Preparation method of strawberry-shaped organic-inorganic nanometer composite microsphere

Abstract

The invention discloses a preparation method of a strawberry-shaped organic-inorganic nanometer composite microsphere. The preparation method comprises the following steps: 1, adding a silica colloid to a styrene acrylate copolymer latex drop by drop under stirring, and adding an acid drop by drop to adjust the pH value of the obtained material to 4.5-5.7 to form a blending system; 2, heating theblending system to 60-100DEG C under stirring, and continuously stirring for 0.5-3.0h under the shearing effect to obtain an organic-inorganic nanometer composite latex system; 3, cooling the organic-inorganic nanometer composite latex system, and adding an alkali drop by drop to adjust the pH value of the latex system to 10-12 to obtain the firmly-combined stably-dispersed strawberry-shaped organic-inorganic nanometer composite microsphere with the surface embedded with small silica particles. The preparation method has the advantages of wide resource and easy availableness of raw materials,simple preparation technology, good latex particle controllability, and wide adjustable range of the particle size of the composite microsphere. The strawberry-shaped organic-inorganic nanometer composite microsphere prepared with the method, which has the advantages of high composite degree, good structure firmness and stable placement, can be applied to the fields of coatings, rubbers, plastics, the biology and the like.

Description

technical field [0001] The invention relates to the field of nanocomposite materials, in particular to a method for preparing strawberry-shaped organic-inorganic nanocomposite microspheres. Background technique [0002] Organic-inorganic nanocomposite microspheres are widely used in coatings, rubber, plastics, biology and other fields. Currently, the commonly used preparation methods of organic-inorganic nanocomposite microspheres mainly include in-situ polymerization and physical composite methods. [0003] The in-situ polymerization method mainly relies on the forces such as electrostatic adsorption, acid-base complexation, and chemical bonding between the organic-inorganic two phases, and the two are relatively tightly combined through the in-situ polymerization of monomers on the surface of inorganic particles. For example, the Chinese patent application with publication number CN 1587291A discloses a preparation method of strawberry-type organic-inorganic nanocomposite...

AI Technical Summary

Problems solved by technology

However, the Pickering emulsification effect is essentially a physical composite effect with the characteristics of dynamic adsorption equilibrium. The adsorption stability and adsorption capacity in the equilibrium state are related to particle wettability, hydrophilicity, shape, surface electrical properties and particle size. The size ratio, concentration ratio and other factors are all related, so it is very easy to be affected by environmental factors such as system pH, salt concentration, and dispersed phase concentration, resulting in large-scale desorption behavior

This limitation prevents the conventional Pickering method from producing stable, firm, and highly efficient organic-inorganic composite microspheres

Images