Classification of resin

    2019-09-24   reading

    Classification of resin

    There are two kinds of natural resin and synthetic resin according to the source of production.

    Natural resin: Natural resin has rosin, shellac, etc. It is rarely used in plastic products due to limited production. Synthetic resin: Synthetic resin is processed by using petroleum and coal as basic raw materials.

    Classification of resin_aluminium oxide flap disc_zirconia abrasive belt_flap wheel factory_grinding wheel

    aluminium oxide flap disc,zirconia abrasive belt,flap wheel factory,grinding wheel

    The synthetic resin substructure is classified into three types: a linear type, a branched type, and a bulk type (or a mesh type) depending on the form of bonding between carbon atoms in the molecule. Polystyrene (PS) is a linear type, low density polyethylene (LDPE) is a branched type, and phenolic resin (PF), unsaturated polyester resin (UP), and epoxy resin (EP) are bulk structures.

    aluminium oxide flap disc_zirconia abrasive belt_flap wheel factory_grinding wheel

    aluminium oxide flap disc,zirconia abrasive belt,flap wheel factory,grinding wheel

    According to the state when heated, it can be divided into thermoplastic resin and thermosetting resin. The thermoplastic resin refers to a resin whose molecular structure is linear or branched, has a certain fluidity or plasticity upon heating, is hardened again after cooling, and has no change in chemical composition, and this process can be repeated. Conventional thermoplastic resins such as polyethylene, polyvinyl chloride and polyamide have a long-term use temperature of generally lower than 100 ° C; and thermosetting resins have higher heat resistance than thermoplastic resins. The molecular structure of the thermosetting resin is a bulk type (or a mesh type). The thermosetting resin has a relatively low molecular weight before molding, and is a linear or branched molecule, and has solubility or fusibility. Upon molding, the molecules are crosslinked into a bulk structure and solidified due to various effects. This process is irreversible and becomes insoluble or infusible. Therefore, the cured thermosetting resin cannot be reworked, and a thermosetting resin such as a phenol resin or a high temperature resistant resin such as a silicone resin (which can be used at 200 to 300 ° C) can be used.


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