Impact-resistant filter canister material based on recycled abs and method of making the same

Abstract

The application discloses a recycled ABS-based impact-resistant filter canister material and a preparation method thereof, and belongs to the technical field of recycled ABS materials. The preparation method of the recycled ABS-based impact-resistant filter canister material comprises the following steps: step one: sorting, cleaning, drying, crushing and separating waste safety helmets and other waste protective articles containing ABS components, and then performing density separation to obtain pure ABS fragments; crushing, washing, centrifugal dewatering, electrostatic separation and recycling of the ABS base material; step two: mixing the recycled ABS base material, a composite corrosion-resistant agent and a modified impact-resistant agent, then adding an antioxidant and a lubricant, uniformly mixing, melting, filtering, extruding, drying, injection molding, shaping, passivating and obtaining the recycled ABS-based impact-resistant filter canister material. The material prepared by the method has excellent corrosion resistance, impact resistance and thermal stability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of recycling ABS materials, and particularly relates to an impact-resistant filter box material based on recycled ABS and a preparation method thereof. BACKGROUND

[0002] In the field of protective equipment, the filter box as the core component of the gas mask directly determines the reliability and service life of the protective equipment. Traditional filter boxes are mostly made of engineering plastics or metal substrates, but such materials face the dual challenges of insufficient corrosion resistance and weakened impact resistance under complex working conditions. Taking ABS (acrylonitrile-butadiene-styrene) substrate as an example, although the original ABS material has certain acid and alkali resistance due to the acrylonitrile component, and the butadiene rubber phase gives it toughening properties, the comprehensive performance is excellent, but the recycled ABS material is degraded due to thermal oxidation, decomposition of bromine-based flame retardants, and precipitation of small molecules, resulting in molecular chain degradation and impurity mixing, and the material surface is prone to form micro-cracks and pores, and the chemical corrosion resistance is significantly reduced. When exposed to corrosive environments such as chlorine-containing disinfectants, organic solvents or industrial waste gas, corrosive media such as chloride ions and hydroxide ions will penetrate through the cracks to the inside of the material, causing stress corrosion cracking; at the same time, the crosslinking degree of the butadiene rubber phase in the recycled ABS decreases due to thermal shear, the material toughness decreases, and the impurities such as metal debris and coating residues mixed in will form stress concentration points, which will cause brittle fracture under impact load, and if the filter box shell in the industrial protection scene uses unmodified recycled ABS, its impact resistance will be greatly weakened when it encounters accidental falling or mechanical impact, and it cannot meet the requirements of relevant standards, increasing the risk of protection failure.

[0003] Patent CN118085494B discloses a tensile and impact-resistant ABS resin composite material and its preparation method, comprising the following raw materials in parts by weight: 80-85 parts by weight of ABS resin, 15-40 parts by weight of toughening and reinforcing ABS masterbatch composite, 2-4 parts by weight of compatibilizer, 0.5-1.0 parts by weight of composite antioxidant, and 0.2-0.5 parts by weight of lubricant; the toughening and reinforcing ABS masterbatch composite includes at least a first toughening and reinforcing ABS masterbatch and a second toughening and reinforcing ABS masterbatch; the first toughening and reinforcing ABS masterbatch comprises a surface-modified aramid fiber composition and ABS resin; the second toughening and reinforcing ABS masterbatch comprises a surface-modified functional filler and ABS resin. The resulting ABS resin composite material not only has excellent mechanical strength but also good impact toughness. Although the mechanical strength and impact toughness are improved through formulation design using toughening and reinforcing ABS masterbatch composite, compatibilizer, etc., there is still room for improvement in its impact resistance and corrosion resistance. On the one hand, although surface-modified aramid fibers and functional fillers are used for toughening, the uniformity of fiber and filler dispersion and interfacial bonding strength in the ABS matrix may be limited, potentially leading to localized stress concentration under extreme impact conditions. On the other hand, while composite antioxidants can delay thermo-oxidative aging, their long-term resistance to corrosive media such as chloride ions and organic solvents is insufficient, especially in high-temperature and high-humidity environments where corrosive media can easily penetrate. If applied to filter cartridge materials, in complex industrial or medical settings, insufficient impact resistance may lead to shell breakage upon accidental drops, or poor corrosion resistance may cause the sealing structure to fail, thus threatening safety. Summary of the Invention

[0004] The purpose of this invention is to provide an impact-resistant filter cartridge material based on recycled ABS and its preparation method, in order to solve the technical problem of poor impact resistance and corrosion resistance of recycled ABS materials in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a method for preparing an impact-resistant filter cartridge material based on recycled ABS, comprising the following steps:

[0007] Step 1: The recycled waste safety helmets and other waste protective equipment containing ABS components are sorted, cleaned, dried, crushed and separated, and then density sorted to obtain pure ABS fragments, which are then crushed, washed, centrifuged and dehydrated, and electrostatically sorted to obtain recycled ABS base material.

[0008] Step 2: Mix the recycled ABS substrate, composite corrosion resistant agent and modified impact resistant agent, then add antioxidant and lubricant. After mixing evenly, melt, filter, extrude, dry, injection mold, shape and passivate to obtain an impact resistant filter cartridge material based on recycled ABS.

[0009] Preferably, the preparation method of the composite corrosion resistant agent includes the following steps:

[0010] Q1: Add norborneol olefinic anhydride and chitosan to a container containing acetic acid, stir well, reflux the reaction, after the reaction is complete, extract, wash, distill under reduced pressure, filter, concentrate, purify, and obtain organic compound 1.

[0011] Q2: Organic compound 1, potassium carbonate and dimethyl sulfoxide were added to a container in sequence. The mixture was stirred at room temperature under argon atmosphere. Then 1,2-dibromotetrafluoroethane was added. The mixture was sealed, heated and stirred. The mixture was extracted, washed, and the solvent was removed under reduced pressure. The residue was added dropwise to a mixture of zinc and acetonitrile under reflux conditions. The mixture was heated and stirred. After the reaction was completed, the mixture was filtered, concentrated under reduced pressure, and purified to obtain organic compound 2.

[0012] Q3: Under argon atmosphere, organic compound 2 is added to a container containing dichloromethane, then Grubbs II reagent is added to dichloromethane, stirred and dissolved, then added dropwise to the container, reacted at room temperature, then ethyl vinyl ether is added dropwise, stirred and reacted, precipitated, filtered, and dried to obtain a composite corrosion resistant agent.

[0013] The synthesis reaction formula for the composite corrosion resistant agent in the above process is as follows:

[0014]

[0015] Preferably, in Q1, the ratio of norborneol adipic anhydride, chitosan and acetic acid is (1.64-2.05) g: (1.61-1.98) g: (120-150) mL, and the reflux reaction time is 8-10 h.

[0016] Preferably, in Q2, the ratio of organic compound 1, potassium carbonate, dimethyl sulfoxide, 1,2-dibromotetrafluoroethane, zinc, and acetonitrile is (1-1.6) g : (0.541-0.823) g : (13-20) mL : (1.21-1.87) g : (0.255-0.323) g : (10-18) mL, the stirring time at room temperature is 30-45 min, the heating and stirring reaction temperature is 98-102℃, the reaction time is 20-28 h, and the heating and stirring temperature is 88-92℃.

[0017] Preferably, in Q3, the ratio of organic compound 2, Grubbs II reagent and ethyl vinyl ether is (1.5-2.1) g : (0.038-0.045) g : (0.15-0.22) mL, the reaction time at room temperature is 4-6 h, and the stirring reaction time is 30-45 min.

[0018] Preferably, the preparation method of the modified impact-resistant agent includes the following steps:

[0019] S1: Add perfluoropolyether carboxylic acid to a container, then add methyl nonafluorobutyl ether and oxalyl chloride, mix well, heat and stir under an argon atmosphere, stir and reflux to react, after the reaction is completed, heat and rotary evaporate to obtain intermediate a;

[0020] S2: Intermediate a and 4,4'-diaminodiphenyl disulfide were added sequentially to a container, followed by triethylamine. The mixture was stirred and reacted. After the reaction was completed, the mixture was rotary evaporated, washed, and vacuum dried to obtain the modified impact-resistant agent.

[0021] The synthesis reaction formula for the modified impact-resistant agent in the above process is as follows:

[0022]

[0023] Preferably, in S1, the ratio of perfluoropolyether carboxylic acid, methyl nonafluorobutyl ether and oxaloyl chloride is (6.8-10.2) g : (20.2-25.6) g : (5-7.5) mL, the heating and stirring temperature is 50-60℃, the reflux reaction time is 10-12 h, and the rotary evaporation temperature is 60-65℃.

[0024] Preferably, in S2, the ratio of intermediate a, 4,4'-diaminodiphenyl disulfide and triethylamine is (9.25-11.31) g: (2.23-2.58) g: (0.2-0.27) g, the stirring reaction time is 6-8 h, the rotary evaporation temperature is 88-92 °C, and the vacuum drying time is 10-12 h.

[0025] Preferably, in step one, a sodium chloride aqueous solution of 5.17-10.71 g / mL is used during the density sorting process to break the material to 10-40 mm; in step two, the ratio of the amount of recycled ABS substrate, composite corrosion resistant agent, modified impact resistant agent, antioxidant and lubricant is (85-90) g: (5-8) g: (1-4) g: (0.2-0.5) g: (0.3-0.5) g.

[0026] The above-described preparation method was used to prepare an impact-resistant filter cartridge material based on recycled ABS.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0028] 1. The present invention adds the prepared composite corrosion resistant agent and modified impact resistant agent to the preparation process of the impact resistant filter cartridge material based on recycled ABS, which can effectively improve the corrosion resistance, impact resistance and thermal stability of the material.

[0029] 2. In the preparation process of the filter cartridge material, the addition of a composite corrosion resistant agent can effectively improve its corrosion resistance, impact resistance, and thermal stability. The fluorine contained in the composite corrosion resistant agent can form a hydrophobic structure on the material surface through self-assembly, reducing the contact between the corrosive medium and the substrate. The cross-linked network formed by the composite corrosion resistant agent inhibits the propagation of microcracks through the "crack pinning" effect. The flexible segments of chitosan can absorb impact energy, improving the impact resistance of the material. In addition, the high electronegativity of fluorine atoms can induce the redistribution of electron cloud density of adjacent carbon-carbon bonds, forming an electron shielding layer, which significantly reduces the generation of free radicals during thermal oxidation and improves the thermal stability of the material.

[0030] 3. In the preparation process of filter cartridge materials, the modified impact-resistant agent added to the filter cartridge material can effectively improve its impact resistance, corrosion resistance and thermal stability. The disulfide bonds contained in the modified impact-resistant agent can absorb impact energy through a dynamic breaking-recombination mechanism to form "sacrificial bonds". At the same time, the rubbery flexible segments of perfluoropolyether form a micro-dispersion structure in the material, which consumes energy through molecular chain slip and conformation adjustment, thereby improving the impact resistance of the material. The perfluoropolyether segments contained in the modified impact-resistant agent self-assemble to form a hydrophobic barrier layer, which blocks the penetration of corrosive media. The high bond energy of carbon-fluorine bonds can also resist the erosion of oxidizing media and improve its corrosion resistance. The presence of fluorine atoms and polyamide structure can also improve the thermal stability of the material. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1: This example discloses a method for preparing a composite corrosion resistant agent, including the following steps:

[0033] Q1: Add 1.85g norborneol edible anhydride and 1.74g chitosan to a container containing 135mL acetic acid, stir well, reflux for 8h, after the reaction is complete, extract, wash, distill under reduced pressure, filter, concentrate, purify, and obtain organic compound 1.

[0034] Q2: 1.3g of organic compound 1, 0.682g of potassium carbonate and 16.5mL of dimethyl sulfoxide were added sequentially to a container. The mixture was stirred at room temperature for 45min under argon atmosphere. Then, 1.54g of 1,2-dibromotetrafluoroethane was added. The mixture was sealed and heated and stirred at 100℃ for 24h. The mixture was extracted, washed, and the solvent was removed under reduced pressure. The residue was added dropwise to a mixture of 0.284g of zinc and 14mL of acetonitrile under reflux. The mixture was heated and stirred at 90℃. After the reaction was completed, the mixture was filtered, concentrated under reduced pressure, and purified to obtain organic compound 2.

[0035] Q3: Under argon atmosphere, 1.8g of organic compound 2 was added to a container containing 3mL of dichloromethane. Then, 0.041g of Grubbs II reagent was added to 1mL of dichloromethane. After stirring and dissolving, the solution was added dropwise to the container. After reacting at room temperature for 4 hours, 0.18mL of ethyl vinyl ether was added dropwise. The mixture was stirred and reacted for 30 minutes. After sedimentation, the mixture was filtered and dried to obtain the composite corrosion resistant agent.

[0036] This embodiment discloses a method for preparing a modified impact-resistant agent, including the following steps:

[0037] S1: Add 8.5g of perfluoropolyether carboxylic acid to a container, then add 22.4g of methyl nonafluorobutyl ether and 6.25mL of oxaloyl chloride. After mixing evenly, heat and stir at 55°C under an argon atmosphere for 12 hours. After the reaction is completed, heat at 65°C to evaporate by rotary evaporation to obtain intermediate a.

[0038] S2: 10.73g of intermediate a and 2.45g of 4,4'-diaminodiphenyl disulfide were added sequentially to a container, followed by 0.23g of triethylamine. The mixture was stirred and reacted for 6 hours. After the reaction was completed, the mixture was rotary evaporated at 90°C, washed, and vacuum dried for 12 hours to obtain the modified impact-resistant agent.

[0039] This embodiment discloses a method for preparing an impact-resistant filter cartridge material based on recycled ABS, including the following steps:

[0040] Step 1: The recycled waste safety helmets and other waste protective equipment containing ABS components are sorted, cleaned, dried, crushed and separated, and then density sorted (using 8.82g / mL sodium chloride aqueous solution) to obtain pure ABS fragments, which are crushed to 25mm, washed, centrifuged and dehydrated, and electrostatically sorted to obtain recycled ABS base material.

[0041] Step 2: Mix 88.5g of recycled ABS substrate, 6.5g of composite corrosion resistant agent and 2.5g of modified impact resistant agent at 800rpm, then add 0.35g of antioxidant and 0.4g of lubricant, mix evenly at 900rpm, melt at 200℃, filter through a 120-mesh filter, extrude, dry, injection mold, shape, and passivate to obtain an impact-resistant filter cartridge material based on recycled ABS.

[0042] Example 2: This example discloses a method for preparing a composite corrosion resistant agent, including the following steps:

[0043] Q1: Add 1.64g norborneol edible anhydride and 1.61g chitosan to a container containing 120mL acetic acid, stir well, reflux for 8h, after the reaction is complete, extract, wash, distill under reduced pressure, filter, concentrate, purify, and obtain organic compound 1.

[0044] Q2: 1.6g of organic compound 1, 0.541g of potassium carbonate and 13mL of dimethyl sulfoxide were added sequentially to a container. The mixture was stirred at room temperature for 45min under argon atmosphere. Then, 1.21g of 1,2-dibromotetrafluoroethane was added. The mixture was sealed and heated and stirred at 100℃ for 24h. The mixture was extracted, washed, and the solvent was removed under reduced pressure. The residue was added dropwise to a mixture of 0.255g of zinc and 10mL of acetonitrile under reflux. The mixture was heated and stirred at 90℃. After the reaction was completed, the mixture was filtered, concentrated under reduced pressure, and purified to obtain organic compound 2.

[0045] Q3: Under argon atmosphere, add 1.5g of organic compound 2 to a container containing 3mL of dichloromethane, then add 0.038g of Grubbs II reagent to 1mL of dichloromethane. After stirring and dissolving, add the solution dropwise to the container. After reacting at room temperature for 4h, add 0.15mL of ethyl vinyl ether. Stir and react for 30min. After sedimentation, filter and dry to obtain the composite corrosion resistant agent.

[0046] This embodiment discloses a method for preparing a modified impact-resistant agent, including the following steps:

[0047] S1: Add 6.8g of perfluoropolyether carboxylic acid to a container, then add 20.2g of methyl nonafluorobutyl ether and 5mL of oxaloyl chloride. After mixing evenly, heat and stir at 55°C under an argon atmosphere for 12 hours. After the reaction is completed, heat at 65°C to evaporate by rotary evaporation to obtain intermediate a.

[0048] S2: 9.25g of intermediate a and 2.23g of 4,4'-diaminodiphenyl disulfide were added to a container in sequence, followed by 0.27g of triethylamine. The mixture was stirred and reacted for 6 hours. After the reaction was completed, the mixture was rotary evaporated at 90°C, washed, and vacuum dried for 12 hours to obtain the modified impact-resistant agent.

[0049] This embodiment discloses a method for preparing an impact-resistant filter cartridge material based on recycled ABS, including the following steps:

[0050] Step 1: The recycled waste safety helmets and other waste protective equipment containing ABS components are sorted, cleaned, dried, crushed and separated, and then density sorted (using 8.82g / mL sodium chloride aqueous solution) to obtain pure ABS fragments, which are crushed to 25mm, washed, centrifuged and dehydrated, and electrostatically sorted to obtain recycled ABS base material.

[0051] Step 2: Mix 85g of recycled ABS substrate, 5g of composite corrosion resistant agent and 1g of modified impact resistant agent at 800rpm, then add 0.2g of antioxidant and 0.5g of lubricant, mix evenly at 900rpm, melt at 200℃, filter through a 120-mesh filter, extrude, dry, injection mold, shape, and passivate to obtain an impact-resistant filter cartridge material based on recycled ABS.

[0052] Example 3: This example discloses a method for preparing a composite corrosion resistant agent, including the following steps:

[0053] Q1: Add 2.05g norborneol edible anhydride and 1.98g chitosan to a container containing 150mL acetic acid, stir well, reflux for 8h, after the reaction is complete, extract, wash, distill under reduced pressure, filter, concentrate, purify, and obtain organic compound 1.

[0054] Q2: 1g of organic compound 1, 0.823g of potassium carbonate and 20mL of dimethyl sulfoxide were added sequentially to a container. The mixture was stirred at room temperature for 45min under argon atmosphere. Then, 1.87g of 1,2-dibromotetrafluoroethane was added. The mixture was sealed and heated and stirred at 100℃ for 24h. The mixture was extracted, washed, and the solvent was removed under reduced pressure. The residue was added dropwise to a mixture of 0.323g of zinc and 18mL of acetonitrile under reflux conditions. The mixture was heated and stirred at 90℃. After the reaction was completed, the mixture was filtered, concentrated under reduced pressure, and purified to obtain organic compound 2.

[0055] Q3: Under argon atmosphere, add 2.1g of organic compound 2 to a container containing 3mL of dichloromethane, then add 0.045g of Grubbs II reagent to 1mL of dichloromethane. After stirring and dissolving, add the solution dropwise to the container. After reacting at room temperature for 4h, add 0.22mL of ethyl vinyl ether. Stir and react for 30min. After sedimentation, filter, and dry to obtain the composite corrosion resistant agent.

[0056] This embodiment discloses a method for preparing a modified impact-resistant agent, including the following steps:

[0057] S1: Add 10.2g of perfluoropolyether carboxylic acid to a container, then add 25.6g of methyl nonafluorobutyl ether and 7.5mL of oxaloyl chloride. After mixing evenly, heat and stir at 55°C under an argon atmosphere for 12 hours. After the reaction is completed, heat at 65°C to evaporate by rotary evaporation to obtain intermediate a.

[0058] S2: 11.31g of intermediate a and 2.58g of 4,4'-diaminodiphenyl disulfide were added sequentially to a container, followed by 0.2g of triethylamine. The mixture was stirred and reacted for 6 hours. After the reaction was completed, the mixture was rotary evaporated at 90°C, washed, and vacuum dried for 12 hours to obtain the modified impact-resistant agent.

[0059] This embodiment discloses a method for preparing an impact-resistant filter cartridge material based on recycled ABS, including the following steps:

[0060] Step 1: The recycled waste safety helmets and other waste protective equipment containing ABS components are sorted, cleaned, dried, crushed and separated, and then density sorted (using 8.82g / mL sodium chloride aqueous solution) to obtain pure ABS fragments, which are crushed to 25mm, washed, centrifuged and dehydrated, and electrostatically sorted to obtain recycled ABS base material.

[0061] Step 2: Mix 90g of recycled ABS substrate, 8g of composite corrosion resistant agent and 4g of modified impact resistant agent at 800rpm, then add 0.5g of antioxidant and 0.3g of lubricant, mix evenly at 900rpm, melt at 200℃, filter through a 120-mesh filter, extrude, dry, injection mold, shape, and passivate to obtain an impact-resistant filter cartridge material based on recycled ABS.

[0062] Example 4: This example discloses a method for preparing a composite corrosion resistant agent, including the following steps:

[0063] Q1: Add 1.71g norborneol edible anhydride and 1.68g chitosan to a container containing 130mL acetic acid, stir well, reflux for 8h, after the reaction is complete, extract, wash, distill under reduced pressure, filter, concentrate, purify, and obtain organic compound 1.

[0064] Q2: 1.2g of organic compound 1, 0.571g of potassium carbonate and 15mL of dimethyl sulfoxide were added sequentially to a container. The mixture was stirred at room temperature for 45min under argon atmosphere. Then, 1.38g of 1,2-dibromotetrafluoroethane was added. The mixture was sealed and heated and stirred at 100℃ for 24h. The mixture was extracted, washed, and the solvent was removed under reduced pressure. The residue was added dropwise to a mixture of 0.271g of zinc and 12mL of acetonitrile under reflux. The mixture was heated and stirred at 90℃. After the reaction was completed, the mixture was filtered, concentrated under reduced pressure, and purified to obtain organic compound 2.

[0065] Q3: Under argon atmosphere, 1.6g of organic compound 2 was added to a container containing 3mL of dichloromethane. Then, 0.039g of Grubbs II reagent was added to 1mL of dichloromethane. After stirring and dissolving, the solution was added dropwise to the container. After reacting at room temperature for 4 hours, 0.17mL of ethyl vinyl ether was added dropwise. The mixture was stirred and reacted for 30 minutes. After sedimentation, the mixture was filtered and dried to obtain the composite corrosion resistant agent.

[0066] This embodiment discloses a method for preparing a modified impact-resistant agent, including the following steps:

[0067] S1: Add 7.4g of perfluoropolyether carboxylic acid to a container, then add 21.7g of methyl nonafluorobutyl ether and 5.8mL of oxaloyl chloride. After mixing evenly, heat and stir at 55°C under an argon atmosphere for 12 hours. After the reaction is completed, heat at 65°C to evaporate by rotary evaporation to obtain intermediate a.

[0068] S2: 9.97g of intermediate a and 2.36g of 4,4'-diaminodiphenyl disulfide were added sequentially to a container, followed by 0.21g of triethylamine. The mixture was stirred and reacted for 6 hours. After the reaction was completed, the mixture was rotary evaporated at 90°C, washed, and vacuum dried for 12 hours to obtain the modified impact-resistant agent.

[0069] This embodiment discloses a method for preparing an impact-resistant filter cartridge material based on recycled ABS, including the following steps:

[0070] Step 1: The recycled waste safety helmets and other waste protective equipment containing ABS components are sorted, cleaned, dried, crushed and separated, and then density sorted (using 8.82g / mL sodium chloride aqueous solution) to obtain pure ABS fragments, which are crushed to 25mm, washed, centrifuged and dehydrated, and electrostatically sorted to obtain recycled ABS base material.

[0071] Step 2: Mix 86g of recycled ABS substrate, 7g of composite corrosion resistant agent and 2g of modified impact resistant agent at 800rpm, then add 0.22g of antioxidant and 0.35g of lubricant, mix evenly at 900rpm, melt at 200℃, filter through a 120-mesh filter, extrude, dry, injection mold, shape, and passivate to obtain an impact-resistant filter cartridge material based on recycled ABS.

[0072] Example 5: This example discloses a method for preparing a composite corrosion resistant agent, including the following steps:

[0073] Q1: Add 1.93g norborneol adipic anhydride and 1.83g chitosan to a container containing 140mL acetic acid, stir well, reflux for 8h, after the reaction is complete, extract, wash, distill under reduced pressure, filter, concentrate, purify, and obtain organic compound 1.

[0074] Q2: 1.5g of organic compound 1, 0.717g of potassium carbonate and 19mL of dimethyl sulfoxide were added sequentially to a container. The mixture was stirred at room temperature for 45min under argon atmosphere. Then, 1.72g of 1,2-dibromotetrafluoroethane was added. The mixture was sealed and heated and stirred at 100℃ for 24h. The mixture was extracted, washed, and the solvent was removed under reduced pressure. The residue was added dropwise to a mixture of 0.312g of zinc and 16mL of acetonitrile under reflux. The mixture was heated and stirred at 90℃. After the reaction was completed, the mixture was filtered, concentrated under reduced pressure, and purified to obtain organic compound 2.

[0075] Q3: Under argon atmosphere, add 2.01g of organic compound 2 to a container containing 3mL of dichloromethane, then add 0.042g of Grubbs II reagent to 1mL of dichloromethane. After stirring and dissolving, add the solution dropwise to the container. After reacting at room temperature for 4h, add 0.21mL of ethyl vinyl ether. Stir and react for 30min. After sedimentation, filter, and dry, obtain the composite corrosion resistant agent.

[0076] This embodiment discloses a method for preparing a modified impact-resistant agent, including the following steps:

[0077] S1: Add 9.2g of perfluoropolyether carboxylic acid to a container, then add 24.2g of methyl nonafluorobutyl ether and 7.2mL of oxaloyl chloride. After mixing evenly, heat and stir at 55°C under an argon atmosphere for 12 hours. After the reaction is completed, heat at 65°C to evaporate by rotary evaporation to obtain intermediate a.

[0078] S2: 11.02 g of intermediate a and 2.49 g of 4,4'-diaminodiphenyl disulfide were added sequentially to a container, followed by 0.25 g of triethylamine. The mixture was stirred and reacted for 6 h. After the reaction was completed, the mixture was rotary evaporated at 90 °C, washed, and vacuum dried for 12 h to obtain the modified impact-resistant agent.

[0079] This embodiment discloses a method for preparing an impact-resistant filter cartridge material based on recycled ABS, including the following steps:

[0080] Step 1: The recycled waste safety helmets and other waste protective equipment containing ABS components are sorted, cleaned, dried, crushed and separated, and then density sorted (using 8.82g / mL sodium chloride aqueous solution) to obtain pure ABS fragments, which are crushed to 25mm, washed, centrifuged and dehydrated, and electrostatically sorted to obtain recycled ABS base material.

[0081] Step 2: Mix 89g of recycled ABS substrate, 6g of composite corrosion resistant agent and 3g of modified impact resistant agent at 800rpm, then add 0.4g of antioxidant and 0.45g of lubricant, mix evenly at 900rpm, melt at 200℃, filter through a 120-mesh filter, extrude, dry, injection mold, shape, and passivate to obtain an impact-resistant filter cartridge material based on recycled ABS.

[0082] Comparative Example 1: Compared with Example 1, Comparative Example 1 did not add composite corrosion resistant agent in the process of preparing the impact-resistant filter cartridge material based on recycled ABS, and all other conditions remained unchanged.

[0083] Comparative Example 2: Compared with Example 1, Comparative Example 2 did not add any modified impact-resistant agent during the preparation of the impact-resistant filter cartridge material based on recycled ABS, and all other conditions remained unchanged.

[0084] The impact-resistant filter cartridge materials based on recycled ABS prepared in Examples 1-5 and Comparative Examples 1-2 were subjected to performance tests. The corrosion resistance of the samples was tested according to GB / T 11547-2008, the thermal stability was tested according to GB / T 40006.5-2021, and the impact strength was tested according to GB / T 1843-2008. The test results are shown in Table 1.

[0085] Table 1

[0086]

[0087] After treatment with different solutions, the smaller the mass loss rate of the sample, the better its corrosion resistance; the higher the glass transition temperature, the better the thermal stability of the sample. Table 1 shows that the filter cartridge material with excellent corrosion resistance, impact resistance, and thermal stability was prepared using the methods of Examples 1-5. A comparison between Comparative Example 1 and Examples 1-5 reveals that adding a composite corrosion resistant agent can effectively improve the corrosion resistance, impact resistance, and thermal stability of the material; a comparison between Comparative Example 2 and Examples 1-5 reveals that adding a modified impact resistant agent can effectively improve the corrosion resistance, impact resistance, and thermal stability of the material.

[0088] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0089] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing an impact-resistant filter cartridge material based on recycled ABS, characterized in that, Includes the following steps: Step 1: The recycled waste safety helmets and other waste protective equipment containing ABS components are sorted, cleaned, dried, crushed and separated, and then density sorted to obtain pure ABS fragments, which are then crushed, washed, centrifuged and dehydrated, and electrostatically sorted to obtain recycled ABS base material. Step 2: Mix the recycled ABS substrate, composite corrosion resistant agent and modified impact resistant agent, then add antioxidant and lubricant, mix evenly, melt, filter, extrude, dry, injection mold, shape and passivate to obtain the impact resistant filter cartridge material based on recycled ABS. The preparation method of the composite corrosion resistant agent includes the following steps: Q1: Add norborneol olefinic anhydride and chitosan to a container containing acetic acid, stir well, reflux the reaction, after the reaction is complete, extract, wash, distill under reduced pressure, filter, concentrate, purify, and obtain organic compound 1. Q2: Organic compound 1, potassium carbonate and dimethyl sulfoxide were added to a container in sequence. The mixture was stirred at room temperature under argon atmosphere. Then 1,2-dibromotetrafluoroethane was added. The mixture was sealed, heated and stirred. The mixture was extracted, washed, and the solvent was removed under reduced pressure. The residue was added dropwise to a mixture of zinc and acetonitrile under reflux conditions. The mixture was heated and stirred. After the reaction was completed, the mixture was filtered, concentrated under reduced pressure, and purified to obtain organic compound 2. Q3: Under argon atmosphere, organic compound 2 is added to a container containing dichloromethane, then Grubbs II reagent is added to dichloromethane, stirred and dissolved, then added dropwise to the container, reacted at room temperature, then ethyl vinyl ether is added dropwise, stirred and reacted, precipitated, filtered, and dried to obtain a composite corrosion resistant agent; The preparation method of the modified impact-resistant agent includes the following steps: S1: Add perfluoropolyether carboxylic acid to a container, then add methyl nonafluorobutyl ether and oxalyl chloride, mix well, heat and stir under an argon atmosphere, stir and reflux to react, after the reaction is completed, heat and rotary evaporate to obtain intermediate a; S2: Intermediate a and 4,4'-diaminodiphenyl disulfide were added to a container in sequence, followed by triethylamine. The mixture was stirred and reacted. After the reaction was completed, the mixture was rotary evaporated, washed, and vacuum dried to obtain the modified impact-resistant agent. The synthesis reaction formula for the composite corrosion resistant agent is as follows: ； The synthesis reaction formula for the modified impact-resistant agent is as follows: 。 2. The method for preparing the impact-resistant filter cartridge material based on recycled ABS according to claim 1, characterized in that, In Q1, the ratio of norborneol adipic anhydride, chitosan and acetic acid is (1.64-2.05) g: (1.61-1.98) g: (120-150) mL.

3. The method for preparing the impact-resistant filter cartridge material based on recycled ABS according to claim 1, characterized in that, In Q2, the ratio of organic compound 1, potassium carbonate, dimethyl sulfoxide, 1,2-dibromotetrafluoroethane, zinc and acetonitrile is (1-1.6) g : (0.541-0.823) g : (13-20) mL : (1.21-1.87) g : (0.255-0.323) g : (10-18) mL.

4. The method for preparing the impact-resistant filter cartridge material based on recycled ABS according to claim 1, characterized in that, In Q3, the ratio of organic compound 2, Grubbs II reagent and ethyl vinyl ether is (1.5-2.1) g : (0.038-0.045) g : (0.15-0.22) mL.

5. The method for preparing the impact-resistant filter cartridge material based on recycled ABS according to claim 1, characterized in that, In S1, the ratio of perfluoropolyether carboxylic acid, methyl nonafluorobutyl ether and oxaloyl chloride is (6.8-10.2) g : (20.2-25.6) g : (5-7.5) mL.

6. The method for preparing the impact-resistant filter cartridge material based on recycled ABS according to claim 1, characterized in that, In S2, the molar ratio of intermediate a to 4,4'-diaminodiphenyl disulfide is (1.8-2.2):(0.9-1.04).

7. The method for preparing the impact-resistant filter cartridge material based on recycled ABS according to claim 1, characterized in that, In step one, a sodium chloride aqueous solution of 5.17-10.71 g / mL is used in the density sorting process to break the material to 10-40 mm. In step two, the ratio of the amount of recycled ABS substrate, composite corrosion resistant agent, modified impact resistant agent, antioxidant and lubricant is (85-90) g: (5-8) g: (1-4) g: (0.2-0.5) g: (0.3-0.5) g.

8. An impact-resistant filter cartridge material based on recycled ABS, characterized in that, It is prepared by the preparation method according to any one of claims 1-7.

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