An organic cobalt salt for improving the tensile strength of rubber and its preparation method
The organic cobalt salt synthesized by organosilicon plant fatty acids and a specific preparation method solves the problem of traditional cobalt salts reducing the tensile strength of rubber, achieving a balance between high tensile strength and excellent adhesive properties, and reducing production energy consumption and costs.
Patent Information
- Application Number
- CN202610429796.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-02
- Publication Date
- 2026-05-26
AI Technical Summary
While traditional cobalt salts improve the adhesive properties of rubber, they significantly reduce its tensile strength, making it difficult to achieve a balance between excellent adhesion and high tensile strength in formulation design.
Using organosilicon plant fatty acids, propionic acid, solvents, and cobalt hydroxide as raw materials, organocobalt salts are synthesized through a specific preparation method. Ethoxysilane groups are introduced to improve adhesive properties, and production energy consumption is reduced through Diels-Alder cycloaddition reaction. Rosin skeleton and maleimide ring are used to improve the rigidity and chemical bonding of rubber.
It effectively improves the tensile strength of rubber, reduces production costs, ensures adhesion performance while extending scorch time, prevents interfacial brittle fracture, and improves the overall performance of rubber composite materials.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of rubber technology, specifically to an organic cobalt salt for improving the tensile strength of rubber and its preparation method. Background Technology
[0002] In the rubber industry, especially in rubber products reinforced with metal skeletons, cobalt salts have long held an irreplaceable position as key adhesion promoters.
[0003] However, the application of traditional cobalt salts has significant technical limitations. Although cobalt ions perform excellently in improving adhesive properties, they have a significant negative impact on the physical and mechanical properties of the rubber matrix after vulcanization, especially tensile strength.
[0004] This contradiction leads to a dilemma in formulation design when faced with dual requirements: on the one hand, a metal framework is needed to provide support and cobalt salts are required to ensure interfacial adhesion; on the other hand, the high tensile strength requirements of the finished product must be met. To address this issue, existing technologies typically require the addition of extra auxiliary agents to the formulation to compensate for the loss of tensile properties, or complex process adjustments to balance the relationship between adhesion and strength. This not only increases the difficulty and complexity of formulation design but may also lead to increased costs and uncontrollable synergistic or antagonistic effects between various additives, making it difficult to simultaneously optimize both adhesion and tensile strength.
[0005] Therefore, there is an urgent need to develop an organic cobalt salt that can improve the tensile strength of rubber, so that it can effectively enhance the tensile strength of rubber while maintaining excellent adhesion promoting function. Summary of the Invention
[0006] The purpose of this invention is to provide an organic cobalt salt for improving the tensile strength of rubber and its preparation method, so as to solve the technical problems mentioned in the background art.
[0007] The technical solution to achieve the objective of this invention is: In a first aspect, the present invention provides an organic cobalt salt for improving the tensile strength of rubber, wherein the raw material components, by mass parts, include 140-210 parts by mass of organosilicon vegetable fatty acid, 10-16 parts by mass of propionic acid, 20-30 parts by mass of solvent, and 20-30 parts by mass of cobalt hydroxide.
[0008] Furthermore, the organosilicon plant fatty acids are obtained by reacting rosin with organosilicon maleimide as raw materials.
[0009] Furthermore, the organosilicon maleimide is prepared by reacting maleic anhydride with a silicon-containing long-chain aliphatic amine.
[0010] Furthermore, the silicon-containing long-chain aliphatic amine is obtained by reacting methyldiethoxysilane with an unsaturated long-chain aliphatic amine.
[0011] Furthermore, the unsaturated long-chain fatty amine includes 9-decen-1-amine.
[0012] In a second aspect, a method for preparing an organocobalt salt for improving the tensile strength of rubber as described in the first aspect, the preparation steps including: (1) Weigh and mix each raw material component; (2) Add organosilicon plant fatty acids into the reactor and heat to melt for later use; (3) Preheat the solvent to 50°C, then add cobalt hydroxide and stir to disperse for at least 30 minutes to obtain a suspension; (4) Add propionic acid to the reactor in step (2) and stir evenly. Then add the suspension and heat to 90~100℃. After keeping the temperature for 2 hours, heat to 150~160℃ and keep it for 2 hours. Then remove the wastewater and excess propionic acid. Then heat to 175℃~185℃ and remove the solvent by vacuum distillation. After cooling the discharged material, the organic cobalt salt is obtained.
[0013] Further, the preparation steps of the organosilicon plant fatty acids are as follows: Under nitrogen protection, 60 parts by weight of scraped and ground premium rosin are heated to 150-160°C to melt, then 84-86 parts by weight of organosilicon maleimide are added and reacted at 180-190°C for 3-4 hours, then cooled to 70-80°C, and 125-126 parts by weight of glacial acetic acid are added. The temperature is maintained at 115-125°C and refluxed for 50-70 minutes to obtain organosilicon plant fatty acids; the specific reaction process is as follows: .
[0014] Further, the preparation steps of the organosilicon maleimide are as follows: Under nitrogen protection, 1 part by mass of maleic anhydride is dissolved in 46-47 parts by mass of N,N-dimethylformamide, then 3.5-3.6 parts by mass of a silicon-containing long-chain aliphatic amine is added and the mixture is stirred at room temperature for 1-3 hours. Then, 0.72-0.73 parts by mass of pyridine is added, and the mixture is heated to 120-140°C and refluxed for 2-4 hours within 4 hours to obtain the organosilicon maleimide. The specific reaction process is as follows: .
[0015] Further, the preparation steps of the silicon-containing long-chain aliphatic amine are as follows: Under nitrogen protection, the catalyst and unsaturated long-chain aliphatic amine are mixed at a mass ratio of 1:(10~20), then heated to 70~75℃, refluxed for 140~160 min, and then isopropanol is removed by vacuum distillation at 75℃ to obtain mixture A; then methyldiethoxysilane is added to the reaction vessel, stirred and heated to 70℃, and then mixture A is added dropwise. After the dropwise addition is completed, the temperature is raised to 90~110℃ and held for 6~8 h; finally, unreacted unsaturated long-chain aliphatic amine is removed by vacuum distillation to obtain the silicon-containing long-chain aliphatic amine; the molar ratio of methyldiethoxysilane to unsaturated long-chain aliphatic amine is 1:(1.1~1.3); the specific reaction process is as follows: .
[0016] Furthermore, the catalyst is obtained by compounding chloroplatinic acid and isopropanol at a mass ratio of 1:99.
[0017] By adopting the above technical solution, the present invention has the following beneficial effects: (1) The organic cobalt salt for improving the tensile strength of rubber of the present invention is made from organic silicon plant fatty acids, propionic acid, solvent and cobalt hydroxide. The organic cobalt salt not only maintains the excellent adhesion promoting function, but also effectively improves the tensile strength of rubber.
[0018] (2) The preparation process of the organosilicon plant fatty acid of the present invention is as follows: First, methyl diethoxysilane and unsaturated long-chain fatty amine are reacted with hydrosilylation to obtain a silicon-containing long-chain fatty amine with both inorganic silicon-oxygen skeleton and organic long-chain characteristics; then, maleic anhydride is reacted with the amino group in the silicon-containing long-chain fatty amine to generate organosilicon maleimide; finally, organosilicon plant fatty acid is obtained by means of the Diels-Alder cycloaddition reaction between rosin and organosilicon maleimide; by introducing organosilicon maleimide containing long fatty chains, the softening point of organosilicon plant fatty acid can be effectively reduced, so that when preparing organocobalt salt with cobalt source in the subsequent process, there is no need to use special high-temperature and high-energy-consumption process, and the reaction can be completed efficiently under conventional process parameters, which fundamentally solves the problem of increased production energy consumption caused by excessively high melting point of precursor.
[0019] (3) The organosilicon plant fatty acid of the present invention uses rosin as the core raw material. With the natural advantages of rosin being widely available and inexpensive, it not only significantly reduces production costs but also fits the concept of low-carbon and environmentally friendly sustainable development.
[0020] (4) The ethoxysilane group introduced at the end of the organocobalt salt molecule of the present invention has the following advantages: First, the ethoxysilane group has excellent hydrophilicity and reactivity. During the processing of the rubber compound, the ethoxysilane group can preferentially adsorb and capture the free water remaining in the matrix, convert it into silanol or participate in the condensation reaction, effectively reducing the concentration of water on the steel wire surface, avoiding the erosion and damage of the bonding interface by water molecules, thereby constructing a dry and stable micro-bonding environment, laying the foundation for the formation of high-strength chemical bonds; Second, the introduction of the ethoxysilane group can delay vulcanization, thereby prolonging the scorch time, and thus ensuring that the rubber compound maintains good fluidity in the early stage of resin network formation. This not only promotes the full migration and penetration of the rubber matrix to the steel wire surface, but also effectively inhibits the Cu in the bonding interface layer. x Excessive growth of the S layer prevents interfacial brittleness caused by excessive thickness of the CuxS layer, further optimizing adhesion performance.
[0021] (5) When the organosilicon plant fatty acid obtained by the present invention is applied to rubber, the rigid rosin skeleton and maleimide ring in the organosilicon plant fatty acid act as hard micro-regions, which play a role similar to "physical cross-linking points" and restrict the slippage of rubber molecular chains. The terminal ethoxysilane functional group can be hydrolyzed to generate silanol during processing, which then forms a strong chemical bond with the rubber matrix or inorganic filler surface, enhancing the interfacial bonding force. The central cobalt ion acts as a highly efficient adhesion promoter, which can catalyze the chemical cross-linking between rubber and metal skeleton materials. Through the synergistic effect of "rigid skeleton support + interfacial chemical bonding + cobalt ion catalysis", the tensile strength of rubber composite material is significantly improved. Detailed Implementation
[0022] To better understand the above technical solution, the following will provide a detailed explanation of the technical solution in conjunction with specific implementation methods.
[0023] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.
[0024] The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and should not be used to limit the scope of protection of the present invention.
[0025] The solvent used is n-butyl propionate, which is a byproduct of our existing projects, thus achieving comprehensive utilization of resources.
[0026] The unsaturated long-chain fatty amine is 9-decen-1-amine. Example 1
[0027] A method for preparing an organocobalt salt to improve the tensile strength of rubber, comprising the following steps: (1) Weigh and mix the raw materials: 140 parts by weight of organosilicon vegetable fatty acid, 10 parts by weight of propionic acid, 20 parts by weight of solvent, and 20 parts by weight of cobalt hydroxide; (2) Add organosilicon plant fatty acids into the reactor and heat to melt for later use; (3) Preheat the solvent to 50°C, then add cobalt hydroxide and stir to disperse for at least 30 minutes to obtain a suspension; (4) Add propionic acid to the reactor in step (2) and stir evenly. Then add the suspension and heat to 90°C. After keeping the temperature for 2 hours, heat to 150°C and keep for 2 hours. Then remove the wastewater and excess propionic acid. Then heat to 175°C and remove the solvent by vacuum distillation. Discharge and cool to obtain organic cobalt salt.
[0028] The preparation steps of the organosilicon plant fatty acid are as follows: Under nitrogen protection, 60 parts by mass of scraped and ground premium rosin are heated to 150°C to melt, and then 84 parts by mass of organosilicon maleimide are added and reacted at 180°C for 4 hours. Then the temperature is lowered to 70°C, 125 parts by mass of glacial acetic acid are added, the temperature is maintained at 115°C, and refluxed for 70 minutes to obtain organosilicon plant fatty acid.
[0029] The preparation steps of the organosilicon maleimide are as follows: Under nitrogen protection, 1 part by mass of maleic anhydride is dissolved in 46 parts by mass of N,N-dimethylformamide, then 3.5 parts by mass of silicon-containing long-chain aliphatic amine is added and stirred at room temperature for 1 hour. Then, 0.72 parts by mass of pyridine is added, and the mixture is heated to 120°C and refluxed for 4 hours to obtain organosilicon maleimide.
[0030] The preparation steps of the silicon-containing long-chain aliphatic amine are as follows: Under nitrogen protection, the catalyst and unsaturated long-chain aliphatic amine are mixed at a mass ratio of 1:10, then heated to 70°C, refluxed for 160 min, and then isopropanol is removed by vacuum distillation at 75°C to obtain mixture A; then methyldiethoxysilane is added to the reaction vessel, stirred and heated to 70°C, and then mixture A is added dropwise. After the dropwise addition is completed, the temperature is raised to 90°C and held for 8 h; finally, unreacted unsaturated long-chain aliphatic amine is removed by vacuum distillation to obtain the silicon-containing long-chain aliphatic amine; the molar ratio of methyldiethoxysilane to unsaturated long-chain aliphatic amine is 1:1.1; the catalyst is obtained by compounding chloroplatinic acid and isopropanol at a mass ratio of 1:99. Example 2
[0031] A method for preparing an organocobalt salt to improve the tensile strength of rubber, comprising the following steps: (1) Weigh and mix the raw materials: 175 parts by weight of organosilicon vegetable fatty acid, 14 parts by weight of propionic acid, 25 parts by weight of solvent, and 25 parts by weight of cobalt hydroxide; (2) Add organosilicon plant fatty acids into the reactor and heat to melt for later use; (3) Preheat the solvent to 50°C, then add cobalt hydroxide and stir to disperse for at least 30 minutes to obtain a suspension; (4) Add propionic acid to the reactor in step (2) and stir evenly. Then add the suspension and heat to 95°C. After keeping the temperature for 2 hours, heat to 150°C and keep for 2 hours. Then remove the wastewater and excess propionic acid. Next, heat to 180°C and remove the solvent by vacuum distillation. Discharge and cool to obtain organic cobalt salt.
[0032] The preparation steps of the organosilicon plant fatty acid are as follows: Under nitrogen protection, 60 parts by mass of scraped and ground premium rosin are heated to 155°C to melt, and then 85 parts by mass of organosilicon maleimide are added and reacted at 185°C for 3.5 hours. Then the temperature is lowered to 75°C, and 125.5 parts by mass of glacial acetic acid are added. The temperature is maintained at 120°C and refluxed for 60 minutes to obtain organosilicon plant fatty acid.
[0033] The preparation steps of the organosilicon maleimide are as follows: Under nitrogen protection, 1 part by mass of maleic anhydride is dissolved in 46.5 parts by mass of N,N-dimethylformamide, then 3.55 parts by mass of silicon-containing long-chain aliphatic amine is added and stirred at room temperature for 2 hours. Then, 0.725 parts by mass of pyridine is added, and the temperature is raised to 130°C and refluxed for 3 hours within 4 hours to obtain organosilicon maleimide.
[0034] The preparation steps of the silicon-containing long-chain aliphatic amine are as follows: Under nitrogen protection, the catalyst and unsaturated long-chain aliphatic amine are mixed at a mass ratio of 1:15, then heated to 75°C and refluxed for 150 min. Isopropanol is then removed by vacuum distillation at 75°C to obtain mixture A. Next, methyldiethoxysilane is added to the reaction vessel, stirred and heated to 70°C, then mixture A is added dropwise. After the addition is complete, the temperature is raised to 100°C and held for 7 h. Finally, unreacted unsaturated long-chain aliphatic amine is removed by vacuum distillation to obtain the silicon-containing long-chain aliphatic amine. The molar ratio of methyldiethoxysilane to unsaturated long-chain aliphatic amine is 1:1.2. The catalyst is obtained by compounding chloroplatinic acid and isopropanol at a mass ratio of 1:99. Example 3
[0035] A method for preparing an organocobalt salt to improve the tensile strength of rubber, comprising the following steps: (1) Weigh and mix the raw materials: 210 parts by weight of organosilicon vegetable fatty acids, 16 parts by weight of propionic acid, 30 parts by weight of solvent, and 30 parts by weight of cobalt hydroxide; (2) Add organosilicon plant fatty acids into the reactor and heat to melt for later use; (3) Preheat the solvent to 50°C, then add cobalt hydroxide and stir to disperse for at least 30 minutes to obtain a suspension; (4) Add propionic acid to the reactor in step (2) and stir evenly. Then add the suspension and heat to 100°C. After keeping the temperature for 2 hours, heat to 160°C and keep for 2 hours. Then remove the wastewater and excess propionic acid. Then heat to 185°C and remove the solvent by vacuum distillation. Discharge and cool to obtain organic cobalt salt.
[0036] The preparation steps of the organosilicon plant fatty acid are as follows: Under nitrogen protection, 60 parts by mass of scraped and ground premium rosin are heated to 160°C to melt, and then 86 parts by mass of organosilicon maleimide are added and reacted at 190°C for 3 hours. Then the temperature is lowered to 80°C, and 126 parts by mass of glacial acetic acid are added. The temperature is maintained at 125°C and refluxed for 50 minutes to obtain organosilicon plant fatty acid.
[0037] The preparation steps of the organosilicon maleimide are as follows: Under nitrogen protection, 1 part by mass of maleic anhydride is dissolved in 47 parts by mass of N,N-dimethylformamide, then 3.6 parts by mass of silicon-containing long-chain aliphatic amine is added and stirred at room temperature for 3 hours. Then, 0.73 parts by mass of pyridine is added, and the mixture is heated to 40°C and refluxed for 2 hours within 4 hours to obtain organosilicon maleimide.
[0038] The preparation steps of the silicon-containing long-chain aliphatic amine are as follows: Under nitrogen protection, the catalyst and unsaturated long-chain aliphatic amine are mixed at a mass ratio of 1:20, then heated to 75°C and refluxed for 140 min. Isopropanol is then removed by vacuum distillation at 75°C to obtain mixture A. Next, methyldiethoxysilane is added to the reaction vessel, stirred and heated to 70°C, then mixture A is added dropwise. After the addition is complete, the temperature is raised to 110°C and held for 6 h. Finally, unreacted unsaturated long-chain aliphatic amine is removed by vacuum distillation to obtain the silicon-containing long-chain aliphatic amine. The molar ratio of methyldiethoxysilane to unsaturated long-chain aliphatic amine is 1:1.1. The catalyst is obtained by compounding chloroplatinic acid and isopropanol at a mass ratio of 1:99. Comparative Example 1
[0039] The difference between Comparative Example 1 and Example 2 is that the organic cobalt salt raw material components for improving the tensile strength of rubber include maleic acrid acid, propionic acid, solvent, and cobalt hydroxide. Comparative Example 2
[0040] The difference between Comparative Example 2 and Example 2 is that the organic cobalt salt raw material components for improving the tensile strength of rubber include maleic acridinium long-chain alkylimide, propionic acid, solvent, and cobalt hydroxide; the maleic acridinium long-chain alkylimide is prepared by reacting maleic acridinium with decylamine. Application examples
[0041] Table 1 below shows the composition of the organocobalt salts used in Examples 1-3 and Comparative Examples 1-2, as well as the adhesives prepared from existing organocobalt salts: Table 1
[0042] Table 2 below shows the test results of the mechanical properties of the rubbers in Application Examples 1-6 according to the national standard GB / T528-2009: Table 2
[0043] Table 3 below shows the results of the pull-out force test of rubber in Application Examples 1-6 according to national standards GB / T16586-2014, GB / T3512-2001, and GBT15905-1995, and the Mooney scorch time of the rubber compound tested at 125℃ according to national standard GB / T1232.1-2000. Table 3
[0044] As can be seen from Tables 2-3 above, the adhesives prepared from the organic cobalt salts in Examples 1-3, i.e. the adhesives in Examples 2-4, not only have higher tensile product, but also exhibit excellent effects in promoting the adhesion between metal and rubber.
[0045] In Application Example 1, the existing organocobalt salt SL-Co20.5 was used. Application Examples 5-6 corresponded to the organocobalt salts of Comparative Examples 1-2, respectively: the organocobalt salt precursor of Comparative Example 1 used maleic acridinium instead of organosilicon plant fatty acids; the organocobalt salt precursor of Comparative Example 2 was maleic acridinium long-chain alkylimide prepared by reacting maleic acridinium with decylamine, which also did not use organosilicon plant fatty acids. Comparing Application Examples 5-6 with Application Example 1, it can be seen that the introduction of maleic acridinium can significantly improve the tensile strength of rubber. The organocobalt salts prepared from organosilicon plant fatty acids used in Application Examples 2-4 not only endowed the rubber with better tensile properties and a longer scorch time, but also ensured that the rubber compound maintained good fluidity in the early stage of resin network formation, thereby achieving higher metal-rubber adhesion. In addition, its adhesion performance under thermo-oxidative aging and humid heat conditions was significantly less affected by the environment than that of existing organocobalt salts.
[0046] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. 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. An organic cobalt salt for improving the tensile strength of rubber, characterized in that, The raw material components, by mass parts, include 140-210 parts of organosilicon vegetable fatty acids, 10-16 parts of propionic acid, 20-30 parts of solvent, and 20-30 parts of cobalt hydroxide.
2. The organic cobalt salt for improving the tensile strength of rubber according to claim 1, characterized in that, The organosilicon plant fatty acids are obtained by reacting rosin with organosilicon maleimide.
3. The organic cobalt salt for improving the tensile strength of rubber according to claim 2, characterized in that, The organosilicon maleimide is prepared by reacting maleic anhydride with a silicon-containing long-chain aliphatic amine.
4. The organic cobalt salt for improving the tensile strength of rubber according to claim 3, characterized in that, The silicon-containing long-chain fatty amine is obtained by reacting methyldiethoxysilane with an unsaturated long-chain fatty amine.
5. The organic cobalt salt for improving the tensile strength of rubber according to claim 4, characterized in that, The unsaturated long-chain fatty amines include 9-decen-1-amine.
6. A method for preparing an organocobalt salt for improving the tensile strength of rubber as described in any one of claims 1 to 5, characterized in that, The preparation steps include: (1) Weigh and mix each raw material component; (2) Add organosilicon plant fatty acids into the reactor and heat to melt for later use; (3) Preheat the solvent to 50°C, then add cobalt hydroxide and stir to disperse for at least 30 minutes to obtain a suspension; (4) Add propionic acid to the reactor in step (2) and stir evenly. Then add the suspension and heat to 90~100℃. After keeping the temperature for 2 hours, heat to 150~160℃ and keep it for 2 hours. Then remove the wastewater and excess propionic acid. Then heat to 175℃~185℃ and remove the solvent by vacuum distillation. After cooling the discharged material, the organic cobalt salt is obtained.
7. The method for preparing the organocobalt salt for improving the tensile strength of rubber according to claim 6, characterized in that, The preparation steps of the organosilicon plant fatty acid are as follows: Under nitrogen protection, 60 parts by mass of scraped and ground premium rosin are heated to 150-160°C to melt, and then 84-86 parts by mass of organosilicon maleimide are added and reacted at 180-190°C for 3-4 hours. Then the temperature is lowered to 70-80°C, and 125-126 parts by mass of glacial acetic acid are added. The temperature is maintained at 115-125°C and refluxed for 50-70 minutes to obtain organosilicon plant fatty acid.
8. The method for preparing the organocobalt salt for improving the tensile strength of rubber according to claim 7, characterized in that, The preparation steps of the organosilicon maleimide are as follows: Under nitrogen protection, 1 part by mass of maleic anhydride is dissolved in 46-47 parts by mass of N,N-dimethylformamide, then 3.5-3.6 parts by mass of silicon-containing long-chain aliphatic amine is added and stirred at room temperature for 1-3 hours. Then, 0.72-0.73 parts by mass of pyridine is added, and the temperature is raised to 120-140℃ and refluxed for 2-4 hours within 4 hours to obtain organosilicon maleimide.
9. The method for preparing the organocobalt salt for improving the tensile strength of rubber according to claim 7, characterized in that, The preparation steps of the silicon-containing long-chain aliphatic amine are as follows: Under nitrogen protection, the catalyst and unsaturated long-chain aliphatic amine are mixed at a mass ratio of 1:(10~20), then heated to 70~75℃ and refluxed for 140~160 min. Isopropanol is then removed by vacuum distillation at 75℃ to obtain mixture A. Next, methyldiethoxysilane is added to the reaction vessel, stirred and heated to 70℃, then mixture A is added dropwise. After the dropwise addition is completed, the temperature is raised to 90~110℃ and kept at that temperature for 6~8 h. Finally, unreacted unsaturated long-chain aliphatic amine is removed by vacuum distillation to obtain the silicon-containing long-chain aliphatic amine. The molar ratio of methyldiethoxysilane to unsaturated long-chain aliphatic amine is 1:(1.1~1.3).
10. The method for preparing the organocobalt salt for improving the tensile strength of rubber according to claim 6, characterized in that, The catalyst is obtained by compounding chloroplatinic acid and isopropanol in a mass ratio of 1:99.