.4-7.5:1.122-1.24:0.52-0.54:0.85-0.86:0.17-0.

18.

5. The rubber composite material according to claim 3, characterized in that, The BET of the carbon black is 85m. 2 / g; the activator is a mixture of indirect zinc oxide and stearic acid; the antioxidant is a mixture of antioxidant 4020 and antioxidant RD; the vulcanizing agent is insoluble sulfur HD-OT20 grade; the vulcanization accelerator is vulcanization accelerator NS.

6. The rubber composite material according to claim 5, characterized in that, The mass ratio of the indirect zinc oxide to the stearic acid in the surfactant is 1:0.52-0.55; the mass ratio of the antioxidant 4020 to the antioxidant RD in the antioxidant is 1:1.6-1.

7.

7. The rubber composite material according to claim 5, characterized in that, The rubber composite material has a tanδ of 0.038 at 60℃, a heat of compression of 12.54, a stress at 300% constant elongation of 15.22 MPa, a tensile strength of 25.62 MPa, and an elongation at break of 535%.

8. The method for preparing the rubber composite material according to any one of claims 1-7, characterized in that, include: Dodecyl phosphate, natural rubber, carbon black, stearic acid (an active agent), and antioxidant are mixed and blended until uniform. The mixture is then extruded and pressed into sheets to obtain a masterbatch. The obtained masterbatch, zinc oxide activator, vulcanizing agent and vulcanization accelerator are mixed and compounded. After uniform mixing, the mixture is extruded and pressed into sheets to obtain the final rubber. The obtained final compound is vulcanized to obtain a rubber composite material.

9. The method for preparing the rubber composite material according to claim 8, characterized in that, Dodecyl phosphate, natural rubber, carbon black, activator stearic acid and antioxidant are mixed at 140-160℃ for 2-4 minutes. After uniform mixing, the mixture is extruded and pressed into sheets to obtain a masterbatch. The resulting final compound was vulcanized at 151°C for 20 minutes to obtain the rubber composite material.

10. A tire, characterized in that, The tire is prepared from the rubber composite material according to any one of claims 1-7.