A low-cost titanium dioxide wear resistance detection method and device

Abstract

The present invention relates to a low-cost titanium dioxide wear resistance detection method and device in the field of titanium dioxide performance detection technology. The method includes the steps of selecting a test object, pulping, testing, and comparative evaluation. The device includes a low-temperature constant temperature tank and a stirring tank. The stirring tank is placed in the low-temperature constant temperature tank, and the top of the stirring tank is detachably connected to a top cover. The top cover is provided with a frequency conversion motor and a controller. The output shaft of the frequency conversion motor is connected to a rotating shaft. The rotating shaft is rotatably connected to the top cover. The lower end of the rotating shaft is detachably connected to a sleeve. The outer side of the sleeve is tightly sleeved with a rubber sleeve. The inner wall bottom of the sleeve is provided with a contact water immersion detector. The rotating shaft is a hollow rotating shaft. The wiring of the contact water immersion detector passes through the rotating shaft and is electrically connected to the controller. A timer is provided in the controller. The present invention can significantly reduce the detection cost, improve the detection efficiency, and can accurately reflect the difference in product wear resistance. It is of great significance for the quality control of ink-grade titanium dioxide in the factory detection link.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium dioxide performance detection, and in particular relates to a low-cost titanium dioxide wear resistance detection method and device. Background Art

[0002] For titanium dioxide specially used in the production of ink industry, the abrasion value of titanium dioxide specially used in ink is one of the key factors in evaluating product quality.

[0003] Currently, in both the ink and titanium dioxide production industries, the typical abrasion test for titanium dioxide specifically formulated for inks is as follows: The titanium dioxide is mixed into an ink slurry. A copper plate is then placed in the slurry and secured, simulating the ink production process. Multiple blades are then scraped against the copper plate in a clockwise direction. The test is completed within a specified number of rotations, and the loss in mass (▲m) of the copper plate before and after the test is calculated, representing the titanium dioxide's abrasion value (and, therefore, its wear resistance).

[0004] A common problem with this method is that it only targets finished titanium dioxide products. The titanium dioxide production process is a complex and lengthy inorganic process. The post-calcination post-processing steps are broadly divided into wet grinding, sand milling, coating, three washes, flash drying, steam pulverization, and finally the finished product. Testing only the finished product can be time-consuming, and testing materials are expensive (special copper plates can only be imported, costing approximately 200-250 yuan each, and are disposable consumables. Resin for ink is also quite expensive). A complete test takes approximately 4-5 hours, resulting in low efficiency.

[0005] Therefore, there is an urgent need to improve the existing titanium dioxide wear resistance testing methods and devices. Summary of the Invention

[0006] The purpose of the present invention is to solve the technical problems in the prior art that the titanium dioxide ink abrasion test method requires the use of finished products for testing, is very costly, time-consuming, and has a lag from testing to feedback production.

[0007] Based on one aspect of the present invention, the present invention proposes a low-cost titanium dioxide wear resistance detection method, comprising the following steps:

[0008] S1. Selection of test objects: The test is conducted using sand abrasives or wet abrasives from the post-calcination process of the titanium dioxide production process.

[0009] S2, slurry preparation: adding the sand abrasive or wet abrasive in step S1 to desalted water and stirring to form a slurry with a certain concentration;

[0010] S3. Test: A certain amount of slurry is taken as a test sample and placed in a container. The container is placed in a low-temperature thermostatic bath. The temperature in the low-temperature thermostatic bath is maintained at 15-17°C. The container is made of wear-resistant steel or a wear-resistant layer is directly applied to the inner wall of the container. A rotating shaft is provided above the container. The rotating shaft is driven by a variable frequency motor. A sleeve is detachably connected to the lower end of the rotating shaft. A rubber sleeve is sleeved on the outer wall of the sleeve. The rubber sleeve is inserted into the slurry in the container. The rubber sleeve is close to but not in contact with the bottom of the container. The frequency conversion motor rotates the rotating shaft at a certain speed, driving the rubber sleeve to rotate, causing friction between the slurry and the rubber sleeve until the rubber sleeve wears and breaks. The time t1 taken for the rubber sleeve to wear and break is recorded.

[0011] S4. Control evaluation: The qualified samples tested by conventional methods are pulped according to step S2 and tested according to step S3, and the time t0 for the corresponding rubber sleeve to wear and break is recorded; if t1 ≥ (t0 ± 60S), the test sample is judged to be qualified, otherwise it is unqualified.

[0012] Preferably, in step S2, the concentration of the slurry is 495-500 g / L.

[0013] Preferably, in step S4, 1 L of the test sample is taken each time and placed in a container with a volume of 2 L to 3 L, and the rotation speed of the rotating shaft is set to 2000 rpm.

[0014] Preferably, in step S4, the temperature of the test sample needs to be cooled to room temperature (below 25° C.) before testing.

[0015] Preferably, in step S4, after the test is completed, the test sample in the container can be returned to the production system for processing.

[0016] Based on another purpose of the present invention, in order to realize the above-mentioned low-cost titanium dioxide wear resistance detection method, the present invention proposes a low-cost titanium dioxide wear resistance detection device, including a low-temperature constant temperature tank and a stirring tank, the stirring tank is placed in the low-temperature constant temperature tank, and the top of the stirring tank is detachably connected to a top cover, the top cover is provided with a variable frequency motor and a controller, the output shaft of the variable frequency motor is transmission-connected to a rotating shaft, the rotating shaft passes through the top cover and extends into the stirring tank, and the rotating shaft is rotatably connected to the top cover, the lower end of the rotating shaft is detachably connected to a sleeve, the outer side of the sleeve is tightly fitted with a rubber sleeve, and the bottom of the inner wall of the sleeve is provided with a contact water immersion detector, the rotating shaft is a hollow rotating shaft, the wiring of the contact water immersion detector passes through the rotating shaft and is electrically connected to the controller, and a timer is provided in the controller.

[0017] Preferably, the mixing tank is connected to the cover body by threads or snaps, and the side wall of the sleeve is provided with a tightening bolt, and the sleeve is adjustably sleeved on the lower end of the rotating shaft through the tightening bolt.

[0018] When using this low-cost titanium dioxide wear resistance test device, a certain amount of slurry is taken as a test sample and placed in a mixing tank. The rubber sleeve is first attached to the outside of the sleeve, and the position of the sleeve on the rotating shaft is adjusted by tightening the bolt to adjust the gap between the rubber sleeve and the bottom wall of the container so that the rubber sleeve is close to the bottom wall of the container but not in contact with it. Then, the stirring cover is tightened, and the speed is set through the controller to start the test. When the contact water immersion detector detects a leak and an alarm is sounded, the PLC controller completes the timing and records the time t1 when the rubber sleeve is damaged and the leak occurs in this test, and stops stirring at the same time. This time is compared with the time t0 of the qualified sample tested in advance, and is corrected according to the experimental error accuracy. When t1 ≥ (t0 ± 60S), the test sample is judged to be qualified; otherwise, it is unqualified. This can be used to quickly evaluate the wear resistance of the test sample.

[0019] The present invention also includes other steps, devices, or components that enable its normal implementation, all of which utilize conventional means in the art. Furthermore, steps, devices, or components not otherwise specified in the present invention, such as the contact water detector, variable frequency motor, controller, rubber sleeve, and low-temperature constant temperature chamber, utilize existing technologies in the art. The rubber sleeves used in this application are commercially available, and those skilled in the art can select them based on their actual needs.

[0020] The working principle of the present invention is that the inventors, through a large amount of basic research, believe that the wear of titanium dioxide comes from two aspects. The first is the particle morphology of titanium dioxide itself. The closer the particle is to a sphere, the lower its wear value. On the contrary, if it is closer to an irregular rhombus, the higher the wear value. The second is the metal impurities in the titanium dioxide production process, which is also an important reason affecting the wear value of titanium dioxide. Based on these two reasons, the inventors thought that there is no need for finished titanium dioxide. Only the sand abrasive or wet abrasive in the post-processing section of titanium dioxide after calcination can be used to evaluate the wear value. This not only saves costs, but also helps the production workshop to respond quickly, thereby controlling product quality. Since titanium dioxide particles are smaller than the micron level, they can rub against the rubber sleeve in a stirring state after slurrying. This application only needs to use ordinary cheap rubber sleeves, compare the time consumed by the rubber sleeve wear when testing the test sample with the time consumed by the rubber sleeve wear when testing the qualified sample, and at the same time judge the wear resistance of the test sample through the error accuracy correction of the experiment. The largest consumable material of the present invention is the rubber sleeve, which is very cheap, and the high-quality and finer ones cost about 40 cents each. Although the test error is higher than that of the existing detection method, the test results are corresponding and the time consumption is short, which is very suitable as a daily detection method.

[0021] Compared with the prior art, this application has the following beneficial effects:

[0022] The low-cost wear resistance testing method described in this method requires only inexpensive rubber sleeves as consumables, which can significantly reduce testing costs and control the testing time to less than 2 hours, thereby significantly improving testing efficiency. Although the test accuracy is slightly reduced, based on the conclusions drawn from a large number of experiments, it can also accurately reflect the differences in product wear resistance. This is of great significance for the quality control of ink-grade titanium dioxide during factory testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of the low-cost titanium dioxide wear resistance detection device of the present invention in Example 2.

[0024] Figure 2 for Figure 1 An enlarged schematic diagram of the G-section structure. DETAILED DESCRIPTION

[0025] The technology of the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0026] Example 1:

[0027] The present invention proposes a low-cost titanium dioxide wear resistance detection method, comprising the following steps:

[0028] S1. Selection of test objects: The test was conducted on abrasives from the post-processing stage after calcination in the titanium dioxide production process;

[0029] S2. Slurry preparation: Add the sand abrasive in step S1 to desalted water and stir to form a slurry with a concentration of 495-500 g / L, which is used as a test sample;

[0030] S3. Test: first cool the temperature of the test sample to below 25°C, take 1L of slurry as the test sample and put it into a 2L container, and place the container in a low-temperature constant temperature bath. The temperature in the low-temperature constant temperature bath is maintained at 15°C. The container is made of wear-resistant steel, and a rotating shaft is provided on the top of the container. The rotating shaft is driven by a frequency conversion motor, and the lower end of the rotating shaft is detachably connected to a sleeve. The outer wall of the sleeve is sleeved with a rubber sleeve, which is inserted into the slurry in the container, and the rubber sleeve is close to but not in contact with the bottom of the container. The frequency conversion motor is used to rotate the rotating shaft at a speed of 2000rpm, driving the rubber sleeve to rotate, causing friction between the slurry and the rubber sleeve until the rubber sleeve is worn and broken, and the time t1 for the rubber sleeve to wear and break is recorded. After the test, the test sample in the container can be returned to the production system for processing.

[0031] S4. Control evaluation: The qualified samples tested by conventional methods are pulped according to step S2 and tested according to step S3, and the time t0 for the corresponding rubber sleeve to wear and break is recorded; if t1 ≥ (t0 ± 60S), the test sample is judged to be qualified, otherwise it is unqualified.

[0032] The working principle of the present invention is that the inventors, through a large amount of basic research, believe that the wear of titanium dioxide comes from two aspects. The first is the particle morphology of titanium dioxide itself. The closer the particle is to a sphere, the lower its wear value. On the contrary, if it is closer to an irregular rhombus, the higher the wear value. The second is the metal impurities in the titanium dioxide production process, which is also an important reason affecting the wear value of titanium dioxide. Based on these two reasons, the inventors thought that there is no need for finished titanium dioxide. Only the sand abrasive or wet abrasive in the post-processing section of titanium dioxide after calcination can be used to evaluate the wear value. This not only saves costs, but also helps the production workshop to respond quickly, thereby controlling product quality. Since titanium dioxide particles are smaller than the micron level, they can rub against the rubber sleeve in a stirring state after slurrying. This application only needs to use ordinary cheap rubber sleeves, compare the time consumed by the rubber sleeve wear when testing the test sample with the time consumed by the rubber sleeve wear when testing the qualified sample, and at the same time judge the wear resistance of the test sample through the error accuracy correction of the experiment. The largest consumable material of the present invention is the rubber sleeve, which is very cheap, and the high-quality and finer ones cost about 40 cents each. Although the test error is higher than that of the existing detection method, the test results are corresponding and the time consumption is short, which is very suitable as a daily detection method.

[0033] In this embodiment, based on a large number of experimental results, when the slurry concentration is high, the sedimentation and flocculation time is faster, and pre-dispersion is required to open the flocculation, which is more complicated. In addition, the test completion time is slightly shorter, and the error will be relatively large. When the slurry concentration is low, the test time will be too long, which is not suitable for routine testing. According to the method of this embodiment, the inventors conducted experimental tests on sand abrasive slurries of different concentrations. The experimental results are shown in Table 1 below:

[0034] Table 1 Test results of different concentrations of sand abrasives

[0035]

[0036] It can be seen from Table 1 that when the slurry concentration is 495-500 g / L, the test time is relatively appropriate, and through a large number of repeated experiments, it is verified that the time error of the test results at this slurry concentration is relatively small.

[0037] The experimental reproducibility results of the same batch of sand abrasive slurry at a concentration of 500g / L are shown in Table 2 below:

[0038] Table 2 Reproducibility results of the same batch of sand abrasives

[0039]

[0040] It can be seen from Table 2 that the test error of this experiment is no more than 60 seconds.

[0041] In order to further verify the reliability of this method, the inventors conducted experiments to verify the correspondence between the detection results of the detection method of the present application and the detection methods in the prior art. The specific experimental data are shown in Table 3 below:

[0042] Table 3 Correspondence between test results and normal wear test method

[0043] serial number Concentration / (g / L) Testing Time Wear / mg 1 495 61 minutes and 50 seconds 18.2 2 496 62 minutes and 9 seconds 18.5 3 497 62 minutes and 57 seconds 18.7 4 498 63 minutes and 11 seconds 18.8 5 499 64 minutes and 39 seconds 18.9 6 500 65 minutes and 49 seconds 19.5 7 501 66 minutes and 20 seconds 19.7

[0044] As can be seen from Table 3, this method has a certain correlation with the original method, and the trends are basically the same.

[0045] Example 2:

[0046] In order to realize the low-cost titanium dioxide wear resistance detection method in Example 1, Figures 1-2 As shown, the present invention proposes a low-cost titanium dioxide wear resistance testing device, comprising a low-temperature constant temperature tank 1 and a stirring tank 2. The stirring tank is placed in the low-temperature constant temperature tank, and a top cover 3 is detachably connected to the top of the stirring tank. The top cover is equipped with a variable frequency motor 4 and a controller 5. The output shaft of the variable frequency motor is connected to a rotating shaft 6 (in this embodiment, specifically using a belt and pulley drive). The rotating shaft passes through the top cover and extends into the stirring tank, and the rotating shaft is rotatably connected to the top cover. The lower end of the rotating shaft is detachably connected to a sleeve 7. The outer side of the sleeve is tightly fitted with a rubber sleeve 8, and the bottom of the inner wall of the sleeve is provided with a contact water immersion detector 9. The rotating shaft is hollow, and the wiring of the contact water immersion detector passes through the shaft and is electrically connected to the controller. The controller is equipped with a timer (not shown in the figure). The stirring tank is threadedly connected to the cover. The side wall of the sleeve is provided with a set screw 10, which is adjustably fitted to the lower end of the rotating shaft via the set screw.

[0047] When using this low-cost titanium dioxide wear resistance test device, a certain amount of slurry is taken as a test sample and placed in a mixing tank. The rubber sleeve is first attached to the outside of the sleeve, and the position of the sleeve on the rotating shaft is adjusted by tightening the bolt to adjust the gap between the rubber sleeve and the bottom wall of the container so that the rubber sleeve is close to the bottom wall of the container but not in contact with it. Then, the stirring cover is tightened, and the speed is set through the controller to start the test. When the contact water immersion detector detects a leak and an alarm is sounded, the PLC controller completes the timing and records the time t1 when the rubber sleeve is damaged and the leak occurs in this test, and stops stirring at the same time. This time is compared with the time t0 of the qualified sample tested in advance, and is corrected according to the experimental error accuracy. When t1 ≥ (t0 ± 60S), the test sample is judged to be qualified; otherwise, it is unqualified. This can be used to quickly evaluate the wear resistance of the test sample.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-cost titanium dioxide wear resistance detection method, characterized in that: The steps include: S1. Selection of test objects: The test is conducted using sand abrasives or wet abrasives from the post-calcination process of the titanium dioxide production process. S2, slurry preparation: adding the sand abrasive or wet abrasive in step S1 to desalted water and stirring to form a slurry with a certain concentration; S3. Test: Take a certain amount of slurry as a test sample and put it into a container. The container is placed in a low-temperature thermostatic bath. The temperature in the low-temperature thermostatic bath is maintained at 15-17°C. The container is made of wear-resistant steel or a wear-resistant layer is directly applied to the inner wall of the container. A rotating shaft is provided above the container. The rotating shaft is driven by a variable frequency motor. The lower end of the rotating shaft is detachably connected to a sleeve. The outer wall of the sleeve is sleeved with a rubber sleeve. The rubber sleeve is inserted into the slurry in the container. The rubber sleeve is close to but not in contact with the bottom of the container. The frequency conversion motor rotates the rotating shaft at a certain speed, driving the rubber sleeve to rotate, causing friction between the slurry and the rubber sleeve until the rubber sleeve wears and breaks. The time t1 taken for the rubber sleeve to wear and break is recorded. S4. Control evaluation: The qualified samples tested by conventional methods are pulped according to step S2 and tested according to step S3, and the time t0 for the corresponding rubber sleeve to wear and break is recorded; if t1 ≥ (t0 ± 60S), the test sample is judged to be qualified, otherwise it is unqualified.

2. The low-cost titanium dioxide wear resistance detection method according to claim 1, characterized in that: In step S2, the concentration of the slurry is 495-500 g / L.

3. The low-cost titanium dioxide wear resistance detection method according to claim 2, characterized in that: In step S4, 1 L of the test sample is taken each time and placed in a container with a volume of 2 L to 3 L, and the rotation speed of the rotating shaft is set to 2000 rpm.

4. The low-cost titanium dioxide wear resistance detection method according to claim 1, characterized in that: In step S4, before testing, the temperature of the test sample needs to be cooled to room temperature.

5. The low-cost titanium dioxide wear resistance detection method according to any one of claims 1 to 4, characterized in that: In step S4, after the test is completed, the test sample in the container can be returned to the production system for processing.

6. A device for implementing the low-cost titanium dioxide wear resistance detection method according to any one of claims 1 to 4, characterized in that: It includes a low-temperature constant temperature tank and a stirring tank. The stirring tank is placed in the low-temperature constant temperature tank, and the top of the stirring tank is detachably connected to a top cover. The top cover is provided with a variable frequency motor and a controller. The output shaft of the variable frequency motor is transmission-connected to a rotating shaft. The rotating shaft passes through the top cover and extends into the stirring tank, and the rotating shaft is rotatably connected to the top cover. The lower end of the rotating shaft is detachably connected to a sleeve. A rubber sleeve is tightly fitted on the outside of the sleeve, and a contact water immersion detector is provided at the bottom of the inner wall of the sleeve. The rotating shaft is a hollow rotating shaft. The wiring of the contact water immersion detector passes through the rotating shaft and is electrically connected to the controller. A timer is provided in the controller.

7. The device according to claim 6, characterized in that: The mixing tank is connected to the top cover by thread or buckle, and the side wall of the sleeve is provided with a fastening bolt, and the sleeve is adjustably sleeved on the lower end of the rotating shaft through the fastening bolt.

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