A kind of preparation method of pomegranate-shaped organic-inorganic nanocomposite microspheres

Abstract

The invention discloses a preparation method of pomegranate-shaped organic-inorganic nano-composite microspheres, which comprises the following steps: mixing an aqueous dispersion solution of silicon dioxide modified by proper amount of double-bond silane coupling agent in a coupling method with a phenylpropyl monomer, anionic emulsifier, non-anionic emulsifier and water, and stirring simply, so that a milky emulsified liquid is obtained; adding initiator to perform emulsion polymerization in the presence of silicon dioxide, so that the pomegranate-shaped organic-inorganic nano-composite microspheres with multiple silicon dioxide particles wrapped in phenylpropyl emulsion particles are obtained finally and are stably dispersed in the emulsified liquid. The preparation method has the advantages that the sources of the raw materials are extensive, the raw materials are easy to obtain, the preparation process is simple, and moreover, in the prepared pomegranate-shaped organic-inorganic nano-composite microspheres, the wrapping rate of silicon dioxide is high, the structure is neat and the placement stability is good. The adhesion property and the film forming performance of the composite microsphere particles are adjustable, the adhesive force and the transparency of the corresponding glue film are good, and the organic-inorganic nano-composite microspheres can be applied to the fields of coating, textile, rubber, plastics, biology, medicine and the like.

Description

technical field [0001] The invention relates to the field of water-based composite latex, in particular to a method for preparing pomegranate-shaped organic-inorganic nano composite microspheres. Background technique [0002] Inorganic nanoparticles such as nano-silica have many excellent functions, and have been widely used in coatings, textiles, rubber, plastics, biology, medicine and other fields. However, inorganic nanoparticles have strong hydrophilicity and poor compatibility with organic substances, so they are prone to agglomeration in the actual application process, which seriously affects the full play of various functions of nanoparticles. Pre-wrapping multiple inorganic nanoparticles in polymer latex particles to make submicron-sized pomegranate-like nanocomposite microspheres can help solve the above-mentioned problems of easy aggregation and difficulty in dispersing. In addition, by removing the internal inorganic template by hydrofluoric acid etching, a hollo...

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Problems solved by technology

However, the currently used miniemulsion polymerization often has the following defects: (1) The inorganic particles must be subjected to strict lipophilic modification in advance, so that the inorganic particles must be preferentially distributed in the monomer phase in the oil-water two-phase, and be uniform and stable in it. Disperse the degree of lipophilicity; (2) It is necessary to use a strong homogenization process to finely emulsify the monomer droplets. The migration of monomers in the droplets to the water phase and subsequent homogeneous and micelle nucleation in the water phase, and these small molecule co-emulsifiers that will eventually stabilize in the polymer latex particles are extremely difficult to remove, which will seriously affect the quality of the final product

But so far, no report has been found on the preparation of pomegranate-like composite microspheres that encapsulate many small-sized inorganic particles in polymer colloids by emulsion polymerization.

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