Double-wall hot pyrocondensation pipe for automobile metal pipeline and preparation method for double-wall hot pyrocondensation pipe
A technology of double-walled heat-shrinkable tubes and metal tubes, applied in the direction of pipes/pipe joints/fittings, pipe protection, mechanical equipment, etc., can solve the problems of vehicle accidents, parts wear, personnel and property, etc., to prolong the service life, Low production cost, stress relief effect
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Embodiment 1
[0024] Example 1: A double-walled heat-shrinkable tube for automotive metal pipelines.
[0025] (1) Weigh 40 kg of low-density polyethylene, 20 kg of ethylene-methyl acrylate copolymer, 5 kg of nano-active calcium carbonate (particle size 25 nm), 1 kg of magnesium stearate, 1 kg of dibutyl hydroxytoluene and Nano-carbon black (particle size is 20 nm) 3 kg, and mixed evenly to obtain a premix;
[0026] (2) The premix obtained in step (1) is mixed and granulated on a twin-screw extruder equipped with an internal mixer, and co-extruded with ethylene-methyl acrylate copolymer on a single-screw extruder to obtain double wall pipe;
[0027] (3) The double-walled tube obtained in step (2) was radiated and cross-linked at 150 kGy, heated to expand twice, and quenched to form a double-walled heat-shrinkable tube for automotive metal pipelines.
Embodiment 2
[0028] Example 2: A double-wall heat-shrinkable tube for automotive metal pipelines.
[0029] (1) Weigh 80 kg of low-density polyethylene, 50 kg of ethylene-methyl acrylate copolymer, 15 kg of nano-active calcium carbonate (with a particle size of 100 nm), 3 kg of magnesium stearate, 3 kg of dibutyl hydroxytoluene and Nanometer carbon black (particle size is 50 nm) 8 kg, and mix evenly, obtain the premix;
[0030] (2) The premix obtained in step (1) is mixed and granulated on a twin-screw extruder equipped with an internal mixer, and co-extruded with ethylene-methyl acrylate copolymer on a single-screw extruder to obtain double wall pipe;
[0031] (3) The double-walled tube obtained in step (2) was radiated and cross-linked at 150 kGy, heated to expand twice, and quenched to form a double-walled heat-shrinkable tube for automotive metal pipelines.
Embodiment 3
[0032] Example 3: A double-walled heat-shrinkable tube for automotive metal pipelines.
[0033] (1) Weigh 50 kg of low-density polyethylene, 30 kg of ethylene-methyl acrylate copolymer, 8 kg of nano-active calcium carbonate (30 nm in particle size), 1 kg of magnesium stearate, 1 kg of dibutyl hydroxytoluene and Nano-carbon black (particle size is 30 nm) 4 kg, and mixed evenly to obtain a premix;
[0034] (2) The premix obtained in step (1) is mixed and granulated on a twin-screw extruder equipped with an internal mixer, and co-extruded with ethylene-methyl acrylate copolymer on a single-screw extruder to obtain double wall pipe;
[0035] (3) The double-walled tube obtained in step (2) was radiated and cross-linked at 150 kGy, heated to expand twice, and quenched to form a double-walled heat-shrinkable tube for automotive metal pipelines.
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