Heat-shrinkable insulating material and its preparation process in the shell of the third generation nuclear power plant
An insulating material and heat-shrinkable technology, which is applied in the field of heat-shrinkable insulating materials and their preparation, can solve the problems that heat-shrinkable insulating materials cannot be achieved at the same time, and achieve excellent radiation resistance, good solvent resistance, excellent mechanical properties and electrical properties. performance effect
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[0043] The invention provides a method for preparing a heat-shrinkable insulating material, comprising:
[0044] A) mixing polyolefin resin, flame retardant, antioxidant, methyl vinyl phenyl silicone rubber, methyl trifluoropropyl silicone rubber and auxiliary agents to obtain a masterbatch; the polyolefin resin, flame retardant The weight ratio of agent, antioxidant, methyl vinyl phenyl silicone rubber, methyl trifluoropropyl silicone rubber and auxiliary agent is (40~80):(20~50):(1~4):(1 ~5): (1~5): (1~10);
[0045] B) molding and irradiating the masterbatch to obtain a heat-shrinkable insulating material.
[0046] In the present invention, firstly, polyolefin resin, flame retardant, antioxidant, methyl vinyl phenyl silicone rubber, methyl trifluoropropyl silicone rubber and additives are mixed to obtain a masterbatch;
[0047] Preferably, the step A) is specifically: after mixing the polyolefin resin, flame retardant and antioxidant, adding methyl vinyl phenyl silicone rubb...
Embodiment 1
[0081] Use coupling agent SCA / 113 to couple aluminum hydroxide, magnesium hydroxide and nitrogen flame retardant respectively.
[0082] Add 120g LLDPE7042, 350g EVA1405, 12g antioxidant 7910, 210g aluminum hydroxide, 110g magnesium hydroxide, 45g nitrogen flame retardant FR-PN, 12ml methyl mercaptide heat stabilizer into the internal mixer, 135℃ Mix the mixture for 20 minutes, then add 10g of carbon black N330, 15g of methyl vinyl phenyl silicone rubber, 20g of raw methyl trifluoropropyl silicone rubber and 15ml of TMPTA and mix for 12 minutes. Obtain heat-shrinkable insulating material masterbatch in the third generation nuclear power shell, press this material with oil press for sample preparation, then irradiate 150KGy with electron accelerator, obtain heat-shrinkable insulating material sample 1# in the third-generation nuclear power shell, according to the present invention According to the measurement method described above, the thermal life at 90°C can reach 60 years; o...
Embodiment 2
[0084] Use coupling agent SCA / 113 to couple aluminum hydroxide, magnesium hydroxide and nitrogen flame retardant respectively.
[0085] 510g LDPE-1I2A, 10g antioxidant AT-10, 185g treated aluminum hydroxide, 120g treated magnesium hydroxide, 70g treated nitrogen-based flame retardant MCA, 12ml methyl mercaptide heat stable at 135°C Mix the mixture for 20 minutes, then add 12g of carbon black N330, 18g of methyl vinyl phenyl silicone rubber, 17g of raw methyl trifluoropropyl silicone rubber, and 20ml of TMPTMA and mix for 15 minutes. Obtain the heat-shrinkable insulating material masterbatch in the third-generation nuclear power shell, press this material with an oil press to prepare samples, then irradiate 120KGy with an electron accelerator, and obtain the heat-shrinkable insulating material sample 2# in the third-generation nuclear power shell, according to the present invention According to the measurement method, the thermal life at 90°C can reach 60 years; the other perfo...
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