CN104200906A - Purple-light cross-linked low-smoke halogen-free high flame-retardant EVA cable and production method thereof - Google Patents

Abstract

The invention provides a purple-light cross-linked low-smoke, halogen-free, high-flame-retardant EVA wire and cable, which includes a conductor, a shielding layer is arranged outside the conductor, an ultraviolet crosslinking insulating layer is arranged outside the shielding layer, and ceramics are arranged outside the ultraviolet crosslinking insulating layer. Silicone rubber layer, the ceramic silicone rubber layer is provided with an anti-corrosion layer, and the conductors are filled with flame-retardant glass fiber filling ropes. UV cross-linking protective layer, inner UV cross-linking protective layer with armor layer outside, armored layer with outer UV cross-linking protective layer, outer UV cross-linking protective layer with waterproof layer, waterproof layer with SBS outside Rubber layer, the outside of the SBS rubber layer is coated with an anti-ultraviolet layer. The invention also provides a preparation method of the electric wire and cable. The electric wire and cable of the present invention is provided with multiple flame-retardant layers and a waterproof layer at the same time, so that the present invention is a purple-light cross-linked low-smoke, halogen-free, high-flame-retardant EVA electric wire and cable.

Description

Ziguang cross-linked low-smoke, halogen-free, high flame-retardant EVA wire and cable and preparation method thereof

technical field

The invention relates to a wire and cable and a preparation method thereof, in particular to a purple-light cross-linked low-smoke, halogen-free, high flame-retardant EVA wire and cable and a preparation method thereof.

Background technique

Wire and cable is a wire product used to transmit electric (magnetic) energy, information and realize electromagnetic energy conversion. As the main carrier of power transmission, wire and cable are widely used in electrical equipment, lighting circuits, household appliances, etc. The quality of wire and cable directly affects the quality of the project and the safety of consumers' lives and property. Although the wire and cable industry is only a supporting industry, it accounts for 1/4 of the output value of China's electrical industry. It has a wide variety of products and a wide range of applications, involving industries such as electric power, construction, communications, and manufacturing, and is closely related to various sectors of the national economy. Wires and cables are also known as the "arteries" and "nerves" of the national economy. They are indispensable basic equipment for transmitting electric energy, transmitting information, manufacturing various motors, instruments, and meters, and realizing electromagnetic energy conversion. Basic products necessary in a modernized society.

The current wire and cable industry is constantly deriving new products in response to the needs of special occasions, such as fire-resistant cables, flame-retardant cables, low-smoke zero-halogen/low-smoke low-halogen cables, termite-proof, mouse-proof cables, oil-resistant/cold-resistant /temperature-resistant/wear-resistant cables, medical/agricultural/mining cables, thin-walled wires, etc.

With the improvement of people's safety awareness, people have higher and higher requirements for the flame retardancy and fire resistance of wires and cables. High flame-retardant wires and cables are currently a focus of people's attention.

In many large-scale fire accidents in public places, the cause of most deaths is suffocation due to inhalation of corrosive and toxic smoke gases released by wires and cables (polymers) during combustion. Flame-retardant and low-smoke treatment of wire and cable materials has been recognized as an important measure to fundamentally prevent and reduce fires and reduce people's lives and property losses.

The current wires and cables include PVC, PE, PP and other wires and cables in terms of materials. PVC material has excellent mechanical and physical properties, flexibility, chemical resistance, cheap price, and excellent processing performance, and is widely used in wires and cables. However, PVC contains halogen elements, so it releases harmful, corrosive and toxic gases when burned. At present, other materials have been gradually used to replace PVC. Wires and cables are suffocated by the corrosive and toxic smoke gas released when they burn, not only the resins such as PVC containing halogen elements in their main components, but also some halogen-containing flame retardants used in them. In order to improve the flame retardancy of wires and cables, people usually add some flame retardants to their materials. Traditionally, these flame retardants are halogen-containing substances. Studies have shown that halogenated flame retardants (HFRs) are harmful to life and the environment, and legislation has been put in place to limit the use of these materials with the ultimate goal of terminating the use of most of these products. For example, decabromodiphenyl ether is a HFR that has been banned in the European Union.

Ethylene-vinyl acetate copolymer (EVA), which has good flexibility, impact resistance, and environmental stress cracking resistance in a wide temperature range, uses EVA as the cable material matrix to perform halogen-free flame retardant on it, and Improving the mechanical properties of flame-retardant cable materials to meet the technical performance requirements of low-smoke, halogen-free, flame-retardant cable sheath materials is of great value for the popularization and application of low-smoke, halogen-free, flame-retardant cable materials.

At present, the cross-linking of low-smoke halogen-free flame-retardant insulating materials for wires and cables mainly adopts electron beam irradiation, which has the disadvantages of large investment, easy generation of electron traps (electron accumulation), electrostatic effects, environmental protection and difficulty in operation and maintenance, etc. . Since there is no suitable alternative cross-linking method, in the field of low-smoke halogen-free flame-retardant cable materials, electron beam irradiation cross-linking still occupies a dominant position in the current cross-linking technology.

For the development of social economy, as well as to protect the environment and people's property safety and health, it is necessary to develop a purple light cross-linked low-smoke, halogen-free and high flame-retardant EVA wire and cable.

Contents of the invention

Purpose of the invention: The purpose of the invention is to solve the deficiencies of the prior art, and provide a purple-light cross-linked low-smoke, halogen-free, high flame-retardant EVA wire and cable and its preparation method.

Technical solution: In order to achieve the above object, the present invention adopts the following technical solutions:

A purple-light cross-linked low-smoke, halogen-free, high-flame-retardant EVA wire and cable includes a conductor, a shielding layer is provided outside the conductor, an ultraviolet cross-linking insulating layer is provided outside the shielding layer, and an ultraviolet cross-linking insulating layer is provided outside the ultraviolet cross-linking insulating layer. There is a ceramic silicone rubber layer, the ceramic silicone rubber layer is provided with an anti-corrosion layer, the conductor is filled with a flame-retardant glass fiber filling rope, and the entire conductor and the flame-retardant glass fiber filling rope are provided with a flame-retardant tape , the flame-retardant tape is provided with an inner ultraviolet cross-linking protective layer, the inner ultraviolet cross-linking protective layer is provided with an armor layer, the armored layer is provided with an outer ultraviolet cross-linking protective layer, and the outer ultraviolet cross-linking protective layer is A waterproof layer is arranged on the outside of the external protection layer, and an SBS rubber layer is arranged on the outside of the waterproof layer, and an anti-ultraviolet layer is coated on the outside of the SBS rubber layer; The UV cross-linking protective layer is a UV cross-linking flame-retardant EVA/HDPE composite resin layer, which is mainly composed of the following mass percentage materials:

EVA resin: 100 parts;

HDPE: 25-35 parts; the introduction of HDPE can significantly increase the tensile strength of the cable material;

POE: 8-10 parts; Polyolefin elastomer with excellent physical and mechanical properties (high elasticity, high strength, high elongation) and low temperature performance. Because its molecular chain is saturated, the skeleton contains relatively few tertiary carbon atoms, and it has strong heat aging resistance. The introduction of POE elastomer into the system can not only improve the mechanical properties of the cable material, but also improve the heat aging resistance;

Composite flame retardant Ⅰ: 40-45 parts;

Composite flame retardant II: 24-36 parts;

Polypropylene fiber: 4-6 parts; can improve the impact resistance and toughness of the product;

Impact modifier: 3-5 parts;

Plasticizer: 8-10 parts;

Stabilizer: 2-3 parts;

Phase flux: 5-10 parts;

Lubricant: 3.5-4.5 parts;

Coupling agent: 1.5-2.5 parts;

Smoke suppressant: 0.5-1 part;

Antiaging agent: 0.5-1 part;

Accelerator: 2-3 parts;

Calcium carbonate: 5-8 parts; it has flame retardant effect and improves the flame retardancy of the product; it can also act as a curing agent, which can increase the curing reaction speed and reduce the reaction time; at the same time, calcium carbonate itself is used as an inorganic filler , can also play a role in improving the wear resistance and mechanical strength of the product, and its price is low and non-toxic;

Sodium carboxymethyl cellulose: 1-2 parts; it has the functions of binding, thickening, strengthening and emulsifying;

Coloring agent: 0.5-1 part;

Antioxidant 1010: 0.1-0.2 parts;

Antioxidant DLTP: 0.1-0.2 parts. Compounded with antioxidant 1010, it has a good synergistic effect, significantly improves the thermal oxidation stability of the material, and makes the material have relatively excellent thermal aging resistance. The electric wire and cable of the present invention, the shielding layer that is provided with, concrete function is: the electric current that cable passes is bigger, and magnetic field will be produced around electric current, in order not to influence other components, so adding shielding layer can shield this electromagnetic field in the cable; It can play a certain protective role in the price of grounding wires and cables. If the cable core wire is damaged, the leaked current can flow along the shielding layer like a grounding grid, which plays a role of safety protection;

Equipped with ultraviolet cross-linking insulation layer, compared with ordinary insulation layer, the flame retardancy, anti-aging ability and electrical performance of wire and cable are superior;

There is a ceramic silicone rubber layer, which enhances the fire resistance of each individual conductor, so that the overall fire resistance of the wire and cable is enhanced, and its use safety is enhanced;

Equipped with an anti-corrosion layer to prevent cable corrosion and enhance the safety of use;

Flame-retardant glass fiber filled rope has good flame-retardant properties and improves the flame-retardant properties of wires and cables;

Flame-retardant tape, which guarantees the overall flame retardancy of wires and cables, including conductors and fillers, usually using halogen-free flame-retardant tapes sold on the market;

Inner ultraviolet cross-linking protective layer and outer ultraviolet cross-linking protective layer, double-layer protection, double-layer flame retardant, while further strengthening the protection of wires and cables, further enhance the flame retardancy and mechanical properties of wires and cables;

The UV cross-linking insulation layer, the inner UV cross-linking protective layer and the outer UV cross-linking protective layer all use EVA resin as the main component, supplemented with POE and HDPE, which further increases the impact resistance, mechanical properties, and chemical stability of the product. ;

The waterproof layer enhances the waterproofness of the wire and cable and prolongs its service life;

SBS rubber layer enhances the elasticity of the cable and enhances its impact resistance;

Anti-ultraviolet layer, enhance its anti-ultraviolet function, avoid aging due to ultraviolet radiation, and prolong its service life;

The multi-layer structure design makes the wire and cable of the present invention have excellent flame retardancy, impact resistance, high temperature resistance, corrosion resistance, UV protection, safety, etc., making the overall performance of the wire and cable far greater than that of ordinary wire and cable .

The impact modifier is methacrylate-butadiene-styrene copolymer; methacrylate-butadiene-styrene copolymer or MBS is a new type of polymer material, composed of methyl methacrylate Ester (M), butadiene (B) and styrene (S) are prepared by emulsion graft polymerization. The resin has a typical core-shell structure in submicroscopic morphology, the core is a rubber phase spherical core with a diameter of 10-100 nm, and the outer shell is composed of styrene and methyl methacrylate. The special structure of MBS endows the product with excellent impact resistance. When MBS resin is added in the present invention, the impact strength of the product can be increased by 4-15 times, and the cold resistance and processing fluidity of the product can also be improved at the same time, and the original physical and chemical properties of the main component PE can be maintained;

The plasticizer is dioctyl sebacate; it enhances the plasticizing effect of the wire and cable, enhances its flexibility, makes it easier to process, and is relatively cheap and non-toxic;

Described stabilizer is that stabilizer is the mixture of calcium-zinc composite stabilizer and pentaerythritol weight component ratio of 1:2; Adding stabilizer can make product property more stable, prevent its decomposition, aging, simultaneously calcium-zinc composite stabilizer compares Compared with some other metal lead stabilizers, it not only has a good stabilizing effect, but also is non-toxic and environmentally friendly. After mixing with pentaerythritol, its stabilizing effect can be further enhanced;

The phase fluxing agent is ethylene-vinyl acetate copolymer grafted maleic anhydride EVA-g-MAH; the phase fluxing agent can greatly improve the compatibility of materials and the dispersibility of fillers, thereby improving the mechanical properties and thermal properties of products that can be greatly enhanced. Performance, coloring ability, improve product processing performance, impact resistance, reduce water absorption, improve dimensional stability; facilitate the uniform dispersion of flame retardants in the matrix resin, reduce the agglomeration of inorganic flame retardants, that is, reduce the impact of external forces The stress concentration point when

The lubricant is a mixture of paraffin oil and paraffin wax with a weight component ratio of 1:2; both paraffin oil and paraffin are good lubricants, and are also a softening agent, which can reduce viscosity and facilitate material processing and production, so that not only It can improve the production efficiency of material processing, reduce production costs, and at the same time make the material's chemical resistance better. When the ratio of the two is 1:2, the effect is maximized;

The coupling agent is vinyl triperoxy tert-butyl silane; it can significantly improve the heat resistance, flame retardancy, solvent resistance, mechanical strength and electrical properties of the product;

The smoke suppressant is a mixture with a molar ratio of Sb ₂ O ₃ : MoO ₃ =1:1; it can eliminate or reduce the smoke and harmful gases generated during the combustion process of the material, adding an appropriate amount of smoke suppressant can greatly reduce the While reducing the amount of smoke in the combustion process, improve the flame retardancy and oxygen index of the material, and at the same time be environmentally friendly;

The anti-aging agent is anti-aging agent 264; preventing or inhibiting factors such as oxygen, heat, light, ozone, mechanical stress, heavy metal ions, etc. from destroying the performance of the product, prolonging the storage and service life of the product;

The accelerator is accelerator NS; it can accelerate the reaction speed, shorten the vulcanization time or lower the vulcanization temperature, reduce the amount of vulcanizing agent and improve the physical and mechanical properties of the product, etc. At the same time, the accelerator NS is an environmentally friendly and non-toxic substance;

The colorant is titanium dioxide or carbon black; titanium dioxide can not only be used as a white colorant, but also a good anti-ultraviolet agent. Adding titanium dioxide can make the material have a good coloring effect on the basis of coloring. Weather resistance; carbon black is a commonly used black pigment with low price, and it also has the effect of UV protection (anti-aging) on the product.

The composite flame retardant I is a composite of tricresyl phosphate TCP, hydrotalcite LDHs and aluminum hydroxide ATH. The compound flame retardant of tricresyl phosphate TCP, hydrotalcite LDHs and aluminum hydroxide ATH, compared with the single flame retardant among them, after being added to EVA material, not only the flame retardancy is more significant, but also It also greatly improves the mechanical properties of the product without affecting the physical properties such as weather resistance of the product itself;

The composite flame retardant II is a composite of expandable graphite, ammonium polyphosphate and pentaerythritol. Expandable graphite (EG) has good heat resistance and low thermal conductivity, but its flame retardant efficiency is low. The compound of ammonium polyphosphate and pentaerythritol can form a layer of uniform carbon foam on the surface while being flame retardant. Layer, this carbon layer can play the role of heat insulation, oxygen insulation, smoke suppression and anti-melt droplet in the condensed phase, and the three can be compounded to achieve flame retardancy, and also play a role in heat insulation, oxygen insulation, suppression The role of smoke and anti-drip.

The compounding ratio of tricresyl phosphate TCP, hydrotalcite LDHs and aluminum hydroxide ATH in the composite flame retardant I is 1: (1.5-1.75): (1.5-1.75); The improvement in flame retardancy and mechanical properties is the most significant;

The compounding ratio of expandable graphite, ammonium polyphosphate and pentaerythritol in the composite flame retardant II is 1:4:1 in parts by mass; And anti-droplet effect is the most significant.

The thickness of the ultraviolet crosslinking insulating layer is 1.2-2.4mm.

The ceramic silicon rubber layer is a ceramic silicon rubber layer, and the thickness of the ceramic silicon rubber layer is 1.5-2.5 mm; the ceramic silicon rubber layer has superior fire resistance and is environmentally friendly; the anti-corrosion layer is a polytetrafluoroethylene layer, The thickness of the anti-corrosion layer is 0.5-0.8mm. Polytetrafluoroethylene layer has strong impermeability, high tensile strength, good low temperature flexibility, small linear expansion coefficient, easy bonding, large friction coefficient, good stability, non-toxic, strong deformation adaptability, and wide temperature range , long service life and other good comprehensive technical performance.

The thickness of the inner ultraviolet crosslinking protective layer is 1.1-2mm; the thickness of the ultraviolet crosslinking protective layer is 2.5-3.5mm.

The waterproof layer is a polytetrafluoroethylene layer, and the thickness of the waterproof layer is 0.8-1mm; polytetrafluoroethylene has high corrosion resistance and water resistance, very stable chemical properties, and can withstand boiling hydrochloric acid, sulfuric acid, nitric acid and acetic acid. Water is also resistant to various concentrated alkalis and organic solvents, the applicable temperature is -200°C-260°C, and the decomposition temperature is 415°C;

The thickness of the SBS rubber layer is 0.5-0.8mm. S stands for styrene, B stands for butadiene, and SBS is styrene-butadiene rubber in the form of a block copolymer produced by free radical polymerization. The two ends of the polymer are styrene polymer segments, and the middle is a butadiene polymer segment, forming an ABA type tri-block copolymer. SBS rubber usually refers to SBS after hydrogenation treatment of SBS. The double bond in the polybutadiene block is eliminated through hydrogenation treatment, so that SBS rubber has good oxidation resistance; at the same time, SBS has excellent elasticity.

The anti-ultraviolet layer is a nano-titanium dioxide composite acrylate coating layer, the nano-titanium dioxide composite acrylate coating layer includes nano-titanium dioxide with a mass fraction of 5.5-6%, and the rest is acrylate, and the thickness of the anti-ultraviolet layer is 20-25 μm . With this coating, 99% of ultraviolet rays can be shielded, preventing the aging of wires and cables and prolonging their service life.

The number of the conductors is at least 2, and the conductors and their outer covering shielding layer), ultraviolet cross-linking insulating layer, ceramic silicon rubber layer, and anti-corrosion layer form a whole, which are symmetrically distributed in the flame-retardant belt .

A method for preparing purple light crosslinked low-smoke, halogen-free and highly flame-retardant EVA wire and cable, mainly including the preparation of cable materials for an ultraviolet crosslinking insulating layer, an inner ultraviolet crosslinking protective layer, and an outer ultraviolet crosslinking protective layer. The cable materials used for the three layers are Consistent, the specific preparation method is as follows:

Dosing according to the formula, put the prepared materials into the double-roll mill for melt blending, the mixing temperature is 140-150°C, and the mixing time is 8-15 minutes. After the blending is uniform, the next piece is cut and then transferred to Tablet molding on a flat vulcanizing machine, the molding temperature is 165-175°C, the time is 10 minutes, the pressure is 15MPa, and then cooled for 3-5 minutes, and then the sheet is released. After the sheet is released, it is irradiated with ultraviolet light at 3KV , irradiated and cross-linked at 125°C, the required UV cross-linking insulation layer, inner UV cross-linking protective layer and UV cross-linking protective layer cable material can be prepared. Strictly control the molding temperature. If the temperature is too high, the product will decompose, resulting in a rough surface and a large number of pores. If the temperature is too low, the product will not be completely plasticized and difficult to form. Only at this temperature can the surface quality of the product be guaranteed.

Beneficial effects: Compared with the prior art, the purple light cross-linked low-smoke, halogen-free and highly flame-retardant EVA wire and cable and its preparation method have the following advantages:

1. The wire and cable of the present invention is provided with an ultraviolet crosslinking insulating layer, a ceramic silicon rubber layer, a flame-retardant glass fiber filling rope, an inner ultraviolet crosslinking protective layer, and an outer ultraviolet crosslinking protective layer. Multiple settings make the product Flame retardancy, mechanical properties, and aging resistance are far superior to similar products; at the same time, the material of the flame-retardant layer is halogen-free, making the present invention a purple-light cross-linked low-smoke, halogen-free, high-flame-retardant EVA wire and cable;

2. The wire and cable of the present invention is also provided with a shielding layer, an anti-corrosion layer, a waterproof layer, an SBS rubber layer, and an anti-ultraviolet layer, so that the product has excellent shielding effect, stable signal transmission, and has excellent waterproof and corrosion resistance. Heat resistance, weather resistance and UV resistance, etc., is a wire and cable with superior comprehensive performance;

3, electric wire and cable of the present invention, insulating layer, inner ultraviolet crosslinking protective layer, outer ultraviolet crosslinking protective layer, all adopt EVA as main raw material, while improving the flame retardancy of product, also utilize the character of EVA itself, thereby further Increase the impact resistance of the product, mechanical properties, chemical stability, etc. of the wire and cable of the present invention;

4. The wire and cable of the present invention, the insulation layer, the inner ultraviolet crosslinking protective layer, and the outer ultraviolet crosslinking protective layer adopt EVA as the main raw material, add POE and HDPE, and add other auxiliary agents at the same time, such as plasticizers, Stabilizers, lubricants, etc., make the insulation, physical and mechanical properties, elasticity, aging resistance, corrosion resistance, flame retardancy and other aspects of the wire and cable material itself more perfect and excellent compared with peers;

5. The wire and cable of the present invention, the insulation layer, the inner ultraviolet crosslinking protective layer, and the outer ultraviolet crosslinking protective layer adopt EVA resin as the main material, and simultaneously add tricresyl phosphate TCP, hydrotalcite LDHs and aluminum hydroxide ATH Composite flame retardant I, on the basis of ensuring that the performance of the original EVA resin is not affected, greatly enhances the flame retardancy and mechanical properties of the product; at the same time, a composite flame retardant of expandable graphite, ammonium polyphosphate and pentaerythritol is also added Ⅱ, making the product further enhance the heat resistance, heat insulation, oxygen insulation, smoke suppression and droplet resistance while enhancing the flame retardancy;

6. The coloring agent selected for the wire and cable of the present invention also has the effect of ultraviolet protection (anti-aging) on the product;

7. The wire and cable of the present invention are all environmentally friendly materials from the main material EVA used to other auxiliary reagents, so that the final wire and cable material is better in environmental protection;

8. The wire and cable of the present invention is easy to prepare, and the materials used are environmentally friendly, and it is an environmentally friendly high-performance wire and cable;

9. The wire and cable of the present invention, the preparation method, strictly control the production conditions, so that the quality of the product is higher, and the preparation method is simple and easy to implement, and is suitable for large-scale industrial production;

10. The wire and cable of the present invention adopts ultraviolet cross-linking technology. Compared with beam irradiation cross-linking, the present invention has the advantages of small investment, no special workshop, strong adaptability, simple process, and easy maintenance of equipment.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the present invention;

In the figure: 1-conductor, 2-shielding layer, 3-ultraviolet cross-linking insulation layer, 4-ceramic silicone rubber layer, 5-anti-corrosion layer, 6-flame retardant glass fiber filled rope, 7-flame retardant tape, 8- Inner ultraviolet cross-linking protective layer, 9-armouring layer, 10-outer ultraviolet cross-linking protective layer, 11-waterproof layer, 12-SBS rubber layer, 13-ultraviolet protection layer.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments, but at the same time it is explained that the protection scope of the present invention is not limited to the specific scope of this embodiment. All other embodiments obtained below all belong to the protection scope of the present invention.

Example 1

A purple-light cross-linked low-smoke, halogen-free, high-flame-retardant EVA wire and cable includes three conductors 1, a shielding layer 2 is provided outside the conductor 1, and an ultraviolet cross-linking insulating layer 3 is provided outside the shielding layer 2. A ceramic silicon rubber layer 4 is arranged on the outside of the ultraviolet cross-linking insulating layer 3, and the ceramic silicon rubber layer 4 is a ceramic silicon rubber layer, and an anti-corrosion layer 5 is arranged on the outside of the ceramic silicon rubber layer 4, and the anti-corrosion layer 5 is Polytetrafluoroethylene layer, the conductor 1 is filled with flame-retardant glass fiber filling rope 6, the entire conductor 1 and the flame-retardant glass fiber filling rope 6 are provided with a flame-retardant tape 7 outside, and the conductor 1 and its outer wrapping The covered shielding layer 2, ultraviolet cross-linking insulating layer 3, ceramic silicon rubber layer 4, and anti-corrosion layer 5 form a whole, which are symmetrically distributed in the flame-retardant belt 7, and the flame-retardant belt 7 is provided with inner purple Outer linking protective layer 8, described inner ultraviolet crosslinking protective layer 8 is provided with armoring layer 9 outside, and described armoring layer 9 is provided with outer ultraviolet crosslinking protective layer 10, and described ultraviolet crosslinking protective layer 10 is external A waterproof layer 11 is provided, and the waterproof layer 11 is a polytetrafluoroethylene layer. The outside of the waterproof layer 11 is provided with an SBS rubber layer 12, and the outside of the SBS rubber layer 12 is coated with an anti-ultraviolet layer 13. The anti-ultraviolet layer Layer 13 is a nano-titanium dioxide composite acrylate coating layer, the nano-titanium dioxide composite acrylate coating layer includes nano-titanium dioxide with a mass fraction of 5.5%, and the rest is acrylate; the ultraviolet crosslinking insulating layer 3 and the inner ultraviolet crosslinking protective layer 8 Both UV crosslinking and UV crosslinking protective layer 10 are UV crosslinking flame retardant EVA/HDPE composite resin layers, and are mainly composed of the following materials in mass percentage:

EVA resin: 100 parts;

HDPE: 25 parts;

POE: 8 copies;

Composite flame retardant Ⅰ: tricresyl phosphate: 10 parts; hydrotalcite: 15 parts; aluminum hydroxide: 15 parts;

Composite flame retardant II: expandable graphite: 4 parts; ammonium polyphosphate: 16 parts; pentaerythritol: 4 parts;

Polypropylene fiber: 4 parts;

Impact modifier: methacrylate-butadiene-styrene copolymer: 3 parts;

Plasticizer: dioctyl sebacate: 8 parts;

Stabilizer: a mixture of calcium-zinc composite stabilizer and pentaerythritol with a ratio of 1:2 by weight: 2 parts;

Phase flux: ethylene-vinyl acetate copolymer grafted maleic anhydride EVA-g-MAH: 5 parts;

Lubricant: a mixture of paraffin oil and paraffin wax with a ratio of 1:2 by weight: 3.5 parts;

Coupling agent: vinyl triperoxy tert-butylsilane: 1.5 parts;

Smoke suppressant: a mixture with a molar ratio of Sb2O3:MoO3=1:1: 0.5 parts;

Anti-aging agent: anti-aging agent 264: 0.5 parts;

Accelerator: Accelerator NS: 2 parts;

Calcium carbonate: 5 parts;

Sodium carboxymethyl cellulose: 1 part;

Coloring agent: titanium dioxide or carbon black: 0.5 parts;

Antioxidant 1010: 0.1 parts;

Antioxidant DLTP: 0.1 part.

The thickness of the ultraviolet crosslinking insulating layer 3 is 1.2mm.

The thickness of the ceramic silicone rubber layer 4 is 1.5mm.

The thickness of the anticorrosion layer 5 is 0.5mm.

The thickness of the inner ultraviolet cross-linking protection layer 8 is 1.1mm.

The thickness of the ultraviolet crosslinking protective layer 10 is 2.5 mm.

The thickness of the waterproof layer 11 is 0.8mm.

The thickness of described SBS rubber layer 12 is 0.5mm.

The thickness of the UV protection layer 13 is 20 μm.

A preparation method of purple cross-linked low-smoke, halogen-free and highly flame-retardant EVA wire and cable, mainly comprising cable material preparation of ultraviolet cross-linking insulating layer 3, inner ultraviolet cross-linking protective layer 8 and outer ultraviolet cross-linking protective layer 10, three layers The cable materials used are the same, and the specific preparation method is as follows:

Dosing according to the formula, put the prepared materials into the double-roll mill for melting and blending, the mixing temperature is 140°C, and the mixing time is 8 minutes. After the blending is uniform, the next piece is cut, and then transferred to the flat vulcanizing machine for pressing Sheet molding, the molding temperature is 165°C, the time is 10 minutes, the pressure is 15MPa, and then cooled for 3-5 minutes, and then the sheet is released. After the sheet is released, it is irradiated by ultraviolet light irradiation equipment at 3KV light and 125°C The required cable material of the ultraviolet crosslinking insulating layer 3 , the inner ultraviolet crosslinking protective layer 8 and the outer ultraviolet crosslinking protective layer 10 can be obtained by crosslinking.

Example 2

A purple-light cross-linked low-smoke, halogen-free, high-flame-retardant EVA wire and cable includes three conductors 1, a shielding layer 2 is provided outside the conductor 1, and an ultraviolet cross-linking insulating layer 3 is provided outside the shielding layer 2. A ceramic silicon rubber layer 4 is arranged on the outside of the ultraviolet cross-linking insulating layer 3, and the ceramic silicon rubber layer 4 is a ceramic silicon rubber layer, and an anti-corrosion layer 5 is arranged on the outside of the ceramic silicon rubber layer 4, and the anti-corrosion layer 5 is Polytetrafluoroethylene layer, the conductor 1 is filled with flame-retardant glass fiber filling rope 6, the entire conductor 1 and the flame-retardant glass fiber filling rope 6 are provided with a flame-retardant tape 7 outside, and the conductor 1 and its outer wrapping The covered shielding layer 2, ultraviolet cross-linking insulating layer 3, ceramic silicon rubber layer 4, and anti-corrosion layer 5 form a whole, which are symmetrically distributed in the flame-retardant belt 7, and the flame-retardant belt 7 is provided with inner purple Outer linking protective layer 8, described inner ultraviolet crosslinking protective layer 8 is provided with armoring layer 9 outside, and described armoring layer 9 is provided with outer ultraviolet crosslinking protective layer 10, and described ultraviolet crosslinking protective layer 10 is external A waterproof layer 11 is provided, and the waterproof layer 11 is a polytetrafluoroethylene layer. The outside of the waterproof layer 11 is provided with an SBS rubber layer 12, and the outside of the SBS rubber layer 12 is coated with an anti-ultraviolet layer 13. The anti-ultraviolet layer Layer 13 is a nano-titanium dioxide composite acrylate coating layer, the nano-titanium dioxide composite acrylate coating layer includes nano-titanium dioxide with a mass fraction of 5.8%, and the rest is acrylate; the ultraviolet crosslinking insulating layer 3 and the inner ultraviolet crosslinking protective layer 8 Both UV crosslinking and UV crosslinking protection layer 10 are UV crosslinking flame retardant EVA/HDPE composite resin layers, and are mainly composed of the following materials in mass percentage:

EVA resin: 100 parts;

HDPE: 30 parts;

POE: 9 copies;

Composite flame retardant Ⅰ: tricresyl phosphate: 10 parts; hydrotalcite: 16 parts; aluminum hydroxide: 16 parts;

Composite flame retardant II: expandable graphite: 5 parts; ammonium polyphosphate: 20 parts; pentaerythritol: 5 parts;

Polypropylene fiber: 5 parts;

Impact modifier: methacrylate-butadiene-styrene copolymer: 4 parts;

Plasticizer: dioctyl sebacate: 9 parts;

Stabilizer: a mixture of calcium-zinc composite stabilizer and pentaerythritol with a ratio of 1:2 by weight: 2.5 parts;

Phase flux: ethylene-vinyl acetate copolymer grafted maleic anhydride EVA-g-MAH: 7.5 parts;

Lubricant: a mixture of paraffin oil and paraffin wax with a weight component ratio of 1:2: 4 parts;

Coupling agent: vinyl triperoxy tert-butylsilane: 2 parts;

Smoke suppressant: a mixture with a molar ratio of Sb2O3:MoO3=1:1: 0.8 parts;

Anti-aging agent: anti-aging agent 264: 0.8 parts;

Accelerator: Accelerator NS: 2.5 parts;

Calcium carbonate: 6.5 parts;

Sodium carboxymethyl cellulose: 1.5 parts;

Coloring agent: titanium dioxide or carbon black: 0.8 parts;

Antioxidant 1010: 0.15 parts;

Antioxidant DLTP: 0.15 parts.

the

The thickness of the ultraviolet crosslinking insulation layer 3 is 1.8mm.

The thickness of the ceramic silicon rubber layer 4 is 2mm.

The thickness of the anticorrosion layer 5 is 0.7mm.

The thickness of the inner ultraviolet cross-linking protection layer 8 is 1.6 mm.

The thickness of the ultraviolet crosslinking protective layer 10 is 3mm.

The thickness of the waterproof layer 11 is 0.9mm.

The thickness of described SBS rubber layer 12 is 0.7mm.

The thickness of the UV protection layer 13 is 23 μm.

A preparation method of purple cross-linked low-smoke, halogen-free and highly flame-retardant EVA wire and cable, mainly comprising cable material preparation of ultraviolet cross-linking insulating layer 3, inner ultraviolet cross-linking protective layer 8 and outer ultraviolet cross-linking protective layer 10, three layers The cable materials used are the same, and the specific preparation method is as follows:

Dosing according to the formula, put the prepared materials into the double-roll mill for melting and blending, the mixing temperature is 145°C, and the mixing time is 12 minutes. After the blending is uniform, the next piece is cut, and then transferred to the flat vulcanizing machine for pressing Sheet molding, the molding temperature is 170°C, the time is 10 minutes, the pressure is 15MPa, and then cooled for 3-5 minutes, and then the sheet is released. After the sheet is released, it is irradiated by ultraviolet light irradiation equipment at 3KV light and 125°C The required cable material of the ultraviolet crosslinking insulating layer 3 , the inner ultraviolet crosslinking protective layer 8 and the outer ultraviolet crosslinking protective layer 10 can be obtained by crosslinking.

Example 3

A purple-light cross-linked low-smoke, halogen-free, high-flame-retardant EVA wire and cable includes three conductors 1, a shielding layer 2 is provided outside the conductor 1, and an ultraviolet cross-linking insulating layer 3 is provided outside the shielding layer 2. A ceramic silicon rubber layer 4 is arranged on the outside of the ultraviolet cross-linking insulating layer 3, and the ceramic silicon rubber layer 4 is a ceramic silicon rubber layer, and an anti-corrosion layer 5 is arranged on the outside of the ceramic silicon rubber layer 4, and the anti-corrosion layer 5 is Polytetrafluoroethylene layer, the conductor 1 is filled with flame-retardant glass fiber filling rope 6, the entire conductor 1 and the flame-retardant glass fiber filling rope 6 are provided with a flame-retardant tape 7 outside, and the conductor 1 and its outer wrapping The covered shielding layer 2, ultraviolet cross-linking insulating layer 3, ceramic silicon rubber layer 4, and anti-corrosion layer 5 form a whole, which are symmetrically distributed in the flame-retardant belt 7, and the flame-retardant belt 7 is provided with inner purple Outer linking protective layer 8, described inner ultraviolet crosslinking protective layer 8 is provided with armoring layer 9 outside, and described armoring layer 9 is provided with outer ultraviolet crosslinking protective layer 10, and described ultraviolet crosslinking protective layer 10 is external A waterproof layer 11 is provided, and the waterproof layer 11 is a polytetrafluoroethylene layer. The outside of the waterproof layer 11 is provided with an SBS rubber layer 12, and the outside of the SBS rubber layer 12 is coated with an anti-ultraviolet layer 13. The anti-ultraviolet layer Layer 13 is a nano-titanium dioxide composite acrylate coating layer, the nano-titanium dioxide composite acrylate coating layer includes nano-titanium dioxide with a mass fraction of 6%, and the rest is acrylate; the ultraviolet crosslinking insulating layer 3 and the inner ultraviolet crosslinking protective layer 8 Both UV crosslinking and UV crosslinking protective layer 10 are UV crosslinking flame retardant EVA/HDPE composite resin layers, and are mainly composed of the following materials in mass percentage:

EVA resin: 100 parts;

HDPE: 33 parts;

POE: 10 copies;

Composite flame retardant Ⅰ: tricresyl phosphate: 10 parts; hydrotalcite: 17.5 parts; aluminum hydroxide: 17.5 parts;

Composite flame retardant II: expandable graphite: 6 parts; ammonium polyphosphate: 24 parts; pentaerythritol: 6 parts;

Polypropylene fiber: 6 parts;

Impact modifier: methacrylate-butadiene-styrene copolymer: 5 parts;

Plasticizer: dioctyl sebacate: 10 parts;

Stabilizer: a mixture of calcium-zinc composite stabilizer and pentaerythritol with a ratio of 1:2 by weight: 3 parts;

Phase flux: ethylene-vinyl acetate copolymer grafted maleic anhydride EVA-g-MAH: 10 parts;

Lubricant: a mixture of paraffin oil and paraffin wax with a ratio of 1:2 by weight: 4.5 parts;

Coupling agent: vinyl triperoxy tert-butylsilane: 2.5 parts;

Smoke suppressant: a mixture with a molar ratio of Sb2O3:MoO3=1:1: 1 part;

Anti-aging agent: anti-aging agent 264: 1 part;

Accelerator: Accelerator NS: 3 parts;

Calcium carbonate: 8 parts;

Sodium carboxymethyl cellulose: 2 parts;

Coloring agent: titanium dioxide or carbon black: 1 part;

Antioxidant 1010: 0.2 parts;

Antioxidant DLTP: 0.2 parts.

The thickness of the ultraviolet crosslinking insulation layer 3 is 2.4mm.

The thickness of the ceramic silicone rubber layer 4 is 2.5mm.

The thickness of the anticorrosion layer 5 is 0.8mm.

The thickness of the inner ultraviolet cross-linking protection layer 8 is 2mm.

The thickness of the ultraviolet crosslinking protective layer 10 is 3.5mm.

The thickness of the waterproof layer 11 is 1mm.

The thickness of described SBS rubber layer 12 is 0.8mm.

The thickness of the UV protection layer 13 is 25 μm.

A preparation method of purple cross-linked low-smoke, halogen-free and highly flame-retardant EVA wire and cable, mainly comprising cable material preparation of ultraviolet cross-linking insulating layer 3, inner ultraviolet cross-linking protective layer 8 and outer ultraviolet cross-linking protective layer 10, three layers The cable materials used are the same, and the specific preparation method is as follows:

Dosing according to the formula, put the prepared materials into the double-roll mill for melting and blending, the mixing temperature is 150°C, and the mixing time is 15 minutes. After the blending is uniform, the next piece is cut, and then transferred to the flat vulcanizing machine for pressing Sheet molding, the molding temperature is 175°C, the time is 10 minutes, the pressure is 15MPa, and then cooled for 3-5 minutes, and then the sheet is released. After the sheet is released, it is irradiated by ultraviolet light irradiation equipment at 3KV light and 125°C The required cable material of the ultraviolet crosslinking insulating layer 3 , the inner ultraviolet crosslinking protective layer 8 and the outer ultraviolet crosslinking protective layer 10 can be obtained by crosslinking.

Claims (10)

1. a purple light cross-linking low-smoke halogen-free high flame retardant EVA electric wire, it is characterized in that: comprise conductor (1), described conductor (1) outside is provided with screen (2), described screen (2) outside is provided with UV-crosslinked insulating barrier (3), described UV-crosslinked insulating barrier (3) outside is provided with ceramic silicon rubber layer (4), described ceramic silicon rubber layer (4) outside is provided with corrosion-resistant coating (5), between described conductor (1), be filled with flame-retarding glass fiber filler yarn (6), described whole conductor (1) and flame-retarding glass fiber filler yarn (6) outside are provided with inhibiting tape (7), described inhibiting tape (7) outside is provided with interior UV-crosslinked protective layer (8), described interior UV-crosslinked protective layer (8) outside is provided with armour (9), described armour (9) outside is provided with outer UV-crosslinked protective layer (10), described outer UV-crosslinked protective layer (10) outside is provided with watertight composition (11), described watertight composition (11) outside is provided with SBS rubber layer (12), described SBS rubber layer (12) outside is coated with ultraviolet resistant layer (13), described UV-crosslinked insulating barrier (3), interior UV-crosslinked protective layer (8) and outer UV-crosslinked protective layer (10) are all UV-crosslinked fire-retardant EVA/ HDPE compound resin layers, and all the main material by following mass percent forms:

EVA resin: 100 parts;

HDPE:25-35 part;

POE:8-10 part;

Composite flame-retardant agent I: 40-45 part;

Composite flame-retardant agent II: 24-36 part;

Polypropylene fibre: 4-6 part;

Anti-impact modifier: 3-5 part;

Plasticizer: 8-10 part;

Stabilizer: 2-3 part;

Phase flux: 5-10 part;

Lubricant: 3.5-4.5 part;

Coupling agent: 1.5-2.5 part;

Antismoke agent: 0.5-1 part;

Age resistor: 0.5-1 part;

Promoter: 2-3 part;

Calcium carbonate: 5-8 part;

Sodium carboxymethylcellulose: 1-2 part;

Colouring agent: 0.5-1 part;

Antioxidant 1010: 0.1-0.2 part;

Anti-oxidant DLTP: 0.1-0.2 part.

2. purple light cross-linking low-smoke halogen-free high flame retardant EVA electric wire according to claim 1, is characterized in that: described anti-impact modifier is methacrylate-butadiene one styrol copolymer; Described plasticizer is di-n-octyl sebacate; Described stabilizer is that stabilizer is the mixture that calcium-zinc composite stabilizing agent and pentaerythrite composition by weight ratio are 1:2; Described phase flux is ethene-acetate ethylene copolymer grafted maleic anhydride EVA-g-MAH; Described lubricant is the mixture that paraffin oil and paraffin composition by weight ratio are 1:2; Described coupling agent is vinyl three tert-butyl peroxide silane; Described antismoke agent is that mol ratio is the mixture of Sb2O3:MoO3=1:1; Described age resistor is antioxidant 264; Described promoter is accelerator NS; Described colouring agent is titanium dioxide or carbon black; Described composite flame-retardant agent I is the compound of tricresyl phosphate TCP, hydrotalcite LDHs and aluminium hydroxide ATH, and described composite flame-retardant agent II is the compound of expansible graphite, APP and pentaerythrite.

3. purple light cross-linking low-smoke halogen-free high flame retardant EVA electric wire according to claim 2, is characterized in that: in described composite flame-retardant agent I, tricresyl phosphate TCP, hydrotalcite LDHs and aluminium hydroxide ATH are 1:(1.5-1.75 by the composite ratio of mass fraction): (1.5-1.75); In described composite flame-retardant agent II, expansible graphite, APP and pentaerythrite are 1:4:1 by the composite ratio of mass fraction.

4. purple light cross-linking low-smoke halogen-free high flame retardant EVA electric wire according to claim 1, is characterized in that: the thickness of described UV-crosslinked insulating barrier (3) is 1.2-2.4mm.

5. purple light cross-linking low-smoke halogen-free high flame retardant EVA electric wire according to claim 1, is characterized in that: the thickness of described ceramic silicon rubber layer (4) is 1.5-2.5mm; Described corrosion-resistant coating (5) is polytetrafluoroethylene floor, and the thickness of described corrosion-resistant coating (5) is 0.5-0.8mm.

6. purple light cross-linking low-smoke halogen-free high flame retardant EVA electric wire according to claim 1, is characterized in that: the thickness of described interior UV-crosslinked protective layer (8) is 1.1-2mm; The thickness of described outer UV-crosslinked protective layer (10) is 2.5-3.5mm.

7. purple light cross-linking low-smoke halogen-free high flame retardant EVA electric wire according to claim 1, is characterized in that: described watertight composition (11) is polytetrafluoroethylene floor, and the thickness of described watertight composition (11) is 0.8-1mm; The thickness of described SBS rubber layer (12) is 0.5-0.8mm.

8. purple light cross-linking low-smoke halogen-free high flame retardant EVA electric wire according to claim 1, it is characterized in that: described ultraviolet resistant layer (13) is nano titanium oxide compound acrylic ester dope layer, described nano titanium oxide compound acrylic ester dope layer comprises the nano titanium oxide of mass fraction 5.5-6%, all the other are acrylate, and the thickness of described ultraviolet resistant layer (13) is 20-25 μ m.

9. purple light cross-linking low-smoke halogen-free high flame retardant EVA electric wire according to claim 1, it is characterized in that: the quantity of described conductor (1) has 2 at least, described conductor (1) forms an integral body with its outside coated screen (2), UV-crosslinked insulating barrier (3), ceramic silicon rubber layer (4), corrosion-resistant coating (5), and symmetrical is distributed in described inhibiting tape (7).

10. the preparation method of a purple light cross-linking low-smoke halogen-free high flame retardant EVA electric wire as claimed in claim 1; it is characterized in that: mainly comprise the CABLE MATERIALS preparation of UV-crosslinked insulating barrier (3), interior UV-crosslinked protective layer (8) and outer UV-crosslinked protective layer (10); three layers of CABLE MATERIALS used are consistent, and concrete preparation method is as follows:

By described formula, prepare burden, the material preparing adds melt blending in two roller mills, mixing temperature is 140-150 ℃, incorporation time is 8-15 minute, after blend evenly, cut out for lower, then transfer to compression molding on vulcanizing press, forming temperature is 165-175 ℃, time is 10 minutes, pressure is 15MPa, and then cooling 3-5 minute, then slice, after slice, pass through again ultraviolet light irradiation instrument at 3KV light, at 125 ℃, cross-linking radiation can make needed UV-crosslinked insulating barrier (3), the CABLE MATERIALS of interior UV-crosslinked protective layer (8) and outer UV-crosslinked protective layer (10).