Preparation process of thermistor ceramic ink for ink-jet printing

Abstract

The invention is applicable to the technical field of ink-jet printing, and provides a preparation process of thermistor ceramic ink for ink-jet printing, which comprises the following steps: step 1, putting a metal oxide raw material into a ball mill, adding absolute ethyl alcohol as a grinding aid, and grinding; 2, putting the ground raw materials into a calcining furnace, and calcining at 850 DEG C to obtain thermistor ceramic powder; step 3, putting the calcined thermistor ceramic powder into a grinding machine, and sieving with a 200-mesh sieve; when raw materials enter the V-shaped space, the raw materials make contact with the filter screen, the qualified ground raw materials are filtered out by the filter screen, excessive grinding of the raw materials is avoided, the grinding efficiency of the raw materials is improved, after the qualified raw materials in the ball-milling roller are discharged, the grinding space is vacated in the ball-milling roller, the raw materials can be continuously put into the ball-milling roller, continuous grinding of the raw materials can be achieved, and the grinding efficiency is improved. And the raw material grinding efficiency is further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of inkjet printing, and particularly relates to a preparation process of a thermistor ceramic ink for inkjet printing. Background Art

[0002] Thermistor ceramic ink is a special ink specifically used for printing ceramic materials, mainly used for the decoration and marking of ceramic products. There are mainly three thermistor ceramic ink preparation technologies: oxide solid-phase ball milling method, reverse microemulsion method and co-precipitation method.

[0003] Among them, the oxide solid-phase ball milling method requires using a ball mill to grind metal oxides for 8-10 hours. For example, a preparation method of a thermistor ceramic ink for inkjet printing disclosed in the existing Chinese invention patent (CN105153808B) uses a ball mill to grind metal oxides for 8 hours. Long-term ball milling can effectively refine raw material particles. For thermistor powder, smaller particle sizes contribute to improving its dispersion stability in the ink. During the ball milling process, the grinding medium (such as zirconia balls) continuously collides and rubs with the raw material particles, making the particles gradually smaller.

[0004] When preparing a thermistor ceramic ink for inkjet printing, the pigment particle size is one of the important factors affecting the performance of ceramic inkjet ink. The size of the pigment directly affects the printing quality of the ink. Excessive particle size easily leads to nozzle blockage and affects the spraying effect; too small particle size, although it can ensure the fluidity performance of the ink, will weaken the coloring ability of the ink and affect the coloring effect of the ink. At the same time, the ideal pigment particle size distribution should be narrow and uniform, avoiding the appearance of a large number of coarse particles or fine particles to ensure the overall stability and consistency of the ink. Usually, the particle size of the pigment in ceramic ink is less than 850 nm, and the average particle size is between 200-300 nm. When preparing the existing thermistor ceramic ink for inkjet printing, due to the long-term treatment of the raw materials by the ball mill, during the long-term grinding process of the metal oxides, some of the qualified raw materials will be repeatedly ground, resulting in over-grinding of the raw materials, making the raw material particle size too small and affecting the coloring effect of the ink. The qualified raw materials will also continuously occupy the grinding space of the ball mill, resulting in the inability to continue adding raw materials into the ball mill for grinding, greatly affecting the preparation efficiency of the thermistor ceramic ink for inkjet printing. Summary of the Invention

[0005] The purpose of the embodiment of the present invention is to provide a preparation process of a thermistor ceramic ink for inkjet printing, aiming to solve the problem that when preparing the existing thermistor ceramic ink for inkjet printing, the ball mill grinds the raw materials for a long time, resulting in over-grinding, making the raw material particle size too small and affecting the coloring effect of the ink.

[0006] The present invention is realized as follows. A preparation process of a thermistor ceramic ink for inkjet printing includes the following steps: Step 1: Put the metal oxide raw materials into a ball mill, and add anhydrous ethanol as a grinding aid for grinding. Step 2: Put the ground raw materials into a calcining furnace and calcine at 850 °C to obtain thermistor ceramic powder. Step 3: Put the calcined thermistor ceramic powder into a grinder and sieve it through a 200-mesh sieve. Step 4: Mix the ground thermistor ceramic powder with an organic solvent, a dispersant, and a binder, and put them into a stirring container for stirring. Step 5: Put the mixed ink into an ultrasonic disperser for ultrasonic treatment. Step 6: Filter the ink after ultrasonic treatment to remove large particles and impurities therein, and then let the ink stand for a period of time to make the bubbles and undispersed particles in the ink float and be removed, obtaining a uniform and stable thermistor ceramic ink. In Step 1, the ball mill includes a protective housing. A ball milling drum is rotatably connected inside the protective housing. A driving assembly for driving the ball milling drum to rotate is arranged on the protective housing. A plurality of notches are annularly and evenly arranged on the side wall of the ball milling drum. Rotating plates are rotatably connected to the plurality of notches. Springs are fixed on the plurality of rotating plates. The ends of the springs are fixed on the ball milling drum. Under the pulling force of the springs, the rotating plates are attached to the ball milling drum. At this time, the inner wall of the ball milling drum and the plurality of rotating plates form a complete ball milling space. A plurality of fixed arc plates are annularly and evenly fixed on the side wall of the ball milling drum. Filter meshes are installed on the fixed arc plates. A pushing assembly is arranged on the inner wall of the protective housing. The pushing assembly is used to drive the rotating plates to rotate.

[0007] In a further technical solution, a workbench is fixed at the lower end of the protective housing. A collecting hopper is fixed on the workbench below the protective housing. A feeding hopper is fixed on the side wall of the protective housing. One end of the ball milling drum is arranged inside the feeding hopper.

[0008] In a further technical solution, the driving assembly includes a rotating shaft rotatably connected to the side wall of the protective housing. A second gear is fixed on the rotating shaft. A first gear is fixed on the side wall of the ball milling drum. The first gear meshes with the second gear. A motor is fixed on the side wall of the protective housing. The rotating end of the motor is fixed to the rotating shaft.

[0009] In a further technical solution, the pushing assembly includes drive shafts fixed to the ends of a plurality of rotating plates, and an arc-shaped pushing plate arranged inside the protective housing.

[0010] Further technical solution: A guide groove is fixed on the inner wall of the protective housing. The extension line of one end of the guide groove coincides with the axis of the ball milling drum. A guide block is slidably connected in the guide groove. The arc-shaped pushing plate is fixed on the guide block. A moving component is arranged on the protective housing, and the moving component is used to drive the guide block to move.

[0011] Further technical solution: The moving component includes an inclined chute arranged on the guide block and an inclined push rod slidably connected in the inclined chute. Two guide shafts are fixed on the side wall of the protective housing. A mounting plate is slidably connected on the two guide shafts. The inclined push rod is fixed on the mounting plate. Fixing plates are fixed at the ends of the two guide shafts. A lead screw is threadedly connected to the fixing plate. One end of the lead screw is rotatably connected to the mounting plate.

[0012] Further technical solution: A limiting ring is fixed inside the protective housing. The transmission shaft is located inside the limiting ring. The limiting ring is provided with a short arc side and a long arc side. When the transmission shaft contacts the short arc side, the rotating plate fits against the side wall of the ball milling drum.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The rotating plate and the fixed arc-shaped plate form a V-shaped space. The raw materials and grinding balls enter the V-shaped space. The V-shaped space can assist the grinding balls in lifting to a certain height, which can reduce the speed of the ball mill and thus reduce energy consumption. 2. When the raw materials enter the V-shaped space, the raw materials contact the filter screen, and the qualified raw materials after grinding are filtered out by the filter screen, thus avoiding excessive grinding of the raw materials and improving the grinding efficiency of the raw materials. 3. After the qualified raw materials in the ball milling drum are discharged, grinding space is vacated in the ball milling drum, and raw materials can be continuously input into the ball milling drum, which can realize continuous grinding of the raw materials and further improve the grinding efficiency of the raw materials. 4. When the ball milling drum drives the rotating plate to move downward, under the pulling force of the tension spring, the rotating plate reverses and fits against the ball milling drum. The rotating plate pushes the raw materials and grinding balls in the V-shaped space back into the ball milling drum, avoiding damage to the filter screen due to the collision of the raw materials and grinding balls in the V-shaped space, protecting the filter screen, and increasing the service life of the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of a ball mill provided by the present invention; Figure 2 is provided by the present invention Figure 1 Internal structural schematic diagram of the workbench, protective housing, collection hopper and feed hopper in Figure 3 is provided by the present invention Figure 2 Schematic structural diagram after removing the workbench, protective housing, collection hopper and feed hopper; Figure 4 Structural schematic diagram of the left - hand side angle provided by the present invention Figure 3 ; Figure 5 Structural schematic diagram of the front - view angle provided by the present invention Figure 3 ; Figure 6 Structural schematic diagram of the sectional view from the A - A perspective in the present invention Figure 5 ; Figure 7 Enlarged structural schematic diagram of B in the present invention Figure 6 ; Figure 8 Structural schematic diagram of the ball - milling drum in the present invention Figure 3 ; Figure 9 Structural schematic diagram of the fixed arc - shaped plate in the present invention Figure 7 ; Figure 10 Structural schematic diagram of the interior of the protective housing in the present invention Figure 1 ; Figure 11 Structural schematic diagram of the moving component in the present invention Figure 3 ; Figure 12 Structural schematic diagram of the rotating plate in the present invention Figure 7 ; Figure 13 Structural schematic diagram of the ball - milling drum in the working state in the present invention Figure 3 ;

[0015] In the drawings: workbench 101, protective housing 102, collection hopper 103, feed hopper 104, ball - milling drum 105, notch 106, rotating plate 107, tension spring 108, transmission shaft 109, fixed arc - shaped plate 110, filter screen 111, arc - shaped push plate 112, drive assembly 2, gear one 201, rotating shaft 202, gear two 203, motor 204, guide groove 301, guide block 302, moving component 4, inclined chute 401, inclined push rod 402, guide shaft 403, mounting plate 404, fixed plate 405, lead screw 406, limit ring 501, short arc side 502, long arc side 503. Detailed implementation manners

[0016] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] The following describes the specific implementation of the present invention in detail with reference to specific embodiments.

[0018] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 12 and Figure 13 shown, a preparation process of a thermistor ceramic ink for inkjet printing provided by an embodiment of the present invention includes the following steps: Step 1: Put the metal oxide raw materials into a ball mill, add anhydrous ethanol as a grinding aid, and grind. The metal oxide can be at least one of cobalt oxide, manganese oxide, nickel oxide, iron oxide, copper oxide, and zinc oxide; Step 2: Put the ground raw materials into a calcination furnace and calcine at 850 °C to obtain thermistor ceramic powder; Step 3: Put the calcined thermistor ceramic powder into a grinder and sieve it through a 200-mesh sieve; Step 4: Mix the ground thermistor ceramic powder with an organic solvent, a dispersant, and a binder, put them into a stirring container and stir. The organic solvent can be one or a mixture of two of deionized water, ethanol, n-pentanol, ethylene glycol, dimethylformamide, dimethyl sulfoxide, n-hexane, or chloroform; the dispersant can be polyethylene glycol 200, polyethylene glycol 400, polyacrylamide, or polyacrylic acid, etc.; the binder can be polyvinyl alcohol, polyvinyl butyral, polyvinylpyrrolidone, or water-soluble starch, etc. According to the mass percentage, the thermistor powder accounts for 3-50 wt% of the total mass of the ceramic ink, the dispersant accounts for 0.3-5 wt% of the thermistor ceramic powder, and the binder accounts for 0.1-10 wt% of the thermistor ceramic powder. Add the thermistor powder, dispersant, and binder to the organic solvent, and use a magnetic stirrer or a mechanical stirrer to stir. The stirring speed is generally 500-2000 r / min, and the stirring time is 30 min-2 h to fully mix the components; Step 5: Put the mixed ink into an ultrasonic disperser for ultrasonic treatment. The ultrasonic power is generally 100-500 W, and the ultrasonic time is 10-60 min to further disperse the powder and make the ink more uniform and stable; Step 6: Filter the ink after ultrasonic treatment through a 0.8 μm or 5 μm filter head to remove large particles and impurities therein, and then let the ink stand for a period of time to make the bubbles and undispersed particles in the ink float and be removed, obtaining a uniform and stable thermistor ceramic ink; The ball mill described in Step 1 includes a protective housing 102. A ball mill drum 105 is rotatably connected inside the protective housing 102. A driving assembly 2 for driving the rotation of the ball mill drum 105 is provided on the protective housing 102. A plurality of notches 106 are annularly and evenly arranged on the side wall of the ball mill drum 105. Rotating plates 107 are rotatably connected to the plurality of notches 106. A tension spring 108 is fixed on each of the plurality of rotating plates 107. The ends of the tension springs 108 are fixed on the ball mill drum 105. Under the pulling force of the tension spring 108, the rotating plate 107 fits on the ball mill drum 105. At this time, the inner wall of the ball mill drum 105 and the plurality of rotating plates 107 form a complete ball milling space. A plurality of fixed arc-shaped plates 110 are annularly and evenly fixed on the side wall of the ball mill drum 105. Filter meshes 111 are installed on the fixed arc-shaped plates 110. A pushing assembly is provided on the inner wall of the protective housing 102. The pushing assembly is used to drive the rotation of the rotating plate 107.

[0019] In an embodiment of the present invention, a metal oxide and grinding balls are put into a ball mill. The driving assembly 2 drives the ball mill drum 105 to rotate. In the initial state, under the pulling force of the tension spring 108, the rotating plate 107 fits against the ball mill drum 105. At this time, the inner wall of the ball mill drum 105 and the plurality of rotating plates 107 form a complete ball milling space. The raw materials are piled up at a corner close to the rotation direction of the ball mill drum 105. When the ball mill drum 105 drives the rotating plate 107 to move upward, the pushing assembly drives the rotating plate 107 to rotate, and the rotating plate 107 rotates outward relative to the ball mill drum 105. During the rotation process, the rotating plate 107 always fits against the fixed arc plate 110, thereby preventing the raw materials in the ball mill drum 105 from leaking out. The rotating plate 107 and the fixed arc plate 110 form a V-shaped space. The raw materials and the grinding balls enter the V-shaped space. The V-shaped space can assist in lifting the grinding balls to a higher height, which can reduce the speed of the ball mill, thereby reducing energy consumption. After the grinding balls and the raw materials move to a high position, they are thrown out from the V-shaped space, and then collisions are generated between the grinder and the raw materials, breaking and refining the raw materials, thereby achieving the effect of grinding the raw materials. When the raw materials enter the V-shaped space, the raw materials contact the filter screen 111. The filter screen 111 uses a 200-mesh screen. The qualified raw materials are filtered out by the filter screen 111, thereby preventing the raw materials from being over-ground and improving the grinding efficiency of the raw materials. Moreover, after the qualified raw materials in the ball mill drum 105 are discharged, a grinding space is vacated in the ball mill drum 105, and raw materials can be continuously put into the ball mill drum 105, enabling continuous grinding of the raw materials and further improving the grinding efficiency of the raw materials. When the ball mill drum 105 drives the rotating plate 107 to move downward, under the pulling force of the tension spring 108, the rotating plate 107 reverses and fits against the ball mill drum 105. The rotating plate 107 pushes the raw materials and the grinding balls in the V-shaped space back into the ball mill drum 105. At this time, the inner wall of the ball mill drum 105 and the plurality of rotating plates 107 form a complete ball milling space, which does not affect the grinding of the raw materials and protects the filter screen 111 from being damaged due to the collision of the raw materials and the grinding balls in the V-shaped space, and can extend the service life of the filter screen 111.

[0020] As Figure 1 , Figure 2 and Figure 10 shown, as a preferred embodiment of the present invention, a workbench 101 is fixed to the lower end of the protective housing 102. A collecting hopper 103 is fixed on the workbench 101 below the protective housing 102. A feed hopper 104 is fixed to the side wall of the protective housing 102. One end of the ball mill drum 105 is arranged in the feed hopper 104.

[0021] In an embodiment of the present invention, the arrangement of the feed hopper 104 facilitates the input of raw materials into the ball mill drum 105. In addition to playing a protective role, the protective housing 102 cooperates with the collecting hopper 103 to collect the ground raw materials.

[0022] As Figures 1 - 4 shown, as a preferred embodiment of the present invention, the driving assembly 2 includes a rotating shaft 202 rotatably connected to the side wall of the protective housing 102. A second gear 203 is fixed on the rotating shaft 202. A first gear 201 is fixed on the side wall of the ball milling drum 105. The first gear 201 meshes with the second gear 203. A motor 204 is fixed on the side wall of the protective housing 102. The rotating end of the motor 204 is fixedly connected to the rotating shaft 202.

[0023] In the embodiment of the present invention, the motor 204 drives the rotating shaft 202 to rotate. The rotating shaft 202 drives the second gear 203 to rotate. The second gear 203 drives the first gear 201 to rotate. The first gear 201 drives the ball milling drum 105 to rotate.

[0024] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 12 shown, as a preferred embodiment of the present invention, the pushing assembly includes a transmission shaft 109 fixedly connected to the ends of a plurality of rotating plates 107, and an arc-shaped pushing plate 112 arranged inside the protective housing 102.

[0025] In the embodiment of the present invention, when the ball milling drum 105 drives the rotating plate 107 to move upward, the transmission shaft 109 contacts the arc-shaped pushing plate 112. The arc-shaped pushing plate 112 pushes the transmission shaft 109 away from the axis of the ball milling drum 105. The transmission shaft 109 drives the rotating plate 107 to rotate. When the ball milling drum 105 drives the rotating plate 107 to move downward, the transmission shaft 109 does not contact the arc-shaped pushing plate 112, and the tension spring 108 pulls the rotating plate 107 to reverse.

[0026] As Figure 4 、 Figure 10 、 Figure 11 and Figure 12As shown, as a preferred embodiment of the present invention, a guiding groove 301 is fixed on the inner wall of the protective housing 102. The extension line of one end of the guiding groove 301 coincides with the axis of the ball milling drum 105. A guiding block 302 is slidably connected in the guiding groove 301. The arc-shaped pushing plate 112 is fixed on the guiding block 302. A moving assembly 4 is arranged on the protective housing 102. The moving assembly 4 is used to drive the guiding block 302 to move. The moving assembly 4 includes an inclined sliding groove 401 arranged on the guiding block 302 and an inclined push rod 402 slidably connected in the inclined sliding groove 401. Two guiding shafts 403 are fixed on the side wall of the protective housing 102. An installation plate 404 is slidably connected on the two guiding shafts 403. The inclined push rod 402 is fixed on the installation plate 404. Fixing plates 405 are fixed at the ends of the two guiding shafts 403. A lead screw 406 is threadedly connected to the fixing plate 405. One end of the lead screw 406 is rotatably connected to the installation plate 404.

[0027] In the embodiment of the present invention, when the lead screw 406 is rotated, under the guiding action of the guiding shaft 403, the lead screw 406 drives the installation plate 404 to move through a threaded transmission method. The installation plate 404 drives the inclined push rod 402 to move. Under the guiding action of the guiding groove 301, the inclined push rod 402 drives the guiding block 302 to move through the inclined sliding groove 401. The guiding block 302 drives the arc-shaped pushing plate 112 to move closer to or away from the axis of the ball milling drum 105. When the arc-shaped pushing plate 112 moves towards the axis of the ball milling drum 105, the upward moving transmission shaft 109 does not contact the arc-shaped pushing plate 112, so that the rotating plate 107 does not rotate. At this time, the raw materials in the ball milling drum 105 are in a closed grinding state, and the filter screen 111 does not screen the ground raw materials; when the guiding block 302 drives the arc-shaped pushing plate 112 to move away from the axis of the ball milling drum 105, when the arc-shaped pushing plate 112 moves towards the axis of the ball milling drum 105, the upward moving transmission shaft 109 contacts the arc-shaped pushing plate 112, so that the rotating plate 107 rotates. At this time, as the ball milling drum 105 rotates, multiple filter screens 111 continuously screen the ground raw materials. By moving the arc-shaped pushing plate 112, the working mode of the ball mill can be changed.

[0028] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 7 and Figure 12 As shown, as a preferred embodiment of the present invention, a limiting ring 501 is fixed in the protective housing 102. The transmission shaft 109 is located inside the limiting ring 501. The limiting ring 501 is provided with a short arc edge 502 and a long arc edge 503. When the transmission shaft 109 contacts the short arc edge 502, the rotating plate 107 fits against the side wall of the ball milling drum 105.

[0029] In the embodiment of the present invention, when the transmission shaft 109 contacts the short arc side 502, the rotating plate 107 fits against the side wall of the ball milling drum 105, thereby avoiding the situation where when the elastic force of the tension spring 108 decreases due to long-term use, the raw materials in the ball milling drum 105 push the rotating plate 107 to rotate by impact, causing the ball milling drum 105 to open. The design of the long arc side 503 can limit the rotation angle of the rotating plate 107. When the transmission shaft 109 contacts the short arc side 502, the rotating plate 107 coincides with the fixed arc plate 110, avoiding the rotating plate 107 rotating out of the fixed arc plate 110 and resulting in the leakage of raw materials in the ball milling drum 105.

[0030] In the above embodiment of the present invention, a ball mill is provided. Metal oxides and grinding balls are put into the ball mill. The motor 204 drives the rotating shaft 202 to rotate. The rotating shaft 202 drives the second gear 203 to rotate. The second gear 203 drives the first gear 201 to rotate. The first gear 201 drives the ball mill drum 105 to rotate. In the initial state, under the pulling force of the tension spring 108, the rotating plate 107 fits against the ball mill drum 105. At this time, the inner wall of the ball mill drum 105 and the plurality of rotating plates 107 form a complete ball milling space. The raw materials are piled up at a corner close to the rotation direction of the ball mill drum 105. When the ball mill drum 105 drives the rotating plate 107 to move upward, the transmission shaft 109 contacts the arc-shaped pushing plate 112. The arc-shaped pushing plate 112 pushes the transmission shaft 109 away from the axis of the ball mill drum 105. The transmission shaft 109 drives the rotating plate 107 to rotate. The rotating plate 107 rotates outward from the ball mill drum 105. During the rotation process, the rotating plate 107 always fits against the fixed arc-shaped plate 110, thus preventing the raw materials in the ball mill drum 105 from leaking out. The rotating plate 107 and the fixed arc-shaped plate 110 form a V-shaped space. The raw materials and the grinding balls enter the V-shaped space. The V-shaped space can assist in lifting the height of the grinding balls, can reduce the speed of the ball mill, and thus reduce energy consumption. After the grinding balls and the raw materials move to a high place, they are thrown out from the V-shaped space, thereby causing collisions between the grinding device and the raw materials, breaking and refining the raw materials, and thus achieving the effect of grinding the raw materials. When the raw materials enter the V-shaped space, the raw materials contact the filter screen 111. The filter screen 111 uses a 200-mesh screen. The qualified raw materials are filtered out by the filter screen 111, thus preventing the raw materials from being over-ground, improving the grinding efficiency of the raw materials. And after the qualified raw materials in the ball mill drum 105 are discharged, a grinding space is vacated in the ball mill drum 105, and raw materials can be continuously put into the ball mill drum 105, and continuous grinding of the raw materials can be realized, further improving the grinding efficiency of the raw materials. When the ball mill drum 105 drives the rotating plate 107 to move downward, under the pulling force of the tension spring 108, the rotating plate 107 reverses and fits against the ball mill drum 105. The rotating plate 107 pushes the raw materials and the grinding balls in the V-shaped space back into the ball mill drum 105. At this time, the inner wall of the ball mill drum 105 and the plurality of rotating plates 107 form a complete ball milling space, thus not affecting the grinding of the raw materials, and preventing the filter screen 111 from being damaged due to the collision of the raw materials and the grinding balls in the V-shaped space, protecting the filter screen 111, and increasing the service life of the filter screen 111.

[0031] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A preparation process of a thermistor ceramic ink for inkjet printing, characterized in that, It includes the following steps: Step 1: Put the metal oxide raw material into a ball mill, add anhydrous ethanol as a grinding aid, and grind it; Step 2: Put the ground raw material into a calcination furnace and calcine it at 850 °C to obtain the thermistor ceramic powder; Step 3: Put the calcined thermistor ceramic powder into a grinder and sieve it through a 200-mesh sieve; Step 4: Mix the ground thermistor ceramic powder with an organic solvent, a dispersant, and a binder, put it into a stirring container and stir; Step 5: Put the mixed ink into an ultrasonic disperser for ultrasonic treatment; Step 6: Filter the ultrasonic-treated ink to remove large particles and impurities therein, then let the ink stand for a period of time to make the bubbles and undispersed particles in the ink float and be removed, obtaining a uniform and stable thermistor ceramic ink; The ball mill described in Step 1 includes a protective housing (102). A ball mill drum (105) is rotatably connected inside the protective housing (102). A driving assembly (2) for driving the ball mill drum (105) to rotate is arranged on the protective housing (102). A plurality of notches (106) are annularly and evenly arranged on the side wall of the ball mill drum (105). A rotating plate (107) is rotatably connected to each of the plurality of notches (106). A tension spring (108) is fixed to each of the plurality of rotating plates (107). The ends of the tension springs (108) are fixed to the ball mill drum (105). Under the pulling force of the tension springs (108), the rotating plates (107) are attached to the ball mill drum (105). At this time, the inner wall of the ball mill drum (105) and the plurality of rotating plates (107) form a complete ball milling space. A plurality of fixed arc plates (110) are annularly and evenly fixed on the side wall of the ball mill drum (105). A filter screen (111) is installed on each of the fixed arc plates (110). A pushing assembly is arranged on the inner wall of the protective housing (102). The pushing assembly is used to drive the rotating plates (107) to rotate.

2. The preparation process of the thermistor ceramic ink for inkjet printing according to claim 1, wherein, A workbench (101) is fixed to the lower end of the protective housing (102). A collection hopper (103) is fixed on the workbench (101) below the protective housing (102). A feed hopper (104) is fixed to the side wall of the protective housing (102). One end of the ball mill drum (105) is arranged inside the feed hopper (104).

3. The preparation process of the thermistor ceramic ink for inkjet printing according to claim 1, characterized in that, The driving assembly (2) includes a rotating shaft (202) rotatably connected to the side wall of the protective housing (102). A second gear (203) is fixed to the rotating shaft (202). A first gear (201) is fixed to the side wall of the ball mill drum (105). The first gear (201) meshes with the second gear (203). A motor (204) is fixed to the side wall of the protective housing (102). The rotating end of the motor (204) is fixedly connected to the rotating shaft (202).

4. The preparation process of the thermistor ceramic ink for inkjet printing according to claim 1, characterized in that, The pushing assembly includes a transmission shaft (109) fixed to the end of each of the plurality of rotating plates (107), and an arc-shaped pushing plate (112) arranged inside the protective housing (102).

5. The preparation process of the thermistor ceramic ink for inkjet printing according to claim 4, characterized in that A guide groove (301) is fixed on the inner wall of the protective housing (102). The extension line of one end of the guide groove (301) coincides with the axis of the ball milling drum (105). A guide block (302) is slidably connected in the guide groove (301). The arc-shaped pushing plate (112) is fixed on the guide block (302). A moving assembly (4) is arranged on the protective housing (102), and the moving assembly (4) is used to drive the guide block (302) to move.

6. The preparation process of the thermistor ceramic ink for inkjet printing according to claim 5, characterized in that, The moving assembly (4) includes an inclined chute (401) arranged on the guide block (302), and an inclined push rod (402) slidably connected in the inclined chute (401). Two guide shafts (403) are fixed on the side wall of the protective housing (102). A mounting plate (404) is slidably connected on the two guide shafts (403). The inclined push rod (402) is fixed on the mounting plate (404). Fixing plates (405) are fixed at the ends of the two guide shafts (403). A lead screw (406) is threadedly connected to the fixing plate (405), and one end of the lead screw (406) is rotatably connected to the mounting plate (404).

7. The preparation process of the thermistor ceramic ink for inkjet printing according to claim 4, characterized in that, A limiting ring (501) is fixed in the protective housing (102). The transmission shaft (109) is located inside the limiting ring (501). The limiting ring (501) is provided with a short arc side (502) and a long arc side (503). When the transmission shaft (109) contacts the short arc side (502), the rotating plate (107) is attached to the side wall of the ball milling drum (105).

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