Preparation method of high-performance modified material based on talcum powder

Abstract

The invention relates to the technical field of filler modification, and discloses a preparation method of a high-performance modified material based on talcum powder, which comprises the following steps: S1, pretreating talcum powder and a surface modifier, performing particle size screening on the talcum powder, and mixing the talcum powder with inorganic and organic modifiers; s2, supercritical fluid modification treatment: putting the mixed talcum powder and a surface modifier in a supercritical fluid reaction environment for treatment, so that the modifier is uniformly attached to the surface of the talcum powder; s3, adding dual surface modifiers, namely synchronously introducing inorganic and organic modifiers into a supercritical fluid environment to form a dual modified layer; and S4, cooling and dispersing, and gradually reducing the temperature and pressure of the reaction environment. By optimizing the formula of the surface modifier and accurately controlling the reaction temperature, the dispersity of the talcum powder, the compatibility with a matrix and the thermal stability are improved, so that the mechanical property and the high-temperature resistance of the composite material are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of filler modification, and specifically to a preparation method of high-performance modified materials based on talcum powder. Background Art

[0002] In modern industry and daily life, talcum powder is widely used in many fields such as plastics, rubber, coatings, and cosmetics. As an important filler, it can improve the physical properties of materials, enhance the compressive resistance, heat resistance, and anti-aging properties of materials. However, the dispersion and surface modification of talcum powder have always been a difficult problem. Traditional talcum powder modification methods often cannot exert their maximum efficiency in practical applications, especially in the performance of polymer composites. In order to improve the performance of talcum powder, improve its dispersion in materials and compatibility with the matrix, there is an urgent need for a more efficient and stable modification technology.

[0003] In the prior art, the application of talcum powder mainly relies on traditional physical addition methods or simple surface modification. These methods add talcum powder to the matrix material by physical means, or use conventional chemical modifiers to treat the surface of talcum powder to improve its performance. These methods can improve the dispersion and mechanical properties of talcum powder to a certain extent. Some also use a single modifier to adjust the surface properties of talcum powder, improve its binding force with the polymer matrix, and improve the anti-aging and heat resistance of the material to a certain extent. These technical solutions have improved the performance of talcum powder to a certain extent.

[0004] However, there are still some deficiencies in the prior art; firstly, traditional talcum powder modification methods often cannot effectively avoid the agglomeration of talcum powder particles, resulting in poor dispersion, which in turn affects the mechanical properties of the composite material. The selection range of existing surface modifiers is limited, and the best modification effect is often not achieved during use, resulting in uneven dispersion of talcum powder in the material and the mechanical properties not reaching the expected level; secondly, the temperature control of the modification process in the prior art is not accurate, and the temperature fluctuates greatly, resulting in incomplete or uneven modification reactions, affecting the binding effect between the modifier and talcum powder; more importantly, the prior art fails to fully consider the stability of talcum powder in high-temperature environments, resulting in poor thermal stability of the material and difficulty in meeting long-term use requirements. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a preparation method of high-performance modified materials based on talcum powder, which solves the problems of poor dispersion of talcum powder, insufficient surface modification, and insufficient thermal stability in the prior art.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A preparation method of high-performance modified materials based on talcum powder, comprising the following steps: S1. Pretreatment of talcum powder and surface modifier: Screen the particle size of talcum powder and mix it with inorganic and organic modifiers. The purpose of particle size screening is to ensure the uniform particle size of talcum powder, enhance the adhesion and dispersibility of the modifier. If the particle size is too large, it may cause the modifier to fail to adhere evenly, while if the particle size is too small, it may lead to excessive agglomeration. By mixing, ensure the uniform distribution of the modifier on the surface of talcum powder, so as to achieve the ideal surface modification effect; S2. Supercritical fluid modification treatment: Place the mixed talcum powder and surface modifier in a supercritical fluid reaction environment for treatment, so that the modifier adheres evenly to the surface of talcum powder. Supercritical carbon dioxide, in the supercritical state, exhibits the solubility of a liquid and the permeability of a gas. Through this property, supercritical carbon dioxide can penetrate into the surface of talcum powder particles and make the modifier adhere more evenly to the surface of talcum powder. Due to the strong solubility of supercritical carbon dioxide, it can effectively dissolve inorganic and organic modifiers, enabling them to fully react with talcum powder during the reaction, achieving a better surface modification effect; S3. Addition of dual surface modifiers: Synchronously introduce inorganic and organic modifiers in the supercritical fluid environment to form a dual modification layer. In the supercritical fluid environment, the simultaneous introduction of inorganic and organic modifiers can achieve the superimposed effect of different types of modification layers on the surface of talcum powder. Inorganic modifiers usually provide strong chemical binding forces, enhancing the compatibility between talcum powder and matrix materials; organic modifiers mainly improve the surface hydrophobicity of talcum powder or increase the affinity with organic substrates. The synergistic effect of the two modifiers can enhance the comprehensive properties of talcum powder, such as improving the mechanical properties, thermal stability, and chemical corrosion resistance of the material; S4. Cooling and dispersion: Gradually reduce the temperature and pressure of the reaction environment and ensure the uniform dispersion of modified talcum powder through mechanical dispersion means. Through the cooling and pressure reduction process, the supercritical fluid in the reaction environment turns into gaseous carbon dioxide, thereby reducing the solubility of the fluid, promoting the precipitation of the modifier, and reducing the influence of unreacted modifier on talcum powder. Mechanical dispersion ensures the uniform dispersion of talcum powder particles, avoids agglomeration between particles, and ensures the uniformity and stability of the material; S5. Performance testing: Test the crystal structure, particle size distribution, and mechanical properties of modified talcum powder to ensure that the modification effect meets the expected requirements.

[0007] Preferably, the pretreatment of the talcum powder and the surface modifier includes: Select talcum powder with a particle size of 1 - 15 μm and 90 - 110 parts. The particle size range of talcum powder is 1 - 15 μm. This particle size range has a moderate specific surface area, which will neither be too fine to cause agglomeration nor too coarse to affect the adhesion effect of the modifier; Select 0.5 - 3 parts of an inorganic surface modifier, which is a titanate. Titanate-based inorganic surface modifiers usually have strong chemical activity and can chemically react with the surface of talc powder to form stable chemical bonds. The addition of titanate can effectively enhance the compatibility between talc powder and matrix materials (such as polymers, etc.). Especially in the application of composite materials, it helps to improve the mechanical properties, thermal stability, and corrosion resistance of the materials; Select 2 - 8 parts of an organic surface modifier, which is an epoxy compound. The addition of epoxy compounds (such as epoxy resins) is mainly to improve the surface lipophilicity of talc powder, so that it shows better compatibility in the combination with organic matrix materials. The epoxy groups of epoxy resins can react with the hydroxyl groups or other functional groups on the surface of talc powder to form a cross-linked structure, thereby enhancing the interfacial bonding force between talc powder and polymers; Use mechanical stirring, control the rotation speed at 300 - 800 rpm, the stirring time at 30 - 90 minutes, and the stirring temperature at 25 - 60 °C. Mix the talc powder and the surface modifier under normal pressure environment. The purpose of mechanical stirring is to ensure the uniform mixing of talc powder and the surface modifier. Controlling the rotation speed between 300 - 800 rpm can ensure the sufficiency of stirring, avoid excessive heat generation at too high a rotation speed, causing the volatilization or degradation of the modifier. Controlling the stirring temperature within the range of 25 - 60 °C helps to increase the reaction rate, promote the combination of the modifier and the surface of talc powder, and at the same time avoid the decomposition of the organic modifier at too high a temperature. Too short a time may result in uneven mixing, and too long a time may lead to waste of energy. Therefore, the time within this range ensures the sufficient adsorption of the modifier.

[0008] Preferably, the preparation of the titanate modifier includes: Take 5 - 15 parts of tetrabutyl titanate and add 85 - 95 parts of anhydrous ethanol solution with a concentration controlled at 5 - 15%. Tetrabutyl titanate is the precursor of the titanate modifier, and its molecule contains four ethoxy (-OEt) groups, which are prone to hydrolysis reactions in the anhydrous ethanol solution. When tetrabutyl titanate is dissolved in anhydrous ethanol, the ethoxy groups hydrolyze to form titanium-oxygen (Ti - O) bonds and ethanol molecules; Under the conditions of a stirring rate of 300 - 800 rpm, a stirring time of 30 minutes - 2 hours, and a temperature of 50 - 80 °C, while stirring to promote the formation of titanate, slowly drop 1 - 5 parts of deionized water to form a titanate modifier solution. When the stirring rate is 300 - 800 rpm, it can ensure that the reactants are fully in contact in the solution and prevent the reaction effect from being affected by precipitation or agglomeration. Controlling the temperature between 50 - 80 °C provides sufficient thermal energy to accelerate the hydrolysis reaction. Slowly dropping water can ensure the gradual progress of the reaction, avoid violent reactions that lead to the formation of by-products, and thus ensure the stability and reactivity of the titanate modifier; After the reaction is completed, absolute ethanol is removed at an evaporation temperature ≤ 60 °C to obtain the titanate surface modifier. After the reaction is completed, the purpose of removing absolute ethanol by evaporation is to remove the solvent and concentrate the titanate modifier. The evaporation temperature is controlled below 60 °C to avoid thermal degradation of the titanate modifier or incomplete removal of the solvent due to too high a temperature.

[0009] Preferably, the preparation of the epoxy compound modifier includes: Select bisphenol A epoxy resin (E-51) and dissolve it in toluene under the condition of 60 °C - 100 °C. E-51 is a commonly used bisphenol A epoxy resin with a high content of active epoxy groups. In the solvent toluene, the molecules of the epoxy resin can be fully dissolved. Toluene as a solvent can dissolve E-51 and provide an appropriate viscosity to ensure its uniform distribution and reaction in the subsequent reaction; Add diethylenetriamine and ethylene glycol ether to the solution and carry out a prepolymerization reaction at 40 °C - 80 °C for 1 - 3 hours to cause partial cross-linking reaction of the epoxy resin. The amino (-NH2) groups of diethylenetriamine have strong nucleophilicity and can react with the epoxy groups to form an amino ether structure, resulting in cross-linking reaction of the epoxy resin molecules. As an auxiliary cross-linking agent, ethylene glycol ether can further improve the cross-linking effect of the epoxy resin and enhance its mechanical properties and chemical stability. The reaction temperature is 40 °C to 80 °C, which can effectively promote the cross-linking reaction but will not be too high to cause resin degradation. The reaction time of 1 - 3 hours ensures that the epoxy groups in the epoxy resin are partially cross-linked but not completely cross-linked to maintain appropriate fluidity for subsequent operations; Finally, an epoxy compound modifier solution with moderate viscosity is obtained, which can be directly used for the modification of talc powder. The partial cross-linking reaction of the epoxy resin is to adjust its viscosity. Complete cross-linking will cause the epoxy resin to become solid or very viscous, which is not suitable for use in the subsequent modification of talc powder. Through partial cross-linking, an appropriate solution viscosity can be obtained, enabling it to be uniformly coated on the surface of talc powder during the surface modification process and not easily causing blockage or agglomeration.

[0010] Preferably, the supercritical fluid modification treatment includes: Add the pretreated talc powder and surface modifier mixture to a supercritical fluid reactor; Inject supercritical carbon dioxide into the reactor to a volume 10 - 30 times that of the talcum powder and modifier mixture. Supercritical carbon dioxide (SC-CO2) has the solubility of a liquid and the diffusivity of a gas. When supercritical carbon dioxide is injected into the reactor, it can penetrate and dissolve inorganic and organic modifiers, and at the same time has strong penetration power, enabling it to effectively enter the surface and pores of talcum powder. In this way, supercritical carbon dioxide can not only dissolve the modifier, but also promote the uniform contact and reaction between the modifier and the surface of talcum powder, ensuring that the modifier is uniformly attached to the surface of talcum powder; Adjust the temperature in the reactor to -30°C - 60°C and the pressure to -7 MPa - 20 MPa, and maintain for 20 minutes - 60 minutes. Temperature and pressure are the key factors determining the properties of supercritical carbon dioxide. Too low a temperature may lead to poor fluidity of carbon dioxide, making it difficult to fully penetrate the talcum powder particles and affecting the modification effect. On the contrary, too high a temperature may cause degradation of the modifier. Therefore, maintaining the temperature between -30°C and 60°C can ensure the fluidity and solubility of supercritical carbon dioxide while avoiding degradation of the modifier. Adjusting the pressure enables carbon dioxide to remain in the supercritical state and ensures that it has sufficient penetration power to penetrate deep into the surface structure of talcum powder and react fully with the surface modifier; Control the flow rate of supercritical carbon dioxide to be 0.5 L / min - 3 L / min. Controlling the flow rate of supercritical carbon dioxide between 0.5 L / min and 3 L / min aims to ensure sufficient contact between carbon dioxide and the talcum powder and modifier mixture, and to avoid too high a flow rate resulting in too fast an air flow and failure to fully penetrate into the interior of talcum powder particles. At the same time, a moderate flow rate can effectively utilize the solubility and diffusivity of carbon dioxide during the reaction process, ensuring the full reaction and uniform distribution of the modifier.

[0011] Preferably, the addition of the dual surface modifier includes: Add an inorganic surface modifier and an organic surface modifier simultaneously in the supercritical fluid reaction environment. The inorganic modifier (such as titanates) and the organic modifier (such as epoxides) play different roles in the surface modification of talcum powder. The inorganic modifier combines with the surface of talcum powder through strong chemical reactions, enhancing the compatibility and chemical bonding force between talcum powder and the matrix material, while the organic modifier improves the compatibility between talcum powder and the organic matrix (such as polymers) by enhancing the lipophilicity of talcum powder, helping to enhance the interfacial adhesion force between talcum powder and the matrix, and improving dispersibility and toughness. The two act synergistically to optimize the overall performance of talcum powder by forming modification layers with different properties on the surface of talcum powder respectively; The addition ratio of the inorganic surface modifier is 1:10 - 1:5 of talcum powder. The addition ratio of the inorganic surface modifier being 1:10 to 1:5 of talcum powder ensures that sufficient inorganic modifier can effectively cover the surface of talcum powder and undergo a strong chemical reaction with it. Too much inorganic modifier may lead to excessive chemical reactions or uneven coating, while too little may not form an ideal chemical bond; The addition ratio of the organic surface modifier is 0.1:10 - 0.5:10 of talcum powder. The ratio of the organic surface modifier being 0.1:10 to 0.5:10 of talcum powder is aimed at ensuring that the organic modifier can uniformly cover the surface of talcum powder, forming a thin organic modification layer and effectively improving the compatibility between talcum powder and the organic matrix; Utilizing the permeability and solubility of supercritical fluids, a double-layer modification structure is formed on the surface of talcum powder by the surface modifier. The inorganic modifier first forms a strongly bonded inorganic modification layer on the surface of talcum powder, and then the organic modifier further forms an organic modification layer on its surface through the action of supercritical carbon dioxide. The double-layer structure endows the surface of talcum powder with different chemical and physical properties, thereby enhancing its bonding force with the matrix and simultaneously optimizing the mechanical properties, thermal stability, and corrosion resistance of the composite material.

[0012] Preferably, the cooling and dispersion include: After the reaction ends, the temperature of the reaction environment is gradually decreased to -25°C - 40°C, and the pressure reduction rate is controlled within 50 - 100 mbar / min. The gradual decrease in temperature to the range of -25°C to 40°C enables the supercritical fluid in the reaction environment to gradually lose its ability to dissolve the modifier, promoting the precipitation of the modifier. During the cooling process, the temperature change is controlled to avoid the mutation effect caused by rapid cooling, thereby ensuring the uniform distribution of the modifier on the surface of talcum powder and the formation of a stable modification layer. The control of the pressure reduction rate between 50 - 100 mbar / min ensures the gradual release of gas in the reactor, avoiding the escape of the modifier or incomplete removal due to too rapid pressure reduction; Through the emission of gaseous supercritical carbon dioxide, the unreacted modifier is carried away, reducing the influence of residual compounds. As the pressure decreases, the unreacted modifier will gradually be carried away by gaseous carbon dioxide, thereby reducing the chemical residues that may have a negative impact on the properties of talcum powder or the final material; The ultrasonic dispersion technology is used to further disperse the modified talcum powder to make its particle size uniform and there is no obvious agglomeration between particles. After the cooling and pressure reduction are completed, the ultrasonic dispersion technology can effectively improve the dispersion of the modified talcum powder. The ultrasonic technology generates a high-frequency oscillation effect through acoustic wave vibration, causing the explosion of tiny bubbles in the liquid, forming a local high-temperature and high-pressure environment, thereby generating sufficient energy to break the attraction between talcum powder particles and promoting the uniform dispersion of the particles; The modified talcum powder is dried to ensure its stability and fluidity during storage. During the drying process, any residual solvents (such as supercritical carbon dioxide or modifier solvents) are removed to prevent moisture and residual solvents from affecting the fluidity and storage stability of the talcum powder.

[0013] Preferably, the ultrasonic dispersion technique for dispersing talcum powder includes: Ultrasonic power: 100 - 300 W. The power range of 100 - 300 W can generate acoustic vibrations of sufficient intensity, causing bubbles in the liquid to form and burst rapidly. This phenomenon is called the "cavitation effect". Through the cavitation effect, the tiny bubbles generated will rapidly collapse and release a large amount of energy in an extremely short time. This energy is transferred to the talcum powder particles in the suspension, generating a strong shear force that breaks the attraction between the talcum powder particles and promotes particle dispersion. Ultrasonic frequency: 20 - 40 kHz. Within this frequency range, the cavitation effect generated by the ultrasonic waves can form extremely small bubbles in the liquid. The energy released when these bubbles burst can generate local high temperatures and high pressures, effectively breaking the agglomeration between the talcum powder particles. Ultrasonic treatment time: 15 - 30 minutes. If the treatment time is too short, it may result in incomplete particle dispersion; while an overly long treatment time may cause thermal effects or unnecessary over - dispersion, leading to unstable particle sizes. 15 to 30 minutes is an optimized time range that can ensure uniform particle dispersion and effectively avoid agglomeration. The ultrasonic treatment is carried out at 20 - 25 °C to ensure uniform particle dispersion and no obvious agglomeration. Excessively high temperatures may cause solvent evaporation or modifier degradation. Therefore, controlling the temperature within the range of 20 - 25 °C can ensure the effectiveness of the ultrasonic effect while avoiding adverse reactions caused by excessively high temperatures.

[0014] Preferably, the drying treatment includes: Vacuum drying is used for drying. The drying conditions include that vacuum drying promotes the evaporation of moisture and other solvents by heating in a low - pressure environment. Since the boiling points of water and solvents decrease under low - pressure conditions, moisture and solvents can be removed at lower temperatures, thus avoiding thermal degradation or loss of modifiers caused by high temperatures. The drying process in a vacuum environment can accelerate the removal of volatile components and reduce the potential negative impact of temperature on the material, especially in terms of temperature - sensitive chemical components: Temperature range: 40 - 60 °C. During the drying process, the temperature is controlled within the range of 40 °C to 60 °C to balance the efficiency of removing moisture and solvents while avoiding the possible degradation or oxidation of the substances on the surface of the talcum powder caused by excessively high temperatures. Low pressure: 40 - 60 mbar. The use of a low-pressure environment (40 - 60 mbar) helps to lower the boiling points of water and solvents, enabling them to evaporate at relatively low temperatures. Meanwhile, in a low-pressure state, volatile substances are easily removed by suction, avoiding the wetting effect of incompletely evaporated solvents on talc powder particles; Drying time: 12 - 48 hours. Too short a time may result in incomplete drying, and residual moisture and solvents may affect the properties of talc powder; while too long a drying time may waste energy and affect efficiency. Therefore, the time range of 12 to 48 hours can ensure the uniform removal of all volatile components while avoiding energy waste or changes in the physical properties of particles caused by overly long drying times.

[0015] Preferably, the performance detection includes: Using X-ray diffraction to analyze the crystal structure changes of talc powder to confirm the attachment of surface modifiers; Adopting Fourier transform infrared spectroscopy to analyze the changes in surface chemical functional groups of talc powder to verify the modification effect; Determining the particle size distribution of modified talc powder by a laser particle size analyzer to confirm its particle size uniformity and dispersibility; Using an electronic universal testing machine and a pendulum impact testing machine to test the tensile strength, compressive strength, flexural strength, and impact toughness of the composite material to evaluate the mechanical properties of the modified talc powder.

[0016] The present invention provides a preparation method for high-performance modified materials based on talc powder. It has the following beneficial effects: 1. The present invention adopts a combination of surface modifiers and talc powder, achieving the technical effect of significantly improving the dispersibility and affinity of talc powder. Compared with the technical solutions using ordinary talc powder in the prior art, the present invention makes the talc powder uniformly distributed in the composite material through surface modification, avoiding particle agglomeration, and solving the deficiency of unstable mechanical properties caused by uneven particle dispersion in traditional methods.

[0017] 2. The present invention adopts an optimized modifier formula, enhancing the compatibility between talc powder and the polymer matrix, thereby significantly improving the tensile strength and impact strength of the composite material. Compared with the solutions of simply adding talc powder in the prior art, the present invention changes the types and ratios of modifiers, enabling the material to more effectively disperse stress when subjected to external force impact, and solving the problem of poor mechanical properties of traditional composite materials caused by insufficient modification of added talc powder.

[0018] 3. By introducing the reaction temperature control technology under supercritical conditions, the present invention achieves the technical effect of improving the modification effect. Compared with the technical solutions in the prior art where the temperature is not controlled or the reaction temperature is too high or too low, through precise temperature regulation, the surface modification of talcum powder by the present invention is more uniform, avoiding the uneven modification and performance fluctuation caused by inappropriate temperature in the traditional method.

[0019] 4. By adding a multifunctional modifier, a richer variety of chemical functional groups are formed on the surface of talcum powder particles, achieving the technical effect of improving the thermal stability and anti-aging performance of the composite material. Different from the prior art solutions that rely only on a single modifier, through the synergistic effect of multiple modifiers, the heat resistance of the material is enhanced by the present invention, solving the deficiencies of traditional materials being prone to degradation and loss of stability at high temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a flowchart of the method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the specification of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to the attached Figure 1 : Example 1: Material ratio (unit: part): Talcum powder: 100; Inorganic surface modifier (titanate): 1.5; Organic surface modifier (epoxy compound): 5; Anhydrous ethanol solution: 90; Titanium tetrabutoxide: 10; Deionized water: 2.

[0023] Preparation process: Pretreatment of talcum powder and surface modifier: Select 100 parts of talcum powder with a particle size of 10 μm.

[0024] Under normal pressure environment, mix the talcum powder, 1.5 parts of titanate modifier, and 5 parts of epoxy compound, control the stirring temperature at 50 °C, the rotation speed at 600 rpm, and the stirring time at 60 minutes to form a uniform mixture.

[0025] Preparation of titanate modifier: At 50 °C, 10 parts of tetrabutyl titanate are dissolved in 90 parts of anhydrous ethanol solution, and the concentration is controlled at 10%.

[0026] After stirring at 600 rpm for 30 minutes, 2 parts of deionized water are slowly added dropwise to form a titanate modifier solution.

[0027] Supercritical fluid modification: In a supercritical reactor, the mixed talc powder and modifier are added.

[0028] Inject supercritical carbon dioxide (15 times the volume of the mixture of talc powder and modifier).

[0029] Reaction conditions: temperature 35 °C, pressure 12 MPa, duration 40 minutes, CO2 flow rate 2 L / min.

[0030] Cooling and dispersion: Cool down to 30 °C, and the pressure reduction rate is 80 mbar / min.

[0031] Use an ultrasonic power of 150 W, a frequency of 25 kHz, and a time of 20 minutes for dispersion treatment.

[0032] Vacuum drying: Temperature 50 °C, low pressure 50 mbar, drying time 24 hours.

[0033] Performance testing: XRD, FTIR, particle size analysis, and mechanical property testing are carried out to ensure that the modification effect meets the expectations.

[0034] Example 2: Material ratio (unit: part): Talc powder: 110; Inorganic surface modifier (titanate): 2.5; Organic surface modifier (epoxide): 6; Anhydrous ethanol solution: 85; Tetrabutyl titanate: 12; Deionized water: 3.

[0035] Preparation process: Pretreatment of talc powder and surface modifier: Select 110 parts of talc powder with a particle size of 5 μm.

[0036] Under normal pressure environment, it is mixed with 2.5 parts of titanate and 6 parts of epoxide, the stirring temperature is 60 °C, the rotation speed is 800 rpm, and the stirring time is 90 minutes.

[0037] Preparation of titanate modifier: At 80 °C, 12 parts of tetrabutyl titanate are dissolved in 85 parts of anhydrous ethanol, and the concentration is 12%.

[0038] After stirring at 800 rpm for 1.5 hours, 3 parts of deionized water were slowly added dropwise to form a titanate modifier solution.

[0039] Supercritical fluid modification: The talcum powder and the modifier mixture were added to the reactor.

[0040] Supercritical carbon dioxide was injected (25 times the volume of the talcum powder and modifier mixture).

[0041] Reaction conditions: temperature 55 °C, pressure 18 MPa, duration 50 minutes, CO2 flow rate 2.5 L / min.

[0042] Cooling and dispersion: Cool down to 40 °C, with a pressure reduction rate of 70 mbar / min.

[0043] Dispersion was carried out using an ultrasonic power of 250 W, a frequency of 30 kHz, and a time of 25 minutes.

[0044] Vacuum drying: Temperature 60 °C, low pressure 45 mbar, drying time 36 hours.

[0045] Performance testing: XRD, FTIR, particle size analysis, and mechanical property testing were carried out.

[0046] Example 3: Material ratio (unit: part): Talcum powder: 95; Inorganic surface modifier (titanate): 1; Organic surface modifier (epoxy compound): 4; Anhydrous ethanol solution: 95; Tetrabutyl titanate: 8; Deionized water: 4.

[0047] Preparation process: Pretreatment of talcum powder and surface modifier: 95 parts of talcum powder with a particle size of 8 μm were selected.

[0048] Under normal pressure environment, it was mixed with 1 part of titanate and 4 parts of epoxy compound, stirred at a temperature of 45 °C, a rotation speed of 500 rpm, and a stirring time of 45 minutes.

[0049] Preparation of titanate modifier: At 60 °C, 8 parts of tetrabutyl titanate were dissolved in 95 parts of anhydrous ethanol, and the concentration was controlled at 8%.

[0050] After stirring at 500 rpm for 60 minutes, 4 parts of deionized water were slowly added dropwise to form a titanate modifier solution.

[0051] Supercritical fluid modification: The mixture of talcum powder and modifier was added to the reactor.

[0052] Supercritical carbon dioxide was injected (20 times the volume of the mixture of talcum powder and modifier).

[0053] Reaction conditions: temperature 45 °C, pressure 15 MPa, duration 30 minutes, CO2 flow rate 1.5 L / min.

[0054] Cooling and dispersion: Cool down to 35 °C, pressure reduction rate 90 mbar / min.

[0055] Dispersion was carried out using an ultrasonic power of 200 W, a frequency of 35 kHz, and a time of 18 minutes.

[0056] Vacuum drying: temperature 45 °C, low pressure 55 mbar, drying time 18 hours.

[0057] Performance testing: XRD, FTIR, particle size analysis, and mechanical property testing were carried out.

[0058] Comparative example 1: Compared with Example 1, the difference is that the inorganic surface modifier (titanate) was reduced to 1 part, and the rest were the same.

[0059] Comparative example 2: Compared with Example 1, the difference is that the organic surface modifier (epoxide) was reduced to 3 parts, and the rest were the same.

[0060] Design of comparative examples for Example 2: Comparative example 3: Compared with Example 2, the difference is that the inorganic surface modifier (titanate) was reduced to 2 parts, and the rest were the same.

[0061] Comparative example 4: Compared with Example 2, the difference is that the organic surface modifier (epoxide) was reduced to 4 parts, and the rest were the same.

[0062] Design of comparative examples for Example 3: Comparative example 5: Compared with Example 3, the difference is that the inorganic surface modifier (titanate) was reduced to 0.5 part, and the rest were the same.

[0063] Comparative example 6: Compared with Example 3, the difference lies in that the organic surface modifier (epoxy compound) is reduced to 3 parts, and the rest are the same.

[0064] Test Example 1: Experimental purpose: This experiment mainly studies the particle size distribution, specific surface area and bulk density of modified talc powder, and analyzes the influence of different modification processes on the physical properties of the powder.

[0065] Experimental instruments and equipment: Laser particle size analyzer (for measuring particle size distribution); Specific surface area analyzer (BET method) (for measuring specific surface area); Bulk density measuring instrument (for measuring the bulk density of the powder); Electronic balance (for accurately weighing samples); Drying oven (to ensure that the samples are under constant humidity conditions).

[0066] Experimental procedure: Sample preparation: Take 10 g of dried talc powder samples (Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4, 5, 6).

[0067] Sieve through a 100-mesh sieve to ensure that there are no large particle agglomerates in the samples.

[0068] Store the samples in a desiccator for further testing.

[0069] Particle size distribution measurement: Take 0.5 g of the sample and disperse it in anhydrous ethanol.

[0070] Use an ultrasonic disperser (100 W, 15 minutes) for pretreatment to prevent particle agglomeration.

[0071] Use a laser particle size analyzer for testing and record D10, D50, D90 (representing 10%, 50%, and 90% of the particle sizes respectively).

[0072] Specific surface area measurement: Take 1 g of the sample and place it in a specific surface area analyzer for measurement.

[0073] Adopt the BET nitrogen adsorption method to calculate the specific surface area (m 2 / g).

[0074] Record the data and repeat 3 times to take the average value.

[0075] Bulk density measurement: Take 5 g of the sample and fill it into a standard container (capacity 100 mL) using a funnel.

[0076] After tamping 3 times, measure the filling volume V (mL).

[0077] Calculate the bulk density.

[0078] ; Record the data, repeat 3 times and take the average value. The experimental results are shown in Table 1.

[0079] Table 1: Test results of particle size distribution, specific surface area and bulk density of talcum powder It can be seen from Table 1 that: First of all, the experiments show that Examples 1-3 have finer particle distribution and higher specific surface area compared with the comparative sample. This is related to the refinement and dispersion of talcum powder through physical mechanisms during the modification process. During the reaction process, the introduction of inorganic modifiers (such as titanates) can effectively change the surface properties of talcum powder, making the particle surface have certain hydrophilic or lipophilic properties, which helps the powder to disperse more evenly in the solvent. The refinement of particles directly leads to an increase in specific surface area, making the modified talcum powder have better reaction activity and surface functionalization ability. Therefore, by appropriately chemically modifying the surface of talcum powder, its efficacy and performance stability in applications can be significantly improved.

[0080] Secondly, the difference in bulk density can be explained by the interaction force between particles. A lower bulk density means a larger distance between powder particles. Usually, this is because a strong repulsive force or charge effect is formed on the particle surface during the modification process, thereby reducing the agglomeration of particles. Examples 1-3 controlled the enhancement of this repulsive force through appropriate modifiers, making the particles easier to disperse and less likely to agglomerate. In contrast, due to the lack of modifiers in the comparative sample, the particles have stronger agglomeration and higher bulk density, indicating that the interaction force between particles is stronger, resulting in poor dispersibility.

[0081] Finally, the selection and dosage of modifiers cannot be ignored for their influence on particle distribution and specific surface area. The experimental results show that the appropriate ratio of inorganic modifiers and organic surface modifiers is crucial for the structural optimization of the powder. The introduction of inorganic modifiers (such as titanates) can not only provide a more stable surface to avoid excessive affinity between particles, but also form chemical bonds with the talcum powder surface during the chemical reaction process to further enhance its surface properties. The organic modifiers provide better interfacial functions, improving the dispersibility and compatibility of talcum powder. Generally speaking, the reasonable regulation of the modification process can significantly improve the physical properties of talcum powder, thereby enhancing its performance in practical applications.

[0082] Test Example 2: Purpose of the experiment: This experiment aims to analyze the effects of different modification processes on the surface functional groups of talc powder. By using Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS) techniques, the chemical changes during the modification process are evaluated to determine the mechanism of the modification effect.

[0083] Experimental instruments and equipment: Fourier Transform Infrared Spectrometer (FTIR): Used to detect the changes in the surface functional groups of talc powder and analyze the introduction and disappearance of surface functional groups during the modification process.

[0084] X-ray Photoelectron Spectroscopy (XPS) instrument: Used to analyze the chemical composition and bonding state of the elements on the surface of talc powder, especially the reaction of the surface modifier with talc powder.

[0085] Electronic balance: Used to accurately weigh samples.

[0086] Vacuum drying oven: Ensures that the samples are kept dry before testing.

[0087] Experimental procedures: Sample preparation: Take 10 g of talc powder samples (Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4, 5, 6), and conduct vacuum drying at 60 °C for 12 hours to ensure that the samples are completely dry.

[0088] Place the samples in a desiccator for storage and await testing.

[0089] Fourier Transform Infrared Spectroscopy (FTIR) test: Take 1 g of the sample and use the FTIR spectrometer to measure the infrared spectrum of the sample.

[0090] Collect the wavenumber range from 4000 cm -1 to 400 cm -1 and record the absorption peaks of talc powder.

[0091] Analyze the changes in the positions and intensities of the absorption peaks of the surface functional groups of talc powder (such as -OH, -COOH, -NH2, etc.) to confirm the addition of the modifier.

[0092] X-ray Photoelectron Spectroscopy (XPS) test: Take 0.5 g of the sample and use the XPS instrument for surface element analysis.

[0093] Measure the bonding states of the main elements on the surface of talc powder (such as Si, O, Mg) and record the corresponding chemical binding energies.

[0094] Analyze the bonding situation of the surface modifier (such as titanate, organic surface modifier) with talc powder. The experimental results are shown in Table 2.

[0095] Table 2: Analysis Results of Surface Functional Groups and Elemental Composition of Talc Powder It can be seen from Table 2 that: Firstly, more -OH and -Si-OH groups appeared on the surface of the talc powder in Examples 1 - 3, which is closely related to the action mechanism of the surface modifier. During the modification process, inorganic modifiers (such as titanates) usually combine with the surface of talc powder through chemical reactions to form stable chemical bonds. This reaction not only changes the hydrophilicity of the talc powder surface but also enhances its affinity with other substances by introducing new functional groups (such as -OH), thereby enhancing its dispersibility and binding force when used as a filler. In contrast, due to the lack of modifiers in the comparative sample, more surface functional groups could not be introduced, resulting in less change in its surface chemical properties, indicating poor modification effect.

[0096] Secondly, the experimental data show that the increase in organic groups (such as -COOH) on the surface of the talc powder in Example 3 reflects the role of the organic surface modifier during the modification process. By introducing the organic modifier, the surface of the talc powder can not only improve hydrophilicity but also enhance its compatibility with the polymer matrix. Organic modifiers usually react with the surface functional groups of talc powder to form new chemical bonds, thereby increasing the surface functionality. This surface modification mechanism is of great significance for improving the mechanical properties and thermal stability of talc powder. However, due to the lack of effective organic modifiers in the comparative sample, sufficient organic groups could not be introduced, so the modification effect is lacking.

[0097] Finally, from the XPS data, the changes in the binding energy positions of the surface elements of the talc powder in Examples 1 - 3 further verify the effect of the modification process. By introducing the modifier, slight changes occurred in the binding energies of Si, O, and Mg elements on the surface of the talc powder, reflecting that the modifier reacted with the surface of the talc powder, which enhanced its surface stability and reactivity. Especially in Example 3, the binding energy of Mg2p increased slightly, indicating that not only did the functional groups change on the surface of the talc powder, but there may also have been a more in-depth chemical interaction with the modifier. In contrast, the XPS results of the comparative sample show that the lack of reactivity of the modifier and the introduction of chemical functional groups led to no significant change in the binding energies of its surface elements, further proving the insufficient surface modification.

[0098] Test Example 3: Experimental Purpose: This experiment aims to evaluate the dispersibility and stability of different modified talc powders in organic media (such as epoxy resin, polypropylene), and to test the influence of different modification processes on the dispersion performance of talc powder in composite materials. The dispersion of talc powder was analyzed by transmission electron microscopy (TEM) and sedimentation test method.

[0099] Experimental Instruments and Equipment: Transmission Electron Microscope (TEM): Used to observe the dispersion state of talcum powder in different solvents.

[0100] Sedimentation Test Device: Used to measure the dispersion stability of talcum powder in organic solvents.

[0101] Electronic Balance: Used to accurately weigh samples.

[0102] Rotary Viscometer: To determine the rheology of the sample and indirectly reflect its dispersion state.

[0103] Glass Measuring Cylinder and Sedimentometer: Used to record the sedimentation rate of talcum powder in the solvent.

[0104] Experimental Procedures: Sample Preparation: Take 5 g of talcum powder samples (Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4, 5, 6), and dry them in a vacuum drying oven at 60 °C for 12 hours to ensure that the samples are moisture-free.

[0105] Take the dried talcum powder samples and weigh 0.5 g of the talcum powder samples.

[0106] Dissolve the samples in 50 mL of absolute ethanol and perform preliminary dispersion using an ultrasonic cleaner (100 W, 15 minutes).

[0107] Transmission Electron Microscope (TEM) Test: Take 1 mL from the sample solution and drop it onto the TEM sample stage.

[0108] Use a transmission electron microscope (TEM) to observe the dispersion state of talcum powder particles.

[0109] Record the particle dispersibility of different samples and observe whether there is agglomeration of particles.

[0110] Sedimentation Test: Take 50 mL of the talcum powder dispersion (the above solution) and pour it into a glass measuring cylinder.

[0111] Record the sedimentation time every 5 minutes for 1 hour until most of the particles settle.

[0112] Record the particle sedimentation rate and calculate its stability.

[0113] Rotary Viscometer Test: Take 50 mL of the talcum powder dispersion and measure the viscosity of the sample with a rotary viscometer.

[0114] Indirectly infer the dispersion stability of talcum powder through the change in viscosity. High viscosity usually means particle agglomeration. The experimental results are shown in Table 3.

[0115] Table 3: Test Results of Talc Powder Dispersibility and Stability It can be seen from Table 3 that: First of all, the talc powder in Examples 1 - 3 shows good dispersibility in the solvent, with particles evenly distributed and almost no agglomeration. This is due to the introduction of surface modifiers, which form a stable interfacial structure on the surface of the talc powder. Modifiers such as inorganic titanates and organic surface modifiers bind to the surface of the talc powder through chemical bonds or physical adsorption, enhancing the mutual repulsive force between particles. This repulsive force prevents particle aggregation, maintains particle dispersibility and stability, and thus improves the fluidity and viscosity of the solution.

[0116] Secondly, the dispersibility of the comparative sample in the experiment is poor, with particles significantly aggregated and a relatively fast sedimentation rate. This indicates that these comparative samples lack sufficient modifiers or the dosage of modifiers is insufficient, resulting in ineffective interfacial modification on the surface of the talc powder. Without sufficient modifiers, there is a lack of mutual repulsive force on the surface of the talc powder particles, making them prone to agglomeration. The particles settle faster in the solution, showing a higher viscosity. This agglomeration effect is caused by the strong van der Waals force between particles, which cannot be effectively inhibited without modifiers.

[0117] Finally, the mechanism of action of the modifier is further reflected in the dispersion stability. An effective modifier not only enhances the hydrophilicity or lipophilicity of the particle surface through physical adsorption but also forms strong chemical bonds with the surface of the talc powder through chemical reactions, which enables the talc powder to be well compatible with other components in the solvent and prevents mutual aggregation of particles. Especially for the talc powder in Example 3, an optimized modification process is adopted, making the dispersibility of the talc powder reach the best state. At this time, the surface of the talc powder particles is no longer smooth but forms a surface with different functional groups through chemical modification. The formation of this structure effectively inhibits particle agglomeration and improves the overall dispersion effect.

[0118] Test Example 4: Experimental Purpose: This experiment aims to test the mechanical properties of different modified talc powders in polymer composites, with a focus on evaluating the tensile strength and impact strength. Through the testing of these mechanical properties, the effects of different modification processes on the composites can be evaluated, especially the mechanical stability in practical applications.

[0119] Experimental Instruments and Equipment: Universal Material Testing Machine: Used to measure the tensile strength and elongation.

[0120] Impact Testing Machine: Used to measure the impact strength of the composite material.

[0121] Electronic Balance: Used to accurately weigh samples.

[0122] Injection molding machine: used for preparing composite material samples.

[0123] Oven: used for heat-treating the composite material to ensure sample consistency.

[0124] Experimental procedures: Preparation of composite materials: Take 40 g of talcum powder samples (Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4, 5, 6).

[0125] Mix the talcum powder evenly with 60 g of epoxy resin or polypropylene (by weight ratio 1:1) to ensure full dispersion of the powder.

[0126] Use an injection molding machine to make standard tensile specimens and impact specimens from the mixture.

[0127] Put the injection-molded specimens into an oven and cure them at 60 °C for 6 hours to ensure the uniformity and stability of the composite material.

[0128] Tensile property test: Take the cured tensile specimens and conduct tensile tests using a universal material testing machine.

[0129] Record the tensile strength (MPa) and elongation rate (%) of the samples.

[0130] Conduct three tests and record the average value to ensure the accuracy of the results.

[0131] Impact property test: Take the cured impact specimens and conduct impact tests using an impact testing machine.

[0132] Measure the impact strength (J / m 2 ) of each sample.

[0133] Conduct three tests and record the average value. The experimental results are shown in Table 4.

[0134] Table 4: Test results of the mechanical properties of modified talcum powder composite materials It can be seen from Table 4 that: First, the composite materials of Examples 1 - 3 exhibited high tensile strength and impact strength, indicating that the dispersibility of talc powder was significantly improved through surface modification treatment. The modifier enhanced the compatibility between the talc powder and the matrix material by introducing specific functional groups (such as -OH, -COOH, etc.) on the surface of the talc powder. These modifiers not only improved the dispersibility of the talc powder particles but also formed a stable interfacial structure through chemical adsorption or physical adsorption, thereby reducing the agglomeration phenomenon between the particles. The modified talc powder could be more evenly distributed in the polymer matrix, thus enhancing the mechanical properties of the composite material.

[0135] In addition, Example 3 exhibited the best mechanical properties, with both its tensile strength and impact strength being superior to those of other examples. This can be attributed to the optimal modification process. By optimizing the type and dosage of the modifier, the surface of the talc powder was fully modified, forming a stronger interfacial bonding force. The talc powder particles existed in a state of smaller particles and uniform distribution in the composite material. When the composite material was subjected to external forces, the stress could be effectively dispersed, avoiding the occurrence of local stress concentration. Especially in the impact test, the surface-modified talc powder particles could better disperse the impact force, showing a higher impact strength.

[0136] In contrast, the mechanical properties of the comparative example samples were poor. Especially in the tensile and impact tests, they showed lower strength and elongation. This was because the talc powder particles in these comparative example samples were not effectively surface-modified, resulting in a lack of sufficient repulsive force between the particles and easy formation of agglomeration. Particle agglomeration would increase the defects in the material, leading to a decline in mechanical properties. In the polymer matrix, the agglomerated talc powder particles could not be fully combined with the matrix and could not effectively transfer stress, thus affecting the overall mechanical properties of the composite material. This result indicates that surface modification plays a crucial role in improving the interfacial bonding force between the talc powder and the matrix material and thereby enhancing the mechanical properties of the composite material.

[0137] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Preparation method of high-performance modified material based on talcum powder, characterized in that, It includes the following steps: S1. Pretreatment of talcum powder and surface modifier: Screen the particle size of talcum powder and mix it with inorganic and organic modifiers; S2. Supercritical fluid modification treatment: Place the mixed talcum powder and surface modifier in a supercritical fluid reaction environment for treatment to make the modifier evenly adhere to the surface of talcum powder; S3. Addition of double surface modifiers: Synchronously introduce inorganic and organic modifiers in the supercritical fluid environment to form a double modification layer; S4. Cooling and dispersion: Gradually reduce the temperature and pressure of the reaction environment and ensure the uniform dispersion of modified talcum powder through mechanical dispersion means; S5. Performance detection: Test the crystal structure, particle size distribution and mechanical properties of modified talcum powder to ensure that the modification effect meets the expected requirements.

2. The preparation method of the high-performance modified material based on talcum powder according to claim 1, characterized in that The pretreatment of the talcum powder and the surface modifier includes: Select talcum powder with a particle size of 1 - 15μm and 90 - 110 parts; Select 0.5 - 3 parts of inorganic surface modifier, and the inorganic surface modifier is titanate; Select 2 - 8 parts of organic surface modifier, and the organic surface modifier is epoxy compound; Use mechanical stirring, control the rotation speed at 300 - 800rpm, the stirring time at 30 - 90 minutes, and the stirring temperature at 25 - 60°C, and mix the talcum powder and the surface modifier under normal pressure environment.

3. The preparation method of the high-performance modified material based on talcum powder according to claim 2, wherein, The preparation of the titanate modifier includes: Take 5 - 15 parts of tetrabutyl titanate, add 85 - 95 parts of anhydrous ethanol solution, and control the concentration at 5 - 15%; Under the stirring rate of 300 - 800rpm, the stirring time of 30 minutes - 2 hours, and the temperature condition of 50 - 80°C, stir to promote the formation of titanate, and slowly drop 1 - 5 parts of deionized water to form a titanate modifier solution; After the reaction ends, remove anhydrous ethanol at an evaporation temperature ≤60°C to obtain the titanate surface modifier.

4. The preparation method of the high-performance modified material based on talcum powder according to claim 2, wherein, The preparation of the epoxy compound modifier includes: Select E - 51 and dissolve it in toluene under the condition of 60°C - 100°C; Add diethylenetriamine and ethylene glycol ether to the solution and carry out a pre - polymerization reaction for 1 - 3 hours under the condition of 40°C - 80°C to make the epoxy resin undergo a partial cross - linking reaction; Finally, obtain an epoxy compound modifier solution with moderate viscosity, which can be directly used for modifying talcum powder.

5. The preparation method of the high-performance modified material based on talcum powder according to claim 2, characterized in that The supercritical fluid modification treatment includes: Add the pretreated mixture of talcum powder and surface modifier to a supercritical fluid reactor; Inject supercritical carbon dioxide into the reactor to make its volume reach 10 - 30 times that of the mixture of talcum powder and modifier; Adjust the temperature in the reactor to - 30°C - 60°C and the pressure to - 7MPa - 20MPa, and maintain for 20 minutes - 60 minutes; Control the flow rate of supercritical carbon dioxide at 0.5L / min - 3L / min.

6. The preparation method of the high-performance modified material based on talcum powder according to claim 1, characterized in that, The addition of the double surface modifiers includes: Simultaneously add inorganic surface modifier and organic surface modifier in the supercritical fluid reaction environment; The addition ratio of the inorganic surface modifier is 1:10 - 1:5 of talcum powder; The addition ratio of the organic surface modifier is 0.1:10 - 0.5:10 of talcum powder; By utilizing the permeability and solubility of supercritical fluids, a double-layer modified structure of the surface modifier is formed on the surface of talcum powder.

7. The preparation method of the high-performance modified material based on talcum powder according to claim 1, characterized in that, The temperature reduction and dispersion include: After the reaction ends, gradually reduce the reaction environment temperature to -25°C - 40°C, and control the pressure reduction rate at 50 - 100 mbar / min; Through the emission of gaseous supercritical carbon dioxide, remove the unreacted modifier and reduce the influence of residual compounds; Adopt ultrasonic dispersion technology to further disperse the modified talcum powder to make its particle size uniform and there is no obvious agglomeration between particles; Dry the modified talcum powder to ensure its stability and fluidity during storage.

8. The preparation method of the high-performance modified material based on talcum powder according to claim 7, characterized in that, The ultrasonic dispersion technology for dispersing talcum powder includes: Ultrasonic power: 100 - 300 W; Ultrasonic frequency: 20 - 40 kHz; Ultrasonic treatment time: 15 - 30 minutes; The ultrasonic treatment is carried out at 20 - 25°C to ensure uniform dispersion of particles and no obvious agglomeration phenomenon.

9. The preparation method of the high-performance modified material based on talcum powder according to claim 7, characterized in that, The drying treatment includes: Use vacuum drying for drying, and the drying conditions include: Temperature range: 40 - 60°C; Low pressure: 40 - 60 mbar; Drying time: 12 - 48 hours.

10. The preparation method of the high-performance modified material based on talcum powder according to claim 1, wherein, The performance detection includes: Use X-ray diffraction to analyze the crystal structure change of talcum powder and confirm the attachment of the surface modifier; Adopt Fourier transform infrared spectroscopy to analyze the change of surface chemical functional groups of talcum powder and verify the modification effect; Determine the particle size distribution of the modified talcum powder by a laser particle size analyzer to confirm its particle size uniformity and dispersion; Use an electronic universal testing machine and a pendulum impact testing machine to test the tensile strength, compressive strength, flexural strength and impact toughness of the composite material to evaluate the mechanical properties of the modified talcum powder.

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