Preparation method of pomegranate-shaped organic-inorganic nano-composite microspheres

A technology of inorganic nanometer and composite microspheres, applied in the field of water-based composite latex, can solve the problems of undiscovered pomegranate-shaped composite microspheres, difficult removal of co-emulsifier, high energy consumption, etc.

Active Publication Date: 2013-12-25
杭州华利实业集团有限公司
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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

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  • Preparation method of pomegranate-shaped organic-inorganic nano-composite microspheres
  • Preparation method of pomegranate-shaped organic-inorganic nano-composite microspheres
  • Preparation method of pomegranate-shaped organic-inorganic nano-composite microspheres

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Embodiment 1

[0059] The transmission electron micrograph of the pomegranate-shaped organic-inorganic nanocomposite microspheres made in embodiment 1 is as follows: Figure 4 shown. The hard monomer is used as the reactant completely in the system, which is for the convenience of observing the morphology of the polymerized product. In the obtained composite microspheres, silica has been successfully encapsulated in latex particles, and no free silica was observed in the water phase, indicating that the composite microspheres have a typical pomegranate-like morphological structure, and the silica encapsulation rate is high.

Embodiment 10

[0060] The transmission electron micrograph of the pomegranate-shaped organic-inorganic nanocomposite microspheres made in embodiment 10 is as follows: Figure 5 as shown, Figure 5 Partial magnification of the transmission electron microscope photo within the dotted line box at the specified position in Figure 6 shown.

[0061] Composite microspheres with lower glass transition temperature (about 30°C, close to room temperature) were obtained by copolymerization of BA and MMA with equal weight of soft and hard monomers. The high-energy electron beam bombardment used in TEM observations softens and fuses the colloidal particles. Therefore, complete and independent single composite microspheres can no longer be observed in the transmission electron microscope photographs, but a large number of spherical clusters containing multiple silicon dioxide can be observed. This is the same as Figure 4 The morphological structure of the composite microspheres in the composite micros...

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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...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F220/14C08F212/08C08F220/18C08F2/26C08F2/30
Inventor 戚栋明赵晓丽陈智杰
Owner 杭州华利实业集团有限公司
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