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Preparation method of modified polyethylene terephthalate cable sheath tube

A technology of polyethylene terephthalate and ethylene glycol phthalate, which is applied in the field of preparation of plastic sheath tubes, and can solve problems such as low Vicat softening temperature, insufficient creep resistance and ring stiffness , achieve good creep resistance and flame retardancy, improve oxygen index and flame retardancy, improve impact strength and compressive strength

Inactive Publication Date: 2012-07-25
FUJIAN NORMAL UNIV +4
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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, insufficient creep resistance and ring rigidity in existing PVC-C plastic pipes for buried power cables, the invention provides a modified polyethylene terephthalate Preparation method of cable sheath tube

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put PET with an intrinsic viscosity of 0.675dL / g and a melting point of 258°C in an electric heating constant temperature blast drying oven, control the temperature of the electric heating constant temperature blast drying oven at 133°C, and after drying for 5 hours, weigh 62Kg of PET and place it in a high-speed mixer. Add 15 Kg of PPB with a mass fraction of ethylene content of 7%, and 5 Kg of EEA with a mass fraction of ethyl acrylate of 23% in sequence, control the speed of the high-speed mixer at 250r / min, and the temperature at 103°C, stir and mix for 6 minutes, and then add the mass fraction of red phosphorus 6.5 Kg of microencapsulated red phosphorus with a fraction of 85%, 0.5 Kg of diethyl 3,5-di-tert-butyl-4-hydroxybenzyl phosphate, and continue to stir and mix for 8 minutes to form a mixture; place the mixture in parallel rows In the hopper of the gas-type twin-screw extruder, control the temperature of the barrel of the parallel-exhaust twin-screw extruder i...

Embodiment 2

[0020] Put PET with an intrinsic viscosity of 0.675dL / g and a melting point of 258°C in an electric heating constant temperature blast drying oven, control the temperature of the electric heating constant temperature blast drying oven at 132°C, and after drying for 5 hours, weigh 73Kg of PET and place it in a high-speed mixer. Add 20Kg of PPB with a mass fraction of ethylene content of 7%, and 8Kg of EEA with a mass fraction of ethyl acrylate of 23% in sequence, control the speed of the high-speed mixer at 250r / min, and the temperature at 102°C, stir and mix for 6 minutes, and then add the mass fraction of red phosphorus 9.0 Kg of 85% microencapsulated red phosphorus, 1.0 Kg of 3,5-di-tert-butyl-4-hydroxybenzyl diethyl phosphate, and continue to stir and mix for 8 minutes to form a mixture; place the mixture in the same direction and parallel exhaust In the hopper of the twin-screw extruder, control the barrel temperature of the parallel exhaust twin-screw extruder: 205°C in zo...

Embodiment 3

[0023]Put PET with an intrinsic viscosity of 0.675dL / g and a melting point of 258°C in an electric heating constant temperature blast drying oven, control the temperature of the electric heating constant temperature blast drying oven at 134°C, and after drying for 5 hours, weigh 67Kg of PET and place it in a high-speed mixer. Add 18Kg of PPB with a mass fraction of ethylene content of 7%, and 6.5Kg of EEA with a mass fraction of ethyl acrylate of 23% in sequence, control the speed of the high-speed mixer at 250r / min, and the temperature at 104°C, stir and mix for 6 minutes, and then add the mass fraction of red phosphorus 8.0 Kg of microencapsulated red phosphorus with a fraction of 85%, 0.8 Kg of diethyl 3,5-di-tert-butyl-4-hydroxybenzyl phosphate, and continue to stir and mix for 8 minutes to form a mixture; place the mixture in parallel rows In the hopper of the gas-type twin-screw extruder, control the barrel temperature of the co-rotating parallel exhaust type twin-screw e...

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PUM

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Abstract

The invention relates to a preparation method of a modified polyethylene terephthalate cable sheath tube. The preparation method comprises the following steps of: with 62-73 parts by weight of polyethylene terephthalate as a raw material, adding 15-20 parts by weight of propylene-ethylene block copolymer, 5-8 parts by weight of ethylene-acrylic acid ethyl ester copolymer, 6.5-9.0 parts by weight of micro-encapsulation red phosphorus, 0.5-1.0 part by weight of 3, 5-di-tert-butyl-4 hydroxy benzyl diethyl phosphate, drying the mixture, stirring and mixing the mixture at a high speed, extruding and pelletizing the mixture by using a double screw, extruding and forming by using a single screw, and forming the cable sheath tube by using a cooling and setting technology. The cable sheath tube prepared by the method has the advantages that the vicat softening temperature is higher than 153 DEG C, the ring stiffness is greater than 25KN / m<2>, the volume resistivity is greater than 3.0*1011, the creep resistance and flame retardant property are good; and the cable sheath tube is suitable for the fields of buried power cable sheaths and the like.

Description

technical field [0001] The invention relates to a method for preparing a plastic sheath tube, in particular to a method for preparing a modified polyethylene terephthalate sheath tube for buried power cables. Background technique [0002] In the construction of the national grid, in order to protect the urban and rural living and investment environment, reduce overhead power cable transmission lines, eliminate people's "visual pollution", and achieve the purpose of beautifying the city, power cable transmission lines have been buried from overhead. The laying methods of underground power cables 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. Cement asbestos pipes were generally used in the buried power cable protection pipes (pipes) used in the early days. When burying, large-scale excavat...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L53/00C08L23/08C08L33/08C08K9/00C08K3/02B29C47/92B29B9/06H02G9/06B29C48/92
CPCB29C48/09B29C48/022B29C48/04B29C48/92B29C2948/92704B29C2948/92895B29C2948/92904
Inventor 张华集陈晓肖荔人张雯
Owner FUJIAN NORMAL UNIV