Green synthesis method of epoxy modified starch-based emulsion

Abstract

The invention relates to the field of new materials, and in particular discloses a green synthesis method of epoxy modified starch-based emulsion. The method comprises the following steps: (1) firstly, heating starch or starch derivatives in presence of a catalyst to obtain a gelatinized liquid; (2) diluting and dispersing the epoxy resin and a polymerized monomer in a certain ratio without using an organic solvent so as to obtain a uniformly dispersed mixed liquid of the epoxy resin and the polymerized monomer; (3) dropwise adding part of the polymerized monomer and an initiator into the gelatinized liquid at a certain temperature at the same time to prepare a core layer polymer; (4) continuing to dropwise add a polymerized monomer containing the epoxy resin and the initiator to prepare a shell layer polymer; (5) carrying out a heat preservation reaction to obtain the epoxy modified starch-based emulsion. The emulsion is not only environmentally-friendly, but also has a core-shell structure, and is prepared without using an organic solvent and an emulsifying agent; not only is the emulsion environmentally-friendly, but all properties of the emulsion, especially the chemical resistance and water resistance, are also obviously improved, so that the emulsion can be widely applied to the fields of papermaking, textile and water-based paint.

Description

technical field

[0001] The invention relates to the field of materials, in particular to a green synthesis method of epoxy-modified starch-based emulsion. Background technique

[0002] Starch is a natural biomacromolecule that is environmentally friendly and cheap. However, the properties of native starch solution are relatively unstable, with large molecular weight and easy retrogradation. These shortcomings limit the application of native starch in many fields. The properties of starch are changed through physical, chemical, biological and other ways, thereby adding some new functional properties, increasing the application range of starch, and broadening the application field of starch. Modified starch has a dispersion and stabilization effect in the emulsion polymerization process. The prepared emulsion has no emulsifier residue, fine particles, high stability and strong penetration, but its adhesion and water resistance are poor; epoxy resin has high cross-linking abili...

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