Resin generally refers to a range of softening or melting after being heated. When softened, it has a tendency to flow under the action of external forces. At room temperature, it is solid, semi-solid, or sometimes liquid organic polymer.
There are many types of resins, which can be divided into natural resins and synthetic resins according to source classification. Natural resin refers to the amorphous organic substances obtained from animal and plant secretions in nature, such as amber and shellac. Synthetic resin refers to resin products obtained by chemical synthesis of simple organic substances or chemical reactions of certain natural products, such as phenolic resin, polyvinyl chloride resin, etc., where synthetic resin is the main component of plastic.
Phenolic resin is a kind of synthetic resin made by polycondensation of phenolic compounds and aldehyde compounds, because of its high mechanical strength, good heat resistance, flame retardant, low toxicity, low smoke, etc. , Can be blended with other polymers to achieve high performance, widely used in civil, industrial, aerospace and other fields.
One of the common applications of synthetic resins is the manufacture of plastics. In order to facilitate processing and improve performance, additives are often added, and sometimes used directly for processing and forming, so they are often synonymous with plastic. Synthetic resins are also the basic raw materials for manufacturing synthetic fibers, paints, adhesives, insulating materials, etc. Synthetic resins also have a broad market in the packaging and building supplies industries; electronics, electrical appliances, and automobiles are also important applications of synthetic resins. In addition, there are furniture, toys, entertainment products, household appliances, and medical supplies. Nowadays, synthetic resins also play an important role in the field of rail transit. The Chongqing Rail Transit Line Chaotianmen Yangtze River Bridge achieves short-rail access. This is a new breakthrough in the application of synthetic resin to the subway system. Each sleeper has a unique "identity code" ", The production and construction technology of its materials have extremely high requirements.