Plant insulating oil and preparation method thereof
A technology of vegetable insulating oil and refined vegetable oil, which is applied in the petroleum industry, lubricating compositions, etc., can solve problems such as poor lightning impulse characteristics, improve lightning impulse breakdown voltage, improve safety and reliability, and reduce the probability of insulation failures Effect
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Embodiment 1
[0028] The present embodiment prepares a kind of soybean insulating oil and comprises the following steps:
[0029] 1) Refining crude soybean oil to obtain refined soybean oil.
[0030] 2) Mix the ultraviolet absorber N-(ethoxycarbonylphenyl)-N'-methyl-N'-phenylformamidine with a wavelength of 280-400nm containing an ester group and a benzene ring with refined soybean oil:
[0031] a, adding 1% N-(ethoxycarbonylphenyl)-N'-methyl-N'-phenylformamidine into 99% refined soybean oil by mass fraction, and heating to 65 ℃;
[0032] b. Ultrasonic shake the mixture prepared in step 2) at 65°C for 30 minutes, while stirring at a speed of 75r / min for 5 hours to ensure that N-(ethoxycarbonylphenyl)-N'-methyl-N' - phenyl formamidine is fully dispersed in refined soybean oil;
[0033] c. The mixture prepared in b) in step 2) is vacuum dehydrated, heated to 50° C., and kept for 5 hours.
[0034] 3) Add antioxidants and metal deactivators:
[0035] a. Heat the mixture of UV absorber and ...
Embodiment 2
[0039] The present embodiment prepares a kind of tea seed insulating oil and comprises the following steps:
[0040] 1) Refining tea seed oil crude oil to obtain refined tea seed oil.
[0041] 2) Mix the ultraviolet absorber cinnamic acid compound 4-methoxystyrene acid-2-ethylhexyl ester containing ester group and benzene ring with a wavelength of 280-400nm and refined tea seed oil:
[0042] a, adding 4-methoxystyrene acid-2-ethylhexyl ester with a mass fraction of 5% into refined tea seed oil with a mass fraction of 95%, and heating to 80°C;
[0043] b. Ultrasonic shake the mixture prepared in step 2) at 80°C for 20 minutes, while stirring at a speed of 55r / min for 3 hours to ensure that 4-methoxystyrene acid-2-ethylhexyl ester is fully dispersed in the refining in tea seed oil;
[0044] c. The mixture prepared in b in step 2) is vacuum dehydrated, and the oil temperature is heated at 70° C. for 3 hours.
[0045] 3) Add antioxidants and metal deactivators:
[0046] a. Hea...
Embodiment 3
[0050] The present embodiment prepares a kind of rapeseed insulating oil and comprises the following steps:
[0051] 1) Refining crude rapeseed oil to obtain refined rapeseed oil.
[0052] 2) The ultraviolet absorber p-aminobenzoic acid compound 4-dimethylaminobenzoic acid-2-ethylhexyl (octyl dimethylaminobenzoate) containing an ester group and a benzene ring with a wavelength of 280-400nm:
[0053] a, adding 4-methoxystyrene acid-2-ethylhexyl ester with a mass fraction of 10% to refined rapeseed oil with a mass fraction of 90%, and heating to 70°C;
[0054] b. Ultrasonic shake the mixture prepared in step 2) at 70°C for 25 minutes, while stirring at a speed of 70r / min for 4 hours to ensure that 4-methoxystyrene acid-2-ethylhexyl ester is fully dispersed in the refining in rapeseed oil;
[0055] c. The mixture prepared in b in step 3) is subjected to vacuum dehydration, and the oil temperature is heated at 60° C. for 4 hours.
[0056] 3) Add antioxidants and metal deactivator...
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