Method for testing particle size distribution of carbon powder
By using ultrapure water and surfactants as dispersion media, the problems of alcohol dissolution and residue in toner particle size detection were solved, achieving uniform dispersion and accurate testing of toner, thus improving safety and economy.
Patent Information
- Application Number
- CN202511055374.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-30
- Publication Date
- 2025-10-31
AI Technical Summary
In existing methods for detecting toner particle size, alcohol as a dispersion medium has problems such as dissolving light components, being flammable and leaving residues, and being difficult to clean, resulting in inaccurate test results and potential safety hazards.
Ultrapure water and surfactants are used as dispersion media. Carbon powder is dispersed by an ultrasonic cleaner and detected by a laser particle size analyzer to form an oil-in-water emulsion, which avoids particle agglomeration and improves data accuracy and security.
This method achieves uniform dispersion of toner, reduces surface tension, ensures the accuracy and safety of test results, avoids the environmental and cleaning challenges associated with alcohol, and reduces costs.
Smart Images
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Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of toner analysis, and relates to a method for testing the particle size distribution of toner. Background Technology
[0002] Particle size distribution refers to the distribution of particles within a sample across different particle size ranges, typically used to describe the proportion or quantity of particles of each size in a particulate system. It is a crucial parameter in particle science, materials science, and chemical engineering, directly influencing the physical and chemical properties of materials (such as flowability, solubility, and reactivity). Carbon powder includes coke powder (graphite powder) and pitch. The particle size of carbon powder significantly affects the coating effect of anode materials (such as graphite and silicon-based materials) and battery performance.
[0003] Small-particle carbon powder is more likely to form a uniform and dense coating layer, effectively filling the pores on the surface of the negative electrode material, reducing the direct contact between the active material and the electrolyte, thereby suppressing side reactions (such as excessive SEI film growth). However, excessively fine carbon powder may agglomerate due to its high surface energy, making it difficult to disperse. Shortening the ion diffusion path and increasing the diffusion rate are also advantages. However, excessively fine carbon powder may block material pores, hindering electrolyte wetting and reducing ion conductivity. Large-particle carbon powder coating layers may be uneven, leading to localized exposed areas, affecting the cycle stability and safety of the battery. An imperfect conductive network may increase internal resistance, affecting performance at high currents. Insufficient coating flexibility makes it prone to cracking due to volume changes during cycling, losing its protective function. Retaining more pores facilitates electrolyte penetration. However, a longer ion diffusion path may limit rate performance. Based on the above, it can be seen that the optimal particle size selection usually requires a trade-off between conductivity, coating density, and ion transport. The particle size of carbon powder needs to be optimized based on the characteristics of the negative electrode material (such as expansion rate and conductivity) and the battery performance requirements (energy density, cycle life, rate capability).
[0004] In the field of toner particle size analysis, alcohol is commonly used as the medium. Toner is a mixture of various hydrocarbons, and alcohol may dissolve the lighter components (such as aromatic hydrocarbons and resins), artificially reducing particle size and distorting the distribution results. Our research has found that alcohol penetration into toner particles may cause them to swell, affecting the original particle size (especially for modified asphalt or samples containing additives). Toner is highly hydrophobic, and although alcohol is less polar than water, it may still fail to effectively disperse highly viscous toner particles, easily causing agglomeration (requiring ultrasonic assistance or dispersants, which may introduce interference). Furthermore, alcohol is flammable and leaves residues, often requiring heating or ultrasonic pretreatment for testing, posing a risk of combustion and explosion in an alcohol environment. After alcohol evaporates, asphalt may adhere to instrument tubing or lenses, making cleaning difficult.
[0005] Therefore, it is essential to develop a method that can be used to test toner particle size distribution and has long-term growth potential. Summary of the Invention
[0006] To overcome the shortcomings of existing technologies, this invention provides a method for testing toner particle size distribution. This method is convenient, low-cost, and allows for uniform toner dispersion, making testing easier. This invention uses ultrapure water and surfactants as the dispersion medium, unlike the traditional method using alcohol. Alcohol reduces the surface tension of water, alleviating the hydrophobicity of the toner and making it easier to disperse in the medium, thus better reflecting the toner particle size distribution information. Furthermore, alcohol is not only expensive, but also extremely difficult to clean after the experiment, increasing time costs. In contrast, the dispersion medium used in this invention is inexpensive and readily available, provides stable data, and does not cause equipment contamination or difficult-to-clean issues.
[0007] The above-mentioned objective of this invention is achieved through the following technical solution:
[0008] A method for testing toner particle size distribution is a dispersant-based method. The dispersant is mixed evenly with the toner to be tested, and then dispersed in an ultrasonic cleaner for 15-20 minutes until there is no agglomeration at the bottom. A laser particle size analyzer is used to detect the particle size of the toner under the premise of non-spherical particles and a stirring rate of 2400 rpm, and finally the particle size information of the toner to be tested is obtained.
[0009] Furthermore, the dispersion ratio of the dispersant to the toner is 90–98:2–10.
[0010] The dispersant includes ultrapure water and surfactant, with a mass-volume percentage of 90-98:2-10 between ultrapure water and surfactant.
[0011] The dispersant is prepared by uniformly mixing ultrapure water and a surfactant in a specific ratio. The dispersant is an aqueous dispersant.
[0012] Ultrapure water is water with a resistivity of 18.25 MΩ*cm.
[0013] Furthermore, the surfactant can be any one of ionic surfactants, nonionic surfactants, or mixed amphoteric surfactants.
[0014] The preferred ionic surfactant is sodium dodecyl sulfate, the preferred nonionic surfactant is sodium dodecyl polyoxyethylene ether sulfate, and the preferred mixed amphoteric surfactant is Libai brand dishwashing liquid.
[0015] Combining pure water with surfactants as a dispersion medium offers significantly superior performance compared to traditional alcohol systems, primarily through the refinement and reconstruction of the following innovative advantages: A novel dual-effect synergistic dispersion mechanism is achieved through the directional adsorption of surfactant molecules (hydrophobic groups anchoring carbon powder / hydrophilic groups forming a hydration layer), constructing a dual-stabilized system of "steric hindrance + electrostatic repulsion." Compared to the single solvation effect of alcohol, this system enhances the dispersion efficiency of nanoparticles and effectively inhibits Ostwald ripening. Furthermore, it revolutionizes green chemistry processes by replacing flammable and volatile organic solvents with pure water, raising the flash point from 12°C (alcohol) to non-flammable during production. This technological solution breaks through the conventional mindset that dispersion media must rely on organic solvents through molecular design.
[0016] The advantages of this invention compared to the prior art are:
[0017] The advantages of this invention compared to existing technologies are:
[0018] 1. This invention disperses toner powder with a prepared dispersant. The hydrophobic end of the surfactant is anchored to the surface of the toner particles, while the hydrophilic end extends outward to form a protective layer, preventing particle aggregation (e.g., nonionic surfactants). Ionic surfactants (e.g., anionic surfactants) charge the surface of asphalt particles, maintaining dispersion stability through charge repulsion (suitable for emulsified asphalt). In the toner-water system, the surfactant disperses the toner into tiny droplets (1–10 micrometers in diameter) through emulsification, forming an oil-in-water (O / W) emulsion. This emulsion exhibits good fluidity at room temperature, facilitating particle size distribution testing.
[0019] 2. This invention uses ultrapure water and surfactants as dispersion media, resulting in excellent dispersion. It effectively reduces the surface tension of toner particles, prevents agglomeration, and ensures uniform dispersion in water, guaranteeing test results that more closely approximate the true particle size distribution. Furthermore, pure water, as an environmentally friendly solvent, largely avoids the effects of organic solvents on the dissolution or swelling of toner, ensuring stable particle morphology.
[0020] 3. The dispersant selected in this invention can reduce measurement errors. Laser particle size analyzers rely on the scattered light signal from particles; if particles agglomerate, it will lead to an overestimation of the detected particle size. The dispersing effect of surfactants can reduce agglomeration and improve data accuracy. Pure water has a stable refractive index and less background interference, which is more conducive to the accurate acquisition of laser scattering signals.
[0021] 4. The operation process of this invention is safe and convenient. Compared with commonly used organic solvents in the laboratory (such as ethanol, toluene, etc.), the dispersant prepared by pure water and surfactant is safer, more environmentally friendly, and less expensive, making it suitable for routine laboratory testing.
[0022] 5. This invention uses an aqueous dispersant as the dispersion medium because alcohol is flammable and easily leaves residues, and after evaporation, asphalt easily adheres to instrument tubing or lenses, making cleaning difficult. However, aqueous dispersants are easy to clean and avoid residual contamination of instruments or samples. Therefore, the dispersant of this invention eliminates safety hazards and provides certain preventative measures for subsequent cleaning. Attached Figure Description
[0023] Figure 1 This is a particle size distribution trend diagram for Examples 1 to 3 of the present invention. In the diagram, a represents Example 1, b represents Example 2, and c represents Example 3.
[0024] Figure 2 This is a particle size distribution trend diagram of Comparative Examples 1 and 3 of the present invention. In the diagram, a represents Comparative Example 1 and b represents Comparative Example 3.
[0025] Figure 3 This is a particle size distribution trend diagram for Examples 1 to 3 of the present invention. In the diagram, a represents Example 1, b represents Example 2, and c represents Example 3.
[0026] Figure 4 This is a particle size distribution trend diagram of Comparative Examples 2 and 4 of the present invention. In the diagram, a represents Comparative Example 2 and b represents Comparative Example 4. Detailed Implementation
[0027] The present invention is described in detail below through specific embodiments, but this does not limit the scope of protection of the present invention. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can all be obtained commercially.
[0028] This invention disperses toner powder with a prepared dispersant. The hydrophobic end of the surfactant is anchored to the surface of the toner particles, while the hydrophilic end extends outward to form a protective layer, preventing particle aggregation (e.g., nonionic surfactants). Ionic surfactants (e.g., anionic surfactants) charge the surface of asphalt particles, maintaining dispersion stability through charge repulsion (suitable for emulsified asphalt). In the asphalt-water system, the surfactant disperses the asphalt into tiny droplets (1–10 micrometers in diameter) through emulsification, forming an oil-in-water (O / W) emulsion. This emulsion exhibits good fluidity at room temperature, making it easy to use.
[0029] This invention utilizes a mixture of ultrapure water and surfactant as the dispersion medium. Unlike traditional dispersants, which may use organic solvents such as alcohol and acetone for particle size analysis, leaving residues on the toner surface and affecting dispersibility and measurement results, pure water leaves no residue, resulting in more accurate data. Toner is prone to agglomeration due to electrostatic or hydrophobic properties; pure water, combined with an appropriate dispersant (such as trace amounts of surfactant), can effectively disperse it, avoiding interference from falsely large particles. Toner typically has a high refractive index (e.g., 1.5–2.0), while pure water's refractive index (1.33) provides a suitable scattering signal, leading to more accurate laser diffraction results. The high purity of pure water reduces interference from bubbles or impurities on light scattering. Pure water testing for toner particle size is environmentally friendly, accurate, and economical, making it particularly suitable for the research and quality control of toner products in solvent-sensitive or water-dependent applications.
[0030] The present invention provides a method for testing the particle size distribution of toner, comprising the following steps: taking 30 ml of dispersant solution into a 500 ml glass beaker, adding 2-4 mg of toner material, dispersing it evenly, then dispersing it for 15-20 minutes using an ultrasonic cleaner to obtain a toner solution; finally, using a laser particle size analyzer to detect the toner material and obtain its particle size information.
[0031] The dispersant is prepared by uniformly stirring ultrapure water (90-98% by mass and volume) and surfactant (2-10% by mass and volume).
[0032] The following section uses coke powder and pitch in toner as specific examples to conduct particle size testing.
[0033] Using coke powder from the toner as a sample:
[0034] Example 1
[0035] The preparation method in this embodiment includes the following steps:
[0036] (1) Ultrapure water was prepared using an ultrapure water system to obtain ultrapure water with a resistivity of 18.25 MΩ*cm. The ultrapure water and the ionic surfactant sodium dodecyl sulfate were mixed and stirred at a mass-volume percentage of 90:10 to obtain the ionic dispersant.
[0037] (2) Prepare a 500 ml glass beaker, take 30 ml of the ionic dispersant obtained in step (1), add 2 mg of coke powder material, and disperse it evenly.
[0038] (3) Disperse the mixed solution obtained in step (2) using an ultrasonic cleaner for 15-20 minutes to obtain a coke powder solution.
[0039] (4) Finally, a laser particle size analyzer was used to detect the coke powder under the conditions of non-spherical particles, a stirring rate of 2400 rpm, and a refractive index of pure water of 1.33, with an ionic dispersant as the dispersion medium. The particle size information was obtained. The test results are shown in Table 1.
[0040] Example 2
[0041] The preparation method in this embodiment includes the following steps:
[0042] (1) Ultrapure water was prepared using an ultrapure water system to obtain ultrapure water with a resistivity of 18.25 MΩ*cm. Ultrapure water and nonionic surfactant sodium dodecyl polyoxyethylene ether sulfate were mixed and stirred at a mass-volume percentage of 95:5 to obtain a nonionic dispersant.
[0043] (2) Prepare a 500 ml glass beaker, take 30 ml of the nonionic dispersant obtained in step (1), add 2 mg of coke powder material, and disperse it evenly.
[0044] (3) Disperse the mixed solution obtained in step (2) using an ultrasonic cleaner for 15-20 minutes to obtain a coke powder solution.
[0045] (4) Finally, a laser particle size analyzer was used to detect the coke powder under the conditions of non-spherical particles, a stirring rate of 2400 rpm, and a refractive index of pure water of 1.33, with a non-ionic dispersant as the dispersion medium. The particle size information was obtained. The test results are shown in Table 1.
[0046] Example 3
[0047] The preparation method in this embodiment includes the following steps:
[0048] (1) Ultrapure water was prepared using an ultrapure water system to obtain ultrapure water with a resistivity of 18.25 MΩ*cm. The ultrapure water and the mixed amphoteric surfactant detergent were mixed and stirred at a mass-volume percentage of 98:2 to obtain the mixed amphoteric dispersant.
[0049] (2) Prepare a 500 ml glass beaker, take 30 ml of the dispersant obtained in step (1), add 2 mg of coke powder material, and disperse it evenly.
[0050] (3) Disperse the mixed solution obtained in step (2) using an ultrasonic cleaner for 15-20 minutes to obtain a coke powder solution.
[0051] (4) Finally, a laser particle size analyzer was used to detect the coke powder under the conditions of non-spherical particles, a stirring rate of 2400 rpm, and a refractive index of pure water of 1.33, with a mixed amphoteric dispersant as the dispersion medium. The particle size information was obtained. The test results are shown in Table 1.
[0052] Using the pitch in the toner as a sample:
[0053] Example 4
[0054] The preparation method in this embodiment includes the following steps:
[0055] (1) Ultrapure water was prepared using an ultrapure water system to obtain ultrapure water with a resistivity of 18.25 MΩ*cm. The ultrapure water and the ionic surfactant sodium dodecyl sulfate were mixed and stirred at a mass-volume percentage of 90:10 to obtain the ionic dispersant.
[0056] (2) Prepare a 500 ml glass beaker, take 30 ml of the ionic dispersant obtained in step (1), add 2 mg of asphalt material, and disperse it evenly.
[0057] (3) Disperse the mixed solution obtained in step (2) using an ultrasonic cleaner for 15-20 minutes to obtain an asphalt solution;
[0058] (4) Finally, a laser particle size analyzer was used to test the asphalt under the conditions of non-spherical particles, a stirring rate of 2400 rpm, and a refractive index of pure water of 1.33, with an ionic dispersant as the dispersion medium. The particle size information was obtained. The test results are shown in Table 2.
[0059] Example 5
[0060] The preparation method in this embodiment includes the following steps:
[0061] (1) Ultrapure water was prepared using an ultrapure water system to obtain ultrapure water with a resistivity of 18.25 MΩ*cm. Ultrapure water and nonionic surfactant sodium dodecyl polyoxyethylene ether sulfate were mixed and stirred at a mass-volume percentage of 95:5 to obtain a nonionic dispersant.
[0062] (2) Prepare a 500 ml glass beaker, take 30 ml of the nonionic dispersant obtained in step (1), add 2 mg of asphalt material, and disperse it evenly.
[0063] (3) Disperse the mixed solution obtained in step (2) using an ultrasonic cleaner for 15-20 minutes to obtain an asphalt solution;
[0064] (4) Finally, a laser particle size analyzer was used to test the asphalt under the conditions of non-spherical particles, a stirring rate of 2400 rpm, and a refractive index of pure water of 1.33, using a non-ionic dispersant as the dispersion medium. The particle size information was obtained. The test results are shown in Table 2.
[0065] Example 6
[0066] The preparation method in this embodiment includes the following steps:
[0067] (1) Ultrapure water was prepared using an ultrapure water system to obtain ultrapure water with a resistivity of 18.25 MΩ*cm. The ultrapure water and the mixed amphoteric surfactant detergent were mixed and stirred at a mass-volume percentage of 98:2 to obtain the mixed amphoteric dispersant.
[0068] (2) Prepare a 500 ml glass beaker, take 30 ml of the dispersant obtained in step (1), add 2 mg of asphalt material, and disperse it evenly.
[0069] (3) Disperse the mixed solution obtained in step (2) using an ultrasonic cleaner for 15-20 minutes to obtain an asphalt solution;
[0070] (4) Finally, a laser particle size analyzer was used to test the asphalt under the conditions of non-spherical particles, a stirring rate of 2400 rpm, and a refractive index of pure water of 1.33, with a mixed amphoteric dispersant as the dispersion medium. The particle size information was obtained. The test results are shown in Table 2.
[0071] Comparative Example 1
[0072] The preparation method in this embodiment includes the following steps:
[0073] (1) Prepare a 500 ml sealed container bottle to hold the alcohol;
[0074] (2) Prepare a 100 ml glass beaker, take 30 ml of alcohol from step (1), add 2 mg of coke powder, and disperse it evenly.
[0075] (3) Disperse the mixed solution obtained in step (2) using an ultrasonic cleaner for 15-20 minutes to obtain a coke powder solution.
[0076] (4) Finally, a laser particle size analyzer was used to measure the particle size of the non-spherical particles under the conditions of a stirring rate of 2400 rpm and an alcoholic dispersant with a refractive index of 1.33. The particle size information was obtained. The test results are shown in Table 1.
[0077] Comparative Example 2
[0078] The preparation method in this embodiment includes the following steps:
[0079] (1) Prepare a 500 ml sealed container bottle to hold the alcohol;
[0080] (2) Prepare a 100 ml glass beaker, take 30 ml of alcohol from step (1), add 2 mg of asphalt material, and disperse it evenly.
[0081] (3) Disperse the mixed solution obtained in step (2) using an ultrasonic cleaner for 15-20 minutes to obtain an asphalt solution;
[0082] (4) Finally, a laser particle size analyzer was used to measure the particle size of the non-spherical particles under the conditions of a stirring rate of 2400 rpm and an alcoholic dispersant with a refractive index of 1.33. The particle size information was obtained. The test results are shown in Table 2.
[0083] Comparative Example 3
[0084] The preparation method in this embodiment includes the following steps:
[0085] (1) Ultrapure water was prepared using an ultrapure water system to obtain ultrapure water with a resistivity of 17.25 MΩ*cm. The mixture of ultrapure water and mixed amphoteric surfactant detergent was stirred at a mass-volume percentage of 98:2 to obtain a mixed amphoteric dispersant.
[0086] (2) Prepare a 500 ml glass beaker, take 30 ml of the dispersant obtained in step (1), add 2 mg of coke powder material, and disperse it evenly.
[0087] (3) Disperse the mixed solution obtained in step (2) using an ultrasonic cleaner for 15-20 minutes to obtain a coke powder solution.
[0088] (4) Finally, a laser particle size analyzer was used to detect the coke powder under the conditions of non-spherical particles, a stirring rate of 2400 rpm, and a refractive index of pure water of 1.33, with a mixed amphoteric dispersant as the dispersion medium. The particle size information was obtained. The test results are shown in Table 1.
[0089] Comparative Example 4
[0090] (1) Distilled water was prepared using a distillation apparatus, and the mixture was stirred according to the mass-volume percentage of distilled water and mixed amphoteric surfactant detergent being 98:2, thereby obtaining a mixed amphoteric dispersant;
[0091] (2) Prepare a 500 ml glass beaker, take 30 ml of the ionic dispersant obtained in step (1), add 2 mg of asphalt material, and disperse it evenly.
[0092] (3) Disperse the mixed solution obtained in step (2) using an ultrasonic cleaner for 15-20 minutes to obtain an asphalt solution;
[0093] (4) Finally, a laser particle size analyzer was used to test the asphalt under the conditions of non-spherical particles, a stirring rate of 2400 rpm, and a refractive index of pure water of 1.33, with a mixed amphoteric dispersant as the dispersion medium. The particle size information was obtained. The test results are shown in Table 2.
[0094] Analysis of particle size test results
[0095] Laser particle size distribution test: Particle size distribution analysis was conducted in Examples 1-3 using coke powder as material and in Examples 4-6 using asphalt as material, with ultrapure water and surfactant as dispersion media. Comparative Examples 1, 3 and 2, 4 used coke powder and asphalt as material, with alcohol as dispersion media, and particle size distribution was tested using a laser particle size analyzer. The test results are shown in Tables 1 and 2 below.
[0096] Table 1. Results of coke powder particle size distribution
[0097]
[0098] Table 2. Asphalt particle size distribution results
[0099]
[0100] Studies show that this invention uses ultrapure water as the dispersion medium, with the addition of ionic surfactants, nonionic surfactants, and a mixture of amphoteric surfactants. It was found that the dispersion solution made by mixing ultrapure water with different surfactants can effectively wet the carbon powder material, causing it to emulsify and disperse uniformly in the ultrapure water into a non-agglomerated solution, with particle size data not significantly different from that of alcohol. Furthermore, the extensive data indicates that the effect is best when the dispersant is a mixture of surfactants.
[0101] Research has found that using pure water combined with surfactants as a dispersion medium to replace the traditional alcohol system offers innovative advantages in several aspects, demonstrating significant breakthroughs from technological, environmental, economic, and application perspectives:
[0102] 1. Green Chemistry and Sustainable Development, Non-toxic and Environmentally Friendly: Pure water as a solvent is completely non-toxic, avoiding the emission of volatile organic compounds from alcohols (such as ethanol and isopropanol), meeting stringent global requirements for green chemistry and carbon neutrality. Biodegradability: The preferred environmentally friendly surfactants are 100% biodegradable, while alcohol, although biodegradable, relies on fossil fuels for production, resulting in a higher carbon footprint throughout its life cycle. Industrial Safety: Eliminates the flammability and explosiveness risks of alcohol, reducing fire safety costs during storage, transportation, and production.
[0103] 2. Technological breakthroughs and controllable dispersion stability: Surfactants, through directional adsorption at the particle / droplet interface, form an electric double layer or steric hindrance, allowing for precise control of the zeta potential of the dispersion system. This stability far surpasses the simple solvation effect of alcohol. Broad spectrum compatibility: By selecting ionic or nonionic surfactants, it can be adapted to the dispersion of polar / nonpolar substances, while alcohol is only suitable for certain lipophilic components.
[0104] 3. Economic efficiency and process optimization, resulting in reduced costs: Water is more than 50% cheaper than alcohol, and the amount of surfactant added is typically only 2%-10%, leading to a significant reduction in overall costs. Simplified process: Water systems do not require explosion-proof equipment and can directly utilize conventional stirring, homogenization, or microfluidic technologies, while alcohol systems require strict temperature control and explosion-proof measures (such as low-temperature spray drying). Recycling and reuse: Water can be recovered through simple distillation or membrane separation, while alcohol recovery requires complex condensation processes and is energy-intensive.
[0105] The embodiments described above are merely preferred embodiments of the present invention, and not all feasible embodiments of the present invention. Any obvious modifications made by those skilled in the art without departing from the principles and spirit of the present invention should be considered to be included within the scope of protection of the claims of the present invention.
Claims
1. A method for testing the particle size distribution of toner, characterized in that... A method for testing toner particle size distribution based on dispersants involves uniformly mixing the dispersant with the toner to be tested, then dispersing the mixture in an ultrasonic cleaner for 15-20 minutes until no agglomeration or clumping occurs at the bottom. A laser particle size analyzer is then used to detect the particle size of the toner under the conditions of non-spherical particles and a stirring rate of 2400 rpm, ultimately obtaining the particle size information of the toner to be tested.
2. The method for testing toner particle size distribution as described in claim 1, characterized in that, The dispersion ratio of the dispersant to the toner is 90-98:2-10.
3. The method for testing toner particle size distribution as described in claim 1, characterized in that, wherein... The dispersant includes ultrapure water and surfactant, with a mass-volume percentage of 90-98:2-10 for ultrapure water and surfactant.
4. The method for testing toner particle size distribution as described in claim 3, characterized in that, Ultrapure water is water with a resistivity of 18.25 MΩ*cm.
5. The method for testing toner particle size distribution as described in claim 3, characterized in that, The surfactant can be any one of the following: ionic surfactant, nonionic surfactant, or mixed amphoteric surfactant.
6. The method for testing toner particle size distribution as described in claim 5, characterized in that, The ionic surfactant is sodium dodecyl sulfate.
7. The method for testing toner particle size distribution as described in claim 5, characterized in that, The nonionic surfactant is sodium dodecyl polyoxyethylene ether sulfate.
8. The method for testing toner particle size distribution as described in claim 5, characterized in that, Mixed amphoteric surfactants are used in detergents.