Modified mica powder as well as preparation method and application thereof

Abstract

The invention discloses modified mica powder as well as a preparation method and application thereof, and relates to the technical field of mica powder modification. The preparation method of the modified mica powder comprises the following steps: dissolving an initiator precursor, and adding a stabilizer for reaction to prepare an initiator; wherein the initiator precursor is selected from alkyl boron or alkyl zinc; the preparation method comprises the following steps: preparing mica powder into slurry, and adding a monomer and an initiator for reaction to prepare modified mica powder; the used initiator precursor can quickly generate free radicals at a relatively low reaction temperature so as to initiate a polymerization reaction, and after the stabilizer is added, a more stable initiator is prepared; the prepared initiator is used for modifying mica powder; the prepared material is favorable for improving the performance of the material, and is expected to be popularized and applied in the preparation of materials such as paint, plastics, coatings, printing ink, papermaking, rubber, chemical fibers, ceramics and the like. The process for preparing the modified mica powder is simple, and equipment is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of mica powder modification, and in particular, to a modified mica powder, a preparation method thereof, and an application thereof. Background Art

[0002] As an important inorganic chemical product, mica powder is widely used in many industrial fields such as coatings, inks, papermaking, plastics, rubbers, chemical fibers, and ceramics. Due to its unique layered structure and excellent physical and chemical properties, mica powder plays an irreplaceable role in these fields. However, most pigment surfaces carry a large number of hydroxyl groups, resulting in hydrophilic and oleophobic surfaces, and it is difficult to achieve good dispersibility in various oily systems.

[0003] To improve this problem, researchers at home and abroad have explored and applied a variety of surface treatment methods, mainly including organic surface modification, inorganic surface modification, mechanochemical modification, and composite modification, etc. Among them, the coupling agent modification method in organic modification has become the most widely used and fastest-developing method for mica powder in the fields of coatings, plastics, etc. due to its simple operation and remarkable effect. In recent years, researchers have also tried to graft polymer segments onto the powder surface to further improve its dispersion performance. However, whether it is coupling agent modification or graft modification, it is usually necessary to adjust a suitable pH environment, a relatively high reaction temperature, and a relatively long reaction time during the reaction process. This not only increases the complexity of the technology, but also causes greater loss to the equipment, and at the same time leads to waste of resources and energy.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a modified mica powder, a preparation method thereof, and an application thereof to solve the above technical problems.

[0006] The present invention is implemented as follows:

[0007] In a first aspect, an embodiment of the present invention provides a preparation method of a modified mica powder, including the following preparation steps:

[0008] After dissolving the initiator precursor, a stabilizer is added for reaction to obtain an initiator; wherein, the initiator precursor is selected from alkyl boride or alkyl zinc;

[0009] After making mica powder into a slurry, a monomer and an initiator are added for reaction to obtain a modified mica powder;

[0010] By mass percentage, the mass of the stabilizer is 100%-700% of the mass of the initiator precursor; the mass of the monomer is 0.1%-80% of the mass of the mica powder; the mass of the initiator is 0.1%-10% of the mass of the monomer.

[0011] Second aspect, an embodiment of the present invention provides a modified mica powder prepared by the preparation method as described above.

[0012] Third aspect, an embodiment of the present invention provides an application of a modified mica powder prepared by the preparation method as described above in the preparation of the following materials, wherein the materials are selected from at least one of paint, plastic, coating, ink, papermaking, rubber, chemical fiber, and ceramics.

[0013] The present invention has the following beneficial effects:

[0014] In the preparation method of the modified mica powder provided by the embodiment of the present invention, the initiator precursor used can rapidly generate free radicals at a relatively low reaction temperature and then initiate a polymerization reaction. After adding a stabilizer, a more stable initiator is prepared; the prepared initiator is used for modifying mica powder; the prepared modified mica powder has better adaptability in different dispersants and is expected to be widely used in the preparation of materials such as paint, plastic, coating, ink, papermaking, rubber, chemical fiber, and ceramics. The preparation process of the modified mica powder provided by the present invention is simple and the equipment is simple, which is conducive to popularization and application. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a SEM test diagram of unmodified mica powder;

[0017] Figure 2 It is a SEM test diagram of the modified mica powder prepared in Example 1. Detailed Embodiments

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Those not specified in the embodiments are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments not specified by the manufacturer are all conventional products that can be obtained through commercial purchase.

[0019] Alkyl boron and alkyl zinc have received increasing attention in recent years because they can rapidly generate free radicals at a relatively low reaction temperature and then initiate a polymerization reaction. However, due to the very active nature of diethyl zinc, there are certain limitations in direct use.

[0020] After the inventors introduced a stabilizer, a stable initiator was prepared; and the modified initiator was used for the surface graft polymerization of mica powder, effectively solving the technical problems such as high reaction temperature, adjusting the pH environment, long reaction time, and large equipment loss during the reaction process. The specific implementation process is as follows:

[0021] In a first aspect, an embodiment of the present invention provides a method for preparing modified mica powder, including the following preparation steps:

[0022] After dissolving the initiator precursor, a stabilizer is added for reaction to obtain an initiator; wherein, the initiator precursor is selected from alkyl boron or alkyl zinc;

[0023] After making the mica powder into a slurry, a monomer and an initiator are added for reaction to obtain modified mica powder;

[0024] By mass percentage, the mass of the stabilizer is 100%-700% of the mass of the initiator precursor; the mass of the monomer is 0.1%-80% of the mass of the mica powder; the mass of the initiator is 0.1%-10% of the mass of the monomer.

[0025] It should be noted that in the method for preparing modified mica powder, the initiator precursor used can rapidly generate free radicals at a relatively low reaction temperature to initiate a polymerization reaction. After adding a stabilizer, a more stable initiator is prepared; the prepared initiator is used for the modification of mica powder. By adjusting the reaction conditions, the chain segment length of the graft polymer can be adjusted, so that the mica powder has better adaptability in different dispersants.

[0026] Alkyl boron and alkyl zinc play important roles in free radical polymerization and coordination polymerization respectively due to their low temperature activity, controllability and environmental adaptability, and are particularly suitable for the synthesis of high-performance, functional and green polymer materials.

[0027] Among them, alkyl boron as an initiator has the characteristics of efficiently initiating free radical polymerization at 0°C or even lower temperatures; forming a complex with oxygen and still being able to initiate polymerization in the presence of a small amount of oxygen; by adjusting the ratio of the boron reagent to the monomer, the molecular weight can be precisely controlled.

[0028] Alkyl zinc realizes living polymerization in the presence of a ligand, and the molecular weight increases linearly; functional groups such as hydroxyl and carboxyl are introduced through the terminal zinc bond; compared with traditional organolithium / magnesium reagents, alkyl zinc has lower toxicity and is suitable for the synthesis of biodegradable materials.

[0029] In a preferred embodiment of the application of the present invention, the initiator precursor used is alkyl zinc.

[0030] Since alkyl zinc has strong activity, its direct use as an initiator has certain limitations, so a stabilizer is introduced to modify it.

[0031] In an alternative embodiment of the present invention, the stabilizer is selected from at least one of triethylenediamine, N,N,N',N'-tetramethyl-1,2-ethanediamine, and hexamethylenetetramine.

[0032] It should be noted that the stabilizer of the initiator precursor material can improve the stability of the product.

[0033] In an alternative embodiment of the present invention, the stabilizer includes triethylenediamine, which has the following characteristics: it can capture trace free radicals in the system (such as oxygen and reactive species generated by peroxide decomposition), prevent the premature decomposition of the initiator during storage or pre-reaction, and ensure the controllability of the polymerization reaction; by neutralizing free radical by-products, it slows down the consumption of the initiator and improves the storage stability; it can maintain activity under both low temperature (such as room temperature curing) and high temperature (such as PU foaming) conditions, with strong adaptability; it is compatible with a variety of monomers (acrylate, epoxy resin, isocyanate, etc.), initiators (peroxide, azo type), and metal catalysts (such as palladium, copper), and can be flexibly used in composite systems; in addition, triethylenediamine has low toxicity and meets environmental protection requirements.

[0034] In an alternative embodiment of the present invention, by mass percentage, when preparing the initiator, the mass of the stabilizer is 200%-500% of the mass of the initiator precursor. It can select any one of 200%, 250%, 300%, 400%, 405%, 486%, and 500% according to actual needs, or other values within the range of 200%-500%.

[0035] In an alternative embodiment of the present invention, by volume percentage, the volume ratio of the initiator precursor to the reagent used to dissolve the initiator precursor is 1%-100%. It can select any one of 1%, 10%, 30%, 50%, 80%, 90%, and 100% according to actual needs, or other values within the range of 1%-100%.

[0036] In an alternative embodiment of the present invention, the reagent for dissolving the initiator precursor is selected from any one of aliphatic hydrocarbons, alcohols, aromatic hydrocarbons, and ethers.

[0037] It should be noted that the purpose of the reagent is to fully dissolve the initiator precursor to facilitate its reaction with the stabilizer; the reagent used in the present invention is an aliphatic hydrocarbon; further, it is hexane. In other embodiments of the present invention, the type of the reagent can be reasonably adjusted according to actual needs.

[0038] In an alternative embodiment of the present invention, the initiator is prepared in a non-oxidizing atmosphere, and the specific atmosphere can be selected as argon, helium, nitrogen, etc. according to the situation.

[0039] It should be noted that a non-oxidizing environment is conducive to protecting the reactants from reacting with oxygen or deteriorating during the reaction, ensuring the smooth progress of the reaction; in addition, it can also inhibit the occurrence of some side reactions and avoid the decline in the purity and yield of the products; exclude the influence of other interfering gases on the reaction, and make the experimental results more accurate and reliable.

[0040] In an optional embodiment of the present invention, after adding the stabilizer and reacting for 10 min - 24 h, the initiator solution system is filtered and vacuum dried to obtain the initiator.

[0041] It should be noted that the specific reaction time can be reasonably adjusted according to the actual amount of raw materials to be processed, so that the reaction is more complete and a uniform product is obtained.

[0042] In the embodiment of the present invention, the specific methods for filtering and vacuum drying the initiator solution system are not particularly limited and can be reasonably selected according to the actual situation.

[0043] In an optional embodiment of the present invention, when preparing the modified mica powder, the monomer mass is 0.1% - 40% of the mica powder mass; further, the monomer mass is 0.1% - 20% of the mica powder mass; any one of 0.1%, 1%, 4.7%, 9.1%, 10%, 13.4%, 15%, 18% and 20% can be selected according to actual needs, or other values within the range of 0.1% - 20% can also be selected.

[0044] In an optional embodiment of the present invention, the monomer is selected from at least one of methyl methacrylate monomer, styrene, butyl acrylate, methacrylic acid and acrylamide.

[0045] It should be noted that the type and proportion of the monomer directly affect the performance of the polymer, such as heat resistance, aging resistance and chemical stability; the monomer participates in the formation of the polymer chain in the polymerization reaction, and the number and type of the functional groups of the monomer will affect the molecular weight and structure of the polymer; by selecting the appropriate monomer and adjusting its proportion, the processing performance and application performance of the polymer can be improved, such as changing the proportion of the comonomer will change the properties such as the hardness, water resistance and heat resistance of the copolymer.

[0046] In an optional embodiment of the present invention, the monomer includes methyl methacrylate monomer. In other embodiments, the type of the monomer can be reasonably selected according to actual needs.

[0047] In an optional embodiment of the present invention, after adding the monomer and the initiator and reacting for 1 h - 24 h, the modified mica powder solution system is filtered, washed and dried to obtain the modified mica powder.

[0048] In an alternative embodiment of the present invention, the mass of the initiator is 0.1%-10% of the mass of the monomer. Further, the mass of the initiator is 0.1%-5% of the mass of the monomer; any one of 0.1%, 0.3%, 0.32%, 0.66%, 1%, 1.1%, 1.5%, 3%, 3.5%, 4% and 5% can be selected according to actual needs, or other values within the range of 0.1%-5% can also be selected.

[0049] It should be noted that the specific reaction time after adding the monomer and the initiator can be reasonably adjusted according to the actual amount of raw materials to be processed, so that the reaction is more complete and a homogeneous product is obtained.

[0050] In the embodiments of the present invention, the specific methods of filtering, washing, and drying the modified mica powder solution system are not particularly limited and can be reasonably selected according to the actual situation.

[0051] In addition, it should be noted that in order to make the reaction more complete, in the embodiments of the present invention, the reaction system is stirred during the preparation of the initiator and the modified mica powder. The rotation speed and time of stirring are reasonably adjusted according to the actual amount of materials to be processed.

[0052] Among them, the modified mica powder solution system is filtered by suction filtration, and the filter cake is washed 3-5 times repeatedly. Then, drying treatment is carried out at 50°C-100°C, or vacuum drying treatment is selected. In other embodiments of the present invention, the methods of filtration treatment and drying treatment can be reasonably selected according to the actual situation.

[0053] In summary, the preparation method of the modified mica powder provided by the embodiments of the present invention specifically includes the following steps:

[0054] (1) Prepare the initiator

[0055] In a non-oxidizing atmosphere, the initiator precursor and the reagent for dissolving the initiator precursor are mixed in proportion to obtain a first solution for standby; among them, the volume ratio of the initiator precursor to the reagent used for dissolving the initiator precursor is 1%-100%.

[0056] Stabilizer is added to the first solution in proportion for reaction. After reacting for 10 min-24 h, filtration and vacuum drying are carried out to obtain the initiator; among them, the mass of the stabilizer is 200%-500% of the mass of the initiator precursor.

[0057] The above reaction is carried out at room temperature.

[0058] (2) Prepare the modified mica powder

[0059] The mica powder is formulated into a slurry in proportion. After stirring evenly and removing oxygen, it is reserved for use.

[0060] Monomers are added to the slurry after deoxygenation treatment for reaction. After stirring to form a uniform emulsion, it is reserved for use; among them, the mass of the monomers is 0.1%-20% of the mass of the mica powder.

[0061] The initiator prepared in (1) is added to the above emulsion for reaction. After reacting for 1 h - 24 h, the modified mica powder solution system is filtered, washed, and dried to obtain the modified mica powder; among them, the mass of the initiator is 0.1%-5% of the mass of the monomers.

[0062] It should be noted that the solvent used for formulating the slurry is an organic solvent. Toluene is used in the embodiments of the present invention, and other solvents can be selected according to actual needs in other embodiments.

[0063] In a second aspect, an embodiment of the present invention provides a modified mica powder prepared by the preparation method as described above.

[0064] In a third aspect, an embodiment of the present invention provides an application of the modified mica powder prepared by the preparation method as described above in the preparation of the following materials, where the materials are selected from at least one of paint, plastic, coating, ink, papermaking, rubber, chemical fiber, and ceramic.

[0065] The features and properties of the present invention will be further described in detail below in conjunction with embodiments.

[0066] Example 1

[0067] This example provides a modified mica powder, and its preparation method includes the following steps:

[0068] (1) Preparation of the initiator

[0069] 500 mL of hexane is used as a reagent for dissolving the initiator precursor, and 150 g of triethylenediamine is used as a stabilizer. They are added to a three-necked flask with magnetic stirring for reaction to obtain a first solution;

[0070] Under the protection of a nitrogen atmosphere and stirring at a speed of 400 rpm, 30 mL of the initiator precursor diethylzinc is added to the first solution, and the reaction is carried out at room temperature for 5 h. After the reaction is completed, filtration is carried out, and after vacuum drying for 5 h, the initiator is obtained and reserved for use.

[0071] By mass percentage, the mass of the stabilizer is 405% of the mass of the initiator precursor.

[0072] (2) Preparation of the modified mica powder

[0073] Add 50 g of mica powder and 250 mL of toluene to the reaction kettle in sequence to prepare a slurry. After stirring evenly and removing oxygen, add 2.5 mL of monomer methyl methacrylate for reaction;

[0074] Under nitrogen protection, add 25 mg of the initiator prepared in step (1), and react at room temperature for 1 h. After the reaction is completed, filter the modified mica powder solution system, wash it thoroughly, and obtain the modified mica powder after vacuum drying.

[0075] By mass percentage, the mass of the monomer is 4.7% of the mass of the mica powder; the mass of the initiator is 1.1% of the mass of the monomer.

[0076] Example 2

[0077] This example provides a modified mica powder, and its preparation method includes the following steps:

[0078] (1) Prepare the initiator

[0079] Take 300 mL of toluene as the reagent for dissolving the initiator precursor, and 120 g of triethylenediamine as the stabilizer, add them to a three-necked flask with magnetic stirring for reaction to obtain the first solution;

[0080] Under nitrogen atmosphere protection, with stirring at a speed of 400 rpm, add 20 mL of the initiator precursor diethylzinc to the first solution, and react at room temperature for 5 h. After the reaction is completed, filter, and obtain the initiator after vacuum drying for 5 h, and reserve it for use.

[0081] By mass percentage, the mass of the stabilizer is 486% of the mass of the initiator precursor.

[0082] (2) Prepare the modified mica powder

[0083] Add 100 g of mica powder and 400 mL of toluene to the reaction kettle in sequence to prepare a slurry. After stirring evenly and removing oxygen, add 5 mL of monomer methyl methacrylate for reaction;

[0084] Under nitrogen protection, add 15 mg of the initiator prepared in step (1), and react at room temperature for 2 h. After the reaction is completed, filter the modified mica powder solution system, wash it thoroughly, and obtain the modified mica powder after vacuum drying.

[0085] By mass percentage, the mass of the monomer is 4.7% of the mass of the mica powder; the mass of the initiator is 0.32% of the mass of the monomer.

[0086] Example 3

[0087] This example provides a modified mica powder, and its preparation method includes the following steps:

[0088] (1) Prepare the initiator

[0089] Take 500 mL of hexane as the reagent for dissolving the initiator precursor, and 150 g of triethylenediamine as the stabilizer, add them to a three-necked flask equipped with magnetic stirring for reaction to obtain the first solution;

[0090] Under the protection of a nitrogen atmosphere and stirring at a speed of 400 rpm, add 30 mL of the initiator precursor diethylzinc to the first solution and react at room temperature for 5 h. After the reaction is completed, filter, and after vacuum drying for 5 h, obtain the initiator for standby.

[0091] By mass percentage, the mass of the stabilizer is 400% of the mass of the initiator precursor.

[0092] (2) Preparation of modified mica powder

[0093] Add 50 g of mica powder and 250 mL of toluene to the reaction kettle in sequence to prepare a slurry. After stirring evenly and removing oxygen, add 5 mL of the monomer styrene for reaction;

[0094] Under the protection of nitrogen, add 30 mg of the initiator prepared in step (1), and react at room temperature for 1 h. After the reaction is completed, filter the modified mica powder solution system, wash it thoroughly, and obtain the modified mica powder after vacuum drying.

[0095] By mass percentage, the mass of the monomer is 9.1% of the mass of the mica powder; the mass of the initiator is 0.66% of the mass of the monomer.

[0096] Example 4

[0097] This example provides a modified mica powder, and its preparation method includes the following steps:

[0098] (1) Preparation of initiator

[0099] Take 300 mL of hexane as the reagent for dissolving the initiator precursor, and 120 g of triethylenediamine as the stabilizer, add them to a three-necked flask equipped with magnetic stirring for reaction to obtain the first solution;

[0100] Under the protection of a nitrogen atmosphere and stirring at a speed of 400 rpm, add 20 mL of the initiator precursor diethylzinc to the first solution and react at room temperature for 5 h. After the reaction is completed, filter, and after vacuum drying for 5 h, obtain the initiator for standby.

[0101] By mass percentage, the mass of the stabilizer is 486% of the mass of the initiator precursor.

[0102] (2) Preparation of modified mica powder

[0103] Add 100 g of mica powder and 400 mL of toluene to the reaction kettle in sequence to prepare a slurry. After stirring evenly and removing oxygen, add 15 mL of the monomer butyl acrylate for reaction;

[0104] Under nitrogen protection, 40 mg of the initiator prepared in step (1) was added, and the reaction was carried out at room temperature for 2 h. After the reaction, the modified mica powder solution system was filtered, washed thoroughly, and dried under vacuum to obtain the modified mica powder.

[0105] By mass percentage, the mass of the monomer is 13.4% of the mass of the mica powder; the mass of the initiator is 0.3% of the mass of the monomer.

[0106] Comparative Example 1

[0107] This comparative example provides a modified mica powder, which is prepared by the existing technology, and specifically includes the following steps:

[0108] 1 kg of mica powder was added to a high-speed stirring pot, preheated to 80 °C, and after adjusting the rotation speed to 800 r / min, 10 g of silane coupling agent KH550 was added for reaction. The reaction was continuously stirred during the process, and after 2 h of reaction, the product was discharged.

[0109] After drying the product at 105 °C for 2 h, the modified mica powder was obtained and collected for standby.

[0110] Test Example 1

[0111] In this test example, the modified mica powder prepared in Example 1 and Comparative Example 1, as well as the mica powder raw material (untreated), were respectively used for filling high-density polyethylene (HDPE) plastics, and the tensile strength was tested. The specific test method is as follows:

[0112] The addition amount of the modified mica powder was 10%. After premixing, it was granulated with a twin-screw extruder. The extrusion temperature was set at 170 °C, the screw speed was 55 r / min, and then test specimens were made by an injection molding machine. The relevant test results are shown in Table 1.

[0113] Table 1 Tensile strength data

[0114] Sample Tensile strength (MPa) Ungraded mica powder 12 Example 1 18 Example 2 16 Example 3 15 Example 4 16 Comparative Example 1 14

[0115] As can be seen from the data in Table 1, the modified mica powder provided in the examples of the present invention can effectively improve the tensile strength of HDPE plastics. Among them, the tensile strength of Example 1 was increased by 50% compared with the unmodified mica powder, and was increased by 28.6% compared with the modified mica powder prepared by the existing modification method of Comparative Example 1, achieving remarkable results. The tensile strength of the modified mica powder changes with the change of the amount of stabilizer, monomer or initiator. Among them, the tensile strength is greatly affected by the amount of stabilizer.

[0116] Test Example 2

[0117] In this test example, SEM tests were carried out on the modified mica powder prepared in Example 1 and the unmodified mica powder. The relevant test results are shown in Figure 1(Ungraded mica powder), Figure 2 (Modified mica powder of Example 1).

[0118] Combined with Figure 1 and Figure 2 As can be seen from the results, the surface of the unmodified mica powder is smooth and flat, and a polymer layer is evenly coated on the surface of the mica after treatment.

[0119] In summary, in the preparation method of the modified mica powder provided by the embodiments of the present invention, the initiator precursor used can rapidly generate free radicals at a relatively low reaction temperature and then initiate a polymerization reaction. After adding a stabilizer, a more stable initiator is prepared; the prepared initiator is used for modifying mica powder; when the modified mica powder is used to make plastics, the tensile strength of the plastics is improved, and this product is expected to be popularized and applied in the preparation of materials such as paints, plastics, coatings, inks, papermaking, rubbers, chemical fibers, and ceramics.

[0120] The preparation process of the modified mica powder in the present invention is simple and the equipment is simple, which is conducive to popularization and application. By adjusting the reaction conditions to adjust the chain segment length of the grafted polymer, the mica powder has better adaptability in different dispersants.

[0121] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A preparation method of modified mica powder, characterized in that, It includes the following preparation steps: After dissolving the initiator precursor, a stabilizer is added for reaction to obtain an initiator; wherein, the initiator precursor is selected from alkyl borane or alkyl zinc; After making mica powder into a slurry, a monomer and an initiator are added for reaction to obtain modified mica powder; By mass percentage, the mass of the stabilizer is 100%-700% of the mass of the initiator precursor; the mass of the monomer is 0.1%-80% of the mass of the mica powder; the mass of the initiator is 0.1%-10% of the mass of the monomer.

2. The preparation method according to claim 1, characterized in that, By mass percentage, when preparing the initiator, the mass of the stabilizer is 200%-600% of the mass of the initiator precursor; Preferably, when preparing the modified mica powder, the mass of the monomer is 0.1%-40% of the mass of the mica powder.

3. The preparation method according to claim 1, characterized in that, The stabilizer is selected from at least one of triethylenediamine, N,N,N',N'-tetramethyl-1,2-ethylenediamine and hexamethylenetetramine; Preferably, the stabilizer includes triethylenediamine.

4. The preparation method according to claim 1, wherein By volume percentage, the volume ratio of the initiator precursor to the reagent used to dissolve the initiator precursor is 1%-100%.

5. The preparation method according to claim 1, characterized in that, The reagent for dissolving the initiator precursor is selected from any one of aliphatic hydrocarbons, alcohols, aromatic hydrocarbons, toluene and ethers; Preferably, the reagent for dissolving the initiator precursor is an aliphatic hydrocarbon; preferably hexane.

6. The preparation method according to claim 1, characterized in that, The monomer is selected from at least one of methyl methacrylate monomer, styrene, butyl acrylate, methacrylic acid and acrylamide; Preferably, the monomer includes methyl methacrylate monomer.

7. The preparation method according to claim 1, characterized in that, The initiator is prepared in a non-oxidizing atmosphere; Preferably, after adding the stabilizer and reacting for 10 min - 24 h, the initiator solution system is filtered and vacuum dried to obtain the initiator.

8. The preparation method according to claim 1, characterized in that, The preparation method further includes: After adding the monomer and the initiator and reacting for 1 h - 24 h, the modified mica powder solution system is filtered, washed and dried to obtain the modified mica powder.

9. Modified mica powder prepared by the preparation method according to any one of claims 1-8.

10. Use of the modified mica powder prepared by the preparation method according to any one of claims 1-8 in the preparation of the following materials, characterized in that, The material is selected from at least one of paint, plastic, coating, ink, paper making, rubber, chemical fiber and ceramic.

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