A method of detecting carbon powder purity

Abstract

The application relates to a method for detecting the purity of carbon powder, belonging to the technical field of purity detection, and comprising the following steps: mixing the carbon powder to be detected and a supporting material to obtain a mixture; baking the mixture to obtain a product loaded with impurities; detecting the purity of the product to obtain the content of impurities; and obtaining the purity of the carbon powder according to the content of impurities; wherein the melting point of the supporting material is higher than the baking temperature; the carbon powder is doped in a material with a known purity and a high melting point, and the mixture is baked at a high temperature; C in the carbon powder is combusted to generate CO or CO2 gas, and the remaining impurities are adsorbed on alumina; and the content of impurities in the alumina is detected to indirectly obtain the content of impurities in the carbon powder.

Description

Technical Field

[0001] This invention belongs to the field of purity detection technology, and specifically relates to a method for detecting the purity of toner. Background Technology

[0002] Inductively coupled plasma atomic emission spectrometry (ICP-AES) is commonly used to detect the content of impurity elements in substances. This method is simple to operate and the results are generally recognized and reliable. However, due to its inherent chemical properties, toner cannot be directly analyzed using ICP-AES to detect impurity elements, and there has long been no effective and standardized method for determining its purity. In the field of powder preparation using toner as a raw material, controlling the impurity content of the product and effectively detecting toner purity are essential. Summary of the Invention

[0003] The purpose of this application is to provide a method for detecting toner purity, so as to solve the current problem that toner purity cannot be detected.

[0004] This invention provides a method for detecting the purity of toner, the method comprising:

[0005] The toner and the loading material are mixed to obtain a mixture;

[0006] The mixture was calcined to obtain a product loaded with impurities;

[0007] The purity of the product was tested to determine the impurity content.

[0008] The purity of the toner is obtained based on the impurity content.

[0009] The melting point of the load is higher than the calcination temperature.

[0010] Optionally, the melting point of the load is greater than 1000°C.

[0011] Optionally, the melting point of the load is greater than 1500°C.

[0012] Optionally, the melting point of the load is greater than 2000°C.

[0013] Optionally, the loading material is alumina.

[0014] Optionally, the mixing ratio of the toner to be tested and the loading material is 2:1 to 1:2.

[0015] Optionally, the calcination temperature is 600℃-700℃.

[0016] Optionally, the roasting temperature is 650℃.

[0017] Optionally, the method further includes:

[0018] The purity of the loading material is obtained by performing purity testing.

[0019] Optionally, the purity detection device is an ICP emission spectrometer.

[0020] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0021] The method for detecting the purity of toner provided in this invention involves doping toner with a substance of known purity and a high melting point, calcining the mixture at a high temperature, burning the carbon in the toner to generate CO or CO2 gas, and releasing the remaining impurities onto alumina. The impurity content of the toner can be indirectly determined by detecting the impurity content in the alumina.

[0022] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a flowchart of the method provided in an embodiment of the present invention. Detailed Implementation

[0025] The present invention will be described in detail below with reference to specific embodiments and examples, thereby making the advantages and various effects of the present invention more clearly apparent. Those skilled in the art should understand that these specific embodiments and examples are for illustrative purposes only and are not intended to limit the present invention.

[0026] Throughout this specification, unless otherwise specified, the terminology used herein should be understood as having the meaning commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In the event of any conflict, this specification shall prevail.

[0027] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0028] The technical solution of this application embodiment is to solve the above-mentioned technical problems, and the general idea is as follows:

[0029] According to a typical embodiment of the present invention, a method for detecting the purity of toner is provided, the method comprising:

[0030] S0. The purity of the loading material is determined by purity testing.

[0031] S1. Mix the toner and the loading material to obtain a mixture;

[0032] In some embodiments, the melting point of the load is greater than 1000°C, including but not limited to 1000°C, 1100°C, 1200°C, 1300°C, 1400°C, 1500°C, 1600°C, 1700°C, 1800°C, 1900°C, 2000°C and 2100°C, as long as it has a high melting point and does not melt during the calcination process.

[0033] In this embodiment, the loading material can be alumina, which is an inorganic substance with the chemical formula Al2O3. It is a high-hardness compound with a melting point of 2054°C and a boiling point of 2980°C. It is an ionic crystal that can be ionized at high temperatures.

[0034] In some embodiments, the mixing ratio of the toner to be tested and the load is 2:1 to 1:2.

[0035] The mixing ratio of the toner to be tested and the loading material should be controlled at 2:1 to 1:2. At this ratio, the accuracy is highest; ratios that are too high or too low will affect the accuracy of the results. A value that is too high will mask the impurity content of the loading material, leading to overestimation of the results and reduced reliability; a value that is too low will result in excessively low impurity content in the toner, making the results more susceptible to interference from the loading material.

[0036] S2. The mixture is calcined to obtain a product loaded with impurities;

[0037] In some embodiments, the calcination temperature is 600°C-700°C.

[0038] The reason for controlling the calcination temperature at 600℃-700℃ is that under this temperature condition, all carbon in the carbon powder can be removed without affecting the impurity content and adsorption activity of the supported material, resulting in highly reliable results. A value that is too high will reduce the impurity content and adsorption activity of the supported material, while a value that is too low will result in incomplete removal of carbon from the carbon powder. The preferred calcination temperature is 650℃.

[0039] S3. Perform purity testing on the product to obtain the impurity content;

[0040] Specifically, the device used for purity detection is an ICP emission spectrometer.

[0041] The principle of an ICP emission spectrometer is based on a high-frequency current generated by a high-frequency oscillator. This high-frequency current is coupled to a copper tubular coil, internally cooled by water, located at the top of the plasma generating tube. The quartz plasma generating tube contains three coaxial argon gas flow channels. Cooling gas (Ar) flows through the external and central channels, stabilizing the plasma torch and cooling the quartz tube walls to prevent them from melting. The working gas (Ar) is introduced through the central quartz tube. At startup, a high-voltage discharge device ionizes the working gas. As the ionized gas passes through the high-frequency induction coil surrounding the top of the quartz tube, the immense heat and alternating magnetic field generated by the coil cause repeated and violent collisions between electrons, ions, and ground-state neon atoms in the ionized gas. The high-speed motion of these particles leads to complete ionization of the gas, forming a coil-like plasma torch region with temperatures reaching 6000-10000 degrees Celsius. After the sample is processed into a solution, it is transformed into a complete sol by an ultra-nebulizer and introduced into the tube from the bottom. It is then sprayed into the plasma torch through a nozzle via a quartz tube at the center. When the sample aerosol enters the plasma flame, most of it immediately decomposes into excited atomic and ionic states. When these excited-state particles return to their stable ground state, they release a certain amount of energy (manifested as a spectrum of a specific wavelength). By measuring the unique spectral lines and intensities of each element and comparing them with standard solutions, the types and amounts of elements contained in the sample can be determined.

[0042] S4. Obtain the toner purity based on the impurity content.

[0043] The method for detecting toner purity of this application will be described in detail below with reference to embodiments, comparative examples and experimental data.

[0044] Example 1

[0045] A method for detecting the purity of toner, the method comprising:

[0046] The impurity content of 5N grade high-purity alumina was determined by ICP emission spectrometry as follows:

[0047]

[0048] Alumina and carbon powder A were mixed evenly at a mass ratio of 1:1 and then placed in a crucible. The mixture was then calcined in a muffle furnace at 650℃ for 3 hours, cooled to 100℃, and removed. The impurity content of the remaining material was detected using an ICP emission spectrometer.

[0049] The impurity content in the remaining substance was detected by a radiometric spectrometer as follows:

[0050]

[0051] Therefore, the impurity content in toner A can be determined as follows:

[0052]

[0053] Example 2

[0054] A method for detecting the purity of toner, the method comprising:

[0055] The impurity content of 5N grade high-purity alumina was determined by ICP emission spectrometry as follows:

[0056]

[0057] Alumina and carbon powder B were mixed evenly at a mass ratio of 1:1 and then placed in a crucible. The mixture was then calcined in a muffle furnace at 650℃ for 3 hours, cooled to 100℃, and removed. The impurity content of the remaining material was determined using an ICP emission spectrometer. The impurity content of the remaining material as determined by ICP emission spectrometry is as follows:

[0058]

[0059] Therefore, the impurity content in toner B is as follows:

[0060]

[0061] Comparative Example 1

[0062] Compared with Example 1, this comparative example is the same except that the mass ratio of alumina to carbon powder A is 1:10.

[0063] The impurity content in the remaining material was determined using an ICP emission spectrometer as follows:

[0064]

[0065] Therefore, the impurity content in toner B is as follows:

[0066]

[0067] Comparative Example 2

[0068] Compared with Example 1, this comparative example is the same except that the mass ratio of alumina to carbon powder A is 10:1.

[0069] The impurity content in the remaining material was determined using an ICP emission spectrometer as follows:

[0070]

[0071] Therefore, the impurity content in toner B is as follows:

[0072]

[0073] Comparative Example 3

[0074] Compared with Example 2, this comparative example is the same except that the mass ratio of alumina to carbon powder A is 1:10.

[0075] The impurity content in the remaining material was determined using an ICP emission spectrometer as follows:

[0076]

[0077] Therefore, the impurity content in toner B is as follows:

[0078]

[0079] Comparative Example 4

[0080] Compared with Example 2, this comparative example is the same except that the mass ratio of alumina to carbon powder A is 10:1.

[0081] The impurity content in the remaining material was determined using an ICP emission spectrometer as follows:

[0082]

[0083] Therefore, the impurity content in toner B is as follows:

[0084]

[0085] A comparison of the embodiments and comparative examples shows that when a certain parameter is outside the scope of this application, it will amplify the interfering factors, causing deviations in the detection results and reducing accuracy and reliability.

[0086] One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

[0087] (1) The method provided in this embodiment of the invention involves doping carbon powder into a substance with known purity and a high melting point, and calcining the mixture at a high temperature. The carbon in the carbon powder burns to generate CO or CO2 gas and is released. The remaining impurities are adsorbed onto alumina. The impurity content of the carbon powder can be indirectly determined by detecting the impurity content in the alumina, thus overcoming the problem that the purity of carbon powder cannot be measured.

[0088] (2) The method provided in this embodiment of the invention can detect the purity of toner using existing equipment, and the detection results are accurate, reliable, easy to operate and easy to implement.

[0089] Finally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0090] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0091] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for detecting the purity of toner, characterized in that, The method includes: The purity of the loading material was determined by purity testing. The loading material was 5N grade high-purity alumina. The toner and the loading material are mixed to obtain a mixture; The mixture is calcined so that the carbon in the carbon powder burns to produce CO or CO2 gas and is released, and the remaining impurities are adsorbed on the alumina to obtain a product loaded with impurities. The purity of the product was determined by direct purity testing without acid dissolution to obtain the impurity content. The purity of the toner is obtained based on the impurity content. The mixing ratio of the carbon powder to be tested and the loading material is 2:1 to 1:2, and the calcination temperature is 600℃ to 700℃. The purity detection device is an ICP emission spectrometer.

2. The method for detecting toner purity according to claim 1, characterized in that, The roasting temperature is 650℃.

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