Method for preparing crosslinkable polyethylene cable material
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A technology for cross-linking polyethylene and cable materials, which is applied in the field of preparing cross-linkable polyethylene cable materials, can solve the problems of uneven grafting, insufficient surface properties of products, and difficulty in ensuring uniform chemical reaction.
Inactive Publication Date: 2009-11-25
SHANGHAI JIAO TONG UNIV
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The common point of these two traditional methods is that the mixing, melting, dispersion and grafting reaction of materials proceed almost simultaneously, but the disadvantage is that under the condition of process temperature, the chemical reaction
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Embodiment 1
[0024] Put into 95 parts of polyethylene (Yangzi Petrochemical, 7042 brand), 5 parts of vinyltriethoxysilane, 0.1 part of dicumyl peroxide, 0.1 part of dilauric acid in a high-speed mixer with a speed of 100 rpm Dibutyltin, 0.1 part of phenylacetic acid, 0.05 part of antioxidant 1010, 0.05 part of antioxidant 168, 0.1 part of antioxidant and anti-copper agent, 0.5 part of polyethylene wax, mixed for 20 minutes, then added to the twin-screw extruder Exiting machine, the temperature of each zone of the extruder is: zone 1 120°C, zone 2 160°C, zone 3 190°C, zone 4 210°C, zone 5 215°C, zone 6 220°C, head 220°C, melt granulation to get a A cross-linkable polyethylene cable material.
Embodiment 2
[0026] In the high-speed mixer of 100rpm, the rotation speed is to drop 75 parts of polyethylene (Yangzi Petrochemical, 7042 brand), 20 parts of ethylene-vinyl acetate copolymer (EVA, Korea 1828 brand), 1.0 parts of vinyltriethoxysilane, 2 parts of dicumyl peroxide, 1 part of dibutyltin dilaurate, 1 part of p-aminophenylacetic acid, 0.5 parts of antioxidant 1010, 0.5 parts of antioxidant and anti-copper agent, 2 parts of polyethylene wax , mixed for 20 minutes, and then added to the twin-screw extruder, the temperature of each zone of the extruder is: 120°C in the first zone, 160°C in the second zone, 190°C in the third zone, 210°C in the fourth zone, 215°C in the fifth zone, 220°C in the sixth zone, The machine head is 220°C, and melted and granulated to obtain a cross-linkable polyethylene cable material.
Embodiment 3
[0028] 55 parts of polyethylene (Yangzi Petrochemical, 7042 brand), 20 parts of polyethylene (Yangzi Petrochemical, 2426H brand), 20 parts of ethylene-vinyl acetate copolymer (EVA, Korean 1828 brand) were put into a high-speed mixer with a speed of 100 rpm. ), 2 parts of vinyltriethoxysilane, 0.2 part of dicumyl peroxide, 0.5 part of dibutyltin dilaurate, 0.5 part of p-methoxyphenylacetic acid, 0.2 part of antioxidant 1010, 0.2 parts of anti-oxidation and anti-copper agent, 0.5 parts of polyethylene wax, mixed for 20 minutes, and then added to the twin-screw extruder. The fourth zone is 210°C, the fifth zone is 215°C, the sixth zone is 220°C, and the machine head is 220°C. Melt and granulate to obtain a cross-linkable polyethylene cable material.
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Abstract
The invention discloses a preparation method of crosslinkable polyethylene cable material, which includes the steps and the following components are represented in proportion by weight: throwing polyethylene 75-95 proportion by weight, ethylene-vinyl acetate copolymer 0-20 proportion by weight, unsaturated silicone hydride 1.0-5 proportion by weight, free radical evocating agent 0.1-0.5 proportion by weight, organotin catalyst 0.1-1 proportion by weight, organic acid compound 0.1-1 proportion by weight, anti-oxidant 0.1-0.5 proportion by weight, anti-copper agent 0.1-0.5 proportion by weight, and lubricant 0.5-2 proportion by weight into the high speed mixing machine with rotary speed at 80-120 rpm for mixing 15-25 minutes, and then adding the mixture into the double-screw extruder, melting and prilling for obtaining crosslinkable polyethylene cable material. The method provided by the invention mixes all the material and dispersing uniformly, and then executes grafting reaction, thereby realizing more uniform grafting reaction and guaranteeing homogeneity of the crosslinking process, in addition, the invention uses organic acid compound which remarkably improves catalysis function of organotin catalyst, and improves crosslinking speed of silicone hydride, and overcomes the defect that the conventional silicone hydride crosslinked plastic can be linked only in warm water or steam environment with long time cooking, thereby saving production cost for manufacturer considerably. The crosslinkable polyethylene cable material obtained according to the invention is extruded by plastic cable extrusion machine unit for obtaining cable insulation layer, and is placed under the condition of 23 DEG C. with 50% humidity for one day naturally, then the crosslinking process is finished, moreover the product can pass performance indexes of hot extension performance test, dynamics test and aging characteristic test according to the national standard request.
Description
technical field [0001] The invention relates to a preparation method of a cable material, in particular to a preparation method of a crosslinkable polyethylene cable material. Background technique [0002] At present, the preparation method of cross-linked polyethylene cable material mainly adopts silane grafting and hydrolysis cross-linked polyethylene. Due to the advantages of good electrical performance, light weight and environmental protection, silane cross-linked polyethylene is gradually replacing PVC and widely used in the field of wire and cable. The market capacity is quite considerable. [0003] Silane graft crosslinking methods currently mainly include: [0004] (1) Two-step method. In this method, the matrix material polyethylene and silane are grafted into material A by melting and mixing, and then mixed with the catalyst material B, and then extruded. [0005] (2) One-step method. This method is to mix all the formula raw materials at one time, and then co...
Claims
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Application Information
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