1E-level K1-type halogen-free flame-retardant heat-shrinkable pipe for nuclear power plant and preparation method thereof
A technology for nuclear power plants and heat-shrinkable tubes, which is used in nuclear power generation, nuclear engineering, climate sustainability, etc., can solve the problems that heat-shrinkable tubes cannot meet the technical requirements of nuclear power plants, and improve heat-aging resistance and flame retardancy. Good performance and the effect of improving radiation resistance
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preparation Embodiment 1
[0032] Get 50 parts by weight of ethylene-ethyl acrylate copolymer, 50 parts of ethylene-propylene rubber, 10 parts of microcapsule red phosphorus, 40 parts of aluminum hydroxide, polysuccinic acid (4-hydroxyl-2,2,6,6-tetra 1.8 parts of methyl-1-piperidine ethanol) ester, 1.2 parts of 2-(2'-hydroxy-3',5'-di-t-pentylphenyl)benzotriazole, tetrakis(β-(3,5- 4 parts of di-tert-butyl-4-hydroxyphenyl) propionate) pentaerythritol ester, 4 parts of 4,4'-thiobis(6-tert-butyl-3-methylphenol), 3.5 parts of zinc stearate. The above materials are mixed and granulated by banburying, and then extruded into pipes with a single-screw extruder. The pipes are crosslinked by cobalt 60 or electron accelerator 100KGy radiation, and the pipes after radiation crosslinking are expanded 4 times at a temperature of 120°C. , to obtain 1E grade K1 heat shrinkable tubes for nuclear power plants, the performance of which is as follows:
[0033] Flame retardancy: pass VW-1, tensile strength: 13.2Mpa, elongat...
preparation Embodiment 2
[0039]Take 50 parts by weight of low-density polyethylene, 50 parts of ethylene-propylene rubber, 5 parts of microcapsule red phosphorus, 60 parts of aluminum hydroxide, polysuccinic acid (4-hydroxy-2,2,6,6-tetramethyl- 0.5 part of 1-piperidine ethanol) ester, 0.5 part of 2-(2'-hydroxy-3',5'-di-t-pentylphenyl) benzotriazole, tetrakis(β-(3,5-di-tert-butyl 2 parts of pentaerythritol ester of 4-hydroxyphenyl)propionate, 2 parts of 4,4'-thiobis(6-tert-butyl-3-methylphenol), 1 part of polyethylene wax, zinc stearate 1 serving. The above materials are mixed and granulated by banburying, and then extruded into pipes with a single-screw extruder. The pipes are crosslinked by cobalt 60 or electron accelerator 100KGy radiation, and the pipes after radiation crosslinking are expanded 4 times at a temperature of 120°C. , to obtain 1E grade K1 heat shrinkable tubes for nuclear power plants, the performance of which is as follows:
[0040] Flame retardancy: pass VW-1, tensile strength: 12...
preparation Embodiment 3
[0046] Get 50 parts by weight of ethylene-methyl methacrylate copolymer, 50 parts of ethylene-octene copolymer, 15 parts of microcapsule red phosphorus, 20 parts of aluminum hydroxide, polysuccinic acid (4-hydroxyl-2,2, 3 parts of 6,6-tetramethyl-1-piperidine ethanol) ester, 2 parts of 2-(2'-hydroxy-3',5'-di-t-pentylphenyl) benzotriazole, tetrakis(β- 6 parts of (3,5-di-tert-butyl-4-hydroxyphenyl) propionate) pentaerythritol ester, 6 parts of 4,4'-thiobis(6-tert-butyl-3-methylphenol), stearin Zinc acid 2.5 parts, stearic acid 2.5 parts. The above materials are mixed and granulated by banburying, and then extruded into pipes with a single-screw extruder. The pipes are crosslinked by cobalt 60 or electron accelerator 100KGy radiation, and the pipes after radiation crosslinking are expanded 4 times at a temperature of 120°C. , to obtain 1E grade K1 heat shrinkable tubes for nuclear power plants, the performance of which is as follows:
[0047] Flame retardancy: Pass VW-1, tensil...
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