Vulcanization bag powder dispersion slurry system and preparation method thereof
By specifically preparing dispersion slurries containing zinc oxide, titanium dioxide, accelerator powder, and sulfur powder, the problems of low dispersion efficiency and poor storage stability in latex product production were solved, achieving a highly efficient dispersion and long-term stable slurry system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SAIFEI (TIANJIN) NEW MATERIAL TECH CO LTD
- Filing Date
- 2026-02-06
- Publication Date
- 2026-05-15
AI Technical Summary
In the production of latex products, existing technologies for vulcanized bag powder dispersion slurries suffer from problems such as low dispersion efficiency, coarse particle size, poor storage stability, and severe foaming during sulfur grinding, resulting in low slurry utilization and product quality fluctuations.
Specialized dispersion slurry preparation methods for different powder properties were adopted. Carboxymethyl cellulose suspension stabilizer and compound polymeric dispersant were added before wet grinding to prepare dispersion slurries for zinc oxide, titanium dioxide, accelerator powder and sulfur powder respectively, ensuring that each powder achieves ultrafine dispersion and long-term stability under high solid content.
It achieves efficient dispersion of zinc oxide, titanium dioxide, accelerator powder and sulfur powder, improves long-term storage stability, has good slurry compatibility, and ensures stable quality of latex products.
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Abstract
Description
Technical Field
[0001] This application relates to the field of polymer processing aids, and in particular to a vulcanized powder dispersion slurry system and its preparation method. Background Technology
[0002] In latex product manufacturing, vulcanizing agents are key additives that determine the final physical properties of the product. They typically contain solid powders such as titanium dioxide, zinc oxide, accelerators, and sulfur powder. To facilitate automated feeding and ensure uniform dispersion in the latex, these powders are often pre-prepared into high-solids-content water-based dispersions in the industry.
[0003] The current mainstream solutions in the industry have obvious flaws:
[0004] General dispersant approach: To simplify procurement and processes, a single, inexpensive dispersant (such as sodium methylene bis(naphthalene) sulfonate, NF) is commonly used to grind different powders separately. This approach ignores the significant differences in surface chemistry and physical properties between titanium dioxide (inorganic oxide), zinc oxide (high-density amphoteric oxide), accelerators (organometallic salts), and sulfur (non-polar crystals), resulting in low dispersion efficiency, coarse particle size (typically >5μm), poor storage stability (especially zinc oxide and sulfur are prone to hard precipitation), and severe foaming during sulfur grinding, leading to low slurry utilization and product quality fluctuations.
[0005] The current solution for mixed grinding: Physically mixing multiple powders and then grinding them simplifies the process, but the heterogeneous powders interfere with each other, resulting in poorer dispersion. Furthermore, the slurry has almost no storage stability and must be ground and used immediately, resulting in extremely low production flexibility.
[0006] Therefore, developing a specialized dispersion slurry system that can achieve efficient dispersion and long-term stable storage for different powder properties, and that is compatible with each other and with latex systems, is a technical problem that urgently needs to be solved in this field. Summary of the Invention
[0007] To achieve the requirements of efficient dispersion, stable storage, and high compatibility, this application provides a vulcanized powder dispersion slurry system and its preparation method.
[0008] In a first aspect, this application provides a method for preparing a vulcanized powder dispersion slurry system, employing the following technical solution:
[0009] A method for preparing a sulfurized powder dispersion slurry system includes the preparation of zinc oxide dispersion slurry, titanium dioxide dispersion slurry, accelerator powder dispersion slurry, and sulfur powder dispersion slurry.
[0010] Preparation of zinc oxide dispersion slurry:
[0011] 1) Mix water, wetting agent, polymeric dispersant and defoamer to prepare a liquid-phase base material;
[0012] 2) Add zinc oxide powder to the liquid phase base in batches and stir until completely wetted;
[0013] 3) Before grinding, add carboxymethyl cellulose suspension stabilizer to the mixture obtained in 2);
[0014] 4) The mixture obtained in 3) is wet-milled until the particle size D90 of zinc oxide particles is less than 3 μm;
[0015] 5) Add bactericide and antifungal agent to obtain zinc oxide dispersion slurry.
[0016] By adopting the above technical solution, a carboxymethyl cellulose suspension stabilizer is creatively added before wet grinding to address the high density and easy sedimentation of zinc oxide powder. This method ensures that a spatial stability network that inhibits sedimentation is simultaneously constructed on the basis of efficient dispersion, fundamentally solving the industry problem of hard sedimentation easily forming in high-solids content zinc oxide slurries during long-term storage, and achieving a synergistic breakthrough in dispersibility and stability.
[0017] Furthermore, the amount of carboxymethyl cellulose added is 0.3-0.7% of the weight of zinc oxide powder.
[0018] By adopting the above technical solution, the amount of carboxymethyl cellulose added is limited to the optimized range of 0.3-0.7%. This range ensures the formation of a sufficiently strong three-dimensional network structure to effectively support the ultrafine zinc oxide particles and resist gravity sedimentation; while avoiding excessive addition that would lead to excessively high slurry viscosity, deterioration of fluidity, or excessive thixotropy, thus affecting subsequent processing performance. This achieves the best balance between suspension effect and process applicability.
[0019] Furthermore, the polymeric dispersant is a polyacrylate dispersant; the wetting agent is a nonionic surfactant.
[0020] By adopting the above technical solution and selecting polyacrylate polymeric dispersants, the anchoring groups on their molecular chains have a strong adsorption effect on the zinc oxide surface, and the long-chain structure provides steric hindrance, ensuring the primary dispersion effect and laying the foundation for the subsequent stabilizing effect of carboxymethyl cellulose. Combined with a nonionic surfactant as a wetting agent, it can quickly reduce the surface tension of water, promote powder wetting and penetration, and the synergy of both provides the prerequisites for ultrafine dispersion and long-term stability.
[0021] Further, the preparation of the titanium dioxide dispersion slurry:
[0022] 1) Mix water, dispersant, and defoamer to prepare a liquid-phase base material;
[0023] 2) Add titanium dioxide to the liquid phase base in batches and stir until completely wetted;
[0024] 3) The mixture obtained in 2) is wet-milled until the particle size D90 of the titanium dioxide is less than 3μm;
[0025] 4) Add bactericide and antifungal agent to obtain titanium dioxide dispersion slurry.
[0026] By adopting the above technical solution, and considering the characteristics of titanium dioxide such as large specific surface area and easy agglomeration, a suitable non-ionic polymeric dispersant is used. The strong steric hindrance generated by its long-chain polymer is mainly relied on to prevent the particles from re-agglomerating under high-speed grinding and high solid content conditions, thereby stably achieving ultrafine dispersion with D90 less than 3μm, ensuring its excellent hiding power and whiteness in latex.
[0027] Further, the preparation of the accelerator powder dispersion slurry:
[0028] 1) Mix water, dispersant, wetting agent, and defoamer to prepare a liquid phase base; the dispersant is a mixture of anionic and nonionic dispersants;
[0029] 2) Add the accelerator powder to the liquid phase base in batches and stir until completely wetted;
[0030] 3) The mixture obtained in 2) is wet-milled until the particle size D90 of the accelerator powder is less than or equal to 5 μm;
[0031] 4) Add bactericide and mildew inhibitor to obtain accelerator powder dispersion slurry.
[0032] By adopting the above technical solution, and considering the characteristics of organic accelerator powder, an anionic and nonionic compound dispersant is used. The nonionic component rapidly wets the hydrophobic powder surface using its lipophilic groups; the anionic component imparts a charge to the particle surface after adsorption, generating electrostatic repulsion. The synergistic effect of the two improves the storage stability of the slurry while achieving effective wetting and fineness control, ensuring the uniform release of vulcanization promoting activity.
[0033] Further, the preparation of sulfur powder dispersion slurry:
[0034] 1) Mix water, dispersant, wetting agent, and defoamer to prepare a liquid phase base; the dispersant is a mixture of anionic and nonionic dispersants;
[0035] 2) Add sulfur powder to the liquid phase base in batches and stir until completely wetted;
[0036] 3) The mixture obtained in 2) is wet-milled until the particle size D90 of the sulfur powder is less than 3 μm;
[0037] 4) Add bactericide and antifungal agent to obtain sulfur powder dispersion slurry.
[0038] By adopting the above technical solution, addressing the challenges of sulfur powder's strong hydrophobicity, high specific gravity, and tendency to foam during grinding, an anionic and nonionic compound dispersant is used, along with a wetting agent and a highly efficient defoamer. This compound system effectively reduces the solid-liquid interfacial energy, improves wetting efficiency, and utilizes both electrostatic and steric stabilization mechanisms to achieve ultrafine dispersion, significantly suppressing foam generation during grinding, thus enabling the stable preparation of high-solids-content sulfur slurry.
[0039] Secondly, this application provides a vulcanized powder dispersion slurry system, which adopts the following technical solution:
[0040] A vulcanized powder dispersion slurry system comprises four independently slurries: zinc oxide dispersion slurry, titanium dioxide dispersion slurry, accelerator powder dispersion slurry, and sulfur powder dispersion slurry, all prepared by at least one of the above-mentioned vulcanized powder dispersion slurry system preparation methods.
[0041] Furthermore, the solid content of the zinc oxide dispersion slurry is 48-72%; after the slurry is stored at 25°C for 60 days, the volume of the bottom sediment accounts for less than 5% of the total volume, and it can be restored to a uniform state by stirring.
[0042] By adopting the above technical solution, the key performance indicators of zinc oxide dispersion slurry are defined. High solids content and ultrafine particle size demonstrate its excellent dispersibility; while the quantitative indicator of "sedimentation rate <5% after 60 days of standing and recoverable" directly proves the unexpected long-term storage stability brought about by the method of this invention, which is a significant improvement over the existing technology.
[0043] Furthermore, the titanium dioxide dispersion slurry has a solid content of 48-72% and a titanium dioxide particle size D90 of less than 3μm; the sulfur powder dispersion slurry has a solid content of 48-52% and a sulfur powder particle size D90 of less than 3μm.
[0044] By adopting the above technical solutions, the core properties of titanium dioxide and sulfur powder slurries were defined. The titanium dioxide slurry also achieved high solids content and ultrafine particle size, ensuring high hiding power and uniform dispersion in the latex. The sulfur slurry, while achieving high solids content, also achieved ultrafine dispersion, which facilitates its uniform distribution in the latex, promotes uniform vulcanization reaction, and improves product quality.
[0045] Furthermore, the solid content of the accelerator powder dispersion slurry is 48-52%, and the particle size D90 of the accelerator powder is less than or equal to 5μm.
[0046] By adopting the above technical solution, the performance of the accelerator powder dispersion slurry was defined. While ensuring a high solids content, the particle size was controlled at a relatively fine level, which not only met the requirements for uniform dispersion in latex and the exertion of accelerating activity, but also considered the technical difficulties and costs that some organic accelerator powders might face during ultrafine grinding, thus achieving a reasonable balance between performance and process feasibility.
[0047] In summary, this application has the following beneficial effects:
[0048] This application, with "the addition of carboxymethyl cellulose in zinc oxide slurry at a specific process" as its core, achieves a synergistic effect through precise "dedicated separate design" and the "process-oriented" introduction of the key component carboxymethyl cellulose. It has made significant progress over the prior art in terms of dispersion fineness, storage stability, process controllability and system compatibility. Detailed Implementation
[0049] The present application will be further described in detail below with reference to the embodiments.
[0050] Example of raw material and intermediate preparation
[0051] raw material
[0052] It should be noted that: in the following examples, unless otherwise specified, the conditions shall be in accordance with conventional conditions or the manufacturer's recommended conditions; and the raw materials used in the following examples, unless otherwise specified, shall be from commercially available sources.
[0053] Titanium dioxide: CNNC Titanium Dioxide 215#;
[0054] Zinc oxide: Industrial grade, purity ≥99.5%;
[0055] Accelerator BZ: Zinc dibutyldithiocarbamate, industrial grade;
[0056] Sulfur powder: Industrial grade, purity ≥99.8%;
[0057] Dispersant 1030W: Nonionic polyether polymeric dispersant;
[0058] Dispersant 9090: Ammonium polyacrylate polymeric dispersant;
[0059] Dispersant A: Anionic and nonionic compound polymeric dispersant suitable for organic powders, wherein the anionic component is polyacrylate and the nonionic component is polyoxyethylene ether surfactant, with a mass ratio of 1:1.
[0060] Dispersant 367: An anionic and nonionic compound dispersant suitable for hydrophobic crystalline powders, wherein the anionic component is an alkyl naphthalene sulfonate condensate and the nonionic component is a polyether-modified siloxane;
[0061] Wetting agent 940: a nonionic surfactant;
[0062] Defoamer DF-220S: Organosilicon defoamer;
[0063] Suspension stabilizer: Sodium carboxymethyl cellulose, viscosity range 800-1500 mPa·s (2% aqueous solution, 25℃);
[0064] GXL, a bactericide and fungicide: isothiazolinone bactericide.
[0065] Example
[0066] Example 1
[0067] A zinc oxide dispersion slurry, the preparation method of which is as follows:
[0068] 1) Add 50kg of water, 0.2kg of wetting agent 940, 4kg of dispersant 9090 and 0.1kg of defoamer DF-220S to the tank in sequence, stir well, and it will be a colorless and transparent liquid (slight turbidity is fine), which will be used to make a liquid phase base material;
[0069] 2) Add 50kg of zinc oxide powder to the liquid phase base in three equal portions, stirring until completely wetted. After each batch is added, stir at 300 rpm until no visible dry powder lumps are visible, ensuring that the powder is completely wetted.
[0070] 3) Add 0.25 kg of carboxymethyl cellulose suspension stabilizer to the mixture obtained in 2), and continue stirring for 10 minutes until it is completely dispersed and dissolved, and the system is homogeneous;
[0071] 4) Pump the mixture slurry obtained in 3) into a sand mill (medium is 0.7mm zirconia beads), grind at a linear speed of 10 m / s for 1.5 hours, and control the slurry temperature with circulating water to ≤45℃ until the particle size D90 of zinc oxide particles is less than 3μm;
[0072] 5) After grinding, add 0.1 kg of bactericide and antifungal agent GXL to obtain zinc oxide dispersion slurry.
[0073] Example 2
[0074] Unlike Example 1, the amount of carboxymethyl cellulose suspension stabilizer added in Example 2 is 0.1 kg.
[0075] Example 3
[0076] Unlike Example 1, the amount of carboxymethyl cellulose suspension stabilizer added in Example 3 is 0.5 kg.
[0077] Example 4
[0078] Unlike Example 1, in Example 4, an equal amount of xanthan gum was used to replace the carboxymethyl cellulose suspension stabilizer.
[0079] Example 5
[0080] A titanium dioxide dispersion slurry, the preparation method of which is as follows:
[0081] 1) Mix 50kg of water, 1kg of dispersant 1030W, and 0.1kg of defoamer DF-220S to prepare a liquid-phase base material;
[0082] 2) Add 50 kg of titanium dioxide to the liquid phase base in three equal portions and stir until completely wetted;
[0083] 3) Transfer to a sand mill (0.5mm zirconium beads) and grind for 1 hour until the particle size D90 of the titanium dioxide is less than 3μm;
[0084] 4) Add bactericide and antifungal agent GXL to obtain titanium dioxide dispersion slurry.
[0085] Example 6
[0086] A accelerator powder dispersion slurry, the preparation method of which is as follows:
[0087] 1) Mix 50kg of water, 1.5kg of dispersant A, 0.2kg of wetting agent 940, and 0.2kg of defoamer DF-220S to prepare a liquid phase base material;
[0088] 2) Add 50 kg of accelerator powder BZ in three equal portions to the liquid phase base material and stir until completely wetted;
[0089] 3) Mill the mixture obtained in 2) for 1 hour (using 0.7 mm zirconium beads) until the particle size D90 of the accelerator powder is less than or equal to 5 μm;
[0090] 4) Add bactericide and mildew inhibitor GXL to obtain accelerator powder dispersion slurry.
[0091] Example 7
[0092] A sulfur powder dispersion slurry, the preparation method of which is as follows:
[0093] 1) Mix 50kg water, 2.5kg dispersant 367, 0.2kg wetting agent 940, and 0.2kg defoamer DF-220S to prepare a liquid phase base material;
[0094] 2) Add 50 kg of sulfur powder to the liquid phase base material in three equal portions, stirring until completely wetted;
[0095] 3) The mixture obtained in 2) is milled for 1.5 hours (0.7 mm zircon beads) until the particle size D90 of the sulfur powder is less than 3 μm;
[0096] 4) Add bactericide and mildew inhibitor GXL to obtain sulfur powder dispersion slurry.
[0097] Comparative Example
[0098] Comparative Example 1
[0099] Unlike Example 1, step 3 was omitted in Comparative Example 1, and the grinding was carried out directly without adding carboxymethyl cellulose suspension stabilizer.
[0100] Comparative Example 2
[0101] Unlike Example 1, in Comparative Example 2, carboxymethyl cellulose suspension stabilizer was added in step 1), and then step 2) and subsequent steps were performed.
[0102] Comparative Example 3
[0103] Unlike Example 1, the formulation in Comparative Example 3 is: 50 kg zinc oxide powder, 50 kg water, and 3.5 kg dispersant NF (sodium methylene bis(naphthalene) sulfonate);
[0104] Preparation method: Put all raw materials into a vertical ball mill and discharge the material after ball milling for 12 hours.
[0105] Comparative Example 4
[0106] Unlike Example 5, in Comparative Example 4, an equal amount of NF dispersant was used to replace the dispersant 1030W.
[0107] Comparative Example 5
[0108] Unlike Example 6, in Comparative Example 5, dispersant A was replaced with an equal amount of sodium polyacrylate anionic dispersant.
[0109] Comparative Example 6
[0110] Unlike Example 7, in Comparative Example 6, dispersant 367 was replaced with an equal amount of NF dispersant.
[0111] Performance testing
[0112] Solid content (%): According to GB / T 1725-2007 standard, take about 1g of slurry into a weighed petri dish, dry it in an oven at 105℃ to constant weight, calculate the mass percentage of non-volatile matter, and the test results are shown in Table 1.
[0113] Particle size D90 (μm): The particle size was measured using a Malvern Mastersizer 3000 laser particle size analyzer with water as the dispersion medium after ultrasonic dispersion. The test results are shown in Table 1.
[0114] Initial viscosity (mPa·s): The Brookfield DV2T viscometer with RV-3 rotor was used to measure the viscosity at 30 rpm and 25℃. The results are shown in Table 1.
[0115] Storage stability:
[0116] Test method: Take 100mL of uniform slurry and place it in a 100mL stoppered transparent graduated cylinder, and let it stand at a constant temperature of 25℃ in the dark;
[0117] Evaluation indicators:
[0118] Sedimentation rate: Record the percentage of bottom sediment volume to total volume at specified time points (7, 30, 60 days);
[0119] Precipitation state: Observe the properties of the precipitate. "Soft precipitate" refers to precipitate that can be redispersed uniformly by gentle shaking or stirring (e.g., 30 seconds, 500 rpm); "hard lumps" refers to precipitate that form dense lumps that cannot be dispersed by conventional stirring. The test results are shown in Table 1.
[0120] Process characteristics observation: Record the foam height (none, low, medium, high) and the appearance of the discharged slurry (such as uniformity, stratification, water separation, etc.) during the grinding process. The test results are shown in Table 1.
[0121] System compatibility: Four slurries prepared according to the method of this invention were taken from Examples 1, 5, 6, and 7 and mixed evenly according to the typical formula weight ratio of zinc oxide:titanium dioxide:accelerator:sulfur = 5:2:0.5:2 to form mixed slurry 1. Comparative Examples 3-6 were taken and mixed in the same ratio to form mixed slurry 2. This mixed slurry was added at 1% to a natural latex with a solid content of 60% ammonia, stirred at high speed for 3 minutes, and then allowed to stand for 1 hour. The presence of incompatibility phenomena such as flocculation, demulsification, or a sharp increase in viscosity was observed. The test results are shown in Table 2.
[0122] Table 1 Results of individual slurry performance tests
[0123]
[0124]
[0125] Table 2 Results of performance tests on mixed slurry
[0126] System compatibility Mixed slurry 1 Excellent, no flocculation, no emulsification Mixed slurry 2 Poor, exhibiting flocculation and thickening.
[0127] It can be seen that:
[0128] Regarding zinc oxide dispersion slurries, this invention fundamentally solves the long-term sedimentation problem of high-density zinc oxide at high solids content by adding a specific amount of carboxymethyl cellulose after powder wetting and before grinding. Compared to Comparative Example 1 and Comparative Example 3 using a traditional NF dispersant, the zinc oxide slurry of Example 1 achieves a synergistic leap in dispersion fineness and storage stability. Data demonstrates that the addition of carboxymethyl cellulose and its specific processing steps are key to this effect; its dosage range, when optimized, achieves the best balance between suspension and flowability.
[0129] For titanium dioxide powder paste, the use of a specialized nonionic polymeric dispersant (Example 5) significantly improved dispersion efficiency and storage stability compared to the general-purpose NF dispersant (Comparative Example 4). The paste of Example 5 had a finer particle size and almost no sedimentation within 60 days, which ensured its excellent hiding power and whiteness in latex products, overcoming the defects of coarse particle size and easy sedimentation caused by general-purpose dispersants.
[0130] In accelerator dispersion slurries, considering the characteristics of organic accelerators, the use of anionic and nonionic compound dispersants (Example 6) demonstrates irreplaceable advantages. Compared with Comparative Example 5, which uses a single anionic dispersant, the compound dispersant achieves good wetting and dispersion through synergistic effects, and controls the 60-day sedimentation rate at a low level of 5%, ensuring the uniformity and stability of the promoting active ingredients.
[0131] For sulfur powder, which is the most difficult to disperse, the anionic / non-acidic compound dispersant of this invention successfully overcomes the industry pain point of severe foaming and difficulty in stabilizing during high solids content grinding. Example 7 significantly suppressed grinding foam while achieving ultrafine dispersion and good storage properties; while Comparative Example 6, which used NF dispersant, had severe foaming, failed to achieve the target solids content, and quickly settled and hardened, highlighting the core value of the dedicated dispersant.
[0132] Ultimately, the complete system composed of the four specialized slurries (mixed slurry 1) exhibited excellent internal compatibility and application reliability. System compatibility testing showed excellent compatibility with latex after mixing; while the control system mixed with traditional NF process slurries showed flocculation. This strongly demonstrates that the "separate specialized, system-designed" overall solution of this invention not only improves the performance of each component but also solves the compatibility problem when multiple heterogeneous powder dispersion systems coexist, achieving a leap from single material improvement to a system solution.
[0133] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.
Claims
1. A method for preparing a vulcanized powder dispersion slurry system, characterized in that, This includes the preparation of zinc oxide dispersion slurry, titanium dioxide dispersion slurry, accelerator powder dispersion slurry, and sulfur powder dispersion slurry. Preparation of zinc oxide dispersion slurry: 1) Mix water, wetting agent, polymeric dispersant and defoamer to prepare a liquid-phase base material; 2) Add zinc oxide powder to the liquid phase base in batches and stir until completely wetted; 3) Add carboxymethyl cellulose suspension stabilizer to the mixture obtained in 2); 4) The mixture obtained in 3) is wet-milled until the particle size D90 of zinc oxide particles is less than 3 μm; 5) Add bactericide and antifungal agent to obtain zinc oxide dispersion slurry.
2. The method for preparing a vulcanized powder dispersion slurry system according to claim 1, characterized in that, The amount of carboxymethyl cellulose added is 0.3-0.7% of the weight of zinc oxide powder.
3. The method for preparing a vulcanized powder dispersion slurry system according to claim 1, characterized in that, The polymeric dispersant is a polyacrylate dispersant; the wetting agent is a nonionic surfactant.
4. The method for preparing a vulcanized powder dispersion slurry system according to claim 1, characterized in that, Preparation of the titanium dioxide dispersion slurry: 1) Mix water, dispersant, and defoamer to prepare a liquid-phase base material; 2) Add titanium dioxide to the liquid phase base in batches and stir until completely wetted; 3) The mixture obtained in 2) is wet-milled until the particle size D90 of the titanium dioxide is less than 3μm; 4) Add bactericide and antifungal agent to obtain titanium dioxide dispersion slurry.
5. The method for preparing a vulcanized powder dispersion slurry system according to claim 1, characterized in that, Preparation of accelerator powder dispersion slurry: 1) Mix water, dispersant, wetting agent and defoamer to prepare liquid phase base material; the dispersant is a mixture of anionic and nonionic dispersants; 2) Add the accelerator powder to the liquid phase base in batches and stir until completely wetted; 3) The mixture obtained in 2) is wet-milled until the particle size D90 of the accelerator powder is less than or equal to 5 μm; 4) Add bactericide and mildew inhibitor to obtain accelerator powder dispersion slurry.
6. The method for preparing a vulcanized powder dispersion slurry system according to claim 1, characterized in that, Preparation of sulfur powder dispersion slurry: 1) Mix water, dispersant, wetting agent, and defoamer to prepare a liquid phase base; the dispersant is a mixture of anionic and nonionic dispersants; 2) Add sulfur powder to the liquid phase base in batches and stir until completely wetted; 3) The mixture obtained in 2) is wet-milled until the particle size D90 of the sulfur powder is less than 3 μm; 4) Add bactericide and antifungal agent to obtain sulfur powder dispersion slurry.
7. A vulcanized powder dispersion slurry system, characterized in that, It consists of at least four independently slurries prepared by any of the sulfurized powder dispersion slurry preparation methods as described in claims 1-6: zinc oxide dispersion slurry, titanium dioxide dispersion slurry, accelerator powder dispersion slurry, and sulfur powder dispersion slurry.
8. The vulcanized powder dispersion slurry system according to claim 7, characterized in that, The zinc oxide dispersion slurry has a solid content of 48-72%; after being stored at 25°C for 60 days, the volume of the bottom sediment accounts for less than 5% of the total volume, and it can be restored to a homogeneous state by stirring.
9. The vulcanized powder dispersion slurry system according to claim 7, characterized in that, The titanium dioxide dispersion slurry has a solid content of 48-72% and a titanium dioxide particle size D90 of less than 3μm; the sulfur powder dispersion slurry has a solid content of 48-52% and a sulfur powder particle size D90 of less than 3μm.
10. The vulcanized powder dispersion slurry system according to claim 7, characterized in that, The solid content of the accelerator powder dispersion slurry is 48-52%, and the particle size D90 of the accelerator powder is less than or equal to 5μm.