Nonmetal wire duct with shielding function and preparation method thereof

Abstract

The invention relates to the technical field of non-metal wire ducts, in particular to a non-metal wire duct with a shielding function and a preparation method of the non-metal wire duct. The nonmetal wire duct with the shielding function comprises the following raw materials in parts by mass: 80-120 parts of polyvinyl chloride, 10-20 parts of carboxylated styrene butadiene rubber, 5-15 parts of a methyl methacrylate-butadiene-styrene terpolymer, 5-10 parts of a pyrrole monomer, 1-5 parts of graphene oxide, 20-50 parts of activated carbon black, 0.1-0.2 part of ammonium persulfate, 1-3 parts of a compatilizer, 1-3 parts of a stabilizer and 1-5 parts of a plasticizer. The obtained composite material has excellent mechanical strength and electromagnetic shielding performance, the problem that the mechanical performance is reduced due to the fact that a large amount of carbon black is added is solved, the electromagnetic shielding performance is excellent on the basis that the good mechanical performance is obtained, and the application requirement of a non-metal wire groove for a high-shielding cable is met.

Description

Technical Field

[0001] This invention relates to the field of non-metallic wire trough technology, and in particular to a non-metallic wire trough with shielding function and its preparation method. Background Technology

[0002] In electrical wiring and other fields, non-metallic cable trays (such as PVC cable trays) are widely used for cable laying and protection due to their lightweight, corrosion resistance, and ease of installation. However, in practical applications, traditional non-metallic cable trays have significant drawbacks: the cables inside the trays are susceptible to interference from external electromagnetic radiation, which can affect the stability and accuracy of cable signal transmission and may even lead to equipment failure.

[0003] With the widespread use of electronic devices and the development of communication technology, electromagnetic interference has become an increasingly prominent problem. To address this issue, the industry generally adopts the method of using shielded cables. However, in practical applications, this method has several shortcomings: Firstly, it requires all cables to be shielded, which is difficult in many scenarios and has poor operability. For example, replacing some existing unshielded cables is not only labor-intensive but may also damage the existing wiring structure. Secondly, shielded cables are relatively expensive, and large-scale use will significantly increase the overall project cost.

[0004] By adding conductive materials (such as metal powder, conductive carbon black, carbon fiber, etc.) to the raw materials of the non-metallic wire trough body during the molding process of plastic wire trough, the conductive materials are evenly distributed inside the non-metallic wire trough body to form an internal conductive layer. After these conductive materials are evenly mixed with plastic raw materials, they are injection molded or extruded to obtain a non-metallic wire trough with an internal conductive layer, which can effectively solve the problem of electromagnetic radiation interference.

[0005] However, the conductive material exhibits severe agglomeration in the PVC matrix, resulting in an uneven conductive network. A high addition amount is required to achieve the ideal shielding effect, but excessive addition will significantly reduce the mechanical and processing properties of the material. At the same time, the poor interfacial bonding between the conductive material and the PVC matrix affects the mechanical strength and durability of the composite material, resulting in a generally unsatisfactory electromagnetic shielding effect.

[0006] Therefore, there is an urgent need for a method that can effectively solve the problem of external electromagnetic radiation interference to cables in non-metallic cable trays while ensuring their good mechanical strength, which has excellent research prospects. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by proposing a non-metallic wire trough with shielding function and its preparation method.

[0008] A non-metallic cable tray with shielding function, the raw materials of which include, by weight: 80-120 parts polyvinyl chloride, 10-20 parts carboxylated styrene-butadiene rubber, 5-15 parts methyl methacrylate-butadiene-styrene terpolymer, 5-10 parts pyrrole monomer, 1-5 parts graphene oxide, 20-50 parts activated carbon black, 0.1-0.2 parts ammonium persulfate, 1-3 parts compatibilizer, 1-3 parts stabilizer, and 1-5 parts plasticizer.

[0009] Preferably, the compatibilizer is maleic anhydride-grafted polypropylene.

[0010] Preferably, the stabilizer is at least one of zinc stearate, calcium stearate, and calcium-zinc composite stabilizer.

[0011] Preferably, the plasticizer is at least one selected from dimethyl phthalate, diethyl phthalate, di-n-butyl phthalate, and dioctyl phthalate.

[0012] Preferably, the activated carbon black is hyperbranched grafted carbon black; the hyperbranched grafted carbon black is prepared by the following steps: soaking carbon black in concentrated nitric acid, stirring at 60-70℃ for 10-30 min, filtering, washing, vacuum drying, adding to phosphate buffer, then adding 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide, stirring at 40-50℃ for 2-4 h, centrifuging, washing, vacuum drying, adding to solvent, adding terminal amino polyamide amine, stirring at 60-70℃ for 10-20 h under nitrogen protection, filtering, washing, and freeze drying.

[0013] More preferably, the carbon black has a particle size of 100-500 nm, and the mass ratio of carbon black, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, N-hydroxysuccinimide, and terminal amino polyamide amine is 20-40:0.4-0.6:0.7-1.4:1-5.

[0014] More preferably, the solvent is dimethyl sulfoxide.

[0015] More preferably, the generation of the terminal amino polyamide amine is 1.5-2.5.

[0016] The above-mentioned method for preparing non-metallic wire troughs with shielding function includes the following steps: S1. Add graphene oxide to a solvent and sonicate for 1-2 hours. Add pyrrole monomer and ammonium persulfate to the solvent. Stir at 60-70℃ for 5-10 hours under nitrogen protection. Adjust the pH of the system to 8-9 during stirring. Centrifuge, wash, and freeze dry to obtain pretreated graphene oxide. S2. Mix polyvinyl chloride, carboxylated styrene-butadiene rubber, methyl methacrylate-butadiene-styrene terpolymer, compatibilizer, activated carbon black, stabilizer, and plasticizer at room temperature for 1-5 minutes, heat to 100-110℃, stir for 5-12 minutes, and cool to 40-50℃ to obtain a premix. S3. Extrude the premixed material, cool and cut it into pellets, and shape it.

[0017] Preferably, in S1, the solvent is N,N-dimethylformamide.

[0018] Preferably, in S1, the ultrasonic frequency is 400-500W.

[0019] This invention adds conductive materials to the raw materials of the non-metallic wire trough body, allowing the conductive materials to be uniformly distributed inside the non-metallic wire trough body, forming an internal conductive network; it utilizes a composite of graphene oxide and polypyrrole to form a dual conductive framework, and the sp of graphene oxide... 2 Carbon networks provide planar conductive pathways, which, when combined with polypyrrole networks, synergistically construct three-dimensional conductive networks, significantly shortening electron migration paths, reducing volume resistivity, and achieving efficient shielding.

[0020] This invention uses hyperbranched polyamide amine grafted carbon black. The three-dimensional structure of the dendritic molecular chains prevents the agglomeration of carbon black particles, ensuring that the conductive carbon black is uniformly dispersed. When interacting with the PVC matrix, the hyperbranched structure can effectively disperse mechanical stress, avoid microcracks caused by stress concentration, and effectively enhance mechanical strength.

[0021] This invention utilizes a graphene oxide network as a continuous phase to form an electromagnetic wave reflective layer, while activated carbon black particles serve as a dispersed phase to constitute electromagnetic wave absorption centers. This causes electromagnetic waves to undergo multiple reflections and attenuations within the material, thereby significantly enhancing the shielding effect.

[0022] The proportions of each component in this invention are optimized to produce a composite material with excellent mechanical strength and electromagnetic shielding performance. This solves the problem of reduced mechanical properties caused by the addition of large amounts of carbon black. While achieving good mechanical properties, it also has excellent electromagnetic shielding performance, meeting the application requirements of non-metallic cable trays for high-shield cables.

[0023] Compared with the prior art, the present invention has the following beneficial effects: (1) It has good electromagnetic shielding effect. The present invention can effectively cancel external electromagnetic waves, thereby avoiding electromagnetic radiation interference to the cables in the cable tray and ensuring the stability and accuracy of the cable transmission signal.

[0024] (2) Reduce costs. It is not necessary to use shielded cables for all cables. Only the non-metallic cable trays need to be improved to form shielded cable trays, which significantly reduces the material cost of the overall project.

[0025] (3) Easy to operate. A conductive layer is formed during the production process of non-metallic wire troughs, which does not require major changes to the existing wiring method. The operation is simple and the applicability is strong.

[0026] (4) It does not affect the original advantages of non-metallic cable trays. This invention is an improvement on the existing non-metallic cable tray structure, retaining the original advantages of non-metallic cable trays such as light weight, corrosion resistance and convenient installation, while adding electromagnetic shielding function and expanding its application range. Attached Figure Description

[0027] Figure 1 The diagram shows a comparison of the tensile strength and electromagnetic wave shielding effectiveness of the non-metallic wire troughs obtained in Example 5 and Comparative Examples 1-2.

[0028] Figure 2 This is a comparison chart of the volume resistivity of the non-metallic wire grooves obtained in Example 5 and Comparative Examples 1-2. Detailed Implementation

[0029] The present invention will be further explained below with reference to specific embodiments.

[0030] The polyvinyl chloride used below is from Manner Plastics, LP, model number Manner Flexible PVCX4588. The carboxylated styrene-butadiene rubber used below is from Pujiang County Tianjie Rubber Industry Co., Ltd. The methyl methacrylate-butadiene-styrene terpolymer used below is from Denki Kagaku, Japan, model number MBS TP-SX-301. The amino-terminated polyamide amine used below is from Shanghai Maclean Biochemical Technology Co., Ltd.

[0031] Example 1: A non-metallic cable tray with shielding function, the raw materials of which include: 80g of polyvinyl chloride, 10g of carboxylated styrene-butadiene rubber, 5g of methyl methacrylate-butadiene-styrene terpolymer, 5g of pyrrole monomer, 1g of graphene oxide, 20g of hyperbranched grafted carbon black, 0.1g of ammonium persulfate, 1g of maleic anhydride grafted polypropylene, 1g of zinc stearate, and 1g of dimethyl phthalate.

[0032] Hyperbranched grafted carbon black is prepared by the following steps: 20g of carbon black with a particle size of 100-500nm is soaked in 100g of concentrated nitric acid with a mass fraction of 68%, stirred at 60℃ for 10min, filtered, washed, and vacuum dried, added to 100g of phosphate buffer with a pH of 5-6, and then 0.4g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and 0.7g of N-hydroxysuccinimide are added. The mixture is stirred at 40℃ for 2h, centrifuged, washed, and vacuum dried, added to 100g of dimethyl sulfoxide, and 1g of 1,5-generation terminal amino polyamide amine is added. The mixture is stirred at 60℃ for 10h under nitrogen protection, filtered, washed, and freeze-dried.

[0033] The above-mentioned method for preparing non-metallic wire troughs with shielding function includes the following steps: S1. Add graphene oxide to 40g N,N-dimethylformamide and sonicate for 1h at a frequency of 400W. Add pyrrole monomer and ammonium persulfate to the mixture and stir at 60℃ for 5h under nitrogen protection. During stirring, add triethylamine dropwise to adjust the pH of the system to 8-9. Centrifuge, wash, and freeze dry to obtain pretreated graphene oxide. S2. Place polyvinyl chloride, carboxylated styrene-butadiene rubber, methyl methacrylate-butadiene-styrene terpolymer, maleic anhydride-grafted polypropylene, hyperbranched grafted carbon black, zinc stearate, and dimethyl phthalate into a high-speed mixer, stir at 500 r / min at room temperature for 1 min, heat to 100℃, stir at 100 r / min for 5 min, and cool to 40℃ to obtain a premix. S3. Add the premixed material to a twin-screw extruder and extrude it. The extruder temperatures are 140℃, 150℃, 155℃, 162℃, 175℃, and 170℃ in sequence. After cooling, cut the material into pellets and place them into molds.

[0034] Example 2: A non-metallic cable tray with shielding function, the raw materials of which include: 120g of polyvinyl chloride, 20g of carboxylated styrene-butadiene rubber, 15g of methyl methacrylate-butadiene-styrene terpolymer, 10g of pyrrole monomer, 5g of graphene oxide, 50g of hyperbranched grafted carbon black, 0.2g of ammonium persulfate, 3g of maleic anhydride grafted polypropylene, 3g of calcium stearate, and 5g of diethyl phthalate.

[0035] Hyperbranched grafted carbon black was prepared using the following steps: 40g of carbon black with a particle size of 100-500nm was soaked in 200g of concentrated nitric acid with a mass fraction of 68%, stirred at 70℃ for 30min, filtered, washed, and vacuum dried. The carbon black was then added to 200g of phosphate buffer solution with a pH of 5-6, followed by the addition of 0.6g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and 1.4g of N-hydroxysuccinimide. The mixture was stirred at 50℃ for 4h, centrifuged, washed, and vacuum dried. The carbon black was then added to 200g of dimethyl sulfoxide, along with 5g of 2,5-generation terminal amino polyamide amine. The mixture was stirred at 70℃ for 20h under nitrogen protection, filtered, washed, and freeze-dried.

[0036] The above-mentioned method for preparing non-metallic wire troughs with shielding function includes the following steps: S1. Add graphene oxide to 80g of N,N-dimethylformamide and sonicate for 2h at a frequency of 500W. Add pyrrole monomer and ammonium persulfate to the mixture and stir at 70℃ for 10h under nitrogen protection. During stirring, add triethylamine dropwise to adjust the pH of the system to 8-9. Centrifuge, wash, and freeze dry to obtain pretreated graphene oxide. S2. Place polyvinyl chloride, carboxylated styrene-butadiene rubber, methyl methacrylate-butadiene-styrene terpolymer, maleic anhydride-grafted polypropylene, hyperbranched grafted carbon black, calcium stearate, and diethyl phthalate into a high-speed mixer, stir at 1200 r / min at room temperature for 5 min, heat to 110℃, stir at 200 r / min for 12 min, and cool to 50℃ to obtain a premix. S3. Add the premixed material to a twin-screw extruder and extrude it. The extruder temperatures are 145℃, 155℃, 160℃, 170℃, 180℃, and 175℃ in sequence. After cooling, cut the material into pellets and place them into molds.

[0037] Example 3: A non-metallic cable tray with shielding function, the raw materials of which include: 90g of polyvinyl chloride, 18g of carboxylated styrene-butadiene rubber, 8g of methyl methacrylate-butadiene-styrene terpolymer, 9g of pyrrole monomer, 2g of graphene oxide, 40g of hyperbranched grafted carbon black, 0.12g of ammonium persulfate, 2.5g of maleic anhydride grafted polypropylene, 1.5g of calcium zinc stabilizer, and 4g of dioctyl phthalate.

[0038] Hyperbranched grafted carbon black was prepared using the following steps: 25g of carbon black with a particle size of 100-500nm was soaked in 180g of 68% concentrated nitric acid, stirred at 62℃ for 25min, filtered, washed, and vacuum dried. The carbon black was then added to 120g of phosphate buffer solution with a pH of 5-6, followed by the addition of 0.55g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and 1.1g of N-hydroxysuccinimide. The mixture was stirred at 48℃ for 2.5h, centrifuged, washed, and vacuum dried. The carbon black was then added to 180g of dimethyl sulfoxide, along with 2g of 2,0-generation terminal amino polyamide amine. The mixture was stirred at 68℃ for 12h under nitrogen protection, filtered, washed, and freeze-dried.

[0039] The above-mentioned method for preparing non-metallic wire troughs with shielding function includes the following steps: S1. Add graphene oxide to 70g N,N-dimethylformamide and sonicate for 80min at a frequency of 480W. Add pyrrole monomer and ammonium persulfate to the mixture and stir at 62℃ for 9h under nitrogen protection. During stirring, add triethylamine dropwise to adjust the pH of the system to 8-9. Centrifuge, wash, and freeze dry to obtain pretreated graphene oxide. S2. Place polyvinyl chloride, carboxylated styrene-butadiene rubber, methyl methacrylate-butadiene-styrene terpolymer, maleic anhydride-grafted polypropylene, hyperbranched grafted carbon black, calcium-zinc stabilizer, and dioctyl phthalate into a high-speed mixer, stir at 600 r / min at room temperature for 4 min, heat to 102℃, stir at 170 r / min for 6 min, and cool to 48℃ to obtain a premix. S3. Add the premixed material to a twin-screw extruder and extrude it. The extruder temperatures are 141℃, 153℃, 157℃, 168℃, 177℃, and 173℃ respectively. After cooling, cut the material into pellets and place them into molds.

[0040] Example 4: A non-metallic cable tray with shielding function, the raw materials of which include: 110g of polyvinyl chloride, 12g of carboxylated styrene-butadiene rubber, 12g of methyl methacrylate-butadiene-styrene terpolymer, 7g of pyrrole monomer, 4g of graphene oxide, 30g of hyperbranched grafted carbon black, 0.18g of ammonium persulfate, 1.5g of maleic anhydride grafted polypropylene, 2.5g of calcium zinc stabilizer, and 2g of dioctyl phthalate.

[0041] Hyperbranched grafted carbon black was prepared using the following steps: 35g of carbon black with a particle size of 100-500nm was soaked in 120g of 68% concentrated nitric acid, stirred at 68℃ for 15min, filtered, washed, and vacuum dried. The carbon black was then added to 180g of phosphate buffer solution with a pH of 5-6, followed by the addition of 0.45g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and 0.9g of N-hydroxysuccinimide. The mixture was stirred at 42℃ for 3.5h, centrifuged, washed, and vacuum dried. The carbon black was then added to 120g of dimethyl sulfoxide, along with 4g of 2,0-generation terminal amino polyamide amine. The mixture was stirred at 62℃ for 18h under nitrogen protection, filtered, washed, and freeze-dried.

[0042] The above-mentioned method for preparing non-metallic wire troughs with shielding function includes the following steps: S1. Add graphene oxide to 50g N,N-dimethylformamide and sonicate for 100min at a frequency of 420W. Add pyrrole monomer and ammonium persulfate to the mixture and stir at 68℃ for 7h under nitrogen protection. During stirring, add triethylamine dropwise to adjust the pH of the system to 8-9. Centrifuge, wash, and freeze dry to obtain pretreated graphene oxide. S2. Place polyvinyl chloride, carboxylated styrene-butadiene rubber, methyl methacrylate-butadiene-styrene terpolymer, maleic anhydride-grafted polypropylene, hyperbranched grafted carbon black, calcium-zinc stabilizer, and dioctyl phthalate into a high-speed mixer, stir at 1000 r / min at room temperature for 2 min, heat to 108℃, stir at 130 r / min for 10 min, and cool to 42℃ to obtain a premix. S3. Add the premixed material to a twin-screw extruder and extrude it. The extruder temperatures are 143℃, 151℃, 159℃, 164℃, 179℃, and 171℃ respectively. After cooling, cut the material into pellets and place them into molds.

[0043] Example 5: A non-metallic cable tray with shielding function, the raw materials of which include: 100g of polyvinyl chloride, 15g of carboxylated styrene-butadiene rubber, 10g of methyl methacrylate-butadiene-styrene terpolymer, 8g of pyrrole monomer, 3g of graphene oxide, 35g of hyperbranched grafted carbon black, 0.15g of ammonium persulfate, 2g of maleic anhydride grafted polypropylene, 2g of calcium zinc stabilizer, and 3g of dioctyl phthalate.

[0044] Hyperbranched grafted carbon black is prepared by the following steps: 30g of carbon black with a particle size of 100-500nm is soaked in 150g of concentrated nitric acid with a mass fraction of 68%, stirred at 65℃ for 20min, filtered, washed, and vacuum dried, added to 150g of phosphate buffer with a pH of 5-6, and then 0.5g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and 1g of N-hydroxysuccinimide are added. The mixture is stirred at 45℃ for 3h, centrifuged, washed, and vacuum dried, added to 150g of dimethyl sulfoxide, and then 3g of 2,0-generation terminal amino polyamide amine is added. The mixture is stirred at 65℃ for 15h under nitrogen protection, filtered, washed, and freeze-dried.

[0045] The above-mentioned method for preparing non-metallic wire troughs with shielding function includes the following steps: S1. Add graphene oxide to 60g of N,N-dimethylformamide and sonicate for 90min at a frequency of 450W. Add pyrrole monomer and ammonium persulfate to the mixture and stir at 65℃ for 8h under nitrogen protection. During stirring, add triethylamine dropwise to adjust the pH of the system to 8-9. Centrifuge, wash, and freeze dry to obtain pretreated graphene oxide. S2. Place polyvinyl chloride, carboxylated styrene-butadiene rubber, methyl methacrylate-butadiene-styrene terpolymer, maleic anhydride-grafted polypropylene, hyperbranched grafted carbon black, calcium-zinc stabilizer, and dioctyl phthalate into a high-speed mixer, stir at 800 r / min at room temperature for 3 min, heat to 105℃, stir at 150 r / min for 8 min, and cool to 45℃ to obtain a premix. S3. Add the premixed material to a twin-screw extruder and extrude it. The extruder temperatures are 142℃, 152℃, 158℃, 166℃, 178℃, and 172℃ in sequence. After cooling, cut the material into pellets and place them into molds.

[0046] Comparative Example 1 A non-metallic cable tray with shielding function, the raw materials of which include: 100g of polyvinyl chloride, 15g of carboxylated styrene-butadiene rubber, 10g of methyl methacrylate-butadiene-styrene terpolymer, 8g of pyrrole monomer, 3g of graphene oxide, 35g of hyperbranched grafted carbon black, 0.15g of ammonium persulfate, 2g of maleic anhydride grafted polypropylene, 2g of calcium zinc stabilizer, and 3g of dioctyl phthalate.

[0047] Hyperbranched grafted carbon black is prepared by the following steps: 30g of carbon black with a particle size of 100-500nm is soaked in 150g of concentrated nitric acid with a mass fraction of 68%, stirred at 65℃ for 20min, filtered, washed, and vacuum dried, added to 150g of phosphate buffer with a pH of 5-6, and then 0.5g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and 1g of N-hydroxysuccinimide are added. The mixture is stirred at 45℃ for 3h, centrifuged, washed, and vacuum dried, added to 150g of dimethyl sulfoxide, and then 3g of 2,0-generation terminal amino polyamide amine is added. The mixture is stirred at 65℃ for 15h under nitrogen protection, filtered, washed, and freeze-dried.

[0048] The above-mentioned method for preparing non-metallic wire troughs with shielding function includes the following steps: S1. Add pyrrole monomer and ammonium persulfate to 60g N,N-dimethylformamide, stir at 65℃ for 8h under nitrogen protection, add triethylamine dropwise during stirring to adjust the pH of the system to 8-9, centrifuge, wash, freeze dry, add graphene oxide and mix evenly to obtain pretreated graphene oxide. S2. Place polyvinyl chloride, carboxylated styrene-butadiene rubber, methyl methacrylate-butadiene-styrene terpolymer, maleic anhydride-grafted polypropylene, hyperbranched grafted carbon black, calcium-zinc stabilizer, and dioctyl phthalate into a high-speed mixer, stir at 800 r / min at room temperature for 3 min, heat to 105℃, stir at 150 r / min for 8 min, and cool to 45℃ to obtain a premix. S3. Add the premixed material to a twin-screw extruder and extrude it. The extruder temperatures are 142℃, 152℃, 158℃, 166℃, 178℃, and 172℃ in sequence. After cooling, cut the material into pellets and place them into molds.

[0049] Comparative Example 2 A non-metallic cable tray with shielding function, the raw materials of which include: 100g of polyvinyl chloride, 15g of carboxylated styrene-butadiene rubber, 10g of methyl methacrylate-butadiene-styrene terpolymer, 8g of pyrrole monomer, 3g of graphene oxide, 35g of activated carbon black, 0.15g of ammonium persulfate, 2g of maleic anhydride-grafted polypropylene, 2g of calcium-zinc stabilizer, and 3g of dioctyl phthalate.

[0050] Activated carbon black is prepared by the following steps: 30g of carbon black with a particle size of 100-500nm is mixed evenly with 3g of 2.0 generation terminal amino polyamide amine.

[0051] The above-mentioned method for preparing non-metallic wire troughs with shielding function includes the following steps: S1. Add graphene oxide to 60g of N,N-dimethylformamide and sonicate for 90min at a frequency of 450W. Add pyrrole monomer and ammonium persulfate to the mixture and stir at 65℃ for 8h under nitrogen protection. During stirring, add triethylamine dropwise to adjust the pH of the system to 8-9. Centrifuge, wash, and freeze dry to obtain pretreated graphene oxide. S2. Place polyvinyl chloride, carboxylated styrene-butadiene rubber, methyl methacrylate-butadiene-styrene terpolymer, maleic anhydride-grafted polypropylene, activated carbon black, calcium-zinc stabilizer, and dioctyl phthalate into a high-speed mixer, stir at 800 r / min at room temperature for 3 min, heat to 105℃, stir at 150 r / min for 8 min, and cool to 45℃ to obtain a premix. S3. Add the premixed material to a twin-screw extruder and extrude it. The extruder temperatures are 142℃, 152℃, 158℃, 166℃, 178℃, and 172℃ in sequence. After cooling, cut the material into pellets and place them into molds.

[0052] The extruded pellets obtained from S3 of Examples 5 and Comparative Examples 1-2 were directly molded into standard specimens. The tensile strength of each group of standard specimens was determined using an electronic universal testing machine in accordance with GB / T1040.2-2022 "Determination of tensile properties of plastics - Part 2: Test conditions for molded and extruded plastics".

[0053] The electromagnetic wave shielding effectiveness of the non-metallic wire troughs obtained in Example 5 and Comparative Examples 1-2 was determined with reference to GJB 8820-2015 "Method for measuring the shielding effectiveness of electromagnetic shielding materials".

[0054] like Figure 1 As shown, the non-metallic wire trough obtained in Example 5 has the highest tensile strength and electromagnetic wave shielding effectiveness, which is better than Comparative Examples 1-2 (P<0.05).

[0055] Referring to GB / T 3048.3-2007 "Test Methods for Electrical Properties of Wires and Cables - Part 3: Volume Resistivity Test of Semiconducting Rubber and Plastic Materials", the volume resistivity of the non-metallic wire troughs obtained in Example 5 and Comparative Examples 1-2 was measured in oil baths at 20°C and 90°C using a resistivity meter.

[0056] like Figure 2 As shown, the non-metallic wire groove obtained in Example 5 has the lowest volume resistivity, which is better than that of Comparative Examples 1-2 (P<0.05).

[0057] 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 non-metallic wire trough with shielding function, characterized in that, Its raw materials, by weight, include: 80-120 parts polyvinyl chloride, 10-20 parts carboxylated styrene-butadiene rubber, 5-15 parts methyl methacrylate-butadiene-styrene terpolymer, 5-10 parts pyrrole monomer, 1-5 parts graphene oxide, 20-50 parts activated carbon black, 0.1-0.2 parts ammonium persulfate, 1-3 parts compatibilizer, 1-3 parts stabilizer, and 1-5 parts plasticizer.

2. The non-metallic wire trough with shielding function according to claim 1, characterized in that, The compatibilizer is maleic anhydride-grafted polypropylene.

3. The non-metallic wire trough with shielding function according to claim 1, characterized in that, The stabilizer is at least one of zinc stearate, calcium stearate, or calcium-zinc composite stabilizer.

4. The non-metallic wire trough with shielding function according to claim 1, characterized in that, The plasticizer is at least one of dimethyl phthalate, diethyl phthalate, di-n-butyl phthalate, and dioctyl phthalate.

5. The non-metallic wire trough with shielding function according to claim 1, characterized in that, The activated carbon black is hyperbranched grafted carbon black. The hyperbranched grafted carbon black is prepared by the following steps: the carbon black is soaked in concentrated nitric acid, stirred at 60-70℃ for 10-30 min, filtered, washed, vacuum dried, added to phosphate buffer, and then 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide are added. The mixture is stirred at 40-50℃ for 2-4 h, centrifuged, washed, vacuum dried, added to a solvent, and then terminal amino polyamide amine is added. The mixture is stirred at 60-70℃ for 10-20 h under nitrogen protection, filtered, washed, and freeze-dried.

6. The non-metallic wire trough with shielding function according to claim 5, characterized in that, The particle size of carbon black is 100-500 nm, and the mass ratio of carbon black, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, N-hydroxysuccinimide, and amino-terminated polyamide amine is 20-40:0.4-0.6:0.7-1.4:1-5.

7. The non-metallic wire trough with shielding function according to claim 5, characterized in that, The solvent is dimethyl sulfoxide; the algebraic number of the terminal amino polyamide amine is 1.5-2.

5.

8. A method for preparing a non-metallic wire trough with shielding function as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Add graphene oxide to a solvent and sonicate for 1-2 hours. Add pyrrole monomer and ammonium persulfate to the solvent. Stir at 60-70℃ for 5-10 hours under nitrogen protection. Adjust the pH of the system to 8-9 during stirring. Centrifuge, wash, and freeze dry to obtain pretreated graphene oxide. S2. Mix polyvinyl chloride, carboxylated styrene-butadiene rubber, methyl methacrylate-butadiene-styrene terpolymer, compatibilizer, activated carbon black, stabilizer, and plasticizer at room temperature for 1-5 minutes, heat to 100-110℃, stir for 5-12 minutes, and cool to 40-50℃ to obtain a premix. S3. Extrude the premixed material, cool and cut it into pellets, and shape it.

9. The method for preparing a non-metallic wire trough with shielding function according to claim 8, characterized in that, In S1, the solvent is N,N-dimethylformamide.

10. The method for preparing a non-metallic wire trough with shielding function according to claim 8, characterized in that, In S1, the ultrasonic frequency is 400-500W.

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