Transformer station remote monitoring system based on KVM technology
A remote monitoring system and substation technology, applied in the direction of electrical components, circuit devices, etc., can solve problems such as equipment damage, time-consuming and costly work, and misoperation of microcomputer protection devices, etc., to achieve heavy and dense changes, increase the use range, and improve The effect of work efficiency
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[0032] Described modified melamine resin foam is prepared by the following steps:
[0033] ① Add melamine, polyoxymethylene, aniline and furfural to the reaction kettle to obtain a mixed solution, add sodium hydroxide to the reaction kettle to adjust the pH value of the mixed solution to 8~9, and then raise the temperature of the mixed solution to 75~85°C for 45~ After 75 minutes, continue to add polyethylene glycol to the reactor, raise the temperature of the reactor to 90-100°C, react for 30-60 minutes and then cool to obtain a modified melamine resin; the melamine, polyoxymethylene, aniline, The weight ratio of furfural to polyethylene glycol is 1:4~8:2~4:0.5~1:0.2~0.5;
[0034] ②Add emulsifier, foaming agent and curing agent to the modified melamine resin obtained in step ①, stir at 1500~2000r / min for 5~10 minutes, foam and solidify in an oven at 70~80°C for 1 hour, and then Heat the oven to 100-110°C and cure for 1-2 hours to obtain a modified melamine resin foam; the em...
Embodiment 1
[0054] A sound-absorbing panel, characterized in that: in parts by weight, it consists of the following raw materials: 50 kg of modified melamine resin foam, 5 kg of vitrified microbeads, 5 kg of perlite, 5 kg of ceramic powder, 1 kg of polyethylene wax, 10 kg of quartz sand, Mica powder 1kg and alumina 2kg;
[0055] Described modified melamine resin foam is prepared by the following steps:
[0056] Add 50kg of melamine, 200kg of polyoxymethylene, 100kg of aniline and 25kg of furfural into the reaction kettle to obtain a mixed solution, add sodium hydroxide to the reaction kettle to adjust the pH value of the mixed solution to 8, and then raise the temperature of the mixed solution to 75°C for 45 minutes. Continue to add 10 kg of polyethylene glycol to the reactor, raise the temperature of the reactor to 90° C., react for 30 minutes and then cool to obtain a modified melamine resin;
[0057] Step to 100kg Add 10kg of emulsifier, 20kg of foaming agent and 10kg of curing a...
Embodiment 2
[0059] A sound-absorbing panel, in parts by weight, consists of the following raw materials: 60kg of modified melamine resin foam, 10kg of vitrified microspheres, 10kg of perlite, 10kg of ceramic powder, 3kg of polyethylene wax, 20kg of quartz sand, 5kg of mica powder and Alumina 5kg;
[0060] Described modified melamine resin foam is prepared by the following steps:
[0061] Add 60kg of melamine, 480kg of polyoxymethylene, 240kg of aniline and 60kg of furfural into the reactor to obtain a mixed solution, add sodium hydroxide to the reactor to adjust the pH value of the mixed solution to 9, then raise the temperature of the mixed solution to 85°C for 75 minutes, Continue to add 30kg of polyethylene glycol to the reactor, raise the temperature of the reactor to 100°C, react for 60 minutes and then cool to obtain a modified melamine resin;
[0062] Step to 100kg Add 30kg of emulsifier, 40kg of foaming agent and 30kg of curing agent to the obtained modified melamine resin,...
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