Preparation method of microcapsules for self-healing electrophoretic coatings

Abstract

The invention discloses a preparation method of microcapsules for self-healing electrophoretic coatings. A gelatin modified urea-formaldehyde resin is added as capsule walls, thereby improving the flexibility of the surfaces of the self-healing microcapsules, and the obtained microcapsules have the characteristics of high morphology, smooth surface, compact structure and higher strength. SiO2 is grafted onto the surfaces of the urea-formaldehyde resin capsule walls after the surface of the SiO2 is treated with a silane coupling agent, so that SiO2 layers formed on the surfaces of the microcapsules have high barrier property and strength, the occurrence of the microcapsule adhesion phenomenon is reduced, and the prepared microcapsules have high stability and are uniform in particle size distribution. In the microcapsules prepared with the method, an n-butyl glycidyl ether solvent is added into capsule cores, so that modified epoxy resin capsule cores are well diluted. According to the principle of siphon effect, an epoxy resin solution can fully permeate through damaged parts of a whole film along an aperture and undergo a crosslinking and curing reaction, thus achieving 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