A brief history of the development of insulating materials
Insulation material is the foundation and guarantee for the development of electrical products. It plays a very important role in the development of electrical and electrical industry. The development and progress of insulation materials depend on the development of polymer materials and directly restrict and influence the development and progress of electrical products. Insulation material is the key to electrical products with advanced technology, and is also an important guarantee for long-term safe and reliable operation of electrical products. Therefore, it is necessary to develop new varieties of insulation materials, improve product performance and quality, so as to meet the needs of continuous development of electrical products.
Before twentieth Century, insulating materials were basically derived from natural materials or their products. The earliest motors were made of silk, cotton yarn and cotton cloth as insulating materials. In order to improve water resistance, natural resins, such as shellac, are used to impregnate vegetable oils and bitumen. In the early twentieth Century, due to the development of organic synthesis and polymer chemistry, the first synthetic polymer, phenolic resin, was produced by human beings. It was also an important invention in the field of insulating materials.
Since 30s, polyvinyl chloride, polyethylene, polytetrafluoroethylene, chloroprene rubber, polyvinyl acetal and so on have been developed. After 1950s, the industrial production of silicone resin, polyester film, unsaturated polyester resin, epoxy resin and so on, and the industrial production of glass fiber and mica products, promoted the development of insulation materials. In 1970s, while the polymer industry was further developing to large-scale industrialization, the insulating material industry began to appear new F class and H insulation material system, and developed polyimide, polyimide, polyimide, polymaleimide, polyphenylene ether and other heat-resistant insulating lacquers, adhesives and thinning of polyimide, polyimide, and polyphenylene ether. Membrane, and modified epoxy, unsaturated polyester, aromatic polyamide fiber paper and its composite materials and other new products.
Modern application of nanotechnology develops nano insulating materials. Nanotechnology can be applied to many fields, including insulation materials. The application of nanomaterials will open up new prospects for new materials and technologies for many traditional insulation materials which can not achieve new properties.