Sizing material based on bionic synthetic rubber, preparation method of sizing material and belted layer

Abstract

The invention provides a rubber material based on bionic synthetic rubber. The rubber material comprises 100 parts by weight of bionic synthetic rubber, 2-5 parts by weight of zinc oxide, 1.5-3 parts by weight of stearic acid, 2-5 parts by weight of an anti-aging agent, 0.5-2.0 parts by weight of an adhesive, 0.5-2.0 parts by weight of a resin curing agent, 50-60 parts by weight of carbon black, 8-20 parts by weight of white carbon black, 1.2-1.6 parts by weight of an accelerant and 1.9-2.6 parts by weight of a vulcanizing agent. The invention further provides a preparation method of the rubber material based on the bionic synthetic rubber and a belted layer. The invention provides a rubber material based on bionic synthetic rubber, which is suitable for a belted layer, has relatively low heat generation, and has good interface fatigue resistance when being compounded with an aramid cord thread.

Description

Technical Field

[0001] This invention relates to the field of rubber technology, and more particularly to a biomimetic synthetic rubber compound, its preparation method, and its belt layer. Background Technology

[0002] Due to the lightweight requirements of aircraft tires, nylon or aramid fibers are chosen as the carcass material for the crown belt layer of radial aircraft tires. Nylon has excellent fatigue resistance, while aramid's high modulus and low deformation mean it cannot release stress, resulting in poor fatigue resistance. Compared to bias-ply aircraft tires, radial aircraft tires have fewer ply layers and are lighter. Under high-speed, high-load conditions, the belt layer needs to restrain the tire carcass and improve tire stiffness to prevent blowouts due to insufficient strength under harsh conditions. Therefore, aramid is the optimal material for the crown belt layer carcass of radial aircraft tires.

[0003] The belt layer end of the shoulder area of ​​radial aircraft tires is the part that undergoes the largest deformation. Especially when aramid cord is used in the belt layer, the belt layer end will experience severe interlaminar shear under large tire deformation, which is a great test of the fatigue resistance of the interface between the rubber and aramid cord in the belt layer area.

[0004] To improve the fatigue resistance of the aramid cord-rubber interface, there are four main methods: First, the aramid surface is modified by cutoff and then impregnated; second, the aramid cord is etched on the surface and then coated with a coating that can adhere well to the rubber to enhance the interfacial adhesion; third, the production process of the aramid cord is optimized by increasing the twist number or optimizing the impregnation process; and fourth, the above methods are combined to comprehensively improve the fatigue resistance of the aramid cord-rubber interface.

[0005] Currently, the industry mostly uses natural rubber to manufacture high-performance aircraft tires. However, for components requiring high tack, such as belt layers, steel wire rubber, and the tire carcass, natural rubber does not have an advantage due to the influence of non-rubber components. When designing formulations, natural rubber formulations generally require the addition of tackifiers to improve the tack of specific components, ensuring sufficient bonding strength in the compound so that different components can adhere during tire manufacturing and maintain good adhesion to the reinforcing material after vulcanization. When the carbon black content in a natural rubber formulation is high, plasticizers such as oils need to be added to improve the mixing and processing performance, but this increases the heat generation of the rubber.

[0006] Therefore, it is of great significance to provide a belt layer that has low heat generation and simultaneously improves fatigue resistance at the interface with the cord. Summary of the Invention

[0007] The technical problem solved by this invention is to provide a rubber compound based on biomimetic synthetic rubber. The rubber compound provided in this application, as a belt layer compound, has low heat generation and good interfacial fatigue resistance when combined with aramid cord.

[0008] In view of this, this application provides a biomimetic synthetic rubber-based compound, comprising:

[0009] 100 parts by weight of biomimetic synthetic rubber;

[0010] 2-5 parts by weight of zinc oxide;

[0011] Stearic acid 1.5 to 3 parts by weight;

[0012] Anti-aging agent 2-5 parts by weight;

[0013] 0.5 to 2.0 parts by weight of adhesive;

[0014] 0.5~2.0 parts by weight of resin curing agent;

[0015] 50-60 parts by weight of carbon black;

[0016] 8-20 parts by weight of silica;

[0017] Accelerator 1.2~1.6 parts by weight;

[0018] Vulcanizing agent: 1.9~2.6 parts by weight.

[0019] In some specific embodiments, the biomimetic synthetic rubber is produced by reacting isoprene monomers and additives under the catalysis of a rare earth catalyst.

[0020] In some specific embodiments, the zinc oxide includes indirect zinc oxide or nano zinc oxide.

[0021] In some specific embodiments, the antioxidant includes one or more of p-phenylenediamine antioxidants and quinoline antioxidants.

[0022] In some specific embodiments, the adhesive comprises a phenolic resin adhesive, and / or the resin curing agent comprises hexamethoxymethyl melamine or SL-RA65.

[0023] In some specific embodiments, the silica is precipitated silica or fumed silica, and the specific surface area of ​​the silica is 165~180 m². 2 / g.

[0024] In some specific embodiments, the carbon black is medium-low reinforcing carbon black, and / or the accelerator is a sulfenamide accelerator, and / or the vulcanizing agent is sulfur powder or insoluble sulfur.

[0025] This application also provides a method for preparing the aforementioned adhesive compound, comprising the following steps:

[0026] According to the component ratio, biomimetic synthetic rubber, zinc oxide, stearic acid, antioxidant, adhesive, silica and carbon black are initially mixed to obtain a first-stage compound.

[0027] The first-stage compound, resin curing agent, accelerator and vulcanizing agent are finally mixed to obtain the rubber compound.

[0028] In some specific embodiments, the initial mixing feed temperature is 50~60℃, the filling coefficient is 65~70%, the discharge temperature is 160~170℃, and / or, the final mixing feed temperature is 50~60℃, and the discharge temperature is 100~110℃.

[0029] This application provides a belt layer, the raw material of which includes a rubber compound, wherein the rubber compound is the rubber compound described in the above-described scheme or the rubber compound prepared by the preparation method described in the above-described scheme.

[0030] This application provides a rubber compound based on biomimetic synthetic rubber, which includes specific amounts of biomimetic synthetic rubber, zinc oxide, stearic acid, antioxidant, adhesive, resin curing agent, carbon black, silica, accelerator, and vulcanizing agent. In the rubber compound provided in this application, by introducing biomimetic synthetic rubber and combining it with other components in a specific ratio, the resulting rubber compound, as a belt layer compound, has low heat generation and good interfacial fatigue resistance with aramid cords. Furthermore, its strength, elongation at break, hardness, and adhesion performance with aramid cords all meet the requirements. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of dynamic fatigue life testing of rubber-aramid cord in an embodiment of the present invention. Detailed Implementation

[0032] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims of the present invention.

[0033] Given the inherent limitations of aramid fibers in existing technologies, which restrict the improvement of fatigue resistance at the rubber-aramid cord interface, this invention provides a biomimetic synthetic rubber compound suitable for fatigue-resistant, low-heat-generating bundle layers of aramid cords. This compound exhibits low heat generation and good interfacial fatigue resistance, solving the problems of poor processability of the bundle layer and poor interfacial performance with aramid cords. An embodiment of this invention discloses a biomimetic synthetic rubber compound comprising:

[0034] 100 parts by weight of biomimetic synthetic rubber;

[0035] 2-5 parts by weight of zinc oxide;

[0036] Stearic acid 1.5 to 3 parts by weight;

[0037] Anti-aging agent 2-5 parts by weight;

[0038] 0.5 to 2.0 parts by weight of adhesive;

[0039] 0.5~2.0 parts by weight of resin curing agent;

[0040] 50-60 parts by weight of carbon black;

[0041] 8-20 parts by weight of silica;

[0042] Accelerator 1.2~1.6 parts by weight;

[0043] Vulcanizing agent: 1.9~2.6 parts by weight.

[0044] In the biomimetic synthetic rubber compound provided in this application, the biomimetic synthetic rubber serves as the main rubber, which is prepared by reacting isoprene monomers and additives under the catalysis of a rare earth catalyst. The additives are modified phospholipids obtained by reacting alkyl aluminum and phospholipids. The alkyl aluminum is trialkyl aluminum or hydrogenated alkyl aluminum, and the phospholipid is selected from one or more of lecithin, phosphatidylinositol, glycerophosphates, glycerophosphorylcholine, and long-chain alkyl phosphates. The additives are prepared as follows: under a protective atmosphere, the alkyl aluminum is dissolved in hexane, and the phospholipid is added and reacted at 50-100°C for 1-12 hours. The reaction of the alkyl aluminum and phospholipids... The molar ratio is (1~10):1, the amount of the auxiliary agent is 0.5~2% of the mass of the isoprene monomer, and the rare earth catalyst is prepared by mixing rare earth compounds, organoaluminum compounds and chlorides in a solvent; the rare earth compounds are one or more of rare earth carboxylates, rare earth acidic phosphonates, alkoxy rare earths, rare earth chloride electron donor complexes and sulfonate rare earth electron donor complexes, the organoaluminum compounds are trialkylaluminum and / or alkyl aluminum hydride, and the chlorides are one or more of diisobutylaluminum chloride, diethylaluminum chloride, sesquiethylaluminum chloride, tert-butyl chloride, benzyl chloride, allyl chloride, chloromethylsilane and silicon tetrachloride.

[0045] The biomimetic synthetic rubber prepared according to the above method mainly has a cis-1,4-structure, and molecular linking modification is carried out during the polymerization stage.

[0046] The zinc oxide includes indirect zinc oxide or nano zinc oxide. In a specific embodiment, the zinc oxide is selected from nano zinc oxide. The content of the zinc oxide is 2 to 5 parts by weight, specifically, the content of the zinc oxide is 3 parts by weight or 4 parts by weight.

[0047] The content of stearic acid is 1.5 to 3 parts by weight, specifically, the content of stearic acid is 2 parts by weight or 2.5 parts by weight.

[0048] The antioxidant includes one or more of p-phenylenediamine antioxidants and quinoline antioxidants. Specifically, the antioxidant is selected from one or two of p-phenylenediamine antioxidants and quinoline antioxidants. The p-phenylenediamine antioxidant is selected from one or two of 4010NA and 4020, and the quinoline antioxidant is selected from RD and BLE-W. In a specific embodiment, the antioxidant is selected from a mixture of BLE-W and 4010NA. The content of the antioxidant is 2-5 parts by weight, specifically 3 parts by weight or 4 parts by weight. In a specific embodiment, BLE-W and 4010N are mixed in a 1:1 mass ratio, totaling 2 parts by weight.

[0049] The adhesive includes a phenolic resin adhesive, specifically, the adhesive can be selected from SL-3020 or SL-3022, and its content is 0.5~2.0 parts by weight, specifically, the content of the adhesive is 1.0 parts by weight or 1.5 parts by weight. Excessive content of the adhesive will reduce the fatigue resistance of the rubber compound-aramid cord interface.

[0050] The resin curing agent includes hexamethoxymethylmelamine (HMMM) or SL-RA65. In a specific embodiment, the resin curing agent is selected from SL-RA65. The content of the resin curing agent is 0.5 to 2.0 parts by weight, specifically, 0.65 to 1.95 parts by weight, and more specifically, 0.97 to 1.5 parts by weight. The above content is the effective content of the resin curing agent. In a specific embodiment, the resin curing agent is SL-RA65 with a purity of 65%, and the actual amount of resin curing agent used is the converted amount (total amount of SL-RA65 × 65%). Further, for pure hexamethoxymethylmelamine (HMMM), the mass ratio of the resin curing agent to the adhesive is 1:1. For SL-RA65 with a purity of 65%, the converted mass ratio of SL-RA65 to the adhesive is 1.5:1.

[0051] The carbon black is a medium-low reinforcing carbon black, which may include one or more of N330, N550, and N660. Specifically, the carbon black is selected from one or more of N330, N550, and N660, and more specifically, the carbon black is selected from N330. The content of the carbon black is 50-60 parts by weight, specifically 52-58 parts by weight, and more specifically, 53-55 parts by weight. The amount of carbon black added within the above range ensures that the tensile properties and heat generation properties of the rubber compound meet the requirements. However, if the amount of carbon black is too low, the modulus of the vulcanizate will decrease; if the amount of carbon black is too high, the heat generation of the vulcanizate will increase.

[0052] The silica is precipitated silica or fumed silica, with a specific surface area of ​​165~180 m². 2 / g, specifically, the silica is precipitated silica. The content of silica is 8-20 parts by weight, specifically, the content of silica is 10-18 parts by weight, more specifically, the content of silica is 12-16 parts by weight; the silica can increase the interfacial dynamic fatigue resistance of the rubber compound and aramid cord, and it can also be used as an adhesive, but excessive addition will lead to uneven performance of the rubber compound.

[0053] The accelerator includes sulfenamide accelerators, such as one or more of DZ, CZ, and NS. In a specific embodiment, the accelerator is selected from NS. The content of the accelerator is 1.2 to 1.6 parts by weight, specifically, the content of the accelerator is 1.4 to 1.5 parts by weight.

[0054] The vulcanizing agent includes sulfur powder or insoluble sulfur. Specifically, the vulcanizing agent is selected from insoluble sulfur, and more specifically, the vulcanizing agent is selected from HD-OT20, wherein the sulfur content is 80%. The content of the vulcanizing agent (based on sulfur content) is 1.9~2.6 parts by weight. In a specific embodiment, the vulcanizing agent is insoluble sulfur with a sulfur content of HD-OT20, and its content (based on sulfur content) is 1.92~2.56 parts by weight. Specifically, the content of the vulcanizing agent (based on sulfur content) is 2.24~2.4 parts by weight. The actual amount of vulcanizing agent used is the converted amount (total amount of HD-OT20 × 80%).

[0055] Furthermore, this application also provides a method for preparing the above-mentioned rubber compound, comprising the following steps:

[0056] According to the component ratio, biomimetic synthetic rubber, zinc oxide, stearic acid, antioxidant, adhesive, silica and carbon black are initially mixed to obtain a first-stage compound.

[0057] The first-stage compound, resin curing agent, accelerator and vulcanizing agent are finally mixed to obtain the rubber compound.

[0058] In the preparation process of the above-mentioned rubber compound, the initial mixing feed temperature is 50~60℃, the filling coefficient is 65~70%, and the discharge temperature is 160~170℃. The final mixing feed temperature is 50~60℃, and the discharge temperature is 100~110℃. After the first-stage mixed rubber is prepared, it is left to stand for at least 8 hours before proceeding to the next process.

[0059] More specifically, the method for preparing the adhesive compound includes the following steps:

[0060] The first stage of mixing is carried out in an internal mixer, maintaining a filler ratio between 65% and 75%, a rotation speed of 40 rpm, and a feed temperature below 60°C. After the internal mixer reaches the set temperature, biomimetic synthetic rubber is added first, and the top plug is pressed up and mixed for 60 seconds. Then, the plug is lifted and the traditional Chinese medicine (zinc oxide, stearic acid, antioxidant, and binder), silica, and half carbon black are added. The top plug is pressed up and mixing continues for 60 seconds. Subsequently, the remaining half carbon black is added and the plug is pressed up and mixing continues for 60 seconds. The plug is then lifted and the material is swept away. Mixing continues for 300 seconds or until the temperature reaches 165°C, at which point the rubber is discharged. The discharged rubber compound is cooled and sheeted on two drop pans in an open mill to obtain a first stage of mixed rubber sheet. After being left to stand for at least 8 hours, the next process is carried out.

[0061] The final mixing continues in the internal mixer at a speed of 20 rpm and a feed temperature below 60°C. Once the internal mixer meets the above conditions, a batch of mixed rubber sheet and small additives (including resin curing agent, accelerator, and sulfur) are added. The top plug is pressed and mixed for 60 seconds, then the plug is lifted to sweep the material. The plug is then pressed again and mixing continues until 180 seconds are reached or the temperature reaches 105°C for discharge. The discharged rubber is then cooled and sheeted in an open mill.

[0062] Furthermore, this application also provides a belt layer whose raw material includes an adhesive, wherein the adhesive is the adhesive described in the above-mentioned scheme.

[0063] The above-mentioned rubber compound, as a formulation material for the belt layer, exhibits excellent fatigue resistance at the interface with aramid cord, low heat generation, and good interfacial adhesion.

[0064] To further understand the present invention, the following detailed description, in conjunction with embodiments, provides the biomimetic rubber-based compound adhesive, its preparation method, and its application. The scope of protection of the present invention is not limited by the following embodiments.

[0065] Unless otherwise specified, the raw materials used in the following examples and comparative examples are all commercially available products.

[0066] Comparative Example 1: Preparation of a belt layer formulation adhesive based on smoked sheet adhesive

[0067] Before using #1 smoked sheet adhesive, it should be plasticized, with Mooney temperature controlled at 60±5, and left to stand for 4 hours before use;

[0068] The first stage of mixing is carried out in an internal mixer, maintaining a filling factor between 65 and 70%, a rotation speed of 35 to 45 rpm, and a feed temperature of 50 to 60°C. Rubber is added, and the top plug is pressed up for 90 seconds. Zinc oxide, stearic acid, antioxidant, adhesive resin, tackifying resin, silica, and half carbon black are added after the top plug is pressed up for 60 seconds. The remaining carbon black is added after the plug is lifted, and mixing continues. After mixing for 60 seconds, the plug is lifted to sweep the material and cool down. The mixing is then repeated. When the temperature reaches 165°C, the rubber is discharged. The discharged rubber compound is cooled and sheeted on two drop pans in an open mill. After standing for at least 8 hours, a first stage of mixed rubber sheet is obtained, which is then used for the next process.

[0069] The final mixing continues in the internal mixer at a speed of 20 rpm and a feed temperature below 60°C. Once the internal mixer meets the above conditions, a batch of mixed rubber sheet and small additives (including resin curing agent, accelerator, and sulfur) are added. The top plug is pressed and mixed for 60 seconds, then the plug is lifted to sweep the material. The plug is then pressed again and mixing continues until 180 seconds are reached or the temperature reaches 105°C for discharge. The discharged rubber is then cooled and sheeted in an open mill.

[0070] Preparation of Bionic Rubber-Based Belt Layer Formulations (Comparative Examples 2-6, Examples 1-10)

[0071] The first stage of mixing is carried out in an internal mixer, maintaining a filling factor between 65 and 70%, a rotation speed of 35 to 45 rpm, and a feed temperature of 50 to 60°C. Biomimetic synthetic rubber is added, and the top plug is pressed up for 90 seconds. Zinc oxide, stearic acid, antioxidant, adhesive resin, silica, and half carbon black are added after the top plug is pressed up for 60 seconds. The remaining carbon black is added after the plug is lifted, and mixing continues. After mixing for 60 seconds, the plug is lifted to sweep the material and cool down. The mixing is then repeated. When the temperature reaches 165°C, the rubber is discharged. The discharged rubber is then cooled and sheeted on two trays in an open mill. After being left to stand for at least 8 hours, the next process is carried out.

[0072] The final mixing process continues in an internal mixer at 20 rpm with a feed temperature below 60°C. Once the internal mixer meets these conditions, a batch of compounded rubber sheets and additives (including resin curing agent, accelerator, and sulfur) are added. The top plug is pressed and the mixture is mixed for 60 seconds. Then, the plug is lifted to sweep away the material, and the plug is pressed again to continue mixing. This process continues until 180 seconds are reached or the temperature reaches 105°C, at which point the rubber is discharged. The discharged rubber is then cooled and sheeted in an open mill to obtain the final compounded rubber.

[0073] The final compound was vulcanized at 145°C, and the vulcanization time was based on the vulcanization curve tc100 (excluding rubber-cord test samples).

[0074] The preparation methods of the biomimetic synthetic rubber in the above embodiments and comparative examples are as follows:

[0075] In a nitrogen-protected environment, 20 mL of 0.0005 mol / L rare earth compound, 50 mL of 0.006 mol / L alkylaluminum n-hexane solution, and 4 mL of 0.0005 mol / L chloride hexane solution were added to the reactor to prepare a 0.00005 mol / L rare earth catalyst. The reaction was carried out at 80 °C for 30 min to obtain the rare earth catalyst required for the preparation of radioactive synthetic rubber.

[0076] Under nitrogen protection, 0.01 mol of phospholipid was added to 100 mL of a 0.5 mol / L alkylaluminum hexane solution, and the reaction was carried out at 70 °C for 60 min to obtain modified phospholipid. Under nitrogen atmosphere, 5 L of an 80 g / L isoprene monomer hexane solution was added to a polymerization reactor, along with 240 mL of the rare earth catalyst prepared above. After reacting for 10 min, the modified phospholipid (1.0% wt of monomer) was added, and the reaction was carried out at 20 °C ± 2 °C for 18 h. A terminator was then added to continue the reaction. The reaction should last 60 minutes. After the reaction is complete, add defoamer to the latex and recover unreacted monomers and solvents by high-pressure steam stripping. At the same time, add 4 mL of 3% sodium hydroxide solution for coagulation and stirring, and control the coagulation temperature at 90~95℃. Finally, coagulate the latex into particles about the size of rice grains. The coagulated liquid is basically clear. Spread the coagulated rubber particles evenly on a sieve and dry them in an oven at 105℃. After drying, the volatile content of the sample is less than 0.5%. After drying, let the rubber particles cool to room temperature to obtain biomimetic synthetic rubber for later use.

[0077] The raw material composition tables of the formulations prepared in the above embodiments and comparative examples are shown in Tables 1 and 2.

[0078] The formulations prepared in the above examples and comparative examples were subjected to performance tests, and the results are shown in Tables 3 and 4.

[0079] The test items and basis for the fatigue-resistant low-grossness tropical bundle layer formulation based on biomimetic synthetic rubber are as follows:

[0080] 1) Tensile strength, elongation at break, 300% elongation: According to standard GB / T 528-2009, a type 1 cutter was used, the gauge length was 25mm, the tensile speed was 500mm / min, and a Zwick Z005 tensile testing machine with an optical extensometer was used.

[0081] 2) Hardness: According to the national standard GB / T 2411-2008, the Shore A hardness tester was used to test samples with a thickness greater than 6mm;

[0082] 3) Heat generation: Tested according to GB / T1687.3-2016 standard, constant temperature chamber temperature 55℃, stroke 5.71mm, prestress 1.0MPa conditions;

[0083] 4) H-type static pull-out force: According to standard GB / T 2942-2009, 3300dtex / 2 aramid dipped cord was used, the cord was buried at a depth of 8mm, the sample vulcanization time was 60min, and the tensile speed was 100mm / min using a Shimadzu tensile testing machine.

[0084] 5) Dynamic fatigue life of rubber-aramid cord: Samples were prepared using 3300 dtex / 2 aramid impregnated cord, and the test samples were as follows. Figure 1 As shown, the sample vulcanization time was 60 min, the test temperature was 80℃, the preheating time was 20 min, the load range was 5N-55N, the frequency was 5Hz, and the number of cycles after one end of the aramid cord was completely pulled out was the fatigue life of the corresponding sample.

[0085] Table 1. Composition data (parts by weight) of the formulated adhesive prepared in the comparative example.

[0086]

[0087] Table 2. Composition data (parts by weight) of the formulated adhesive prepared in the examples.

[0088]

[0089] Table 3. Physical property data of the belt layer formulations prepared in the comparative examples.

[0090]

[0091] Table 4. Physical property data of the belt layer formulation adhesive prepared in the examples.

[0092]

[0093] Comparative Example 1 is a belt layer formulation for radial-structure aircraft tires suitable for aramid / nylon cord skeleton materials. Compared with Comparative Example 1, Example 1 shows a slight decrease in heat generation, a significant increase in H-type static pull-out force, and superior dynamic fatigue resistance of the rubber-aramid cord. Although tackifying resin is added to the natural rubber belt layer formulation, the adhesion between the rubber compound and the aramid cord is still inferior to that of the biomimetic synthetic rubber formulation. This is mainly because the non-rubber components in the natural rubber reduce the tackiness of the compound.

[0094] In Examples 1, 2, and 3, the amount of carbon black added was within a certain range, and the tensile properties and heat generation properties met the performance requirements of aviation tire belt layer formulations. In Comparative Example 2, the amount of carbon black was too low, and the modulus of the formulation vulcanized rubber was too low. Under high speed and high load, this would lead to increased belt layer deformation and increased heat generation, which would not be conducive to the transition of high-modulus aramid cords to the rubber in the lower tread area.

[0095] Compared with Comparative Example 3, Examples 2, 4, and 5 all showed good fatigue resistance at the rubber-aramid cord interface, with no significant difference in tensile and heat generation properties. In the formulation, the dynamic fatigue resistance of the rubber-aramid cord interface improved with increasing dosage of precipitated silica. Since no silane coupling agent was added to the formulation, silica was used as a binder in the current formulation. When the dosage was too high, silica in the rubber compound was prone to agglomeration, leading to uneven rubber compound properties.

[0096] Compared with Comparative Example 4, Examples 2, 6, 7, and 8 show that the addition of 5 parts by weight of adhesive resin in Comparative Example 4 increased heat generation, improved the modulus of the rubber compound, and improved static adhesive performance, but decreased dynamic adhesive fatigue. This is mainly because the increased amount of adhesive resin allows the adhesive resin to react with the resin curing agent at high temperature, forming an interpenetrating network with the vulcanization crosslinking network, which increases the modulus of the vulcanized rubber and decreases the fatigue resistance of the rubber-aramid cord interface.

[0097] Compared with Comparative Examples 5 and 6, Examples 8 and 9 show that the accelerator and vulcanizate are within a normal range. When the accelerator content is low (as in Comparative Example 5), the vulcanization speed is slower, the interfacial adhesion between the rubber compound and the aramid cord is worse, and the dynamic and static properties are generally reduced. When the vulcanizate content is too high (as in Comparative Example 6), the crosslinking density is too high, the strength and elongation at break are significantly reduced, and the dynamic properties of the rubber-aramid cord interface are reduced.

[0098] Based on the above experimental results, the tensile and heat-generating properties of the vulcanized rubber formulation in the examples meet the usage requirements, and it also exhibits good interfacial properties with aramid cord. The overall performance of the examples is superior to that of the comparative examples. Therefore, the belt layer formulation prepared based on biomimetic rubber has low heat generation while exhibiting good interfacial fatigue resistance with aramid cord.

[0099] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0100] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rubber compound based on biomimetic synthetic rubber, comprising: 100 parts by weight of biomimetic synthetic rubber; 2-5 parts by weight of zinc oxide; Stearic acid 1.5 to 3 parts by weight; Anti-aging agent 2-5 parts by weight; 0.5 to 2.0 parts by weight of adhesive; 0.5~2.0 parts by weight of resin curing agent; 50-60 parts by weight of carbon black; 8-20 parts by weight of silica; Accelerator 1.2~1.6 parts by weight; Vulcanizing agent: 1.9~2.6 parts by weight.

2. The adhesive compound according to claim 1, characterized in that, The biomimetic synthetic rubber is produced by reacting isoprene monomers and additives under the catalysis of a rare earth catalyst.

3. The adhesive compound according to claim 1, characterized in that, The zinc oxide includes indirect zinc oxide or nano zinc oxide.

4. The adhesive compound according to claim 1, characterized in that, The antioxidants include one or more of p-phenylenediamine antioxidants and quinoline antioxidants.

5. The adhesive compound according to claim 1, characterized in that, The adhesive includes a phenolic resin adhesive, and / or the resin curing agent includes hexamethoxymethyl melamine or SL-RA65.

6. The adhesive compound according to claim 1, characterized in that, The silica is precipitated silica or fumed silica, and the specific surface area of ​​the silica is 165~180 m². 2 / g.

7. The adhesive compound according to claim 1, characterized in that, The carbon black is medium-low reinforcing carbon black, and / or the accelerator is a sulfenamide accelerator, and / or the vulcanizing agent is sulfur powder or insoluble sulfur.

8. A method for preparing the rubber compound according to any one of claims 1 to 7, comprising the following steps: According to the component ratio, biomimetic synthetic rubber, zinc oxide, stearic acid, antioxidant, adhesive, silica and carbon black are initially mixed to obtain a first-stage compound. The first-stage compound, resin curing agent, accelerator and vulcanizing agent are finally mixed to obtain the rubber compound.

9. The preparation method according to claim 8, characterized in that, The initial mixing process has a feed temperature of 50-60℃, a filling coefficient of 65-70%, and a discharge temperature of 160-170℃, and / or the final mixing process has a feed temperature of 50-60℃ and a discharge temperature of 100-110℃.

10. A belt layer, the raw material comprising a rubber compound, characterized in that, The adhesive is the adhesive according to any one of claims 1 to 7 or the adhesive prepared by the preparation method according to any one of claims 8 to 9.

Images