A preparation method of microcapsules for self-healing electrophoretic coating

Abstract

The invention discloses a method for preparing microcapsules for self-healing electrophoretic coatings. In the invention, gelatin-modified urea-formaldehyde resin is added as the capsule wall to improve the flexibility of the surface of the self-healing microcapsules, and the obtained microcapsules have good shape, The surface is smooth, the structure is dense, and it has high strength; in the present invention, SiO is treated with silane coupling agent 2 After the surface is grafted to the surface of the urea-formaldehyde resin capsule wall, the SiO formed on the surface of the microcapsules 2 layer, has good barrier properties and strength, thereby reducing the occurrence of microcapsule adhesion, and the prepared microcapsules have good stability and uniform particle size distribution; for the microcapsules prepared by the method of the present invention, n-butylene is added to the capsule core Based on glycidyl ether solvent, it has a good dilution effect on the modified epoxy resin capsule core. Using the principle of siphon effect, the epoxy resin solution can completely penetrate into the damaged part of the entire coating film along the gap, and a crosslinking and curing reaction occurs. So as to achieve a self-healing effect.

Description

technical field [0001] The invention belongs to the technical field of paint preparation, and in particular relates to a preparation method of microcapsules for self-healing electrophoretic paint. Background technique [0002] Cathodic electrophoretic coating is a kind of anti-corrosion coating developed in the mid-1970s. Compared with anodic electrophoretic coating, it has better performance in terms of throwing power and corrosion resistance, and has been applied industrially. During the production or use of the workpiece, problems such as bumps and scratches inevitably occur, which greatly reduces the protective function of the paint and affects the overall anti-corrosion performance of the paint film. Therefore, it is necessary to increase the self-healing ability of the paint film. [0003] In recent years, the application of microcapsules in self-healing materials has become a research hotspot. The advantage of microcapsule technology is that the capsule core can be w...

AI Technical Summary

Problems solved by technology

However, in the process of in-situ polymerization, the viscosity of the emulsion is too high, which causes the adhesion between the microcapsules, and the surface of the microcapsules is damaged, resulting in problems such as rough surface of the microcapsules, poor stability, and uneven particle size distribution; The capsule core in the capsule has a high viscosity during the repair process, which is not conducive to the occurrence of capillary siphon effect, so that the self-healing effect cannot be achieved