Preparation method of optical cable sheath material and optical cable sheath material

Abstract

The embodiment of the invention provides a preparation method of an optical cable sheath material and the optical cable sheath material, and belongs to the technical field of optical cable preparation. The preparation method of the optical cable sheath material comprises the following steps: mixing a first base material according to a first preset proportion, wherein the first base material comprises ultra-high molecular weight polyethylene, high-density polyethylene and a compound lubricant; extruding and granulating the mixed first base material to obtain a master batch material; and mixing the master batch material and a second base material according to a second preset proportion, and performing extrusion granulation to obtain the optical cable sheath material, wherein the second base material comprises high-density polyethylene, linear low-density polyethylene and a processing aid. According to the preparation method of the optical cable sheath material provided by the embodiment of the invention, the ultra-high molecular weight polyethylene is uniformly dispersed in the system through secondary processing of master batch, the self-lubricating property and the wear resistance are enhanced, and the surface quality of the sheath material is improved.

Description

Technical Field

[0001] The present application relates to optical cable technology, and in particular to a preparation method of an optical cable sheath material and an optical cable sheath material. Background Art

[0002] Air-blown optical cables use air power to propel optical fibers along the route within the pipe, effectively improving the flexibility and convenience of optical fiber wiring.

[0003] In related technologies, air-blown optical cables are relatively light in weight, and generally require only a small amount of air blowing force to complete installation. Therefore, small-diameter air-blown optical cables do not require a high friction coefficient for the sheath material. However, with the continuous development of the communications industry, the demand for large-diameter air-blown optical cables is increasing. Due to the large weight and strong rigidity of large-diameter air-blown optical cables, the friction force of large-diameter air-blown optical cables during pipeline installation is much greater than that of small-diameter air-blown optical cables. This makes the assembly of large-diameter air-blown optical cables difficult due to the high friction, affecting assembly efficiency. Summary of the Invention

[0004] The present application provides a preparation method of an optical cable sheath material and an optical cable sheath material, which are used to solve the technical problem in the related art that the friction of the optical cable sheath material is large, resulting in difficulty in assembly.

[0005] In one aspect, the present application provides a method for preparing an optical cable sheath material, comprising the following steps:

[0006] Mixing a first base material according to a first preset ratio, wherein the first base material includes ultra-high molecular weight polyethylene, high-density polyethylene and a compound lubricant;

[0007] Extruding and granulating the mixed first substrate material to obtain a masterbatch material;

[0008] mixing the masterbatch material with a second substrate material according to a second preset ratio, wherein the second substrate material comprises high-density polyethylene, linear low-density polyethylene and a processing aid;

[0009] Extruding and granulating the mixed masterbatch material and the second base material to obtain an optical cable sheath material;

[0010] The step of extruding and granulating the mixed first substrate material to obtain a masterbatch material comprises:

[0011] Putting the mixed first substrate material into an internal mixer for internal mixing to obtain internal mixed pre-masterbatch material;

[0012] The pre-masterbatch material is fed into a single-screw extruder for shearing, extrusion and granulation to obtain the masterbatch material.

[0013] In some possible implementations, the step of extruding and granulating the mixed masterbatch material and the second base material to obtain the optical cable sheathing material comprises:

[0014] The mixed masterbatch material and the second base material are fed into a twin-screw extruder for shearing, extrusion and granulation to obtain an optical cable sheath material.

[0015] In some possible embodiments, the compound lubricant includes an external lubricant and an auxiliary lubricant, the external lubricant is incompatible with polyethylene, and at least a portion of the auxiliary lubricant is compatible with the polyethylene;

[0016] The first preset weight ratio of the first substrate material is:

[0017] 30-70 parts of high-density polyethylene;

[0018] Ultra-high molecular weight polyethylene 0-40 parts;

[0019] 0-16 parts of external lubricant;

[0020] Auxiliary lubricant 0-2 parts;

[0021] Antioxidant 0.1-0.4 parts.

[0022] In some possible implementations, the external lubricant includes polysiloxane and a fluoropolymer auxiliary, and the auxiliary lubricant includes a long-chain fatty acid amide;

[0023] The first preset weight ratio of the first substrate material is:

[0024] 30-70 parts of high-density polyethylene;

[0025] Ultra-high molecular weight polyethylene 0-40 parts;

[0026] Silicone 0-15 parts;

[0027] Fluoropolymer additive 0-1 part;

[0028] 0-2 parts of long-chain fatty acid amide;

[0029] Antioxidant 0.1-0.4 parts.

[0030] In some possible implementations, the external lubricant includes silicone and fluororubber, and the auxiliary lubricant includes at least one of erucamide and oleamide.

[0031] In some possible implementations, the processing aid includes carbon black masterbatch, and the second preset weight ratio of the masterbatch material to the second substrate material is:

[0032] 50-70 parts of linear low-density polyethylene;

[0033] High-density polyethylene 0-15 parts;

[0034] 15-25 parts of masterbatch material;

[0035] 3-6 parts of carbon black masterbatch;

[0036] Antioxidant 0.1-0.4 parts.

[0037] In some possible implementations, the carbon black masterbatch is a polyethylene-based masterbatch with a carbon black content of 45%-50%.

[0038] In some possible implementations, the antioxidant includes hindered phenol antioxidants and phosphite antioxidants.

[0039] In some possible implementations, the mixed first substrate material is placed in an internal mixer for internal mixing. The internal mixing temperature of the internal mixer is 160° C.-190° C., and the internal mixing time is 10 minutes.

[0040] On the other hand, the present application provides an optical cable sheath material, which is prepared by the preparation method of the optical cable sheath material as described in any one of the above items.

[0041] The present application provides a preparation method for an optical cable sheathing material and an optical cable sheathing material. In the preparation method, a first base material is first mixed, extruded and granulated according to a first preset ratio to obtain a masterbatch material, and ultra-high molecular weight polyethylene is pre-dispersed under the effect of a compounded lubricant. The masterbatch material obtained by granulation is then mixed with a second base material according to a second preset ratio, and extruded and granulated to obtain a finished optical cable sheathing material. Thus, through the secondary processing of masterbatch, the ultra-high molecular weight polyethylene is uniformly dispersed in the optical cable sheathing material system, and the good self-lubricating properties and wear resistance of the ultra-high molecular weight polyethylene itself are utilized to improve the surface quality of the finished optical cable sheathing material, thereby facilitating the subsequent assembly of air-blown optical cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0043] Figure 1 Schematic diagram of the steps of the preparation method of the optical cable sheath material in the embodiment of the present application;

[0044] Figure 2 This is a flow chart of the preparation method of the optical cable sheath material in the embodiment of this application.

[0045] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0048] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0049] The terms "first," "second," "third," "fourth," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the application described herein can, for example, be implemented in an order other than that illustrated or described herein.

[0050] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0051] Low-friction optical cable sheath material is mainly used for the outer sheath of air-blown optical cable. Air-blown optical cable is a special optical cable that is quickly laid in a pipeline by blowing gas. It has the characteristics of fast installation and little damage. It is widely used in application scenarios such as urban construction and rail transit where large-scale construction is not convenient.

[0052] In the existing technical solutions, the optical cable sheath material mainly uses polyethylene resin as the main material. Large-diameter air-blown optical cables are heavy and rigid. During pipeline installation, the friction force is much greater than that of air-blown micro cables. The existing low-friction sheath material cannot meet its usage requirements.

[0053] Based on the above related technical description, one or more embodiments of the present application provide a method for preparing an optical cable sheathing material and an optical cable sheathing material. In the preparation method, a first base material is first mixed, extruded and granulated according to a first preset ratio to obtain a masterbatch material, so that ultra-high molecular weight polyethylene is pre-dispersed under the effect of a compound lubricant, and then the masterbatch material obtained by granulation is mixed with a second base material according to a second preset ratio, and extruded and granulated to obtain a finished optical cable sheathing material. Thus, through the secondary processing of masterbatch, the ultra-high molecular weight polyethylene is uniformly dispersed in the optical cable sheathing material system, and the good self-lubricating properties and wear resistance of the ultra-high molecular weight polyethylene itself are utilized to improve the surface quality of the finished optical cable sheathing material.

[0054] The technical solutions of the embodiments of the present application are described below with reference to the accompanying drawings.

[0055] like Figure 1 As shown, the method for preparing the optical cable sheath material provided in the embodiment of the present application includes the following steps:

[0056] Step 100: mixing a first substrate material according to a first preset ratio, wherein the first substrate material includes ultra-high molecular weight polyethylene, high-density polyethylene, and a compound lubricant;

[0057] Step 200, extruding and granulating the mixed first substrate material to obtain a masterbatch material;

[0058] Step 300: mixing a masterbatch material with a second substrate material according to a second preset ratio, wherein the second substrate material includes high-density polyethylene, linear low-density polyethylene, and a processing aid;

[0059] Step 400: Extruding and granulating the mixed masterbatch material and the second base material to obtain an optical cable sheath material.

[0060] It can be seen from the above description that the preparation method of the optical cable sheath material provided in the embodiment of the present application utilizes a multi-stage blending and secondary masterbatch process. The ultra-high molecular weight polyethylene is first pre-dispersed under the action of a compound lubricant to obtain a masterbatch material, and then the masterbatch material and linear low-density polyethylene are blended and extruded into granules. The masterbatch pretreatment not only improves the processing efficiency, but also avoids the problem of melting difficulty caused by the excessively long molecular chain when the ultra-high molecular weight polyethylene is directly mixed with the linear low-density polyethylene, thereby ensuring the stability of the material processing process.

[0061] In the above scheme, ultra-high molecular weight polyethylene (UHMWPE), high-density polyethylene (HDPE), and linear low-density polyethylene (LLDPE) are polyethylene materials that are differentiated according to polymerization method, molecular weight, and chain structure. UHMWPE is polyethylene with a molecular weight greater than 2 million. It has excellent self-lubrication and wear resistance, and its strength and toughness are also far superior to conventional polyethylene. However, UHMWPE has excessively high melt strength and extremely poor fluidity, making it difficult to process. The present application scheme adopts a masterbatch secondary dispersion processing method, mixing UHMWPE with a compound lubricating system, effectively improving its poor processing dispersibility.

[0062] In the embodiment of the present application, the compound lubricant includes an external lubricant and an auxiliary lubricant, the external lubricant is incompatible with polyethylene, and at least part of the auxiliary lubricant is compatible with polyethylene; the first preset weight ratio of the first substrate material is:

[0063] 30-70 parts of high-density polyethylene;

[0064] Ultra-high molecular weight polyethylene 0-40 parts;

[0065] 0-16 parts of external lubricant;

[0066] Auxiliary lubricant 0-2 parts;

[0067] Antioxidant 0.1-0.4 parts.

[0068] In the above embodiment, the external lubricant has a low surface energy, is incompatible with polyethylene, and is easily repelled by the polyethylene matrix on the cross section of the system, thereby migrating to the surface of the polyethylene to form an external lubricating layer. As a result, the external lubricant can be combined with the polyethylene, reducing the friction and adhesion between the polymer melt and the subsequent twin-screw extruder, thereby helping to reduce the main engine torque and improve the surface smoothness of the polymer.

[0069] Here, at least part of the auxiliary lubricant is compatible with polyethylene, which means that the auxiliary lubricant has a certain compatibility with polyethylene and can assist in providing a certain internal and external lubrication effect during the processing.

[0070] Typically, auxiliary lubricants have a low molecular weight and are mobile within the polymer. They are easily repelled from the polyethylene matrix during processing and migrate to the polyethylene surface. The auxiliary lubricant crystallizes with the polyethylene surface to form a unique two-dimensional film structure, which reduces the dynamic friction coefficient of the finished polyethylene material. The synergistic effect of the external lubricant and auxiliary lubricant effectively improves the melt flow index and reduces screw torque in subsequent extrusion equipment.

[0071] Furthermore, the external lubricant includes polysiloxane and fluoropolymer additives, and the auxiliary lubricant includes long-chain fatty acid amide; the first preset weight ratio of the first substrate material is:

[0072] 30-70 parts of high-density polyethylene;

[0073] Ultra-high molecular weight polyethylene 0-40 parts;

[0074] Silicone 0-15 parts;

[0075] Fluoropolymer additive 0-1 part;

[0076] 0-2 parts of long-chain fatty acid amide;

[0077] Antioxidant 0.1-0.4 parts.

[0078] For example, the first preset weight ratio of the first substrate material in the embodiment of the present application includes the following:

[0079] 30 parts high-density polyethylene, 1 part ultra-high molecular weight polyethylene, 5 parts silicone, 1 part fluoropolymer additive, 1 part long-chain fatty acid amide; or 70 parts high-density polyethylene, 40 parts ultra-high molecular weight polyethylene, 15 parts silicone, 1 part fluoropolymer additive, 2 parts long-chain fatty acid amide; or 50 parts high-density polyethylene, 20 parts ultra-high molecular weight polyethylene, 8 parts silicone, 0.5 part fluoropolymer additive, 1 part long-chain fatty acid amide. This is only illustrative in the examples of this application.

[0080] Here, polysiloxane (silicone), a typical non-polar external lubricant, rapidly migrates from the HDPE matrix to the melt surface, forming a dynamic isolation film that reduces adhesion between the melt and the screw / die. Fluoropolymer additives, due to the low surface energy of C-F bonds, further enhance interfacial slip. The two synergistically improve the stability of the interfacial lubrication layer, thereby enhancing extrusion surface quality. The polar amino groups of the long-chain fatty acid amides interact weakly with the PE segments, orienting the molecular chains within the matrix to reduce friction between the UHMWPE and HDPE segments. Simultaneously, some amide molecules migrate to the surface, forming a gradient-distributed composite lubricated interface with the external lubricant.

[0081] It can also be seen from this that silicone and fluoropolymer additives are the main lubricating ingredients, and long-chain fatty acid amides work synergistically with silicone and fluoropolymer additives for lubrication. Compared with the related technology without adding silicone and fluoropolymer materials, the dynamic friction coefficient of the material can be reduced from 0.4-0.5 to below 0.2. This setting is also conducive to reducing processing torque, reducing main machine current, and improving extrusion surface quality.

[0082] Exemplary external lubricants include silicone and fluororubber, and auxiliary lubricants include at least one of erucamide and oleamide. Specifically, the long-chain fatty acid amide can be stearamide or oleamide. These acid amide polymers not only provide external lubrication but are also compatible with polyethylene, thus providing internal lubrication.

[0083] In the embodiment of the present application, the processing aid includes carbon black masterbatch, and the second preset weight ratio of the masterbatch material to the second substrate material is:

[0084] 50-70 parts of linear low-density polyethylene;

[0085] High-density polyethylene 0-15 parts;

[0086] 15-25 parts of masterbatch material;

[0087] 3-6 parts of carbon black masterbatch;

[0088] Antioxidant 0.1-0.4 parts.

[0089] In the above scheme, the carbon black masterbatch is a polyethylene-based masterbatch with a carbon black content of 45%-50%; the antioxidant includes a hindered phenol antioxidant and a phosphite antioxidant, for example, antioxidant 1010, whose chemical name is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; or antioxidant 168, whose chemical name is tris(2,4-di-tert-butylphenyl)phosphite; or antioxidant DLTP, whose chemical name is dilauryl thiodipropionate. Of course, a variety of different antioxidants can be used in combination or alone.

[0090] For example, in the embodiment of the present application, the second preset weight ratio of the masterbatch material and the second substrate material includes the following:

[0091] 50 parts of linear low-density polyethylene, 2 parts of high-density polyethylene, 15 parts of masterbatch material, 3 parts of carbon black masterbatch, and 0.1 part of antioxidant; or, 70 parts of linear low-density polyethylene, 15 parts of high-density polyethylene, 25 parts of masterbatch material, 6 parts of carbon black masterbatch, and 0.5 part of antioxidant; or, 60 parts of linear low-density polyethylene, 8 parts of high-density polyethylene, 20 parts of masterbatch material, 4 parts of carbon black masterbatch, and 0.3 part of antioxidant. In this regard, the second preset weight ratio in the embodiment of the present application is only for illustration.

[0092] In the above embodiment, the resin system is primarily composed of linear low-density polyethylene to control the overall material density. The carbon black masterbatch utilizes a polyethylene-based masterbatch with a 45% carbon black content. By controlling the aforementioned weight ratio, the carbon black masterbatch can be added according to the lower limit of the latest industry standard for carbon black content, thereby controlling the carbon black content in the finished sheathing material to around 2%. This further reduces the material density, thereby reducing friction during the air-blowing construction process through weight reduction.

[0093] In addition, in the embodiment of the present application, the proportion weight of high-density polyethylene is controlled within 0-15 parts, which can prevent the low-temperature brittleness of the optical cable sheath material caused by the high crystallinity of high-density polyethylene, and make the linear low-density polyethylene the dominant matrix, ensuring that the optical cable sheath material does not break when bent during air blowing installation. At the same time, it is beneficial to reduce the material density and the overall weight to reduce the friction during the air blowing construction process.

[0094] like Figure 2 As shown, in some embodiments, in step 200, the mixed first substrate material is extruded and granulated to obtain a masterbatch material, comprising:

[0095] Step 201: putting the mixed first substrate material into an internal mixer for internal mixing to obtain a mixed pre-master batch material;

[0096] Step 202: feeding the pre-masterbatch material into a single-screw extruder for shearing, extrusion and granulation to obtain a masterbatch material.

[0097] In the above scheme, the internal mixer first performs high-shear mixing on the ultra-high molecular weight polyethylene in the temperature range of 160℃-190℃, so that the ultra-high molecular weight polyethylene is mixed and pre-dispersed in the high-density polyethylene matrix. Compared with direct dispersion by a twin-screw extruder, the dispersion efficiency is improved. During the internal mixing process, the external lubricant silicone is limitedly wrapped around the ultra-high molecular weight polyethylene, which is beneficial to reduce friction heat in subsequent processing.

[0098] Furthermore, in step 400, the mixed masterbatch material and the second base material are extruded and granulated to obtain an optical cable sheath material, comprising:

[0099] Step 401: feeding the mixed masterbatch material and the second base material into a twin-screw extruder for shearing, extrusion and granulation to obtain an optical cable sheath material.

[0100] Generally speaking, along the conveying direction of the material, the temperature of the body part gradually increases, and the temperature of the head part gradually decreases. Taking a single-screw extruder with a screw diameter of 45 mm in the related art as an example, the pulling speed of the single-screw extruder is 120m / min. Along the conveying direction of the single-screw extruder, the single-screw extruder is segmented into multiple body parts.

[0101] As can be seen in the above scheme, the first extrusion granulation is carried out using a single-screw extruder, and the second extrusion granulation is carried out using a twin-screw extruder. The single-screw extruder body temperature is within the range of 170-230℃ to complete the preparation of the masterbatch material for pre-granulation to obtain the masterbatch material.

[0102] Exemplarily, the mixing temperature of the internal mixer is 190°C and the mixing time is 10 minutes; along the conveying direction of the material, the single-screw extruder is divided into 5-7 temperature intervals, for example, the multiple temperature intervals of the single-screw extruder are set to 170°C, 180°C, 190°C, 200°C, and 200°C in sequence; along the conveying direction of the material, the twin-screw extruder is divided into 9-12 temperature intervals, for example, the multiple temperature intervals of the twin-screw extruder are set to 140°C, 160°C, 180°C, 200°C, 210°C, 210°C, 210°C, 210°C, 200°C, and 190°C.

[0103] In single-screw and twin-screw extruders, the front-end screw heating zone has a progressively higher temperature, while the neck / screen-changing and platform heating zones at the end are lower than the adjacent front-end screw heating zones. Twin-screw extruders melt-blend the premixed masterbatch and secondary substrate materials, activating the internal lubricant more quickly while mixing.

[0104] It should be noted that, in different scenarios, the number of divided temperature intervals and the temperature parameter settings of the single-screw extruder and the twin-screw extruder will also change, and the embodiments of this application are only used as examples to illustrate this.

[0105] Another embodiment of the present application further provides an optical cable sheath material, which is prepared using the preparation method of the optical cable sheath material proposed in any of the above embodiments.

[0106] Since the optical cable sheath material is obtained by the preparation method of the optical cable sheath material in any of the above embodiments, it has a lower friction coefficient and a lower density, which effectively reduces the difficulty of assembling large-diameter air-blown cables.

[0107] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0108] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for preparing an optical cable sheath material, characterized in that: The following steps are involved: Mixing a first base material according to a first preset ratio, wherein the first base material includes ultra-high molecular weight polyethylene, high-density polyethylene and a compound lubricant; Extruding and granulating the mixed first substrate material to obtain a masterbatch material; mixing the masterbatch material with a second substrate material according to a second preset ratio, wherein the second substrate material comprises high-density polyethylene, linear low-density polyethylene and a processing aid; Extruding and granulating the mixed masterbatch material and the second base material to obtain an optical cable sheath material; The step of extruding and granulating the mixed first substrate material to obtain a masterbatch material comprises: Putting the mixed first substrate material into an internal mixer for internal mixing to obtain internal mixed pre-masterbatch material; The pre-masterbatch material is fed into a single-screw extruder for shearing, extrusion and granulation to obtain the masterbatch material.

2. The method for preparing the optical cable sheath material according to claim 1, wherein: The method of extruding and granulating the mixed masterbatch material and the second base material to obtain the optical cable sheath material comprises: The mixed masterbatch material and the second base material are fed into a twin-screw extruder for shearing, extrusion and granulation to obtain an optical cable sheath material.

3. The method for preparing the optical cable sheath material according to claim 1 or 2, characterized in that: The compound lubricant includes an external lubricant and an auxiliary lubricant, the external lubricant is incompatible with polyethylene, and at least a portion of the auxiliary lubricant is compatible with the polyethylene; The first preset weight ratio of the first substrate material is: 30-70 parts of high-density polyethylene; Ultra-high molecular weight polyethylene 0-40 parts; 0-16 parts of external lubricant; Auxiliary lubricant 0-2 parts; Antioxidant 0.1-0.4 parts.

4. The method for preparing the optical cable sheath material according to claim 3, wherein: The external lubricant includes polysiloxane and fluoropolymer auxiliary agent, and the auxiliary lubricant includes long-chain fatty acid amide; The first preset weight ratio of the first substrate material is: 30-70 parts of high-density polyethylene; Ultra-high molecular weight polyethylene 0-40 parts; Silicone 0-15 parts; Fluoropolymer additive 0-1 part; 0-2 parts of long-chain fatty acid amide; Antioxidant 0.1-0.4 parts.

5. The method for preparing the optical cable sheath material according to claim 3, wherein: The external lubricant includes silicone and fluororubber, and the auxiliary lubricant includes at least one of erucamide and oleamide.

6. The method for preparing the optical cable sheath material according to claim 1 or 2, characterized in that: The processing aid includes carbon black masterbatch, and the second preset weight ratio of the masterbatch material and the second substrate material is: 50-70 parts of linear low-density polyethylene; High-density polyethylene 0-15 parts; 15-25 parts of masterbatch material; 3-6 parts of carbon black masterbatch; Antioxidant 0.1-0.4 parts.

7. The method for preparing the optical cable sheath material according to claim 6, characterized in that: The carbon black masterbatch is a polyethylene-based masterbatch with a carbon black content of 45%-50%.

8. The method for preparing the optical cable sheath material according to claim 6, characterized in that: The antioxidants include hindered phenol antioxidants and phosphite antioxidants.

9. The method for preparing the optical cable sheath material according to claim 1 or 2, characterized in that: The mixed first substrate material is put into an internal mixer for internal mixing. The internal mixing temperature of the internal mixer is 160° C.-190° C., and the internal mixing time is 10 minutes.

10. An optical cable sheath material, characterized in that: The optical cable sheath material is prepared by the preparation method of any one of claims 1 to 9.

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