Industrial flame-retardant antistatic fabric and preparation method thereof

Abstract

The application provides an industrial flame-retardant antistatic fabric and a preparation method thereof, and belongs to the technical field of industrial fabric preparation, and comprises the following steps: mixing polypropylene particles, composite particles, antioxidant 1010, calcium stearate and erucamide, heating and stirring, melt extruding, air cooling, and obtaining nascent fibers; uniformly spreading the nascent fibers, hot rolling, and cooling to obtain the industrial flame-retardant antistatic fabric; the composite particles are obtained by mixing polyetherimide and N-methylpyrrolidone, heating and stirring, adding polyacrylate, poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, ammonium bicarbonate and polyvinylpyrrolidone, uniformly stirring, and performing spray drying to obtain porous master batches; the porous master batches are soaked in an ammonium polyphosphate solution, vacuum heating, poured into a polyvinyl alcohol solution, heated, filtered, washed and dried to obtain the industrial flame-retardant antistatic fabric. The industrial fabric provided by the application has good flame-retardant and antistatic properties.

Description

Technical Field

[0001] This invention relates to the field of industrial fabric preparation technology, specifically to an industrial flame-retardant and antistatic fabric and its preparation method. Background Technology

[0002] Industrial fabrics are widely used in power, chemical, and metallurgical industries. During use, they are prone to static electricity accumulation due to friction and stretching, and pose a high fire risk in high-temperature or open-flame environments. Therefore, higher requirements are placed on the antistatic and flame-retardant properties of these fabrics. Current technologies typically improve the safety performance of fabrics by introducing conductive and flame-retardant materials into the fiber raw materials or during processing.

[0003] However, existing industrial fabrics often achieve functional modification by directly adding inorganic flame-retardant particles or conductive fillers to the matrix. Since inorganic particles are prone to agglomeration and uneven distribution during stirring, melt blending or spinning, they are difficult to form a stable and continuous functional structure in the fabric's fiber system, thus affecting the fabric's flame-retardant and antistatic properties.

[0004] For example, patent application CN108360086A discloses a high-oxygen-index solar fabric and its preparation method, comprising the following raw materials in parts by weight: 90-100 parts of PVC resin, 10-15 parts of chlorinated polyvinyl chloride, 5-25 parts of phthalic plasticizer, 5-20 parts of phosphate plasticizer, 7-10 parts of antimony trioxide, 10-15 parts of chlorinated paraffin, 0.5-7 parts of zinc hydroxystannate, 7-10 parts of decabromodiphenyl ethane, 5-8 parts of magnesium hydroxide, 0.5-1.5 parts of composite ultraviolet absorber, 0.3-0.5 parts of lubricant, 1-1.5 parts of processing aid, 0.3-0.4 parts of antibacterial agent, 3-5 parts of heat stabilizer, and 1-10 parts of rutile titanium dioxide. This solution mainly improves the flame retardant properties and oxygen index of the fabric by directly adding inorganic flame retardant particles such as antimony trioxide and magnesium hydroxide. However, inorganic flame retardant particles are prone to agglomeration during processing and are difficult to form a uniform and stable dispersion structure in the matrix, which limits the degree of improvement on the flame retardant properties of the fabric.

[0005] In summary, there is a need to provide an industrial flame-retardant and antistatic fabric and its preparation method to solve the problems existing in the prior art. Summary of the Invention

[0006] In view of this, the present invention provides an industrial flame-retardant and antistatic fabric and its preparation method, which enables the industrial fabric to have good flame-retardant and antistatic properties.

[0007] To achieve the above objectives, the present invention provides a method for preparing an industrial flame-retardant and antistatic fabric, comprising the following steps:

[0008] S1. Mix polypropylene granules, composite granules, antioxidant 1010, calcium stearate and erucamide, heat and stir, melt and extrude, and air cool to obtain nascent fibers.

[0009] S2. Spread the nascent fibers evenly into a web, hot roll, and cool to obtain an industrial flame-retardant and antistatic fabric.

[0010] The composite particles are obtained by mixing polyetherimide and N-methylpyrrolidone, heating and stirring, adding polyacrylate, poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, ammonium bicarbonate and polyvinylpyrrolidone, stirring evenly, and spray drying to obtain porous masterbatch; the porous masterbatch is then immersed in ammonium polyphosphate solution, vacuum heated, poured into polyvinyl alcohol solution, heated, filtered, washed and dried to obtain the final product.

[0011] In the traditional process of industrial fabric preparation, the flame retardant and antistatic properties of the fabric are often improved by simply adding inorganic particulate materials. However, during the stirring process, the inorganic particulate materials are prone to agglomeration, resulting in uneven distribution of inorganic particles, which in turn affects the overall flame retardant and antistatic properties of the fabric.

[0012] This invention prepares a conductive porous masterbatch by combining polyetherimide and poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid. After loading ammonium polyphosphate, polyvinyl alcohol is coated onto the masterbatch to obtain composite particles, which are then introduced into industrial fabrics to improve their antistatic and flame-retardant properties. Specifically, the porous masterbatch, prepared by spray drying, has pores, providing spatial sites for loading the inorganic flame-retardant ammonium polyphosphate. Vacuum heating is used to ensure that the ammonium polyphosphate fully enters and adheres to the pores of the masterbatch, preventing agglomeration during subsequent stirring. Simultaneously, the polyvinyl alcohol coating on the composite particles "fixes" the ammonium polyphosphate within the pores of the masterbatch, preventing it from detaching during stirring and further ensuring uniform dispersion, thus laying the foundation for improved flame retardancy of the fabric. During subsequent melt extrusion, the polyvinyl alcohol on the surface of the composite particles melts, causing the porous masterbatch to contact each other and form a stable conductive network. This effectively eliminates static electricity accumulation caused by friction and other factors, thereby improving the antistatic properties of the fabric. When the fabric is exposed to the high temperature of an open flame, the polyvinyl alcohol on the composite particles melts with the porous masterbatch, releasing ammonium polyphosphate. The acidic substances produced by the thermal decomposition of ammonium polyphosphate promote the formation of a protective carbonized layer on the fabric surface, effectively blocking the spread of flames and the conduction of heat, thereby improving the flame retardant properties of the fabric.

[0013] In this invention, composite particles are stably introduced into a polypropylene system through melt extrusion, achieving integrated construction of functional components during the nascent fiber forming stage. This ensures the processing stability of the material system and facilitates the uniform distribution of flame-retardant and antistatic functions at the fiber scale. Based on this, web-laying and hot-rolling processes transform the nascent fibers into a dense and stable fabric form, creating a continuous contact structure between fibers, which promotes synergistic performance. This two-step process, from melt forming to structural shaping, establishes a complete workflow suitable for industrial production, providing a technological guarantee for the fabric to achieve stable flame-retardant and antistatic properties.

[0014] Optionally, during the preparation of the composite particles, expanded graphite is added before stirring until homogeneous; before immersing the porous masterbatch in ammonium polyphosphate solution, the porous masterbatch is rinsed with tert-butanol and freeze-dried.

[0015] In this invention, expanded graphite is introduced during the preparation stage of the porous masterbatch. Combined with tert-butanol washing and freeze-drying, the pore structure of the porous masterbatch and the distribution of flame-retardant materials are synergistically optimized, thereby further improving the flame-retardant and antistatic properties of the fabric. Specifically, the introduced expanded graphite is stably anchored on the framework of the porous masterbatch, preventing its migration or agglomeration during subsequent melt blending. It also forms a more efficient conductive network during subsequent melt extrusion, thereby improving the antistatic properties of the fabric. Simultaneously, when exposed to open flame, the expanded graphite preferentially undergoes physical expansion, forming an initial carbonized support structure. This structure, in synergy with the acidic substances and gases generated by the thermal decomposition of ammonium polyphosphate, promotes the construction of an "expanded graphite physical carbon layer" on the fabric surface, effectively inhibiting droplet generation and delaying flame propagation, thereby improving the flame-retardant properties of the fabric. Secondly, tert-butanol, as a non-swellable organic solvent, can remove free particles and residual small molecules from porous masterbatches after rinsing, preventing them from migrating or agglomerating in subsequent processing and improving the pore flow. Subsequently, freeze-drying removes tert-butanol by sublimation at low temperatures, avoiding pore collapse caused by liquid-phase evaporation during conventional heat drying. This effectively maintains the original pore structure of the porous masterbatch, thereby improving the loading effect on ammonium polyphosphate and further enhancing the flame retardant properties of the fabric.

[0016] Optionally, in the preparation of the composite particles, polyetherimide and N-methylpyrrolidone are mixed, heated to 80-90°C, stirred at 500-700 rpm for 1-2 hours, cooled to room temperature, and then polyacrylate, poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, ammonium bicarbonate, expanded graphite and polyvinylpyrrolidone are added. The mixture is then heated to 40-50°C and stirred at 2000-5000 rpm for 10-30 minutes. The mixture is then fed into a spray drying device with an atomization pressure of 0.2-0.4 MPa to obtain porous masterbatch through spray drying.

[0017] In this invention, the porous masterbatch uses polyetherimide as a continuous skeleton material, introduces poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid as a conductive component, and combines it with polyacrylate and polyvinylpyrrolidone to form a stable composite system, allowing the conductive component to be uniformly embedded and fixed inside the skeleton. Simultaneously, ammonium bicarbonate releases gas during granulation, creating a porous structure on the resulting porous masterbatch. This structure not only provides stable spatial sites for subsequent ammonium polyphosphate loading, reducing the risk of flame retardant component agglomeration, but also facilitates the continuous distribution of the conductive component within the porous masterbatch, laying the foundation for the construction of a conductive network in the final fabric, thereby achieving a synergistic improvement in antistatic and flame retardant properties.

[0018] Optionally, the composite particles are obtained by immersing porous masterbatch in a 40wt% ammonium polyphosphate solution, evacuating to -0.1~-0.08MPa, heating to 50~60℃ and maintaining the temperature for 30~50min, filtering the solid and pouring it into a polyvinyl alcohol solution, heating to 40~50℃ and maintaining the temperature for 2~5min, filtering, washing with anhydrous ethanol 3~5 times and drying.

[0019] Optionally, in step S1, polypropylene granules, composite granules, antioxidant 1010, calcium stearate and erucamide are mixed, heated to 80~100℃ and stirred for 5~15 minutes until uniform, then fed into an extruder for melt extrusion, and cooled to 15~25℃ to obtain nascent fibers.

[0020] Optionally, the temperature of the melt extrusion is 205~210℃.

[0021] In this invention, the melt extrusion temperature is controlled within the range of 205~210℃, which allows the polypropylene matrix to fully melt and have good fluidity, while simultaneously causing the polyvinyl alcohol on the surface of the composite particles to melt and soften. This enhances the physical contact and interconnection between porous masterbatches, promotes the continuous construction of conductive pathways, and makes the antistatic network more stable and uniform, thereby improving the antistatic performance of industrial flame-retardant and antistatic fabrics.

[0022] Optionally, the porous masterbatch is rinsed with tert-butanol 2 to 3 times; the freeze-drying temperature is -10 to -5°C, and the freeze-drying time is 4 to 6 hours.

[0023] In this invention, tert-butanol is used to rinse the porous masterbatch, followed by freeze-drying. This process optimizes and stabilizes the pore structure of the masterbatch without damaging its skeletal structure. Specifically, tert-butanol rinsing effectively removes residual free particles and small molecules from the surface and pores of the porous masterbatch, maintaining the pore's openness and uniformity, and preventing localized agglomeration during subsequent loading of ammonium polyphosphate. Subsequent freeze-drying removes tert-butanol at low temperatures, avoiding pore collapse or densification caused by conventional heat drying. This ensures the preservation of the masterbatch's interconnected pore structure, facilitating the full entry and stable loading of ammonium polyphosphate into the pores, improving the dispersion uniformity of the flame-retardant components, and thus enhancing the flame-retardant properties of the fabric.

[0024] Optionally, in step S2, after the nascent fibers are evenly laid into a web, they are hot-rolled at 120~150℃ for 30~50s, and then cooled to room temperature to obtain an industrial flame-retardant and antistatic fabric.

[0025] The present invention also provides an industrial flame-retardant and antistatic fabric, prepared by the above method, comprising the following raw materials in parts by weight: 630-650 parts of polypropylene granules, 100-110 parts of composite granules, 1-2 parts of antioxidant 1010, 1-3 parts of calcium stearate, and 1-2.5 parts of erucamide; the porous masterbatch comprises the following raw materials in parts by weight: 18-20 parts of polyetherimide, 80-85 parts of N-methylpyrrolidone, 16-19 parts of polyacrylate, 8-10 parts of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, 4-5 parts of ammonium bicarbonate, 1-2 parts of polyvinylpyrrolidone, 250-300 parts of 40wt% ammonium polyphosphate solution, and 200-220 parts of 8wt% polyvinyl alcohol solution.

[0026] Optionally, the raw materials for the composite particles may also include 2 to 4 parts by weight of expanded graphite.

[0027] The above-described technical solution of the present invention has at least the following beneficial effects:

[0028] This invention prepares a conductive porous masterbatch by combining polyetherimide and poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid. After loading ammonium polyphosphate, polyvinyl alcohol is coated onto the masterbatch to obtain composite particles, thereby simultaneously improving the antistatic and flame-retardant properties of industrial fabrics. The porous masterbatch prepared by spray drying has interconnected pores, providing spatial sites for loading the inorganic flame-retardant ammonium polyphosphate. The polyvinyl alcohol coating on the surface of the porous masterbatch fixes the ammonium polyphosphate within the pores, preventing it from falling off during processing and further ensuring its uniform dispersion, laying the foundation for improving the flame retardancy of the fabric. During subsequent melt extrusion, the polyvinyl alcohol melts, causing the porous masterbatch to contact each other and form a stable conductive network, which helps improve antistatic properties. When the fabric is exposed to an open flame, the polyvinyl alcohol and porous masterbatch melt and release ammonium polyphosphate. The acidic substances produced by its thermal decomposition promote the formation of a protective char layer on the fabric surface, effectively blocking flame propagation and heat conduction, thereby improving the flame-retardant properties of the fabric.

[0029] In this invention, composite particles are stably introduced into a polypropylene system through melt extrusion, achieving integrated construction of functional components during the nascent fiber forming stage and ensuring the processing stability of the material system. Based on this, the nascent fibers are transformed into a dense and stable fabric form through web laying and hot rolling processes, creating a continuous contact structure between the fibers. This two-step process, from melt forming to structural shaping, establishes a complete flow suitable for industrial production, providing a process guarantee for the fabric to achieve stable flame-retardant and antistatic properties. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. The described embodiments are some embodiments of the present invention, and all other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0031] Example 1

[0032] 18 parts of polyetherimide and 80 parts of N-methylpyrrolidone were mixed, heated to 80°C, and stirred at 500 rpm for 1 hour. After cooling to room temperature, 16 parts of polyacrylate, 8 parts of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, 4 parts of ammonium bicarbonate, 2 parts of expanded graphite and 1 part of polyvinylpyrrolidone were added. The mixture was heated to 40°C and stirred at 2000 rpm for 10 minutes. The mixture was then fed into a spray drying device with an atomization pressure of 0.2 MPa to obtain porous masterbatch by spray drying.

[0033] The porous masterbatch was rinsed twice with tert-butanol and freeze-dried at -10°C for 4 hours. Then, it was soaked in 250 parts of 40wt% ammonium polyphosphate solution, vacuumed to -0.1MPa, and heated to 50°C for 30 minutes. The solid obtained after filtration was poured into 200 parts of 8wt% polyvinyl alcohol solution, heated to 40°C for 2 minutes, filtered, washed three times with anhydrous ethanol, and dried to obtain composite particles.

[0034] 630 parts polypropylene granules, 100 parts composite granules, 1 part antioxidant 1010, 1 part calcium stearate, and 1 part erucamide were mixed and heated to 80°C and stirred for 5 minutes until homogeneous. The mixture was then fed into an extruder and melt-extruded at 205°C. After cooling to 15°C, nascent fibers were obtained. The nascent fibers were then evenly web-laid and hot-rolled at 120°C for 30 seconds. After cooling to room temperature, an industrial flame-retardant and antistatic fabric was obtained.

[0035] Example 2

[0036] 19 parts of polyetherimide and 82 parts of N-methylpyrrolidone were mixed, heated to 85°C, and stirred at 600 rpm for 1.5 h. After cooling to room temperature, 17 parts of polyacrylate, 9 parts of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, 4.5 parts of ammonium bicarbonate, 3 parts of expanded graphite, and 1.5 parts of polyvinylpyrrolidone were added. The mixture was heated to 45°C and stirred at 3500 rpm for 20 min. The mixture was then fed into a spray drying device with an atomization pressure of 0.3 MPa to obtain porous masterbatch by spray drying.

[0037] The porous masterbatch was washed three times with tert-butanol and freeze-dried at -8°C for 5 hours. Then, it was immersed in 270 parts of 40 wt% ammonium polyphosphate solution, vacuumed to -0.09 MPa, and heated to 55°C for 40 minutes. The solid obtained after filtration was poured into 210 parts of 8 wt% polyvinyl alcohol solution, heated to 45°C for 4 minutes, filtered, washed four times with anhydrous ethanol, and dried to obtain composite particles.

[0038] 640 parts of polypropylene granules, 105 parts of composite granules, 1.5 parts of antioxidant 1010, 2 parts of calcium stearate, and 2 parts of erucamide were mixed and heated to 90°C and stirred for 10 minutes until homogeneous. The mixture was then fed into an extruder and melt-extruded at 208°C. After cooling to 20°C, nascent fibers were obtained. The nascent fibers were then evenly web-laid and hot-rolled at 135°C for 40 seconds. After cooling to room temperature, an industrial flame-retardant and antistatic fabric was obtained.

[0039] Example 3

[0040] 20 parts of polyetherimide and 85 parts of N-methylpyrrolidone were mixed and heated to 90°C. The mixture was stirred at 700 rpm for 2 hours. After cooling to room temperature, 19 parts of polyacrylate, 10 parts of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, 5 parts of ammonium bicarbonate, 4 parts of expanded graphite and 2 parts of polyvinylpyrrolidone were added. The mixture was heated to 50°C and stirred at 5000 rpm for 30 minutes. The mixture was then fed into a spray drying device with an atomization pressure of 0.4 MPa to obtain porous masterbatch by spray drying.

[0041] The porous masterbatch was washed three times with tert-butanol and freeze-dried at -5°C for 6 hours. Then, it was soaked in 300 parts of 40 wt% ammonium polyphosphate solution, vacuumed to -0.08 MPa, and heated to 60°C for 50 minutes. The solid obtained after filtration was poured into 220 parts of 8 wt% polyvinyl alcohol solution, heated to 50°C for 5 minutes, filtered, washed five times with anhydrous ethanol, and dried to obtain composite particles.

[0042] 650 parts of polypropylene granules, 110 parts of composite granules, 2 parts of antioxidant 1010, 3 parts of calcium stearate, and 2.5 parts of erucamide were mixed, heated to 100°C, and stirred for 15 minutes until homogeneous. The mixture was then fed into an extruder and melt-extruded at 210°C. After cooling to 25°C, nascent fibers were obtained. The nascent fibers were then evenly web-laid and hot-rolled at 150°C for 50 seconds. After cooling to room temperature, an industrial flame-retardant and antistatic fabric was obtained.

[0043] Example 4

[0044] 18 parts of polyetherimide and 80 parts of N-methylpyrrolidone were mixed, heated to 80°C, and stirred at 500 rpm for 1 hour. After cooling to room temperature, 16 parts of polyacrylate, 8 parts of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, 4 parts of ammonium bicarbonate and 1 part of polyvinylpyrrolidone were added. The mixture was heated to 40°C and stirred at 2000 rpm for 10 minutes. The mixture was then fed into a spray drying device with an atomization pressure of 0.2 MPa to obtain porous masterbatch by spray drying.

[0045] The porous masterbatch was immersed in 250 parts of 40wt% ammonium polyphosphate solution, vacuumed to -0.1MPa, and heated to 50℃ for 30min. The resulting solid was filtered and poured into 200 parts of 8wt% polyvinyl alcohol solution, heated to 40℃ for 2min, filtered, washed three times with anhydrous ethanol, and dried to obtain composite particles.

[0046] 630 parts polypropylene granules, 100 parts composite granules, 1 part antioxidant 1010, 1 part calcium stearate, and 1 part erucamide were mixed and heated to 80°C and stirred for 5 minutes until homogeneous. The mixture was then fed into an extruder and melt-extruded at 205°C. After cooling to 15°C, nascent fibers were obtained. The nascent fibers were then evenly web-laid and hot-rolled at 120°C for 30 seconds. After cooling to room temperature, an industrial flame-retardant and antistatic fabric was obtained.

[0047] Example 5

[0048] 19 parts of polyetherimide and 82 parts of N-methylpyrrolidone were mixed, heated to 85°C, and stirred at 600 rpm for 1.5 h. After cooling to room temperature, 17 parts of polyacrylate, 9 parts of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, 4.5 parts of ammonium bicarbonate and 1.5 parts of polyvinylpyrrolidone were added. The mixture was heated to 45°C and stirred at 3500 rpm for 20 min. The mixture was then fed into a spray drying device with an atomization pressure of 0.3 MPa to obtain porous masterbatch by spray drying.

[0049] The porous masterbatch was immersed in 270 parts of 40wt% ammonium polyphosphate solution, vacuumed to -0.09MPa, and heated to 55℃ for 40min. The resulting solid was filtered and poured into 210 parts of 8wt% polyvinyl alcohol solution, heated to 45℃ for 4min, filtered, washed 4 times with anhydrous ethanol, and dried to obtain composite particles.

[0050] 640 parts of polypropylene granules, 105 parts of composite granules, 1.5 parts of antioxidant 1010, 2 parts of calcium stearate, and 2 parts of erucamide were mixed and heated to 90°C and stirred for 10 minutes until homogeneous. The mixture was then fed into an extruder and melt-extruded at 208°C. After cooling to 20°C, nascent fibers were obtained. The nascent fibers were then evenly web-laid and hot-rolled at 135°C for 40 seconds. After cooling to room temperature, an industrial flame-retardant and antistatic fabric was obtained.

[0051] Example 6

[0052] 20 parts of polyetherimide and 85 parts of N-methylpyrrolidone were mixed, heated to 90°C, and stirred at 700 rpm for 2 hours. After cooling to room temperature, 19 parts of polyacrylate, 10 parts of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, 5 parts of ammonium bicarbonate and 2 parts of polyvinylpyrrolidone were added. The mixture was heated to 50°C and stirred at 5000 rpm for 30 minutes. The mixture was then fed into a spray drying device with an atomization pressure of 0.4 MPa to obtain porous masterbatch by spray drying.

[0053] The porous masterbatch was immersed in 300 parts of 40wt% ammonium polyphosphate solution, vacuumed to -0.08MPa, and heated to 60℃ for 50min. The resulting solid was filtered and poured into 220 parts of 8wt% polyvinyl alcohol solution, heated to 50℃ for 5min, filtered, washed 5 times with anhydrous ethanol, and dried to obtain composite particles.

[0054] 650 parts of polypropylene granules, 110 parts of composite granules, 2 parts of antioxidant 1010, 3 parts of calcium stearate, and 2.5 parts of erucamide were mixed, heated to 100°C, and stirred for 15 minutes until homogeneous. The mixture was then fed into an extruder and melt-extruded at 210°C. After cooling to 25°C, nascent fibers were obtained. The nascent fibers were then evenly web-laid and hot-rolled at 150°C for 50 seconds. After cooling to room temperature, an industrial flame-retardant and antistatic fabric was obtained.

[0055] The present invention also includes comparative examples and related experiments.

[0056] Comparative Example 1

[0057] The only difference from Example 1 is that poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid was not added; all other components and preparation steps were exactly the same, resulting in an industrial flame-retardant and antistatic fabric.

[0058] Comparative Example 2

[0059] The only difference from Example 1 is that when the porous masterbatch was immersed in ammonium polyphosphate solution and heated, no vacuum was applied. The other components and preparation steps were completely the same, and an industrial flame-retardant and antistatic fabric was obtained.

[0060] Comparative Example 3

[0061] The only difference from Example 1 is that the porous masterbatch was not poured into the polyvinyl alcohol solution. The other components and preparation steps are completely the same, and an industrial flame-retardant and antistatic fabric is obtained.

[0062] The antistatic properties of the industrial flame-retardant and antistatic fabrics prepared in Examples 1-6 and Comparative Examples 1-3 were tested by point-to-point resistance according to the AATCC 76-2019 standard. The test results are shown in Table 1.

[0063] The flame retardant properties of the industrial flame retardant and antistatic fabrics prepared in Examples 1-6 and Comparative Examples 1-3 were tested. The limiting oxygen index (LOI) was tested according to standard GB / T 5454-1997, and the afterflame time was tested according to standard GB / T 5455-2014. The test results are shown in Table 1.

[0064] The mechanical properties of the industrial flame-retardant and antistatic fabrics prepared in Examples 1-6 and Comparative Examples 1-3 were tested for tensile strength in accordance with the standard GB / T3923.1-2013. The test results are shown in Table 1.

[0065] Table 1

[0066]

[0067] Compared to Examples 1-3, the industrial flame-retardant and antistatic fabrics in Examples 4-6 did not have expanded graphite added during the preparation of the porous masterbatch, and the porous masterbatch was not subjected to tert-butanol washing and freeze-drying treatment. Combined with the test results in Table 1, it can be seen that the point-to-point resistance and afterflame time of the industrial flame-retardant and antistatic fabrics in Examples 4-6 increased, while the limiting oxygen index (LOI) decreased. This indicates that adding expanded graphite during the preparation of the porous masterbatch, and subjecting the porous masterbatch to tert-butanol washing and freeze-drying treatment, helps to improve the antistatic and flame-retardant properties of the industrial flame-retardant and antistatic fabric.

[0068] Based on the test results in Table 1, it can be seen that, compared with Example 1, the point-to-point resistance of the industrial flame-retardant and antistatic fabric in Comparative Example 1 increased significantly, indicating that poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid helps improve the antistatic performance of the industrial flame-retardant and antistatic fabric. Compared with Example 1, the limiting oxygen index (LOI) of the industrial flame-retardant and antistatic fabric in Comparative Example 2 decreased, while the afterflame time increased, indicating that vacuuming while immersing the porous masterbatch in ammonium polyphosphate solution and heating helps improve the flame-retardant performance of the industrial flame-retardant and antistatic fabric. Compared with Example 1, the limiting oxygen index (LOI) of the industrial flame-retardant and antistatic fabric in Comparative Example 3 decreased, while the afterflame time increased, indicating that treating the porous masterbatch with polyvinyl alcohol helps improve the flame-retardant performance of the industrial flame-retardant and antistatic fabric.

[0069] In Examples 1-6, the breaking strength of the industrial flame-retardant and antistatic fabric is distributed in the range of 1292.4-1322.6 N, indicating that the industrial flame-retardant and antistatic fabric of the present invention has good processability and is conducive to repeated industrial production.

[0070] The above are preferred embodiments of the present invention. Those skilled in the art can make several improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing an industrial flame-retardant and antistatic fabric, characterized in that, Includes the following steps: S1. Mix 630-650 parts of polypropylene granules, 100-110 parts of composite granules, 1-2 parts of antioxidant 1010, 1-3 parts of calcium stearate and 1-2.5 parts of erucamide, heat and stir, melt and extrude, cool and cool down to obtain nascent fibers. S2. Spread the nascent fibers evenly into a web, hot roll, and cool to obtain an industrial flame-retardant and antistatic fabric. The composite particles are obtained by mixing 18-20 parts of polyetherimide and 80-85 parts of N-methylpyrrolidone, heating and stirring, adding 16-19 parts of polyacrylate, 8-10 parts of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, 4-5 parts of ammonium bicarbonate, 2-4 parts of expanded graphite and 1-2 parts of polyvinylpyrrolidone, stirring evenly, and spray drying to obtain porous masterbatch; washing the porous masterbatch with tert-butanol and freeze-drying it, then immersing it in 250-300 parts of 40wt% ammonium polyphosphate solution, vacuum heating, pouring it into 200-220 parts of 8wt% polyvinyl alcohol solution, heating, filtering, washing and drying. All portions are by weight.

2. The method for preparing an industrial flame-retardant and antistatic fabric according to claim 1, characterized in that, In the preparation process of the composite particles, polyetherimide and N-methylpyrrolidone are mixed, heated to 80-90°C, stirred at 500-700 rpm for 1-2 hours, cooled to room temperature, and then polyacrylate, poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, ammonium bicarbonate, expanded graphite and polyvinylpyrrolidone are added. The mixture is heated to 40-50°C and stirred at 2000-5000 rpm for 10-30 minutes. The mixture is then fed into a spray drying device with an atomization pressure of 0.2-0.4 MPa to obtain porous masterbatch through spray drying.

3. The method for preparing an industrial flame-retardant and antistatic fabric according to claim 2, characterized in that, The composite particles are obtained by immersing porous masterbatch in a 40wt% ammonium polyphosphate solution, evacuating to -0.1 to -0.08 MPa, heating to 50 to 60°C and maintaining the temperature for 30 to 50 minutes, filtering the solid, pouring it into a polyvinyl alcohol solution, heating to 40 to 50°C and maintaining the temperature for 2 to 5 minutes, filtering, washing with anhydrous ethanol 3 to 5 times, and then drying.

4. The method for preparing an industrial flame-retardant and antistatic fabric according to claim 1, characterized in that, In step S1, polypropylene granules, composite granules, antioxidant 1010, calcium stearate and erucamide are mixed, heated to 80~100℃ and stirred for 5~15 minutes until uniform, then fed into an extruder for melt extrusion, and cooled to 15~25℃ to obtain nascent fibers.

5. The method for preparing an industrial flame-retardant and antistatic fabric according to claim 4, characterized in that, The temperature of the melt extrusion is 205~210℃.

6. The method for preparing an industrial flame-retardant and antistatic fabric according to claim 1, characterized in that, The porous masterbatch is rinsed with tert-butanol 2 to 3 times; the freeze-drying temperature is -10 to -5°C, and the freeze-drying time is 4 to 6 hours.

7. The method for preparing an industrial flame-retardant and antistatic fabric according to claim 1, characterized in that, In step S2, after the nascent fibers are evenly laid into a web, they are hot-rolled at 120~150℃ for 30~50s, and then cooled to room temperature to obtain an industrial flame-retardant and antistatic fabric.

8. An industrial flame-retardant and antistatic fabric, prepared by the method for preparing an industrial flame-retardant and antistatic fabric according to any one of claims 1 to 7, characterized in that, The raw materials include the following parts by weight: 630-650 parts of polypropylene granules, 100-110 parts of composite granules, 1-2 parts of antioxidant 1010, 1-3 parts of calcium stearate, and 1-2.5 parts of erucamide; the porous masterbatch includes the following parts by weight: 18-20 parts of polyetherimide, 80-85 parts of N-methylpyrrolidone, 16-19 parts of polyacrylate, 8-10 parts of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid, 4-5 parts of ammonium bicarbonate, 2-4 parts of expanded graphite, 1-2 parts of polyvinylpyrrolidone, 250-300 parts of 40wt% ammonium polyphosphate solution, and 200-220 parts of 8wt% polyvinyl alcohol solution.

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