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Ultraviolet-light deeply cross-linked halogen-free flame-retardant polyolefin cable material and method for preparing ultraviolet-light deeply cross-linked halogen-free flame-retardant polyolefin cable insulating or sheathing layer from same

A cable insulation, ultraviolet light technology, applied in plastic/resin/wax insulators, insulated conductors, insulated cables, etc., can solve the problems of poor deep penetration ability, deterioration of material mechanics and processing performance, etc., to improve mechanical properties, product Low cost and the effect of improving flame retardant performance

Active Publication Date: 2011-08-17
HEILONGJIANG MINGXIANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcoming that exists in the prior art of above-mentioned photocrosslinking, the contriver discovers the novel photoinitiating system that cationic photoinitiator and free radical photoinitiator combine by surprise in long-term electric wire and cable development research and production practice At light intensity 400-4000mW / cm 2 , the wavelength of 200-500nm and its emission spectrum intensity distribution are matched with the cationic photoinitiator absorption spectrum and intensity distribution under the condition of a specific ultraviolet light source to carry out online continuous ultraviolet irradiation in the molten state to obtain a significant effect of deep crosslinking, and at the same time without In the formulation system of halogen flame retardant materials, various comprehensive technical means such as graft modified polyolefin resin, surface modified sub-nanometer or nano-scale metal hydroxide, flame retardant synergist and smoke suppressant are used to solve the problem of ultraviolet radiation. For key technical problems such as poor deep penetration ability and severe degradation of material mechanics and processing properties in large-scale halogen-free flame-retardant materials, develop and provide a cross-linking equipment with low investment, simple process, energy saving and environmental protection, and high production efficiency. High, low product cost, good quality, can achieve deep and uniform UV cross-linking UV deep cross-linking halogen-free flame retardant (referring to low-smoke, halogen-free, phosphorus-free flame retardant) polyolefin cable material (referring to insulation or sheathing material) and The preparation method of its insulating layer or sheath layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take by weight 80 parts of EVA (VA content 18wt%), 10 parts of glycidyl methacrylate grafted polyethylene, 10 parts of maleic anhydride grafted polyethylene, 150 parts of magnesium hydroxide, 4,4'- 2.5 parts of dimethyl diphenyliodonium phosphate, 0.5 parts of 4-chlorobenzophenone, 1.5 parts of TMPTA, 0.3 parts of antioxidant 300, 0.15 parts of TPP, 2 parts of zinc borate, 10 parts of molybdenum trioxide, 3 parts of hydroxy silicone oil; each raw material component is mixed uniformly, extruded and granulated at 160°C; then melted and extruded on the conductive core of the cable to coat the retardant to form a 3.0mm insulating layer or sheath layer, and then in In the ultraviolet radiation crosslinking equipment using H-type microwave-excited electrodeless lamp as the light source, the insulating layer or the sheath layer is subjected to online continuous ultraviolet radiation crosslinking in the molten state, and the crosslinking time is 5 seconds. The experimental resu...

Embodiment 2

[0029]Take by weight 60 parts of EVA (VA content 28wt%), 20 parts of low-density polyethylene, 10 parts of glycidyl methacrylate grafted EVA, 10 parts of maleic anhydride grafted EVA, superfine grade magnesium hydroxide 130 parts, 3.5 parts of triarylsulfonium hexafluorophosphate, 1.2 parts of 4',4'-dichlorobenzophenone, 3 parts of TAIC, 0.2 parts of antioxidant 1010, 0.1 parts of DLTP, 10 parts of silicon dioxide, 8 parts of ammonium heptamolybdate, 2 parts of sodium stearate; each raw material component is mixed uniformly and then extruded and granulated at 170°C, and then melted and extruded on the conductive core of the cable to coat the flame retardant into a 2.4mm insulation layer or sheath layer, and then in the ultraviolet radiation cross-linking equipment with H-type microwave excitation electrodeless lamp as the light source, the insulating layer or sheath layer is continuously cross-linked by ultraviolet radiation in the molten state, and the cross-linking time is f...

Embodiment 3

[0031] Take by weight 80 parts of LLDPE, 15 parts of maleic anhydride grafted polyethylene, 5 parts of glycidyl methacrylate grafted polyethylene, 125 parts of nano-layered double hydroxide, ferrocene-4-fluorine 2.0 parts of borate, 1.5 parts of 4-chlorobenzophenone, 5 parts of TAIC, 0.3 parts of antioxidant 1010, 0.7 parts of DTDTP, 5 parts of fumed silica, 5 parts of ammonium octamolybdate, 1.5 parts of zinc stearate Parts; each raw material component is mixed uniformly and extruded at 158 ​​℃ to granulate, and then melted and extruded on the conductive core of the cable to coat the retardant material into a 1.5mm insulating layer or sheath layer, and then excited by V-shaped microwave In the ultraviolet irradiation crosslinking equipment with electrodeless lamp as the light source, the insulating layer or the sheath layer is subjected to online continuous ultraviolet irradiation crosslinking in the molten state, and the crosslinking time is 0.5 seconds. The experimental res...

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Abstract

The invention relates to ultraviolet-light deeply cross-linked halogen-free flame-retardant polyolefin cable material and a method for preparing an ultraviolet-light deeply cross-linked halogen-free flame-retardant polyolefin cable insulating or sheathing layer from the same. The method comprises the following steps: adding a metal hydroxide flame retardant, a cationic photoinitiator, a free radical photoinitiator, a multi-functional cross-linking agent, a compound antioxidant, a flame-retardant synergist, a synergistic smoke suppressant and a processing aid to polyethylene or grafted and modified polyethylene and / or ethylene vinyl acetate or grafted and modified copolymer thereof which are used as base materials, compounding, mixing the materials uniformly according to the proportion, granulating, extruding to prepare the ultraviolet-light cross-linked halogen-free flame-retardant polyolefin cable insulating or sheathing layer, and immediately irradiating with a specific ultraviolet-light source to obtain the deeply cross-linked halogen-free flame-retardant polyolefin cable insulating or sheathing layer. The cross-linking equipment used for preparing the novel material by using anovel technology has low investment, and the process is simple and environmental friendly, saves energy, ensures high production efficiency and low cost and good quality of product and can be widely used for producing high-performance special wire and cable products and the like.

Description

technical field [0001] The invention belongs to the technical field of cross-linked flame-retardant polyolefin wire and cable, in particular to the preparation of ultraviolet light deep cross-linked halogen-free flame-retardant polyolefin cable material (referring to cable insulation material or sheath material) and its insulating layer or sheath layer method. Background technique [0002] Cross-linked polyolefin materials have the characteristics of excellent electrical properties, high long-term use temperature, corrosion resistance, good pressure and heat resistance, and high mechanical strength. They are increasingly used in the manufacture of insulation and sheath materials for cross-linked wires and cables. However, the main disadvantage of cross-linked polyolefin materials is that they are easy to catch fire and cause fires. At present, the most commonly used halogen-containing flame-retardant polyolefin materials will release a large amount of smoke and corrosive hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/08C08L51/06C08K3/22C08K3/26C08K3/28C08J3/24C08J3/28H01B7/295H01B3/44
Inventor 瞿保钧鲍文波叶磊高广刚瞿欣刘红施文芳马宝红吴强华姜国发
Owner HEILONGJIANG MINGXIANG TECH
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