According to the performance after heating 1. Thermoset […]
According to the performance after heating
1. Thermosetting plastic
This type of plastic is characterized by being cured at a certain temperature after a certain period of heating or adding a curing agent.
The cured plastic has a hard texture and is insoluble in any solvents. It cannot be softened again by heating. Decomposition occurs when the heating temperature is too high. Common thermosetting plastics are: bakelite, electric jade, decorative boards and unsaturated polyester plastics.
This type of plastic is characterized by being softened by heat, and hardened by cooling. Generally, there is only physical change during processing to maintain its chemical nature. The resins of this type of plastic are mostly made by addition polymerization. Common thermoplastics are: nitrocellulose plastics, acetate plastics, polyethylene plastics, polypropylene plastics, polystyrene plastics, and polyvinyl chloride plastics. For example, our common mineral water bottles, plastic bags, etc.
By application range
1. General Plastic
This type of plastic mainly refers to a type of plastic with large output, wide use, and low price. They account for about 80% of total plastic production. The main varieties are: polyethylene, polyvinyl chloride, polypropylene, polystyrene, phenolic and amino plastics.
2. Engineering Plastics
Generally refers to plastics that can be used as structural materials in engineering technology. The remarkable characteristics of this type of plastic are high mechanical strength, strong chemical resistance and high temperature resistance, which can replace metal or do other special applications. The main varieties are: polyamide, polycarbonate, polyoxymethylene, polysulfone, ABS, polyphenylene ether, fluoroplastic, etc.
Divided by flammability
1. Flammable plastic
This kind of plastic burns violently after being exposed to an open flame and is not easy to extinguish. Such as nitrocellulose plastics, etc., such plastics are classified as dangerous goods.
2. Flammable plastic
Such plastics burn when exposed to open flames and are not self-extinguishing, but they burn faster. Such as polyethylene, polypropylene and so on.
3． Flame retardant plastic
This type of plastic burns in strong open flames and extinguishes quickly after leaving the fire. Such as phenolic plastics, acetate plastics, polyvinyl chloride plastics, etc.