Composite filter material flame-retardant filter cartridge and manufacturing process thereof

Abstract

The invention relates to the technical field of high-temperature flue gas filtration, and particularly discloses a composite filter material flame-retardant filter cartridge and a manufacturing process thereof. The manufacturing process comprises the following steps: performing opening, mixing, carding, lapping, grid connection and pre-needling on polyester fibers and glass fibers to obtain a pre-needled felt; performing spunlace reinforcement treatment on the pre-needled felt to obtain a filter material plain felt; singeing the filter material plain felt, dipping the filter material plain felt in the dipping emulsion, mangling and drying to obtain a stiff filter material; pleating the stiff filter material, welding the stiff filter material into a barrel-shaped structure, welding a sealing opening of a fixing bandage, and mounting metal end covers at the two ends of the barrel-shaped structure to obtain the composite filter material flame-retardant filter barrel; the impregnating emulsion comprises the following raw materials in percentage by weight: 30-40% of a flame retardant, 30-40% of a stiffening agent and 30-40% of water. By adopting the steps of fiber compounding, dipping, mangling, drying and the like, the high temperature resistance and flame retardance of the filter material can be improved while the strength of the filter material is kept.

Description

Technical Field

[0001] The 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 the existing industrial dust collector is working, the dust-containing gas is filtered through the filter cartridge of the dust collector, so that the dust is blocked on the outside of the filter cartridge, and the exhaust gas is discharged from the inside of the filter cartridge after filtration. When the filter cartridge removes dust from the high-temperature flue gas that is often accompanied by sparks and static electricity, it is easy to cause combustion or even explosion, which seriously affects the safety of the dust collector. Therefore, it is necessary to improve the flame retardant performance of the filter cartridge.

[0003] The related art discloses a high temperature resistant stiffened needle felt filter material, which is provided with a base fabric layer and a high temperature resistant fiber layer, wherein the high temperature resistant fiber layer is provided on the base fabric layer, and the base fabric layer is connected with the high temperature resistant fiber layer by needle punching. The base fabric layer may be a base fabric layer made of at least one of aramid, polyphenylene sulfide, polyimide, glass fiber, etc. The high temperature resistant fiber layer may be a high temperature resistant fiber layer made of at least one of aramid, polyphenylene sulfide, polyimide, glass fiber, etc.

[0004] Although the fibers such as aramid, polyphenylene sulfide, polyimide, and glass fiber used in the above filter materials can withstand a certain high temperature, their flame retardant properties are relatively poor. Therefore, the above filter materials are difficult to be used to make 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, the polyester fiber and the glass fiber are mixed to obtain mixed fiber, and the mixed fiber is combed, laid, combined and pre-needled using the polyester cloth as the base cloth 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 a pleated filter material, a band is welded to the pleated filter material along the width direction, the pleated filter material is welded into a cylindrical structure, the sealing of the band 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;

[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 composite fiber of polyester fiber and glass fiber can maintain the strength of the filter material while making the filter material have certain high temperature resistance. The present application also uses the steps of impregnation, liquid rolling and drying to make the flame retardant and stiffening agent in the impregnated emulsion adhere to the surface of the filter material and penetrate into the inside 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 the composite filter material.

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

[0015] By adopting the above technical scheme, bromotriazine can decompose at high temperature to produce non-flammable gas, dilute the concentration of flammable gas, and promote the formation of a carbonized layer on the polymer surface. Polyamide can improve the mechanical properties and wear resistance of polyester. At the same time, polyamide and polyester have good compatibility, which helps to form a stable blending system. Paraffin oil can reduce the friction coefficient of the modified polyester masterbatch during processing and improve processing fluidity. Therefore, the use of bromotriazine, polyamide and paraffin oil to modify the polyester masterbatch can significantly improve the flame retardant properties of polyester and maintain the mechanical properties of polyester, thereby further improving the flame retardant properties of the filter material and filter cartridge.

[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 scheme, 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 and granulating the molten material to obtain a modified polyester masterbatch;

[0020] The polyester masterbatch is cleaned and dried, and added into a melt spinning machine for melting and spinning to form primary fibers, and the primary fibers are 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 therein, ensuring the stability of the spinning process. Drafting can improve the orientation and crystallinity of the fiber. During the drafting process, the structure of the polyester fiber is further stabilized by heat setting, thereby enhancing the mechanical properties of the polyester fiber.

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

[0023] By adopting the above technical solution, triphenyl phosphate has low volatility and good flame retardant properties, and can be quickly decomposed when the material burns to generate compounds such as phosphoric acid and phenol, which can capture free radicals in the flame and interrupt the combustion chain reaction, thereby improving the flame retardant properties of the filter material and the filter cartridge. In addition, the amino group of hexamethylenediamine can form a phosphorus-nitrogen bond with the phosphorus-oxygen bond in triphenyl phosphate, connecting triphenyl phosphate to the polyester molecule, thereby enhancing the impregnation effect, improving the adhesion of triphenyl phosphate, and further enhancing the flame retardant effect of the filter material and the filter cartridge.

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

[0025] By adopting the above technical scheme, melamine can decompose into non-flammable nitrogen at high temperature, diluting the oxygen concentration in the air, thereby playing a synergistic flame retardant role. At the same time, melamine can also react 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 crosslinking agent has good film-forming and adhesive properties, which helps to adhere triphenyl phosphate to the surface of the filter material and form a flame retardant film, thereby improving the flame retardant effect and durability of the filter material. Metal oxides can react with acidic substances such as phosphoric acid produced by the decomposition of triphenyl phosphate at high temperatures to form stable salt compounds, thereby reducing the release of harmful gases and improving the flame retardant properties of the filter material. At the same time, metal oxides can also enhance the thermal stability of the filter material.

[0026] In a specific embodiment, the impregnated filter material felt is squeezed and dried, the squeeze margin is 110-120%, and the drying temperature is 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 application has found through experiments that within the above rolling margin, drying temperature and gram weight range, the prepared composite filter material flame retardant filter cartridge has more excellent mechanical properties. Therefore, adopting the above process conditions is helpful 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 the 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 by adopting the manufacturing process of the composite filter material flame retardant filter cartridge.

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

[0033] 1. The present application adopts composite fibers and steps such as impregnation, liquid rolling and drying, thereby improving the high temperature resistance and flame retardancy of the filter material while maintaining the strength of the filter material.

[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 the filter cartridge. DETAILED DESCRIPTION

[0035] The present application is further described in detail below in conjunction with embodiments 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] The polyester fiber and the glass fiber are opened separately, and the polyester fiber (Hangzhou Haoye W6005) and the glass fiber (Rhodia SX218V50) are mixed according to the following weight percentages: 65% polyester fiber and 35% glass fiber to obtain mixed fiber. The mixed fiber is put into the cotton feeding box for combing, wherein the use parameters of the cotton feeding box are: the bottom conveyor belt is 1.5-2.0m / min, the corner nail curtain conveying speed is 10-15m / min, the cotton roller is 150-180m / min, and the stripping roller is 150-180m / min. Then it is transported to the carding machine, wherein the use parameters of the carding machine are: cotton doffer 20m / min, licker-in roller 400m / min, working roller 10m / min, stripping roller 150m / min, cylinder 800-1000m / min. Then it is sent to the web laying machine, where the parameters of the web laying machine are: the conveyor belt is stretched 105-110%, the web laying car is stretched 105-110%, polyester cloth is used as the base cloth, web laying and web joining are carried out, and then a pre-needling machine is used for pre-needling. The parameters of the acupuncture machine are: needle length 3.5mm, needle planting density 5000p / m, acupuncture depth 12-15mm, acupuncture 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 subjected to 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 squeeze surplus of 115%, and then dried at a drying temperature of 190°C to obtain a gram weight of 340 g / m 2 Stiff filter material.

[0042] The stiff filter material is pleated with 45 pleats and a pleat depth of 28 mm to obtain a pleated filter material, a binding tape is welded to the pleated filter material along the width direction, and then the pleated filter material is welded into a cylindrical structure, the sealing of the binding tape 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% stiffener (Xinyi Synthetic LB827) and 30% water. The triphenyl phosphate, stiffener and water are mixed evenly to obtain the impregnation emulsion.

[0044] Example 2

[0045] The 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 Synthetic LB827) and 40% water. The triphenyl phosphate, stiffening agent and water are uniformly mixed to obtain the impregnation emulsion.

[0046] Example 3

[0047] The 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 Synthetic LB827) and 30% water. The triphenyl phosphate, stiffening agent and water are uniformly mixed to obtain the impregnation emulsion.

[0048] Example 4

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

[0050] Example 5

[0051] The difference between this embodiment and embodiment 1 is that the impregnated filter material felt is squeezed with 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 material.

[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 percentage: 40% polyester fiber and 60% glass fiber to obtain mixed fiber.

[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] The only difference between this embodiment and embodiment 1 is that the polyester fiber (Hangzhou Haoye W6005) is replaced by 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 preparation method of the polyester fiber adopts the following steps:

[0062] Polyester masterbatch, brominated triazine, 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 then dried. The dried polyester masterbatch is added into a melt spinning machine for melting and spinning to form nascent fibers. The nascent fibers are then drawn and heat-set to obtain polyester fibers.

[0064] Embodiment 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 brominated triazine, 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 brominated triazine, 10 kg of polyamide, and 5 kg of paraffin oil.

[0068] Embodiment 13

[0069] The 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 then dried. The dried polyester masterbatch is added into a melt spinning machine for melting and spinning to form nascent fibers. The nascent fibers are then drawn and heat-set to obtain polyester fibers.

[0072] Embodiment 14

[0073] The 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 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 then dried. The dried polyester masterbatch is added into a melt spinning machine for melting and spinning to form nascent fibers. The nascent fibers are then drawn and heat-set to obtain polyester fibers.

[0076] Embodiment 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 embodiment 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 crosslinking agent (Youn Chemical UN-8098) and 7 kg of aluminum oxide.

[0080] Embodiment 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 crosslinking agent (Youn Chemical UN-8098) and 10 kg of alumina.

[0082] Embodiment 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 crosslinking agent (Youn 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 difference between this comparative example and Example 1 is that the impregnation emulsion uses the following raw materials in weight percentage: 70% of stiffener (Xinyi Synthetic LB827) and 30% of water. The stiffener and water are mixed evenly to obtain the impregnation emulsion.

[0089] Comparative Example 3

[0090] The 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, test the breaking strength (N) of the composite filter material flame retardant filter cartridge.

[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 becomes smaller, the smoke density level becomes larger, and the radial and latitudinal breaking strengths are both reduced. 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 can also improve the strength of the filter material and reduce the release of harmful gases.

[0101] It can be seen from Examples 1-5 and Table 1 that Examples 1-5 all have higher limiting oxygen index, radial and latitudinal breaking strength, and lower smoke density levels, which indicates that within the range of the proportions and process conditions of Examples 1-5, they are all helpful in improving 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 is greater than 40%, the smoke density level is less than 30, and the radial and latitudinal breaking strengths are both relatively large, which shows that the use of 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 the filter cartridge at the same time.

[0103] Combining Examples 1, 10-15 and Table 1, it can be seen that compared with Example 1, Examples 10-14 have greater limiting oxygen index, radial and latitudinal breaking strength, and lower smoke density levels, but Example 15 has lower limiting oxygen index, radial and latitudinal breaking strength, and higher smoke density levels. This shows that in the case of using triphenyl phosphate, the polyester fiber prepared by using the modified polyester masterbatch of Examples 10-14 is helpful to further improve the flame retardant performance and strength of the filter material and the filter cartridge.

[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 smaller smoke density levels, which indicates that the use of the homemade stiffener of Examples 16-18 can help 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 modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

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, the polyester fiber and the glass fiber are mixed to obtain mixed fiber, and the mixed fiber is combed, laid, combined and pre-needled using the polyester cloth as the base cloth to obtain a pre-needled felt; The pre-needled felt is subjected to a hydroentanglement reinforcement treatment to obtain a filter material felt; 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; The stiff filter material is pleated to obtain a pleated filter material, a band is welded to the pleated filter material along the width direction, the pleated filter material is welded into a cylindrical structure, the sealing of the band 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; 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.

2. The manufacturing process of a composite filter material flame retardant filter cartridge according to claim 1, characterized in that: 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 brominated triazine, 5-13 parts of polyamide, and 5-7 parts of paraffin oil.

3. The manufacturing process of a composite filter material flame retardant filter cartridge according to claim 2, characterized in that: The modified polyester masterbatch further comprises the following raw materials in parts by weight: 5-10 parts of hexamethylenediamine.

4. The manufacturing process of a composite filter material flame-retardant filter cartridge according to claim 3, characterized in that: The method for preparing 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 and granulating the molten material to obtain a modified polyester masterbatch; The polyester masterbatch is cleaned and dried, and added into a melt spinning machine for melting and spinning to form primary fibers, and the primary fibers are drawn and heat-set to obtain polyester fibers.

5. The manufacturing process of a composite filter material flame retardant filter cartridge according to claim 4, characterized in that: The flame retardant is triphenyl phosphate.

6. The manufacturing process of a composite filter material flame retardant filter cartridge according to claim 1, characterized in that: The stiffening agent comprises the following raw materials in parts by weight: 70-85 parts of melamine, 10-20 parts of a polyurethane crosslinking agent and 5-10 parts of a metal oxide.

7. The manufacturing process of a composite filter material flame-retardant filter cartridge according to claim 1, characterized in that: When the impregnated filter material felt is rolled and dried, the rolling surplus is 110-120%, and the drying temperature is 140℃-240℃ to obtain a stiff filter material with a gram weight of 320-360g / m 2 .

8. The manufacturing process of a composite filter material flame-retardant filter cartridge according to claim 1, characterized in that: In the mixed fiber, the weight percentage of glass fiber is 20-50%, and the weight percentage of polyester fiber is 50-80%.

9. A composite filter material flame retardant filter cartridge, characterized in that: The composite filter material flame-retardant filter cartridge is manufactured according to the manufacturing process of any one of claims 1 to 8.

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