A polypropylene cable insulation material and its preparation method

Abstract

This invention discloses a polypropylene cable insulation material and its preparation method, belonging to the technical field of cable insulation materials. The polypropylene cable insulation material comprises, from the inside out, an insulation layer, a shielding layer, a flame-retardant layer, and a protective layer. The flame-retardant layer comprises: polypropylene: 49-61 parts, KN ​​resin: 20-25 parts, octabromosulfide: 10-15 parts, antioxidant: 1 part, and polyolefin modifier Elevast: 5 parts. The polypropylene, KN resin, and octabromosulfide in the polypropylene cable insulation material work synergistically, giving it both good flame-retardant and mechanical properties. This invention discovers that only by using octabromosulfide, or a octabromosulfide and antimony trioxide composite, as a flame retardant can the flame-retardant performance be improved without reducing the toughness of the polypropylene cable insulation material. Furthermore, adding single-walled carbon nanotubes to the shielding layer can improve the electromagnetic shielding performance of the polypropylene cable insulation material.

Description

Technical Field

[0001] This invention relates to the field of cable insulation materials, and in particular to a polypropylene cable insulation material and its preparation method. Background Technology

[0002] Polypropylene (PP) is a common thermoplastic material with good chemical resistance and electrical insulation. Isotactic polypropylene, in particular, has a melting temperature above 160℃, meeting the requirements of cables operating at higher temperatures and allowing continuous operation in environments up to 90℃. This excellent high-temperature resistance of polypropylene is significant for improving cable operating voltage and line current carrying capacity. Furthermore, polypropylene's breakdown strength can reach approximately 300kV / mm, and its volume resistivity does not change significantly with increasing temperature. In addition, polypropylene does not require cross-linking for use in high-temperature environments, and cables can be recycled and re-thermoplasticized after long-term use and retirement, aligning with environmental protection trends.

[0003] However, polypropylene's high crystallinity and insufficient molecular chain flexibility result in high modulus, high rigidity, and poor toughness, causing significant difficulties in the manufacturing, transportation, installation, and operation of wires and cables. Furthermore, polypropylene's insufficient toughness in low-temperature environments makes it prone to brittle cracking.

[0004] Existing technologies often utilize elastomers such as ethylene propylene diene monomer (EPDM) and ethylene octene copolymer (POE) to toughen polypropylene, reducing its modulus and improving its toughness. However, after EPDM and POE toughen and modify polypropylene, charge easily accumulates at the interface between the elastomers EPDM / POE and polypropylene, leading to a significant reduction in the breakdown strength of the blend. Further dielectric compensation is required. Furthermore, polypropylene cable insulation materials need high flame retardant properties, but polypropylene itself is flammable, with a low oxygen index, high exothermic combustion, high oxygen consumption during combustion, and a rapid combustion rate. Current polypropylene cable insulation technologies require the addition of 20wt%–30wt% flame retardants to improve the flame retardant performance of polypropylene. However, the addition of flame retardants is difficult to disperse evenly within the matrix, resulting in a significant decrease in the mechanical and electrical properties of the blend, failing to meet the requirements for cable use.

[0005] Therefore, it is of great significance to develop and research a polypropylene cable insulation material with excellent flexibility, heat resistance, flame retardancy, insulation and mechanical properties. Summary of the Invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide a polypropylene cable insulation material and a method for preparing the same. The polypropylene cable insulation material simultaneously possesses good flame retardant properties, electromagnetic shielding properties, and mechanical properties.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] This invention provides a polypropylene cable insulation material, which comprises, from the inside out, an insulation layer, a shielding layer, a flame-retardant layer, and a protective layer.

[0009] This invention is the first to combine KN resin and octabromosulfide with polypropylene. Polypropylene has good compatibility with KN resin and octabromosulfide, and the three work synergistically to significantly improve mechanical properties and flame retardant properties.

[0010] Preferably, the flame-retardant layer of the present invention comprises, by weight, the following components:

[0011] Polypropylene: 49–61 parts;

[0012] KN resin: 20-25 parts;

[0013] Octabromosulfide: 10-15 parts;

[0014] Antioxidant: 1-3 parts;

[0015] Elevast, a polyolefin modifier: 3-5 parts.

[0016] Preferably, the flame-retardant layer of the present invention further includes the following components:

[0017] Antimony trioxide: 3-5 parts.

[0018] The composite flame retardant composed of antimony trioxide and octabromosulfide also has a good flame retardant effect, which is beneficial to improving the flame retardant performance of the polypropylene cable insulation material of the present invention.

[0019] The inventors of this invention discovered that using other flame retardants results in poor flame retardant performance of polypropylene cable insulation materials, and also reduces the toughness of polypropylene cable insulation materials. Only by using octabromosulfide, or a compound of octabromosulfide and antimony trioxide, can the flame retardant performance be improved without reducing the toughness of polypropylene cable insulation materials.

[0020] More preferably, the flame-retardant layer of the present invention comprises, by weight, the following components:

[0021] Polypropylene: 50-55 parts;

[0022] KN resin: 22-25 parts;

[0023] Octabromosulfide: 10-15 parts;

[0024] Antioxidant: 1-3 parts;

[0025] Elevast, a polyolefin modifier: 3-5 parts.

[0026] In a further preferred embodiment of the present invention, the flame-retardant layer comprises, by weight, the following components:

[0027] Polypropylene: 54 parts;

[0028] KN resin: 25 parts;

[0029] Octabromosulfide: 15 parts;

[0030] Antioxidant: 1 part;

[0031] Elevast, a polyolefin modifier: 5 parts.

[0032] In a further preferred embodiment of the present invention, the flame-retardant layer comprises, by weight, the following components:

[0033] Polypropylene: 54 parts;

[0034] KN resin: 25 parts;

[0035] Octabromosulfide: 10 parts;

[0036] Antimony trioxide: 5 parts;

[0037] Antioxidant: 1 part;

[0038] Elevast, a polyolefin modifier: 5 parts.

[0039] Preferably, the shielding layer of the present invention contains single-walled carbon nanotubes, polypropylene, and KN resin.

[0040] The single-walled carbon nanotubes are used in combination with polypropylene, KN resin, and octabromosulfide (or a composite of octabromosulfide and antimony trioxide) to give the polypropylene cable insulation material better conductivity, thereby significantly improving its electromagnetic shielding performance.

[0041] Preferably, the shielding layer of the present invention comprises, by weight, the following components:

[0042] Polypropylene: 29–44 parts;

[0043] KN resin: 15-20 parts;

[0044] Single-walled carbon nanotubes: 30–40 parts;

[0045] Antioxidant: 1-3 parts;

[0046] Elevast, a polyolefin modifier: 5-10 parts.

[0047] Preferably, the insulating layer comprises, by weight, the following components:

[0048] Polypropylene: 66.5–76.5 parts;

[0049] KN resin: 20-30 parts;

[0050] Antioxidant: 0.5–3 parts;

[0051] Elevast, a polyolefin modifier: 3-5 parts.

[0052] Preferably, the protective layer comprises, by weight, the following components:

[0053] Polypropylene: 66-76 parts;

[0054] KN resin: 20-30 parts;

[0055] Antioxidant: 0.5–3 parts;

[0056] UV protectant: 0.5–3 parts;

[0057] Elevast, a polyolefin modifier: 3-5 parts.

[0058] More preferably, the shielding layer of the present invention comprises, by weight, the following components: polypropylene: 34 parts;

[0059] KN resin: 15 parts;

[0060] Single-walled carbon nanotubes: 40 parts;

[0061] Antioxidant: 1 part;

[0062] Elevast, a polyolefin modifier: 10 parts;

[0063] The insulating layer, by weight, comprises the following components:

[0064] Polypropylene: 66.5 parts;

[0065] KN resin: 30 parts;

[0066] Antioxidant: 0.5 parts;

[0067] Elevast, a polyolefin modifier: 3 parts;

[0068] The protective layer, by weight, comprises the following components:

[0069] Polypropylene: 66 parts;

[0070] KN resin: 30 parts;

[0071] Antioxidant: 0.5 parts;

[0072] UV protectant: 0.5 parts;

[0073] Elevast, a polyolefin modifier: 3 parts.

[0074] More preferably, the shielding layer of the present invention comprises, by weight, the following components: polypropylene: 39 parts;

[0075] KN resin: 20 parts;

[0076] Single-walled carbon nanotubes: 30 parts;

[0077] Antioxidant: 1 part;

[0078] Polyolefin modifier: 10 parts.

[0079] The insulating layer, by weight, comprises the following components:

[0080] Polypropylene: 66.5 parts;

[0081] KN resin: 30 parts;

[0082] Antioxidant: 0.5 parts;

[0083] Polyolefin modifier: 3 parts.

[0084] The protective layer, by weight, comprises the following components:

[0085] Polypropylene: 66 parts;

[0086] KN resin: 30 parts;

[0087] Antioxidant: 0.5 parts;

[0088] UV protectant: 0.5 parts;

[0089] Elevast, a polyolefin modifier: 3 parts.

[0090] The aforementioned polyolefin modifier Elevast can significantly reduce the glass transition temperature of polypropylene, improve the flexibility, impact resistance, and flowability of the polypropylene cable insulation material, and also improve the dispersibility of various additives in polypropylene.

[0091] The present invention also provides a method for preparing the above-mentioned polypropylene cable insulation material, characterized by comprising the following steps:

[0092] 1) The raw materials are melt-blended, extruded, and granulated to obtain resins for insulating layers, shielding layers, flame-retardant layers, and protective layers, respectively.

[0093] 2) The resin for the insulation layer, the resin for the shielding layer, the resin for the flame retardant layer, and the resin for the protective layer obtained in step 1) are extruded separately to obtain the insulation layer, the shielding layer, the flame retardant layer, and the protective layer. Then, they are stacked sequentially from the inside to the outside to prepare polypropylene cable insulation material.

[0094] Preferably, in step 1), the extrusion conditions for the resins used in the insulating layer, flame-retardant layer, and protective layer are as follows:

[0095] A twin-screw extruder was used for melt blending and extrusion.

[0096] The heating zone is as follows:

[0097] Zone 1: 120℃~130℃, Zone 2: 170℃~175℃, Zones 3-5: 180℃~185℃, Zones 6-8: 180℃~190℃, Die head: 165℃~170℃, Screw speed: 100~200rpm.

[0098] The preferred preparation conditions for the resin used in the shielding layer are:

[0099] First, the raw materials are melted and blended, and then extruded.

[0100] The melt blending is preferably carried out using an internal mixer.

[0101] The extrusion is preferably performed using a single-screw extruder. The melt blending temperature is 180℃~190℃, the speed is 100rpm, and the time is 15 minutes.

[0102] The heating zone of the extrusion is as follows:

[0103] Zones 1-3: 180℃~190℃, die head: 175℃~180℃, screw speed: 100~150rpm.

[0104] Preferably, the extrusion conditions for the insulating layer, shielding layer, flame-retardant layer, and protective layer in step 2) of this invention are as follows:

[0105] A twin-screw extruder was used for melt blending and extrusion.

[0106] The heating zone is as follows:

[0107] Insulation layer: Zone 1: 185℃~195℃, Zone 2: 185℃~200℃, Zone 3: 190℃~200℃, Zone 4: 195℃~200℃, Zone 5: 195℃~200℃; Main screw speed: 50℃~300rpm;

[0108] Shielding layer: Zone 1: 185℃~190℃, Zone 2: 185℃~195℃, Zone 3: 190℃~200℃, Zone 4: 195℃~205℃, Zone 5: 195~200℃; Main screw speed: 50~300rpm;

[0109] Flame retardant layer: Zone 1: 185℃~195℃, Inner Zone 2: 185℃~200℃, Inner Zone 3: 190℃~200℃, Inner Zone 4: 195℃~200℃, Inner Zone 5: 195℃~205℃; Main screw speed: 50~300rpm;

[0110] Protective layer: Zone 1: 185℃~190℃, Inner Zone 2: 190℃~200℃, Inner Zone 3: 190℃~200℃, Inner Zone 4: 195℃~200℃, Inner Zone 5: 190℃~200℃; Main screw speed: 50~300rpm.

[0111] The present invention also provides a cable containing the polypropylene cable insulation material described above or the polypropylene cable insulation material prepared by the above preparation method.

[0112] Compared with existing technologies, the polypropylene cable insulation material provided by this invention comprises, from the inside out, an insulation layer, a shielding layer, a flame-retardant layer, and a protective layer. The flame-retardant layer, by weight, comprises the following components: polypropylene: 49-61 parts, KN ​​resin: 20-25 parts, octabromosulfide: 10-15 parts, antioxidant: 1 part, and polyolefin modifier Elevast: 5 parts. The synergistic effect of polypropylene, KN resin, and octabromosulfide in the polypropylene cable insulation material enables it to possess both excellent flame-retardant and mechanical properties. This invention reveals that only by using octabromosulfide, or a octabromosulfide-antimony trioxide composite, as a flame retardant can the flame-retardant performance be improved without reducing the toughness of the polypropylene cable insulation material. Furthermore, adding single-walled carbon nanotubes to the shielding layer can improve the electromagnetic shielding performance of the polypropylene cable insulation material. The polypropylene cable insulation material of this invention possesses excellent flame-retardant, mechanical, and electromagnetic shielding properties, and has potential applications in fields such as anti-interference and stealth aircraft. Detailed Implementation

[0113] To further illustrate the present invention, the polypropylene cable insulation material and its preparation method provided by the present invention will be described in detail below with reference to embodiments.

[0114] The raw materials used in the embodiments and comparative examples of this invention are as follows:

[0115] Polypropylene, model NS06, Sino-Korean (Wuhan) Petrochemical Co., Ltd.

[0116] Toughening agent: KN resin, model KF360T, Japan Polyethylene Co., Ltd.;

[0117] Flame retardant: Octabromosulfide, Inner Mongolia Pulitai Materials Technology Co., Ltd.;

[0118] Flame retardant: Antimony trioxide, Sinopharm Chemical Reagent Co., Ltd.;

[0119] Conductive filler: Single-walled carbon nanotubes, Jiangsu Tiannai Technology Co., Ltd.;

[0120] Lubricant: Polyolefin modifier, model A80, ExxonMobil, USA;

[0121] Antioxidant: Model B215, manufactured by Shanghai Mohe New Materials Technology Co., Ltd.

[0122] UV protectant: Model number 1577, manufactured by Nanjing Hualiming Chemical Co., Ltd.

[0123] Ethylene propylene diene monomer (EPDM) rubber, model 3092PM, Shanghai Sinopec Mitsui Elastomers Co., Ltd.;

[0124] Conductive carbon black: Jiangxi Black Cat Carbon Black Co., Ltd.;

[0125] Halogen-free phosphorus flame retardant, model NP2200, Qingdao Ouprui New Materials Co., Ltd.

[0126] Example 1

[0127] 1) Polypropylene cable insulation layer

[0128] Polypropylene (NS06): 66.5 parts;

[0129] KN resin (KF360T): 30 parts;

[0130] Antioxidant (B215): 0.5 parts;

[0131] Polyolefin modifier (A80): 3 parts;

[0132] 2) Polypropylene cable shielding layer:

[0133] Polypropylene (NS06): 34 parts

[0134] KN resin (KF360T): 15 parts

[0135] Single-walled carbon nanotubes: 40 parts

[0136] Antioxidant (B215): 1 part

[0137] Polyolefin modifier (A80): 10 parts

[0138] 3) Flame-retardant layer of polypropylene cable:

[0139] Polypropylene (NS06): 54 parts;

[0140] KN resin (KF360T): 25 parts;

[0141] Octabromosulfide: 15 parts;

[0142] Antioxidant (B215): 1 part;

[0143] Polyolefin modifier Elevast (A80): 5 parts;

[0144] 4) Polypropylene cable protective layer:

[0145] Polypropylene (NS06): 66 parts;

[0146] KN resin (KF360T): 30 parts;

[0147] Antioxidant (B215): 0.5 parts;

[0148] UV protectant (1577): 0.5 parts;

[0149] Polyolefin modifier Elevast (A80): 3 parts;

[0150] According to the above proportions, polypropylene (NS06), KN resin (KF360T), antioxidant (B215), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain polypropylene resin for cable insulation. Extrusion granulation is performed using a twin-screw extruder with the following set temperatures: Zone 1: 120℃~130℃, Zone 2: 170℃~175℃, Zone 3: 180℃~185℃, Zone 4: 180℃~185℃, Zone 5: 180℃~185℃, Zone 6: 180℃~190℃, Zone 7: 180℃~190℃, Zone 8: 180℃~190℃, Die head: 165℃~170℃, Screw speed: 100-200 rpm.

[0151] According to the above proportions, polypropylene (NS06), KN resin (KF360T), single-walled carbon nanotubes, antioxidant (B215), and polyolefin modifier (A80) are added to a Banbury mixer for melt blending, and then extruded and granulated by a single screw extruder to obtain the resin for polypropylene cable shielding layer. The Banbury mixer is used for melt blending and then extruded and granulated by a single screw extruder. The set temperature of the Banbury mixer is 180℃~190℃, the speed is 100rpm, and the mixing time is 15 minutes. The set temperature of the single screw extruder is: Zone 1 and Zone 2: 180℃~190℃, Zone 3: 180℃~190℃, Die head: 175℃~180℃, and screw speed: 100-150rpm.

[0152] According to the above proportions, polypropylene (NS06), KN resin (KF360T), octabromosulfide, antioxidant (B215), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain a resin for the flame-retardant layer of polypropylene cables. Extrusion granulation is performed using a twin-screw extruder, with the following set temperatures: Zone 1: 120℃~130℃, Zone 2: 170℃~175℃, Zone 3: 180℃~185℃, Zone 4: 180℃~185℃, Zone 5: 180℃~185℃, Zone 6: 180℃~190℃, Zone 7: 180℃~190℃, Zone 8: 180℃~190℃, Die head: 165℃~170℃, Screw speed: 100-200 rpm.

[0153] According to the above proportions, polypropylene (NS06), KN resin (KF360T), antioxidant (B215), UV stabilizer (1577), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain polypropylene resin for cable protective layers. Extrusion granulation is performed using a twin-screw extruder with the following set temperatures: Zone 1: 120℃~130℃, Zone 2: 170℃~175℃, Zone 3: 180℃~185℃, Zone 4: 180℃~185℃, Zone 5: 180℃~185℃, Zone 6: 180℃~190℃, Zone 7: 180℃~190℃, Zone 8: 180℃~190℃, Die head: 165℃~170℃, Screw speed: 100-200 rpm.

[0154] The polypropylene cable insulation resin, polypropylene cable shielding resin, polypropylene flame-retardant cable resin, and polypropylene cable protective layer resin prepared above are respectively added to a four-layer co-extrusion extruder. The insulation resin, shielding resin, flame-retardant resin, and protective layer resin are sequentially coated onto the conductor surface through the four-layer co-extrusion extruder to obtain a polypropylene cable insulation material having an insulation layer, shielding layer, flame-retardant layer, and protective layer sequentially from the inside out.

[0155] Polypropylene cable material is processed using a four-layer co-extrusion extruder, and the set temperature of the four-layer co-extrusion extruder is:

[0156] The first layer (insulating layer) outside the conductor

[0157] Zone 1: 185℃~195℃, Zone 2: 185℃~200℃, Zone 3: 190℃~200℃, Zone 4: 195℃~200℃, Zone 5: 195℃~200℃; Main screw speed: 50~300rpm;

[0158] The second layer outside the conductor (shielding layer)

[0159] Zone 1: 185℃~190℃, Zone 2: 185℃~195℃, Zone 3: 190℃~200℃, Zone 4: 195℃~205℃, Zone 5: 195℃~200℃; Main screw speed: 50~300rpm;

[0160] The third layer outside the conductor (flame retardant layer)

[0161] Zone 1: 185℃~195℃, Zone 2: 185℃~200℃, Zone 3: 190℃~200℃, Zone 4: 195℃~200℃, Zone 5: 195℃~205℃; Main screw speed: 50~300rpm;

[0162] The fourth layer (protective layer) outside the conductor

[0163] Zone 1: 185℃~190℃, Zone 2: 190℃~200℃, Zone 3: 190℃~200℃, Zone 4: 195℃~200℃, Zone 5: 190℃~200℃; Main screw speed: 50~300rpm.

[0164] Example 2

[0165] 1) Polypropylene cable insulation layer:

[0166] Polypropylene (NS06): 66.5 parts;

[0167] KN resin (KF360T): 30 parts;

[0168] Antioxidant (B215): 0.5 parts;

[0169] Polyolefin modifier (A80): 3 parts;

[0170] 2) Polypropylene cable shielding layer:

[0171] Polypropylene (NS06): 39 parts

[0172] KN resin (KF360T): 20 parts

[0173] Single-walled carbon nanotubes: 30 parts

[0174] Antioxidant (B215): 1 part

[0175] Polyolefin modifier (A80): 10 parts

[0176] 3) Flame-retardant layer of polypropylene cable:

[0177] Polypropylene (NS06): 54 parts;

[0178] KN resin (KF360T): 25 parts;

[0179] Octabromosulfide: 15 parts;

[0180] Antioxidant (B215): 1 part;

[0181] Polyolefin modifier Elevast (A80): 5 parts;

[0182] 4) Polypropylene cable protective layer:

[0183] Polypropylene (NS06): 66 parts;

[0184] KN resin (KF360T): 30 parts;

[0185] Antioxidant (B215): 0.5 parts;

[0186] UV protectant (1577): 0.5 parts;

[0187] Polyolefin modifier Elevast (A80): 3 parts;

[0188] According to the above proportions, polypropylene (NS06), KN resin (KF360T), antioxidant (B215), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain polypropylene resin for cable insulation. Extrusion granulation is performed using a twin-screw extruder with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0189] According to the above proportions, polypropylene (NS06), KN resin (KF360T), single-walled carbon nanotubes, antioxidant (B215), and polyolefin modifier (A80) are added to a Banbury mixer for melt blending, and then extruded and granulated by a single screw extruder to obtain the resin for polypropylene cable shielding layer. The Banbury mixer is used for melt blending and then extruded and granulated by a single screw extruder. The set temperature of the Banbury mixer is 180℃~190℃, the speed is 100rpm, and the mixing time is 15 minutes. The set temperature of the single screw extruder is: Zone 1: Zone 2: 180~190℃, Zone 3: 180~190℃, Die head: 175~180℃, Screw speed: 100-150rpm.

[0190] According to the above proportions, polypropylene (NS06), KN resin (KF360T), octabromosulfide, antioxidant (B215), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain a resin for the flame-retardant layer of polypropylene cables. Extrusion granulation is performed using a twin-screw extruder, with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0191] According to the above proportions, polypropylene (NS06), KN resin (KF360T), antioxidant (B215), UV stabilizer (1577), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain polypropylene resin for cable protective layers. Extrusion granulation is performed using a twin-screw extruder with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0192] Resin for polypropylene cable insulation, resin for polypropylene cable shielding, resin for polypropylene flame-retardant cable, and resin for polypropylene cable protection are added to a four-layer co-extrusion extruder. The four-layer co-extrusion extruder sequentially coats the conductor surface with resin for insulation, resin for shielding, resin for flame retardant, and resin for protection, resulting in a polypropylene cable insulation material having an insulation layer, a shielding layer, a flame-retardant layer, and a protection layer from the inside out.

[0193] Polypropylene cable material is processed using a four-layer co-extrusion extruder, and the set temperature of the four-layer co-extrusion extruder is:

[0194] The first layer (insulating layer) outside the conductor

[0195] Zone 1: 185~195℃, Zone 2: 185~200℃, Zone 3: 190~200℃, Zone 4: 195~200℃, Zone 5: 195~200℃; Main screw speed: 50~300rpm;

[0196] The second layer outside the conductor (shielding layer)

[0197] Zone 1: 185~190℃, Zone 2: 185~195℃, Zone 3: 190~200℃, Zone 4: 195~205℃, Zone 5: 195~200℃; Main screw speed: 50~300rpm;

[0198] The third layer outside the conductor (flame retardant layer)

[0199] Zone 1: 185~195℃, Zone 2: 185~200℃, Zone 3: 190~200℃, Zone 4: 195~200℃, Zone 5: 195~205℃; Main screw speed: 50~300rpm;

[0200] The fourth layer (protective layer) outside the conductor

[0201] Zone 1: 185~190℃, Zone 2: 190~200℃, Zone 3: 190~200℃, Zone 4: 195~200℃, Zone 5: 190~200℃; Main screw speed: 50~300rpm.

[0202] Example 3

[0203] 1) Polypropylene cable insulation layer:

[0204] Polypropylene (NS06): 66.5 parts;

[0205] KN resin (KF360T): 30 parts;

[0206] Antioxidant (B215): 0.5 parts;

[0207] Polyolefin modifier (A80): 3 parts;

[0208] 2) Polypropylene cable shielding layer:

[0209] Polypropylene (NS06): 34 parts

[0210] KN resin (KF360T): 15 parts

[0211] Single-walled carbon nanotubes: 40 parts

[0212] Antioxidant (B215): 1 part

[0213] Polyolefin modifier (A80): 10 parts

[0214] 3) Flame-retardant layer of polypropylene cable:

[0215] Polypropylene (NS06): 54 parts;

[0216] KN resin (KF360T): 25 parts;

[0217] Octabromosulfide: 10 parts;

[0218] Antimony trioxide: 5 parts;

[0219] Antioxidant (B215): 1 part;

[0220] Polyolefin modifier Elevast (A80): 5 parts;

[0221] 4) Polypropylene cable protective layer:

[0222] Polypropylene (NS06): 66 parts;

[0223] KN resin (KF360T): 30 parts;

[0224] Antioxidant (B215): 0.5 parts;

[0225] UV protectant (1577): 0.5 parts;

[0226] Polyolefin modifier Elevast (A80): 3 parts;

[0227] According to the above proportions, polypropylene (NS06), KN resin (KF360T), antioxidant (B215), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain polypropylene resin for cable insulation. Extrusion granulation is performed using a twin-screw extruder with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0228] According to the above proportions, polypropylene (NS06), KN resin (KF360T), single-walled carbon nanotubes, antioxidant (B215), and polyolefin modifier (A80) are added to a Banbury mixer for melt blending, and then extruded and granulated by a single screw extruder to obtain the resin for polypropylene cable shielding layer. The Banbury mixer is used for melt blending and then extruded and granulated by a single screw extruder. The set temperature of the Banbury mixer is 180℃~190℃, the speed is 100rpm, and the mixing time is 15 minutes. The set temperature of the single screw extruder is: Zone 1: Zone 2: 180~190℃, Zone 3: 180~190℃, Die head: 175~180℃, Screw speed: 100-150rpm.

[0229] According to the above proportions, polypropylene (NS06), KN resin (KF360T), octabromosulfide, antioxidant (B215), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain a resin for the flame-retardant layer of polypropylene cables. Extrusion granulation is performed using a twin-screw extruder, with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0230] According to the above proportions, polypropylene (NS06), KN resin (KF360T), antioxidant (B215), UV stabilizer (1577), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain polypropylene resin for cable protective layers. Extrusion granulation is performed using a twin-screw extruder with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0231] Resin for polypropylene cable insulation, resin for polypropylene cable shielding, resin for polypropylene flame-retardant cable, and resin for polypropylene cable protection are added to a four-layer co-extrusion extruder. The four-layer co-extrusion extruder sequentially coats the conductor surface with resin for insulation, resin for shielding, resin for flame retardant, and resin for protection, resulting in a polypropylene cable insulation material having an insulation layer, a shielding layer, a flame-retardant layer, and a protection layer from the inside out.

[0232] Polypropylene cable material is processed using a four-layer co-extrusion extruder, and the set temperature of the four-layer co-extrusion extruder is:

[0233] The first outer layer (insulation layer) of the conductor: Zone 1: 185~195℃, Zone 2: 185~200℃, Zone 3: 190~200℃, Zone 4: 195~200℃, Zone 5: 195~200℃; Main screw speed: 50~300rpm; The second outer layer (shielding layer) of the conductor: Zone 1: 185~190℃, Zone 2: 185~195℃, Zone 3: 190~200℃, Zone 4: 195~205℃, Zone 5: 195~200℃; Main screw speed: 50~300rpm; The second outer layer (shielding layer) of the conductor: Zone 1: 185~190℃, Zone 2: 185~195℃, Zone 3: 190~200℃, Zone 4: 195~205℃, Zone 5: 195~200℃; Main screw speed: 50~300rpm; The third outer layer (shielding layer) of the conductor: Three-layer (flame retardant layer): Zone 1: 185~195℃, Inner Zone 2: 185~200℃, Inner Zone 3: 190~200℃, Inner Zone 4: 195~200℃, Inner Zone 5: 195~205℃; Main screw speed: 50~300rpm; Outer conductor fourth layer (protective layer): Zone 1: 185~190℃, Inner Zone 2: 190~200℃, Inner Zone 3: 190~200℃, Inner Zone 4: 195~200℃, Inner Zone 5: 190~200℃; Main screw speed: 50~300rpm.

[0234] Comparative Example 1

[0235] 1) Polypropylene cable insulation layer:

[0236] Polypropylene (NS06): 66.5 parts;

[0237] EPDM (3092PM): 30 copies;

[0238] Antioxidant (B215): 0.5 parts;

[0239] Polyolefin modifier (A80): 3 parts;

[0240] 2) Polypropylene cable shielding layer:

[0241] Polypropylene (NS06): 34 parts

[0242] EPDM (3092PM): 15 copies

[0243] Single-walled carbon nanotubes: 40 parts

[0244] Antioxidant (B215): 1 part

[0245] Polyolefin modifier (A80): 10 parts

[0246] 3) Flame-retardant layer of polypropylene cable:

[0247] Polypropylene (NS06): 54 parts;

[0248] EPDM (3092PM): 25 copies;

[0249] Octabromosulfide: 15 parts;

[0250] Antioxidant (B215): 1 part;

[0251] Polyolefin modifier Elevast (A80): 5 parts;

[0252] 4) Polypropylene cable protective layer:

[0253] Polypropylene (NS06): 66 parts;

[0254] EPDM (3092PM): 30 copies;

[0255] Antioxidant (B215): 0.5 parts;

[0256] UV protectant (1577): 0.5 parts;

[0257] Polyolefin modifier Elevast (A80): 3 parts;

[0258] According to the above proportions, polypropylene (NS06), EPDM (3092PM), antioxidant (B215), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain polypropylene resin for cable insulation. Extrusion granulation is performed using a twin-screw extruder with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0259] According to the above proportions, polypropylene (NS06), EPDM (3092PM), single-walled carbon nanotubes, antioxidant (B215), and polyolefin modifier (A80) are added to a Banbury mixer for melt blending, and then extruded and granulated by a single screw extruder to obtain the resin for polypropylene cable shielding layer. The Banbury mixer is used for melt blending and then extruded and granulated by a single screw extruder. The set temperature of the Banbury mixer is 180℃~190℃, the speed is 100rpm, and the mixing time is 15 minutes. The set temperature of the single screw extruder is: Zone 1: Zone 2: 180~190℃, Zone 3: 180~190℃, Die head: 175~180℃, Screw speed: 100-150rpm.

[0260] According to the above proportions, polypropylene (NS06), EPDM (3092PM), octabromosulfide, antioxidant (B215), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain a resin for the flame-retardant layer of polypropylene cables. Extrusion granulation is performed using a twin-screw extruder with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0261] According to the above proportions, polypropylene (NS06), EPDM (3092PM), antioxidant (B215), UV stabilizer (1577), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain polypropylene resin for cable protective layers. Extrusion granulation is performed using a twin-screw extruder with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0262] Resin for polypropylene cable insulation, resin for polypropylene cable shielding, resin for polypropylene flame-retardant cable, and resin for polypropylene cable protection are added to a four-layer co-extrusion extruder. The four-layer co-extrusion extruder sequentially coats the conductor surface with resin for insulation, resin for shielding, resin for flame retardant, and resin for protection, resulting in a polypropylene cable insulation material having an insulation layer, a shielding layer, a flame-retardant layer, and a protection layer from the inside out.

[0263] Polypropylene cable material is processed using a four-layer co-extrusion extruder, and the set temperature of the four-layer co-extrusion extruder is:

[0264] The first layer (insulating layer) outside the conductor

[0265] Zone 1: 185~195℃, Zone 2: 185~200℃, Zone 3: 190~200℃, Zone 4: 195~200℃, Zone 5: 195~200℃; Main screw speed: 50~300rpm;

[0266] The second layer outside the conductor (shielding layer)

[0267] Zone 1: 185~190℃, Zone 2: 185~195℃, Zone 3: 190~200℃, Zone 4: 195~205℃, Zone 5: 195~200℃; Main screw speed: 50~300rpm;

[0268] The third layer outside the conductor (flame retardant layer)

[0269] Zone 1: 185~195℃, Zone 2: 185~200℃, Zone 3: 190~200℃, Zone 4: 195~200℃, Zone 5: 195~205℃; Main screw speed: 50~300rpm;

[0270] The fourth layer (protective layer) outside the conductor

[0271] Zone 1: 185~190℃, Zone 2: 190~200℃, Zone 3: 190~200℃, Zone 4: 195~200℃, Zone 5: 190~200℃; Main screw speed: 50~300rpm.

[0272] Comparative Example 2

[0273] 1) Polypropylene cable insulation layer:

[0274] Polypropylene (NS06): 66.5 parts;

[0275] KN resin (KF360T): 30 parts;

[0276] Antioxidant (B215): 0.5 parts;

[0277] Polyolefin modifier (A80): 3 parts;

[0278] 2) Polypropylene cable shielding layer:

[0279] Polypropylene (NS06): 34 parts

[0280] KN resin (KF360T): 15 parts

[0281] Conductive carbon black: 40 parts

[0282] Antioxidant (B215): 1 part

[0283] Polyolefin modifier (A80): 10 parts

[0284] 3) Flame-retardant layer of polypropylene cable:

[0285] Polypropylene (NS06): 54 parts;

[0286] KN resin (KF360T): 25 parts;

[0287] Octabromosulfide: 15 parts;

[0288] Antioxidant (B215): 1 part;

[0289] Polyolefin modifier Elevast (A80): 5 parts;

[0290] 4) Polypropylene cable protective layer:

[0291] Polypropylene (NS06): 66 parts;

[0292] KN resin (KF360T): 30 parts;

[0293] Antioxidant (B215): 0.5 parts;

[0294] UV protectant (1577): 0.5 parts;

[0295] Polyolefin modifier Elevast (A80): 3 parts.

[0296] According to the above proportions, polypropylene (NS06), KN resin (KF360T), antioxidant (B215), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain polypropylene resin for cable insulation. Extrusion granulation is performed using a twin-screw extruder with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0297] According to the above proportions, polypropylene (NS06), KN resin (KF360T), conductive carbon black, antioxidant (B215), and polyolefin modifier (A80) are added to a Banbury mixer for melt blending, and then extruded and granulated by a single screw extruder to obtain the resin for polypropylene cable shielding layer. The Banbury mixer is used for melt blending and then extruded and granulated by a single screw extruder. The set temperature of the Banbury mixer is 180℃~190℃, the speed is 100rpm, and the mixing time is 15 minutes. The set temperature of the single screw extruder is: Zone 1: Zone 2: 180~190℃, Zone 3: 180~190℃, Die head: 175~180℃, Screw speed: 100-150rpm.

[0298] According to the above proportions, polypropylene (NS06), KN resin (KF360T), octabromosulfide, antioxidant (B215), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain a resin for the flame-retardant layer of polypropylene cables. Extrusion granulation is performed using a twin-screw extruder, with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0299] According to the above proportions, polypropylene (NS06), KN resin (KF360T), antioxidant (B215), UV stabilizer (1577), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain polypropylene resin for cable protective layers. Extrusion granulation is performed using a twin-screw extruder with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0300] Resin for polypropylene cable insulation, resin for polypropylene cable shielding, resin for polypropylene flame-retardant cable, and resin for polypropylene cable protection are added to a four-layer co-extrusion extruder. The four-layer co-extrusion extruder sequentially coats the conductor surface with resin for insulation, resin for shielding, resin for flame retardant, and resin for protection, resulting in a polypropylene cable insulation material having an insulation layer, a shielding layer, a flame-retardant layer, and a protection layer from the inside out.

[0301] Polypropylene cable material is processed using a four-layer co-extrusion extruder, and the set temperature of the four-layer co-extrusion extruder is:

[0302] The first layer (insulating layer) outside the conductor

[0303] Zone 1: 185~195℃, Zone 2: 185~200℃, Zone 3: 190~200℃, Zone 4: 195~200℃, Zone 5: 195~200℃; Main screw speed: 50~300rpm;

[0304] The second layer outside the conductor (shielding layer)

[0305] Zone 1: 185~190℃, Zone 2: 185~195℃, Zone 3: 190~200℃, Zone 4: 195~205℃, Zone 5: 195~200℃; Main screw speed: 50~300rpm;

[0306] The third layer outside the conductor (flame retardant layer)

[0307] Zone 1: 185~195℃, Zone 2: 185~200℃, Zone 3: 190~200℃, Zone 4: 195~200℃, Zone 5: 195~205℃; Main screw speed: 50~300rpm;

[0308] The fourth layer (protective layer) outside the conductor

[0309] Zone 1: 185~190℃, Zone 2: 190~200℃, Zone 3: 190~200℃, Zone 4: 195~200℃, Zone 5: 190~200℃; Main screw speed: 50~300rpm.

[0310] Comparative Example 3

[0311] 1) Polypropylene cable insulation layer:

[0312] Polypropylene (NS06): 66.5 parts;

[0313] KN resin (KF360T): 30 parts;

[0314] Antioxidant (B215): 0.5 parts;

[0315] Polyolefin modifier (A80): 3 parts;

[0316] 2) Polypropylene cable shielding layer:

[0317] Polypropylene (NS06): 34 parts

[0318] KN resin (KF360T): 15 parts

[0319] Single-walled carbon nanotubes: 40 parts

[0320] Antioxidant (B215): 1 part

[0321] Polyolefin modifier (A80): 10 parts

[0322] 3) Flame-retardant layer of polypropylene cable:

[0323] Polypropylene (NS06): 54 parts;

[0324] KN resin (KF360T): 25 parts;

[0325] Halogen-free flame retardant (NP2200): 15 parts;

[0326] Antioxidant (B215): 1 part;

[0327] Polyolefin modifier Elevast (A80): 5 parts;

[0328] 4) Polypropylene cable protective layer:

[0329] Polypropylene (NS06): 66 parts;

[0330] KN resin (KF360T): 30 parts;

[0331] Antioxidant (B215): 0.5 parts;

[0332] UV protectant (1577): 0.5 parts;

[0333] Polyolefin modifier Elevast (A80): 3 parts;

[0334] According to the above proportions, polypropylene (NS06), KN resin (KF360T), antioxidant (B215), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain polypropylene resin for cable insulation. Extrusion granulation is performed using a twin-screw extruder with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0335] According to the above proportions, polypropylene (NS06), KN resin (KF360T), conductive carbon black, antioxidant (B215), and polyolefin modifier (A80) are added to a Banbury mixer for melt blending, and then extruded and granulated by a single screw extruder to obtain the resin for polypropylene cable shielding layer. The Banbury mixer is used for melt blending and then extruded and granulated by a single screw extruder. The set temperature of the Banbury mixer is 180℃~190℃, the speed is 100rpm, and the mixing time is 15 minutes. The set temperature of the single screw extruder is: Zone 1: Zone 2: 180~190℃, Zone 3: 180~190℃, Die head: 175~180℃, Screw speed: 100-150rpm.

[0336] According to the above proportions, polypropylene (NS06), KN resin (KF360T), halogen-free flame retardant (NP2200), antioxidant (B215), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain a resin for the flame-retardant layer of polypropylene cables. Extrusion granulation is performed using a twin-screw extruder, with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0337] According to the above proportions, polypropylene (NS06), KN resin (KF360T), antioxidant (B215), UV stabilizer (1577), and polyolefin modifier (A80) are added to a twin-screw extruder for melt blending, extrusion, and granulation to obtain polypropylene resin for cable protective layers. Extrusion granulation is performed using a twin-screw extruder with the following set temperatures: Zone 1: 120–130℃, Zone 2: 170–175℃, Zone 3: 180–185℃, Zone 4: 180–185℃, Zone 5: 180–185℃, Zone 6: 180–190℃, Zone 7: 180–190℃, Zone 8: 180–190℃, Die head: 165–170℃, Screw speed: 100–200 rpm.

[0338] Resin for polypropylene cable insulation, resin for polypropylene cable shielding, resin for polypropylene flame-retardant cable, and resin for polypropylene cable protection are added to a four-layer co-extrusion extruder. The four-layer co-extrusion extruder sequentially coats the conductor surface with resin for insulation, resin for shielding, resin for flame retardant, and resin for protection, resulting in a polypropylene cable insulation material having an insulation layer, a shielding layer, a flame-retardant layer, and a protection layer from the inside out.

[0339] Polypropylene cable material is processed using a four-layer co-extrusion extruder, and the set temperature of the four-layer co-extrusion extruder is:

[0340] The first layer (insulating layer) outside the conductor

[0341] Zone 1: 185~195℃, Zone 2: 185~200℃, Zone 3: 190~200℃, Zone 4: 195~200℃, Zone 5: 195~200℃; Main screw speed: 50~300rpm;

[0342] The second layer outside the conductor (shielding layer)

[0343] Zone 1: 185~190℃, Zone 2: 185~195℃, Zone 3: 190~200℃, Zone 4: 195~205℃, Zone 5: 195~200℃; Main screw speed: 50~300rpm;

[0344] The third layer outside the conductor (flame retardant layer)

[0345] Zone 1: 185~195℃, Zone 2: 185~200℃, Zone 3: 190~200℃, Zone 4: 195~200℃, Zone 5: 195~205℃; Main screw speed: 50~300rpm;

[0346] The fourth layer (protective layer) outside the conductor

[0347] Zone 1: 185~190℃, Zone 2: 190~200℃, Zone 3: 190~200℃, Zone 4: 195~200℃, Zone 5: 190~200℃; Main screw speed: 50~300rpm.

[0348] Table 1 Test performance data of polypropylene cable insulation material

[0349]

[0350]

[0351] In summary, the polypropylene cable insulation material described in this invention possesses excellent flame retardant properties, electromagnetic shielding properties, and mechanical properties.

[0352] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A polypropylene cable insulation material, characterized in that, From the inside out, it includes an insulation layer, a shielding layer, a flame-retardant layer, and a protective layer. The flame-retardant layer comprises, by weight, the following components: Polypropylene: 49-61 parts; KN resin: 20-25 parts; Octabromosulfide: 10-15 parts; Antioxidant: 1-3 parts; Elevast, a polyolefin modifier: 3-5 parts; The shielding layer, by weight, comprises the following components: Polypropylene: 29-44 parts; KN resin: 15-20 parts; Single-walled carbon nanotubes: 30-40 parts; Antioxidant: 1-3 parts; Elevast, a polyolefin modifier: 5-10 parts; The insulating layer, by weight, comprises the following components: Polypropylene: 66.5 ~ 76.5 parts; KN resin: 20-30 parts; Antioxidant: 0.5 ~ 3 parts; Elevast, a polyolefin modifier: 3-5 parts; The protective layer, by weight, comprises the following components: Polypropylene: 66-76 parts; KN resin: 20-30 parts; Antioxidant: 0.5 ~ 3 parts; UV protectant: 0.5 ~ 3 parts; Elevast, a polyolefin modifier: 3 to 5 parts.

2. The polypropylene cable insulation material according to claim 1, characterized in that, The flame-retardant layer also includes the following components: Antimony trioxide: 3 to 5 parts.

3. The polypropylene cable insulation material according to claim 1, characterized in that, The flame-retardant layer comprises, by weight, the following components: Polypropylene: 50-55 parts; KN resin: 22-25 parts; Octabromosulfide: 10-15 parts; Antioxidant: 1-3 parts; Elevast, a polyolefin modifier: 3 to 5 parts.

4. The polypropylene cable insulation material according to claim 1, characterized in that, The flame-retardant layer comprises, by weight, the following components: Polypropylene: 54 parts; KN resin: 25 parts; Octabromosulfide: 15 parts; Antioxidant: 1 part; Elevast, a polyolefin modifier: 5 parts.

5. The polypropylene cable insulation material according to claim 2, characterized in that, The flame-retardant layer comprises, by weight, the following components: Polypropylene: 54 parts; KN resin: 25 parts; Octabromosulfide: 10 parts; Antimony trioxide: 5 parts; Antioxidant: 1 part; Elevast, a polyolefin modifier: 5 parts.

6. The polypropylene cable insulation material according to claim 1, characterized in that, The shielding layer, by weight, comprises the following components: Polypropylene: 34 parts; KN resin: 15 parts; Single-walled carbon nanotubes: 40 parts; Antioxidant: 1 part; Elevast, a polyolefin modifier: 10 parts; The insulating layer, by weight, comprises the following components: Polypropylene: 66.5 parts; KN resin: 30 parts; Antioxidant: 0.5 parts; Elevast, a polyolefin modifier: 3 parts; The protective layer, by weight, comprises the following components: Polypropylene: 66 parts; KN resin: 30 parts; Antioxidant: 0.5 parts; UV protectant: 0.5 parts; Elevast, a polyolefin modifier: 3 parts.

7. The method for preparing the polypropylene cable insulation material according to any one of claims 1 to 6, characterized in that, Includes the following steps: 1) The raw materials are melt-blended, extruded, and granulated to obtain resins for insulating layers, shielding layers, flame-retardant layers, and protective layers, respectively. 2) The resin for the insulation layer, the resin for the shielding layer, the resin for the flame retardant layer, and the resin for the protective layer obtained in step 1) are extruded separately to obtain the insulation layer, the shielding layer, the flame retardant layer, and the protective layer. Then, they are stacked sequentially from the inside to the outside to prepare the polypropylene cable insulation material.

8. A cable, characterized in that, The polypropylene cable insulation material comprising any one of claims 1 to 6 or the polypropylene cable insulation material prepared by the preparation method of claim 7.

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