Silicone oil-based magnetic liquid and preparation method thereof
A magnetic liquid and silicone oil technology, applied in the field of materials, can solve problems such as inability to meet the needs of complex industrial environments, large viscosity changes, etc., and achieve the best magnetic performance and stability, high magnetic saturation strength, and good fluidity.
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[0026] The embodiment of the present invention also provides a method for preparing a silicone oil-based magnetic liquid, comprising the following steps:
[0027]a. Modification: add nano magnetic particles into ammonia water and surfactant, stir and react to obtain modified nano magnetic particles; preferably, the reaction temperature is 20-100°C, and the stirring speed is 200-400r / min, The reaction time is 1-60min, the mass ratio of surfactant and ammonia water is 1:(1-2), and the concentration of ammonia water is 25-28%;
[0028] b. Dosing: wash and dry the modified nano-magnetic particles and disperse them in the base carrier liquid. Preferably, wash with deionized water until the conductivity of the eluate is σ≤30 μs / cm, and then wash with acetone for 2~ 4 times, and finally remove acetone by vacuum drying to obtain an initial magnetic liquid, which is added to silicone oil containing a silicone oil emulsifier to obtain a silicone oil-based magnetic liquid.
[0029] In t...
Embodiment 1
[0034] Example 1Fe 3 o 4 Preparation of silicone oil-based magnetic liquid
[0035] 1. Preparation of magnetic nanoparticles
[0036] Weigh 11g of FeCl 3 ·6H 2 O and 9.7 g FeCl 2 4H 2 O, dissolved in 513mL deionized water, in a water bath at 45°C, stirred at 400r / min for 10min to make it uniform; weighed 17g of concentrated ammonia water, added dropwise to the mixed salt solution, kept heating, the reaction temperature was controlled at 40°C, and stirred After 40 minutes, it can be observed that the mixed solution changes rapidly from yellow to black. After the reaction is completed, magnetically separate magnetic nanoparticles to obtain magnetic nanoparticles, and wash them repeatedly with deionized water until the conductivity of the eluate is σ≤100μs / cm;
[0037] 2. Activation
[0038] Place the magnetic nanoparticles obtained above in ferric chloride solution with a pH value of 2 at 1.0moL / L, heat in a water bath to 60°C for 30 minutes, and then wash the magnetic na...
Embodiment 2
[0046] Example 2 γ-Fe 2 o 3 Preparation of silicone oil-based magnetic liquid
[0047] 1. Preparation of magnetic nanoparticles
[0048] Weigh 11g of FeCl 3 ·6H 2 O and 9.7 g FeCl 2 4H 2 O, dissolved in 513mL deionized water, in a water bath at 45°C, stirred at 400r / min for 10min to make it uniform; weighed 17g of concentrated ammonia water, added dropwise to the mixed salt solution, kept heating, the reaction temperature was controlled at 40°C, and stirred After 40 minutes, it can be observed that the mixed solution changes rapidly from yellow to black. After the reaction is completed, magnetically separate magnetic nanoparticles to obtain magnetic nanoparticles, and wash them repeatedly with deionized water until the conductivity of the eluate is σ≤100μs / cm;
[0049] 2. Activation
[0050] Put the magnetic particles obtained above in a 1.0moL / L ferric chloride solution with a pH value of 2, heat in a water bath to 80°C for 30 minutes, and then wash the magnetic partic...
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