Lightweight vehicle-mounted optical cable and preparation process thereof

Abstract

The invention discloses a light-weight vehicle-mounted optical cable and a preparation process thereof. The light-weight vehicle-mounted optical cable sequentially comprises an optical fiber, a buffer layer, a yarn reinforcing piece and an outer sheath layer from inside to outside, the outer sheath layer comprises a base material, a flame retardant, a light filler and other auxiliaries, the base material comprises thermoplastic polyurethane or cross-linked polyolefin, the light filler comprises hollow glass beads and / or ceramic hollow beads, and the other auxiliaries comprise a silane coupling agent and / or a compatilizer. Through accurate model selection of the optical fiber, the buffer layer, the yarn-type reinforcing member and the outer sheath material, the optical cable has a wide working temperature range, excellent weather resistance and chemical resistance, excellent mechanical properties and environmental adaptability, is lower in cost, can be used in vehicle-mounted high-speed data transmission scenes, and has wide application prospects. The problem that light weight, high reliability and low cost are difficult to consider at the same time is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical fiber communication cables, in particular to a light-weight vehicle-mounted optical cable and a preparation process thereof. BACKGROUND

[0002] With the deep transformation of the automotive industry towards intelligence and networking, the complexity of automotive electronic systems is increasing exponentially. The comprehensive popularization of advanced driver assistance systems (ADAS), the iterative upgrade of autonomous driving technology, and the multi-dimensional interconnection demand of vehicle-to-vehicle, vehicle-to-road, and vehicle-to-cloud have accelerated the evolution of vehicles from traditional transportation tools to data centers on wheels. In the field of vehicle-mounted communication, optical fibers gradually become the key technology direction to replace copper cables due to their core advantages of high speed, high reliability (low signal attenuation and small error rate), strong anti-electromagnetic interference capability (not affected by the electromagnetic environment of vehicle-mounted high-voltage electrical appliances and motors), and light weight. As the core carrier of vehicle-mounted optical fiber communication, the performance of optical fiber harness, which is composed of optical cables, optical fiber connectors, and branching components, directly determines the quality of vehicle-mounted data transmission. Compared with traditional copper cables, optical fiber cables are smaller and lighter, which not only optimizes the wiring space in the vehicle and reduces the deployment difficulty of the whole vehicle, but also reduces the energy consumption of the vehicle, in line with the light-weight development trend of the automotive industry.

[0003] However, the existing vehicle-mounted optical cable technology still has obvious shortcomings. On the one hand, when the transmission rate of copper cables needs to break through 10 GB / s, the transmission performance needs to be guaranteed by increasing the cross-sectional area of the wire and adding multiple shielding structures, which will lead to an increase in the weight and cost of copper cables, which is contrary to the design goal of light weight and low cost of the whole vehicle. On the other hand, the existing light-weight vehicle-mounted optical cable solution has performance defects. The light-weight anti-vibration vehicle-mounted optical cable disclosed in Chinese patent CN118259411A achieves weight reduction and shock absorption through a porous foam layer, but the porous foam structure will cause the optical cable to have reduced compression strength and be unable to withstand the complex mechanical extrusion environment in the vehicle (such as the chassis wiring area and the door panel interlayer). In addition, the composite structure of polyethylene (PE), nylon, and porous foam used in this solution has weak flame retardant performance, and it is difficult to form an effective flame retardant system after the three are compounded, making it difficult to achieve the flame retardant effect required by vehicle-mounted applications. Therefore, there is an urgent need to develop a vehicle-mounted optical cable solution that combines light weight, reliability, and low cost to meet the demand for high-speed, stable, and safe communication in intelligent vehicles. SUMMARY

[0004] To solve the above technical problems, one object of the present application is to provide a light-weight vehicle-mounted optical cable that can be applied to automobiles, special vehicles, and vehicle-mounted communication systems, and has excellent adaptability to signal transmission requirements in high-voltage environments, complex road conditions, and electromagnetic interference scenarios.

[0005] Another object of the present application is to provide a preparation process of a light-weight vehicle-mounted optical cable, which clearly defines the process flow details to ensure the stable manufacturability of the optical cable.

[0006] The above object of the present application is achieved by the following technical solutions.

[0007] The present application provides a light-weight vehicle-mounted optical cable in the first aspect, which comprises optical fibers, a buffer layer, a yarn-based reinforcing member and an outer sheath layer from inside to outside in sequence.

[0008] The buffer layer is coated on the outside of each optical fiber and is composed of thermoplastic or elastomer with a Shore hardness of 72D or below.

[0009] The yarn-based reinforcing member is arranged on the outside of the buffer layer and is formed by twisted covering of fiber yarn with a tensile modulus of not less than 100 GPa.

[0010] The outer sheath layer is coated on the outside of the yarn-based reinforcing member, and the composition of the outer sheath layer includes a base material, a flame retardant, a lightweight filler and other additives, the base material includes thermoplastic polyurethane (TPU) or cross-linked polyolefin (XLPO), the lightweight filler includes hollow glass microbeads (HGM) and / or ceramic hollow microbeads (CHM), and the other additives include silane coupling agent and / or compatibilizer.

[0011] The present application selects the optical fibers, the buffer layer, the yarn-based reinforcing member and the outer sheath material precisely, so that the optical cable has a wide working temperature range, excellent weather resistance and chemical resistance, and at the same time has excellent mechanical properties and environmental adaptability, and the cost is lower, which can be used in vehicle-mounted high-speed data transmission scene, effectively solving the problem that light weight, high reliability and low cost are difficult to be considered.

[0012] Further, the optical fiber is single or multiple.

[0013] Further, the optical fiber is preferably a bend-resistant optical fiber.

[0014] Further, the optical fiber is a single-mode G.657B3 optical fiber, a multi-mode OM3 optical fiber or a multi-mode OM4 optical fiber.

[0015] Further, the optical fiber can also be a single-mode G.657B3 optical fiber, a multi-mode OM3 optical fiber or a multi-mode OM4 optical fiber with a high-temperature-resistant coating (resistant to 150 ℃).

[0016] Further, the material of the buffer layer is nylon 12.

[0017] Further, the thickness of the buffer layer is 0.15-0.33 mm.

[0018] The buffer layer has excellent stress absorption capacity, can absorb mechanical stress applied by the outside world and stress generated due to changes in environmental temperature and humidity, and can absorb most of the stress.

[0019] Further, the fiber yarns of the yarn-based reinforcement are aramid fiber yarns or polyarylate liquid crystal polymer (LCP) fiber yarns.

[0020] Further, the fiber yarns are preferably 6-8, 1000-1200 dtex.

[0021] Further, the twisting pitch of the yarn-based reinforcement is 0.2-1.0 m.

[0022] The yarn-based reinforcement provides sufficient tensile performance support for the optical cable.

[0023] Further, the content of the base material in the outer sheath layer is 35-60 wt%.

[0024] Further, the base material includes a thermoplastic polyurethane elastomer (TPU) resistant to 125 ℃ or a cross-linked halogen-free flame-retardant polyolefin (XLPO).

[0025] Further, the thermoplastic polyurethane elastomer is of the polyether type, and the hard segment is formed by the reaction of 4,4'-diphenyl methane diisocyanate (MDI) and a chain extender.

[0026] Further, when the chain extender is hydroquinone dihydroxyethyl ether (HQEE) or 1,4-butanediol (BDO), the mass content of the hard segment of the thermoplastic polyurethane elastomer is 52-60%.

[0027] Specifically, when the chain extender is hydroquinone dihydroxyethyl ether (HQEE), the mass content of the hard segment is 52-58%; when the chain extender is 1,4-butanediol (BDO), the mass content of the hard segment is 56%-60%.

[0028] Further, the content of the flame retardant in the outer sheath layer is 20-52 wt%.

[0029] Further, the flame retardant is selected from one or more of hexaphenoxycyclotriphosphazene (HCTP), melamine cyanurate (MCA), coated ammonium polyphosphate (APP), pentaerythritol (PER), melamine (MEL), aluminum hydroxide, magnesium hydroxide, and zinc borate (ZB).

[0030] Further, the content of the lightweight filler in the outer sheath layer is 8-15 wt%. Too high a content will cause the filler to agglomerate, deteriorating the material processing performance and mechanical properties, especially the impact toughness; too low a content will not significantly reduce the weight and enhance the effect.

[0031] Further, the density of the light filler is 0.5-0.7 g / cm 3 , and the particle size distribution is 10-50 μm.

[0032] Further, the content of other additives in the outer sheath layer is 3-8 wt%.

[0033] Further, the content of silane coupling agent in the outer sheath layer is 0.5-4 wt%.

[0034] Further, the silane coupling agent is amino silane or vinyl silane.

[0035] Further, the compatibilizer is maleic anhydride grafted polymer, which can be ethylene-propylene-diene rubber grafted maleic anhydride or ethylene-octene copolymer grafted maleic anhydride.

[0036] Further, the other additives further include lubricant, antioxidant, crosslinking aid, color masterbatch, dispersant, etc., and the specific proportion of each part varies according to the base material.

[0037] Among the other additives, the silane coupling agent and the compatibilizer are basic additives, and the lubricant, antioxidant, crosslinking aid, color masterbatch, dispersant, etc. are optional additives.

[0038] Further, the lubricant is stearate compound or hydrocarbon compound, such as polyethylene wax.

[0039] Further, the antioxidant is hindered phenol compound.

[0040] Further, the antioxidant can also be composite antioxidant, which is compounded by hindered phenol compound and phosphite compound, and the compounding ratio is preferably 1:1-2:1.

[0041] Further, the crosslinking aid is organic tin catalyst, such as dibutyl tin dilaurate.

[0042] Further, the dispersant is polyurethane dispersant or acrylic ester copolymer.

[0043] Further, the composition of the outer sheath layer further includes organic montmorillonite (OMMT).

[0044] Further, the content of organic montmorillonite in the outer sheath layer is 2-4 wt%.

[0045] In a specific embodiment, the composition of the outer jacket layer comprises 55-60 wt% thermoplastic polyurethane, 12-15 wt% HCTP, 4-6 wt% MCA, 10-15 wt% lightweight filler, 2-3 wt% OMMT, 5-10 wt% aluminum hydroxide, 0.5-1 wt% silane coupling agent, 3-4 wt% lubricant, 0.5-1 wt% composite antioxidant, 1-1.5 wt% color masterbatch, and 1-1.5 wt% dispersant.

[0046] In a specific embodiment, the composition of the outer jacket layer comprises 40-45 wt% crosslinked polyolefin, 21-30 wt% APP, 7-10 wt% PER, 4-7 wt% MEL, 10-15 wt% lightweight filler, 2-4 wt% OMMT, 3-5 wt% ZB, 2-4 wt% compatibilizer, 0.5-1 wt% antioxidant, 0.2-0.5 wt% crosslinking aid, and 0.3-0.5 wt% lubricant.

[0047] Further, the outer diameter of the lightweight vehicle-mounted optical cable is 2.0-5.0 mm.

[0048] The second aspect of the present application provides a preparation process of the lightweight vehicle-mounted optical cable of the first aspect, comprising the following steps:

[0049] (1) coloring or keeping the original color of the optical fiber;

[0050] (2) extruding thermoplastic plastic or elastomer outside the treated optical fiber to form a buffer layer;

[0051] (3) wrapping the yarn-like reinforcing member in a spiral manner outside the buffer layer;

[0052] (4) extruding an outer jacket layer composed of a base material, a lightweight filler, and other additives outside the reinforcing member to obtain the lightweight vehicle-mounted optical cable.

[0053] Further, in step (1), the optical fiber is colored or kept in the original color, and surface cleaning and drying treatment are performed.

[0054] Further, the surface cleaning and drying treatment is completed by oven heating and electrostatic removal device.

[0055] Further, in step (2), the extrusion temperature is 200-240 ℃.

[0056] Further, in step (3), the twisting tension of the spiral twisting is 5-10 N.

[0057] Further, in step (4), the outer sheath layer is melt blended and granulated before extrusion, the melt blending and granulation is carried out in an internal mixer, and a double screw with low shear screw design is used for extrusion granulation.

[0058] Further, the melt blending and granulation is carried out in an internal mixer, the base material is first added, then a mixture of lightweight fillers and other additives is injected at a low speed in a section below 100 DEG C, and then a double screw with low shear screw design is used for extrusion granulation.

[0059] When the base material is a thermoplastic polyurethane, the extrusion temperature of the double screw is 190-210 DEG C, and the mixing temperature of the internal mixer is 170-190 DEG C.

[0060] When the base material is a cross-linked polyolefin, the extrusion temperature of the double screw is 170-190 DEG C, and the mixing temperature of the internal mixer is 150-180 DEG C.

[0061] Low-temperature and low-speed injection of lightweight fillers is a key process to protect the structure of hollow microbeads, and can effectively avoid the breakage of microbeads caused by high temperature and high shear force. The low shear screw design is also to protect the hollow microbeads from being sheared and damaged during the extrusion process.

[0062] Further, in step (4), an extruder is used for extrusion.

[0063] Further, the length-diameter ratio (L / D) of the screw of the extruder is (15-25): 1, and a pull tube die is used, and after extrusion, water cooling is performed for shaping, and then the line is collected to the optical cable reel.

[0064] Further, in step (4), when the base material is a cross-linked polyolefin, a step of cross-linking treatment of the outer sheath layer is further included.

[0065] Further, the cross-linking treatment is warm water cross-linking, steam cross-linking or natural cross-linking.

[0066] Further, the cross-linking treatment can be carried out at a speed of 85-95 DEG C, 3-5 h / mm of the thickness of the outer sheath.

[0067] The beneficial effects of the present application are:

[0068] 1. The lightweight vehicle-mounted optical cable provided by the present application has a significant lightweight advantage, and compared with single pair Ethernet (SPE), the weight can be reduced by more than 50%; even compared with the same specification optical cable, the weight can also be reduced by about 10%, meeting the core demand of weight reduction and energy saving in vehicle-mounted scenarios.

[0069] 2. In terms of reliability, the light-weight vehicle-mounted optical cable provided by the application exhibits excellent mechanical properties and environmental adaptability, not only meeting the tensile requirement of more than 150 N to ensure the structural stability during wiring and use, but also being able to work stably in the working temperature range of -40~125 ℃, and being applicable to the complex temperature environment of vehicle, such as low-temperature start in winter and high-temperature engine compartment in summer.

[0070] 3. The light-weight vehicle-mounted optical cable provided by the application has outstanding weather resistance and chemical resistance, and has good resistance to humid heat environment, ultraviolet radiation and ozone corrosion. Even if it is in contact with common cleaning agents, fuel, engine oil and other common vehicle chemicals, it can effectively resist corrosion, ensure the performance stability during long-term use, and prolong the service life of the optical cable.

[0071] 4. The hollow glass microbeads or ceramic hollow microbeads used in the light-weight vehicle-mounted optical cable provided by the application are regular spherical, the interaction between particles is weak, and they have excellent fluidity and dispersibility, and can be quickly and uniformly dispersed in different sheath material systems. This characteristic can significantly improve the extrusion performance of the material during the sheath processing of the optical cable, not only reducing the problems such as surface defects and internal bubbles of the product, but also improving the production efficiency and ensuring the batch quality consistency of the product.

[0072] 5. The light-weight vehicle-mounted optical cable provided by the application has good low-smoke halogen-free flame retardant capability, can meet the UL 94-V0 flame retardant grade and the special flame retardant standard for vehicle wiring harness, and can effectively inhibit the spread of combustion and reduce the release of toxic smoke in extreme scenes such as vehicle collision and short circuit. In addition, due to the reduction of the density of the sheath material, the production cost of the optical cable is also effectively controlled, which realizes high performance while considering economy.

[0073] 6. The light-weight vehicle-mounted optical cable provided by the application has the characteristics of light weight, high reliability, weather resistance and chemical resistance, and low cost, not only can well meet the strict requirements of vehicle optical fiber communication scene and ensure stable transmission of signals in complex vehicle environment, but also can be applied to more scenes requiring high-performance optical cables such as rail transit communication and industrial control communication by virtue of the cost reduction effect of low-density sheath, breaking through the limitation of single application scene, and improving the practical value and popularity of the optical cable technology. BRIEF DESCRIPTION OF DRAWINGS

[0074] Figure 1 It is a cross-sectional schematic view of the light-weight vehicle-mounted optical cable of Example 1.

[0075] The figure shows: 1-optical fiber; 2-buffer layer; 3-yarn type reinforcing member; 4-outer sheath layer. DETAILED DESCRIPTION

[0076] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0077] The application will be further described with reference to the drawings and specific examples in which the application is not limited, and which will serve to illustrate the application further to those skilled in the art.

[0078] The experimental methods used in the following examples are conventional unless otherwise specified, and the materials, reagents, etc. used are commercially available unless otherwise specified.

[0079] Example 1

[0080] A light-weight vehicle-mounted optical cable, a cross-sectional schematic view of which is shown in Figure 1 The light-weight vehicle-mounted optical cable comprises, in order from the inside out, optical fibers 1, a buffer layer 2, a yarn-based reinforcing member 3, and an outer sheath layer 4, and the outer diameter of the light-weight vehicle-mounted optical cable is 3.0 mm.

[0081] The optical fibers are two multimode OM3 optical fibers conforming to the IEC / ISO OM3 standard, the outer diameter of the coating layer of which is 245 μm, the material of the coating layer is an acrylic resin resistant to 150°C, and the optical fibers are colored to achieve differentiation;

[0082] The buffer layer is wrapped on the outside of each optical fiber, the material of the buffer layer is nylon 12, and the thickness of the buffer layer is 0.175 mm.

[0083] The yarn-based reinforcing member is arranged on the outside of the buffer layer, and the fiber yarn of the yarn-based reinforcing member is six aramid fiber yarns of 1100 dtex.

[0084] The outer sheath layer is wrapped on the outside of the yarn-based reinforcing member, and the composition of the outer sheath layer comprises 54 wt% of polyether TPU with 55% of hard segment (MDI-HQEE), 15 wt% of HCTP, 5 wt% of MCA, 10 wt% of hollow glass microbeads, 2 wt% of OMMT, 8 wt% of aluminum hydroxide, 0.5 wt% of γ-aminopropyl triethoxysilane, 3 wt% of polyethylene wax, 0.5 wt% of composite antioxidant (antioxidant 1010 and antioxidant 168 in a compounding ratio of 1:1), 1 wt% of polyurethane dispersant, and 1 wt% of color masterbatch.

[0085] The preparation process of the light-weight vehicle-mounted optical cable of Example 1 comprises the following steps:

[0086] (1) Fiber coloring: Two optical fibers are colored, and surface cleaning and drying treatment are performed by oven heating and static electricity removal device to remove surface moisture and impurities.

[0087] (2) Extrusion buffer layer: A layer of nylon 12 is extruded outside the treated optical fiber, the extrusion temperature is 200 ℃, and the buffer layer is formed after cooling and setting.

[0088] (3) Yarn type reinforcing element twisting: Aramid fiber yarn is uniformly coated outside the buffer layer in a spiral twisting manner by using high-speed twisting cage, the twisting tension is 5 N, and the twisting pitch is 0.2 m.

[0089] (4) Sheath extrusion: The components of the outer sheath layer are blended in an internal mixer. In order to avoid the breakage of hollow glass microbeads, polyether TPU and flame retardant are added first, then hollow glass microbeads and other additives are injected at a low speed in a section below 100 ℃, and then a double screw with low shear screw design is used for extrusion. The extrusion temperature of the double screw is 190 ℃, the mixing temperature of the internal mixer is 170 ℃, and the extruded material is cooled and granulated after extrusion; the extruder with a length-diameter ratio of 20:1 and a tube drawing mold are used to extrude the granules outside the yarn type reinforcing element to form the outer sheath layer, which is water-cooled and set after extrusion, and finally wound onto the optical cable reel.

[0090] Example 2

[0091] A lightweight vehicle-mounted optical cable, the lightweight vehicle-mounted optical cable comprises optical fibers, a buffer layer, a yarn type reinforcing element and an outer sheath layer from inside to outside in sequence, the outer diameter of the lightweight vehicle-mounted optical cable is 3.0 mm;

[0092] The optical fibers are two G.657B3 single-mode optical fibers, and the optical fibers are colored to distinguish them.

[0093] The buffer layer is coated outside each optical fiber, the material of the buffer layer is nylon 12, and the thickness of the buffer layer is 0.175 mm.

[0094] The yarn type reinforcing element is arranged outside the buffer layer, and the fiber yarn of the yarn type reinforcing element is six 1100 dtex LCP fiber yarns.

[0095] The outer sheath layer is coated outside the yarn type reinforcing element, and the components of the outer sheath layer include 45 wt% cross-linked polyolefin (silane cross-linked POE), 21 wt% APP, 7 wt% PER, 4 wt% MEL, 15 wt% ceramic hollow microbeads, 2 wt% OMMT, 3 wt% ZB, 2 wt% ethylene-octene copolymer grafted maleic anhydride, 0.5 wt% (antioxidant 1010 and antioxidant 168 in a complex ratio of 1:1), 0.2 wt% dibutyltin dilaurate and 0.3 wt% polyethylene wax.

[0096] The preparation process of the lightweight vehicle-mounted optical cable of Example 2 includes the following steps:

[0097] (1) Fiber coloring: Color two optical fibers, and perform surface cleaning and drying treatment by an oven heating and an electrostatic removal device to remove surface moisture and impurities.

[0098] (2) Extrusion of buffer layer: Extrude a layer of nylon 12 outside the treated optical fiber, the extrusion temperature is 240 DEG C, and the buffer layer is formed after cooling and setting.

[0099] (3) Yarn type reinforcing element stranding: The LCP fiber yarn is uniformly coated outside the buffer layer in a spiral stranding manner by using a high-speed stranding cage, the stranding tension is 10 N, and the stranding pitch is 1.0 m.

[0100] (4) Sheath extrusion: The components of the outer sheath layer are blended in an internal mixer, cross-linked polyolefin and flame retardant are first added, then ceramic hollow microbeads and other additives are slowly injected at a section lower than 100 DEG C, and then a double screw with a low shear screw design is used for extrusion, the extrusion temperature of the double screw is 180 DEG C, the mixing temperature of the internal mixer is 180 DEG C, and the extruded material is cooled and granulated after extrusion; the extruder with a length-diameter ratio of 20:1 and the tube drawing mold are used to extrude the granules outside the yarn type reinforcing element to form the outer sheath layer, the extruded material is water-cooled and set after extrusion, is naturally cross-linked, and is finally wound on the optical cable reel.

[0101] According to GB / T 19666-2019 "Flame-retardant and fire-resistant cable general", the lightweight vehicle-mounted optical cables of Examples 1 and 2 can meet the requirements of 125 DEG C long-term working temperature, UL 94-V0 flame-retardant grade, and smoke density transmittance ≥60%, and the weight of the optical cable is <6.5 g / m.

[0102] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Those skilled in the art should understand that on the basis of the above description, other different forms of changes or variations can also be made. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A lightweight vehicle-mounted optical cable, characterized by comprising: The light-weight vehicle-mounted optical cable comprises, from inside to outside, optical fibers, a buffer layer, a yarn-based reinforcing member, and an outer sheath layer. The buffer layer is wrapped outside each optical fiber and is made of thermoplastic plastic or elastomer with a Shore hardness of 72D or below. The yarn-based reinforcing member is arranged outside the buffer layer and is formed by twistedly wrapping fiber yarns with a tensile modulus of not less than 100 GPa. The outer sheath layer is wrapped outside the yarn-based reinforcing member, and the composition of the outer sheath layer comprises a base material, a flame retardant, a lightweight filler, and other additives, the base material comprises thermoplastic polyurethane or cross-linked polyolefin, the lightweight filler comprises hollow glass microbeads and / or ceramic hollow microbeads, and the other additives comprise silane coupling agent and / or compatibilizer.

2. The lightweight in-vehicle optical cable according to claim 1, characterized by, The optical fibers are single-mode G.657B3 optical fibers, multi-mode OM3 optical fibers, or multi-mode OM4 optical fibers; the fiber yarns of the yarn-based reinforcing member are aramid fiber yarns or polyarylate liquid crystal polymer fiber yarns; and the twisting pitch of the yarn-based reinforcing member is 0.2-1.0 m.

3. The lightweight in-vehicle optical cable according to claim 1, characterized by, The content of the base material in the outer sheath layer is 35-60 wt%; the content of the flame retardant in the outer sheath layer is 20-52 wt%; the content of the light weight filler in the outer sheath layer is 8-15 wt%; the density of the light weight filler is 0.5-0.7 g / cm 3 ; the particle size distribution is 10-50 μm; and the content of other auxiliary agents in the outer sheath layer is 3-8 wt%. 3 The content of the base material in the outer sheath layer is 35-60 wt%; the content of the flame retardant in the outer sheath layer is 20-52 wt%; the content of the light weight filler in the outer sheath layer is 8-15 wt%; the density of the light weight filler is 0.5-0.7 g / cm 3 ; the particle size distribution is 10-50 μm; and the content of other auxiliary agents in the outer sheath layer is 3-8 wt 4. The lightweight in-vehicle optical cable according to claim 1, characterized by, The flame retardant is selected from one or more of hexaphenoxycyclotriphosphazene, melamine cyanurate, coated ammonium polyphosphate, pentaerythritol, melamine, aluminum hydroxide, magnesium hydroxide, and zinc borate.

5. The lightweight in-vehicle optical cable according to claim 1, characterized by, The other additives further comprise one or more of lubricant, antioxidant, cross-linking aid, color masterbatch, and dispersant; the lubricant is a stearate compound or a hydrocarbon compound; the antioxidant is a composite antioxidant; the cross-linking aid is an organic tin catalyst; and the dispersant is a polyurethane dispersant or an acrylic ester copolymer.

6. The lightweight in-vehicle optical cable according to claim 1, characterized by, The composition of the outer sheath layer further comprises organic montmorillonite; and the content of the organic montmorillonite in the outer sheath layer is 2-4 wt%.

7. A process for the production of the light weight optical cable as claimed in any one of claims 1 to 6, wherein, The method comprises the following steps: (1) coloring or keeping the original color of the optical fibers; (3) extruding thermoplastic plastic or elastomer outside the treated optical fibers to form a buffer layer; (3) wrapping the yarn-based reinforcing member outside the buffer layer in a spiral twisting manner; (4) extruding an outer sheath layer composed of a base material, a lightweight filler, and other additives outside the reinforcing member to obtain the light-weight vehicle-mounted optical cable.

8. The manufacturing process of claim 7, wherein, In step (4), the base material, the lightweight filler, and the other additives are melt-blended and granulated before extrusion of the outer sheath layer; the melt-blending and granulation are performed in an internal mixer, and a double screw with a low-shear screw design is used for extrusion granulation.

9. The manufacturing process of claim 8, wherein, When the base material is thermoplastic polyurethane, the extrusion temperature of the double screw is 190-210 ℃, and the mixing temperature of the internal mixer is 170-190 ℃; when the base material is cross-linked polyolefin, the extrusion temperature of the double screw is 170-190 ℃, and the mixing temperature of the internal mixer is 150-180 ℃.

10. The manufacturing process of claim 7, wherein, In step (4), when the base material is cross-linked polyolefin, a step of cross-linking treatment of the outer sheath layer is further included.

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