Composite filter material flame retardant filter cartridge and its manufacturing process

Abstract

The present application relates to the technical field of high-temperature flue gas filtration, and specifically discloses a composite filter material flame-retardant filter cartridge and its manufacturing process. The manufacturing process includes: opening, mixing, combing, laying, meshing, and pre-needling polyester fibers and glass fibers to obtain pre-needled felt; hydroentangling the pre-needled felt to obtain filter material felt; singeing the filter material felt, immersing it in an impregnation emulsion, squeezing the liquid, and drying it to obtain a stiff filter material; pleating and welding the stiff filter material into a cylindrical structure, welding a sealing band, and installing metal end caps at both ends of the cylindrical structure to obtain a composite filter material flame-retardant filter cartridge; the impregnation emulsion includes the following raw materials in the following weight percentages: 30-40% flame retardant, 30-40% stiffening agent, and 30-40% water. By adopting composite fibers and steps such as impregnation, squeezing, and drying, the present application can improve the high-temperature resistance and flame-retardant properties of the filter material while maintaining the strength of the filter material.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature smoke filtration, and in particular to a composite filter material flame-retardant filter cartridge and a manufacturing process thereof. Background Art

[0002] When existing industrial dust collectors are operating, dust-laden gas passes through the filter cartridge, trapping the dust on the outside of the cartridge. The filtered exhaust gas is then discharged from the inside. When the filter cartridge removes high-temperature flue gas, which is often accompanied by sparks and static electricity, it can easily cause combustion or even explosion, seriously impacting the safety of the dust collector. Therefore, it is necessary to improve the flame retardancy of the filter cartridge.

[0003] Related art discloses a high-temperature-resistant, stiffened needle-punched felt filter material comprising a base fabric layer and a high-temperature-resistant fiber layer. The high-temperature-resistant fiber layer is disposed on the base fabric layer and needle-bonded to the high-temperature-resistant fiber layer. The base fabric layer can be made of at least one of aramid, polyphenylene sulfide, polyimide, and glass fiber. The high-temperature-resistant fiber layer can be made of at least one of the following high-temperature-resistant fibers: aramid, polyphenylene sulfide, polyimide, and glass fiber.

[0004] The fibers used in the above filter materials, such as aramid, polyphenylene sulfide, polyimide, and glass fiber, can withstand certain high temperatures, but have poor flame retardancy. Therefore, the above filter materials are difficult to use in making filter cartridges for filtering high-temperature flue gas. Summary of the Invention

[0005] In order to improve the flame retardant performance of a filter cartridge, the present application provides a composite filter material flame retardant filter cartridge and a manufacturing process thereof.

[0006] In a first aspect, the present application provides a process for manufacturing a composite filter material flame-retardant filter cartridge, which adopts the following technical solution:

[0007] A manufacturing process of a composite filter material flame-retardant filter cartridge comprises the following steps:

[0008] The polyester fiber and the glass fiber are opened separately, and the polyester fiber and the glass fiber are mixed to obtain mixed fibers. The mixed fibers are carded, laid, combined and pre-needled using polyester cloth as a base fabric to obtain a pre-needled felt.

[0009] The pre-needled felt is subjected to a hydroentanglement reinforcement treatment to obtain a filter material felt;

[0010] The surface of the filter material felt is singed and then immersed in the impregnation emulsion, and the impregnated filter material felt is squeezed and dried to obtain a stiff filter material;

[0011] The stiff filter material is pleated to obtain pleated filter material, a band is welded to the pleated filter material along the width direction, the pleated filter material is then welded into a cylindrical structure, the sealing of the band is fixed by welding, and metal end caps are installed at both ends of the cylindrical structure to obtain a composite filter material flame retardant filter cartridge;

[0012] The impregnation emulsion comprises the following raw materials in weight percentage: 30-40% of a flame retardant, 30-40% of a stiffening agent and 30-40% of water.

[0013] By adopting the above technical solution, polyester fiber has good mechanical properties and wear resistance, while glass fiber has excellent high-temperature resistance. The use of a composite fiber of polyester fiber and glass fiber can maintain the strength of the filter material while also giving the filter material a certain degree of high-temperature resistance. This application also uses the steps of impregnation, liquid squeezing, and drying to allow the flame retardant and stiffening agent in the impregnation emulsion to adhere to the surface of the filter material and penetrate into the interior of the filter material, thereby enhancing the stiffness of the filter material and forming a protective layer on the surface of the filter material, so that it maintains a stable shape during the flame retardant process, is not easy to shrink or deform, and effectively prevents the spread of flames and the transfer of heat, thereby comprehensively improving the flame retardant properties of the composite filter material and the filter cartridge prepared using this composite filter material.

[0014] In a specific embodiment, the polyester fiber is made of modified polyester masterbatch, which includes the following raw materials in parts by weight: 70-80 parts of polyester masterbatch, 5-10 parts of bromotriazine, 5-13 parts of polyamide, and 5-7 parts of paraffin oil.

[0015] By employing this technical solution, bromotriazine decomposes at high temperatures to produce non-flammable gases, diluting the concentration of flammable gases and promoting the formation of a carbonized layer on the polymer surface. Polyamide improves the mechanical properties and wear resistance of polyester. Furthermore, the good compatibility between polyamide and polyester contributes to a stable blend system. Paraffin oil reduces the friction coefficient of the modified polyester masterbatch during processing and improves processing fluidity. Therefore, modifying polyester masterbatch with bromotriazine, polyamide, and paraffin oil can significantly enhance the flame retardancy of polyester while maintaining its mechanical properties, further improving the flame retardancy of filter media and filter cartridges.

[0016] In a specific embodiment, the modified polyester masterbatch further comprises the following raw materials in parts by weight: 5-10 parts of hexamethylenediamine.

[0017] By adopting the above technical solution, hexamethylenediamine contains amino groups, which can chemically react with ester groups or other functional groups on the polyester molecular chain to graft and modify the polyester molecules, so that the filter material can better combine with the flame retardant or stiffening agent during the impregnation process, thereby further improving the flame retardant and mechanical properties of the filter material and filter cartridge.

[0018] In a specific embodiment, the method for preparing the polyester fiber comprises the following steps:

[0019] Weighing polyester masterbatch, bromotriazine, polyamide, hexamethylenediamine and paraffin oil, mixing and melt-blending to obtain a molten material, and extruding the molten material into granules to obtain a modified polyester masterbatch;

[0020] The polyester masterbatch is cleaned and dried, and then added into a melt spinning machine for melting and spinning to form nascent fibers, which are then drawn and heat-set to obtain polyester fibers.

[0021] By adopting the above technical solution, the polyester masterbatch is cleaned and dried to remove moisture and impurities, ensuring the stability of the spinning process. Drawing can improve the orientation and crystallinity of the fiber. During the drawing process, heat setting further stabilizes the structure of the polyester fiber, thereby enhancing its mechanical properties.

[0022] In a specific embodiment, the flame retardant is triphenyl phosphate.

[0023] By adopting this technical solution, triphenyl phosphate exhibits low volatility and excellent flame retardancy. It rapidly decomposes during combustion, producing compounds such as phosphoric acid and phenol. These compounds capture free radicals in the flame, interrupting the combustion chain reaction and thereby improving the flame retardancy of the filter media and filter cartridge. Furthermore, the amino group of hexamethylenediamine forms a phosphorus-nitrogen bond with the phosphorus-oxygen bond in triphenyl phosphate, connecting the triphenyl phosphate to the polyester molecule. This enhances the impregnation effect, improves the adhesion of the triphenyl phosphate, and further strengthens the flame retardancy of the filter media and filter cartridge.

[0024] In a specific embodiment, the stiffening agent includes the following raw materials in parts by weight: 70-85 parts of melamine, 10-20 parts of polyurethane crosslinking agent and 5-10 parts of metal oxide.

[0025] By adopting this technical solution, melamine decomposes at high temperatures to produce non-flammable nitrogen, diluting the oxygen concentration in the air and thus providing a synergistic flame retardant effect. Furthermore, melamine reacts with acidic substances such as phosphoric acid produced by the decomposition of triphenyl phosphate to form stable compounds, reducing the release of harmful gases. The polyurethane crosslinker has excellent film-forming and adhesive properties, helping to adhere triphenyl phosphate to the filter media surface and forming a flame-retardant film, enhancing the filter media's flame retardancy and durability. Metal oxides react at high temperatures with acidic substances such as phosphoric acid produced by the decomposition of triphenyl phosphate to form stable salt compounds, thereby reducing the release of harmful gases and improving the filter media's flame retardancy. Furthermore, the metal oxides also enhance the filter media's thermal stability.

[0026] In a specific embodiment, the impregnated filter material felt is squeezed and dried, with a squeeze margin of 110-120%, and dried at a drying temperature of 140°C-240°C to obtain a stiff filter material with a gram weight of 320-360g / m 2 .

[0027] By adopting the above technical solution, the present applicant has found through experiments that within the above ranges of rolling allowance, drying temperature, and gram weight, the composite filter material flame-retardant filter cartridge has more excellent mechanical properties. Therefore, adopting the above process conditions helps to improve the durability of the filter cartridge.

[0028] In a specific embodiment, in the mixed fibers, the weight percentage of the glass fibers is 20-50%, and the weight percentage of the polyester fibers is 50-80%.

[0029] By adopting the above technical solution, the present applicant has found through experiments that the composite filter material flame-retardant filter cartridge prepared under the above fiber ratio has more excellent mechanical properties.

[0030] In a second aspect, the present application provides a composite filter material flame retardant filter cartridge, which adopts the following technical solution:

[0031] A composite filter material flame retardant filter cartridge is manufactured using the above composite filter material flame retardant filter cartridge manufacturing process.

[0032] In summary, this application has the following beneficial effects:

[0033] 1. This application adopts composite fibers and steps such as impregnation, liquid pressing and drying, which can improve the high temperature resistance and flame retardancy of the filter material while maintaining its strength.

[0034] 2. In this application, modified polyester masterbatch and triphenyl phosphate are preferably used to further enhance the flame retardant effect of the filter material and filter cartridge. DETAILED DESCRIPTION

[0035] The present application is further described in detail below with reference to examples and comparative examples.

[0036] Example

[0037] Example 1

[0038] This embodiment provides a process for manufacturing a composite filter material flame-retardant filter cartridge, comprising the following steps:

[0039] Polyester fiber and glass fiber were opened separately and mixed with polyester fiber (Hangzhou Haoye W6005) and glass fiber (Rhodia SX218V50) according to the following weight percentages: 65% polyester fiber and 35% glass fiber to produce a blended fiber. The blended fiber was fed into a cotton feeding box for carding. The feeding box was operated at the following speeds: bottom conveyor belt speed of 1.5-2.0 m / min, corner nail curtain conveyor speed of 10-15 m / min, cotton distribution roller speed of 150-180 m / min, and stripping roller speed of 150-180 m / min. The fibers were then fed into a carding machine. The carding machine was operated at the following speeds: discharge doffer speed of 20 m / min, licker-in speed of 400 m / min, working roller speed of 10 m / min, stripping roller speed of 150 m / min, and cylinder speed of 800-1000 m / min. Then it is sent to the net laying machine. The operating parameters of the net laying machine are: the conveyor belt is stretched 105-110%, the net laying car is stretched 105-110%, and the polyester cloth is used as the base fabric for net laying and netting. Then, the pre-needling machine is used for pre-needling. The operating parameters of the needle loom are: needle length 3.5mm, needle density 5000p / m, needling depth 12-15mm, needling density 60-90p / cm 2 , and obtain a pre-needled felt.

[0040] The pre-needled felt is subjected to hydroentanglement reinforcement treatment using five hydroentanglement heads, and the pre-needled felt is sequentially passed through 1#200-260bar, 2#180-200bar, 3#200-260bar, 4#180-200bar, and 5#200-260bar at a speed of 5-6m / min and a drying temperature of 100-150°C to obtain filter material felt.

[0041] The surface of the filter material felt is singed at a singeing speed of 10-10.5 m / min, and then immersed in the impregnation emulsion, and the impregnated filter material felt is squeezed with a squeezing margin of 115%, and then dried at a drying temperature of 190 ° C to obtain a gram weight of 340 g / m 2 Stiff filter media.

[0042] The stiff filter material is pleated with 45 pleats and a pleat depth of 28 mm to obtain a pleated filter material. The bandage is welded to the pleated filter material along the width direction, and then the pleated filter material is welded into a cylindrical structure. The seal of the bandage is welded and fixed, and metal end caps are installed at both ends of the cylindrical structure to obtain a composite filter material flame-retardant filter cartridge.

[0043] The impregnation emulsion uses the following raw materials in weight percentage: 35% triphenyl phosphate, 35% stiffening agent (Xinyi Synthesis LB827) and 30% water. The triphenyl phosphate, stiffening agent and water are evenly mixed to obtain the impregnation emulsion.

[0044] Example 2

[0045] The only difference between this embodiment and embodiment 1 is that the impregnation emulsion uses the following raw materials in weight percentage: 30% triphenyl phosphate, 30% stiffening agent (Xinyi Synthesis LB827) and 40% water. The triphenyl phosphate, stiffening agent and water are mixed uniformly to obtain the impregnation emulsion.

[0046] Example 3

[0047] The only difference between this embodiment and embodiment 1 is that the impregnation emulsion uses the following raw materials in weight percentage: 40% triphenyl phosphate, 40% stiffening agent (Xinyi Synthesis LB827) and 30% water. The triphenyl phosphate, stiffening agent and water are mixed uniformly to obtain the impregnation emulsion.

[0048] Example 4

[0049] The only difference between this embodiment and embodiment 1 is that the impregnated filter material felt is squeezed to a residual amount of 110%, and then dried at a drying temperature of 140°C to obtain a weight of 320 g / m 2 Stiff filter media.

[0050] Example 5

[0051] The only difference between this embodiment and embodiment 1 is that the impregnated filter material felt is squeezed to a residual amount of 120%, and then dried at a drying temperature of 240°C to obtain a weight of 360 g / m 2 Stiff filter media.

[0052] Example 6

[0053] The only difference between this embodiment and embodiment 1 is that the polyester fiber and the glass fiber are opened separately, and the polyester fiber and the glass fiber are mixed according to the following weight percentages: 40% polyester fiber and 60% glass fiber to obtain mixed fibers.

[0054] Example 7

[0055] The only difference between this embodiment and embodiment 1 is that the polyester fiber and the glass fiber are opened separately, and the polyester fiber and the glass fiber are mixed according to the following weight percentage: 50% polyester fiber and 50% glass fiber to obtain mixed fiber.

[0056] Example 8

[0057] The only difference between this embodiment and embodiment 1 is that the polyester fiber and the glass fiber are opened separately, and the polyester fiber and the glass fiber are mixed according to the following weight percentage: 80% polyester fiber and 20% glass fiber to obtain mixed fiber.

[0058] Example 9

[0059] The only difference between this embodiment and embodiment 1 is that the polyester fiber and the glass fiber are opened separately, and the polyester fiber and the glass fiber are mixed according to the following weight percentage: 90% polyester fiber and 10% glass fiber to obtain mixed fiber.

[0060] Example 10

[0061] This embodiment differs from Example 1 only in that the polyester fiber (Hangzhou Haoye W6005) is replaced with an equal amount of polyester fiber made from a modified polyester masterbatch. The modified polyester masterbatch uses the following raw materials in parts by weight: 75 kg of polyester masterbatch (YiSu YI-SER-1-8U), 7 kg of bromotriazine, 12 kg of polyamide, and 6 kg of paraffin oil. The polyester fiber is prepared using the following steps:

[0062] Polyester masterbatch, bromotriazine, polyamide and paraffin oil are weighed, mixed, and added into a melt blending device for melt blending to obtain a molten material, and the molten material is extruded and granulated to obtain a modified polyester masterbatch.

[0063] The polyester masterbatch is washed with water and dried, and the dried polyester masterbatch is added to a melt spinning machine for melting and spinning to form nascent fibers, which are then drawn and heat-set to obtain polyester fibers.

[0064] Example 11

[0065] The only difference between this embodiment and embodiment 10 is that the modified polyester masterbatch uses the following raw materials in parts by weight: 70 kg of polyester masterbatch (YiSu YI-SER-1-8U), 10 kg of bromotriazine, 13 kg of polyamide, and 7 kg of paraffin oil.

[0066] Example 12

[0067] The only difference between this embodiment and embodiment 10 is that the modified polyester masterbatch uses the following raw materials in parts by weight: 80 kg of polyester masterbatch (YiSu YI-SER-1-8U), 5 kg of bromotriazine, 10 kg of polyamide, and 5 kg of paraffin oil.

[0068] Example 13

[0069] The only difference between this embodiment and embodiment 10 is that the modified polyester masterbatch uses the following raw materials in parts by weight: 80 kg of polyester masterbatch (YiSu YI-SER-1-8U), 5 kg of bromotriazine, 5 kg of polyamide, 5 kg of paraffin oil, and 5 kg of hexamethylenediamine. The preparation method of polyester fiber adopts the following steps:

[0070] Polyester masterbatch, bromotriazine, polyamide, hexamethylenediamine and paraffin oil are weighed, mixed, and added into a melt blending device for melt blending to obtain a molten material, and the molten material is extruded and granulated to obtain a modified polyester masterbatch.

[0071] The polyester masterbatch is washed with water and dried, and the dried polyester masterbatch is added to a melt spinning machine for melting and spinning to form nascent fibers, which are then drawn and heat-set to obtain polyester fibers.

[0072] Example 14

[0073] The only difference between this embodiment and embodiment 10 is that the modified polyester masterbatch uses the following raw materials in parts by weight: 75 kg of polyester masterbatch (YiSu YI-SER-1-8U), 5 kg of bromotriazine, 5 kg of polyamide, 5 kg of paraffin oil, and 10 kg of hexamethylenediamine. The preparation method of the polyester fiber adopts the following steps:

[0074] Polyester masterbatch, bromotriazine, polyamide, hexamethylenediamine and paraffin oil are weighed, mixed, and added into a melt blending device for melt blending to obtain a molten material, and the molten material is extruded and granulated to obtain a modified polyester masterbatch.

[0075] The polyester masterbatch is washed with water and dried, and the dried polyester masterbatch is added to a melt spinning machine for melting and spinning to form nascent fibers, which are then drawn and heat-set to obtain polyester fibers.

[0076] Example 15

[0077] The only difference between this embodiment and embodiment 1 is that an equal amount of flame retardant (CADAN-88) is used to replace triphenyl phosphate.

[0078] Example 16

[0079] The only difference between this embodiment and Example 13 is that the stiffener (Xinyi Synthesis LB827) is replaced with an equal amount of a homemade stiffener, and the homemade stiffener includes the following raw materials: 78 kg of melamine, 15 kg of a polyurethane crosslinker (Youen Chemical UN-8098) and 7 kg of aluminum oxide.

[0080] Example 17

[0081] The only difference between this embodiment and Example 13 is that the stiffener (Xinyi Synthesis LB827) is replaced with an equal amount of a homemade stiffener, and the homemade stiffener includes the following raw materials: 70 kg of melamine, 20 kg of a polyurethane crosslinker (Youen Chemical UN-8098) and 10 kg of aluminum oxide.

[0082] Example 18

[0083] The only difference between this embodiment and Example 13 is that the stiffener (Xinyi Synthesis LB827) is replaced with an equal amount of a homemade stiffener, and the homemade stiffener includes the following raw materials: 85 kg of melamine, 10 kg of a polyurethane crosslinker (Youen Chemical UN-8098) and 5 kg of aluminum oxide.

[0084] Comparative Example

[0085] Comparative Example 1

[0086] The only difference between this comparative example and Example 1 is that the glass fiber (Rhodia SX218V50) is replaced by an equal amount of polyester fiber (Hangzhou Haoye W6005).

[0087] Comparative Example 2

[0088] The only difference between this comparative example and Example 1 is that the impregnation emulsion uses the following raw materials in weight percentage: 70% of stiffening agent (Xinyi Synthetic LB827) and 30% of water. The stiffening agent and water are mixed evenly to obtain an impregnation emulsion.

[0089] Comparative Example 3

[0090] The only difference between this comparative example and Example 1 is that the impregnation emulsion uses the following raw materials in weight percentage: 70% triphenyl phosphate and 30% water. The triphenyl phosphate and water are mixed evenly to obtain the impregnation emulsion.

[0091] Performance testing

[0092] The following performance tests were performed on the composite filter material flame-retardant filter cartridges prepared in Examples 1-16 and Comparative Examples 1-3:

[0093] According to GB / T2406.2-2009, the limiting oxygen index (LOI) / % of the composite filter material flame retardant filter cartridge is tested.

[0094] According to GB / T8627-2007, the smoke density rating (SDR) of the composite filter material flame retardant filter cartridge is tested.

[0095] According to GBT3923.1-1997, the breaking strength (N) of the composite filter material flame retardant filter cartridge is tested.

[0096] The test results are shown in Table 1.

[0097] Table 1

[0098]

[0099]

[0100] Combining Example 1 and Comparative Examples 1-3 and Table 1, it can be seen that compared with Example 1, the limiting oxygen index of Comparative Examples 1-3 is smaller, the smoke density level is larger, and the radial and latitudinal breaking strengths are both smaller. This shows that under the raw material ratio and process conditions of Example 1, it is helpful to improve the flame retardant properties of the filter material and the filter cartridge, and it can also improve the filter material strength and reduce the release of harmful gases.

[0101] Combining Examples 1-5 and Table 1, it can be seen that Examples 1-5 all have higher limiting oxygen index, radial and latitudinal breaking strength, and lower smoke density levels. This shows that within the range of the ratios and process conditions of Examples 1-5, it is helpful to improve the flame retardant properties and strength of the filter material and filter cartridge.

[0102] Combining Examples 1, 6-9 and Table 1, it can be seen that the radial and latitudinal breaking strengths of Example 6 are significantly reduced, the limiting oxygen index of Example 9 is significantly reduced and the smoke density level is increased, the limiting oxygen index of Examples 7-8 are all greater than 40%, the smoke density levels are all less than 30, and the radial and latitudinal breaking strengths are both large. This shows that using a weight ratio of 20-50% glass fiber and 50-80% polyester fiber helps to improve the flame retardant properties and strength of the filter material and filter cartridge at the same time.

[0103] Combining Examples 1, 10-15, and Table 1, it can be seen that compared to Example 1, Examples 10-14 have higher limiting oxygen indexes, radial and latitudinal breaking strengths, and lower smoke density ratings. However, Example 15 has lower limiting oxygen indexes, radial and latitudinal breaking strengths, and a higher smoke density rating. This demonstrates that, when using triphenyl phosphate, polyester fibers prepared from the modified polyester masterbatch of Examples 10-14 can further improve the flame retardancy and strength of filter media and filter cartridges.

[0104] Combining Examples 1, 16-18 and Table 1, it can be seen that compared with Example 1, Examples 16-18 have greater limiting oxygen index, radial and latitudinal breaking strength, and lower smoke density levels. This shows that the use of the homemade stiffening agent of Examples 16-18 helps to further improve the flame retardant properties and strength of the filter material and filter cartridge.

[0105] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A process for manufacturing a composite filter material flame retardant filter cartridge, characterized in that: The steps include: The polyester fiber and the glass fiber are opened separately, and the polyester fiber and the glass fiber are mixed to obtain a mixed fiber, wherein the weight percentage of the glass fiber in the mixed fiber is 20-50% and the weight percentage of the polyester fiber is 50-80%. Using the polyester cloth as a base fabric, the mixed fiber is carded, laid, combined and pre-needled to obtain a pre-needled felt; The pre-needled felt is subjected to a hydroentanglement reinforcement treatment to obtain a filter material felt; After the surface of the filter material felt is singed, it is immersed in the impregnation emulsion, and the impregnated filter material felt is squeezed and dried. The squeeze margin is 110-120%, and the drying temperature is 140℃-240℃ to obtain a gram weight of 340g / m 2 Stiff filter media; The stiff filter material is pleated to obtain pleated filter material, a band is welded to the pleated filter material along the width direction, the pleated filter material is then welded into a cylindrical structure, the sealing of the band is fixed by welding, and metal end caps are installed at both ends of the cylindrical structure to obtain a composite filter material flame retardant filter cartridge; The impregnation emulsion comprises the following raw materials in weight percentage: 30-40% triphenyl phosphate, 30-40% stiffening agent and 30-40% water; the stiffening agent comprises the following raw materials in weight parts: 70-85 parts melamine, 10-20 parts polyurethane crosslinking agent and 5-10 parts metal oxide; The polyester fiber is made of modified polyester masterbatch, which includes the following raw materials in parts by weight: 70-80 parts of polyester masterbatch, 5-10 parts of bromotriazine, 5-13 parts of polyamide, 5-7 parts of paraffin oil, and 5-10 parts of hexamethylenediamine.

2. The manufacturing process of a composite filter material flame retardant filter cartridge according to claim 1, characterized in that: The preparation method of the polyester fiber comprises the following steps: Weighing polyester masterbatch, bromotriazine, polyamide, hexamethylenediamine and paraffin oil, mixing and melt-blending to obtain a molten material, and extruding the molten material into granules to obtain a modified polyester masterbatch; The polyester masterbatch is cleaned and dried, and then added into a melt spinning machine for melting and spinning to form nascent fibers, which are then drawn and heat-set to obtain polyester fibers.

3. A composite filter material flame retardant filter cartridge, characterized in that: The composite filter material flame-retardant filter cartridge is made according to the manufacturing process of any one of claims 1-2.

Images