An improved method and device for detecting wear resistance of titanium dioxide

Abstract

The present invention belongs to the technical field of titanium dioxide performance detection, and specifically relates to an improved titanium dioxide wear resistance detection method and device. The method includes the steps of selecting a test object, slurrying, adjusting viscosity, testing and determining wear resistance, and the device includes a stirring tank, the top of which is detachably connected to a top cover, the top cover is provided with a stirring motor, the output shaft of the stirring motor is 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 sleeved with a rubber sleeve, and the bottom of the stirring tank is detachably fixed with a copper mesh. Compared with the prior art, the present invention has a strong timeliness from detection to feedback, and has low detection cost, short detection time, high detection accuracy, and is suitable for promotion and application.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium dioxide performance detection, and in particular relates to an improved 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 generally include 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, disposable consumables, cost approximately 200-250 yuan each, and ink resins are 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 an improved method for detecting the wear resistance of titanium dioxide, 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: add the sand abrasive or wet abrasive in S1 into desalted water and stir to form a slurry with a certain concentration;

[0010] S3. Adjusting viscosity: adjusting the viscosity of the slurry in S2 to 240-250 mPa·s by adding cellulose to obtain a test sample;

[0011] S4. Test: A certain amount of test sample is placed in a container. A weighed copper mesh is detachably fixed to the bottom 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, and the rubber sleeve and the copper mesh are close but not in contact. The variable frequency motor rotates the rotating shaft at a certain speed, driving the slurry to rotate, causing friction between the slurry and the copper mesh. The mass loss of the copper mesh at the specified number of revolutions is calculated and recorded as the wear value.

[0012] S5. Determination of wear resistance: The quality of the product is judged by comparing the wear value of the test results with the wear value of qualified products that have been tested in advance.

[0013] Preferably, in S2, the concentration of the slurry is 445-450 g / L.

[0014] Preferably, in 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, the rotation speed of the rotating shaft is set to 2400 rpm, and the number of rotations of the rotating shaft is set to 50,000 rpm.

[0015] Preferably, in S5, if the wear value of the copper mesh in the test result is ≤22 mg, it is a first-class product; if the wear value is between 22 and 32 mg, it is a qualified product; if the wear value is greater than 32 mg, it is an unqualified product.

[0016] Preferably, in S4, after completing the specified number of revolutions, the copper mesh is removed and excess titanium dioxide is removed by ultrasonic cleaning with pure water, and then the mesh is dried and weighed using an analytical balance. The difference between the two weighing data is the wear value;

[0017] Preferably, in S4, before testing, the temperature of the test sample needs to be cooled to room temperature (below 25°C).

[0018] Preferably, in S4, after the test is completed, the test sample in the container can be returned to the production system for processing.

[0019] Based on another purpose of the present invention, in order to achieve the above-mentioned improved titanium dioxide wear resistance detection method, the present invention proposes an improved titanium dioxide wear resistance detection device, including a stirring tank, the top of the stirring tank is detachably connected to a top cover, the top cover is provided with a stirring motor, the output shaft of the stirring 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 stirring tank is detachably fixed with a copper mesh.

[0020] Preferably, the mixing tank is threadedly connected to the cover body, 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. The bottom of the mixing tank is provided with a slot, and the copper mesh is clamped in the slot. The height of the sleeve can be adjusted by the tightening bolt. Since the copper mesh has a certain flexibility, it can be slightly bent and then clamped in the slot.

[0021] Preferably, an infrared emitter is provided on the rotating shaft, a photoelectric sensor is provided on the inner wall of the stirring tank, an electronic counter and a PLC controller are provided on the outer wall of the stirring tank, the photoelectric sensor is electrically connected to the electronic counter, and the electronic counter and the frequency conversion motor are both electrically connected to the PLC controller, which facilitates the control and measurement of the number of revolutions and speed of the rotating shaft, and helps to improve the detection efficiency.

[0022] The improved titanium dioxide wear resistance detection device is used by first taking a new copper mesh to weigh and record the weight, then taking a certain amount of detection sample and putting it into the mixing tank, then fixing the newly purchased copper mesh on the bottom of the mixing tank, first putting the rubber sleeve on the outside of the sleeve to avoid introducing new metal impurities into the slurry during the mixing process, then adjusting the position of the sleeve on the rotating shaft by tightening the bolt to adjust the gap between the rubber sleeve and the copper mesh, so that the rubber sleeve is close to the copper mesh but not in contact with the copper mesh, then tightening the mixing cover, setting parameters such as the speed and number of revolutions through the PLC controller, and then starting the detection. When the number of revolutions reaches the set value, take out the copper mesh from the mixing tank and rinse it, then weigh the copper mesh twice and record it, the difference between the two weighings is the mass loss of the copper mesh, recorded as the wear value, and comparing the wear value with the wear value of the titanium dioxide that has passed the previous test to judge the wear resistance of the detection sample.

[0023] The present invention also includes other steps, devices, or components that enable its normal implementation, all of which adopt conventional means in the art. In addition, steps, devices, or components not limited to the present invention, such as the infrared emitter, photoelectric sensor, electronic counter, variable frequency motor, PLC controller, and rubber sleeve, all adopt existing technologies in the art. The rubber sleeve and copper mesh in this application can be purchased from the market, and those skilled in the art can select them according to actual needs.

[0024] 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 is. On the contrary, if it is closer to an irregular rhombus, the higher the wear value is. 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 copper mesh in a stirred state after slurrying. This application only needs to use ordinary domestic copper mesh. According to the mass loss of the copper mesh before and after wear under certain rotation conditions, the mass loss is recorded as the wear value. The wear value is compared with the wear value of titanium dioxide that has been tested and qualified in advance, and it can be used to judge the wear resistance of the test sample.

[0025] Compared with the prior art, this application has the following beneficial effects:

[0026] Compared with the existing titanium dioxide ink abrasion test method, the test needs to be carried out on finished products, which is very costly and time-consuming, and there is a lag from testing to feedback production.

[0027] This method has the following innovations:

[0028] (1) Only sand abrasive or wet abrasive in the post-processing section of calcined titanium dioxide is needed for detection. Production can respond in advance and if abnormalities occur, timely adjustments can be made. The timeliness from detection to feedback is very strong;

[0029] (2) Short testing time, the test time is only about 30 minutes, which can greatly shorten the testing time;

[0030] (3) The consumables used in the testing process are ordinary domestic small copper mesh and cheap rubber sleeves, which can reduce the testing cost by about 60%;

[0031] (4) The detection accuracy is high, and the error value of parallel experiments is very small. It can well show the differences in the wear resistance of titanium dioxide and is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic structural diagram of the improved titanium dioxide wear resistance detection device of the present invention in Example 2. DETAILED DESCRIPTION

[0033] The technology of the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0034] Example 1:

[0035] The present invention proposes an improved method for detecting the wear resistance of titanium dioxide, comprising the following steps:

[0036] S1. Selection of test objects: The test was conducted on abrasives from the post-processing stage after calcination in the titanium dioxide production process;

[0037] S2, slurry preparation: add the sand abrasive in S1 to desalted water and stir to form a slurry with a concentration of 445-450 g / L;

[0038] S3. Adjusting viscosity: adjusting the viscosity of the slurry in S2 to 240-250 mPa·s by adding cellulose to obtain a test sample;

[0039] S4. Test: After the temperature of the test sample is cooled to 25°C, 1L of the test sample is taken and placed in a container with a volume of 2L. A weighed copper mesh is detachably fixed at the bottom of the container. A rotating shaft is provided above the container. The rotating shaft is driven by a frequency conversion motor, and 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 to avoid introducing new metal impurities into the slurry during the stirring process. The rubber sleeve is close to but not in contact with the copper mesh. The rotating shaft is rotated at a speed of 2400rpm by the frequency conversion motor to drive the slurry to rotate, causing friction between the slurry and the copper mesh. After the rotating shaft rotates 50,000 times, the copper mesh is removed and the excess titanium dioxide is removed by pure water ultrasound. After drying, it is weighed with an analytical balance. The difference between the two weighing data is the mass loss of the copper mesh, which is recorded as the wear value;

[0040] S5. Determination of wear resistance: In the test results, if the wear value of the copper mesh is ≤22mg, it is a first-class product; if the wear value is between 22 and 32mg, it is a qualified product; if the wear value is greater than 32mg, it is an unqualified product.

[0041] After the test is completed, the test sample in the container can be returned to the production system for processing.

[0042] 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 is. On the contrary, if it is closer to an irregular rhombus, the higher the wear value is. 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 copper mesh in a stirred state after slurrying. This application only needs to use ordinary domestic copper mesh. According to the mass loss of the copper mesh before and after wear under certain rotation conditions, the mass loss is recorded as the wear value. The wear value is compared with the wear value of titanium dioxide that has been tested and qualified in advance, and it can be used to judge the wear resistance of the test sample.

[0043] In this embodiment, because the concentration of titanium dioxide is the condition that most affects the wear value, when the concentration is too low, the measured wear value is low and the error will be large, and when the concentration is too high, problems such as agglomeration and screen blocking are likely to occur. After experimental discussion, it was found that when the concentration of slurry is 445-450g / L, regardless of the titanium dioxide screen blocking situation, the error situation is the best. The experimental results are shown in Table 1 below:

[0044] Table 1 Parallel sample test results when concentration is determined

[0045]

[0046] The inventors found that within the above concentration range, when the viscosity is low, the abrasion value is low, and the final test result value is small. The same experimental error will have a greater impact on the result; when the viscosity is high and greater than 300mPa·s, the material easily blocks the mesh of the copper mesh, resulting in a large experimental error. Finally, after experimental exploration, it was found that when the viscosity of the material is 240-250mPa·s, the impact on the test results is small. The viscosity test results are shown in Table 2 below:

[0047] Table 2 Abrasion test results of the same concentration and different viscosities

[0048]

[0049]

[0050] After selecting the concentration and viscosity, parallel samples were retested. From the test results in Table 3, it can be seen that the test results have good repeatability.

[0051] Table 3 Retest data of parallel samples with the same concentration and viscosity

[0052] serial number Concentration / (g / L) Viscosity / mPa·s Wear value / mg 1 449 245 22.1 2 449 245 21.6 3 449 245 21.7 4 449 245 21.9 5 449 245 21.6

[0053] Example 2:

[0054] like Figure 1 As shown, this embodiment proposes an improved titanium dioxide wear resistance detection device, including a stirring tank 1, the top of the stirring tank is detachably connected to a top cover 2, the top cover is provided with a stirring motor 3, the output shaft of the stirring motor is transmission-connected to a rotating shaft 4, 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 5, the outer side of the sleeve is tightly sleeved with a rubber sleeve 6, the inner diameter of the rubber sleeve is about 2 cm, the outer diameter is 2.2 cm, and the length is 1 cm. The sizes of the sleeve and the rotating shaft match the rubber sleeve, and the bottom of the stirring tank is detachably fixed with a copper mesh 7. This embodiment uses a domestically produced small copper mesh with a diameter of about 7 cm and a thickness of about 1.5 mm.

[0055] Specifically, the mixing tank is threadedly connected to the cover body, and the side wall of the sleeve is provided with a fixing bolt 8. The sleeve is adjustably sleeved on the lower end of the rotating shaft through the fixing bolt. The bottom of the mixing tank is provided with a card slot 9, and the copper mesh is clamped in the card slot. The height of the sleeve can be adjusted by the fixing bolt. Since the copper mesh has a certain flexibility, it can be slightly bent and clamped in the card slot. An infrared emitter 10 is provided on the rotating shaft, a photoelectric sensor 11 is provided on the inner wall of the mixing tank, and an electronic counter 12 and a PLC controller 13 are provided on the outer wall of the mixing tank. The photoelectric sensor is electrically connected to the electronic counter, and the electronic counter and the frequency conversion motor are both electrically connected to the PLC controller, which facilitates the control and measurement of the number of revolutions and speed of the rotating shaft, and helps to improve the detection efficiency.

[0056] The improved titanium dioxide wear resistance detection device is used by first taking a new copper mesh to weigh and record the weight, then taking a certain amount of detection sample and putting it into the mixing tank, then fixing the newly purchased copper mesh on the bottom of the mixing tank, first putting the rubber sleeve on the outside of the sleeve to avoid introducing new metal impurities into the slurry during the mixing process, then adjusting the position of the sleeve on the rotating shaft by tightening the bolt to adjust the gap between the rubber sleeve and the copper mesh, so that the rubber sleeve is close to the copper mesh but not in contact with the copper mesh, then tightening the mixing cover, setting parameters such as the speed and number of revolutions through the PLC controller, and then starting the detection. When the number of revolutions reaches the set value, take out the copper mesh from the mixing tank and rinse it, then weigh the copper mesh twice and record it, the difference between the two weighings is the mass loss of the copper mesh, recorded as the wear value, and comparing the wear value with the wear value of the titanium dioxide that has passed the previous test to judge the wear resistance of the detection sample.

[0057] 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. An improved method for detecting the wear resistance of titanium dioxide, characterized in that: The steps include: S1. Selection of test objects: The test is conducted using sand abrasive or wet abrasive from the post-processing stage after calcination in the titanium dioxide production process; S2. Slurry preparation: Add the sand abrasive or wet abrasive in S1 to desalted water and stir to form a slurry with a concentration of 445-450 g / L; S3. Adjusting viscosity: adjusting the viscosity of the slurry in S2 to 240-250 mPa·s by adding cellulose to obtain a test sample; S4. Test: A certain amount of test sample is placed in a container. A weighed copper mesh is detachably fixed to the bottom 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, and the rubber sleeve and the copper mesh are close but not in contact. The variable frequency motor rotates the rotating shaft at a certain speed, driving the slurry to rotate, causing friction between the slurry and the copper mesh. The mass loss of the copper mesh at the specified number of revolutions is calculated and recorded as the wear value. S5. Determination of wear resistance: The quality of the product is judged by comparing the wear value of the test results with the wear value of qualified products that have been tested in advance.

2. The improved titanium dioxide wear resistance detection method according to claim 1, characterized in that: In 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. The rotation speed of the rotating shaft is set to 2400 rpm, and the number of rotations of the rotating shaft is set to 50,000.

3. The improved method for detecting wear resistance of titanium dioxide according to claim 2, characterized in that: In S5, the copper mesh with a wear value of ≤22mg in the test results is a first-class product; a wear value between 22~32mg is a qualified product; a wear value greater than 32mg is an unqualified product.

4. The improved method for detecting wear resistance of titanium dioxide according to claim 1, wherein: In S4, after completing the specified number of revolutions, the copper mesh is removed and the excess titanium dioxide is removed by ultrasonic cleaning with pure water. After drying, the mesh is weighed using an analytical balance. The difference between the two weighing data is the wear value.

5. The improved method for detecting wear resistance of titanium dioxide according to claim 1, characterized in that: In S4, before testing, the temperature of the test sample needs to be cooled to room temperature.

6. The improved method for detecting wear resistance of titanium dioxide according to claim 1, characterized in that: In S4, after the test is completed, the test sample in the container can be returned to the production system for processing.

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