A high-strength, conductive, and corrosion-resistant PVC pipe containing modified lithium slag and its preparation method

Abstract

This invention discloses a high-strength conductive and corrosion-resistant PVC pipe containing modified lithium slag and its preparation method, relating to the technical field of PVC pipes for construction. The high-strength conductive PVC pipe containing modified lithium slag comprises the following components in parts by weight: 100 parts PVC resin, 8-12 parts impact modifier, and Ti3C2T. X The composition includes 4-10 parts of polyethylene oxide nanoparticle conductive agent, 6-10 parts of modified lithium slag, 1-3 parts of lubricant, 3-6 parts of heat stabilizer, 3-6 parts of plasticizer, 1-2 parts of anti-aging agent, 2-5 parts of flame retardant, and 0.1-0.3 parts of colorant. High-strength conductive and corrosion-resistant PVC pipes prepared using this invention are applied to coal mine pipeline construction. While meeting conductivity requirements, they improve mechanical strength and enhance resistance to acid and alkali corrosion.

Description

Technical Field

[0001] This invention relates to the field of PVC pipe technology for building materials, and in particular to a high-strength conductive and corrosion-resistant PVC pipe containing modified lithium slag and its preparation method. Background Technology

[0002] For a long time, underground coal mine structures in my country have primarily used fiberglass reinforced plastic (FRP) and steel to manufacture drainage, ventilation, dust extraction, and gas extraction pipes. FRP pipes have high strength but are brittle during use and are more prone to damage due to long-term aging and impacts. Steel pipes have high strength but high density, weak corrosion resistance, complex installation, high maintenance and anti-corrosion costs, and a short service life. Currently, the most widely used underground coal mine pipelines are primarily made of PE and PVC, which offer advantages over FRP and steel pipes such as light weight, corrosion resistance, and toughness. However, PE pipes are expensive, have low strength, poor flame retardancy, and are inconvenient to install and maintain. In particular, PE pipes are connected via hot-melt welding, requiring a heating power source, which poses certain safety hazards. PVC pipes, on the other hand, have advantages over PE pipes, including lower manufacturing costs, better flame retardancy, and more reliable connections. To better utilize PVC pipes in coal mine pipeline construction, new requirements have been placed on PVC pipes, including higher mechanical properties, better electrical conductivity, and stronger resistance to acid and alkali corrosion. Summary of the Invention

[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art. To meet the requirements for PVC pipes used in coal mine construction, this invention provides a high-strength conductive PVC pipe containing modified lithium slag and its preparation method. (Ti3C2T) X It is a novel type of two-dimensional nanomaterial with high conductivity, which will be developed through the application of Ti3C2T X The surface of nanoparticles is chemically grafted with the ionic conductive polymer polyethylene oxide (PEO), which serves as a conductive agent for the nanoparticles. On one hand, the inorganic and organic conductive materials are chemically linked, resulting in a tight bond that enhances conductivity. On the other hand, PVC and PEO are both polar polymers, exhibiting good compatibility and preventing the formation of Ti3C2T. X The aggregation of nanoparticles results in excellent dispersibility in PVC resin, allowing for full utilization of its electrical conductivity. Simultaneously, the two-dimensional layered structure of Ti3C2T... XUniformly distributed within the PVC resin, it forms dense, sheet-like barrier layers, effectively preventing the intrusion of corrosive media and thus endowing the PVC pipe with excellent corrosion resistance. The modified lithium slag powder / basalt fiber / silicon carbide whisker composite serves as a mechanical property enhancing filler, and the addition of a coupling agent further strengthens the bond between the lithium slag powder, basalt fiber, silicon carbide whiskers, PVC resin, and other additives. On one hand, lithium slag powder replaces calcium carbonate powder, significantly reducing the production cost of PVC pipe products while maintaining good hardness, rigidity, and impact resistance; on the other hand, the addition of basalt fiber and silicon carbide whiskers further enhances the mechanical strength and toughness of the PVC pipe. By optimizing the formulation of each component, a lightweight, tough, high-strength, conductive, and corrosion-resistant PVC pipe is prepared.

[0004] The technical solution of the present invention is as follows:

[0005] The first aspect of the present invention provides a high-strength conductive and corrosion-resistant PVC pipe containing modified lithium slag, comprising the following raw materials in parts by weight:

[0006] 100 parts PVC resin, 8-12 parts impact modifier, Ti3C2T X - 4-10 parts of polyethylene oxide nanoparticle conductive agent, 6-10 parts of modified lithium slag, 1-3 parts of lubricant, 3-6 parts of heat stabilizer, 3-6 parts of plasticizer, 1-2 parts of anti-aging agent, 2-5 parts of flame retardant, and 0.1-0.3 parts of colorant.

[0007] Optionally, the Ti3C2T X - Methods for preparing polyoxyethylene nanoparticle conductive agents include:

[0008] First, add DMSO (dimethyl sulfoxide) solvent to the reaction vessel, then add Ti3C2T. X The powder was transferred to a temperature of 60-80℃ and stirred. Then, the hydroxyl activator DBTO (di-n-butyltin oxide) was added, and stirring continued. Ethylene oxide monomer was added to the system and stirred to react. After the reaction was completed, the mixture was centrifuged and washed with anhydrous ethanol. Finally, the product was vacuum dried to obtain Ti3C2T. X - Polyethylene oxide nanoparticle conductive agent.

[0009] Optionally, the DMSO solvent is: Ti3C2T X The ratio of powder to DBTO to ethylene oxide monomer is 500~700mL: 8~12g: 0.05~0.15g: 2~2.4g.

[0010] Optionally, the method for preparing the modified lithium slag includes:

[0011] 1) The lithium slag was ball-milled to obtain a specific surface area of ​​1000-1500 m². 2 / kg of lithium slag fine powder;

[0012] 2) Mix the chloroalkylsilane coupling agent with ethanol to prepare a chloroalkylsilane coupling agent / ethanol mixture;

[0013] 3) Add basalt fiber to ethanol, disperse ultrasonically, continue to add silicon carbide whiskers, disperse ultrasonically, and dry to obtain basalt fiber / silicon carbide whisker mixture;

[0014] 4) The lithium slag fine powder and basalt fiber / silicon carbide whiskers are stirred and treated, and the chloroalkylsilane coupling agent / ethanol mixture is sprayed at the same time. After the chloroalkylsilane coupling agent / ethanol mixture is sprayed, it is stirred evenly and then heated to 70-90℃ for 60-120 minutes to obtain modified lithium slag.

[0015] Optionally, in the method for preparing the modified lithium slag, the mass ratio of the chloroalkylsilane coupling agent to ethanol is 1-2:10-20, the mass ratio of the lithium slag to the chloroalkylsilane coupling agent is 20-40:1-2, and the mass ratio of the lithium slag, basalt fiber, and silicon carbide whiskers is 5-10:1-5:1-5.

[0016] Optionally, in the method for preparing the modified lithium slag, the chloroalkylsilane coupling agent is at least one of 3-chloropropyltrimethoxysilane, 3-chloropropyltrichlorosilane, and 3-chloropropyldimethoxysilane.

[0017] Optionally, the PVC resin is at least one of SG-4, SG-5, and SG-6 type polyvinyl chloride resins;

[0018] The impact modifier is a mixture of CPE and MBS, wherein the weight ratio of CPE to MBS is 3 to 5:1;

[0019] The lubricant is a mixture of stearic acid and PE wax, wherein the weight ratio of stearic acid to PE wax is 1 to 2:1.

[0020] The heat stabilizer is at least one of calcium-zinc stabilizer and organotin stabilizer;

[0021] The plasticizer is at least one of diisooctyl phthalate and epoxidized soybean oil;

[0022] The flame retardant is at least one of aluminum hydroxide, magnesium hydroxide, and antimony trioxide.

[0023] A second aspect of the present invention provides a method for preparing the above-mentioned high-strength conductive and corrosion-resistant PVC pipe containing modified lithium slag, comprising the following steps:

[0024] S1. Place each raw material into a high-speed mixer in proportion and heat it gradually. Stir it thoroughly at 1000-1200 r / min until the temperature of the mixture reaches 110-120℃. Then, put the mixed material into a cold mixing equipment and continue mixing at 400-500 r / min until the temperature of the material drops to 40-50℃.

[0025] S2. The mixed materials are poured into the hopper of a twin-screw extruder for melt extrusion, shaping, cooling and cutting to obtain the PVC pipe.

[0026] Optionally, in step S2, the heating zone temperature of the twin-screw extruder barrel is: Zone 1 160℃-165℃, Zone 2 165℃-170℃, Zone 3 170℃-175℃, Zone 4 175℃-180℃, and Zone 5 185℃-190℃.

[0027] Optionally, in step S2, the heating zone temperature of the molding die is: Zone 1 185℃-190℃, Zone 2 190℃-195℃, and Zone 3 195℃-200℃.

[0028] This invention has at least one of the following beneficial effects:

[0029] This invention first introduces a novel two-dimensional nanomaterial, Ti3C2T, with high conductivity. X And through Ti3C2T X The surface of nanoparticles is chemically grafted with the ionic conductive polymer polyethylene oxide (PEO), which serves as a conductive agent for the nanoparticles. On one hand, the inorganic and organic conductive materials are chemically linked, resulting in a tight bond that enhances conductivity. On the other hand, PVC and PEO are both polar polymers, exhibiting good compatibility and preventing the formation of Ti3C2T. X The aggregation of nanoparticles results in excellent dispersibility in PVC resin, allowing for full utilization of its electrical conductivity. Simultaneously, the two-dimensional layered structure of Ti3C2T... X Uniformly distributed within the PVC resin, forming dense, sheet-like barrier layers, it effectively prevents the intrusion of corrosive media, thus endowing the pipe with excellent corrosion resistance. Secondly, lithium slag powder is introduced, and a modified lithium slag powder / basalt fiber / silicon carbide whisker composite is used as a mechanical property enhancing filler. The addition of a coupling agent further enhances the tightness between the lithium slag powder, basalt fiber, silicon carbide whiskers, PVC resin, and other additives. On one hand, lithium slag powder replaces calcium carbonate powder, significantly reducing the production cost of PVC pipe products while maintaining good hardness, rigidity, and impact resistance; on the other hand, the addition of basalt fiber and silicon carbide whiskers further enhances the mechanical strength and toughness of the PVC pipe. Finally, by optimizing the formulation of each component, a lightweight, tough, high-strength, conductive, and corrosion-resistant PVC pipe is prepared. Detailed Implementation

[0030] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] One embodiment of the present invention provides a high-strength conductive and corrosion-resistant PVC pipe containing modified lithium slag, comprising the following raw materials in parts by weight:

[0032] 100 parts PVC resin, 8-12 parts impact modifier, Ti3C2T X - 4-10 parts of polyethylene oxide nanoparticle conductive agent, 6-10 parts of modified lithium slag, 1-3 parts of lubricant, 3-6 parts of heat stabilizer, 3-6 parts of plasticizer, 1-2 parts of anti-aging agent, 2-5 parts of flame retardant, and 0.1-0.3 parts of colorant.

[0033] In some embodiments, the preparation raw materials include the following parts by weight:

[0034] 100 parts PVC resin, 9-11 parts impact modifier, Ti3C2T X - 6-8 parts of polyethylene oxide nanoparticle conductive agent, 7-9 parts of modified lithium slag, 1.5-2.5 parts of lubricant, 4-5 parts of heat stabilizer, 4-5 parts of plasticizer, 1.2-1.8 parts of anti-aging agent, 3-4 parts of flame retardant, and 0.15-0.25 parts of colorant.

[0035] In some embodiments, the preparation raw materials include the following parts by weight:

[0036] 100 parts PVC resin, 10 parts impact modifier, Ti3C2T X - 7 parts of polyethylene oxide nanoparticle conductive agent, 8 parts of modified lithium slag, 2 parts of lubricant, 4.5 parts of heat stabilizer, 4.5 parts of plasticizer, 1.5 parts of anti-aging agent, 3.5 parts of flame retardant, and 0.2 parts of colorant.

[0037] In some embodiments, the PVC resin is at least one of SG-4, SG-5, and SG-6 type polyvinyl chloride resins; preferably, the PVC resin is SG-5 type polyvinyl chloride resin.

[0038] In some embodiments, the impact modifier is a mixture of CPE and MBS, wherein the weight ratio of CPE to MBS is 3 to 5:1; preferably, the weight ratio of CPE to MBS is 4:1.

[0039] In some embodiments, the lubricant is a mixture of stearic acid and PE wax, wherein the weight ratio of stearic acid to PE wax is 1 to 2:1; preferably, the weight ratio of stearic acid to PE wax is 2:1.

[0040] In some embodiments, the heat stabilizer is at least one of calcium-zinc stabilizer and organotin stabilizer; preferably, the heat stabilizer is an organotin stabilizer.

[0041] In some embodiments, the plasticizer is at least one of diisooctyl phthalate (DOP) and epoxidized soybean oil (ESO); preferably, the plasticizer is diisooctyl phthalate (DOP).

[0042] In some embodiments, the flame retardant is at least one of aluminum hydroxide, magnesium hydroxide, and antimony trioxide; preferably, the flame retardant is magnesium hydroxide.

[0043] In some embodiments, the Ti3C2T X - Methods for preparing polyoxyethylene nanoparticle conductive agents include:

[0044] First, add DMSO solvent to the reaction vessel, then add Ti3C2T. X The powder was transferred to an oil bath at 60-80℃ and mechanically stirred. Then, the hydroxyl activator DBTO was added, and stirring continued. Ethylene oxide monomer was then added to the system and the mixture was stirred to react. After the reaction was complete, the mixture was centrifuged and washed with anhydrous ethanol. Finally, the product was vacuum dried to obtain Ti3C2T. X - Polyethylene oxide nanoparticle conductive agent. The reaction process is shown below:

[0045]

[0046] Preferably, the Ti3C2T X - Methods for preparing polyoxyethylene nanoparticle conductive agents include:

[0047] First, add DMSO (dimethyl sulfoxide) solvent to a three-necked round-bottom flask, then add Ti3C2T. X The powder was transferred to a 70℃ oil bath and mechanically stirred for 0.5 h. Then, the hydroxyl activator DBTO (di-n-butyltin oxide) was added, and stirring was continued for another 0.5 h. Finally, ethylene oxide monomer was added to the system and the mixture was stirred for 12 h. After the reaction was completed, the mixture was centrifuged and washed five times with anhydrous ethanol. The product was then placed in a vacuum oven and vacuum dried at 60℃ for 24 h to obtain Ti3C2T. X - Polyethylene oxide nanoparticle conductive agent; DMSO: Ti3C2T X The ratio of powder:DBTO:ethylene oxide monomer is 600mL:10g:0.1g:2.2g.

[0048] In some embodiments, the DMSO solvent is: Ti3C2T X The ratio of powder to DBTO to ethylene oxide monomer is 500-700 mL: 8-12 g: 0.05-0.15 g: 2-2.4 g. Preferably, the ratio is DMSO:Ti3C2T. X The ratio of powder:DBTO:ethylene oxide monomer is 600mL:10g:0.1g:2.2g.

[0049] In some embodiments, the method for preparing the modified lithium slag includes:

[0050] 1) The lithium slag was ball-milled to obtain a specific surface area of ​​1200 m². 2 / kg of lithium slag fine powder;

[0051] 2) Mix the chloroalkylsilane coupling agent with ethanol to prepare a chloroalkylsilane coupling agent / ethanol mixture;

[0052] 3) Add basalt fiber to ethanol, disperse ultrasonically, continue to add silicon carbide whiskers, disperse ultrasonically, and dry to obtain basalt fiber / silicon carbide whisker mixture;

[0053] 4) The lithium slag fine powder and basalt fiber / silicon carbide whiskers are stirred, and the chloroalkylsilane coupling agent / ethanol mixture is sprayed onto the surface of the lithium slag powder / basalt fiber / silicon carbide whisker composite. After the chloroalkylsilane coupling agent / ethanol mixture is sprayed, the mixture is stirred evenly, and then heated to 80°C for 90 minutes to obtain modified lithium slag, which is the modified lithium slag powder / basalt fiber / silicon carbide whisker composite.

[0054] Preferably, in the preparation method of the modified lithium slag powder / basalt fiber / silicon carbide whisker composite, the mass ratio of the chloroalkylsilane coupling agent to ethanol is 1:10, the mass ratio of the lithium slag to the chloroalkylsilane coupling agent is 20:1, and the mass ratio of the lithium slag, basalt fiber, and silicon carbide whiskers is 4:1:1.

[0055] Preferably, the high-strength conductive and corrosion-resistant PVC pipe containing modified lithium slag is characterized in that the chloroalkylsilane coupling agent is 3-chloropropyltrimethoxysilane.

[0056] Another embodiment of the present invention provides a method for preparing high-strength conductive and corrosion-resistant PVC pipe containing modified lithium slag, comprising the following steps:

[0057] S1. Place each component into a high-speed mixer in proportion and heat it gradually. Stir it thoroughly at 1000 r / min until the temperature of the mixture reaches 110℃. Then, put the mixed material into a cold mixing equipment and continue mixing at 500 r / min until the temperature of the material drops to 50℃.

[0058] S2. The mixed materials are poured into the hopper of a twin-screw extruder for melt extrusion, shaping, cooling and cutting to obtain the PVC pipe.

[0059] Preferably, the method for preparing the high-strength conductive and corrosion-resistant PVC pipe containing modified lithium slag is characterized in that, in step S2, the heating zone temperature of the twin-screw extruder barrel is: zone 1 165℃, zone 2 170℃, zone 3 175℃, zone 4 180℃, and zone 5 185℃; the heating zone temperature of the molding die is: zone 1 190℃, zone 2 195℃, and zone 3 200℃.

[0060] The present invention will be further described in detail below with reference to specific embodiments, but the present invention is not limited to the following specific embodiments.

[0061] The PVC resin used in the following examples and comparative examples is SG-5 type polyvinyl chloride resin, the anti-aging agent is antioxidant 1010, the flame retardant is modified industrial grade magnesium hydroxide flame retardant (mesh size 1250-3000), the heat stabilizer is calcium zinc stabilizer CZX-768, the plasticizer is DOP (117-84-0), the heat stabilizer is organotin stabilizer TM181, the colorant is pigment red 53:1 (5160-02-1), and the chloroalkylsilane coupling agent is 3-chloropropyltrimethoxysilane.

[0062] Example 1

[0063] I. Ti3C2T X Preparation of polyethylene oxide nanoparticle conductive agents:

[0064] First, add 600 mL of DMSO (dimethyl sulfoxide) solvent to a three-necked round-bottom flask, then add 10 g of Ti3C2T. X The powder was transferred to a 70℃ oil bath and mechanically stirred for 0.5 h. Then, 0.1 g of hydroxyl activator DBTO (di-n-butyltin oxide) was added, and stirring was continued for another 0.5 h. Next, 2.2 g of ethylene oxide monomer was added to the system and the mixture was stirred for 12 h. After the reaction was complete, the mixture was centrifuged and washed five times with anhydrous ethanol. Finally, the product was placed in a vacuum oven and vacuum dried at 60℃ for 24 h to obtain Ti3C2T. X - Polyethylene oxide nanoparticle conductive agent.

[0065] II. Preparation of modified lithium slag:

[0066] 1) Take a certain amount of lithium slag and ball mill it to obtain a specific surface area of ​​1200 m². 2 / kg of lithium slag fine powder;

[0067] 2) Mix 1g of chloroalkylsilane coupling agent with 10g of ethanol to prepare a chloroalkylsilane coupling agent / ethanol mixture;

[0068] 3) Add 5g of basalt fiber to 50mL of ethanol, disperse by ultrasonication, add 5g of silicon carbide whiskers, disperse by ultrasonication, and dry to obtain 10g of basalt fiber / silicon carbide whisker mixture.

[0069] 4) Stir the 20g lithium slag fine powder and 10g basalt fiber / silicon carbide whiskers, and simultaneously spray the chloroalkylsilane coupling agent / ethanol mixture onto the surface of the 30g lithium slag powder / basalt fiber / silicon carbide whisker composite. After the chloroalkylsilane coupling agent / ethanol mixture is sprayed, continue stirring until uniform, and then heat to 80℃ for 90 minutes to obtain 30g modified lithium slag, which is the modified lithium slag powder / basalt fiber / silicon carbide whisker composite.

[0070] III. Preparation of high-strength conductive PVC pipes containing modified lithium slag:

[0071] S1. Place each component into a high-speed mixer in proportion and heat it gradually. Stir it thoroughly at 1000 r / min until the temperature of the mixture reaches 110℃. Then, put the mixed material into a cold mixing equipment and continue mixing at 500 r / min until the temperature of the material drops to 50℃.

[0072] S2. The mixed materials are poured into the hopper of a twin-screw extruder for melt extrusion, shaping, cooling and cutting to obtain the PVC pipe.

[0073] In step S2, the heating zone temperatures of the twin-screw extruder barrel are: Zone 1 165℃, Zone 2 170℃, Zone 3 175℃, Zone 4 180℃, and Zone 5 185℃; the heating zone temperatures of the molding die are: Zone 1 190℃, Zone 2 195℃, and Zone 3 200℃.

[0074] IV. Component mass ratio of high-strength conductive and corrosion-resistant PVC pipe containing modified lithium slag:

[0075] 100 parts PVC resin, 10 parts impact modifier (8 parts CPE, 2 parts MBS), Ti3C2T X- 6 parts of polyethylene oxide nanoparticle conductive agent, 6 parts of modified lithium slag, 1.5 parts of lubricant (1 part of stearic acid and 0.5 parts of PE wax), 4 parts of heat stabilizer, 5 parts of plasticizer, 1.5 parts of anti-aging agent, 3 parts of flame retardant, and 0.2 parts of colorant.

[0076] Example 2

[0077] I. Ti3C2T X Preparation of polyethylene oxide nanoparticle conductive agents:

[0078] First, add 600 mL of DMSO (dimethyl sulfoxide) solvent to a three-necked round-bottom flask, then add 10 g of Ti3C2T. X The powder was transferred to a 70℃ oil bath and mechanically stirred for 0.5 h. Then, 0.1 g of hydroxyl activator DBTO (di-n-butyltin oxide) was added, and stirring was continued for another 0.5 h. Next, 2.2 g of ethylene oxide monomer was added to the system and the mixture was stirred for 12 h. After the reaction was complete, the mixture was centrifuged and washed five times with anhydrous ethanol. Finally, the product was placed in a vacuum oven and vacuum dried at 60℃ for 24 h to obtain Ti3C2T. X - Polyethylene oxide nanoparticle conductive agent.

[0079] II. Preparation of modified lithium slag:

[0080] 1) Take a certain amount of lithium slag and ball mill it to obtain a specific surface area of ​​1200 m². 2 / kg of lithium slag fine powder;

[0081] 2) Mix 1g of chloroalkylsilane coupling agent with 10g of ethanol to prepare a chloroalkylsilane coupling agent / ethanol mixture;

[0082] 3) Add 5g of basalt fiber to 50mL of ethanol, disperse by ultrasonication, add 5g of silicon carbide whiskers, disperse by ultrasonication, and dry to obtain 10g of basalt fiber / silicon carbide whisker mixture.

[0083] 4) Stir the 20g lithium slag fine powder and 10g basalt fiber / silicon carbide whiskers, and simultaneously spray the chloroalkylsilane coupling agent / ethanol mixture onto the surface of the 30g lithium slag powder / basalt fiber / silicon carbide whisker composite. After the chloroalkylsilane coupling agent / ethanol mixture is sprayed, continue stirring until uniform, and then heat to 80℃ for 90 minutes to obtain 30g modified lithium slag, which is the modified lithium slag powder / basalt fiber / silicon carbide whisker composite.

[0084] III. Preparation of high-strength conductive PVC pipes containing modified lithium slag:

[0085] S1. Place each component into a high-speed mixer in proportion and heat it gradually. Stir it thoroughly at 1000 r / min until the temperature of the mixture reaches 110℃. Then, put the mixed material into a cold mixing equipment and continue mixing at 500 r / min until the temperature of the material drops to 50℃.

[0086] S2. The mixed materials are poured into the hopper of a twin-screw extruder for melt extrusion, shaping, cooling and cutting to obtain the PVC pipe.

[0087] In step S2, the heating zone temperatures of the twin-screw extruder barrel are: Zone 1 165℃, Zone 2 170℃, Zone 3 175℃, Zone 4 180℃, and Zone 5 185℃; the heating zone temperatures of the molding die are: Zone 1 190℃, Zone 2 195℃, and Zone 3 200℃.

[0088] IV. Component mass ratio of high-strength conductive and corrosion-resistant PVC pipe containing modified lithium slag:

[0089] 100 parts PVC resin, 10 parts impact modifier (8 parts CPE, 2 parts MBS), Ti3C2T X - 8 parts of polyethylene oxide nanoparticle conductive agent, 6 parts of modified lithium slag, 1.5 parts of lubricant (1 part of stearic acid and 0.5 parts of PE wax), 4 parts of heat stabilizer, 5 parts of plasticizer, 1.5 parts of anti-aging agent, 3 parts of flame retardant, and 0.2 parts of colorant.

[0090] Example 3

[0091] I. Ti3C2T X Preparation of polyethylene oxide nanoparticle conductive agents:

[0092] First, add 600 mL of DMSO (dimethyl sulfoxide) solvent to a three-necked round-bottom flask, then add 10 g of Ti3C2T. X The powder was transferred to a 70℃ oil bath and mechanically stirred for 0.5 h. Then, 0.1 g of hydroxyl activator DBTO (di-n-butyltin oxide) was added, and stirring was continued for another 0.5 h. Next, 2.2 g of ethylene oxide monomer was added to the system and the mixture was stirred for 12 h. After the reaction was complete, the mixture was centrifuged and washed five times with anhydrous ethanol. Finally, the product was placed in a vacuum oven and vacuum dried at 60℃ for 24 h to obtain Ti3C2T. X - Polyethylene oxide nanoparticle conductive agent.

[0093] II. Preparation of modified lithium slag:

[0094] 1) Take a certain amount of lithium slag and ball mill it to obtain a specific surface area of ​​1200 m². 2 / kg of lithium slag fine powder;

[0095] 2) Mix 1g of chloroalkylsilane coupling agent with 10g of ethanol to prepare a chloroalkylsilane coupling agent / ethanol mixture;

[0096] 3) Add 5g of basalt fiber to 50mL of ethanol, disperse by ultrasonication, add 5g of silicon carbide whiskers, disperse by ultrasonication, and dry to obtain 10g of basalt fiber / silicon carbide whisker mixture.

[0097] 4) Stir the 20g lithium slag fine powder and 10g basalt fiber / silicon carbide whiskers, and simultaneously spray the chloroalkylsilane coupling agent / ethanol mixture onto the surface of the 30g lithium slag powder / basalt fiber / silicon carbide whisker composite. After the chloroalkylsilane coupling agent / ethanol mixture is sprayed, continue stirring until uniform, and then heat to 80℃ for 90 minutes to obtain 30g modified lithium slag, which is the modified lithium slag powder / basalt fiber / silicon carbide whisker composite.

[0098] III. Preparation of high-strength conductive PVC pipes containing modified lithium slag:

[0099] S1. Place each component into a high-speed mixer in proportion and heat it gradually. Stir it thoroughly at 1000 r / min until the temperature of the mixture reaches 110℃. Then, put the mixed material into a cold mixing equipment and continue mixing at 500 r / min until the temperature of the material drops to 50℃.

[0100] S2. The mixed materials are poured into the hopper of a twin-screw extruder for melt extrusion, shaping, cooling and cutting to obtain the PVC pipe.

[0101] In step S2, the heating zone temperatures of the twin-screw extruder barrel are: Zone 1 165℃, Zone 2 170℃, Zone 3 175℃, Zone 4 180℃, and Zone 5 185℃; the heating zone temperatures of the molding die are: Zone 1 190℃, Zone 2 195℃, and Zone 3 200℃.

[0102] IV. Component mass ratio of high-strength conductive and corrosion-resistant PVC pipe containing modified lithium slag:

[0103] 100 parts PVC resin, 10 parts impact modifier (8 parts CPE, 2 parts MBS), Ti3C2T X - 10 parts of polyethylene oxide nanoparticle conductive agent, 6 parts of modified lithium slag, 1.5 parts of lubricant (1 part of stearic acid and 0.5 parts of PE wax), 4 parts of heat stabilizer, 5 parts of plasticizer, 1.5 parts of anti-aging agent, 3 parts of flame retardant, and 0.2 parts of colorant.

[0104] Comparative Example 1

[0105] The only difference from Example 1 is that Ti3C2T was not added. X- Polyethylene oxide nanoparticle conductive agent and modified lithium slag, instead of adding 14 parts calcium carbonate. Everything else is the same as in Example 1.

[0106] Comparative Example 2

[0107] The only difference from Example 1 is that modified lithium slag was not added, but 6 parts of calcium carbonate were added instead. Everything else is the same as Example 1.

[0108] Comparative Example 3

[0109] The only difference from Example 1 is that Ti3C2T was not added. X - The conductive agent was replaced with 8 parts of calcium carbonate instead of ethylene oxide nanoparticles. Everything else was the same as in Example 1.

[0110] Comparative Example 4

[0111] The only difference from Example 1 is that Ti3C2T was not added. X - Polyethylene oxide nanoparticle conductive agent, instead of adding 6 parts of unmodified Ti3C2T X Powder. Everything else is the same as in Example 1.

[0112] Comparative Example 5

[0113] The only difference from Example 1 is that no modified lithium slag was added; instead, 6 parts of unmodified lithium slag were added. The lithium slag was only ground in step 1) of the "Preparation of Modified Lithium Slag" in Example 1, and the other steps were not performed. Everything else is the same as in Example 1.

[0114] Comparative Example 6

[0115] The raw materials and proportions are the same as in Example 1. The only difference is that in step S2 of the preparation method, the heating zone temperatures of the twin-screw extruder barrel are: Zone 1 165℃, Zone 2 165℃, Zone 3 165℃, Zone 4 165℃, and Zone 5 165℃; the heating zone temperatures of the molding die are: Zone 1 190℃, Zone 2 190℃, and Zone 3 190℃. Everything else is the same as in Example 1.

[0116] Table 1. Specific addition amounts of each raw material in Examples 1-3 and Comparative Examples 1-6

[0117]

[0118] The PVC pipes prepared in Examples 1-3 and Comparative Examples 1-6 were subjected to performance tests, and the test results are shown in Figure 2. Specifically, the electrical conductivity test used standard GB / T15662-1995; the acid and alkali corrosion resistance test used standard GB / T11547-2008: sulfuric acid (75%), sodium hydroxide (40%), and sodium chloride (10%) as the test medium, with an immersion time of 7 weeks and an immersion temperature of 60℃; the tensile properties test used standard GB / T1040-1992: tensile rate 50 mm / min, original gauge length 100 mm; the bending properties test used standard GB / T9341-2000: span 60 mm, speed 2 mm / min; and the impact properties test used standard GB / T1043-1993: support wire distance 60 mm.

[0119] Table 2 Performance Tests of High-Strength Conductive and Corrosion-Resistant PVC Pipes Containing Modified Lithium Slag from Examples 1-3 and Comparative Examples 1-6

[0120]

[0121] As can be seen from Table 2, the high-strength conductive and corrosion-resistant PVC pipes containing modified lithium slag prepared in Examples 1-3 have low resistance values, indicating that the PVC pipes have certain conductivity; good tensile strength, impact strength, and flexural strength properties, indicating that the PVC pipes have good mechanical properties; and good resistance to acid, alkali, and salt, indicating that the PVC pipes have good corrosion resistance.

[0122] Comparing Examples 1-3 with Comparative Examples 1-6, it can be seen that, firstly, Comparative Example 1 (without Ti3C2T) X The resistivity of the product (containing polyethylene oxide nanoparticle conductive agent and modified lithium slag) is greater than that of Example 1, while its tensile strength, impact strength, flexural strength, acid resistance, alkali resistance, and salt resistance are significantly lower than those of Example 1, indicating that the addition of Ti3C2T may affect the product's performance. X - Polyethylene oxide nanoparticle conductive agents and modified lithium slag affect the electrical conductivity, mechanical properties, and corrosion resistance of PVC pipes; similarly, Comparative Example 3 (without Ti3C2T) X The resistivity of the (polyethylene oxide nanoparticle conductive agent) is greater than that of Example 1, while its tensile strength, impact strength, flexural strength, acid resistance, alkali resistance, and salt resistance are significantly lower than those of Example 1, indicating that the addition of Ti3C2T may affect the performance. X- Polyethylene oxide nanoparticle conductive agents affect the electrical conductivity, mechanical properties, and corrosion resistance of PVC pipes. Furthermore, the tensile strength, impact strength, and flexural strength of Comparative Example 3 are higher than those of Comparative Example 1, indicating that the addition of modified lithium slag has a significant impact on the mechanical properties of PVC pipes. Comparative Example 2 also supports this conclusion; the tensile strength, impact strength, and flexural strength of Comparative Example 2 (without modified lithium slag) are significantly lower than those of Example 1, but its resistivity, acid resistance, alkali resistance, and salt resistance are comparable to those of Example 1. Secondly, Comparative Example 4 (using unmodified Ti3C2T...) X The resistivity of the powder is slightly higher than that of Example 1, while the tensile strength, impact strength, and flexural strength are slightly lower than those of Example 1, indicating whether the effect of Ti3C2T is significant. X Modification of the powder affects the conductivity and mechanical strength of PVC pipes. Comparative Example 5 (using unmodified lithium slag) showed comparable resistivity, acid, alkali, and salt resistance to Example 1, but significantly lower tensile strength, impact strength, and flexural strength compared to Example 1, indicating that modification of the lithium slag affects the mechanical strength of the PVC pipes. Finally, Comparative Example 6 (with identical heating temperatures in both the twin-screw extruder barrel and the molding die) showed comparable resistivity, acid, alkali, and salt resistance to Example 1, but lower tensile strength, impact strength, and flexural strength compared to Example 1, indicating that heating zone temperature also affects the mechanical strength of the PVC pipes.

[0123] 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.

Claims

1. A high strength electrically conductive corrosion resistant PVC pipe containing modified lithium slag, characterized in that, The preparation raw materials include the following mass fractions: PVC resin 100 parts, impact modifier 8-12 parts, Ti3C2T X - polyethylene oxide nanoparticles conductive agent 4-10 parts, modified lithium slag 6-10 parts, lubricant 1-3 parts, heat stabilizer 3-6 parts, plasticizer 3-6 parts, anti-aging agent 1-2 parts, flame retardant 2-5 parts, colorant 0.1-0.3 parts; The Ti3C2T X A method for preparing a polyethylene oxide nanoparticle conductive agent includes: DMSO solvent was first added to the reaction vessel, then Ti3C2T was added X The powder was transferred to a 60-80°C temperature stirring, then the hydroxyl activator DBTO was added, and the stirring was continued. The ethylene oxide monomer was added to the system and stirred for reaction. After the reaction was completed, centrifugal separation was performed, and the product was washed with anhydrous ethanol. Finally, the product was vacuum dried to obtain Ti3C2T X - Polyethylene oxide nanoparticle conductive agent; The preparation method of the modified lithium residue comprises the following steps: 1) Ball-milling the lithium residue to obtain a lithium residue fine powder with a specific surface area of 1000-1500 m 2 / kg; 2) Mixing the lithium residue fine powder with a binder to obtain a lithium residue mixture; 2) uniformly mixing chloroalkyl silane coupling agent and ethanol to prepare a chloroalkyl silane coupling agent / ethanol mixed solution; 3) adding basalt fibers into ethanol and ultrasonic dispersion, continuously adding silicon carbide whiskers and ultrasonic dispersion, drying to obtain basalt fiber / silicon carbide whisker mixture; 4) stirring the lithium residue powder and basalt fiber / silicon carbide whisker, spraying the chloroalkyl silane coupling agent / ethanol mixed solution, uniformly stirring after the spraying of the chloroalkyl silane coupling agent / ethanol mixed solution is completed, and then heating to 70-90℃ for 60-120min to prepare the modified lithium residue.

2. The high-strength conductive corrosion-resistant PVC pipe containing modified lithium residue according to claim 1, characterized in that, DMSO solvent: Ti3C2T X Powder: DBTO: oxirane monomer ratio = 500 ~ 700 mL: 8 ~ 12 g: 0.05 ~ 0.15 g: 2 ~ 2.4 g.

3. The high strength electrically conductive corrosion resistant PVC pipe containing modified lithium slag as claimed in claim 1, wherein, In the preparation method of the modified lithium residue, the mass ratio of the chloroalkyl silane coupling agent to ethanol is 1-2:10-20, the mass ratio of the lithium residue to the chloroalkyl silane coupling agent is 20-40:1-2, and the mass ratio of the lithium residue, basalt fiber and silicon carbide whisker is 5-10:1-5:1-5.

4. The high strength electrically conductive corrosion resistant PVC pipe containing modified lithium slag as claimed in claim 1, wherein, In the preparation method of the modified lithium residue, the chloroalkyl silane coupling agent is at least one of 3-chloropropyltrimethoxysilane, 3-chloropropyltrichlorosilane and 3-chloropropyldimethoxysilane.

5. The high-strength conductive corrosion-resistant PVC pipe containing modified lithium residue according to claim 1, characterized in that, The PVC resin is at least one of SG-4, SG-5 and SG-6 type polyvinyl chloride resins; The impact modifier is a mixture of CPE and MBS, and the weight ratio of the CPE to MBS is 3-5:1; The lubricant is a mixture of stearic acid and PE wax, and the weight ratio of the stearic acid to PE wax is 1-2:1; The heat stabilizer is at least one of calcium-zinc stabilizer and organic tin stabilizer; The plasticizer is at least one of diisooctyl phthalate and epoxy soybean oil; The flame retardant is at least one of aluminum hydroxide, magnesium hydroxide and antimony trioxide.

6. The method for preparing the high-strength conductive corrosion-resistant PVC pipe containing modified lithium slag according to any one of claims 1-5, characterized in that, The method comprises the following steps: S1, gradually heating each raw material in a high-speed mixer according to the proportion, fully stirring at 1000-1200r / min until the temperature of the mixture reaches 110-120℃, and then putting the mixed material into a cold mixing device to continue mixing at 400-500r / min until the temperature of the material drops to 40-50℃; S2, pouring the mixed material into the hopper of a double-screw extruder for melt extrusion, shaping cooling and cutting to prepare the PVC pipe.

7. The method of producing high strength electrically conductive corrosion resistant PVC pipe containing modified lithium slag according to claim 6, characterized in that, In the step S2, the temperature of the heating zone of the double-screw extruder barrel is: 160-165℃ for the first zone, 165-170℃ for the second zone, 170-175℃ for the third zone, 175-180℃ for the fourth zone and 185-190℃ for the fifth zone.

8. The process for the preparation of high strength electrically conductive corrosion resistant PVC pipe containing modified lithium slag as claimed in claim 6, wherein, In the step S2, the temperature of the heating zone of the forming die is: 185-190℃ for the first zone, 190-195℃ for the second zone and 195-200℃ for the third zone.

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