Characterization method for abradability of titanium dioxide

Abstract

The invention relates to the technical field of titanium dioxide performance detection, in particular to a characterization method for the abradability of titanium dioxide. The characterization method for the abradability of the titanium dioxide comprises the following steps: acquiring the average particle size of a titanium dioxide sample before grinding; obtaining the average particle size of the ground titanium dioxide sample; and evaluating the wear resistance of the titanium dioxide based on the average particle size of the titanium dioxide sample before and after grinding. The method for characterizing the wear resistance of the titanium dioxide can be provided for the market, the wear resistance of the titanium dioxide is evaluated by characterizing the wear resistance of the titanium dioxide according to the change degree of the particle size of the titanium dioxide particles after the titanium dioxide particles are rubbed or impacted, and the wear resistance of the titanium dioxide can be directly detected.

Description

Technical Field

[0001] The present invention relates to the technical field of titanium dioxide performance detection, and particularly relates to a method for characterizing the abrasion resistance of titanium dioxide. Background Art

[0002] Titanium dioxide (titanium dioxide, TiO2), as an important white pigment, is widely used in industries such as inks, plastics, coatings, and papermaking due to its excellent physical and chemical properties. Its high refractive index, excellent hiding power, whiteness, and chemical stability make it an indispensable functional material in these fields. However, in practical applications of titanium dioxide, especially in situations such as coatings and plastics that need to be exposed to the external environment for a long time, its abrasion resistance directly affects the service life and performance stability of the products.

[0003] The abrasion resistance of titanium dioxide refers to the degree of change in the particle size and shape when it is subjected to friction or impact. A lower abrasion value means that the titanium dioxide particles can maintain better stability when subjected to mechanical action, thus maintaining color consistency and coating integrity during long-term use. For example, in coatings, using titanium dioxide with a low abrasion value can significantly extend the service life of the coating, and reduce color changes, gloss reduction, and deterioration of coating performance caused by pigment particle abrasion. Therefore, the abrasion resistance of titanium dioxide is an important indicator that cannot be ignored in its quality evaluation.

[0004] Currently, the test methods for the abrasion resistance of titanium dioxide usually require making it into composite material samples such as coatings and plastics, and then testing the abrasion resistance of these samples. For example, the invention patent application with the application publication number CN111175479A proposes a method for testing the grinding performance of titanium white kiln products. This method indirectly evaluates the grinding performance of titanium dioxide by mixing titanium dioxide with a resin solution to form a slurry, scraping it into a paint film, and then testing its gloss value. However, this method has the following limitations: Indirectness: It needs to be tested by making composite material samples, and cannot directly reflect the abrasion resistance of titanium dioxide particles themselves.

[0005] Complexity: The sample preparation process is cumbersome, involving multiple steps (such as mixing, scraping, drying, etc.), and the test cycle is long.

[0006] Limitations: The test results are affected by auxiliary materials such as resin solutions and glass beads, and it is difficult to accurately reflect the true abrasion resistance of titanium dioxide particles.

[0007] Therefore, developing a method that can directly detect the abrasion resistance of titanium dioxide particles has important practical significance. Summary of the Invention

[0008] In view of this, the present invention provides a method for characterizing the abrasion resistance of titanium dioxide, which can directly evaluate the abrasion resistance of titanium dioxide and at least solve the technical problems of low efficiency and complex operation in the existing abrasion resistance test methods.

[0009] A method for characterizing the abrasion resistance of titanium dioxide according to the present invention includes the following steps: Obtain the average particle size of the titanium dioxide sample before grinding; Obtain the average particle size of the titanium dioxide sample after grinding; Evaluate the abrasion resistance of titanium dioxide based on the average particle sizes of the titanium dioxide samples before and after grinding.

[0010] In some embodiments, evaluating the abrasion resistance of titanium dioxide based on the particle sizes of the titanium dioxide samples before and after grinding includes: Calculate the wear rate based on the average particle sizes of the titanium dioxide samples before and after grinding; Evaluate the abrasion resistance of the titanium dioxide sample according to the size of the wear rate. In this application, the abrasion resistance of titanium dioxide is evaluated by calculating the wear rate, which can provide a quantitative index for the performance of titanium dioxide.

[0011] In some embodiments, the calculation method of the wear rate is: wear rate = (average particle size of the titanium dioxide sample before grinding - average particle size of the titanium dioxide sample after grinding) / average particle size of the titanium dioxide sample before grinding × 100%. This formula represents the wear rate by the ratio of the difference in average particle size before and after grinding to the average particle size before grinding, which can directly reflect the change degree of the particle size of titanium dioxide during the grinding process, thus intuitively reflecting the abrasion situation.

[0012] In some embodiments, evaluating the abrasion resistance of the titanium dioxide sample according to the size of the wear rate includes: The higher the wear rate, the worse the abrasion resistance of the titanium dioxide sample.

[0013] In some embodiments, before obtaining the average particle size of the titanium dioxide sample before grinding, it further includes: Dry the titanium dioxide sample to be tested.

[0014] In some embodiments, drying the titanium dioxide sample to be tested includes: Place the titanium dioxide sample to be tested in an oven at 105°C ± 2°C and dry it for 2 - 3 h to ensure that the moisture is fully volatilized, so that the sample reaches a lower moisture content, thereby more accurately measuring its true particle size.

[0015] In some embodiments, between obtaining the average particle size of the titanium dioxide sample before grinding and obtaining the average particle size of the titanium dioxide sample after grinding, it further includes: Put the titanium dioxide sample into the abrasion tester and set the grinding parameters for grinding. Grinding the titanium dioxide sample with the abrasion tester can simulate the wear situation in the actual use scenario.

[0016] In some embodiments, setting the grinding parameters for grinding includes: setting the load, rotation speed, and number of revolutions of the abrasion tester according to needs. Specifically, it can be selected according to the test requirements. By reasonably setting these parameters, the grinding degree can be precisely controlled to make the titanium dioxide particles reach the expected particle size and distribution.

[0017] In some embodiments, obtaining the average particle size of the titanium dioxide sample before grinding and obtaining the average particle size of the titanium dioxide sample before grinding are obtained by using a laser particle size analyzer, a dynamic light scattering instrument, or a scanning electron microscope.

[0018] In some embodiments, the method for characterizing the abrasion resistance of titanium dioxide further includes: if there are multiple titanium dioxide samples to be tested, number the different titanium dioxide samples to be tested and establish a table to record the wear rate and particle size of different titanium dioxide samples.

[0019] The beneficial effects of the present invention are as follows: This application can provide a method for characterizing the abrasion resistance of titanium dioxide in the market. By characterizing the degree of change in the particle size of titanium dioxide particles after being subjected to friction or impact, the abrasion degree of titanium dioxide is characterized, and then the abrasion resistance of titanium dioxide is evaluated, which can directly detect the abrasion resistance of titanium dioxide. Specifically, this application can accurately calculate the change value of the particle size by obtaining the average particle size of the titanium dioxide sample before and after grinding. Furthermore, the abrasion resistance is characterized according to the change value of the particle size, which can more truly reflect the actual abrasion situation of titanium dioxide during the grinding process and avoid evaluation deviations caused by special changes in local or individual particles. It is convenient to help quickly determine the quality of titanium dioxide, and the operation is simple and convenient. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other embodiments can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a flowchart of the method for characterizing the abrasion resistance of titanium dioxide provided by an embodiment of the present invention. Detailed Embodiments

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the following will further describe the embodiments of the present invention in detail with reference to specific embodiments and the accompanying drawings.

[0023] A method for characterizing the abrasion resistance of titanium dioxide provided by the present invention includes the following steps: Obtain the average particle size of the titanium dioxide sample before grinding; Obtain the average particle size of the titanium dioxide sample after grinding; Evaluate the abrasion resistance of titanium dioxide based on the average particle sizes of the titanium dioxide samples before and after grinding.

[0024] This application can provide a method for characterizing the abrasion resistance of titanium dioxide in the market. By characterizing the degree of change in the particle size of titanium dioxide particles after being subjected to friction or impact, the abrasion degree of titanium dioxide can be characterized, and then the abrasion resistance of titanium dioxide can be evaluated, enabling direct detection of the abrasion resistance of titanium dioxide. Specifically, by obtaining the average particle sizes of the titanium dioxide samples before and after grinding, this application can accurately calculate the change value of the particle size. Then, the abrasion resistance can be characterized based on the change value of the particle size, which can more truly reflect the actual abrasion situation of titanium dioxide during the grinding process and avoid evaluation deviations caused by special changes in local or individual particles.

[0025] In some embodiments, evaluating the abrasion resistance of titanium dioxide based on the particle sizes of the titanium dioxide samples before and after grinding includes: Calculate the wear rate based on the average particle sizes of the titanium dioxide samples before and after grinding; Evaluate the abrasion resistance of the titanium dioxide sample according to the size of the wear rate.

[0026] This application evaluates the abrasion resistance of titanium dioxide by calculating the wear rate, which can provide a quantitative index for the performance of titanium dioxide. The wear rate is calculated based on the average particle sizes of the titanium dioxide samples before and after grinding, and this data is objective and reproducibly measurable, avoiding the influence of subjective factors on the evaluation results.

[0027] In some embodiments, the calculation method of the wear rate is: Wear rate = (Average particle size of the titanium dioxide sample before grinding - Average particle size of the titanium dioxide sample after grinding) / Average particle size of the titanium dioxide sample before grinding × 100%. This formula represents the wear rate as the ratio of the difference in average particle sizes before and after grinding to the average particle size before grinding, which can directly reflect the degree of change in the particle size of titanium dioxide during the grinding process, thus intuitively reflecting the abrasion situation.

[0028] In some embodiments, evaluating the abrasion resistance of the titanium dioxide sample according to the size of the wear rate includes: The higher the wear rate, the worse the abrasion resistance of the titanium dioxide sample. During the production and quality inspection of titanium dioxide, evaluating the abrasion resistance by measuring the wear rate can quickly and effectively screen out products with poor abrasion resistance.

[0029] In some embodiments, before obtaining the average particle size of the titanium dioxide sample before grinding, the method further includes: The titanium dioxide sample to be tested is dried.

[0030] Titanium dioxide samples may contain a certain amount of moisture, which can cause the particles to stick together or agglomerate. This adhesion or agglomeration can lead to inflated results during particle size measurement. Drying removes moisture from the sample, separating the titanium dioxide particles and enabling a more accurate measurement of the actual particle size.

[0031] In some embodiments, drying the titanium dioxide sample to be tested includes: Place the titanium dioxide sample to be tested in an oven at 105℃±2℃ and dry it for 2~3h.

[0032] At 105°C ± 2°C, the free water and some bound water in the titanium dioxide sample gain sufficient energy to convert into water vapor and escape from the sample. A drying time of 2-3 hours ensures sufficient evaporation of the water, resulting in a lower moisture content in the sample, allowing for more accurate measurement of its true particle size.

[0033] In some embodiments, obtaining the average particle size of the titanium dioxide sample before grinding and obtaining the average particle size of the titanium dioxide sample after grinding further includes: Place the titanium dioxide sample in an abraser, which is a device that measures the wear properties of particles, and set the grinding parameters for grinding.

[0034] Titanium dioxide is subject to varying degrees of friction and wear in many practical applications. For example, during the preparation and application of paint, coatings are subject to friction from external objects. In plastic products, titanium dioxide-added plastic parts can also wear when in contact with other objects. Grinding titanium dioxide samples with an abrasion tester can simulate the wear experienced in actual use scenarios.

[0035] The abraser can precisely control grinding parameters such as grinding pressure, speed, time, and type of grinding media. By adjusting these parameters, researchers can deeply study the mechanism of titanium dioxide under different wear conditions.

[0036] In some embodiments, setting the grinding parameters for grinding includes: setting the load, rotation speed, and number of rotations of the abrasion tester as needed. For example, the load range for testing is 250 g to 1000 g, the rotation speed range of the sample test disc is 60 rpm - 70 rpm; the number of rotations range is 1000 - 3000 rotations, which can be specifically selected according to the test requirements. Different combinations of load, rotation speed, and number of rotations will have different degrees of crushing and wear effects on titanium dioxide particles. By reasonably setting these parameters, the grinding degree can be precisely controlled to make the titanium dioxide particles reach the expected particle size and distribution.

[0037] In some embodiments, obtaining the average particle size of the titanium dioxide sample before grinding and obtaining the average particle size of the titanium dioxide sample before grinding are obtained using a laser particle size analyzer, a dynamic light scattering instrument, or a scanning electron microscope. It is preferably obtained using a scanning electron microscope (SEM). The scanning electron microscope (SEM) can not only provide the particle size information of titanium dioxide particles but also simultaneously display the microscopic morphological characteristics of the particles. By scanning the surface of the sample with a high-energy electron beam, signals such as secondary electrons are excited on the surface of the sample, and these signals are collected by the detector and converted into an image. When observing the titanium dioxide sample, information such as the shape of the particles (such as spherical, irregular, etc.), surface roughness, and agglomeration state can be clearly seen. Moreover, through the imaging analysis of individual particles, the actual size of the particles can be measured more accurately, especially in the case of irregular particle shapes, which can more realistically reflect the size of the particles.

[0038] In some embodiments, the method for characterizing the abrasion resistance of titanium dioxide also includes: if there are multiple titanium dioxide samples to be tested, number the different titanium dioxide samples to be tested and establish a table to record the wear rate and particle size change of different titanium dioxide samples. When the wear rate and particle size change data of different titanium dioxide samples are organized in a table, researchers can make intuitive comparisons. By horizontally comparing the wear rates of different numbered samples under the same conditions (such as the same grinding parameters, the same environmental conditions), it is possible to quickly determine which samples have better wear resistance; by vertically comparing the particle size changes of the same sample under different conditions, the sensitivity of the sample to specific conditions (such as different grinding media, different grinding times) can be analyzed.

[0039] The following embodiments are further descriptions of the present invention and do not limit the scope of the present invention.

[0040] A method for characterizing the abrasion resistance of titanium dioxide recorded in this embodiment has the following steps: a. Pretreatment of the sample: Mark the three titanium dioxide samples to be tested as 1#, 2#, and 3# respectively, and place the three titanium dioxide samples in an oven at 105°C ± 2°C for drying for 2 h.

[0041] b. The particle sizes of three titanium dioxide samples were measured using a scanning electron microscope to obtain the average particle size of the titanium dioxide samples before grinding.

[0042] c. The titanium dioxide samples after detection were placed in an abrasion tester, and after setting the grinding parameters, grinding was carried out. Among them, the abrasion tester was set to grind 2000 revolutions under the conditions of a load of 500 g and a rotation speed of the test disc of 60 rpm.

[0043] d. The particle sizes of the three ground titanium dioxide samples were measured using a scanning electron microscope to obtain the average particle size of the ground titanium dioxide samples.

[0044] e. The wear rate was calculated based on the average particle sizes of the titanium dioxide samples before and after grinding.

[0045] f. A table was established to record the wear rates and particle sizes of different titanium dioxide samples to evaluate the wear resistance of titanium dioxide (see Table 1).

[0046] Table 1 Test results of titanium dioxide products 1# - 3# samples

[0047] It can be seen from the analysis of Table 1 that the wear resistance performance of titanium dioxide can be characterized by the method of the present invention. That is, the smaller the wear rate, the better the wear resistance of the titanium dioxide sample. Similarly, the larger the wear rate, the worse the wear resistance of the titanium dioxide sample. This can help users quickly judge the quality of titanium dioxide.

[0048] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0049] The above-described embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A method for characterizing the abrasion resistance of titanium dioxide, characterized in that, It includes the following steps: Obtain the average particle size of the titanium dioxide sample before grinding; Obtain the average particle size of the titanium dioxide sample after grinding; Evaluate the abrasion resistance of titanium dioxide based on the average particle sizes of the titanium dioxide samples before and after grinding.

2. The method for characterizing the abrasion resistance of titanium dioxide according to claim 1, wherein Evaluating the abrasion resistance of titanium dioxide based on the particle sizes of the titanium dioxide samples before and after grinding includes: Calculate the wear rate based on the average particle sizes of the titanium dioxide samples before and after grinding; Evaluate the abrasion resistance of the titanium dioxide sample according to the magnitude of the wear rate.

3. The method for characterizing the abrasion resistance of titanium dioxide according to claim 2, wherein, The calculation method of the wear rate is: wear rate = (average particle size of the titanium dioxide sample before grinding - average particle size of the titanium dioxide sample after grinding) / average particle size of the titanium dioxide sample before grinding × 100%.

4. The method for characterizing the abrasion resistance of titanium dioxide according to claim 2, wherein The evaluating the abrasion resistance of the titanium dioxide sample according to the magnitude of the wear rate includes: The higher the wear rate, the worse the abrasion resistance of the titanium dioxide sample.

5. The method for characterizing the abrasion resistance of titanium dioxide according to claim 1, wherein, Before obtaining the average particle size of the titanium dioxide sample before grinding, it further includes: Perform a drying treatment on the titanium dioxide sample to be tested.

6. The method for characterizing the abrasion resistance of titanium dioxide according to claim 5, wherein, The performing a drying treatment on the titanium dioxide sample to be tested includes: Place the titanium dioxide sample to be tested in an oven at 105°C ± 2°C and dry it for 2 - 3 h.

7. The method for characterizing the abrasion resistance of titanium dioxide according to claim 1, wherein Between obtaining the average particle size of the titanium dioxide sample before grinding and obtaining the average particle size of the titanium dioxide sample after grinding, it further includes: Put the titanium dioxide sample into an abrasion tester, and set the grinding parameters to perform grinding.

8. The method for characterizing the abrasion resistance of titanium dioxide according to claim 7, wherein The setting the grinding parameters to perform grinding includes: setting the load, rotation speed, and number of revolutions of the abrasion tester as needed.

9. The method for characterizing the abrasion resistance of titanium dioxide according to claim 1, wherein The obtaining the average particle size of the titanium dioxide sample before grinding and the obtaining the average particle size of the titanium dioxide sample before grinding are obtained by using a laser particle size analyzer, a dynamic light scattering instrument, or a scanning electron microscope.

10. The method for characterizing the abrasion resistance of titanium dioxide according to claim 1, characterized in that, It further includes: If there are multiple titanium dioxide samples to be tested, number the different titanium dioxide samples to be tested, and establish a table to record the wear rates and particle sizes of different titanium dioxide samples.

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