Method of preparing micron-level magnetic polymer micro-sphere by polarity seed swelling method

Abstract

The invention discloses a polar seed swelling method preparing for a micron-size magnetic polymer microballoon, which comprises the following steps: compounding the monodisperse polar seed by the means of high polymer polymerization; regarding the mixture of the polar double bonds carboxylate integral, the free radical initiator, the cross linking agent, the pore-creating agent as a preparing for the emulsion drop that organics adds to dissolving the dispersing stabilizor, the soluble salt, the inhibitor aqueous phase; mixing the seed with the emulsion drop; absorbing the organic facies in the seed microballoon by the water dispersing dielectric; getting the carboxylate polyaromatics microballoon by the thermal polymerization; getting the carboxy group polyaromatics microballoon in the condition of the alkali hydrolytic decomposition; adding to the mixed-ion solution containing the sufficient Fe2+ or Fe3; getting porous micron-size magnetic polymer microballoon by adding the strong aqua. The invention applies the polar polymer seed, which completes the swelling procedure in 24 hours, guarantees the homogeneity of the microballoon product; reduces the time.

Description

technical field [0001] The invention relates to a method for preparing micron-sized magnetic polymer microspheres by polar seed swelling method, in particular to a method for preparing micron-sized porous polymer microspheres by using polar seed swelling method and its direction towards porous polymer microspheres. The method of introducing magnetic particles internally, first prepares monodisperse polar particles, uses this particle as a seed particle, and uses its strong adsorption capacity to form an organic monomer containing a carboxyl group with a double bond or that can be converted into a carboxyl group. The material is swelled and prepared into micron-scale porous microsphere particles, and then the carboxyl groups on the microsphere particles are used to adsorb Fe 2+ / Fe 3+ The in-situ co-precipitation of mixed cations introduces magnetic particles to prepare magnetic polymer microspheres with uniform particle size, which belongs to the field of organic-inorganic co...

AI Technical Summary

Problems solved by technology

The disadvantage is that the requirements for polymers are relatively strict, and it is generally not suitable for those polymers that do not contain the above groups

[0014] The steps of the multi-step swelling method are too long, and new particles are inevitably generated during the swelling process; the kinetic swelling method takes a long time, reaching 80 hours; Ugelstad's active two-step swelling method, because it was prepared by soap-free emulsion polymerization The monodisperse polystyrene microspheres are used as seed particles, and the prepared seed particle size is very small. To prepare the final product with large particle size, it must have a large swelling multiple. It takes two steps. First, the solubility in water is less than 0.001g / ml active swelling agent is used to swell the seed particles, and due to the limitation of the solubility of this active swelling agent in water, it is necessary to add acetone auxiliary reagents to introduce the active swelling agent into the seed particles. Acetone needs to be removed before, otherwise it will interfere with the polymerization reaction. This method has many steps, takes a long time, requires special equipment, and the swelling is very complicated and difficult.