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With China Plastic Machinery
With China Plastic Machinery
Plastic molds are molds used for plastic molding. According to the molding principle, they can be divided into injection molds, compression molds, and transfer molds.
Thermoplastic plastics refer to plastics that can soften to melt and flow within a certain temperature range and then solidify into a certain shape after cooling. This process can be repeated many times.
(1) Essence (structure): linear polymer compounds with branched chains.
(2) Advantages: good physical and mechanical properties, easy to mold.
(3) Disadvantages: generally poor heat resistance and rigidity (except for a few products).
(4) Typical varieties: PE polyethylene; PP polypropylene; PS polystyrene.
Thermosetting plastic refers to resin that undergoes chemical reactions during heating, changing from linear polymers to three-dimensional polymer structures. After that, it will no longer melt when heated, nor will it dissolve in organic solvents. If the heating temperature is too high, it can only carbonize.
(1) Essence (structure): Resin is a multi-functional macromolecule.
(2) Advantages: high heat resistance, good dimensional stability, and low price.
(3) Disadvantages: poor mechanical properties and need to be enhanced.
(4) Typical varieties: PF phenolic formaldehyde, UF urea formaldehyde; MF melamine-formaldehyde.
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