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Ultraviolet deep crosslinked halogen-free flame-retardant ethylene propylene rubber cable material and preparation method of insulating or sheathing layer thereof

A technology of EPDM rubber and ultraviolet light, which is applied in the direction of conductor/cable insulation, inorganic insulator, cable/conductor manufacturing, etc., can solve the problems of material mechanics and processing performance degradation, poor deep penetration ability, etc., and achieve enhanced Effect of UV light-induced crosslinking efficiency

Active Publication Date: 2013-03-27
HONGLONGJIANG ORIENT SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the above-mentioned shortcoming existing in the existing ultraviolet light cross-linked EPDM technology, the contriver discovers cationic photoinitiator and free radical photoinitiator surprisingly in long-term electric wire and cable development research and production practice The combined novel photoinitiation system has a light intensity of 400-4000mW / cm 2 , The wavelength is 200-500nm and its emission spectrum intensity distribution matches the cationic photoinitiator’s absorption spectrum and its intensity distribution. Under the condition of a specific ultraviolet light source, the molten state is carried out on-line continuous ultraviolet irradiation crosslinking for 0.5-20 seconds to obtain deep crosslinking At the same time, grafted modified EPDM rubber, surface-modified sub-nanometer or nano-scale metal hydroxide, flame retardant synergist and smoke suppressant are used in the formulation system of halogen-free flame retardant materials. Various comprehensive technical means are used to solve key technical problems such as the poor deep penetration ability of ultraviolet light in metal hydroxide halogen-free flame retardant materials with large additions and the serious deterioration of material mechanics and processing properties, so as to provide a cross-linking Low equipment investment, simple process, high production efficiency, low product cost, good performance, energy saving and environmental protection, and can achieve UV depth of UV cross-linked low-smoke, halogen-free, flame-retardant EPDM cable new material and new technology with uniform depth Cross-linked halogen-free flame-retardant (referring to low-smoke halogen-free flame-retardant) EPDM cable material (referring to cable insulation or sheath material) and its method for preparing cable insulation layer or sheath layer,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put 85 parts of E-type EPDM into the internal mixer by weight, 5 parts of glycidyl methacrylate grafted EPDM rubber, 10 parts of maleic anhydride grafted EPDM rubber, surface modified magnesium hydroxide 110 parts, 2.5 parts of 4,4'-dimethyldiphenyliodonium phosphate, 1.5 parts of BDK, 1 part of TMPTA, 10100.2 parts of antioxidant, 0.1 part of DLTP, 5 parts of paraffin oil, 2 parts of zinc borate, three 10 parts of molybdenum oxide, mixed at 100-150°C for 8-10 minutes, then extruded through a twin-screw extruder to make a light-crosslinked halogen-free flame-retardant EPDM cable material; The core is melted and extruded to form a 3.2mm insulating layer or sheath layer, and then the insulating layer or sheath layer is melted in the ultraviolet radiation cross-linking equipment using the H-shaped microwave-excited electrodeless lamp as the light source. On-line continuous ultraviolet light irradiation crosslinking, the crosslinking time is 10 seconds. The experimental re...

Embodiment 2

[0033] Put 70 parts of E-type EPDM into the internal mixer by weight, 15 parts of glycidyl methacrylate grafted EPDM rubber, 15 parts of maleic anhydride grafted EPDM rubber, surface modified ultrafine hydrogen 120 parts of alumina, 2.5 parts of triarylsulfonium hexafluorophosphate, 1.2 parts of BDK, 0.8 parts of BP, 3 parts of TAIC, 1680.6 parts of antioxidant, 0.3 parts of DTDTP, 5 parts of paraffin oil, 2 parts of zinc borate, octamolybdenum 2 parts of ammonium acid, mixed at 100-150°C for 8-10 minutes, and then extruded through a twin-screw extruder to make a light-crosslinked halogen-free flame-retardant EPDM cable material; and then on the conductive core of the cable Melt extrusion coating into a 3.0mm insulating layer or sheath layer, and then carry out continuous online continuous melting of the insulating layer or sheath layer in the ultraviolet radiation crosslinking equipment using the H-type microwave excitation electrodeless lamp as the light source Cross-linking...

Embodiment 3

[0037] Put 85 parts of D-type EPDM into the internal mixer by weight, 10 parts of glycidyl methacrylate grafted EPDM rubber, 5 parts of n-butyl acrylate grafted EPDM rubber, nano-layered dihydrogen 75 parts of oxide, 75 parts of surface modified aluminum hydroxide, 2.0 parts of ferrocene hexafluorophosphate, 1.2 parts of BDK, 0.8 parts of I-1840, 2.5 parts of TMPTA, 10100.6 parts of antioxidant, 0.3 parts of TPP, 5 parts of paraffin oil 5 parts, fumed silica 5 parts, ammonium octamolybdate 5 parts, mixed at 100-150 ℃ for 8-10 minutes, and then extruded through a twin-screw extruder to produce light-crosslinked halogen-free flame-retardant EPDM Rubber cable material; then melt-extrude and coat the retardant material on the conductive core of the cable to form a 3.2mm insulating layer or sheath layer, and then use the D-type microwave excitation electrodeless lamp as the light source for ultraviolet radiation cross-linking equipment The insulating layer or the sheath layer is su...

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Abstract

The invention relates to an ultraviolet deep crosslinked halogen-free flame-retardant ethylene-propylene-diene monomer (EPDM) rubber cable material and a preparation method of an insulating or sheathing layer thereof. The method is characterized by comprising the following steps of: mixing and extruding to form the cable material by using EPDM rubber and graft modified EPDM rubber as base materials and compounding a metal hydroxide flame retardant, light initiating bodies of a cationic photoinitiator and a free radical photoinitiator and the like; and then performing molten on-line continuous ultraviolet irradiation on a coated cable insulating or sheathing layer in ultraviolet irradiation cross-linking equipment provided with a thermal electronic excited medium-voltage mercury arc lamp or a microwave excited H-shaped, D-shaped or V-shaped electrodeless lamp serving as a specific light source to prepare the ultraviolet deep crosslinked halogen-free flame-retardant EPDM rubber cable insulating or sheathing layer. The technology has unique advantages that: the required cross-linking equipment is low in investment; the process is simple and high in production efficiency; the product has low cost and good quality; and the method is energy-saving and environment-friendly, and is widely used for manufacturing high-performance crosslinked flame-retardant rubber wire and cable products.

Description

technical field [0001] The invention belongs to the field of rubber cross-linked flame-retardant cables, and in particular relates to a preparation method of an insulating or sheathing material and an insulating or sheathing layer of EPDM rubber cables deeply cross-linked by ultraviolet light. Background technique [0002] Ethylenepropylene diene monomer (EPDM) is widely used as wire and cable insulation or sheath material because of its excellent electrical properties, excellent heat and aging resistance, and low temperature flexibility. However, the oxygen index of EPDM rubber is only about 20%, which is easy to catch fire and cause fire. Therefore, flame-retardant EPDM wires and cables are required to be used in many occasions, especially in rail transit, nuclear power, mining and shipbuilding industries that require high flame-retardant wires and cables. [0003] Chinese Patent Publication No. CN1106425 discloses the use of high-energy electron beam radiation to prepare...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/16C08L51/06C08K13/02C08K3/22C08K3/26C08K13/06C08J3/28C08J3/24H01B3/02H01B7/02H01B7/17H01B13/00H01B13/14H01B13/24
Inventor 瞿保钧鲍文波叶磊高广刚瞿欣刘红施文芳祁鑫吴强华李吉昌
Owner HONGLONGJIANG ORIENT SCI & TECH
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