A lightweight and high-toughness insulating PVC wire material and a preparation method thereof

Abstract

The present application relates to the field of electronic materials, and more specifically, it relates to a lightweight and high-toughness insulating PVC wire material and a preparation method thereof. It is composed of the following raw materials in parts by weight: PVC, lightweight toughening agent, lightweight filler, processing aid, and plasticizer; the lightweight toughening agent is one or more of maleic anhydride grafted SEBS, maleic anhydride grafted EVA, and maleic anhydride grafted polypropylene; the lightweight filler is one or more of light calcium carbonate, insulating hollow microspheres, and hollow silica. Through the interaction between the lightweight toughening agent and the lightweight filler, and with the auxiliary effect of the plasticizer and the processing aid, the PVC wire material is obtained, which has the advantages of lightweight, good toughness, and good insulation. It is used in cables to reduce the possibility of cracking and breakage of the PVC wire sheath, improve the durability of the PVC wire sheath under continuous shaking, and at the same time maintain the flexibility and lightness of the cable, thereby improving the safety and service life of the cable.

Description

Technical Field

[0001] The present application relates to the field of electronic materials, and more specifically, to a lightweight and high-toughness insulating PVC wire material and a preparation method thereof. Background Art

[0002] PVC has the advantages of low cost, good flame retardancy, temperature resistance, durability, environmental protection and easy recycling, so it is widely used in the coating of electronic wires and cables. PVC wire material is often used to coat cables to form PVC wire sheath. The PVC wire sheath of the cable is an important protective layer to protect the wires inside the cable, and plays the role of moisture-proof, anti-corrosion, anti-aging, insulation, etc. It can also prevent the wires from being exposed and damaged, and improve the safety and service life of the cable.

[0003] If the PVC sheath is damaged, the cable will be easily exposed and scratched, which may cause short circuit or fire and other safety accidents, thus affecting the safe use of the cable. In addition, the damaged PVC sheath will accelerate the pollution and aging of the wires, shortening the service life of the cable. Since cables are widely used, they need to have good insulation properties to ensure the safety and stability of current transmission. However, cables made of PVC wire materials are prone to breakage and damage when facing the continuous shaking caused by equipment operation or shaking caused by environmental influences, which may easily lead to leakage and line failure.

[0004] At present, in order to solve the above problems, the mechanical strength of PVC cable is enhanced by increasing the thickness of PVC cable sheath or using tough materials. Although it can reduce the possibility of breakage to a certain extent, the weight and rigidity of the cable are also increased, which is not conducive to the arrangement and use of the cable in complex environments.

[0005] With the rapid development of science and technology, various electronic products are oriented towards lightweight, high quality, high performance, etc. Therefore, the wire materials of electronic products also tend to be lightweight. At present, ABS high-rubber powder, epoxy resin toughening agent, powdered nitrile rubber, CPE, phenolic resin toughening agent, etc. are used to improve the toughness of PVC, which can also reduce the weight of PVC to a certain extent and avoid the violent shaking of the wire materials. However, when the cables produced by PVC wire materials are in continuous shaking for a long time, they are still prone to cracking and breakage, which reduces the durability of the cables. Therefore, further research on PVC wire materials is needed. Summary of the invention

[0006] In order to obtain a relatively light, flexible and insulating PVC wire material, the present application provides a lightweight and high-toughness insulating PVC wire material and a preparation method thereof.

[0007] In the first aspect, a lightweight high-toughness insulating PVC wire material is composed of the following raw materials in parts by weight: PVC 50-55 parts

[0008] Lightweight toughening agent 5-18 parts

[0009] Lightweight filler 19-28 parts

[0010] Processing aids 5.8-10.7 parts

[0011] Plasticizer 22-29 parts;

[0012] The lightweight toughening agent is one or more of maleic anhydride grafted SEBS, maleic anhydride grafted EVA, and maleic anhydride grafted polypropylene;

[0013] The lightweight filler is one or more of light calcium carbonate, insulating hollow microspheres, and hollow silica.

[0014] In the above technical scheme, maleic anhydride grafted SEBS, maleic anhydride grafted EVA, and maleic anhydride grafted polypropylene all have better toughening effect, and have the advantages of light weight and good compatibility compared with PVC, and the density of maleic anhydride grafted SEBS, maleic anhydride grafted EVA, and maleic anhydride grafted polypropylene is less than 1kg / m 3 , therefore, the obtained PVC strands are lighter;

[0015] Light calcium carbonate, insulating hollow microspheres and hollow silica all have good insulation, light weight, reinforcement and toughening properties, and their density is lighter than that of solid fillers such as silica, which further reduces the weight of PVC wire materials, making the cables lighter, reducing the amplitude of shaking, and reducing the possibility of cracking in the PVC wire sheath.

[0016] Therefore, by using one or more lightweight toughening agents selected from maleic anhydride grafted SEBS, maleic anhydride grafted EVA, and maleic anhydride grafted polypropylene, and combining them with one or more lightweight fillers selected from light calcium carbonate, insulating hollow microspheres, and hollow silica, the light calcium carbonate, insulating hollow microspheres, and hollow silica are fully and uniformly mixed in the wire material raw material system, so that the obtained PVC wire material has the advantages of lightweight, good flexibility, good insulation, etc.

[0017] In summary, maleic anhydride grafted SEBS, maleic anhydride grafted EVA, and maleic anhydride grafted polypropylene are used as lightweight toughening agents, and high-quality calcium carbonate, insulating hollow microspheres, and hollow silica are used as lightweight fillers, and with the assistance of plasticizers and processing aids, the obtained wire materials have the advantages of lightweight, good toughness, and good insulation. When used in cables, they can reduce the vibration amplitude of the cables, reduce the possibility of cracking and breakage of the PVC sheath, and improve the durability of the PVC sheath of the cables in a continuous shaking environment. At the same time, the flexibility and lightness of the cables are maintained, and the safety and service life of the cables are improved.

[0018] The high toughness in this application means that the toughness of the prepared insulating PVC wire material is higher than that of pure PVC, and it is relatively soft and can be arranged and used in complex environments.

[0019] Preferably, the weight ratio of maleic anhydride grafted SEBS, maleic anhydride grafted EVA, and maleic anhydride grafted polypropylene is (5-10):(2-5):(1-3).

[0020] When maleic anhydride grafted SEBS, maleic anhydride grafted EVA, and maleic anhydride grafted polypropylene are used, the lightweight filler is fully mixed with the PVC strand material system, and at the same time, it has a better toughening effect on PVC, thereby making the PVC strand material have the advantages of good flexibility and good insulation.

[0021] Preferably, the weight ratio of the light calcium carbonate, insulating hollow microspheres and hollow silica is 1:(1.6-3):(1-2).

[0022] When light calcium carbonate, insulating hollow microspheres and hollow silica play a synergistic role and are combined with lightweight toughening agents, the resulting PVC wire material has the characteristics of good flexibility, good insulation and light weight.

[0023] Preferably, the insulating hollow microspheres are prepared from the following raw materials in parts by weight:

[0024] Organic polyborosilazane 0.1-0.3 parts

[0025] Perhydropolysilazane 0.2-0.5 parts

[0026] Catalyst 0.001-0.003 parts

[0027] Insulation filler 10-20 parts

[0028] 3-5 parts of pore-forming agent

[0029] 1-3 parts of solvent.

[0030] Preferably, the insulating filler is composed of at least two of hexagonal boron nitride, zirconium oxide, silicon nitride and γ-alumina.

[0031] Preferably, the weight ratio of hexagonal boron nitride, zirconium oxide, silicon nitride and γ-alumina is (3-6):(1-3):(1-5):(4-6).

[0032] Preferably, the pore-forming agent is wood flour.

[0033] Preferably, the insulating hollow microspheres are prepared by the following method:

[0034] Weigh the pore-forming agent and insulating filler, mix them evenly, and grind them to obtain a mixture A; weigh the organic polyborosilazane, perhydropolysilazane, solvent, catalyst and all the mixture A, mix them evenly, sinter, form pores, crush, and grind them to obtain insulating hollow microspheres.

[0035] The above technical scheme adopts hexagonal boron nitride, zirconium oxide, silicon nitride, and γ-alumina, all of which have good insulation properties. When the two are compounded, they play a synergistic role. When hexagonal boron nitride, zirconium oxide, silicon nitride, and γ-alumina are compounded, they play a better insulation performance, toughening performance, etc., and cooperate with organic polyborosilazane, perhydropolysilazane, and pore-forming agent. With the assistance of catalysts and solvents, after sintering, pore-forming, grinding, ball grinding and other processes, insulating hollow microspheres with good insulation, good filling reinforcement, and light weight are obtained, and interact with lightweight toughening agents to play a better synergistic role, thereby making the insulation and flexibility of the PVC wire material better and having the characteristics of lightweight.

[0036] Therefore, the PVC wire sheath formed by the cable covered with PVC wire material also has better flexibility, insulation and lightness, which improves the durability of the PVC wire sheath under continuous shaking of the cable, while maintaining the flexibility and lightness of the cable, thereby improving the safety and service life of the cable.

[0037] Preferably, the processing aid is composed of the following raw materials in parts by weight:

[0038] Flame retardant 1-2 parts

[0039] 3-6 parts of stabilizer

[0040] Lubricant 0.8-1.2 parts

[0041] Colorant 1-1.5 parts.

[0042] The above flame retardants, stabilizers, lubricants and colorants are used to assist and stabilize the processing, and lightweight plasticizers and lightweight fillers are added, so that the prepared PVC wire material has the advantages of lightweight, good flexibility and good insulation.

[0043] In a second aspect, the present application provides a method for preparing a lightweight and high-toughness insulating PVC wire material, comprising the following steps:

[0044] PVC, lightweight toughening agent, lightweight filler, processing aid and plasticizer are weighed and mixed evenly according to weight parts, melt-extruded, cooled and granulated to obtain insulating PVC wire material.

[0045] The above-mentioned preparation method can make the materials fully and evenly mixed, so that the obtained PVC wire material has the advantages of light weight, good flexibility and good insulation. Therefore, the PVC wire sheath formed by the cable coated with PVC wire material also has good flexibility, insulation and light weight, which improves the durability of the PVC wire sheath under continuous shaking of the cable, while maintaining the flexibility and lightness of the cable, thereby improving the safety and service life of the cable.

[0046] In summary, this application has the following beneficial effects:

[0047] 1. By using maleic anhydride grafted SEBS, maleic anhydride grafted EVA, and maleic anhydride grafted polypropylene as lightweight toughening agents, and calcium carbonate, insulating hollow microspheres, and hollow silica as lightweight fillers, and with the assistance of plasticizers and processing aids, the obtained wire materials have the advantages of lightweight, good toughness, and good insulation. When used in cables, they can reduce the vibration amplitude of the cables, reduce the possibility of cracking and breakage of the PVC sheath, and improve the durability of the PVC sheath of the cables in a continuous shaking environment. At the same time, the flexibility and lightness of the cables are maintained, and the safety and service life of the cables are improved.

[0048] 1. Hexagonal boron nitride, zirconium oxide, silicon nitride and γ-alumina all have good insulation properties. When the two are compounded, they play a synergistic role. When hexagonal boron nitride, zirconium oxide, silicon nitride and γ-alumina are compounded, they play a better insulation performance, toughening performance, etc., and with organic polyborosilazane, perhydropolysilazane, pore-forming agent, under the auxiliary action of catalyst and solvent, after sintering, pore-forming, grinding, ball grinding and other processes, insulating hollow microspheres with good insulation, good filling reinforcement and light weight are obtained, and interact with lightweight toughening agent to play a better synergistic role, thereby making the insulation and flexibility of PVC wire material better and having the characteristics of lightweight.

[0049] Therefore, the PVC wire sheath formed by the cable covered with PVC wire material also has better flexibility, insulation and lightness, which improves the durability of the PVC wire sheath under continuous shaking of the cable, while maintaining the flexibility and lightness of the cable, thereby improving the safety and service life of the cable. DETAILED DESCRIPTION

[0050] The present application is further described in detail below with reference to the embodiments.

[0051] Some material introduction table;

[0052] Table 1 Introduction of some materials

[0053]

[0054] Preparation Example of Insulating Hollow Microspheres Preparation Example 1

[0055] Insulating hollow microspheres are prepared by the following method:

[0056] 3 kg of wood powder and 10 kg of insulating filler were weighed and put into a grinder for grinding, and the mixture was fully mixed to obtain a mixture A with an average particle size of 100 nm; 0.1 kg of organic polyborosilazane, 0.2 kg of perhydropolysilazane, 1 kg of acetone, and 0.001 kg of platinum catalyst were weighed and added into a ball grinding device for 1 hour to fully mix the materials, and then transferred to a sintering furnace for vacuum sintering at argon gas and a temperature of 100°C for 30 minutes, at which time the acetone was completely volatilized and fine pores were formed, and then heated to 680°C at 10°C / min and sintered for 2 hours to volatilize the wood powder and form pores, and then heated to 1000°C and sintered for 1 hour to obtain a pore-forming embryo;

[0057] The pore-forming embryos were placed in a grinder and crushed into 50-mesh particles; the particles were then placed in a ball mill and ball-milled for 2 hours, and sieved through 500 meshes to obtain insulating hollow microbeads.

[0058] The insulating filler is composed of hexagonal boron nitride and gamma-alumina in a weight ratio of 1:5.

[0059] Preparation Example 2

[0060] The difference between Preparation Example 2 and Preparation Example 1 is that the amounts of raw materials used are different, specifically as follows: 4 kg wood powder, 15 kg insulating filler; 0.2 kg organic polyborosilazane, 0.4 kg perhydropolysilazane, 2 kg acetone, and 0.002 kg platinum catalyst.

[0061] Preparation Example 3

[0062] The difference between Preparation Example 3 and Preparation Example 1 is that the amounts of raw materials used are different, specifically as follows: 5 kg wood powder, 20 kg insulating filler; 0.3 kg organic polyborosilazane, 0.5 kg perhydropolysilazane, 3 kg acetone, and 0.003 kg platinum catalyst.

[0063] Preparation Example 4

[0064] The difference between Preparation Example 4 and Preparation Example 2 is that the insulating filler is composed of 6 kg of hexagonal boron nitride, 1 kg of zirconium oxide, 1 kg of silicon nitride, and 7 kg of γ-alumina.

[0065] Preparation Example 5

[0066] The difference between Preparation Example 5 and Preparation Example 2 is that the insulating filler is composed of 4 kg of hexagonal boron nitride, 2 kg of zirconium oxide, 3 kg of silicon nitride, and 6 kg of γ-alumina.

[0067] Preparation Example 6

[0068] The difference between Preparation Example 6 and Preparation Example 1 is that the insulating filler consists of 3 kg of hexagonal boron nitride, 3 kg of zirconium oxide, 5 kg of silicon nitride, and 4 kg of γ-alumina.

[0069] Example

[0070] Example 1

[0071] A lightweight and high-toughness insulating PVC wire material is prepared by the following method:

[0072] Weigh 50kg PVC, 5kg lightweight toughener, 19kg lightweight filler, 1kg flame retardant, 3kg stabilizer, 0.8kg lubricant, 1kg colorant, and 22kg plasticizer and put them into a high-speed mixer. Stir them at a speed of 150r / min for 5 minutes to fully mix the materials. Transfer them to a twin-screw extruder for melt extrusion at a screw speed of 400 rpm. Cool them in a cold water tank, and then dry them in an oven at 100°C for 10s. Then, granulate them in a granulator to obtain PVC strands.

[0073] The lightweight toughening agent is maleic anhydride grafted SEBS, the lightweight filler is hollow silica, the flame retardant is antimony trioxide, the stabilizer is calcium zinc stabilizer, the lubricant is PE wax, and the plasticizer is composed of epoxidized soybean oil and trioctyl trimellitate in a weight ratio of 1:10.

[0074] Table 2 Extruder temperature settings

[0075] Temperature ℃ Zone 1 Zone 2 Zone 3 District 4 District 5 District 6 District 7 Die head set up 140 145 150 160 168 153 150 150 actual 137 143 148 158 167 150 148 148

[0076] Example 2

[0077] The difference between Example 2 and Example 1 is that the dosage is different, as follows:

[0078] Weigh 53kg PVC, 13kg lightweight toughener, 25kg lightweight filler, 1kg flame retardant, 5kg stabilizer, 1kg lubricant, 1.2kg colorant, and 25kg plasticizer.

[0079] Example 3

[0080] The difference between Example 3 and Example 1 is that the dosage is different, as follows:

[0081] Weigh 55kg PVC, 18kg lightweight toughener, 28kg lightweight filler, 2kg flame retardant, 6kg stabilizer, 1.2kg lubricant, 1.5kg colorant, and 29kg plasticizer.

[0082] Example 4

[0083] The difference between Example 4 and Example 2 is that the lightweight toughening agent is maleic anhydride grafted EVA.

[0084] Example 5

[0085] The difference between Example 5 and Example 2 is that the lightweight toughening agent is maleic anhydride grafted polypropylene.

[0086] Example 6

[0087] The difference between Example 6 and Example 2 is that the lightweight toughening agent is composed of 5kg of maleic anhydride grafted SEBS, 5kg of maleic anhydride grafted EVA, and 3kg of maleic anhydride grafted polypropylene.

[0088] Example 7

[0089] The difference between Example 7 and Example 2 is that the lightweight toughening agent is composed of 8 kg of maleic anhydride grafted SEBS, 3 kg of maleic anhydride grafted EVA, and 2 kg of maleic anhydride grafted polypropylene.

[0090] Example 8

[0091] The difference between Example 8 and Example 2 is that the lightweight toughening agent is composed of 10 kg of maleic anhydride grafted SEBS, 2 kg of maleic anhydride grafted EVA, and 1 kg of maleic anhydride grafted polypropylene.

[0092] Example 9

[0093] The difference between Example 9 and Example 7 is that the lightweight filler is light calcium carbonate.

[0094] Example 10

[0095] The difference between Example 10 and Example 7 is that the lightweight filler is hollow silica.

[0096] Embodiment 11

[0097] The difference between Example 11 and Example 7 is that the lightweight filler consists of 5 kg of light calcium carbonate, 8 kg of insulating hollow microspheres, and 12 kg of hollow silica.

[0098] Example 12

[0099] The difference between Example 12 and Example 7 is that the lightweight filler consists of 4 kg of light calcium carbonate, 13 kg of insulating hollow microspheres, and 8 kg of hollow silica.

[0100] Embodiment 13

[0101] The difference between Example 13 and Example 7 is that the lightweight filler consists of 5 kg of light calcium carbonate, 15 kg of insulating hollow microspheres, and 5 kg of hollow silica.

[0102] Examples 14-19

[0103] The difference between Examples 14-19 and Example 12 is that the sources of the insulating hollow microspheres are different, as shown in Table 2;

[0104] Table 2 Sources of insulating hollow microspheres of Examples 14-19

[0105] Example Source of insulating hollow microspheres Embodiment 14 Preparation Example 1 Embodiment 15 Preparation Example 2 Example 16 Preparation Example 3 Embodiment 17 Preparation Example 4 Embodiment 18 Preparation Example 5 Embodiment 19 Preparation Example 6

[0106] Comparative Example

[0107] Comparative Example 1

[0108] The difference between Comparative Example 1 and Example 1 is that the lightweight toughening agent is replaced by ABS high-rubber powder in equal amount.

[0109] Comparative Example 2

[0110] The difference between Comparative Example 2 and Example 1 is that the lightweight toughening agent is replaced by chlorinated polyethylene in equal amount.

[0111] Comparative Example 3

[0112] The difference between Comparative Example 3 and Example 1 is that the lightweight filler is replaced by silicon dioxide in equal amounts.

[0113] Comparative Example 4

[0114] The difference between Comparative Example 4 and Example 1 is that the lightweight toughening agent is replaced by a lightweight filler in equal amounts.

[0115] Performance testing

[0116] The PVC strands obtained in Examples 1-19 and 1-4 were injection molded to form test specimens, and then subjected to the following experimental tests.

[0117] Detection method / test method

[0118] 1. Shaking test

[0119] The copper wire core was coated with the PVC wire material obtained in Examples 1-19 and 1-4 to form a cable, with a 0.8 mm thick PVC wire material layer on the cable, and the weight of the cable was 17 g / m, and then a shaking test was performed;

[0120] Use a wire swing tester. When the cable enters the interface, it will not bend excessively. Add a heavy object to the soft cable as a load, so that the applied force is 5N. Use a clamp plate R = 10mm swing mechanism to swing 180° (90° on both sides of the plumb line). The number of swings is 10,000 times, and the swing rate is 100 times per minute. During the test, a current of 1A is required. A swing is a forward or backward movement. After 100,000 shakes, check whether the PVC wire material layer is separated from the body, broken, or bubbled. If there is no such phenomenon, observe after every 5,000 shakes until the above phenomenon occurs, and record the number of times.

[0121] 2. Volume resistance

[0122] Refer to GB / T 1410-2006 for volume resistance testing.

[0123] 3. Mechanical properties

[0124] Refer to GB / T 2951.1-1997 standard to test elongation at break and tensile strength;

[0125] Table 3 Experimental data of Examples 1-19 and Comparative Examples 1-4

[0126]

[0127]

[0128] Combining Example 1 and Comparative Examples 1-2 and Table 1, it can be seen that the number of swings, volume resistance, elongation at break, and tensile strength of Comparative Examples 1-2 are all lower than those of Example 1, indicating that the use of the lightweight toughening agent of the present application has a better toughening effect, and in combination with the lightweight filler of the present application, the insulation, flexibility, and resistance to continuous swing of the PVC wire sheet of the cable are better.

[0129] Combining Example 1 and Comparative Examples 3-4 and Table 3, it can be seen that the number of swings, volume resistivity, and elongation at break of Comparative Examples 3-4 are lower than those of Example 1, indicating that the lightweight toughening agent and lightweight filler compound of the present application play a better role, thereby making the performance of the PVC strands better.

[0130] Combining Example 2 and Example 6 and Table 3, it can be seen that the number of swings, volume resistivity, elongation at break, and tensile strength of Example 2 are all lower than those of Example 6, indicating that the maleic anhydride grafted SEBS, maleic anhydride grafted EVA, and maleic anhydride grafted polypropylene used in the present application are compounded to achieve a better synergistic effect, and are compounded with lightweight fillers to obtain PVC strands with better performance.

[0131] Combining Example 7 and Example 11 and Table 3, it can be seen that the number of swings, volume resistivity, elongation at break, and tensile strength of Example 7 are lower than those of Example 11, indicating that the PVC strands obtained by compounding light calcium carbonate, insulating hollow microspheres, and hollow silica have better performance.

[0132] Combining Example 12 and Example 14 and Table 3, it can be seen that the number of swings, volume resistivity, elongation at break, and tensile strength of Example 12 are all lower than those of Example 14, indicating that the performance of the PVC wire obtained by the preparation method of the present application is better.

[0133] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A lightweight and high-toughness insulating PVC wire material, characterized in that: It is composed of the following raw materials in parts by weight: PVC50-55 parts Lightweight toughening agent 5-18 parts Lightweight filler 19-28 parts Processing aids 5.8-10.7 parts 22-29 parts of plasticizer; The lightweight toughening agent is one or more of maleic anhydride grafted SEBS, maleic anhydride grafted EVA, and maleic anhydride grafted polypropylene; The lightweight filler is composed of light calcium carbonate, insulating hollow microspheres, and hollow silica in a weight ratio of 1:(1.6-3):(1-2); The insulating hollow microspheres are prepared from the following raw materials in parts by weight: Organic polyborosilazane 0.1-0.3 parts Perhydropolysilazane 0.2-0.5 parts Catalyst 0.001-0.003 parts Insulation filler 10-20 parts 3-5 parts of pore-forming agent 1-3 parts of solvent; The insulating filler is composed of at least two of hexagonal boron nitride, zirconium oxide, silicon nitride, and γ-alumina; The pore-forming agent is wood flour; The insulating hollow microspheres are prepared by the following method: Weigh the pore-forming agent and insulating filler, mix them evenly, and grind them to obtain a mixture A; weigh the organic polyborosilazane, perhydropolysilazane, solvent, catalyst and all the mixture A, mix them evenly, sinter, form pores, crush, and grind them to obtain insulating hollow microspheres.

2. The lightweight and high-toughness insulating PVC wire material according to claim 1, characterized in that: The weight ratio of the maleic anhydride grafted SEBS, maleic anhydride grafted EVA, and maleic anhydride grafted polypropylene is (5-10):(2-5):(1-3).

3. The lightweight and high-toughness insulating PVC wire material according to claim 1, characterized in that: The weight ratio of hexagonal boron nitride, zirconium oxide, silicon nitride and γ-alumina is (3-6):(1-3):(1-5):(4-6).

4. The lightweight and high-toughness insulating PVC wire material according to claim 1, characterized in that: The processing aid is composed of the following raw materials in parts by weight: Flame retardant 1-2 parts 3-6 parts of stabilizer Lubricant 0.8-1.2 parts Colorant 1-1.5 parts.

5. A method for preparing a lightweight and high-toughness insulating PVC wire material according to any one of claims 1 to 4, characterized in that: The following steps are involved: PVC, lightweight toughening agent, lightweight filler, processing aid and plasticizer are weighed and mixed evenly according to weight parts, melt-extruded, cooled and granulated to obtain insulating PVC wire material.

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