Preparation method of high-heat-resistance high-strength half tubes used for embedded electric cables

A power cable, high heat resistance technology, applied in the field of plastic Huff tube preparation, can solve the problems of poor creep resistance, low flame retardant grade of modified polypropylene Huff tube, low Vicat softening temperature, etc. High combustion grade, good creep resistance, good compressive and tensile properties, and high softening temperature

Active Publication Date: 2012-07-25
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of low Vicat softening temperature, poor creep resistance and low flame retardancy level of the modified polypropylene Huff tube

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put PET with an intrinsic viscosity of 0.645dL / g and a melting point of 259°C in an electric heating constant temperature blast drying oven, control the temperature of the electric heating constant temperature blast drying oven at 148°C, and after drying for 4 hours, weigh 69Kg of PET and place it in a high-speed mixer. Add 15Kg of PPR with an ethylene content of 4% and 4.8Kg of PE-g-MAH with a mass fraction of maleic anhydride grafting of 0.8% in sequence, control the speed of the high-speed mixer at 300r / min, and the temperature at 107°C, stirring and mixing for 7 minutes; Then add 10Kg of flame retardant masterbatch containing 80% microencapsulated red phosphorus, 15% ethylene-vinyl acetate copolymer, and 5% oxidized polyethylene, and add tris(2,4-di-tert-butylphenyl)phosphorous acid at the same time Ester 0.75Kg, continue to stir and mix for 5 minutes to form a mixture; put the mixture in the hopper of the parallel exhaust twin-screw extruder, and control the barrel ...

Embodiment 2

[0019] Put PET with an intrinsic viscosity of 0.645dL / g and a melting point of 259°C in an electric heating constant temperature blast drying oven, control the temperature of the electric heating constant temperature blast drying oven at 147°C, and after drying for 4 hours, weigh 73Kg of PET and place it in a high-speed mixer. Add 17Kg of PPR with an ethylene content of 4% and 5.0Kg of PE-g-MAH with a maleic anhydride grafting rate of 0.8% in sequence, control the speed of the high-speed mixer at 300r / min, and the temperature at 106°C, stirring and mixing for 7 minutes; Then add 11Kg of flame retardant masterbatch containing 80% microencapsulated red phosphorus, 15% ethylene-vinyl acetate copolymer, and 5% oxidized polyethylene, and add tris(2,4-di-tert-butylphenyl)phosphorous acid at the same time Ester 0.9Kg, continue to stir and mix for 5 minutes to form a compound; put the compound in the hopper of the co-rotating parallel venting twin-screw extruder, control the barrel tem...

Embodiment 3

[0021]Put PET with an intrinsic viscosity of 0.645dL / g and a melting point of 259°C in an electric heating constant temperature blast drying oven, control the temperature of the electric heating constant temperature blast drying oven at 149°C, and after drying for 4 hours, weigh 64Kg of PET and place it in a high-speed mixer. Add 14Kg of PPR with a mass fraction of ethylene content of 4%, 3.8Kg of PE-g-MAH with a mass fraction of maleic anhydride grafting rate of 0.8% in sequence, control the speed of the high-speed mixer at 300r / min, and the temperature at 108°C, stirring and mixing for 7 minutes; Then add 9Kg of flame retardant masterbatch containing 80% microencapsulated red phosphorus, 15% ethylene-vinyl acetate copolymer, and 5% oxidized polyethylene, and add tris(2,4-di-tert-butylphenyl)phosphorous acid at the same time Ester 0.6Kg, continue to stir and mix for 5 minutes to form a mixture; put the mixture in the hopper of the parallel exhaust twin-screw extruder, control ...

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Abstract

The invention relates to a preparation method of high-heat-resistance high-strength half tubes used for embedded electric cables, which includes steps of utilizing 63-75 weight parts of polyethylene glycol terephthalate as raw materials, adding 13-18 weight parts of propylene-ethylene random copolymer, 8-12 weight parts of fire retardant masterbatches, 3.5-6.0 weight parts of maleic anhydride grafting polyethylene and 0.5-1.0 weight part of Triisodecyl (2,4-di-tertiary butyl phenyl) phosphite ester, and preparing the half tubes by drying, dewatering, mixing, stirring, extruding, pelleting, extruding, forming, cooling and forming. The half tubes prepared by the preparation method are high in vicat softening temperature, fine in insulation performance, high in corrosion resistance and fire retardant level, resistant to creep deformation, fine in pressure and tension resistance and applicable to fields of protection modifying of directly-embedded cables, protection of ground access cables and paving protection tubes of seabed cables and the like.

Description

technical field [0001] The invention relates to a preparation method of a plastic half tube, in particular to a preparation method of a high heat-resistant and high-strength half tube for buried power cables. Background technique [0002] A symbolic change in a modern city is to bury the various high and low voltage power lines that are densely lined with cobwebs on both sides of the city's roads underground, so as to eliminate people's "visual pollution" and achieve the purpose of beautifying the city. The laying methods of underground power cable lines mainly include direct burial laying, trench laying, and pipe laying. Among them, pipe laying is widely used in the power industry because of its small footprint, simple construction, low construction cost, and short construction period. application. Cement asbestos pipes were generally used in the buried power cable protection pipes (pipes) used in the early days. When burying, large-scale excavation and long-term road clos...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L23/16C08L51/06C08K5/526C08K9/10C08K3/02C08J3/22B29C47/92H02G3/04B29C48/92
CPCB29C48/04B29C48/40B29C2948/92895
Inventor 张华集陈晓肖荔人张雯
Owner FUJIAN NORMAL UNIV
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