5 / 2022-02-17 16:42:30

Study on Microcapsules for Self-healing System of Silicone Rubber Insulating Material

microcapsule,self-healing,insulating material,silicone rubber

Silicone rubber is one of the commonly used insulating materials in the field of outdoor insulation. In adverse conditions (such as ultraviolet, corona discharge, and thermal oxygen), silicone rubber materials are very susceptible to aging and its service life is not long enough. Cracking and microcracks are common phenomena in the aging process of silicone rubber insulating materials. Microcapsule self-healing technology is commonly used for extrinsic self-healing polymer materials, and provides the possibility to repair microcracks of silicone rubber and prolong the service life of silicone rubber. In this paper, microcapsules that poly (urea-formaldehyde) (PUF) as shell and methyl hydrogen siloxane (hydrogen silicone oil) as core was successfully prepared by in-situ polymerization. The effect of emulsifiers on the preparation process of microcapsules was studied. The basic properties of microcapsules were tested by scanning electron microscopy (SEM), infrared spectroscopy and thermogravimetric analysis (TG). The results show that the combination of poly (ethylene-alt-maleic anhydride) (EMA) / polyvinyl alcohol (PVA) was most suitable for the preparation of PUF microcapsules. The coating of hydrogen silicone oil repairing agent by PUF was successfully realized. Microcapsules have excellent thermal stability and have the potential as a material for self-healing system of silicone rubber insulating material.