Process for manufacturing an antistatic polyethylene nonwoven fabric

Abstract

The application discloses an anti-static polyethylene non-woven fabric manufacturing process and relates to the technical field of polyethylene non-woven fabrics.The process comprises the following steps: Step 1, raw material preparation: mixing anti-static master batches and polyethylene materials to obtain surface layer mixed materials; Step 2, single-layer preparation: obtaining non-woven fabric surface layers based on the surface layer mixed materials by a spun-bond method and obtaining polyethylene non-woven fabrics based on a flash evaporation method, then sequentially immersing the polyethylene non-woven fabrics in an anti-static solution, taking out and cooling to room temperature, and performing low-temperature drying treatment to obtain anti-static functional layers; Step 3, composite preparation: taking two non-woven fabric surface layers and respectively attaching the two non-woven fabric surface layers to the two sides of the anti-static functional layers, and then performing hot rolling treatment to obtain composite anti-static non-woven fabrics.The application has the effect of solving the problem of static electricity generated by friction while avoiding the influence on mechanical properties; wherein, graphene and its mixed solvents are used to solve the problem of static electricity of polyethylene non-woven fabrics, and the non-woven fabric surface layers effectively avoid the problem of decreased anti-static capacity.

Description

Technical Field

[0001] This application relates to the field of polyethylene nonwoven fabric technology, and in particular to a manufacturing process for antistatic polyethylene nonwoven fabric. Background Technology

[0002] Polyethylene is one of the commonly used raw materials for the production of nonwoven fabrics. Its main molding processes include meltblown method, spunbond method, water / needle punching method and flash steaming method. Among them, meltblown spinning is a spinning method that uses high-speed hot airflow to rapidly stretch and solidify the extruded polymer melt into shape; bonding spinning is a nonwoven fabric obtained by randomly forming a web of short fibers through airflow or by combing the fibers and then mechanically cross-laying and impregnating them, and finally coating and drying them. The products are suitable for thermal insulation wadding, electrical insulation material base fabric, etc.; water / needle punching is a process that uses high-pressure water / steel needles to continuously spray / puncture the fiber web to make the fibers randomly entangled and cohesive. The products are dense and thick and are suitable for geotextiles, carpets, synthetic leather base fabrics, etc.; flash evaporation is a proprietary process technology pioneered by DuPont to prepare polyethylene into nonwoven fabric. It is mainly based on the fact that polyethylene is dissolved in a solvent under high temperature and high pressure to form a polymer spinning solution. After spinning, the solvent in the spinning solution is flashed instantaneously, and the polymer splits and solidifies into ultrafine fiber bundles. Under the action of electrostatics, the fiber bundles form a fiber web, and the fiber web is heated and pressed by hot rolling rollers to form a nonwoven fabric.

[0003] Due to the high insulation properties of polyethylene, a large amount of static electricity is generated when friction occurs, which seriously affects the comfort of using polyethylene materials. The conventional approach to solving the static electricity problem of polyethylene materials is to add graphene or conductive carbon black as antistatic agents to reduce the insulation capacity of the polyethylene materials. However, adding graphene or conductive carbon black as antistatic agents will significantly reduce the mechanical properties of polyethylene materials, thereby affecting their service life and performance. This needs to be improved. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a manufacturing process for antistatic polyethylene nonwoven fabric, so as to solve the problem of static electricity generated by friction while avoiding the impact on mechanical properties. The specific solution is as follows:

[0005] A process for manufacturing antistatic polyethylene nonwoven fabric includes the following steps:

[0006] Step 1, Raw material preparation: Mix the antistatic masterbatch with polyethylene material to obtain the surface layer mixture material;

[0007] Step 2, Single-layer preparation: Non-woven fabric surface layer is obtained by spunbonding based on surface layer mixed material and polyethylene non-woven fabric is obtained by flash evaporation. The polyethylene non-woven fabric is then subjected to antistatic solution impregnation, removal and cooling to room temperature and low temperature drying treatment to obtain antistatic functional layer.

[0008] Step 3, Composite preparation: Take two layers of non-woven fabric surface and attach them to both sides of the antistatic functional layer respectively, and then perform hot rolling treatment to obtain composite antistatic non-woven fabric;

[0009] in:

[0010] The antistatic masterbatch includes calcium fluoride, polyvinyl alcohol, chitosan, hydrofluoric acid, and ferric sulfate.

[0011] The antistatic solution comprises graphene and a mixed solvent.

[0012] Preferably, the antistatic masterbatch is obtained by sequentially mixing and stirring calcium fluoride, polyvinyl alcohol, chitosan, water, hydrofluoric acid and ferric sulfate, heating to 60°C and stirring continuously for 5-12 minutes, and then cooling and drying.

[0013] Preferably, the mass ratio of calcium fluoride, polyvinyl alcohol, chitosan, hydrofluoric acid, and ferric sulfate in the antistatic masterbatch is 1-2:12-16:1-4:30-50:1.3%-1.9%; and the mass fraction of the hydrofluoric acid is 40%.

[0014] Preferably, the calcium fluoride is modified calcium fluoride, which is obtained by chemical vapor deposition of a molten mixture of calcium fluoride and iron oxide in a mass ratio of 2-6:1; the polyvinyl alcohol is modified polyvinyl alcohol with hydroxyl groups grafted and replaced by epoxy resin.

[0015] Preferably, the spunbond method includes feeding the surface layer mixture into a screw extruder for melt extrusion, followed by sequential extrusion through a spinneret, traction, and web formation, wherein the surface layer mixture contains 0.8-8% antistatic masterbatch by mass percentage.

[0016] Preferably, the flash evaporation method involves mixing high-density polyethylene material, trichlorofluoromethane, cis-dichloroethylene, and 1,2-dichloroethane in a mass ratio of 1:2.6-3.5:1.2-1.5:0.2-0.5 to form a spinning solution, and then passing the spinning solution through flash evaporation, web laying, and hot rolling to obtain polyethylene nonwoven fabric.

[0017] Preferably, the flash evaporation method includes adding high-density polyethylene into an autoclave and heating it to 120-125°C, then adding trichlorofluoromethane, cis-dichloroethylene and 1,2-dichloroethane into the autoclave, starting stirring, and then gradually heating it to 210-220°C under nitrogen protection and maintaining stirring for 0.5-2 hours to obtain a spinning solution, and then controlling the flash evaporation temperature to 130-140°C.

[0018] Preferably, the mixed solvent is a dispersant, polyvinylpyrrolidone, and 1-methyl-2-pyrrolidone; the ratio of graphene, dispersant, polyvinylpyrrolidone, and 1-methyl-2-pyrrolidone is 1g:0.01-0.1g:0.05-1ml:48-56ml; and the dispersant is a polyamino cationic peryleneimide graphene dispersant.

[0019] Preferably, the immersion time is less than 15 minutes, the low-temperature drying temperature is 30-38℃, and an ultrasonic vibration antistatic solution is used.

[0020] Preferably, the hot rolling temperature is 100-130℃.

[0021] As can be seen from the above solutions, this application provides a manufacturing process for antistatic polyethylene nonwoven fabric, which has the following beneficial effects:

[0022] 1. The composite antistatic nonwoven fabric prepared by using a multi-layer composite structure solves the static electricity problem caused by the high insulation properties of polyethylene nonwoven fabric by forming graphene and its mixed solvent with high strength attached to the antistatic functional layer. At the same time, the hot-rolled nonwoven fabric surface layer effectively avoids the problem of graphene, which is an effective antistatic component, falling off the polyethylene nonwoven fabric and causing a decrease in antistatic ability.

[0023] 2. The calcium fluoride in the antistatic masterbatch is dissolved in hydrofluoric acid and forms a complex with ferric sulfate. Combined with the mixed adsorption of polyvinyl alcohol and chitosan, an antistatic masterbatch with effective antistatic ability is obtained. The surface layer of the antistatic masterbatch and polyethylene material is then spunbonded to obtain a nonwoven fabric surface layer with effective antistatic ability.

[0024] 3. Modified calcium fluoride is prepared by mixing calcium fluoride and iron oxide to significantly reduce the melting temperature, reduce production difficulty and manufacturing cost, and the modified polyvinyl alcohol effectively reduces the negative impact of the antistatic masterbatch on the water repellency of the nonwoven fabric surface layer.

[0025] 4. A polyethylene nonwoven fabric prepared by mixing high-density polyethylene material, trichlorofluoromethane, cis-dichloroethylene and 1,2-dichloroethane is impregnated with the antistatic components in the antistatic solution to effectively avoid the hydrophilic groups affecting the water repellency of the antistatic functional layer, and to give the antistatic functional layer good mechanical properties.

[0026] 5. By utilizing the electrical conductivity between graphene in the antistatic functional layer and antistatic masterbatch in the nonwoven fabric surface layer, the composite antistatic nonwoven fabric can solve the problem of static electricity generated by friction while avoiding the impact on mechanical properties. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] The following will provide a detailed description of the manufacturing process of the antistatic polyethylene nonwoven fabric of this application.

[0029] A process for manufacturing antistatic polyethylene nonwoven fabric includes the following steps:

[0030] Step 1, Raw material preparation: Mix the antistatic masterbatch with polyethylene material to obtain the surface layer mixture material;

[0031] Step 2, Single-layer preparation: Non-woven fabric surface layer is obtained by spunbonding based on surface layer mixed material and polyethylene non-woven fabric is obtained by flash evaporation. The polyethylene non-woven fabric is then subjected to antistatic solution impregnation, removal and cooling to room temperature and low temperature drying treatment to obtain antistatic functional layer.

[0032] Step 3, Composite preparation: Take two layers of non-woven fabric surface and attach them to both sides of the antistatic functional layer respectively, and then perform hot rolling treatment to obtain composite antistatic non-woven fabric;

[0033] in:

[0034] In step 1, the antistatic masterbatch includes calcium fluoride, polyvinyl alcohol, chitosan, hydrofluoric acid, and ferric sulfate. The antistatic masterbatch is prepared by mixing calcium fluoride, polyvinyl alcohol, chitosan, 40% hydrofluoric acid, and ferric sulfate in a mass ratio of 1-2:12-16:1-4:30-50:1.3%-1.9%, followed by stirring, heating to 60°C and continuously stirring for 5-12 minutes, and then cooling and drying. The polyethylene material is high-density polyethylene and / or low-density polyethylene.

[0035] In step 2, the spunbond process includes feeding the surface layer mixture into a screw extruder for melt extrusion, followed by sequential extrusion through a spinneret, traction, and web formation. The surface layer mixture contains 0.8-8% antistatic masterbatch by mass percentage.

[0036] Meanwhile, the flash evaporation method involves mixing high-density polyethylene material, trichlorofluoromethane, cis-dichloroethylene, and 1,2-dichloroethane in a mass ratio of 1:2.6-3.5:1.2-1.5:0.2-0.5 to form a spinning solution, and then passing the spinning solution through flash evaporation, web laying, and hot rolling to obtain polyethylene nonwoven fabric.

[0037] Specifically, the flash evaporation method involves adding high-density polyethylene into an autoclave and heating it to 120-125°C. Then, trichlorofluoromethane, cis-dichloroethylene, and 1,2-dichloroethane are added to the autoclave. Stirring is started, and the temperature is gradually increased to 210-220°C under nitrogen protection while stirring is maintained for 0.5-2 hours to obtain the spinning solution. The flash evaporation temperature is then controlled at 130-140°C.

[0038] The antistatic solution includes graphene and a mixed solvent.

[0039] The mixed solvent consists of a dispersant, polyvinylpyrrolidone, and 1-methyl-2-pyrrolidone, used in a ratio of 1g:0.01-0.1g:0.05-1ml:48-56ml. Furthermore, the graphene dispersant used in this application is a polyamino cationic peryleneimide graphene dispersant.

[0040] Meanwhile, the impregnation time is less than 15 minutes to avoid affecting the structural integrity of the polyethylene nonwoven fabric, the low-temperature drying temperature is 30-38℃, and ultrasonic vibration antistatic solution is used.

[0041] In step 3, the hot rolling temperature is 100-130℃.

[0042] Example 1

[0043] A process for manufacturing antistatic polyethylene nonwoven fabric includes the following steps:

[0044] Step 1, Raw material preparation: Mix the antistatic masterbatch with polyethylene material to obtain the surface layer mixture material;

[0045] Step 2, Single-layer preparation: Non-woven fabric surface layer is obtained by spunbonding based on surface layer mixed material and polyethylene non-woven fabric is obtained by flash evaporation. The polyethylene non-woven fabric is then subjected to antistatic solution impregnation, removal and cooling to room temperature and low temperature drying treatment to obtain antistatic functional layer.

[0046] Step 3, Composite preparation: Take two layers of non-woven fabric surface and attach them to both sides of the antistatic functional layer respectively, and then perform hot rolling treatment to obtain composite antistatic non-woven fabric;

[0047] in:

[0048] In step 1, the antistatic masterbatch includes calcium fluoride, polyvinyl alcohol, chitosan, hydrofluoric acid, and ferric sulfate. The antistatic masterbatch is prepared by mixing calcium fluoride, polyvinyl alcohol, chitosan, 40% hydrofluoric acid, and ferric sulfate in a mass ratio of 1:12:1:30:1.3%, followed by stirring, heating to 60°C and stirring continuously for 5 minutes, and then cooling and drying. The polyethylene material is high-density polyethylene.

[0049] In step 2, the spunbond process includes feeding the surface layer mixture into a screw extruder for melt extrusion, followed by sequential extrusion through a spinneret, traction, and web formation. The surface layer mixture contains 0.8% antistatic masterbatch by mass. Simultaneously, the flash evaporation process involves mixing high-density polyethylene material, trichlorofluoromethane, cis-dichloroethylene, and 1,2-dichloroethane in a mass ratio of 1:2.6:1.2:0.2 to form a spinning solution. This spinning solution is then subjected to flash evaporation, web formation, and hot rolling to obtain a polyethylene nonwoven fabric.

[0050] Specifically, the flash evaporation method involves adding high-density polyethylene into an autoclave and heating it to 120°C. Then, trichlorofluoromethane, cis-dichloroethylene, and 1,2-dichloroethane are added to the autoclave. Stirring is started, and the temperature is gradually increased to 2100°C under nitrogen protection and stirred for 2 hours to obtain the spinning solution. The flash evaporation temperature is then controlled at 130°C.

[0051] The antistatic solution includes graphene and a mixed solvent.

[0052] The antistatic solution comprises graphene, a dispersant, polyvinylpyrrolidone, and 1-methyl-2-pyrrolidone, in a ratio of 1g:0.01g:0.05ml:48ml. Furthermore, the graphene dispersant used in this application is a polyamino cationic peryleneimide graphene dispersant.

[0053] Meanwhile, the impregnation time is less than 15 minutes to avoid affecting the structural integrity of the polyethylene nonwoven fabric, the low-temperature drying temperature is 30℃, and ultrasonic vibration antistatic solution is used.

[0054] In step 3, the hot rolling temperature is 100°C.

[0055] Example 2

[0056] A process for manufacturing antistatic polyethylene nonwoven fabric includes the following steps:

[0057] Step 1, Raw material preparation: Mix the antistatic masterbatch with polyethylene material to obtain the surface layer mixture material;

[0058] Step 2, Single-layer preparation: Non-woven fabric surface layer is obtained by spunbonding based on surface layer mixed material and polyethylene non-woven fabric is obtained by flash evaporation. The polyethylene non-woven fabric is then subjected to antistatic solution impregnation, removal and cooling to room temperature and low temperature drying treatment to obtain antistatic functional layer.

[0059] Step 3, Composite preparation: Take two layers of non-woven fabric surface and attach them to both sides of the antistatic functional layer respectively, and then perform hot rolling treatment to obtain composite antistatic non-woven fabric;

[0060] in:

[0061] In step 1, the antistatic masterbatch includes calcium fluoride, polyvinyl alcohol, chitosan, hydrofluoric acid, and ferric sulfate. The antistatic masterbatch is prepared by mixing calcium fluoride, polyvinyl alcohol, chitosan, 40% hydrofluoric acid, and ferric sulfate in a mass ratio of 1.5:14:3:40:1.6%, followed by stirring, heating to 60°C and stirring continuously for 8 minutes, and then cooling and drying. The polyethylene material is high-density polyethylene and low-density polyethylene in a mass ratio of 1:1.

[0062] In step 2, the spunbond process includes feeding the surface layer mixture into a screw extruder for melt extrusion, followed by sequential extrusion through a spinneret, traction, and web formation. The surface layer mixture contains 5% antistatic masterbatch by mass. Simultaneously, the flash evaporation process involves mixing high-density polyethylene material, trichlorofluoromethane, cis-dichloroethylene, and 1,2-dichloroethane in a mass ratio of 1:3.1:1.3:0.3 to form a spinning solution. This spinning solution is then subjected to flash evaporation, web formation, and hot rolling to obtain a polyethylene nonwoven fabric.

[0063] Specifically, the flash evaporation method involves adding high-density polyethylene into an autoclave and heating it to 123°C. Then, trichlorofluoromethane, cis-dichloroethylene, and 1,2-dichloroethane are added to the autoclave. Stirring is started, and the temperature is gradually increased to 215°C under nitrogen protection while stirring is maintained for 1.5 hours to obtain the spinning solution. The flash evaporation temperature is then controlled at 135°C.

[0064] The antistatic solution includes graphene and a mixed solvent.

[0065] The antistatic solution comprises graphene, a dispersant, polyvinylpyrrolidone, and 1-methyl-2-pyrrolidone, in a ratio of 1g:0.05g:0.5ml:50ml. Furthermore, the graphene dispersant used in this application is a polyamino cationic peryleneimide graphene dispersant.

[0066] Meanwhile, the impregnation time is less than 15 minutes to avoid affecting the structural integrity of the polyethylene nonwoven fabric, the low-temperature drying temperature is 35℃, and ultrasonic vibration antistatic solution is used.

[0067] In step 3, the hot rolling temperature is 120°C.

[0068] Example 3

[0069] A process for manufacturing antistatic polyethylene nonwoven fabric includes the following steps:

[0070] Step 1, Raw material preparation: Mix the antistatic masterbatch with polyethylene material to obtain the surface layer mixture material;

[0071] Step 2, Single-layer preparation: Non-woven fabric surface layer is obtained by spunbonding based on surface layer mixed material and polyethylene non-woven fabric is obtained by flash evaporation. The polyethylene non-woven fabric is then subjected to antistatic solution impregnation, removal and cooling to room temperature and low temperature drying treatment to obtain antistatic functional layer.

[0072] Step 3, Composite preparation: Take two layers of non-woven fabric surface and attach them to both sides of the antistatic functional layer respectively, and then perform hot rolling treatment to obtain composite antistatic non-woven fabric;

[0073] in:

[0074] In step 1, the antistatic masterbatch includes calcium fluoride, polyvinyl alcohol, chitosan, hydrofluoric acid, and ferric sulfate. The antistatic masterbatch is prepared by mixing calcium fluoride, polyvinyl alcohol, chitosan, 40% hydrofluoric acid, and ferric sulfate in a mass ratio of 2:16:4:50:1.9%, followed by stirring, heating to 60°C and stirring continuously for 12 minutes, and then cooling and drying. The polyethylene material is low-density polyethylene.

[0075] In step 2, the spunbond process includes feeding the surface layer mixture into a screw extruder for melt extrusion, followed by sequential extrusion through a spinneret, traction, and web formation. The surface layer mixture contains 8% antistatic masterbatch by mass. Simultaneously, the flash spinning process involves mixing high-density polyethylene material, trichlorofluoromethane, cis-dichloroethylene, and 1,2-dichloroethane in a mass ratio of 1:3.5:1.5:0.5 to form a spinning solution. This spinning solution is then subjected to flash spinning, web formation, and hot rolling to obtain a polyethylene nonwoven fabric.

[0076] Specifically, the flash evaporation method involves adding high-density polyethylene into an autoclave and heating it to 125°C. Then, trichlorofluoromethane, cis-dichloroethylene, and 1,2-dichloroethane are added to the autoclave. Stirring is started, and the temperature is gradually increased to 220°C under nitrogen protection while stirring is maintained for 0.5 hours to obtain the spinning solution. The flash evaporation temperature is then controlled at 140°C.

[0077] The antistatic solution includes graphene and a mixed solvent.

[0078] The antistatic solution comprises graphene, a dispersant, polyvinylpyrrolidone, and 1-methyl-2-pyrrolidone, in a ratio of 1g:0.1g:1ml:56ml. Furthermore, the graphene dispersant used in this application is a polyamino cationic peryleneimide graphene dispersant.

[0079] Meanwhile, the impregnation time is less than 15 minutes to avoid affecting the structural integrity of the polyethylene nonwoven fabric, the low-temperature drying temperature is 38℃, and ultrasonic vibration antistatic solution is used.

[0080] In step 3, the hot rolling temperature is 130°C.

[0081] Example 4

[0082] The difference between Example 4 and Example 2 is that the calcium fluoride in Example 4 is modified calcium fluoride. Modified calcium fluoride is obtained by chemical vapor deposition from a molten mixture of calcium fluoride and iron oxide in a mass ratio of 2-6:1. Therefore, preparing modified calcium fluoride from a molten mixture of calcium fluoride and iron oxide significantly reduces the melting temperature, production difficulty, and manufacturing costs.

[0083] Example 5

[0084] The difference between Example 5 and Example 2 is that the polyvinyl alcohol in Example 5 is a modified polyvinyl alcohol with grafted and replaced hydroxyl groups modified by epoxy resin. Specifically, a polyvinyl alcohol solution with a mass concentration of 6-8% is heated to 70°C, and then 2% epoxy resin is added by mass and reacted for 3 hours. During the reaction, the temperature is gradually reduced to 60°C to obtain epoxy resin modified polyvinyl alcohol. This allows the modified polyvinyl alcohol to effectively reduce the negative impact of the antistatic masterbatch on the water repellency of the nonwoven fabric surface layer.

[0085] Comparative Example 1

[0086] The difference between Comparative Example 1 and Example 2 is that the antistatic masterbatch in Comparative Example 1 is graphene.

[0087] Comparative Example 2

[0088] The difference between Comparative Example 2 and Example 2 is that the antistatic masterbatch in Comparative Example 2 did not contain ferric sulfate.

[0089] Comparative Example 3

[0090] The difference between Comparative Example 3 and Example 2 is that the antistatic polyethylene nonwoven fabric in Comparative Example 3 is a single-layer antistatic functional layer.

[0091] Testing: Surface resistance, mechanical properties and water resistance were tested for Examples 1 to 5 and Comparative Examples 1 to 3, and the temperature and humidity were controlled at 25°C and 55% during the tests.

[0092] The surface resistance test shall be carried out in accordance with Appendix B of GB / T24249-2009.

[0093] The mechanical properties were tested by measuring the force applied when a 50mm wide section was broken, in accordance with GB / T3923.1-2013.

[0094] The water resistance test was conducted according to GB / T4744.

[0095] Table 1 Performance Test Results

[0096]

[0097] As shown in Table 1, the antistatic polyethylene nonwoven fabric produced by the antistatic polyethylene nonwoven fabric manufacturing process of this application has the advantages of improving mechanical properties through a multi-layer composite structure. At the same time, the use of antistatic masterbatch to make the nonwoven fabric surface layer and applying it to both sides of the polyethylene nonwoven fabric impregnated with antistatic solution significantly improves the service life and performance of antistatic properties. This allows the antistatic polyethylene nonwoven fabric to maintain its antistatic ability after multiple washes, achieve good water permeability, and ensure high mechanical strength, effectively avoiding the negative impact of graphene materials on durability and strength.

[0098] In summary, this application provides a manufacturing process for antistatic polyethylene nonwoven fabric. This process firstly addresses the static electricity problem caused by the high insulation properties of polyethylene nonwoven fabric by using a multi-layered composite structure to prepare a composite antistatic nonwoven fabric. The high-strength graphene and its mixed solvent attached to the antistatic functional layer solve the problem. Simultaneously, the hot-rolled nonwoven fabric surface layer effectively prevents the graphene, the effective antistatic component, from detaching from the polyethylene nonwoven fabric, thus avoiding a decrease in antistatic ability. Specifically, the antistatic masterbatch added to the nonwoven fabric surface layer uses calcium fluoride dissolved in hydrofluoric acid to form a complex with ferric sulfate, combined with the mixed adsorption of polyvinyl alcohol and chitosan, to obtain an antistatic masterbatch with effective antistatic capabilities. The surface layer mixture of the antistatic masterbatch and polyethylene material is then spunbonded to obtain a nonwoven fabric surface layer with effective antistatic capabilities. Meanwhile, by impregnating the antistatic components in the antistatic solution with a polyethylene nonwoven fabric prepared from a mixture of high-density polyethylene, trichlorofluoromethane, cis-dichloroethylene, and 1,2-dichloroethane, the hydrophilic groups effectively prevent the antistatic functional layer from affecting its water-repellent ability, while also ensuring the antistatic functional layer possesses good mechanical properties. Therefore, this composite antistatic nonwoven fabric, by utilizing the electrical conductivity between the graphene in the antistatic functional layer and the antistatic masterbatch in the nonwoven fabric surface layer, achieves the goal of solving the problem of static electricity generated by friction while avoiding the impact on mechanical properties.

[0099] The terms “first,” “second,” “third,” “fourth,” etc., used in this application (if applicable) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, or apparatus that includes a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, or apparatus.

[0100] It should be noted that the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0101] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A manufacturing process for antistatic polyethylene nonwoven fabric, characterized in that, Includes the following steps: Step 1, Raw material preparation: Mix the antistatic masterbatch with polyethylene material to obtain the surface layer mixture material; Step 2, Single-layer preparation: Non-woven fabric surface layer is obtained by spunbonding based on surface layer mixed material and polyethylene non-woven fabric is obtained by flash evaporation. The polyethylene non-woven fabric is then subjected to antistatic solution impregnation, removal and cooling to room temperature and low temperature drying treatment to obtain antistatic functional layer. Step 3, Composite preparation: Take two layers of non-woven fabric surface and attach them to both sides of the antistatic functional layer respectively, and then perform hot rolling treatment to obtain composite antistatic non-woven fabric; in: The antistatic solution comprises graphene and a mixed solvent; The antistatic masterbatch is obtained by sequentially mixing and stirring calcium fluoride, polyvinyl alcohol, chitosan, water, hydrofluoric acid and ferric sulfate, heating to 60°C and stirring continuously for 5-12 minutes, and then cooling and drying. The mass ratio of calcium fluoride, polyvinyl alcohol, chitosan, hydrofluoric acid, and ferric sulfate in the antistatic masterbatch is 1-2:12-16:1-4:30-50:0.013-0.019; and the mass fraction of the hydrofluoric acid is 40%. The calcium fluoride is modified calcium fluoride, which is obtained by chemical vapor deposition of a molten mixture of calcium fluoride and iron oxide in a mass ratio of 2-6:1; the polyvinyl alcohol is modified polyvinyl alcohol with hydroxyl groups grafted and replaced by epoxy resin.

2. The manufacturing process of antistatic polyethylene nonwoven fabric according to claim 1, characterized in that: The spunbond process includes feeding the surface layer mixture into a screw extruder for melt extrusion, followed by sequential extrusion through a spinneret, traction, and web formation. The surface layer mixture contains 0.8-8% antistatic masterbatch by mass percentage.

3. The manufacturing process of antistatic polyethylene nonwoven fabric according to claim 1, characterized in that: The flash evaporation method involves mixing high-density polyethylene material, trichlorofluoromethane, cis-dichloroethylene, and 1,2-dichloroethane in a mass ratio of 1:2.6-3.5:1.2-1.5:0.2-0.5 to form a spinning solution, and then passing the spinning solution through flash evaporation, web formation, and hot rolling to obtain polyethylene nonwoven fabric.

4. The manufacturing process of antistatic polyethylene nonwoven fabric according to claim 3, characterized in that: The flash evaporation method involves adding high-density polyethylene into an autoclave and heating it to 120-125°C. Then, trichlorofluoromethane, cis-dichloroethylene, and 1,2-dichloroethane are added to the autoclave. Stirring is started, and the temperature is gradually increased to 210-220°C under nitrogen protection while stirring is maintained for 0.5-2 hours to obtain the spinning solution.

5. The manufacturing process of antistatic polyethylene nonwoven fabric according to claim 1, characterized in that: The mixed solvent is a dispersant, polyvinylpyrrolidone, and 1-methyl-2-pyrrolidone; the ratio of graphene, dispersant, polyvinylpyrrolidone, and 1-methyl-2-pyrrolidone is 1g:0.01-0.1g:0.05-1ml:48-56ml; and the dispersant is a polyamino cationic peryleneimide graphene dispersant.

6. The manufacturing process of antistatic polyethylene nonwoven fabric according to claim 1, characterized in that: The immersion time is less than 15 minutes, the low-temperature drying temperature is 30-38℃, and ultrasonic vibration is used to apply the antistatic solution.

7. The manufacturing process of antistatic polyethylene nonwoven fabric according to claim 1, characterized in that: The hot rolling temperature is 100-130℃.

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