CN115851001A - Synthetic mica powder, preparation method and application thereof in dry and wet dual-purpose powder cakes - Google Patents
Synthetic mica powder, preparation method and application thereof in dry and wet dual-purpose powder cakes Download PDFInfo
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- CN115851001A CN115851001A CN202211505980.1A CN202211505980A CN115851001A CN 115851001 A CN115851001 A CN 115851001A CN 202211505980 A CN202211505980 A CN 202211505980A CN 115851001 A CN115851001 A CN 115851001A
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- 239000000843 powder Substances 0.000 title claims abstract description 127
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
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- PNSDHQDPDMOPCP-UHFFFAOYSA-N dioctadecyl 2-hydroxybutanedioate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CC(O)C(=O)OCCCCCCCCCCCCCCCCCC PNSDHQDPDMOPCP-UHFFFAOYSA-N 0.000 claims 1
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 11
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Images
Abstract
The invention provides synthetic mica powder, a preparation method and application thereof in dry and wet dual-purpose pressed powder. The preparation method of the synthetic mica powder comprises the steps of firstly selecting 20-35 parts of fused magnesia, 30-45 parts of quartz powder, 15-30 parts of potassium fluosilicate, 5-20 parts of alumina powder and 1-5 parts of potassium carbonate as raw materials by mass, and rapidly melting all the raw materials at 1500-2000 ℃ generated by heating electrodes to obtain synthetic mica molten slurry; then cooling and crystallizing to obtain synthetic mica crystals, and crushing the synthetic mica crystal lump material to obtain synthetic mica sheets; after the treatments of dissociation, superfine grinding, wet grinding and the like are carried out on the synthetic mica sheet, a high-temperature flash drying system is used for carrying out drying dehydration and high-speed scattering treatment to form uniformly dispersed fine powder particles, and a qualified product is obtained. The synthetic mica powder has the characteristics of matt and easy compaction similar to talc, and is convenient for use by subsequently replacing talc.
Description
Technical Field
The invention relates to synthetic mica powder, a preparation method and application thereof in dry and wet dual-purpose pressed powder, belonging to the technical field of cosmetic raw materials.
Background
Talcum powder is used as filler, slipping agent and anticaking agent in cosmetics, and is commonly used in honey powder, talcum powder, powder cake, eye shadow, blush and face cream for increasing smooth touch of products. However, talc and asbestos belong to associated minerals with the potential risk of asbestos.
Asbestos, which is easily irritating to the lungs and is at risk of carcinogenesis (lung, skin, ovarian). Asbestos is reported to be an internationally recognized primary carcinogen. In order to guarantee the safety of consumers, the detection standards of cosmetics issued by regulatory departments of various countries clearly require that asbestos cannot be detected in talcum powder used for cosmetics.
The third party test reports provided by the talcum powder products used by cosmetic manufacturers are that no asbestos component is detected, and the third party test reports meet the relevant standard specification requirements of various countries, but the American 'strong body powder event' leads people to realize that: standard-compliant talc is still at greater risk of containing the carcinogen asbestos.
Talc-substituted raw materials such as corn starch, kaolin, etc. are difficult to apply universally in talc-free dusting formulations due to inherent drawbacks such as skin feel, heavy metals, etc.
The synthetic fluorophlogopite is an artificial synthetic crystal, hardly contains heavy metal, does not contain asbestos, is used as a high-quality cosmetic raw material, and is widely used in products such as honey powder, talcum powder, pressed powder, eye shadow, blush, cream and the like. However, the conventional synthetic mica on the market is not easily compacted in a powder formulation due to too high brightness, resulting in difficulty in replacing talc raw materials. The method is a good research and exploration direction for developing the matte easy-pressing powder for cosmetics to synthesize the mica powder by taking the synthetic fluorophlogopite as a raw material, wherein the matte easy-pressing powder can replace talc.
Disclosure of Invention
The invention aims to solve the technical problem of providing synthetic mica powder, a preparation method and application thereof in dry and wet dual-purpose pressed powder.
The above purpose is realized by the following technical scheme:
the invention firstly provides a preparation method of synthetic mica powder, which comprises the following steps:
(1) Selecting 20-35 parts of raw materials of fused magnesia, 30-45 parts of quartz powder, 15-30 parts of potassium fluosilicate, 5-20 parts of alumina powder and 1-5 parts of potassium carbonate according to mass fraction, and rapidly melting all the raw materials by utilizing the high temperature of 1500-2000 ℃ generated by a heating electrode to obtain synthetic mica molten liquid; then cooling and crystallizing to obtain synthetic mica crystals, and crushing the synthetic mica crystal lump material to obtain synthetic mica sheets;
(2) Screening a sheet with the particle size of 10-20 meshes from the mica sheets obtained in the step (1) to produce a substrate, mixing the screened substrate with pure water according to the mass ratio of 0.05-0.2;
(3) Carrying out filter pressing and dehydration on the coarse sheet slurry obtained in the step (2) to obtain a cake material, and then carrying out wet grinding to obtain a ground slurry;
(4) Adding pure water into the milled material obtained in the step (3) to prepare slurry with the solid content of 15-35%, and fully dispersing and washing at a high speed to remove the ultra-fine impurities attached to the surface of the mica sheet;
(5) Removing the synthetic mica powder slurry of coarse and fine particle diameter sections at two ends of the slurry washed in the step (4) through hydraulic sedimentation and classification, then naturally settling and concentrating for 5-10 days without adding chemical additives, draining and collecting a cake semi-finished product, wherein the average particle diameter of the cake semi-finished product is 8 +/-1 mu m;
(6) Preparing a cake material semi-finished product into slurry with the solid content of 25-45%, performing sand grinding by a wet sand mill to form mirror surface sand grinding on the surface of the mica sheet, reducing the loose density and mirror surface gloss effect of a synthetic mica powder product, changing the fluffy high light of the product into easily compacted matte soft coke, and further reducing the average particle size of the slurry to 6 +/-1 mu m;
(7) And (4) performing filter pressing and dehydration on the slurry subjected to the sand grinding treatment in the step (6), and performing drying dehydration and high-speed scattering treatment through a high-temperature flash drying system to form uniformly-dispersed fine powder particles so as to obtain a qualified product.
Further, the pressure of the high-pressure water flow in the step (2) is 8-15 MPa.
Further, the wet grinding in the step (3) controls the water content of the material to be 20-40%, the grinding time is 3.5-6 h, and the average particle size of the ground material is 12 +/-2 mu m.
Further, the hydraulic settling time in the step (5) is 1.5-4.5 h.
Further, the sanding time in the step (6) is 10-25 min, the slurry obtained in the step (6) contains 5-15% of particles with the particle size of less than 3 microns, 7-12% of particles with the particle size of more than 8 microns, 20-30% of the particle single-sheet diameter-thickness ratio of 20-50, 30-50% of the particle single-sheet diameter-thickness ratio of 50-80 and 30-40% of the particle single-sheet diameter-thickness ratio of 80-120.
Another object of the present invention is to provide a synthetic mica powder prepared by the above method.
Still another object of the present invention is to provide a dry-wet dual-purpose powder cake, which contains the above synthetic mica powder.
Further, the dry and wet dual-purpose pressed powder comprises the following components in parts by weight: 45-65 parts of synthetic mica powder, 5-15 parts of mica powder, 10-20 parts of silicon powder, 3-5 parts of vinyl polydimethylsiloxane/polymethylsiloxane silsesquioxane cross-linked polymer, 5-10 parts of magnesium stearate, 3-7 parts of titanium dioxide, 2-3 parts of ferric oxide, 2-4 parts of polydimethylsiloxane, 1-3 parts of isooctyl palmitate, 1-2.5 parts of diisostearyl malate, 1.5-2.5 parts of polybutene, 2-3 parts of synthetic squalane and 0.6-1 part of preservative.
The beneficial effects of the invention are:
the invention simulates the natural mineralization mechanism, preferably selects low-heavy metal raw materials to prepare artificially synthesized mica crystals, and prepares the superfine synthetic mica powder which is easy to compact and matte through the processes of crushing, precise screening, high-pressure water flow stripping superfine, wet flexible stripping superfine, hydraulic sedimentation grading and mirror surface sanding. Through the method, on one hand, the synthetic mica powder disclosed by the invention has the matte and easily-compacted characteristics similar to talc, so that the talc is conveniently replaced for use, and on the other hand, the synthetic mica powder disclosed by the invention can effectively avoid the potential risk of asbestos in the talc when being used for replacing the talc.
Drawings
FIG. 1 is a flow chart of the preparation of the synthetic mica powder of the present invention.
FIG. 2 is a particle size distribution diagram of the synthetic mica powder of the present invention.
FIG. 3 is an electron micrograph of the synthetic mica powder of the present invention.
FIG. 4 is a comparison of the oil absorption color of the synthetic mica powder of the present invention with talc powder, natural mica powder and ordinary synthetic mica powder.
FIG. 5 is a graph comparing compactibility of the synthetic mica powder of the present invention with talc powder, natural mica powder and ordinary synthetic mica powder.
FIG. 6 is a graph comparing the adhesion of the synthetic mica powder of the present invention with talc powder, natural mica powder and general synthetic mica powder.
Detailed Description
The present invention is described in detail below with reference to specific embodiments so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making the scope of the present invention more clearly defined.
The preparation method of the synthetic mica powder comprises the following steps:
(1) Selecting raw materials of 20-35 parts of fused magnesia, 30-45 parts of quartz powder, 15-30 parts of potassium fluosilicate, 5-20 parts of alumina powder and 1-5 parts of potassium carbonate according to mass fraction, and rapidly melting all the raw materials by utilizing the high temperature of 1500-2000 ℃ generated by a heating electrode to obtain synthetic mica molten slurry; then cooling and crystallizing to obtain synthetic mica crystals, and crushing the synthetic mica crystal lump material to obtain synthetic mica sheets;
(2) Screening a sheet with the particle size of 10-20 meshes from the mica sheets obtained in the step (1) to produce a substrate, mixing the screened substrate with pure water according to the mass ratio of 0.05-0.2;
(3) Carrying out filter pressing and dehydration on the coarse sheet slurry obtained in the step (2) to obtain a cake material, and then carrying out wet grinding to obtain a ground slurry; the wet grinding controls the water content of the material to be 20-40%, the grinding time is 3.5-6 h, and the average particle size of the ground material is 12 +/-2 mu m.
(4) Adding pure water into the milled material obtained in the step (3) to prepare slurry with the solid content of 15-35%, and fully dispersing and washing at a high speed to remove the ultra-fine impurities attached to the surface of the mica sheet;
(5) Removing the synthetic mica powder slurry of coarse and fine particle diameter sections at two ends of the slurry washed in the step (4) through hydraulic sedimentation and classification, then naturally settling and concentrating for 5-10 days without adding chemical additives, draining and collecting a cake semi-finished product, wherein the average particle diameter of the cake semi-finished product is 8 +/-1 mu m; the hydraulic settling time is 1.5-4.5 h.
(6) Preparing the cake material semi-finished product into slurry with the solid content of 25-45%, sanding the slurry by a wet method sand mill to form mirror surface sanding on the surface of the mica sheet, reducing the loose density and mirror surface gloss effect of the synthesized mica powder product, changing the fluffy high gloss of the product into the easily compacted matte soft coke, and further reducing the average particle size of the slurry to 6 +/-1 mu m; and (3) sanding for 10-25 min, wherein the slurry obtained in the step (6) contains 5-15% of particles with the particle size of less than 3 microns, 7-12% of particles with the particle size of more than 8 microns, 20-30% of the particle single-sheet aspect ratio, 30-50% of the particle single-sheet aspect ratio and 30-40% of the particle single-sheet aspect ratio, wherein the particle single-sheet aspect ratio is 20-50%, and 80-120%.
(7) And (4) performing filter pressing dehydration on the slurry subjected to the sand grinding treatment in the step (6), and performing drying dehydration and high-speed scattering treatment through a high-temperature flash drying system to form uniformly dispersed fine powder particles to obtain a qualified product.
Example 1:
(1) Selecting raw materials of 20 parts of fused magnesia, 45 parts of quartz powder, 15 parts of potassium fluosilicate, 20 parts of alumina powder and 1 part of potassium carbonate according to mass fraction, controlling the purity and heavy metal content of the raw materials, and rapidly melting all the raw materials by utilizing the high temperature of 1800 ℃ generated by a heating electrode to obtain the synthetic mica molten liquid. And accurately controlling the cooling speed of the molten slurry by utilizing a self-developed control program, realizing gradient cooling crystallization to obtain a synthetic mica crystal, and crushing the synthetic mica crystal lump material to obtain the synthetic mica sheet.
(2) The method comprises the steps of strictly optimizing a good-sheet and thin synthetic mica sheet with the number of 10-20 meshes by a vibration screening machine to be used as a production substrate, mixing the screened substrate with pure water according to the proportioning requirement of 0.1.
(3) And (3) carrying out filter pressing and dehydration on the coarse sheet slurry to obtain a cake material, putting the cake material into a steel type edge runner mill for wet milling to obtain superfine powder, controlling the water content of the material to be 30%, and carrying out milling for 4 hours to obtain milled slurry with the average particle size of 12 +/-2 microns.
(4) And adding pure water into the milled materials to prepare slurry with the solid content of 25%, fully dispersing and washing at a high speed, and removing the ultra-fine impurities attached to the surface of the mica sheet.
(5) The washed slurry has wide product particle size distribution, is naturally settled for 3 hours by waterpower, is classified, removes synthetic mica powder slurry with a certain proportion of coarse and fine particle diameter sections at two ends, is naturally settled and concentrated for 6 days without adding chemical additives, drains water and collects semi-finished cake materials, and the average particle size of the semi-finished products is 8 +/-1 mu m.
(6) The cake material semi-finished product is made into slurry with the solid content of 35 percent, the slurry is subjected to superfine grinding and mirror surface grinding effect on the surface of a mica sheet by a wet grinding machine, the sanding is carried out for 15min, the loose density and the mirror surface gloss effect of a synthetic mica powder product are reduced, the product is changed from fluffy high light into easily compacted matte soft coke, the average particle size of the slurry is further reduced to 6 +/-1 mu m, wherein the content of particles below 3 mu m is 12 percent, the content of particles above 8 mu m is 9 percent, the content of the particle single sheet diameter-thickness ratio is 20-50 percent, the content of the particle single sheet diameter-thickness ratio is 43 percent, and the content of the particle single sheet diameter-thickness ratio is 80-120 percent.
(7) And (3) performing filter pressing and dehydration on the slurry subjected to the sand grinding treatment to obtain a cake material semi-finished product, and performing drying dehydration and high-speed scattering treatment through a high-temperature flash evaporation drying system to form uniformly dispersed fine powder particles to obtain the product.
Example 2:
selecting raw materials of 35 parts of fused magnesia, 30 parts of quartz powder, 30 parts of potassium fluosilicate, 5 parts of alumina powder and 5 parts of potassium carbonate according to mass fraction, and rapidly melting all the raw materials by utilizing the high temperature of 1800 ℃ generated by a heating electrode to obtain the synthetic mica molten slurry. And accurately controlling the cooling speed of the molten slurry by utilizing a self-developed control program, realizing gradient cooling crystallization to obtain a synthetic mica crystal, and crushing the synthetic mica crystal lump material to obtain the synthetic mica sheet.
(2) The method comprises the steps of strictly optimizing a good-sheet and thin synthetic mica sheet with the number of 10-20 meshes by a vibration screening machine to be used as a production substrate, mixing the screened substrate with pure water according to the proportioning requirement of 0.1.
(3) And (3) carrying out filter pressing and dehydration on the coarse sheet slurry to obtain a cake material, putting the cake material into a steel type edge runner mill for wet milling to obtain superfine powder, controlling the water content of the material to be 30%, and carrying out milling for 4 hours to obtain milled slurry with the average particle size of 12 +/-2 microns.
(4) And adding pure water into the milled materials to prepare slurry with the solid content of 25%, fully dispersing and washing at a high speed, and removing the ultra-fine impurities attached to the surface of the mica sheet.
(5) The washed slurry has wide product particle size distribution, synthetic mica powder slurry with coarse and fine particle diameter sections at two ends is removed by hydraulic natural sedimentation for 2.5h and classification, then chemical additives are not added for natural sedimentation and concentration for 6d, the cake material semi-finished product is collected by draining, the average particle size of the semi-finished product is 6 +/-1 mu m, wherein the content of particles below 3 mu m is 9 percent, the content of particles above 8 mu m is 15 percent, the content of the particle single-piece diameter-thickness ratio is 19 percent, the content of the particle single-piece diameter-thickness ratio is 37 percent, and the content of the particle single-piece diameter-thickness ratio is 44 percent, wherein the particle single-piece diameter-thickness ratio is 20-50 percent.
(7) And (3) drying, dehydrating and scattering the cake material semi-finished product at a high speed by a high-temperature flash drying system to form uniformly dispersed fine powder particles to obtain the product.
Various performance tests
(1) And (3) testing the appearance of the scanning electron microscope: the synthetic mica powder prepared in example 1 was uniformly attached to a conductive adhesive, the conductive adhesive was attached to a sample base, gold was uniformly sprayed, the sample base was placed in a scanning electron microscope (HITACHI SU 8010), and an electron micrograph was taken to observe the morphology of particles.
(2) And (3) testing the particle size distribution: taking a proper amount of the synthetic mica powder prepared in the example 1, putting the synthetic mica powder into a 100mL beaker, adding 80mL of deionized water and 0.2 mass percent of 10% ammonium polyacrylate dispersant, stirring uniformly, and then putting the mixture into an ultrasonic cleaner for dispersing for 2min. Taking a proper amount (the light shading degree can be between 5 and 15 percent) of the dispersion slurry, adding the dispersion slurry into a sample pool of a laser particle analyzer (Euromeike LS-POP (6) particle analyzer), and testing in a standard mode.
(3) And (3) testing the glossiness: 3g of each of the synthetic mica powders prepared in example 1 and comparative example 1 was placed on white A4 paper, and the gloss was observed in a colorimetric lamp box under a D65 light source, with a 5-grade matte finish, 1-2-grade matte finish, and the 5-grade gloss was the highest.
(4) And (3) testing the diameter-thickness ratio: taking a proper amount of the synthetic mica powder prepared in the example 1 and the comparative example 1, measuring the constant-direction equal-division diameter of the particles by using a microscope (the magnification is more than 100 times), and taking the median value as the diameter of the synthetic mica powder of the particle size; the thickness of the synthesized mica powder was measured by a scanning electron microscope (Hitachi SU 8010), and the median value was taken as the thickness of the mica powder of the fraction. The diameter divided by the thickness is used as the ratio of the diameter to the thickness.
(5) Bulk density test: an appropriate amount of the synthetic mica powder prepared in example 1 and comparative example 1 was taken, and the powder was measured by using a bulk density tester (mesh size 80 mesh, stainless cup capacity 24.8 cm) 3 ) The bulk densities of the two sets of samples were tested.
The results of the above tests are shown in Table 1.
Table 1 table of results of conventional index test of examples and comparative examples
(6) Powder oil absorption color test: talcum powder, synthetic mica, natural mica and the synthetic mica powder of the invention with similar particle sizes are selected as comparison samples. Respectively weighing four kinds of powder with the same mass, placing the powder on a marble operating platform, slowly dripping oleic acid, and continuously kneading in the dripping process until a cake shape is just formed. And color changes of the four powders before and after oil absorption are observed in contrast under the sunlight condition. As a result, as shown in FIG. 4, the synthetic mica of the present invention was closest to talc in both matte and whiteness.
(7) And (3) compactness test: talcum powder, synthetic mica, natural mica and four kinds of powder of the synthetic mica are selected, and are evenly dispersed by 93 percent of powder and 7 percent of dimethyl silicone oil. After the cake was pressed with a cake mold under a pressure of 60 kg to prepare a cake, the cake was secondarily pressed under a pressure of 10 kg (using a circular eye shadow mold having a diameter of 5 CM), and the breakage of the cake after the secondary pressing was observed, and the result is shown in fig. 5. The synthetic mica of the present invention has the best compaction performance.
(8) Testing the adhesive force of the powder: four kinds of powder of talcum powder, synthetic mica and natural mica with similar particle sizes are selected for comparison test. Uniformly coating the four kinds of powder on the inner side of an arm in equal quantity, covering the black paper on the coating surface, pressing with the same force, taking out, and observing the quantity of the powder transferred on the black paper. The result is shown in fig. 6, and the transfer amount of the synthetic mica powder of the present invention is the least, which indicates the strongest adhesion.
Example 3;
the embodiment provides a dry-wet dual-purpose powder cake prepared from the synthetic mica powder, which comprises the following components, by weight, 45-65 parts of the synthetic mica powder, 5-15 parts of the mica powder, 10-20 parts of silicon powder, 3-5 parts of vinyl polydimethylsiloxane/polymethylsiloxane silsesquioxane cross-linked polymer, 5-10 parts of magnesium stearate, 3-7 parts of titanium dioxide, 2-3 parts of ferric oxide, 2-4 parts of polydimethylsiloxane, 1-3 parts of isooctyl palmitate, 1-2.5 parts of diisostearyl malate, 1.5-2.5 parts of polybutene, 2-3 parts of synthetic squalane and 0.6-1 part of a preservative.
(2) The invention relates to a preparation method of talcum-free dry and wet dual-purpose pressed powder, which mainly comprises the following steps:
(1) adding the synthetic mica powder, the silicon powder, the vinyl polydimethylsiloxane/polymethylsiloxane silsesquioxane cross-linked polymer, the magnesium stearate, the titanium dioxide and the iron oxide into a high-speed dispersion machine, closing a protective cover of the dispersion machine, and dispersing for 3 seconds under the condition of 15000 r/Min of the high-speed dispersion agent;
(2) opening a protecting cover of the dispersion machine, brushing the protecting cover and the corner powder into the high-speed dispersion machine by using a hairbrush, closing the protecting cover of the dispersion machine, dispersing for 3 seconds under the condition of 15000 r/Min, opening the protecting cover of the dispersion machine, and brushing the protecting cover and the corner powder into the high-speed dispersion machine by using the hairbrush;
(3) adding weighed polydimethylsiloxane, isooctyl palmitate, diisostearyl malate, polybutene and synthetic squalane into a beaker, heating in a water bath kettle at 80 deg.C, and mixing;
(4) dripping half of the oil phase mixed in the step (3) into the powder in the step (2) by a dropper, closing a protective cover of a dispersion machine, and dispersing for 6 seconds under the condition of 15000 r/Min of a high-speed dispersing agent;
(5) opening a protecting cover of the dispersion machine, brushing the protecting cover and the powder at the corners into the high-speed dispersion machine by using a hairbrush, dripping the other half of the oil phase mixed in the step (3) into the powder in the step (4) by using a dropper, closing the protecting cover of the dispersion machine, and dispersing for 6 seconds under the condition of 15000 r/Min of the high-speed dispersion agent;
(6) opening a protecting cover of the dispersion machine, brushing the protecting cover and the corner powder into the high-speed dispersion machine by using a brush, and adding the weighed preservative; closing a protective cover of the dispersion machine, and dispersing for 3 seconds under the condition of 15000 revolutions/Min of the high-speed dispersant;
(7) and (4) putting a proper amount of the powder in the step (6) into a pressed powder mould, prepressing for 2 seconds under the pressure of 60 kilograms, and pressurizing for 0.5 second for compression molding.
(3) According to the method for preparing the pressed powder of the invention in (2), the synthetic mica powder of the invention in the formula system is replaced by domestic talc TG-10 and imported talc 8HT with equal amount to prepare a comparative pressed powder sample, and the component proportions of the specific examples and the comparative examples are shown in Table 2.
TABLE 2 Dry and Wet pressed powder example and comparative example formula components table
(4) The cakes of the present example and comparative example were dropped in a free fall at a height of 1 m, the cakes were dropped twice, and the cakes were not broken and were regarded as passing the drop test, and the results of comparison of other performance tests are shown in table 3.
TABLE 3 comparative evaluation of powder pressing performance of formula system
The foregoing description has shown and described the principles, major features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof. The technical solutions disclosed in the present invention are not limited to the technical means disclosed in the above technical features, but also include technical solutions formed by equivalent substitutions of the above technical features. The present invention is not limited to the details given herein, but is within the ordinary knowledge of those skilled in the art.
Claims (8)
1. A preparation method of synthetic mica powder is characterized by comprising the following steps:
(1) Selecting 20-35 parts of raw materials of fused magnesia, 30-45 parts of quartz powder, 15-30 parts of potassium fluosilicate, 5-20 parts of alumina powder and 1-5 parts of potassium carbonate according to mass fraction, and rapidly melting all the raw materials at 1500-2000 ℃ generated by a heating electrode to obtain synthetic mica molten slurry; then cooling and crystallizing to obtain synthetic mica crystals, and crushing the synthetic mica crystal lump material to obtain synthetic mica sheets;
(2) Screening a sheet with the particle size of 10-20 meshes from the mica sheets obtained in the step (1) to obtain a production substrate, mixing the screened substrate with pure water according to the mass ratio of 0.05-0.2, mixing and homogenizing under the action of turbulence formed by high-pressure water flow, and dissociating and superfine-grinding the substrate by the high-pressure water flow to obtain a coarse sheet with the average particle size of 30 +/-6 mu m;
(3) Carrying out filter pressing and dehydration on the coarse sheet slurry obtained in the step (2) to obtain a cake material, and then carrying out wet grinding to obtain a ground slurry;
(4) Adding pure water into the milled material obtained in the step (3) to prepare slurry with the solid content and mass of 15-35%, and fully dispersing and washing at a high speed to remove the ultra-fine impurities attached to the surface of the mica sheet;
(5) Removing the synthetic mica powder slurry with coarse and fine particle diameter sections at two ends of the slurry washed in the step (4) through hydraulic sedimentation and classification, then naturally settling and concentrating for 5-10 d without adding a chemical additive, draining, and collecting a cake semi-finished product, wherein the average particle size of the cake semi-finished product is 8 +/-1 mu m;
(6) Preparing a cake material semi-finished product into slurry with the solid content of 25-45%, performing sand grinding through a wet sand mill to form mirror surface sand grinding on the surface of a mica sheet, reducing the loose density and mirror surface gloss effect of a synthetic mica powder product, changing fluffy high light into easily compacted matte soft coke, and further reducing the average particle size of the slurry to 6 +/-1 mu m;
(7) And (4) performing filter pressing dehydration on the slurry subjected to the sand grinding treatment in the step (6), and performing drying dehydration and high-speed scattering treatment through a high-temperature flash drying system to form uniformly dispersed fine powder particles to obtain a qualified product.
2. The method for preparing synthetic mica powder according to claim 1, wherein the pressure of the high-pressure water flow in the step (2) is 8 to 15MPa.
3. The preparation method of the synthetic mica powder according to claim 1, wherein the wet grinding in the step (3) controls the water content of the material to be 20% -40%, the grinding time is 3.5-6 h, and the average particle size of the ground material is 12 +/-2 μm.
4. The method for preparing synthetic mica powder according to claim 1, wherein the hydraulic settling time of step (5) is 1.5 to 4.5 hours.
5. The preparation method of the synthetic mica powder according to claim 1, characterized in that the sanding time in the step (6) is 10 to 25min, the content of particles below 3 μm in the slurry obtained in the step (6) is 5 to 15%, the content of particles above 8 μm is 7 to 12%, the content of the per-particle diameter-thickness ratio is 20 to 50% and is 20 to 30%, the content of the per-particle diameter-thickness ratio is 50 to 80% and is 30 to 40%.
6. A synthetic mica powder prepared by the above method.
7. A dry-wet dual-purpose pressed powder characterized in that the synthetic mica powder as claimed in claim 6 is contained in the dry-wet dual-purpose pressed powder.
8. The dry-wet dual-purpose pressed powder as claimed in claim 7, wherein the dry-wet dual-purpose pressed powder comprises the following components in parts by weight: 45 to 65 parts of synthetic mica powder, 5 to 15 parts of mica powder, 10 to 20 parts of silicon powder, 3 to 5 parts of vinyl polydimethylsiloxane/polymethylsiloxane silsesquioxane cross-linked polymer, 5 to 10 parts of magnesium stearate, 3 to 7 parts of titanium dioxide, 2 to 3 parts of iron oxide, 2 to 4 parts of polydimethylsiloxane, 1 to 3 parts of isooctyl palmitate, 1 to 2.5 parts of distearyl malate, 1.5 to 2.5 parts of polybutene, 2 to 3 parts of synthetic angle squalane and 0.6 to 1 part of preservative.
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