High-weather-resistance polyvinyl chloride cable material and preparation method thereof

Abstract

The application discloses a kind of high weatherability polyvinyl chloride cable material and preparation method thereof, including the following weight parts of component: PVC resin 100 parts;Plasticizing system 35-55 parts;Dynamic crosslinking toughening compound 8-20 parts;Calcium-zinc stabilizer 4-8 parts;Ultraviolet light stabilizing system 0.3-1.5 parts;Flame-retardant-reinforcing synergic system 30-60 parts;Processing lubricating system 1-3 parts.The application constructs dynamic reversible ionic crosslinking network in PVC cable material for the first time, and simultaneously solves the two big problems of small molecule plasticizer migration and low temperature brittleness, unifies the inherent contradiction of cold resistance and anti-migration;Gradient refractive index core-shell toughening agent is designed and applied as "structured ultraviolet trap", and the ultraviolet absorption efficiency is greatly improved through physical optical mechanism, realizes the synergy of toughening and super long weather resistance, and does not depend on excessive carbon black, which provides design space for product color.

Description

Technical Field

[0001] This invention belongs to the field of cable manufacturing technology, specifically relating to a high weather-resistant polyvinyl chloride cable material and its preparation method. Background Technology

[0002] PVC cable materials are widely used due to their low cost and excellent overall performance. With the increasing demand for outdoor PVC cable materials, their weather resistance needs to take into account both UV resistance and cold resistance.

[0003] Existing weather-resistant PVC cable materials mainly use polyester plasticizers, TOTM, DPHP, and soybean oil, which have relatively poor cold resistance. Small-molecule cold-resistant plasticizers such as DOA and DOS, added to meet cold-resistance requirements, have poor compatibility with PVC and are prone to migrating and precipitating to the surface during outdoor use. This not only makes the material itself brittle but also accelerates the damage to the internal structure of the material caused by ultraviolet light, leading to a sharp deterioration in weather resistance. Summary of the Invention

[0004] To address the problems in the prior art, the present invention aims to provide a high weather-resistant polyvinyl chloride cable material and its preparation method.

[0005] To achieve the above objectives and technical effects, the technical solution adopted by this invention is as follows: A high weather-resistant polyvinyl chloride cable material comprises the following components in parts by weight: 100 parts of PVC resin; 35-55 parts of plasticizer system; 8-20 parts of dynamic cross-linked toughening composite; 4-8 parts calcium-zinc stabilizer; 0.3-1.5 parts of the UV-stabilized system; Flame retardant-reinforcing synergistic system, 30-60 parts; Processing lubrication system 1-3 parts.

[0006] Furthermore, the plasticizing system comprises an ethylene terpolymer and a trimellitate plasticizer, wherein the weight ratio of the two is 1:2 to 1:8.

[0007] Furthermore, the ethylene terpolymer is an ethylene-vinyl acetate-carbon monoxide terpolymer and / or an ethylene-n-butyl acrylate-carbon monoxide terpolymer, with a melt index of 2-15 g / 10 min at 190°C and 2.16 kg.

[0008] Furthermore, the dynamic cross-linking toughening composite is a composite formed by pre-dispersing a metal oxide and a core-shell toughening modifier with a gradient refractive index structure.

[0009] Furthermore, the core-shell toughening modifier with a gradient refractive index structure has a shell refractive index of 1.52-1.55 and a core refractive index of 1.45-1.48, and the core layer is encapsulated with an inorganic nano-UV shielding agent.

[0010] Furthermore, the core-shell toughening modifier with a gradient refractive index structure has a core layer that is a cross-linked copolymer of butyl acrylate and allyl methacrylate, and a shell layer that is a copolymer of methyl methacrylate, styrene and fluorinated acrylate, and the shell layer contains chemically bonded benzotriazole ultraviolet light absorbing monomers.

[0011] Furthermore, the metal oxide accounts for 5-15% of the total weight of the dynamic cross-linking toughening composite, and the metal oxide is nano zinc oxide and / or nano magnesium oxide.

[0012] Furthermore, the ultraviolet light stabilizing system comprises an ultraviolet light absorber and a hindered amine light stabilizer in a weight ratio of 1:0.5-1:2, with 30-50% of the total amount of ultraviolet light absorber being chemically bonded or physically encapsulated in the shell of the core-shell toughening modifier.

[0013] This invention also discloses a method for preparing high weather-resistant polyvinyl chloride cable material as described above, comprising the following steps: (1) Add PVC resin, calcium-zinc stabilizer, UV stabilizer and processing lubrication system to a mixer, stir at low speed and heat to 70-80℃, add trimellitate plasticizer, and stir at high speed until the material is fully absorbed; (2) Heat to 100-110℃, add flame retardant-reinforcing synergistic system, and continue high-speed stirring; (3) Heat to 120-130℃, add dynamic cross-linking toughening compound and ethylene terpolymer, stir at high speed for 15-30s and then immediately discharge to cooling mixer; (4) The mixture cooled to 40-60℃ is fed into a twin-screw extruder, plasticized and extruded at 140-170℃, and then granulated and air-cooled by a single-screw granulator to obtain high weather-resistant polyvinyl chloride cable material.

[0014] Furthermore, during the plasticizing process in step (3), the metal oxides in the dynamic crosslinking toughening composite undergo an in-situ ionic crosslinking reaction with the PVC resin and ethylene terpolymer to form a dynamic and reversible ionic crosslinking network.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention is the first to construct a dynamic and reversible ionic crosslinking network in PVC cable material, simultaneously solving the two major problems of small molecule plasticizer migration and low-temperature brittleness, and unifying the inherent contradiction between cold resistance and migration resistance. It designs and applies a gradient refractive index core-shell toughening agent as a "structured ultraviolet trap", which greatly improves the ultraviolet absorption efficiency through physical optical mechanisms, achieving synergy between toughening and ultra-long weather resistance, and does not rely on excessive carbon black, providing design space for product color. Detailed Implementation

[0016] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0017] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0018] This invention discloses a high weather-resistant polyvinyl chloride cable material, comprising the following components in parts by weight: 100 parts of PVC resin; 35-55 parts of plasticizer system; 8-20 parts of dynamic cross-linked toughening composite; 4-8 parts calcium-zinc stabilizer; 0.3-1.5 parts of the UV-stabilized system; Flame retardant-reinforcing synergistic system, 30-60 parts; Processing lubrication system 1-3 parts.

[0019] In some embodiments, the plasticizing system comprises an ethylene terpolymer and a trimellitate plasticizer in a weight ratio of 1:2 to 1:8.

[0020] In some specific embodiments, the ethylene terpolymer is an ethylene-vinyl acetate-carbon monoxide terpolymer and / or an ethylene-n-butyl acrylate-carbon monoxide terpolymer, with a melt index of 2-15 g / 10 min at 190°C and 2.16 kg.

[0021] In some embodiments, the dynamic crosslinking toughening composite is a composite formed by pre-dispersing a metal oxide and a core-shell toughening modifier with a gradient refractive index structure, wherein the shell refractive index of the core-shell toughening modifier is 1.52-1.55, which is higher than the core refractive index (1.45-1.48), and the core layer is coated with an inorganic nano-UV shielding agent.

[0022] In some specific implementations, the metal oxide accounts for 5-15% of the total weight of the dynamically cross-linked toughening composite.

[0023] In some specific embodiments, the metal oxide is nano zinc oxide and / or nano magnesium oxide.

[0024] In some specific embodiments, the core-shell toughening modifier with a gradient refractive index structure has a core layer that is a cross-linked copolymer of butyl acrylate and allyl methacrylate, and a shell layer that is a copolymer of methyl methacrylate, styrene and fluorinated acrylate, and the shell layer contains chemically bonded benzotriazole ultraviolet light absorbing monomers.

[0025] In some specific embodiments, the core-shell toughening modifier with a gradient refractive index structure is prepared by a multi-step seed emulsion polymerization method, the specific steps of which are as follows: 1) Preparation of core layer emulsion (low refractive index 1.45-1.48, encapsulating inorganic nano-UV shielding agent) raw material: Monomers: 80-90 parts butyl acrylate, 2-5 parts allyl methacrylate; Inorganic nano UV shielding agent: 5-15 parts of nano titanium dioxide (rutile type); Emulsifier: Sodium dodecyl sulfate 0.5-1.5 parts; Initiator: 0.1-0.5 parts potassium persulfate; Deionized water: 150-200 parts; Process: By weight, 80-90 parts of butyl acrylate and 2-5 parts of allyl methacrylate are mixed with 5-15 parts of nano titanium dioxide and ultrasonically dispersed in an ice bath for 20-40 minutes to form a pre-dispersion. The pre-dispersion, 0.5-1.5 parts of sodium dodecyl sulfate, and 150-200 parts of deionized water are added to a reactor and stirred and pre-emulsified under nitrogen protection for 20-40 minutes. The temperature is raised to 75-80℃, and 0.1-0.5 parts of potassium persulfate are added to initiate polymerization. The reaction is carried out for 1-1.5 minutes to obtain a core layer emulsion. 2) Preparation of shell emulsion (high refractive index 1.52-1.55) raw material: Monomers: 50-70 parts methyl methacrylate, 10-25 parts styrene, 10-20 parts fluorinated acrylates (such as hexafluorobutyl methacrylate); Benzotriazole UV-absorbing monomers: such as 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl]-2H-benzotriazole, etc., 1-5 parts; Grafting agent: 1-3 parts allyl methacrylate; Emulsifier: Sodium dodecyl sulfate 0.5-1 part; Initiator: 0.1-0.3 parts potassium persulfate; Deionized water: 50-80 parts; Process: Mix all shell monomers (50-70 parts methyl methacrylate, 10-25 parts styrene, 10-20 parts fluorinated acrylate (such as hexafluorobutyl methacrylate), 1-5 parts benzotriazole UV-absorbing monomers, 1-3 parts allyl methacrylate, and 0.5-1 parts sodium dodecyl sulfate and pre-emulsify for 20-40 minutes to obtain a shell pre-emulsion; at 75-80℃, slowly add the shell pre-emulsion and 0.1-0.3 parts potassium persulfate separately to the core emulsion simultaneously over a period of 3-4 hours, and then allow to mature at this temperature for 1-1.5 hours. 3) Cool down to below 40℃, demulsify with 10% calcium chloride aqueous solution, wash with deionized water, filter, and dry in a vacuum drying oven at 60-70℃ for 20-30 hours to obtain the powdered product.

[0026] In some embodiments, the UV stabilizing system comprises a UV absorber and a hindered amine light stabilizer in a weight ratio of 1:0.5 to 1:2, wherein 30-50% of the total amount of the UV absorber is chemically bonded or physically encapsulated in the shell of the core-shell toughening modifier.

[0027] In some embodiments, the processing lubrication system is a compound of polyethylene wax, calcium stearate, and vinyl bis-stearamide in a weight ratio of 1:0.8-1:0.5-1.

[0028] This invention discloses a method for preparing high weather-resistant polyvinyl chloride cable material, comprising the following steps: (1) By weight, add 100 parts of PVC resin, 4-8 parts of calcium-zinc stabilizer, 0.3-1.5 parts of UV stabilizer system and 1-3 parts of processing lubrication system to a mixer, stir at low speed (100-150 r / min) and heat to 70-80℃, add trimellitate plasticizer, and stir at high speed (800-1200 r / min) until the material is fully absorbed; (2) Heat to 100-110℃, add 30-60 parts of the flame retardant-reinforcing synergistic system, and continue stirring at high speed (600-900r / min); (3) Heat to 120-130℃, add 8-20 parts of dynamic cross-linking toughening compound and ethylene terpolymer, stir at high speed for 15-30s and then immediately discharge to cooling mixer; (4) The mixture cooled to 40-60℃ is fed into a twin-screw extruder, plasticized and extruded at 140-170℃, and then granulated and air-cooled by a single-screw granulator to obtain high weather-resistant polyvinyl chloride cable material.

[0029] During the plasticizing process in step (3), the metal oxides in the dynamic crosslinking toughening composite undergo an in-situ ionic crosslinking reaction with the PVC resin and ethylene terpolymer to form a dynamic and reversible ionic crosslinking network.

[0030] The core of this invention lies in abandoning the traditional "inert plasticization" and "passive protection" modes, and innovatively introducing two major mechanisms: "reactive plasticization and dynamic cross-linking" and "structured ultraviolet traps." Their working principles are as follows: (I) Formation and function of dynamically reversible ionic cross-linking networks: Ethylene terpolymers containing carbonyl (CO) (such as E / VA / CO or E / nBA / CO) were selected as reactive plasticizers, and a dynamically cross-linked toughening composite was introduced, formed by pre-dispersion of metal oxides and core-shell toughening modifiers with gradient refractive index structures. Under high temperature and shear stress during processing, the metal oxides in the dynamically cross-linked toughening composite undergo in-situ complexation reactions with the allyl chloride structures generated by trace degradation on the PVC chains and the carbonyl groups on the ethylene terpolymer, forming nanoscale ion clusters. These ion clusters serve as physical cross-linking points, constructing a dynamically reversible ionic cross-linked network within the matrix. This network is very robust at low or room temperature, effectively "locking" the migration channels of small molecule plasticizers such as trimellitates, completely solving the problem of cold-resistant plasticizer precipitation. Simultaneously, the network reversibly dissociates at processing temperatures, ensuring good process flowability. More importantly, the ionic cross-linked network itself, as a highly efficient energy dissipation structure, can significantly absorb and disperse impact energy at low temperatures, resulting in a substantial reduction in the low-temperature embrittlement temperature of the material. Thus, this invention achieves two core properties that are contradictory in traditional technologies—high resistance to migration and high cold resistance—simultaneously through a chemical mechanism. (II) Construction and Synergy of Ultraviolet Traps in Gradient Refractive Index Core-Shell Structures: The core-shell toughening modifier in the dynamically cross-linked toughening composite is endowed with the dual functions of gradient refractive index and UV absorber carrier. Its shell layer uses a high-refractive-index (1.52-1.55) copolymer (such as styrene or fluorinated acrylates), which highly matches the refractive index of the PVC matrix (approximately 1.54), ensuring visible light transmittance and allowing the product to be manufactured in color. The core layer is a low-refractive-index (1.45-1.48) cross-linked polyacrylate, internally encapsulating inorganic nano-UV shielding agents such as nano-titanium dioxide. Simultaneously, benzotriazole UV-absorbing monomers are chemically bonded to the shell layer. When UV light enters the material, due to the refractive index difference at the core-shell interface, the light undergoes multiple total internal reflections within the toughening agent particles, forming a "light trap" effect. This causes UV light to repeatedly pass through the high-density UV absorber in the shell layer within the trap, resulting in a geometrically increasing equivalent absorption path length, and the UV energy is efficiently converted into heat energy and dissipated harmlessly. This design achieves a deep synergy between toughening and light stabilization, overturning the traditional formula's simple additive effect and resulting in a qualitative leap in weather resistance.

[0031] Example 1

[0032] A high weather-resistant polyvinyl chloride cable material comprises the following components in parts by weight: 100 parts of PVC resin (SG-5); 40 parts of plasticizer system; Eight parts of the dynamically cross-linked toughening composite; 5 parts calcium-zinc stabilizer; 1.5 parts of the UV-stabilized system; 30 copies of the flame retardant-reinforcement synergistic system; 2.3 parts of the processing lubrication system.

[0033] The plasticizing system comprises an ethylene terpolymer and a trimellitate plasticizer in a weight ratio of 1:4. The ethylene terpolymer is an ethylene-vinyl acetate-carbon monoxide terpolymer E / VA / CO (VA content 28%, CO content 8%, MI=8), comprising 8 parts, and the trimellitate plasticizer is TOTM, comprising 32 parts.

[0034] The dynamic cross-linking toughening composite is a composite formed by pre-dispersion treatment of metal oxide and core-shell toughening modifier with gradient refractive index structure. The metal oxide accounts for 5% of the total weight of the dynamic cross-linking toughening composite, and the metal oxide is nano zinc oxide.

[0035] The core-shell toughening modifier with a gradient refractive index structure has a core layer that is a cross-linked copolymer of butyl acrylate and allyl methacrylate, which encapsulates an inorganic nano-UV shielding agent. The shell layer is a copolymer of methyl methacrylate, styrene and fluorinated acrylate, and contains chemically bonded benzotriazole UV-absorbing monomers.

[0036] The core-shell toughening modifier with a gradient refractive index structure was prepared by a multi-step seed emulsion polymerization method, the specific steps of which are as follows: 1) Preparation of core layer emulsion (low refractive index 1.45, encapsulating inorganic nano-UV shielding agent) raw material: Monomers: 80 parts butyl acrylate, 5 parts allyl methacrylate; Inorganic nano-UV shielding agent: 15 parts of nano-titanium dioxide (rutile type); Emulsifier: 1.5 parts sodium dodecyl sulfate; Initiator: 0.5 parts potassium persulfate; Deionized water: 150-200 parts; Process: By weight, 80 parts of butyl acrylate and 5 parts of allyl methacrylate were mixed with 15 parts of nano titanium dioxide and ultrasonically dispersed in an ice bath for 30 min to form a pre-dispersion. The pre-dispersion, 1.5 parts of sodium dodecyl sulfate and 200 parts of deionized water were added to a reactor and stirred and pre-emulsified for 25 min under nitrogen protection. The temperature was raised to 75°C, and 0.5 parts of potassium persulfate were added to initiate polymerization. The reaction was carried out for 1.5 min to obtain a core layer emulsion. 2) Preparation of shell emulsion (high refractive index 1.52) raw material: Monomers: 50 parts methyl methacrylate, 25 parts styrene, and 20 parts fluorinated acrylate (hexafluorobutyl methacrylate); Benzotriazole UV-absorbing monomers: 2-[2-hydroxy-5-[2-(methacryloyloxy)ethyl]phenyl]-2H-benzotriazole, etc., 5 parts; Grafting agent: 3 parts allyl methacrylate; Emulsifier: 1 part sodium dodecyl sulfate; Initiator: 0.3 parts potassium persulfate; Deionized water: 80 parts; Process: All shell monomers (50 parts methyl methacrylate, 25 parts styrene, 20 parts fluorinated acrylate (hexafluorobutyl methacrylate), 5 parts benzotriazole UV-absorbing monomers, 3 parts allyl methacrylate, and 1 part sodium dodecyl sulfate) were mixed and pre-emulsified for 30 min to obtain a shell pre-emulsion. At 75 °C, the shell pre-emulsion and 0.3 parts potassium persulfate were simultaneously and slowly added dropwise to the core emulsion over a period of 4 h. After the addition was complete, the mixture was kept at this temperature for 1 h to mature. 3) Cool down to 35℃, demulsify with 10% calcium chloride aqueous solution, wash with deionized water, filter, and dry in a vacuum drying oven at 60℃ for 25 hours to obtain the powdered product.

[0037] The UV-stabilized system consists of a UV absorber and a hindered amine light stabilizer (HALS hindered amine) in a weight ratio of 1:0.5. 30-50% of the total UV absorber is chemically bonded or physically encapsulated in the shell of the core-shell toughening modifier.

[0038] The flame retardant-reinforcing synergistic system consists of aluminum hydroxide and calcium carbonate in a weight ratio of 2:1.

[0039] The processing lubrication system is a compound of polyethylene wax, calcium stearate, and vinyl bis-stearamide in a weight ratio of 1:0.8:0.5.

[0040] A method for preparing high weather-resistant polyvinyl chloride cable material includes the following steps: (1) By weight, add 100 parts of PVC resin, 5 parts of calcium-zinc stabilizer, 1.5 parts of UV stabilizer system and 2.3 parts of processing lubrication system to a mixer, stir at low speed (100 r / min) and heat to 70°C, add 32 parts of trimellitate plasticizer, and stir at high speed (800 r / min) until the material is fully absorbed; (2) Heat to 100℃, add 30 parts of the flame retardant-reinforcing synergistic system, and continue stirring at high speed (700r / min); (3) Heat to 120°C, add 8 parts of dynamic cross-linking toughening compound and 8 parts of ethylene terpolymer, continue high-speed stirring for 15s and then immediately discharge to the cooling mixer; (4) The mixture cooled to 40°C is fed into a twin-screw extruder, plasticized and extruded at 140°C, and then granulated and air-cooled by a single-screw granulator to obtain high weather-resistant polyvinyl chloride cable material.

[0041] During the plasticizing process in step (3), the metal oxides in the dynamic crosslinking toughening composite undergo an in-situ ionic crosslinking reaction with the PVC resin and ethylene terpolymer to form a dynamic and reversible ionic crosslinking network.

[0042] Comparative Example 1 The difference between this comparative example and Example 1 is that this comparative example does not contain the dynamic crosslinking toughening compound and ethylene terpolymer, but instead uses equal amounts of ordinary ACR and TOTM, while the rest is the same as in Example 1.

[0043] Comparative Example 2 The difference between this comparative example and Example 1 is that this comparative example uses an equal amount of a mixture of ordinary polyester plasticizer and DOS instead of the plasticizing system of the present invention, and uses an equal amount of CPE instead of the dynamically crosslinked toughening compound. The rest is the same as in Example 1.

[0044] Performance tests were conducted on Example 1 and Comparative Examples 1-2, and the results are shown in Table 1.

[0045] Table 1

[0046] As shown in Table 1, the present invention has achieved unexpected and outstanding results in low-temperature toughness and long-term weather resistance by constructing a dynamic ionic crosslinking network and a gradient refractive index ultraviolet trap, and has successfully suppressed plasticizer migration.

[0047] Any parts or structures not specifically described in this invention can be made using existing technologies or products, and will not be elaborated upon here.

[0048] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A high weather-resistant polyvinyl chloride cable material, characterized in that, Includes the following components in parts by weight: 100 parts of PVC resin; 35-55 parts of plasticizer system; 8-20 parts of dynamic cross-linked toughening composite; 4-8 parts calcium-zinc stabilizer; 0.3-1.5 parts of the UV-stabilized system; Flame retardant-reinforcing synergistic system, 30-60 parts; Processing lubrication system 1-3 parts.

2. The high weather-resistant polyvinyl chloride cable material according to claim 1, characterized in that, The plasticizing system comprises ethylene terpolymer and trimellitate plasticizer, with a weight ratio of 1:2 to 1:

8.

3. The high weather-resistant polyvinyl chloride cable material according to claim 2, characterized in that, The ethylene terpolymer is an ethylene-vinyl acetate-carbon monoxide terpolymer and / or an ethylene-n-butyl acrylate-carbon monoxide terpolymer, with a melt index of 2-15 g / 10 min at 190°C and 2.16 kg.

4. The high weather-resistant polyvinyl chloride cable material according to claim 1, characterized in that, The dynamic cross-linked toughening composite is a composite formed by pre-dispersion treatment of metal oxide and core-shell toughening modifier with a gradient refractive index structure.

5. The high weather-resistant polyvinyl chloride cable material according to claim 4, characterized in that, The core-shell toughening modifier with a gradient refractive index structure has a shell refractive index of 1.52-1.55 and a core refractive index of 1.45-1.48, and the core layer is encapsulated with an inorganic nano-UV shielding agent.

6. The high weather-resistant polyvinyl chloride cable material according to claim 4, characterized in that, The core-shell toughening modifier with a gradient refractive index structure has a core layer that is a cross-linked copolymer of butyl acrylate and allyl methacrylate, and a shell layer that is a copolymer of methyl methacrylate, styrene and fluorinated acrylate, and the shell layer contains chemically bonded benzotriazole ultraviolet light absorbing monomers.

7. The high weather-resistant polyvinyl chloride cable material according to claim 4, characterized in that, The metal oxide accounts for 5-15% of the total weight of the dynamic cross-linking toughening composite, and the metal oxide is nano zinc oxide and / or nano magnesium oxide.

8. The high weather-resistant polyvinyl chloride cable material according to claim 1, characterized in that, The ultraviolet light stabilizing system comprises an ultraviolet light absorber and a hindered amine light stabilizer in a weight ratio of 1:0.5-1:2, with 30-50% of the total amount of ultraviolet light absorber being chemically bonded or physically encapsulated in the shell of the core-shell toughening modifier.

9. A method for preparing the high weather-resistant polyvinyl chloride cable material according to any one of claims 1-8, characterized in that, Includes the following steps: (1) Add PVC resin, calcium-zinc stabilizer, UV stabilizer and processing lubrication system to a mixer, stir at low speed and heat to 70-80℃, add trimellitate plasticizer, and stir at high speed until the material is fully absorbed; (2) Heat to 100-110℃, add flame retardant-reinforcing synergistic system, and continue high-speed stirring; (3) Heat to 120-130℃, add dynamic cross-linking toughening compound and ethylene terpolymer, stir at high speed for 15-30s and then immediately discharge to cooling mixer; (4) The mixture cooled to 40-60℃ is fed into a twin-screw extruder, plasticized and extruded at 140-170℃, and then granulated and air-cooled by a single-screw granulator to obtain high weather-resistant polyvinyl chloride cable material.

10. A method for preparing a high weather-resistant polyvinyl chloride cable material according to claim 9, characterized in that, During the plasticizing process in step (3), the metal oxides in the dynamic crosslinking toughening composite undergo an in-situ ionic crosslinking reaction with the PVC resin and ethylene terpolymer to form a dynamic and reversible ionic crosslinking network.

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