Degradable low-smoke halogen-free flame-retardant cable

Abstract

The utility model discloses a degradable low-smoke halogen-free flame-retardant cable, which comprises the following components from inside to outside in sequence: a conductor of which the surface is coated with an anti-corrosion coating; an insulating layer; the shielding layer comprises a composite structure of a metal net and a degradable plastic layer; the sheath layer comprises an inner layer and an outer layer, and the shielding layer adopts a separable metal net and degradable plastic composite structure. The metal net is a copper net or an aluminum net and provides good electromagnetic shielding performance; while the shielding effect is ensured, the degradability of the shielding layer is realized. In addition, the connection mode between the metal net and the degradable plastic layer facilitates separation of metal and plastic in the recycling process, and the recycling rate is increased.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cable technical field, concretely relates to a kind of degradable low smoke halogen-free flame-retardant cable. BACKGROUND

[0002] In today's society, the use of cable is more and more, such as building, industrial production, communication network etc.But, traditional cable has many shortcomings.On the one hand, traditional cable is mainly halogen-containing material, which will release a large amount of hydrogen halide gas in the combustion process, posing a huge threat to the surrounding environment and the life safety of personnel.For example, in some large building fires, due to the burning of cable, a large amount of smoke and toxic gas will be released, resulting in a large number of casualties.In addition, since the material of traditional cable is mostly non-degradable, after the expiration of service life, a large amount of waste cable will be produced, which cannot be decomposed by itself, not only occupies a large amount of land resources, but also causes persistent pollution to water and soil environment, resulting in serious white pollution.

[0003] Although several halogen-free low smoke cables available on the market can well solve the harmful gases generated in the combustion process, their biodegradability needs to be improved.Some "green" cables on the market usually have low strength of biodegradable materials, which cannot meet the mechanical performance requirements in actual service, causing the cable to be easily damaged, thereby affecting the normal transmission of power supply and signal.

[0004] Some low smoke halogen-free flame-retardant cables have a gap in flame-retardant performance compared with traditional halogen-containing cables, and cannot provide sufficient safety guarantee for use in various complex environments.Therefore, it is of great practical significance to develop a cable that can meet the degradable requirements and has good low smoke halogen-free flame-retardant performance and mechanical properties. SUMMARY

[0005] The utility model aims at providing a kind of degradable low smoke halogen-free flame-retardant cable, to solve the problems of environmental pollution, non-degradable and low smoke halogen-free flame-retardant performance of traditional cable, realize the comprehensive promotion of cable in environmental protection, safety and performance.

[0006] To solve the above technical problems, the utility model aims at realizing as follows:

[0007] The degradable low smoke halogen-free flame-retardant cable comprises, from inside to outside, in sequence:

[0008] Conductor: its surface is coated with anticorrosive coating;

[0009] Insulating layer;

[0010] Shielding layer, comprising a composite structure of metal mesh and degradable plastic layer;

[0011] A sheath layer comprising an inner layer and an outer layer.

[0012] On the basis of the above scheme and as a preferred scheme of the above scheme: the anticorrosive coating is a nano-titanium dioxide coating.

[0013] On the basis of the above scheme and as a preferred scheme of the above scheme: the nano-titanium dioxide coating has a thickness of 3-8 μm.

[0014] On the basis of the above scheme and as a preferred scheme of the above scheme: the metal mesh of the shielding layer is a copper mesh or an aluminum mesh, which is wound on the degradable plastic layer when the degradable plastic layer is in a molten state.

[0015] On the basis of the above scheme and as a preferred scheme of the above scheme: the metal mesh has a mesh number of 60-80.

[0016] On the basis of the above scheme and as a preferred scheme of the above scheme: the inner layer is composed of a bio-based thermoplastic elastomer and a plant fiber short-cut filament, and the outer layer is composed of a starch-based plastic and nano-montmorillonite.

[0017] The utility model discloses compared with prior art outstanding and beneficial technical effect is: solve the traditional cable environmental pollution, non-degradable and low smoke halogen -free flame -retardant performance problem, realize cable in environmental protection, safety and performance comprehensive promotion, wherein, shielding layer adopts the metal mesh with degradable plastic composite structure of separable. The metal mesh selects copper mesh or aluminum mesh, provides good electromagnetic shielding performance, realizes the degradability of shielding layer while guaranteeing shielding effect. And, the connecting mode between metal mesh and degradable plastic layer is convenient for separating metal and plastic when recycling, improves the recycling rate. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the whole structure schematic diagram of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantage of the present application more clear, the technical scheme in the embodiment will be clearly and completely described below in conjunction with the drawings in the embodiment, obviously, the described embodiment is only a part of the present application, not all embodiments. Based on the given embodiment, all other embodiments obtained by those skilled in the art without making creative labor belong to the scope of protection of the present application.

[0020] In the description of the present application, it should be understood that the terms "upper", "lower" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0021] In the description of the present application, the terms "first", "second", and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated.

[0022] In detail Figure 1 As shown in the drawings, the present application discloses a degradable low-smoke halogen-free flame-retardant cable, which comprises, from inside to outside:

[0023] Conductor 1: Its surface is coated with an anti-corrosion coating; specifically, the conductor 1 selects a high-purity annealed copper conductor that meets the national standard to ensure good electrical conductivity. A layer of nano-titanium dioxide anti-corrosion coating is uniformly coated on the surface of the conductor 1 by spraying or dipping process, and then dried and cured at a certain temperature to form a nano-titanium dioxide anti-corrosion coating with a thickness of about 3-8 μm; nano-titanium dioxide has excellent photocatalytic activity and chemical stability, not only can effectively prevent the conductor 1 from being oxidized and corroded, prolong the service life of the conductor 1, but also can inhibit the growth of microorganisms to a certain extent, reduce the performance degradation of the cable caused by microbial erosion.

[0024] The insulating layer 2 is made of polyhydroxyalkanoate (PHA) and modified lignin blended material, and halogen-free flame retardant is added. Polyhydroxyalkanoate is a biodegradable thermoplastic polyester with good biocompatibility and mechanical properties; modified lignin is derived from renewable wood fiber raw materials, which not only enhances the degradability of the material, but also reduces the cost. In the application number 202410911580.3, a kind of polylactic acid-polyhydroxyalkanoate-based degradable composite material and its preparation method are disclosed, which belongs to the technical field of biodegradable materials, and the following steps are included: by combining ternary flame retardant with lignin, a composite material is obtained; the composite material is combined with vegetable oil to obtain a reinforcing modifier; polylactic acid, polyhydroxyalkanoate, reinforcing modifier, antioxidant and lubricant are mixed and added to a double screw extruder, then extruded after melt blending, water cooled, granulated, dried to obtain a polylactic acid-polyhydroxyalkanoate-based degradable composite material; in the technical scheme, the combination of lignin and ternary flame retardant not only toughens polylactic acid, but also improves the mechanical properties and ultraviolet resistance of polylactic acid; the combination of the composite material and vegetable oil improves the compatibility between the composite material and polylactic acid, polyhydroxyalkanoate, and also improves the plasticity and toughness of polylactic acid, and reduces the production cost; in addition, the phosphorus-based halogen-free flame retardant can form a stable carbonized layer when heated, which can isolate oxygen and heat, thereby achieving good flame retardant effect, and at the same time, it will not produce toxic and harmful gases, meeting the requirements of low smoke and halogen-free.

[0025] The shielding layer 3 includes a composite structure of metal mesh and degradable plastic layer; specifically, the shielding layer adopts a separable metal mesh and degradable plastic composite structure. The metal mesh is made of copper mesh or aluminum mesh, which provides good electromagnetic shielding performance; the degradable plastic is made of polybutylene succinate (PBS), and the copper mesh (mesh number 60-80 mesh) and the melt PBS (melt index 10g / 10min) are combined by a high-speed winding machine, with a winding tension of 5-8N, and after cooling, a shielding layer with a thickness of 0.8mm is formed. While ensuring the shielding effect, the degradable property of the shielding layer is realized. Moreover, the connection mode between the metal mesh and the PBS facilitates the separation of metal and plastic during recycling, improving the recycling rate.

[0026] The sheath layer 4 comprises an inner layer 41 and an outer layer 42. The sheath layer is a bio-based thermoplastic elastomer (TPE) and is uniformly mixed with degradable plant fiber short cut filaments, which enhance the mechanical strength and wear resistance of the sheath layer while maintaining the flexibility and degradability of the bio-based TPE. The outer layer is composed of starch-based plastic and nano-montmorillonite, and the addition of nano-montmorillonite significantly improves the strength and flame retardance of the material. Specifically, the bio-based thermoplastic elastomer (TPE) and the degradable plant fiber short cut filaments are uniformly mixed, which is no different from the prior art, such as the plant fiber master batch and its preparation method and application of application number 202011555783.1. The plant fibers of a certain size are first treated with an alkali solution, and then a plant fiber master batch is prepared by mixing the plant fibers with a thermoplastic elastomer and a silane coupling agent at a specific melting temperature at a lower temperature, which reduces the gas generation of the plant fibers. The plant fiber master batch is further used to prepare a plant fiber reinforced thermoplastic composite material, which has good mechanical properties, low odor, and can be applied to the fields of automotive interior materials, household appliance materials, etc. In addition, the compounding of starch-based plastic and nano-montmorillonite is no different from the prior art, such as the preparation method of nano-montmorillonite reinforced starch-based biodegradable blown film material of application number 202011154336.5, which comprises: S1, mixing raw material A containing plant starch, plasticizer, nano-montmorillonite and cationic surfactant, and then adding it into the extruder from the main feeding port; S2, mixing raw material B containing biodegradable plastic and processing aid, and then adding it into the extruder from the side feeding port, and then extruding and granulating to obtain the nano-montmorillonite reinforced starch-based biodegradable blown film material. The material is injection molded by an injection molding machine, the thickness of the outer sheath is controlled to be 1.5-2mm, and finally the inner sheath and the outer sheath are compounded into a complete sheath layer. The present application only uses the materials in the prior art to produce the inner layer 41 and the outer layer 42, and there is no improvement on the above-mentioned materials of the inner layer 41 and the outer layer 42.

[0027] The above embodiments are only preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A degradable low smoke halogen-free flame retardant cable, characterized in that, From inside to outside in turn includes: Conductor (1): its surface is coated with anticorrosive coating; Insulating layer (2); Shielding layer (3), including the composite structure of metal mesh and degradable plastic layer; Sheath layer (4), which includes inner layer and outer layer.

2. The degradable low smoke, halogen-free, flame retardant cable of claim 1, wherein, The anticorrosive coating is nano titanium dioxide coating.

3. The degradable low smoke, halogen-free, flame retardant cable of claim 2, wherein, The thickness of the nano titanium dioxide coating is 3-8 μm.

4. The degradable low smoke, halogen-free, flame retardant cable of claim 1, wherein, The metal mesh of the shielding layer is copper mesh or aluminum mesh, which is wound on the degradable plastic layer when the degradable plastic layer is in a molten state.

5. The degradable low smoke, halogen-free, flame retardant cable of claim 4, wherein, The mesh number of the metal mesh is 60-80 mesh, and the melt index of the degradable plastic layer is 10 g / 10 min.

6. The degradable low smoke, halogen-free, flame-retardant cable of claim 1, wherein, The inner layer is composed of bio-based thermoplastic elastomer and plant fiber chopped strands, and the outer layer is composed of starch-based plastic and nano montmorillonite.

Images