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Method for inhibiting aging of cross-linked polyethylene insulated electrical tree based on benzophenone derivative
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A cross-linked polyethylene and electric tree aging technology, which is applied in the field of inhibiting high-voltage DC cross-linked polyethylene cable insulation electric tree aging based on benzophenone derivatives, can solve the problem of destroying the insulating properties of cross-linked polyethylene materials
Inactive Publication Date: 2018-11-13
TIANJIN UNIV
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Problems solved by technology
However, how to ensure the uniform dispersion of nanoparticles in cross-linked polyethylene materials has always been a difficult problem that cannot be effectively solved
The agglomeration of nanoparticles in the cross-linked polyethylene material will make the nanoparticles themselves an impurity and seriously damage the insulating properties of the cross-linked polyethylene material
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Embodiment 1
[0027] Method of the present invention specifically comprises the steps:
[0028] Step 1) dry LDPE and antioxidant 1010, dicumyl peroxide (DCP) and 4,4'-dihydroxybenzophenone (see the chemical formula figure 1 ) according to the mass ratio of 100:0.1:2:0.5 in the internal mixer for 30 minutes, the temperature is 110°C, and the internal mixer speed is 100r / min.
[0029] Step 2) Weigh 40 grams of LDPE mixture and place it in a flat vulcanizer, preheat it at 120°C for 10 minutes to fully melt the mixture; pressurize the flat vulcanizer to 30MPa, and simultaneously raise the temperature to 180°C and press for 30 minutes to make the LDPE Fully cross-linked as cross-linked polyethylene (XLPE).
[0030] Step 3) Turn off the power supply of the flat vulcanizer, keep the pressure constant, let the sample cool down to room temperature naturally, and then take it out. During the cooling process, insert the needle electrode into the sample with the pin mold, see figure 2 , so that the...
Embodiment 2
[0036] A control group is set, and 4,4'-dihydroxybenzophenone is not added in step 1) of the control group, and other steps are the same as in Example 1.
Embodiment 3
[0038] Method of the present invention specifically comprises the steps:
[0039] Step 1) dry LDPE and antioxidant 1035, ethyleneperoxide and 4,4'-dihydroxybenzophenone (see the chemical formula figure 1 ) according to the mass ratio of 100:0.1:2:0.5 in the internal mixer for 25 minutes, the temperature is 110°C, and the internal mixer speed is 80r / min.
[0040] Step 2) Weigh 40 grams of LDPE mixture and place it in a flat vulcanizer, preheat it at 115°C for 15 minutes to fully melt the mixture; pressurize the flat vulcanizer to 30MPa, raise the temperature to 175°C at the same time, press for 40 minutes, and make the LDPE Fully cross-linked as cross-linked polyethylene (XLPE).
[0041] Step 3) Turn off the power supply of the flat vulcanizer, keep the pressure constant, let the sample cool down to room temperature naturally, and then take it out. During the cooling process, insert the needle electrode into the sample with the pin mold. See the sample picture. figure 2 , ...
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Abstract
The invention discloses a method for inhibiting aging of a cross-linked polyethylene insulated electrical tree based on a benzophenone derivative. The method comprises the following steps: fully mixing dried LDPE (low-density polyethylene) with an antioxidant, a cross-linking agent and 4,4'-dihydroxyl benzophenone in an internal mixer according to a mass ratio of 100 to 0.1 to 2 to 0.5; preheatingthe LDPE by a curing press for sufficient melting, and performing sufficient cross linking to obtain an XLPE (cross-linked polyethylene) sample; while keeping the pressure unchanged, naturally cooling to room temperature and inserting a needle electrode into the sample by a needle insertion mould during the cooling; performing vacuum drying on the sample again for 24-48 hours so as to totally eliminate the impurities generated in the sample cross-linking process; finally, conducting an experiment by using a direct-current overlapped impulse voltage electrical tree experimental system device.
Description
technical field [0001] The invention belongs to the field of high-voltage DC cable insulation, and in particular relates to a method for inhibiting the aging of cross-linked polyethylene insulation electrical branches based on benzophenone derivatives, in particular to a method for inhibiting high-voltage direct-current cross-linked polyethylene cables based on benzophenone derivatives Methods of aging insulation electrical branches. Background technique [0002] High-voltage DC cables play an irreplaceable role in today's power systems, and cross-linked polyethylene is currently the main insulating material used in high-voltage DC cables. However, in the actual operation of power cables, due to the existence of local electric field intensity concentrated areas such as impurities or defects in the cables, it is possible to cause electric trees. The phenomenon of dendration appears, and electrical dendration has become an important factor of cable insulation failure. Theref...
Claims
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