Method for preparing phase change latent heat material by modifying polyethylene glycol compound
A polyethylene glycol-based, phase-change latent heat technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of complicated preparation procedures and low energy efficiency, achieve excellent performance indicators, reduce costs, and be good The effect of application potential
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Embodiment 1
[0033] First, add 150.000g of polyethylene glycol into the reactor, raise the temperature to 55°C, and when the polyethylene glycol is in a liquid state, add 1.080g of hydroquinone, 36.000g of acrylic acid, and 4.500g of p-toluenesulfonic acid into the reactor in sequence , and the stirring time between each feeding is 15 minutes, stir and add 46.500g cyclohexane when the temperature is raised to 80°C, continue to stir and heat up to 145°C to carry out the esterification reaction, and the water obtained in the reaction is separated during the reaction. Reaction 5 After one hour, the cyclohexane was removed by vacuuming to obtain the esterification reaction product; 22.000g of the esterification reaction product and 214.263g of methanol were added to the reactor, stirred and heated to 75°C, 0.163g of isopropanol was added, and then dripped Add a mixed solution of 8.609g methyl acrylate and 0.176g azobisisobutyronitrile for 4 hours, continue the constant temperature reaction for ...
Embodiment 2
[0035] First, add 75.000g of methoxypolyethylene glycol into the reactor, raise the temperature to 70°C, and when the methoxypolyethylene glycol is in liquid state, add 0.215g of phenothiazine and 21.500g of methacrylic acid into the reactor in sequence , 4.500g concentrated sulfuric acid, and the stirring time between each feeding is 5 minutes. When stirring and raising the temperature to 95°C, add 14.475g of benzene, continue to stir and heat up to 150°C to carry out the esterification reaction, and separate the water obtained during the reaction. After 2 hours of reaction, the benzene was removed by vacuuming to obtain the esterification reaction product; 30.123g of the esterification reaction product and 146.524g of ethanol were added to the reactor, stirred and heated to 60°C, and 0.516g of n-dodecyl Mercaptan, then add dropwise the mixed solution of 6.508g ethyl acrylate and 0.422g azobisisoheptanonitrile for 8 hours, continue the constant temperature reaction for 3 hours...
Embodiment 3
[0037] First, 120.000g of polyethylene glycol was added to the reactor, and the temperature was raised to 60°C. When the polyethylene glycol was in a liquid state, 0.648g of p-tert-butylcatechol, 14.400g of acrylic acid, and 9.600g of phosphoric acid were added to the reactor in sequence. And the stirring time between each feeding is 20 minutes, stir and add 13.440g toluene when the temperature is raised to 100°C, continue to stir and heat up to 140°C to carry out the esterification reaction, while reacting, the water obtained from the reaction is separated out, and after 10 hours of reaction, pass Vacuumize the toluene to obtain the esterification reaction product; add 40.582g of the esterification reaction product and 400.688g of p-xylene into the reactor, stir and heat up to 130°C, add 0.777g of isooctyl 3-mercaptopropionate, and then Add dropwise the mixed solution of 9.504g propyl acrylate and 0.647g dibenzoyl peroxide for 1 hour, continue the constant temperature reaction...
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