A preparation process of highly dispersible ultrafine mica powder

Abstract

The invention relates to the technical field of mica powder preparation, and specifically discloses a preparation process of highly dispersible ultrafine mica powder, comprising the following steps: selecting high-quality mica ore raw material; thoroughly washing jellyfish with clean water to remove impurities, and then using an oven or freeze-drying equipment to perform drying treatment to ensure that the moisture content of the jellyfish is lower than a certain standard; using a mechanical crusher to perform primary crushing to obtain mica particles A; and placing the mica particles A obtained above into a grinding device for secondary crushing to obtain mica powder B. In the preparation process of highly dispersible ultrafine mica powder provided by the invention, when the grinding column is rising, the cleaning ring descends to the lowest point, and then the rotating plate starts to rise and touches the first spiral baffle, forcing the driving gear ring to rotate, and during the rotation of the driving gear ring, the cleaning ring is rotated by the driving gear to scrape the bottom of the grinding column, so that the mica powder adhered to the bottom of the grinding column can be scraped off.

Description

Technical Field

[0001] The invention relates to the technical field of mica powder preparation, and in particular to a preparation process of highly dispersible ultrafine mica powder. Background Art

[0002] Mica powder is a fine powder processed from mica ore, and its main component is mica mineral. Mica is a layered silicate mineral with excellent insulation, heat resistance and chemical stability. Nowadays, people have been studying the preparation process of highly dispersed mica powder, because it can not only be evenly distributed in the substrate to ensure the consistency of the appearance and performance of the coating or material, but also well-dispersed mica powder can better exert its insulation, heat resistance and toughening properties, and improve the comprehensive performance of the final product.

[0003] However, in the process of preparing highly dispersed mica powder, due to defects in the grinding process of the process, the prepared mica powder is not fine enough. In order to obtain highly dispersed ultrafine mica powder, multiple multi-stage grinding is required. In the existing fine grinding device, each time the grinding tool grinds the mica powder, the mica particles will adhere to the tool, causing these mica powders not only to easily fall out of the powder storage tank, but also due to the presence of multiple concave and convex points on the tool, causing some mica powders to not be ground properly or over-ground, resulting in poor overall grinding effect. Summary of the invention

[0004] The purpose of the present invention is to provide a preparation process of highly dispersible ultrafine mica powder to solve the above-mentioned shortcomings in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A preparation process of highly dispersible ultrafine mica powder comprises the following steps:

[0007] S1. Select high-quality mica ore raw materials;

[0008] S2. Wash the mica thoroughly with clean water to remove impurities, and then use an oven or freeze-drying equipment to dry it to ensure that the moisture content of the mica is below a certain standard;

[0009] S3, using a mechanical crusher to perform primary crushing to obtain mica particles A;

[0010] S4, placing the mica particles A obtained above into a grinding device (M) for secondary crushing to obtain mica powder B;

[0011] S5, mixing the mica powder B with the liquid medium using a dispersant to ensure that it is evenly dispersed in the liquid;

[0012] S6, placing the dispersed mica liquid in an oven to dry, to obtain the desired ultrafine mica powder;

[0013] The grinding equipment comprises a hydraulic drive mechanism, a grinding column and a material storage cylinder. The hydraulic drive mechanism is provided with a slag cleaning component, which comprises a cleaning ring. The slag cleaning component is provided with a self-cleaning component, which comprises a scraper.

[0014] Further, in step S4:

[0015] S41, during each lifting process of the grinding column squeezing the mica particles A, the cleaning ring first rotates 160-200 degrees to scrape off the mica powder adhering to the outer wall of the bottom of the grinding column;

[0016] S42, the scraper is rotated 180-360 degrees again to scrape off the mica powder adhering to the top surface of the cleaning ring;

[0017] S43, the cleaning ring is then reversed 160-180 degrees, and the scraper is rotated 180-360 degrees, and this cycle is repeated to evenly grind the mica particles A.

[0018] Further, in step S5:

[0019] S51, mixing the dispersant, mica powder B and water, and placing the mixture in an ultrasonic processor to break up aggregated particles and promote dispersion;

[0020] S52, use a high-speed agitator to mix, increase shear force, and make the particles more evenly distributed;

[0021] S53, check the stability of the dispersion to see if there is precipitation or stratification. If so, continue to add dispersant and mix again;

[0022] S54. Remove undispersed particles by filtering to ensure the purity of the dispersion.

[0023] Furthermore, the dispersant described in step S5 is a polymer dispersant, which is one of polyvinyl alcohol and sodium polyacrylate, to improve dispersion stability.

[0024] Furthermore, the oven temperature in step S6 is set at 80-120° C. and the time is 4-6 hours.

[0025] Furthermore, the bottom of the grinding column is hemispherical, and a grinding groove is provided on the storage barrel, and the inner bottom of the grinding groove is adapted to the bottom of the grinding column.

[0026] Furthermore, the slag cleaning component also includes a pair of driving shafts, a pair of first guide grooves are opened on the grinding column, a slider is slidably connected to the first guide groove, the bottom of the driving shaft is rotatably connected to the outer end of the slider, and one end of the driving shaft is fixedly passed through the cleaning ring.

[0027] Furthermore, a driving component is provided on the slag cleaning component, and the driving component includes a driving gear mounted on a driving shaft, a connecting rod sleeve is movably sleeved on the outside of the driving shaft, and a driving gear ring is rotatably connected to the top of the connecting rod sleeve, a fixed sleeve is provided on the outside of the grinding column, and a rotating drum is rotatably connected to the inner wall of the fixed sleeve, a first spiral baffle is provided on the inner wall of the rotating drum, a push plate is slidably connected to the grinding column, the driving gear ring is meshed with the driving gear, a plurality of levers are fixedly connected to the outer wall of the driving gear ring, and a plurality of driving bars are fixedly connected to the inner wall of the rotating drum.

[0028] Furthermore, the self-cleaning component also includes a threaded sleeve, a threaded groove is provided on the driving shaft, the driving shaft and the threaded sleeve are threadedly connected, the outer wall of the threaded sleeve is fixedly connected with the threaded groove, and the push rod is rotationally connected to the driving gear.

[0029] Furthermore, a reset component is also provided on the slag cleaning component, and the reset component includes a second spiral baffle, and the second spiral baffle is wound in the opposite direction to the first spiral baffle, and an incomplete gear ring is also provided on the driving gear ring.

[0030] In the above technical scheme, the preparation process of highly dispersible ultrafine mica powder provided by the present invention has the beneficial effects of:

[0031] When the grinding column rises, the cleaning ring drops to the lowest point, and then the rotating plate starts to rise and touches the first spiral baffle, forcing the driving gear ring to rotate. During the rotation of the driving gear ring, the cleaning ring is rotated by the driving gear to scrape the bottom of the grinding column, so that the mica powder stuck to the bottom of the grinding column can be scraped off; not only that, by setting a threaded sleeve and a push rod, the driving gear will disengage from the driving gear ring after rotating a set angle, causing the driving gear ring to idle, and the horizontal cleaning ring will be scraped by the scraper, and the cycle continues.

[0032] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0033] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0035] Figure 1 A schematic diagram of the overall structure of a grinding device provided in an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the structure of a grinding column and a material storage barrel provided in an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the external structure of a grinding column provided in an embodiment of the present invention;

[0038] Figure 4 The embodiment of the present invention provides Figure 3 A schematic diagram of the enlarged structure at point A;

[0039] Figure 5 A schematic diagram of the structure of a self-cleaning component provided by an embodiment of the present invention;

[0040] Figure 6 A schematic diagram of a top view of a rotating drum provided in an embodiment of the present invention;

[0041] Figure 7 A bottom-view structural schematic diagram of a rotating drum provided by an embodiment of the present invention;

[0042] Figure 8 A schematic diagram of the internal structure of a drum provided by an embodiment of the present invention;

[0043] Fig. 9 A schematic diagram of the cooperation structure between the push piece and the first spiral baffle provided in an embodiment of the present invention.

[0044] Description of reference numerals:

[0045] 1. Hydraulic drive mechanism; 2. Grinding column; 3. Storage barrel; 31. Grinding groove; 4. Slag cleaning component; 41. Cleaning ring; 42. Driving shaft; 43. First guide groove; 5. Self-cleaning component; 51. Scraper; 52. Threaded sleeve; 53. Threaded groove; 54. Push rod; 55. Limit block; 6. Driving component; 61. Driving gear; 62. Connecting rod sleeve; 63. Driving gear ring; 64. Fixed sleeve; 65. Rotating drum; 66. Push rod; 67. Driving bar; 68. First spiral baffle; 69. Push plate; 691. Plate body; 692. Rotating plate; 693. Linkage plate; 7. Reset component; 71. Second spiral baffle; 72. Incomplete gear ring; 8. Support frame; 9. Connecting plate. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0047] A preparation process of highly dispersible ultrafine mica powder comprises the following steps:

[0048] Select high-quality mica ore raw materials;

[0049] Wash the mica thoroughly with clean water to remove impurities, and then use an oven or freeze-drying equipment to dry it to ensure that the moisture content of the mica is below a certain standard;

[0050] A mechanical crusher is used for primary crushing to obtain mica particles A;

[0051] The mica particles A obtained above are placed in a grinding device M for secondary crushing to obtain mica powder B;

[0052] Mix the mica powder B with the liquid medium using a dispersant to ensure that it is evenly dispersed in the liquid;

[0053] The dispersed mica liquid is placed in an oven for drying to obtain the desired ultrafine mica powder;

[0054] See also Figure 1 The grinding equipment M includes a hydraulic drive mechanism 1, a grinding column 2, and a storage barrel 3. The hydraulic drive mechanism 1 is provided with a slag cleaning component 4, and the slag cleaning component 4 includes a cleaning ring 41. The slag cleaning component 4 is provided with a self-cleaning component 5, and the self-cleaning component 5 includes a scraper 51.

[0055] Specifically, it also includes a support frame 8, the bottom of the support frame 8 is fixedly connected to the hydraulic drive mechanism 1, and the hydraulic drive mechanism 1 is a hydraulic cylinder. The force and travel speed are controlled by a controller to make the grinding effect controllable.

[0056] In the above steps,

[0057] During each lifting process of the grinding column 2 squeezing the mica particles A, the cleaning ring 41 first rotates 160-200 degrees to scrape off the mica powder adhering to the outer wall of the bottom of the grinding column 2;

[0058] The scraper 51 rotates 180-360 degrees again to scrape off the mica powder adhering to the top surface of the cleaning ring 41;

[0059] Then, the cleaning ring 41 is reversed by 160-180 degrees, and the scraper 51 is rotated by 180-360 degrees, and this cycle is repeated to evenly grind the mica particles A.

[0060] In the above steps,

[0061] The dispersant, mica powder B and water are mixed and placed in an ultrasonic processor to break up aggregated particles and promote dispersion;

[0062] Use a high-speed agitator for mixing to increase shear force and make the particles more evenly distributed;

[0063] Check the stability of the dispersion and observe whether there is precipitation or stratification. If so, continue to add dispersant and mix again;

[0064] Undispersed particles are removed by filtration to ensure the purity of the dispersion.

[0065] The dispersant in step S5 is a polymer dispersant, which is one of polyvinyl alcohol and sodium polyacrylate, to improve dispersion stability.

[0066] The dispersant can also be a non-ionic surfactant, such as polyethers and fatty alcohol polyoxyethylene ethers, which have a good dispersing effect on different types of particles and will not affect the charge characteristics of the system; anionic surfactants, such as sodium dodecyl sulfate (SDS), are suitable for some systems that require negative charge stabilization; cationic surfactants, such as ammonium benzoate.

[0067] The oven temperature in step S6 is set to 80-120°C for 4-6 hours;

[0068] Specifically, the oven temperature was set at 100°C for 4 hours.

[0069] See also Figure 2 In the figure, the material storage barrel 3 is a cross-sectional structure, the bottom of the grinding column 2 is hemispherical, and a grinding groove 31 is opened on the material storage barrel 3, and the inner bottom of the grinding groove 31 is adapted to the bottom of the grinding column 2.

[0070] Specifically, the bottom of the grinding column 2 is set to be hemispherical, which can increase the contact area with the mica powder, so that the extruded area is transformed from a plane to a curved surface, thereby improving the grinding effect.

[0071] See also Figure 3-4 In an embodiment further provided by the present invention, the slag cleaning component 4 also includes a pair of driving shafts 42, a pair of first guide grooves 43 are opened on the grinding column 2, a slider (not shown in the figure) is slidably connected to the first guide groove 43, the bottom of the driving shaft 42 is rotatably connected to the outer end of the slider, and one end of the driving shaft 42 is fixedly passed through the cleaning ring 41.

[0072] By setting the first guide groove 43, the cleaning ring 41 can be lifted when the grinding column 2 is grinding the mica powder. When the grinding column 2 is rising, the cleaning ring 41 drops to the lowest point and starts to rotate to scrape the bottom of the grinding column 2 so that the mica powder stuck to the bottom of the grinding column 2 can be scraped off.

[0073] See also Figure 2-6 In an embodiment further provided by the present invention, a driving component 6 is provided on the slag cleaning component 4, and the driving component 6 includes a driving gear 61 on which a driving shaft 42 is sleeved, a connecting rod sleeve 62 is movably sleeved on the outside of the driving shaft 42, and a driving gear ring 63 is rotatably connected to the top of the connecting rod sleeve 62, a fixing sleeve 64 is provided on the outside of the grinding column 2, a connecting plate 9 is fixedly connected between the fixing sleeve 64 and the supporting frame 8, a rotating drum 65 is rotatably connected to the inner wall of the fixing sleeve 64, a first spiral baffle 68 is provided on the inner wall of the rotating drum 65, a push piece 69 is slidably connected to the grinding column 2, the driving gear ring 63 is meshed with the driving gear 61, a plurality of levers 66 are fixedly connected to the outer wall of the driving gear ring 63, and a plurality of driving bars 67 are fixedly connected to the inner wall of the rotating drum 65.

[0074] Specifically, a second guide groove is opened on the grinding column 2, and the push piece 69 is slidably connected to the inside of the second guide groove. The push piece 69 includes a plate body 691 and a rotating plate 692. The plate body 691 and the rotating plate 692 are rotatably connected, and when the plate body 691 and the rotating plate 692 are parallel at 180 degrees, the two are in a conflicting relationship, and the top of the rotating plate 692 is a smooth curved surface; the rotating drum 65 is rotatably connected to the fixed sleeve 64 through the rotating ring on the top, so that the rotating drum 65 can only rotate but cannot slide up and down.

[0075] Specifically, a linkage plate 693 is fixedly connected to the bottom of the plate body 691 , and the linkage plate 693 is rotationally connected to the driving gear ring 63 , and the contact surface is smooth.

[0076] When the grinding column 2 rises and the bottom just exposes the storage barrel 3, the rotating plate 692 touches the first spiral baffle 68. Since the rotating drum 65 can only rotate, the rotating drum 65 rotates with the driving bar 67. At this time, the lever 66 is just inserted between the driving bars 67 and begins to rotate, thereby rotating the driving ring gear 63. During the rotation of the driving ring gear 63, it rotates 180 degrees with the driving gear 61, and the driving gear 61 rotates 180 degrees with the cleaning ring 41, which just scrapes the bottom of the grinding column 2.

[0077] See also Figure 5 In the solution further provided by the present invention, the self-cleaning component 5 also includes a threaded sleeve 52, a threaded groove 53 is provided on the driving shaft 42, the driving shaft 42 and the threaded sleeve 52 are threadedly connected, and a push rod 54 is fixedly connected to the outer wall of the threaded sleeve 52, and the push rod 54 is rotatably connected to the driving gear 61.

[0078] Horizontal guide grooves are formed on both inner sides of the first guide groove 43 . A limit block 55 is slidably connected in the horizontal guide groove. The limit block 55 is fixedly connected to the threaded sleeve 52 , so that the threaded sleeve 52 cannot rotate.

[0079] Since the threaded sleeve 52 is provided, during the rotation of the driving shaft 42, the threaded sleeve 52 will be moved, so that the threaded sleeve 52 moves the driving gear 61 through the push rod 54, so that it no longer meshes with the driving gear ring 63. At this time, the driving gear ring 63 continues to rotate 180 degrees, and the mica powder adhered to the cleaning ring 41 can be scraped off, thereby finally achieving the purpose of self-cleaning of the cleaning ring 41.

[0080] In the solution further provided by the present invention, a reset component 7 is also provided on the slag cleaning component 4, and the reset component 7 includes a second spiral baffle 71, and the second spiral baffle 71 is wound in the opposite direction to the first spiral baffle 68. An incomplete gear ring 72 is also provided on the driving gear ring 63, and the incomplete gear ring 72 is a plurality of latching teeth fixedly connected to the bottom surface of the driving gear ring 63, and there are three of them in this embodiment.

[0081] The included angle of the second spiral baffle 71 is 10-45 degrees, which can just make the driving gear 61 rotate 180 degrees, and is located above the top end of the first spiral baffle 68 .

[0082] Specifically, a reset member is provided between the rotating drum 65 and the fixing sleeve 64 , and the reset member may be an elastic rope.

[0083] Specifically, in this embodiment, the driving gear 61 is provided with 6 gear teeth, and the incomplete gear ring 72 is provided with three gear teeth. When the rotating plate 692 touches the second spiral baffle 71, the driving gear ring 63 will rotate in the opposite direction due to the opposite direction of the spiral, so that the incomplete delay will drive the driving gear 61 in the opposite direction, so that the driving gear 61 retracts again and meshes with the driving gear ring 63, and then the baffle touches the first spiral baffle 68. Such a cycle can make the cleaning ring 41 clean the grinding column 2 multiple times, and itself will also be cleaned multiple times.

[0084] When the grinding column 2 rises to the highest point, the rotating plate 692 is no longer touched, so that the rotating drum 65 is automatically reset.

[0085] When the grinding column 2 moves downward, the rotating plate 692 starts to rotate and no longer squeezes the first spiral baffle 68 and the second spiral baffle 71, so that it falls smoothly. At this time, the driving gear ring 63 and the cleaning ring 41 also move upward under the reaction squeeze of the storage barrel 3, and no longer follow the grinding column 2 downward. The grinding column 2 slowly moves downward to squeeze the mica powder.

[0086] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A process for preparing highly dispersible ultrafine mica powder, characterized in that: The following steps are included: S1. Select mica ore raw materials; S2. Wash the mica ore raw material thoroughly with clean water to remove impurities, and then use an oven or freeze-drying equipment to dry it to ensure that the moisture content of the mica ore is lower than a certain standard; S3, using a mechanical crusher to perform primary crushing to obtain mica particles A; S4, placing the mica particles A obtained above into a grinding device (M) for secondary crushing to obtain mica powder B; S5, mixing the mica powder B with the liquid medium using a dispersant to ensure that it is evenly dispersed in the liquid; S6, placing the dispersed mica liquid in an oven to dry, to obtain the desired ultrafine mica powder; The grinding device (M) comprises a hydraulic drive mechanism (1), a material storage barrel (3) and a slag cleaning component (4); the hydraulic drive mechanism (1) is provided with a grinding column (2), the bottom of the grinding column (2) is hemispherical, the material storage barrel (3) is provided with a grinding groove (31), the inner bottom of the grinding groove (31) is adapted to the bottom of the grinding column (2); The slag cleaning component (4) comprises a cleaning ring (41) and a pair of driving shafts (42); a pair of first guide grooves (43) are formed on the grinding column (2); a slider is slidably connected to the first guide groove (43); the bottom of the driving shaft (42) is rotatably connected to the outer end of the slider; one end of the driving shaft (42) is fixedly connected to the cleaning ring (41); The slag cleaning component (4) is provided with a self-cleaning component (5), and the self-cleaning component (5) comprises a scraper (51); In step S4: S41, during each lifting process of the grinding column (2) squeezing the mica particles A, the cleaning ring (41) first rotates 160-200 degrees to scrape off the mica powder adhering to the outer wall of the bottom of the grinding column (2); S42, the scraper (51) is rotated 180-360 degrees again to scrape off the mica powder adhering to the top surface of the cleaning ring (41); S43, the cleaning ring (41) is then reversed by 160-180 degrees, and the scraper (51) is then rotated by 180-360 degrees, and this cycle is repeated to evenly grind the mica particles A.

2. The preparation process of highly dispersible ultrafine mica powder according to claim 1, characterized in that: In step S5: S51, mixing the dispersant, mica powder B and water, and placing the mixture in an ultrasonic processor to break up aggregated particles and promote dispersion; S52, use a high-speed agitator to mix, increase shear force, and make the particles more evenly distributed; S53, check the stability of the dispersion to see if there is precipitation or stratification. If so, continue to add dispersant and mix again; S54. Remove undispersed particles by filtering to ensure the purity of the dispersion.

3. The preparation process of highly dispersible ultrafine mica powder according to claim 2, characterized in that: The dispersant described in step S5 is a polymer dispersant, which is one of polyvinyl alcohol and sodium polyacrylate, to improve dispersion stability.

4. The preparation process of highly dispersible ultrafine mica powder according to claim 3, characterized in that: The oven temperature in step S6 is set to 80-120° C. and the oven time is 4-6 hours.

5. The process for preparing highly dispersible ultrafine mica powder according to claim 4, characterized in that: The slag cleaning component (4) is provided with a driving component (6), the driving component (6) comprising a driving gear (61) sleeved with a driving shaft (42), the driving shaft (42) being movably sleeved with a connecting rod sleeve (62) on the outside, the top of the connecting rod sleeve (62) being rotatably connected with a driving ring gear (63), the grinding column (2) being provided with a fixing sleeve (64) on the outside, the inner wall of the fixing sleeve (64) being rotatably connected with a rotating drum (65), the inner wall of the rotating drum (65) being provided with a first spiral baffle (68), the grinding column (2) being slidably connected with a push piece (69), the driving ring gear (63) being meshed with the driving gear (61), the outer wall of the driving ring gear (63) being fixedly connected with a plurality of levers (66), and the inner wall of the rotating drum (65) being fixedly connected with a plurality of driving bars (67).

6. The process for preparing highly dispersible ultrafine mica powder according to claim 5, characterized in that: The self-cleaning component (5) further comprises a threaded sleeve (52), a threaded groove (53) is formed on the driving shaft (42), the driving shaft (42) and the threaded sleeve (52) are threadedly connected, a push rod (54) is fixedly connected to the outer wall of the threaded sleeve (52), and the push rod (54) is rotatably connected to the driving gear (61).

7. The process for preparing highly dispersible ultrafine mica powder according to claim 6, characterized in that: The slag cleaning component (4) is also provided with a reset component (7), the reset component (7) comprising a second spiral baffle (71), the second spiral baffle (71) having a winding direction opposite to that of the first spiral baffle (68), and the driving gear ring (63) is also provided with an incomplete gear ring (72).

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