Preparation process of thermistor ceramic ink for inkjet printing

Abstract

The application is suitable for the field of inkjet printing technology, and provides a preparation process of thermistor ceramic ink for inkjet printing, which comprises the following steps: step one, putting metal oxide raw materials into a ball mill, adding anhydrous ethanol as a grinding aid, and grinding; step two, putting the ground raw materials into a calcining furnace, and calcining at 850 DEG C to obtain thermistor ceramic powder; step three, putting the calcined thermistor ceramic powder into a grinder and sieving through a 200-mesh screen; when the raw materials enter the V-shaped space, the raw materials contact the filter screen, and the qualified raw materials are filtered out by the filter screen, thereby avoiding excessive grinding of the raw materials, improving the grinding efficiency of the raw materials, and after the qualified raw materials in the ball mill cylinder are discharged, the grinding space in the ball mill cylinder is released, the raw materials can be continuously put into the ball mill cylinder, the continuous grinding of the raw materials can be realized, and the grinding efficiency of the raw materials is further improved.

Description

TECHNICAL FIELD

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

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

[0003] The oxide solid-phase ball milling method needs to use 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 an existing Chinese patent (CN105153808B) uses a ball mill to grind metal oxides for 8 hours. Long-time ball milling can effectively refine the particle size of raw materials. For thermistor powder, smaller particle size helps to improve the dispersion stability of the thermistor powder in the ink. During the ball milling process, the grinding medium (such as zirconia balls) and the raw material particles collide and rub with each other, so that the particles gradually become smaller.

[0004] During the preparation of the thermistor ceramic ink for inkjet printing, the particle size of the colorant is one of the important factors affecting the performance of the ceramic inkjet ink. The size of the colorant directly affects the printing quality of the ink. Too large particle size can easily cause nozzle blockage, affecting the jetting effect. Too small particle size can ensure the smooth performance of the ink, but can weaken the color developing ability of the ink, affecting the color developing effect of the ink. At the same time, the ideal colorant particle size distribution should be narrow and uniform, avoiding the presence of a large number of coarse particles or fine particles, so as to ensure the overall stability and consistency of the ink. Generally, the particle size of the colorant of the ceramic ink is less than 850 nm, and the average particle size is between 200-300 nm. During the preparation of the existing thermistor ceramic ink for inkjet printing, the ball mill processes the raw materials for a long time. During the long-time grinding process of the metal oxides, part of the ground raw materials will be repeatedly ground, causing over-grinding of the raw materials, which affects the color developing effect of the ink. The ground raw materials also continuously occupy the grinding space of the ball mill, so that the raw materials cannot be continuously added to the ball mill for grinding, which greatly affects the preparation efficiency of the thermistor ceramic ink for inkjet printing. SUMMARY

[0005] The purpose of the embodiment of the application is to provide a preparation process of a thermistor ceramic ink for inkjet printing, which aims to solve the problem that the ball mill grinds the raw materials for a long time during the preparation of the existing thermistor ceramic ink for inkjet printing, and the raw materials are over-ground, which affects the color developing effect of the ink.

[0006] The application is implemented by a preparation process of a thermistor ceramic ink for inkjet printing, comprising the following steps:

[0007] Step one, put the metal oxide raw material into the ball mill and add anhydrous ethanol as a grinding aid for grinding;

[0008] Step two, put the ground raw material into the calcining furnace and calcine at 850 DEG C to obtain a thermistor ceramic powder;

[0009] Step three, put the calcined thermistor ceramic powder into the grinder and sieve through a 200 mesh screen;

[0010] Step four, mix the ground thermistor ceramic powder with an organic solvent, a dispersing agent and a binder, and put them into a stirring container for stirring;

[0011] Step five, put the mixed ink into an ultrasonic dispersing instrument for ultrasonic treatment;

[0012] Step six, filter the ultrasonically treated ink to remove large particles and impurities, then let the ink stand for a period of time to make the bubbles and undispersed particles in the ink float up and be removed, to obtain a uniform and stable thermistor ceramic ink;

[0013] The ball mill in step one comprises a protective shell, a ball mill drum is rotatably connected in the protective shell, a driving assembly for driving the ball mill drum to rotate is arranged on the protective shell, a plurality of openings are uniformly arranged in annular form on the side wall of the ball mill drum, a plurality of rotating plates are rotatably connected on the openings, a plurality of tension springs are fixed on the rotating plates, the ends of the tension springs are fixed on the ball mill drum, under the action of the tension of the tension springs, the rotating plates are attached to the ball mill drum, at this time, the inner wall of the ball mill drum and the plurality of rotating plates form a complete ball milling space, a plurality of fixed arc-shaped plates are fixed in annular form on the side wall of the ball mill drum, a filter screen is installed on each fixed arc-shaped plate, a pushing assembly is arranged on the inner wall of the protective shell, and the pushing assembly is used to drive the rotating plates to rotate.

[0014] Further technical solutions, the lower end of the protective shell is fixed with a workbench, the workbench is fixed below the protective shell and is provided with a collecting hopper, the side wall of the protective shell is fixed with a feeding hopper, and one end of the ball mill drum is arranged in the feeding hopper.

[0015] Further technical solutions, the driving assembly comprises a rotating shaft rotatably connected on the side wall of the protective shell, a gear two is fixed on the rotating shaft, a gear one is fixed on the side wall of the ball mill drum, the gear one is engaged with the gear two, a motor is fixed on the side wall of the protective shell, and the rotating end of the motor is fixedly connected with the rotating shaft.

[0016] Further technical solutions, the pushing assembly includes a plurality of transmission shafts fixed at the end of the rotating plate, and an arc-shaped pushing plate arranged in the protective shell.

[0017] Further technical solutions, a guide groove is fixed on the inner wall of the protective shell, the extension line of one end of the guide groove coincides with the axis of the ball mill drum, a guide block is slidably connected in the guide groove, the arc-shaped pushing plate is fixed on the guide block, a moving assembly is arranged on the protective shell, and the moving assembly is used to drive the guide block to move.

[0018] Further technical solutions, the moving assembly includes an inclined sliding groove arranged on the guide block, and an inclined pushing rod slidably connected in the inclined sliding groove, two guide shafts are fixed on the side wall of the protective shell, an installation plate is slidably connected on the two guide shafts, the inclined pushing rod is fixed on the installation plate, a fixed plate is fixed at the end of the two guide shafts, a lead screw is threadedly connected on the fixed plate, and one end of the lead screw is rotatably connected on the installation plate.

[0019] Further technical solutions, a limiting ring is fixed in the protective shell, the transmission shaft is located in the limiting ring, a short arc edge and a long arc edge are arranged on the limiting ring, and when the transmission shaft contacts with the short arc edge, the rotating plate is attached to the side wall of the ball mill drum.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] 1. The rotating plate and the fixed arc-shaped plate form a V-shaped space, the raw materials and the grinding balls enter the V-shaped space, the V-shaped space can assist the grinding balls to be lifted to a high position, the speed of the ball mill can be reduced, and the energy consumption can be reduced;

[0022] 2. When the raw materials enter the V-shaped space, the raw materials contact the filter screen, and the qualified raw materials are filtered out by the filter screen, so that the raw materials are prevented from being excessively ground, and the grinding efficiency of the raw materials is improved;

[0023] 3. After the qualified raw materials in the ball mill drum are discharged, the grinding space in the ball mill drum is released, the raw materials can be continuously fed into the ball mill drum, the continuous grinding of the raw materials can be realized, and the grinding efficiency of the raw materials is further improved;

[0024] 4. When the ball mill drum drives the rotating plate to move downward, the rotating plate is reversed and attached to the ball mill drum under the action of the tension of the tension spring, the raw materials and the grinding balls in the V-shaped space are pushed into the ball mill drum again, the filter screen is prevented from being damaged due to the collision of the raw materials and the grinding balls in the V-shaped space, the filter screen is protected, and the service life of the filter screen is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A structural schematic view of a ball mill is provided for the present application;

[0026] Figure 2 The working table, the protective shell, the collecting hopper and the feeding hopper provided by the present application Figure 1 The internal structure schematic diagram of the working table, the protective shell, the collecting hopper and the feeding hopper;

[0027] Figure 3 The working table, the protective shell, the collecting hopper and the feeding hopper provided by the present application Figure 2 The structure schematic diagram after removing the working table, the protective shell, the collecting hopper and the feeding hopper;

[0028] Figure 4 The working table, the protective shell, the collecting hopper and the feeding hopper provided by the present application Figure 3 The structure schematic diagram of the left side angle;

[0029] Figure 5 The working table, the protective shell, the collecting hopper and the feeding hopper provided by the present application Figure 3 The structure schematic diagram of the front view angle;

[0030] Figure 6 The working table, the protective shell, the collecting hopper and the feeding hopper provided by the present application Figure 5 The sectional structure schematic diagram of the A-A view;

[0031] Figure 7 The working table, the protective shell, the collecting hopper and the feeding hopper provided by the present application Figure 6 The enlarged structure schematic diagram of the B;

[0032] Figure 8 The working table, the protective shell, the collecting hopper and the feeding hopper provided by the present application Figure 3 The structure schematic diagram of the ball mill roller;

[0033] Figure 9 The working table, the protective shell, the collecting hopper and the feeding hopper provided by the present application Figure 7 The structure schematic diagram of the fixed arc plate;

[0034] Figure 10 The working table, the protective shell, the collecting hopper and the feeding hopper provided by the present application Figure 1 The internal structure schematic diagram of the protective shell;

[0035] Figure 11 The working table, the protective shell, the collecting hopper and the feeding hopper provided by the present application Figure 3 The structure schematic diagram of the moving assembly;

[0036] Figure 12 The working table, the protective shell, the collecting hopper and the feeding hopper provided by the present application Figure 7 The structure schematic diagram of the rotating plate;

[0037] Figure 13 The working table, the protective shell, the collecting hopper and the feeding hopper provided by the present application Figure 3 The structure schematic diagram of the ball mill roller in the working state.

[0038] In the drawings: the workbench 101, the protective shell 102, the collection hopper 103, the feed hopper 104, the ball mill drum 105, the gap 106, the rotating plate 107, the tension spring 108, the transmission shaft 109, the fixed arc plate 110, the filter screen 111, the arc-shaped push plate 112, the driving assembly 2, the gear one 201, the rotating shaft 202, the gear two 203, the motor 204, the guide groove 301, the guide block 302, the moving assembly 4, the inclined chute 401, the inclined push rod 402, the guide shaft 403, the mounting plate 404, the fixed plate 405, the lead screw 406, the limiting ring 501, the short arc edge 502, the long arc edge 503. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0040] The specific implementation of the present application is described in detail below in combination with specific examples.

[0041] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 12 and Figure 13 , a preparation process of a thermistor ceramic ink for inkjet printing is provided for an embodiment of the present application, comprising the following steps:

[0042] Step one, put the metal oxide raw material into the ball mill and 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;

[0043] Step two, put the ground raw material into the calcining furnace and calcine at 850°C to obtain a thermistor ceramic powder;

[0044] Step three, put the calcined thermistor ceramic powder into the grinder and sieve through a 200-mesh screen;

[0045] Step four, the mixed thermistor ceramic powder and organic solvent, dispersant and binder are put into a stirring container for stirring, the organic solvent can be selected from one or mixture of two of deionized water, ethanol, n-amyl alcohol, ethylene glycol, dimethylformamide, dimethyl sulfoxide, n-hexane or chloroform; the dispersant can be selected from polyethylene glycol 200, polyethylene glycol 400, polyacrylamide or polyacrylic acid; the binder can be selected from polyvinyl alcohol, polyvinyl butyral, polyvinyl pyrrolidone or water-soluble starch, etc., the thermistor powder accounts for 3-50wt% of the total mass of the ceramic ink, the dispersant accounts for 0.3-5wt% of the thermistor ceramic powder, and the binder accounts for 0.1-10wt% of the thermistor ceramic powder, the thermistor powder, dispersant and binder are added to the organic solvent, and the magnetic stirrer or mechanical stirrer is used for stirring, the stirring speed is generally 500-2000r / min, and the stirring time is 30min-2h, so that the components are fully mixed;

[0046] Step five, the mixed ink is put into an ultrasonic dispersing instrument for ultrasonic treatment, the ultrasonic power is generally 100-500W, and the ultrasonic time is 10-60min, so as to further disperse the powder and make the ink more uniform and stable;

[0047] Step six, the ink after ultrasonic treatment is filtered through a filter head with a pore size of 0.8μm or 5μm to remove large particles and impurities, and then the ink is left for a period of time, so that the bubbles and undispersed particles in the ink float up and are removed, obtaining the uniform and stable thermistor ceramic ink;

[0048] The ball mill in step one comprises a protective shell 102, a ball mill drum 105 is rotatably connected in the protective shell 102, a driving assembly 2 for driving the ball mill drum 105 to rotate is arranged on the protective shell 102, a plurality of notches 106 are uniformly arranged in annular shape on the side wall of the ball mill drum 105, a rotating plate 107 is rotatably connected on each of the plurality of notches 106, a tension spring 108 is fixed on each of the plurality of rotating plates 107, and the ends of the tension springs 108 are fixed on the ball mill drum 105, under the action of the tension 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-shaped plates 110 are fixed in annular shape on the side wall of the ball mill drum 105, a filter screen 111 is installed on each of the plurality of fixed arc-shaped plates 110, and a pushing assembly is arranged on the inner wall of the protective shell 102, the pushing assembly is used to drive the rotating plates 107 to rotate.

[0049] In the embodiment of the present application, the metal oxide and the grinding ball are put into the ball mill, the driving assembly 2 drives the rotation of the ball mill cylinder 105, in the initial state, under the pulling force of the tension spring 108, the rotating plate 107 is attached to the ball mill cylinder 105, at this time, the inner wall of the ball mill cylinder 105 and the plurality of rotating plates 107 form a complete ball milling space, the raw materials are accumulated near the rotating direction of the ball mill cylinder 105, when the ball mill cylinder 105 drives the rotating plate 107 to move upward, the pushing assembly drives the rotating plate 107 to rotate, the rotating plate 107 rotates outward of the ball mill cylinder 105, and the rotating plate 107 is always attached to the fixed arc-shaped plate 110 during the rotation, so as to avoid the raw materials in the ball mill cylinder 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 ball enter the V-shaped space, the V-shaped space can assist the grinding ball to be lifted to a high position, the speed of the ball mill can be reduced, and the energy consumption is reduced, the grinding ball and the raw materials move to a high position and are thrown out from the V-shaped space, so as to make the grinder collide with the raw materials, the raw materials are broken and refined, and the raw material grinding effect is achieved, when the raw materials enter the V-shaped space, the raw materials contact the filter screen 111, the filter screen 111 adopts a 200-mesh screen, the qualified raw materials are filtered out by the filter screen 111, so as to avoid excessive grinding of the raw materials and improve the raw material grinding efficiency, and after the qualified raw materials in the ball mill cylinder 105 are discharged, the grinding space in the ball mill cylinder 105 is released, the raw materials can continue to be put into the ball mill cylinder 105, the continuous grinding of the raw materials can be realized, and the raw material grinding efficiency is further improved, when the ball mill cylinder 105 drives the rotating plate 107 to move downward, under the pulling force of the tension spring 108, the rotating plate 107 reverses and is attached to the ball mill cylinder 105, the rotating plate 107 pushes the raw materials and the grinding ball in the V-shaped space into the ball mill cylinder 105 again, at this time, the inner wall of the ball mill cylinder 105 and the plurality of rotating plates 107 form a complete ball milling space, so as to not affect the grinding of the raw materials, and the filter screen 111 is prevented from being damaged due to the collision between the raw materials and the grinding ball in the V-shaped space, the filter screen 111 can be protected, and the service life of the filter screen 111 is improved.

[0050] As shown in Figure 1 , Figure 2 and Figure 10 , as a preferred embodiment of the present application, the protective shell 102 is fixed with a workbench 101 at the lower end, the collecting hopper 103 is fixed below the protective shell 102 on the workbench 101, the feeding hopper 104 is fixed on the side wall of the protective shell 102, and one end of the ball mill cylinder 105 is arranged in the feeding hopper 104.

[0051] In the embodiment of the present application, the feeding hopper 104 is arranged, which facilitates the raw materials to be put into the ball mill cylinder 105, the protective shell 102 plays a protective role, and the protective shell 102 cooperates with the collecting hopper 103 to collect the ground raw materials.

[0052] As shown in Figures 1-4 , as a preferred embodiment of the present application, the driving assembly 2 comprises a rotating shaft 202 rotatably connected to the sidewall of the protective shell 102, a gear two 203 fixed on the rotating shaft 202, a gear one 201 fixed on the sidewall of the ball mill roller 105, the gear one 201 engaged with the gear two 203, a motor 204 fixed on the sidewall of the protective shell 102, and the rotating end of the motor 204 fixedly connected with the rotating shaft 202.

[0053] In the embodiment of the present application, the motor 204 drives the rotating shaft 202 to rotate, the rotating shaft 202 drives the gear two 203 to rotate, the gear two 203 drives the gear one 201 to rotate, and the gear one 201 drives the ball mill roller 105 to rotate.

[0054] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 12 , as a preferred embodiment of the present application, the pushing assembly comprises a plurality of transmission shafts 109 fixed at the end of the rotating plate 107, and an arc-shaped pushing plate 112 arranged in the protective shell 102.

[0055] In the embodiment of the present application, when the ball mill roller 105 drives the rotating plate 107 to move upward, the transmission shaft 109 contacts with 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 roller 105, and the transmission shaft 109 drives the rotating plate 107 to rotate; when the ball mill roller 105 drives the rotating plate 107 to move downward, the transmission shaft 109 does not contact with the arc-shaped pushing plate 112, and the tension spring 108 drives the rotating plate 107 to reverse.

[0056] As shown in Figure 4 , Figure 10 , Figure 11 and Figure 12As shown, in a preferred embodiment of the present invention, 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 mill drum 105. A guide block 302 is slidably connected in the guide groove 301. The arc-shaped push plate 112 is fixed on the guide block 302. A moving component 4 is provided on the protective housing 102. The moving component 4 is used to drive the guide block 302 to move. The moving component 4 includes an inclined sliding groove 401 provided on the guide block 302 and an inclined push rod 402 slidably connected in the inclined sliding groove 401. Two guide shafts 403 are fixed on the side wall of the protective housing 102. An installation plate 404 is slidably connected on the two guide shafts 403. The inclined push rod 402 is fixed on the installation plate 404. A fixing plate 405 is fixed at the end of the two guide 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.

[0057] In this embodiment of the invention, rotating the lead screw 406, under the guidance of the guide shaft 403, causes the mounting plate 404 to move via threaded transmission. The mounting plate 404 then moves the inclined push rod 402. Under the guidance of the guide groove 301, the inclined push rod 402 moves the guide block 302 via the inclined sliding groove 401. The guide block 302 causes the arc-shaped push plate 112 to move closer to or further away from the axis of the ball mill drum 105. When the arc-shaped push plate 112 moves towards the axis of the ball mill drum 105, the upward-moving transmission shaft 109 does not contact the arc-shaped push plate 112, thereby causing the rotating plate 1... When the ball mill 107 is not rotating, the raw material inside the ball mill drum 105 is in a closed grinding state, and the filter screen 111 does not screen the grinding raw material. The guide block 302 drives the arc-shaped push plate 112 to move away from the axis of the ball mill drum 105. When the arc-shaped push plate 112 moves towards the axis of the ball mill drum 105, the upward-moving drive shaft 109 contacts the arc-shaped push plate 112, thereby causing the rotating plate 107 to rotate. At this time, as the ball mill drum 105 rotates, multiple filter screens 111 continuously screen the grinding raw material. By moving the arc-shaped push plate 112, the working mode of the ball mill can be changed.

[0058] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 12 As shown, in a preferred embodiment of the present invention, a limiting ring 501 is fixed inside the protective housing 102, and 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 is in contact with the side wall of the ball mill drum 105.

[0059] In the embodiment of the present application, when the transmission shaft 109 is in contact with the short arc edge 502, the rotating plate 107 is in contact with the side wall of the ball mill drum 105, thereby avoiding the situation that when the elastic force of the tension spring 108 is reduced due to long-term use, the raw materials in the ball mill drum 105 push the rotating plate 107 to rotate in a manner of impact, so that the ball mill drum 105 is opened. The design of the long arc edge 503 can limit the rotation angle of the rotating plate 107. When the transmission shaft 109 is in contact with the short arc edge 502, the rotating plate 107 coincides with the fixed arc plate 110, so as to avoid the situation that the rotating plate 107 rotates out of the fixed arc plate 110, and the raw materials in the ball mill drum 105 leak out.

[0060] In the above embodiment of the present application, a ball mill is provided, metal oxide 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 gear two 203 to rotate, the gear two 203 drives the gear one 201 to rotate, the gear one 201 drives the ball mill cylinder 105 to rotate, in the initial state, under the action of the pulling force of the tension spring 108, the rotating plate 107 is attached to the ball mill cylinder 105, at this time, the inner wall of the ball mill cylinder 105 and the plurality of rotating plates 107 form a complete ball milling space, the raw materials are accumulated near a corner in the rotating direction of the ball mill cylinder 105, when the ball mill cylinder 105 drives the rotating plate 107 to move upwards, the transmission shaft 109 is in contact with 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 cylinder 105, the transmission shaft 109 drives the rotating plate 107 to rotate, the rotating plate 107 rotates outward of the ball mill cylinder 105, and the rotating plate 107 is always attached to the fixed arc-shaped plate 110 during the rotating process, so that the raw materials in the ball mill cylinder 105 are prevented 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 the grinding balls to be lifted to a high position, the speed of the ball mill can be reduced, and the energy consumption can be reduced, the grinding balls and the raw materials are thrown out from the V-shaped space after moving to a high position, and then the grinding balls collide with the raw materials, so that the raw materials are broken and refined, thereby achieving the effect of grinding the raw materials, when the raw materials enter the V-shaped space, the raw materials are in contact with the filter screen 111, the filter screen 111 adopts a 200-mesh screen, the qualified raw materials are filtered out by the filter screen 111, so that the raw materials are prevented from being excessively ground, and the grinding efficiency of the raw materials is improved, and after the qualified raw materials in the ball mill cylinder 105 are discharged, the grinding space in the ball mill cylinder 105 is released, the raw materials can continue to be put into the ball mill cylinder 105, the continuous grinding of the raw materials can be realized, and the grinding efficiency of the raw materials is further improved, when the ball mill cylinder 105 drives the rotating plate 107 to move downwards, under the action of the pulling force of the tension spring 108, the rotating plate 107 is reversed and attached to the ball mill cylinder 105, the rotating plate 107 pushes the raw materials and the grinding balls in the V-shaped space into the ball mill cylinder 105 again, at this time, the inner wall of the ball mill cylinder 105 and the plurality of rotating plates 107 form a complete ball milling space, so that the grinding of the raw materials is not affected, and the filter screen 111 is prevented from being damaged due to the collision between the raw materials and the grinding balls in the V-shaped space, the filter screen 111 can be protected, and the service life of the filter screen 111 is improved.

[0061] The above merely provides the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A process for preparing a thermistor ceramic ink for inkjet printing, characterized in that, It comprises the following steps: Step one, the metal oxide raw materials are put into a ball mill, and anhydrous ethanol is added as a grinding aid, and grinding is carried out; Step two, the ground raw materials are put into a calcining furnace and calcined at 850°C to obtain thermistor ceramic powder; Step three, the calcined thermistor ceramic powder is put into a grinder and sieved through a 200-mesh screen; Step four, the ground thermistor ceramic powder is mixed with an organic solvent, a dispersant and a binder, and put into a stirring container for stirring; Step five, the mixed ink is put into an ultrasonic dispersing instrument for ultrasonic treatment; Step six, the ink after ultrasonic treatment is filtered to remove large particles and impurities, and then the ink is left to stand for a period of time, so that the bubbles and undispersed particles in the ink float up and are removed, to obtain uniform and stable thermistor ceramic ink. The ball mill in step one comprises a protective shell (102), a ball mill drum (105) is rotatably connected in the protective shell (102), a driving assembly (2) for driving the ball mill drum (105) to rotate is arranged on the protective shell (102), a plurality of notches (106) are uniformly arranged in a ring shape on the side wall of the ball mill drum (105), a plurality of rotating plates (107) are rotatably connected to the notches (106), a plurality of tension springs (108) are fixed to the rotating plates (107), and the ends of the tension springs (108) are fixed to the ball mill drum (105). Under the action of the tension 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-shaped plates (110) are fixed in a ring shape on the side wall of the ball mill drum (105), and a filter screen (111) is arranged on each fixed arc-shaped plate (110). A pushing assembly is arranged on the inner wall of the protective shell (102), and the pushing assembly is used to drive the rotating plates (107) to rotate.

2. The process for preparing a thermistor ceramic ink for inkjet printing according to claim 1, characterized in that, A workbench (101) is fixed to the lower end of the protective shell (102), a collection hopper (103) is fixed below the protective shell (102) on the workbench (101), and a feeding hopper (104) is fixed to the side wall of the protective shell (102). One end of the ball mill drum (105) is arranged in the feeding hopper (104).

3. The process for preparing a thermistor ceramic ink for inkjet printing according to claim 1, characterized in that, The driving assembly (2) comprises a rotating shaft (202) rotatably connected to the side wall of the protective shell (102), a gear two (203) fixed to the rotating shaft (202), a gear one (201) fixed to the side wall of the ball mill drum (105), and a motor (204) fixed to the side wall of the protective shell (102). The rotating end of the motor (204) is fixedly connected with the rotating shaft (202).

4. The process for preparing a thermistor ceramic ink for inkjet printing according to claim 1, characterized in that, The pushing assembly comprises a plurality of transmission shafts (109) fixed to the ends of the rotating plates (107), and an arc-shaped pushing plate (112) arranged in the protective shell (102).

5. The process for preparing a thermistor ceramic ink for inkjet printing according to claim 4, characterized in that, The inner wall of the protective shell (102) is fixed with a guide groove (301), the extension line of one end of the guide groove (301) coincides with the axis of the ball mill roller (105), the guide groove (301) is slidably connected with a guide block (302), the arc-shaped push plate (112) is fixed on the guide block (302), and the protective shell (102) is provided with a moving assembly (4), which is used to drive the guide block (302) to move.

6. The process for preparing a thermistor ceramic ink for inkjet printing according to claim 5, characterized in that, The moving assembly (4) comprises an inclined sliding groove (401) provided on the guide block (302) and an inclined push rod (402) slidably connected in the inclined sliding groove (401), two guide shafts (403) are fixed on the side wall of the protective shell (102), an installation plate (404) is slidably connected on the two guide shafts (403), the inclined push rod (402) is fixed on the installation plate (404), and the two guide shafts (403) are fixed with a fixed plate (405) at the ends, a lead screw (406) is threadedly connected on the fixed plate (405), and one end of the lead screw (406) is rotatably connected on the installation plate (404).

7. The process for preparing a thermistor ceramic ink for inkjet printing according to claim 4, characterized in that, The inner wall of the protective shell (102) is fixed with a guide groove (301), the extension line of one end of the guide groove (301) coincides with the axis of the ball mill roller (105), the guide groove (301) is slidably connected with a guide block (302), the arc-shaped push plate (112) is fixed on the guide block (302), and the protective shell (102) is provided with a moving assembly (4), which is used to drive the guide block (302) to move.

Images