Antistatic flame-retardant pa5t / 56 composite material and preparation method thereof

Abstract

The application discloses an antistatic flame-retardant PA5T / 56 composite material and a preparation method thereof, and relates to the technical field of polymer materials.The composite material comprises the following components in percentage by mass: PA5T / 56 resin 45-60%, glass fiber 20-40%, silane-modified nano carbon black 10-15%, stearic acid-modified nano calcium carbonate 5-10% and antioxidant 0.5-2%.The synergistic effect of the combination of the silane-modified nano carbon black and the stearic acid-modified nano calcium carbonate can effectively improve the antistatic property and the flame-retardant property of the PA5T / 56 material;the interface bonding of the glass fiber and the PA5T / 56 matrix can transfer load and disperse stress, thereby improving the rigidity of the material;and the addition of the antioxidant can improve the thermal stability of the composite material.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high polymer materials, and particularly relates to an antistatic flame-retardant PA5T / 56 composite material and a preparation method thereof. BACKGROUND

[0002] With the increasing awareness of environmental protection and non-renewable resource protection, the development and application of bio-based monomers have made remarkable progress, promoting the diversified development of bio-based amide materials. At present, PA5T, PA10T and other materials synthesized from bio-based monomers have been widely used in the market and have shown excellent performance.

[0003] PA5T / 56 is a high-performance semi-aromatic polyamide material that combines the properties of PA5T (poly-p-xylylene adipamide) and PA56 (polyhexamethylene adipamide) and still maintains good mechanical properties and heat resistance under high temperature and high pressure. To further improve its performance, glass fibers are usually used for reinforcement to improve the mechanical strength, rigidity and thermal stability of the material. However, the traditional glass fiber reinforced PA5T / 56 composite material has obvious limitations: on the one hand, its surface resistivity is as high as 10 15 Ω, which easily accumulates static electricity, causing interference with sensitive components in electronic and electrical applications; on the other hand, its flame retardant performance is difficult to meet the strict UL94-V0 standard, limiting its application in electronic device structural parts, automotive electrical components and the like.

[0004] Therefore, developing a PA5T / 56 composite material with high strength, antistatic and excellent flame retardant performance has become a technical problem to be solved in the current material field. SUMMARY

[0005] The application aims to provide an antistatic flame-retardant PA5T / 56 composite material and a preparation method thereof to at least solve the above technical problems.

[0006] To achieve the above-mentioned purpose, the first aspect of the application provides an antistatic flame-retardant PA5T / 56 composite material, which comprises the following components in mass percentage: PA5T / 56 resin 45%-60%, glass fiber 20%-40%, silane modified nano carbon black 10%-15%, stearic acid modified nano calcium carbonate 5%-10% and antioxidant 0.5%-2%.

[0007] In the first aspect, the glass fiber is a short-cut glass fiber that has been surface treated.

[0008] In the first aspect, the preparation method of the silane-modified nano-carbon black comprises: placing nano-carbon black in isopropyl alcohol, ultrasonic dispersion to obtain a nano-carbon black / isopropyl alcohol suspension; dissolving a silane coupling agent in anhydrous ethanol, ultrasonic dispersion to obtain a silane coupling agent / ethanol mixed solution; placing the nano-carbon black / isopropyl alcohol suspension and the silane coupling agent / ethanol mixed solution in a three-necked flask, stirring at 90-100 DEG C for 4-6 h to obtain a reaction liquid; filtering, washing and drying the reaction liquid to obtain the silane-modified nano-carbon black.

[0009] In the first aspect, the volume ratio of the silane coupling agent to the anhydrous ethanol is 1:100-2:100; and the addition amount of the silane coupling agent is 10-20% of the mass of the nano-carbon black.

[0010] In the first aspect, the preparation method of the stearic acid-modified nano-carbonate calcium comprises: placing nano-carbonate calcium in anhydrous ethanol, ultrasonic dispersion to obtain a nano-carbonate calcium / ethanol suspension; ultrasonic dispersion of stearic acid and anhydrous ethanol with a volume ratio of 1:100-5:100 at 45-50 DEG C to obtain a stearic acid / ethanol solution; placing the nano-carbonate calcium / ethanol suspension and the stearic acid / ethanol solution in a three-necked flask, stirring at 60-80 DEG C for 1-2 h to obtain a reaction liquid; filtering, washing, drying and grinding the reaction liquid to obtain the stearic acid-modified nano-carbonate calcium.

[0011] In the first aspect, the addition amount of the stearic acid is 2-5% of the mass of the nano-carbonate calcium.

[0012] In the first aspect, the antioxidant is N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine.

[0013] The second aspect of the application provides a preparation method of an antistatic flame-retardant PA5T / 56 composite material, which comprises: preparing silane-modified nano-carbon black; preparing stearic acid-modified nano-carbonate calcium; weighing each component of a composite material raw material, wherein the raw material components comprise: A5T / 56 resin 45%-60%, glass fiber 20%-40%, silane-modified nano-carbon black 10%-15%, stearic acid-modified nano-carbonate calcium 5%-10% and antioxidant 0.5%-2%; pre-mixing the A5T / 56 resin, the silane-modified nano-carbon black, the stearic acid-modified nano-carbonate calcium and the antioxidant to obtain an initial mixture; adding the initial mixture from a main feeding hopper and conveying it into the screw cavity of a double-screw extruder; adding the glass fiber from a side feeding hopper and conveying it into the screw cavity of the double-screw extruder; and heating, melting, extruding and granulating to obtain the antistatic flame-retardant PA5T / 56 composite material.

[0014] In the second aspect, the preparation of the silane-modified nanometer carbon black specifically comprises: weighing nanometer carbon black and silane coupling agent with a mass fraction of 10-20% respectively; placing the nanometer carbon black in isopropyl alcohol, ultrasonic dispersion, to obtain a nanometer carbon black / isopropyl alcohol suspension; ultrasonic dispersion of silane coupling agent and anhydrous ethanol with a volume ratio of 1:100-2:100, to obtain a silane coupling agent / ethanol mixed solution; placing the nanometer carbon black / isopropyl alcohol suspension and the silane coupling agent / ethanol mixed solution in a three-necked flask, and stirring at 90-100 DEG C for 4-6 h, to obtain a reaction liquid; filtering and washing the reaction liquid, to obtain a filter cake; drying the filter cake in a vacuum drying oven at 100 DEG C, to obtain the silane-modified nanometer carbon black.

[0015] In the second aspect, the preparation of the stearic acid-modified nanometer calcium carbonate specifically comprises: weighing nanometer calcium carbonate and stearic acid with a mass fraction of 2-5% respectively; placing the nanometer calcium carbonate in anhydrous ethanol, ultrasonic dispersion, to obtain a nanometer calcium carbonate / ethanol suspension; ultrasonic dispersion of stearic acid and anhydrous ethanol with a volume ratio of 1:100-5:100 at 45-50 DEG C, to fully dissolve, to obtain a stearic acid / ethanol solution; placing the nanometer calcium carbonate / ethanol suspension and the stearic acid / ethanol solution in a three-necked flask, and stirring at 60-80 DEG C for 1-2 h, to obtain a reaction liquid; filtering and washing the reaction liquid, to obtain a filter cake; drying the filter cake in a vacuum drying oven at 100 DEG C, and grinding, to obtain the stearic acid-modified nanometer calcium carbonate.

[0016] Beneficial effects:

[0017] The anti-static and flame-retardant PA5T / 56 composite material provided by the application comprises, in mass percentage, 45-60% of PA5T / 56 resin, 20-40% of glass fiber, 10-15% of silane-modified nanometer carbon black, 5-10% of stearic acid-modified nanometer calcium carbonate and 0.5-2% of antioxidant. The nanometer carbon black and nanometer calcium carbonate are subjected to surface modification treatment, and the two are used in combination, so that the anti-static and flame-retardant modification of the PA5T / 56 composite material is carried out. The silane-modified nanometer carbon black subjected to surface modification can be uniformly dispersed in the resin, forming a conductive path, thereby reducing the surface resistivity of the material, and also capturing free radicals in the combustion process, thereby improving the flame-retardant performance of the material. The stearic acid-modified nanometer calcium carbonate subjected to surface modification has good interfacial compatibility with the PA5T / 56 resin, can play a synergistic effect with the silane-modified nanometer carbon black in the resin matrix, and together build a more unobstructed conductive path, and realize synergistic flame retardation through the gas phase and the condensed phase. The combination of the silane-modified nanometer carbon black and the stearic acid-modified nanometer calcium carbonate can reduce the addition amount of a single conductive or flame-retardant material, thereby reducing the cost while realizing synergistic reinforcement. In addition, the glass fiber and the antioxidant added can effectively improve the rigidity and high-temperature resistance of the material. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic flowchart illustrating a method for preparing an antistatic and flame-retardant PA5T / 56 composite material provided by the present invention. Detailed Implementation

[0020] The present invention will be described in detail below with reference to specific embodiments and examples, thereby making the advantages and various effects of the present invention more clearly apparent. Those skilled in the art should understand that these specific embodiments and examples are for illustrative purposes only and are not intended to limit the present invention.

[0021] Throughout this specification, unless otherwise specified, the terminology used herein should be understood as having the meaning commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In the event of any conflict, this specification shall prevail.

[0022] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be obtained by purchasing them from the market or by existing methods.

[0023] The present invention provides an antistatic and flame-retardant PA5T / 56 composite material, wherein the composite material comprises the following components by mass percentage: 45%-60% PA5T / 56 resin, 20%-40% glass fiber, 10%-15% silane-modified nano carbon black, 5%-10% stearic acid-modified nano calcium carbonate and 0.5%-2% antioxidant.

[0024] The glass fiber is a short-cut glass fiber that has undergone surface treatment.

[0025] As one embodiment, the preparation method of silane-modified nano-carbon black includes: placing nano-carbon black in isopropanol and ultrasonically dispersing it to obtain a nano-carbon black / isopropanol suspension; dissolving a silane coupling agent in anhydrous ethanol and ultrasonically dispersing it to obtain a silane coupling agent / ethanol mixed solution; placing the nano-carbon black / isopropanol suspension and the silane coupling agent / ethanol mixed solution in a three-necked flask and stirring at 90-100℃ for 4-6 hours to obtain a reaction solution; filtering, washing, and drying the reaction solution to obtain silane-modified nano-carbon black.

[0026] The volume ratio of the silane coupling agent to the anhydrous ethanol is 1:100-2:100; the addition amount of the silane coupling agent is 10-20% of the mass of the nano carbon black.

[0027] As one of the embodiments, the preparation method of the stearic acid modified nano calcium carbonate comprises: placing nano calcium carbonate in anhydrous ethanol, ultrasonic dispersion to obtain a nano calcium carbonate / ethanol suspension; ultrasonic dispersion of stearic acid and anhydrous ethanol with a volume ratio of 1:100-5:100 at 45-50℃ to obtain a stearic acid / ethanol solution; placing the nano calcium carbonate / ethanol suspension and the stearic acid / ethanol solution in a three-necked flask and stirring at 60-80℃ for 1-2h to obtain a reaction liquid; filtering, washing, drying and grinding the reaction liquid to obtain the stearic acid modified nano calcium carbonate.

[0028] The addition amount of the stearic acid is 2-5% of the mass of the nano calcium carbonate.

[0029] As one of the embodiments, the antioxidant is N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine.

[0030] Based on one overall inventive concept, as shown in Figure 1 The second aspect of the present application provides a preparation method of an antistatic flame-retardant PA5T / 56 composite material, which comprises:

[0031] S1, preparing silane modified nano carbon black;

[0032] S2, preparing stearic acid modified nano calcium carbonate;

[0033] S3, weighing each component of the composite material raw material, which comprises: A5T / 56 resin 45%-60%, glass fiber 20%-40%, silane modified nano carbon black 10%-15%, stearic acid modified nano calcium carbonate 5%-10% and antioxidant 0.5%-2%;

[0034] S4, pre-mixing the A5T / 56 resin, the silane modified nano carbon black, the stearic acid modified nano calcium carbonate and the antioxidant to obtain an initial mixture;

[0035] S5, adding the initial mixture from the main hopper to the screw cavity of the twin-screw extruder, adding the glass fiber from the side hopper to the screw cavity of the twin-screw extruder, and then heating, melting, extruding and granulating to obtain the antistatic flame-retardant PA5T / 56 composite material; wherein the processing temperature of the twin-screw extruder is controlled at 300-325℃, and the main machine speed is 370-430rpm.

[0036] The present application will be further described in conjunction with specific examples. It should be understood that these examples are only used to illustrate but not to limit the scope of the present application. The experimental methods in the following examples, if no specific conditions are noted, are generally determined according to the national standards. If there is no corresponding national standard, the general international standards, conventional conditions, or the conditions suggested by the manufacturers are used.

[0037] The raw materials used in the examples and comparative examples are as follows:

[0038] PA5T / 56 resin: self-made, the molar ratio of PA5T and PA56 structural units is 3 / 2, and the melting point thereof is about 310°C.

[0039] Glass fiber: short-cut glass fiber treated with silane-based impregnant on the surface; China Jushi Co., Ltd., ECS11-03-560A short-cut glass fiber.

[0040] Nano carbon black: Cabot N220, Shanghai Boding Chemical Co., Ltd.

[0041] Silane-modified nano carbon black: an appropriate amount of nano carbon black and 10-20% by mass of KH550 silane coupling agent are weighed, the carbon black is dissolved in isopropyl alcohol, and ultrasonic dispersion is performed for 30 min to prepare a nano carbon black / isopropyl alcohol suspension; a mixture of KH550 silane coupling agent and anhydrous ethanol is prepared at a volume ratio of 1:100, ultrasonic dispersion is performed for 30 min to prepare a silane coupling agent / ethanol mixed solution; the nano carbon black / isopropyl alcohol suspension and the silane coupling agent / ethanol mixed solution are mixed in a three-necked flask, and stirring is performed at 90°C for 4 h; after filtration and multiple washing with anhydrous ethanol, drying is performed in a vacuum drying oven at 100°C until a constant weight is obtained to prepare the silane-modified nano carbon black.

[0042] Nano calcium carbonate: LP-600, Shanghai Liangjiang Titanium White Chemical Products Co., Ltd., average path 15-40 nm;

[0043] Stearic acid-modified nano calcium carbonate: an appropriate amount of nano calcium carbonate and 2-5% by mass of stearic acid are weighed, the nano calcium carbonate is dissolved in anhydrous ethanol, and ultrasonic dispersion is performed for 30 min to prepare a nano calcium carbonate / ethanol suspension; a mixture of stearic acid and anhydrous ethanol is prepared at a volume ratio of 1-100, ultrasonic dispersion is performed at 45°C for 30 min to fully dissolve the stearic acid, and a stearic acid / ethanol solution is prepared; the nano calcium carbonate / ethanol suspension and the stearic acid / ethanol solution are mixed in a three-necked flask, stirring is performed at 60°C for 2 h, and filtration is performed; drying is performed in a vacuum drying oven at 100°C, and grinding is performed to prepare the stearic acid-modified nano calcium carbonate.

[0044] Antioxidant: RIANOX-1098, Tianjin Li'anlong New Material Co., Ltd.

[0045] The proportions of the components of the raw materials in Examples 1-3 and Comparative Examples 1-5 of the present application are shown in Table 1 below:

[0046] Table 1 Proportions of components of raw materials

[0047]

[0048] The proportions of the formulations provided in Examples 1-3 and Comparative Examples 1-5 above were used to prepare PA5T / 56 composite materials according to the following experimental procedure:

[0049] (1) The components of the raw materials were weighed according to the respective formulation proportions of the examples and comparative examples, wherein the PA5T / 56 resin was dried at 120°C for 2h before weighing;

[0050] (2) The weighed PA5T / 56 resin, silane-modified nano-carbon black, stearic acid-modified nano-calcium carbonate and antioxidant were pre-mixed to obtain an initial mixture;

[0051] (3) The initial mixture was fed into the main hopper of a twin-screw extruder, transported by its own gravity and the screw of the first feeding zone of the extruder, while the glass fibers were added to the hopper of the side feeder, transported into the screw cavity of the extruder by the screw of the side feeder, and then heated, melted and extruded by the heating cylinder and the screw shearing, wherein the processing temperature of the twin-screw extruder was controlled at 300-325°C, and the main machine speed was 370-430 rpm, to finally obtain the PA5T / 56 material.

[0052] The PA5T / 56 composite materials prepared in Examples 1-3 and Comparative Examples 1-5 were subjected to performance testing, and the test results are shown in Table 2 below:

[0053] Table 2 Test results

[0054]

[0055] From the experimental data, it can be seen that the antistatic flame-retardant PA5T / 56 composite material in the embodiments 1-3 of the application is developed by different proportions of PA5T / 56 resin, glass fiber, silane modified nano carbon black, stearic acid modified nano calcium carbonate and antioxidant. The nano carbon black is a functional filler with heat resistance, flame retardance and conductivity. There are free electrons inside and polymerization inhibitor groups on the surface. After the surface modification of the nano carbon black by the silane coupling agent, the nano carbon black is uniformly dispersed in the PA5T / 56 matrix, and the particles contact with each other to form a three-dimensional conductive network, which provides a migration channel for static electricity, avoids the accumulation of static electricity and effectively improves the conductivity. At the same time, a dense carbon layer is formed on the surface of the polymer during the combustion process, which forms a protective layer, inhibits the release of smoke, reduces the exchange of oxygen and improves the flame retardance of the material. The nano calcium carbonate has a unique crystal structure and surface electronic structure. After the surface modification of the nano calcium carbonate by stearic acid, the nano calcium carbonate is uniformly dispersed in the PA5T / 56 matrix, which can improve the moisture absorption and ionic conductivity. At the same time, calcium oxide and water vapor are generated by the decomposition of calcium carbonate at high temperature, and the calcium oxide on the surface of the material also has a barrier effect. The water vapor can not only dilute the concentration of flammable gas, but also play a flame-retardant role in the condensed phase. The combination of silane modified nano carbon black and stearic acid modified nano calcium carbonate has a synergistic effect, which can effectively improve the antistatic property and flame retardance of the PA5T / 56 material. The glass fiber is used as a reinforcing material to transfer the load and disperse the stress through the interface bonding between the glass fiber and the PA5T / 56 matrix, thereby improving the rigidity of the material. In addition, the thermal stability of the composite material can be improved by adding the antioxidant. The antistatic flame-retardant PA5T / 56 material of the application has balanced rigidity, antistatic property and flame retardance, and can be used in electronic component products with high strength, antistatic property and flame retardance.

[0056] Finally, it should be noted that the terms "comprising", "including", or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article or apparatus.

[0057] Although the preferred embodiments of the application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to cover the preferred embodiments and all changes and modifications falling within the scope of the application.

[0058] Obviously, those skilled in the art can make various modifications and variations to the application without departing from the spirit and scope of the application. Thus, if these modifications and variations of the application fall within the scope of the claims of the application and their equivalent technologies, the application also intends to include these modifications and variations.

Claims

1. An antistatic flame retardant PA5T / 56 composite material, characterized in that, The composite material comprises the following components in percentage by mass: PA5T / 56 resin 45%-60%, glass fiber 20%-30%, silane modified nano carbon black 10%-15%, stearic acid modified nano calcium carbonate 5%-10%, and antioxidant 0.5%-2%; The preparation method of the silane modified nano carbon black comprises the following steps: placing nano carbon black in isopropyl alcohol, and performing ultrasonic dispersion to obtain a nano carbon black / isopropyl alcohol suspension; dissolving a silane coupling agent in anhydrous ethanol, and performing ultrasonic dispersion to obtain a silane coupling agent / ethanol mixed solution; placing the nano carbon black / isopropyl alcohol suspension and the silane coupling agent / ethanol mixed solution in a three-necked flask, and stirring at 90-100 DEG C for 4-6 h to obtain a reaction liquid; and filtering, washing and drying the reaction liquid to obtain the silane modified nano carbon black. The volume ratio of the silane coupling agent to the anhydrous ethanol is 1:100-2:100; and the addition amount of the silane coupling agent is 10-20% of the mass of the nano carbon black.

2. The antistatic flame retardant PA5T / 56 composite material according to claim 1, characterized in that, The glass fiber is a short-cut glass fiber subjected to surface treatment.

3. The antistatic flame retardant PA5T / 56 composite material according to claim 1, characterized in that, The preparation method of the stearic acid modified nano calcium carbonate comprises the following steps: placing nano calcium carbonate in anhydrous ethanol, and performing ultrasonic dispersion to obtain a nano calcium carbonate / ethanol suspension; ultrasonically dispersing stearic acid and anhydrous ethanol in a volume ratio of 1:100-5:100 at 45-50 DEG C, and fully dissolving to obtain a stearic acid / ethanol solution; placing the nano calcium carbonate / ethanol suspension and the stearic acid / ethanol solution in a three-necked flask, and stirring at 60-80 DEG C for 1-2 h to obtain a reaction liquid; and filtering, washing, drying and grinding the reaction liquid to obtain the stearic acid modified nano calcium carbonate.

4. The antistatic flame retardant PA5T / 56 composite material according to claim 3, characterized in that, The addition amount of the stearic acid is 2-5% of the mass of the nano calcium carbonate.

5. The antistatic flame retardant PA5T / 56 composite material according to claim 1, characterized in that, The antioxidant is N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine.

6. A process for the preparation of an antistatic flame retardant PA5T / 56 composite material, characterized in that, The preparation method comprises: preparing silane modified nano carbon black; preparing stearic acid modified nano calcium carbonate; weighing each component of a composite material raw material, wherein the raw material components comprise: PA5T / 56 resin 45%-60%, glass fiber 20%-30%, silane modified nano carbon black 10%-15%, stearic acid modified nano calcium carbonate 5%-10%, and antioxidant 0.5%-2%; premixing the PA5T / 56 resin, the silane modified nano carbon black, the stearic acid modified nano calcium carbonate and the antioxidant to obtain an initial mixture; adding the initial mixture from a main feeding hopper into the screw cavity of a double screw extruder, and adding the glass fiber from a side feeding hopper into the screw cavity of the double screw extruder, and then performing heating melting, extruding and granulating to obtain an antistatic flame-retardant PA5T / 56 composite material; the preparation of the silane modified nano carbon black specifically comprises: respectively weighing nano carbon black and a silane coupling agent with a mass fraction of 10-20%; placing the nano carbon black in isopropyl alcohol, and performing ultrasonic dispersion to obtain a nano carbon black / isopropyl alcohol suspension; The silane coupling agent and anhydrous ethanol with a volume ratio of 1:100-2:100 are ultrasonically dispersed to obtain a silane coupling agent / ethanol mixed solution; The nanometer carbon black / isopropyl alcohol suspension and the silane coupling agent / ethanol mixed solution are placed in a three-necked flask and stirred at 90-100℃ for 4-6h to obtain a reaction liquid; The reaction liquid is filtered and washed to obtain a filter cake; The filter cake is placed in a vacuum drying oven at 100℃ for drying to obtain silane-modified nanometer carbon black.

7. The process for the preparation of an antistatic flame retardant PA5T / 56 composite according to claim 6, characterized in that, The preparation of the stearic acid-modified nanometer calcium carbonate specifically comprises: Nanometer calcium carbonate and stearic acid with a mass fraction of 2-5% are weighed respectively; The nanometer calcium carbonate is placed in anhydrous ethanol and ultrasonically dispersed to obtain a nanometer calcium carbonate / ethanol suspension; The stearic acid and anhydrous ethanol with a volume ratio of 1:100-5:100 are ultrasonically dispersed and fully dissolved at 45-50℃ to obtain a stearic acid / ethanol solution; The nanometer calcium carbonate / ethanol suspension and the stearic acid / ethanol solution are placed in a three-necked flask and stirred at 60-80℃ for 1-2h to obtain a reaction liquid; The reaction liquid is filtered and washed to obtain a filter cake; The filter cake is placed in a vacuum drying oven at 100℃ for drying, and after grinding, stearic acid-modified nanometer calcium carbonate is obtained.

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