Rubber composition based on mixed carbon black and tire
By adding thermally cracked carbon black to form aggregates during the carbon black generation stage, the problem of insufficient reinforcement and poor dispersion in the tire is solved, the tire reinforcement and fatigue performance is improved, and more uniform Particle size distribution.
Patent Information
- Application Number
- CN202411618339.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-01-07
AI Technical Summary
Thermal cracked carbon black has problems such as insufficient reinforcement, poor dispersion and poor wear performance in tire processing, and it is difficult to completely replace the native carbon black in the tread formulation, and the dispersion caused by large particle size is uneven.
Thermal cracked carbon black is added during the aggregation stage of carbon black generation, and aggregates are formed through collision to form a premixed mixed carbon black to improve its reinforcement.
It improves the dispersion and reinforcement performance of carbon black in the rubber, improves the fatigue and processing performance of the tire, and overcomes the problem of uneven dispersion.
Smart Images
Figure CN119264531A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of tire processing, in particular to a rubber composition and a tire based on mixed carbon black. Background Art
[0002] Waste tire pyrolysis technology is a technology that completely pyrolyzes waste tires into various usable resources. After pyrolysis of waste tires, high value-added pyrolysis gas, pyrolysis oil, pyrolysis carbon black and steel wire can be obtained. It is currently one of the most economical methods for recycling waste tires. Because pyrolysis carbon black is recycled and reduced, its reinforcement cannot be compared with that of original carbon black. By partially replacing and using it in combination with carbon black, it can provide high-quality and low-cost products.
[0003] Taking the ASTM D3192 natural rubber formula to test the basic physical properties of carbon black as an example, after using only pyrolytic carbon black, the results showed that the 100% modulus and 300% modulus were significantly lower than the reference carbon black, and the tensile strength also decreased significantly. The above results show that the reinforcement of pyrolytic carbon black is not as good as that of native carbon black.
[0004] For ease of use, the industry currently uses thermal cracking carbon black to partially replace 3 series and 6 series carbon black, which has a certain performance decline. The performance is restored to the original level through formula adjustment. The disadvantage of the above scheme is that it cannot replace 1 series and 2 series carbon black for tread formulation because the wear performance will deteriorate. On the other hand, the formula needs to be adjusted to maintain the performance of the original formula.
[0005] The current method of using thermal black is to use it together with carbon black in the formulation system, mix it in an internal mixer and add it to the colloid for dispersion. Thermal black and carbon black are physically mixed, and the particle size of thermal black is large, resulting in a wide particle size distribution of the material in the reinforcement system, uneven dispersion and inferior reinforcement to carbon black.
[0006] Based on this, a rubber composition and a tire based on mixed carbon black are now provided, which can eliminate the disadvantages of the existing devices. Summary of the invention
[0007] The purpose of the present invention is to provide a rubber composition and tire based on mixed carbon black. The mixed carbon black used in the present application proposal is produced by adding thermal cracking carbon black as a raw material in the aggregation stage of carbon black generation, colliding with carbon black particles under nucleation to form aggregates, and agglomerating on the surface of the aggregates to generate premixed carbon black. The mixed carbon black generated by this method improves the reinforcement of thermal cracking carbon black.
[0008] To achieve the above object, the present invention provides the following technical solutions:
[0009] A rubber composition based on mixed carbon black, consisting of the following parts by weight:
[0010] Component 1: 30-60 parts of rubber parts;
[0011] Component 2: 45-60 parts of mixed carbon black, 2-6 parts of environmentally friendly oil, 2-7 parts of zinc oxide, 1-3 parts of stearic acid, and 2-5 parts of antioxidant.
[0012] On the basis of the above technical solution, the present invention also provides the following optional technical solution:
[0013] In one optional solution: Component 1: 30-60 parts of rubber;
[0014] Component 2: 50 parts of mixed carbon black, 4 parts of environmentally friendly oil, 3 parts of zinc oxide, 2 parts of stearic acid, and 4 parts of antioxidant.
[0015] In an optional solution, the rubber member is one or more of butadiene rubber, latex styrene butadiene rubber, natural rubber, chlorinated butyl rubber, and brominated butyl rubber.
[0016] In an optional solution: the mixed carbon black is obtained by adding thermal cracking carbon black to the primary carbon black during the primary carbon black generation stage and reacting with the primary carbon black;
[0017] The addition ratio of thermal cracking carbon black is 5% to 50%. The reaction temperature of carbon black is 1000°C to 2000°C.
[0018] In an optional embodiment, the native carbon black is one or more of N115, N134, N121, N234, N220, N330, N375, N326, N550, and N660.
[0019] In an optional scheme: the thermal cracking carbon black at least meets the following requirements: the oil absorption value measured by the instrumental method according to GB / T 3780.2 is in the range of 60 to 90 mL / 100 g, or the statistical thickness surface area measured according to GB / T 10722 is in the range of 50 to 70 m2 / g, and the toluene permeability measured according to GB / T 3780.15 is equal to or greater than 80%; the maximum value of the single particle crushing strength measured according to GB / T 14853.6 is equal to or less than 160 cN.
[0020] A tire is made by using the above-mentioned rubber composition based on mixed carbon black.
[0021] Compared with the prior art, the present invention has the following beneficial effects:
[0022] In this application proposal, thermal cracking carbon black is added during the production stage of carbon black to form carbon black aggregates. The particle size distribution of carbon black particles is narrow, which overcomes the problem of uneven dispersion caused by physical mixing, improves the dispersion of carbon black in the rubber, greatly improves the reinforcement performance, and at the same time improves the fatigue performance of the rubber. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 Schematic diagram of mechanically mixed carbon black of the present invention.
[0024] Figure 2 Schematic diagram of carbon black produced by the chemical reaction of the present invention.
[0025] Figure 3 This is a particle diagram of the present invention having a wide particle size distribution.
[0026] Figure 4 This is a particle diagram of a particle with a narrow particle size distribution according to the present invention.
[0027] Figure 5 It is a processing performance diagram of the present invention. DETAILED DESCRIPTION
[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0029] Example 1
[0030] See also Figure 1-Figure 5 As shown, following the analytical data of Table 1, the comparative example is a sample obtained by mechanically mixing carbon black and thermal cracking carbon black, and the example is a product obtained by adding thermal cracking carbon black during the carbon black generation stage. The comparative example is not used in the present invention.
[0031] For the testing of the above samples, the following test methods were used:
[0032] The oil absorption value is tested according to the manual method of GB / T 3780.2 or ASTM D2414.
[0033] According to GB / T 3780.4 or ASTM D3493, the compression oil absorption value is tested:
[0034] According to ASTM D1510, a sample weighing 0.5000g was tested for iodine absorption value.
[0035] The external specific surface area (STSA) test is carried out according to GB / T 10722 or ASTM D6556.
[0036] The 300% elongation stress test is carried out according to GB / T 3780.18 test method A or ASTM D3192.
[0037] The particle crushing strength test is carried out according to GB / T 14853.6.
[0038] The particle size distribution was tested by Malvern laser particle size analyzer and ultrasonicated for 20 minutes;
[0039] Table 1 Chemical indicators of the embodiments:
[0040] Test items unit Comparative Example Example Oil absorption value <![CDATA[10 -5 m 3 / kg]]> 90 92 Compression oil absorption value <![CDATA[10 -5 m 3 / kg]]> 62 69 Iodine absorption value g / kg 42 44 External specific surface area (STSA) <![CDATA[10 3 m 2 / kg]]> 40 42 300% modulus of tensile stress Mpa -2.4 -1.9 Particle crushing strength, maximum 127 50 Particle size distribution, D50 μm 5.946 6.029
[0041] Detect the oil absorption value. The higher the test value, the higher the primary structure and the higher the reinforcement performance.
[0042] Test the compression oil absorption value. The higher the test value, the higher the secondary structure and the higher the reinforcement performance.
[0043] Detect the iodine absorption value. The higher the test value, the smaller the particles, the higher the reinforcement performance, the higher the wear resistance, and the greater the heat generation;
[0044] Detect the external specific surface area (STSA) value. The higher the test value, the smaller the particles, the higher the reinforcement performance, the higher the wear resistance, and the greater the heat generation;
[0045] Test the 300% modulus stress value. The higher the test value, the higher the reinforcement performance.
[0046] Test the particle crushing strength value. The higher the test value, the less likely the particles are to break, resulting in low tensile properties and elongation.
[0047] Detect the particle size distribution value. The larger the D50 value, the larger the particle size, and the narrower the distribution, which means the more uniform the particle size.
[0048] Compared with the comparative example, the most obvious feature of the embodiment is that the 300% modulus stress is improved and the particle distribution is more uniform;
[0049] Example 2
[0050] Following the formulation of Table 2, the rubber compositions are referred to herein as Example 1 and Comparative Example 1 and Comparative Example 2. The comparative examples are not used in the present invention.
[0051] Using a 1.7-liter internal mixer, mix the chemicals other than sulfur and accelerator for 5 minutes, then mix sulfur and accelerator in an open mixer. The vulcanization conditions of the compound are 151°C × 30 minutes, and vulcanization is carried out in a flat vulcanizer to obtain a 2mm thick vulcanized rubber sheet. The obtained vulcanized rubber sheet is used for the following experiments.
[0052] All compositions were used to produce test specimens by vulcanization, the vulcanization conditions being 151°C for 30 minutes, and these test specimens were used to determine material properties typical for the rubber industry. For the testing of the above test specimens, the following test methods were used:
[0053] According to GB / T 528, tensile strength and elongation at break at room temperature.
[0054] According to GB / T 16586, steel wire bond pull-out force at room temperature.
[0055] According to GB / T 3512, hot air aging is performed;
[0056]
[0057] All samples were vulcanized at 151°C for 30 minutes. High temperature thermal oxidation aging conditions: temperature 100°C, time 48 hours. Detect the tensile strength value, the higher the test value, the better the strength;
[0058] Test the elongation value. The higher the test value, the better the fatigue resistance and chipping resistance.
[0059] Test the tensile stress value. The higher the test value, the higher the modulus and the higher the reinforcing performance of carbon black.
[0060] Test the flexural performance value. The higher the test value, the better the fatigue performance.
[0061] Table 2 Basic physical properties data:
[0062]
[0063] Table 3 Flexural properties:
[0064]
[0065] The test was performed using a capillary rheometer at 60-120°C, with the extrusion speed being a variable, such as Figure 5 As shown. Under the same extrusion temperature, the lower the rate, the smoother the extrusion appearance. Under the same speed, the extrusion appearance of Comparative Example 1 is the smoothest, indicating that the processing performance is better. The extrusion appearance of Comparative Example 2 is not smooth, indicating that the processing performance is deteriorated. The extrusion appearance of Example 1 is close to that of Comparative Example 1, indicating that the extrusion performance is good;
[0066] The current method of using thermal black is to use it together with carbon black in the formulation system, mix it in an internal mixer and add it to the colloid for dispersion. Thermal black and carbon black are physically mixed, and the particle size of thermal black is large, resulting in a wide particle size distribution of the material in the reinforcement system, uneven dispersion and inferior reinforcement to carbon black.
[0067] In this application proposal, thermal cracking carbon black is added during the production stage of carbon black to form carbon black aggregates. The particle size distribution of carbon black particles is narrow, which overcomes the problem of uneven dispersion caused by physical mixing, improves the dispersion of carbon black in the rubber, greatly improves the reinforcement performance, and at the same time improves the fatigue performance of the rubber.
[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A rubber composition based on mixed carbon black, characterized in that: It is composed of the following parts by mass: Component 1: 30-60 parts of rubber parts; Component 2: 45-60 parts of mixed carbon black, 2-6 parts of environmentally friendly oil, 2-7 parts of zinc oxide, 1-3 parts of stearic acid, and 2-5 parts of antioxidant.
2. The rubber composition based on mixed carbon black according to claim 1, characterized in that It is composed of the following parts by mass: Component 1: 30-60 parts of rubber parts; Component 2: 50 parts of mixed carbon black, 4 parts of environmentally friendly oil, 3 parts of zinc oxide, 2 parts of stearic acid, and 4 parts of antioxidant.
3. The rubber composition based on mixed carbon black according to claim 1, characterized in that The rubber piece is one or more of butadiene rubber, latex styrene butadiene rubber, natural rubber, chlorinated butyl rubber and brominated butyl rubber.
4. The rubber composition based on mixed carbon black according to claim 1, characterized in that The mixed carbon black is obtained by adding thermal cracking carbon black to the original carbon black during the generation stage of the original carbon black and reacting with the original carbon black; The addition ratio of thermal cracking carbon black is 5% to 50%. The reaction temperature of carbon black is 1000°C to 2000°C.
5. The rubber composition based on mixed carbon black according to claim 4, characterized in that The native carbon black is one or more of N115, N134, N121, N234, N220, N330, N375, N326, N550, and N660.
6. The rubber composition based on mixed carbon black according to claim 1, characterized in that The thermal cracking carbon black at least meets the following requirements: the oil absorption value measured by the instrumental method according to GB / T 3780.2 is in the range of 60 to 90 mL / 100 g, or the statistical thickness surface area measured according to GB / T10722 is in the range of 50 to 70 m2 / g, and the toluene permeability measured according to GB / T 3780.15 is equal to or greater than 80%; the maximum value of the single particle crushing strength measured according to GB / T 14853.6 is equal to or less than 160 cN.
7. A tire characterized by The rubber composition is made from the mixed carbon black rubber composition according to any one of claims 1 to 6.