Magnetic particle with hydrophilic polymer coating, preparation and water-base magnetic flowing deformating liquid therefrom
A hydrophilic polymer, magnetic particle technology, applied in lubricating composition, dyeing polymer organic compound treatment, petroleum industry and other directions, can solve the problems of poor suspension stability of magnetic metal particles, easy oxidative deterioration and caking, etc. Overcome the effect of poor suspension stability, good compatibility and significant magnetorheological effect
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example 1
[0024] Coat the surface with γ-Fe 2 o 3 Add 56.0g of carbonyl iron powder, 1.2mL of ethyl silicate, and 50mL of DMF solution of 0.04mol / L triethoxy-ω-(methoxypolyoxyethylene urethane)propylsilane into a three-necked flask, Stir at high speed for 30 minutes to make them fully mixed, then adjust the pH of the system to 8.0 by slowly adding 1.0mol / L ammonia water 10ml dropwise while stirring, then stir for 48 hours under the condition of 500r / min, finally, magnetic separation, deionization Wash with water, repeat this process 3 times, and collect the solids and dry them in vacuum at 80°C for 8 hours to obtain magnetic particles wrapped by hydrophilic polymers (or core-shell composite particles of polyoxyethylene-wrapped carbonyl iron), and the inner core is carbonyl iron , the intermediate transition layer is γ-Fe 2 o 3 , the shell layer is polyoxyethylene, and the particle size of the magnetic metal carbonyl iron powder is 0.1-10.0 μm. The TEM photos confirm that the surface...
example 2
[0026] Carbonyl-Al 2 o 3Add 84.0g of powder core-shell composite particles, 1.0mL of aluminum ethoxide, and 100mL of N,N-dimethylformamide of 0.04mol / L trimethoxy-ω-methoxypolyoxyethylene propylsilane into a three-necked flask After stirring at high speed for 20 minutes to make them fully mixed, adjust the pH value of the system to 12.0 by slowly adding 20ml of 1.0mol / L ammonia water dropwise while stirring, and then stir for 36 hours under the condition of 500r / min. Finally, magnetic separation, Washing with deionized water was repeated three times, and the solid was collected and dried in vacuum at 80° C. for 8 hours to obtain polyoxyethylene-coated carbonyl-iron-nickel alloy core-shell composite particles (ie, hydrophilic polymer-coated magnetic particles). The polyoxyethylene-wrapped carbonyl-iron-nickel alloy core-shell composite particles have good compatibility with water. According to the volume ratio, 35 parts of polyoxyethylene-wrapped carbonyl iron-nickel alloy cor...
example 3
[0028] 78.0 g of iron-cobalt-nickel alloy particles with an average particle size of 5 microns, 4.0 mL of ethyl silicate, and 0.04 mol / L trimethoxy-ω-ethoxypolyoxyethylene propyl silane, Add 200mL of N-dimethylformamide into the three-necked flask, stir at high speed for 20min to make them fully mixed, then adjust the pH of the system to 8.5 by slowly adding 1.0mol / L ammonia water 15ml dropwise while stirring, and then Stirring for 72 hours under certain conditions, and finally, magnetic separation, deionized water washing, repeated 3 times, and collected solids at 70 ° C for 10 hours of vacuum drying, that is, polyoxyethylene-wrapped iron-cobalt-nickel alloy core-shell composite particles (i.e. Magnetic particles coated with hydrophilic polymer). The core-shell composite particle of polyoxyethylene-wrapped iron-cobalt-nickel alloy has good compatibility with water. According to the volume ratio, 90 parts of water, 1.5 parts of cellulose sodium carboxylate powder, and 0.5 part...
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