Outdoor anti-aging dual-wall heat-shrinkable tube and preparation method thereof
A heat-shrinkable sleeve and anti-aging technology, which is applied in the field of materials, can solve the problems of discoloration, poor self-repairability, and brittleness, and achieve the effects of improving service life, avoiding safety accidents, and excellent flame retardancy
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Embodiment 1
[0033] First, take the heat-shrinkable layer raw materials in the following parts by weight:
[0034] Polyethylene 30 parts,
[0035] 10 parts of magnesium hydroxide,
[0036] 1 part red phosphorus,
[0037] Light stabilizer 0.1 part,
[0038] Antioxidant 1010 0.5 parts,
[0040] 2 parts of masterbatch,
[0041] 0.4 parts of silicone rubber.
[0042] Add the above mixture into a closed internal mixer operating at high speed for mixing, and the temperature is controlled within the range of 100-140°C. Preferably, during the granulation process of the internal mixer, the number of turning over of the mixture is controlled within 3-8 times, the temperature is controlled within the range of 95-150°C, and the components of the material have good dispersion and high uniformity. The mixture obtained by kneading is extruded with a single-screw extruder at 100-150° C., pelletized, and air-cooled to form the outer heat-shrinkable layer of the double-...
Embodiment 2
[0052] First, take the heat-shrinkable layer raw materials in the following parts by weight:
[0053] 35 parts of ethylene-vinyl acetate copolymer,
[0054] 20 parts of aluminum hydroxide,
[0055] Microcapsule red phosphorus 10 parts,
[0056] 1 part light stabilizer,
[0057] Antioxidant 1010 1 part,
[0058] Zinc stearate 1.5 parts,
[0059] 1.5 parts of masterbatch,
[0060] 1 part silicone rubber;
[0061] in , The melt index of the ethylene-vinyl acetate copolymer is 1-5g / 10min (190°C), and the weight content of vinyl acetate is 17%-20%.
[0062]Add the above mixture into a closed internal mixer operating at high speed for mixing, and the temperature is controlled within the range of 100-140°C. Preferably, during the granulation process of the internal mixer, the number of turning over of the mixture is controlled within 3-8 times, the temperature is controlled within the range of 95-150°C, and the components of the material have good dispersion and high uniformi...
Embodiment 3
[0072] First, take the heat-shrinkable layer raw materials in the following parts by weight:
[0073] 40 parts of ethylene-vinyl acetate copolymer,
[0074] 25 parts of magnesium hydroxide,
[0075] Microcapsule red phosphorus 10 parts,
[0076] 5 parts of light stabilizer,
[0077] Antioxidant 1010 1.5 parts,
[0078] Zinc stearate 0.5 parts,
[0079] 2 parts of masterbatch,
[0080] 1 part silicone rubber;
[0081] Wherein, the melt index of the ethylene-vinyl acetate copolymer is 1-5g / 10min (190°C), and the weight content of vinyl acetate is 17%-20%.
[0082] Add the above mixture into a closed internal mixer operating at high speed for mixing, and the temperature is controlled within the range of 100-140°C. Preferably, during the granulation process of the internal mixer, the number of turning over of the mixture is controlled within 3-8 times, the temperature is controlled within the range of 95-150°C, and the components of the material have good dispersion and hig...
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