Process for the production of an antistatic nonwoven fabric

Abstract

The application discloses a preparation method of an antistatic non-woven fabric and belongs to the technical field of non-woven fabrics. The preparation method comprises the following raw materials in parts by weight: 80-90 parts of polypropylene, 6-12 parts of an antistatic agent, 2-4 parts of a compatilizer and 0.3-0.6 parts of an antioxidant. The self-made PEBA is used as the antistatic agent, a conductive layer can be formed on the surface of the non-woven fabric, the antistatic performance of the non-woven fabric is greatly improved, and the non-woven fabric has high durability. The functional groups are introduced into the structure of the antistatic agent, the antistatic performance of the non-woven fabric is further improved, the heat aging resistance of the non-woven fabric is also enhanced, the non-woven fabric can be applied to high-temperature environments such as reflow soldering and server interiors, the antistatic agent is combined with the polypropylene matrix through a melt blending mode, compared with a traditional surface coating method, the antistatic agent is more firmly combined with the fibers and is not easy to fall off, and the non-woven fabric prepared by the application has both antistatic and heat aging resistance, and is particularly suitable for high-demand application scenarios in the electronic information field.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of non-woven fabrics, and particularly relates to a preparation method of an antistatic non-woven fabric. BACKGROUND

[0002] As a fabric formed without spinning and weaving, the non-woven fabric has been widely applied in the electronic information field due to its light weight, air permeability, softness, high production efficiency and low cost, etc. In the electronic information field, the non-woven fabric is often used as a packaging material of electronic components, a dust cover and an insulating liner of a circuit board, etc. However, with the continuous expansion of the application scenarios of the non-woven fabric, the influence of static electricity on the use performance and safety of the non-woven fabric is increasingly prominent, which has become a key bottleneck restricting the further application of the non-woven fabric in the electronic information field.

[0003] The generation of static electricity is caused by the frequent behaviors of friction, peeling or contact separation of the non-woven fabric fiber material in the production, processing and use process, resulting in a large accumulation of electric charges on the surface of the fiber. In the electronic information field, the accumulated static electricity is easy to break through the insulating layer of the precision electronic components, causing damage to the components, performance failure, and even triggering the failure of the entire electronic device, which brings huge economic losses to enterprises. Therefore, it has become an important demand of the current non-woven fabric industry to modify the non-woven fabric to have stable and durable antistatic performance.

[0004] At present, the antistatic modification of the non-woven fabric in the industry is mainly the surface coating method. This method dissolves or disperses the antistatic agent (such as a cationic antistatic agent, an anionic antistatic agent or a non-ionic antistatic agent) in water, ethanol or other solvents, then coats the antistatic agent on the surface of the non-woven fabric by spraying, padding, brushing or other methods, and then performs drying treatment to make the antistatic agent adhere to the surface of the fiber to form an antistatic film. The advantage of the surface coating method is that the operation is simple, the cost is relatively low, and the antistatic effect of the non-woven fabric can be quickly realized. Therefore, the method is widely used in some low-end fields which are sensitive to cost and have low requirements for antistatic performance. However, the shortcomings of this method are also very prominent: the antistatic agent is only attached to the surface of the fiber, and the bonding force with the fiber is weak. During the subsequent washing, friction, bending or long-term use, the antistatic agent is easy to fall off and migrate, resulting in rapid decay or even complete loss of the antistatic performance, and the durability is extremely poor. At the same time, part of the antistatic agent may also affect the mechanical properties of the fiber, resulting in a decrease in the strength and tear resistance of the non-woven fabric.

[0005] In addition, the production and use environment of the electronic information field has a significant high-temperature feature: the reflow soldering temperature in the chip packaging process can reach 150-260℃, the internal local temperature of the server will increase significantly during long-term operation, and the electronic components are often subjected to high-temperature fluctuations during storage and transportation, resulting in thermal aging of the non-woven fabric. Therefore, it is urgent to solve the above problems to meet the application of the non-woven fabric in higher technology. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for preparing antistatic nonwoven fabric.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A method for preparing an antistatic nonwoven fabric includes the following steps:

[0009] A1. Add the four raw materials—polypropylene, antistatic agent, compatibilizer, and antioxidant—to a high-speed mixer and stir and mix them at room temperature for 15-20 minutes to ensure that the components are initially mixed evenly, thus obtaining a mixture.

[0010] A2. The mixture is sent to a vacuum drying oven for drying to remove moisture from the raw materials and prevent hydrolysis and degradation during the subsequent high-temperature melting process, which could cause the spinning ends to break or bubbles to be generated, affecting the quality, and thus obtaining a dried mixture.

[0011] A3. The dry mixture is fed into the screw extruder through an automatic feeding system for melt blending. The material is fully melted, plasticized and mixed evenly under the shearing and conveying of the screw to form a uniform melt. After being extruded through a spinneret and cooled by air, nascent fibers are obtained.

[0012] A4. The nascent fibers are drawn in a drawing machine at a drawing ratio of 3-5 times to obtain antistatic fibers, and then fed into an air-flow web forming machine. The fibers are randomly and evenly distributed by airflow disturbance to form a fiber web.

[0013] A5. The fiber web is fed into a hot rolling mill for reinforcement, and finally cooled and shaped by cooling rollers, then cut and wound up to obtain antistatic nonwoven fabric.

[0014] Preferably, the drying temperature is 80-85℃ and the drying time is 4-8h.

[0015] Preferably, the temperature settings for each zone of the screw extruder are as follows: Zone 1: 180-190℃, Zone 2: 200-210℃, Zone 3: 220-230℃, Zone 4: 230-240℃, and Die head temperature: 235-245℃.

[0016] Preferably, the air temperature for the air-cooled cooling is 25-30℃ and the air speed is 0.5-1.0m / s.

[0017] Preferably, the hot rolling mill has a roll temperature of 120-140℃, a hot rolling pressure of 0.3-0.5MPa, and a hot rolling time of 5-10s.

[0018] Preferably, the temperature of the cooling roller is 20-30°C.

[0019] Preferably, the raw materials are as follows by weight: 80-90 parts polypropylene, 6-12 parts antistatic agent, 2-4 parts compatibilizer and 0.3-0.6 parts antioxidant.

[0020] Preferably, the antioxidant is one of antioxidant 1098, antioxidant 3114 and antioxidant 1010.

[0021] Preferably, the compatibilizer is maleic anhydride-grafted polypropylene.

[0022] Preferably, the antistatic agent is prepared by the following steps:

[0023] B1. Add 3,5-dibromo-1,2,4-triazole, sodium p-hydroxybenzenesulfonate, anhydrous potassium carbonate, and anhydrous N,N-dimethylformamide sequentially to a dry round-bottom flask. Install a reflux condenser, turn on the stirrer, heat to 80-85℃, and stir the reaction at this temperature for 6-8 hours. After the reaction is complete, perform post-processing to obtain product A.

[0024] B2. Add product A and 1,3-propanediamine sequentially to a dry round-bottom flask, install a reflux condenser, turn on the stirrer, heat to 90-100℃, and stir the reaction at this temperature for 10-12 hours. After the reaction is complete, perform post-processing to obtain product B.

[0025] B3. In a stainless steel reactor, add caprolactam, sebacic acid, 6-aminocaproic acid, product B, polyethylene glycol, and tetrabutyl titanate in sequence. Purge the air in the reactor with nitrogen gas, then heat to 230-240℃ and maintain the reaction temperature for 5-6 hours under nitrogen atmosphere. Then, evacuate the reactor for 2 hours to complete the reaction. After post-processing, obtain the antistatic agent.

[0026] Preferably, in step B1, the ratio of the amounts of 3,5-dibromo-1,2,4-triazole, sodium p-hydroxybenzenesulfonate, anhydrous potassium carbonate, and anhydrous N,N-dimethylformamide is 24.4-25.3 g: 19.6 g: 14.2-14.8 g: 120-150 mL.

[0027] Preferably, the ratio of product A to 1,3-propanediamine in step B2 is 34.2 g: 60-80 mL.

[0028] Preferably, in step B3, the ratio of caprolactam, sebacic acid, 6-aminocaproic acid, product B, polyethylene glycol, and tetrabutyl titanate is 200g:21.7-23.5g:9g:3.5-4.1g:120g:3mL.

[0029] In the above process of preparing the antistatic agent, the reaction formulas for steps B1 and B2 are as follows:

[0030]

[0031] In the preparation process of this invention, in order to accurately prepare product B with the above-described structure, it is necessary to strictly control the amount of raw materials in each step. In step B1, 3,5-dibromo-1,2,4-triazole undergoes a nucleophilic substitution reaction with sodium p-hydroxybenzenesulfonate, controlling the molar ratio of the two to be close to 1:1, with the former in excess. Furthermore, the bromine atom at the C5 position of the 3,5-dibromo-1,2,4-triazole molecule is more reactive and participates in the reaction first, reserving the bromine atom at the C3 position for the reaction in step B2. In step B2, product A undergoes a nucleophilic substitution reaction with 1,3-propanediamine, controlling the molar ratio of the two to be close to 1:1, with the latter in excess. 3-Propanediamine is used as both a reactant and a solvent to reduce side reactions, yielding product B. In step B3, 6-aminohexanoic acid initiates the ring-opening polymerization of the monomer caprolactam to generate a polyamide 6 oligomer with a carboxyl group at one end and an amino group at the other. Then, sebacic acid converts the terminal amino group of the polyamide 6 oligomer and the amino group at one end of product B into a carboxyl group through a condensation reaction. Under the catalysis of tetrabutyl titanate, the polyamide 6 oligomer with carboxyl groups at both ends undergoes an esterification reaction with PEG with hydroxyl groups at both ends. Product B, which contains carboxyl groups, can also participate in the reaction, ultimately yielding a polyether amide block copolymer (PEBA).

[0032] Polyether amide block copolymers are high-molecular permanent antistatic agents that can form a conductive surface layer with a ribbed or layered distribution on the substrate. Compared with traditional antistatic agents, they mainly achieve antistatic effects by reducing the resistivity of the material. They are not affected by environmental humidity, have a long-lasting antistatic effect, and have no induction period. In this invention, a self-made product B is introduced into the copolymer. Product B contains a benzene ring and a triazole ring. The benzene ring can disperse heat energy through the conjugation effect, and the triazole ring can form stronger intermolecular forces due to the introduction of heteroatoms, further restricting chain segment movement. The two can play a synergistic role, which greatly enhances the heat resistance of the matrix. Finally, a sulfonate group is also introduced at one end of product B, which further improves the antistatic properties of the matrix and has better heat resistance than quaternary ammonium salt antistatic agents.

[0033] The beneficial effects of this invention are:

[0034] Advantage 1: This invention uses self-made PEBA as an antistatic agent, which can form a conductive layer on the surface of non-woven fabric, greatly improving the antistatic performance of non-woven fabric and making it highly durable.

[0035] Advantage 2: Introducing functional groups into the structure of the antistatic agent not only further improves the antistatic properties of the nonwoven fabric, but also enhances its heat aging resistance, enabling the nonwoven fabric to be used in high-temperature environments such as reflow soldering and server interiors.

[0036] Advantage 3: The antistatic agent is combined with the polypropylene matrix through melt blending. Compared with the traditional surface coating method, the antistatic agent is more firmly bonded to the fiber and is not easy to fall off.

[0037] In summary, the nonwoven fabric prepared by this invention has both antistatic and heat aging resistance properties, making it particularly suitable for demanding applications in the field of electronic information. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1

[0040] Preparation of antistatic agents:

[0041] B1. Add 24.4g of 3,5-dibromo-1,2,4-triazole, 19.6g of sodium p-hydroxybenzenesulfonate, 14.2g of anhydrous potassium carbonate, and 120mL of anhydrous N,N-dimethylformamide sequentially to a dry round-bottom flask. Install a reflux condenser, turn on the stirrer, heat to 80°C, and stir the reaction at this temperature for 6 hours. After the reaction is complete, stop heating, cool the reaction solution to room temperature, add it to ice-cold acetone, filter, collect the solid product, add deionized water, stir to completely dissolve it, and slowly add concentrated hydrochloric acid dropwise to the aqueous solution under ice-water bath cooling and stirring until pH≈3. At this point, a precipitate will precipitate. Filter again, wash with ice water, and dry to obtain product A.

[0042] B2. Add 34.2 g of product A and 60 mL of 1,3-propanediamine to a dry round-bottom flask, install a reflux condenser, turn on the stirrer, heat to 90 °C, and stir the reaction at this temperature for 10 h. After the reaction is complete, stop heating, cool the reaction solution to room temperature, evaporate by rotary evaporation, add anhydrous ethanol, stir and wash thoroughly, then pour into acetone, and let stand for aging under ice bath conditions to allow the solid to precipitate completely. Filter and dry to obtain product B.

[0043] B3. In a stainless steel reactor, add 200g caprolactam (produced by Wuhan Yuancheng Gongchuang Technology Co., Ltd.), 21.7g sebacic acid, 9g 6-aminocaproic acid, 3.5g product B, 120g polyethylene glycol (molecular weight 1000) and 3mL tetrabutyl titanate in sequence. Purge the air in the reactor with nitrogen, then heat to 230℃ and keep the reaction at this temperature for 5 hours under nitrogen atmosphere. Then, vacuum the reactor for 2 hours. After the reaction is complete, cool down, take out the crude product, crush it, and wash it with ethanol aqueous solution to remove small molecules. Then dissolve and wash it with dilute hydrochloric acid (mass fraction 2%), filter it, and finally vacuum dry it to obtain the antistatic agent.

[0044] A method for preparing an antistatic nonwoven fabric includes the following steps:

[0045] A1. Add 80 parts of polypropylene, 6 parts of antistatic agent, 2 parts of maleic anhydride grafted polypropylene and 0.3 parts of antioxidant 1098 to a high-speed mixer and stir and mix at room temperature for 15 minutes to ensure that the components are initially mixed evenly to obtain a mixture.

[0046] A2. The mixture is placed in a vacuum drying oven and dried at 80°C for 4 hours to remove moisture from the raw materials and prevent hydrolysis and degradation during the subsequent high-temperature melting process, which could cause the spinning ends to break or bubbles to be generated, affecting the quality, and thus obtaining a dried mixture.

[0047] A3. The dried mixture is fed into a screw extruder via an automatic feeding system (the temperature settings of each zone of the screw extruder are as follows: Zone 1: 180℃, Zone 2: 200℃, Zone 3: 220℃, Zone 4: 230℃, Die head temperature: 235℃) for melt blending. Under the shearing and conveying of the screw, the material is fully melted, plasticized and mixed evenly to form a uniform melt. The melt is then extruded through a spinneret and cooled by air (air temperature is 25℃, air velocity is 0.5m / s) to obtain nascent fibers.

[0048] A4. The nascent fibers are drawn in a drawing machine at a drawing ratio of 3 to obtain antistatic fibers, and then fed into an airflow web forming machine. The fibers are randomly and evenly distributed by airflow disturbance to form a fiber web.

[0049] A5. The fiber web is fed into a hot rolling mill (roller temperature 120℃, hot rolling pressure 0.3MPa, hot rolling time 5s) for reinforcement, and finally cooled and shaped by a cooling roller (roller temperature 20℃), then cut and wound to obtain antistatic nonwoven fabric.

[0050] Example 2

[0051] Preparation of antistatic agents:

[0052] B1. Add 25.3g of 3,5-dibromo-1,2,4-triazole, 19.6g of sodium p-hydroxybenzenesulfonate, 14.8g of anhydrous potassium carbonate, and 150mL of anhydrous N,N-dimethylformamide sequentially to a dry round-bottom flask. Install a reflux condenser, turn on the stirrer, heat to 85°C, and stir the reaction at this temperature for 8 hours. After the reaction is complete, stop heating, cool the reaction solution to room temperature, add it to ice-cold acetone, filter, collect the solid product, add deionized water, stir to completely dissolve it, and slowly add concentrated hydrochloric acid dropwise to the aqueous solution while cooling and stirring in an ice-water bath until pH≈3. At this point, a precipitate will precipitate. Filter again, wash with ice water, and dry to obtain product A.

[0053] B2. Add 34.2 g of product A and 80 mL of 1,3-propanediamine to a dry round-bottom flask, install a reflux condenser, turn on the stirrer, heat to 100 °C, and stir the reaction at this temperature for 12 h. After the reaction is complete, stop heating, cool the reaction solution to room temperature, evaporate by rotary evaporation, add anhydrous ethanol, stir and wash thoroughly, then pour into acetone, and let stand for aging under ice bath conditions to allow the solid to precipitate completely. Filter and dry to obtain product B.

[0054] B3. In a stainless steel reactor, add 200g caprolactam (produced by Wuhan Yuancheng Gongchuang Technology Co., Ltd.), 23.5g sebacic acid, 9g 6-aminocaproic acid, 4.1g product B, 120g polyethylene glycol (molecular weight 1000) and 3mL tetrabutyl titanate in sequence. Purge the air in the reactor with nitrogen, then heat to 240℃ and keep the reaction at this temperature for 6 hours under nitrogen atmosphere. After that, vacuum the reactor for 2 hours. Once the reaction is complete, cool down, remove the crude product, crush it, and wash it with an ethanol aqueous solution to remove small molecules. Then dissolve and wash it with dilute hydrochloric acid (2% by mass), filter it, and finally vacuum dry it to obtain the antistatic agent.

[0055] A method for preparing an antistatic nonwoven fabric includes the following steps:

[0056] A1. Add 85 parts of polypropylene, 9 parts of antistatic agent, 3 parts of maleic anhydride grafted polypropylene and 0.5 parts of antioxidant 3114 to a high-speed mixer and stir and mix at room temperature for 20 minutes to ensure that the components are initially mixed evenly to obtain a mixture.

[0057] A2. The mixture is placed in a vacuum drying oven and dried at 85°C for 6 hours to remove moisture from the raw materials and prevent hydrolysis and degradation during the subsequent high-temperature melting process, which could cause the spinning ends to break or bubbles to be generated, affecting the quality, and thus obtaining a dried mixture.

[0058] A3. The dried mixture is fed into a screw extruder via an automatic feeding system (the temperature settings of each zone of the screw extruder are as follows: Zone 1: 190℃, Zone 2: 210℃, Zone 3: 230℃, Zone 4: 240℃, Die head temperature: 245℃) for melt blending. Under the shearing and conveying of the screw, the material is fully melted, plasticized and mixed evenly to form a uniform melt. The melt is then extruded through a spinneret and cooled by air (air temperature is 30℃, air speed is 1.0m / s) to obtain nascent fibers.

[0059] A4. The nascent fibers are drawn in a drawing machine at a drawing ratio of 4 to obtain antistatic fibers, and then fed into an airflow web forming machine. The fibers are randomly and evenly distributed by airflow disturbance to form a fiber web.

[0060] A5. The fiber web is fed into a hot rolling mill (roller temperature 130℃, hot rolling pressure 0.4MPa, hot rolling time 10s) for reinforcement, and finally cooled and shaped by a cooling roller (roller temperature 30℃), then cut and wound to obtain antistatic nonwoven fabric.

[0061] Example 3

[0062] The only difference between this embodiment and Embodiment 2 is that, in this embodiment, a method for preparing an antistatic nonwoven fabric includes the following steps:

[0063] A1. Add 90 parts of polypropylene, 12 parts of antistatic agent, 4 parts of maleic anhydride grafted polypropylene and 0.6 parts of antioxidant 1010 to a high-speed mixer and stir at room temperature for 20 minutes to ensure that the components are initially mixed evenly to obtain a mixture.

[0064] A2. The mixture is placed in a vacuum drying oven and dried at 85°C for 8 hours to remove moisture from the raw materials and prevent hydrolysis and degradation during the subsequent high-temperature melting process, which could cause the spinning ends to break or bubbles to be generated, affecting the quality, and thus obtain a dried mixture.

[0065] A3. The dried mixture is fed into a screw extruder via an automatic feeding system (the temperature settings of each zone of the screw extruder are as follows: Zone 1: 190℃, Zone 2: 210℃, Zone 3: 230℃, Zone 4: 240℃, Die head temperature: 245℃) for melt blending. Under the shearing and conveying of the screw, the material is fully melted, plasticized and mixed evenly to form a uniform melt. The melt is then extruded through a spinneret and cooled by air (air temperature is 30℃, air speed is 1.0m / s) to obtain nascent fibers.

[0066] A4. The nascent fibers are drawn in a drawing machine at a drawing ratio of 5 to obtain antistatic fibers, and then fed into an airflow web forming machine. The fibers are randomly and evenly distributed by airflow disturbance to form a fiber web.

[0067] A5. The fiber web is fed into a hot rolling mill (roller temperature 140℃, hot rolling pressure 0.5MPa, hot rolling time 10s) for reinforcement, and finally cooled and shaped by a cooling roller (roller temperature 30℃), then cut and wound to obtain antistatic nonwoven fabric.

[0068] Comparative Example 1

[0069] The only difference between this comparative example and Example 3 is that in this comparative example, an equal amount of antistatic agent SN is used to replace the antistatic agent in order to obtain nonwoven fabric.

[0070] Comparative Example 2

[0071] The only difference between this comparative example and Example 3 is that no antistatic agent was added in this comparative example to obtain the nonwoven fabric.

[0072] The following performance tests were performed on Examples 1, 2, and 3, and Comparative Examples 1 and 2:

[0073] The resistivity of the nonwoven fabric surface was measured using a high-resistivity meter in accordance with the GB / T 1410-2006 standard.

[0074] Using the GB / T 7141-2008 standard, the nonwoven fabric sample was placed in a high-temperature oven and treated at 150℃ for 168 hours. After removal, the condition of the sample was observed.

[0075] The antistatic performance retention rate of Examples 1, 2, 3 and Comparative Example 1 after 30 washes was determined according to GB / T 8629-2017 standard.

[0076] The measurement results are shown in Table 1:

[0077] Table 1

[0078] Test item Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Surface resistivity (Ω / m) 10 8 ]] 10 8 ]] 10 7 ]] 10 9 ]] 10 13 ]] State after heat aging resistance Good Good Good Yellowing and embrittlement Yellowing and embrittlement Retention rate / % 87.5 87.7 88.3 53.9 /

[0079] As can be seen from the table above, the nonwoven fabric prepared in the embodiments of the present invention has better antistatic and heat resistance properties than the comparative example. Therefore, the present invention is particularly suitable for high-requirement application scenarios in the field of electronic information.

[0080] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A method for preparing an antistatic nonwoven fabric, characterized in that, Includes the following steps: A1. Add polypropylene, antistatic agent, compatibilizer and antioxidant into a mixer and stir and mix at room temperature for 15-20 minutes to obtain a mixture. A2. Dry the mixture to obtain a dried mixture; A3. The dried mixture is fed into a screw extruder for melt blending, extruded through a spinneret, and cooled by air to obtain nascent fibers; A4. The nascent fibers are drawn in a drawing machine to obtain antistatic fibers, and then fed into an air-flow web forming machine to form a fiber web; A5. The fiber web is fed into a hot rolling mill for reinforcement, and finally cooled and shaped by a cooling roller, then cut and rolled up to obtain antistatic nonwoven fabric. The antistatic agent is prepared through the following steps: B1. Add 3,5-dibromo-1,2,4-triazole, sodium p-hydroxybenzenesulfonate, anhydrous potassium carbonate and anhydrous N,N-dimethylformamide sequentially to the flask, start stirring, and react at 80-85℃ for 6-8 hours. When the reaction is complete, product A is obtained. B2. Add product A and 1,3-propanediamine to the flask in sequence, start stirring, and react at 90-100℃ for 10-12 h. When the reaction is complete, product B is obtained. B3. Add caprolactam, sebacic acid, 6-aminocaproic acid, product B, polyethylene glycol and tetrabutyl titanate sequentially to the reaction vessel. Replace the air with nitrogen and keep the reaction at 230-240℃ for 5-6 hours. Then, evacuate the vessel and react for 2 hours. The reaction is complete, and the antistatic agent is obtained.

2. The method for preparing an antistatic nonwoven fabric according to claim 1, characterized in that, In step B1, the ratio of the amounts of 3,5-dibromo-1,2,4-triazole, sodium p-hydroxybenzenesulfonate, anhydrous potassium carbonate, and anhydrous N,N-dimethylformamide is 24.4-25.3 g: 19.6 g: 14.2-14.8 g: 120-150 mL.

3. The method for preparing an antistatic nonwoven fabric according to claim 1, characterized in that, In step B2, the ratio of product A to 1,3-propanediamine is 34.2 g: 60-80 mL.

4. The method for preparing an antistatic nonwoven fabric according to claim 1, characterized in that, In step B3, the ratio of caprolactam, sebacic acid, 6-aminocaproic acid, product B, polyethylene glycol, and tetrabutyl titanate is 200g:21.7-23.5g:9g:3.5-4.1g:120g:3mL.

5. The method for preparing an antistatic nonwoven fabric according to claim 1, characterized in that, The raw materials are as follows by weight: 80-90 parts polypropylene, 6-12 parts antistatic agent, 2-4 parts compatibilizer and 0.3-0.6 parts antioxidant.

6. The method for preparing an antistatic nonwoven fabric according to claim 1, characterized in that, The antioxidant is one of antioxidant 1098, antioxidant 3114 and antioxidant 1010.

7. The method for preparing an antistatic nonwoven fabric according to claim 1, characterized in that, The compatibilizer is maleic anhydride-grafted polypropylene.

8. The method for preparing an antistatic nonwoven fabric according to claim 1, characterized in that, The drying temperature is 80-85℃, and the drying time is 4-8 hours.

9. The method for preparing an antistatic nonwoven fabric according to claim 1, characterized in that, The air temperature for the air-cooled cooling is 25-30℃, and the air speed is 0.5-1.0m / s.