2022.11.19
1. Thermoplastic material
It softens and even flows when heated, and hardens when cooled. This process is reversible and can be repeated. Polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, acrylic plastic, other polyolefins and their copolymers, polysulfide, polyphenylene ether, chlorinated polyether, etc. It is a thermoplastic material. The resin molecular chains in thermoplastic materials are all linear or branched structures. There is no chemical bond between the molecular chains, and they soften and move when heated. The process of cooling and hardening is a physical change.
2. Thermosetting material
It can soften and move when it is heated for the first time. When it is heated to a certain temperature, it will undergo a chemical reaction and become hardened by cross-linking. This change is irreversible. After that, when it is heated again, it can no longer become soft and move. It is based on this characteristic for molding processing, using the plasticizing action during the first heating, filling the cavity under pressure, and then solidifying into a product of a certain shape and size. This material is called a thermosetting plastic.
The resin of thermosetting plastics is linear or branched before curing. After curing, chemical bonds are formed between molecular chains to form a three-dimensional network structure. Not only can it not be melted again, but it cannot be dissolved in solvents. Phenolic, aldehyde, melamine formaldehyde, epoxy, unsaturated polyester, silicone and other plastics are all thermosetting plastics.
Mainly used for heat insulation, wear resistance, insulation, high voltage resistance and other plastics used in harsh environments, most of them are thermosetting plastics, and the commonly used ones should be frying pan handles and high and low voltage electrical appliances.
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