White carbon black high dispersing agent as well as preparation method and application thereof

Abstract

The invention discloses a method for modifying white carbon black and application of the white carbon black in rubber vulcanization. The method comprises the following steps: oleic acid and isooctyl alcohol enter a reaction kettle through a metering tank; continuously heating the materials to 190-200 DEG C, and slowly vacuumizing after the materials are qualified by testing; heating to 205-215 DEG C after the vacuum reaches the limit, cooling to 75-85 DEG C after no alcohol is discharged, adding a hydrolytic agent sodium hydroxide (NaOH), vacuumizing, steaming water, heating to 120-140 DEG C, keeping the temperature for 1-2 hours, cooling to 60-80 DEG C, and circulating to a middle finished product tank; and filtering the material in a post-treatment kettle by a filter until the material is clear, and then compounding the material with zinc oxide according to a set proportion to obtain the white carbon black high dispersing agent HT85. When the synthesized modifier is applied to low-filling and high-filling white carbon black formulas, not only can the appearance of a mixed rubber material be improved, but also the scorching time of the rubber material can be prolonged.

Description

Technical Field

[0001] The present invention relates to the field of rubber, and in particular to a method for modifying white carbon black and application of the method in rubber vulcanization. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance some understanding of the overall background of the invention and should not be necessarily regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

[0003] With the increasing market demand for new energy vehicles in recent years, the new energy vehicle industry has ushered in a round of rapid development. Tires are an important component among them, and they have high requirements for the driving experience and safety of the car. In the traditional tire industry, carbon black can improve the mechanical strength of rubber products and increase their service life, and is often used as a tire reinforcement. However, carbon black is often accompanied by serious pollution problems during the production process, and in recent years, the requirements for tires have gradually increased, requiring good anti-slip and wear resistance while reducing the rolling resistance of the tire, thereby reducing the energy consumption of the car. Therefore, white carbon black (SiO2) has gradually come into the field of vision of researchers due to its high specific surface area, nano-scale particles and high porosity, making it a rubber reinforcement agent to replace carbon black.

[0004] The application of unmodified silica in industry can effectively improve the ability of rubber composites to resist aging and cracking. However, the presence of internal polysiloxane structure and surface hydroxyl groups makes the surface polarity of silica high, making it difficult to disperse evenly in the rubber compound, and the interaction between it and the rubber compound is not obvious. Therefore, if silica is to be used as a reinforcing agent, silica should be modified to improve its dispersion effect in rubber. Current research mainly focuses on grafting modification and structural modification of silica, as well as the use of dispersants to improve the dispersibility of silica. The high specific surface area of ​​silica promotes the coating of rich hydroxyl groups on its surface, which also provides unlimited possibilities for silica modification. Since 1976, researchers have carried out alkylation treatment of silica and modification of silica using silane coupling agents. To meet increasingly stringent tire performance requirements, research is needed into the application of highly filled silica in tire rubber. Increasing the amount of silica used in the formulation can provide the tire with lower rolling resistance (compared to carbon black formulations) and higher grip, but also with poorer wear resistance. Therefore, highly filled silica offers a better balance between the tire's "devil's triangle" problem. Therefore, in the application of highly filled silica, improving the production process and formulation to further enhance silica's performance is also an effective approach. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention enhances the dispersibility of silica by adding a new dispersant to the formulation. The dispersant's performance in highly filled silica formulations is studied through vulcanization, processing, and mechanical property tests. The present invention provides a method for preparing a high-performance silica dispersant, HT85, which is used as a functional modifier for highly filled silica. The synthesized modifier, when used in low- and high-filled silica formulations, not only improves the appearance of the mixed rubber but also extends the scorch time of the rubber. It exhibits excellent processing properties and is significantly superior to the commonly used silica dispersant EF44.

[0006] The technical solution adopted in the present invention is as follows: In a first aspect of the present invention, a method for preparing a high-dispersant silica HT85 is provided. The method is simple in process and the synthesized high-dispersant silica HT85 has high purity. The method comprises the following steps: Oleic acid and isooctyl alcohol enter the reactor through the metering tank. After the feeding is completed, the vacuum valve is opened to put the reactor into a vacuum state. At the same time, the thermal oil valve is opened to increase the temperature. The material is continuously heated to 190-200℃, the thermal oil is turned off, and the heating is stopped. The material is sampled at a constant temperature under vacuum. After the test is qualified, the vacuum is slowly lifted. After the vacuum reaches the limit, the temperature is raised to 205~215℃ and when no alcohol is produced, the temperature is lowered to 75~85℃. The hydrolyzing agent sodium hydroxide (NaOH) is added to raise the vacuum distilled water temperature to 120~140℃ and keep the temperature constant for 1~2h. The temperature is then lowered to 60~80℃ and circulated to the intermediate finished product tank. The light component (unreacted isooctyl alcohol) is recycled through short-path distillation, and the heavy component (isooctyl oleate and a small amount of unreacted oleic acid) enters the post-processing kettle. After the material is filtered and clarified in the post-processing kettle, it is compounded with zinc oxide according to the set ratio to obtain the white carbon black high dispersant HT85.

[0007] In one or some embodiments of the present invention, in order to fully react oleic acid, the molar ratio of oleic acid to isooctyl alcohol is 1:1-1.25.

[0008] In one or some embodiments of the present invention, the standard for passing the test is acidity <1.

[0009] In one or some embodiments of the present invention, the specific amount of the hydrolyzing agent (NaOH) is adjusted according to the amount of reactants and reaction conditions.

[0010] In one or some embodiments of the present invention, the molar ratio of the material after filtration to zinc oxide is (0.9-0.93): (0.07-0.13).

[0011] In a second aspect of the present invention, a high-dispersant silica HT85 prepared by the above method is provided.

[0012] In a third aspect of the present invention, the application of the silica high dispersant HT85 in a rubber compound formulation containing low-filled or high-filled silica dispersants is provided to improve the dispersibility, processing performance and physical properties of silica.

[0013] The silica high dispersant HT85 of the present invention is used as a high-filled silica dispersant in a mixed rubber compound formula to improve the dispersion of the high-filled silica in the rubber compound, reduce the rubber compound Mooney, improve the rubber compound fluidity, and have a good performance retention rate in terms of wear.

[0014] In a fourth aspect of the present invention, a mixed rubber material is provided, which is prepared by the following method: adding white carbon black dispersant HT85, SSBR, CB24, white carbon black, N330, antioxidant, SA, protective wax, silane coupling agent, DPG-80, and ZnO-80 in proportion into a mixer for first-stage mixing, and adding CBS-80 and S-80 to the above materials for second-stage mixing.

[0015] In one or some embodiments of the present invention, the weight ratio of SSBR:CB24:silica gel:N330:antioxidant:SA:protective wax:silane coupling agent:DPG-80:ZnO-80:silica gel dispersant HT85:CBS-80:S-80 is (90~100):(25~35):(60~100):(5~15):(2~4):(0.5~1.5):(2~8):(2~3):(2~5):(1~3):(1~2):(1~2).

[0016] Preferably, the weight ratio of the SSBR:CB24:white carbon black:N330:antioxidant:SA:protective wax:silane coupling agent:DPG-80:ZnO-80:white carbon black dispersant HT85:CBS-80:S-80 is 96.25:30:(60~100):10:3:1:5:2.5:3.75:2:1.88:1.88.

[0017] Preferably, the antioxidant includes but is not limited to antioxidant 4020.

[0018] Preferably, the protective wax includes but is not limited to high-end protective wax HG72.

[0019] Preferably, the silane coupling agent includes but is not limited to Si69.

[0020] In one or some embodiments of the present invention, the first mixing time is 460 seconds, and the binder removal temperature is maintained at 150-160° C. The second mixing time is 2-6 hours, and can be 4-6 hours to ensure product purity.

[0021] The silica modifier described in this invention works by arguably being a high-dispersant silica modifier, HT85, a long-chain fatty acid ester organic mixture with excellent chemical and thermal stability. The fatty acid ester, with its polarity intermediate between that of polar silica and non-polar rubber, acts as an adhesive at the interface, allowing highly polar substances to be stably dispersed within the non-polar rubber while simultaneously reducing its tendency to agglomerate.

[0022] Experimental results show that the unsaturated side chains of oleic acid and the side chain structure of isooctyl alcohol form a synergistic effect, resulting in superior adsorption efficiency, spatial arrangement, and polarity matching of the ester molecules on the silica surface compared to other fatty acid-alcohol combinations, resulting in the most effective dispersion. Other combinations, such as stearic acid-n-octanol, result in unstable adsorption, insufficient steric repulsion, or excessive aggregation, resulting in poor technical results.

[0023] Compared with the related art known to the inventors, one of the technical solutions of the present invention has the following beneficial effects: The present invention uses a high-dispersant silica HT85 as a silica dispersant, which is suitable for low-filled silica formulations and high-filled silica formulations, effectively improves the dispersion effect of silica, reduces the Mooney value of the rubber compound, increases the fluidity of the rubber compound, has a good performance retention rate in terms of modulus and abrasion, and enhances the bonding strength between silica and the rubber compound.

[0024] In low-filled silica formulations (60 phr), using 1-3 phr of silica dispersant HT85 as an equal or partial replacement for EF44 can significantly improve the compound processing performance and silica dispersibility. Low-filled silica has excellent wear resistance.

[0025] In highly filled silica formulations (>100 phr), silica high dispersant HT85 maintains better physical properties of the rubber compound. Compared to low-filled silica, highly filled silica formulations offer lower rolling resistance and higher grip for tires.

[0026] Low-filled silica formula and high-filled silica formula each have their own advantages, but silica high dispersant HT85, as a silica dispersant, can show excellent performance in both. DETAILED DESCRIPTION

[0027] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations and / or combinations thereof.

[0029] In order to enable those skilled in the art to more clearly understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0030] All raw materials described in the present invention can be obtained through commercial channels.

[0031] The chemical name of silane coupling agent Si-69: bis-(γ-triethoxysilylpropyl)-tetrasulfide.

[0032] SSBR is called solution-polymerized styrene-butadiene rubber in Chinese. It is a styrene-butadiene rubber (SBR) produced by solution polymerization process.

[0033] CB24 is a specific grade of neodymium-containing butadiene rubber (NdBR) in the rubber industry and is a high-performance synthetic rubber.

[0034] N330 is a type of high wear-resistant carbon black commonly used in the rubber industry and is a type of furnace black.

[0035] SA refers to stearic acid, which is an important rubber additive, mainly used as an activator, lubricant and softener.

[0036] DPG-80 is a pre-dispersed accelerator used in the rubber industry. Its main ingredient is diphenylguanidine (DPG, 1,3-diphenylguanidine). The "80" indicates that the active ingredient content is 80%, and the remaining 20% ​​is rubber carrier (such as EPDM rubber, styrene-butadiene rubber) and dispersant.

[0037] ZnO-80 is a pre-dispersed zinc oxide masterbatch used in the rubber industry. It is composed of 80% zinc oxide (ZnO) and 20% polymer carrier (such as EPDM, NBR) and dispersant. It is mainly used to activate rubber vulcanization systems, improve vulcanization efficiency and enhance rubber properties.

[0038] EF44 is a processing aid for natural and synthetic rubber processing. Its main component is a mixture of fatty acid derivatives (mainly zinc soap).

[0039] CBS-80 is a vulcanization accelerator with the chemical composition and mass percentage of 80% N-cyclohexyl-2-benzothiazolesulfenamide (CBS / CZ) + 20% carrier (such as EPDM rubber, dispersing aid).

[0040] S-80 is a vulcanizing agent with the chemical composition and mass percentage of 80% sulfur + 20% anti-caking agent / dispersing aid.

[0041] The following raw material ratios are in parts by weight.

[0042] Example 1: The raw materials oleic acid and isooctyl alcohol required for the production of white carbon black high dispersant HT85 are fed into the reactor through the metering tank in a molar ratio of 1:1.25. After the feeding is completed, the vacuum valve is opened to put the reactor in a vacuum state. At the same time, the heat transfer oil valve is opened to increase the temperature. The material is continuously heated to 195°C. The heat transfer oil is turned off and the heating is stopped. The material is sampled at a constant temperature under vacuum. After the test is qualified (acid value ≤ 1), the vacuum is slowly lifted. After the vacuum reaches the limit, the temperature is raised to 210°C and no alcohol is produced. After that, the temperature is lowered to The temperature is 80℃, sodium hydroxide as a hydrolyzing agent is added to vacuum distill water and the temperature is raised to 130℃. The temperature is kept constant for one hour and then cooled to 70℃. The product is circulated to the intermediate finished product tank. After a certain amount is added, short-path distillation is started. The light components (unreacted isooctyl alcohol) are recycled, and the heavy components (isooctyl oleate and a small amount of unreacted oleic acid) enter the post-processing kettle. The material is filtered and clarified in the post-processing kettle and then enters the liquid tank. Finally, it is compounded with zinc oxide in a certain molar ratio of 0.93:0.07 to obtain the product HT85.

[0043] Example 2: During the mixing of the rubber compound, SSBR (96.25), CB24 (30), white carbon black (60), N330 (10), antioxidant 4020 (3), SA (1), high-efficiency protective wax HG72 (1), silane coupling agent Si-69 (5), DPG-80 (2.5), ZnO-80 (3.75) were added to the internal mixer, and then the above-mentioned white carbon black functional modifier (the white carbon black high dispersant HT85 prepared in Example 1, 2) was added and mixed for 460 seconds, and the rubber was discharged (temperature was 155°C). The second mixing stage was carried out in the open mixer, and the vulcanizer S-80 (1.88) and the accelerator CBS-80 (1.88) were added, with the front roller at 50°C and the rear roller at 60°C. The prepared white carbon black high dispersant HT85 significantly improved the agglomeration phenomenon caused by the difficulty in dispersing white carbon black particles in the rubber compound, and made the white carbon black uniformly dispersed. This is because the unsaturated fatty acid esters in the silica high dispersant HT85 have good wettability, which reduces the polarity of silica and improves its emulsification and dispersion function at the interface between silica and rubber.

[0044] Example 3: During the mixing of the rubber compound, SSBR (96.25), CB24 (30), white carbon black (100), N220 (5), antioxidant (4), SA (1), protective wax (1.5), silane coupling agent (10), DPG-80 (2.5), ZnO-80 (3), and tread resin (30) were added to an internal mixer, and then the above-mentioned white carbon black functional modifier (the white carbon black high dispersant HT85,2 prepared in Example 1) was added and mixed for 460 seconds, and the rubber was discharged (temperature was 155°C). The second mixing stage was carried out in an open mixer, and vulcanizing agent S-80 (1.88) and accelerator CBS-80 (1.88) were added. The front roller was kept at 50°C and the rear roller was kept at 60°C.

[0045] Comparative Example 1: In the mixing of the rubber compound, SSBR (96.25), CB24 (30), white carbon black (60), N330 (10), antioxidant (3), SA (1), protective wax (1), silane coupling agent (5), DPG-80 (2.5), ZnO-80 (3.75) were added to the internal mixer, and then the white carbon black dispersant EF44 (2) was added and mixed for 460 seconds, and the rubber was discharged (temperature was 155°C). The second mixing stage was carried out in the open mixer, and the vulcanizer S-80 (1.88) and the accelerator CBS-80 (1.88) were added. The front roller was 50°C and the rear roller was 60°C.

[0046] Comparative Example 2: During the mixing of the rubber compound, SSBR (96.25), CB24 (30), white carbon black (60), N330 (10), antioxidant (3), SA (1), protective wax (1), silane coupling agent (5), DPG-80 (2.5), and ZnO-80 (3.75) were added to an internal mixer. The white carbon black dispersant HT85 and functional modifier prepared in Example 1 were not added. The rubber compound was mixed for 460 seconds and discharged (temperature was 155°C). The second mixing stage was carried out in an open mixer, and vulcanizing agent S-80 (1.88) and accelerator CBS-80 (1.88) were added. The front roller was kept at 50°C and the rear roller was kept at 60°C.

[0047] Comparative Example 3: In the mixing of the rubber compound, SSBR (96.25), CB24 (30), white carbon black (100), N330 (5), antioxidant (4), SA (1), protective wax (1.5), silane coupling agent (10), DPG-80 (2.5), ZnO-80 (3), tread resin (30) were added to the internal mixer, and then the white carbon black dispersant EF44 (2) was added and mixed for 460 seconds, and the rubber was discharged (temperature was 155°C). The second mixing stage was carried out in the open mixer, and the vulcanizer S-80 (1.88) and the accelerator CBS-80 (1.88) were added. The front roller was 50°C and the rear roller was 60°C.

[0048] Comparative Example 4: During the mixing of the rubber compound, SSBR (96.25), CB24 (30), white carbon black (100), N330 (5), antioxidant (4), SA (1), protective wax (1.5), silane coupling agent (10), DPG-80 (2.5), ZnO-80 (3), and tread resin (30) were added to an internal mixer. The white carbon black dispersant HT85 and functional modifier prepared in Example 1 were not added. The rubber compound was mixed for 460 seconds and discharged (temperature was 155°C). The second mixing stage was carried out in an open mixer, and vulcanizing agent S-80 (1.88) and accelerator CBS-80 (1.88) were added. The front roller was kept at 50°C and the rear roller was kept at 60°C.

[0049] Comparison of low-filled silica formulation applications: The processing performance experimental data of Example 2 and Comparative Examples 1 and 2 are shown in Table 1.

[0050] Table 1 Processing performance experimental data

[0051] The dynamic performance experimental data of Example 2 and Comparative Examples 1 and 2 are shown in Table 2.

[0052] Table 2 Dynamic performance experimental data

[0053] The physical property experimental data of Example 2 and Comparative Examples 1 and 2 are shown in Table 3.

[0054] Table 3 Physical properties experimental data In summary, in the 60phr silica formula, the silica high dispersant HT85 is better than the silica dispersant EF44 in dispersing silica and improving rubber processing.

[0055] Comparison of high-filled silica formula applications: The processing performance experimental data of Example 3 and Comparative Examples 3 and 4 are shown in Table 4.

[0056] Table 4 Processing performance experimental data

[0057] The dynamic performance experimental data of Example 3 and Comparative Examples 3 and 4 are shown in Table 5.

[0058] Table 5 Dynamic performance experimental data

[0059] The physical property experimental data of Example 3 and Comparative Examples 3 and 4 are shown in Table 6.

[0060] Table 6 Physical property test data

[0061] In summary, in a 100 phr silica formulation, the silica high dispersant HT85 is superior to the silica dispersant EF44 in terms of silica dispersion and improvement in rubber processing and modulus retention.

[0062] Comparative Example 5 Process comparison test verification Experimental group (i.e. Example 1): Strictly follow the process of "temperature rise (195°C) -> temperature rise (210°C) -> temperature drop (80°C) -> temperature rise (130°C) -> temperature drop (70°C)", the product ester content is 98.3%, the dispersed silica particle size D50 = 1.2 μm, and the stability (static for 72 h) has no stratification.

[0063] (2) Comparative group 1 (omit the second temperature rise): only rise to 195°C, the rest is the same as the experimental group, the product ester content is 75%, the moisture content is 1.5%, the particle size D50 = 3.5 μm after dispersion, and stratification occurs after 24 h.

[0064] (3) Comparative group 2 (without temperature drop to 80°C for direct neutralization): after reaction, add alkali directly, the rest is the same as the experimental group, the product ester hydrolysis rate is 20%, the product contains sodium fatty acid impurities, and the silica particles completely agglomerate during dispersion.

[0065] (4) Comparative group 3 (omit the third temperature rise), the rest is the same as the experimental group, the product salt content is 0.8% (0.1% in the experimental group), the particle size D50 = 2.8 μm after dispersion, and stratification occurs after 48 h.

[0066] Conclusion: Multiple temperature rises and drops are to efficiently promote the reaction during the reaction stage, reduce by-products, optimize the operating conditions during the separation stage, ensure product purity, and ultimately achieve the economic efficiency and stability of the process.

[0067] Comparative Example 6 Comparative experiment of stearic acid-n-octanol combination and oleic acid-isooctanol combination.

[0068] Experimental materials 1. Silica; 2. Oleic acid-isooctanol ester (silica high dispersant HT85 obtained in Example 1, referred to as oleic acid-isooctanol ester). 3. Stearic acid-n-octanol ester (replace the oleic acid in Example 1 with stearic acid, and follow the other methods according to Example 1 to obtain the product, referred to as stearic acid-n-octanol ester) 4. Natural rubber; Experimental method 1. Sample preparation: Oleic acid-2-octanol ester and stearic acid-1-octanol ester were added to natural rubber containing silica in the same proportions and kneaded under the same process conditions (such as the same temperature, pressure, mixing time, etc.) to prepare two rubber composite samples.

[0069] 2. Performance testing: 1) Dispersion test: Transmission electron microscopy (TEM) was used to observe the dispersion of silica in the rubber matrix of the two samples, and the average particle size and distribution uniformity of silica particles were calculated.

[0070] 2) Mechanical properties test: Test the tensile strength, elongation at break and other mechanical properties of the two samples according to relevant standards.

[0071] 3) Adsorption performance test: The adsorption amount and adsorption stability of ester molecules on the surface of silica are determined by adsorption isotherm and other methods.

[0072] Comparison of experimental results: 1) Dispersion Results: TEM observations show that in the sample containing oleic acid-octanol ester, silica particles are evenly dispersed within the rubber matrix, with a smaller average particle size. In contrast, in the sample containing stearic acid-n-octanol ester, silica particles exhibit significant agglomeration, with a larger average particle size and uneven distribution. This suggests that the molecular structure of the stearic acid-n-octanol combination results in poor silica dispersion within the rubber matrix, insufficient steric repulsion, and increased aggregation.

[0073] 2) Mechanical Properties: Tensile test results show that the sample containing oleic acid-octanol ester exhibits higher tensile strength and elongation at break, while the sample containing stearic acid-n-octanol ester exhibits relatively poor mechanical properties. This further suggests that the stearic acid-n-octanol combination is not sufficiently dispersed, affecting the mechanical properties of the rubber composite.

[0074] 3) Adsorption Performance Results: Adsorption performance test results show that oleic acid-isooctanol ester molecules adsorbed on the silica surface in large and stable amounts, while stearic acid-n-octanol ester molecules adsorbed on the silica surface in relatively small amounts, were unstable, and easily desorbed. This explains why the stearic acid-n-octanol combination had a poor dispersion effect: its molecules were unstable on the silica surface and could not effectively disperse.

[0075] in conclusion: Comparative experiments clearly show that the molecular structure of stearic acid-n-octanol leads to unstable adsorption, insufficient steric repulsion, or excessive aggregation, resulting in poor technical results. However, oleic acid-isooctanol, due to its unique molecular structure, can form stable and effective adsorption on the surface of silica, making silica evenly dispersed in the rubber matrix, thereby significantly improving the performance of rubber composites.

[0076] The above embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited to the above embodiments, and any changes, modifications, substitutions, combinations, simplifications, etc. made without departing from the spirit and principles of the present application should be equivalent replacement manners and should be included in the protection scope of the present application.

Claims

1. A method for preparing a high-dispersant white carbon black HT85, characterized in that: The method comprises the following steps: Oleic acid and isooctyl alcohol enter the reactor through the metering tank. After the feeding is completed, the vacuum valve is opened to put the reactor into a vacuum state. At the same time, the thermal oil valve is opened to increase the temperature. The material is continuously heated to 190-200℃, the thermal oil is turned off, and the heating is stopped. The material is sampled at a constant temperature under vacuum. After the test is qualified, the vacuum is slowly lifted. After the vacuum reaches the limit, the temperature is raised to 205~215℃ and no alcohol is produced, then the temperature is lowered to 75~85℃, and the hydrolyzing agent sodium hydroxide (NaOH) is added to raise the vacuum distilled water temperature to 120~140℃, and the temperature is kept constant for 1~2 hours. Then the temperature is lowered to 60~80℃ and circulated to the intermediate finished product tank; short-range distillation is performed, the light components are recycled, and the heavy components enter the post-processing kettle. After the material is filtered and clarified in the post-processing kettle, it is compounded with zinc oxide according to the set ratio to obtain the white carbon black high dispersant HT85.

2. The method for preparing the white carbon black high dispersant HT85 according to claim 1, characterized in that: The usage ratio of oleic acid to isooctyl alcohol is 1:1-1.

25.

3. The method for preparing the white carbon black high dispersant HT85 according to claim 1, wherein: The standard for passing the test is acidity <1.

4. The method for preparing the white carbon black high dispersant HT85 according to claim 1, wherein: The molar ratio of the clear material after filtration to zinc oxide is (0.9~0.93): (0.07~0.13).

5. The silica high dispersant HT85 prepared by the method according to any one of claims 1 to 4.

6. Use of the high silica dispersant HT85 according to claim 5 in a rubber compound formulation containing low-filled or high-filled silica dispersants.

7. A rubber compound characterized by being It is prepared by the following method: adding silica dispersant HT85, SSBR, CB24, silica, N330, antioxidant, SA, protective wax, silane coupling agent, DPG-80, and ZnO-80 into a mixer according to a set proportion for first-stage mixing, and adding CBS-80 and S-80 to the above materials for second-stage mixing.

8. The rubber compound according to claim 7, wherein: The weight ratio of the SSBR:CB24:white carbon black:N330:antioxidant:SA:protective wax:silane coupling agent:DPG-80:ZnO-80:white carbon black dispersant HT85:CBS-80:S-80 is (90-100):(25-35):(60-100):(5-15):(2-4):(0.5-1.5):(2-8):(2-3):(2-5):(1-3):(1-2):(1-2).

9. The rubber compound according to claim 8, wherein: The weight ratio of the SSBR:CB24:white carbon black:N330:antioxidant:SA:protective wax:silane coupling agent:DPG-80:ZnO-80:white carbon black dispersant HT85 is 96.25:30:(60~100):10:3:1:5:2.5:3.75:2:1.88:1.

88.

10. The rubber compound according to claim 7, wherein: The mixing time for one stage is 460s, and the debinding temperature is maintained at 150~160℃.

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