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
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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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