Manufacturing process of antistatic polyethylene non-woven fabric

Abstract

The invention discloses an antistatic polyethylene non-woven fabric manufacturing process, and relates to the technical field of polyethylene non-woven fabrics, and the antistatic polyethylene non-woven fabric manufacturing process comprises the following steps: step 1, raw material preparation: mixing antistatic master batch with a polyethylene material to obtain a surface layer mixed material; step 2, preparing a single layer: respectively obtaining a non-woven fabric surface layer based on the surface layer mixed material through a spunbond method and obtaining a polyethylene non-woven fabric based on a flash evaporation method, and then sequentially dipping the polyethylene non-woven fabric through an antistatic solution, taking out the polyethylene non-woven fabric, cooling the polyethylene non-woven fabric to room temperature and drying the polyethylene non-woven fabric at low temperature to obtain an antistatic functional layer; step 3, composite preparation: taking two non-woven fabric surface layers, respectively attaching the two non-woven fabric surface layers to two sides of the anti-static functional layer, and then performing hot rolling treatment to obtain the composite anti-static non-woven fabric; the method has the effects that the influence on mechanical properties is avoided while the problem of static electricity generated by friction is solved; graphene and a mixed solvent thereof are adopted to solve the electrostatic problem of the polyethylene non-woven fabric, and meanwhile, the non-woven fabric surface layer effectively avoids the problem that the antistatic capacity is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of polyethylene nonwoven fabrics, and in particular to a process for producing antistatic polyethylene nonwoven fabrics. Background Art

[0002] Polyethylene is one of the commonly used raw materials for producing nonwoven fabrics. Its main molding processes include meltblowing, spunbonding, water / needle punching and flash evaporation. Among them, the meltblowing method is a spinning method that uses high-speed hot air flow to quickly stretch and solidify the extruded polymer melt; the bonding method is to form a web through the airflow of short fibers or the fibers are combed, and then mechanically cross-laid, impregnated and bonded, and finally coated and dried to obtain a non-woven fabric. The product is suitable for thermal insulation flakes, electrical insulation material base fabrics, etc.; the water / needle punching method uses high-pressure water / steel needles to continuously spray / puncture the fiber web to make the fibers randomly entangled and cohesive. The products are fine and thick, suitable for geotextiles, carpets, synthetic leather base fabrics, etc.; the flash evaporation method is a proprietary process technology pioneered by DuPont for preparing polyethylene into non-woven fabrics. 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 instantly flashed, and the polymer is split and solidified into ultrafine fiber bundles. Under the action of static electricity, the fiber bundles form a fiber web, and the fiber web is heated, pressurized and hot-rolled by hot rollers to form a non-woven fabric.

[0003] Due to the high insulation properties of polyethylene materials, a large amount of static electricity will be generated when friction occurs, which seriously affects the comfort of polyethylene materials during use. The existing conventional operation to solve the static electricity problem of polyethylene materials is to add graphene or conductive carbon black as an antistatic material to reduce the insulation ability of the manufactured polyethylene material. However, adding graphene or conductive carbon black as an antistatic material will significantly reduce the mechanical properties of the polyethylene material, thereby affecting the service life and use effect of the polyethylene material, which needs to be improved. Summary of the invention

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

[0005] A process for producing an antistatic polyethylene nonwoven fabric comprises the following steps:

[0006] Step 1, raw material preparation: mixing antistatic masterbatch with polyethylene material to obtain a surface layer mixed material;

[0007] Step 2, single layer preparation: a non-woven fabric surface layer is obtained by a spunbond method based on the surface layer mixed material and a polyethylene non-woven fabric is obtained by a flash evaporation method, and then the polyethylene non-woven fabric is successively impregnated with an antistatic solution, taken out, cooled to room temperature and dried at low temperature to obtain an antistatic functional layer;

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

[0009] in:

[0010] The antistatic masterbatch comprises 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 calcium fluoride, polyvinyl alcohol, chitosan, water, hydrofluoric acid and ferric sulfate, heating to 60° C., stirring and reacting for 5-12 minutes, and 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 obtained by chemical vapor precipitation of a molten mixture of calcium fluoride and iron oxide in a mass ratio of 2-6:1; and the polyvinyl alcohol is modified polyvinyl alcohol in which hydroxyl groups are replaced by epoxy resin modification and grafting.

[0015] Preferably: the spunbonding method comprises the steps of feeding the surface layer mixed material into a screw extruder for melt extrusion, and then sequentially extruding through a spinneret, pulling and forming a web, wherein the surface layer mixed material contains 0.8-8% by mass of antistatic masterbatch.

[0016] Preferably, the flash method is to mix 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 flash spin the spinning solution, lay the web and hot-roll to obtain the polyethylene non-woven fabric.

[0017] Preferably: the flash evaporation method comprises 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, then gradually heating to 210-220°C under nitrogen protection and maintaining stirring for 0.5-2h to obtain a spinning solution, and then controlling the flash evaporation temperature to 130-140°C.

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

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

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

[0021] It can be seen from the above scheme that the present application provides a process for producing an antistatic polyethylene non-woven fabric, which has the following beneficial effects:

[0022] 1. The composite antistatic non-woven fabric prepared by the multi-layer composite structure solves the static electricity problem caused by the high insulation properties of the polyethylene non-woven fabric through the highly attached graphene and its mixed solvent on the antistatic functional layer. At the same time, the hot-rolled non-woven fabric surface layer will effectively avoid the problem of graphene, an effective antistatic component, falling off from the polyethylene non-woven fabric, which leads to a decrease in antistatic ability;

[0023] 2. Calcium fluoride in the antistatic masterbatch is dissolved in hydrofluoric acid and forms a complex material with ferric sulfate, combined with mixed adsorption of polyvinyl alcohol and chitosan to obtain an antistatic masterbatch with effective antistatic ability, so that the surface layer mixed material composed of the antistatic masterbatch and the polyethylene material is spunbonded to obtain a non-woven fabric surface layer with effective antistatic ability;

[0024] 3. Modified calcium fluoride is prepared by a mixed melt of calcium fluoride and iron oxide to significantly reduce the melting temperature, reduce the production difficulty and production cost, and the modified polyvinyl alcohol effectively reduces the negative impact of the antistatic masterbatch on the water repellency in the non-woven fabric surface layer;

[0025] 4. The antistatic components in the antistatic solution are impregnated with polyethylene non-woven fabric made of a mixture of high-density polyethylene material, trichlorofluoromethane, cis-dichloroethylene and 1,2-dichloroethane, so as to effectively avoid the hydrophilic group from affecting the water repellency of the antistatic functional layer and make the antistatic functional layer have good mechanical properties;

[0026] 5. By utilizing the electrical conductivity between the graphene in the antistatic functional layer and the antistatic masterbatch in the non-woven fabric surface layer, the composite antistatic non-woven fabric can solve the static electricity problem caused by friction while avoiding affecting the mechanical properties. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] The following is a detailed description of the production process of the antistatic polyethylene nonwoven fabric of the present application.

[0029] A process for producing an antistatic polyethylene nonwoven fabric comprises the following steps:

[0030] Step 1, raw material preparation: mixing antistatic masterbatch with polyethylene material to obtain a surface layer mixed material;

[0031] Step 2, single layer preparation: a non-woven fabric surface layer is obtained by a spunbond method based on the surface layer mixed material and a polyethylene non-woven fabric is obtained by a flash evaporation method, and then the polyethylene non-woven fabric is successively impregnated with an antistatic solution, taken out, cooled to room temperature and dried at low temperature to obtain an antistatic functional layer;

[0032] Step 3, composite preparation: take two layers of non-woven fabric surface layers and attach them to the two sides of the antistatic functional layer respectively, and then perform hot rolling treatment to obtain a 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 preparation of the antistatic masterbatch is obtained 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%, and then stirring, heating to 60°C for continuous stirring reaction for 5-12 minutes, and cooling and drying. The polyethylene material is high-density polyethylene and / or low-density polyethylene.

[0035] In step 2, the spunbond method includes feeding the surface layer mixed material into a screw extruder for melt extrusion, and then sequentially extruding through a spinneret, pulling and forming a web, wherein the surface layer mixed material contains 0.8-8% by mass of antistatic masterbatch.

[0036] Meanwhile, the flash method is to mix 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 the spinning solution is flash spun, laid and hot rolled to obtain a polyethylene non-woven fabric.

[0037] Specifically, 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 to 210-220°C under nitrogen protection and maintaining stirring for 0.5-2h to obtain a spinning solution, and then controlling the flash evaporation temperature to 130-140°C.

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

[0039] The mixed solvent is composed of a dispersant, polyvinyl pyrrolidone and 1-methyl-2-pyrrolidone in a dosage ratio of 1g: 0.01-0.1g: 0.05-1ml: 48-56ml. The graphene dispersant used in the present application is a polyamino cationic perylene imide graphene dispersant.

[0040] Meanwhile, the immersion 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° C., and ultrasonic vibration antistatic solution is used.

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

[0042] Embodiment 1

[0043] A process for producing an antistatic polyethylene nonwoven fabric comprises the following steps:

[0044] Step 1, raw material preparation: mixing antistatic masterbatch with polyethylene material to obtain a surface layer mixed material;

[0045] Step 2, single layer preparation: a non-woven fabric surface layer is obtained by a spunbond method based on the surface layer mixed material and a polyethylene non-woven fabric is obtained by a flash evaporation method, and then the polyethylene non-woven fabric is successively impregnated with an antistatic solution, taken out, cooled to room temperature and dried at low temperature to obtain an antistatic functional layer;

[0046] Step 3, composite preparation: take two layers of non-woven fabric surface layers and attach them to the two sides of the antistatic functional layer respectively, and then perform hot rolling treatment to obtain a 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%, and then stirring, heating to 60°C for continuous stirring reaction for 5 minutes, and cooling and drying, and the polyethylene material is high-density polyethylene.

[0049] In step 2, the spunbond method includes putting the surface layer mixed material into a screw extruder for melt extrusion, and then sequentially extruding through a spinneret, pulling and forming a web, wherein the surface layer mixed material contains 0.8% antistatic masterbatch by mass. At the same time, the flash method is to mix a 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, and then the spinning solution is flash-spinned, web-laid and hot-rolled to obtain a polyethylene non-woven fabric.

[0050] Specifically, the flash evaporation method includes adding high-density polyethylene into an autoclave and heating it to 120°C, then adding trichlorofluoromethane, cis-dichloroethylene and 1,2-dichloroethane into the autoclave, starting stirring, and then gradually heating to 2100°C under nitrogen protection and maintaining stirring for 2 hours to obtain a spinning solution, and then controlling the flash evaporation temperature to 130°C.

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

[0052] The antistatic solution is composed of graphene, dispersant, polyvinyl pyrrolidone and 1-methyl-2-pyrrolidone in a dosage ratio of 1g:0.01g:0.05ml:48ml. The graphene dispersant used in the present application is a polyamino cationic perylene imide graphene dispersant.

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

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

[0055] Embodiment 2

[0056] A process for producing an antistatic polyethylene nonwoven fabric comprises the following steps:

[0057] Step 1, raw material preparation: mixing antistatic masterbatch with polyethylene material to obtain a surface layer mixed material;

[0058] Step 2, single layer preparation: a non-woven fabric surface layer is obtained by a spunbond method based on the surface layer mixed material and a polyethylene non-woven fabric is obtained by a flash evaporation method, and then the polyethylene non-woven fabric is successively impregnated with an antistatic solution, taken out, cooled to room temperature and dried at low temperature to obtain an antistatic functional layer;

[0059] Step 3, composite preparation: take two layers of non-woven fabric surface layers and attach them to the two sides of the antistatic functional layer respectively, and then perform hot rolling treatment to obtain a 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 preparation of the antistatic masterbatch is obtained 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%, and then stirring, heating to 60°C for continuous stirring reaction for 8 minutes and 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 method includes putting the surface layer mixed material into a screw extruder for melt extrusion, and then sequentially extruding through a spinneret, pulling and forming a web, wherein the surface layer mixed material contains 5% antistatic masterbatch by mass. At the same time, the flash method is to mix a 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, and then the spinning solution is flash-spinned, web-laid and hot-rolled to obtain a polyethylene non-woven fabric.

[0063] Specifically, the flash evaporation method includes adding high-density polyethylene into an autoclave and heating it to 123°C, then adding trichlorofluoromethane, cis-dichloroethylene and 1,2-dichloroethane into the autoclave, starting stirring, and then gradually heating to 215°C under nitrogen protection and maintaining stirring for 1.5 hours to obtain a spinning solution, and then controlling the flash evaporation temperature to 135°C.

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

[0065] The antistatic solution is composed of graphene, dispersant, polyvinyl pyrrolidone and 1-methyl-2-pyrrolidone in a dosage ratio of 1g:0.05g:0.5ml:50ml. The graphene dispersant used in the present application is a polyamino cationic perylene imide graphene dispersant.

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

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

[0068] Embodiment 3

[0069] A process for producing an antistatic polyethylene nonwoven fabric comprises the following steps:

[0070] Step 1, raw material preparation: mixing antistatic masterbatch with polyethylene material to obtain a surface layer mixed material;

[0071] Step 2, single layer preparation: a non-woven fabric surface layer is obtained by a spunbond method based on the surface layer mixed material and a polyethylene non-woven fabric is obtained by a flash evaporation method, and then the polyethylene non-woven fabric is successively impregnated with an antistatic solution, taken out, cooled to room temperature and dried at low temperature to obtain an antistatic functional layer;

[0072] Step 3, composite preparation: take two layers of non-woven fabric surface layers and attach them to the two sides of the antistatic functional layer respectively, and then perform hot rolling treatment to obtain a 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%, and then stirring, heating to 60°C for continuous stirring reaction for 12 minutes, and cooling and drying, and the polyethylene material is low-density polyethylene.

[0075] In step 2, the spunbond method includes putting the surface layer mixed material into a screw extruder for melt extrusion, and then sequentially extruding through a spinneret, pulling and forming a web, wherein the surface layer mixed material contains 8% antistatic masterbatch by mass. At the same time, the flash method is to mix a 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, and then the spinning solution is flash-spinned, web-laid and hot-rolled to obtain a polyethylene non-woven fabric.

[0076] Specifically, the flash evaporation method includes adding high-density polyethylene into an autoclave and heating it to 125°C, then adding trichlorofluoromethane, cis-dichloroethylene and 1,2-dichloroethane into the autoclave, starting stirring, and then gradually heating to 220°C under nitrogen protection and maintaining stirring for 0.5h to obtain a spinning solution, and then controlling the flash evaporation temperature to 140°C.

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

[0078] The antistatic solution is composed of graphene, dispersant, polyvinyl pyrrolidone and 1-methyl-2-pyrrolidone in a dosage ratio of 1g:0.1g:1ml:56ml. The graphene dispersant used in the present application is a polyamino cationic perylene imide graphene dispersant.

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

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

[0081] Embodiment 4

[0082] The difference between Example 4 and Example 2 is that the calcium fluoride in Example 4 is modified calcium fluoride. The modified calcium fluoride is obtained by chemical vapor precipitation of a molten mixture of calcium fluoride and iron oxide in a mass ratio of 2-6:1. Therefore, the modified calcium fluoride is prepared by a mixed melt of calcium fluoride and iron oxide to significantly reduce the melting temperature, reduce the production difficulty and manufacturing cost.

[0083] Embodiment 5

[0084] The difference between Example 5 and Example 2 is that the polyvinyl alcohol in Example 5 is modified polyvinyl alcohol in which the hydroxyl group is replaced by epoxy resin. Specifically, a polyvinyl alcohol solution with a mass concentration of 6-8% is heated to 70°C, and then 2% of epoxy resin is added to react for 3 hours, and the temperature is gradually reduced to 60°C during the reaction to obtain epoxy resin modified polyvinyl alcohol, so that the modified polyvinyl alcohol can effectively reduce the negative impact of the antistatic masterbatch on the water repellency in the non-woven 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 no iron sulfate is added to the antistatic masterbatch in Comparative Example 2.

[0089] Comparative Example 3

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

[0091] Test: Surface resistance, mechanical property test and water permeability resistance test were performed on the above Examples 1 to 5 and Comparative Examples 1 to 3, and the temperature during the test was controlled to be 25° C. and the air humidity was 55%.

[0092] Among them, the surface resistance test is carried out in accordance with Appendix B of GB / T24249-2009.

[0093] The mechanical properties test refers to GB / T3923.1-2013 to measure the force required to break a 50mm wide wire.

[0094] The water seepage resistance test is carried out according to GB / T4744.

[0095] Table 1 Performance test results

[0096]

[0097] It can be seen from Table 1 that the antistatic polyethylene non-woven fabric obtained by the antistatic polyethylene non-woven fabric production process of the present application has improved mechanical properties through a multi-layer composite structure. The antistatic masterbatch is used to make the non-woven fabric surface layer and is applied to both sides of the polyethylene non-woven fabric impregnated with an antistatic solution, thereby significantly improving the antistatic service life and use effect, so that the antistatic polyethylene non-woven fabric maintains a long-lasting antistatic ability after multiple washings, and can achieve the purpose of good water permeability, and ensures high-strength mechanical properties, effectively avoiding the negative impact of graphene materials on durability and strength.

[0098] In summary, the present application provides a process for producing antistatic polyethylene nonwoven fabrics. The process for producing antistatic polyethylene nonwoven fabrics first solves the static electricity problem caused by the high insulation properties of polyethylene nonwoven fabrics by using a composite antistatic nonwoven fabric prepared by adopting a multi-layer composite structure, through the formation of graphene and its mixed solvent with high-strength attachment on the antistatic functional layer. At the same time, the hot-rolled nonwoven surface layer will effectively avoid the problem of graphene, which is an effective antistatic component, falling off from the polyethylene nonwoven fabric, resulting in a decrease in antistatic ability. Among them, the antistatic masterbatch added to the nonwoven surface layer adopts calcium fluoride dissolved in hydrofluoric acid and forms a complex material with ferric sulfate, combined with the mixed adsorption of polyvinyl alcohol and chitosan, to obtain an antistatic masterbatch with effective antistatic ability, so that the surface layer mixed material composed of the antistatic masterbatch and the polyethylene material is subjected to a spunbond method to obtain a nonwoven surface layer with effective antistatic ability. At the same time, the antistatic components in the antistatic solution are impregnated and attached by using a polyethylene non-woven fabric made of a mixture of high-density polyethylene material, trichlorofluoromethane, cis-dichloroethylene and 1,2-dichloroethane to effectively avoid the hydrophilic group from affecting the water repellency of the antistatic functional layer, and the antistatic functional layer has good mechanical properties. Therefore, the composite antistatic non-woven fabric uses the electrical conductivity between the graphene in the antistatic functional layer and the antistatic masterbatch in the non-woven fabric surface layer, so that the composite antistatic non-woven fabric has the purpose of solving the problem of static electricity generated by friction while avoiding affecting the mechanical properties.

[0099] The "first", "second", "third", "fourth", etc. (if any) referred to in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods or devices.

[0100] It should be noted that the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0101] Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A process for producing an antistatic polyethylene nonwoven fabric, characterized in that: The steps include: Step 1, raw material preparation: mixing antistatic masterbatch with polyethylene material to obtain a surface layer mixed material; Step 2, single layer preparation: a non-woven fabric surface layer is obtained by a spunbond method based on the surface layer mixed material and a polyethylene non-woven fabric is obtained by a flash evaporation method, and then the polyethylene non-woven fabric is successively impregnated with an antistatic solution, taken out, cooled to room temperature and dried at low temperature to obtain an antistatic functional layer; Step 3, composite preparation: take two layers of non-woven fabric surface layers and attach them to the two sides of the antistatic functional layer respectively, and then perform hot rolling treatment to obtain a composite antistatic non-woven fabric; in: The antistatic masterbatch comprises calcium fluoride, polyvinyl alcohol, chitosan, hydrofluoric acid and ferric sulfate; The antistatic solution comprises graphene and a mixed solvent.

2. The process for producing an antistatic polyethylene nonwoven fabric according to claim 1, characterized in that: 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., continuously stirring and reacting for 5-12 minutes, and cooling and drying.

3. The process for producing an antistatic polyethylene nonwoven fabric according to claim 1, characterized in that: 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%.

4. The process for producing an antistatic polyethylene nonwoven fabric according to claim 2, characterized in that: The calcium fluoride is modified calcium fluoride, which is obtained by chemical vapor precipitation 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 in which hydroxyl groups are replaced by epoxy resin modification and grafting.

5. The process for producing an antistatic polyethylene nonwoven fabric according to claim 1, characterized in that: The spunbonding method comprises the steps of feeding the surface layer mixed material into a screw extruder for melt extrusion, and then sequentially extruding through a spinneret, pulling and forming a web, wherein the surface layer mixed material contains 0.8-8% by mass of antistatic masterbatch.

6. The process for producing an antistatic polyethylene nonwoven fabric according to claim 1, characterized in that: The flash method comprises 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 flash spinning, web laying and hot rolling the spinning solution to obtain a polyethylene non-woven fabric.

7. The process for producing an antistatic polyethylene nonwoven fabric according to claim 6, characterized in that: The flash evaporation method comprises 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 to 210-220° C. under nitrogen protection and maintaining stirring for 0.5-2 hours to obtain a spinning solution.

8. The process for producing an antistatic polyethylene nonwoven fabric according to claim 1, characterized in that: The mixed solvent is a dispersant, polyvinyl pyrrolidone and 1-methyl-2-pyrrolidone; the usage ratio of the graphene, dispersant, polyvinyl pyrrolidone and 1-methyl-2-pyrrolidone is 1g: 0.01-0.1g: 0.05-1ml: 48-56ml; and the dispersant is a polyamino cationic perylene imide graphene dispersant.

9. The process for producing an 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° C., and ultrasonic vibration is used to vibrate the antistatic solution.

10. The process for producing an antistatic polyethylene nonwoven fabric according to claim 1, characterized in that: The hot rolling temperature is 100-130°C.

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