Introduction to synthetic resin

Synthetic resin is a type of high molecular polymer synthesized by hand. It is a viscous liquid or a heat-softenable solid. It usually has a melting or softening temperature range when heated, and it can be plastically flowed under external force. Some properties are similar to those of natural resins. The most important application of synthetic resins is in the manufacture of plastics. In order to facilitate processing and improve performance, additives are often added, and sometimes used directly for forming, so it is often synonymous with plastic. Synthetic resins are also the basic raw materials for the manufacture of synthetic fibers, coatings, adhesives, and insulating materials. A wide variety of synthetic resins. According to the main chain structure, there are carbon chain, hetero chain and non-carbon chain synthetic resins; according to the synthetic reaction characteristics, there are polyaddition type and polycondensation type synthetic resin. In practical applications, thermoplastic resins and thermosetting resins are often classified according to their thermal behavior. The raw materials for the production of synthetic resins are abundant. In the early days, coal tar products and calcium carbide calcium carbide were the main products. Most of them are mainly oil and natural gas products such as ethylene, propylene, benzene, formaldehyde and urea. The production method of the synthetic resin employs bulk polymerization, suspension polymerization, emulsion polymerization, solution polymerization, melt polymerization, and interfacial polycondensation.